HomeMy WebLinkAboutCOA Design Stds - Jan 2022Issued January 2022 City of Auburn
Engineering Design Standards Page 1
ENGINEERING
DESIGN STANDARDS
January 18, 2022
City of Auburn
Community Development & Public Works Departments
25 West Main Street
Auburn, WA 98001-4998
Approved By:
______________________________________________ __________
Jacob Sweeting, P.E. Date
Assistant Director of Engineering Services/City Engineer
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TABLE OF CONTENTS
1 General Information.................................................................................................................11
1.00 Preface ............................................................................................................11
1.01 Definitions.......................................................................................................11
1.02 Contact Information........................................................................................18
1.03 City Reference Material...................................................................................18
1.03.01 City of Auburn Surface Water Management Manual (SWMM) ......................19
1.03.02 City of Auburn Engineering Construction Standards Manual..........................19
1.03.03 Planning Documents........................................................................................19
1.03.04 Informational Handouts..................................................................................19
1.03.05 Additional Technical Information....................................................................20
1.03.06 Other Reference Material ...............................................................................20
1.04 Deviation from Standards ...............................................................................20
1.04.01 General Deviations..........................................................................................21
1.04.02 Surface Water Management Manual (SWMM) Deviations.............................22
1.05 Appeal of City Engineer’s Decision..................................................................22
1.06 Changes to Standards......................................................................................22
1.07 Downtown Sidewalk Design Guidelines..........................................................23
1.07.01 Applicability.....................................................................................................23
2 Plan Approval Process.....................................................................................................30
2.00 Preface ............................................................................................................30
2.01 Types of Plans..................................................................................................30
2.01.01 Grading Plans...................................................................................................30
2.01.02 Building Site Plans...........................................................................................30
2.01.03 Public Facility Extension (FAC) Plans...............................................................30
2.01.04 Other Plans.....................................................................................................30
2.02 Review and Approval Process .........................................................................31
2.02.01 Submittals........................................................................................................31
2.02.02 City Review......................................................................................................32
2.02.03 Plan Approval ..................................................................................................33
2.02.04 Construction Plan Revision..............................................................................33
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2.02.05 Project Close Out.............................................................................................33
3 Plan Preparation Requirements......................................................................................35
3.00 Preface ............................................................................................................35
3.01 General Requirements ....................................................................................35
3.02 Plan Format.....................................................................................................35
3.03 General Plan Requirements ............................................................................37
3.03.01 Standard Plan Format......................................................................................37
3.03.02 Drafting Standards...........................................................................................37
3.04 Plan Sheet Elements........................................................................................38
3.04.01 Cover Sheet .....................................................................................................38
3.04.02 Temporary Erosion and Sediment Control (TESC) Plan Sheet.........................39
3.04.03 Grading and Private Storm Drainage Plan Sheet.............................................40
3.04.04 Cross-Section Sheet.........................................................................................41
3.04.05 Detail Sheet.....................................................................................................42
3.04.06 Utility Plan Sheets............................................................................................43
3.04.08 Utility Profile Sheet..........................................................................................46
3.04.09 Public Street Plan and Profile Sheet................................................................47
3.04.10 Site and Landscape Plan Sheet........................................................................54
3.04.11 Site Irrigation Plan sheet .................................................................................55
3.04.12 Critical Area Restoration/Mitigation...............................................................55
3.04.13 Phasing Plans...................................................................................................55
Appendix A – Approval Blocks ............................................................................................57
Appendix B – Standard Notes.............................................................................................58
Appendix C – Deviations.....................................................................................................64
Appendix D – Survey Standards..........................................................................................65
Appendix D – Survey Standards (continued) ......................................................................66
Appendix E – Minor Grading Permit Criteria ......................................................................67
Appendix F – AutoCAD Layers Standards............................................................................68
Appendix F – AutoCAD Layers Standards (continued)........................................................69
4 Report Preparation Requirements..................................................................................70
4.00 Preface 70
4.01 General Requirements ....................................................................................70
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4.02 Report Types and Requirements.....................................................................70
4.02.01 Geotechnical Reports......................................................................................70
4.02.02 Stormwater Site Plan Report...........................................................................71
4.02.03 Critical Area Report.........................................................................................71
4.02.04 Traffic Impact Analysis.....................................................................................72
4.02.05 Construction Stormwater Pollution Prevention Plan (SWPPP) .......................72
4.02.06 Other Reports..................................................................................................72
5 TESC, Clearing and Grading.............................................................................................73
5.00 Preface 73
5.01 TESC Design Criteria.......................................................................................................73
5.01.01 Temporary Erosion and Sediment Control (TESC)...........................................73
5.01.02 Temporary Sedimentation Systems ................................................................73
5.01.03 Construction SWPPP........................................................................................73
5.02 Land Clearing...................................................................................................73
5.03 Grading ……………………………………………………………………………………………………………………73
5.03.01 Purpose............................................................................................................73
5.03.02 Excavations......................................................................................................74
5.03.03 Fills...................................................................................................................74
5.04 Retaining Walls ..............................................................................................................75
5.04.01 Underdrains.....................................................................................................75
5.04.02 Rock Walls .......................................................................................................76
5.04.03 Block Retaining Walls ......................................................................................76
5.04.04 Reinforced Concrete Walls..............................................................................76
5.04.05 Mechanically Stabilized Earth Walls (MSE Walls)............................................76
5.05 Construction Sequence..................................................................................................77
5.05.01 Requirements..................................................................................................77
6 City Utilities Requirements .............................................................................................78
6.00 Preface 78
6.01 Easements......................................................................................................................78
6.01.01 Easement Width..............................................................................................78
6.01.02 Easement Form ...............................................................................................79
6.01.03 Location of Facilities within Easement............................................................79
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6.01.04 Easements for Privately Owned Utilities.........................................................80
6.02 Utility Pipe Separation...................................................................................................80
6.03 Utility Access Roads.......................................................................................................82
6.03.01 Road Design Requirements.............................................................................82
7 Water Facilities................................................................................................................85
7.00 Preface ............................................................................................................85
7.01 Water Mains and Appurtenances ...................................................................85
7.01.01 Water Main Sizing ...........................................................................................85
7.01.02 Water Main Location.......................................................................................86
7.01.03 Water Main Fittings.........................................................................................87
7.02 Water Services ................................................................................................88
7.02.01 Domestic Services............................................................................................88
7.02.02 Other Services .................................................................................................89
7.03 Water Valves...................................................................................................90
7.03.01 Water Valve Sizing .................................................................................................90
7.03.02 Water Valve Location.............................................................................................90
7.04 Cross Connection Control................................................................................90
7.04.01 Domestic Services..................................................................................................91
7.04.02 Irrigation Services............................................................................................91
7.04.03 Fire Line Connections......................................................................................91
7.04.04 General............................................................................................................91
7.05 Pressure Reducing Stations.............................................................................92
7.06 Fire Systems ....................................................................................................92
7.06.01 Fire Hydrant Assemblies..................................................................................92
7.06.02 Fire Sprinkler Systems .....................................................................................93
7.06.03 Fire Flows.........................................................................................................94
7.06.04 Fire Authority and Hydrant Access..................................................................95
8 Sanitary Sewer and Storm Drainage Facilities.................................................................97
8.00 Preface 97
8.01 Sanitary Sewer and Storm Drainage Mains.....................................................98
8.01.01 Main Sizing/Slope............................................................................................98
8.01.02 Main Location ........................................................................................................99
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8.01.03 Sanitary Sewer and Storm Drainage Pipe Material Requirements................100
8.02 Sanitary Sewer and Storm Drainage Structures............................................101
8.02.01 Structure Type and Size.................................................................................101
8.02.02 Manhole and Catch Basin Locations..............................................................103
8.02.03 Manhole Parameters.....................................................................................103
8.03 Sanitary Side Sewers .....................................................................................104
8.04 Oil/Water Separators....................................................................................106
8.05 Pressurized Sewer Systems...........................................................................107
8.06 Sanitary Sewer Meters..................................................................................107
8.07 Storm Drainage System Requirements .........................................................107
9 Facilities in the Right of Way.........................................................................................112
9.0 Preface ..........................................................................................................112
9.01 Franchise/Public Way Agreement Requirement...........................................112
9.02 Construction Permit Requirement................................................................112
9.03 Underground Facilities..................................................................................112
9.03.01 Design Criteria...............................................................................................112
9.03.02 Perpendicular Asphalt Trenching and Restoration Requirements................113
9.03.03 Longitudinal Trenching in Asphalt Pavement................................................114
9.03.04 Trenching in Cement Concrete Pavement.....................................................115
9.03.05 Trenching in Other Right-of-Way Surfaces....................................................115
9.04 Aboveground Facilities..................................................................................115
9.05 Building and Structure Related Facilities.......................................................116
9.06 Small Wireless Facilities ................................................................................116
9.06.01 General Requirements.........................................................................................116
9.06.02 Attachments to City Facilities........................................................................117
9.06.03 General Pole Requirements...........................................................................118
9.06.04 Wiring and Conduit........................................................................................118
9.06.05 Concealment .................................................................................................118
9.06.06 Pole Mounted Antennas and Equipment......................................................119
9.06.07 Non-Pole Mounted Equipment .....................................................................119
9.06.08 Strand Mounted Small Wireless Facilities.....................................................119
10 Streets...........................................................................................................................120
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10.00 Required Public Street Improvements.........................................................120
10.00.01 Half-Street Improvements............................................................................120
10.00.02 Additional Improvements.............................................................................121
10.01 Street Classification and Street Layout .........................................................121
10.01.01 Arterials.........................................................................................................122
10.01.02 Collectors.......................................................................................................125
10.01.03 Local Streets..................................................................................................127
10.01.04 Alleys ............................................................................................................133
10.01.05 Private Street.................................................................................................135
10.01.06 Cul-de-sacs....................................................................................................136
10.02 Street Geometry............................................................................................136
10.02.01 Horizontal Curves..........................................................................................136
10.02.02 Reverse Curves..............................................................................................137
10.02.03 Superelevations.............................................................................................137
10.02.04 Vertical Grades..............................................................................................137
10.02.05 Vertical Curves...............................................................................................137
10.02.06 Cross Slopes...................................................................................................137
10.02.07 Posted and Design Speed..............................................................................138
10.02.08 Right of Way..................................................................................................138
10.02.09 Sight Distance................................................................................................138
10.03 Roadway Width (Travel Way)........................................................................139
10.03.01 Inside Through Lanes and Curb Lanes...........................................................139
10.03.02 Center Turn Lanes .........................................................................................139
10.03.03 Other Lanes...................................................................................................139
10.03.04 Road Edge......................................................................................................140
10.03.05 On-Street Parking..........................................................................................140
10.04 Roadway Intersections..................................................................................141
10.04.01 Intersection Spacing......................................................................................141
10.04.02 Horizontal Approach Angle............................................................................142
10.04.03 Intersection Approach Offsets.......................................................................142
10.04.04 Curb and Right-of-Way Radius ......................................................................142
10.04.05 Landing Approach..........................................................................................142
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10.04.01 Intersection Control ......................................................................................143
10.05 Driveways......................................................................................................143
10.05.01 Driveway Classifications................................................................................143
10.05.02 Driveway Locations........................................................................................144
10.05.03 Driveway Lay Out...........................................................................................147
10.05.04 Driveway Alignment (Horizontal and Vertical)..............................................148
10.05.05 Driveway Widths ...........................................................................................148
10.05.06 Restricted Access Driveways .........................................................................148
10.05.07 Private Access Roads on Access Tracts or Easements (Shared Driveways)...149
10.06 Sidewalks.......................................................................................................150
10.06.01 Sidewalk Widths............................................................................................150
10.06.02 Meandering Sidewalks ..................................................................................150
10.06.03 Accessibility...................................................................................................151
10.06.04 Downtown Sidewalks....................................................................................151
10.06.05 Curb Ramps ...................................................................................................152
10.06.06 Downtown Street Corners.............................................................................153
10.07 Bikeways........................................................................................................154
10.07.01 Class I Bikeway...............................................................................................155
10.07.02 Class II Bikeway..............................................................................................155
10.07.03 Class III Bikeway.............................................................................................155
10.07.04 Class IV Bikeway ............................................................................................155
10.07.05 Bikeways at Railroad Crossings......................................................................156
10.07.06 Bikeways at Roundabouts.............................................................................156
10.07.07 Bikeways at Signalized Intersections.............................................................156
10.07.08 Bikeways at Un-signalized Intersections .......................................................156
10.07.09 Bikeway Pavement Markings, Signing, and Striping......................................156
10.08 Pavement Design...........................................................................................156
10.08.01 Simplified Pavement Design..........................................................................157
10.08.02 AASHTO Pavement Design ............................................................................158
10.08.03 Pavement Design Report...............................................................................159
10.08.04 Permeable Pavements for Roads, Access Tracts, and Shared Driveways.....159
10.08.05 Pavement Surface Restoration and Preservation..........................................160
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10.09 Street Landscaping........................................................................................160
10.09.01 Landscape Strips............................................................................................160
10.09.02 Street Trees...................................................................................................161
10.09.03 Ground Cover Planting..................................................................................165
10.09.04 Planting Methods and Maintenance.............................................................166
10.09.05 Establishment Period.....................................................................................166
10.09.06 Irrigation Systems..........................................................................................166
10.10 Mailboxes......................................................................................................167
10.10.01 Mailbox Locations..........................................................................................167
10.10.02 Mailbox Installation.......................................................................................167
10.11 Illumination...................................................................................................167
10.11.01 General..........................................................................................................167
10.11.02 Design............................................................................................................167
10.11.03 Lighting Design Schedule...............................................................................168
10.11.04 Luminaries.....................................................................................................168
10.11.05 Light Standards..............................................................................................169
10.11.06 Light Standards Foundations........................................................................169
10.11.07 Service Cabinet, Foundation, Conduit...........................................................169
10.11.08 Junction Boxes...............................................................................................169
10.12 Survey Monuments....................................................................................................170
10.13 Guardrail....................................................................................................................170
10.14 Bollards......................................................................................................................170
10.15 Bus Transit Facilities...................................................................................................170
10.15.01 Bus Stops Locations.......................................................................................171
10.15.02 Bus Stops Features........................................................................................171
10.15.03 Bus Pullout Lanes...........................................................................................172
10.16 Traffic Control Devices...............................................................................................172
10.16.01 Median Islands ..............................................................................................172
10.16.02 Mountable Curbs...........................................................................................173
10.16.03 “Pork Chop” Islands.......................................................................................173
10.16.04 Signage ..........................................................................................................173
10.16.05 Crosswalks.....................................................................................................173
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10.16.06 Left and Right Turn Lane Channelization.......................................................175
10.16.07 Lane Division..................................................................................................176
10.16.08 Painted Islands ..............................................................................................176
10.16.09 Two-way Left-turn Lanes...............................................................................176
10.16.10 Other Pavement Markings ............................................................................176
10.16.11 Construction Area Temporary Traffic Control..............................................176
10.16.12 Roadway Barricades......................................................................................177
10.16.13 Traffic Signals.................................................................................................177
10.16.14 Traffic Calming...............................................................................................178
10.17 Traffic Impact Analysis ..................................................................................178
10.17.01 When Traffic Impact Analyses are Required .................................................178
10.17.02 Elements of a Traffic Impact Analysis............................................................179
10.17.03 Special Uses...................................................................................................179
10.17.04 Mitigation Identification................................................................................179
10.17.05 Recommendations.........................................................................................180
10.17.06 Area Circulation Plan.....................................................................................180
10.18 Clear Zone – Lateral Separation....................................................................181
11 City Telecommunication Utility.....................................................................................183
11.00 Preface ..........................................................................................................183
11.01 Design Criteria...............................................................................................183
11.01.01 Conduits........................................................................................................183
11.01.02 Splice Vaults and Pull Boxes .........................................................................183
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1 General Information
1.00 Preface
The City of Auburn has adopted this Engineering Design Standards manual to require the
standardization of design elements for consistency and to assure that public safety needs are
met. This manual contains engineering standards for use by professional civil engineers when
designing facilities within the City of Auburn. The information contained in this manual cannot
provide for all situations and conditions that may be encountered. Specific provisions contained
within this manual may not be appropriate for all locations and existing conditions. These
standards are intended to assist, but not substitute for, competent work by professional civil
engineers.
The design requirements contained within this manual do not set legal standards of care, but
provide guidance for possible engineering treatment under some circumstances.
Compliance with these standards does not alleviate the design engineer from using sound
professional engineering practices and meeting the requirements of the specific utility in
question. The design criteria contained herein are the minimum acceptable under standard
conditions. Special conditions may require more stringent requirements that will be addressed
during the plan review process.
This chapter contains general information on this manual and the City of Auburn.
1.01 Definitions
Note that additional definitions are included in the documents referenced in Section 1.03.
AASHTO – American Association of State Highway and Transportation Officials.
Access Point – A driveway or private street that connects to the general public street system.
A public street is not considered an access point.
ACP – Asphalt Concrete Pavement.
Activity Centers – Locations such as schools, parks, retail areas and shopping centers, places
of employment, or public service areas that attract people.
Accessible – Meeting Americans with Disabilities Act (ADA) requirements as established by
the City’s ADA Transition Plan.
ADT – Average Daily Traffic. The total two-directional volume of traffic passing through a given
point during a given time period, divided by the number of days in that time period.
Aggregate – A mixture of various soil components (e.g. sand, gravel, and silt).
Alley – Right-of-way, usually narrower than a street with an all-weather surface, which provides
access to the rear boundary of 2 or more residential or non-residential properties and is not
intended for general traffic circulation. An alley is considered to be a classification of
roadway/street.
Applicant – The owner or their agent seeking approval from the city for any land use or other
related permit or approval referenced in City of Auburn Code and which requires utilization of
these Standards. References: See Developer.
Appurtenance – Equipment and/or accessories that are a necessary part of an operating utility
system or subsystem.
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APWA – American Public Works Association.
ASTM – American Society for Testing and Materials.
Backfill – Replacement of excavated material with suitable material compacted as specified.
Backwater – Water held back by some obstruction, natural or artificial.
Backwater Curve – A plot of depth versus location along the channel containing backwater.
Bicycle Facilities – A general term referring to improvements that accommodate or encourage
bicycling, including parking facilities, bike racks, bicycle route mapping and bicycle route
development.
Boring/Jacking – Grade and alignment-controlled mechanical or other method of installing a
pipe or casing under a street without disturbing the surrounding medium.
Breakaway Structure or Breakaway Design – A structure or installation that has been crash
tested in accordance with National Cooperative Highway Research Program procedures.
(NCHRP 230).
Capacity – (1) The maximum number of vehicles that have a reasonable expectation of passing
over a given roadway or section of roadway in one direction during a given time period under
prevailing roadway and traffic conditions. (2) The volume of liquid or gas that can be transported
by a pipe. (3) The load-carrying limit of a structure.
Carrier – Pipe directly enclosing a transmitted fluid or gas.
Casing – A larger pipe enclosing a carrier for the purpose of providing structural or other
protection to the carrier and/or to allow for carrier replacement without re-excavation, jacking or
boring.
CF – Cubic Feet.
Channelization – The separation or regulation of conflicting traffic movements into definite
paths of travel by the use of pavement markings, raised islands or other suitable means to
facilitate the safe and orderly movement of both vehicles and pedestrians.
Check – A short section of built-up channel placed in a canal or irrigation ditch and provided
with gates or flashboards to control flow or raise upstream level for diversion.
Check Dam – Short berm used as erosion protection on steep drainage ditches.
City – The City Engineer or any designee thereof. References: See City Engineer.
City Council – The City legislative authority.
City Engineer – The City Engineer for the City of Auburn. References: See Engineer.
Clean-Out – A pipe through which plumbing snakes can be pushed to unplug a sewer.
Clear Zone – The total streetside border area, starting at the edge of traveled way, available
for safe use by errant vehicles. This area may consist of a shoulder, a recoverable slope, a
non-recoverable slope, and/or a clear run-out area. The desired width is dependent upon the
traffic volumes, speeds, and the streetside geometry.
CMP – Corrugated Metal Pipe.
Coating – Protective material applied to the exterior of a pipe or conduit to prevent or reduce
abrasion and/or corrosion damage.
Commercial Property Use – Property with residential developments with four or more dwelling
units per parcel or commercial developments. This is consistent with building permit
administration in City of Auburn.
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Conduit – An enclosed tubular runway for protecting wires or cables.
Contractor – The individual, partnership, firm, corporation or joint venture, contracting with the
Developer to do prescribed work.
Concrete Plain – Concrete that is not reinforced with steel.
Concrete Thrust Blocking – Concrete that is used to support fittings in water mains.
Control Zone – That streetside area defined by the “Control Zone Distance Table”; found in
Appendix 5 of the WSDOT Utilities Manual, within the street right-of-way in which placement of
utility objects is controlled.
Corporation Stop – A brass fitting used to connect service lines to a water main.
Cover – Depth to top of pipe, conduit, casing or gallery below the grade of a street or ditch.
Cross Connection – Connecting fire, irrigation and drinking water supplies together, or
connecting storm and sanitary sewers together.
Cul-de-sac – A street closed at one end by widened pavement of sufficient width for vehicles
to turn around.
CSBC – Crushed Surfacing Base Course.
CSTC – Crushed Surfacing Top Course.
CY – Cubic Yard.
Dead End Street – Street that accesses the roadway system only at one end. See also Stub
End Street.
Dedication – The transfer of land or the interest of land by the owner of such land to the City
for public uses, reserving no other rights than such are compatible with the full exercise and
enjoyment of the uses the property has been dedicated.
Design Speed – Design speed is the maximum safe speed that can be maintained when
conditions are so favorable that the design features of the highway govern.
Detention Tanks and Vaults – Detention tanks and vaults are underground facilities for the
storage of surface water. Tanks are typically constructed from corrugated metal pipe. Vaults
are constructed from reinforced concrete.
Detention Time – The average time spent by water in a basin or structure.
Developer – The Owner and any agent of the Owner authorized to represent the Owner.
References see Applicant.
Development – All structures and other modifications of the natural site above and below
ground on a particular site.
DHV – Design Hour Volume. Hourly traffic volume used for street design and capacity analysis,
usually one or more peak hours during a 24-hour period.
Drain – Appurtenances to discharge accumulated liquids from casings or other enclosures.
Driveway Approach – See Access Point.
Easement – A right to use or control the property of another for designated purposes.
Edge of Traveled Way – The face of curb for streets that are, or will be constructed to urban
standards and the edge of pavement (not shoulder) for streets that are, or will be constructed
to rural standards.
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Embankment – A raised structure constructed of natural soil from an excavation or borrow
source.
Encroachment – Occupancy of City right-of-way by non-roadway structures or other objects
of any kind.
Engineer – The City Engineer for City of Auburn or any designee thereof.
Fixed Object – Any object that is not intended to move or break away upon impact.
Force Main – A sewer line that is pressurized.
Franchise – Occupancy and use document granted by the City required for occupancy of street
rights of way.
Geometrics – The arrangement of the visible elements of a street such as alignment, grade,
sight distance, widths, and slopes.
Grade – Rate or percent of change in slope, either ascending or descending from or along the
roadway. It is measured along the centerline of the roadway or access point.
Gravity Distribution – A water supply that uses natural flow from an elevated tank or mountain
reservoir to supply pressure.
Hazard – A side slope, an object, water, or a drainage device that, if impacted, would apply
unacceptable impact forces on the vehicle occupants or place the occupants in a hazardous
position. It may be either natural or man-made.
Headwall – Entrance to a culvert or sluiceway.
Hydraulic Jump – The rapid change in the depth of flow from a low stage to a high stage
resulting in an abrupt rise of water surface.
Impervious Layer – A geologic layer through which no water can pass.
Infiltration – (1) The act of stormwater permeating into the ground. (2) Groundwater that enters
sewer pipe through cracks and joints, or the movement of water through the upper soil.
Interception – Rain that falls on vegetation and other impervious objects, which evaporates
without contributing to the runoff.
Intersection Sight Distance – The distance required for a vehicle, traveling at or near the
posted speed on a major street, to reduce speed to avoid overtaking a vehicle, which has
entered the intersection from the minor street. The entering vehicle can be making right, left-
turning movements or crossings.
Island – A defined area between traffic lanes for control of vehicle movements and/or for
pedestrian refuge.
Joint Use Driveway Tract – A jointly owned and maintained tract or easement serving 2
properties.
Landing – A road or driveway approach area to any public or private road.
Lateral – A sewer line that goes off at right angles to another.
LF – Linear Feet.
Manhole – An opening in an underground utility system into which workers or others may enter
for the purpose of making installations, inspections, repairs, connections, cleaning, and testing.
Main – A principal pipe in a system that distributes water or collects sewage.
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Median – That portion of a divided roadway separating the traveled ways for traffic in opposite
directions.
Mode Split – The percentage of overall trips made by different means of transportation.
MPH – Miles per hour.
MSE Walls – Mechanically Stabilized Earth Walls.
MUTCD – The Manual on Uniform Traffic Control Devices.
MVO – Minimum valve opening.
NDCBU – Neighborhood Delivery and Collection Box Unit.
Neighborhood – For the purposes of these design standards, a neighborhood is considered
to be one or more residential subdivisions and parcels that are interconnected by local
residential streets and typically bound by arterial and collector streets or other boundaries such
as rivers, critical slopes, or jurisdictional boundaries.
Nonpotable – Fluid that is not for human consumption, but may be used for other purposes,
such as sewage and stormwater runoff. Gas mains are also considered nonpotable.
Outfall – The pipe that discharges completely treated wastewater or stormwater runoff into a
lake, stream or river.
Passing Sight Distance – The minimum sight distance required for the driver of one vehicle
to pass another vehicle safely and comfortably.
Pavement – The combination of gravel base, crushed rock, and asphalt concrete pavement
placed on a subgrade to support the traffic load and distribute it to the subgrade.
Pavement Width – The distance measured from face of curb to face of curb for curbed sections
of roadway or the distance measured from outside edge of shoulder to outside edge of shoulder
for shouldered sections of roadway.
PC – Point of Curvature.
PCC – Portland Cement Concrete.
Peak-Hour – That period experiencing the highest volume of traffic.
Peak Period – Two hours during any a.m. or p.m. period when vehicle arrival and departure
from the site or corridor is the highest.
Perimeter Streets – Public streets comprising the perimeter of a particular
commercial/industrial development.
Permit – A document including any license, permit or franchise authorizing specified use of
City right-of-way and granted under the authorization of the regulating agency.
Pipe – A structural tubular product designed, tested, and produced for the transmittance of
specific liquids and gases under specific conditions.
PI – Point of Intersection.
Plowing – Direct burial of utility lines by means of a `plow’ type mechanism, which breaks the
ground, places the utility line at a predetermined depth, and closes the break in the ground.
Posted Speed – Is the signed speed limit along a street.
Potable – Water that is Drinkable.
PRC – Point of reverse curvature.
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Pressure – Internal gage pressure in a pipe in pounds per square inch, gage (psig).
Private Street – A privately owned and maintained access provided for by a tract, easement
or other legal means.
Professional Engineer – An engineer licensed to practice in the State of Washington.
Professional Land Surveyor – A surveyor licensed to practice in the State of Washington.
Public Street – A publicly owned facility that provides access, including the roadway and all
other improvements.
PT – Point of Tangency
Relocation – Planned change of location of an existing facility to a more advantageous place
without changing the character or general physical nature of the facility.
Replacement – Installation of a like element of a utility system or subsystem in the same or
near-same physical location normally due to damage, wear or obsolescence of the element.
Restoration – All work necessary to replace, repair or otherwise restore the right-of-way and
all features contained within to the same or equal condition as before any change or
construction thereto.
Reviewing Agency – City of Auburn.
Restricted Access Point – A driveway or private street that connects to the general public
street system, that turning movements are restricted to right in and out only.
Right-of-way (R/W) – All property in which the City has any form of ownership or title and which
is held for public street purposes, regardless of whether or not any street exists thereon or
whether or not it is used, improved, or maintained for public travel.
Riprap – Pieces of broken stone used to protect the sides of waterways from erosion.
Roadway Intersection – location where two or more roadways intersect, including private
roads but excluding alley’s, driveways, shared driveways, and access tracts.
Rural – All lands regardless of current comprehensive plan designation not meeting the
definition of Urban.
Sand Trap – A section constructed deeper than the rest of the channel to allow sediment to
settle out.
Separate Turn Lane – An auxiliary lane for traffic in one direction which has been physically
separated from the intersection area by a traffic island or stripe. Separate turn lanes may be
included within intersections or separated from intersection areas by traffic islands.
SF – Square Feet.
Shoulder – That portion of the roadway contiguous with the traveled way for accommodating
stopped vehicles, for emergency use, and for lateral support of base and surface courses.
Single Main System – One main supplies both drinking water and firefighting water.
Single Occupancy Vehicle (SOV) – Automobiles transporting the driver only.
Slab – A cast concrete member of uniform thickness.
Standards – The City of Auburn Engineering Design Standards.
Stopping Sight Distance – The distance needed for a vehicle traveling at or near design speed
to stop before reaching a stationary object in its path.
Issued January 2022 City of Auburn
Engineering Design Standards Page 17
Street or Roadway – A public way, open for the passage of vehicles and persons. Limits
include the outside edge of sidewalks, or curbs and gutters, or side ditches, including the
appertaining shoulder and all slopes, ditches, channels, waterways, and other features
necessary for proper drainage and protection within the right-of-way.
Street Frontage – Any part of private or public property that borders a public street.
Street Tree – A tree placed within the public right-of-way.
Stub End Street – A dead end street that is planned to be extended and connected to future
streets in an adjacent development. Depending on its length, it may or may not require a
temporary cul-de-sac.
Substantial – In the sole opinion of the City Engineer, of ample or considerable amount,
quantity, or size.
Surface Retention – That part of a storm that does not immediately appear as infiltration or
surface runoff. Retention is made up of depression storage, interception and evaporation.
Time of Concentration – The time required for water to flow from the most distant point on a
runoff area to the measurement or collection point.
Traffic Control – Those activities necessary to safeguard the general public, as well as all
workers, during the construction and maintenance of roadway and other facilities within the
right-of-way.
Traveled Way – That portion of the roadway intended for the movement of vehicles, exclusive
of shoulders.
Trenched – Installation of a utility in an open excavation.
Trip – A one-direction movement that begins at the origin and ends at the destination. For
example, a trip movement from a residence to a work place is a trip from home to work.
Trip Generation – A general term describing the analysis and application of the relationships
that exist between the trip makers, the traffic study area, and the trip making. It relates to the
number of trip ends in any part of the traffic study area.
Uniform Flow – Flow that has a constant depth, volume, and shape along its course.
Unopened Right-of-way – A City right-of-way that exists by dedication or deed, but for which
no vehicular roadway has been constructed by the City or other parties, and the street is not
maintained by the City.
Unrestricted Access Point – A driveway or private street that connects to the general public
street system, that has no limitations on turning movements. Left, right turns in and out are
permissible.
Untrenched – Installation of a utility without breaking the ground or pavement surface such as
by jacking or boring.
Utility – A company providing such public services as gas, electric power, telephone, water,
sewer, or cable television, whether or not such company is privately owned or owned by a
governmental entity.
Vent – Appurtenance to discharge gaseous contaminants from casings or other enclosures.
Wetpond – A stormwater pond that has been designed to retain a permanent pool of water
“wetpool” to provide treatment of storm runoff.
Wetpool – The permanent pool of water retained in a wetpond or wetvault.
Issued January 2022 City of Auburn
Engineering Design Standards Page 18
Wetvault – A stormwater vault that has been designed to retain a permanent pool of water
“wetpool” to provide treatment of storm runoff.
1.02 Contact Information
Permit Center
Physical address:
Auburn Professional Plaza – Customer Service Center (2nd Floor)
One East Main Street
Mailing address:
25 West Main Street
Auburn, Washington 98001-4998
Email address:
permitcenter@auburnwa.gov
Public Works Department – Engineering Services:
Phone: (253) 931-3010
Department of Community Development:
Building Phone: (253) 931-3020
Planning Phone: (253) 931-3090
Email address: development@auburnwa.gov and/or permitcenter@auburnwa.gov
1.03 City Reference Material
Unless noted otherwise, reference material referred to herein may be obtained from the
City of Auburn’s website or by clicking on the hyperlink below:
Auburn Reference Material
1.03.01 City of Auburn Surface Water Management Manual (SWMM)
The City of Auburn Surface Water Management Manual (SWMM) is the 2019 Department
of Ecology Stormwater Management Manual for Western Washington (DOE SWMMWW)
and City of Auburn Supplemental Manual. The SWMM is a manual of specific requirements
related to storm drainage management. See Section 6.01 for more information.
1.03.02 City of Auburn Engineering Construction Standards Manual
The Engineering Construction Standards manual sets forth the standards used during the
construction of all civil projects within the City’s jurisdiction, including the extension of public
water, sanitary sewer, storm drainage, and transportation facilities by private
developments. The manual is comprised of two parts: Part 1 contains the City’s Special
Provisions that supplement and modify the current “Washington State Department of
Transportation (WSDOT/APWA) Standard Specifications for Road, Bridge and Municipal
Construction”. Part 2 contains the City’s Standard Details, comprised of the City’s
construction and design detail drawings for temporary erosion control, grading, water,
sanitary sewer, storm drainage, and street work within the City that are supplemented by
the “Washington State Department of Transportation’s (WSDOT) Standard Plans.”
Standard Details as referenced herein refer to the current City of Auburn Standard Details
included in the City of Auburn Engineering Construction Standards – Part 2, Standard
Issued January 2022 City of Auburn
Engineering Design Standards Page 19
Details. WSDOT Standard Plans as referenced herein refer to current WSDOT Standard
Plans. The referenced details and plans shall be the standard except as modified by Part
1 (Special Provisions) of the Engineering Construction Standards and by this document
(City of Auburn Engineering Design Standards).
1.03.03 Planning Documents
The following planning documents can be found on the City’s website or by clicking on the
hyperlinks below:
Auburn Comprehensive Plan
Transportation Improvement Program
Comprehensive Transportation Plan
2016 Comprehensive Sewer Plan
2015 Comprehensive Water Plan
2015 Comprehensive Storm Drainage Plan
1.03.04 Informational Handouts
Handouts are currently available from the City to aid the public in planning and constructing
development projects within the City of Auburn. Contact the Permit Center or see the City’s
website by clicking on the hyperlink below (select ‘Information Handouts’) for the most
current list available:
https://www.auburnwa.gov/city_hall/public_works/standards_publications
1.03.05 Additional Technical Information
Additional design guidance and standards for specialized facilities such as pump stations,
pressure reducing stations, traffic signals, roundabouts, and others are not include herein,
but may be provided by the City as guidance to supplement efforts during design
discussions.
1.03.06 Other Reference Material
The following publications are to be used for design applications and can typically be found
on the publishing agency’s website. In case of conflict between City publications and those
referenced below, the City publication will take precedence:
A. City of Auburn Code related to development requirements.
B. Washington State Department of Transportation (WSDOT) “Standard
Specifications for Street, Bridge and Municipal Construction” as amended by the
City’s Special Provisions (Part 1 of the Construction Standards). These will be
referred to in City publications as the “WSDOT Standard Specifications.”
C. Washington State Department of Transportation (WSDOT) “Design Manual” (latest
edition).
D. Washington State Department of Transportation (WSDOT) “Standard Plans”
E. American Association of State Highway and Transportation Officials’ (AASHTO) “A
Policy on Geometric Design of Highways and Streets” (latest edition).
Issued January 2022 City of Auburn
Engineering Design Standards Page 20
F. FHWA and Washington State Department of Transportation, Manual on Uniform
Traffic Control Devices (MUTCD)
G. Transportation Research Board’s (TRB) Roundabouts: An Informational Guide, 2nd
Edition (NCHRP 672)
H. State of Washington Department of Ecology’s “Criteria for Sewage Works Design”
(latest edition).
I. State of Washington Department of Health (DOH) “Water Systems Design Manual”
(latest edition).
J. American Water Works Association (AWWA) Standard Specifications (latest
edition).
K. “IES Lighting Handbook” (Illuminating Engineering Society of North America)
(latest edition).
L. American National Standard for Roadway Lighting ANSI/IESNA RP-8-00 (latest
edition).
1.04 Deviation from Standards
In some cases, City standards may not best address a particular engineering application.
In these instances, a design deviation from the City’s standards may be requested from
the City Engineer. Except deviations for City capital improvement projects, deviations shall
be made using the City’s Deviation Request Application and shall include applicable
engineering justification for the deviation. Deviation requests and supporting justification
must be sealed by a professional engineer. The City Engineer will evaluate the request
and notify the applicant of a decision within 15 working days upon receipt of a complete
deviation request or with the completion of the first review of the development review plans
or plats (for Short Plats, Plats, FAC’s and Grading Permits), whichever is later. Additional
City review time may be required in certain circumstances and will be coordinated with the
applicant. For deviation applications that are associated with a preliminary plat application
submitted in compliance with Chapter 17.10 Auburn City Code, the deviation application
and a recommendation from the City Engineer must accompany the preliminary plat to the
hearing examiner. The hearing examiner must obtain the concurrence of the City Engineer
for any requests to modify any City of Auburn design or construction standard. Approved
deviations must be shown on the final civil site improvement plans as specified in Chapter
3.
Deviations for City capital improvement projects will be reviewed and approved by the City
Engineer during design review. The City Engineer signing the final plans as approved for
construction constitute approval of any deviations from these Standards.
The deviations identified in the following subsections may be obtained from the City of
Auburn:
1.04.01 General Deviations
General deviations apply to all engineering design standards except for the Surface Water
Management Manual’s Minimum Requirement deviations.
The engineering design deviation, with compelling supporting justification, shall clearly
demonstrate the engineering design standard for which the deviation is being sought is not
physically or technically possible, would have undesirable impacts to public or private
infrastructure and property, or would impact critical areas.
Issued January 2022 City of Auburn
Engineering Design Standards Page 21
Additionally, the proposed deviation will meet or exceed the corresponding City standard
for the following applicable criteria:
A. The functional intent of the design element.
B. Safety factors associated with the design element.
C. Operational concerns associated with the design element.
D. Maintenance concerns associated with the design element.
E. Liability concerns associated with the design element.
F. The capacity and/or efficiency of the design element.
G. The design life, historical performance, and durability of the design element.
H. The aesthetic and visual impacts of the design element.
I. The cost effectiveness and availability of any replacement components or materials.
J. Consistency with the spirit and purpose of the corresponding City design standard.
K. Demonstration that the environment will not be adversely affected.
L. Supported by published industry standards.
M. The effect on buildable lands within the City of Auburn.
1.04.02 Surface Water Management Manual (SWMM) Deviations
A deviation request from any of the 10 minimum requirements in the SWMM goes
through a different process which includes a public notice requirement. This is to insure
that the Department of Ecology mandated surface water regulations are complied with.
The 10 Minimum Requirements of the SWMM can be found in Section 6.01.
Requests for deviations from the 10 Minimum Requirements of the SWMM shall be in
accordance with Auburn City Code 13.48.226 and these standards.
1.05 Appeal of City Engineer’s Decision
Appeal of the City Engineer’s decision shall follow the following procedure:
The applicant shall have 15 working days from the date of receipt of the City Engineer’s
decision in which to submit a written notice to the Public Works Director contesting the decision
of the City Engineer. The Public Works Director shall then have 15 working days to notify the
applicant of a decision to uphold or modify the City Engineer’s decision. For appeals of
engineering deviations requests, the Public Works Director’s determination shall be final.
1.06 Changes to Standards
Per Auburn City Code 12.04.010, the City Engineer is authorized to make any additions,
deletions, or modifications stated in these Standards with consultation with the City Council
on policy issues or broad Citywide implications.
Issued January 2022 City of Auburn
Engineering Design Standards Page 22
1.07 Downtown Sidewalk Design Guidelines
In 2007, the City Council passed Resolution 4271 that approved and adopted for inclusion into
the Engineering Design Standards the Auburn Sidewalk Design Guidelines (Guidelines).
Since then, the Guidelines have been revised in consultation with the Downtown
Redevelopment Committee (formerly a committee of City Council members) and at the
Council Study Session on November 23, 2020. The Downtown Sidewalk Design Guidelines
provide general design concepts for sidewalks, street lights, street corners, street trees, and
crosswalks within the Downtown Urban Center (DUC) Zone.
Specifics to the following areas applicable to these guidelines can be found in Chapter 10 of
these standards:
Downtown Sidewalks (See Section 10.06.04)
Street Corners (See Section 10.06.06)
Street Trees in Grates (See Section 10.09.02)
Pedestrian Crosswalks (See Section 10.16.05)
Street Lighting (See Section 10.11.05)
Traffic Signals (See Section 10.16.13)
Should any conflict exist between the Downtown Sidewalk Design Guidelines and the design
criteria, Chapter 10, of this document, the Downtown Sidewalk Design Guidelines shall control
in those portions of the Downtown Urban Center Zone.
1.07.01 Applicability
1. The Guidelines are applicable within the boundaries of the Downtown Urban Center
(DUC) zone as defined in the Comprehensive Plan zoning map, except as specified
herein.
2. Where the DUC zone boundaries are shown along or within a street, the Guidelines
apply to both sides of the street.
3. Streets west of the north/south Burlington Northern Santa Fe (BNSF) railroad tracks
are exempt from the Guidelines.
4. All local streets, except N. Division Street and B Street NW, are exempt from the
Guidelines.
5. The Guidelines apply to A Street NE/NW except that sidewalks may be 8 feet wide and
street tree grates may be 4 feet wide x 6 feet long on the corridor.
6. South Division Street from 3rd Street SE/SW through W Main St, also referred to as the
“Promenade” shall have a distinctive design separate from these Downtown Auburn
Design guidelines. Unless specifically noted herein or unless otherwise directed by the
City Engineer, these guidelines will not apply to this area. However, they are intended
to be compatible with that design. Wherever infrastructure is replaced, restored, or
expanded within the Promenade area, the infrastructure shall be built to match those
project specific standards.
Issued January 2022 City of Auburn
Engineering Design Standards Page 23
Figure 1-01 Downtown Sidewalk Design Guidelines Applicability Map
Issued January 2022 City of Auburn
Engineering Design Standards Page 24
2 Plan Approval Process
2.00 Preface
This chapter contains standards and procedures that apply to the review and approval process
for civil engineering plans. Development or redevelopment of property within the City of Auburn,
and/or within the limits of Auburn’s Utility Service Area, that require civil engineered plans to
support a development action must follow the processes outlined in the subsections below.
2.01 Types of Plans
This section contains information regarding the types of civil engineering plans submitted to the
City. Specific plan requirements are described in detail in Chapter 3.
Civil engineering plans submitted to the City for review fall within the following four categories.
2.01.01 Grading Plans
Grading plans are required prior to the issuance of a Grading Permit and before
commencement of construction if triggered per Auburn City Code 15.74.
2.01.02 Building Site Plans
A Building Site Plan includes all civil site development requirements including site layout,
building location, site access, parking, code required landscaping, utility service, and storm
drainage control. An approved Site Plan is required prior to the issuance of a Building
Permit and before commencement of construction.
A building Site Plan is required for all new non-residential developments and residential
construction of 3 units or more per lot.
2.01.03 Public Facility Extension (FAC) Plans and Agreement
City of Auburn approved Public Facilities Extension (FAC) Plans and an executed FAC
Agreement are required prior to construction of City of Auburn sanitary sewer, water, storm
drainage, and/or transportation facilities by any party other than the City of Auburn.
2.01.04 Other Plans
Some projects may also require other types of plans. The requirements for these additional
plans will usually be addressed early in the submittal process. These plans could include,
but are not limited to, the following:
A. Landscape plans, prepared in accordance with Auburn City Code 18.50.
B. Land clearing plans, prepared in accordance with Auburn City Code 15.74.
C. Irrigation plans, prepared in accordance with Auburn City Code 18.50.
D. Critical Area restoration/enhancement plans, prepared in accordance with Auburn
City Code 16.10.
E. City-Owned Retaining Wall Plans and Structural Calculations.
F. Illumination/Site Lighting Plans, prepared in accordance with Auburn City Code
18.55.
Issued January 2022 City of Auburn
Engineering Design Standards Page 25
2.02 Review and Approval Process
2.02.01 Submittals
When submitting civil engineering plans to the City for review, the following steps are
required to insure a complete submittal and timely approval of civil engineering plans:
A. Applicants are encouraged to meet with City staff prior to plan submittal.
(Pre-application information is available through the City of Auburn Permit Center)
All plans and associated documents submitted to the City will be assigned a project
number and receive a preliminary review to make sure they adequately address the
minimum requirements of a complete application. Any such plans and associated
documents not meeting these requirements will be returned to the applicant or the
applicant’s designee as unacceptable for review, with a written explanation of
necessary corrections required prior to the subsequent resubmission.
B. Prior to preparing civil engineering plans for submittal, the applicant shall obtain a
Civil Site Improvement Handout.pdf from the City, for the appropriate type of plans.
This packet contains information necessary to prepare plans in conformance with
City guidelines along with the minimum required civil site improvement application.
The checklists within the Civil Site Improvement Submittal Packet shall be
completed and submitted along with the civil engineering plans.
C. Civil Engineering plans and associated documents are to be submitted to the City
for processing. All submittal documents (Reports & Plans) must be single .pdfs and
not require collating, with file names that clearly state the document type and may
be submitted through www.MyBuildingPermit.com. If you have any questions
regarding the application process or submittal requirements please contact the City
Permit Center at applications@auburnwa.gov, 253-931-3020 or Development
Engineering at development@auburnwa.gov, (253) 876-1969, or in person at the
City of Auburn Permit Center on the Second Floor of the Auburn Professional Plaza,
One East Main Street.
D. After the receipt of a completed Civil Site Improvement Application and application
fees, the City will make a preliminary review of the plans and supporting data to
verify the scope of the proposed extension(s) and check for completeness of the
application. The City requires 28 calendar days from the date of initial submittal to
determine if the application is complete. Once the City is satisfied with the
completeness of the application and the application fees have been paid, the 1st
detailed civil site improvement review will begin.
E. Once the length of the public extension(s) and/or hours required for
review/inspection have been verified/calculated, 30% of the review and inspection
fees are due with the application for 2nd review. Detailed FAC Plan review work for
the 2nd review will not continue until 30% of the review and inspection fee is paid. If
no 2nd review is needed then payment of the full review and inspection fee is due
before the City signs the facility extension agreement.
F. All proposed public right-of-way dedications shall be dedicated to the City prior to
start of construction with the exception of plats and short plats. A title report pulled
within 30 calendar days of the application will be required to confirm property
ownership and to verify that the portions of the property dedicated as right-of-way
and/or easements have been cleared of encumbrances. The applicant is
responsible for clearing all encumbrances the City determines to be inconsistent or
in conflict with the intended purpose of the dedications. Title insurance shall be
Issued January 2022 City of Auburn
Engineering Design Standards Page 26
provided to the City for right-of-way dedications in the amount of $50.00 per square
foot of right-of-way area dedicated, or other amount as proposed by the Developer
and accepted by the City Engineer. Easements shall be executed by the Applicant
prior to start of construction. Easement documents will be held by the City until the
end of construction, at which time the easement exhibits and descriptions may need
to be updated by the Applicant, based on as-built conditions, except easements
that are being granted by someone other than the Applicant which will be recorded
prior to the start of construction. Once the easements are confirmed to match field
conditions, the easements will be recorded by the City.
G. The following applicable information may be required along with the plan submittal:
1. Title report (required if right-of-way is being dedicated).
2. The final biologist report, including the wetland mitigation plan, when
appropriate.
3. Traffic reports.
4. A copy of other applicable applications (Short Subdivisions, Subdivisions,
etc.).
5. Letter indicating how SEPA and/or other applicable application conditions
have been accounted for in the development/plan process.
H. All final plans, calculations, or reports submitted for review shall be stamped by a
Professional Engineer. Electronically signed seals will only be accepted if they meet
the requirements of WAC 196-23-070.
I. Where the plan review process is running concurrent with other applications (SEPA,
Subdivisions, etc.), the above-referenced information may not be available at time
of plan submittal. In such instances, other required applications shall be provided
prior to final plan approval.
J. All final approved Plan submittals shall include the associated electronic AutoCAD
files.
K. If the project is to be phased, phasing plans must be submitted per the requirements
specified herein.
2.02.02 City Review
The City will review plans and associated calculations, reports, and AutoCAD files for
conformance with City development requirements, standards, and policies. Marked up
construction drawings, calculations, reports, and written plan review comments will be
returned to the applicant’s designated contact person for revisions. The applicant’s
engineer shall revise construction drawings, calculations, or reports to address City plan
review comments and provide comprehensive comment responses in a unique color
directly on the marked-up documents along with the updated documents. The revised
drawings (the required number will be determined by the City) and associated calculations
and reports, along with the redline comments, shall be resubmitted to the City for additional
review.
2.02.03 Plan Approval
Once the plan review process is completed and all City review comments have been
addressed, the City will request that one electronic copy of the sealed plans and reports
be submitted for approval.
Issued January 2022 City of Auburn
Engineering Design Standards Page 27
A. Final reproducible plans shall be produced in .pdf format, signed and stamped by a
professional engineer and provided to the City for approval signatures, along with
the final AutoCAD files. Electronically signed seals must meet the requirements of
WAC 196-23-070 and also provide permissions for City staff to apply signatures to
the approved plans. The City will return the signed and approved plans to the
Applicant.
B. All applicable AutoCAD files shall be submitted to the City on a compact disk, flash
drive or electronically transferred to development@auburnwa.gov for integration
into the City’s Geographic Information System (GIS). For more information on
AutoCAD file submittal, please see Appendix F of this chapter.
2.02.04 Construction Plan Revision
If after plan approval the applicant desires to make changes to the approved plan(s) a
revised plan(s) reflecting such changes shall be required. The following is the general
process required for submitting revisions to the approved plans after plan approval:
A. Provide a written summary of the proposed plan/report changes to the Development
Review Engineer assigned to the project or to development@auburnwa.gov.
B. Submit for City review, comment, and approval, the revised plans.
C. Changes on the plans can be clouded for ease of review, but will need to be
removed prior to approval of the construction plan revision.
D. Provide the text “REVISION” in 0.2” height bold text above the approval block (B-3
in Appendix A) on all sheets that are being revised and submitted for review.
E. Provide a date and brief revision description in the revision title block.
F. Include the cover sheet of the plans even if revisions are not proposed on the cover
sheet as the cover sheet is the sheet that has approval lines for the Planner and
City Engineer.
2.02.05 Project Close Out
The following is the general process required for accepting construction completion on a
project:
A. Construction Record Drawings (also referred to as the Construction Redlines) refer
to the field changes the Applicant clearly tracks and marks on the final approved
and signed plans that are retained throughout construction, in accordance with the
requirements specified in the Construction Standards.
B. After completion of construction, the Applicant shall submit the Construction Record
Drawings to the City electronically for review and comment. After the City has
concurred the Construction Record Drawings reflect the as-built conditions and
meet City record drawing standards, as described in the City Construction
Standards, the Applicant shall utilize them to produce the Final As-built Record
Drawing set for submission to the City. A copy of the “Record Construction
Document Packet” which outlines the complete record drawing process in detail
can be obtained from the City.
Issued January 2022 City of Auburn
Engineering Design Standards Page 28
C. The Applicant shall also provide the City the current AutoCAD drawing files to reflect
any revisions that occurred after plan approval and submit an electronic PDF set to
the City.
D. The City will apply an ‘As-Built’ stamp on each sheet of the submitted Final As-built
Record Drawing set and apply a “Record Drawing Certification” block on the Cover
sheet. The Record Drawing Certification will be signed by the City and the Final As-
built Record Drawings will be archived and imported into the City’s GIS database..
E. A final Stormwater Site Plan certification letter shall be stamped, signed and
submitted by the Engineer of Record to the City verifying that the storm facilities
were installed as designed or note any minor changes during construction that
require no changes to the Stormwater Site Plan report.
F. Submit an electronic copy of the Stormwater Site Plan report and Geotechnical
Report if there have been changes during construction.
The following shall also be completed for projects prior to project close out.
A. All legal documents, including but not limited to a Bill of Sale and Utility Easements,
shall be updated as needed and executed.
B. For all FACs, a “Developer Contributions Document” for all public transportation,
water, sewer, and storm facilities constructed as part of the project shall be obtained
from the City, completed, and returned electronically to the City.
C. All Warranty Bonds or Assignments of Funds for the 1 to 2-year warranty period
shall be in place.
Issued January 2022 City of Auburn
Engineering Design Standards Page 29
3 Plan Preparation Requirements
3.00 Preface
This chapter describes City requirements for plans submitted to the City for review and
approval. Civil engineering plans must meet these standards in order to move through the
review process in an efficient manner and in order to receive approval.
3.01 General Requirements
The following general requirements apply to civil engineering plans submitted for review and
approval by the City:
A. The general construction requirements for the City shall be those contained in the City
of Auburn’s current Engineering Construction Standards Manual which supplements
or modifies the “Washington State Department of Transportation (WSDOT) Standard
Specifications for Road, Bridge and Municipal Construction,” except where
supplemented or modified by the City in this manual.
B. The civil engineering plans shall reference City Standard Specifications, Standard
Details, and WSDOT Standard Plans as necessary. The City’s Standard
Specifications and Standard Details are contained in the Engineering Construction
Standards, a copy of which shall be on-site during construction.
C. All civil engineering plans and reports shall be prepared and sealed by a professional
engineer.
D. Property surveys shall be performed and prepared per WAC 332-130-145, sealed and
signed by a professional land surveyor and be tied to the current City datum (NAVD
88) and horizontal control datum shall be NAD83 (1991) as officially adjusted and
published by the National Geodetic Survey. (WAC 332-160-060 and RCW 58.20). A
list of City Benchmarks is available upon request.
E. All civil engineering plans and calculations shall be neat, uncluttered, legible, and in
conformance with the requirements herein.
F. All plans shall be prepared utilizing AutoCAD software in accordance with the
standards specified herein.
G. For a Development project, all deviations from City’s Engineering Design and
Construction Standards must be shown on the plans with a note call-out and
description that references the City assigned deviation number and deviation approval
date. The format of these call-outs and note descriptions shall be as shown in Appendix
C of this Chapter.
H. Except as approved otherwise by the City Engineer, a project may qualify for a Minor
Grading Permit Submittal. Refer to Appendix E for project thresholds to quality for a
Minor Grading Permit and the submittal requirements.
3.02 Plan Format
The City requires that plan sets be submitted in an order consistent with this section. Depending
on the complexity or simplicity of the project, the amount of detail and content required will be
subject to change. Depending on the scope of the project the civil site improvement plans may
Issued January 2022 City of Auburn
Engineering Design Standards Page 30
be comprised of a combination of the grading, site and facility extension (FAC) plan elements
outlined below to create a set of Civil Site Improvement Plans.
Civil Site Improvement Plans shall consist of the following sheets:
A. Cover sheet (See Section 3.04.01).
B. Temporary Erosion and Sediment Control (TESC)/Demo Sheet (Land Clearing when
applicable) (See Section 3.04.02).
C. Grading and Private Storm Drainage Plan (See Section 3.04.03).
D. Utility Plan and Profiles if applicable (See Sections 3.04.07 & 3.04.09).
E. Street and/or Storm Plan and Profiles if applicable (See Sections 3.04.08 & 3.04.09).
F. Street Cross-Sections and Additional Street Elements if applicable (See Section
3.04.09).
G. Cross-Sections (See Section 3.04.04).
H. Details (See Section 3.04.05).
I. Street and/or Site and Landscape Plan (See Section 3.04.10).
J. Irrigation Plan if applicable (See Section 3.04.11).
If a separate associated grading plan has been submitted and approved, those areas
covered under the grading plans will not need to be readdressed in the building site plans.
Issued January 2022 City of Auburn
Engineering Design Standards Page 31
3.03 General Plan Requirements
3.03.01 Standard Plan Format
Applicable information in this section shall be shown on the plan set.
A. Each sheet of the plan set shall be stamped by a professional engineer.
B. North arrow.
C. The title block shall include the development/Capital project title (in bold print), the
name, address and phone number of the firm preparing the plan and the
owner/developer, a revision block (showing the date of the latest revision), page of
pages numbering, and sheet title (e.g., road and storm drainage, grading,
erosion/sedimentation control, water and sanitary sewer).
D. Indicate units of measurement for all slope callouts as either percent (%) or feet per
foot (ft./ft.). Do not mix units of measurement on a plan set.
E. Provide all match lines with matched sheet numbers (stationing).
F. The street classification shall be provided under the street name on all plan views.
G. For the approved Development project plans, a City of Auburn approval block (4”x2”)
shall be provided in lower right corner of each plan sheet after the cover sheet. Show
project reference numbers (BLD for Building Permit, FAC for Public Facility Extension
Plan, STM for Storm Permit and/or GRA for Grading/Erosion Control Permit) in the
approval block area. A blank Auburn Engineering approval block is shown as block
B-1 in Appendix A of this chapter.
The locations of the title blocks, approval blocks, and engineering stamp shall remain
consistent throughout all the plan sheets.
3.03.02 Drafting Standards
Drafting requirements are as follows:
A. Plan sheets should be formatted to print on 22”x34” size paper. Any variation must
be approved by the City prior to plan submittal. Approved plans shall be produced
per Section 2.02.03 of the Engineering Design Standards. Margins should be set to
provide for ½ size drawings to fit on 11”x 17“ sheet size.
B. Lettering size shall be no smaller than one tenth (1/10) of an inch in height and shall
be uppercase. Callouts and other information shall be printed horizontally in most
cases.
C. Existing features shall be shown with dashed lines and/or screened back APWA line
types and symbols (screening 45%).
D. Proposed features shall be shown with APWA symbols and line types. The intent is
to clearly distinguish existing features from proposed improvements.
Issued January 2022 City of Auburn
Engineering Design Standards Page 32
E. Minimum scale shall be:
1. Site work: 1” = 40’ horizontal.
2. Public facility work: 1” = 20’ horizontal.
Vertical scales are to be 1/10th the horizontal scale except for public facility work in
areas with steep slopes, 1” = 5’ may be used in place of 1” = 2’.
Use a scale that best utilizes paper space and gives the best overall view of the site.
F. Use APWA AutoCAD symbols and line types in the legend to identify both existing
and proposed improvements and utilities.
G. Electronic AutoCAD files shall be prepared in accordance with the Layers Standard
included in Appendix F of this chapter. A .dwt file containing the AutoCAD layers can
be found on the City’s website or by clicking on the following hyperlink: Development
AutoCAD Layers and Linetypes
H. Electronic AutoCAD files shall be geo-rectified per the standards specified herein.
3.04 Plan Sheet Elements
The following section covers the basic elements that are required to be shown on the different
plan sheets. While all plan sets will have a cover sheet, there are other sheets covered here
that may or may not be included in a particular projects plan set.
3.04.01 Cover Sheet
The Cover Sheet and General Information Sheet(s) shall incorporate all the requirements
listed in Section 3.02, plus the following applicable items:
A. A general scaled site plan covering an area approximately 10 inches square.
B. Vicinity map (approximate scale) with north arrow covering an area approximately
5 inches square.
C. Site address.
D. Owner/Applicant, address, contact, phone number, and e-mail address.
E. Engineer/Surveyor/Architect address, contact, phone number, and e-mail address.
F. Elevations with City datum (NAVD 88) tied to City benchmarks with reference to the
benchmarks’ numbers and locations indicated. Horizontal control information
(NAD83). See Appendix E of this chapter for more information on survey
requirements.
G. Monuments used for horizontal control per the City’s horizontal control datum
NAD83 (1991) with a description of the monument and northing and easting.
H. The permit number in 1 inch bold lettering shall be above the title block (located on
the right side of the sheet) on the cover sheet only.
I. Sheet Index with reference to all civil plan sheets.
J. Legend of all existing and proposed lines and symbols used on the plans.
K. Full legal description(s) including quarter section, section, township, and range.
L. Parcel number(s).
M. Site zoning and adjacent zoning (may be shown on a separate vicinity map sheet).
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N. Applicable plat name and lot numbers.
O. Applicable site information including the number of parking spaces required and the
number of parking spaces provided.
P. Type of building construction as defined by the adopted Building Code and the
building height as defined in Appendix D of the International Fire Code.
Q. Site access including adjacent driveways, roadways, and intersections that may
have an impact on the location and type of site access.
R. An overall site plan key map shall be shown if the plan set includes more than 4
plan sheets, unless otherwise directed by the city.
S. Construction Sequence outlining a basic construction schedule for all elements of
the project. (See Section 5.05 for a sample construction sequence related to storm
and TESC elements) In addition, depending upon the nature of the project, the
construction of some public facilities may also dictate separate construction
sequencing requirements that will also need to be indicated on the plans.
T. The City of Auburn General Notes as shown in Appendix B of this chapter.
U. Provide a list of the additional non-building permits required for this project. The City
will update this list with the 1st review comments.
V. Indicate approximate fill and excavation quantities in cubic yards. Refer to the Civil
Site Improvement Submittal Packet (FAC & GRA) checklist located on the City’s
website for required format.
W. Storm drainage related quantities and information required to support calculation of
System Development Charges (SDC). Refer to the Civil Site Improvement
Submittal Packet (FAC & GRA) checklist located on the City’s website for required
format.
X. The City of Auburn Engineering Approval Block, (min size 2” x 8.5”) as shown in
Appendix A of this chapter. A blank Auburn Engineering approval block is shown
as block B-3 in Appendix A of this chapter.
3.04.02 Temporary Erosion and Sediment Control (TESC) Plan Sheet
TESC design shall be in accordance with Chapter 5 – TESC, Clearing, and Grading, and
include the following applicable items:
A. Marked clearing work limits, environmentally sensitive areas and their buffers, and
trees that are to remain.
B. Indicate the location of the construction entrance
C. Provide the onsite stormwater facilities during construction.
D. Indicate the minimum temporary erosion control measures to be used on the site
during construction, this may include, silt fencing, interceptor ditches, detention or
retention facilities, flow control structures, etc.
E. Show containment locations for storing pollutants, including waste materials and
demolition debris, prior to their removal from site.
F. In the construction sequence, provide a phasing schedule for installing and
removing TESC BMPs, including the transition from the temporary storm drainage
system to the permanent storm drainage system.
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G. All existing site features and conditions shall be shown on this sheet including the
existing topography.
H. This sheet may also function as a demolition site plan and indicate all existing
features and structures to be removed/demolished and those that will remain.
I. Provide the Auburn Grading and Erosion Control Notes as shown in Appendix B of
this chapter.
3.04.03 Grading and Private Storm Drainage Plan Sheet
The Grading design shall be in accordance with Chapter 5 – TESC, Clearing, and Grading,
and include the following applicable items:
A. Indicate slope of any fill or cut slopes.
B. Show or provide reference for type of fill material and associated compaction
requirements.
C. Show existing significant trees (6 inches in diameter and larger for evergreens and
4 inches in diameter or larger for deciduous). Indicate if tree is to either be retained
or removed.
D. Provide temporary storm drainage retention or detention facilities including City
control structure, water surface (W.S.) elevations, seasonal high groundwater
elevation, orifice sizes, design storms for the W.S. elevations, and release rates.
E. Show horizontal setback between the bottom of any fill placement and the top of
the bank of a defined drainage channel per requirements noted in Section 5.03.03.
F. Show typical ditch sections.
G. Show connections of building roof and foundation drains to the site drainage
system.
H. Show the existing topography shaded back and overlaid by the proposed grades.
I. Show existing and finished elevations and contours. Spot elevations may be
required for relatively flat sites to supplement the contour elevations as necessary
to adequately reflect existing and finish grades. Provide spot elevations along
property line and a minimum of 30 feet beyond property line (at least 50 foot
intervals).
J. Reference standard City of Auburn Detail Numbers appropriately. If a project
specifies modification to a Standard Detail, a new detail must be shown on the
plans.
K. Provide notes to protect and maintain erosion control facilities during grading
operations.
L. Provide arrows to indicate drainage flow direction on paved surfaces.
M. Show layout of the entire storm drainage pipe with length, slope, and material type
labeled and direction of flow indicated.
N. Provide site specific details and cross-section sheets for storm drainage detention
or retention facilities.
O. Indicate the emergency overflow to the public storm system.
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P. Show berm dimensions, materials, compaction requirements for ditches and
detention ponds where applicable. When projects include storm ponds, include a
storm pond profile sheet.
Q. Show locations of manholes and catch basins, indicating type, stationing, offset, lid
type, rim and invert elevations. Number manholes and catch basins consecutively.
R. Show existing and proposed sanitary sewers and water mains, identifying crossing
and minimum vertical distance between utilities.
S. Provide type of material and size of energy dissipaters (riprap, etc.).
T. Provide details and cross sections of all low impact development, water quality, and
flow control facilities for stormwater runoff.
U. Show trash racks, if applicable.
V. Show locations, widths and types of easements.
W. Show locations and types of pumps, if applicable.
X. Provide planting and seeding requirements with establishment procedure in
construction sequence for water quantity and quality systems.
Y. Show finish floor elevations.
Z. Show the controlling downstream storm drainage elevations including the
associated design conditions.
AA.For ponds, provide: aesthetics, fencing, power (if applicable), maintenance access,
control structure, critical water surface elevations, and other items, such as walls
and liners.
BB.Address bypass surface flows.
CC.Address subsurface flows and indicate water surface elevations.
DD.Some projects may be able to combine the grading sheet with the erosion control
and demo plan depending on the complexity of the project.
3.04.04 Cross-Section Sheet
The Cross-Section plan sheet(s) shall be provided for projects that propose grading
activities 10 feet or closer to the property line, excavations over 5 feet or fill over 8 inches
in depth or more and have the following applicable items:
A. Cross-sections for fill and grading shall be shown through all properties to at least
30 feet beyond the property lines. Adequate cross-sections shall be shown to
represent the site. At a minimum this shall include one shown in the north direction
(west-east from left to right) and one shown in the east direction (south-north from
left to right) cross-section.
B. This sheet may also contain cross-sections for the temporary storm drainage pond.
C. The scale used for the site cross-sections on this sheet should match the scale on
the other sheets.
Some projects may be able to combine the cross-section sheet with the grading sheet
depending on the complexity of the project.
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3.04.05 Detail Sheet
The Detail sheet(s) shall have the following applicable items:
A. Any detail that is specific to this project.
B. City of Auburn Standard Details are not to be shown on this sheet unless they need
to be modified for a project specific application, in which case the detail would be
shown with the modifications explicitly called out/labeled and shall not include the
City Engineer’s signature from the original detail.
C. Storm control manholes shall be shown on this sheet.
D. This sheet shall contain cross-sections for the storm facility.
City of Auburn Standard Details and WSDOT Standard Plans are to called out on the
applicable plan sheet using the detail or standard plan number.
3.04.06 Utility Plan Sheets
The plan set shall include an overall utility plan that shows the private connections to the
public water and sanitary sewer systems, together with the storm drainage system and
proposed landscaping, and any required extensions of the public water and sanitary sewer
systems. The overall utility plan shall be clearly visible on one to two plan sheets, with a
maximum scale of 1”=100’.
The scale of the plans may need to be increased to improve visibility. Construction Note
Callouts shall be shown in the plan view (e.g., manholes, catch basins, etc.).
The more detailed Utility sheet(s) shall have the applicable items identified below:
Water
Water system design shall be in accordance with Chapter 7 – Water Facilities, and
shall include the following items:
A. Water pipe and fitting size, location, and type of material.
B. Details of connections to existing water mains.
C. Valve size, locations and type.
D. Fire hydrants locations.
E. Air/vacuum relief valve and blow-off locations.
F. Pressure reducing stations and associated valves, vaults and by-pass piping
as required.
G. Concrete blocking, mechanical or flanged joint, or restrained joint or locking
gasket.
H. Water main, water meter, and fire hydrant easements.
I. Meter size and service line size, material type, and location.
J. Irrigation meter size and service line size, material type, and location.
K. Proposed fire line, FDC line, and PIV locations. Provide a note with the
underground fire line noting that a separate fire permit will be required for the
Issued January 2022 City of Auburn
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underground fire line between the connection to the public water main to the
building.
L. Backflow prevention assembly and detector check meter size, type and
location.
M. For buildings requiring fire sprinklers, the fire sprinkler notes shall be shown
on the plan, as shown in Appendix B of this chapter.
N. Table or call out showing physical separation in feet between water lines
and other utilities at crossings, when a profile is not required.
O. Cross connection control notes included in Appendix B of this Chapter.
P. For plat or road projects, provide unique stationing down the center of the
road with the appropriate offset at all water main appurtenances. For all
other projects, provide unique stationing down the center of the water main
tied into known survey control.
Sanitary Sewer
Sanitary sewer system design shall be in accordance with Chapter 8 – Sanitary
Sewer and Storm Drainage Facilities, and include the following items:
A. Sanitary sewer pipe size, locations, and type of material.
B. Location of manholes. Indicate type of manhole, stationing, offset, and
number manholes consecutively. During the City review process, manhole
numbers shall be assigned by the City to be incorporated into the next
submittal.
C. Indicate knockouts in manholes for future connections.
D. The direction of sewage flow shall be indicated with an arrow at the manhole.
Proposed sewer shall have solid arrowheads while existing pipe and
manholes shall be shown in ghost or screened lines with the arrowhead and
manhole not filled. The location of the frame and cover on the manhole,
positioned over the widest part of the shelf and not over a flow channel, shall
be shown.
E. Drop manholes, if approved, are to be detailed on the plans.
F. Length, slope, type and class of material, and inverts for side sewers.
G. Stationing for side sewers from downstream manholes.
H. Connection of a side sewer to the City’s sanitary sewer pipe shall be
indicated with a tee.
I. Locations of sanitary sewer cleanouts.
J. Locations of sanitary sewer easements.
K. Clearly define right-of-way and adjacent property lines. Parcel numbers for
all lots adjacent to the improvements shall be indicated, with existing or
proposed finished floor elevations.
L. Floor drains, drains from other covered areas potentially subject to
pollutants, and wash areas within parking lots shall be connected to the
sanitary sewer through an approved oil/water separator.
Issued January 2022 City of Auburn
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Storm Drainage
Grading and Storm Drainage system design shall be in accordance with Chapter 5 – TESC,
Clearing, and Grading, and Chapter 8 – Sanitary Sewer and Storm Drainage Facilities
(which incorporates by reference the SWMM), and include the following applicable items:
A. The layout of all the storm drainage pipes with the length, slope, and material type
indicated in the labeling of the storm drainage pipes. Provide arrows to indicate the
direction of flow into the structures.
B. Typical ditch section.
C. Location of manholes and catch basins. Indicate type, stationing, offset, rim and
invert elevations, and number manholes and catch basins consecutively.
D. Existing and proposed sanitary sewers and water mains. Identify crossings and
minimum distance between utilities.
E. Building downspouts or footing drain locations, inverts and connections to the storm
drain system.
F. For single-family home sites, indicate means for collection and discharge of water
from roof, foundation drains, and driveways.
G. Provide arrows to indicate drainage direction in parking lots, roadway intersections
and cul-de-sacs.
H. Reference to the detail/BMP and/or cross-section sheets for storm drainage
detention or retention facilities such as the control discharge structure and pond
cross-sections. Indicate water surface elevations, allowable discharge rates, and
design storms.
I. Show an emergency overflow to the public storm drainage system.
J. Berm dimensions, material, and compaction requirements for ditches and detention
ponds where applicable.
K. Indicate type of material and size of energy dissipaters (riprap, etc.).
L. Provide details of the storm drainage water quality facility.
M. Limits of surface water ponding within parking lots.
N. Trash racks as applicable.
O. Location and widths of easements.
P. Location and type of pumps, if applicable.
Q. Stormwater treatment/quality control facility location, length, width, slopes, and
cross-section.
R. Planting and seeding requirements with establishment procedure (construction
sequence) for water quantity or quality systems.
S. Finish floor elevations of all buildings.
T. Indicate separation from any pipe, infiltration trench, open ditch, water quality and
stormwater facilities to any property line, structure and obstruction.
U. For ponds, provide: landscaping, fencing, empty power conduits for potential future
aeration system, maintenance access, critical water surface elevations, and other
items, such as walls and liners.
Issued January 2022 City of Auburn
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V. Number the storm drain structures. (Numbers will be provided by the City prior to
final plan approval.)
W. Low Impact Development (LID) facility location, length, width, slopes, and cross-
section.
X. Provide the Auburn Storm Drainage Notes as shown in Appendix B of this chapter.
3.04.08 Utility Profile Sheet
Utility Profiles are to be included on the associated utility plan sheet(s) with plan view above
the profile view and corresponding unique stationing. All existing and proposed parallel
and crossing utilities shall be shown on the profile.
Storm Drainage
Profiles shall be created for all designed storm systems. These profiles are to
include the following items where applicable:
A. Public storm drainage located within the street right-of-way shall be shown
on the street profile. See Section 3.04.09.
B. Public storm drainage located in an easement shall have separate profiles.
C. Structure size, location, type, station, invert elevation, type of lid or grate, rim
elevation, stationing and offset.
D. Pipe size, type of material, slope (ft./ft.), and lineal footage.
E. Utility crossings shall identify size and type of utilities involved.
F. Ditches where applicable, size, type and slope.
G. Existing and finished grade along pipe centerline.
H. Connections to existing structures.
Water
Profiles shall be provided for all public water systems, including on-site systems and
systems within the street/City right of way and easements, These profiles shall
include the following items where applicable:
A. Water line located within the street right-of-way shall be shown on the street
profile. See Section 3.04.09.
B. Pipe size, type of material, lineal footage, cover, stationing and offset.
C. Utility crossings shall identify size and type of utility involved.
D. Existing and finished grade along pipe centerline.
E. Connections to existing mains and fittings.
F. Label fittings and valves include blocking.
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Sanitary Sewer
A profile will be required for all public sanitary sewer mains. These profiles are to
include the following items where applicable:
A. Sanitary sewer located within the street right-of-way shall be shown on the
street profile. See Section 3.04.09.
C. Structure size, location, type, station, invert elevations, type of lid, rim
elevation, stationing and offset.
D. Pipe size, type of material, slope (ft./ft.), and lineal footage.
E. Utility crossings shall identify size and type of utility involved.
F. Existing and finished grade along pipe centerline.
G. Connections to existing structures.
H. Side sewer locations, stationing and offset.
3.04.09 Public Street Plan and Profile Sheet
Whenever a project includes construction within a public street, excluding utility
connections, both a plan and a profile shall be included in the plan set. The Public Street
Plan and Profile sheet(s), when required, shall have the applicable items identified below:
Plan View
The plan view shall include the following items where applicable:
A. Plan views shall be drawn at a 1” = 20’ scale.
B. Existing and proposed rights-of-way.
C. Existing and proposed contours and elevations.
D. Existing and proposed street names.
E. Existing and proposed centerline bearing and distance.
F. Existing and proposed signs and traffic control devices.
G. Existing and proposed storm drainage systems.
H. Existing and proposed sewers and water mains. Identify crossings and
minimum distances between utilities.
I. Horizontal curves.
J. Horizontal stationing.
K. Location of curbs, sidewalks, wheelchair ramps, and driveways (by station).
L. Locations of monuments at all centerline intersections, cul-de-sacs, PCs,
and PTs by station.
M. Street luminaires, conduit for streetlights, traffic signals, and traffic signal
loop detectors located within the vicinity of the project.
N. Mailbox types and locations for plats and short plats. Submit to postmaster
for approval.
O. Address any horizontal utility conflicts in plan.
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P. Street landscaping, if required.
Q. Construction limits.
R. Slope excavation and/or embankment limits.
S. Pavement and lane tapers.
T. Identify any non-standard street cross slopes.
U. ADA Maximum Extent Feasible (MEF) documented on the Plans with a
notation indicating the deficiency and that the curb ramp was designed to the
MEF.
V. All proposed and existing underground and overhead utilities shall be shown
and labeled on the plan in gray scale. The locations shall be coordinated and
approved through the appropriate utility purveyor.
Profile
The profile shall include the following items where applicable:
A. Profiles shall be drawn using 1” = 20’ horizontal and 1” = 2’ vertical scales.
B. Existing and proposed centerline road grade.
C. Existing and proposed storm drainage systems.
D. Existing and proposed sewers and water mains (use ghost lines). Identify
crossings and minimum distances between utilities.
E. Existing and proposed flowline grades.
F. Finish grade elevations every 50 feet and every 25 feet for vertical curves
along design centerlines.
G. Vertical curve information in profile section.
H. Address vertical utility conflicts in profile.
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Intersections
Intersection plans shall be 20 scale drawings in conformance with Figure 3-1 below:
Figure 3-1 Intersection Plan Sheet Requirements
Typical Roadway Sections
Typical roadway sections shall show pavement depths, widths and materials,
cross-slopes of pavement (%), centerline, dimensioned right-of-way lines, curb and
gutter, ditches, embankment and excavation slopes (1:1), walls, etc. Typical
sections will be labeled within identified station ranges.
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Striping and Signing
Provide maximum 40 scale plans per these Standards, WSDOT and MUTCD,
including lane markers, pavement markings, and signing.
Signalization
Provide 20 scale separate detailed signalization plan per City of Auburn Standards,
including poles, bases, conduits, and traffic loops.
Signal Plan Sheet
1. The plan sheet shall conform to the following requirements:
a. For areas that require greater detail (such as the corner that has the
controller), a blown-up detail may be necessary at a 1″=10′ scale.
b. All proposed signal equipment, including signal poles, mast arms,
heads, signs, junction boxes, conduit, loops, controller, and service
cabinet shall be shown as bold.
c. All existing and proposed right-of-way information shall be shown and
labeled on the plan, including easements needed for signal equipment.
The line type shall be different for easements and right-of-way.
d. All proposed curb, sidewalk, proposed striping, and existing
curb/striping (to remain) information shall be shown on the plan in gray
scale (screened back).
e. Sight triangle lines shall be shown on plans in gray scale.
f. All proposed and existing underground and overhead utilities shall be
shown and labeled on the plan in gray scale.
g. Provide on the plan signal construction notes as shown in Appendix B
of this chapter.
2. Construction notes shall contain, but not be limited to:
a. Signal pole and foundation installation (including pole type, mast arm
length, and installation of items on the pole).
b. Controller cabinet and foundation installation.
c. Coordination of utility removal/relocation.
d. Coordination of connection of power, and power source type.
e. Interconnect connection to other signals.
f. Removal of existing signal and/or street light equipment.
3. Displays: The plan sheet shall include the following displays:
a. Phase diagram display.
b. Signal display showing signal layout of all vehicle signal heads and
pedestrian heads.
4. Detection: The plan sheet shall include:
a. Stop bar, intermediate and advanced loop location and numbering.
b. Pedestrian push button location.
c. Preemption detection location and numbering.
5. Signal Poles and Associated Equipment: The plan sheet shall contain,
but not be limited to:
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a. Signal Pole Locations and Numbering: The locations shall be called
out by the major arterial station and offset.
b. Signal head location and numbering.
c. Pedestrian head location and numbering.
6. Controller and Service Location:
At least one corner of the controller/service foundation shall be called out
by the major arterial station and offset. The footprint of the foundation
shall be shown on the plans with the controller and service cabinets
oriented on the foundation as they would be placed in the field. If the
information required to show all the controller/service conduit connections
and foundation footprint makes the plan too cluttered, a blown-up detail of
the corner containing this information is needed at a 1″=10′ scale.
7. Power Source Location:
The location of the power source shall be identified on the plans.
8. Wire Schedule:
a. A wire schedule table shall include run numbers, conduit size, wire
type, and comments.
b. Comments shall include, but not be limited to, number of twisted loop
pairs for runs between the detection loops and adjacent junction box,
identification of spare conduits, conduits utilized only by interconnect
or illumination, and power cables.
c. For designs that include modifications to an existing signal, all
existing wire runs affected by the design shall be shown on the wire
schedule.
9. Junction box type and approximate location.
10. Signing:
a. Signs shall be shown on all mast arms. Signs that are post mounted
but are signal related (such as a “signal ahead” sign) shall be shown
on the signal plan.
b. A sign display shall be shown on the plan with the MUTCD sign
designation, dimensions, and lettering type for all signs.
c. Indicate removal of existing stop signs after signal is in operation.
d. Installation of “New Signal Ahead” or “Signal Revision Ahead” signs.
11. Other Illumination:
a. Proposed illumination that will use the signal service cabinet, but is
located outside the four quadrants of the intersection, shall be shown
as proposed on a separate illumination plan sheet. On the signal plan
sheet, the illumination shall be shown as gray scale and labeled as
“proposed illumination, see illumination plans.” However, once the
illumination enters the quadrants of the intersection (i.e., when it is
using the same junction box as the signal equipment), it shall be
shown as proposed on the signal plan and gray scale on the
illumination plan.
b. Indicate the circuit that street lights are on.
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Wire Diagram Plan
In general, the wire diagram shall include the following:
1. All signal heads, pedestrian heads, pedestrian push buttons, luminaires,
preemption detectors, loops, and junction boxes drawn in schematic
forms.
2. All termination points in the controller cabinet. The wire diagram shall
include every termination point the controller will have, including those
that may not be used for this particular signal design.
3. All wiring associated with the items above, as well as the wiring for
interconnect. The wire diagram shall show how these items are
connected to the controller.
4. Location of wire splices.
5. All termination numbering at each end of each wire. For example, the 5-
conductor cable connecting a signal head to the controller shall have the
termination numbering called out at the signal head and in the termination
points in the controller.
6. All wire colors at each end of the wire.
7. A call out to each wire run noting the number and type of each wire.
8. Intersection schematic with a north arrow showing approach phase.
9. Pole, signal head, pedestrian head, preemption detection, and loops shall
be numbered on the wire diagram.
Pole Schedule Plan
The pole schedule shall include the following:
1. The pole schedule shall include a signal standard detail chart.
2. The pole schedule shall include pole orientation attachment and base
detail, pole foundation detail, and signal standard detail.
Illumination
Street Light Plans shall be labeled as Street Light Plans, and shall be prepared,
stamped, signed and dated by a professional engineer.
Street Light Plans will include references to all applicable City of Auburn Standard
Details and/or Washington State Department of Transportation (WSDOT) Standard
Plans, or copies of other specific details applicable to the project shall be shown on
the plans.
Issued January 2022 City of Auburn
Engineering Design Standards Page 46
Plans should show any proposed street trees and underground utilities in the
background.
Street Light Plans shall be provided on separate and uncluttered sheets that do not
show unrelated street, utilities, or on-site improvements. Street Light Plans shall be
drawn to a maximum engineer’s scale of 1” = 40’.
Street Light Plans shall at a minimum include the following applicable items for new
or existing street lighting system:
A. Lighting schedule with the following information in a table format:
1. Luminaire make and model
2. Lamp/Ballast type
3. Lamp wattage
4. Uniformity Ratio
5. Minimum Light Level
6. Average Maintained Light Level
7. Light standard type
8. Mounting height (ft.)
9. Bracket or davit arm length (ft.)
10. Light distribution pattern
11. Luminaire spacing distance (ft.)
12. Light standard locations by station and offset from the centerline of the
street to the center of the light standard. Show all existing street lights for
a distance of 500 feet in both directions from the limits of the project site,
including both sides of the street(s) and in medians.
B. Wiring/Conduit schedule with the following information in a table format:
1. Circuit number
2. Conduit size, material, and purpose (street lighting, traffic signal
interconnect, spares, etc.).
C. Location of points of service (the PSE connection or service location and
the new or existing City Electrical Service Cabinet(s).
D. Location of junction boxes. Indicate junction box type and purpose
(lighting, traffic signal, etc.).
E. Existing topography, including but not limited to the location of driveways,
street trees (including species), street intersections, overhead utilities
(including maximum and minimum heights), underground utilities (including
sizes), medians, curb, and lane widths (pavement markings).
Streetscape
Provide information on planting of the public landscape strips along the street
frontage. Information shall include the following:
A. Type and size of trees.
Issued January 2022 City of Auburn
Engineering Design Standards Page 47
B. Tree spacing.
C. Type of ground cover.
D. Root control/barrier.
E. Irrigation if applicable.
F. Show all proposed and existing surface features and underground utilities.
Other Features
Include locations of any other feature including mailboxes and bus stops. Any
mailbox placement that requires approval from the postmaster shall include the
Postmaster approval block B-2 as shown in Appendix A of this chapter.
3.04.10 Site and Landscape Plan Sheet
The site and landscape sheets (separate plans may be more appropriate), when required,
shall have the following applicable items:
A. Demonstrate conformance with Auburn City Code 18.50, “LANDSCAPING AND
SCREENING” and Auburn City Code 18.52 “OFF-STREET PARKING AND
LOADING”.
B. Label name, classification, and boundary of adjacent streets both public and
private.
C. Pavement types with unique hatching.
D. Site signage and striping
E. The boundaries and dimensions of site.
F. Show and label any easements.
G. Show and label any critical areas and buffers affecting the site.
H. The location of on-site buildings and their eaves or protrusions (decks, porches,
covered entries, etc.) and other site features (generators, compressors, retaining
walls, fuel tanks, etc.).
I. The location of on-site parking stalls, drive aisles, and loading/unloading areas and
required fire lanes with dimensions.
J. The location and size of landscape areas (measured to the inside of curbs).
K. Landscape area calculations as required by Auburn City Code 18.50.040,
“Landscape development standards”
L. The species (common and scientific name), condition (bare root, balled & bur
lapped) or containerized) and size of planting materials (shown within a “planting
schedule”).
M. Notation of which species are native to, or adapted to the Pacific Northwest
(minimum 50%)
N. Site preparation specifications (removal of construction debris, soil amendment,
fertilizer, etc.)
O. The location and type of non-vegetated groundcovers such as rock, mulch, etc.
Issued January 2022 City of Auburn
Engineering Design Standards Page 48
P. The location, size, and proposed screening of outdoor storage areas and
dumpster/refuse areas.
Q. The location, species, and size (diameter at DBH) of all existing trees and measures
to protect them.
R. Show all proposed and existing surface features and underground and above-
ground utilities affecting the site.
S. Landscaping notes, including:
i. Plant materials list substitutions requiring city approval and possibly “as-built
plans”.
ii. Planting notes (e.g., when to remove tree stakes).
iii. Soil quality and installation.
iv. Maintenance after installation.
T. Site furnishings such as light posts, bike racks, benches, trash cans, and shopping
cart racks.
3.04.11 Site Irrigation Plan sheet
The site irrigation sheets, when required, shall have the following applicable items:
A. The connection point to the City system, together with the water meter size.
B. The size, location, and type of the backflow prevention.
C. The proposed layout of the irrigation system.
D. Be consistent with the site’s building and landscaping plans.
E. Show the existing and/or proposed location of all parcel lines.
3.04.12 Critical Area Restoration/Mitigation
A critical area restoration or mitigation sheet, when required, shall include the items as
required by the City pursuant to Auburn City Code 16.10 and 15.68.
3.04.13 Phasing Plans
Applications that propose to complete projects in phases shall submit a phasing plan
which incorporates all required conditions of approval and details infrastructure
improvements and sequencing of the phases. Prior to occupancy of any buildings within a
phased project, complete construction, inspection, acceptance, and transfer of ownership
to the City via Bill of Sale as well as recorded easements are required for all public utilities
(water, sewer, & storm) serving the building and public road improvements/right of way
dedications must be complete. If the private utilities are proposed to be constructed in
phases, the points of connection between phases and how the future phases will be
constructed without affecting the operation of the previous phases must be shown.
Phasing plans are subject to approval by the City Engineer and Building Official and shall
include the following information:
1. Illustrative maps for each proposed phase which clearly mark in heavy lines the
boundaries of the subject phase, label the phase alphabetically (to avoid confusion with
Issued January 2022 City of Auburn
Engineering Design Standards Page 49
lot numbers), and depict roads, lots, infrastructure, easements, dedications and open
space which are included within the subject phase. The plan shall also illustrate those
proposed improvements which mitigate impacts associated with the unbuilt portions of the
project which are not located within the boundaries of the subject phase. Previously
established phases, including roads, lots, infrastructure, easements, dedications, and
open space, should be shown on the map shaded or gray-scaled. All phasing maps shall
be drawn at the same scale.
2. A narrative description or table which describes each phase and its associated
improvements. In addition, the narrative or table shall demonstrate that each phase would
comprise a “stand-alone” development which, should no subsequent phases be
constructed, would meet or exceed City standards and all other conditions of approval.
The narrative should also describe the proposed timeline for completion of the entire
project. The narrative must address emergency access, street improvements, and
alternative construction access.
Issued January 2022 City of Auburn
Engineering Design Standards Page 50
Appendix A – Approval Blocks
Sample Approval Block (B-1):
Sample Postmaster Approval Block (B-2):
Sample Engineering Approval Block (B-3):
PROJECT REF: __________________________
THESE PLANS ARE APPROVED FOR
CONFORMANCE WITH THE CITY OF AUBURN’S
REQUIREMENTS.
DEV. REVIEW ENGINEER: ________________
DATE APPROVED: _______________________
CITY OF AUBURN POSTMASTER APPROVAL
APPROVED BY: ________________________
TITLE/POSITION: _______________________
DATE APPROVED: ______________________
Issued January 2022 City of Auburn
Engineering Design Standards Page 51
Appendix B – Standard Notes
The following General Notes shall apply to Development projects:
GENERAL NOTES
1. CONSTRUCTION SHALL CONFORM TO THE CITY OF AUBURN’S ENGINEERING
DESIGN AND CONSTRUCTION STANDARDS, EXCEPT AS OTHERWISE APPROVED
BY DEVIATION, AND BE IN ACCORDANCE WITH THE APPROVED PLANS. ANY
CHANGES FROM THE APPROVED PLAN WILL REQUIRE APPROVAL FROM THE
OWNER, ENGINEER OF RECORD, AND THE CITY.
2. ALL WORKMANSHIP AND MATERIALS SHALL CONFORM TO THE “WASHINGTON
STATE DEPARTMENT OF TRANSPORTATION (WSDOT) STANDARD
SPECIFICATIONS FOR ROAD, BRIDGE, AND MUNICIPAL CONSTRUCTION
(CURRENT EDITION),” EXCEPT WHERE SUPPLEMENTED OR MODIFIED BY THE
CITY’S CONSTRUCTION STANDARDS MANUAL. THE ABOVE DOCUMENTS SHALL
BE AVAILABLE AT THE JOB SITE DURING CONSTRUCTION.
3. A PRE-CONSTRUCTION MEETING SHALL BE REQUIRED PRIOR TO THE START OF
ALL CONSTRUCTION. CONTACT THE PUBLIC WORKS DEPARTMENT AT 253-931-
3010, TO SCHEDULE A MEETING.
4. UNLESS STATED OTHERWISE, LOCATIONS SHOWN FOR EXISTING UTILITIES ARE
APPROXIMATE. THE CONTRACTOR IS CAUTIONED THAT OVERHEAD UTILITY
LINES MAY NOT BE SHOWN ON THE DRAWINGS. IT SHALL BE THE
CONTRACTOR’S RESPONSIBILITY TO DETERMINE THE TRUE ELEVATIONS AND
LOCATIONS OF ALL UNDERGROUND UTILITIES AND THE EXTENT OF ANY
HAZARD CREATED BY OVERHEAD UTILITY LINES. IDENTIFICATION, LOCATION,
MARKING, AND RESPONSIBILITY FOR UNDERGROUND FACILITIES OR UTILITIES,
IS GOVERNED BY THE PROVISIONS OF CHAPTER 19.122 REVISED CODE OF
WASHINGTON (RCW). PRIOR TO STARTING CONSTRUCTION, THE CONTRACTOR
SHALL CALL ONE-CALL (811) FOR UTILITY LOCATIONS (WATER, SANITARY
SEWER, STORM SEWER, GAS, POWER, TELEPHONE, AND CABLE).
5. IF A PROPOSED ROUTE IS NOT INCLUDED ON THESE PLANS, A PROPOSED
ROUTE AND SCHEDULE FOR HAULING MATERIAL TO THE SITE SHALL BE
SUBMITTED TO THE CITY FOR APPROVAL PRIOR TO THE START OF
CONSTRUCTION. IF THE CITY BELIEVES THAT THE PROPOSED HAUL ROUTE
WILL ADVERSELY IMPACT THE STREET NETWORK, A SEPA AMENDMENT MAY BE
REQUIRED TO EVALUATE THE IMPACTS AND DETERMINE MITIGATION
REQUIREMENTS BEFORE BEGINNING WORK. HAULING MAY BE LIMITED TO
APPROPRIATE OFF-PEAK HOURS OR ALTERNATIVE ROUTES, AS DETERMINED
BY THE CITY.
6. THE CONTRACTOR SHALL BE RESPONSIBLE FOR PUBLIC SAFETY ON AND
AROUND THE PROJECT. PRIOR TO THE START OF WORK, ALL METHODS AND
EQUIPMENT USED FOR TRAFFIC CONTROL AND STREET MAINTENANCE SHALL
BE SUBMITTED TO THE CITY FOR APPROVAL. CONTRACTORS AND THEIR
SURETY SHALL BE LIABLE FOR INJURIES AND DAMAGES TO PERSONS AND
PROPERTY SUFFERED BECAUSE OF CONTRACTORS OPERATIONS OR
NEGLIGENCE CONNECTED WITH THEM.
Issued January 2022 City of Auburn
Engineering Design Standards Page 52
7. ALL CONSTRUCTION SURVEYING FOR EXTENSIONS OF PUBLIC FACILITIES
SHALL BE DONE UNDER THE DIRECTION OF A WASHINGTON LICENSED LAND
SURVEYOR OR A WASHINGTON LICENSED PROFESSIONAL CIVIL ENGINEER.
8. CERTIFIED DRAWINGS ARE REQUIRED PRIOR TO PROJECT ACCEPTANCE.
REFER TO THE CITY’S “DEVELOPMENT RECORD CONSTRUCTION DOCUMENT”
HANDOUT.
Issued January 2022 City of Auburn
Engineering Design Standards Page 53
Appendix B – Standard Notes (continued)
GRADING AND EROSION CONTROL NOTES
1. WITHIN THE CITY OF AUBURN, ALL REQUIRED SEDIMENTATION AND EROSION
CONTROL FACILITIES INDICATED ON THE PLANS MUST BE CONSTRUCTED AND
IN OPERATION PRIOR TO LAND CLEARING AND/OR OTHER CONSTRUCTION
ACTIVITIES. THESE FACILITIES SHALL BE MAINTAINED AND UPGRADED, IF
NECESSARY, TO INSURE THAT SEDIMENT-LADEN WATER AND STORM
DRAINAGE RUNOFF DOES NOT IMPACT THE ADJACENT PROPERTIES,
NATURAL DRAINAGE WAYS, OR THE EXISTING CITY STORM DRAINAGE
SYSTEM.
2. THE SOURCES FOR ALL MATERIAL IMPORTED TO THE SITE SHALL BE
APPROVED BY THE CITY.
3. THE STORM DRAINAGE DETENTION (RETENTION IF INFILTRATION SYSTEM IS
USED), SEDIMENTATION AND EROSION CONTROL FACILITIES DEPICTED ON
THE APPROVED DRAWINGS ARE INTENDED TO BE MINIMUM REQUIREMENTS
TO MEET ANTICIPATED SITE CONDITIONS. ADDITIONAL DRAINAGE AND
EROSION CONTROL FACILITIES MAY BE REQUIRED AS SITUATIONS WARRANT
DURING CONSTRUCTION. THE IMPLEMENTATION, MAINTENANCE,
REPLACEMENT AND ADDITIONS TO THESE CONTROL SYSTEMS SHALL BE THE
RESPONSIBILITY OF THE PERMITEE.
4. THE TEMPORARY EROSION CONTROL FACILITIES, INCLUDING ALL PERIMETER
CONTROLS AND THE DETENTION (RETENTION IF INFILTRATION SYSTEM IS
USED), CONTROL PONDS, SHALL REMAIN IN PLACE UNTIL FINAL SITE
CONSTRUCTION IS COMPLETED. AFTER CITY APPROVAL, THE CONTRACTOR
WILL BE RESPONSIBLE FOR REMOVING ALL TEMPORARY FACILITIES.
5. THE CONTRACTOR WILL BE REQUIRED TO WATER THE SITE, AS NECESSARY,
TO REDUCE DUST EMISSIONS AS A RESULT OF CONSTRUCTION ACTIVITY.
6. NO TRACKING IN THE ROADWAY IS ALLOWED. IF SEDIMENT IS TRACKED ONTO
THE ROAD, THE ROAD SHALL BE THOROUGHLY AND IMMEDIATELY CLEANED
BY SHOVELING OR PICKUP SWEEPING. TRANSPORT SEDIMENT TO A
CONTROLLED SEDIMENT DISPOSAL AREA. KEEP STREETS CLEAN AT ALL
TIMES.
7. ALL AREAS OF ACTIVE EARTHWORK WHICH HAVE THE POTENTIAL FOR
EROSION AND SEDIMENTATION IMPACTS ON ADJACENT PROPERTIES,
NATURAL DRAINAGE WAYS, OR THE EXISTING CITY STORM DRAINAGE
SYSTEM MUST BE STABILIZED ACCORDING TO THE FOLLOWING SCHEDULE:
FROM MAY 1 TO SEPTEMBER 30, AREAS AT FINAL GRADE AND THOSE THAT
ARE SCHEDULE TO REMAIN UN-WORKED FOR MORE THAN SEVEN (7) DAYS
SHALL BE STABILIZED. FROM OCTOBER 1 TO APRIL 30 EARTHWORK
ACTIVITIES SHALL BE CONDUCTED IN STAGES IN ORDER TO MINIMIZE SOIL
EXPOSURE. EXPOSED SOILS THAT WILL REMAIN UN-WORKED FOR MORE
THAN TWO (2) DAYS SHALL BE STABILIZED IMMEDIATELY.
Issued January 2022 City of Auburn
Engineering Design Standards Page 54
Appendix B – Standard Notes (continued)
STORM DRAINAGE DETENTION POND NOTES
PUBLICLY-OWNED AND MAINTAINED DETENTION FACILITIES SHALL MEET THE
CITY OF AUBURN SWMM MANUAL VOLUME V, SECTION 12 AND THE FOLLOWING
REQUIREMENTS:
1. ALL POND CONSTRUCTION, LANDSCAPING, AND TEMPORARY IRRIGATION,
IF USED AS NOTED BELOW, SHALL BE COMPLETED PRIOR TO SCHEDULING
AN INITIAL PUNCHLIST INSPECTION. THE GRASS SHALL HAVE SPROUTED
OVER AT LEAST 80% OF THE AREA TO BE SEEDED.
2. PER CITY OF AUBURN STANDARD 6.03.1.J, ALL POND ACCESS RAMPS
SHALL BE CONSTRUCTED WITH A MINIMUM OF 8” COMPACTED BASE
COURSE TOPPED WITH A MINIMUM OF 2” COMPACTED TOP COURSE. THE
POND RAMP SUBGRADE SHALL BE COMPACTED TO A MINIMUM OF 95%
MODIFIED PROCTOR.
3. THE POND SIDE SLOPES SHALL BE SCARIFIED, AND ALL VEGETATIVE AND
CONSTRUCTION DEBRIS AND ROCKS LARGER THAN 2 INCHES SHALL BE
REMOVED PRIOR TO HYDROSEEDING. HYDROSEEDING SHALL BE
APPLIED OVER THE ENTIRE DETENTION POND BOTTOM (OR ON THE
SLOPES ABOVE THE WATER QUALITY ELEVATION FOR WETPONDS) UP TO
THE FENCE LINE OR TO THE MAXIMUM DESIGN WATER LEVEL (OVERFLOW
ELEVATION), WHICHEVER IS HIGHER.
4. THE POND BOTTOM AND ALL INTERIOR SIDE SLOPES PER REQUIREMENT 3
ABOVE SHALL BE HYDROSEEDED WITH THE GRASS MIXTURE PER THE
CITY OF AUBURN SWMM MANUAL VOLUME V, SECTION 12, AND AS LISTED
ON THE LANDSCAPING PLANS.
5. THE NEED FOR WATERING TO ESTABLISH THE HYDROSEEDING WILL
DEPEND ON WHAT TIME OF YEAR THE HYDROSEEDING IS APPLIED AND
HOW LONG IT TAKES FOR THE SEED TO BE ESTABLISHED. IF A
TEMPORARY IRRIGATION SYSTEM IS USED, IT SHALL BE ATTACHED TO
THE FENCE OR PLACED AT LOCATIONS THAT DO NOT INTERFERE WITH
MOWING.
6. THE CONTRACTOR IS RESPONSIBLE FOR WEED CONTROL AND REMOVAL
OF LITTER PRIOR TO PLANTING AND THROUGHOUT THE PLANT
ESTABLISHMENT PERIOD.
7. THE CONTRACTOR IS RESPONSIBLE FOR REMOVING THE TEMPORARY
IRRIGATION SYSTEM PRIOR TO EXPIRATION OF THE 1-YEAR WARRANTY
PERIOD.
FIRE SPRINKLER SYSTEMS NOTES
SPRINKLER SYSTEMS SHALL MEET CITY OF AUBURN STANDARD 7.06.02 AND THE
FOLLOWING REQUIREMENTS:
1. PROPOSED FIRE LINE TO BE SIZED BY A FIRE PROTECTION ENGINEER.
2. BACKFLOW PROTECTION IS REQUIRED ON FIRE SPRINKLER LINES
Issued January 2022 City of Auburn
Engineering Design Standards Page 55
3. A SEPARATE DETAILED PLAN OF THE UNDERGROUND FIRE SPRINKLER
SUPPLY LINE SHALL BE APPROVED BY THE FIRE MARSHAL AND
INSTALLED BY A WASHINGTON STATE CERTIFIED LEVEL “U” CONTRACTOR
IN ACCORDANCE WITH WAC 212-80-010.
4. A POST INDICATOR VALVE SHALL BE INSTALLED ON THE FIRE SPRINKLER
SUPPLY LINE TO ISOLATE THE SYSTEM FROM THE CITY’S WATER SYSTEM
WHEN REQUIRED FOR REPAIR.
5. BLOCKING, PIPING, AND RODDING DETAILS SHALL BE PROVIDED WITHIN
THE SUBMITTAL.
6. APPROVAL OF THE CIVIL PLANS DOES NOT APPROVE THE INSTALLATION
OF THE SPRINKLER SYSTEM SUPPLY PIPING.
CROSS CONNECTION CONTROL NOTES
CROSS CONNECTION CONTROL SHALL MEET THE FOLLOWING REQUIREMENTS:
1. ALL BACKFLOW PREVENTION ASSEMBLIES SHALL BE INSTALLED IN A
MANNER THAT WILL ALLOW PROPER OPERATION, AND IN-LINE TESTING
AND MAINTENANCE.
2. A BACKFLOW ASSEMBLY PERMIT IS REQUIRED FOR ALL ASSEMBLIES
INSTALLED WITHIN THE CITY OF AUBURN, AND/OR THE CITY’S WATER
DISTRIBUTION SYSTEM.
3. BACKFLOW ASSEMBLIES MUST BE ON THE CURRENT WASHINGTON STATE
DEPARTMENT OF HEALTH – BACKFLOW ASSEMBLIES APPROVED FOR
INSTALLATION LIST.
4. BACKFLOW ASSEMBLIES MUST BE TESTED BY A STATE CERTIFIED
BACKFLOW ASSEMBLY TESTER, AND INSPECTED AND APPROVED BY A
CITY OF AUBURN CROSS CONNECTION CONTROL SPECIALIST.
5. UPON RECEIVING APPROPRIATE FEE PAYMENTS AND VERIFYING THAT
REDUCED PRESSURE BACKFLOW ASSEMBLY (RPBA) HAS BEEN INSTALLED
(NOT BY CITY), THE CITY WILL INSTALL THE DOMESTIC METER INSIDE THE
DOMESTIC METER BOX. THE PASSING TEST REPORT FOR THE RPBA MUST
BE RECEIVED BY THE CITY WITHIN 72 HOURS OF THE INSTALLATION OF
THE DOMESTIC METER.
6. UPON RECEIVING APPROPRIATE FEE PAYMENTS AND VERIFYING THAT
DOUBLE CHECK VAULT ASSEMBLY (DCVA) HAS BEEN INSTALLED (NOT BY
CITY), THE CITY WILL INSTALL THE IRRIGATION METER INSIDE THE
IRRIGATION METER BOX. THE PASSING TEST REPORT FOR THE DCVA
MUST BE RECEIVED BY THE CITY WITHIN 72 HOURS OF THE INSTALLATION
OF THE IRRIGATION METER.
7. DOUBLE CHECK VALVE ASSEMBLY (DCVA, NOT BY CITY) TO BE INSTALLED
BY THE CONTRACTOR ONTO THE FIRE SERVICE LINE, THE PASSING TEST
Issued January 2022 City of Auburn
Engineering Design Standards Page 56
REPORT FOR THE DCVA MUST BE RECEIVED BY THE CITY WITHIN 72
HOURS OF THE CONNECTION OF THE BUILDING FIRE SERVICE LINE TO
THE CITY MAIN.
SIGNAL CONSTRUCTION NOTES
1. THE LOCATION OF ALL CONDUIT, JUNCTION BOXES, AND CABINETS
SHOWN ON THIS PLAN ARE FOR GRAPHIC PRESENTATION ONLY AND
FINAL LOCATION SHALL BE DETERMINED BY THE ENGINEER.
2. ALL TRAFFIC SIGNAL AND PEDESTRIAN HEADS AND PUSH BUTTONS
SHALL BE SECURELY AND COMPLETELY COVERED WHILE SIGNAL IS NOT
IN OPERATION.
3. ALL CONDUCTORS FOR SIGNAL HEADS, LOOPS, PEDESTRIAN HEADS,
PUSH BUTTONS AND STREETLIGHTS SHALL BE LABELED IN EACH
JUNCTION BOX.
Issued January 2022 City of Auburn
Engineering Design Standards Page 57
Appendix C – Deviations
Plan Sheet Deviation Call-Out:
DEV-
#
Leader arrow points to deviation location.
DEV-# is the City assigned deviation number
Plan Sheet Deviation Description:
DEV-
#
Description is included with the construction notes on the plan
sheet where the deviation is located.
Description references the Chapter, Section, and Subsection
Number (where applicable) of the Engineering Design or
Construction Standards where the standard that is being
deviated from is
Includes approval date in mm/dd/yyyy format.
Includes a brief description why the deviation allowed as
provided by the City.
SECTION X.X.X OF THE _____________, APPROVED _____.
Issued January 2022 City of Auburn
Engineering Design Standards Page 58
Appendix D – Survey Standards
COA Horizontal Datum & Basis of Bearing Information (Ref RCW 58.09.060; WAC 332-130-
050)
The City of Auburn’s horizontal datum is NAD83(1991), Washington State Plane Coordinates,
North Zone, 4601
Basis of Bearings: Provide the observed or calculated bearing between two existing,
recoverable monuments, along with NAD83(1991) coordinates and an accurate physical
description of the monuments, including type, size and date visited. Clearly depict on the survey
map ties to the project site from the basis of bearings.
For Example:
HORIZONTAL DATUM
NAD83(1991), Washington State Plane Coordinates, North Zone, 4601
Basis of Bearings:
The monumented centerline of 17th Street NE from COA Mon 509-036 at the intersection
of Auburn Way North to COA Mon 509-010 at the intersection of I Street NE = S 89°04’04”
E
COA Mon 509-036 COA Mon 509-010
N: 121004.23 N: 120994.54
E: 1296131.38 E: 1296726.97
DESC: Encased brass disk with “X” DESC: Encased brass disk with punch
COA Vertical Datum & Benchmark Information (Ref WAC 332-130-050)
The City’s vertical datum is NAVD88
Provide Project Benchmark information that includes a physical description of the benchmark,
date visited and elevation. Clearly depict the project benchmark on the survey map. If the
project benchmark is located a significant distance from the project site, it is recommended that
a site benchmark be established in close proximity to the project site and also clearly labeled
and depicted on the survey map.
For example:
VERTICAL DATUM
NAV88
Project Benchmark: COA 509-036 (BM B19)
Brass disk in concrete in monument case at SI of Auburn Way North & 17th St NE
Elevation = 65.99 (NAVD88)
Issued January 2022 City of Auburn
Engineering Design Standards Page 59
Appendix D – Survey Standards (continued)
Issued January 2022 City of Auburn
Engineering Design Standards Page 60
Appendix E – Minor Grading Permit Criteria
Project Thresholds
o Except as approved otherwise by the City Engineer, only projects meeting all of
the following criteria qualify for a Minor Grading Permit Submittal:
The project is located on a single family parcel with an existing home,
and does not include the construction of a new single family home or
the project is a remodel/tenant improvement on a non-residential
project with all work occurring inside the existing building that is not
exempt from a grading permit per ACC 15.74.
The project does not include the construction of public improvements
and right of way dedications.
Project does not construct dwelling units, excluding accessory dwelling
units.
Project does not construct walls that are over 8-feet tall and less than
10 feet from the property line.
Combined cut and fill earthwork is less than 200 cubic yards. Earthwork
is calculated by adding cut and fill quantities together, no net earthwork
volume.
Grading activities do not change existing drainage patterns and are not
within 10-feet of the property line.
Project disturbs less than 1 acre of area.
Total area of new and/or replaced hard surfaces is less than 5,000 SF.
The project is a remodel/tenant improvement on a non-residential
project that is inside of a building that is not exempt from a grading
permit per ACC 15.74.
Submittal Requirements
o Projects meeting the above thresholds are required to submit the following
when applying for a Minor Grading Permit:
A completed Civil Application and Owner Authorization Form from the
Civil Site Improvement Packet. The Civil Plan Review Checklist found
in the packet is not required for a Minor 1 Grading Permit.
Application Fee per the adopted fee schedule
A neat, legible site plan showing the existing and proposed site
improvements, storm drainage system, adjacent public rights of way,
site address, parcel number, and owner’s name.
A Stormwater Site Plan Short Form. A sample Short Form Stormwater
Site Plan Report is available on the City’s Website on the Public Works
Publications & Forms page. A Stormwater Site Plan Short Form is not
required for remodel/tenant improvement projects listed above.
A Construction Stormwater Pollution Prevention Plan Short Form. A
sample Construction Stormwater Pollution Prevention Plan Short Form
is available on the City’s Website on the Public Works Publications &
Forms page.
Additional reports or supporting documentation as requested by the
City Engineer At the discretion of the City Engineer, the project plans
may require a stamp and signature by a Professional Engineer.
All other projects requiring a Grading Permit shall submit a Grading Permit per the Civil Site
Improvement Packet.
Issued January 2022 City of Auburn
Engineering Design Standards Page 61
Appendix F – AutoCAD Layers Standards
• FORMAT: Digital files shall be provided in AutoCAD 2019 (2018 format)
or older “.DWG” format. All support files required to display or plot the
files in the same manner as developed shall be delivered along with
these files. Scanned hard copy drawings using raster-to-vector
conversion will not be an acceptable digital format. AutoCAD files shall be
prepared in accordance with the Layers Standard included in Appendix D,
Chapter 3 of the City of Auburn Engineering Design Standards.
• MEDIA: Digital files shall be submitted via an electronic delivery method
acceptable to the City of Auburn. Disks and/or drives shall be clearly
labeled with the project name, drawing name(s), name of the
drafting/engineering company or individual(s), date, and appropriate City
of Auburn identifiers (e.g., BLD#, FAC#, etc.).
• SPATIAL REFERENCES: Drawings will be at full scale, and shall be
accurately located in State Plane Coordinates Washington North Zone,
4601, and tied to two existing and recoverable City of Auburn horizontal
control monuments. Datum will be noted on the drawings. All drawings
shall use survey control datum NAD 83/91 for horizontal control and
NAVD 88 for vertical control.
• CONTENTS: The digital drawing files shall include, at a minimum, the
following:
- The overall project site plan showing new and existing
construction, property lines, easements, and survey
references.
- New and existing water, sanitary sewer, and storm drainage
elements showing location, size, and material of utility lines
and structures.
- Separate layering showing existing impervious surfaces, new
impervious surfaces, and annotation on the area of each in
square foot units. Layer features for impervious surfaces shall
be created from closed polylines to aid in verifying calculations
of impervious surface area.
• DOCUMENTATION: Final recorded changes shall be clearly reflected
when Certified Record Construction Drawings are processed. Proposed
features shall use the layer names and descriptions given below. Any
layers included that do not meet the descriptions below shall be
accompanied by a detailed list of layers and layer descriptions.
Issued January 2022 City of Auburn
Engineering Design Standards Page 62
Appendix F – AutoCAD Layers Standards (continued)
Proposed Feature AutoCAD Layer Name
Buildings – Polygon C-SITE-BLDG-OTLN
Commercial Fiber – Polyline C-COMM-FIBR
Conduit: Polyline C-COMM-CDNT
Curbs – TBC – Polyline C-ROAD-TBCV
Curbs – Gutter – Polyline C-ROAD-GTTR
Curbs – Flow (TFC) – Polyline C-ROAD-FLOW
Driveways – Polyline C-PVMT-CONC-DRWY
Easements – Polygon C-PROP-ESMT
Fences – Polyline C-SITE-FENC
Power Service Cabinets – Point C-POWR-VALT
Sewer Cleanouts – Point C-SSWR-SSCO
Sewer Laterals – Polyline C-SSWR-LATR
Sewer Mains: Polyline C-SSWR-PIPE
Sewer Manholes – Point C-SSWR-MHOL
Sidewalks – Polygon C-PVMT-CONC-SDWK
Storm Catch Basins – Point C-STRM-STRC
Storm Culverts – Polyline C-STRM-CULV
Storm Manholes – Point C-STRM-MHOL
Storm Pipes – Polyline C-STRM-PIPE
Street Lights – Point C-POWR-LITE
Street Painted Lines – Polyline C-ROAD-MRKG
Traffic Signal Cabinets – Point T-POWR-SGNL-CBNT
Traffic Signal Poles – Point T-POWR-SGNL-POLE
Traffic Signs – Point C-SITE-SIGN
Traffic Vaults T-POWR-VALT
Vegetation – Polygon C-SITE-VEGE
Trees – Point C-SITE-TREE
Utility Poles – Point C-POWR-POLE
Water Auxiliary Equipment –
Point C-WATR-FTTG
Water Hydrants – Point C-WATR-FHYD
Water Laterals – Polyline C-WATR-LATR
Water Mains – Polyline C-WATR-PIPE
Water Meters – Point C-WATR-METR
Water Valves – Point C-WATR-VALV
Wetlands – Polygon C-WETL-DELN
Issued January 2022 City of Auburn
Engineering Design Standards Page 63
4 Report Preparation Requirements
4.00 Preface
This chapter describes how technical engineering reports are to be laid out to meet City
requirements and provide a format that is easy to follow and understand. Reports need to meet
these basic standards in order to move through the review process in an efficient manner.
4.01 General Requirements
The following general requirements shall be met for all technical engineering reports being
submitted for review and approval:
A. All reports and calculations shall be prepared, stamped, signed, and dated by a
professional engineer.
B. The topographic map prepared for the project shall be prepared, stamped, signed, and
dated by a professional land surveyor.
C. All reports and calculations shall be neat, uncluttered, legible, and in conformance with
the requirements herein.
D. All engineering reports shall be bound with the civil engineer’s stamp clearly visible.
E. Reports shall reference City Standards as necessary.
F. All reports shall be provided in electronic format (PDF).
4.02 Report Types and Requirements
The following are basic types of reports submitted as supporting project information. Depending
on the complexity or simplicity of the project and its location, the amount of detail, and the
number and types of reports required will be subject to change. The examples given are the
typical reports required for a standard project, there may be other reports required that are
specific to a particular project.
4.02.01 Geotechnical Reports
Geotechnical reports are required to support the design and construction of various
facilities as specified in the Auburn City Code, these design standards, the SWMM, the
Engineering Construction Standards, and other documents. The geotechnical report format
shall include (at a minimum) the following applicable items:
A. Title page including project name and address.
B. General information, which includes existing site conditions.
C. Site history including any prior grading.
D. Subsurface soil information and conditions including seasonal high groundwater
and impermeable layer elevations. Seasonal groundwater levels shall be
determined using groundwater monitoring well(s) and shall be required where
consideration of groundwater levels is a design consideration.
E. Soil log information and locations of explorations.
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Engineering Design Standards Page 64
F. Soil characteristics including suitability for fill and compaction requirements.
G. Slope stability analysis.
H. Seismic hazards.
I. Geological hazard areas as defined in the Auburn City Code 16.10.
J. Site plan showing the topography and proposed structures and paving.
K. Grading information including depth of cuts and recommended slopes.
L. Recommendations on temporary erosion and sediment control.
M. Conclusions and recommendations for foundations.
N. Appendix with test pit and boring logs.
O. Information on infiltration rates for use in designing low impact design facilities,
retention ponds and infiltration trenches.
P. California Bearing Ratio (CBR) information for pavement design per Chapter 10,
Table 10-5 or AASHTO Pavement Design.
Q. Additional requirements for geotechnical reports are included in Volume I of the
SWMM.
4.02.02 Stormwater Site Plan Report
The Stormwater Site Plan Report shall contain the information as noted in Appendix I-I of
Volume I of the SWMM.
4.02.03 Critical Area Report
A. Title Page including project name, contact information for property owner,
applicant, and preparer, a description of the proposal, site address, and the parcel
number.
B. Identify all local, state, and other critical area related permits/approvals required for
the proposal.
C. Indicate accuracy of the report.
D. Documentation of field work (such as field data sheets, and rating worksheets in
the case of wetlands).
E. Description of methodologies used in the study.
F. Identify and characterize all critical areas including wetlands, streams, water
bodies, buffers, regulatory floodplain, wildlife habitat, groundwater protection
areas, critical erosion hazard areas, landslide hazard areas, seismic hazard and
volcanic hazard areas on or adjacent (within 300 feet of the project boundaries) to
the proposed project area.
G. Provide location and critical area rating/classification (if applicable) and required
buffers based on a professional survey. Provide the classification according to
Auburn City Code 16.10.080, “Classification and rating of critical areas” and
identify the classification according to other agency standards for
which permits/approvals are required.
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Engineering Design Standards Page 65
H. A description of proposed actions, including estimated area of impacts to the critical
area(s), and the impact to buffer(s).
I. An assessment of probable temporary, permanent, and cumulative impacts to the
critical area(s) and buffer(s).
J. Mitigation measures proposed and relationship to applicable mitigation standards.
K. Scaled site plan.
L. Qualifications of person(s) preparing the report.
4.02.04 Traffic Impact Analysis
A. Title Page including project name and address.
B. Executive Summary.
C. Table of Contents.
D. Introduction consisting of a description of the project, location, site plans with
access to city streets, circulation network, land use and zoning, phasing plan,
project developer and contact person, reference other studies.
E. Traffic Analysis to include assumptions, existing and projected traffic volumes,
project trip generations, trip distribution, level of service (LOS), and warrant
analysis.
F. Appendix with all calculations.
G. Information as specified in Section 10.16 of these design standards.
4.02.05 Construction Stormwater Pollution Prevention Plan (SWPPP)
See Section 5.01.03 of these design standards and Chapter 2 of Volume II of the SWMM.
4.02.06 Other Reports
Other reports may be required on a site-specific basis. The specific information required in
these reports shall be determined during the SEPA process or by the department requiring
the report. These reports shall include the following basic items:
A. Title page including project name and address.
B. General information, which includes existing site conditions.
C. Site plan showing the topography, proposed structures, and paving.
D. Conclusions and recommendations.
E. Appendix with collected field information.
Issued January 2022 City of Auburn
Engineering Design Standards Page 66
5 TESC, Clearing and Grading
5.00 Preface
The design of Temporary Erosion and Sediment Control (TESC) clearing and grading plans
shall conform to the requirements herein.
Compliance with these standards does not alleviate the design engineer from using sound
professional engineering practices. The design criteria contained herein are the minimum
acceptable under standard conditions. Special conditions may require more stringent
requirements that will be addressed during the plan review process.
The purpose of these requirements is to provide the design criteria necessary to preserve the
City of Auburn’s water courses; minimize surface and ground water quality degradation; control
sedimentation in creeks, streams, rivers, ponds, lakes, and other water bodies; protect adjacent
and downstream property owners from increased runoff rates which could cause erosion and
flooding; and ensure the safety and stability of City of Auburn’s roads and rights-of-way.
5.01 TESC Design Criteria
5.01.01 Temporary Erosion and Sediment Control (TESC)
TESC design requirements shall meet design criteria requirements as identified in Volume
II of the City of Auburn Surface Water Management Manual (SWMM), and follow City of
Auburn grading requirements.
All TESC measures regardless of design and implementation must meet the latest
Nephelometric Turbidity Units (NTU) test requirements. The City may conduct tests and if
the applicable limits are not met, the project will be halted until such time as it is brought
into compliance.
5.01.02 Temporary Sedimentation Systems
The temporary sedimentation facilities (ponds and traps) shall be defined as the active
storage available a minimum of 1 foot above the seasonal high ground water.
5.01.03 Construction SWPPP
Any project with exposed soil meeting the requirements of the Chapter 2 of Volume II of
the SWMM shall prepare a Stormwater Pollution Prevention Plan (SWPPP). The plan shall
follow the SWPPP Template (available at the Dept. of Ecology’s website) or City of Auburn
Short Form (where approved by the City) from the SWMM.
5.02 Land Clearing
For land clearing requirements see Auburn City Code 15.74 Plans for Land Clearing shall
follow the requirements for Grading.
5.03 Grading
5.03.01 Purpose
The following section establishes the requirements for grading. These requirements do
not supersede nor are they intended to be inconsistent with any landscaping requirement
Issued January 2022 City of Auburn
Engineering Design Standards Page 67
established by the Zoning Ordinance or other City action. A grading permit shall be
required except for the situations described in Auburn City Code 15.74.050 or as listed
below:
A. The City Engineer may approve the broadcasting of less than 500 cubic yards of topsoil,
peat, sawdust, mulch, bark, chips, or solid nutrients used for landscaping or soil
conditioning on a lot, tract or parcel of land during any 24-month period, provided the
finished depth does not increase the grade from the existing grade by more than 8
inches.
5.03.02 Excavations
A. Cut slopes shall generally be constructed no steeper than two horizontal to one vertical
(2:1). The City may approve steeper slopes after a geotechnical analysis is performed
justifying a steeper slope.
B. Cut slopes shall be stabilized by terracing, cat tracking, jute mat, grass sod, hydro-
seeding, or by other planting or surfacing materials acceptable to the City.
C. The City may also require geotechnical analysis for the following:
Slopes with sub-surface or surface water flows.
In areas of questionable soils conditions.
Where the length of the slope requires terracing.
In other situations where slope stability could be in question.
5.03.03 Fills
A. Fill slopes shall generally be constructed no steeper than two horizontal to one vertical
(2:1). The City may approve steeper slopes after a geotechnical analysis is performed
justifying a steeper slope. Temporary fills for preloading of building pads may use a
slope one and one half horizontal to one vertical (1.5:1).
B. Fill slopes shall be stabilized by terracing, cat tracking, jute mat, grass sod,
hydroseeding, or by other planting or surfacing materials acceptable to the City.
C. The City may also require geotechnical analysis for the following:
Slopes with surface water flows.
In areas of questionable soils conditions.
Where the length of the slope requires terracing.
In other situations where slope stability could be in question.
D. A minimum horizontal setback of 5 feet shall be provided between the bottom of any
fill placement and the top of the bank of any defined drainage channel.
E. When filling a site, particular care shall be taken to prevent impeding the existing
upstream surface drainage flow.
Preparation for Fill
Prior to any fill being placed, all vegetation, topsoil and other unsuitable material shall
be removed unless dictated otherwise by the geotechnical engineer. Where fill is being
Issued January 2022 City of Auburn
Engineering Design Standards Page 68
placed on existing slopes of greater than five horizontal to one vertical (5:1), a
geotechnical analysis shall be performed.
Compaction
Fill material shall be placed in lifts of no more than 12 inches and compacted to 90% or
greater of the maximum dry density as determined by ASTM D1557 Modified Proctor
or as directed by the geotechnical engineer.
Slope Easement
Slope easements adjacent to the right-of-way may be required for maintenance of cut
or fill slopes and drainage facilities. Easement shall be from the catch point plus a
minimum of 5 feet, as determined by the City.
5.04 Retaining Walls
Retaining walls that support/retain land outside the public right-of-way will be located outside
the public right-of-way and be owned and maintained by the owner of the land the retaining
wall is supporting. This is typically the case when the public right-of-way is below the grade of
the adjacent property. These walls are considered private walls and subject to Auburn City
Code Title 15. Walls supporting private property that are built with City capital projects may be
considered public or private walls, to be determined by the City Engineer on a case-by-case
basis with general preference that the walls be privately owned and maintained.
Retaining walls that support/retain the public right-of-way will be located within the public right-
of-way and be owned and maintained by the City. This is typically the case when the public
right-of-way is above the grade of the adjacent property. These walls are considered public
walls.
Retaining wall systems with a vertical difference of 30-inches or greater require protective
fencing along the top edge for safety.
Public retaining walls require dedication of easement(s) of sufficient terms and area, in the
opinion of the City Engineer, to allow for access, maintenance, repair, removal, and
reconstruction of the wall. The minimum easement width for this purpose is 10 feet centered
on the wall face and a minimum of 5 feet beyond any and all structural elements behind the
wall. Walls 10 feet and taller require a minimum 15 foot wide easement and maintenance road
along the wall base that is fenced and gated.
5.04.01 Underdrains
Underdrains are required for all retaining walls over 4 feet in height (i.e., concrete walls,
MSE walls, soil nail walls, block retaining walls, etc.).
A minimum 6-inch diameter perforated or slotted drainpipe shall be placed in a shallow
excavated trench located along the inside edge of the keyway. The pipe shall be
bedded on and surrounded by “Gravel Backfill for Drains” (WSDOT/APWA 9-03.12(4))
to a minimum height of 18 inches above the bottom of the pipe. A filter fabric shall
surround the gravel backfill and shall have a minimum of 1 foot overlap along the top
surface of the gravel. The perforated pipe shall be connected to a storm drain system
or to an acceptable outfall.
Issued January 2022 City of Auburn
Engineering Design Standards Page 69
5.04.02 Rock Walls
Rock Walls may be used for containment of cut slopes or fill embankment up to a maximum
height of 8 feet. Rock Walls over 4 feet in height, surcharged, or in areas of questionable
soil stability will require an engineered design. The engineered design shall include a soils
investigation and report by a geotechnical engineer and structural calculations to support
the rockery design.
Rock Size Categories include:
Two-man rocks (200 – 600 pounds) 18” – 28” average diameter.
Three-man rocks (601 – 2000 pounds) 28” – 36” average diameter.
Four man rocks (2001 – 4000 pounds) 36” – 48” average diameter.
The rock material shall be as rectangular as possible. No stone shall be used that does
not extend through the wall. The quarried rock shall be hard, sound, durable, and free from
weathered portions, seams, cracks, and other defects. The rock density shall be a
minimum of 160 pounds per cubic foot, measured accordingly to WSDOT test method 107
(Bulk Specific Gravity – S.S.D. basis).
5.04.03 Block Retaining Walls
Block retaining walls, (e.g., Keystone, Allan Block, Ecology Block) may be used for
containment of cut slopes or fill embankment. Block retaining walls over 4 feet in height,
surcharged, or in areas of questionable soil stability will require an engineered design. The
engineered design shall include a soils investigation and report by a geotechnical engineer
and structural calculations to support the block wall design.
Blocks used for retaining walls shall be in good condition and structurally sound; cracked
and/or broken blocks are not acceptable. Unless designed as a gravity wall (ecology
blocks), block walls over 4 feet in height shall employ geo-grid type material to increase
the structural stability of the wall.
5.04.04 Reinforced Concrete Walls
Reinforced concrete walls or cast-in-place concrete walls may be used for containment of
cut slopes or fill embankment. Concrete retaining walls over 4 feet in height, surcharged,
or in areas of questionable soil stability will require an engineered design. The engineered
design shall include a soils investigation and report by a geotechnical engineer and
structural calculations to support the concrete wall design.
A minimum 3,000-psi structural reinforced concrete shall be used in the design of concrete
retaining walls.
5.04.05 Mechanically Stabilized Earth Walls (MSE Walls)
MSE walls may be used in conjunction with other retaining walls or as a stand-alone
application when constructing fill slopes. MSE walls will require an engineered design.
The engineered design shall include a soils investigation and report by a geotechnical
engineer and structural calculations to support the MSE wall design.
MSE walls shall employ well-draining structural soil compacted to the geotechnical
engineer’s specifications.
Issued January 2022 City of Auburn
Engineering Design Standards Page 70
5.05 Construction Sequence
5.05.01 Requirements
A construction sequence is intended to ensure that the timing and installation of storm
drainage and erosion control measures are in place prior to activities that may cause
erosion to occur. The following elements are to be included in a construction sequence:
A. Establishment of clearing and grading limits.
B. Construction of temporary construction entrance.
C. Construction of perimeter ditches, filter fabric fences, and other erosion control
devices as shown.
D. Construction of storm drainage control (applicant to be specific) facilities including
emergency overflow as applicable.
E. Construction of ditches and swales as necessary to direct all surface water to the
storm drainage control (be specific) facilities as clearing and grading progress.
Prevention of uncontrolled surface water being allowed to leave the site at any time
during the grading operations.
F. Establishment of at what point grading activities can begin, which is usually only
after all perimeter drainage and erosion control measures are in place.
G. For sites with a final development plan, the following shall also be addressed when
applicable:
1. Installation of on-site permanent storm drainage, sanitary sewer, and water
facilities.
2. Site paving.
3. Indicate at what point building construction may begin.
4. A description of how to transition from the temporary to permanent storm
facilities.
5. The possibilities of any phased construction.
6. Any off-site public or private improvements including the general timing and
duration.
7. The removal of all TESC measures at project completion upon City approval.
H. The TESC plan sheet shall also include a construction sequence element which
clearly identifies the timing and methodology required to:
1. Contain areas of active earthwork to prevent uncontrolled discharge of storm
drainage
2. Minimize erosion and the extent and time soils are exposed on-site.
3. Prevent tracking of sediment onto City streets.
4. Protect permanent on-site and off-site storm drainage systems.
Issued January 2022 City of Auburn
Engineering Design Standards Page 71
6 City Utilities Requirements
6.00 Preface
Standards that are applicable to all three public utilities – water, sanitary sewer, and storm
drainage – are described in this section. Additional standards for City utilities are included in
Chapters 7, 8, and 9 of this document and in the Surface Water Management Manual (SWMM).
Chapter 9 describes specific additional requirements for City and non-City facilities, including
utilities, within the public right-of-way.
Compliance with these standards does not alleviate the design engineer from using sound
professional engineering practices. The design criteria contained herein are the minimum
acceptable under standard conditions. Special conditions may require more stringent
requirements that will be addressed during the plan review process.
6.01 Easements
Public Utility Easements are required for the placement, operation, and maintenance of public
utility facilities located outside the public right-of-way and not in tracts/parcels owned by the
City for the specific use of the utility facility. Easements shall encompass all portions of the
utility facilities including, but not limited to, valves, manholes, hydrants, meters, catch basins,
channels, access roads, and other appurtenances. Easement requirements for storm ponds,
ditches, and channels are specified in the SWMM.
6.01.01 Easement Width
Easement widths for City utilities shall provide adequate space for access, operations,
maintenance, repair, and open cut replacements.
Table 6-1 shows minimum required easement widths for City Utility pipes and
appurtenances based on depth of pipe/appurtenance. Under certain circumstances (e.g.,
steep slopes, pipe diameters greater than 12 inches, excessive depths) the City may
require wider easements than shown in the table. Minimum easement widths for non-
pipe facilities and appurtenance, such as channels and ditches, shall be the minimum
width required for the City to access, operate, maintain, repair, and replace the facility
and to meet the other requirements specified herein and in the SWMM.
Table 6-1 Minimum Easement Width for City Utilities
PIPE INVERT DEPTH, FEET EASEMENT WIDTH, FEET
< 10 15
10 – 15 25
15 – 20 30
> 20 40
Issued January 2022 City of Auburn
Engineering Design Standards Page 72
6.01.02 Easement Form
Public Utility Easements shall be provided on the City’s standard easement form, with a
separate easement for each utility. A legal description of the easement and the property
that the easement encumbers, along with a sketch showing both, shall be stamped and
signed by a professional land surveyor and incorporated into the easement form as
exhibits. The legal descriptions and sketch shall be on plain bond paper with margins
acceptable to the County of recording. The easements may also be described and
recorded on a final plat document. Encumbrances that would conflict with the City’s rights
and ability to access, operate, maintain, repair, and replace the utility require
release/clearing from title.
The City will record approved Public Utility Easements in the appropriate County prior to
acceptance of the public facilities, unless part of a final plat document.
6.01.03 Location of Facilities within Easement
Facilities shall be located within the easement as follows:
The preferred location of pipes, channels, structures, and appurtenances is to be
centered within the easement. Where facilities are not centered in the easement,
additional easement width may be required and it shall be demonstrated, to the
satisfaction of the City Engineer, that the placement will not impeded the City’s ability to
access, operate, maintain, repair, and replace the facilities using typical City practices.
The facilities must be located within the easement so that each pipe face or edge of
channel, structure, or appurtenance is no closer than 5 feet from its adjacent easement
boundary.
6.02 Utility Pipe Separation
A. Potable and Non-Potable: The requirements of this section are based on WAC 246-290-
200, Washington State Department of Health (DOH), and the Washington State Department of
Ecology (DOE). Potable pipes include pipes conveying water for domestic purposes, including
domestic service and irrigation service lines. Non-potable pipes include, but are not limited to,
pipes conveying sewage, storm drainage, natural gas, gasoline, and oxygen. Natural gas
service lines, drain pipes (yard drains, down spout drains, and wall drains) are not subject to
the potable/non-potable separation requirements but are still subject to general separation
requirements as specified herein. The following requirements apply to separation between
pipes and appurtenances of potable and non-potable materials:
A Minimum of 10 feet horizontal separation is required between the outside walls/limits
of parallel facilities where the crown of the non-potable pipe is less than 18 inches lower
than the invert of the potable pipe.
A Minimum of 4 feet horizontal separation is required between the outside walls/limits
of parallel facilities where the crown of the non-potable pipe is at least 18 inches lower
than the invert of the potable pipe is required.
The invert of the potable pipe is required to be a minimum of 18 inches above the pipe
crown of the non-potable pipe at crossings.
Where meeting separation requirements would require pumping/pressurization of an existing
or new gravity non-potable pipe, the separation requirements may be reduced with the following
additional requirements:
For construction of new potable pipes, the potable pipe shall be encased with ductile
Issued January 2022 City of Auburn
Engineering Design Standards Page 73
iron or steel pipe designed to withstand a minimum static pressure of 150 psi and
extending at least 10 feet to either side of the crossing per City of Auburn Standard
Detail W-26.
For construction of new non-potable pipes, the non-potable pipe shall be encased in
controlled density fill for at least 10 feet to either side of the crossing.
B. General Separation Requirements: The following separation requirements are in addition
to the other separation requirements specified herein. I placement of new City utility facilities
mains shall be done in a manner that allows the City to access, operate, maintain, repair, and
replace the facilities without impacting other adjacent facilities or structures in the vicinity.
Facilities shall be located a minimum horizontal distance of 10 feet from structures. Except as
noted above (for crossings of potable water), underground facilities that cross each other shall
have a minimum separation of 12 inches. In addition to other separation requirements specified
herein, non-potable facilities require a minimum horizontal distance of 5 feet from all other
underground utilities.
Additional separation of City utility facilities from structures may be required where soil
conditions are poor, facility depth is greater than 10 feet, or other conditions are present that
require additional separation to ensure the City may access, operate, repair, and replace the
facilities using standard City methods. The minimum separation between an underground
facility and an adjacent structure shall be such that the zone of influence from the weight of a
structure shall be below the invert of the underground facility.
6.03 Utility Access Roads
Public utilities within a utility easement, tract, or parcel that have appurtenances such as
manholes, catch basins, stormwater ponds, fire hydrants, valves, blowoffs, etc. shall have an
access road. The access road shall be constructed of gravel, asphalt, pervious concrete or
pervious asphalt, or other surface material as approved by the City Engineer, and shall
conform to the following requirements.
6.03.01 Road Design Requirements
A. Maximum vertical profile shall be 12% for public facilities and 15% for private facilities.
B. A paved commercial driveway apron meeting City design standards shall be required
for both public and private access where access roads connect to paved public
roadways.
C. The beginning of the access road shall not exceed a vertical profile of 5% for a minimum
distance of 25 feet measured from the back of sidewalk or right-of-way line.
D. The minimum access road length shall be 50 feet.
E. Access to the access road shall be limited by a double-posted gate with a minimum
width of 15 feet (if the gate is connected to a fence), removable bollards, or other
approved equal.
F. Except as noted in Section 7.06.04, access roads shall be a minimum of 15 feet in width
on curves and 12 feet in width on straight sections, centered within the easement.
Easement width will need to be increased at curves to accommodate the wider road
and adjacent ditch described below. A hammerhead or a turnaround meeting IFC
standards is required at the end of all access roads, unless drive-through access is
provided.
Issued January 2022 City of Auburn
Engineering Design Standards Page 74
G. Inside turning radius shall be a minimum of 45 feet. Turning analysis may be required
to verify movement of equipment.
H. Access roads whose vertical profile is greater than 8% shall be asphalt paved. See
Chapter 10, Table 10-5 for paved access road requirements.
I. Gravel access roads shall conform to the following requirements:
1. The subgrade and surfacing for gravel roads and stormwater pond access ramps
shall meet the requirements of Chapter 10, Table 10-5.
2. The access road shall have a cross slope of 2%.
3. Access roads will be constructed with appropriate drainage to prevent stormwater
ponding on the road.
J. All pond access ramps shall be constructed with a minimum of 8” compacted base
course topped with a minimum of 2” compacted top course. The pond ramp subgrade
shall be compacted to a minimum of 95% modified Proctor.
K. Access roads cut into a hillside will require regrading of the adjacent slopes. To reduce
the length of unimpeded slope and to collect and reduce the probable impacts of sheet
flow on the slope face, install benches at least 10 feet wide into the slopes adjacent to
the access road, with 30 feet maximum vertical spacing between benches. On the uphill
slope face, the first bench shall be adjacent to the ditch.
Issued January 2022 City of Auburn
Engineering Design Standards Page 75
7 Water Facilities
7.00 Preface
The design and construction of Public Water Facilities shall conform to the State of Washington
Department of Health (DOH) Design Standards for Group A Public Water Systems, the
Standard Specifications of the American Water Works Association (AWWA), and the most
recent published and adopted edition of the Uniform Plumbing Code (UPC), unless modified
herein.
Compliance with these standards does not alleviate the design engineer from using sound
professional engineering practices. The design criteria contained herein are the minimum
acceptable under standard conditions. Special conditions may require more stringent
requirements that will be addressed during the plan review process. Contact the City of Auburn
Engineering Services for specific requirements for the design of pump stations, wells,
reservoirs, treatment systems, and other special facilities.
The design criteria used to estimate future line capacities are established in the City’s
Comprehensive Water Plan. Anyone proposing to extend or modify the City’s water system
should contact the Public Works Department for information. Applicants needing to construct
public water improvements shall enter into a Developer Public Facility Extension Agreement
(FAC) with the City. The City’s Permit Center can provide information on this agreement as
well as applicable permit and connection fee estimates.
7.01 Water Mains and Appurtenances
7.01.01 Extension Requirements
Per ACC 13.08.020, no property shall be served with City water unless the water main
is extended to the extreme boundary limit of the property line extending the full length
of the front footage of the property. All extensions shall extend to and across the full
width of the property served with water.
Water main extensions shall be looped to provide a minimum of two separate
connection points to the existing water system, with sufficient valves so that water can
be delivered through either connection point independent of the other. Such looping
will provide more reliable service and water movement through the distribution system.
Water main extensions that may serve adjacent property or to which adjacent property
may connect future extension(s) require additional easements as determined by the
City Engineer or designee to be needed to accommodate the future connections.
Issued January 2022 City of Auburn
Engineering Design Standards Page 76
7.01.02 Materials
Unless otherwise approved by the City Engineer, all water mains shall be the following:
Pipe Type Construction Standard Notes
Ductile Iron Pipe,
Special Class 52
9-30.1(1) (Ductile Iron Pipe)Asphaltic coating on the
exterior and cement mortar
lining on the interior
The list of acceptable valves, fittings, and other appurtenances for water facility
construction is subject to change as new and improved components become available.
Refer to the City of Auburn’s Construction Standards manual (latest edition) for the most
current information on these requirements.
7.01.03 Water Main Sizing
Public water mains shall be sized using the following criteria:
A. New water mains shall be sized, as indicated in the City's current
Comprehensive Water Plan. For lines not specified in the plan, the mains shall
be sized as described in this subsection.
B. Water mains serving only single-family residential properties shall be a minimum
of 8 inches in diameter, except as noted herein. Subdivision of property for
single-family use triggers the requirement for water main(s) that will provide
water service to the subdivided properties to be re-constructed to meet the
minimum size requirement across the frontage(s) of the original property.
C. Water mains serving properties that are not solely single-family residential use
shall be a minimum of 12 inches in diameter. Any new or up-sized service
connections to a water main triggers the requirement for the water main from
which the new or existing service is taken to be up-sized if it does not meet the
minimum size requirement. When triggered, the main(s) shall be upsized across
the frontage(s) of the property(s) being served.
D. New or upsized water service connections to an existing single-family residential
lot does not trigger the requirement to upsize water mains that do not meet the
minimum size requirement, except as needed to meet minimum fire flow
requirements for the developing parcel.
E. Water mains shall be sized under fire flow conditions, so that flow velocity shall
not exceed 8 feet per second in distribution mains or 5 feet per second in
transmission mains.
F. The minimum allowed diameter of a water main in a cul-de-sac or dead end
street serving only single family residential properties that has been determined
by the City Engineer to not require future extension to serve adjacent or nearby
property may be reduced to 4 inches after the last fire hydrant connection
serving the cul-de-sac or dead end street.
If a conflict arises between two or more of these criteria, the water main shall be
designed using the largest pipe diameter required.
7.01.04 Water Main Location
A. Water mains shall be installed with no less than 42 inches and no more than 72
inches of finished cover. The City Engineer or designee may grant exceptions
Issued January 2022 City of Auburn
Engineering Design Standards Page 77
to the minimum and maximum cover requirements and may require measures
to mitigate impacts of the decreased or increased cover. Said exceptions will
only be considered based on the potential impacts to City utilities of constructing
the water main within the allowed cover ranges and topographic constraints. A
formal deviation request may be required.
B. Water mains shall be located in the public right-of-way or within a public water
utility easement. Water mains within a utility easement with appurtenances such
as hydrants, valves, blowoffs, etc. shall have an access road to such
appurtenances conforming to Chapter 6. Water mains located in the public right-
of-way shall meet the requirements of Section 9.03.
C. For separation requirements between utilities, see Chapter 6.
7.01.05 Water Main Fittings
A. Blowoffs (See City of Auburn Standard Detail W-03 or W-04) are required on
dead-end water mains with a diameter of 6 inches or less; hydrants are required
for dead-end mains over 6 inches in diameter. Blowoffs shall also be installed
at the low point of a depressed “sag” section of a water main, except where a
fire hydrant is installed within 50 feet of said area or on a short segment (20 feet
or less) where the water main dips under other utilities. Blowoffs shall be placed
in a level clear area within the right-of-way or easement, be located as close to
the main as possible, and be easily accessible to the City.
B. Combination air/vacuum release valves (See City of Auburn Standard Detail
W-02) are required at high points in water mains when an abrupt vertical change
in pipe elevation exceeds one pipe diameter, except where fire hydrants are
installed within 50 feet of said area. Combination air release valves shall be
placed within a level clear area within the right-of-way or easement and be easily
accessible to the City.
C. All bends shall have mechanical or flanged joints and concrete thrust blocking
(See City of Auburn Standard Detail W-01). The City may require restrained
joints in lieu of thrust blocking in special conditions.
D. Tees shall have flanged joints unless there is no valve against the Tee, in which
case the Tee may be flanged or mechanical. Tees shall include concrete thrust
blocking (See City of Auburn Standard Detail W-01). When connecting to an
existing public water main, a tapping tee and valve may be used, if only a single
valve is needed at the tee, or unless otherwise approved or required by the City.
E. Tapping tees are not allowed on commercial fire lines or other water taps
needing uninterruptible service; a cut-in tee or installed tee is required.
F. Size-on-size taps are not allowed unless authorized by the City Engineer or
designee.
G. The maximum allowable deflection per joint for ductile iron water mains shall be
half of the maximum joint deflection specified by the pipe manufacturer or 4
degrees, whichever is.
7.02 Water Services
See City of Auburn Standard Details W-06, W-13 through W-16a, and W-20.
Issued January 2022 City of Auburn
Engineering Design Standards Page 78
The City owns and shall maintain the water service line from the public main to the meter,
the meter and setter, the meter radio, the meter tailpiece, and the meter box. The property
owner owns and shall maintain the tailpiece connection fitting, shut-off valve, service line
after the shut-off valve, and other facilities such as pressure reducing valves, pumps, or
backflow prevention assemblies behind the meter.
For fire sprinkler connections, City ownership and maintenance responsibilities cease at
the valve installed at the point of connection between the main and the fire service line.
7.02.01 Domestic Services
Domestic Water Services are defined as any service that connects directly to plumbing
within a structure and is used for drinking, cooking, washing, and other standard uses
of potable water. Domestic water services shall meet the following requirements:
A. Each parcel receiving water service shall have its own meter. Non-single family
developments with multiple buildings on a single parcel shall have a meter for
each building unless otherwise authorized in writing by the City Engineer or
designee.
B. Installation of corporation stops, water services, and meters shall be per City of
Auburn Standard Details. The City may, at the City's option, install services from
public water mains to the meter in existing rights-of-way and easements. The
developer/contractor will install and/or replace all applicable services when
installing new water mains required for the project. The City will furnish and
install the meter for services of 2 inches and smaller.
C. Water meters of 3 inches and larger will be purchased from the City and installed
by the developer/contractor under City observation. Where vaults are required,
the vault roof shall contain a 2-inch port for remote read device.
D. Water meters shall be located in a level unobstructed area not subject to
vehicular parking or travel, and as close to the City main as possible with the
distance not to exceed 50 feet.
E. Residential sites shall have water meters placed in landscape strips within the
right-of-way, set 2 inches above the finished grade including landscaping and
mulch. If no areas are available in the right-of-way that are not subject to vehicle
parking or traffic, water meters may be placed outside the right-of-way in public
water utility easements.
F. Commercial and industrial sites shall have meters located near driveway
entrances within the right-of-way or within public water utility easements in
landscape islands located near access driveways when placement in right-of-
way is not practical.
G. Meters may not be placed within sidewalks or pedestrian travel pathways except
in cases where obstructions prevent the meter box from being placed behind
the sidewalk or in a landscape strip (where a landscape strip is present). In such
conditions, the meter box shall be placed in the sidewalk such that the edge of
the meter box closest to the roadway is no closer than 6-inches to the adjacent
edge of sidewalk. A minimum of 2 inches shall be maintained between meters
boxes.
H. The water service diameter and meter size shall be sized per Tables 610.3 and
610.4 of the current Uniform Plumbing Code and, upon request by the City,
supporting documentation of the meter size selection provided to the City. The
Issued January 2022 City of Auburn
Engineering Design Standards Page 79
length of the service between the meter and the structure shall not exceed 300
feet.
I. When installing multiple services to a public main, a minimum spacing of 2 feet
shall be used between corporation stops, a minimum spacing of 5 feet shall be
used between corporation stops and tapping tees, and a minimum spacing of 5
feet shall be used between tapping tees on existing ductile iron mains and 10
feet on all other types of existing water main materials.
J. Domestic water services shall be connected to a looped distribution main unless
otherwise approved by the City.
7.02.02 Other Services
Irrigation and other non-domestic water services shall meet all the above requirements
as well as the following:
A. An Irrigation meter shall be installed in cases where water is used for landscape
purposes by non-single family customers and does not enter the sanitary sewer
system.
B. For fire sprinkler service line requirements, see Section 7.06.02.
C. Cross connection control devices shall be installed per Section 7.04.
7.02.03 Service Abandonment
Services shall be abandoned when properties are redeveloped and existing meters will
no longer be used. The following actions are required after removal of the meter:
A. Obtain the necessary permits (e.g., for work in the right-of-way, for meter
abandonment)
B. Shut off the corporation stop at the main.
C. Disconnect the service line from the corporation stop.
D. Remove the meter box.
E. Restore the roadway or other surface(s) disturbed by construction activities
(e.g., trench patch/overlay)
7.03 Water Valves
Water valves shall be as specified in the Construction Standards and meet the following
additional requirements:
See City of Auburn Standard Details W-17 through W-19 for valve box and extensions.
7.03.01 Water Valve Sizing
Water valves shall be of the resilient wedge gate variety. Butterfly valves shall be placed
on water mains 14” or larger in diameter. Valves larger than 12 inches require the valve
to be turned with a gear to maintain minimum cover.
7.03.02 Water Valve Location
A. Water valves shall be installed along the water mains at a maximum spacing of
400 feet and at the intersection of lateral lines. A maximum of 20 service
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Engineering Design Standards Page 80
connections between valves shall be maintained except on dead end residential
streets where up to 30 service connections between valves are allowed.
B. Water valves shall be located in clusters at tees and crosses when possible and
shall be located so that each leg of the main line system can be isolated
separately.
C. When extending public water mains, a water valve may be required near the
end of lines where future extensions are projected.
D. Water valves shall not be placed within the wheel path of vehicle traffic.
E. A gravel or paved road surface may be required within the public water utility
easement as needed to allow access to valves and other appurtenances.
F. Valves shall be adjusted to final grade in accordance with City of Auburn
Standard Detail T-05.
7.04 Cross Connection Control
See City of Auburn Standard Details W-22 through W25.
Water Systems shall be designed to protect the City water system from contamination via
cross connection control in accordance with Washington State Law (WAC 246-290-490),
Auburn City Code (ACC), the City’s Cross Connection Control Program manual, and these
design standards. Premises isolation shall be provided on service connections and
proposed building tenant improvements in accordance with these standards.
7.04.01 Domestic Services
A. Backflow protection assemblies shall be installed on all new non-single family
service connections. Backflow protection assemblies shall be installed on
existing non-single family service connections as directed by the City Cross
Connection Specialist. The type of backflow protection assembly shall be as
determined by the City Cross Connection Specialists.
1. A Reduced Pressure Backflow Assembly (RPBA) shall be installed adjacent
to the meter or at an alternate location where the service line enters the
building. RPBA assemblies installed at an alternate location, require the
approval of the City, shall have no connections between the meter and the
assembly, and shall be installed with adequate drainage to accommodate
discharges from the RPBA.
2. A Double Check Valve Assembly (DCVA) for domestic service shall be
installed adjacent to the meter, unless installed at an alternate location
approved by the City Cross Connection Specialists.
7.04.02 Irrigation Services
A. A backflow prevention assembly shall be installed on all irrigation service
connections. The layout of the backflow prevention assembly shall be per City
of Auburn Standard Detail W-06 for single family residential services up to 2
inches and per City of Auburn Standard Detail W-20 for non-single family
residential services. The minimum level of backflow prevention required shall
be provided by a Double Check Valve Assembly (DCVA) per City of Auburn
Standard Detail W-24. A higher degree of protection may be required if deemed
Issued January 2022 City of Auburn
Engineering Design Standards Page 81
necessary by the City Engineer, which may include a Reduced Pressure
Backflow Assembly (RPBA) per City of Auburn Standard Detail W-22.
B. The backflow prevention assembly shall be installed adjacent to the meter.
7.04.03 Fire Line Connections
A. A backflow prevention assembly shall be installed on all fire service connections.
The layout of the backflow prevention assembly shall be per City of Auburn
Standard Detail W-09 for single family residential services up to 2-inches and
per City of Auburn Standard Detail W-20 for non-single family residential
services. The minimum level of backflow prevention required shall be provided
by a Double Check Valve Assembly (DCVA) per City of Auburn Standard
Detail W-24. A higher degree of protection may be required if deemed
necessary by the City, which may include a Reduced Pressure Backflow
Assembly (RPBA) per City of Auburn Standard Detail W-22.
B. The backflow prevention assembly shall be located in the building riser room.
7.04.04 General
A. A DCVA shall be installed to provide adequate access for inspection, testing and
maintenance.
B. A DCVA located outside the building shall be installed in a vault, as described
on City of Auburn Standard Detail W-24.
C. A DCVA located inside the building shall be installed per City of Auburn
Standard Detail W-25.
D. An RPBA shall be installed in an above ground enclosure or at alternate location
with no connections between the meter and assembly (See City of Auburn
Standard Detail W-23). An RPBA is required for all services utilizing chemicals.
E. Prior to installation, 2 sets of backflow prevention assembly plans, including the
connection point to the City main, shall be submitted for review and approval by
the City.
F. Only assemblies listed on the current list of Backflow Prevention Assemblies
Approved for Installation in Washington State shall be allowed. This list is
maintained by the State of Washington and is available from the City.
G. When multiple buildings are proposed on a parcel the building backflow
prevention devices shall all be located outside the buildings or all be located
inside the buildings per City of Auburn Standards.
7.05 Pressure Reducing Stations
A Pressure Reducing Station shall be installed as required between pressure zones to
maintain adequate pressure in the water system. Isolation valves are required upstream
and downstream of the station. Contact the City Water Utility Engineer for specific
requirements, when applicable. Water system design shall be done so as to minimize
the number of pressure reducing stations necessary.
Issued January 2022 City of Auburn
Engineering Design Standards Page 82
7.06 Fire Systems
7.06.01 Fire Hydrant Assemblies
See City of Auburn Standard Details W-07 & W-08.
Fire Hydrant Assemblies shall meet the following requirements:
A. Fire hydrant assemblies shall conform to the standard details listed above.
B. Fire hydrant service lines shall be installed at right angles to 8 inch minimum
diameter supply mains.
C. Fire hydrants shall stand plumb, be set to meet manufacturer’s specification for
ground bury line, and have a clear, level area around the hydrant with a radius
of no less than 60 inches.
D. Fire hydrants shall be located no closer than 50 feet to the surrounding
structures, or at a distance as determined by the Fire Marshal and approved by
the City Engineer. Fire hydrants shall be located such that no portion of the fire
hydrant is within 5 feet of any portion of a driveway (including throat, apron, and
wings).
E. Fire hydrants shall be provided with two 2½ inch National Standard Thread
(NST) hose ports and one 4½ inch NST by 5 inch hose port with a Storz adapter
and cap.
F. The pumper port shall face the street or fire access road and be readily
accessible to any fire vehicle for firefighting and pumping operations. There
shall be at least 18 inches clear from the face of the pumper port to the edge of
pedestrian or traveled ways.
G. The service line from the supply main to the fire hydrant shall be 6 inches in
diameter unless the service line extends over 50 feet in length, in which case
the service line shall be 8 inches in diameter.
H. Fire hydrants shall be installed with a maximum spacing of 600 feet along streets
in single-family zones and 300 feet in all other zones.
I. The maximum distance allowed from any part of a single-family residential
structure to the closest fire hydrant is 450 feet.
J. Buildings, other than single-family residences, located with portions of the
building more than 150 feet in vehicular travel (see figure below) from a fire
hydrant assembly or with building fire flow over 2500 gpm, shall require on-site
fire hydrant assemblies. These hydrants shall be served by a public water main
that loops around the building, or complex of buildings, and reconnects back to
a distribution supply main.
Issued January 2022 City of Auburn
Engineering Design Standards Page 83
7.06.02 Fire Sprinkler Systems
Fire Sprinkler Systems shall meet the following requirements:
A. Any contractor offering to design, install, test, and/or provide maintenance of fire
sprinkler systems in Washington must be licensed with the State Fire Marshal’s
Office, Licensing Section.
B. Fire sprinkler systems shall be required in commercial/industrial and multifamily
buildings according to the adopted fire code regulations. Sprinkler systems may
be required in single-family residences when determined by the City and the
Fire Authority.
C. Fire sprinkler supply lines for commercial buildings, unless designed by a Fire
Protection Engineer, shall be a minimum of 8 inches in diameter.
D. Fire sprinkler supply lines for non-single family buildings shall be connected to
a looped water main.
E. Fire sprinkler supply lines shall be separated from the public water main by a
valve located at the point of connection. The fire sprinkler supply line shall be
installed with a cut-in tee and shall have a 3 valve cluster unless otherwise
approved by the City Engineer.
F. The design of fire sprinkler supply lines for single-family/duplex shall be in
accordance with City of Auburn Standard Detail No. W-09.
G. A Washington State Certified Level “U” contractor shall install underground fire
sprinkler supply lines in accordance with WAC 212-80-010. Prior to installation,
3 sets of underground fire sprinkler supply line plans shall be submitted to the
City for approval by the Fire Marshal. Both a State Certified Level “U” contractor
and a Fire Protection Engineer shall stamp these plans. A letter from a state
certified sprinkler system designer stating “FOR DESIGN PURPOSES ONLY”
may be attached in lieu of a stamp from the Fire Protection Engineer.
Issued January 2022 City of Auburn
Engineering Design Standards Page 84
H. A post indicator valve (PIV) shall be installed on the fire sprinkler supply line
between the public water main and the building. PIV’s shall be located in such
a manner as to be easily visible to Fire Department personnel. A wall-mounted
PIV may be installed when the exterior wall of the building is of non-combustible
construction. A detail containing this information shall be included with the
submitted plans.
I. Fire Department Connections (FDC’s) shall be placed within 50 feet of a fire
hydrant or as directed by the Fire Marshal. FDC’s must be identified and
approved by the Fire Marshal.
J. New water mains shall be constructed with valves on each side of fire line
taps.
K. Fire sprinkler systems shall have backflow prevention in accordance with
Section 7.04.
L. Fire sprinkler service lines shall not be connected to fire hydrant service lines.
M. Flow-through fire sprinkler systems may be installed for single family
residential only. Design shall be according to NFPA 13D. Backflow prevention
is not required for flow-through systems.
7.06.03 Fire Flows
New developments, redevelopment of existing sites, or changes in land use are
required to meet the minimum City fire flow requirements listed below. The developer
shall provide information to the City to define the building specific fire flow requirements.
If the building specific fire flow requirements are greater than the minimums listed
below, facilities shall be designed to meet the greater requirement. The developer is
responsible for providing hydraulic modeling that demonstrates the system meets fire
flow requirements. The developer may request that the City perform the hydraulic
modeling at the applicants cost and the City may or may not agree to provide the
modeling depending on resource availability and other considerations.
The minimum fire flow requirements within Auburn Water Service areas are:
1) Single Family Residential: 1,500 GPM @ 2 Hours
2) Industrial/Commercial/Multi-Family: 2,500 GPM @ 3 Hours
3) Additional fire flow may be required per ACC 15.36A.
Minimum fire flows outside Auburn Water Service areas shall be determined by the
water service provider and the Fire Marshal.
If off-site water system improvements are necessary to meet these requirements, the
Developer shall be responsible for said improvements.
7.06.04 Fire Authority and Hydrant Access
Fire Authority and hydrant access shall meet the following requirements:
A. Access shall be a minimum of 20 feet wide with a minimum vertical clearance of
13½ feet.
B. Access roads shall be designed using a minimum inside radius of 28 feet and a
minimum outside radius of 48 feet.
Issued January 2022 City of Auburn
Engineering Design Standards Page 85
C. Except as noted otherwise in these standards, access that exceeds 150 feet in
length from the face of curb or edge of the existing asphalt of the public road
and does not return to a public road shall provide a turnaround within 150 feet
of the dead-end. If a hammerhead configuration is utilized for the turnaround, it
shall be designed per Figure D103.1 and Table D103.4 in Appendix D of the
International Fire Code. If a cul-de-sac is utilized for the turnaround, it shall be
designed per the City of Auburn Design Standards.
D. Single family residential driveways greater than 150 feet in length from the face
of curb or the edge of the existing asphalt to a location where a single family
home has all portions of the building no more than 150 feet, as measured by an
unobstructed route around the exterior of the building, shall have an 18 foot wide
driveway apron and a minimum 20 foot wide paved surface.
Issued January 2022 City of Auburn
Engineering Design Standards Page 86
8 Sanitary Sewer and Storm Drainage Facilities
8.00 Preface
Compliance with these standards does not alleviate the design engineer from using sound
professional engineering practices. The design criteria contained herein are the minimum
acceptable under standard conditions. Special conditions may require more stringent
requirements that will be addressed during the plan review process.
The City’s Comprehensive Sanitary Sewer Plan and Comprehensive Storm Drainage Plan
establish basins and design parameters used to estimate future line capacities. Anyone
proposing to extend or modify the City’s sanitary sewer system and/or storm drainage system
should contact the Public Works Department for information on proposed line sizes and
locations.
Sanitary Sewer:
The design of sanitary sewer facilities shall be in conformance with the State of Washington
Department of Ecology’s "Criteria for Sewage Works Design" manual (DOE Manual) unless
modified herein. These standards are set forth as a minimum requirement for the planning and
design of gravity sanitary sewer facilities. Sewage pump stations and special facilities are not
included within this design manual due to the complexity of these facilities. When designing
pump stations and special facilities, please contact the City of Auburn Engineering Services for
specific requirements.
In lieu of constructing a public sewer system, the developer of a single, non-residential lot may
construct a private sewer system, in accordance with the standards for public sanitary sewer
systems consisting of manholes and sewer mains. The property owner is responsible for
maintenance and repair of the private system. This option is only available if the sewer
extension would not serve any additional upstream properties. Private sewer systems are not
allowed in the public rights of way except where permitted through franchise agreement or right-
of-way use permit.
Storm Drainage:
These storm drainage requirements provide the design criteria necessary to preserve the City
of Auburn’s water courses; to minimize surface and ground water quality degradation; to control
the sedimentation in creeks, streams, rivers, ponds, lakes, and other water bodies; to protect
adjacent and downstream property owners from increased runoff rates, which could cause
erosion and flooding; to ensure the safety of City of Auburn’s roads and rights-of-way; to
decrease drainage-related damage to both public and private property, and to control runoff
from development, redevelopment and construction sites. The design of storm drainage
facilities shall be in conformance with the City of Auburn Surface Water Management Manual
(SWMM) to comply with the Western Washington Phase II Municipal Stormwater Permit issued
by the State of Washington Department of Ecology.
8.01 Sanitary Sewer and Storm Drainage Mains
8.01.01 Main Sizing/Slope
A. All sanitary sewer mains shall be a minimum of 8 inches in diameter. All storm
drainage mains shall be a minimum of 12 inches in diameter.
Issued January 2022 City of Auburn
Engineering Design Standards Page 87
B. All new mains shall be sized as indicated in the City's current Comprehensive
Plan. For lines not specified in the plan, the applicant must design the line with
sufficient capacity to convey any future flows (based on current land use
designations).
C. Sanitary sewer mains shall be designed and constructed to provide a minimum
cleaning velocity of 2 ft/s when flowing at 80% full. If at final build out the planned
contributing area will not achieve this capacity, additional provisions may be
required.
D. Analysis of storm drainage pipe systems shall be per the requirements of the
SWMM. The following are the minimum slopes for the corresponding pipe sizes:
Pipe Diameter Minimum Slope
8 inch 0.50%
10 inch 0.30%
12 inch 0.25%
18 inch 0.15%
8.01.02 Main Location
A. The desired installation depth for sanitary sewer mains is between 6 feet and 15
feet below the finished surface elevation. For mains less than 6 feet deep and
over 15 feet deep, additional provisions may be required by the City.
B. Mains shall be located in the public right-of-way or within a public utility
easement per Section 6.01. Mains within a utility easement with appurtenances
such as manholes shall have an access road to such appurtenances conforming
to Chapter 6. Mains located in the public right-of-way shall meet the
requirements of Section 9.03.
C. When the potential exists to serve upstream properties, mains shall extend
through the property being served, through the shared driveway or access tract
serving the property(s), or across the entire length of the lot frontage at the depth
necessary to serve the upstream properties, as determined by the City.
D. For separation requirements between utilities, see Chapter 6.
Issued January 2022 City of Auburn
Engineering Design Standards Page 88
8.01.03 Main Material
The following is the City’s list of required sanitary sewer and storm drainage pipe materials
and depth criteria.
Pipe Type Construction Standard Minimum
Pipe Cover**
Maximum
Pipe Depth
Solid Wall Polyvinyl
Chloride (PVC) Pipe,
SDR-21*****
9-05.12(1) (Solid Wall PVC Culvert Pipe,
Solid Wall PVC Storm Sewer Pipe, and
Solid Wall PVC Sanitary Sewer Pipe)
18 inches 22 feet
Solid Wall Polyvinyl
Chloride (PVC) Pipe,
SDR-35 (Requires 13.5
foot lengths.*****
9-05.12(1) (Solid Wall PVC Culvert Pipe,
Solid Wall PVC Storm Sewer Pipe, and
Solid Wall PVC Sanitary Sewer Pipe)3 feet 18 feet
Solid Wall Polyvinyl
Chloride (PVC) Pipe,
C900
9-05.12(1) (Solid Wall PVC Culvert Pipe,
Solid Wall PVC Storm Sewer Pipe, and
Solid Wall PVC Sanitary Sewer Pipe)
12 inches 30 feet*
Ductile Iron Pipe, Special
Class 50
9-05.13 (Ductile Iron Sewer Pipe)6 inches 30 feet*
High Density Polyethylene
Sanitary Sewer Pipe
(HDPE)***
9-05.23 (High Density Polyethylene Pipe
(HDPE))2 feet 30 feet*
Polypropylene Culvert and
Storm Sewer Pipe****
9-05.24(1) (Polypropylene Culvert Pipe
and Storm Sewer Pipe)N/A N/A
* Sanitary sewers deeper than 30 feet will require pre-approval of the City.
** Minimum cover is depth of cover excluding cover depth provided by flexible pavements. No portion
of any pipe shall be allowed within 6 inches of the bottom of the flexible or concrete pavement.
*** The design engineer is responsible for specifying a thickness ratio adequate to withstand
all loads anticipated for this application.
**** For use in Storm Drainage applications only
***** These are the City preferred material types that must be utilized unless depth, loading,
or other conditions necessitate the use of other material types indicated in the table.
8.02 Sanitary Sewer and Storm Drainage Structures
8.02.01 Structure Type and Size
Manholes, Catch Basins, and Inlets shall be constructed per the following:
Type Construction Standard Notes
Manhole (48-inch to 60-inch)WSDOT Standard Plan
B-15.20 with an
eccentric cone
Manhole (72-inch to 96-inch)WSDOT Standard Plan
B-15.40 with a flat top
Issued January 2022 City of Auburn
Engineering Design Standards Page 89
A. Shallow manholes (32”-50” deep) shall conform to City of Auburn Standard
Detail S-06 and may only be used upon approval of the City Engineer.
B. Additional design provisions may be required by the City for manholes over 20
feet deep.
C. Manhole diameters shall meet the following requirements based on the manhole
depth and the size, number, and configuration of pipes entering:
Manhole Diameter
Number & Diameter
of pipes/
Connections
Allowed
Depth of Manhole
48” Diameter
1 Pipe, 21”
2 Pipes, 12” – 18”
3 Pipes, 8” – 10”
4’ Minimum
12’ Maximum
54” Diameter
1 Pipe, 36”
2 Pipes, 21” – 30”
3 Pipes, 12” – 18”
4 Pipes, 8” – 10”
6’ Minimum
15’ Maximum
60” Diameter
1 Pipe, 42”
2 Pipes, 24” – 36”
3 Pipes, 15” – 21”
4 Pipes, 10” – 12”
5 Pipes, 8”
8’ Minimum
20’ Maximum
72” Diameter
1 Pipe, 48” – 54”
2 Pipes, 36” – 42”
3 Pipes, 18” – 24”
4 Pipes, 12” – 15”
5 Pipes, 8” – 10”
8’ Minimum
25’ Maximum
instead of riser
Catch Basin Type I WSDOT Standard Plan
B-5.20
15-inch diameter max. pipe size, 5-
foot max. depth to invert.
Catch Basin Type II WSDOT Standard Plan
B-10.20
Concrete Inlet WSDOT Standard Plan
B-25.60
15-inch diameter max. pipe size, 5-
foot max. depth to invert., only
utilized for single pipe and where a
full depth catch basin is not
feasible.
Cement Concrete Curb and
Gutter Pan
WSDOT Standard Plan
F-10.16
Utilized along curb and gutter
sections.
Rectangular Vaned Grate WSDOT Standard Plan
B-30.30
Utilized for all catch basins along
curb and gutter sections unless in
a sag condition.
Rectangular Frame (Reversible)WSDOT Standard Plan
B-30.10
Utilized for all catch basins.
Combination Inlet WSDOT Standard Plan
B-25.20
Utilized in sag conditions along curb
and gutter.
Issued January 2022 City of Auburn
Engineering Design Standards Page 90
Pipes entering manholes must have a minimum of 8 inches between their
penetrations on the inside of the manhole. (See City of Auburn Standard Detail
S-08)
D. The angle between inlet pipes and the outlet pipe shall not be less than 90-
degrees.
E. Drop manholes are discouraged. When necessary, drop manholes shall be
inside drops conforming to City of Auburn Standard Detail S-05.
8.02.02 Structure Locations
The design of new sanitary sewer and storm drainage conveyance systems shall be
done in a manner that minimizes the total number of manholes and catch basins, using
the following criteria:
A. Manholes shall be installed at a maximum spacing of 400 feet apart along the
main.
B. Manholes shall be installed at all junctions of two or more mains.
C. Manholes are required whenever connecting to a main with an 8-inch or larger
diameter pipe.
D. Manholes or Catch Basins shall be installed at all changes in vertical slope,
horizontal direction, and/or pipe size.
E. In cases where a sewer main steeper than 5% must turn 90-degrees through a
manhole, install a transition manhole at least 20 feet upstream to reduce the
pipe slope to a maximum of 2% and/or to change the angle to 45-degrees.
F. All public sanitary sewer lines shall end with a manhole. All end of the line
sanitary sewer manholes with no side sewers connected directly to them shall
conform to City of Auburn Standard Detail S-07.
G. Sanitary sewer manholes are not to be located within the limits of surface water
ponding or flow lines associated with stormwater runoff.
H. Manhole and Catch Basin covers shall be located outside the wheel paths of
roadways and driveway approaches.
I. Manholes shall not be located within sidewalks, landscape strips trails, or curb
and gutters, except as approved by the City Engineer. In cases where manholes
are located in walking paths, the manhole cover shall be non-skid, smooth top.
J. Sanitary sewer cleanouts are not an acceptable alternative for sanitary sewer
manholes except they may be used with City approval at the end of a sanitary
sewer main, when the future extension of the sanitary sewer main is planned,
and the current end point is not a practical location for a manhole. When
approved by the City, public cleanouts shall conform to City of Auburn
Standard Detail S-03.
K. Manholes shall not be located on portions of streets or access roads with a slope
greater than 8%.
L. Manholes shall be subject to the separation requirements from buildings and
structures specified in Section 6.02.
Issued January 2022 City of Auburn
Engineering Design Standards Page 91
8.02.03 Manhole Parameters
A. Manholes shall provide a minimum of 0.10 foot of drop between the inlet pipe
and the outlet pipe. Pipes of differing diameters shall be aligned so that the
crowns of the pipes match. Where the slope of a pipe entering or exiting a
manhole is greater than 5%, the slope shall be continued through the manhole
and the invert elevations indicated on the plans.
B. Manholes are to be channeled from the entering pipe to the outlet pipe, with the
sidewalls of the channel extended above the top of the largest connected pipe.
See City of Auburn Standard Detail S-08. When making a new connection to
an existing manhole, the manhole shall be rechanneled to match the new pipe
configuration.
C. Manholes set in gravel areas shall be set at the center of a 6-foot concrete apron
flush with the finished grade.
D. Manholes set in landscaped or unimproved areas shall be set 6 inches to 12
inches higher than the surrounding terrain and provided with a 6-foot diameter
concrete apron around the manhole lid.
E. Manhole frames and covers shall conform to City of Auburn Standard Detail
S-04.
F. Manholes shall be adjusted to grade per City of Auburn Standard Detail T-05.
Rubberized adjustment rings may be required in certain circumstances as
determined by the City Engineer.
8.03 Sanitary Side Sewers
See City of Auburn Standard Details S-01, S-02 & S-03.
Side sewers are defined as that portion of the sewer system that extends from 2 feet
outside of the outer foundation wall of the structure to the public sanitary sewer main. The
City maintains the portion of the side sewer located within the right-of-way. The property
owner owns and maintains the portion of the side sewer located outside of the public right-
of-way. Side sewers located within easements are the property owners’ responsibility to
maintain.
Side sewers shall meet the following requirements and shall be laid out per Figure 8-03:
A. A separate and independent side sewer from the public main shall be provided for
each and every parcel. A separate and independent side sewer from the public main
shall be provided for each non-single family building on a parcel.
B. Side sewers within the public right-of-way and side sewers serving non-single family
development shall be a minimum of 6-inches in diameter. The private portion of side
sewers serving single family residences may be 4-inches in diameter within the parcel
that it serves.
C. 6-inch diameter side sewers shall be connected to the public sanitary sewer main by
the use of a tee (City of Auburn Standard Detail S-01) or connected directly to a
manhole located along the public main. All side sewer manhole connections shall
incorporate a channeled or rechanneled manhole.
D. Side sewers with a diameter of 8-inches or greater shall be connected to the sanitary
sewer system by use of a sanitary sewer manhole which shall be channeled or
rechanneled.
Issued January 2022 City of Auburn
Engineering Design Standards Page 92
E. When constructing sanitary sewer mains in new developments, side sewer
installation shall extend from the connection on the main line to the edge of any utility
easements or the public right-of-way, whichever is further.
F. When installing new sanitary sewer mains or replacing existing mains in developed
areas, side sewers shall be installed for all existing occupied structures and any
buildable lots. Side sewers shall extend to the property lines and their location shall
be clearly marked in conformance with City of Auburn Standard Detail S-01.
G. The maximum length of side sewer from the sanitary sewer main to the building shall
not exceed 150 feet except in instances where the side sewer can maintain a 2%
slope, a public sewer extension built to shorten the side sewer would not serve any
other potential customers, and the applicant agrees to additional requirements, such
as but not limited to the installation of additional cleanouts, specified by the City.
H. Side sewers shall be designed and constructed with a minimum 2% slope from the
building to the tee or manhole connection. Where site constraints require that the
slope be less than 2%, the City may require larger diameter pipe and/or additional
cleanouts.
I. When an immediate connection to a building is not being made, side sewers shall be
designed to provide a minimum depth at the property line of 5 feet below the floor to
be served or 6 feet below the street, whichever is deeper. In cases of vacant
properties with no anticipated building elevation, the side sewer shall be constructed
at a 2% slope from the tee.
J. Side Sewers shall not have horizontal or vertical bends located within the right-of-
way.
K. Side sewers shall have a minimum cover of 5 feet at the edge of right-of-way.
L. Side sewers shall be a minimum of 5 feet from potable water service lines.
M. Side sewer cleanouts shall be installed within 3 feet of the building foundation
providing an access point into said line for future maintenance.
N. Side sewer cleanouts shall be installed at the edge of the property owner’s side of
the public right-of-way line or utility easement where the ownership of the side sewer
changes from private to public.
O. Sanitary sewer cleanouts shall be installed in side sewers every 100 feet and for each
change in direction totaling 90 degrees. See Figure 8-03.
P. If the private portion of the side sewer crosses another private property other than
the property being served, a minimum of a 10 foot wide private sewer easement (5
feet on either side of the pipe centerline) must be obtained granting the property
owner being served permission to cross said property.
Q. All side sewers must use push on gasketed joints. Glued joints are not allowed
outside the building footprint.
Issued January 2022 City of Auburn
Engineering Design Standards Page 93
Figure 8-03 Side Sewer Layout
8.04 Oil/Water Separators
Prior to discharging into the sanitary sewer system, oil separation facilities shall be used in
pre-treating drainage flows from fuel islands, trash enclosures, wash pads, and floor drains
where (in the sole opinion of the City Engineer) heavy concentrations of oil may occur.
Pads with drains for trash enclosures and wash pads intended for washing the exterior
surfaces of vehicles shall drain to a catch basin with a downturned 90-degree elbow prior
to discharge to the sanitary sewer. Oil/water separators for other applications shall meet
the following design criteria:
A. A forebay to collect floatable and the larger settleable solids.
B. A surface accessible inspection T inside the first chamber at the inflow pipe and a
sample T at the last chamber at the outflow pipe.
C. Access to the separator shall be maintained free for inspection at all times.
Issued January 2022 City of Auburn
Engineering Design Standards Page 94
D. A maximum of 200 SF of uncovered area open to rainfall may discharge to the
separator. Refer to BMP S441 in the SWMM for applications where this may apply.
E. If a pump mechanism is required to convey the discharge from the site to the
sanitary sewer system, the pump must be designed for discharge to a controlled
gravity outlet flow into the City system.
F. The separator shall have a valve on the discharge pipe that can be closed during
cleaning and in the event of a spill.
G. All piping entering and leaving the separator must be 6 inches minimum diameter.
H. Access points in the top of the separator vault must be provided to allow a minimum
twelve-inch diameter access for observation and maintenance to all chambers of
the separator.
I. Access doors shall be galvanized spring-assisted diamond plate with a penta-head
bolt-locking latch and recessed lift handle.
J. Access doors must open a full 180 degrees.
8.05 Pressurized Sewer Systems
Private low pressure sewer systems are allowed only where the existing public system has
already been extended to, or is within 200 feet of, the subject property and the elevation
differences between the public sewer main and the subject property do not allow for a
gravity connection. Extension of a private gravity sewer main onto the property(s) may be
required if such extension could make gravity sewer service possible. Sewage from
pressurized systems must be discharged into a minimum 6-inch diameter private gravity
side sewer prior to connecting to the public portion of the side sewer.
Low pressure sewer systems are not allowed in public right-of-way or public easements.
Low pressure sewer systems shall be owned and maintained by those connecting to it.
Systems serving multiple properties shall be within easements or tracts dedicated or owned
by all properties connecting to the system.
All other proposed pressurized systems require deviation(s). In addition to the standard
deviation considerations required by these standards, deviations requesting pressurized
systems must show that extension of the public systems as intended per the Sewer
Comprehensive Plan to serve the property(s) and that serving the property(s) with septic
system(s) are not feasible. Septic systems may only be considered infeasible if there is no
form or scale of a septic system(s) that the County would accept for at least one form of
development of the property(s) that would be allowed under the current zoning and land
use regulations. Determination that septic system(s) are not feasible require written
documentation from the County.
8.06 Sanitary Sewer Meters
The use of sewer meters shall only be allowed if it is determined by the City Engineer that
a sewer meter is the appropriate device for the accurate measurement of wastewater being
sent into the public sewer system.
8.07 Storm Drainage System Requirements
All requests for developing a storm drainage system must comply with the City of Auburn
Surface Water Management Manual (SWMM). The City has adopted the 2019
Issued January 2022 City of Auburn
Engineering Design Standards Page 95
Department of Ecology Stormwater Management Manual for Western Washington and
the City of Auburn Supplemental Manual as the SWMM. The Supplemental Manual
provides guidance for applying specific sections of the Ecology document within the City
of Auburn. All references to the City’s SWMM include both documents. The City’s
Supplemental Manual can be found utilizing the following hyperlink:
Supplemental Manual
Subject to exceptions and criteria as defined in the SWMM, ALL new or re-development
project must use Low Impact Development (LID) principles, if feasible.
Storm drainage system design is guided by the 10 Minimum Requirements for
Stormwater Management, listed below. The applicability of the Minimum Requirements is
based on project size and the total new and/or replaced hard surfaces created by the
project. It is recommended that the Minimum Requirements, especially LID, are
considered at the beginning of project design to insure that the required elements can be
included in the project. The SWMM also addresses modeling standards and design
criteria for conveyance, storage, treatment facilities, and other drainage system
structures.
The SWMM is divided into five volumes that address different aspects of storm drainage
system design. These volumes and the key components for design and application
submittal are:
Volume I – What Requirements Apply to My Site?
The 10 Minimum Requirements (MR) for Stormwater Management are:
o MR #1: Preparation of Stormwater Site Plans
o MR #2: Construction Stormwater Pollution Prevention Plan
o MR #3: Source Control of Pollution
o MR #4: Preservation of Natural Drainage Systems and Outfalls
o MR #5: On-Site Stormwater Management
o MR #6: Runoff Treatment
o MR #7: Flow Control
o MR #8: Wetlands Protection
o MR #9: Operations and Maintenance
o MR #10: Off-Site Analysis and Mitigation (Supplemental Manual)
Volume II – Construction Stormwater Pollution Prevention
Volume III – Choosing, Modeling, and Documenting Your BMPs
Volume IV – Source Control BMP Library
Volume V – Runoff Treatment, Flow Control, and LID BMP Library
Issued January 2022 City of Auburn
Engineering Design Standards Page 96
9 Facilities in the Right of Way
9.0 Preface
The design of public and private facilities located within City right-of-way shall be in conformance with
these standards. For the purposes of these standards, “facilities” shall include City owned and non-
City owned potable water, irrigation water, sanitary sewer, storm drain, gas, communications,
electrical, illumination, and any other utility facility and their appurtenances. This chapter also covers
non-utility facilities such as building foundation elements, awnings, and private signs.
When a non-City sponsored project requires the relocation of private utilities due to public utility
extensions or other City required improvements, the cost of relocation of the private utility shall be
borne by the developer.
9.01 Franchise/Public Way Agreement Requirement
Private facilities within the City right-of-way require prior approval from the City. Except as
allowed otherwise by Auburn City Code, owners of private facilities in the right-of-way shall have a
current franchise, public way agreement, or Right-of-Way Use Permit consistent with Title 20
and/or Title 13 and/or Title 12, if applicable, of the Auburn City Code.
9.02 Construction Permit Requirement
Any non-City entity intending to construct, repair, or replace any facility in City right-of-way shall
apply for a construction permit. Applications for constructions permits can be made directly
through MyBuildingPermit.com. A City permit must be obtained prior to any work within the City
right-of-way.
9.03 Underground Facilities
Unless otherwise provided in a public way agreement, franchise, or lease, all facilities must be
located underground. Exceptions to this standard are as follows:
Fire Hydrants, Blow-offs, Air/Pressure Relief
Pipe and cable crossings of rivers and freeways
High voltage electrical facilities (transmission lines and substations)
Illumination and signal facilities
Telephone pedestals
Aerial cables hung on existing utility poles (with approval of City Engineer)
Small Wireless Facilities
Other facilities, that in the opinion of the City Engineer, cannot be reasonably constructed
underground.
9.03.01 Design Criteria
The City has established the following minimum requirements to ensure the efficient
construction of facilities with the least impact to City transportation and public utility
infrastructure:
Issued January 2022 City of Auburn
Engineering Design Standards Page 97
A. Public water, sewer, storm, and telecommunications facilities shall be constructed per the
Engineering Design and Construction Standards.
B. Private underground facilities shall be installed with no less than 36 inches of finished
cover.
C. Private underground facilities shall be located a minimum horizontal distance of 5 feet
from buildings and public facilities.
D. When crossing public underground facilities, private underground facilities shall be
located a minimum vertical distance of 12 inches from the public utility.
E. Manholes, valve boxes, power vaults, etc., that are located in the paved area of a street
shall be located outside of the wheel paths of vehicles and flush with the pavement
surface.
F. The design of underground facilities shall seek to minimize the number of required
structures and redundant pipes/conduits.
G. Structures located within parking lots, sidewalks, and paths/trails shall also be flush with
the surface. In areas where traffic will pass over the structure, load-bearing lids shall be
incorporated in the design.
H. Trenching, backfill, and restoration shall, within paved areas, be per City of Auburn
Standard Details T-01 and T-02.
I. Repair of existing cement concrete roadway panels shall be per City of Auburn
Standard Detail T-27.
J. Manhole covers, valve covers, vault lids, and other utility appurtenances within pavement
restoration areas, including areas of grind and overlay, shall be first lowered beneath the
final wear course, paved over, and then raised to final grade per City of Auburn
Standard Detail T-05 and per the Construction Standards Section 7-05.3(1). This
requirement may be waived when the total area of the final wear course paving area is
less than 100 SF.
K. The City Engineer may allow required restoration overlays per City of Auburn Standard
Details T-02 and T-02A of individual trenches to be deferred where a program or project
exists that would complete the restoration/overlay of multiple trenches as a single project
or effort. In all cases, permanent repair of the trench is required per City of Auburn
Standard Detail T-01 with the trench construction and backfill and cannot be deferred or
delayed.
9.03.02 Perpendicular Asphalt Trenching and Restoration Requirements
A. Trenching through and within intersections is considered perpendicular trenching.
B. Perpendicular trench backfill shall be in accordance with City of Auburn Standard Detail
T-01.
C. Pavement restoration shall match existing pavement type and thickness with a minimum
thickness of 4-inches.
D. After trenching, the adjacent pavement on each side of the trench shall be sawcut and
removed (full depth) to a minimum of 12 inches from the edges of trench to reveal a clean
pavement edge to patch against. This is referred to as the “T-cut”.
E. In the process of perpendicular trenching, if the remaining section of pavement between
the edge of T-cut and the edge of the pavement/gutter is less than 4 feet wide, the
restoration/overlay will extend to the edge of the pavement/gutter.
Issued January 2022 City of Auburn
Engineering Design Standards Page 98
F. In the process of perpendicular trenching, remaining sections of pavement between the
edge of T-cut and lane line/lane edges less than 4 feet wide, shall be included in the
restoration/overlay area.
G. When more than 1 perpendicular trench is constructed along a roadway, pavement areas
between the limits of the restoration/overlay limits that are less than 10 feet wide are to
be added to the required restoration/overlay area.
H. Perpendicular trenching to roadways may not be allowed on newer roads or streets that
have been constructed or overlaid within the last five years.
I. Perpendicular trenching may not be allowed or may be limited to off-peak hours and/or
weekends on principal arterials or where the construction activity will seriously impede
large volume traffic patterns. Utility connections that have to be made within the roadway
will be allowed after approval from the City.
J. Jacking/boring alternatives may be required as substitute methods for perpendicular
trenching.
K. The minimum pavement patch width and overlay restoration for perpendicular/transverse
trenches shall be per City of Auburn Standard Detail T-02.
L. When multiple trenches are required in close proximity, the asphalt patch shall
encompass all the trenches.
M. The longitudinal edge of the perpendicular asphalt patch shall not lie within the wheel
paths of vehicles.
N. Requirements for curb ramp installation, replacement, and/or upgrade associated with
the utility trench work shall be in accordance with Section 10.06.04.
9.03.03 Longitudinal Trenching in Asphalt Pavement
A. Trenching outside of intersection limits (curb returns) and running parallel, or within 30
degrees of parallel, to the edge of pavement/flowline is considered longitudinal trenching.
B. Longitudinal trench backfill shall be in accordance with City of Auburn Standard Detail
T-01.
C. Pavement restoration shall match existing pavement type and thickness with a minimum
thickness of 4-inches.
D. After trenching, the adjacent pavement on each side of the trench shall be sawcut and
removed (full depth) to a minimum of 12 inches from the edges of trench to reveal a clean
pavement edge to patch against. This is referred to as the “T-cut”.
E. In the process of longitudinal trenching, if the remaining section of pavement between
the edge of T-cut and the edge of the pavement/gutter is less than 4 feet wide, the
restoration/overlay will extend from the trench to the edge of the pavement/gutter.
F. In the process of longitudinal trenching, remaining sections of pavement between the
edge of T-cut and adjacent lane line/lane limits less than 4 feet wide, shall be included in
the restoration/overlay area.
G. When more than 1 longitudinal trench is constructed along a roadway, pavement areas
between the limits of the restoration/overlay limits that are less than 5 feet wide are to be
added to the required restoration/overlay area.
H. The longitudinal edges of the asphalt patch shall not lie within the wheel paths of vehicles.
Issued January 2022 City of Auburn
Engineering Design Standards Page 99
I. The minimum pavement patch width and overlay restoration for longitudinal trenches
shall be per City of Auburn Standard Detail T-02.
J. For streets that have been constructed or overlaid within the last 5 five years, or for
principal arterials where open trenching will impede large volume traffic patterns, the City
may require that trenchless techniques be used as an alternative. The City may require
that trenchless techniques be limited to off peak hours and/or weekends.
K. Requirements for curb ramp installation, replacement, and/or upgrade associated with
the utility trench work shall be in accordance with Section 10.06.04.
L. The City Engineer may allow trench restoration/overlay of individual trenches to be
included in a program or project to complete the restoration/overlay of multiple trenches
as a single project or effort.
9.03.04 Trenching in Cement Concrete Pavement
Trenching in concrete pavements shall conform, where applicable, to the previous sections and
the following:
A. The edges of trenches in concrete pavement shall be sawcut prior to excavation to avoid
damaging the slab. Concrete slabs 6 inches and over shall be drilled for the installation
of dowels. Dowels shall be 1 and 1¼ inches in diameter, 18 inches long, and spaced 12
inches center to center.
B. The minimum pavement patch width for concrete trenches shall be 4 feet.
C. In the process of trenching concrete, if the section of pavement between the trench and
the edge of the existing concrete panel is less than 4 feet, the section shall be removed
and replaced.
D. Longitudinal trenches in concrete may be repaved with an asphalt pavement thickness
of equivalent strength upon City approval.
9.03.05 Trenching in Other Right-of-Way Surfaces
Trenching in areas other than right-of-way surfaces, including sidewalks, gravel shoulders, and
landscape strips, shall conform, where applicable, to the previous sections and replace the
disturbed material in kind or as directed by the City. Utility trench bedding and backfill shall
conform to City of Auburn Standard Detail T-01 and to the Construction Standards.
9.04 Aboveground Facilities
Where underground requirements do not apply, the following parameters will need to be
addressed in locating or relocating aboveground utilities:
A. Clear Zone Requirements: Non-breakaway utility poles and other fixed aboveground
utility structures shall meet the clear zone requirements of these design standards (See
Section 10.18). Respective utility owners shall be responsible for securing easements
from adjacent property where clear zone requirements cannot be met within the public
right of way.
B. ADA Requirements: Utility poles and other aboveground utility structures shall not be
located within the sidewalk. This requirement may be waived by the City Engineer if pole
location in the sidewalk allows a minimum of 48 inches of unobstructed pedestrian travel
way and the pole/structure meets clear zone/lateral separation requirements described
in Chapter 10.18.
Issued January 2022 City of Auburn
Engineering Design Standards Page 100
C. Utility poles and other aboveground utility structures shall be compatible with driveways,
intersections, and all other road features. They shall not interfere with sight distance,
road signing, traffic signals, culverts, etc. This may require that existing poles be
relocated at the developer’s expense.
D. No utility pole or other aboveground utility structures shall be located in such a way as to
pose a hazard to the general public. Utility companies shall locate and replace poles and
other structures with primary consideration given to public safety and roadway
functionality.
E. New overhead power and communications wires and appurtenances shall comply with
the vertical clearance requirements established by WAC-468-34-290. Except as may be
determined otherwise by the City Engineer to address safety issues, for the purposes of
this overhead clearance requirement, replacement of existing facilities and overlashing
of existing cables/wires that do not reduce the existing minimum vertical clearances are
not considered to be new. Whether considered to be new or not, plans for overhead
power and communications wires and appurtenances must show the existing and
proposed vertical clearance of the facilities being installed or modified at each midspan
location between poles.
F.If allowed by the City Engineer, wireless and radio facilities that are not considered
Small Wireless Facilities per Auburn City Code 20.14 are subject to the concealment
standards cited in Section .06.05.
9.05 Building and Structure Related Facilities
Permanent buildings, building shoring systems that would leave any elements in the right-of-way
after construction, footings and foundations, and privately owned walls, gates, and fences are not
allowed in the public right-of-way.
Facilities such as Awnings, overhangs, and elevated decks/patios/railing (only in the Downtown
Urban Center Zone), and bus shelters may be permitted by the City Engineer with special
conditions and considered on a case-by-case basis and subject to Auburn City Code 12.60.
9.06 Small Wireless Facilities
This section describes design standards for Small Wireless Facilities as set forth in Auburn City
Code 20.14. The purpose of these standards is to provide concealment and safety standards for
Small Wireless Facilities in the public right-of-way. Small Wireless Facilities will comply with the
following subs
9.06.01 General Requirements
1. Small wireless facilities will comply with applicable Federal Communications Commission
(FCC), Federal Aviation Administration (FAA), state, and City regulations and standards.
2. A Small Wireless Facility will not be used for mounting signs, billboards or message displays
except as approved by the City for the purpose of providing concealment.
3. No lights, other than street lights, are permitted on any pole or antenna unless required by the
Federal Communications Commission, the Federal Aviation Administration, or the City.
4. No Small Wireless Facility may be attached to a tree or any other vegetation.
5. Installation of a new pole in the public right of way to serve a Small Wireless Facility will not
be allowed whenever an existing pole or other structure in the public right of way can meet
technical and network location requirements and the owner of said pole or structure grants
Issued January 2022 City of Auburn
Engineering Design Standards Page 101
permission for the Small Wireless Facility Attachment. If the existing pole or structure does
not meet the City’s design standards or other requirements, with agreement from its owner, it
may be replaced with a pole or structure that meets the design requirements and these
standards. In these cases, all attachments must be transferred from the existing pole to the
new pole and the existing pole must be completely removed and surface restored.
6. Small Wireless Facilities and all associated facilities, including support poles or structures, will
be free from all manufacturer decals and/or logos.
7. Generators are not permitted for Small Wireless Facilities. A battery backup may be permitted
through the submittal of a concealment plan and emergency spill response plan.
8. Installation of Small Wireless Facilities is not allowed where it would create a sight distance
issue for vehicular or non-motorized traffic, identified in the City of Auburn Engineering Design
and Construction Standards.
9. Applications for Small Wireless Facilities will include plans that conform to the plan
requirements described in the City of Auburn Design and Construction Standards.
Concealment plans will include photos of the proposed site location(s) with overlaid renderings
of the proposed Small Wireless Facilities to demonstrate the facility’s adherence to
concealment standards.
10. Small Wireless Facilities may not share power service connections with City facilities unless
specified otherwise in the applicable use agreement for City-owned property.
11. Record Construction Drawings are required in accordance with the City of Auburn Engineering
Design and Construction standards.
9.06.02 Attachments to City Facilities
1. Attachment, modification, relocation, or replacement of City facilities requires an executed
agreement with the City in addition to any applicable franchise or public right-of-way
agreements.
2. Attachment to an existing City pole requires calculations sealed by a Professional Engineer
that shows the existing pole can support the Small Wireless Facility. Where the existing facility
being attached to is a City owned street light, signal pole, sign support structure, or Dynamic
Message Sign (DMS) support structure, calculations must show compliance with the strength
and loading parameters stated in the City’s Construction Standards. The loading calculations
will include consideration of potential future loading with planned or potential future City facility
attachments.
3. Small Wireless Facilities are not permitted on City street light poles where they would interfere
with street lighting, City banners, flower baskets, holiday lighting, holiday decorations, or other
City uses of the pole.
4. Replaced City light poles will be of the same color and similar style as adjacent existing City
light poles, unless otherwise approved by the City Engineer. Where a City light pole has been
replaced or relocated the davit arm length will be replaced as needed to place the luminaire
in-line with the other luminaires along the roadway and in accordance with City design
standards.
5. Installation of Small Wireless Facilities on City facilities within secured sites is not allowed.
Secure City facilities are those facilities that are enclosed by a fence with locked gate access
and typically include water reservoirs, water treatment plants, pump stations, and water wells.
6. Installation of Small Wireless Facilities on traffic signal mast arms is not allowed.
9.06.03 General Pole Requirements
1. Installation of Small Wireless Facilities on poles intended to break-away from vehicular impact
is not allowed.
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2. New, replaced, or relocated poles are not allowed within the clear zone (as identified in the
City of Auburn Engineering Design and Construction Standards). For the purposes of
determining clear zone requirements, poles with Small Wireless Facilities attached are
considered utility poles.
3. Small Wireless Facilities will be mounted such that no portion of the facility, including antenna,
are higher than 50 feet, or 10% higher than the height of buildings or structures immediately
adjacent to the right-of-way, or the Small Wireless Facility attachment does not extend the
height of the pole to more than 50 feet or by more than 10 percent, whichever is greater.
4. A pole that is relocated or replaced for the purpose of attaching a Small Wireless Facility is
considered an existing structure.
9.06.04 Wiring and Conduit
1. All wiring must be inspected and accepted by Washington Department of Labor and Industries
and associated documentation provided to the City prior to being placed into service.
2. Except on wooden poles and other support structures where internal routing is not feasible,
all cables, wires, and fiber must be routed internally in the pole or support structure and must
not be visible externally.
3. Wiring, cables, and fiber associated with the Small Wireless Facility will be in their own conduit,
interducts, and channels so they are not co-mingled with conduits and cables serving other
uses. Electrical wiring will be separated from communications wiring with interduct or separate
channels.
4. All interducts, channels, cables, and wiring will be clearly labeled at the pole ends, handholes,
junction boxes, and other termination points. Record construction drawings will show and label
all cables/wiring, interduct, and channels.
9.06.05 Concealment
1. Small Wireless Facilities will be screened, concealed, or camouflaged employing the best
available technology, such as compatible materials, shrouding, location, color, and other
tactics to minimize visibility of the facility.
2. Pole mounted equipment, antenna, conduits, cables, mounting hardware, and other visible
components will match the color of the pole they are attached to unless specifically approved
by the City.
3. The City Engineer or the City Engineer’s designee will consider the cumulative visual effects
on the visual character of the surrounding area of Small Wireless Facilities mounted on
existing structures and/or located on a given permitted site in evaluating concealment
requirements.
4. Where conduit or cables are mounted external to the support structure, the outside cable
conduit or cable will be the color of the support structure, and the City may require that the
cable be placed in conduit.
5. Full concealment of all conduit, cables, wires, and fiber is required within mounting brackets,
shrouds, canisters, or sleeves if attaching to exterior antennas or equipment.
9.06.06 Pole Mounted Antennas and Equipment
1. Antennas will be located, mounted and designed so that visual and aesthetic impacts upon
surrounding land uses and structures are minimized, and so that they blend into the existing
environment.
2. Panel antennas shall not be mounted more than 12 inches from the surface of the utility pole,
with the distance measured from inside edge of the antenna to the surface of the pole, unless
an additional distance is required by the pole owner. An applicant may install a side-mounted
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canister antenna, so long as the inside edge of the antenna is no more than 12 inches from
the surface of the pole.
3. Pole mounted equipment other than the antenna(s), electric meter, and disconnect switch
must be concealed within equipment enclosures. Equipment enclosures will be installed flush
to the pole and not extend more than 24 inches from the face of the pole.
4. All attachments to a pole that are projecting, or any equipment or appurtenance mounted on
the ground, will comply with the Engineering Design and Construction Standards, the
Americans with Disabilities Act (ADA) standards and will not obstruct an existing or planned
sidewalk or walkway.
5. All proposed projecting attachments to the pole will provide a minimum vertical clearance of
12 feet over sidewalks, 16 feet over driveways, and 20 feet over roadways.
9.06.07 Non-Pole Mounted Equipment
1. Non-pole mounted equipment facilities will be placed underground if doing so is technically
feasible and would not defeat the purpose of the facility.
2. Above ground equipment facilities that are not pole mounted will be screened from any street
and adjacent property with fencing, landscaping, shrouding, topography, or a combination of
these methods,
3. Above ground equipment facilities that are not pole mounted will be treated with graffiti
resistant paint or material.
9.06.08 Strand Mounted Small Wireless Facilities
1. Each strand mounted Small Wireless Facility will not exceed three cubic feet in volume.
2. The strand mounted Small Wireless Facility will be placed as close as possible to the nearest
utility pole, but no more than five feet from the pole unless a greater distance is technically
necessary or required by the pole owner for safety clearance.
3. No strand mounted Small Wireless Facility will be located in or above the portion of the
roadway open to vehicular or non-motorized traffic.
4. Strand mounted small wireless facilities must be installed to cause the least visual impact and
with the minimum excess exterior cabling or wires (other than the original strand) necessary
to meet the technological needs of the facility.
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10 Streets
Preface
The intent of this chapter is to encourage the uniform development of an integrated and accessible public
street system that will support present and future multimodal transportation. Through the implementation
of these standards, streets are built as transportation facilities as well as public space, contributing
positively to the character of an area. These standards help create an efficient multimodal transportation
system with minimal environmental impact to the community.
The design of Streets within the City of Auburn shall conform to the standards provided herein. The
latest editions of the American Association of State Highway and Transportation Officials (AASHTO),
FHWA and Washington State Department of Transportation, Manual on Uniform Traffic Control Devices
(MUTCD), and the State of Washington Department of Transportation (WSDOT) standards shall be
utilized by the City Engineer when the design standards, standard specifications, or standard drawings
are not covered by the scope of the City’s standards.
The design criteria used to estimate future street usage are established in the City’s Transportation Plan.
All streets shall be designed and constructed to comply with Federal Americans with Disabilities Act
(ADA) laws. Additional guidelines and information can be found at WSDOT’s ADA web page by clicking
on the following hyperlink:
https://wsdot.wa.gov/about/americans-disabilities-act-ada
10.00 Required Public Street Improvements
The requirements described in this section are in addition to any requirements determined during the
SEPA process and/or the traffic study process described in this chapter, to be required to mitigate
localized impacts of the proposed development activity. This section describes the requirements for
public improvements triggered by permitted actions as set forth in Auburn City Code 12.64A.
10.00.01 Half-Street Improvements
A public street frontage that requires public improvements is referred to as a “Half-Street”. The Half-
Street extents are determined using the fronted street’s cross section applicable to the street’s
roadway classification as defined in the City’s current Comprehensive Transportation Plan. The
Half-Street may apply to an existing roadway or to a planned roadway which has not yet been built.
The Half-Street width is the area from the planned right-of-way limits to the planned roadway
centerline and extends along the entire length of the subject property frontage(s) with vehicular or
non-motorized access. Half-Streets require dedication of public right-of-way and construction of the
following elements: paved roadway, sidewalks, curb/gutter, street landscaping, street lighting
system, storm drainage, and conduit for City telecommunications. The City Engineer may require
improvements, upgrades or reconstruction of existing improvements within the Half Street that do
not conform to current City standards.
For the purposes of evaluating public improvement triggers and where Half-Street improvements
are required, gated access that only serves emergency vehicles is not considered vehicular or non-
motorized access.
When Half-Street construction is required on unpaved streets or unimproved areas, a minimum of
24 feet of pavement will be required. In these cases, the street will be designed to provide drainage
for the constructed portion of the street and to allow for extension of the storm drainage system to
the undeveloped portion of the street with future construction. The unfinished side of the Half-Street
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shall be finished with temporary curbing, shoulders, clear zones, guardrail, slope treatments, and
drainage accommodations to assure proper drainage, bank stability, and traffic safety.
If a Half-Street does not connect at both ends to other streets, construction of a permanent or
temporary cul-de-sac will be required.
Where Half-Streets are connected to existing streets, lane transition tapers are required in
accordance with AASHTO where edges of pavement do not match. Pavement transition tapers
shall be constructed to a minimum of 5:1 or as constrained by the existing right-of-way.
All required utilities located within the portion of the street being built, shall be installed during
construction. Half-Street construction may also require the upgrading of existing utilities if said
upgrading was necessary for the proposed development.
When Half-Streets connect to an intersection, the nearest corner of the intersection on the side
being improved shall be designed and constructed for the full build-out of the street. The intersection
design and construction shall include adequate improvements to insure safe use by pedestrians,
bicycles, and vehicles. For half-street improvements required in alleys, the following applies for all
development types: Pave the alley to a width of 20 feet along the frontage of the property. If
adequate right-of-way does not exist to provide the required 20 feet of pavement adjacent to the
property, the appropriate dedication of right-of-way shall be required. Such dedication shall be
equally apportioned from both sides of the alley, when feasible, as determined by the City Engineer,
and the resultant right-of-way width paved. In addition, for half-street improvements required in
alleys for any non-single family development the following applies: Pave the alley between the
development and the connection of the alley to the public street(s) serving the development at a
minimum width of 20 feet or to the width of the existing right-of-way, whichever is less.
10.00.02 Additional Improvements
Additional public improvements besides the Half-Street improvements may be required as
determined by the City Engineer to be necessary to mitigate the impacts of the development activity
that may include the following improvements, not necessarily located on the property frontage:
additional street lighting
additional storm drainage systems
traffic control and other safety systems including, but not limited to, roadway channelization,
signage, non-motorized safety, and traffic calming
dedication of public right-of-way on public street frontages without vehicular or non-motorized
access
10.01 Street Classification and Street Layout
An efficient transportation system seeks to spread vehicle movements over a series of planned streets.
The goal of the system is to encourage connectivity while preventing unacceptably high traffic volumes
on any one street. Ample alternatives should exist to accommodate access for emergency vehicles.
For these reasons the City will continue to plan a series of arterials and collectors designed to national
standards to provide efficient service to the community. Ample alternatives should also exist to
accommodate non-motorized transportation on arterials, collectors and local roads within and between
subdivisions.
All streets in the City of Auburn have been classified using the Federal Functional Classification system.
A map showing the City’s street classifications is shown in the Comprehensive Transportation Plan.
New streets and/or new street systems, other than local residential streets serving residential
neighborhoods, shall be configured in conformance with the City’s comprehensive plan guidelines and
policies. Where the comprehensive plan lacks clear guidance to address a particular situation, the City
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may require traffic studies and other supporting analysis to help define the configuration and nature of
the planned street system.
The following section contains descriptions of the street classifications used in the City. Table 10-1
(included at the end of Chapter 10) contains information relating to each streets design requirements
for widths, radii, typical speed limits, and other information. This section also contains typical cross-
sections for each street classification. These cross-sections contain information on street layouts and
widths of various street elements. Roadway pavement sections shall conform to Section 10.01 of these
design standards. Streets and street networks will be configured to deter speeding. Traffic calming
measures may also be required to deter speeding.
Projected trip generation shall be calculated based on the current edition of the Institute of Transportation
Engineers (ITE) Trip Generation Manual.
Streets shall not be linked to a new street if the connection is likely to result in traffic volumes that will
exceed acceptable volumes for the road’s classification. These volumes are defined in Table 10-1
(included at the end of Chapter 10) of these standards. Consideration may also be given to the
character and nature of the neighborhoods proposed to be connected.
10.01.01 Arterials
Arterials are the highest level of City Street classification. They fall under the following two
categories: Principal Arterial and Minor Arterial.
Principal Arterial
See Figure 10-01 below.
Principal Arterials are designed to move traffic between locations within the region and to access
the freeways. Design emphasis is placed on providing movement of inter-city through-traffic
rather than intra-city traffic. Direct access to commercial and industrial land uses is permitted,
but managed to improve safety and reduce congestion.
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Figure 10-01 Principal Arterial Typical Cross Section (82’ ROW)
Figure 10-01 Principal Arterial Typical Cross Section w/Trail (87’ ROW)
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Minor Arterial
See Figure 10-02 below.
Minor Arterials interconnect with and augment principal arterials and provide service to trips of
moderate length at a somewhat lower level of travel mobility than principal arterials. The minor
arterial street system includes all arterials not classified as a principal or collector and consists
of facilities that place more emphasis on land access than the higher system and offers a lower
level of traffic mobility. Minor Arterials may serve secondary traffic generators such as community
business centers, athletic fields, neighborhood shopping centers, major parks, multifamily
residential areas, medical centers, large church complexes, hospitals, and traffic from
neighborhood to neighborhood within the City.
Figure 10-02 Minor Arterial Typical Cross Section
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10.01.02 Collectors
Collectors are a step below Arterials in the City classification system. They fall under the following
three categories: Residential Collector, Non-Residential Collector, and Rustic Collector.
Residential Collector
See Figure 10-03 below.
Residential Collectors are used to connect intra-community streets, residential neighborhoods,
commercial areas, industrial areas, and community centers to minor and principal arterials.
Residential Collectors are typically constructed to accommodate 2 travel lanes and a two-way
left-turn lane or 2 travel lanes and bike lanes.
Figure 10-03 Residential Collector Cross Section
Non-Residential Collector
See Figure 10-04 below.
Non-Residential Collectors provide intra-community access connecting non-residential
properties with activity centers and recreational facilities. They may serve neighborhood traffic
generators such as one store or a small group of stores, elementary schools, churches,
clubhouses, small hospitals or clinics, areas of small multifamily developments, as well as other
commercial/industrial parcels. Non-Residential Collectors are typically constructed to
accommodate 2 lanes and a center two-way left-turn lane.
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Figure 10-04 Non-Residential Collector Cross Section
Rustic Collector
See Figure 10-05 below.
Rustic Collectors are routes that (regardless of traffic volume) the majority of travel distances are
shorter than on arterial routes and residential neighborhoods to activity centers.
Rustic Collectors provide access to all levels of arterials, are typically constructed to
accommodate 2 lanes with gravel shoulders on both sides.
Figure 10-05 Rustic Collector Cross Section
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10.01.03 Local Streets
Local Streets are the most common streets in the City. They can be categorized as either Local
Residential, Local Non-Residential, or Rustic Residential.
The internal local residential street network for a neighborhood shall be designed to discourage
regional through traffic and non-residential traffic from penetrating the neighborhood or adjacent
neighborhoods. Local residential streets shall not exceed 1,300 feet in length between
intersections.
Residential neighborhoods shall be planned in a manner that limits the number of local street
accesses to arterials and collectors to be the minimum number of accesses required to limit the
design ADT on existing and planned local residential streets in the neighborhood to the design
ADT listed in Table 10-1 (included at the end of Chapter 10). Additionally, neighborhoods with
over 30 dwelling units are required to have a second access to provide for emergency vehicles
given that if the neighborhood has 100 or less dwelling units, the second access to provide for
emergency vehicles must be gated and restricted to emergency vehicles only. Non-motorized
access may also be provided at the emergency vehicle access. Residential development shall
provide for additional non-motorized access to adjacent neighborhoods, roadways, parks, and
schools to maintain connectivity.
Local Residential
See Figures 10-06, 10-06A, and 10-06B below.
Local Residential streets provide access to abutting residential parcels. They offer the lowest
level of mobility among all street classifications. The street is designed to conduct traffic between
dwelling units and higher order streets. As the lowest order street in the hierarchy, the access
street usually carries no through traffic and includes short streets, cul-de-sacs, and courts.
Service to through traffic movement is discouraged and the street usually contains no transit bus
routes.
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Figure 10-06 Local Residential Cross Section
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Figure 10-06A Local Residential Cross Section – Alternate
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Figure 10-06B Local Residential Cross Section – Alternate w/Bioretention Swale
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Local Non-Residential
See Figure 10-07 below.
Local Non-Residential streets provide direct access to higher order classification streets and
serve primarily industrial/manufacturing land uses. They offer lower level of mobility and
accommodate heavy vehicle traffic. Service to through movement is discouraged.
Figure 10-07 Local Non-Residential Cross Section
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Rustic Residential
See Figure 10-08 below.
The Rustic Residential streets primarily provide access to the adjacent land and distribute traffic
to and from the principal or minor arterials and local access streets. The travel distance is
relatively shorter as compared to Rustic Collectors.
Figure 10-08 Rustic Residential Cross Section
10.01.04 Alleys
Alleys provide vehicular access to abutting properties and are not intended for general traffic
circulation. Dead-end alleys are generally unacceptable; however, where dead-end alleys are
determined suitable by the City Engineer, for short term or temporary applications, they shall be
provided with adequate turnaround facilities at the dead-end. All new alleys shall be private.
Alleys shall incorporate the design criteria used in designing local streets with the following
exceptions:
A. Design speed is 15 mph.
B. All new alleys shall have a minimum width of 20 feet of asphalt pavement.
C. The pavement section for alleys located in non-single family zones shall be consistent
with a local non-residential street standard.
D. Curb and gutter, sidewalk, lighting, and landscaping are not required along alleys.
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E. Alleys may be paved with either a crown at centerline with asphalt wedge curbs on both
sides to control drainage or be sloped to one side with an asphalt wedge curb on one
side to control drainage. When necessary, storm drainage conveyance systems shall be
installed along the alley to address storm drainage runoff from the paved surface.
F. Alleys shall connect to City streets via a commercial driveway apron.
Alleys serving alley loaded lots shall include provisions for unimpeded vehicular
circulation along the alley, and provisions for adequate sight distances along both the
alley at driveways and at intersections with public streets.
10.01.05 Private Street
The City Engineer will determine on a case-by-case basis whether or not a private street will be
allowed. Besides the Private Access Roads described in these standards, private streets are
generally discouraged and will only be considered for approval by the City Engineer under the
following circumstances:
The street does not provide a current or future planned connection between public
roadways.
The street does not provide current or future access to properties other than those whom
would own the private street.
The street would not result in land locking present or planned parcels.
The street would only serve a single planned apartment, townhome, condominium,
industrial, or commercial development project.
The street would directly connect to a public street.
Private streets will be in conformance with the street standards that most closely reflects their
intended use, with a minimum of 36 feet of pavement width or 28 feet of pavement width with a
marked fire lane on one side.
Private streets shall be located within permanently established tracts or easements. A capable,
legally responsible owner or homeowners’ association shall be established to maintain private
streets. A plat or short plat with private streets requires an executed recorded Private Street
Maintenance Agreement and a Storm Water Easement and Maintenance Agreement that
obligate the future property owners to maintain the infrastructure indefinitely.
10.01.06 Cul-de-sacs
Where possible, streets shall be planned, designed and constructed to connect to future
developments. All permanent dead-end streets shall end in a cul-de-sac. Permanent dead-end
streets will only be allowed where a through street to connect adjacent properties and/or other
streets is not needed or not possible. Streets that are expected to be extended in the future are
considered temporary dead-end streets. Temporary dead-end streets that exceed 150 feet in
length shall have a temporary cul-de-sac. Dead-end streets shall not be more than 800 feet in
length as measured from the center of the nearest intersection to the center of the cul-de-sac.
Dead end streets ending in permanent cul-de-sacs shall serve a maximum of 30 dwelling units.
When applicable, non-motorized paths shall be provided at the end of the street to shorten
walking distances to an adjacent arterial or public facilities including, but not limited to, schools
or parks. Existing stub-end streets that are greater than 800 feet in length shall be linked to other
streets whenever the opportunity arises, unless it can be demonstrated that such connections
would lead to a substantial rerouting of through traffic onto the street.
Maximum allowable vertical grade/cross-slope on cul-de-sacs is 5%.
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Temporary Cul-de-sacs
Temporary cul-de-sacs may be provided only when there is a plan for extending the street.
Temporary cul-de-sacs shall have a paved surface with a diameter of 65 feet.
A sign shall be posted at the back of the temporary cul-de-sac stating that the road is planned
to be extended in the future and to contact the City of Auburn Public Works Department for
further information.
Permanent Cul-de-sacs
Permanent cul-de-sacs shall have a paved surface with a diameter of 75 feet to the face of
curb and a 7 foot sidewalk unless otherwise directed by the City.
Permanent cul-de-sacs right-of-way shall have diameter of 90 feet unless otherwise directed
by the City.
Street Lights and Fire Hydrants shall be placed in an easement behind the sidewalk.
10.02 Street Geometry
Specific geometric design requirements are listed in Table 10-1 (included at the end of Chapter 10).
For in-depth design information on the geometric design criteria, reference the AASHTO Manual “A
Policy on Geometric Design of Highways & Streets,” latest adopted edition.
In addition to the standard deviation criteria listed in Section 1-04, deviations from geometric design
standards shall consider the classification of the roadway, traffic circulations, traffic congestion,
emergency access, adjacent property access, length of geometric deviation, and impact to public
utilities.
10.02.01 Horizontal Curves
Horizontal curves shall be designed to provide the minimum radii required for vehicles to safely
negotiate a turn without leaving their driving lane and shall in no case violate minimum sight distance
requirements. Minimum radii are established by the design speed of the street on which the curve
is located.
10.02.02 Reverse Curves
Sections of straight roadway must be designed between curves to avoid quick left-right transitions
that could potentially lead to loss of vehicular control. Where reversing curves are superelevated,
tangents between curves shall be of sufficient length to accommodate transitions into and out of the
superelevated sections.
10.02.03 Superelevations
The process of superelevating a street provides a constant cross slope from one edge of the
roadway to the other. This allows vehicles to travel around a turn at a higher speed than would be
possible if the road were a normal crown cross section.
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10.02.04 Vertical Grades
Deviations to the maximum allowed vertical street grades of arterial and collector roadways shall
generally not be granted unless it can be demonstrated that, and the City Engineer determines that,
the public benefits significantly outweigh any potential detriments.
Vertical grades may be increased to 10% without deviation for local residential streets where all
other geometric design criteria are met.
Deviations will only be considered for up to a 8% maximum grade for arterials and a 10% maximum
grade for non-arterials. If approved, deviations for roadway grades above 8% may trigger the
additional following design considerations, as determined to be necessary by the City Engineer:
Increased travel lane widths
Enhanced Paving Section
Incorporation of Separated Multi-use trail
Incorporation of Median Islands
Enhanced Intersection/Signal Improvements
10.02.05 Vertical Curves
Vertical curves are required where a change in vertical alignment equals or exceeds a 1% algebraic
grade difference. Crest vertical curves shall be designed to provide the required minimum stopping
sight distance for the streets design speed. Sag vertical curve lengths shall be designed to provide
headlight sight distance equal to or greater than the design speed stopping sight distance. All vertical
curves must be symmetrical, parabolic, and meet AASHTO standards.
10.02.06 Cross Slopes
City streets shall be crowned in the middle to provide drainage to the gutter line or roadside ditches.
The cross slopes created by this crown shall be 2% for local streets and 3% for collectors, arterials,
and roads with vertical grades of greater than 6%. The cross slopes of roadways constructed with
pervious/permeable pavement may be reduced to 1%. Collectors and arterials shall have steeper
cross slopes since the higher speeds associated with these roads require that water drain more
quickly from the roadway to avoid hydroplaning.
10.02.07 Posted and Design Speed
For design of new facilities, including design of new facilities connecting to existing facilities, the
“Design Speed” shall be 10 mph greater than the Posted Speed for arterials and 5 mph greater than
Posted Speed for non-arterials. The “Posted Speed” of any new street segment shall be as
designated in Table 10-1 (included at the end of Chapter 10).
10.02.08 Right of Way
The required right-of-way will depend upon the width of the street and other improvements.
Excluding cul-de-sacs, the typical requirement is for the right-of-way to extend a minimum of 10 feet
behind the curb line on each side of the street. Additional right-of-way may be required for
bike/pedestrian trails, retaining walls, or storm facilities, for example. Right-of-way requirements
may be variable within a street corridor due to intersections, turn lanes, bus loading zones, and
other street features.
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Right-of-way shall be conveyed to the City on a recorded plat or by a right-of-way dedication or
separate instrument.
The minimum right-of-way requirements for the various street classifications are shown in the
roadway cross sections in Section 10.01.
The minimum right-of-way requirements for the various curb radii shall be as designated in Table
10-1 (included at the end of Chapter 10). At intersections with two different street classifications,
the highest classification for curb radii shall be used except at intersections with residential streets
where the lowest order street shall be used.
10.02.09 Sight Distance
Minimum sight distance requirements are to be determined using the current edition of AASHTO’s
“A Policy on Geometric Design of Highway Streets”. Easements may be required to achieve sight
distance requirements.
The minimum sight distance for pedestrian safety shall be as shown in Figure 10-10 below and
determined as follows: The driver of an exiting vehicle shall be able to view a one-foot-high object
15 feet away from the edges of the exiting lane or lanes, measured at the back of the sidewalk, when
the driver’s eye is 14 feet behind the back of the sidewalk.
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Figure 10-10 - Pedestrian Sight Distance
10.03 Roadway Width (Travel Way)
The roadway width or travel way consists of inside through lanes and/or curb lanes, center turn
lanes and/or bike lanes (where required), and curb and gutter. Special cases may also require
acceleration and deceleration lanes and right and left turn pockets. Total roadway width is
measured from the face of curb to the face of curb.
10.03.01 Inside Through Lanes and Curb Lanes
The street classification and the amount of existing and projected traffic will determine the
number of lanes required for a street.
Curb lanes or outside lanes on all streets excluding residential collectors and local and rustic
residential streets shall be a minimum of 14 feet wide. Streets will be widened to include inside
through lanes based on street classifications and/or projected traffic volumes. The minimum
width for inside through lanes shall be 11 feet.
10.03.02 Center Turn Lanes
Center turn lanes will be required on principal and minor arterials. They may also be required
on collectors depending upon the nature of the roadway and the number of left turn movement
opportunities along the corridor. Center turn lanes shall be a minimum of 11 feet wide.
10.03.03 Other Lanes
Acceleration and deceleration lanes may be required for sites located on arterials where heavy
volumes and/or heavy truck movements into and out of the site would impact the speed and
safety of the arterial.
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Left turn and right turn pockets may be required at intersections with large numbers of left and/or
right turns. Left turn pockets shall be a minimum of 11 feet wide with right turn pockets a
minimum of 14 feet wide.
10.03.04 Road Edge
All urban roads within the City of Auburn shall be designed using concrete curb and gutter per
WSDOT Standard Plan F-10.12, Traffic Curb & Gutter at the roadway flowlines/flowpaths.
Curbs that are not along flowlines/flowpaths may be constructed as cement concrete traffic curb
per WSDOT Standard Plan F-10.12, Traffic Curb & Gutter. Rustic roads within the City may
be designed with a gravel shoulder (minimum of 3 inches Crushed Surfacing Top Coarse (CSTC)
over 8 inches of Gravel Base; eight 8 feet wide for rustic collectors and 3 feet wide for rustic
residential and a ditch for drainage. Rustic roads shall also meet AASHTO standards for a clear
zone between the edge of pavement and any obstructions. Drainage inlets and grates along
curbs shall be constructed per WSDOT Standard Plan F-10.16.
The maximum slope of the area between the back of the sidewalk and any cut/fill slope shall be
3%.
10.03.05 On-Street Parking
On-Street parking requirements shall be as designated in Table 10-1 (included at the end of
Chapter 10). For Local Residential streets where parking is allowed on one side only and there
are landscape strips present on both sides of the road, the parking shall be placed on the side
of the street that can accommodate the most parking. For Local Residential streets where
parking is allowed on one side only and there is a landscape strip and/or bioretention swale on
only one side of the roadway in accordance with Figures 10-6A and/or 10-6B, the parking shall
be placed on the opposite side of the street from the landscape strip or bioretention swale.
Parking is not allowed at any of the following locations:
1. Within 20 feet of an uncontrolled intersection measured from the point of tangency on the
entering curb radius.
2. Within 30 feet of a stop, yield or signal controlled intersection measured from the point of
tangency on the entering curb radius.
3. Within any intersection. For “T” intersections, the no parking limits shall apply to both sides
of the through street (top of the “T”). See Figure 10-09 below.
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Figure 10-09 - T-Intersection Parking Restrictions
4. In front of or within 15 feet of each side of a fire hydrant.
5. In front of or within 5 feet of each side of a driveway.
6. Where mid-block crosswalks are installed, no parking shall be allowed on either side of the
street within 50 feet in advance of the nearest edge of the crosswalk and within 20 feet
past the furthest edge of the crosswalk. In no case shall the advance parking restriction
for crosswalks be less than the minimum stopping sight distance of the roadway.
Additional parking restriction may be required depending upon roadway geometrics, adjacent
land use, and the proximity to bridges and railroads.
10.04 Roadway Intersections
The following sections contain design criteria for street intersections. These criteria are minimum
values and may need to be modified according to safety factors, traffic volumes (existing and/or
projected), topography, design speed, design vehicle requirements, drainage, and other conditions,
both existing and projected.
10.04.01 Intersection Spacing
Roadway intersections shall meet the minimum centerline spacing requirements as shown in
Table 10-3 below.
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Table 10-3 Minimum Intersection Spacing from Centerline to Centerline
Minimum Intersection Spacing from Centerline to Centerline (ft.)
PRINCIPAL
ARTERIAL
MINOR
ARTERIAL
RESIDENTIAL
& NON-
RESIDENTIAL
COLLECTORS
RUSTIC
COLLECTOR
LOCAL
STREETS
5001 5001 250 250 125 LOCAL STREETS
1320 1320 500 500 250 RUSTIC COLLECTOR
2640 1320 500 500 250
RESIDENTIAL& NON-
RESIDENTIAL
COLLECTORS
2640 2640 1320 1320 5001 MINOR ARTERIAL
2640 2640 2640 1320 5001 PRINCIPAL ARTERIAL
Notes:
1. Local streets shall generally not be allowed to access directly onto arterials.
2. Refer to section 10.03 for intersection sight distance requirements.
3. Refer to section 10.05 for intersection pedestrian accessibility requirements.
10.04.02 Horizontal Approach Angle
The horizontal approach angle of public street intersections shall be between 85 and 95 at the
centerlines of intersecting streets.
10.04.03 Intersection Approach Offsets
Intersections shall be aligned so that opposing single left turn lanes and through lanes are not
offset more than 4 feet as measured from the lane centerline approach tangent.
10.04.04 Curb and Right-of-Way Radius
A minimum curb radius is required at intersection corners for vehicles to safely execute a right
turn at a reasonable rate of speed without crossing lanes or encroaching onto the adjacent curb.
The right-of-way radius is the additional radius required to install sidewalks, landscape strips,
and other roadway appurtenances. Additional right-of-way may be required near intersections
to accommodate auxiliary traffic lanes and equipment for existing or future traffic signals and
street lights. These minimum values and listed in Table 10-1 (included at the end of Chapter
10).
10.04.05 Landing Approach
The landing approach is a defined segment of the street before the intersection and is measured
back from the point of tangency of the curb radius on each approach to the intersection. The
requirements for minimum landing approach length and maximum landing approach grade are
listed in Table 10-1 (included at the end of Chapter 10) Street Crowns.
Intersections shall be designed to drain away from the higher classification street. Grades shall
match at the center of intersections for equal classification streets. At intersections of differing
Issued January 2022 City of Auburn
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classification streets, the crown shall be carried through the intersection for the higher
classification.
10.04.01 Intersection Control (Local Residential Streets)
The City’s preferred approach towards intersections of local residential streets is that all
approaches would have adequate sight distance for yield control. This can be achieved through
traffic circles, roundabouts, speed management/traffic calming, grading, and
vegetation/structure management of the intersection corners. New intersections of only local
residential streets will be designed with either bulb-outs or a center traffic circle such that stop or
signal control of all legs is not needed. Projects creating new intersections or modifying existing
intersections of local residential streets are required to provide analysis and documentation
justifying the proposed intersection control approach.
10.05 Driveways
All driveways, shall be approved by the City Engineer prior to construction. The following sections
contain design criteria for driveways. These criteria are minimum values and may need to be modified
according to safety factors, traffic volumes (existing and/or projected), topography, design speed,
design vehicle requirements, drainage, and other conditions, both existing and projected.
Driveways shall be sized and spaced per City of Auburn Standard Detail T-04 and as specified
herein.
Driveway aprons shall be constructed per City of Auburn Standard Detail T-34 or T-35. Selection
of the appropriate driveway apron type requires consideration of existing conditions adjacent to the
driveway and grades of the driveway connection behind the apron. Separating the driveway apron
from the pedestrian path is the City’s preferred approach (City of Auburn Standard Detail T-34)
and shall be implemented unless existing conditions present constraints that warrant the use of a
drop driveway (City of Auburn Standard Detail T-35) as accepted by the City.
Work that requires any portion of a driveway apron to be replaced triggers the requirement to
upgrade/replace the entire driveway to meet ADA standards.
10.05.01 Driveway Classifications
Driveways can be broken into the following classifications:
A. Residential Driveways – Residential driveways shall be used when serving single family
residence(s) that are not connected to the right of way via an access tract, which requires
a commercial driveway.
B. Commercial/Industrial Driveways – Driveways to all properties except single family
residential. The three categories of Commercial/Industrial driveways described below will
be determined based on the vehicles expected to use the site.
1.Light Commercial/Industrial - Used for sites where the average vehicle
use will range from passenger vehicles to small size delivery trucks.
Examples include mini marts, strip malls, fast-food restaurants, triplexes,
and small apartment buildings.
2.Medium Commercial/Industrial - Used for sites where the average
vehicle use will range from medium to high volumes of passenger
vehicles to multiple medium delivery trucks per day and the occasional
large tractor/trailer delivery truck. Examples include supermarkets, large
outlet stores, shopping malls, large apartment buildings, and busy retail
stores located on arterials.
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3.Heavy Commercial/Industrial - Used for sites where high volumes of
medium to large tractor/trailer trucks enter and exit every day. Examples
include manufacturing and storage warehouses.
Driveway uses discussed above may be subject to change based on the street
classification on which they are located. For example: a site use that may normally fall
under the light commercial/industrial classification may be upgraded to a medium
commercial/industrial classification if it is located on a principal or minor arterial to facilitate
moving vehicles off the right-of-way in a more efficient manner.
C. Temporary Driveways – Driveways to property allowed prior to and during construction
only.
D. Emergency Driveways – Driveways required by the fire department to provide an
alternative emergency-only access to the property.
E. Signalized Driveways – For special circumstances when no other option is available, the
City may allow signalized access to a public street from a private access. In such
situations, dedication to the City of any right-of-way necessary for maintaining and
operating the intersection will be required. Additional mitigation measures may be
required to ensure safe and efficient access to the public street. The private leg of the
intersection within the right-of-way shall be designed to the applicable public street
standard as determined by the City.
10.05.02 Driveway Locations
Regardless if a project includes one or multiples parcels, it will be limited to one driveway access
to a City street (including alleys) with the following exception: Single family residential
subdivision projects are allowed one driveway access to each single family residential parcel
when all of the driveway accesses for the project are to a local residential roadway, alley, or a
shared access tract/driveway. Subdivisions with a driveway access to a roadway classified
higher than local residential or for non-single family residential projects shall be limited to a single
access tract/driveway for the entire subdivision. In addition to the standard deviation criteria listed
in Section 1.04, deviation requests for multiple driveways on a parcel or development project
shall demonstrate that the multiple driveways do not create a safety concern or impede traffic
flow. A deviation is not required for a secondary driveway for emergency vehicle access only
that is provided to meet IFC requirements. Secondary driveways provided to meet IFC
requirements require a gate with knox lock.
To address safety or to mitigate impacts of traffic flow, the City may require two or more
contiguous properties to share a single driveway. When a property has frontage on two or more
streets (or alleys), the driveway will be located on the lowest classification of street (or alley).
Driveway accesses within the “Functional Intersection Boundary” shall be either prohibited or
restricted. See Table 10-4 and Figure 10-12.
The functional intersection boundary is the portion of the street leading up to the intersection
required to allow vehicle movements and storage. This is the area within which drivers identify
the situation, change lanes, come to a stop, and wait before proceeding through the intersection.
Driveways shall be either prohibited or restricted within the functional intersection boundary in
accordance with Table 10-4 and Figure 10-13. The functional length of an intersection is
measured from the point of curvature/point of tangency (PC/PT) of the curb return. Driveway
restrictions include prohibiting either all left turn movements, left turns out of, or left turns into
the subject driveway.
The City may also impose driveway restrictions at other locations when a safety hazard is
identified or to mitigate impacts of traffic flow along a classified street. Such restrictions shall be
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incorporated into the design of the driveway in conformance with the provisions of Section 10.05
in a manner that strives to maintain existing access turning movements to other properties in the
vicinity.
Development activities that trigger half-street improvements may be required to eliminate,
relocate or modify existing driveway access/accesses that do not meet current design standards.
Except for Local Residential Streets the spacing of driveways and their separation from
intersections shall meet the minimum “Functional Intersection Boundary” distances of this
Chapter.
Table 10-4 Distance Requirements for Functional Intersection Boundaries
Posted
Speed
(mph)
Speed
(ft./sec)
Reaction
Time
(sec)
Decision
Distance
(ft.)
“d1”
Lane Change
Distance
(ft.)
“d2”*
Braking
Distance
(ft.)
“d3”
Storage
Length
(ft.)
“d4”
Distance A
(Approaching)
(ft.)
Distance A
(Departing)
(ft.)
Distance B
(ft.)
25 37 1.0 37 25 60 50 135 80 172
30 44 1.0 44 40 86 50 176 107 220
35 51 1.0 51 60 118 100 278 140 329
40 59 1.0 59 85 154 100 339 179 405
45 66 1.0 66 105 194 100 399 216 465
* For single lane approaches where a lane change is not possible, “d2” should be omitted.
Figure 10-12 Functional Length Diagram of an Intersection with Right and/or Left-Turn Lane
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Figure 10-13 Functional Intersection Boundary Restricted Access Diagram
10.05.03 Driveway Lay Out
See City of Auburn Standard Detail T-04.
Driveways shall be designed in such a manner as to allow for efficient and safe ingress and
egress from the City streets. Driveways and on-site parking, other than that for single-family
residences on local residential street or alleys, shall be designed such that vehicle-backing
maneuvers will not occur onto the street. A properly designed driveway shall allow the largest
typical vehicle that will use the driveway (i.e. tractor-trailers at large warehouses, delivery trucks
at mini marts) to enter and exit the site without encroaching into opposing traffic (including two-
way left turn lanes).
Driveway aprons for adjacent properties shall be separated by a minimum of 10 feet for
residential and 50 feet for commercial/industrial. This distance is to be measured from the
outside edge of the driveway apron. When this separation is not obtainable, a single driveway
centered on the property line may be required.
When designing site layout and driveway access, internal circulation shall be such that on-site
traffic will not backup the driveway impeding vehicles in the public street. The City may require
sites with internal traffic congestion to design driveways with long throat lengths to provide extra
storage to avoid impacting City streets.
Per Auburn City Code 18.52.050, commercial and industrial driveways shall have at least a 40
foot throat from the street (not be intersected by parking aisle, parking space, or another access
driveway for a minimum distance of 40 feet from the street right-of-way). The City Engineer may
require additional throat distance or may allow less throat distance with the consideration of the
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following: classification and volumes of street from which access is being taken, total number of
parking stalls, design vehicle for parking lot, size of parcel and parking area to which the driveway
is providing access, and queueing analysis. If a gate is proposed across a driveway it shall be
located a minimum distance of the largest vehicle accessing the site (excluding emergency
vehicles), measured from the right-of-way line, unless there is adequate room for parking outside
the travel lane(s).
Driveways connecting non-single family residential development to non-local roadways shall
accommodate waste management and other service vehicles serving the development such that
the service vehicles do not stop on the roadway (they enter the site, perform services, and exit
the site).
10.05.04 Driveway Alignment (Horizontal and Vertical)
The angle of driveway throats to the City streets shall not be less than 85 degrees or greater
than 95 degrees unless a “pork chop” or other access control device is allowed to be utilized per
Section 10.15.
The vertical grade behind the driveway shall not exceed 5% for a distance of 12 feet beyond
back of sidewalk or right of way line except for the alternate driveway type per City of Auburn
Standard Detail T-35 where the 5 foot driveway ramp grade may be up to 10%. Driveways shall
be designed to preclude vehicles from dragging when entering or exiting the site. Driveways shall
meet all sight distance requirements per Section 10.02.09.
10.05.05 Driveway Widths
See City of Auburn Standard Detail T-04.
Driveway widths are measured across the driveway throat and do not include driveway
wings/ramps. Residential driveway widths shall be a minimum of 11 feet and a maximum of 18
feet. The allowed width of Commercial and industrial driveways shall be based on the number of
lanes used on the driveway and the type of use. Light commercial/industrial driveways shall
have one entering lane and up to two exiting lanes with the lane widths restricted to a maximum
of 12 feet. Medium commercial/industrial driveways shall have one entering lane and up to two
exiting lanes with the lane widths restricted to a maximum of 14 feet. Heavy commercial/industrial
driveways shall have one entering lane and one exiting lane with the lane widths restricted to a
maximum of 16 feet. Additional driveway apron width will be considered during plan review if
turning templates for the largest anticipated vehicle entering/exiting the site are provided.
10.05.06 Restricted Access Driveways
Restricted Access Driveways are used to restrict turning movements out of or into driveways.
Turning restrictions at driveway locations shall be by one or more of the following methods as
deemed appropriate by the City:
A. Median Islands (See Section 10.16.01)
B. Mountable Curbs (See Section 10.16.02)
C. Pork Chops (See Section 10.16.03)
D. Signing (See Section 10.16.04)
E. Pavement Markings (See Section 10.16.05)
F. Pedestrian Sight Distance (See Section 10.02.09)
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10.05.07 Private Access Roads on Access Tracts or Easements (Shared
Driveways)
See City of Auburn Standard Detail T-31.
Access roads that provide access to panhandle/flag lots and rear lots that do not have direct access
to the public street frontage are typically provided on access tracts or easements and are commonly
referred to as “shared driveways.” Access roads are privately owned and shall be maintained by the
property owners who use them to access their property or as otherwise stipulated in the tract or
easement dedication documents (except that maintenance of access roads shall not be the
responsibility of the public).
All access roads shall meet the following general standards:
1. Access roads serving residential lots shall be limited to 6 or less residential units. See Note A
below..
2. Access roads shall be limited to 600 feet in length. See Note A below.
3. Minimum widths of access/tract easements shall be 22 feet for access roads serving 2 or less
residential units, 26.5 feet for access roads serving 3 or more residential units, 35 feet for
access roads serving commercial use(s), and 41 feet for access roads serving industrial use(s).
See Note A below.
4. Minimum pavement width for vehicle egress/ingress shall be 20 feet for access roads serving
residential unit(s), 24 feet for access roads serving commercial uses, and 30 feet for access
roads serving industrial uses. The access road shall be identified as a fire lane with pavement
markings or signage. For access roads serving residential unit(s) see Note B below.
5. Edges of access roads without curb/gutter and sidewalk will have an asphalt wedge curb per
City of Auburn Standard Detail T-41, along the edge(s) to which the roadway drains, if any.
See Note A below.
6. Access roads with any existing or anticipated future public utilities shall meet the geometric
design standards for local residential streets. See Note A below.
7. Access roads without any existing or anticipated future public utilities shall meet the geometric
design standards for local streets except that vertical grades may be increased up to 12% given
that all other geometric design and driveway criteria are met including the requirement that a
5% landing be provided for the driveway.
8. Access roads that serve 2 or less residential units do not require sidewalk along the access
road. Access roads serving 3 or more residential units require sidewalk, curb and gutter along
one side of the access road. Access roads serving commercial or industrial property(s) require
sidewalk, curb and gutter along both sides of the access road. The minimum sidewalk width
shall be 5 feet (not including curb) and shall be separated from the vehicular egress/ingress
with curb and gutter. Where sidewalks are required and the residential units are along only one
side of the access road, the sidewalk shall be placed on the side of the road with the residential
units. See Note A below.
9. Driveway connections to the access tract shall be configured such that vehicles backing out of
the driveways complete their maneuvers within the access tract without entering another
property.
10. The connection of an access road to the public street shall be by a commercial driveway
apron. The connection of individual lots to the access road shall be by either a residential or
commercial driveway apron commensurate with the use of the property.
11. Access roads shall be signed as private drives inclusive of all addresses being served off the
access road per City of Auburn Standard Detail T-26.
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12. Access roads exceeding 150 feet in length shall include a turnaround at the end of the road. If
a hammerhead configuration is utilized for the turnaround, it shall be designed per Figure
D103.1 in Appendix D of the International Fire Code. If a cul-de-sac is utilized for the
turnaround, it shall be designed per the City of Auburn Design Standards. The turnaround area
must be paved and lie entirely within the access tract or easement. See Note B below.
13. Access roads shall include storm drainage facilities in accordance with Chapter 6 of these
standards.
Note A: May be excluded for Development of a single family residence on an existing platted
lot that only has access to an existing shared driveway where inclusion of the
requirement would require additional property rights beyond the applicant’s control,
modification of existing building and structures, impacts to critical areas, or other
reason as deemed acceptable by the City Engineer.
Note B: Requirement may be waived by City Fire Official for Development of a single family
residence on an existing platted lot that only has access to an existing shared
driveway where inclusion of the requirement would require additional property rights
beyond the applicant’s control, modification of existing building and structures,
impacts to critical areas, or other reason as deemed acceptable by the City Engineer.
10.06 Sidewalks
Sidewalk requirements vary by street classification and corridor/area specific standards as determined
by the City. Sidewalks are required along both sides of all street classifications except for rustic streets.
See City of Auburn Standard Details T-13 & T-15. Pervious sidewalks (where authorized for use by
the City Engineer) shall be per City of Auburn Standard Detail T-14.
10.06.01 Sidewalk Widths
Sidewalks shall be a minimum of 5 feet in width for all local residential and residential collector
streets. Sidewalks shall be a minimum of 10 feet in width for all principal arterials, minor arterials,
non-residential collectors, and local non-residential streets. Non-standard widths of sidewalk
greater than the standards identified above may be required to maintain continuity on existing
corridors. Sidewalk widths in the Downtown Urban Center (DUC) Zone shall be a minimum of 10
feet in width as measured from face of curb to face of building or Right-of-way.
10.06.02 Meandering Sidewalks
The City Engineer may approve meandering sidewalks along a corridor when the sidewalk,
landscaping, lighting, signing, right-of-way, and other surface features are integrated into the design
of the improvements. Additional right-of-way (or an easement) may be required to accommodate the
meander of the sidewalk and other surface features.
10.06.03 Accessibility
All sidewalk cross slopes shall be designed to 1.5% and not exceed 2%. Sidewalk grade shall not
exceed the grade of the adjacent street centerline, except at driveways and curb ramps. All sidewalks
shall maintain a minimum walking zone of 5 feet in width, free of all obstructions including utilities,
signage, street trees, furniture or other elements, permanent or temporary. Sidewalks require a
minimum overhead clearance from trees and vegetation of 7-feet when the trees and a minimum
overhead clearance of 10-feet from all other objects.
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10.06.04 Downtown Sidewalks
Sidewalks shall be per City of Auburn Standard Detail T-15 and will also include a 2-foot x 2-foot
square scoring pattern with a light broom finish with minimal scoring depth to allow for easy cleaning.
Sidewalks shall be a minimum of 10 feet in width.
Sidewalks shall maintain a minimum walking zone of 5 feet in width, free of all obstructions including
utilities, signage, street trees, furniture or other elements, permanent or temporary.
A single row of bricks shall be used at transition points such as driveways per in City of Auburn
Standard Detail T-44.
10.06.05 Curb Ramps
See WSDOT Standard Plans F-40.12, F-40.15 & F-40.16.
Curb ramps shall be provided at all intersections and pedestrian crossings having vertical curb
sections. Every curb ramp shall have at least one receiving ramp. In special conditions, curb
ramps shall also be provided to enable passage across curbed radius return access points. All
curb ramps shall have detectable warning patterns formed with manufactured truncated domes
in accordance with WSDOT Standard Plan F-45.10. Truncated dome color shall be yellow
except in the downtown urban core area where truncated dome color shall be brick red. Pervious
cement concrete ramps and landings shall not be allowed.
For any deficient element that does not meet ADA requirements, designers shall document the
deficiency via a Maximum Extent Feasible (MEF) document stamped and signed by a
professional engineer. The MEF document will be reviewed for acceptance by the City. MEF’s
shall also be documented on the Plans with a notation indicating the deficiency and that the
curb ramp was designed to the MEF.
Trenching work and the associated patching and surface restoration that traverse
crosswalks/pedestrian pathways (crossings) shall not trigger the requirement to replace curb
ramps that do not meet current ADA standards at the crossing, unless, the cumulative width of
surface restoration at the crossing for all work associated with the project equals or exceeds
half of the crossing width, as measured from curb face or pavement edge at the pedestrian
pathway entry into the vehicle travel way to curb face or pavement edge at the pedestrian
pathway departure from the vehicle travel way. This distance is measured through medians,
islands, and other pedestrian refuge areas. If the cumulative width of all surface restoration at
a crossing equals or exceeds half the crossing width, then the curb ramp(s) that intercept the
impacted crosswalk that do not meet current ADA standards must be upgraded/replaced,
including signal push-button replacement/relocation where applicable per Section 10.16.13.
Whenever any portion of a curb ramp or intersection corner without a curb ramp is replaced or
upgraded for any reason, the entire curb ramp or a new curb ramp is required to meet ADA
standards and installation of curb ramp(s) on the receiving end(s) is required if not present.
10.06.06 Downtown Street Corners
Corner bulbs shall be integrated into corners where on-street parking is allowed, dependent upon
the adjacent street geometry, presence of bus routes or other large vehicle use, as determined by
the City Engineer.
All street corners where a corner bulb is required or where at least 1 leg of the street corner has
sidewalk that are at least 10-feet wide shall be constructed of brick pavers in a rectangular pattern
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as shown in the figure below. The specific type of brick pavers shall be approved by the City,
including shape, size, and color.
The bulbout layout and limits shall generally be as depicted in Figure 10-3 below.
Figure 10-3 Downtown Street Corner Illustration
An existing street corner that does not meet the requirements of the Guidelines shall be re-built in
its entirety to meet the requirements of the Guidelines with the construction of a partial or full
replacement of 1 or more curb ramps at the street corner.
10.07 Bikeways
The City of Auburn bikeway standards are designed to ensure that bikeways are constructed in a manner
that provides a safe and convenient network of interconnected routes for bicycling.
Bikeways are any road, street path or way which in some manner is specifically designated for the
exclusive use of bicycles or are to be shared with other transportation modes. Bikeway facilities shall be
incorporated into development and transportation projects in accordance with the Future Trail and Bicycle
Network plan adopted by the City of Auburn Comprehensive Transportation Plan.
Bikeways shall be designed in accordance with AASHTO’s current “Guide for the Development of Bicycle
Facilities” the latest adopted edition of FHWA’s Manual on Uniform Traffic Control Devices (MUTCD),
this section, and applicable City of Auburn standard details.
The City of Auburn’s Future Trail and Bicycle Network consists of various classification bikeways.
Typically, these bikeways are shared with other transportation modes, although they may be provided
exclusively for bicycle use. Bikeways are categorized as follows: Class 1 Bikeways, Class II Bikeways,
Class III Bikeway, and Class IV Bikeways
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10.07.01 Class I Bikeway
Class I Bikeways are facilities shared with other non-motorized modes and are physically separated
from motorized vehicle roadways. For the purposes of this section, Class I Bikeway design standards
are for bicycle facilities that generally parallel a roadway with minimal crossflow by motor vehicles.
When required, Class I Bikeways shall be designed for two-way traffic. Class I Bikeways that are part
of the City’s Future Trails and Bicycle Network shall be public and shall be located within the public
right-of-way, tracts or easements.
Class I Bikeways separated from the roadway pavement section (Class I) shall be either asphalt or
cement concrete, at the discretion of the City. Asphalt bikeways shall have a minimum pavement
section of 2 inch thick CL ½” asphalt concrete pavement over 6 inches of Crushed Surfacing Base
Course (CSBC). Cement concrete bikeways shall be per City of Auburn Detail T-15. When the
California Bearing Ratio (CBR) of the existing soil is less than 5, an additional 6 inches of gravel base
shall be required. When the trail is also utilized as a vehicular service road, the pavement design shall
be the Access Road classification on Table 10-5. Class I Bikeways shall be separated from the
vehicular travel way by a landscape strip/buffer with a minimum 5 foot width.
Where Class I Bikeways are intersected by driveways appropriate signing and pavement markings
shall be provided consistent with requirements for midblock crossings.
Class I bikeways shall have a minimum width of 10 feet.
10.07.02 Class II Bikeway
Class II Bikeways, or “Bike Lanes,” are incorporated within the street right-of-way. Bike lanes are
established on streets in corridors where there is a current of anticipated bicycle demand and where
it would be unsafe for bicyclists to ride in travel lanes. Bike lanes shall be provided in accordance with
the Future Trail and Bicycle Network plan pursuant to the City of Auburn Comprehensive
Transportation Plan. Bike lanes are exclusive one-way bicycle facilities delineated by pavement
markings and signing. Bicycle traffic is carried in the same direction as the adjacent motorized vehicle
traffic.
Bike lanes shall have a minimum width of 6 feet as measured from nearest edge of the travel way to
face of curb, edge of pavement, or edge of parking lane. Bike lanes shall have the same pavement
section as the adjacent roadway.
10.07.03 Class III Bikeway
Class III Bikeways, or “Shared Lane,” are facilities shared by bicyclists and motorized vehicles. Class
III Bikeways will be utilized, in accordance with the Future Trail and Bicycle Network plan, on existing
streets as interim bike corridors until a Class I or Class II facility can be provided. Class III Bikeways
may or may not be delineated with shared use pavement markings and signage. Generally, lower-
speed/lower-volume streets are adequate for bicycle travel, so additional signing and pavement
markings for bicycle use are unnecessary.
10.07.04 Class IV Bikeway
Class IV Bikeways consist of all improved roadways unless otherwise designated as Class I, Class II,
or Class III Bikeways.
10.07.05 Bikeways at Railroad Crossings
Railroad-Bikeway grade crossings shall be designed as near perpendicular as possible. If rail crossing
is less than 45 degrees, an additional paved shoulder of sufficient width shall be provided to permit
the bicyclist to cross the track at a safer angle. Where this is not possible and train speeds are low,
Issued January 2022 City of Auburn
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compressible flangeway fillers will be required. When not under City control the railroad owner shall
be responsible for bicycle crossings.
10.07.06 Bikeways at Roundabouts
Class I Bikeways at roundabouts shall be combined with the adjacent sidewalk, if applicable; to create
a single shared use crossing through the roundabout zone.
Class II and Class III Bikeways shall be terminated a minimum of 65 feet in advance of roundabouts
using appropriate signing and striping with transitions to the adjacent pedestrian facilities which shall
be enhanced through the roundabout zone, consistent with a Class I Bikeway, to accommodate the
shared use with bicycles.
10.07.07 Bikeways at Signalized Intersections
Class I Bikeway crossings at signalized intersections shall be combined with the adjacent sidewalk, if
applicable, to create a single shared facility utilizing the protected pedestrian crossing at traffic signals.
Class II and Class III Bikeways shall be provided an optional transition to the adjacent pedestrian
facilities a minimum of 50 feet in advance of traffic signals using appropriate signing and striping. The
adjacent pedestrian facility shall be enhanced to Class I Bikeway standards in advance of the
transition point to accommodate the shared use through the intersection.
10.07.08 Bikeways at Un-signalized Intersections
Class I Bikeway crossings at un-signalized intersections shall be combined with the adjacent sidewalk,
if applicable, to create a single shared use crossing. Class II Bikeways shall be delineated in
accordance with City of Auburn standard details and MUTCD bike lane requirements for intersections.
10.07.09 Bikeway Pavement Markings, Signing, and Striping
See City of Auburn Standard Detail T-17 and WSDOT Standard Plan M-9.50
Pavement markings, signing, and striping for bikeways shall be designed in accordance with City of
Auburn standard details and Manual of Uniform Traffic Control Devices (MUTCD) requirements.
10.08 Pavement Design
This section of the Standards has been prepared for engineers to use in the design of pavement
sections for City streets. The use of the following information will ensure that paved transportation
corridors are adequately built or improved in a uniform and consistent manner. Except where indicated
otherwise herein, all references to pavement refer to standard pavement sections and not to permeable
pavement.
The simplified pavement design approach described in Section 10.08.01 may be utilized as a simplified
approach to determine the required pavement section except for the following streets for which
pavement sections must be designed per the current AASHTO design procedure by a Professional
Engineer:
Principal arterials
Streets where the daily average traffic count is expected to exceed 15,000 vehicles per day
Streets where truck and bus traffic is expected or encountered, such as freight routes and
bus routes
Issued January 2022 City of Auburn
Engineering Design Standards Page 136
Freight routes
Streets where subgrade California Bearing Ratio (CBR) values are less than 3
Freight routes are defined in the “City of Auburn Comprehensive Transportation Plan”. Studies shall
be performed along the freight route to determine the vehicle mix and volumes.
10.08.01 Simplified Pavement Design
The simplified pavement design approach may be utilized to determine pavement sections for
City streets except for the streets listed in Section 10-07. This simplified approach has been
developed so that extensive data and computer analysis is not necessary for developing
pavement designs for most projects. The approach requires determination of the street’s
subgrade conditions and street classification which are then utilized with Table 10-5 to
determine the required pavement design section.
Simplified Pavement Design - Street Classification
The classification of a particular street, (i.e. Residential Collector), can be obtained from the City
of Auburn. The classification of a street will be required to determine the volume and mix of
vehicles for which it is designed.
In some cases, where a street has yet to be designated a specific classification, street pavement
shall be designed based on the anticipated traffic volume. An anticipated daily traffic count can
be obtained from the City of Auburn for the street in question or a similar street that functions in
the same manner. The City may, however, require the applicant to obtain additional traffic
information, as warranted.
Simplified Pavement Design - Street Subgrade
For the purpose of the simplified pavement design, the California Bearing Ratio (CBR) shall be
used to classify the type of existing subgrade soils. The scope of this section does not cover
existing subgrade with a CBR less than “3”. When the CBR is less than “3”, the simplified
pavement design approach is not allowed.
The subgrade under the proposed street shall have its CBR evaluated by an independent testing
laboratory or geotechnical firm. The proposed roadway shall have a minimum of one CBR test
for every 1,000 feet of road and/or for every obvious change in subgrade material.
Issued January 2022 City of Auburn
Engineering Design Standards Page 137
Table 10-5 Simplified Pavement Section Design Chart
Poor Soils
(CBR 3-5)
Medium Soils
(CBR 6-10)
Good Soils
(CBR 11-20)
Excellent
Soils*
(CBR >20)
Private Streets
Alleys
Paved Access
Roads
Rustic Residential
2” HMA CL 1/2”
4” HMA CL 1”
11.5” CSBC
Geotextile Fabric
2” HMA CL 1/2”
4” HMA CL 1”
7.5” CSBC
2” HMA CL 1/2”
4” HMA CL 1”
4” CSBC
2” HMA CL 1/2”
3” HMA CL 1”
4” CSBC
Unpaved Utility
Access Roads
2” CSTC
12” Base Course
Geotextile Fabric
2” CSTC
8” Base Course
2” CSTC
8” Base Course
2” CSTC
8” Base Course
Local Streets 2” HMA CL 1/2”
4” HMA CL 1”
11.5” CSBC
Geotextile Fabric
2” HMA CL 1/2”
4” HMA CL 1”
7.5” CSBC
2” HMA CL 1/2”
4” HMA CL 1”
4” CSBC
2” HMA CL 1/2”
3” HMA CL 1”
4” CSBC
Residential
Collectors
Rustic Collectors
3 ” HMA CL 1/2”
4” HMA CL 1”
14.5” CSBC
Geotextile Fabric
3” HMA CL 1/2”
4” HMA CL 1”
9” CSBC
3” HMA CL 1/2”
4” HMA CL 1”
5.5” CSBC
3” HMA CL 1/2”
3.5” HMA CL 1”
4” CSBC
Non-Residential
Collectors
3” HMA CL 1/2”
4” HMA CL 1”
14.5” CSBC
Geotextile Fabric
3” HMA CL 1/2”
4” HMA CL 1”
9” CSBC
3” HMA CL 1/2”
4” HMA CL 1”
5.5” CSBC
3” HMA CL 1/2”
3.5” HMA CL 1”
4” CSBC
Minor Arterials 3” HMA CL 1/2”
6 HMA CL 1”
18.5” CSBC
Geotextile Fabric
3” HMA CL 1/2”
6” HMA CL 1”
11” CSBC
3” HMA CL 1/2”
4” HMA CL 1”
9.5” CSBC
3” HMA CL 1/2”
4” HMA CL 1”
6” CSBC
*For engineered pavement designs, no pavement design total asphalt thickness shall be less than the
minimum pavement thicknesses identified in this column.
10.08.02 AASHTO Pavement Design
Engineered pavement designs shall follow the latest “AASHTO Guide for Design of Pavement
Structures” for flexible pavements. For principal arterials no pavement section with an asphalt
thickness of less than 7 inches shall be allowed.
Issued January 2022 City of Auburn
Engineering Design Standards Page 138
For projects where a traffic analysis report was not required, to determine the amount of traffic for
which a street is to be designed, contact the City to obtain the most recent street classification and
traffic counts. Traffic counts are done assuming there is a 50/50 split in the direction of traffic. 100%
of the 50/50 split must be assumed in the design lane, regardless of the number of lanes in each
direction. (Additional traffic information may be required.)
The existing traffic levels shall then be inflated to match the projected traffic at the end of the
roadways design life (in most cases a twenty-year design life will be used). The annual rate of
growth is 1.5% for residential streets and three and 3.5% for commercial/industrial streets and
arterials streets. The growth rate may be waived in closed subdivisions with City approval. The
minimum pavement section shall be as determined by the pavement design using the AASHTO
pavement design approach with a 20-year service life.
The Reliability Level factors used in pavement design shall be in accordance with the following table:
Table 10-6 Pavement Design – Reliability Factors
Required Level of ReliabilityFunctional Classification Urban Rural
Principal Arterials 95 90
Minor Arterials 90
Collectors 90
Local 85
10.08.03 Pavement Design Report
All pavement designs (whether per the AASHTO method or per the simplified approach) shall be
documented in a Pavement Design Memorandum stamped and signed by a Professional Engineer
and may be included in the project Geotechnical Report where applicable.
The report shall include a narrative of the site conditions, geotechnical boring logs, testing results,
calculations, the pavement analysis, and applicable background information for review and
approval. The report must contain all calculations regarding the pavement design including,
spreadsheets, all variables and assumptions, as well as geotechnical engineering information on
the subgrade soils.
10.08.04 Permeable Pavements for Roads, Access Tracts, and Shared
Driveways
Pervious Cement and Porous Asphalt Concrete Pavement within roads, access tracts, and shared
driveways must be designed by a professional engineer. The design shall be documented by a
report that includes relevant calculations, data collection, and assumptions. The report must provide
evidence that the permeable surfaces are designed to have at least a 30-year service life given the
anticipated vehicle counts and classifications. The minimum pavement design section shall be as
follows:
6-inch thick wearing course of porous asphalt or pervious concrete; over
6-inch to 36-inch thick reservoir course (Permeable Ballast per Section 9-03.9(2) of
the Construction Standards); over
Geotextile (Non-Woven, Moderate Survivability per Section 9-33.2(1) of the
Construction Standards); over
Issued January 2022 City of Auburn
Engineering Design Standards Page 139
Where treatment is required and native subsoils do not meet water quality design
criteria per the SWMM: 18-inch to 24-inch runoff treatment layer with specifications
per the SWMM.
Permeable pavements shall be designed and constructed per the SWMM and the Construction
Standards. Maximum allowed longitudinal slopes for pervious pavements shall be 5%. Longitudinal
slopes exceeding 2% shall require check dams or other methods to maximize ponding in the
subsurface to allow adequate treatment and infiltration. Underdrains shall not be allowed.
Pervious cement and porous asphalt concrete pavement within the public right-of-way shall not be
utilized for storm water management of runoff from areas outside the public right-of-way.
10.08.05 Pavement Surface Restoration and Preservation
When the total surface restoration area exceeds 1,000 SF feet, pavement core sample(s) are
recommended to be collected in the required restoration area to determine the existing pavement
thickness. Where the existing pavement to be removed and replaced does not meet current City
standards, full depth pavement replacement may be required as directed by the City Engineer.
10.09 Street Landscaping
An area devoted to landscaping is included within the right-of-way of various street classifications. This
landscaping is an integral part of the roadway cross-section. It can serve several important functions,
including improving pedestrian safety by providing a buffer between traffic and the sidewalk; providing
the perception of a narrower travel corridor, thereby slowing traffic; improving air quality; and improving
the aesthetic appearance of the street. Street landscaping strips may also be constructed as
bioretention swales to provide storm water collection, treatment, and infiltration.
10.09.01 Landscape Strips
Landscape strips are required for local residential streets and residential collector streets.
Landscape strips shall be located between the back of the curb and the sidewalk. Landscape strips
requirements:
The minimum allowed landscape strip width is 5 feet.
Landscape strips shall be planted with grass or shrubs, vegetation groundcover,
and street trees. Shrubs and vegetative groundcover must be low maintenance,
minimal debris dropping, and not present a tripping hazard to pedestrians.
Landscape strips shall not include gravel, rocks, artificial turf, or other aggregate.
Roadways, driveways, lighting, fire hydrants, junction boxes, water meters and
other appurtenances shall be configured such that no landscape strip has a net
landscaped surface area (landscape strip area minus areas occupied by non-
landscape features) of less than 50 SF and no portion of a landscaped surface
within a landscape strip has a width less than 2 feet. To satisfy these size
requirements, landscape strip areas may not be “filled in” with sidewalk, driveway,
or other non-landscaped surfaces. Instead, the alternate roadway sections shown
in Figure 10-06A and 10-06B shall be utilized to ensure that the minimum
landscape size requirements are met. These minimum size Requirements shall
also apply to bio-retention swales.
In order to meet the minimum size and width requirements listed above,
landscape strips/areas may be omitted from one side of the roadway and widened
to 8.5 feet wide on the other side of the roadway. The width of the sidewalk on the
Issued January 2022 City of Auburn
Engineering Design Standards Page 140
side of the omitted landscape strip is required to be increased to 7.5 feet. No
parking shall be signed on the side of the widened landscape area. See Figure
10-06A. The configuration shall be alternated (the side with the landscape
strip/area switched from one side to the other) to support traffic calming and
drainage.
Widened landscape strips/areas may be constructed as bioretention swales as
shown in Figure 10-06B. Bioretention swales in the public right-of-way shall be
designed to collect, treat, and infiltrate runoff from the public right-of-way. If, after
runoff from the public right-of-way has been accounted for, additional capacity
remains in the bioretention swale, the bioretention swale may be utilized to treat
and infiltrate runoff from adjacent private single family residential property(s) with
a maintenance agreement between the City and property(s) draining to the swale
that requires those property(s) to maintain the swale in perpetuity. The
bioretention swale shall be designed and constructed in accordance with the
SWMM.
Landscape strips shall generally be graded towards the curb at approximately
1.5%. Other grades may be allowed where it can be demonstrated to not cause
drainage or maintenance issues.
10.09.02 Street Trees
Street trees are required for local residential streets, residential collector streets, and streets within
the DUC zone. Street trees shall be placed either within the sidewalk in tree pits with tree grates,
or in landscape strips. Where landscape strips are constructed as bio-retention swales, street trees
shall not be placed in the bio-retention swale and may be required elsewhere depending on the
extent of landscape strips constructed as swales. Potential alternative locations include on the
private property(s) and/or tract(s) adjacent to bio-retention swale(s).
Placement and Spacing
Trees shall be placed so that they do not obstruct the view of any street intersection, driveway,
or visibility of any traffic control device or sign. Sight distance triangles shall be used to analyze
visibility at street intersections. Trees shall be located in the landscape strip as shown on the
typical roadway sections included in these standards. When the roadway section does not
include a landscape strip, but street trees are required, trees shall be placed in tree wells with
tree grates within the sidewalk per City of Auburn Standard Detail T-30.
Nearby features such as street lighting, in-ground utilities, buildings or overhead wires will also
affect where trees should be located. Minimum size for street trees shall be a 2-inch caliper,
measured 2 feet above the root ball.
Minimum spacing for street trees should be 1-1/2 times the mature diameter of the tree canopy
as identified in Table 10-7A.
Planting Next to a Building: Where a building is placed close to the sidewalk, the mature size
of a tree should be considered when selecting species. Trees with a pyramidal, columnar, or
oval shaped canopy are preferable; a tree with a round head is generally unsuitable in this
situation.
Overhead Wires: When trees must be planted directly under or when the mature canopy is
within 12 feet of overhead utility lines, species with a mature maximum height of 25 feet must be
selected.
Issued January 2022 City of Auburn
Engineering Design Standards Page 141
Street Lighting: Trees need to be located at least half their mature canopy width or 20 feet from
street lights, whichever is greater. Planting locations should be coordinated with locations of
street lights.
Street Signage: Trees shall be planted to avoid blocking the view of street signage.
Underground Utilities: Trees shall be planted so as to avoid impacts on underground utilities.
Clearance: Trees shall be pruned as they grow to provide at least 8 feet vertical clearance
above sidewalks and 14 feet of vertical clearance above roadway surfaces.
Root Direction Devices
All street trees shall use a root direction device to deflect tree roots downward into the soil. Any
tree planted on public or private property within 10 feet or less of a sidewalk or curb shall be
planted with a root directional device. These devices are used to reduce damage to sidewalks
as the tree roots extend beyond the original planting pit.
The root barrier shall be placed along two sides of the tree, parallel to the sidewalk and to the
curb line. Under specific circumstances, wider strips that contain utilities may also need root
barriers to reduce conflicts. Plan submissions shall indicate the location of root barriers and
provide a specification sheet on the product to be used.
Tree Planting Wells and Grates
Street trees planted in wells with grated covers are required along streets in the Downtown
Urban Corridor Zone (DUC Zone) and as designated by the City Engineer. Sidewalks that are
10-feet wide or wider require street trees with root barrier per City of Auburn Standard Detail
T-06 in grates per City of Auburn Standard Detail T-30. An exception to this requirement is
that street trees and grates are not generally required on Auburn Way North/South but may be
considered on a case-by-case basis with approval by the City Engineer.
Street trees are generally required to be installed at 40 feet to 50 feet on center and be located
2-1/2 feet from the back of curb. Street and pedestrian lighting should be placed in between the
street trees. Trees may be placed at either greater or lesser intervals to maintain sightlines for
safety, maintain adequate lighting levels, or for other reasons, subject to approval of the City
Engineer.
Tree Selection
Table 10-7A provides several acceptable species of trees. Many other trees are appropriate
and alternative selections may be proposed if desired. Alternative plant choices must be
evaluated and approved by the City. Needled evergreens shall not be allowed in landscape
strips. Trees with mature heights of over 35 feet shall not be allowed.
Selection of street trees should consider the following:
Size of the landscape strip
Canopy shape
The guidance offered below includes information about which tree canopy shapes work
best under different conditions. Table 10-7A offers information about tree species and
their canopy shapes:
Issued January 2022 City of Auburn
Engineering Design Standards Page 142
V-Shaped Trees: (sometimes also called “vase shaped”) have canopies that are
narrow toward the bottom and broad at the top. The American
Elm is a classic street tree with this shape. V-shaped trees may
have arching branches that form a canopy over both street and
sidewalk. They generally do not cause problems with overhead
power lines or traffic.
Pyramidal Trees: or cone-shaped are typically broad at the base of the canopy and
are somewhat pointed at the top. Planted close together,
pyramidal trees can screen unwanted views or create vistas.
Lower branches sometimes droop with age and may have to be
limbed up in later years to provide the needed clearance.
Round Trees: These are generally wide spreading trees that need more space
than other shapes.
Oval Trees: taller than they are wide and cause less interference with traffic.
Columnar Trees: useful in locations where there is little available room between the
street and buildings, awnings, or other features. Branches of
columnar trees tend to grow up rather than out. Many branch
lower than other types of trees without causing problems with
traffic or pedestrians.
Size and type of leaves
Root shape
Site environmental conditions, such as the amount of sunlight available or moisture in
the soil.
Aesthetic qualities desired.
Issued January 2022 City of Auburn
Engineering Design Standards Page 143
Table 10-7A Street Trees
Botanical
Name Common Name
Mature
Height
(ft.)
Mature
Canopy
Width
(ft.)
Landscape
Strips/
Grates
Medians
Canopy
Shape
H20
Req Sun Remarks
Acer campestre
Queen Elizabeth
Maple 'Evelyn'35 30 x Oval Mod
Sun/
part. sun Hardy tree
Acer ginnala
Amur Maple
'Flame'20 20 x Round Mod
Sun/
part. sun Good power line tree.
Acer
grandidentatum
Rocky Mt Glow
Maple 'Schmidt'25+15 x x Round Mod
Sun/
part. sun
Requires pruning for
clearance
Acer truncatum
x A. platanoides
Pacific Sunset
Maple 'Warrens
Red'30 25 x x Round Mod Sun Good fall colors
Amelanchier x
grandiflora
Serviceberry
'Princess Diana'20 15 x
Upright/
round Mod
Sun/
part. sun Small tree, red in fall
Amelanchier x
grandiflora
Serviceberry
'Autumn brilliance'20 15 x
Upright/
round Mod
Sun/
part. sun
Resistance to ice
breakage
Carpinus
betulus
Frans Fontain
Hornbeam 35 15 x x Col Mod Sun
Cercidiphyllum
japonicum
"Rotfuchs"Red Fox Katsura 30 16 x x Oval Mod Sun
Fagus sylvatica Red Obelisk 35 12 x x Col Mod Sun
Malus "Marilee"24 10 x x Cone Mod Sun
No fruit. Good power
line tree.
Prunus
Mt. St. Helens
Plum 'Frankthrees'20 20 x x Round Mod Sun
Hardy tree. Good
power line tree.
Prunus
Snow Goose
Cherry
'Snowgoose' 20 20 x
Upright
spreadin
g Mod Sun
Disease resistant.
Good power line tree.
Prunus
cerasifera
Flowering Plum
'Krauter Vesuvius'30 15 x x Round Mod Sun
Prunus sargentii
Cherry
'Columnarus'35 15 x x Col Mod Sun Fast grower.
Prunus
serrulata
Flowering Cherry
'Amanogowa'20 6 x x Vase Mod
Sun/
part. sun
Short lived. Good
power line tree.
Prunus x hillieri Cherry 'Spire'30 10 x x Col Mod
Sun/
part. sun Good fall colors.
Prunus x
yedoensis
Flowering Cherry
'Akebono'25 25 x
Round/
vase Mod Sun
Best pick for region.
Good power line tree.
Pyrus
calleryana Pear 'Redspire'35 25 x x Pyramid Mod Sun Susceptible to fire blight
Pyrus
calleryana
Pear 'Autumn
Blaze'30 25 x Round Mod Sun Susceptible to fire blight
Tilia americana Linden 'Redmond'35 20 x x Pyramid Mod
Sun/
part. sun tolerant to wet soil
Tilia cordata Linden 'DeGroot'30 20 x x Pyramid Mod
Sun/
part. sun
Tilia cordata
Chancelor Linden
'Chancole'35 20 x x Pyramid Mod
Sun/
part. sun Good street tree
Carpinus
betulus
Pyramidal
European
Hornbeam
'Fastigiata'35 25 x x Col Low
Sun/
part. sun
Very urban tolerant,
good street tree
Issued January 2022 City of Auburn
Engineering Design Standards Page 144
10.09.03 Ground Cover Planting
Table 10-7B provides several acceptable species of ground covers and, shrubs less than 3 feet
high. Many other types of plants may be appropriate and alternative selections may be proposed
if desired. Alternative plant choices must be evaluated and approved by the City. The SWMM
(Ecology Stormwater Management Manual, Volume V, Table V-7.5) shall be utilized to select
groundcover plantings within the wet areas of bio-retention facilities.
Groundcover shall be planted from either four-inch pot with 12-inch spacing or one-gallon pot with
18-inch spacing. Alternative spacing of particular species may be approved by the City if
documentation concerning the effectiveness of the groundcover is submitted with the landscape
plan.
Table 10-7B Ground Cover
Botanical
Name Common Name
Mature
Height (ft.)
Can be
utilized in:
M (Medians),
L (Landscape
Strips)
Minimum
Planting
Area Width
(ft.)
Sun/
Moisture
Obvious
Flowers
Arctostaphylos
Una-Ursi Kinnikinnick Bearberry 0.5 to 1 M, L 5 to 6'
Full sun to
partial
shade Yes
Ceanothus
Gloriosus California Wild Lilac 1.5 M 6' to 8'Full sun Yes
Cotoneaster
Dammeri Bearberry Cotoneaster < 2 M 5 to 6 ' Yes
Euonymus
Fortunei
Coloratus Purple Leaf Winter Creeper 1.5 M 6' to 8'
Full sun to
light shade Yes
Juniperus
Horizontalis
Blue Chip Juniper/Hughes
Juniper 1 M 6' to 8'Full sun No
Microbiota
Decussata Siberian Carpet Cypress 1.5 M 7' to 8'
Full sun to
light shade No
Rubus
Calycinoides Evergreen Bramble 1 M 6'Full sun Yes
Vinca Minor Periwinkle 0.5 M 1.5'
Full sun to
partial
shade Yes
Issued January 2022 City of Auburn
Engineering Design Standards Page 145
Table 10-7B Ground Cover (Continued)
Botanical
Name Common Name
Mature
Height (ft.)
Can be
utilized in:
M (Medians),
L (Landscape
Strips)
Minimum
Planting
Area Width
(ft.)
Sun/
Moisture
Obvious
Flowers
Aucuba Mr. Goldstrike 8 M 7
Part to Full
Sun,
Moderate
Moister Yes
Thymus
Serpyllum Mother of Thyme 0.25 M 1
Full Sun,
Drought
Tolerant Yes
Prunus
Lavrocerasus Otto Lyuken 3 M 6
Full to Part
Shade,
Needs
well
drained
soil No
Berberus
Thungerii Japanese Barberry 4 M 5
Full Sun,
Low Water N
Phorium Wings of Gold 3 – 4 M 3
Sun or
Shade N
10.09.04 Planting Methods and Maintenance
Good horticultural practice shall be employed in the preparation of the soil and planting pits. This
will include:
1. Conserving topsoil and replacing it on the site.
2. Performing soil tests.
3. Providing corrective soil preparation as necessary.
4. Ensuring landscaping has adequate bedding and base material (minimum 8 inch deep
amended soils over minimum 4 inch layer of scarified/tilled base soils all free of rocks,
construction debris, slurry, and other construction material)
10.09.05 Establishment Period
The applicant shall be responsible for maintaining the trees and plants in the public landscape strip,
medians and entry features in a healthy condition for 1 year after acceptance of the project. For
landscape strips that do not include irrigation, maintenance will include providing water during dry
periods. Weeds, diseases, and insect pests must also be controlled.
10.09.06 Irrigation Systems
Irrigation systems in the public right of way shall conform to Auburn City Code 12.12.236 and shall
adhere to the standards specified in the City of Auburn Construction Standards.
Issued January 2022 City of Auburn
Engineering Design Standards Page 146
10.10 Mailboxes
See City of Auburn Standard Details T-07, T-08 & T-09.
Locating and installing mailboxes in connection with the construction or reconstruction of a City street
shall follow AASHTO and Post Office guidelines.
10.10.01 Mailbox Locations
Mailboxes shall be located a minimum of 2 feet back from the face of curb on streets which have a
curb. For streets without a curb, setbacks shall be determined using ASSHTO standards. When
locating mailboxes, access, sight distance, and landscaping requirements shall be taken into
account. Final locations shall be detailed on the civil plans and approved by the serving Post Office
and the City.
When mailboxes are located in the sidewalk, individually or in clusters, sidewalks shall be widened
to provide a minimum 5 feet of clearance around the mailboxes. Widening of the sidewalk may
require the dedication of additional right-of way.
10.10.02 Mailbox Installation
The owners or residents served by mailboxes will install and thereafter maintain their own individual,
clustered, or separated mailboxes as instructed by the U.S. Postal Service.
10.11 Illumination
10.11.01 General
Roadway lighting is required along all City owned streets except classified Rustic Collectors and
Rustic Residential Collectors where only the intersections require lighting. Street lighting design
shall be in conformance with the design criteria in the most recent edition of the IES Lighting
Handbook (Illuminating Engineering Society of North America) and applicable WSDOT and City of
Auburn Design and Construction Standards.
10.11.02 Design
All City street light luminaires shall be LED per City of Auburn Standard Detail T-37.
Table 10-8 has been included as a general guideline for determining illumination sizing and location
requirements. Street light standards shall be staggered from one side of the roadway to the other,
except where site constraints make single sided lighting more feasible and equally effective. The
Applicant shall provide project specific lighting calculations that demonstrate minimum illumination
levels will be met. Light level calculations shall be done ignoring any existing substandard luminaires
(PSE lights on wood poles, etc.).
Special consideration shall be given for light levels at crosswalks, curves, conflict points and street
ends. Roadway lighting levels also are impacted by the type of pavement surfacing and special
consideration shall be given for surfaces like concrete roadways. The locations of street lights shall
take into consideration any obstacles which may screen or impede lighting levels such as street
trees and awnings. Minimum separation between street trees and street lights shall be 20 feet or ½
the mature tree canopy width, whichever is greater.
Marked crosswalks at traffic signal controlled intersections and sidewalks in the Downtown Urban
Corridor (DUC) zone shall be lit to an average of 2-foot candles. All other marked crosswalks will
be lit to a minimum of 1-½ times the required average light level per table 10.8.
Issued January 2022 City of Auburn
Engineering Design Standards Page 147
10.11.03 Lighting Design Schedule
Table 10-8 provides minimum lighting design criteria, lamp attachment types, heights, davit arm
lengths, and typical spacing for various roadway classifications in the City. The schedule is based
on typical straight roadway sections with a staggered lighting configuration. Wider road sections,
curves, intersections, cul-de-sacs, single sided lighting configurations require additional analysis to
determine the spacing, height, and davit arm lengths required to achieve the required lighting levels.
10.11.04 Luminaries
See City of Auburn Standard Detail T-37 for LED lamp attachment part schedule.
Luminaires shall meet the general requirements City of Auburn Engineering Construction Standards.
Street and Pedestrian Luminaires shall operate on 240 Volt AC and all luminaires shall be full cutoff.
All luminaires shall be provided with wattage labels for positive identification of Lamp (See Table
10-8). A maximum of 5% voltage drop across each circuit will be permitted.
Table 10-8 Lighting Design Criteria
Street
Classification
Lamp Attachment
Type (See City of
Auburn Standard
Detail T-37)
Avg.
Light
Level
(ft-candle)
Max.
Uniformity
Ratio
Min. Light
Level
(ft-candle)
Luminaire
Mounting
Height
(ft)
Spacing*
(ft)
Davit
Arm
Length
(ft)
Principal Arterial Type A 1.4 3 To 1 0.2 35** 190 12
Minor Arterial Type B 0.9 3 To 1 0.2 35 190 12
Minor Arterial
w/Center Turn
Lane or Median
Type B
0.9 3 To 1 0.2 35 190 12
Non-Residential
Collector
Type B 0.9 3 To 1 0.2 35 200 12
Residential
Collector
Type D
0.6 3 To 1 0.2 30 175 14
Residential
Collector w/Center
Turn Lane or
Median
Type D
0.6 3 To 1 0.2 30 175 14
Local Non-
Residential
Type D 0.6 3 To 1 0.2 35 160 12
Rustic Roads** N/A N/A N/A N/A N/A N/A
Local Residential
and Local
Residential
Alternate
Type F
0.4 6 To 1 0.1 30 185 8
* Standard spacing is for staggered arrangement on flat, straight, roadway with the City standard
cross section. Spacing where these conditions do not apply shall be determined using analytical
methods in accordance with the most recent edition of the IES Lighting Handbook (Illuminating
Engineering Society of North America). All design inputs besides spacing shall be held to the
specifications listed in Table 10-8.
** Lighting for rustic roads shall be at intersections only.
Issued January 2022 City of Auburn
Engineering Design Standards Page 148
10.11.05 Light Standards
City street light poles shall be “cobra head” style per City of Auburn Standard Detail T-19 except
for streets within the DUC zone that shall be per City of Auburn Standard Detail T-28 or T-39. An
alternate street light may be utilized along local residential streets per City of Auburn Standard
Detail T-29.
Street light poles with double davit arms may be allowed in medians as long as lateral offset/clear
zone and other applicable design criteria and maintenance accessibility are met.
Light Standards handholes shall be four inches by six inches nominal non-flush type in accordance
with City of Auburn Standard Detail T-19 with tamper resistant screws.
10.11.06 Light Standards Foundations
All light poles shall be placed on a foundation. Foundations for light standards shall conform to City
of Auburn Standard Details T-19, T-28, or T-29.
Luminaire wiring, conduit, and pole placement within street cross sections that have curb, gutter,
and sidewalks shall be per City of Auburn Standard Detail T-18.
10.11.07 Service Cabinet, Foundation, Conduit
See City of Auburn Standard Detail T-21.
All new luminaires shall be connected on an electrical circuit that is connected to a power source
through a service cabinet. The service cabinet shall be within 50 feet of the Puget Sound Energy
(PSE) point of service connection.
Service cabinets shall be installed behind the sidewalk and at locations that do not impede
maintenance access. The cabinet shall be located in the center of the system so there are a near
equal number of lights being served on separate circuits from each side of the cabinet. The cabinet
shall be labeled with “COA Lighting” and service site address.
The number of luminaires per service will be based upon the type of luminaire and the capacity of
the service. Testing may be required to determine if additional luminaires may be added to an
existing service.
Service cabinets shall be in conformance with the City of Auburn Engineering Construction
Standards All new luminaires shall have a 7 pin PCR7 receptacle and come with a Sensus
VantagePoint wireless control node.
Street light conduit shall be per the City of Auburn Construction Standards.
10.11.08 Junction Boxes
See City of Auburn Standard Detail T-20.
A. Street Junction boxes shall conform to City of Auburn Standard Detail T-20. Junction
boxes shall be of the type specified on the plans and shall conform to the requirements
of WSDOT Standard Plan J-40.10. All junction boxes shall be locking.
B. Type 1 junction boxes shall be located adjacent to the sidewalk within the landscaping
strip, if provided, or adjacent to the back of sidewalk if a landscape strip does not exist,
or within the shoulder of a non-curbed roadway. Junction boxes remaining or placed
within the sidewalk or walking paths shall be non-skid.
Issued January 2022 City of Auburn
Engineering Design Standards Page 149
10.12 Survey Monuments
See City of Auburn Standard Detail T-46
Survey monuments shall be placed or replaced in accordance with WAC 332-120 (Survey Monuments
– Removal or Destruction), and RCW 58-09.120 and good practice in land surveying. Monuments are
required along the centerline of improvement of all new or reconstructed streets. Monuments shall be
placed at intersections, P.C. (points of curvature), and P.T. (points of tangency).
Unless approved otherwise by the City, ground disturbing activities within 25 feet of an existing survey
monument requires securing of a permit from the Department of Natural Resources in advance of those
activities. All existing survey monuments that are disturbed, lost, or destroyed during construction shall
be replaced by a registered land surveyor registered in the State of Washington at the expense of the
responsible builder or applicant. Any monument set shall be permanently marked with the certificate
number of the Professional Land Surveyor setting it (which shall be the same Professional Land
Surveyor that prepares and certifies the associated monument recording information).
10.13 Guardrail
Evaluation of embankments for guardrail installations shall be in accordance with the WSDOT Design
Manual.
Guardrail installations shall conform to WSDOT Standard Plan C-1, Beam Guardrail Type 1. End
anchors shall conform to WSDOT Standard Plan C-6, Beam Guardrail Anchor Type 1.
10.14 Bollards
See City of Auburn Standard Detail T-03.
When necessary to deny vehicle access to an easement, tract, or trail (except for maintenance or
emergency vehicles) the point of access shall be closed by a line of bollards. These shall include one
or more fixed bollards on each side of the traveled way and removable, locking bollards across the
traveled way. Spacing shall provide one bollard on centerline of the trail and other bollards at a
maximum spacing of 3 feet to preclude vehicular access. Bollard design shall be in conformance with
City of Auburn Standard Detail T-03. Fire access roads shall not be blocked in this manner. Fire
access roads will be blocked with a gate and knox lock.. Bollards are considered fixed roadside objects
and shall meet separation requirements described in Section 10.17.
10.15 Bus Transit Facilities
This section provides the minimum design standards to be used in the design of bus transit facilities in
the City of Auburn. Bus facilities shall be designed, located and installed in cooperation with appropriate
operating transit agency.
When determined appropriate by the City Engineer, or requested by a transit service agency, an
applicant for new or expanded development is required to consult with King County METRO, Pierce
Transit, and/or the Muckleshoot Indian Tribal Transit to determine the practicality of how the site can
be served by transit oriented improvements such as bus pullout lanes, bus stops, or other
appurtenances.
Bus stops are located, designed and installed as part of a cooperative effort between the City and the
operating transit agency. Bus stops are managed as part of a right of way use permit granted by the
City to the operating transit agency. In general bus stop location and design decisions should follow
the facility design guidelines of the operating transit agency. The King County Metro Transit Planning
Office or Pierce County Transit should be contacted for specific design questions.
Issued January 2022 City of Auburn
Engineering Design Standards Page 150
10.15.01 Bus Stops Locations
In general bus stop location and design decisions should follow the facility design guidelines of the
operating transit agency. The following are guidelines that indicate where bus stops are appropriate:
A. Projected or existing passenger boarding and debarking demand warrant a stop.
B. Traffic characteristics and street design make the location safe to stop a transit vehicle.
C. The location meets the facility guidelines and fleet specifications of the operating transit
agency.
D. The stop is required to be accessible to the physically challenged (Americans with
Disabilities Act).
10.15.02 Bus Stops Features
In general bus stop location and design decisions should follow the facility design guidelines of the
operating transit agency. The following are some guidelines that would indicate what type of
treatment would be appropriate by type of bus stop.
A. Shelters should be installed at bus stops with an existing or estimated 25 or more boarding
per day.
B. Benches should be installed at bus stops with an existing or estimated 15 or more boarding
per day.
C. Trash receptacles should be installed and maintained by the operating transit agency at all
bus shelters. A sign should be placed indicating that the shelter stop is maintained by the
operating transit agency and giving specific contact information to report problems with the
stop including a phone number.
D. At all bus stops experiencing 15 or more boarding per day trash receptacles may be placed
by the City or adopt a spot group and should be maintained by the City or the adopt a stop
group.
E. Information schedules and schedule holders shall be placed at all inbound stops (stops
where buses are headed toward a major Central Business District), at all transfer points and
at heavily used outbound stops.
F. Additional bus stop lighting should be provided at locations where lighting levels are
determined to be less than 3 foot candles.
G. The stop should be accessible to the physically challenged (meeting the requirements of the
Americans with Disabilities Act).
H. Bus pullout lanes may be required where bus queuing or staging is required by the transit
agencies operations and at the discretion of the City Engineer. The following are guidelines
that would indicate pullouts would be appropriate:
i. Traffic and passenger boarding and debarking conditions warrant.
ii. Traffic flow would be greatly hindered due to in lane stopping.
iii. The posted speed limit is in excess of 30 mph.
10.15.03 Bus Pullout Lanes
Bus pullout locations shall meet the following requirements:
Issued January 2022 City of Auburn
Engineering Design Standards Page 151
A. Placement of bus pullouts shall be on the far side of signalized intersections and non-
signalized intersections immediately following the intersection. Distance between pullouts
should not be less than 1,000 feet.
B. If far side pullouts are not possible, nearside pullouts will be evaluated. Mid-block pullouts
are discouraged. If a situation arises where a mid-block bus pullout is the only option,
pullouts should be constructed on both sides of a two-way street in a complementary pair.
C. Maintaining adequate separation between access points, intersections, and bus pullouts can
increase the safety and efficiency of both the roadway and the transit service.
D. When locating a bus pullout consideration shall be given to existing access points and where
passengers have safe and direct access to sidewalks, crosswalks, ramps, or other
pedestrian facilities. Consideration shall also be given to trip attractors, and activity centers.
E. Bus pullouts must meet sight distance requirements.
F. Shall be designed in accordance with the applicable operating transit agency’s guidelines.
G. Designs must follow applicable guidelines of the Americans with Disabilities Act.
10.16 Traffic Control Devices
Traffic Control devices are all signs, signals, markings and other devices used to regulate, warn, or
guide traffic. All traffic control devices shall meet the requirements of FHWA’s latest adopted version of
the Manual on Uniform Traffic Control Devices (MUTCD) and the standards herein.
10.16.01 Median Islands
Median Islands are raised barriers constructed between opposing lanes of travel. Median Islands
are generally restricted to classified roadways and may be required in order to:
1. Control access along a corridor, or
2. Provide a traffic calming element.
Median Islands shall be designed using the same geometric criteria as the street on which they
will be constructed. Medians shall also meet the following requirements:
A.Median Ends:Median ends shall be flared at intersections and at breaks to allow for
transitioning traffic, ease of street sweeping and shall include signage in accordance with
MUTCD requirements.
B.Width:Median islands shall be a minimum face of curb to face of curb width of 9 feet
when landscaped and a minimum of 4 feet in width when paved.
C.Shy Distance: 1 foot minimum shy distance shall be maintained from face of median
curbs to edge of travel lanes.
D.Landscaping/Paving:Landscaping in medians shall conform to the requirements of
Section 10.09. Median paving shall be stamped concrete with colors and patterns
approved by the City.
E.Irrigation:Landscaped medians shall include irrigation systems.
F.Illumination:Street lights on streets with median islands 8 feet in width and greater shall
be located in the medians using dual arm posts and shall meet the minimum light level
requirements of Section 10.10.
Issued January 2022 City of Auburn
Engineering Design Standards Page 152
G.Maintenance Access:Median islands 8 feet in width and greater shall provide a paved
maintenance staging area 50 feet in length with mountable curbs. Median islands smaller
than 8 feet in width shall include one 50 foot break in the median per block. All landscaped
medians shall provide a 1 foot wide, 6-inch thick, concrete maintenance apron around the
perimeter of the median behind the curb. Islands with street lights or vegetation will be
designed to allow maintenance of the lights or vegetation without requiring full closure of a
travel direction(s).
10.16.02 Mountable Curbs
Mountable (also referred to as “C” Curbs), are curbs used for the restriction of turning movements
and to aid in the channelizing of traffic. Mountable curbs may be required in order to control access
along a corridor within the restricted zones of any functional intersection boundary as defined in
Section 10.04.
Mountable Curbs constructed to retrofit existing roadways shall be constructed per City of Auburn
Standard Detail T-32. Mountable Curbs constructed on new roadway surfaces shall be cast-in-
place curb per City of Auburn Standard Detail T-47. All Mountable Curb shall be painted to match
the adjacent roadway striping (yellow or white) and shall be marked with raised pavement markers
and flexible tubular delineators at the beginning and end sections as shown on City of Auburn
Standard Detail T-32. Mountable curbs shall be designed to account for roadway drainage.
10.16.03 “Pork Chop” Islands
“Pork Chop” Islands are barrier islands used to restrict turning movements at driveways. They may
be required at any driveway where left turns are restricted and Median Islands or Traffic “C” Curb
installation is not feasible. When required, Pork Chops shall be accompanied by appropriate turn
restriction signing and pavement markings.
10.16.04 Signage
All signing shall be per the “Manual on Uniform Traffic Control Devices” (MUTCD) and City of Auburn
Engineering Construction Standards.
Developments shall be responsible for providing and installing all traffic control signs, including but
not limited to street name signs, regulatory signs, warning signs, barricades, and bicycle/pedestrian
signs as required.
Sign posts shall be installed per City of Auburn Standard Detail T-24.
Mast arm mounted street name signs shall be per City of Auburn Standard Detail T-25.
Post mounted street name signs shall be per City of Auburn Standard Detail T-26.
Post mounted “No Parking This Side” signs spaced at a maximum of 100 feet and shall be per City
of Auburn Standard Detail T-40.
10.16.05 Crosswalks
Per RCW 46.04.160, crosswalks exist at all roadway intersections, whether marked or un-marked,
and regardless of whether there are sidewalks at the intersection. Crosswalks also exist at non-
intersection locations where they have been established with crosswalk markings (such as a
midblock crossing). For the purposes of these standards, intersections are as defined in Chapter 1
of these standards.
Issued January 2022 City of Auburn
Engineering Design Standards Page 153
Except within the Downtown Urban Center, crosswalk markings will be per WSDOT Standard Plan
M-15.10. In the Downtown Urban Center on non-principal arterial streets, crosswalks will conform to
City of Auburn Standard Detail T-43.
Crosswalks will be marked at the following intersection locations, except where pedestrian facilities
are NOT present:
a. Traffic signal controlled intersections as shown in the figure below:
b. Yield controlled approaches to roundabouts.
c. Stop controlled approaches at intersections within the Downtown Urban Center.
d. Stop controlled approaches to Arterial Streets (Principal or Minor Arterials).
e. Stop controlled approaches at the intersection of two or more arterial and/or collector
Streets.
f. Stop controlled approaches of Local Streets to Non-Residential Collector Streets.
Marked crosswalks at non-intersection locations, and intersection locations not listed above, require
enhancement(s) that reduce traffic speeds, shorten crossing distance, increase driver awareness of
the crossing and/or provide active warning of pedestrian presence. Selection of appropriate
Issued January 2022 City of Auburn
Engineering Design Standards Page 154
enhancements requires analysis and documentation by an engineer. Enhancements may include,
but are not limited to, signage, rapid rectangular flashing beacon(s), and/or bulb-outs.
Permanently closed crosswalks across arterial and collector streets shall have signage indicating
that pedestrian crossing is prohibited (No Pedestrian Crossing Sign, MUTCD R9-3). A
supplementary plaque with arrow (Use Crosswalk Plaque w/Arrow MUTCD R9-3bP) will be
included with the no pedestrian crossing sign where the closed crosswalk is at an intersection where
one crosswalk is closed and the adjacent crosswalk is open and at locations where an open
crosswalk exists only in one direction from the closed crosswalk.
Downtown Pedestrian Crosswalks
Marked crosswalks shall be per City of Auburn Standard Detail T-43.
An existing marked crosswalk that does not meet the requirements of the Guidelines shall be re-
built in its entirety to meet the requirements of the Guidelines with the any of the following
construction activities:
On an arterial street, full depth pavement re-construction across half or more of the
crosswalk width.
On a non-arterial street, surface pavement restoration across half or more of the crosswalk
width.
The crosswalk width is measured from face of curb or pavement edge at the pedestrian pathway
entry into the vehicle travel way to curb face or pavement edge at the pedestrian pathway departure
from the vehicle travel way. This distance is measured through medians, islands, and other
pedestrian refuge areas.
10.16.06 Left and Right Turn Lane Channelization
Left-turn Lane Channelization
See WSDOT Standard Plans M-3.20 & M-3.40.
Left-turn lane channelization shall include a minimum of 150 feet of full-width lane. The standard
width of a left-turn lane will be 11 feet. Left-turn arrows per WSDOT Standard Plan M-24.40
shall be installed 25 feet behind the stop bar. Additional storage may be required for long
vehicles, anticipated left-turn queues longer than the minimum storage, or to ensure that a left-
turn lane is not blocked by an adjacent through queue. If storage length exceeds one hundred
150 feet, auxiliary turn arrows will be installed at 100 foot intervals. Deviation requests from the
minimum left-turn lane storage requirements will need a traffic study submittal and approval by
the City Engineer.
Left-turn Lane at End of Two-way Left-turn Lane
See WSDOT Standard Plan M-3.40.
Left-turn lane at the end of two-way left-turn lanes shall conform to WSDOT Standard Plan M-
3.40.
Dual Left Turn
See WSDOT Standard Plan M-3.50.
Issued January 2022 City of Auburn
Engineering Design Standards Page 155
Right-turn Lane Channelization
See WSDOT Standard Plan M-5.10
Right-turn lane pocket channelization shall include a minimum of 150 feet of full-width lane. The
standard width of a right-turn lane will be 11 feet. Additional storage may be required for long
vehicles, to accommodate anticipated right-turn queues longer than the minimum storage, or to
ensure that a right-turn lane is not blocked by a through queue. Deviation requests from the
minimum right-turn lane storage requirements will need a traffic study submittal and approval by
the City Engineer. Right-turn arrows per WSDOT Standard Plan M-5.10.
“ONLY” lettering per WSDOT 80.10 is required where a through lane converts to a turn lane and
other circumstances as determined by the City Engineer.
10.16.07 Lane Division
See WSDOT Standard Plan M-20.10 and City of Auburn Standard Detail T-12.
All pavement markings used to separate or channelize traffic shall conform to the referenced
Standard Plans and to the City of Auburn Construction Standards.
Lane division pavement markings on Local Residential streets are not required, except as may
be deemed necessary by the City Engineer.
10.16.08 Painted Islands
Painted islands will be allowed on a case-by-case basis with approval from the City Engineer.
Pavement markings for painted islands shall meet the MUTCD requirements.
10.16.09 Two-way Left-turn Lanes
See WSDOT Standard Plans M-3.20 & M-3.40
The installation of two-way left-turn lanes on City streets will be determined by the City based
on street classifications and left turn requirements. The minimum width of a two-way left-turn
lane shall be 11 feet. The delineation lines shall be SBY (Single Broken Yellow) and a SSY
(Single Solid Yellow) along the opposing lanes per the MUTCD. Two-way traffic arrows shall be
spaced every 250 feet along this lane with a minimum of one per block. The designer should
pay special attention to the beginning and endings of this type of lane and use clearly defined
tapers or islands to maintain traffic safety.
10.16.10 Other Pavement Markings
Railroad crossing marking shall be per the standard symbol shown on WSDOT Standard Plan
M-11.10.
10.16.11 Construction Area Temporary Traffic Control
The contractor shall be responsible to provide and maintain all signs, barriers, warning lights,
striping, and flag control required for maintaining public safety in construction areas. Traffic
control shall be maintained at all times when construction is in progress on all streets, and access
points in the construction area.
Construction activities will not be allowed in the public right of way without an approved traffic
control plan. Contractor to refer to the Construction Standards for further details.
Issued January 2022 City of Auburn
Engineering Design Standards Page 156
10.16.12 Roadway Barricades
Temporary and permanent barricades shall conform to the standards described in
Section 6C-8 of the Manual on Uniform Traffic Control Devices (MUTCD).
A. Type I or Type II barricades may be used when traffic is maintained through an area being
constructed/reconstructed.
B. Type III barricades may be used when streets are closed to traffic. Type III barricades may
extend completely across the street (as a fence). Where provision must be made for access
of equipment and authorized vehicles, the Type III barricades may be provided with movable
sections that can be closed when work is not in progress, or with indirect openings that will
discourage public entry. Where job site access is provided through the Type III barricades,
the developer or contractor shall assure proper closure at the end of each working day.
C. Type III barricades shall be used at the end of a local access street terminating abruptly
without cul-de-sac bulb or on temporarily stubbed off streets. Each such barricade shall be
used together with an end-of-road marker. See City of Auburn Standard Detail T-45.
10.16.13 Traffic Signals
Traffic signals shall be designed and constructed in accordance with Sections 8-20, 9-29, and
other applicable sections of the Construction Standards. Traffic signal facilities shall utilize video
vehicular detection. Induction loops are only allowed where the City Engineer has determined
that vehicle detection cameras are not feasible. Wherever existing induction loops are damaged
and require replacement , the City Engineer may require replacement of the loop(s) with a video
detection system. WSDOT Standard Plans shall be utilized except the following elements that
shall be per City of Auburn Standard Details:
Traffic Signal in the DUC Zone: City of Auburn Standard Detail T-38
Traffic Signal Controller and Foundation: City of Auburn Standard Detail T-22
Telecommunication and Luminaire Electrical Trench: City of Auburn Standard Detail T-23
The following definitions are referenced when determining what upgrades to pedestrian push-
button and pedestrian signal head systems are triggered by development/construction activity:
Functionally Accessible: For pedestrian pushbuttons and pedestrian signal heads to be
considered accessible from a functionality standpoint, they must be of the brands, makes,
and models that are specified by the current Engineering Construction Standards.
Location Accessible: For pedestrian pushbuttons to be considered accessible from a location
standpoint, they must be between 42 and 46 inches in height measured vertically from the
centerline of the pushbutton and the adjacent level landing and the pushbutton must be 10
inches or less measured horizontally from the adjacent level landing.
In accordance with the City’s adopted ADA Transition Plan, modification or expansion of any
portion of the electrical systems of a signalized intersection or enhanced crossing requires
making all pedestrian pushbuttons and pedestrian signal heads at the intersection or crossing
Functionally Accessible. Construction, modification, removal or replacement of any portion of
any curb ramp at a signalized intersection or enhanced crossing requires making the pedestrian
pushbutton serving the new, modified, or replaced ramp Location Accessible and making all of
the pedestrian pushbuttons and pedestrian signal heads at the intersection or crossing
Functionally Accessible.
Issued January 2022 City of Auburn
Engineering Design Standards Page 157
10.16.14 Traffic Calming
Traffic calming features may be required on existing or new streets where street layouts,
geometry, or other context create potential for cut-through and/or speeding traffic. Potential traffic
calming features include varying roadway sections, traffic circles, chicanes, medians, bulb-outs,
raised intersections, and raised crosswalks. Speed cushions are not an acceptable traffic
calming approach except when considered and installed as either: 1) Part of the City’s
Neighborhood Traffic Calming Program, or 2) With approval from the City Engineer, as mitigation
on existing roadways where development activity creates the potential for cut-through and/or
speeding traffic and the City Engineer determines that other traffic calming approaches would
not be applicable or appropriate.
Where speed cushions are installed, they will be per City of Auburn Standard Details:
Speed Cushion Detail: City of Auburn Standard Detail T-42
10.17 Traffic Impact Analysis
Traffic Impact Analyses’ are used to identify capacity and safety concerns, to assist in the evaluation
of site design as it relates to traffic engineering issues, and to identify appropriate solutions and
mitigation.
To adequately assess a development’s traffic impact, the City Engineer may require a Traffic Impact
Analysis. The requirement for a Traffic Impact Analysis will be based on the size of the development
proposed, existing street and intersection conditions, traffic volumes, accident history, safety
considerations, community concerns, and other pertinent factors relating to traffic impacts attributable
to the development.
10.17.01 When Traffic Impact Analyses are Required
A traffic impact analysis is required for development activities that create one or more of the following
conditions:
The development could potentially affect an intersection or corridor where an existing level
of service is at or below standard.
The development generates more than 30 PM or AM peak hour trips on a corridor or
intersection.
The development may potentially affect the implementation of the street system as outlined
in the Comprehensive Transportation Plan and Six Year Transportation Improvement
Program (TIP), or of any other documented transportation project.
The development proposes a rezone of the subject property.
The original Traffic Impact Analysis for a future development is outdated due to changes in
traffic volumes in the vicinity of the proposed project or approved pipeline projects or a
change in the proposed land use’s trip generation and/or distribution.
The development could potentially affect safety or requires an analysis to assist in designing
appropriate access.
10.17.02 Elements of a Traffic Impact Analysis
Each development traffic review is different and, as such, each traffic study should be cooperatively
designed to address the city’s specific concerns. Traffic impact analyses are therefore required to
Issued January 2022 City of Auburn
Engineering Design Standards Page 158
be scoped by and with the City Engineer or designee. They may include all or some of the following
elements:
Corridor level of service analyses,
Intersection level of service analyses,
Access point level of service analyses,
Queue Analysis,
Critical gap analyses,
Horizontal and vertical sight distance analyses,
Roundabout analyses,
Traffic signal warrant analyses,
Stop control warrant analyses,
Turn lane warrant analyses,
Access management design,
Other analyses and information as required by the City Engineer.
10.17.03 Special Uses
Special event land uses which do not exhibit typical trip generation characteristics may require
unique analysis, including but not limited to weekend and off-peak scenarios, and AM versus PM
time frames. Examples of such uses would be concert stadiums, racetracks or uses which exhibit
substantial traffic peaking associated with special events that are scheduled on a periodic basis.
The traffic analysis for such uses may include a traffic management plan to control traffic impacts
associated with the special events.
10.17.04 Mitigation Identification
In order to protect the public from potentially adverse impacts of the proposal, to fulfill an identified
need for public services within the impacted area related to the development, or both, the Traffic
Impact Analysis shall identify methods of mitigating on-site and off-site deficiencies for present and
proposed phases of the development. The analysis shall make recommendations for improvements
necessary for safe and efficient traffic flow and bicycle, pedestrian, and transit movement and access
proportional to the identified impacts. Build-out Year, Long-Range Forecast Year, and project
phasing impacts shall be considered. All or some of the following items are to be included in the
mitigation identification:
Methods for mitigating on-site impacts and mitigation recommendations,
Methods for mitigating off-site impacts and mitigation recommendations,
Discussion of whether on-site and off-site improvements are justified, reasonably related
to, and proportional to the impacts of the proposed development,
Any requirements or mitigation measures associated with the Area Circulation Plan.
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Engineering Design Standards Page 159
10.17.05 Recommendations
The Traffic Impact Analysis report shall clearly state the mitigation measures recommended by the
analysis and shall summarize how the recommended mitigations are proportional to the identified
impacts. The recommended street and highway mitigation measures shall be explained in sufficient
detail in the analysis to allow them to be understood and evaluated. The recommendation shall also
include the following:
Clear statements of the applicant’s recommended mitigation measures.
Scaled drawings depicting recommended mitigation improvements and their relationship
to existing and proposed conditions if drawings are needed.
10.17.06 Area Circulation Plan
Area Circulation Plans are plans which support the development of a multi-modal transportation
network with safe, efficient and pleasant routes for pedestrians, bicyclists, transit users, and motor
vehicle occupants. The plan recognizes the link between land use and transportation planning and
promotes land use and development patterns that encourage walking, bicycling, and transit use.
The goal of an Area Circulation Plan is to "provide a transportation system that will facilitate the safe
and efficient movement of people and goods throughout the community while supporting the
designated Land Uses in the Comprehensive Plan.” This goal applies to all aspects of circulation
including: vehicular, mass transit, bicycle, and pedestrian. In order for the City of Auburn to
successfully meet the vision set forth in the Comprehensive Plan, the Area Circulation Plan will need
to address a variety of transportation modes to facilitate the convenient and efficient movement of
people in and near new development.
Area Circulation Plans are required for all new development of general commercial and industrial
property. They also may be required for land uses which do not exhibit typical trip generation
characteristics that require unique analysis, including but not limited to weekend and off-peak
scenarios, and AM versus PM time frames.
The Area Circulation Plan shall include sufficient information to adequately assess the functionality
of the proposed development and its impact on surrounding properties and circulation systems,
including but not limited to:
Mapping details, such as site boundaries and dimensions, site acreage, vicinity map,
north arrow, scale, title block, etc.;
Access to the site and interior site circulation;
Proposed lot layout;
Other items which may impact adjacent property, such as general parking arrangement,
delivery truck/dock locations, medians or traffic control devices, median breaks, and other
information as deemed necessary by the City Engineer and Planning Director.
Any development or subdivision of the property shall generally be consistent with the Area
Circulation Plan as approved or amended. No plat, building permit, or certificate of occupancy shall
be issued for the property unless all construction and development generally conforms to the Area
Circulation Plan.
10.18 Clear Zone – Lateral Separation
The following standards apply to all new or replaced facilities and do not obligate the City to retrofit or
replace existing facilities for the sole purpose of meeting the standards below.
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Engineering Design Standards Page 160
The City has adopted 4 feet as the minimum lateral separation from the edge of motorized vehicular
travel way to fixed objects for streets with vertical curbs within the urban environment. Utility and traffic
signal poles along streets with vertical curbs within the urban environment, as defined in Chapter 10 of
the AASHTO Roadside Design Guide require minimum 6 feet lateral separation from edge of motorized
vehicular travel way. Under many conditions, additional lateral separation shall be required to provide
adequate clear zone per the AASHTO Roadside Design Guide. These conditions include, but are not
limited to: streets without vertical curbs, horizontal curves, proximity to driveways, high design speeds
(in excess of 45 mph), merge locations, crash history, roadways that are not built per existing City
standards, and other conditions as deemed applicable by the City Engineer. Reduced minimum lateral
separation along roadways with design speeds of 35 mph or less is allowed for street trees centered
within landscape strips and for mailboxes. Minimum lateral separation from the face of curb to any
roadside object (regardless if fixed or non-fixed) is 2 feet.
Issued January 2022 City of Auburn
Engineering Design Standards Page 161
Table 10-1 Summary Matrix of Minimum Street Geometry Design Requirements
ROADWAY CLASSIFICATION/CATEGORY
DESIGN CRITERIA PRINCIPAL
ARTERIAL
MINOR
ARTERIAL
RESIDENTIAL
COLLECTOR
NON-RESIDENTIAL
COLLECTOR
RUSTIC
COLLECTOR
LOCAL
RESIDENTIAL
LOCAL
NON-RESIDENTIAL
RUSTIC
RESIDENTIAL
Average Daily Traffic (ADT)Over 15,000 10,000 – 15,000 2,500 – 10,000 2,500 – 5,000 1,000 – 5,000 Up to 1,200 Up to 1,200 Up to 1,000
Posted Speed (mph) 2 45 40 35 35 30 30 30 40 35 30 25 30 25
Roadway Cross Section and Additional Criteria,
See Listed Figure Figure 10-01 Figure 10-02 Figure 10-03 Figure 10-04 Figure 10-05 Figure 10-06 Figure 10-07 Figure 10-08
Intersection Curb Radii Min (ft.)1 406 356 256 306 30 20 306 20
Intersection ROW Radii- Min. (ft.)29.5 24.5 14.5 19.5 17 9 19.5 7
Min/Max Horizontal Approach Angle 90° ± 5°90° ± 5°90° ± 5°90° ± 5°90° ± 5°90° ± 5°90° ± 5°90° ± 5°
Minimum Landing Approach Length (ft.)30 30 20 20 20 20 20 20
Maximum Landing Approach Grade (%)3 3 5 5 5 5 5 5
Min. Horizontal Curve Radius (ft.)2, 5
(For Standard Cross Section)9720 8150 4930 1121 821 544 544 1125 821 544 333 510 333
Min. Tangent Between Reverse Curves (ft.) 2 150 150 150 150 150 100 150 100
Maximum Rate of Superelevation, e (%)8 8 0 0 8 0 0 0
Max. Vertical Grade (%) 3,4, 7 6 6 8 8 8 8 8 8
Min. Vertical Grade (%)0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Cross Slope (%)3 3 3 3 3 2 2 2
1 At intersections with two different street classifications, use the highest classification for curb radii except at intersections with residential streets where the lowest order street shall be used.
2 Table values are for standard cross sections with a relatively level grade and are for reference only. For accurate design values reference the AASHTO Manual “A Policy on Geometric Design of Highways & Streets.”
3 Vertical curves will be required when the algebraic grade difference is more than 1%.
4 See Section 10.02 deviation constraints and requirements.
5 Minimum radii are for streets designed using the recommended cross slopes listed above. Minimum street radii for Arterials and Rustic Collectors may be reduced by superelevating the street section per the requirements above. Horizontal curve radius for local
Residential roads may be reduced to 100 feet with approval of the City Engineer where speeds of 20mph or less are justified or approaching cul-de-sac’s.
6 Intersection Curb Radii reduction may be permitted by City Engineer with approved documentation of design vehicle turning accommodation without impacting opposing traffic lanes.
7 For local residential streets, vertical grades may be increased to 10% without deviation when all other geometric design criteria are met.
Issued January 2022 City of Auburn
Engineering Design Standards Page 162
11 City Telecommunication Facilities
11.00 Preface
The design of City Telecommunications facilities located within City right-of-way shall be in
conformance with these standards.
Compliance with these standards does not alleviate the design engineer from using sound
professional engineering practices. The design criteria contained herein are the minimum
acceptable under standard conditions. Special conditions may require more stringent
requirements that will be addressed during the plan review process.
City telecommunications facilities shall be included in the Public Facility Extension Agreement
(FAC) between the developer and the City when the Agreement includes street improvements
per Auburn City Code 12.64a.
11.01 Design Criteria
The City has established the following minimum requirements to ensure the efficient
construction of City telecommunication facilities with the least impact to City transportation
and other utility infrastructure. The design of City telecommunications facilities shall also
meet the requirements of Section 9.03.02, Public and Private Utilities Located
Underground Within City Right-of-Way with the exception that a construction permit is not
required if this work is completed as part of a Facility Extension Agreement.
City telecommunications facilities may be required in conjunction with street improvements
on all roadways classified as Arterial or Collector. Such facilities, when required, shall be
extended the full length of the street improvement. When feasible, placement of the
facilities shall accommodate connection with other existing or future telecommunication
facilities within the corridor.
11.01.01 Conduits
City telecommunication conduits shall be 3-inch PVC Schedule 40 and shall have a
minimum of 24 inches of cover and, except for street crossings, shall be located under the
sidewalk per City of Auburn Standard Detail T-23. If no sidewalk is included in the scope
of the required street improvements, the conduit will be installed in the most feasible
location within the street construction limits as directed by the City. Roadway crossings
shall be minimized and sweeps shall be long sweep 90-degree bends. Trace wire shall be
placed within the conduit. Conduits shall be placed a minimum of 5 feet from other utilities.
11.01.02 Splice Vaults and Pull Boxes
When required, splice vaults and pull boxes shall be per WSDOT Standard Plans J-90.21
and J-90.10, respectively, except that lid marking lettering shall be as specified in the
Construction Standards and lids shall not be marked with WSDOT logos or text indicating
WSDOT. Splice vaults shall be placed every 1,500 feet. Pull boxes shall be placed every
500 feet and at all arterial and collector intersections.