HomeMy WebLinkAbout20031110001394 STORM EASEMENT 111003A3-13- 2-
Return Address:
Citv of Auburn
Citv Clerk 20031.1..x,0001 394 1111
25 West Main
PACIFIC NW TIT EAS 34.00
Auburn, WA 98001 PAGE001 OF Ste
11/10/2003 15:47
EXCI KING COUNTY, WA
EQUIRED
n 0. R 3 Division -
Puty
Above this line reserved for recording; information.
STORM WATER EASEMENT AND MAINTENANCE AGREEMENT
FAC03-0028
Reference # (if applicable): N/A
GrantoriBorrower: Uburna 1, LLC I PN W-T
Grantee/Assignee/Beneficiary: City of Auburn W
Legal Description/STR: NE SE'/e 19-21N-05E
Assessor's Tax Parcel ID#: 192105-9291
THIS EASEMENT AND AGREEMENT made and entered into this day of
, 2003, by and between the City of Auburn, a municipal corporation
of King County, Washington, hereinafter referred to as "CITY" and Uburna I, LLC,
hereinafter referred to as "PROPERTY OWNER".
WHEREAS, PROPERTY OWNER has applied alrie''art.W.Brpe~r~~i~s v1 tithe CITY
for the construction of facilities for a Walgreens locatVVVb,Aubu~~ ay ~aauth, which
create impervious surface; and accommodation only. It has not been
exarnined as to proper exewtion or
as toftsoff
WHEREAS, the PROPERTY OWNER will complete a ststem; and
WHEREAS, the PROPERTY OWNER and the CITY desire that the storm system
be maintained to provide adequate facilities for controlling both the quantity and quality of
storm drainage; and
WHEREAS, for maintenance of a storm system it is necessary to have appropriate
right-of-way to bring in equipment to conduct maintenance functions; and
WHEREAS, maintenance requirement is a covenant running with the land and
binding; upon all heirs, successors and assigns of both parties; and
WHEREAS, the parties desire that this Agreement be recorded to advise heirs,
successors and assigns of both parties as to the existence of this easement and agreement;
and
Storm Water Easement and Maintenance Agreement
Page I of 16
WHEREAS, an easement is needed to bring in maintenance equipment; and
. WHEREAS, the parties are both desirous of permitting inspection of the storm
system to make certain that it is functioning properly and for purposes of determining the
appropriate repairs.
NOW, THEREFORE, BASED UPON MUTUAL COVENANTS TO BE
DERIVED THE PARTIES AGREE AS FOLLOWS:
Section 1, EASEMENT
PROPERTY OWNER hereby provides an easement over, under and on that portion
of the property as showing on the approved Record Drawings revised pursuant to
construction records for the City of Auburn under Permit No. FAC03-0028, which Record
Drawings are hereby incorporated by reference as if set out in full. This easement shall be
a burden to that real estate which is legally described and attached as Exhibit "A" and
incorporated herein by this reference, and shall be of benefit to the City storm utility
system.
Section 2, HEIRS, SUCCESSORS AND ASSIGNS
This Agreement shall be binding upon the heirs, successors and assigns of the
parties.
Section 3, MAINTENANCE
The PROPERTY OWNER agrees to maintain the storm system in accordance with
the ordinances and all applicable codes of the CITY and the Storm Water Pollution
Prevention Maintenance and Operation Schedule attached as Exhibit "B" and incorporated
herein by this reference. The PROPERTY OWNER does hereby agree that the CITY may
enter onto the property of the PROPERTY OWNER via the easement described above to
inspect and perform necessary maintenance if, after the PROPERTY OWNER is given
notice to maintain, the PROPERTY OWNER fails to maintain. Further, the PROPERTY
OWNER agrees the CITY may enter onto the property of PROPERTY OWNER via the
easement described above to perform emergency maintenance in the event of the storm
system's failure which might result in adverse impacts(s) on public facilities or private
facilities of other property owners. In both events the PROPERTY OWNER agrees
he/she/they/it shall reimburse the CITY for the costs incurred by the CITY in maintaining
the storm system. Should the CITY incur attorney's fees and/or costs in enforcing the
agreement and/or in maintaining or collecting maintenance fees, the PROPERTY OWNER
agrees to pay reasonable attorney's fees and all costs incurred by the CITY.
Storm Water Easement and Maintenance Agreement
Page 2 of 16
Section 4, ACKNOWLEDGMENT OF OTHER ENFORCEMENT ACTIONS
PROPERTY OWNER acknowledges that there may be liability for violations of
codes that could result in additional fines and/or the possibility of incarceration in addition
to the fees for maintenance should violations occur.
EXECUTED as of the date first written above.
CITY OF AUBURN
.Qivv►~.-s fil /0 10-:3
City Engineer Date
d
Own ate
Owner
CNN
File: #958
REF. FI DevelopmentTormsTei gal Documents
Date
Storm Water Easement and Maintenance Agreement
Page 3 of 16
STATE OF WASHINGTON.)
. )ss.
County of King )
I certify that I know or have satisfactory evidence that Dennis Selle is the person who
appeared before me, and said person acknowledged that he signed this instrument, on oath
stated that he was authorized to execute the instrument and acknowledged it as the CITY
ENGINEER of THE CITY OF AUBURN to be the free and voluntary act of such party for
the uses and purposes mentioned in this instrument.
Dated '/0 o7e of
6' t
. o t10TAR;- ran'; i
:U rn.
PUBLIC
OP &;i~\tlf
STATE OF WASHINGTON)
)ss.
COUNTY OF KING )
- A Kr,. C
Notary Public in and for the Statepf Wa hington
Residing at CAA eo >L y
My appointment expires it /rC/0,3
I certify I have know or have satisfactory evidence that 0 i CM Umn
islaw.c~ the person(,4 who appeared before me, and said person(s) acknowledged that
he/off signed this instrument on oath stated that he/shefthey was/were authorized to
execute the instrument and acknowledge as the
of C-a limited liability company, to be the free and voluntary a of such party for the uses and
purposes mentioned in the instrument.
Dated
~?3
0; F+q;yZ
NOTARY 9 ; C =
rn? 0
PUBL(C
/I- Notary Pu lic in and for the State of Washington
17 V
X 'Z
WASN~~Residing at Zs ►.l~
1111416110% My appointment expi 7- 1'1-01
Storm Water Easement and Maintenance Agreement
Page 4 of 16
EXHIBIT "A"
SITE ADDRESS
1701 AUBURN WAY SOUTH - WALGREEN'S
PARCEL NUMBERS
1921059291 - EX. SHELLEY'S SUN TAN
1921059073 - EX. SHOPPING CENTER
LEGAL DESCRIPTION
THAT PORTION OF THE NORTHEAST % OF THE SOUTHEAST % OF SECTION 19, .
TOWNSHIP 21 NORTH, RANGE 5 EAST W.M., AND OF LOTS 7 AND 8 OF WADKIN'S SECOND
ADDITION, AS PER PLAT RECORDED IN VOLUME 70 OF PLATS, PAGE 58, RECORDS OF
KING COUNTY, DESCRIBED AS FOLLOWS:
BEGINNING AT THE NORTHWEST CORNER OF THE NORTHEAST % OF THE SOUTHEAST'/.
OF SAID SECTION 19; THENCE IN AN EASTERLY DIRECTION 128 FEET TO THE WEST
MARGINAL LINE OF COUNTY ROAD, KNOWN AS ENUMCLAW PAVED HIGHWAY; THENCE IN
A SOUTHEASTERLY DIRECTION ALONG THE WEST LINE OF SAID HIGHWAY, A DISTANCE
OF 825.60 FEET; THENCE WESTERLY 649.10 FEET TO A POINT 560.30 FEET SOUTH OF
NORTHWEST CORNER OF NORTHEAST % OF THE SOUTHEAST '/a OF SAID SECTION 19;
THENCE NORTH ALONG THE WEST LINE OF SAID NORTHEAST % OF THE SOUTHEAST
OF SAID SECTION 19, A DISTANCE OF 560.30 FEET TO THE POINT OF BEGINNING;
EXCEPT PORTION THEREOF LYING WITHIN PRIMARY STATE HIGHWAY NO. 5;
AND EXCEPT THE NORTH 30.0 FEET IN WIDTH;
AND EXCEPT THAT PORTION THEREOF CONVEYED TO THE CITY OF AUBURN FOR
STREET PURPOSES BY DEED RECORDED UNDER KING COUNTY RECORDING NO.
6165640, BEING A RIGHT-OF-WAY 50 FEET WIDE WITH 25 FEET ON EACH SIDE OF THE
FOLLOWING DESCRIBED CENTERLINE:
BEGINNING AT THE NORTHWEST CORNER OF GOVERNMENT LOT 11; THENCE ALONG
THE NORTH SIDE OF SAID GOVERNMENT LOT 11, NORTH 89°38'35" EAST 25 FEET TO THE
TRUE POINT OF BEGINNING; THENCE SOUTH PARALLEL TO THE WEST LINE OF SAID
GOVERNMENT LOT 11, SOUTH 00°15'30" WEST 445.0 FEET; THENCE THROUGH A CURVE
TO THE LEFT HAVING A RADIUS OF 100.0 FEET FOR AN ARC LENGTH OF 99.48 FEET, SAID
ARC HAVING A CENTRAL ANGLE OF 57°00'00"; THENCE SOUTH 56°44'30" EAST 23.85 FEET;
THENCE THROUGH AN ARC TO THE RIGHT HAVING A RADIUS OF 100 FEET FOR AN ARC
LENGTH OF 99.48 FEET, SAID ARC HAVING A CENTRAL ANGLE OF 57°00'00" TO THE
TERMINAL POINT OF THIS DESCRIBED CENTERLINE BEING A POINT ON THE CENTERLINE
OF THE EXISTING M STREET S.E.;
AND EXCEPT PORTION LYING WITHIN LOT 7 OF SAID WADKIN'S SECOND ADDITION;
TOGETHER WITH THAT PORTION OF VACATED STREET PURSUANT TO ORDINANCE NO.
2634 OF THE CITY OF AUBURN;
SITUATE IN THE CITY OF AUBURN, COUNTY OF KING, STATE OF WASHINGTON.
Storm Water Easement and Maintenance Agreement
Page5of16
EXHIBIT 'B'
STORM WATER POLLUTION PREVENTION PLAN
For
WALGREENS STORE #07480
SEPA NO. 02-0032
FAC NO. 03-0028.
Site Address
The project is located in SE 1/4 of Section 19, Township 21 North, Range 5
East, W.M., 1701 Auburn Way South, Auburn, Washington. The tax parcel
number is 192105-9291.
Introduction
This storm drainage technical information reporthas been prepared to
address the City of Auburn's site development and storm drainage
requirements for the proposed Walgreens Store #07480 located at 1707
Auburn Way South, Auburn, Washington. The site has an area of
approximately 1.17 acres and is currently occupied by Shelley's Sun Tan
with an existing retail building, parking lot, landscaping and surrounding
sidewalk and developed roadway.
The subject site will be redeveloped. Construction will include removal of
the. existing on-site retail building and a portion of the adjacent shopping
center building. Existing landscaping and pavement areas will be removed.
A new Walgreens store will be constructed with associated parking,
landscaping, drainage and utilities. A portion of "M" Street SE will be
widened and channelization/lighting improvements provided. Project will
also involve a boundary line adjustment.
According to the City of Auburn's Construction Standards for storm water
management, the city requires storm water quantity and quality control to all
proposed developments. We have proposed to collect all of the storm
water runoff from the landscaped, building and pavement areas in a series
of catch basins. This water has been conveyed by storm drainage pipe to a
storm water infiltration tank facility located within the proposed north
parking lot. Here the storm water is released into the underground sandy
soils. A Vortechs treatment vault is installed to treat all pavement runoff
prior to discharge to the infiltration system. All roof areas bypass the
Storm Water Easement and Maintenance Agreement
Page 6 of 16
treatment vault. In the event of failure or overcapacity of the infiltration
facility, a gravity overflow will occur at the northwest driveway onto "M"
Street.
Plan Goal
The specific purpose for the storm water facility is to minimize pollution that
is typically associated with modern development. In general, pollution from
motor vehicles and pollution generated from erosion. Attached to this
narrative is a maintenance manual, which offers guidelines to the owner for
storm water facility maintenance.
Prevention BMP'S
The catch basins shall have stenciled on them "DUMP NO WASTE -
DRAINS TO STREAM." The owner shall be responsible for sweeping the
lot, installing storm drainage stenciling and provide spill control procedures.
In case of spill call DOE at 1-425-649-7000. The catch basins,
detention/wetpond, and control structures will be visually inspected for
accumulation of debris and silt and will be maintained as required by this
pollution prevention plan and attachments.
Maintenance Standards for Drainage Facilities
No. 3 - Closed Detention Systems (Tanks/Vaults)
No. 4 - Control Structure/Flow Restrictor
No. 5 - Catch Basins
No. 10 - Vortechs Treatment Vault
(Department of Ecology Storm Water Manual, August 2001)
Treatment BMP'S
A Vortechs treatment vault has been installed to treat runoff for
conventional pollutants. The treatment vault was designed to treat 64% of
the 2-year storm event (water quality storm) for water quality treatment. In
addition, the infiltration tank facility was designed to accommodate the 25-
year/24-hour storm with an emergency overflow via the northern "M" Street
driveway.
The City of Auburn Utilities Section is to review and approve any changes
to this Storm Water Pollution Prevention Plan prior to changes in its
implementation. Additionally, any changes in ownership or person of
responsibility are to be reported to the City Utilities Sections.
Storm Water Easement and Maintenance Agreement
Page 7 of 16
Inspection/Maintenance
Regular inspections of the drainage facilities should be carried out twice per
year, in the spring and fall. The responsible party.should keep records of
these inspections. available for review by the City. Additional inspections
may be required after severe seasonal storms.
Routine maintenance of the site will include mowing, care of landscaping
and the removal of trash and debris from the drainage system. The parking
lots and driveways should be kept clean and in repair. Events such as
major storms or heavy winds will require immediate inspections for
damages.
To ensure proper water quality and treatment, the maintenance
requirements for the . Vortechs Stormwater Treatment System shall be
adhered to.
Catch Basins shall be cleaned when sump is 1/3' full of sediment or debris.
Person of Responsibility
Uburna I, LLC
2333 Carillon Pointe
Kirkland, WA 98033
Contact: Dan Taylor
Phone: (425) 827-7499
Design Engineer
Terraforma Design Group, LLC
500936 th Avenue SW
Seattle, WA 98126
Contact: Pedro DeGuzman
Phone: (206) 923-0590
Plan and/or Information Updates
The City of Auburn Utilities Section is to review and approve any changes
to this Storm Water Pollution Prevention Plan prior to changes in its
implementation. Additionally, any changes in ownership or person. of
responsibility are to be reported to the City'Utilities Sections.
Storm Water Easement and Maintenance Agreement
Page 8of16
INSPECTIONIMAINTENANCE CHECKLIST
STRUCTURE
DATE OF"INSPECTIONIMAINTENANCE
Results/
Maintenance
Date
Inspection
All Catch Basins
Results
Maintenance
Done
Storm Infiltration
Inspection
System
Results
Maintenance
Done
Inspection
Conveyance Pipes
Results
Maintenance
Done
Flow Control
Inspection
Structure
Results
Maintenance
Done
Vortechs Treatment
Inspection
Vault
Results
Maintenance
Done
Maintenance Standards for Drainage Facilities
The facility-specific maintenance standards contained in this. section are
intended to be conditions for determining if maintenance actions are
required as identified through inspection. They are not intended to be
measures of the facility's required condition at all times between
inspections. In other words, exceeding these conditions at any time
between inspections and/or maintenance does not automatically constitute
a violation of these standards. However, based upon inspection
observations, the inspection and maintenance schedules shall be adjusted
to minimize the length of time that a facility is in a condition that requires a
maintenance action.
Storm Water Easement and Maintenance Agreement
Page 9 of 16
No. 3 - Closed Detention Systems (TanksNaults)
Maintenance
befect
Conditions When Maintenance "is 'Needed'
;
;Results Expected
Component n
When Maintenance is
Performed
Storage Area
Plugged Air Vents
One-half of the cross section of a vent is
Vents open and
blocked at any point or the vent is damaged.
functioning.
Debris and Sediment
Accumulated sediment depth exceeds 10%
All sediment and
of the diameter of the storage area for 1/2
debris removed from
length of storage vault or any point depth
storage area.
exceeds 15% of diameter.
(Example: 72-inch storage tank would
require cleaning when sediment reaches
depth of 7 inches for more than 1/2 length of
tank.)
Joints Between
Any openings or voids allowing material to
All joint between
Tank/Pipe Section
be transported into facility.
tank/pipe sections
are sealed.
(Will require engineering analysis to
determine structural stability.)
Tank Pipe Bent Out
Any part of tank/pipe is bent out of shape
Tank/pipe repaired or
of Shape
more than 10% of its design shape.
replaced to design.
(Review required by engineer to determine
structural stability.)
Vault Structure
Cracks wider than 1/2-inch and any
Vault replaced or
Includes Cracks in
evidence of soil particles entering the
repaired to design
Wall, Bottom,
structure through the cracks, or
specifications and is
Damage to Frame
maintenance/inspection personnel
structurally sound.
and/or Top Slab
determines that the vault is not structurally
sound.
Cracks wider than 1/2-inch at the joint of
No cracks more than
any inlet/outlet pipe or any evidence of soil
1/4-inch wide at the
particles entering the vault through the
joint of the inlet/outlet
walls.
pipe.
Manhole
Cover Not in Place
Cover is missing or only partially in place.
Manhole is closed.
Any open manhole requires maintenance.
Locking Mechanism
Mechanism cannot be opened by one.
Mechanism opens
Not Working
maintenance person with proper tools.
with proper tools.
Bolts into frame have less than 1/2 inch of
thread (may not apply to self-locking lids).
Cover Difficult to
One maintenance person cannot remove lid
Cover can be
Remove
after applying normal lifting pressure. Intent
removed and
is to keep cover from sealing off access to
reinstalled by one
maintenance.
maintenance person.
Ladder Rungs Unsafe
Ladder is unsafe due to missing rungs,
Ladder meets design
misalignment, not securely attached to
standards. Allows
structure wall, rust, or cracks.
maintenance person
safe access.
Catch Basins
See "Catch Basins"
See "Catch Basins" (No. 5).
See "Catch Basins" .
(No. 5)
(No. 5).
Storm Water Easement and Maintenance Agreement
Page 10 of 16
No. 4 - Control Structure/Flow Restrictor
Maintenance
Defect `
Condition When Maintenance is Needed
Results Expected
Component
When Maintenance
is Performed
General
Trash and Debris
Material exceeds 25% of sump depth or 1
Control structure
(Includes Sediment)
foot below orifice plate.
orifice is not blocked.
All trash and debris
removed.
Structural Damage
Structure is not securely attached to
Structure securely
manhole wall.
attached to wall and
outlet pipe.
Structure is not in upright position (allow up
Structure in correct
to 10% from plumb).
position.
Connections to outlet pipe are not watertight
Connections to outlet
and show signs of rust.
pipe are watertight;
structure repaired or
replaced and works
as designed.
Any holes, other than designed holes, in the
Structure has no
structure,
holes other than
designed holes.
Cleanout Gate
Damaged or Missing
Cleanout gate is not watertight or is missing.
Gate is watertight
and works as
designed.
Gate cannot be moved up and down by one
Gate moves up and
maintenance person.
down easily and is
watertight.
Chain/rod leading to gate is missing or
Chain is in place and
damaged.
works as designed.
Gate is rusted over 50% of its surface area.
Gate is repaired or
replaced to meet
design standards.
Orifice Plate
Damaged or Missing
Control device is not working properly due
Plate is in place and
to missing, out of place, or bent orifice plate.
works as designed.
Obstructions
Any trash, debris, sediment, or vegetation
Plate is free of all
blocking the plate.
obstructions and
works as designed.
Overflow Pipe
Obstructions
Any trash or debris blocking (or having the
Pipe is free of all
potential of blocking) the overflow pipe.
obstructions and
works as designed.
Manhole
See "Closed
See "Closed Detention Systems" (No. 3).
See "Closed
Detention Systems"
Detention Systems"
(No. 3).
(No. 3).
Catch Basin
See "Catch Basins"
See "Catch Basins" (No. 5).
See "Catch Basins"
(No. 5).
(No. 5).
Storm Water Easement and Maintenance Agreement
Page I I of 16
No. 5 - Catch Basins
Maintenance,
Defect
a s `
Conditions When Maintenance"is Needed
Results Expected When
Component
Maintenance is
'
performed
General
Trash &
Trash or debris which is located immediately
No Trash or debris
Debris
in front of the catch basin opening or is
located immediately in
blocking inletting capacity of the basin by
front of catch basin or on
more than 10%.
grate opening.
Trash or debris (in the basin) that exceeds 60
No trash or debris in the
percent of the sump depth as measured from
catch basin.
the bottom of basin to invert of the lowest
pipe into or out of the basin, but in no case
less than a minimum of six inches clearance
from the debris surface to the invert of the
lowest pipe.
Trash or debris in any inlet or outlet pipe
Inlet and outlet pipes free
blocking more than 1 /3 of its height.
of trash or debris.
Dead animals or vegetation that could
No dead animals or
generate odors that could cause complaints
vegetation present within
or dangerous gases (e.g., methane).
the catch basin.
Sediment
Sediment (in the basin) that exceeds 60
No sediment in the catch
percent of the sump depth as measured from
basin.
the bottom of basin to invert of the lowest
pipe into or out of the basin, but in no case
less than a minimum of 6 inches clearance
from the sediment surface to the invert of the
lowest pipe.
Structure
Top slab has holes larger than 2 square
Top slab is free of holes
Damage to
inches or cracks wider than 1/4 inch.
and cracks.
Frame and/or
Top Slab
(Intent is to make sure no material is running
into basin.)
Frame not sitting flush on top slab, i.e.,
Frame is sitting flush on
separation of more than 3/4 inch of the frame.
the riser rings or top slab
from the top slab. Frame not securely
and firmly attached.
attached.
Fractures or
Maintenance person judges that structure is
Basin replaced or
Cracks in
unsound.
repaired to design
Basin Walls/
standards.
Bottom
Grout fillet has separated or cracked wider
Pipe is regrouted and
than 1/2 inch and longer than 1 foot at the
secure at basin wall.
joint of any inlet/outlet pipe or any evidence
of soil particles entering catch basin through
cracks.
Settlement/
If failure of basin has created a safety,
Basin replaced or
Misalignment
function, or design problem.
repaired to design
standards.
Vegetation
Vegetation growing across and blocking
No vegetation blocking
more than 10% of the basin opening.
opening to basin.
Storm Water Easement and Maintenance Agreement
Page 12 of 16
No. 5 -Catch Basins
Maintenance
Defect
Conditions When Maintenance is Needed
Results Expected When
Componen
t
Maintenance is
performed
Vegetation growing in inlet/outlet pipe joints
No vegetation or root
that is more than six inches tall and less than
growth present.
six inches apart.
Contamination
See "Detention Ponds" (No. 1).
No pollution present.
and Pollution
Catch Basin
Cover Not in
Cover is missing or only partially in place.
Catch basin cover is
Cover
Place
Any open catch basin requires maintenance,
closed
Locking
Mechanism cannot be opened by one
Mechanism opens with
Mechanism
maintenance person with proper tools. Bolts
proper tools.
Not Working
into frame have less than 112.inch of thread.
Cover Difficult
One maintenance person cannot remove lid
Cover can be removed by
to Remove
after applying normal lifting pressure.
one maintenance person.
(Intent is keep cover from sealing off access
to maintenance.)
Ladder
Ladder Rungs
Ladder is unsafe due to missing rungs, not
Ladder meets design
Unsafe
securely attached to basin wall,
standards and allows
misalignment, rust, cracks, or sharp edges.
maintenance person safe
access.
Metal Grates
Grate opening
Grate with opening wider than 7/8 inch.
Grate opening meets
(If Applicable)
Unsafe
design standards.
Trash and
Trash and debris that is blocking more than
Grate free of trash and
Debris
20% of grate surface inletting capacity.
debris.
Damaged or
Grate missing or broken member(s) of the
Grate is in place and
Missing.
grate.
meets design standards.
Storm Water Easement and Maintenance Agreement
Page 13 of 16
No. 20 - VortechsTA° Treatment Vault
Maintenance-
Defect
condition When Ma ntenance is
Results Expected When s
Component :
-
Needed '
Maiptenance is Performed
Below Ground
Sediment
Sediment depth exceeds 12-inches in
No sediment deposits in vault
Vault
Accumulation in
first chamber. Should be inspected
bottom of all chambers:
Vault
every 3 months.
Trash/Debris
Trash and debris accumulated on in the
Trash and debris removed from
Accumulation
first chamber.
the first chamber.
Access Cover
Cover cannot be opened; one person
Cover repaired to proper
Damaged/Not
cannot open the cover using normal
working specifications or
Working
lifting pressure, corrosion/deformation of
replaced.
cover.
Vault Structure
Cracks wider than 1/2-inch or evidence
Vault replaced or repairs made
Includes Cracks
of soil particles entering the structure
so that vault meets design
in Wall, Bottom,
through the cracks, or maintenance/
specifications and is structurally
Damage to
inspection personnel determine that the
sound.
Frame and/or
vault is not structurally sound.
Top Slab
Cracks wider than 1/2-inch at the joint of
Vault repaired so that no cracks
any inlet/outlet pipe or evidence of soil
exist wider than 1/4-inch at the
particles entering through the cracks.
joint of the inlet/outlet pipe.
Baffles/Weirs
Baffles/weirs corroding, cracking
Baffles/weirs repaired or
warping, and/or showing signs of failure
replaced to specifications.
as determined by maintenance/
inspection person.
See attached supplemental maintenance notes provided Vortechs
manufacturer.
The Vortechs® System should be inspected at regular intervals and maintained
when necessary to ensure optimum performance. The rate at which the System
collects pollutants will depend more heavily on site activities than the size of the
unit, e.g., unstable soils or heavy winter sanding will cause the grit chamber to fill
more quickly but regular sweeping will slow accumulation.
Inspection
Inspection is the key to effective maintenance and is easily performed.
Vortechnics recommends ongoing quarterly inspections of the accumulated
sediment. Pollutant deposition and transport may vary from year to year and
quarterly inspections will help insure that Systems are cleaned out at the
appropriate time. Inspections should be performed more often in the winter
months in climates where sanding operations may lead to rapid accumulations, or
in equipment washdown areas. It is very useful to keep a record of each
inspection. A simple form for doing so is provided.
Storm Water Easement and Maintenance Agreement
Page 14 of 16
The Vortechs® System should be cleaned when inspection reveals that the
sediment depth has accumulated to within six inches of the dry-weather water
surface elevation. This determination can be made by taking 2 measurements
with a stadia rod or similar measuring device; one measurement from the manhole
opening to the top of the sediment pile and the other from the manhole opening to
the water surface. The System should be cleaned out if the difference between
the two measurements is six inches or less. Note: to avoid underestimating the
volume of sediment in the chamber, the measuring device must be lowered to the
top of the sediment pile carefully. Finer, silty particles at the top of the pile
typically offer less resistance to the end of the rod than larger particles toward the
bottom of the pile.
Cleaning
Maintaining the VortechsO System is easiest when there is no flow entering the
System. For this reason, it is a good idea to schedule the ceanout during dry
weather. Cleanout of the VortechsO System with a vacuum truck is generally the
most effective and convenient method of excavating pollutants from the System.
If such a truck is not available, a "clamshell" grab may be used, but it is difficult to
remove all accumulated pollutants with such devices.
In Vortechs® installations where the risk of large petroleum spills is small, liquid
contaminants may not accumulate as quickly as sediment. However, an oil or
gasoline spill should be cleaned out immediately. Motor oil and other
hydrocarbons that accumulate on a more routine basis should be removed when
an appreciable layer has been captured. To remove these pollutants, it may be
preferable to use adsorbent pads since they are usually cheaper to dispose of
than the oil water emulsion that may be created by vacuuming the oily layer.
Trash can be netted out if you wish to separate it from the other pollutants.
Accumulated sediment is typically evacuated through the manhole over the grit
chamber. Simply remove the cover and insert the vacuum hose into the grit
chamber. As water is evacuated, the water level outside of the grit chamber will
drop to the same level as the crest of the lower aperture of the grit chamber. It will
not drop below this level due to the fact that the bottom and sides of the grit
chamber are sealed to the tank floor and walls. This "Water Lock" feature
prevents water from migrating into the grit chamber, exposing the bottom of the
baffle wall. Floating pollutants will decant into the grit chamber as the water level
there is drawn down. This allows most floating material to be withdrawn from the
same access point above the grit chamber.
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If maintenance is not performed as recommended, sediment may accumulate
outside the grit chamber. If this is the case, it may be necessary to pump out all
chambers. It is a good idea to check for accumulation in all chambers during each
maintenance event to prevent sediment build up there.
Manhole covers should be securely seated following cleaning activities, to ensure
that surface runoff does not leak into the unit from above.
Storm Water Easement and Maintenance Agreement
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