HomeMy WebLinkAbout20091118001265 STORM WATER EASEMENT AND MAINTENANCE AGREEMENT 091108Return Address:
City of Auburn
City Clerk
25 West Main
Auburn, WA 98001
Above this line reserved for recordine information.
STORM WATER EASEMENT AND MAINTENANCE AGREEMENT
~ v ply k
FAC08-0010
ti I?~~Cl~ ~Z-
Reference # (if applicable): N/A
Grantor/Borrower: Cox and Woodward, LLC
Grantee/Assignee/Beneficiary: City of Auburn
Legal Description/STR: NE '/4 SE %5 S18 - T21N - R5E 1
Assessor's Tax Parcel ID4: 2149800275, 2149800276, 2149800277,
2149800278
THIS EASEMENT AND AGREEMENT made and entered into this ~a day of
z ti,h.Ah 2008, by and between the City of Auburn, a municipal corporation
of King County, Washington, hereinafter referred to as "CITY" and
Cox and Woodward, LLC hereinafter referred to as "PROPERTY OWNER".
WHEREAS, PROPERTY OWNER has applied for certain permits with the CITY
for the construction of facilities for Cox and Woodward, LLC located at
1310-13163 d Street SE, which create impervious surface; and
WHEREAS, the PROPERTY OWNER will complete a storm system; 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
Storm Water Easement and Maintenance Agreement
Page I of 18
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
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 a non-exclusive easement to the City for
access, inspection, and maintenance for the purposes of this Agreement and the attached
Storm Water Pollution Prevention Plan, over, under and on that real estate described in
Exhibit "A" & "B" 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.
FAC08-0010, 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" & "B" and incorporated herein by this reference, and shall be a
benefit to the City Storm Drainage Utility System.
Section 2, HEIRS, SUCCESSORS AND ASSIGNS
This Agreement shall be binding upon the heirs, successors and assigns of the
parties.
Storm Water Easement and Maintenance Agreement
Page 2 of 18
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 "C" 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 to
reimburse the CITY for the costs incurred by the CITY in maintaining the stone 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.
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.
Storm Water Easement and Maintenance Agreement
Page 3 of 18
EXECUTED as of the date first written above.
Au~nzed Signature
~1 / Date
;IYiy~--•- `-~X
Aut zed Signature Date
STATE OF WASHINGTON)
ss
COUNTY OF KING )
I certify I have know or have satisfactory evidence that .j ( A CLX
L LJec l is/are the person(s) who appeared before me, and
said p ons)_acknowedged that he/she7tFicystgn~this-instrument on oath stated that
he/she/they wasTwere authorized to execute the instrument and acknowledge as the
of Cox and Woodward LLC, a limited liability company, to be the free and voluntary
act of such party for the uses and purposes mentioned in the instrument.
Dated ~ / i I hp
RI L.
;~~r1381pN~ ~
'j 00?4
~9.t~
~g3MIN '0
Notary Public in and for the
Residing at
My appointment expires-
of W
Storm Water Easement and Maintenance Agreement
Page 4 of 18
CITY OF AUBURN
-G(~- y/z Z'/C' v
Tim Carlaw, Storm Drainage Engineer/ Date
STATE OF WASHINGTON)
)ss.
COUNTY OF KING )
I certify that I know or have satisfactory evidence that Tim Carlaw 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
STORM DRAINAGE 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 71aa/ cs,
F RI ! 61 it ~JutA
O ..,1Md83igy
'IA
-y y -0 ' : m % Notary Pubs' n and for the State Was ington
m 's'ue ~hw °c = Residing ate r~Co (A)L'-'L( fit
0~ My appointment expires
0 `
'/t1,gSH`NG ~z
~
HS/tlb
File: # 1211
REF. H:\Development\Projects\Cox & Woodward Short Plat\FAC08-0010 Cox & Woodward\Legal Does
Storm Water Easement and Maintenance Agreement
Page 5 of 18
EXHIBIT "A"
STORM WATER EASEMENT
AUBURN SHORT PLAT NO. SPlA6-0006, AS RECORDED UNDER
RECORDING NO. 20070517900005, RECORDS OF KING COUNTY,
WASHINGTON.
SITUATE IN THE CITY OF AUBURN, COUNTY OF KING, STATE OF
WASHINGTON.
STORM WATER EASEMENT
'raj. No.: Date: Design:
.24-
RJF
HEDGES
Engineeringg & Consulting, Inc.
913 Klncald Avenue, Sumner, WA 98390
Storm Water Easement and Maintenance Agreement
Page 6 of 18
EXHIBIT "B"
N.T.S.
LINE TABLE
LENGTH
REARING
aaa~
Nes3rvro
1A91
HBT08RYV
CURVE TABLE
ERGTH
RADIUS
DELTA
a
"JAy
X71
zaa
reAMP
STORM WATER EASEMENT
Dote: Deeign:
9/19/OS RJF
.4 Engine DG ES tiumne c WA 98390
Storm Water Easement and Maintenance Agreement
Page 7 of 1S
3rd Street SE
EXHIBIT `C'
HEDGES
Engineering & Consulting, Inc.
913 Kincaid Avenue, Sumner, Washington 98390
STORMWATER POLLUTION PREVENTION PLAN
FOR THE
COX & WOODWARD SHORT PLAT
PERMIT #FAC08-0010
August d, 2008
Project Site Information:
The project is located in the NEY< of the SEf< of Section '18; Township 21 North,
Range 5 East, W.h1., at 1310 through 1316 3r° Street SE, Auburn, WA 98002.
Parcel Numbers:
2149800275,2149800276,2149800277,2149800278
Proponent/Owner: Woodward & Cox, LLC.
37226 33"1 Avenue South
Auburn, WA 98001
Phone: (253) 208-9653
Prepared By: Jeremy W. Metzler, E.I.T.
Reviewed By: David T. Hedges, P.E.
Hedges Engineering & Consulting, Inc.
913 Kincaid Avenue
Sumner, WA 98390
Phone: (253) 891-9365
Storm Water Easement and Maintenance Agreement
Page 8 of 18
Introduction
EXHIBIT `C'
The Cox & Woodward Short Plat project consists of four new two-family residences
(duplexes) on Auburn Short Plat SPL06-0006, recorded under King County AFN
20070517900005. This Stormwater Pollution Prevention Plan has been prepared to address
the City of Auburn's site development and storm drainage requirements for this project.
The project site is located on the south side of 3"' Street SE, between N Street SE and 0
Street SE. Prior to development, the site was vacant with open lawn space and few trees.
Storm water was contained on-site due to naturally well-drained soil conditions, providing
groundwater recharge. On-site explorations have uncovered fine loamy sands, and coarser
sands and gravel at depths below seven feet. Historically, this area may have been located
in the channel of the Green River, which is currently east and north of the site.
The total site area is 42,535 square feet (0.976 acres), of which about 23,130 square feet
(0.531 acres) of the site is impervious, consisting of the site access improvements, proposed
duplex buildings, concrete patios and driveway surfaces. The roofs and driveway surfaces
will drain to individual infiltration systems. All remaining surfaces (site access, lawns) will
drain toward a shared infiltration bed. located on the boundary between Lots 1 and 2. Said
infiltration bed is 2'-4" deep.. 54 feet long, and 20 feet wide, containing two rows of
StormTechO SC-310 Chambers wrapped in filter fabric (a.k.a. Isolator" Rows).
Plan Goal
The goal of this Stormwater Pollution Prevention Plan is to prevent adverse environmental
impacts to the City's groundwater supply. This shall be accomplished by the prevention of
unnecessary and hazardous spills, and through the treatment of stor€ilwater runoff prior to
infiltration. Attached to this narrative is a maintenance manual, which offers guidelines to the
owner for storm water facility maintenance
In the rare event that runoff were to overflow the proposed infiltration bed, flows would travel
directly from the proposed inlet (SDCB 41) across City sidewalk, down the proposed
driveway approach, onto 3r' Street SE, down the existing asphalt wedge gutter, and into a
City catch basin only 130 feet east. No adverse downstream impacts are expected, as runoff
should be contained in right-of-way.
Prevention BMPs
During construction activities, every effort shall be made to prevent any accidental spills of
pollutants. Catch basin protection shall be provided for existing drainage structures and
proposed ones as they are constructed. Sediments and pollutants shall not be permitted to
leave the project site. The contractor shall provide a Spill Response Plan for the City's
review and approval- For suggested BMPs, please refer to the current edition of the
Department of Ecology's Stormwater Management Manual for Western Washington, Volume
IV_
The likelihood of hazardous spills occurring on a residential project after construction is
complete is very low. In the event of a spill, floatables and oils shall be trapped in the
primary catch basin located near the northwest comer of Lot 'l. This catch basin shall
contain a water quality control structure according to the City of Auburn standard detail
STORM-03.
Pi?DQ7.24fw00DNlARD & COX TOPORDesigwStom iiSWPPF doc Page 2
Storm Water Easement and Maintenance Agreement
Page 9 of 18
EXHIBIT `C'
Finally, the proposed catch basin shall have "DUMP NO WASTE - DRAINS TO
GROUNDWATER" stenciled on and/or adjacent to the grate. The owner shall be responsible
for sweeping and cleaning the lot as needed, installing storm drainage stenciling, and
providing spill control measures after construction. In case of a spill, call the Department of
Ecology (DOE) at (425) 649-7000. The catch basin, access manholes, and StormTeche
Chambers will be visually inspected for accumulation of debris and silt, and will be
maintained as required by this pollution prevention plan and attachments.
• No. 4 - Control Structure I Flow Restrictor
• No. 5 - Catch Basins
• StormTech(D IsolatorTh4 Row Operations and Maintenance Manual
Treatment BMPs
The combination of water quality control structure and the StormTechM- isolatorT10 Rows will
treat and clean site runoff prior to infiltration. A water quality control structure will be installed
on the outlet from SDCB 41 to trap oils and other floatables, including most sediment, at the
point of entry. The Isolatorm Rows will trap remaining sediment and Total Suspended Solids
(TSS) prior to reaching the infiltration stone bed.
An IsolatorT Row is a row of standard StormTech(~) Chambers wrapped in a pair of filter
fabric strips. These strips of fabric at similarly to a silt fence, capturing and detaining most
Suspended solids while allowing water to pass through at a reasonable rate. Given the
calculated IsolatorThl Row hydraulic loading rate of 0.586 gpm per square foot of chamber
area, and testing results provided by the manufacturer, the system should experience better
than 99% Total Suspended Solids (TSS) removal. This is over '19% better than required by
the Auburn Design Standard 6.05.7.1 C.
The City of Auburn Storm Drainage Utility 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 of Auburn Storm Drainage Utility section.
Inspection
To ensure proper operation of the stormwater facilities, inspections of the stormwater
facilities must occur at least twice annually (spring and fall)- Records of inspection and
maintenance will be kept for five (5) years by the owners and will be available for City
inspector review. An Inspection and Maintenance Review Checklist is included.
Maintenance
Routine maintenance of the site will include mowing, care of landscaping, and the removal of
trash and debris from the drainage system- The access road and driveways should be kept
clean and in repair. Events such as major storms or heavy winds will require immediate
inspections for damages. Be careful to avoid introducing landscape fertilizer to groundwater.
To ensure proper water quality and treatment, the StormTechS infiltration system must be
properly maintained. Catch basins and manholes shall be cleaned when the sump is 113 full
of sediment and debris Maintenance of the StormTechc- chambers can be performed
entirely from the proposed access, with almost no impact to residents- Two Type 1 catch
basins serve as inlet structures to the StormTechT) IsolatorTm Rows, which will be located
P QG47.24(WOOD'WARD & COX TOPO)0esign;StomilSWPFP hoc Page 3
Storm Water Easement and Maintenance Agreement
Page 10 of 18
EXHIBIT `C'
immediately adjacent to the access. lsolatori°" Row sediment levels can be seen in one of
these structures, or by one of two inspection ports (one located at the east end of each row)-
A Vector truck parked in front of the inlet structures can perform maintenance without
blocking access to the residences or disturbing back yard areas. Please refer to the
IsolatorTM Row O&M Manual. attached-
Proponent/Owner.
Woodward & Cox, LLC.
37226 33rd Avenue South
Auburn, WA 98001
Phone: (253) 208-9653
Design Engineer:
David T. Hedges; P.E.
Hedges Engineering & Consulting, Inc.
913 Kincaid Avenue
Sumner, WA 98390
Phone: (253) 891-9365
Plan and/or Information Updates:
The City of Auburn Storm Drainage Utility 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 of Auburn Storm Drainage Utility section-
P 1200724(A'OOD'dVARD & COX T0PO)0esign%S~omi%&0JPPP,doc
Page J
Storm Water Easement and Maintenance Agreement
Page 11 of 18
EXHIBIT `C'
INSPECTION AND MAINTENANCE REVIEW CHECKLIST
{°d
} rt I
s r h1f{iIi is i i~'
STRUCTURE
:
N Al
:
Results !
Date
Maintenance
Inspection
Results
Catch Basin
Maintenance
Done
Inspection
Results
Access Manholes
Maintenance
Done
Inspection
Results
Conve
ance Pi
es
y
p
Maintenance
Done
Inspection
Flow Restrietor
Results
S
di
t C
t
l
(
e
men
on
ro
Maintenance
Riser)
Done
Inspection
StormTechO
Results
Isolator"' Row
Maintenance
Done
P k20C7,24(WOOD'AARD & COX T4P0y\Deslgn%Storm%SWPPP.doc
page 5
Storm Water Easement and Maintenance Agreement
Page 12 of 18
EXHIBIT `C'
No. 4 - Control Structure/Flow Restrictor
Maintenance
Defect
Condition When Maintenance is
Results Expected When
Component
Needed
Maintenance is
Performed
General
Trash and Debris
Material exceeds 25% of sump
Control structure orifice is
(includes Sediment)
depth or I foot below orifice plate.
not blocked. AEI trash and
debris removed.
Structural Damage
Structure is not securely attached
Structure securely
to manhole wail.
attached to wall and outlet
pipe.
Structure is not in upright position
Structure in correct
(allow up to 10% from plumb)_
position.
Connections to outlet pipe are not
Connections to outlet pipe
watertight and show signs of rust
are watertight, structure
repaired or replaced and
works as designed.
Any holes, other than designed
Structure has no holes
holes, in the structure.
other than designed holes.
Cleanout Gate
Damaged or Missing
Cleanout gate is not watertight or
Gate is watertight and
is missing.
works as designed.
One maintenance person cannot
Gate moves up and down
move up and down gate.
easily and is watertight.
Chaintrod leading to gate is
Chain is in place and
missing or damaged.
works as designed.
Gate is rusted over 50% of its
Gate is repaired or
surface area.
replaced to meet design
standards.
Orifice Plate
Damaged or f0issing
Control device is not working
Plate is in place and
properly due to missing, out of
works as designed.
place, or bent orifice plate.
Obstructions
Any trash, debris, sediment, or
Plate is free of all
vegetation blocking the plate.
obstructions and works as
designed.
Overflow Pipe
Obstructions
Any trash or debris blocking (or
Pipe is free of all
having the potential of blocking)
obstructions and works as
the overflow pipe.
designed.
Manhole
See "Closed
See "Closed Detention Systems"
See "Closed Detention
Detention Systems"'
(No. 3).
Systems" (No. 3).
(No. 3).
Catch Basin
See "Catch Basins"
See "Catch Basins" (No. 5).
See "Catch Basins" (NO.
(No. 5).
I
5).
P L007.24('VYCODWARD & COX TOPO)0esigmSiorm4SV4PPP.doc
Page 6
Storm Water Easement and Maintenance Agreement
Page 13 of 18
EXHIBIT'C'
No. 5 - Catch Basins
Maintenance
Defect
Conditions Men Maintenance is :
Results Expected wheit
Compoffettt
Needed
Maintenance is
performed
General
Trash &
Trash or debris which is located
No Trash or debris located
Debris
immediately in front of the catch basin
immediately in front of
opening or is blocking inletting capacity of
catch basin or on grate
the basin by more than 10%.
opening.
Trash or debris (in the basin) that exceeds
No trash or debris in the
60 percent of the sump depth as
catch basin.
measured from 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 119 of its height.
of trash or debris.
Dead animals or vegetation that could
No dead animals or
generate odors that could cause
vegetation present within
complaints or dangerous gases (e.g.,
the catch basin.
methane)-
Sediment
Sediment (in the basin) that exceeds 60
No sediment in the catch
percent of the sump depth as measured
basin.
from 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 Weer than 14 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
separations of more than 3/4 inch of the
the user rings or top slab
frame from the top slab. Frame not
and firmly attached.
securely attached
Fractures or
Maintenance person judges that structure
Basin replaced or repaired
Cracks in
is unsound.
to design standards..
Basin Walls!
Bottom
Grout fillet has separated or cracked wider
Pipe is regrouted and
than 112 inch and longer than t root at the
secure at basin wall.
joint of any inletfoutiet pipe or any
evidence. of soil particles entering catch
basin through cracks.
Settlement'
If failure of basin has created a safety,
Basin replaced or repaired
Misalignment
function, or design problem.
to design standards.
Vegetation
Vegetation growing across and blacking
No vegetation blocking
more than 10% of the basin opening.
opening to basin.
P: 12007.24('a4'OODWARD & COX TOPO)iDesignlStomi,,S'.tiPPP.;•oe
Page 7
Storm Water Easement and Maintenance Agreement
Page 14 of 18
EXHIBIT `C'
No. 5 - Catch Basins
Maintenance
Defect
Conditions When Maintenance is
Results Expected When '
Component
Needed
Maintenance is
performed
Vegetation growing in inlet/outlet pipe
No vegetation or root
joints that is more than six inches tall and
growth present.
less than 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
closed.
maintenance.
Locking
Mechanism cannot be opened by one
Mechanism opens with
Mechanism
maintenance person with proper tools.
proper tools.
Not Working
Bolts into frame have less than 112 inch of
thread.
Cover Difficult
One maintenance person cannot remove
One maintenance person
to Remove
lid after applying normal lifting pressure.
can remove cover.
(Intent is keep cover from sealing off
access to maintenance.)
Ladder
Ladder Rungs
Ladder is unsafe due to missing rungs,
Ladder meets design
Unsafe
not secu" attached to basin wall,
standards and allows
misalignment, rust, cracks, or sharp
maintenance person safe
edges.
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
Grate free of trash and
Debris
than 200/ of grate surface inketting
debri&
capacity-
.
Damaged or
Grate missing or broken member(s) of the
Grate is in place and
Missing.
grate.
meets design standards.
P",2007.24('OVC ODWARD 8 COX TOPO)\DesignlStomiiS'APPP.doc
Page 8
Storm Water Easement and Maintenance Agreement
Page 15 of 18
:+amnmrrhww..w~
EXHIBIT tray
lsolatW Row 0&M Manual
StormTech' Chamber System for Stormwater Mariiagement
LO The Iso.latee Raw
1.1 MTA0DlTCT N
An ty"ar4 component of any Stormwater Pol6nton
Preveralon Man Is Inspection and maintenance. The
StormTech isolator Raw is a patent panting technique
to Irtetrpansfvely enilwco Total Suspended Solids (TSS)
rengval and provide easy access for Inspection and
maintenance.
1.2 THE OWT1>Tt" RI V
The Isolator Row is a row of StorniTech chambers. 6fhar
SG740 a 50370 models. that Is surroumead with firer
fabric and connected to a closely located marthote for
easy accost. The fabric-wrapped CINOITO rs provhle rot
setting and Motion ad socilment as storm water rises In
the Isolator Row and ultimately passes through Vie Filter
fabric, Theopen bOUbta chambaCS and pedOraWd sib
waft aliwr storm "a to pew bah vorllcafy and horizon-
rally out at the chambers. Sediments are capaxed In the
isolator Row protecting the storage oreos of be Ole-
cent stone and Chambers from sediment atxwmulatlOrl
The Isolator Row is typlt:01 desVied to cglture the
'first Gash' and offers Me versatility to be Sized on a Va
were basis or Dow rate basis. An upstream manhole not
only provides access to the Isolator Row but typically
Includes a high flow weir such that 5101m water W wales
or voumes that eta:eed the capacity of the Isolator Row
overtop the over flow weir and discharge through a
mambld to the other charibert,
The Isolates Row may also be, past of a treatment train.
9y treating storm water prior to entry into the chamber
system, the suite life can be eMerulad and pollutants
SUCK at hydrocarhats can be Captured. Pwitteatment
best meo"ntent practices can be as simple as deep
sump catch basics, oil-water separators or can be inno-
vativis storm water treatment devlte4. The design Or
the treatment trait and selection of pretreatment devices
by the design eVneer is often driven by regulatory
tecldraments. Whether pretreatment its used Or TIM the
WafOr Row Is recommended by StormToch as an
effective means to mlNmIze malrftenerice nxii ilremetis
and mairitimance costs.
Note: See the StOrM760 DDstgn Afatrzrai for desired
hvnneanon on deslip" WKS for a SIO(mTech system.
bacadd8da the rsolsox Row
Storm Water Easement and Maintenance Agreement
Page 16 of 18
taokkg loan Yr lwJsAor&mr inter Ma ateaparritgs rtoaat
gaoarbdr7r h 5lrodrtbetaioat ~ dialMar and staraDaar,
StormTech Isolator Row with Overflew Spillway
lnoi to state)
EJCHIBIT 'G'
2.0 Isolator Row InVection/Maintenance
2.9 111IMMtON
The ffegt my of inspection and Maintenance varies
by location. A routtm inspection schedule creeds to be
astablishad for each Ittlddusal location based goon she
sped variables. The type of"use (I.e. kidustria4
commercial resllatkiaq. anticipated p0anant load. per-
cent imparvlousrness, cdmate, etc. all play a critical role
it cietermkdng the actual traciuancy of Inspection and
mahnwarics praWces.
At a minimum. StormTech recomMands annual Inspec-
tloM IrdtIn9yl rho Isolator Row ShOVId be Inspected every
6 rrloMhs for Me" year of operation. for subsequent
years, the Inspection should be adjusted based goon
prevtots observation of sodimeM deposition,
The Isolator Row Incorporates a combination of standard
manhole(s) and strategically located inspection ports
(as needed}, The inspection pats allow for easy access
to the system from the surface, Marinating the need to
perram a Confined specs entry Fa Inspection purposes.
It upon visual inspection t Is found that Sediment has
acatrruaated. a stele rod should be Inserted to deter-
mine the depth of sediment. When the average depth
of sedlm0is a fCeeds 3 Inches thrOughout the length of
the isolator Rowe, caeart-o t should be performact
U ATMTUOM
The Isolator Row was designed to reduce the cost of
perlodic maintenance. By -Isolafl g- sediments tojust
one row, costs are dramatically reduced by ellninrxing
the need to clean out each row of the entire storage
bed. if inspection indicates the potential need for main.
tenance. access is provided ft a r shoe(s) located
on the end(s) of the row for cleanout. V entry Into the
manhole is required please follow local and OSHA rules
for a confined space emrles.
Storm Water Easement and Maintenance Agreement
Page 17 of 18
Eramp/es0lrvhattie3nirtgr1071ki to isOlOlwRow
makrenanca. (Mm art rrasfamladi patios.)
Maintenance Is accomplished with it* Jelvac process,
The Jetdac process utilizes a high pressure water noz-
zle to prod Itself down the Isdata Row while scouring
and suspending sediments. As the nozzle Is retrieved,
the captured pulltards are f ushedl back Into the man-
hole fa vactnrr4ng. Vlost sewer and pipe maintenance
companies have vacuumlioNac combination vehicles.
Selection of an approprlaw JaVac nozzle will Improve
maiiintenar" eldcierey. fi%ed nozzles designed for cul-
verts or large diameter pipe cleaning are preferable,
Rear fat4 jets With an effactlre Weed of at least 45'
are hest- Most MVac reels have 400 feet of hose allow-
Itg maintenance Wan Mister Row Lit 10 50 chambers
long. The JetWc process shall only be parlotmed on
StormTtth Iwistor Rawl that have AASHTO class i
woven peotsrtps (as spst(fiad by swmiech) over
their antputar base atone.
StormToch ieotator Row (not rot scale)
EXHIBIT'C'
3.0 Isolator Raw Step By Step Maintenance Procedures
$1" 1) inspect Isolator Row for sediment Storm7eeh leoNtor Row {nor to scale)
A) Inspection pats (If pxesera)
1. Remove Ild krnn MCI box frame
L Remove cap from inspection riser
11. litho) a gaslillgla and stadia rod,
measure depth of sediment and
record results on molrnenance log.
tv. It sediment is aL or above, 3 inch
depth Focead to Step 2, it not
proceed to step 3.
B) An Isolator Rows
I. Remove cover from manhole at
upstream end d isolator Row
11. Uskg a AashlIght. Inspact down tsotator Row troth otW pipe
t. Ultras on pr>Ls a comers may be usod to avoid a connnea space entry
2. Follow OSHA regulations for coniklad space entry C entering manhote
11. If sediment Is at or ahwe the lower row of sidewall holes (appIcWmately 3 inches) proceed to Step 2,
It not proceed to Step 3.
Stop 2) Clean our Isolator Row using the JKVac process
A) A fixed culvert cleaning nozzle with teat facN nozzle spread of 45 Inches or more Is preferable
B) Apply multiple passes of JetVac undl backfhrsh water is clean
C) Vacuum manhole surf as required
Step 3) Replace all caps, I83s and covers, tecoru observations and actions
Step 4) Inspect & clean catch basins and manholes upstream of the S=mTech system
Sampte MaIntonsatre Log
tormTech®
yAr *n-As7d0•Badrarpa
Subsurface Stormwater Management"
2POarr Poad.SUih104 W t MWd [Con alt, 06101
ROW1188 j .8s2.M I t% 866328001 ( vawtstam+rrhr
5numTethpxaduttsera cm+bral ty tw amore of 8ne.b p818nLC: !t5 Pests; S.aOl.46v:5,51 f.9D3:5, P76163 5.518.7)& 5,8as,8aa;
Pan vos:2.158Af8 OUser U.S, and Foreign Pahats PmdngPo'rrtad in USA
oCoprfigx.All dgmnsarved.Swor10 +LtC,2to4 SO 104.1
Storm Water Easement and Maintenance Agreement
Page 18 of 18