HomeMy WebLinkAbout2018 - Declaration of Covenant for Inspection and Maintenance of Stormwater Facilities and BMPS - City of Tukwila / Tukwila Village Associates - 20181019000451After Recording Return to:
City Clerk
City of Tukwila
6200 Southcenter Boulevard
Tukwila, WA 98188
111111111111111111111111111111111111111111111
20181019000451
COVENANT Rec: $12100
10/19/2018 12:23 PM
KING COUNTY WA
DECLARATION OF COVENANT FOR INSPECTION AND MAINTENANCE
OF STORMWATER FACILITIES AND BMPS
Grantor(s):
TUKWILA VILLAGE ASSOCIATES (1) LIMITED PARTNERSHIP, a Washington limited partnership,
and TUKWILA VILLAGE COMMERCIAL (1) ASSOCIATES, LLC, a Washington limited liability
company
Grantee(s):
CITY OF TUKWILA, a Washington municipal corporation
Abbreviated Legal Description:
A portion of the SE 1/4 of the SW 1/4 of section 15 and the NE 1/4 of the NW 1/4 of section 22, Township
23 N, range 4 E. in King County Washington. A full Legal Description of the Property is attached hereto as
Exhibit "A".
Assessor's Tax Parcel ID Nos.:
87007-00000 / 00400-0180
Page 1 of 6
DECLARATION OF COVENANT FOR INSPECTION AND MAINTENANCE
OF STORMWATER FACILITIES AND BMPS
IN CONSIDERATION of the Public Works final inspection for City of Tukwila Public Works Permit
No. PW14-0141 relating to the real property ("Property") as described in Exhibit "A" attached hereto and by
this reference incorporated herein, Tukwila Village Associates (1) Limited Partnership, and Tukwila Village
Commercial (1) Associates, LLC (collectively, the "Grantors"), the fee simple owners of that Property,
hereby covenant to the City of Tukwila, a Washington municipal corporation (the "Grantee"), that they will
observe, consent to, and abide by the conditions and obligations set forth and described in the following
Paragraphs 1 through 10 hereof with regard to the. Property, and hereby grant to the Grantee an easement with
respect to the Property as described in Paragraphs 2 and 3 hereof. Accordingly, pursuant to this Declaration
of Covenant for Inspection and Maintenance of Stormwater Facilities and BMPs (the "Declaration of
Covenant"), the Grantors hereby grant, covenant, and agree as follows:
1. The Grantors and their successors in interest and assigns (collectively, the "Owner") shall, at
their own expense, operate, maintain, and keep in good repair, the Property's stormwater facilities and best
management practices ("BMPs") identified in the plans and specifications submitted to the City of Tukwila
for the review and approval of Public Works Permit No. PW 14-0141. The term "stormwater facilities"
includes pipes, catch basins, modular wetlands, vaults and other engineered structures designed to manage
stormwater on the Property. Stormwater BMPs include vegetated areas, permeable pavements, vegetated
roofs, rainwater harvesting systems, reduced impervious surface coverage and other measures designed to
reduce the amount of stormwater runoff on the Property.
2. The City of Tukwila shall have the right of ingress and egress over those portions of the Property
necessary to perform inspections of the stormwater facilities and BMPs and conduct other activities specified
Page 2 of 6
in this Declaration of Covenant and in accordance with City of Tukwila Code ("TMC") 14.30.80. This right
of ingress and egress, right to inspect, and right to perform required maintenance or repair shall be as provided
for in Paragraph 3 below.
3. If the City of Tukwila determines that maintenance or repair work is required to be done to any
of the stormwater facilities or BMPs, the Director of Public Works (the "Director") shall give notice of the
specific maintenance and/or repair work required pursuant to TMC 14.30.80. The Director shall also set a
reasonable time in which such work is to bc completed by the Owner. If the above required maintenance or
repair is not completed within the time set by the Director, the City may perform the required maintenance or
repair, and hereby is granted access to the Property for such purposes. Written notice will be sent to the
Owner stating the City's intention to perform such work. This work will not commence until at least seven
(7) days after such notice is mailed. lf, within the sole discretion of the Director, there exists an imminent or
present danger, the seven (7) day notice period will be waived and maintenance and/or repair work will begin
immediately.
4. If at any time the City of Tukwila reasonably determines that a stormwater facility or BMP on
the Property crcatcs any of the hazardous conditions listed in TMC 14.30.80 and herein incorporated by
reference, the Director or equivalent municipal successor's official may take measures specified therein.
5. The Owner shall assume all responsibility for the cost of any maintenance or repair work
completed by the City as described in Paragraph 3 or any measures taken by the City to address hazardous
conditions as described in Paragraph 4. Such responsibility shall include reimbursement to the City within
thirty (30) days of the receipt of the invoice for any such work performed. Overdue payments will require
payment of interest at the current legal rate as liquidated damages. If legal action ensues, thc prevailing party
is entitled to costs or fees.
6. The Owner is hereby required to obtain written approval from the Director of Public Works prior
to filling, piping, cutting, or removing vegetation (except in routine landscape maintenance) in open
vegetated stormwater facilities (such as swalcs, channels, ditches, ponds, etc.), or performing any alterations
or modifications to the stonnwater facilities and BMPs referenced in this Declaration of Covenant.
Page 3 of 6
~
7. Any notice uxconsent required tohc givenorotherwise provided for 6vthe provisionso[this
Declaration ofCovenant shall bceffective upon personal delivery, ordncc(3)days after mailing hvCcrtificd
Mail, return receipt requested, to the address listed below for that party:
To Grantee:
City Clerk
City ofTukwila
62O08oudhccoiczBlvd.
Tukwila, WA 98108
To
c/o Tukwila Village Development /\naociateo,LLC
l440OTukwila luLnzxdooa|Blvd.
Suitel00
Tukwila, WA 98168
0. With regard to the matters addressed herein, this Declaration of Covenant constitutes the entire
agreement between the parties, and supersedes all prior discussions, ucgohu1iuuu, and all aArcumonia
whatsoever whether oral mwritten.
9. This Declaration of Covenant is intended to protect the value and desirability of the real property
dcauihcd in Exhibit ^^/\" and aba) inure to the bcoo[b of all the citizens of the City of Tukwila. This
Dcokouboo of Covenant uhuU run with the land and be bindingthe Grantors, and the Grantors'
successors in kkureoi and assigns.
lO. This Declaration of Covenant may be \cnnjnukxl by execution of written agreement by the
Owner and the City of Tukwila that is recorded by King County in its real property records.
[The remainder of this page is intentionally left blank. The executing signatures of the Grantors and
Page 4 of 6
IN WITNESS WHEREOF, this Declaration of Covenant for the Inspection and Maintenance of
Stormwater Facilities and BMPs is executed by Grantors on this ),V 1-Nay of August, 2018.
GRANTORS:
Tukwila Village Associates (1) Limited :Partnership,
a Washington limited partnership
By: Tukwila Village Development Associates, LLC,
Its General Partner
By:
Bryan M. Park, Manager
Tukwila Village Commercial (1.) Associates, LLC,
a Washington limited liability company
By: Tukwila Village Development Associate, LLC,
Its Sole Member
By:
Bryan M. Park, Manager
STATE OF WASHINGTON )
)ss.
COUNTY OF KING
I hereby certify that I know or have satisfactory evidence that Bryan M. Park is the person who personally
appeared before me, and said person acknowledged that he signed this instrument on oath stated that he was
authorizcd to execute the instrument and acknowledge it as thc Manager of Tukwila Village Development
Associates, LLC, the General Partner of Tukwila Village Associates (1) Limited Partnership, a Washington
limited partnership, and the Sole Member of Tukwila Village Commercial (1) Associates, LLC, a
Washington limited liability company, to be the free and voluntary act on behalf of said parties for the uses
and purposes mentioned in the instrument.
Dated August 2 I , 2018.
Notary Pub in and for the State of Washington
residing at /
My appointment expires
Page 5 of 6
IN WITNESS WHEREOF, this Declaration of Covenant for the Inspection and Maintenance of
Stormwater Facilities and BMPs is executed by Grantee on this , day of August, 2018.
GRANTEE:
CITY OF TUKWILA, a Washington municipal corporation
Y
Henry ash, PUblic Works Director
STATE OF WASHINGTON
) ss
COUNTY OF KING
f t
On this ik 4 day of August, 2018 before me, the undersigned, a Notary Public in and for the State
of Washington, duly commissioned and sworn, personally appeared Henry Hash, Public Works Director of
the City of Tukwila, Washington, and said person acknowledged that he signed this instrument, on oath
stated that he was authorized to execute the instrument and acknowledged it to be the free and voluntary act
of such party for the uses and purposes mentioned in the instrument.
WITNESS my hand and official seal the day and year first above written.
04.
/ ) itA/
At' ttt? 0
'NOTARY PUBLIC in and for the State of Washington
Residing at: /
My appointment expires: (
Page 6 of 6
Exhibit "A"
Legal Description of Property
The following described real property situate in the City of Tukwila, King County,
Washington:
BEGINNING AT THE INTERSECTION OF THE SOUTH MARGIN OF SOUTH 144TH STREET
AS CONVEYED TO THE CITY OF TUKWILA BY KING RECORDING NO. 20150319001438
AND THE EAST LINE OF SAID LOT 15;
THENCE SOUTH 01'06'33" WEST, 280.19 FEET ALONG SAID EAST LINE TO A POINT ON A
LINE PARALLEL WITH AND 11.50 FEET NORTH OF THE SOUTH LINE OF SAID LOT 15;
THENCE NORTH 87'39'54" WEST, 97.12 FEET
THENCE SOUTH 01'06'50" WEST, 11.50 FEET TO THE SOUTH LINE OF SAID LOT 15;
THENCE NORTH 87'39'54" WEST, 97.33 FEET ALONG SAID SOUTH LINE AND THE SOUTH
LINE OF SAID LOT 14 TO A POINT ON A LINE PARALLEL WITH AND 60.00 FEET EAST OF
THE WEST LINE OF SAID LOT 14;
THENCE NORTH 01'07'07" EAST, 125.03 FEET ALONG SAID PARALLEL LINE TO A POINT
ON A LINE PARALLEL WITH AND 125.00 FEET NORTH OF THE SOUTH LINE OF SAID LOT
14;
THENCE NORTH 87'39'54" WEST, 198.12 FEET ALONG SAID PARALLEL LINE TO THE EAST
MARGIN OF TUKWILA INTERNATIONAL BOULEVARD;
THENCE NORTH 20'06'52" EAST, 160.87 FEET TO THAT PORTION CONVEYED TO THE
STATE OF WASHINGTON BY DEED RECORDED UNDER KING COUNTY RECORDING NO.
9603260430;
THENCE SOUTH 69'53'08" EAST, 5.00 FEET ALONG SAID EAST MARGIN;
THENCE NORTH 20'06'52" EAST, 20.00 FEET ALONG SAID EAST MARGIN;
THENCE NORTH 69'55'50" EAST, 2.71 FEET ALONG SAID EAST MARGIN TO SAID SOUTH
MARGIN OF SOUTH 144TH STREET AS CONVEYED TO THE CITY OF TUKWILA BY KING
RECORDING NO. 20150319001438;
THENCE SOUTH 87'35'35" EAST, 161.55 FEET ALONG SAID SOUTH MARGIN;
THENCE SOUTH 02'24'25 WEST, 8.39 FEET ALONG SAID SOUTH MARGIN;
THENCE SOUTH 88'52'26" EAST, 164.98 FEET TO THE TRUE POINT OF BEGINNING.
Exhibit "B"
Stormwater Site Plan
For Tukwila Village
Public Works Permit No. PW14-0141
EXHIBIT B
1=100'
Scale:
Horizontal 1''=100Vertical
18215 72ND AVENUE SOUTH
KENT, WA 98032
(425)251-6222
(425)251-8782 FAX
CIVIL ENGINEERING, LAND
PLANNING, SURVEYING,
ENVIRONMENTAL SERVICES
For' TUKWILA VILLAGE
TIKVYLA INTERNATIONAL ELVD.
AID S 144TH ST.
Job Number
15255
Title'
SITE PLAN
Sheet
1 of
Designed
I Drawn CP
I Checked CP I Approved CP I Date 08-16-18
Exhibit"C=
StornmwvatarPo||mKimn Prevention Plan
For Tukwila Village Phase 1
Public Works Permit No. PW14-0141
Street Address
The street address is 14400 Tukwila International Blvd, Tukwila, VVA08168 [Building []; and 4051 S. 144m
Street, Tukwila International Blvd, Tukwila, WA 98168 [Building E].
Plan Goal
The goal ofthe plan istotreat all on -site runoff for water quality bydirecting flows toomodular wetland and
through a storm detention vault prior to discharge to the public system in South 144th Street.
Preventative BMP's
The catch basins shall have stenciled next to them "DUMP NO WASTE -DRAINS TO STREAM". Activity
that involves pollutants shall be done under a covered area. The private driveways and parking lot shall be
cleaned and swept aenecessary toremove debris.
Inspection and Maintenance Guidelines
Inspect the entire atormvvotersyehem and clean out catch basins at least twice a year, especially after
periods of heavy runoff. The modular wetland system shall be maintained as recommended by the
manufacturer. Maintenance records must be kept for five (5) years and available for City Inspector review.
Asamp|e Inspection / Maintenance Checklist ieattached hereto. Facility -specific maintenance standards
and inspection and maintenance guidelines for the atormwatereyetem and modular wetland system are
also attached hereto.
Person of Responsibility
Name:
Emergency Contact:
Person ofResponsibility, Date:
Engineer Preparing Plan
Name:
Address:
Tukwila Village Development Association, LLC
/4400 Tukwila International Blvd., Suite /00
Tukwila, WA 98168
Phone #253-23Y-50k03
Bryan M. Park, August, 2018
BuqJhaunenConsulting Engineers, Inc.
Y82Y572ndAvenue South
Kent, WA 98032
Plan and/or Information Updates
The City of Tukwila, Public Works Daoertment, Engineering Division, Storm Drainage Sention, 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 ofTukwila, Public Works Department.
INSPECTION / MAINTENANCE CHECKLIST
Structure
Date of Inspection / Maintenance
CB #1 Type 1
Insp. Results
Maint. Done
CB #2 Type 1
Insp. Results
Maint. Done
CB #3 Type 1
Insp. Results
Maint. Done
CB #4 Type 2
Insp. Results
Maint. Done
MW #3
Modular
Wetland
Insp. Results
Maint. Done
Stormwater
Detention
Vault
Insp. Results
Maint. Done
4.6 Maintenance Standards for Drainage Facilities
The facility -specific maintenance standards contained in this section are
intended 0obuconditions for dcteoni i ifmaintenance actions are
required as kkezbOod inspection. They are not intended to be
measures o[the facility's required condition atall times between
inspections. 1uother v/ord*,exouodenoeoFthese oondidonsadany hn�c
betv/ccni ec1iunaund/ormabntcuuuccdoeuoo\uuk,n/odcolh/oouuLhutc
oviolation ofthese standards. However, based upon inspection
observations, the inspection and maintenance schedules shall be a4justed
to minimize the length nfdnoo that u facility is in ucondition that requires
umaintenance action.
No. 3 — Closed Detention Systems (TanksNaults)
Maintenance
Component
oemm
Conditions When Maintenance isNeeded
Results Expected
When Maintenance is
Performed
Storage Area
Plugged Air Vents
One-half ofthe cross section ofavent iu
blocked atany point orthe vent iodamaged.
Vents open and
functioning
Debris and Sediment
Accumulated sediment depth exceeds 1O%
nfthe diameter ofthe storage area for 1/2
length ofstorage vault orany point depth
exceeds 15% of diameter.
(Example: 72'incU storage tank would
require cleaning when sediment reaches
depth nf7inches for more than 1/2length of
tank.)
All sediment and
debris removed from
storage area.
Joints Between
Tank/PipeGection
Any openings orvoids allowing material Vo
be transported into facility.
(Will require engineering analysis to
determine structural staUi|hy).
All joint between
tank/pipe sections
are sealed.
Tank Pipe Bent Out
of Shape
Any part of mais bent out nfshape
more than 1O%ofits design shape. (Review
required byengineer todetermine structural
stability).
Tank/pipe repaired or
replaced mdesign.
Vault Structure
Includes Cracks in
WaU. Bottom,
Damage tFrame
and/or Top Slab
Cracks wider than 1/2inchand any
evidence ofsoil parfideoentering the
structure through the cracks, or
maintenance/inspection personnel
determines that the vault ionot structurally
sound.
Cracks wider than 1/2'inchot the joint nfany
inlet/outlet pipe orany evidence ofsoil
particles entering the vault through the walls.
Vault replaced or
repaired to design
specifications and is
structurally sound.
Nocracks more than
1/4'inckwide at the
joint ofthe inlet/outlet
pipe.
Manhole
Cover Not in Place
Cover is missing or only partially in place.
Any open manhole requires maintenance.
Manhole is closed.
Locking Mechanism
Not Working
Mechanism cannot boopened b o
maintenance person with proper tools. Bolts
into frame have less than 1/2inch ufthread
(may not apply tnself-locking |ids).
Mechanism opens
with proper tools.
Cover Difficult m
Remove
One maintenance cannot remove lid
after applying normal lifting pressure, Intent
istnkeep cover from sealing off access tn
maintenance.
Cover can be
removed and
reinstalled byone
maintenance person,
Ladder Rungs Unsafe
Ladder iounsafe due tomissing rungs,
misa|ignment, not securely attached tn
structure wall, rust, orcracks.
Ladder meets design
standards. Allows
maintenance person
safe access.
Catch Basins
See "Catch Basins"
See "Catch Bmsina" (No. 5)
See "Catch Basins"
No. 4—Control Structure/Flow Restrictor
Maintenance
Component
Defect
Condition When Maintenance isNeeded
Results Expected
When Maintenance
is Performed
General
Trash and Debris
(includes Sediment)
Material exceeds 25.&ofsump depth or1
foot below orifice plate.
Control structure
orifice ianot blocked.
All trash and debris
removed.
Structural Damage
Structure isnot securely attached to
manhole wall.
Structure securely
attached mwall and
outlet pipe.
Structure isnot in upright position (allow up
to1U96from p|umb)
Structure in correct
position.
Connections tooutlet pipe are not watertight
and show signs ofrust.
Connections moutlet
pipe are water tight;
structure repaired or
replaced and works
as designed.
Any ho|ea—otherthan designed ho|oo—inthe
structure.
Structure has no
holes other than
designed holes.
C|eannutGave
Damaged orMissing
C|eannutgate isnot watertight orismissing.
Gate iowatertight
and works en
designed.
Gate cannot bemoved upand down by one
maintenance person.
Gate moves upand
down easily and io
watertight,
Chain/rod leading togate iomissing or
damaged.
Chain isinplace and
works ondesigned.
Gate iarusted over 50%ofits surface area.
Gate iorepaired or
replaced tomeet
design standards.
Orifice Plate
Damaged orMissing
Control device ienot working properly due tn
missing, out ofplace, orbent orifice plate.
Plate isin place and
works oxdesigned.
Obstructions
Any trash, debris, sediment, orvegetation
blocking the plate.
Plate iofree ofall
obstructions and
works aodesigned.
Overflow Pipe
Obstructions
Any trash ordebris blocking (or having the
potential oyb|ocking)the overflow pipe,
Pipe iofree ofall
obstructions and
works asdesigned.
Manhole
See "Closed
Detention Gy�amo^
(Nn.8).
See^C|osedDavanhonOy�ema^<No�3)�
See "Closed
Detention Systems"
(No.3)
Catch Basin
See "Catch Basins"
See "Catch Basins" (No.5).
See "Catch Basins"
No. 5 — Catch Basins
Maintenance
Component
Defect
Conditions When Maintenance ioNeeded
Results Expected When
Maintenance is
performed
General
Traoh&
Debris
Trash ordebris which islocated immediately
infront ofthe catch basin opening nrio
blocking in|ettingcapacity ofthe basin by
more than 10Y6.
NuTrash ordebris located
immediately infront of
catch basin nrnngrate
opening.
Trash urdebris (in the basin) that exceeds OO
percent ofthe sump depth aumeasured from
the bottom nfbasin Voinvert ofthe lowest
pipe into orout ofthe basin, but innocase
less than aminimum ofsix inches clearance
from the debris surface *othe invert ofthe
lowest pipe,
Notrash ordebris inthe
catch basin.
Trash nrdebris inany inlet oroutlet pipe
blocking more than 1/8ofits height.
Inlet and outlet pipesfreo
oftrash ordebris.
Dead animals or vegetation that could
generate odors that could cause complaints
ordangerous gases (o.g. methane).
Nodead animals o,
vegetation present within
the catch basin.
Sediment
Sediment (in the basin) that exceeds 00
percent of the sump depth aomeasured from
the bottom ofbasin tninvert ofthe lowest
pipe into nrout ufthe basin, but innocase
less than aminimum ofOinches clearance
from the sediment surface tothe invert nfthe
lowest pipe.
Nosediment inthe catch
basin
Structure
Damage to
Frame and/or
Top Slab
Top slab has holes larger than 2square
inches nrcracks wider than 1/4inch
(,Intent intomake su�nomaVoha|ismnning
intnbaain).
Top slab iofree ofholes
and cracks.
Frame not sitting flush ontop slab, i.e.,
separation ofmore than 3/4inch nfthe frame
from the top slab. Frame not securely
attached
Frame iositting flush on
the riser rings ortop slab
and firmly attached.
Fractures or
Craoksin
BasinWa||»/
Bottom
Maintenance person judges that structure io
unsound,
Basin replaced orrepaired
todesign standards.
Grout fillet has separated nrcracked wider
than 1/2inch and longer than 1foot at the
joint ofany inlet/outlet pipe o,any evidence of
soil particles entering catch basin through
medm.
Pipe iomgmutedand
secure otbasin wall.
Settlement/
Misalignment
|ffailure nfbasin has created asafety,
func1iun, or design problem.
Basin replaced nrrepaired
to design standards.
Vegetation
Vegetation growing across and blocking more
than 1OY4ofthe basin opening.
Novegetation blocking
opening tobasin.
Vegetation growingininlet/outlet pipe joints
that ismore than six inches tall and less than
Nuvegetation orroot
growth present.
No. 5 —Catch Basins
Maintenance
Component
Defect
Conditions When Maintenance is Needed
Results Expected When
Maintenance is
performed
Contamination
and Pollution
See "Detention Ponds" (No. 1).
Nopollution present.
Catch Basin
Cover
Cover Not in
Place
Cover inmissing only partially in place.
Any open catch basin requires maintenance.
Catch basin cover is
dosed
Locking
Mechanism
Not Working
Mechanism cannot beopened byone
maintenance person with proper tools. Bolts
into frame have less than 1/2inch ofthread.
Mechanism opens with
proper tools.
Cover Difficult
to Remove
One maintenance person cannot remove lid
after applying normal lifting pressure.
(Intent iokeep cover from sealing off access
to maintenance.)
Cover can be removed by
one maintenance person.
Ladder
Ladder Rungs
Unsafe
Ladder is unsafe due to missing rungs, not
securely attached 10basin wall,
misalignment, rust, cracks, nrsharp edges.
Ladder meets design
standards and allows
maintenance person safe
access.
Metal Grates
(If Applicable)
Grate opening
Unsafe
Grate with opening wider than 7/Oinch.
Grate opening meets
design standards.
Trash and
Debris
Trash and debris that isblocking more than
2O%ofgrate surface in|ottingcapacity,
Grate free oftrash and
debris.
Damaged or
Missing,
Grate missing nrbroken member(s)ofthe
grate,
Grate isinplace and
meets design standards.
Modular Wetland System —U ~near
Inspection
Guidelines
U^
n�������U��� °�������n�nes
Inspection Summary
o Inspect Pre -Treatment, Biofiltration and Discharge Chambers - average inspection interval is
8bo 12months.
' (15-nninuteaverage inspection drno).
o NOTE: Pollutant loading varies greatly from site to site and notwo sites are the name.
Therefore, the first year requires inspection monthly during the wet season and every other
month during the dry season in order to observe and record the amount of pollutant loading the
system in receiving.
Inspection
Overview
u����������� »��s����e��
� _
Aswith all ohmrmvvob*rBMPainspection and maintenance onthe MVVSLinear isnecessary.
8tonnvvaterrogu|sdiona require that all BMPy be inspected and maintained to ensure they are
operating as designed to allow for effective pollutant removal and provide protection to receiving
water bodies. It is recommended that inspections be performed multiple times during the first
year to assess the site specific loading conditions. This is recommended because pollutant
loading and pollutant characteristics can vary greatly from site to site. Variables such as nearby
soil erosion or construction sites, winter sanding on roads, amount of daily traffic and land use
can increase pollutant loading on the system. The first year of inspections can be used to set
inspection and maintenance intervals for subsequent years to ensure appropriate maintenance
is provided. Without appropriate maintenance a BMP will exceed its storage capacity which can
negatively affect its continued performance in removing and retaining captured pollutants.
Inspection Equipment
Following is a list of equipment to allow for simple and effective inspection of the MWS Linear:
` Modular Wetland Inspection Form
Flashlight
' Manhole hook orappropriate tools tnremove access hatches and covers
Appropriate traffic control signage and procedures
. Measuring pole and/or tape measure.
` Protective clothing and eye protection.
' 7/16"open orclosed ended wrench.
^ Large permanent black marker (initial inspections only —first year)
' Note: entering confined space requires appropriate safety and certification. Kiagenerally
not required for routine inspections of the system.
Inspection Steps
The core to any successful stormwater BMP maintenance program is routine inspections, The
inspection steps required on the MWS Linear are quick and easy. As mentioned above the first
year should be seen as the maintenance interval establishment phase. During the first year
more frequent inspections should occur in order to gather loading data and maintenance
requirements for that specific site. This information can be used to establish a base for long
term inspection and maintenance interval requirements.
The MWS Linear can be inspected though visual observation without entry into the system. All
necessary pre -inspection steps must be carried out before inspection occurs, especially traffic
control and other safety measures to protect the inspector and near -by pedestrians from any
dangers associated with an open access hatch or manhole. Once these access covers have
been safely opened the inspection process can proceed:
' Prepare the inspection form by writing in the necessary information including project name.
location, date & time, unit number and other info (see inspection forrn>.
' Observe the inside of the system through the access hatches. If minimal light is available and
vision into the unit is impaired utilize oflashlight to see inside the system and all of its
chambers.
' Look for any out of the ordinary obstructions in the inflow pipe, pre-treatment chamber,
biofiltration chamber, discharge chamber or outflow pipe. Write down any observations on the
inspection form.
' Through observation and/or digital photographs estimate the amount of trash, debris and
sediment accumulated in the pre-treatment chamber. Utilizing a tape measure or measuring
stick estimate the amount of trash, debris and sediment in this chamber. Record this depth on
the inspection form.
^ Through visual observation inspect the condition of the pre -filter cartridges. Look for
excessive build-up of sediments on the cartridges, any build-up on the top of the cartridges, or
clogging
of the holes. Record this information on the inspection form. The pre -filter cartridges can
further be inspected by removing the cartridge tops and assessing the color of the
BioMediaGREENDlter cubes (requires entry into pre-treatment chamber—seenCtes above
regarding confined space entry). Record the color of the material. New nnaheha| is a light green
in color. As the media becomes clogged it will turn darker in color, eventually becoming dark
brown or black. Using the below color indicator record the percentage of media exhausted.
' The biofiltration chamber is generally maintenance free due to the system's advanced
pretreatment chamber. For units which have open planters with vegetation it is recommended
that the vegetation be inspected. Look for any plants that are dead or showing signs of disease
or other negative stressors. Record the general health of the plants on the inspection and
indicate through visual observation or digital photographs if trimming of the vegetation is
needed.
` The discharge chamber houses the orifice control structure and is connected to the outflow
pipe. It is important to check to ensure the orifice is in proper operating conditions and free of
any obstructions. Generally, the discharge chamber will be clean and free of debris. Inspect
the water marks on the side walls. If possible, inspect the discharge chamber during e rain
event tnassess the amount of flow leaving the system while itioot1OU%capacity (pretreatment
chamber water level at peak HGL). The water level of the flowing water should be
compared to the watermark level on the side walls which is an indicator of the highest
discharge rate the system achieved when initially installed. Record on the form is there is any
difference inlevel from watermark ininches.
O%—Percent Clogged —1O0Y6New
' NOTE: During the first few storms the water level in the outflow chamber should be
observed and a 6" long horizontal watermark line drawn (using a large permanent marker) at the
water level in the discharge chamber while the system is operating at 100% capacity. This line
is a reference point for future inspections of the system:
' Water level in the discharge chamber is a function of flow rate and pipe size. Observation of
water level during the first few months of operation can be used as a benchmark level for
future inspections. The initial mark and all future observations shall be made when system is
at 100% capacity (water level at maximum level in pre-treatment chamber). If future water
levels are below this mark when system is at 100% capacity this is an indicator that
maintenance tothe pre -filter cartridges may beneeded.
' Finalize inspection report for analysis by the maintenance manager to determine if
maintenance iSrequired.
Using a permanent marker draw a 6 inch - long horizontal line, as shown, at the
higher water level inthe MVVSLinear discharge chamber.
Maintenance Indicators
Based upon observations made during inspection, maintenance of the system may be required
based onthe following indicators:
Missing ordamaged internal components orcartridges.
Obstructions in the system orits inlet oroutlet.
Excessive accumulation of floatables in the pre-treatment chamber in which the length and
width ofthe chamber isfully impacted more than 18^
' Excessive accumulation of sediment in the pre-treatment chamber of more than 6" in depth.
' Excessive accumulation of sediment on the BioMediaGREEN media housed within the
prefilter cartridges. The following chart shows photos of the condition of the BioMediaGREEN
contained within the pre -filter cartridges. When media iamore than 85% clogged replacement
is required.
' Overgrown vegetation.
' Water level in discharge chamber during 100Y6 operating capacity /pre-heatmentchamber
water level otmax height) iolower than the watermark by28Y6.
Inspection Notes
1. Following maintenance and/or inspection, it is recommended the maintenance operator
prepare a maintenance/inspection record. The record should include any maintenance
activities performed, amount and description of debris collected, and condition of the
system and its various filter mechanisms.
2. The owner should keep maintenance/inspection record(s) for a minimum of five years from
the date of maintenance. These records should be made available to the governing
municipality for inspection upon request atany time.
3. Transport all debris, trash, organics and sediments to approved facility for disposal in
accordance with local and state requirements.
4. Entry into chambers may require confined space training based on state and local
regulations.
5. Nofertilizer shall be used in the Biofi|trmtion Chamber.
6. Irrigation should be provided as recommended by manufacturer and/or landscape
architect. Amount Vfirrigation required iodependent onplant species. Some plants may
not require irrigation after initial establishment.
Modular K Wetland System Linear
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Maintenance Guidelines
Maintenance Summary
o Remove Sediment from Pre -Treatment Chamber - average maintenance interval is 12 to 24
months.
. (10-nninute average service time).
o Replace Pre -Filter Cartridge Media - average maintenance interval 12 to 24 months.
' (10-15minute per cartridge average service time).
o Trim Vegetation - average maintenance interval isOho12months.
. (Service time varies).
Maintenance
�� Overview
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The time has come tomaintain your Modular Wetland System Linear /K4VVSLineoh.Toensure
successful and efficient maintenance on the system we recommend the following. The MWS
Linear can be maintained by removing the access hatches over the systems various chambers.
All necessary pre -maintenance steps must be carried out before maintenance occurs, especially
traffic control and other safety measures to protect the inspector and near -by pedestrians from
any dangers associated with an open access hatch or manhole. Once traffic control has been
set upper local and state regulations and access covers have been safely opened the
maintenance process can begin. It should be noted that some maintenance activities require
confined space entry. All confined space requirements must be strictly followed before entry into
the system. |naddition, the following is recommended:
' Prepare the maintenance form by writing in the necessary information including project
name. location, date &Urna. unit number and other info (see maintenance form).
` Sot up all appropriate safety and cleaning equipment.
^ Ensure traffic control is set upand properly positioned.
' Prepare apre-checks /{)SHA.safety, confined space entry) are performed.
Maintenance Equipment
Following in a list of equipment required for maintenance of the K4VVS Linear:
Modular Wetland Maintenance Form
Manhole hook orappropriate tools bzaccess hatches and covers
' Protective clothing, flashlight and eye protection.
' 7/16"open Orclosed ended wrench.
Vacuum assisted truck with pressure washer.
Replacement BioKAediaGREEN for Pre'Fi|terCartridges if required (order from
manufacturer).
Maintenance Steps
1. Pre-treatment Chamber (bottom ofchamber)
A. Remove access hatch or manhole cover over pre-treatment chamber and position vacuum
trunk accordingly.
B. With a pressure washer spray down pollutants accumulated on walls and pre -filter
cartridges.
C. Vacuum out Pre -Treatment Chamber and remove all accumulated pollutants including
trash, debris and sediments. Be sure to vacuum the floor until pervious pavers are visible
and clean.
U. |fPre-Filter Cartridges require media replacement move onto step 3. If not, replace access
hatch nrmanhole cover.
Removal ofaccess hatch bogain access below. Insertion ofvacuum hose into separation
chamber.
Removal of trash, sediment and debris. Fully cleaned separation chamber.
2.Pre-Filter Cartridges (attached hzwall nfpre-treatment chamber)
A. After finishing step 1 enter pre-treatment chamber.
B. Unscrew the two bolts holding the lid on each cartridge filter and remove lid.
C. Place the vacuum hose over each individual media filter to suck out filter media.
D. Once filter media has been sucked use a pressure washer to spray down inside of the
cartridge and it's containing media cages. Remove cleaned media cages and place tothe
side. Once removed the vacuum hose can be inserted into the cartridge to vacuum out any
remaining material near the bottom ofthe cartridge.
OMM[h'IA! .t
Inspection Report
Modular Wetlands System
`7Jro
E 11.AND5
Project Name
Project Address
Owner / Management Company
(aty) (Ze Code)
Contact
Inspector Name
Type of Inspection ❑ Routine 0 Follow Up 0 Complaint
Weather Condition
Phone
Date
0 Storm
Additional Notes
Time
For Office Use Only
(Reviewed By)
(Date)
Office personnel to complete section to
the left
AM / PM
Storm Event in Last 72-hours? ❑ No 0 Yes
Inspection Checklist
Modular Wetland System Type (Curb, Grate or UG Vault): Size (22', 14' or etc.):
Structural Integrity:
Yes
No
Comments
Damage to pre-treatment access cover (manhole cover/grate) or cannot be opened using normal lifting
pressure?
Damage to discharge chamber access cover (manhole cover/grate) or cannot be opened using normal lifting
pressure?
Does the MWS unit show signs of structural deterioration (cracks in the wall, damage to frame)?
Is the inlet/outlet pipe or drain down pipe damaged or otherwise not functioning properly?
Working Condition:
Is there evidence of illicit discharge or excessive oil, grease, or other automobile fluids entering and clogging thf
unit?
Is there standing water in inappropriate areas after a dry period?
Is the filter insert (if applicable) at capacity and/or is there an accumulation of debris/trash on the shelf system?
Does the depth of sediment/trastVdebris suggest a blockage of the inflow pipe, bypass or cartridge filter? If yes
specify which one in the comments section. Note depth of accumulation in in pre-treatment chamber.
Depth,
Does the cartridge filter media need replacement in pre-treatment chamber and/or discharge chamber?
Chamber:
Any signs of improper functioning in the discharge chamber? Note issues in comments section.
Other Inspection Items:
Is there an accumulation of sediment/trash/debris in the wetland media (if applicable)?
Is it evident that the plants are alive and healthy (if applicable)? Please note Plant Information below.
Is there a septic or foul odor corning from inside the system?
Waste:
Yes
No
Recommended Maintenance
Plant Information
Sediment / Silt / Clay
No Cleaning Needed
Damage to Plants
Trash / Bags / Bottles
Schedule Maintenance as Planned
Plant Replacement
Green Waste / Leaves / Foliage
Needs Immediate Maintenance
Plant Trimming
Additional Notes:
2972 San Luis Rey Road, Oceanside, CA 92058 P (760) 433-7640 F (760) 433-3176
Weather Condition
ENVISIONASENTAS SERVICES, INC.
Cleaning and Maintenance Report
Modular Wetlands System
V'EfL'AhiA
Project Name
Project Address
Owner / Management Company
Contact
(.1),) (Zip CdO)
Inspector Name
Phone (
Date Time
For Office Use Only
(Reviewed By)
(Uate)
Office personnel to complete section to
the left,
AM / PM
Type of Inspection El Routine 0 Follow Up 0 Complaint CI Storm Storm Event in Last 72-hours? El No 0 Yes
Additional Notes
Site
Map #
GPS Coordinates
of Insert
Manufacturer /
Description / Sizing
Trash
Accumulation
Foliage
Accumulation
Sediment
Accumulation
Total Debris
Accumulation
Condition of Media
25/50775)100
(wit be changed
75%)
Operational Per
Manufactures'
Specifications
(If not, why?)
Long:
MWS
Catch Basins
MWS
Sedimentation
Basin
Media Filter
Condition
Plant Condition
Drain Down Media
Condition
Discharge Chamber
Condition
Drain Down Pipe
Condition
Inlet and Outlet
Pipe Condition
Comments:
2972 San Luis Rey Road, Oceanside, CA 92058 P. 760.433.7640 F. 760.433.3176