Agreement to Maintain Stormwater Facilities 001y of Yelm
ni Merriman
Box 479
m, WA 98597
Document title(s) (or transactions contained therein):
1. Agreement to Maintain Stortnwater Facilities
Reference Number(s) of Documents assigned or released:
(on page of documents(s))
Grantor(s) (Last name, first name, middle initial)
1. Yelm Community Schools
Grantee(s) (Last name, first name, middle initial)
1. City of Yelm
2.
Legal Description (abbreviated: i.e. lot, block, plat or section, township, range)
That part of the north half of the northwest quarter of Section 24, Township 17 North, Range 1
East, W.M., lying southwesterly of Secondary State Highway No. 5-1; EXCEPTING
therefrom the east 20 feet and the north 430 feet of the portion lying in the northeast quarter of
said northwest quarter and excepting the west 906.6 feet of [he northwest quarter of said
northwest quarter and excepting also the north 30 feet for county mad known as Rathbun
Road.
Assessors Property Tax ParceUAccount Number:
21724210500
3965846 Page 1 0( 21
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COMMEI2CIALANDUSTI2IAL
AGREE31ENT TO MAINTAIN
STORMW'ATEI2 FACILITIES AND TO IMPLEMENT A
POLLUTION SOURCE CONTROL PLAN
BY AND BETWEEN
YELM COMMUNITY SCHOOLS
ITS HEI12S, SUCCESSORS, OR ASSIGNS
(HEREINAFTER "OWNER")
AND CITY OF YELM
QIEREINAFTER "JURISDICTION")
The upkeep and maintenance of stormwater lacilities and the implementation of pollution
source control best manaeement practices (BMPs) is essential to the protection of water
resources. All property owners are expected to conduct business in a manner that
promotes envimnmenlal protcetiun. ibis Agreement cumaim specific provisions with
respect m maintenance of stormwater lacilities and use ofpollution source control BMPs.
LEGAL UESCKI P"fU)N:
YELM HIGH SCHOOL
Parcel number 21724210~OQ in die City of Yclm.
Whereas, OWNER has constructed improvements, including but not limited to, buildings,
pavement, utilities and stormwater facilities on the property described above. In order to
further the goals of the .IURISDICTION and to ensure the protection and enhancement of
wafer resources. the JURISDIC"fIOK and OWNER hereby enter into this Agreement.
l~he responsibilities of each party to this Agreement arc identified below.
OWNER SHALL:
(I) Implement die stormwater facility maintenance program included herein as
Attachment "A"
(2) Implement the pollution source control program included herein as Attachment
..8..
(3) Maintain a record (in the form of a log book) of seeps token to implement die
programs referenced in (I) and (2) above. the log book shall be available for
inspection by Jurisdiction stall~at-101 Coates Arc. N W during normal business
hours. The log book shall catalog the action taken, who took it, when it was done,
how it was done, and any problems encountered or follow-on actions
recommended. Maintenance items ("problems") listed in Attachment "A" shall be
inspected on a monthly or more frequent basis as necessary. OWNER is
encouraged to photocopy the individual checklists in Attachment "A" and use
3965846 Page 2 of 21
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them to complete its inspections. 'Chew completed checklists would then, in
combination, comprise the monthly log book.
(4) Submit un annual report [o the JURISDICTION regarding implementation of the
programs referenced in (I) and (2) above. The report must be submitted on or
before May I S of each calendar year end shall contain, at a minimum, the
following:
(a) Namc, address and tdcphone number of the businesses, the persons, or [he
firms responsible for plan implementa[ioq and [he person completing the
report.
(b) Time period covered by the report.
(c) A chronological summary of ^eti vitics conducted to implement the programs
referenced in (1) and (2) above. A photocopy of the applicable sections of the log
book, with any additional explanation needed, shall normally since. For any
activities conducted by paid parties nol afllliated with OWNER, include a copy of
the invoice for services.
(d) An outline of planned activities for the next year.
THE JURISDICTION SHALL:
(1) Provide technical assistance to U WN6R in support of its operation and
maintenance activities conducted pursuant to its maintenance and source control
programs- Snid :usistanec shall be provided upon reyucst, and as Jurisdiction
time and rosourcrs permit, at no charge to OWNh: R.
(2) Nevicw the anuuul report and conduct a miuinuun of one (I) site visit per year to
discuss performance and problems with OWNIiR.
(3) Review this agreement with OU%M?R and modify it as necessary at least once
every three (3) years.
REMEDIES:
(I) II the JURISDfC"CIOTy determines that maintenance or repair work is required to
be done m the stormwater facilities existing on OWNE2, property, the
JURISDICTION shall give the owner of die property within which the drainage
facility is located, and the person or agent in control of said property, notice of the
specific maintenance and/or repair required. The JURISDICTION shall set a
reasonable time in which such work is to be completed by the persons who were
given notice. If the above required maintenance and/or repair is not completed
within the time set by the JURISDIC"IION, written notice will be sent to the
persons who were given no~icc swung the .IURISDIC~I'ION'S intention to perform
3965696 Page 3 of 21
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such maintenance and bill the owner for all incurred expenses. The Jurisdiction
may also revoke storm ~+ater rnilily rate credits fbr the quality component or
invoke surcharges to the quantity compmienl of OI~~KER bill if reyuired
maintenance is not performed.
(2) Il at any time the JURISDIC"PION determines that the existing system creates any
imminent threat to public health or wet fai c, the .IURISDICTION may take
immediate measures to remedy said threat. No notice to the persons listed in
Remedies (I), above, shall be required under such circumstances.
(3) "Che owner grants unrestricted authority to the .IUIZISDICTION for access to any
and all stonmwater system features for the purpose of performing maintenance or
repair as may become necessary under Remedies land/or 2.
(4) The persons listed in (I), above, shall assume all responsibility foe the cost of any
maintenance and for repairs to the stormwater facility. Such responsibility shall
include reimbursement to dte JURISDICTION within 30 days of the receipt of the
invoice for any such work performed. Overdue payments will require payment of
interest at die current legal rate Im- liquidated judgments. Lf legal action ensues,
any cost or ices incured by the J URISDICf ION will be borne by [he parties
responsible for said rcimburscnunle.
(~) The owner hereby grams to the JIIiISDICfION ,i lien against the above-
described property in an amount equal to the cost incurred by the
JURISDICTION to perlm~m the maintenance or repair work described herein.
3965846 Page 4 of 2l
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This Agreement is intended ro protect the value and desirability of the real property described
above end m benefit all [he citizens of [hc Jurisdiction. It shall run with the land and be binding
on all parties having or acquiring from OWNER or their successors any rights, title, or interest in
the propeiYy or any part [hereof, as well as their title, or interest in the property or any part
thereof, as well as [heir heirs, successors, and assigns. They shall inure to the benefit of each
present or future successor in interest of said properq~ or a,~.v part thereof, or interest [herein, and
rothe bcneftofall citizens ofthe JURISDICTION. /~/~w~
Alan Burke, Superintendent
Ychn comnniniic Schools
STA'19%OF WASHINGTON )
)SS
COUNTY OF TH URSTON )
Ou this day and vcur pcnunall~' appeared belore me. JtL~1~1 hjy(,1°(~~ end
Icnu~~ n io be the udividu;J(s) described, and who executed
t6c lomgoing insrnmicnr and acknowledne the said Instrument to be the free and voluntary act
and deed for the uses' and purposes therein mentioned. ~,~~
Given under my hand and olllcial seal this day of /ctµ L00~
~} ~_~~
~s~ A~--~ bta- ublic in and for the State of
Washington, residing in A~P ~YYI
S!1 ~`~`~
Dated at =,~Cw~ , Washingon, ibis' ~'L. day of Cat ~`I~A,A, 200=7.
S'PA'hE OF WASHINGTON )
)SS
COUNTY OF THURSTON )
On this day and year personally appealed before ine, ~ V-~~,~ ~ ~<~~c , ~, i;s~
who csccuted the foreeoine instrument and acknowled Ke the
said insh~umem m be the Irce and voluntary act and deed of~su id Municipal Corporation for the
uses and purposes therein mentioned and on oatl~ states he is authorized m execute the said
in stru menl.
Given under my hand and ulllclal seal This 'y~A ~ day ol'~~~jt ~ , 200.
r L, , „Y.
No(ar}'-Publidin u d for the State of
Washington, rosli ing_~T~~{~\Yfs ~ C ;
AYYROVED AS TO FORM
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INSTRUCTIONS FOR PERSON MAINTAINING
STORM WATER SYSTEM
"fhc following pages describe the maintcnancc needs of the stonnwatcr conveyance,
storage and disposal components of the systan designed liy this silt. This maintenance
effort shall be the responsibility of the YflLM CONI YIUNfFU SCHOOLS or its assigned
representative. In general, system components should he inspected in accordance with
the Maintenance Checklists included as Attachment "A- at the rear of this document.
Use the suggested frequency indicated on the Icft side of the Checklist Forms:
Q) Moodily (\7) tram November through April
(2) Annually (A), once in late summer (preferably September)
(3) Alter major storm events (Syl inch in 24 hours.
Inspection findings should be recorded on photocopies of Maintenance Checklist Forms.
CheckolF the problems you looked for each time an inspection was performed.
Maintenance should be undertaken to correct detieieneies found and comments on
problems Cound and actions taken entered on the forms.
Completed Checklist Forms should be filed and incorporated in the annual report to be
issued in May of each year.
If you hove specif is yuesriun9 or rcyuire technical assistance. contact the responsible
jurisdiction. Please do not hesitate to call, especially i( you are unsure whether a
situation you have discovered may be a problem.
3965846 Page 6 of 21
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COVCR Sf1EET
inspection Period:
Number of Sheets Attached:
Dale Inspected:
Name o(Inspector:
Inspector's Signature:
3965846 Page 7 of 21
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Comments:
Kam:
A=Annual (March or April preferred)
M=Monthly (see schedule)
S=ARer major stones (use 1-inch in 24 hours as a guideline)
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ATTACHMENT"A"
MAINTENANCE PROGRAM
Maintenance Checklist for Closed Detention Systems (Pipes/Tanks)
Frequenry Drzinage / Problem Conditions TO Conditions Tha[Shall exist
Systems v Check Por
Feature
M Stodge Pluggee air One~half o(Ne entl area of a vent is Vents free of debris antl
area (pipe vents (small bbtketl at any point with tlebns antl setliment
tank) pipe Nat sedunent. Plugged vent ran cause
connects aVh stooge area to collapse.
basin to
storage pipe)
M Debris and Accumulated setliment tlepth All setliment antl tlebns
setliment ezoxtls l5%of diameter. removetl hom storage area.
Example: ]2-inch storage tank Contact the Count' for
would require cleaning when quitlanre on sedunent
seSment reaches tl_DM of 1D moral antl disposal.
incJfes
p Joints between Any erect allowing material to leak Ali joints Oetween tank pipe
tank pipe inm htlliry. seCipns ar_ sealed.
section
A Tank pipe bent Any Dad of (anWpipe is noticeably TanWpilae repairetl or
out of shape bent om of shape. replacetl fo design. Contact a
Orofessional engineer for
evaluation.
M,5 Manhole Cover not In Cover is missing or ony padially in Manhole is dDSetl.
place place. AnY open manhole requires
maimenance.
A Locking Mechanls not be openetl by Mechanism opens with proper
mechanism not one maintenance person wdh tools.
working proper tools. Bolts Into frame have
less than 12-inch of Thread (may
npt appty tp self-locking lids).
A Cover tl~cuh One maintenance person cannot Cover can Ce remwetl antl
to remove remove lid after apprying BO pounds reinstalletl by one
of lift. Intent is to keep coverfrom maintenance person.
sealing off access to maintenance.
A Ladder mugs Mainlena ~¢perspn judges that
n Latltler meets tlezign
unsafe ladtleris
nsafe due to missing stantlartls antl allows
vngs, misalignment mst, or cracks. maintenance persons sate
Laetler must be fixetl or secured access.
manetliately.
If you a.=_ ursure ~ehether a problem exsis, please contact a Pr`essicnal Engineer.
Comments:
A =Annual (March or April preferred)
M =Monthly (see schedule)
S =After major storms (use 1-inch in 24 hours as a guideline)
J-19
3965846 Page 9 of 21
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ATTACHMENT "A" (CONTINUED)
Maintenance Checklist for Catch Basins and Inlets
Frequenry Drainage / Problem Contleions TO Dherk FOr ContlRions That Shoultl Fxist
System V
Feature
M,a General Trash, tlebris, TasA or tleDris in front of Ne catch No trazh wdebds lowtetl
and setliment basin opening is bloUing rapacity immetliatNy in hoot of wkh
or on basin by more man 10 % basin opening. Gate is kept
clean and allows wafer to
enter.
M Sediment or debris (in [he basin) No setliment w debris in the
mat exreetls 1/3 the tlepth hom Ne otch basin. CatU basin is
bonom of basin to invert of the dug out and Gean.
lowest pipe into or out of the basin.
M,5 Tash or debris in any inletwpipe Inlet antl oanetppes free of
bloGing more Nan 113 of Rs height trash or debris.
M Structural Comer of frame exlentls more than Frame Is even wflh wrb.
Damage to 3/4 incA past wrD face into ore
name andlor street (tl applicable).
top slab
M Tap slab bas notes larger [Ilan 2 Top slab is frce of holes antl
square inches or cracks witler than watlcs.
1/4 inpn (intent is to make sure all
material is mooing into the basin).
M Fame not sming Flush on top slag Frame is sMing Push on top
e., separation of more Nan 310 slab
inch of Ne frame from me top slab.
A CraQS in basin CaGa witler Nan 121nch antl Basin replaced or repaired to
wallsroonom longer Nan 3 fee[, any evidence of design stantlaNS. CpntaG a
soil padides entering catch basin professional engineer for
though tacks, or maintenance evaluation.
person judges that stmGUre is
unsountl.
A Cradrs witlerthan l2 inch antl No caGCa more man l/4 inch
longer Nanifoot at the joint of any witle at Ne pint of inleVONlet
inleVOUllef pipe or any evidence of pipe. ContaGaprofessienal
soil paNdes entering catch basin engineer for evaluation.
through tacks.
A aenlemenV Basin naz se[tletl more than 1 inch Basin replacetl or repairetl to
misalignment or has rotated more than 2inches design stantlaNS. (.DntaRa
out of alignment Dro(essioaal engineer for
evaluation.
M,5 Fire hazaN or Presence of chemicals such as No wlor, odor, or sluege.
other pollNion natural gas, oil, and gasofne. Basin is eug out antl clean.
Obnoxious color, oeor, or slutlge
notetl.
M,B Ou[lel pipe is Vegetation or roofs growing in No vegeNticn or root growth
clogged with inleVOUllel pipe loin6:hat iz more present
vegetation than six Inches tall antl less Nan six
inGres apart.
If you are unsure whether a problem exists, please contact a Professional Engineer.
1-21
3965846 Page 10 of 21
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ATTACHMENT "A" (CONTINUED)
Maintenance Checklist for Infiltration Systems
Frequency Drainage Problem ContlOions to Check For Conditions That Should Exist
System ~
Feature
M,S General Tresh 8 tlebris See Maintenance Ch_cklist for See Maintenance Checklist
builtlup in pond Ponds. for Ponds.
M Poisonous See Maintenance Checklist for See Maintenance Checklist
vegetaGOn Ponds. for Ponds.
M 5 Fire hazaN or See Maintenance Checklist for See Maintenance CheUlist
pollution Ponds. for Ponds.
M Vegetation not See Maintenance CAecklist for See Maintenance Checklist
growing oru Pontls. for Ponds.
overgrown
M RWent holes See Maintenance Checklist for See Maintenance Checklist
Ponds. for PoMS.
M insects See Maintenance Checklist for See Maintenance Checklist
Ponds. for PoMS.
A Storage Setliment A soil texture test intlinles facility is Sediment is removetl anNOr
a builtlup in not workirg at its tlesignetl facility is cleaned so that
system npabilities or was inwrredly infitlratbn system works
desgned. accoNing to tlesgn. A
setlimeM Yapping area is
inslalletl to retluce sediment
transport into infitation area.
A storage area Asoil texture test indintes facility is Additional volume is atldetl
drains slowly not working at its tlesignetl through exnvation to provide
(marethan 48 npabilAiesor was incerrec[ly neetletl storzge. Soil is
hoers)or tlesignetl. aerated and rototilletl to
overflows improve tlrainage. ContaG
the County br information on
its requiremen6 regartling
vation.
M sediment Any s_tllnw_nt antl tlehris filling area Clean out sump tc design
trapping area to 10%ot tlepth YOm sump bottom depth.
tp bottom of outlet pice or
obsWCfing Flaw into the connector
pipe,
one Time Setliment Slommvater enters infiltration area Atle a trapping area by
Yapping area tllrecny whhout treaanent. constmaingasump for
not present settling of solitls. Segregate
senling area hom rest of
fatlidy. Contact me emnry
for guidance.
M Rock filters Setliment antl By viwal inspegion lktle or no water Replace gravel in rock flier.
tlebris Bows Through filter during heavy rain
storms.
If you are unsure whether a problem exists, please contact a Professional Engineer.
J-25
3965846 Pa a 11 of 21
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ATTACHMENT"A"(CONTINUED)
Maintenance Checklist for Energy Dissipators
Frequenry Drainage / Problem GontlilLOns to Check FOr Contlnions That Should Exin
System V
Feature
A Rork pad Missing or Only one layer of rock exists above Replaw rocks to design
moved rod native soil in area 5 spuare feet or s[antlam.
larger, or any exposure of native
soil
A Rock-flUed Missing or Trench is not full of md, gtld large rod (+or-301b.
trench for movetl and each) so Nat rock is visible
tlischarye above edge of Vench.
from pontl
M Dispersion Pipe plugged A¢umulaletl sediment that exceeds Pipe cLeane]MUShed.
trench with sediment 20%of the design tlepN.
M Pertorations Over 12 of pertomtions in pipe are Clean or replace pertoated
pluggetl plugged with debris and sediment. pipe.
M,5 Not tlischarying Ysual evitlenrc o/water Trench must be redesignetl or
water property discharging a1 mmm~trated points rebuilt to sandard. Elevation
along Vench (normal condition is a of lip oRrench should be the
"sheetflow"of water along tren:L), same (flan at all ppin6.
Intent a to prevent erosion tlamage.
M,a Walerflows out Maintenance person observes Facility mus[be rebuiX Or
top of wa[erflowing out tludng any strum redesigned [o standaMS.
'dishibuto~ less Nan the design slorn or it is Pipe is Drobably pluggetl or
vetch basin causing or appears likely to cause tlamagetl and needs
tlamage, replacement.
M$ Rec wing area Water in receiving area is rousing Stabilize slope wiN grass or
erzalurated or has potential of ousinq other vegetation, ormd if
Landslide. mntlition is sew_re. DontdG a
professional engineer for
evaluation.
If you are unsure whether a problem exists, please contact a Professional Engineer.
Comments:
KKK:
A=Annual (March or April preferred)
M=Monthly (see schedule)
S=After major storms (use 1-inch in 24 hours as a guideline)
J-27
3965846 Page 12 of 21
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ATTACHMENT"A"(CONTINUED)
Maintenance Checklist for Fencing/Shrubbery ScreeNOther Lantlscaping
Frequency Drainage Problem Contlifions to Check FOr Cortddipns That Shoultl Ezat
System ~
Feature
M Geneal Missing or Any tlefed in the fence or screen Fence is mentletl Or sM1mbs
broken that permRS easy enby to afadliry. replacedto fopna solid
parts/deatl barrier to entry.
shmbbery
M,S Erosion Erosion has resuhetl in an opening Replace soil under fence so
uMerafena that allows entry by that no opening exceeds4
people or pets. inches in height.
M Unruly Shrubbery Is growing out of control Shrvhbery is trimmetl and
vegetation or is infested whh weeds. weetletl tD provbe appealing
aesthetic. Do not use
chemicals to control weeds.
q Wre Damaged pads PosLS OUt of plumb more lhan6 Posts plumb to wiNin l-t2
Fences nches. inches of plumb.
q Top rails bent more than6inches. Top rail free of bends greater
than t into.
q Any Dad of fence ('mtluding pasts, F_nce is aligned antl meets
top rails, antl fabdc(more thanl tlesign stantlaMS.
foot ovt or design alignment.
q Missing or loose tension wire. Tension wire in place and
holtling fabric.
q Missing or loose barbetl wire that is Barbetl wire in place witM1 kss
sagging more tM1an 2-12 inches than 3/4inch sag beMeen
Oetwe_n posts. posts.
q ENension arm missing, broken, or E#ension ann in place wXb
bent oW O(shape more than l-12 no bentls laryer than 3Po inch.
inches.
q Detedpratetl Pad ar parts that have a rustin3 or SlmRurally adequate posts or
paint or sealing mntlilion that has affette0 parts with a unrform prolettive
pmfetlive stnrttural atlequary. mating.
coating
M Openings in Openings in fabric are such that an No openings in fabric
fabric 8-inU tliameter ball could ftl
Through.
If you are unsure whether a problem exists, please contact a Professional Engineer.
Comments:
A=Annual (March or April preferred)
M=Monthly (see schedule)
S=AHer major storms (use 1-inch in 24 hours as a guideline)
J-28
3965846 Page 13 of 21
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ATTACHMENT "A" (CONTINUED)
Maintenance Checklist for Gates
Frequency Drainage / Problem Contlitions to Ched FOr Conditions That Should Fs¢t
System V
Feature
M General Damagetl or Gale Is broken, jammed, or missing. Pontl has a PoncGOning gate
missing to allow entry of people antl
romp"neMS maintenanm equipment such
as mowers antl backhce. If a
lock is used, make sure the
County field s:aR pave a key.
M Broken or missing hinges suMi Thal Hinges intaG arq tubed. Gate
gate cannot be easily openetl antl is working (reey.
dosed by a maintenance person.
q Gale is out of plumb more than fi Gate a aligned antl vertical.
Indies antl more than 1 foot out of
tlesign alignment
q Messing stretcher bantls, antl lies. Stretcher bar, bands, and ties
in place.
If you are unsure whether a prohlem exists, please contact a Professional Engineer.
Comments:
K?1
A=Annual (March or April preferred)
M=Monthly (see schedule)
S=After major storms (use 1-inch in 24 hours as a guideline)
J-29
3965846 Page 14 of 21
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ATTACHMENT "A" (CONTINUED)
Maintenance Checklist for Conveyance Systems (Pipes, Ditches, and Swales)
Frepuency Dainage Problem Gentlitions to CheLC Fer ContlRions That Should Fxist
System ~
Feature
M,S Pipes Setliment6 Arumulaletl sediment that exceeds Pipe cleaned of all sediment
debris 20%of the tliameter of the pipe. and tlebris.
M Vegetation Vegetation Iha[ retluces hee All vegetation removed so
movement of water thrcugh pipes. water flows Feely through
pipes.
p Damaged Protective waling is damagetl; rust Frye repaired or mplacetl.
(rusted, bent, is causing more Nan 50%
orcvshed) detedoation to any pad of pipe.
M Any dent Nat signfianty impedes Pipe repaired Or repla d.
Row (i.e., tlecreases Ne cross
seGion area of pipe by more than
20:6).
M Pipe has malpr racks or tears Pipe repaired or repWced.
allowing grouMwater leakage.
M,S Open Trash 8 tlebris Dumping of yaN wastes such as Remove trzsh antl debris antl
tlilchez Sass tlippings and hanches into tlispose as presrn3ed by Rw_
basin, Dnsightty aaumulagon of Gounry.
nontlegadable materials suet as
glass, plastic, metal, foam, antl
tta@tl paper.
M Sediment Accumulatetl setlimenl that exceeds Ditch deanetl of all sediment
builtlup 20%of the tlesign depth. antl tlebris so Naldmatches
tlesign.
p Vegetation Vegetation (e.g., weedy shrvbs or Waterflows freely Nrough
saplings)Nat retluws hue tlilches. Grassy vegetation
movements of wafer through should be Left alone.
tltlches.
M Erosion See POntls Che:kllsl_ See Ppntls Checklist.
tlamage to
slopes
p Rock lining out Maintenance person an see native Replace rocks to tlesign
of place or soil beneath the and lining. stantlard.
missing (d -
apPliwblej
Vadcz Catch See Catch Basins Checklrst. See Camh Basins Checklist.
basins
M,S Swales Tash&tlebris See above for DilLtes. See above for Ditches.
M Sediment See above for Dikhes. Vegetation may need to be
buildup replanletl after Leaning.
1-i0
396589fi Page 15 of 21
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Freguency Drainage ~ Problem Gontlilions to Check FOr Contltlions TTat Shoultl Exist
sysrem
Feature
M Vegetation not Gress cover Is sparse and seedy or Aerate sols antl reseeO antl
growing ar areas are overgrown with woody mulCi bare areas. Maintain
overgrown vegetalicn. grass height at a minimum of
6 inches for Eest stomnvater
veabnenl. Remove wootly
growN, remntour, antl reseed
as nernssary.
M,S Erosion See Ppntls Checklist See Peatla Chedlist.
damage to
slopes
M Conversion by Swale has been filetl in er blocked If possible, speak with
homeownerto by shed, woodpile, shmbbery, etc. homeowner and reques[[hat
incompalLle swak area be restoretl.
e Contap the Cpunty tc repod
problem it not rectified
voluntarily.
A Swale tlces not Water atantls in swak or tbw A survey may be needetl to
tlrain velodry is very slow. Stagnation check gratles. Grades neetl
occurs. to be in 1-6 % renge rf
possible. If gentle is less than
1% untlekreins may neetl to
be inaialletl.
If you are unsure whether a problem exists, pleasecontact a Professional Engineer.
Comments:
K~r
A=Annual (March or April preferred)
M=Monthly (see schedule)
S=After major storms (use 1-inch in 24 hours as a guideline)
J-31
3965846 Page 16 of 21
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ATTACHMENT "A" (CONTINUED)
Maintenance Checklist for Grounds (Landscaping)
Frequenry Drainage Problem Dontlitions to Check FOr GontlRions That Shoultl Exist
System ~
Feature
M General Weetls Weeds growing in more than 20% Weetls present in less than
(nonpoisonous) pf tM lantlzapetl area (trees and 5%or the lantlsraped area.
shmbs only).
M Insect hazaN Any presence of poison ivy or oNer No poisonous vegetadon or
poisonous vegelafian or inv_q insect nests present in
nests. lansraped area.
M,5 Trash pr litter See Ponds Checklist See Pontlz Checklist.
M,5 Erosion of No[ireable rills are seen in Causes of erosion are
Grountl landscaped areas. itlentifietl antl steps taken to
Sudace slaw dowNSpread out the
wale[ ErodeO areas are
filled rgnlomed, and sretletl.
A Trees and Damage Limbs or parts of trees or shmbs Trim Veestshmbs to restore
shrubs That are split or Cmken whiU aRetl shape. Replace bees/shmbs
more than 25%of the total foliage of wdh severe damage.
the bre or shmb.
M Trees or shrubs [hat have been Redant trm, inspeGing for
blown down or knocked over. injury m stem or roots.
Replace g severely tlamaged.
q Trres ar shrubs whitlr are not Place stakes antl rubber-
. adequately suppodetl or are leaning matetl ties around ycung
over, causing exposure of the mots. tyres/shmbs for support
If you are unsure whether a problem exists, please contact a Professional Engineer.
Comments:
~!-'
A=Annual (March or April preferred)
M=Monthly (see schedule)
S=After major storms (use 1-inch in 24 hours as a guideline)
J-32
3965846 Page 17 of 21
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VORTECHSr"' STORMWATER TREATMENT SYSTEM
MAINTENANCE
The Vortechs System should be inspected at regular intervals and maintained when necessary
to ensure optimum pertormanca. 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 pertortned. 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 [he appropriate time. Inspections should he performed more often in the
winter months in climates where sanding operations may lead to rapid accumulations, or in
equipment washdown areas. If is very useful to keep a record of each inspection. A simple form
for tloing so is provided.
The Vortechs System should be cleaned when inspection reveals that the sediment tlep[h has
accumulated to within siz 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 fhe two measurements is six inches or less. Note: to avoid untlerestima[ing the
volume of sediment in the chamber, the measuring device must be lowered fo the top of the
sediment pile carefully. Finer, silty particles at the top of [he pile typically offer less resistance to
the end of the rod than larger particles toward the bottom of the pile.
Cleaning
Maintaining the Vortechs System is easiest when there Is no flow entering the System. For this
reason, it is a good idea to schedule [he cleanout during dry weather. Cleanout of the Vortechs
System with a vacuum truck is generally the most effective and convenient method of
excavating pollutants from [he System. If such a [mck is no[ available, a "clamshell" grab may
be usetl, 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 [hat accumulate on a more routine
basis should be removed when an appreciable layer has been captured. 7o remove these
pollutants, it may 6e preferable to use adsorbent pads since [hey 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 antl 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'
3965846 Page 18 of 21
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VORTECHS~'" STORMWATER TREATMENT SYSTEM
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 paint above the
grit chamber.
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.
3965846 Page 19 of 21
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VORTECHS"" $TORMWATER TREATMENT SYSTEM
INSPECTION & MAINTENANCE LOG
Watero Floatahle Maintenance Maintenance
Date .Depth to ',Layer -Comments-
r - v - Pertormed Personnel
Setllment -.Thickness
1. The water tlepth to setliment is tletermined by taking Mro measurements with a statlia rotl: one measurement from
the manhole opening [o the tap of the setlimen[ pile and the other from Me manhole opening to the water surface.
When the tliRerence between the two measurements is siK inches or less, the System should be cleaned out.
2. For optimum performance, the System should be cleaned out when Ne floating hydrocarbon layer accumulates to
an appreciable thickness. In the even[ of a spill, the System should be cleanatl immetllately.
3965846 Page 20 of 21
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ATTACHDIENT "B"
POLLUTION SOURCE CONTROL PROGRARI
Pollution source controls are actions taken be a person or business to reduce the amount
of pollution reaching surface water and groundwater. A conscious control program is of
significant importance to [hc YELM COMMUNITY SCHOOLS, ns runoff will be
directed m e constructed wetland and infiltration disposal Cacilily that will ultimately
introduce [he collected runoff in to the shallow groundwater system. Many pollutants
generated on commercial sites can not be removed From the runoff by conventional
treatment and may eventually enter the shallow groundwater system. Hence, it is of great
importance to limit the development oRhese pollutants in the generated s[omnvater
runoff.
The subject controls are also known as "Best Management Practices" (BMP's), include:
• Minimizing vegetation/groundcover disturbance.
• Stabilizing existing exposed soil surfaces through fertilizing and seeding, and
mulching with chopped hay during the we[ season (15 October through 15
March).
• Maintaining roof, sidewalk and paved driveway areas free of debris accumulation;
refraining from using soaps and detergents in washing these exterior surfaces; and
carefully controlling activities in these areas so as to preclude hazardous materials
spills (i.c. chemical storage, vehicle maintenance, etc.).
• Substitute non-toxic products for toxic materials, recycle used oft and antifreeze
immediately.
• Refrain from storing hazardous or toxic chemicals or other substances. Where it
is imperative to store such materials, enclose them in a lockable cabinet.
• Limit the use of fertilizers and pesticides to the precise amount recommended by
professionals working the area.
Pollution source controls are needed because of the contamination found in runoff Gom
commercial areas and the effect o(this contamination on aquatic life and human heahh.
Research on urban runoff in the Puget Sound area and elsewhere has found oil and grease,
nutrients, organic substances, toxic metals, bacteria, viruses, end sediments al
unacceptable levels. Effects of contaminated runoff include closure of shellf sh
harvesting areas and swimming areas, mortality of young Lsh and other aquatic
organisms, himors on fish and impairment offish reproduction.
3965846 Page 21 of 21
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