Stormwater Operation and Maintenance Plan~'~~-05-2001 THU 11 24 AM SKILLINGS-CONNOLLY FAX N0. 360 491 3857 P, 03
Storntwater operation and Maintenance Plan
for
Willow Glen Play
Yelm, Washington
July 5, 2001
Skillings-Connolly, Inc.
Consulting engineers
Lacey, WA 98503
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tracility Operation
The two stormwater treatment and discharge facilities are located within Willow Glen plat. The
facilities use gravity flow and infiltration to treat and discharge the generated stormwater.
stormwater is collected using roadway catch basins and conveyed to the facilities where it flows
across grass swales, treated and then into underground galleries and discharged.
Maintenance Requirements
The following maintenance requirements are required on an as needed basis.
- Mow the grass
- Irrigate as necessary to ensure health grass growth
The following is required on an annual basis
Inspect leveler boards. Replace damaged boards when damaged is discovered.
Inspect gallery catch basins. Remove debris when the depth of sediment reaches 1- or
greater.
`"he remaining maintenance schedule items are included on the maintenance schedule from the
drainage report.
~_ "~~ ""^" THU 11;24 AM SKILLINGS-CONNOLLY FAX N0. 360 491 3857 P. 05
.,-r..U:
APP~n~aix a
Maintenance Schedule
SKiLL1NGS-CONN~Y, INC. Al/ddle Road Plat
Consulting Engineers Storm Drainage Analysl5 & RepOR
'"'-05-2001 THU 11:4 AM SKILLINGS-CONNOLLY FAX N0, 360 491 3857 P, 06
~~~
MAINTENANCE CHECKLIST
Maintenance Checklist for Ponds
Frequency Drainage System _ ( Problem Conditions to Check For Conditions That Should Exist
Feature v
M,S General ., f Trash & debris Dumping of yard waste such as grass Remove trash & debris and
`~ build-up in pond. clippings and branches into basin. dispose as pre-scribed by City
Unsightly aCCUmulation of non- Waste Management Section.
degradable materials such as glass,
plastic, metal, foam and coated a r.
M _ (
~ Poisonous Any poisonous vegetation in which Remove poisonous vegetation.
Y vegetation may constitute a hazard to the public. po not spray chemicals on
Examples of pdsonous vegetation vegetation without obtaining
indude: tansy tagwork, poison oak, guidance from the Cooperative
skfnging nettles, devils dub- Extension Service and approval
from the City.
M,S _ 1 Flre hazard or Presence of chemicals such as natural Find sources of pollution and
V pollution gas, oil, and gasoline, obnoxious color, eliminate them- Water Is free
odor, or sludge noted. from noticeable color, odor, or
contamination.
M Grass not For grassy ponds, grass Cover is Grass cutting unnecessary
Y
Y growing or is sparse and weedy or is overgrown. unless dictated by aesthetics.
overgrown.
M ~ f Rodent holes Any evidence of rodent hole& if facility Rodents destroyed and dam or
Y is acting as a dam or berm, or any berm repaired. Contact the
evidence of water piping through dam Thurston County Health
or berm via rodent Holes. De artment for guidance,
M A 1 Ir-sects When Insects such as wasps and insects destroyed or re-moved
`~ hometS intertere with maintenance from site- Contact Cooperative
aetlvlties, or when mosquitoes became Extension Service for guidance.
a nuisance.
A „ J Trea growth Tree growth does not allow Trees do not hinder maintenance
V maintenance access or interferes with activiGes_
maintenance activity (I.e., slope
mowing, silt removal, Or equipment
movements}. If trees are not
Interfering with access, leave trees
alone.
M Slde slopes of „f Erosion on Check around Inlets and outlets for Flnd causes or erosion and
pond `r berms or at signs of erosion. Check berms for eliminate them. Then slopes
entrancelexit signs of sliding or SetUing. Action is should be stabilized by using
needed where eroded damage over 2 appropriate erosion control
Inches deep and where there is measure(s)- e.g., rock
potential for wntinued erosion. reinforcement, planting of grass,
com action.
M Storage area „f Sediment ACCUmulated sediment that exceeds Sediment Leaned out to
YY buildup in pond 14% of the designed pond depth. designed pond shape antl tlepth;
9urled or partidlly buried outlet pond re-seeded if necessary to
structure probably indicates significant Control erosion.
sediment de osiLs.
A Emergency ~ Water obstructer Debris block outlet. Remove debris.
overflow
If you are unsure whether a problem exists, please contact the jurisdiction and ask for teenrneal assistance.
Comments:
A =Annual (March or April preferred)
M =Monthly (see schedule}
S =After major storm
,;~~-C~-2001 THU 11 24 AM SKILLINGS-CONNOLLY FRX N0, 360 491 3857 P, 07
MAINTENANCE CHECKLIST (CQNTINUED)
Maintenance Checklist for Infiltration Systems __
Frequency DralnagB System _ I Problem Conditions to Chedt For Conditions That Should Exist
Feature V
i M,S General ~ Trash & debris See Maintenance Checklist for Ponds. See Maintenance Checklist for
bulldu in pond Ponds.
M ~ Polsonkws See Maintenance Checklist for Ponds. See Maintenance Checklist for
Y vegetafian Pods.
M,S . J Fire hazard or See Maintenance Checklist for Ponds. See Maintenance Checklist for
polution Ponds.
M „ f Vegetation not bee Maintenance Checklist for Ponds. See Maintenance Checklist for
Y growing or is Ponds.
Overgrown
M , J Rodent holes See Maintenance Chedcllst for Ponds. See Maintenance Checklist for
`~ Ponds.
M , J Insects See Maintenance Checklist fkx Ponds. See Maintenance Chedklist for
`i Ponds-
A storage area ~ Sediment A sot! texture test indicates facNity is Sediment fs removed andlor
buildup in not working at its designed capabilities facility Is deaned so that
system or was incorrectly designed, infttration system works
according to design. A
sediment trapping area is
installed to reduce sediment
trans ort into infiltration area.
A _ 1 Storage area A soil texture test indicates fadlity is Additional volume is added
V drains slowly not working at its designed capabitities through excavation to provide
(more than 48 or was Incorrectly designed. needed storage. Soil is
hoUrS) or aerated and rototilied t0
overflows improve drainage. Contact the
Gty for information on its
requirements regarding
excavation.
M ~ Sediment Any Sediment and debris filling area to Clean out sump to design
Y
`~ trapping area 1096 of depth from sump bottom to depth.
bottom of outlet pipe or obstructing
flow into the connector
One Time ,
+ Sediment Storm water enters infiltration area Add a trapping area by
~
`i trapping area not directly without tre2tment. constructing a sump for settling
present of solids. Segregate settling
area from rest of facility.
Contact City for guidanCe-
If you are unsure whether a problem exists, please contact the Jurisdiction and ask for technical assistance
Comments:
A =Annual (March or April preferred)
M =Monthly (see schedule)
S =After major storm
J.UL-05-2001 THU 11 25 AM SKILLINGS-CONNOLLY FAX N0, 360 491 3857 P, 08
MAINTENANCE CHECKLIST (CQNTINUED)
e~!„~~~.,h~n~e r•tie,a.rat #r,r Knnrtlnnl.RhnihhPrv Screen/Other Landscaolna
.......~...~,.......
Frequene ,~.._~_.__._.. _.._
Drainage ...o
Problem
Conditions to Check FM
Conditions That Shoultl
y System Exist
Feature
M _ j Unruly Shrubbery is growing out of control or is Shrubbery Is trimmed and
v vegetation infesfed with weeds. weeded to provide
appeasing aesthetics. Do
not use Chemicals to
control weeds.
If you are unsure whether a problem exists, please contact the jurisdiction and ask fur technical assistance.
Comments.
JUL-05-2001 THU 11 25 AM SKILLINGS-CONNOLLY FAX N0. 360 491 3857 P, 09
MAINTENANCE CHECKLIST (CONTINUED)
Maintena nce Checklist f or C onveyance Sy stems (Pi es, Ditches, and Swales)
Frequene Drainage Problem Conditions to Check For Conditions That Should Exist
y system _ f
Feature V
t^;S Open ditches 'r Trash & debris Dumping of yard wastes such as grass Remove trash and debris.
`~ clippings and branches lento basin- Unsightly
accumulation of non-degradable materials
`~ such as glass, plastic, metal, foam and
coated r_
M _ 1 Sediment Accumulated sediment that exceeds 20% of Ditch cleaned of all sediment
V buildup the design depth. and debris so that is matches
design.
M „ r Erosion See Ponds Cheddist. See Ponds Checklist.
`~ damage t0
slo es
A Rock lining Maintenance person Can see native SOII Replace rocks t0 design
Y
Y out of place or b9neath the rock lining. standard.
missing (if
a plicable)
Varies Catch basins ~
~ See Catch Basins Checklist. See Catch Basins Checklist
'Yt,S Swales ~ Trash & debris See above far Ditches. See above for Ditches.
M „ J Sediment See above far Ditches. Vegetation may need to be
Y buildup replanted after deanirtg.
M ~ f Vegetation not Grass cover is sparse and weedy or areas Aerate soils and r~9seed and
`i growing or dre overgrown with woody vegetation. mulch bare areas. Maintain
overgrown grass height at a minimum of
6 inches for best storm water
treatment. Remove woody
growth, recontour, and
reseed a5 necessary.
I M,S _ I Erosion See Ponds Checklist. See Ponds Checklist.
Y damage to
slopes
M ., J Conversion by Swale has been filled in or blocked by shed, If possible, speak with
v home-owner woodpile, shrubl~ly, etc. homeowner and request that
~ swale area be restored.
incompatible Contact City t0 report
use problem if not rectified
voluntarily.
A w' Swale does Water stands in Swale or flow velocity is very A survey map may be
V not drain slow. Stagnation occurs. needed to check grades.
Grades need to be In 1-536
range if possibl6. If grade is
less than 1%, underdralns
may need to be installed.
;you are u nsure whether a p roble m exists, please c ontact the Jurisdiction and ask for technical assi stance.
Comments ;
A =Annual (March or April preferred)
M =Monthly (see schedule)
S =After major storm
,.UL-05-2001 THU 11:25 AM SKILLINGS-CONNOLLY FAX N0, 360 491 3857 P, 10
MAINTENANCE CHECKLIST (CONTINUED)
Maintenance Checklist for Grounds (Landscaping)
------------
Frequen ------ --- --
Drainage
Problem
Condltfons to Check For
Cpnditions That Should Exlsi
cy System "
Feature
M General ,~ f Weeds Weeds growing in more than 200 of the Weeds present In less than 5~0 of the
`~ (nonpdsono landscaped area (tress and shrubs only), landscaped area.
us)
M , f Safety Any presence of poison Ivy or other No poisonous vegetation or insect nests
`r Hazard ~sonous v etation or insect nests- present in landsca ed area_
M.S Trash or See Ponds Checklist. See Ponds Checklist.
litter
tN,S Erosion of Noticeable rills are seen in landscaped Causes of erosion are Idendtled and steps
ground areas. taken to stow down/spread out the water-
surface Etnded areas are filled, contoured, and
seeded.
A Trees and t J Damage l,lmbs or parts of trees or shrubs tllat are Trim tree/shrubs to restore shape. Replace
shrubs v split ar broken which affeot more than tr®esrshn,bs with severe damage.
25% or the totaE fdiage of V1e tre9 or
shrub.
M _ I Trees or shrubs that have then blown Replant tree, inspecting for inJury to stbm or
V doom or knocked over. roots. Re ace if severe) damaged.
A _ f Trees or shrubs which are not adequately Place stakes and rubuer-coated ties around
~! supported or are leaning over, causing young trees/shrub5 for support.
ex sure of the roots.
if you are unsure whether a problem eXlsts, please contact the jurisdiction and asic for technical assistance.
comments:
A =Annual (March or April preferred}
M =Monthly (see schedule)
S =Attar major storm