Operation and Maintenance Plan 08-16-07 001SAMANTHA RIDGE
Prepared for:
Prepared by:
Operation & Maintenance Plan
Jack Long
The One Eleven Building
Auburn, WA 98002
(253)846-5756
August 14, 2007
Pete Swan
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Reviewed by: Jeff McInnis, PE
PETRA ENGINEERING, LLC
535 Dock Street, Ste 213
Tacoma, WA 98402
(253)752-7617
Project No: 06-036
Project Name: SAMANTHA RIDGE
Oper & Main -Samantha Ridge (08.14.07).doc
~' ~ E it; GII~BERING, LLC
535000X 3TREEr•9URE 219 ITACOMA I WAI B9d021 PHONE 126.9)]52-]61] I FAX 1269)]61-6562 1 NNJW.PETnAENG.NET
TABLE OF CONTENTS
I. STORMWATER FACILITY MAINTENANCE GUIDE 3
INTRODUCTION 3
What is Stormwater Runoff? 3
What is a Storm Drainage System and how does it work? 3
What does Stormwater Runoff have to do with Water Quality 3
Your Stormwater Facility 3
Who is Responsible for Maintaning Stormwater Facilities 3
How [o Use the Stormwater Facility Maintenance Guide 4
Included in This Guide q
A Regional Approach to Stormwater Management 4
YOUR STORMWATER FACILITIES 4
FACILITY KEY 4
SITE PLAN 5
QUICK LIST 6
MAINTENANCE CHECKLISTS 7
Detention Pond Checklist 6
Control Structure Checklist 11
Catch Basin Checklist 13
Vortechs Model 2000 Checklist i6
Fencing/Shrubbery ScreenlOther Landscaping Checklist 17
Grounds and Landscape Checklist 18
Drywells, French Drains, and Downspout Checklist 19
RESOURCE LISTING 2p
GLOSSARY 22
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I. STORMWATER FACILITY MAINTENANCE GUIDE
INTRODUCTION
What is Stormwater Runoff?
When urban and suburhan development covers the land with buildings, streets and parking lots, much of
the native topsoil, duff, trees, shrubs and grass are replaced by asphalt and concrete. Rainfall that would
have soaked directly into the ground instead stays on the surtace as Stormwater runoff making its way
into storm drains (including man-made pipes, ditches, or Swale networks), Stormwater ponds, surtace and
groundwater, and eventually to Puget Sound.
What is a Storm Drain System and how does it work?
The storm drain system for most developments includes measures to carry, store, cleanse, and release
the Stormwater. Components work together to reduce the impacts of development on the environment.
Impacts can include flooding which results in property damage and blocked emergency routes, erosion
which can cause damage to salmon spawning habitat, and pollution which harms fsh andlor drinking
water supplies.
The storm drain system provides a safe method to carry Stormwater to the treatment and storage area.
Swales and ponds filter pollutants from the Stormwater by physically settling out particles, chemically
binding pollutants to pond sediments, and biologically converting pollutants to less harmful compounds.
Ponds also store treated water, releasing it gradually to a nearby stream or to groundwater.
What does Stormwater Runoff have to do with Water Quality?
Stormwater runoff must be treated because it carries litter, oil, gasoline, fertilizers, pesticides, pet wastes,
sediments, and anything else that can float, dissolve or be swept along by moving water. Left untreated,
polluted Stormwater can reach nearby waterways where it can harm and even kill aquatic life. It can also
pollute groundwater to the extent that it requires treatment before it is suitable for drinking. Nationally,
stormwaler is recognized as a major threat to water quality. Remember to keep everything out of
stormwaler systems except the rainwater they are designed to collect.
Your Stormwater Facility
Different types of ponds are designed for different purposes. For example, wet ponds primarily provide
treatment of Stormwater. Dry ponds or infiltration ponds are designed [o provide storage for stormwaler
and allow for its gradual release downstream or into the ground. The private stormwaler facility for this
project includes a water quality LCF vault, a stormwaler retention vault, and a conveyance system to
collect site runoff from roadways, driveways, and roofs.
Who is Responsible for Maintaining Stormwater Facilities?
All Stormwater facilities require maintenance. Regular maintenance ensures proper functioning and
preserves visual appeal. This Stormwater Facility Maintenance Guide was designed to explain how
stormwaler facilities work and provide user-friendly, straightforward guidance on facility maintenance.
You are responsible for regularly maintaining privately owned ponds, catch basins, pipes and other
drainage facilities on your property. Stormwater facilities located in public rights-of-way are maintained by
local governments. The private Stormwater facilities on this site will be maintained by a homeowner's
association.
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How to Use the stormwater Facility Maintenance Guide
This Maintenance Guide includes a Site Plan specific to your development and a Facility Key that
identifies the private stormwater facilities you are responsible for maintaining. A "Quick List" of
maintenance activities has also been included to help you identify the more routine needs of your facility.
Included in This Guide
^ Comprehensive Maintenance Checklists that provide specific details on required maintenance
^ Pollution Prevention Tips that list ways to protect water quality and keep storm drain systems
functioning smoothly
^ Resources to provide more information and technical assistance
A Regional Approach to stormwater Management
It is important to educate and involve area residents in water quality issues and stormwater management.
stormwater runoff is a widespread cause of water quality impairment and stream degradation. The
jurisdictions should work together with residents, businesses, community groups and schools to address
this problem. This guide focuses on providing information in ways [hat you can reduce stormwater
impacts through pollution prevention and proper facility maintenance.
YOUR STORMWATER FACILITIES
This section consists of two parts that are to be used together: the Facility Key and the Site Plan.
Review the site plan and identify the numbers denoting a feature of the system. Then check the facility
key for the feature type and checklist name.
FACILIN KEY
The stormwater facility in your neighborhood is comprised of the following elements:
Type of Feature & Checklist Name Location on Site Plan
Detention Pond 1
Control Structure 2
Catch Basins 3
Vortechs Mode1200 q
FencinglShrubbery ScreenlOther Landscaping 5
Grounds and Landscape 6
Drywells, French Drains, or Downspouts See individual lot site plan.
'THE MAINTENANCE FOR THE VORTECHS MODEL 2000 IS AS REQUIRED BY THE
MANUFACTURER. IT IS ANTICIPATED AND RECOMMENDED THAT THE HOME OWNER
ASSOCIATION SIGN UP FOR REGULAR MAINTENANCE FROM THE PROVIDER OF THIS SYSTEM.
SITE PLAN
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QUICK LIST
The following is an abbreviated checklist of the most common types of maintenance required. Please go
over this checklist after heavy rains. The list represents minimum maintenance to be performed and
should be completed in conjunction with the other checklists for an effective maintenance program.
O Inspect catch basin grates to see that they are not clogged or broken. Remove twigs, leaves, or
other blockages. Contact the local jurisdiction to replace [he grate if it is broken.
O Inspect inlet and outlet pipes for blockages. Clear all blockages.
O Inspect filter strip, swale and pond walls for erosion or caved in areas.
O Inspect riprap (rocks) at the inlets and outlets of culverts and other pipes. If they are silted in or
eroded away, replace [hem.
MAINTENANCE CHECKLISTS
The Maintenance Checklists in this packet are for your use when inspecting the stormwater facilities on
your property. This packet has been customized so that only the checklists for your facilifies are included.
If you feel you are missing a checklist, or you have additional facilities not identified or addressed in this
packet, please contact your local jurisdiction.
The checklists are in tabular format for ease of use. Each describes the area to inspect, inspection
frequency, what to look for, and what action to take. A log sheet is included toward the end of the chapter
to help you [rack maintenance of your storm drainage system.
Although it is not intended for the maintenance survey to involve anything too diffcult or strenuous, there
are a few tools that will make the job easier and safer including:
^ Aflashlight
^ Along pole or broom handle
^ Some kind of pry bar or lifting tool for pulling manhole and grate covers
^ Gloves
A resource list is included in the next chapter. Here you will fnd the phone numbers of the agencies
referred to in the tables, as well as the contractors and consultants who designed and constructed your
(acilities.
SAFETY WARNING: In keeping with OSHA regulations, you should never stick your head or any part of
your body into a manhole or other type of confined space. When looking into a manhole or catch basin,
stand above it and use the flashlight to help you see. Use a long pole or broom handle to check sediment
depths in confned spaces. NO PART OF YOUR BODY SHOULD BREAK THE PLANE OF THE OPEN
HOLE.
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Detention Ponds Checklist
Date
Drainage Condition Contlition
Frequent System Problem sto sThat
y Feature Orc Ob OLa Ou Check For S~isd
Any [rash antl debris
which exceetl 5 cubic
feet per 1,000 square
feet (this is about
equal to the amount of
trash it wnuM take to
fJl up one stantlard
M
5 Geneal Trash 8 Debris size garbage can). In Trash antl tlebris
, general, there should clearetl from site.
be no visual evidence
of dumping. If less
than thresholtl all trash
antl debris will be
removed as part of
next scheduletl
maintenance.
Any poisonous or No danger of
nuisance vegetation poisonous vegetation
which may constitute a where maintenance
hazard to
maintenance personnel or the public
personnel or the might normally be.
A
General
Poisonous Vegetation
public. Any evidence (Coortlinate with local
weetl board) Complete
antl noxious weeds of noxious weetls as eratlication of noxious
tle(ned by Stale or weetls may not be
local regulations. possible. Compliance
(Apply requirements of with State or local
adopted IPM policies eradication policies
for the use of required
herbicides .
No conaminants or
Any evitlence of oil, pollutants present.
M
S General Contaminants antl gasoline, (Coordinate
, Pollution contaminants or other removal/cleanup with
pollutants local water quality
response agency).
Rotlen[s destroyetl
Any evidence of antl dam or berth
rotlent holes if facility repaired. (Coordinate
s acting as a tlam or with local health
M General Rotlenl Holes berm, or any evitlence depadment:
of water piping coordinate with
through dam or berm Ecology Dam Safety
via rotlent holes. ORCe if pond exceetls
10 acre-feet.
Faciliy is relumetl to
design function.
Dam results in change (Coortlinate trapping
M General Beaver Dams or function of the of beavers antl
facility. removal of tlams with
appropriate permitting
agencies)
When insecLS such as Insects tlestroyed or
A
General
Insects wasps antl homers removetl from site.
APPly insecticttles in
intertere vnth Compliance with
maintenance activities. adoptetl IPM policies-
'.hTHA R.,.'L ._- ~-
Tree growth does not
allow maintenance Trees tlo not hinder
access or interferes maintenance activities.
Tree Growth antl with maintenance Harvestetl trees
A General
Hazard Trees activity (i.e., slope shoultl be recyGed
mowing, silt removal, into mulch or other
vactoring, or beneficial uses (e.g.,
equipment alders for firewood).
movements . If
If tlead diseased or tlying
bees are itlentified (Use a
A General cedifietl Arborist to Remove hazard Trees
determine health of tree or
remOVa regnlrements)
Erotletl damage over Slopes shoultl be
2 inches deep where stabilizetl using
cause of damage is appropriate erosion
M Side Slopes of Pontl Erosion still present or where control measure(s);
there is potential for e.g., rock
continued erosion reinforcement, planting
. of grass, compaction.
If erosion is occumng on
Any erosion observed on a compacfetl berms a licensetl
M,S Side Slopes of Pond compactetl berm civil engineer shoultl be
embankment consulted to resolve source
of erosion.
Accumulated sediment
that ezceeds 16%
'
' Sediment Geaned out
(typically 6
to 12
) of
the designed pontl to tlesignetl pontl
M
Storage Area
Sediment
depth unless shape antl tlep0;
otherwise speGfied or pontl reseetletl if
affects inleuing or necessary to control
outleNng cgndition of erosion.
_ the facili .
Liner Is visible and has Liner repaired or
M Storage Area Gner (If Applicable) more than three l/4- replaced Liner is fully
inch holes in it. wveretl.
Any part of berm
which has settled 4
inches lower than the
tlesign elevation. if
settlement is apparent,
measure berm [o
tletermine amount of
A
Pontl Berms (Dikes)
Settlements settlement. Settling Dike is built back to
can be an intlication of the tlesign elevation.
more severe problems
with the berth or outlet
works. A licensed Gvil
engineer shoultl be
consulted to tletermine
the source of the
settlement.
Discernable water flow
through pond berm.
Ongoing erasion with
potential for erosion to
continue. Piping eliminatetl.
A Pontl Berms (Dikes) Piping (Recommend a Erosion potential
Goetechnical engineer resolved.
be wlletl in to inspect
antl evaluate condition
and recommentl repair
of wntlition.
Trees should be
removed. If root
Tree growth on system is small (base
emergency spillways less than 4 inches) the
creates bOCkage root system may be
A Emergency Overilowl Tree Growth Problems antl may left in place. Otherwise
the roots should be
Spillway cause failure of the
berm tlue to removetl and the berm
unwn(rolletl restored. Alicensetl
overtopping. civil engineer should
be consultetl far
proper berm/spillway
restoration.
Only one layer of rock
exisks above native
soil in area fve spuare
Emergency Overflow) Emergency Overflow/ feet or larger, or any Rocks antl patl tlep(h
A Spillway Spillway exposure of naive soil are restoretl to design
at [he top of out Oaw standartls.
path of spillway. (Rip-
ap on inside slopes
neetl not be replacetl.)
(M) Monthly from November through April.
(A) Once in late summer (preferably September)
(S) After any major storm (use 1-inch in 24 hours as a guideline).
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Control Structure/Flow Restrictor Checklist
Dale
Frequent Drainage Contli[ion Contlition
sThal
y System Problem sto S
d
Feature Oxq O~ CtF ~~ Check For EZist
Material exceeds Control structure
M General Trash and Debris 25% of sump depth orifice is not
(Includes Sediment) or 1 foot below blocked. All trash
orifice plate. and debris removed.
Structure is not Structure securely
A General Structural Damage securely attached to attached to wall and
manhole wall. outlet pipe.
Structure is not in
A General Structural Damage upright position Structure in correct
(allow up to l0% position.
from plumb .
Connections to
Connections to outlet pipe are water
A General Stmctural Damage outlet pipe are not light; structure
watertight and show repairetl or replaced
signs of rust. and works as
desi ned.
Any holes-other
than designed Structure has no
A General Structural Damage
holes-in the holes other than
structure. designed holes.
Damaged or Cleanout gate is not Gale is watertight
A Cleanout Gate Missing watertight or is and works as
missin desi ned.
Gale cannot be
Damaged or
moved up and down Gate moves up and
A Cleanout Gale
Missing
by one maintenance down easily and is
watertight.
erson.
Damaged or Chain/rod leading to Chain is in place
A Cleanout Gale Missing gate is missing or antl works as
dama ed. tlesi ned.
Damagetl or Gate is msled over Gate is repairetl or
A Cleanout Gate Missing 50 % of its surface replaced to meet
area. tlesign standartls.
Control device is
A
Odfce Plate Damaged or not working properly
due to missing, out Plate is in place antl.
Missing
of place, or bent works as designed.
odfce late.
Any trash, debris,
sediment
or plate is free of all
M,5 Orifce Plate Obstructions , obstructions and
vegetation blocking
the late. works as designed.
Any trash or tlebrls
blacking (or having Pipe is free of all
OverFlOw Pipe Obstructions the potential of obstructions and
blocking) the works as designed.
overflow i e.
Cover is missing or
only partially in
A Manhole Cover Not in Place place. Any open Manhole is closed.
manhole requires
maintenance.
Mechanism cannot
6e opened by one
maintenance
person with proper
A Manhole Locking Mechanism tools. Bolts into Mechanism opens
Not Working frame have less with proper tools.
than 1/2 inch of
thread (may not
apply to self-locking
litls .
One maintenance
person cannot
remove lid after Cover can be
Cover Diffcult to lying normal removed and
A Manhole Remove liftin
9 Pressure. reinstalled by one
Intent is to keep maintenance
coverfrom sealing person.
off access to
maintenance.
Ladder is unsafe
due to missing Ladder meets
A
Manhole Ladder Rungs mngs,
misalignment
not design slandartls.
Unsafe ,
securely attached to Allows maintenance
slrudure wall, rust, person safe access.
or cracks.
Key:
(M) Monthly from November through April.
(A) Once in late summer (preferably September)
(S) After any major storm (use 1-inch in 24 hours as a guideline).
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Catch Basins Checklist
FREpUENCY DRAINAGE
SYSTEM
DATE
PROBLEM CONDITIONS TO CHECK CONDITIONS THAT SHOULD
FEATURE FOR EXIST
A General "Dump no Stencil or stamp shoultl be Warning signs (e g., "Dump No
pollutants" visible antl easily read. Waste-0rains to Stream') shall
Stencil or be paintetl or embossetl on or
stamp not atljacent to all storm tlrain
visible inlets.
M,5 General Trash & Trash or tlebris which is No (rash or tlebris locatetl
Debris located immetliately in front of immediately in Gont of vetch
the catch basin opening or is basin or on grate opening.
blacking inletting capacity of
the basin b more than 10%.
M General Trash & Trash or debris (in the basin) No trash or tlebris in the vetch
Debris Ual exceetls 60 percent of the basin.
sump tlepth as measuretl 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.
M General Trash & Trash or tlebris in any inlet or Inlet antl outlet pipes free of
Debris outlet pipe blocking more Than trash or tlebris.
il3 of its height.
M General Trash 8 Deatl animals or vegetation No tleatl animals or vegetation
Debris That coultl generate odors that present within the catch basin.
coultl cause complaints or
tlangerous gases (e.g.,
methane.
M General Setllment Setliment (in the basin) that No sediment in the catch
exceetls 60 percent of the basin.
sump tlepth as measuretl from
the bottom o! basin to invert of
the lowest pipe into ar out of
the basin, but in no rase less
than a minimum of 6 inches
clearance from the sediment
surface m the roved of the
lowest ipe.
A General SVUCture Top slab has holes larger than Top slab is hee of holes antl
Damage to 2 square inches or cracks cracks.
frame antllor wider than'/. inch (Intent is to
Top Slab make sure no material is
running into basin)
A General Structure Frame not sitting flush on top Frame is sitting push on the
Damage to slab, i.e., separation of more riser rings or top slab and
Frame and/or than'/. inch of Ne frame from Flrmly at[achetl.
Top Slab the lop slab. Frame not
securely attachetl.
Catch Basins Checklist Continued)
A General Fractures or Maintenance person jutlges Basin replacetl or repairetl to
Cocks in that sVUCture is unsound. design stantlartls.
Basin Walls/
Bottom
A General Factures or Grout fillet has separated ar Pipe is regroutetl and secure
Cracks in cracketl wider than'/: inch and at basin wall.
Basin Wallsl longer than 1 fool at the joint of
Bottom any inleVOUtlet pipe or any
evidence of soil particles
entering catch basin through
tracks.
A General Settlement/ If failure of basin has created a Basin replacetl or repaired to
Misalignment safety, function, or design design stantlartls.
mblem.
M General Vegetation Vegetation growing across antl No vegetation blocking
blocking more than 1g% of the opening to basin.
basino enin .
M General Vegetation Vegetation growing in No vegetaton or root growth
inleVOUtlel pipe joints that is present.
more than six inches tall and
less than siz inches apart.
M General ConlaminatiD Any evidence of oil, gasoline, No conWminan(s or pollutants
n antl wntaminants or other present.
Pollution pollutants (Coordinate
removal/cleanup with local
Watef gUdlty respDOSe
a enc .
A Catch Basin Cover not in Cover is missing or only Any open catch basin requires
Cover place partially in place maintenance. Catch basin
cover is Gosetl.
A Catch Basin Locking Mechanism cannot be Dpenetl Mechanism opens with proper
Cover Mechanism by one maintenance person tools.
Not Working with proper tools. Bolls into
Name have less than'/, inch of
thfeatl.
A Catch Basin Cover One maintenance person Cover can be removetl by one
Cover DiRCUII to cannot remove litl after maintenance person.
Remove applying normal lifting
pressure. (Intent is keep cover
from sealing off access to
maintenance.
A Latltler Ladder Latltler is unsafe tlue to Ladtler meets design
Rungs missing rungs, not securely standards and allows
Unsafe aBachetl to basin wall, maintenance person safe
misalignment, rust. cracks, or access.
shar etl es.
A Grates Grate Grate with opening witler than Grate opening meets tlesign
Opening ]/8 inch. stantlartls.
Unsafe
M,5 Gates Trash 8 Trash and debris that is Grate tree of trash and debds.
Debris blocking more than 2g % of
grate surface inletting capacity.
Ca[ch Basins Checklist (Continued)
A Grates Damaged or Grate missing or broken Grate is in place and meets
Missing member(s) of the grate. tlesign stantlards.
If you are unsure whether a problem exists, please contact a Professional Engineer.
Key:
(M) Mon[hly from November through April.
(A) Once in late summer (preferable September).
(S) After any major storm (use 1-inch in 24 hours as a guideline).
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Vortechs Stormwater Treatment System Checklist
Dare
Drainage Contlition Contlition
Frequent
System i
Problem
s [o s That
y Feature ~~ ~~ (~~ ~~ Check For SExisttl
Sediment depth is
Sediment
within 6" of tlry Accumulated
M,S General
accumulation
weather water sediment should be
surtace elevation. removed.
Trash and debris
accumulated in Trash and debris
M,S General Trash and Debris vault, or pipe removed from vault,
Accumulation inleUoudet, and inletloutlel
floalables and non- piping.
Floatables.
Oil is extracted from
vault using
Oil accumulation vac[oring methods.
that exceeds 1-inch Coalescing plates
M,S General Oil Accumulation at [he water are cleaned by
surtace. thoroughly rinsing
and flushing. Should
be no visible oil
de lh on water.
Intel ar outlet piping
A Structure Damaged Pipes damaged or broken Pipe repaired and or
and in need of replaced.
re air.
Baffles cortoding,
cracking, warping
and/or showing Baffles repaired or
A Structure Baffles signs of failure as replaced to
tletermined by specifcations.
maintenance/inspec
lion ersan.
Cracks wider than
1/2-inch or evidence
Vault Structure of soil particles Vault replaced or
Damage -Includes entering the
repairs made so
Cracks in Walls structure through that vault meets
A Structure ,
Bottom, Damage to the cracks, or
design
Frame and/or Top maintenance/inspec specifications and is
Slab (ion personnel structurally sountl.
determine that the
vault is not
struclurall sound.
Vault Structure Cracks witler than
Damage-Includes t/&inch at the joint Vault repaired so
Cracks in Walls of any inletloutlel that no cracks exist
A Structure ,
Bottom, Damage to pipe or evidence of wider than t/4-inch
Frame and/or Top soil particles at the joint of the
Slab entering through the inletloutlel pipe.
cracks.
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Fencing/Shrubbery Screen/Other Landscaping Checklist
FREOUENCV DRAINAGE
SYSTEM
DATE
PROBLEM CONDITIONS TO CHECK CONDITIONS THAT SHOULD
FEATURE FOR EXIST
M General Missing or Any defect in the fence or Fence is mentletl or shrubs
broken padsl screen that permits easy entry replacetl to Corm a solid bartier
tleatl to a facility. to entry.
shrubbe
M,S General Erosion Erosion has resulletl in an Replace soil untler fence sc
opening untler a fence that that no opening exceetls 4
allows ent b eo le or pets. inches in height.
M General Unruly Shrubbery is growing out of Shrubbery is trimmed and
vegetation control or is infestetl wiN weetletl to provitle appealing
weetls. aesthetics. Do not use
chemicals to control weetls.
A Fences Damagetl Posts out of plumb more than Posts plumb to within 1-1/2
pads 6 inches. inches of plumb.
A Fences Damaged Top rails bent more than 6 Top rail free of bends greater
parts inches. than linch.
A Fences Damagetl Any pan of fence (inGUtling Fence is aligned antl meets
parts posts, top rails, and fabric) tlesign slantlartls.
more than 1 toot out of design
ali omen[.
A Fences Damagetl Missing or loose tension wire. Tension wire in place and
parts holding fabric.
A Fences Damaged Missing or loose barbed wire Barbed wire in place with less
parts that is sagging more than 2-1/2 Than'/.-inch sag between
inches between posts. posts.
A Fences Damagetl Extension arm missing, Extension arm in place with no
parts broken, or bent out of shape bends larger than'/.inch.
more than 1-1/2 inches.
A Fences Detedora[ed Pan or pads that have rusting Structurally atlequale posts or
pain( or or sraling contliticn that has parts with a uniform protective
protective affectetl structural adequacy. coating.
coating
M Fences Openings in Openings in fabric are such No openings in fabric.
fabric that an 8-inch tliameter ball
could fit throw h.
If you are unsure whether a problem exists, please contact a Professional Engineer.
KnY
(M) Monthly from November through April.
(A) Once in late summer (preferable September).
(S) After any major storm (use 1-inch in 24 hours as a guideline).
Grounds and Landscape Checklist
FREODENCY DRAINAGE
SYSTEM
DATE
PROBLEM CONDITIONS TO CHECK CONDITIONS THAT SHOOLO
FEATORE FOR EXIST
M General Weetls Weetls growing in more than Weetls present in less than 5
(nonpoisonou 20 % of the lantlsmpetl area of the landscaped area.
s trees antl shrubs onl
M Geneal Insect hoard Any presence of poison ivy or No poisonous vegetation or
other poisonous vegetation or insect pests present In
insect pests. lantlsm ed area.
M,5 General Trash or litter See Pontls Checklist See Ponds Checklist
M,5 General Erosion of Noticeable rills are seen in Causes of erosion are
Grountl landscaped areas. itlentiFletl antl steps are taken
Surface to slow down/spread out the
water Erotletl areas are filled,
contoured, antl seedetl.
A Trees antl Damage Limbs or parts of trees or Trim trees/shmbs to restore
shrubs shrubs that are split or broken shape. Replace trees/shmbs
which affect more than 25% of with severe tlamage.
the total foliage of the Tree or
shrub.
M Trees and Damage Trees or shrubs that have Replant tree, inspecting for
shrubs been blown tlovm or knocketl injury to stem or roots.
over. Replace if severe) tlama etl.
A Trees and Damage Trees or shrubs which are not Place slakes and rubber-
shrubs adequately suppodetl or are mated ties around young
leaning over, causing treeslshrubs for support.
exposure of the roots.
If you are unsure whether a problem exists, please contact a Professional Engineer.
_Key_
(M) Monthly from November through April.
(A) Once in late summer (preferable September).
(S) After any major storm (use 1-inch in 24 hours as a guideline).
Drywells, French Drains, or Downspouts Checklist
INSPECTION
AREA FREQUENCY LOOK FOR ACTION ~~
Downspout Annually Water overtlowing from the First clean the gutters and
downspout over the ground. downspouts. If this doesn't
solve the problem, a larger
d ell ma be re wired.
Roof Annually Moss and algae taking over the Disconnect flexible part of the
shadier parts of the shingles. downspout leading to [he
drywell. Remove moss.
Pressure washing or use of
fatty acid solutions instead of
highly toxic pesticides or
chlorine bleach is preferred.
Install a zinc strip as a
preventative.
c._ r e~
RESOURCE LISTING
If you suspect a problem exists, please contact your local jurisdiction at one of the numbers below and
ask for Technical Assistance.
Contact Numbers:
City of Yelm Public Works (360) 458-8406
WSU Cooperative Extension (253) 798-7180
Developer Information:
Client Name Jack Long
Address The One Eleven Building
City, ST Zip Auburn, WA 98002
Phone (253)846-5756
Engineer's Information'
PETRA ENGINEERING
535 Dock Street -Ste. 213
Tacoma, WA 98402
(253)752-7617
LOG SHEET
Use log sheets to track maintenance checks and what items, if any, are repaired or altered. The
completed sheets will serve as a record of maintenance activity and will provide valuable information
about how your facilities are operating. Log sheets should be kept in a dry, readily accessible place.
INSPECTION DATE:
PERFORMED BV:
PHONE NUMBER: ADDRESS:
POSITION ON HOA: CITY, ST, ZIP:
_ _-_ - ~ _.
i
-__. __
., 144 rtv:,= _c.'4.v' .~E 22
GLOSSARY
BEST MANAGEMENT PRACTICE (BMP)_- Structures, conservation practices, or regulations that
improve quality of runoff or reduce the impact of development on [he quantity of runoff.
BIOFILTER (SWALE) - A wider and flatter vegetated version of a ditch over which runoff flows at uniform
depth and velocity. Bioflters pertorm best when vegetation has a thick mat of roots, leaves, and stems at
the soil interface (such as grass).
BIOFILTRATION -The process through which pollutant concentrations in runoff are reduced by filtering
runoff through vegetation.
BUFFER -The zone that protects aquatic resources by providing protection of slope stability, attenuation
of runoff, and reduction of landslide hazards. An integral part of a stream or wetland ecosystem, it
provides shading, input of organic debris, and coarse sediments to streams. It also allows room for
variation in stream or wetland boundaries, habitat for wildlife, and protection from harmful intrusion.
CATCH BASIN - An inlet for stormwater set into the ground, usually rectangular and made of concrete,
and capped with a grate that allows stormwater to enter.
CHECK DAM -Adam (e.g., rock, earthen, log) used in channels to reduce water velocities, promote
sediment deposition, and/or enhance infltration.
COMPOST STORM WATER FILTER - A treatment facility that removes sediment and pollutants from
stormwater by percolating water through a layer of specially prepared bigleaf maple compost.
CONSTRUCTED WETLAND - A wet pond with dead storage at varied depths and planted with wetland
plants to enhance its treatment capabilities.
CONTROL STRUCTURE (FLOW RESTRICTOR) - A manhole and/or pipe structure with aflow-regulating
or metering device such as a weir or plates with small holes known as orifces. This structure controls [he
rate at which water leaves the pond.
CONVEYANCE -A mechanism or device for transporting water including pipes, channels (natural and
man-made), culverts, gutters, manholes, etc.
CRITICAL AREA -Areas such as wetlands, streams, steep slopes, etc. as defined by ordinance or
resolution by the jurisdiction. Also known as "environmentally sensitive areas"
CULVERT - A conveyance device (e.g., concrete box, pipe) that conveys water from a ditch, Swale, or
stream under (usually across) a roadway or embankment.
DEAD STORAGE -The volume of storage in a pond below the outlet that does not drain after a storm
event. This storage area provides treatment of [he stormwater by allowing sediments to settle out.
DETENTION FACILITY -A facility (e.g., pond, vault, pipe) in which surface and storm water is temporarily
stored.
DETENTION POND - A detention facility in the form of an open pond.
DIS_P_ERSION TRENCH - An open-top trench filed with riprap or gravel [hat takes the discharge from a
pond, spreads it out, and spills (bubbles) the flow out along its entire length. Dispersion trenches are
used to simulate "sheet flow" of stormwater from an area, and are often used to protect sensitive adjacent
areas, such as wetlands.
DRAINAGE SYSTEM -The combination of Best Management Practices (BMPs), conveyances,
treatment, retention, detention, and ouffall features or structures on a project.
DROP STRUCTURE - A structure for dropping water to a lower elevation antl/or dissipating energy. A
drop may be vertical or inclined.
~:_~~~ ne. u.c'
DRY PONE] - A detention facility that drains completely after a storm. This type of pond has a pipe outlet
at the bottom.
EASEMENT -Aright afforded a person to make limited use of another's real property. Typical
easements are for pipes or access to ponds, and may be 15 to 20 feet wide.
EMERGENCY OVERFLOW OR SPILLWAY - An area on the top edge of the pond that is slightly lower in
elevation than areas around it. This area is normally lined with riprap. The emergency overflow is used
only if the primary and secondary outlets of the pond fail, in the event of extreme storms, or if the
infiltration capability of the pond becomes significantly diminished. If the emergency overtlow ever comes
into play, it may indicate the pond needs to be upgraded.
ENERGY DISSIPATER - A rock pad at an outlet designed to slow the velocity, spread out the water
leaving the pipe or channel, and reduce the potential for erosion.
FREEBOARD -The vertical distance between the design high water mark and the elevation of the top of
the pond. Most ponds have one to two feet of freeboard to prevent them from overflowing.
INFILTRATION -The soaking of water through the soil surface into the ground (percolation). (Many
ponds are designed to fully infiltrate stormwater, and thus do not have a regularly used discharge pipe.)
INFILTRATION FACILITY (or STRUCTURE) - A facility (pond or trench) that retains and percolates
stormwater into [he ground, having no discharge (to any surface water) under normal operating
conditions.
JUNCTION -Point where two or more drainage pipes or channels converge (e.g., a manhole).
JURISDICTION -Olympia, Lacey, Tumwater, or Thurston County (as applicable).
LINED POND or CONVEYANCE - A facility, the bottom and sides of which have been made impervious
(using, for example, a plastic liner or clay/silt soil layer) to the transmission of liquids.
LIVE STORAGE -The volume of storage in a pond above the outlet that drains after a storm event. This
storage area provides flood control and habitat protection for nearby streams.
MANHOLE -A larger version of a catch basin, often round, with a solid lid. Manholes allow access to
underground stormwater pipes for maintenance.
NATURAL CHANNEL -Stream, creek, river, lake, wetland, estuary, gully, Swale, ravine, or any open
conduit where water will concentrate and flow intermittently or continuously.
OIL-WATER SEPARATOR - A structure or device used to remove oil and greasy solids from water. They
operate by using gravity separation of liquids that have different densities. Many catch basins have a
downturned elbow that provides some ail-water separation.
OUTFACE -The point where water flows from aman-made conduit, channel, or drain into a water body or
other natural drainage feature.
RETENTION FACILITY - An inf Itration facility.
RETENTION POND - A retention facility that is an open pond.
REVETMENTS -Materials such as rock or keystones used to sustain an embankment, such as in a
retaining wall.
RIP RAP -Broken rock, cobbles, or boulders placed on earth surfaces, such as on top of a berm for the
emergency overflow, along steep slopes, or at the outlet of a pipe, for protection against the action of
water. Also used for entrances to construction sites.
RUNOFF-stormwater.
SAND FILTER -A treatment facility that removes sediment and pollutants from stormwater by percolating
water through a layer of sand.
STORMWATER -That portion of precipitation that falls on property and that does not naturally percolate
into the ground or evaporate, but flows via overland flow, channels or pipes into a def ned surface water
channel, or a constructed infllration facility. Stormwater includes washdown water and other wastewater
that enters the drainage system.
SWALE - A shallow drainage conveyance with relatively gentle side slopes, generally with flow depths
less than one foot. This term is used interchangeably with "BIOFILTER".
TRASH RACK or BAR SCREEN - A device (usually a screen or bars) that fits over a pipe opening to
prevent large debris such as rocks or branches from entering and partially blocking the pipe.
WET POND - A stormwater treatment pond designed with a dead storage area to maintain a continuous
or seasonal static water level below the pond outlet elevation.