2021.0053 21-120 RPT-Maintenance Plan-2021-09-23
OWNER’S STORMWATER MAINTENANCE PLAN
of
Farrelli’s Yelm
813 W Yelm Avenue
Yelm, Washington 98597
for
Blackrock Industries
1106 39th Ave SE
Puyallup, WA 98374
by
THE LAND DEVELOPER’S
ENGINEERED SOLUTION
A Division of THE LAND DEVELOPER, Inc.
Erik B. Ainsworth, PE
PO Box 4420
Tumwater, WA 98501
(360) 250-3973
September 23, 2021
TABLE OF CONTENTS
I. STORMWATER MAINTENANCE PLAN .................................................... 3
I. STORMWATER MAINTENANCE PLAN
11
TABLE OF CONTENTS
I. STORMWATER FACILITY MAINTENANCE GUIDE ......................... 5
Introduction ........................................................................................................................... 5
What Is Stormwater Runoff? .................................................................................... 5
What Is a Storm Drain System and How Does It Work? ......................................... 5
What Does Stormwater Runoff Have to Do With Water Quality? ............................ 5
Stormwater Facilities................................................................................................ 5
Who Is Responsible for Maintaining Stormwater Facilities?.................................... 5
How to Use the Stormwater Facility Maintenance Guide? ...................................... 6
Included in This Guide ............................................................................................. 6
Your Stormwater Facilities .................................................................................................... 6
Facility Key ............................................................................................................................ 6
Site Plan ................................................................................................................................ 7
Quick List .............................................................................................................................. 8
Maintenance Checklists ........................................................................................................ 9
Infiltration Trench ..................................................................................................... 9
Resource Listing ................................................................................................................... 9
Log Sheet ............................................................................................................................ 10
II. Best Management Practices for Single Family Residence ......... 17
Farrelli’s Yelm September 23, 2021 PAGE 5
I. STORMWATER FACILITY MAINTENANCE GUIDE
Introduction
What Is Stormwater Runoff?
When urban and suburban 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 surface as stormwater
runoff making its way into storm drains (including man-made pipes, ditches or swale networks),
stormwater ponds, surface 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 that results in property damage and blocked emergency
routes, erosion that can cause damage to salmon spawning habitat and pollution that harms fish
and/or 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, stormwater is recognized as a major threat to water quality.
Remember to keep everything out of stormwater systems except the rainwater they are designed
to collect.
What Types of Stormwater Facilities Are There?
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 to provide storage
for stormwater and allow for its gradual release downstream or into the ground. Roof infiltration
trenches serve in infiltrate roof runoff directly into the ground reducing offsite stormwater
discharges.
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
Farrelli’s Yelm September 23, 2021 PAGE 6
how stormwater 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.
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. Also 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
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.
Facility Key
The stormwater facility in your neighborhood is composed of the following elements:
Type of Feature & Checklist Name Location on Site Plan
Grounds & Landscaping 1
Infiltration Trench 2
Downspouts 3
Treatment Cartridge Manhole 4
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5737 LINDERSON WAY SW,
TUMWATER, WA. 98501
PO BOX 4420, TUMWATER, WA. 98501
(360) 890-4806
E-MAIL: erik@thelanddeveloper.com
THE LAND DEVELOPER, INC.a division of
PROJECT:
CLIENT:
FARRELLIS BLACKROCK
813 W YELM AVE
YELM, WA 98597
BLACKROCK INDUSTRIES
REVISIONS: DATE:DRAWN BY:DATE:AGENCY NO:SHEET:JOB NO:OF21-120608/02/2021SaGFARRELLIS BLACKROCK NE 1/4, SECTION 24, TOWNSHIP 17 N., RANGE 1 E., W.M.ERI
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Farrelli’s Yelm September 23, 2021 PAGE 8
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.
Inspect catch basin grates to see that they are not clogged or broken. Remove twigs,
leaves or other blockages.
Inspect inlet and outlet pipes for blockages. Clear all blockages.
Inspect Amended soil area and infiltration trench cleanouts.
December 2016 Volume V – Stormwater BMPs C-13
#5 – Maintenance Checklist for Catch Basins:
Drainage
System
Feature
Defect or
Problem
Condition When
Maintenance Is Needed
Results Expected When
Maintenance Is Performed
Maintenance
Frequency Completed
General “Dump no
pollutants” (or
similar) stencil or
stamp not visible
Stencil or stamp should be visible and
easily read.
Warning signs (e.g., “Dump No Waste-
Drains to Stream” or “Only rain down
the drain”/ “Puget Sound starts here”)
painted or embossed on or adjacent to
all storm drain inlets.
General Trash and Debris Trash or debris which is located
immediately in front of the catch basin
opening or is blocking inlet capacity by
more than 10 percent.
No trash or debris located immediately
in front of catch basin or on grate
opening.
General Trash and Debris Trash or debris (in the basin) that exceeds
1/3 of the sump depth as measured from
the bottom of basin to invert of the lowest
pipe into or out of the basin, but in no
case less than a minimum of 6 inches
clearance from the debris surface to the
invert of the lowest pipe.
No trash or debris in the catch basin.
General Trash and Debris Trash or debris in any inlet or outlet pipe
blocking more than one-third of its height.
Inlet and outlet pipes free of trash or
debris.
General Trash and Debris Dead animals or vegetation that could
generate odors that could cause
complaints or dangerous gases (e.g.,
methane).
No dead animals or vegetation present
within the catch basin.
General Sediment Sediment (in the basin) that exceeds 1/3
of the sump depth as measured from the
bottom of basin to invert of the lowest
pipe into or out of the basin, but in no
case less than a minimum of 6 inches
clearance from the sediment surface to
the invert of the lowest pipe.
No sediment in the catch basin.
General Structure Damage
to Frame and/or
Top Slab
Top slab has holes larger than 2 square
inches or cracks wider than one-fourth
inch.
No holes and cracks in the top slab
allowing material to run into the basin.
General Structure Damage
to Frame and/or
Top Slab
Frame not sitting flush on top slab, i.e.,
separation of more than three-fourth inch
of the frame from the top slab. Frame not
securely attached.
Frame is sitting flush on the riser rings
or top slab and firmly attached.
December 2016 Volume V – Stormwater BMPs C-14
Drainage
System
Feature
Defect or
Problem
Condition When
Maintenance Is Needed
Results Expected When
Maintenance Is Performed
Maintenance
Frequency Completed
General Fractures or
Cracks in Basin
Walls/ Bottom
Maintenance person judges that structure
is unsound.
Basin replaced or repaired to design
standards.
General Fractures or
Cracks in Basin
Walls/ Bottom
Grout fillet has separated or cracked wider
than one-half-inch and longer than 1 foot
at the joint of any inlet/outlet pipe or any
evidence of soil particles entering catch
basin through cracks.
Pipe is regrouted and secure at basin
wall.
General Settlement/
Misalignment
If failure of basin has created a safety,
function, or design problem.
Basin replaced or repaired to design
standards.
General Vegetation Vegetation growing across and blocking
more than 10 percent of the basin
opening.
No vegetation blocking opening to
basin.
General Vegetation Vegetation growing in inlet/outlet pipe
joints that is more than 6 inches tall and
less than 6 inches apart.
No vegetation or root growth present.
General Contamination and
Pollution
Any evidence of oil, gasoline,
contaminants or other pollutants.
No contaminants or pollutants present.
(Coordinate removal/cleanup with
Thurston County Water Resources
360-754-4681 and/or Dept. of Ecology
Spill Response 800- 424-8802.)
Catch Basin
Cover
Cover Not in Place Cover is missing or only partially in place.
Any open catch basin requires
maintenance.
Catch basin cover is in place and
secured.
Catch Basin
Cover
Locking
Mechanism Not
Working
Mechanism cannot be opened by one
maintenance person with proper tools.
Bolts into frame have less than one-half-
inch of thread.
Mechanism opens with proper tools.
Catch Basin
Cover
Cover Difficult to
Remove
One maintenance person cannot remove
lid after applying normal lifting pressure.
(Intent is keep 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 to basin wall,
misalignment, rust, cracks, or sharp
edges.
Ladder meets design standards and
allows maintenance person safe
access.
December 2016 Volume V – Stormwater BMPs C-15
Drainage
System
Feature
Defect or
Problem
Condition When
Maintenance Is Needed
Results Expected When
Maintenance Is Performed
Maintenance
Frequency Completed
Grates Grate Opening
Unsafe
Grate with opening wider than seven-
eighths of an inch.
Grate opening meets design
standards.
Grates Trash and Debris Trash and debris that is blocking more
than 20 percent of grate surface inletting
capacity.
Grate free of trash and debris.
Grates Damaged or
Missing
Grate missing or broken member(s) of the
grate.
Grate is in place and meets design
standards.
If you are unsure whether a problem exists, contact a professional engineer.
December 2016 Volume V – Stormwater BMPs C-5
#2 – Maintenance Checklist for Infiltration Basins and Trenches:
Drainage
System
Feature
Defect or
Problem
Condition When Maintenance
Is Needed
Results Expected When
Maintenance Is Performed
Maintenance
Frequency Completed
General Trash and Debris Any trash and debris which exceed five
cubic feet per 1,000 square feet. If less
than threshold, all trash and debris will
be removed as part of next scheduled
maintenance.
Trash and debris cleared from site.
General Poisonous
Vegetation and
Noxious Weeds
Any poisonous or nuisance vegetation
which may constitute a hazard to
maintenance personnel or the public.
Any evidence of noxious weeds as
defined in the Thurston County
Noxious Weeds List. (Apply
requirements of adopted integrated
pest management policies for the use
of herbicides.)
No danger of poisonous vegetation
where maintenance personnel or the
public might normally be.
(Coordinate with Tacoma-Pierce
County Health Department) Complete
eradication of noxious weeds may not
be possible. Compliance with state or
local eradication policies required.
General Contaminants
and Pollution
Any evidence of oil, gasoline,
contaminants or other pollutants.
No contaminants or pollutants
present. (Coordinate removal/cleanup
with Thurston County Water
Resources 360-754-4681 and/or
Dept. of Ecology Spill Response 800-
424-8802.)
General Rodent Holes If the facility is constructed with a dam
or berm, look for rodent holes or any
evidence of water piping through the
dam or berm.
Rodents removed and dam or berm
repaired. (Coordinate with Thurston
County; coordinate with Ecology
Dam Safety Office if pond exceeds
10 acre-feet.)
General Beaver Dams Beaver dam results in an adverse
change in the functioning of the facility.
Facility returned to design function.
(Contact WDFW Region 6 to identify
the appropriate Nuisance Wildlife
Control Operator)
General Insects When insects such as wasps and
hornets interfere with maintenance
activities.
Insects destroyed or removed from
site. Apply insecticides in compliance
with adopted integrated pest
management policies.
December 2016 Volume V – Stormwater BMPs C-6
Drainage
System
Feature
Defect or
Problem
Condition When Maintenance
Is Needed
Results Expected When
Maintenance Is Performed
Maintenance
Frequency Completed
General Performance Check crest gauge against design
expectations (see Maintenance and
Source Control Manual).
Crest gauge results reflect design
performance expectations. Reading
recorded. County notified if not
meeting design performance.
Crest Gauge Crest Gauge
Missing/ Broken
Crest gauge is not functioning properly,
has been vandalized, or is missing.
Crest gauge present and functioning.
Repair/replace crest gauge if missing
or broken.
Storage Area Water Not
Infiltrating
Water ponding in infiltration basin after rainfall ceases and appropriate time allowed for infiltration. Treatment basins should infiltrate Water Quality Design Storm Volume within 48 hours, and empty within 24 hours after cessation of most rain events.
(A percolation test pit or test of facility
indicates facility is only working at
90 percent of its designed capabilities.
If 2 inches or more sediment is present,
remove).
Facility infiltrates as designed.
Sediment is removed and/or facility is
cleaned so that infiltration system
works according to design.
Filter Bags (if
applicable)
Filled with
Sediment and
Debris
Sediment and debris fill bag more than
one-half full.
Filter bag less than one-half full. Filter
bag is replaced or system is
redesigned.
Rock Filters Sediment and
Debris
By visual inspection, little or no water
flows through filter during heavy rain
storms.
Water flows through filter. Replace
gravel in rock filter if needed.
Trenches Observation Well
(Use Surface of
Trench if Well is
Not Present)
Water ponds at surface during storm
events. Less than 90 percent of design
infiltration rate.
Remove and replace/clean rock and
geomembrane.
Ponds Vegetation Exceeds 18 inches. Grass or groundcover mowed to a
height no greater than 6 inches.
Ponds Vegetation Bare spots. No bare spots. Revegetate and
stabilize immediately.
December 2016 Volume V – Stormwater BMPs C-7
Drainage
System
Feature
Defect or
Problem
Condition When Maintenance
Is Needed
Results Expected When
Maintenance Is Performed
Maintenance
Frequency Completed
Side Slopes
of Pond
Erosion Erosion damage over 2 inches deep
where cause of damage is still present
or where there is potential for
continued erosion.
Slopes stabilized using appropriate
erosion control measure(s); e.g., rock
reinforcement, planting of grass,
compaction.
If erosion is occurring on compacted
slope, a professional engineer should
be consulted to resolve source of
erosion.
Pond Berms
(Dikes)
Settlements Any part of berm which has settled 4
inches lower than the design elevation.
If settlement is apparent, measure berm
to determine amount of
settlement. Settling can be an indication
of more severe problems with the
berm or outlet works.
Dike is built back to the design
elevation.
If settlement is significant, a
professional engineer should be
consulted to determine the cause of
the settlement.
Pond Berms
(Dikes)
Piping Discernable water flow through pond
berm. Ongoing erosion with potential
for erosion to continue.
No water flow through pond berm.
Piping eliminated. Erosion potential
eliminated. Recommend a
geotechnical engineer be called in to
inspect and evaluate condition and
recommend repair of condition.
General Hazard Trees If dead, diseased, or dying trees are
identified.
Hazard trees removed. (Use a
certified Arborist to determine health
of tree or removal requirements).
General Tree Growth and
Dense
Vegetation
Tree growth and dense vegetation
which impedes inspection,
maintenance access or interferes with
maintenance activity (i.e., slope
mowing, silt removal, vactoring, or
equipment movements).
Trees and vegetation do not hinder
inspection or maintenance activities.
Harvested trees should be recycled
into mulch or other beneficial uses
(e.g., alders for firewood).
Pond Berms
(Dikes)
Tree Growth Tree growth on berms over 4 feet in
height may lead to piping through the
berm which could lead to failure of the
berm.
Trees on berms removed.
If root system is small (base less than
4 inches) the root system may be left
in place. Otherwise the roots should
be removed and the berm restored. A
professional engineer should be
consulted for proper berm/spillway
restoration.
December 2016 Volume V – Stormwater BMPs C-8
Drainage
System
Feature
Defect or
Problem
Condition When Maintenance
Is Needed
Results Expected When
Maintenance Is Performed
Maintenance
Frequency Completed
Emergency
Overflow/
Spillway
Tree Growth Tree growth on emergency spillways
creates blockage problems and may
cause failure of the berm due to
uncontrolled overtopping.
Trees on emergency spillways
removed.
If root system is small (base less than
4 inches) the root system may be left
in place. Otherwise the roots should
be removed and the berm restored. A
professional engineer should be
consulted for proper berm/spillway
restoration.
Emergency
Overflow/
Spillway
Rock Missing Only one layer of rock exists above
native soil in area five square feet or
larger, or any exposure of native soil at
the top of outflow path of spillway.
Rocks and pad depth restored to
design standards. (Riprap on inside
slopes need not be replaced.)
Emergency
Overflow/
Spillway
Erosion Erosion damage over 2 inches deep
where cause of damage is still present
or where there is potential for continued
erosion.
Any erosion observed on a compacted
berm embankment.
Slopes stabilized using appropriate
erosion control measure(s); e.g., rock
reinforcement, planting of grass,
compaction.
If erosion is occurring on compacted
berms a professional engineer should
be consulted to resolve source of
erosion.
Presettling
Ponds and
Vaults
Facility or sump
filled with
Sediment and/or
Debris
6 inches or designed sediment trap
depth of sediment.
No sediment present in presettling
pond or vault. Sediment is removed.
Drain Rock Water Ponding If water enters the facility from the
surface, inspect to see if water is
ponding at the surface during storm
events.
If buried drain rock, observe drawdown
through observation port or cleanout.
No water ponding on surface during
storm events.
Clear piping through facility when
ponding occurs. Replace rock
material/sand reservoirs as
necessary. Tilling of subgrade below
reservoir may be necessary (for
trenches) prior to backfill.
If you are unsure whether a problem exists, contact a professional engineer.
December 2016 Volume V – Stormwater BMPs C-42
#20 – Maintenance Checklist for Grounds (Landscaping):
Drainage
System
Feature
Defect or Problem Condition When Maintenance Is
Needed
Results Expected When Maintenance
Is Performed
Maintenance
Frequency Completed
General Weeds
(nonpoisonous)
Weeds growing in more than 20 percent
of the landscaped area (trees and
shrubs only). See also Thurston County
Noxious weeds list.
Weeds present in less than five percent
of the landscaped area.
General Insect Hazard Any presence of poison ivy or other
poisonous vegetation or insect nests.
No poisonous vegetation or insect nests
present in landscaped area.
General Trash or Litter See Detention Ponds (Checklist #1). See Detention Ponds (Checklist #1).
General Erosion of Ground
Surface
Noticeable rills are seen in landscaped
areas.
Causes of erosion are identified and
steps taken to slow down/spread out the
water. Eroded areas are filled,
contoured, and seeded.
Trees and
shrubs
Damage Limbs or parts of trees or shrubs that
are split or broken which affect more
than 25 percent of the total foliage of the
tree or shrub.
Trim trees/shrubs to restore shape.
Replace trees/shrubs with severe
damage.
Trees and
shrubs
Damage Trees or shrubs that have been blown
down or knocked over.
Tree replanted, inspected for injury to
stem or roots. Replace if severely
damaged.
Trees and
shrubs
Damage Trees or shrubs which are not
adequately supported or are leaning
over, causing exposure of the roots.
Stakes and rubber-coated ties placed
around young trees/shrubs for support.
December 2016 Volume V – Stormwater BMPs C-44
#22 – Maintenance Checklist for Conveyance Systems (Pipes and Ditches):
Drainage
System
Feature
Defect or
Problem
Condition When Maintenance Is
Needed
Results Expected When Maintenance
Is Performed
Maintenance
Frequency Completed
Pipes Sediment &
Debris
Accumulated sediment that exceeds 20
percent of the diameter of the pipe.
Pipe cleaned of all sediment and debris.
Pipes Vegetation Vegetation that reduces free movement
of water though pipes.
Vegetation does not impeded free
movement of water through pipes.
Prohibit use of sand and sealant
application and protect from
construction runoff.
Pipes Damaged
(Rusted, Bent
or Crushed)
Protective coating is damaged: rust is
causing more than 50 percent
deterioration to any part of pipe.
Pipe repaired or replaced.
Pipes Damaged
(Rusted, Bent
or Crushed)
Any dent that significantly impedes flow
(i.e. decreases the cross section area of
pipe by more than 20 percent).
Pipe repaired or replaced.
Pipes Damaged
(Rusted, Bent
or Crushed)
Pipe has major cracks or tears allowing
groundwater leakage.
Pipe repaired or replaced.
Open
Ditches
Trash & Debris Dumping of yard wastes such as grass
clippings and branches. Unsightly
accumulation of non-degradable
materials such as glass, plastic, metal,
foam, and coated paper.
No trash or debris present. Trash and
debris removed and disposed of as
prescribed by the County.
Open
Ditches
Sediment
Buildup
Accumulated sediment that exceeds 20
percent of the design depth.
Ditch cleaned of all sediment and debris
so that it matches design.
Open
Ditches
Vegetation Vegetation (e.g. weedy shrubs or
saplings) that reduces free movements
of water through ditches.
Water flows freely though ditches.
Grassy vegetation should be left alone.
Open
Ditches
Erosion
Damage to
Slopes
Erosion damage over 2 inches deep
where cause of damage is still present
or where there is potential for continued
erosion.
No erosion damage present. Slopes
stabilized using appropriate erosion
control measure(s); e.g., rock
reinforcement, planting of grass,
compaction.
Open
Ditches
Erosion
Damage to
Slopes
Any erosion observed on a compacted
berm embankment.
If erosion is occurring on compacted
berms a professional engineer should
be consulted to resolve source of
erosion.
December 2016 Volume V – Stormwater BMPs C-45
Drainage
System
Feature
Defect or
Problem
Condition When Maintenance Is
Needed
Results Expected When Maintenance
Is Performed
Maintenance
Frequency Completed
Open
Ditches
Rock Lining
Out of Place or
Missing (If
Applicable)
Native soil is exposed beneath the rock
lining.
Rocks replaced to design standards.
If you are unsure whether a problem exists, contact a professional engineer.
December 2016 Volume V – Stormwater BMPs C-46
#23 – Maintenance Checklist for Media Filter Drain.
Drainage
System
Feature
Defect or
Problem
Condition When Maintenance Is
Needed
Results Expected When Maintenance
Is Performed
Maintenance
Frequency Completed
No Vegetation
Zone adjacent
to pavement
Erosion,
Scour, or
Vehicular
Damage
No vegetation zone uneven or clogged
so that flows are not uniformly
distributed.
Area leveled and cleaned so that flows
are spread evenly.
No Vegetation Sediment Flows no longer sheet flowing off of No sediment accumulation on pavement
Zone adjacent Accumulation roadway. Sediment accumulation on edge that impedes sheet flow. Sediment
to pavement on Edge of pavement edge exceeds top of deposits removed such that flows can
Pavement pavement elevation. sheet flow off of roadway.
Vegetated
Filter
Sediment
Accumulation
on Grass
Sediment depth exceeds 2 inches. Sediment deposits removed, slope is re-
leveled so that flows pass evenly
through Ecology Embankment.
Vegetated
Filter
Excessive
Vegetation or
Undesirable
Species
When the grass becomes excessively
tall; when nuisance weeds and other
vegetation starts to take over or shades
out desirable vegetation growth
characteristics. See also Thurston
County Noxious weeds list.
Grass mowed and nuisance vegetation
controlled such that flow not impeded.
Grass should be mowed to a height that
encourages dense even herbaceous
growth.
Vegetated
Filter
Erosion,
Scour, or
Vehicular
Damage
Eroded or scoured areas due to flow
channelization, high flows or vehicular
damage.
No eroded or scoured areas. For ruts or
bare areas less than 12 inches wide,
repair the damaged area by filling with
suitable topsoil. The grass will creep in
over the rock in time. If bare areas are
large, generally greater than 12 inches
wide, the filter strip should be re-graded
and re-seeded. For smaller bare areas,
overseed when bare spots are evident.
Media Bed Erosion,
Scour, or
Vehicular
Damage
Eroded or scoured areas due to flow
channelization, high flows or vehicular
damage.
No eroded or scoured areas. For ruts or
areas less than 12 inches wide, repair
the damaged area by filling with suitable
media. If bare areas are large, generally
greater than 12 inches wide, the media
bed should be re-graded.
Media Bed Sediment
Accumulation
on Media Bed
Sediment depth inhibits free infiltration
of water.
Sediment accumulation does not
impeded infiltration. Sediment deposits
removed and slope is re-leveled so that
flows pass freely through Media Bed.
December 2016 Volume V – Stormwater BMPs C-47
Drainage
System
Feature
Defect or
Problem
Condition When Maintenance Is
Needed
Results Expected When Maintenance
Is Performed
Maintenance
Frequency Completed
Underdrains Sediment Depth of sediment within perforated pipe
exceeds one-half inch.
Depth of sediment within perforated pipe
does not exceed one-half inch. Flush
underdrains through access ports and
collect flushed sediment.
General Trash and
Debris
Accumulation
Any trash and debris accumulations
which exceed one cubic foot per 1,000
square feet. If there is less than the
threshold, remove all trash and debris
as part of the next scheduled
maintenance.
No trash or debris present. Remove
trash and debris from media filter.
General Flows are
Bypassing
Ecology
Embankment
Evidence of significant flows downslope
(rills, sediment, vegetation damage,
etc.) of media filter drain.
Facility functions as designed. Sediment
deposits removed and slope is re-
leveled so that flows pass evenly
through media filter drain. If media filter
drain is completely clogged, it may
require a more extensive repair or
replacement.
General Media Filter
Drain Mix
Replacement
Water is seen on surface of the media
filter drain mix from storms that are less
than the 91st percentile 24-hour rain
event (approx 1.25” in 24 hours).
Maintenance also needed on a 10-year
cycle and during a preservation project.
No water ponded on surface after
design storm. Excavate and replace all
of the media filter drain mix contained
within the media filter drain.
See also the latest version of the WSDOT Highway Runoff Manual for additional maintenance information.
If you are unsure whether a problem exists, contact a professional engineer.
Farrelli’s Yelm September 23, 2021 PAGE 9
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
facilities 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 track maintenance of your storm drainage system.
Although it is not intended for the maintenance survey to involve anything too difficult or strenuous,
there are a few tools that will make the job easier and safer, including:
• A flashlight
• A long 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. There you will find the phone numbers of the
agencies referenced in the tables, as well as the contractors and consultants who designed and
constructed your facilities.
SAFETY WARNING: In keeping with OSHA regulations, you should never stick
your head or any part of your body into a m anhole 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
confined spaces. NO PART OF YOUR BODY SHOULD BREAK THE PLANE OF
THE OPEN HOLE.
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
Thurston County (253) 798-7250
Washington State University (WSU) Cooperative Extension (360) 786-5445
DEVELOPER INFORMATION
Blackrock Industries
1106 39th Ave SE
Puyallup, WA 98374
ENGINEER’S INFORMATION
THE LAND DEVELOPER’S ENGINEERED SOLUTION
a division of The Land Developer, Inc.
PO Box 4420
Tumwater, WA 98501
(360) 250-3973
!
Farrelli’s Yelm September 23, 2021 PAGE 10
Log Sheet
Use log sheets to track maintenance checks and what items, if any, are repaired or altered. Make
copies of this page; use a fresh copy for each inspection. 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 BY:
PHONE NUMBER: ADDRESS:
POSITION ON HOA: CITY, ST ZIP:
PART OF FACILITY
INSPECTED
OBSERVATIONS
(LIST REQUIRED MAINTENANCE
ACTIVITIES) ACTION TAKEN
DATE OF
ACTION
Farrelli’s Yelm September 23, 2021 PAGE 11
II. Chapter 3 – Best Management Practices for
Commercial Properties
THURSTON COUNTY, WASHINGTON
COMMERCIAL
STORMWATER POLLUTION
PREVENTION SOURCE CONTROL
PLAN FOR:
ASSESSOR’S PARCEL NUMBER(S):_____________________________
____________________________________________
ORGANIZATION: _________________________________
ADDRESS: _______________________________________________
_______________________________________________________
DATE PREPARED/UPDATED:__________________________
RESPONSIBLE PERSON:_____________________________________
PHONE/E-MAIL:__________________________________
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i
Table of Contents
1.0 INTRODUCTION................................................................................................................1
1.1 OBJECTIVES OF THIS PLAN.....................................................................................1
1.2 INSTRUCTIONS FOR PREPARING PLAN................................................................1
1.3 ABOUT THIS PLAN.....................................................................................................2
1.4 BEST MANAGEMENT PRACTICES … WHAT ARE THEY? .................................2
1.4.1 SOURCE CONTROL BMPS......................................................................................2
1.4.2 TREATMENT BMPS..................................................................................................3
1.5 WHAT’S IN THIS PLAN?............................................................................................3
2.0 GENERAL PRINCIPLES OF POLLUTION PREVENTION ............................................4
3.0 GENERAL SOURCE CONTROL BMPS...........................................................................7
4.0 SITE / BUSINESS SPECIFIC BMPS..................................................................................9
TABLES
TABLE 1 - GENERAL SOURCE CONTROL BMPS...............................................................7
TABLE 2 - OPERATIONAL SOURCE CONTROL PRACTICES SUMMARY...................10
ATTACHMENTS
ATTACHMENT A – COMMERCIAL AND INDUSTRIAL ACTIVITIES WORKSHEET
ATTACHMENT B – ACTIVITY SHEETS
ATTACHMENT C – SPILL CONTROL PLAN
ATTACHMENT D – INTEGRATED PEST MANAGEMENT PLAN
ATTACHMENT E – ANNUAL REPORT CHECKLIST
ATTACHMENT F – QUICK REFERENCE PHONE NUMBERS AND WEB SITES
ii
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1
1.0 Introduction
1.1 OBJECTIVES OF THIS PLAN
1. To implement and maintain best management practices (BMPs) that identify, reduce, eliminate
and/or prevent the discharge of stormwater pollutants.
2. To prevent violations of surface water quality, groundwater quality, and sediment management
standards.
3. To eliminate the discharges of un-permitted process wastewater, domestic wastewater, non-contact
cooling water and other illicit discharges to stormwater drainage systems.
1.2 INSTRUCTIONS FOR PREPARING PLAN
To customize this plan for your property/business do the following:
1. Complete the cover page with information on your information.
2. Complete the worksheet included in Attachment A by selecting those activities that apply
to your property/business.
3. Copy and include in Attachment B the applicable activity sheets based on the activities
selected in step 2. Copy the applicable pages of Chapter 4, Volume IV of the Thurston
County Drainage Design and Erosion Control Manual that address the activities selected in
step 2.
4. Complete Table 2 (Operational Source Control Practices Summary) in Section 4.0
referencing the applicable activity sheets from step 3. Indicate for each activity the required
and recommended operational BMPs applicable to your business.
5. If an Emergency Spill Control Plan (SPC) is required, include it as Attachment C. This
may be required for some business types. Prepare the plan using the appropriate guidance for
your business practices (i.e. fueling, chemical handling, etc.).
6. If an Integrated Pest Management Plan (IPM) is required, include it as Attachment D. If
one of your required BMPs is the use of an Integrated Pest Management Plan, prepare the plan
using the appropriate guidance and include it as Attachment D.
7. Customize the Annual Report checklist included in Attachment E. This checklist needs to
be completed and submitted with the Annual Report required as part of your Stormwater
Agreement with Thurston County. If your business/property is not subject to a Stormwater
Agreement, this checklist can be used internally to perform routine audits of your source
control program.
2
1.3 ABOUT THIS PLAN
All commercial and industrial properties and activities, including multi-family residential complexes
(i.e. apartments, condominiums), non-residential special uses, and government facilities in
unincorporated Thurston County that have the potential to contribute pollutants to stormwater runoff
or directly to receiving waters are required to implement stormwater pollution prevention source
control measures. Stormwater runoff may seep into the ground, drain to a storm drain or a drainage
ditch, or flow over the ground. Regardless of the way runoff leaves your site, it ends up in a stream
river, lake, wetland, groundwater or Puget Sound.
All known, available and reasonable source control BMPs shall be applied. Source control BMPs shall
be selected, designed, and maintained in accordance with Volume IV of the Thurston County
Drainage Design and Erosion Control Manual.
Many people believe that stormwater runoff is “clean” and does not harm water quality. This
perception is understandable since the amount of pollution from any one place is not usually
significant by itself. But when all these small amounts are combined, they can cause significant
pollution problems. Contaminated stormwater can negatively affect every water body it enters.
Therefore, this plan provides detailed information to reduce the contamination of surface water,
groundwater, and stormwater from the property and/or business.
The federal Clean Water Act mandates that cities and counties control the quality of stormwater
runoff. One way to achieve this is to implement pollution prevention measures on individual
properties. By following the “Best Management Practices” for your business as described in this plan
you can do your part to protect our streams, groundwater, and Puget Sound.
1.4 BEST MANAGEMENT PRACTICES … WHAT ARE THEY?
Best Management Practices (BMPs) are a set of activities designed to reduce stormwater pollution.
BMPs are separated into two broad categories: source control and treatment. Applicable BMPs for
your business can be selected from the most recent published edition of the Thurston County Drainage
Design and Erosion Control Manual, Volume IV, “Source Control.”
1.4.1 Source Control BMPs
Source control BMPs prevent contaminants from
entering stormwater by controlling them at the source.
Source control BMPs prevent contaminants from entering stormwater runoff by controlling them at
the source. Some source control BMPs are operational, such as checking regularly for leaks and drips
from equipment and vehicles, covering materials that have potential to add pollutants to surface water
if rainwater comes in contact with the materials, and minimizing use of pesticides, fertilizers, and
insecticides. Other source control BMPs require use of a structure to prevent rainwater from
contacting materials that will contaminate stormwater runoff such as providing a covered area or berm
to prevent clean stormwater from entering work or storage areas.
3
1.4.2 Treatment BMPs
In contrast, treatments BMPs are structures that treat stormwater to remove contaminants. Treatment
BMPs typically require planning, design and construction. A stormwater treatment pond is an
example of a treatment BMP. No treatment BMP is capable of removing 100 percent of the
contaminants in stormwater and the less contaminants in the stormwater the more effective the
treatment BMP is.
Just because there is a stormwater collection system serving your property, it does not necessarily
mean that the stormwater is treated. Many sites were developed prior to requirements to treat
stormwater. Runoff from your property may go directly or indirectly to a stream or wetland without
any treatment.
Keep in mind that runoff from your property may go directly
or indirectly to a stream or wetland without any treatment.
This plan focuses on source control BMPs applicable to the routine practices of your business.
1.5 WHAT’S IN THIS PLAN?
This plan should be customized for your business. If you are trying to get a building permit you may
be required to submit a copy of this plan, or its equivalent as part of your permit application and then
record it with the Thurston County Auditor’s office prior to receiving final approval of your project.
The plan is divided into sections as follows:
Introduction
General Principles of Pollution Prevention
Operational BMPs Applicable to All Facilities
Site/Business Specific BMPs
Attachments
o A – Commercial and Industrial Activities Worksheet
o B – Applicable Facility Activity Sheets
o C – Spill Control Plan (If applicable)
o D – Integrated Pest Management Plan (If applicable)
o E – Annual Report Checklist
o F – Quick Reference Phone Numbers and Web Sites
4
2.0 General Principles of Pollution Prevention
There are 15 general principles of pollution prevention
that every business owner should consider.
This section describes the 15 general principles of pollution prevention that every business owner
should consider. Most of these are common sense, “housekeeping” types of solutions.
1. Avoid the activity or reduce its occurrence
Avoid potentially polluting activity or do it less frequently. Apply lawn care chemicals following
directions and only as needed. Do not apply herbicides right before it rains.
2. Move the activity indoors
Move a potentially polluting activity indoors out of the weather. This prevents runoff contamination
and provides more control for a cleanup if a spill occurs.
3. Cleanup spills quickly
Promptly contain and cleanup solid and liquid pollutant leaks and spills on exposed soil, vegetation,
or paved areas. Use readily available absorbents such as kitty litter to absorb spills and then sweep
up the material and dispose of it properly. Repair leaks on vehicles and equipment.
4. Use less material
Don’t buy or use more material than you really need. This not only helps keep potential disposal,
storage and pollution problems to a minimum, but will probably save you money.
5. Use the least toxic materials available
Investigate the use of materials that are less toxic. For example, replace a caustic-type detergent or
solvent with a more environmentally friendly product. If you do switch to a biodegradable product,
remember that only uncontaminated water is allowed to enter the stormwater drainage system.
Only uncontaminated water is allowed to enter the
stormwater drainage system.
5
6. Create and maintain vegetated areas near activity locations
Vegetation can filter pollutants out of stormwater. Route stormwater from parking and work areas
through vegetated areas. Remember that wastewater other than stormwater runoff, such as wash
water, must be discharged to a wastewater collection system (sewer or septic system).
7. Locate activities as far as possible from surface drainage paths
Locate activities away from storm drains, ditches, streams, and other water bodies to reduce the
potential to pollute. It will take longer for material to reach the drainage features providing more time
to react to a spill, or “housekeeping” issue and protect local waters long enough to cleanup.
8. Maintain stormwater drainage systems
Pollutants concentrate over time in catch basins, ditches, and storm drains. When a storm event
occurs, turbulent runoff can mobilize these pollutants and carry them to receiving waters. Perform
regular maintenance on stormwater facilities to prevent this from occurring.
9. Reduce, reuse, and recycle as much as possible
Look for ways to recycle. This saves money and keeps hazardous and non-hazardous materials out of
landfills. Contact the Thurston County Solid Waste Division at (360) 357-2491 for more information
on recycling opportunities at the Thurston County Waste and Recover Center.
10. Be an advocate for stormwater pollution prevention
Help friends, neighbors, and business associates find ways to reduce stormwater pollution in their
activities. Most people want clean water and do not pollute intentionally. Share your ideas and the
BMPs in this plan to get them thinking about how their everyday activities affect water quality.
11. Report problems
We all must do our part to protect water, fish, wildlife, and our own health by implementing proper
BMPs, and reporting water quality problems that we observe. Call the Thurston County Stormwater
Utility at (360) 754-4681 to report dumping to storm drains or ditches.
12. Provide oversight and training
Talk to your employees, or if you are a landlord talk to your tenants, to ensure they understand the
pollution prevention source control measures and BMPs described in this plan. If you are a landlord,
you are still responsible for the activities of your tenants. Monitor the activities of your tenants to
ensure that they are carrying out the principles of this plan.
Do not hose down pollutants from any area to the ground, storm
drain, conveyance ditch or any receiving water (stream, wetland,
lake, etc.)
6
13. Dust control
Sweep parking and storage areas regularly to collect and dispose of dust and debris that could
contaminate stormwater. Do not hose down pollutants from any area to the ground, storm drain,
conveyance ditch or any receiving water (stream, wetland, lake, etc.). Do not use oil or other
petroleum products for dust control. Only light watering of dirt or gravel roads or parking areas
should be conducted to prevent any runoff of stormwater from the surface.
14. Eliminate illicit connections
Occasionally businesses have internal building drains, sump overflows, sump pumps, outdoor sinks
and showers, and even sanitary sewer and septic system pipes that were inadvertently connected to the
storm drainage system in the past.
Examine the plumbing system for your business to determine if illicit connections exist. Toilets, sinks,
appliances, showers, bathtubs, floor drains, industrial process waters, and other indoor activities found
to be connected to the stormwater drainage system must be immediately rerouted to the sanitary sewer
or septic system, holding tanks, or process treatment system. For assistance in methods to detect and
eliminate illicit connections contact the Thurston County Stormwater Utility at (360) 754-4681.
15. Dispose of waste properly
Every business and residence in Thurston County must dispose of solid and liquid wastes and
contaminated stormwater properly. There are generally four options for disposal depending on the
type of materials. These options include:
Sanitary sewer and septic systems.
Recycling facilities
Municipal solid waste disposal facilities
Hazardous waste treatment, storage and disposal facilities.
Do not use oil or other petroleum products for dust control. Only
light watering of dirt or gravel roads or parking areas should be
conducted to prevent runoff…
7
3.0 General Source Control BMPs
This section briefly summarizes source control BMPs that are generally applicable to all types of sites.
In the next section BMPs specific to your business will be identified. In some cases the Activity Sheet
will reference the BMPs in this section. In that case the Thurston County Drainage Design and
Erosion Control Manual, Volume IV, Chapter 5, should be referenced for more detail on these general
source control BMPs.
TABLE 1: GENERAL SOURCE CONTROL BMPS
BMP
CATEGORY DESCRIPTION √
S.1
Eliminate Illicit
Stormwater
Drainage System
Connections
1. Use building and site plans and examine plumbing systems to
determine if illegal connections exist.
2. Consider dye testing to determine where a pipe or structure drains.
3. Consider smoke testing (best done by qualified professional).
4. Contact Thurston County (360) 754-4681 for assistance.
5. Plug, disconnect or reroute to sewer/septic system any drains found
connected to the stormwater drainage system.
S.2
Dispose of
Collected Runoff
and Waste
Materials
Properly
1. Discharge liquid wastes and contaminated stormwater to the sanitary
sewer – contact LOTT or local sewer provider for restrictions.
2. Use sumps or holding tanks for temporary storage.
3. Consider recycling materials where feasible.
4. Dispose of solid wastes to Thurston County WARC.
5. Dispose of dangerous or hazardous wastes at permitted facility.
6. Contact Thurston County for disposal options (360)754-4581.
S.3
Connect Process
Water
Discharges to
Sanitary Sewer,
Holding Tank, or
Water Treatment
System
1. Required for all industrial and commercial activities that generate
contaminated process wastewater.
2. Discharge to sanitary sewer - contact LOTT or local sewer provider
for restrictions.
2. Discharge to sumps or holding tanks for temporary storage – have
tanks pumped for proper disposal.
3. Construct wastewater treatment system – contact Ecology for
permitting requirements.
4. If activity is conducted outdoors cover the activity and/or construct
curbs, dikes or berms to prevent stormwater run-on.
S.4
Cover the
Activity with a
Roof or Awning
1. Construct simple roof or awning to prevent contact with stormwater.
2. Contact Thurston County for information on permits-(360) 786-5490.
3. The area of roof cover should be sufficient to prevent precipitation
from reaching the covered materials.
8
BMP
CATEGORY DESCRIPTION √
S.5
Cover the
Activity with an
Anchored
Tarpaulin or
Plastic Sheet
1. Use where raw materials are stockpiled outdoors.
2. Use weights such as bricks, tires, or sandbags to anchor the cover.
3. Use pins or stakes to anchor tarpaulin to the ground.
4. Locate stockpile to provide wind protection (leeward side of buildings,
landscaping, etc.)
5. Inspect daily.
S.6
Pave the Activity
Area and Slope
to a Sump or
Holding Tank
1. Apply to activities that cannot be covered adequately but that may be
susceptible to spills such as chemical storage areas.
2. Enclose area within a dike, curb or berm.
3. Provide a sump or holding tank to contain spills until the liquids can
be pumped out and disposed properly.
4. Ensure paving is compatible with stored material, e.g. gasoline can
breakdown asphalt – use concrete paving.
S.7
Surround the
Activity Area with
a Curb, Dike, or
Berm or elevate
the Activity
1. Containment is most applicable to spill control situations.
2. If used to prevent run-on to a covered activity area place the berm
underneath the covering so rain water will not pond inside it.
3. Size containment area for 6-month storm unless other containment
sizing restrictions apply.
4. Install a valve in storm drainage line from area so that excess clean
stormwater can be drained from area.
5. For storage of small items, consider a tub, wading pool, or specially
manufactured containment systems.
6. For spill control the volume of the containment should be the greater
of either 110% of the volume of the largest tank, or 10% of the volume
of all tanks if there are multiple tanks.
S.8
Implement
Integrated Pest
Management
Measures
1. IPM may be required by Thurston County Code.
2. Commercial, agricultural, municipal and other large scale pesticide
users should adhere to integrated pest management principles.
3. Guidance information is available from Thurston County
Environmental Health, the Washington State Department of Agriculture
and Washington State University Extension Service.
4. If an IPM plan is required, include as Attachment D.
S.9
Clean Catch
Basins
1. Catch basins should be cleaned regularly.
2. Several companies offer catch basin cleaning services; check the
yellow pages under “sewer cleaning equipment and supplies.” A list of
local service providers is available at:
www.co.thurston.wa.us/stormwater/facilities/facilities-contractors.html
3. Do not flush catch basin sumps into the catch basin outlet pipe.
4. Check your stormwater Maintenance Plan for additional information
on catch basin cleaning frequency and inspection requirements.
9
4.0 Site / Business Specific BMPS
Every business in Thurston County is required to use the
BMPs described in the Thurston County Drainage
Manual to control stormwater pollution.
Table 2 (following pages) should be completed and include a list of all activities identified on the
worksheet (Attachment A). Review the applicable Activity Sheet (should be included in Attachment
B) and summarize those required and suggested BMPs or actions that are appropriate for your
property/ business. This table should be posted in an appropriate location for employees to see.
[THIS AREA INTENTIONALLY BLANK]
10
[INSERT BUSINESS NAME]
TABLE 2 – OPERATIONAL SOURCE CONTROL PRACTICES SUMMARY
[Note: A1.1 is listed as an example. Complete similar entries for all applicable activities. Add or
delete rows to table as necessary to complete table. ]
ACTIVITY SOURCE CONTROL BMPS
(SEE ACTIVITY SHEET IN ATTACHMENT B FOR MORE INFORMATION)
√
A1.1
Cleaning or
Washing Tools,
Engines, and
Manufacturing
Equipment
Required Practices:
1. Eliminate illicit connections to storm drain system
2. Train employees to control washing operations
3. Washwater should never discharge to stormwater system
4. Pressure wash only in designated area provided with sump drain
Suggested Practices:
1. Use least toxic cleaner capable of doing the job.
2. Limit amount of water used
3. Recycle washwater if possible
11
ACTIVITY SOURCE CONTROL BMPS
(SEE ACTIVITY SHEET IN ATTACHMENT B FOR MORE INFORMATION)
√
12
ACTIVITY SOURCE CONTROL BMPS
(SEE ACTIVITY SHEET IN ATTACHMENT B FOR MORE INFORMATION)
√
ACTIVITIES WORKSHEET A-1
ATTACHMENT A
COMMERCIAL AND INDUSTRIAL ACTIVITIES
WORKSHEET
This worksheet and the associated BMPs are organized by business activity. The goal of BMPs is to
ensure that only uncontaminated stormwater is discharged into any stormwater drainage system.
Complete the entire worksheet by checking the appropriate boxes for all activities that occur at your
work place. If you checked off any of the activities that are being performed outdoors or can drain
to the stormwater drainage system, use the activity code on the worksheet to find the BMPs
recommended for you in Chapter 4 of Volume IV of the Thurston County Drainage Design and
Erosion Control Manual. If you perform an activity indoors and control all discharges from the
activity (e.g., process water, washwater, lubricants, solvents, fugitive dust, granular material, blow
down waste) so that no stormwater exposure occurs, you do not have to institute BMPs for that
activity.
If you have questions, please contact the Thurston County Stormwater Utility at (360) 754-4681.
They can provide assistance over the phone and also at your business site.
Check if You Are
Involved in This Activity
Code Type of Activity Indoor Outdoor
A1.1 Cleaning or Washing of Tools, Engines, and Manufacturing
Equipment
Includes parts washers and all types of manufactured
equipment components.
A1.2 Cleaning or Washing of Cooking Equipment
Includes vents, filters, pots and pans, grills, and related
items.
A1.3 Washing, Pressure Washing, and Steam Cleaning of
Vehicles/Equipment/Building Structures
Includes cleaning and washing at all types of establishments,
including fleet vehicle yards, car dealerships, car washes,
and maintenance facilities.
A1.4 Collection and Disposal of Wastewater from Mobile Interior Washing
Operations
Includes carpet cleaners, upholstery cleaners, and drapery
cleaners.
A2.1 Loading and Unloading Areas for Liquid or Solid Material
Includes raw materials, intermediate products, finished
products, waste, or fuel.
ACTIVITIES WORKSHEET A-2
Check if You Are
Involved in This Activity
Code Type of Activity Indoor Outdoor
A2.2 Fueling at Dedicated Stations
Includes gas stations, pumps at fleet vehicle yards or shops,
and other privately owned pumps.
A2.3 Engine Repair and Maintenance
This covers oil changes and other engine fluids.
A2.4 Mobile Fueling of Vehicles and Heavy Equipment
Includes fleet fueling, wet fueling, and wet hosing.
A3.1 Concrete and Asphalt Mixing and Production at Stationary Sites
Applies to mixing of raw materials on site to produce
concrete or asphalt.
A3.2 Concrete Pouring, Concrete Cutting, and Asphalt Application at
Temporary Sites
Includes construction sites, and driveway and parking lot
resurfacing.
A3.3 Manufacturing and Post-processing of Metal Products
Includes machining, grinding, soldering, cutting, welding,
quenching, rinsing, etc.
A3.4 Wood Treatment Areas
Includes wood treatment using pressure processes or by
dipping or spraying.
A3.5 Commercial Composting
Includes commercial composting facilities operating outside.
A3.6 Landscaping and Vegetation Management Activities, Including
Vegetation Removal, Herbicide and Insecticide Application, Fertilizer
Application, Irrigation, Watering, Gardening, and Lawn Care
Includes businesses involved in landscaping, applying
pesticides and managing vegetation.
A3.7 Painting, Finishing, and Coating of Vehicles, Boats, Buildings, and
Equipment
Includes surface preparation and the applications of paints,
finishes, and/or coatings.
A3.8 Commercial Printing Operations
Includes materials used in the printing process.
A3.9 Manufacturing Activities – Outside
Includes outdoor manufacturing areas.
A3.10 Agricultural Crop Production
Includes commercial scale farming.
A3.11 Application of Pesticides, Herbicides, Fungicides and Rodenticides
for purposes other than landscaping
Includes moss removal and outdoor insect extermination.
ACTIVITIES WORKSHEET A-3
Check if You Are
Involved in This Activity
Code Type of Activity Indoor Outdoor
A4.1 Storage or Transfer (Outside) of Solid Raw Materials, By-products, or
Finished Products
A4.2 Storage and Treatment of Contaminated Soils
This applies to contaminated soils that are excavated and left
on site.
A4.3 Temporary Storage or Processing of Fruits or Vegetables
Includes processing activities at wineries, fresh and frozen
juice makers, and other food and beverage processing
operations.
A4.4 Storage of Solid Wastes and Food Wastes
Includes regular garbage and all other discarded non-liquid
items.
A4.5 Recyclers and Scrap Yards
Includes scrapped equipment, vehicles, empty metal drums,
and assorted recyclables.
A4.6 Treatment, Storage, or Disposal of Dangerous Wastes
Refer to Ecology and the Thurston County Health
Department for more information, see Chapter 7.
A4.7 Storage of Liquid, Food Waste, or Dangerous Waste Containers
Includes containers located outside a building and used for
temporary storage.
A4.8 Storage of Liquids in Permanent Aboveground Tanks
Includes all liquids in aboveground tanks.
A4.9 Parking and Storage for Vehicles and Equipment
Includes public and commercial parking lots
A4.10 Storage of Pesticides, Fertilizers, or other products that can leach
pollutants
A5.1 Demolition of Buildings
Applies to removal of existing buildings and subsequent
clearing of the rubble.
A5.2 Building Repair, Remodeling, and Construction
Applies to construction of buildings, general exterior building
repair work and remodeling of buildings.
A6.1 Dust Control at Disturbed Land Areas and Unpaved Roadways and
Parking Lots
A6.2 Dust Control at Manufacturing Sites
Includes grain dust, sawdust, coal, gravel, crushed rock,
cement, and boiler fly ash.
ACTIVITIES WORKSHEET A-4
Check if You Are
Involved in This Activity
Code Type of Activity Indoor Outdoor
A6.3 Soil Erosion and Sediment Control (ESC) at Industrial Sites
Includes industrial activities that take place on soil.
A7.1 Commercial Animal Handling Areas
Includes kennels, fenced pens, veterinarians, and
businesses that board animals.
A7.2 Keeping Livestock in Stables, Pens, Pastures or Fields
Applies to all types of livestock.
A7.3 Log Sorting and Handling
Applies to log yards typically located at sawmills, ports, and
pulp mills.
A7.4 Boat Building, Mooring, Maintenance, and Repair
Includes all types of maintenance, repair, and building
operations.
A7.5 Logging
Applies to logging activities that fall under Class IV general
forest practices.
A7.6 Mining and Quarrying of Sand, Gravel, Rock, Minerals, Peat, Clay,
and Other Materials
This does not include excavation at construction sites.
A7.7 Swimming Pool and Spa Cleaning and Maintenance Includes every swimming pool and spa not at a single family
residence. Commercial pool cleaners are included here for
all pools.
A7.8 De-icing and Anti-icing Operations for Airports and Streets
Includes aircraft, runways/taxiways, streets and highways.
A7.9 Roof and Building Drains at Manufacturing and Commercial Buildings
These sites will be referred to ORCAA.
A7.10 Urban Streets
BMPs for addressing pollutants found on paved surfaces,
including street sweeping.
A7.11 Railroad Yards
A7.12 Maintenance of Public and Private Utility Corridors and Facilities
Includes public and private utility maintenance activities.
A7.13 Maintenance of Roadside Ditches
A7.14 Maintenance of Stormwater Drainage and Treatment Facilities
A7.15 Spills of Oil and Hazardous Substances
ACTIVITY SHEETS B-1
ATTACHMENT B
ACTIVITY SHEETS
Best Management Practices for Commercial and Industrial Activities
This Attachment coordinates with the worksheet in Attachment A. That worksheet and the BMPs are
organized by the different activities that businesses perform. If you checked the column for activities
performed outdoors, match the number from the worksheet to the activities listed in Volume IV,
Chapter 4 of the Thurston County Drainage Design and Erosion Control Manual to find the suggested
BMPs you should implement. Make photocopies of the applicable Activity Sheets and insert them in
this section. Use the Activity Sheets to prepare a summary of the applicable required and suggested
BMPs for inclusion in Table 2 (Section 4).
Explanation of Required BMPs
Every business in Thurston County is required to use the BMPs described in the Thurston
County Drainage Design and Erosion Control Manual to control stormwater pollution. In some
instances, there are BMPs mandated by various federal, state, or county laws. If you are subject to
those laws and regulations via another permit or formal regulatory approval, you are encouraged, but
not required to use additional BMPs to further protect water quality.
The BMPs outlined in this section are focused on source control: that is, methods to prevent pollution
from reaching stormwater in the first place. The use of source control BMPs is always the first line of
defense in stormwater pollution prevention.
ACTIVITY SHEETS B-2
[ATTACH APPLICABLE ACTIVITY SHEETS PHOTO
COPIED FROM THE THURSTON COUNTY DRAINAGE
DESIGN AND EROSION CONTROL MANUAL,
VOLUME V, SECTION 4]
SPILL CONTROL PLAN C-1
ATTACHMENT C
SPILL CONTROL PLAN
[NOTE: IF REQUIRED, ATTACH THE COMPLETED SPILL CONTROL PLAN]
SPILL CONTROL PLANNING GUIDANCE
If required to prepare and implement an Emergency Spill Cleanup Plan follow the appropriate guidance
required for your activity. General guidelines for implementing an Emergency Spill Cleanup Plan include:
Prepare an Emergency Spill Control Plan (SCP), which includes:
o A description of the facility including the owner's name and address and the name of
the designated person with spill cleanup and notification responsibility.
o The nature of the activity at the facility;
o The general types of chemicals used or stored at the facility;
o A site plan showing the location of storage areas for chemicals, the locations of storm
drains, the areas draining to them, and the location and description of any devices to
stop spills from leaving the site such as positive control valves;
o Cleanup procedures;
o Notification procedures to be used in the event of a spill, such as notifying key
personnel, the fire department, Ecology, State Patrol, and the local Sewer Authority.
Train key personnel. Prepare a summary of the plan and post it at appropriate points in the
building, identifying the spill cleanup coordinators, location of cleanup kits, and phone
numbers of regulatory agencies to be contacted in the event of a spill;
Update the SCP regularly;
Immediately notify Ecology and the local Sewer Authority if a spill may reach sanitary or
storm sewers, ground water, or surface water, in accordance with spill reporting requirements;
Immediately clean up spills. Do not use emulsifiers unless an appropriate disposal method for
the resulting oily wastewater is implemented. Absorbent material shall not be washed down a
floor drain or storm sewer; and,
Locate emergency spill containment and cleanup kit(s) in high potential spill areas. The
contents of the kit shall be appropriate for the type and quantities of chemical liquids stored at
the facility.
Spill Kit Contents: Spill kits should include appropriately lined drums, absorbent pads, and
granular or powdered materials for neutralizing acids or alkaline liquids where applicable. In
fueling areas: absorbent should be packaged in small bags for easy use and small drums should be
available for storage of absorbent and/or used absorbent. Spill kits should be deployed in a manner
that allows rapid access and use by employees.
SPILL CONTROL PLAN C-2
[ATTACH SPILL CONTROL PLAN]
INTEGRATED PEST MANAGEMENT D-1
ATTACHMENT D
INTEGRATED PEST MANAGEMENT PLAN
[NOTE: IF YOU ARE REQUIRED TO PREPARE AN INTEGRATED PEST MANAGEMENT
PLAN ATTACH THE COMPLETED PLAN TO THIS SECTION]
INTEGRATED PEST MANAGEMENT GUIDANCE
Integrated Pest and Vegetation Management (IPM) is a natural, long-term, ecologically-based systems
approach to controlling pest populations. IPM is used to reduce pest populations, maintain them at
levels below those causing health concerns or economic damage. The goals of IPM are to both
encourage optimal selective pesticide use (away from prophylactic, broad spectrum use), and to
maximize natural controls to minimize environmental side effects.
Thurston County requires Integrated Pest Management Plans for certain land use projects located in
Category I or II Aquifer Recharge Areas, where drinking water sources are vulnerable to
contamination. These include:
1. Subdivisions of 10 lots or greater (excluding large lots).
2. Any land use project that incorporates maintained open space totally more than five acres.
3. All land use projects located within a delineated wellhead capture zone for a Group A public
water supply.
For more information on Thurston County’s IPM policy, visit the County web site at:
http://www.co.thurston.wa.us/health/ehipm/index.html
Introduction
True integrated pest and vegetation management is a powerful approach that anticipates and prevents
most problems through appropriate cultural practices and careful observation. Knowledge of the life
cycles of host plants and both beneficial and pest organisms is also important. The integrated pest
management section of this guidance is adapted from Least Toxic Pest Management for Lawns by
Sheila Daar. Following the integrated pest management process gives you the information you need to
minimize damage by weeds, diseases, and pests and to treat those problems with the least toxic
approaches.
INTEGRATED PEST MANAGEMENT D-2
The IPM Process
Step One: Correctly identify problem pests and understand their life cycle.
Learn more about the pest. Observe it and pay attention to any damage that may be occurring. Learn
about the life cycle. Many pests are only a problem during certain seasons, or can only be treated
effectively in certain phases of the life cycle.
Step Two: Establish tolerance thresholds for pests.
Every landscape has a population of some pest insects, weeds, and diseases. This is good because it
supports a population of beneficial species that keep pest numbers in check. Beneficial organisms
may compete with, eat, or parasitize disease or pest organisms. Decide on the level of infestation that
must be exceeded before treatment needs to be considered. Pest populations under this threshold
should be monitored but don’t need treatment. For instance, European crane flies usually don’t do
serious damage to a lawn unless there are 25 to 40 larvae per square foot feeding on the turf in
February (in normal weather years). Also, most people consider a lawn healthy and well maintained
even with up to 20 percent weed cover, so treatment, other than continuing good maintenance
practices, is generally unnecessary.
Step Three: Monitor to detect and prevent pest problems.
Regular monitoring is a key practice to anticipate and prevent major pest outbreaks. It begins with a
visual evaluation of the lawn or landscape's condition. Take a few minutes before mowing to walk
around and look for problems. Keep a notebook, record when and where a problem occurs, then
monitor for it at about the same time in future years. Specific monitoring techniques can be used in
the appropriate season for some potential problem pests, such as European crane fly.
Step Four: Modify the maintenance program to promote healthy plants and discourage pests.
A healthy landscape is resistant to most pest problems. Lawn aeration and over-seeding along with
proper mowing height, fertilization, and irrigation will help the grass out-compete weeds. Correcting
drainage problems and letting soil dry out between waterings in the summer may reduce the number of
crane-fly larvae that survive.
Step Five: If pests exceed the tolerance thresholds …
Use cultural, physical, mechanical, or biological controls first. If those prove insufficient, use the
chemical controls described below that have the least non-target impact. When a pest outbreak strikes
(or monitoring shows one is imminent), implement integrated pest management then consider control
options that are the least toxic, or have the least non-target impact. Here are two examples of an
integrated pest management approach:
1. Red thread disease is most likely under low nitrogen fertility conditions and most
severe during slow growth conditions. Mow and bag the clippings to remove diseased
blades. Fertilize lightly to help the grass recover, then begin grasscycling and change
to fall fertilization with a slow-release or natural-organic fertilizer to provide an even
INTEGRATED PEST MANAGEMENT D-3
supply of nutrients. Chemical fungicides are not recommended because red thread
cannot kill the lawn.
2. Crane fly damage is most prevalent on lawns that stay wet in the winter and are
irrigated in the summer. Correct the winter drainage and/or allow the soil to dry
between irrigation cycles; larvae are susceptible to drying out, so these changes can
reduce their numbers. It may also be possible to reduce crane fly larvae numbers by
using a power de-thatcher on a cool, cloudy day when feeding is occurring close to the
surface. Studies are being conducted using beneficial nematodes that parasitize the
crane fly larvae; this type of treatment may eventually be a reasonable alternative.
Only after trying suitable non-chemical control methods or determining that the pest outbreak is
causing too much serious damage, should chemical controls be considered. If chemical controls prove
necessary, determine what products are available and choose a product that is the least toxic and has
the least non-target impact. Refer to the operational BMPs for the use of pesticides below for
guidelines on choosing, storing, and using lawn and garden chemicals.
Step Six: Evaluate and record the effectiveness of the control, and modify maintenance practices to
support lawn or landscape recovery and prevent recurrence.
Keep records! Note when, where, and what symptoms occurred, or when monitoring revealed a
potential pest problem. Note what controls were applied and when, and the effectiveness of the
control. Monitor next year for the same problems. Review your landscape maintenance and cultural
practices to see if they can be modified to prevent or reduce the problem.
A comprehensive integrated pest management program should also include the proper use of
pesticides as a last resort, and vegetation/fertilizer management to eliminate or minimize the
contamination of stormwater.
INTEGRATED PEST MANAGEMENT D-4
[ATTACH INTEGRATED PEST MANAGEMENT PLAN]
ANNUAL REPORT CHECKLIST E-1
ATTACHMENT E
ANNUAL REPORT CHECKLIST
ANNUAL REPORT CHECKLIST E-2
SOURCE CONTROL ANNUAL REPORT CHECKLIST
Your stormwater pollution prevention plan should be reviewed at least annually and updated as
required. The following checklist should be completed and submitted to Thurston County along with
the annual report required as part of your Stormwater Maintenance Agreement with Thurston County.
If your project did not require a Stormwater Maintenance Agreement and Maintenance Plan then
submittal of this annual report is not required. If submittal is required it should be mailed or hand
delivered to: Thurston County Stormwater Utility; 929 Lakeridge Drive SW, Bldg 4, Room 100;
Olympia, Washington 98502.
BUSINESS NAME:
ADDRESS:
ASSESSOR’S PARCEL NUMBER:
COMPLETED BY:
SIGNATURE:
DATE:
√ ACTIVITY NOTES
Review Activity Checklist (Attachment A) –
Verify still current. List any new activities.
Review and Update Attachment B if new
activities are identified.
Review and Update Table 2 for New Activities
ANNUAL REPORT CHECKLIST E-3
√ ACTIVITY NOTES
Was any employee training held? If so describe.
Review Table 2 and verify compliance. Attach
copy indicating each item has been checked.
Describe any significant events such as spills,
illicit discharges detected/fixed, etc.
Was catch basin cleaning conducted? If so
when, and by what company.
Conduct visual inspection of property for
evidence of leaks, improper operations, etc.
Note any items requiring attention.
Is a copy of Table 2 posted where visible to
employees?
ANNUAL REPORT CHECKLIST E-4
√ ACTIVITY NOTES
Have any additional structural or treatment
BMPs been implemented on the site since the
last annual report was submitted? If so describe.
Any other items related to stormwater source
control not noted above? Describe.
Do you desire any technical assistance from
Thurston County related to stormwater issues?
If so, indicate contact person and phone
number.
F-1
ATTACHMENT F
QUICK REFERENCE PHONE NUMBERS AND WEB SITES
PHONE NUMBERS
Environmental Protection Agency (U.S. EPA) – Region X 800-424-4372
Thurston County:
Stormwater Utility 360-754-4681
Department of Public Works 360-754-4581
After-hours water and sewer emergencies (paging service) 800-926-7761
Thurston County Waste Line (automated information) 360-786-5494
LOTT Alliance Industrial Pretreatment Program 360-528-5708
Development Services – Permits 360-786-5490
Weed Control/ Noxious Chemical Use 360-786-5576
Thurston County Public Health and Social Services Department:
On-Site Sewage 360-754-3355 x 6518
Asbestos Removal 360-786-5461
Hazardous Waste Section 360-786-5457
Solid Waste 360-786-5461
University of Washington Center for Urban Water Resources 206-543-6272
Washington State Department of Agriculture 360-902-2010
877-301-4555
Washington State Department of Ecology 360-407-6000
Southwest Regional Office 360-407-6300
Dangerous/Hazardous Waste 360-407-6300
NPDES Stormwater or Wastewater Permits 360-407-6400
Spill Reporting 800-424-8802
Recycling 800-732-9253
Groundwater Quality and Protection 360-407-6400
Underground and Aboveground Storage Tanks 360-407-7170
Washington State University/Thurston County Cooperative Extension 360-867-2151
Industrial Materials Exchange 206-296-4899
Nisqually Tribe 360-456-5221
Confederated Tribes of the Chehalis 360-273-5911
Olympic Region Clean Air Agency (ORCAA) 800-422-5623
Underground Utility Locate “Call Before You Dig” 800-424-5555
F-2
WEB PAGES
Washington State Departments:
Washington State Department of Health
<http://www.doh.wa.gov/>
Washington Department of Fish and Wildlife
<http://wdfw.wa.gov/>
Washington State Government Information and Services
<http://www.access.wa.gov/>
Washington State Department of Ecology – Flood Information
<http://www.ecy.wa.gov/programs/sea/floods/>
Washington State Department of Ecology - Digital Coastal Atlas
<http://www.ecy.wa.gov/programs/sea/SMA/atlas_home.html>
Washington State Department of Ecology - Stormwater Home Page
<http://www.ecy.wa.gov/programs/wq/stormwater/index.html>
Salmon and Watershed Information Management (SWIM) Team
<http://www.swim.wa.gov/>
Federal Departments:
Federal Emergency Management Agency (FEMA)
<http://fema.gov/>
U.S. EPA Office of Water, Academy 2000
<http://epa.gov/watertrain/>
U.S. Geological Survey (USGS) Departments:
USGS Historical Water Resource Data
<http://wa.water.usgs.gov/realtime/historical.html>
USGS National Water Information System (NWISWeb)
<http://water.usgs.gov/nwis/>
TerraServer (zoom in on USGS aerial photos anywhere in the USA)
<http://terraserver-usa.com/>
F-3
Water Quality and NPDES:
Natural Resources Conservation Service (NRCS) and U.S. Department of Agriculture (USDA)
<http://www.nrcs.usda.gov/>
National Climatic Data Center Data Archive
<http://www.ncdc.noaa.gov/>
National Weather Service Hydrologic Forecasts (River Flooding)
<http://ahps2.wrh.noaa.gov/ahps2/index.php?wfo=sew>
USGS Real Time Gauging Info
<http://wa.water.usgs.gov/realtime/current.html>
U.S. Army Corps of Engineers Real Time Gauge Info
<http://www.nwd-wc.usace.army.mil/nws/hh/basins/puy.html>
The Central Puget Sound Water Suppliers' Forum
<http://www.ci.seattle.wa.us/Forum>
Thurston County:
Thurston County Homepage
<http://www.co.Thurston.wa.us/>
Thurston County Stormwater Utility
< http://www.co.thurston.wa.us/stormwater/>
Thurston County Mapping
<http://www.geodata.org>
Thurston Conservation District
<http://www.Thurstoncountycd.org/>
Thurston County Public Health and Social Services
<http://www.co.thurston.wa.us/health/ehadm/index.html>
Other Agencies:
NWS River Forecast Center - Flood Outlook
<http://www.nwrfc.noaa.gov/river/fop.cgi>
NOAA Tide and Current Predictions
<http://co-ops.nos.noaa.gov/tp4days.html>