HomeMy WebLinkAboutLUA 09-061_Report 01CITY OF RENTON
DEPARTMENT OF COMMUNITY & ECONOMIC
DEVELOPMENT
MEMORANDUM
Date: August 27, 2009
To: City Clerk's Office
From: Stacy Tucker
Subject: Land Use File Closeout
Please complete the following information to facilitate project closeout and indexing by the City
Clerk's Office.
Project Name: 2009 City of Renton Surface Water Design Manual
LUA (file) Number: LUA-09-061, ECF
t Cross -References:
AKA's:
Project Manager: Gerald C. Wasser
Acceptance Date: June 5, 2009
Applicant: City of Renton
Owner: City of Renton
Contact: Allen Quynn -City of Renton
is PID Number:
N/A }
ERC Decision Date: June 22, 2009
ERC Appeal Date: July 10, 2009 k
Administrative Denial:
Appeal Period Ends:
u
Public Hearing Date:
Date Appealed to HEX:
By Whom:
HEX Decision: Date:
Date Appealed to Council:
By Whom: z
Council Decision: Date:
Mylar Recording Number:
Project Description: The applicant is requesting a non -project Environmental (SEPA) Review of a k
new City of Renton Surface Water Design Manual for new development, redevelopment and r
construction sites in the City of Renton that are equivalent to the minimum technical requirements,
thresholds and definitions in Appendix I of the Washington Department of Ecology's Phase II 4
National Pollution Discharge Elimination System (NPDES) Municipal Stromwater Permit for Western
Washinaton.
' Location: Citywide
Comments:
City of Renton :;�be partM.�nt of Community & Economic Development
ENVIRONMENTAL & DE'VfI PMENT APPLICATION REVIEW SHEET
REVIEWING DEPARTMENT:
APPLICATION NO: LUA09-06 EC
Probable
Minor
Impacts
COMMENTS DUE: JUNE 19, 2009
DATE CIRCULATED: JUNE 5, 2669
APPLICANT: Allen Qu nn - City of Renton
Each
PLANNER: JerryWasser
PROJECT TITLE: 2009 City of Renton S
Manual
ce Water Design
PLAN REVIEWER: Kayren Kittrick
SITE AREA: N/A 6
utilities
EXISTING BLDG AREA (gross): NIA
LOCATION: Citywide
SED BLDG AREA(gross) NIA
Plants
WORK ORD : 78068
PLEASE RETUPf TO JERRY WASSER IN CURRENT}PLANNING 6T" FLOOR
SUMMARY OF PROPOSAL: Tlke applicant is requesting a non -project Envi ental (SEPA) Review of a new City of Renton
Surface Water Design Manual for w development, redevelopment an ruction sites in the City of Renton that are equivalent to
the minimum technical requirements, holds and deft ppendix I of the Washington Department of Ecology's Phase II
National Pollution Discharge Elimination Sys em S) Municipal Strom
Permit for Western Washington. In order to meet
these standards, the City proposes to amend the Renton Municipal Code by adopting the 2009 King County Surface Water Design
Manual (KCSWDM) with City addendums containing specific requirements and procedures applicable to the City. Most changes to
the 2009 KCSWDM are minor; however, the Renton Surface Water Design Manual would apply different flow standards in certain
areas of the City that meet the minimum requirements in the permit provided they are approved by the Department of Ecology.
A_ ENVIRONMENTAL IMPACT (e.g. Non -Code) COMMENTS
Element of the
Environment
Probable
Minor
Impacts
Probable
Major
Impacts
More
Information
Necessary
Each
Light/Glare
Air
utilities
Water
Public Services
Plants
Airport Environment
10.000 Feet
14, 000 Feet
Land/Shoreline Use
Animals
Environmental Health
Energy/
Natural Resources
B. POLICY -RELATED COMMENTS
C. CODE -RELATED COMMENTS
Element of the
Environment
Probable Probable More
Minor Major information
Impacts Impacts Necessary
Housing
Aesthetics
Light/Glare
Recreation
utilities
Transportation
Public Services
Historic/Ci.ltural
Preservation
Airport Environment
10.000 Feet
14, 000 Feet
We have reviewed this application with particular attention to those areas in which we have expertise and have identified areas of probable impact or
areas where additional information is needed to properly assess this proposal.
Signature of Director or Authorized Representative
Date
DEPARTMENT OF COMMUNITY 100clity0f
AND ECONOMIC DEVELOPMENT Now
M E M O R A N D U M
DATE: June 13, 2009
TO: Allen Quynn, Utility Systems
FROM: Gerald C. Wasser, Planning Division
SUBJECT: 2009 City of Renton Surface Water Design Manual
LUA09-061, ECF
This is to inform you that the appeal period ended July 10, 2009 for the Environmental
Review Committee's (ERC) Determination of Non -Significance for the above -referenced
project.
No appeals were filed on the ERC determination therefore, this decision is final and
application for the appropriately required permits may proceed.
in addition, please see attached for the Addendum to the Environmental (SEPA)
Determination of Non -Significance. There is no comment/appeal period for this
Addendum, dated July 13, 2009 issued by the City of Renton Environmental Review
Committee.
If you have any questions, please feel free to contact me at 430-7382.
Attachment
Final No Appeals Memo 09-061.doc
DEPARTMENT OF COMMUNITY a City of
AND ECONOMIC DEVELOPMENT
ADDENDUM TO ENVIRONMENTAL DETERMINATION OF
NON -SIGNIFICANCE (DNS)
Pursuant to WAC 197-11.-600 (4) (c) and WAG 197-11-625
Addendum to 2009 City of Renton Surface Water Design Manual
as Addended by the City of Renton LUA-09-061 ECF
Determination of Non -Significance (DNS)
Date of Addendum:
Date of Original Issuance of SEPA
Threshold Determination:
Proponent:
Application File:
Project Name:
July 13, 2009
June 22, 2009
Allen Quynn, City of Renton Stormwater Utility
LUA-09-061, ECF
2009 City of Renton Surface Water Design Manual
Proposal / Purpose of Addendum: The City of Renton issued a Determination of Non -
Significance for the new City of Renton Surface Water Design Manual on June 22, 2009. The
project is being amended to incorporate regulations regarding illicit discharges and illicit
connection into the City's Municipal storm Sewer System in order to comply with the Phase II
National Permit Discharge Elimination System (NPDES) Permit. The City of Renton is hereby
issuing a SEPA Addendum pursuant to WAC 197-11-600.
This Addendum is appropriate because it contains only minor new information not included in
the original Determination and there are no environmental impacts related to inclusion of the
new information.
Location: Citywide
Lead Agency: City of Renton, Department of Community & Economic Development
Review Process: Addendum to previously issued Determination of Non -Significance (DNS)
Additional Information: If you would like additional information, please contact Gerald
Wasser, Associate Planner City of Renton, Planning Division, Department of Community &
Economic Development at (425) 430-7382.
There is no comment period for this Addendum, dated July 13, 2009 issued by the City of
Renton Environmental Review Committee.
ENVIRONMENTAL REVIEW COMMITTEE
SIGNATURES:
Gregg ZimmermVart
Ad nistrator DAT
Public Works Dement
Terry Higashiyama, Administrator DATE
Community Services Department
I. David Daniels, Administrator DATE
Fire & Emergency Services
Alex Pietsch, Adminis ator DTE
Department of Community & Economic Development
PUBLIC WORKS DEPARTMENT Chyoll�
r i r;J
M E M O R A N D U M
DATE: July 7, 2009
TO: Jennifer T. Henning, CED Current Planning Manager
FROM: Ron Straka, Surface Water Utility Engineering Supervisor (ext.
7248)
SUBJECT: Amendments to the City of Renton Revised Surface Water
Design Manual SEPA application
Utility Systems is submitting the attached SEPA checklist to amend the City of Renton revised
Surface Water Design Manual SEPA application to incorporate regulations regarding
illicit discharges and illicit connection into the City's municipal separate storm sewer
system in order to comply with the Phase II NPDES Permit.
Other attachments to this document are: Illicit Discharge Detection and Elimination
Draft Ordinance, the 2009 King County Stormwater Pollution Prevention Manual (SPPM)
and City Amendments to the SPPM.
If you have any questions, please contact me.
Attachments
h:liile s�, s'sisp - surface water projcctslswp-27 - sur€'act water projects (cip )1?7-3058 2003 npdes phase ii permity2000
idle"1300-sepalmemn - sepa amendment 200907 01.docARStp
PLANNING DIVISION
A - ki L_ YJ I ael Ll I L�i I : I -.Yr�eI.lV41 0 *6�
City of Renton Planning Division
1055 South Grady Way, Renton, WA 98057
Phone: 425-430-7200 Fax: 425-430-7231
PURPOSE OF CHECKLIST:
The State Environmental Policy Act (SEPA), Chapter 43.21 C RCW, requires all governmental agencies to
consider the environmental impacts of a proposal before making decisions. An Environmental Impact
Statement (EIS) must be prepared for all proposals with probable significant adverse impacts on the
quality of the environment. The purpose of this checklist is to provide information to help you and the
agency identify impacts from your proposal (and to reduce or avoid impacts from the proposal, if it can be
done) and to help the agency decide whether an EIS is required.
INSTRUCTIONS FOR APPLICANTS:
This environmental checklist asks you to describe some basic information about your proposal.
Governmental agencies use this checklist to determine whether the environmental impacts of your
proposal are significant, requiring preparation of an EIS. Answer the questions briefly, with the most
precise information known, or give the best description you can.
You must answer each question accurately and carefully, to the best of your knowledge. In most cases,
you should be able to answer the questions from your own observations or project plans without the need
to hire experts. If you really do not know the answer, or if a question does not apply to your proposal, write
"do not know" or "does not apply". Complete answers to the questions now may avoid unnecessary
delays later.
Some76 questions ask about governmental regulations, such as zoning, shoreline, and landmark
designations. Answer these questions if you can. If you have problems, the governmental agencies can
assist you.
The checklist questions apply to all parts of your proposal, even if you plan to do them over a period of
time or on different parcels of land. Attach any additional information that will help describe your proposal
or its environmental effects. The agency to which you submit this checklist may ask you to explain your
answers or provide additional information reasonably related to determining if there may be significant
adverse impact.
USE OF CHECKLIST FOR NONPROJECT PROPOSALS:
Complete this checklist for nonproject proposals, even though questions may be answered "does not
apply." IN ADDITION, complete the SUPPLEMENTAL SHEET FOR NONPROJECT ACTIONS (part D).
For nonproject actions (actions involving decisions on policies, plans and programs), the references in the
checklist to the words "project," "applicant," and "property or site" should be read as "proposal"
"proposer," and "affected geographic area," respectively.
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A. BACKGROUND
1 Name of proposed project, if applicable:
Adoption of the City of Renton Illicit Discharge Detection and Elimination ordinance;
amending Title IV related to section 4-6-430 Drainage (Surface Water standard)
2. Name of applicant:
City of Renton — Surface Water Utility
3. Address and phone number of applicant and contact person:
Ron Straka (425) 430 - 7248
4. Date checklist prepared:
May 18, 2009
5. Agency requesting checklist:
City of Renton
6. Proposed timing or schedule (including phasing, if applicable):
The element of this proposed action is expected to be adopted by City Council before
August 16, 2009.
7. Do you have any plans for future additions, expansion, or further activity related to or connected
with this proposal? If yes, explain.
There may be additional amendments to RMC 4-6-030 regarding illicit Discharge Detention
and Elimination provisions as required per future cycles of the Western Washington Phase
11 NPDES Permit. There is nothing specific planned or identified at this time.
List any environmental information you know about that has been prepared, or will be prepared,
directly related to this proposal.
None identified at this time
Do you know whether applications are pending for governmental approvals of other proposals
directly affecting the property covered by your proposal? If yes, explain.
Not applicable
10. List any governmental approvals or permits that will be needed for your proposal, if known
Approval by the Renton City Council is necessary to carry out this specific action.
11. Give brief, complete description of your proposal, including the proposed uses and the size of the
project and site.
This proposal is a nonproject action that will amend Title IV of the Renton City Code to
effectively prohibit non -storm water, illicit discharges, and / or dumping into the City of
Renton municipal separate storm sewer system to the maximum extent allowable as
required in the Western Washington Phase 11 NPDES Permit. See attached draft ordinance.
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12- Location of the proposal. Give sufficient information for a person to understand the precise
location of your proposed project, including a street address, if any, and section, township, and
range if known. If a proposal would occur over a range of area, provide the range or boundaries
of the site(s). Provide a legal description, site plan, vicinity map, and topographic map, I
reasonably available. While you should submit any plans required by the agency, you are not
required to duplicate reaps or detailed plans submitted with any permit applications related to this
checklist.
Code amendmentti'to Title IV will be offi�ctive within Citi rrf Renlan'.s%uri.stlictinnrrl
boundaries. See attachment A.
B. ENVIRONMENTAL ELEMENTS
EARTH
a. General description of the site (circle one); flat, rolling. hilly, steep slopes, mountainous.
other
Topography in the City of Renton varies from flat to mountainous.
What is the steepest slope on the site (approximate percent slope?)
Steep Slopes in excess of 40 percent are found throughout the City of Renton.
C. What general types of soils are found on the site (for example, clay, sand, gravel, peat,
muck)? If you know the classification of agricultural soils, specify them and note any
prime farmland.
The soil types in the City of Renton vary widely but are dominated by soils derived
from glacial till and glacial outwash.
Are there surface indications or history of unstable soils in the immediate vicinity? If so.
describe.
There are surface indicators and history of unstable soils in the City of Renton. In
general, these areas are generally indicated in the City of Renton 2008 Slide Hazard
Map.
e. Describe the purpose, type, and approximate quantities of any filling or grading proposed.
Indicate source of fill.
Not Applicable — non project action
f. Could erosion occur as a result of clearing, construction, or use? If so, generally
describe.
Not Applicable — non project action
g. About what percent of the site will be covered with impervious surfaces after project
construction (for example, asphalt or buildings)?
Not Applicable - this proposal will not result in the creation of any impervious
surface
Proposed measures to reduce or control erosion, or other impacts to the earth, if any
Not Applicable — non project action
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AIR
What types of emissions to the air would result from the proposal (i.e , dust, automobile,
odors, industrial wood smoke) during construction and when the project is completed? If
any, generally describe and give approximate quantities if known
Not Applicable — non project action
Are there any off-site sources of emission or odor that may affect your proposal? If so,
generally describe.
Not Applicable — non project action
C. Proposed measures to reduce or control emissions or other impacts to air, if any:
Not Applicable — non project action
WATER
a. Surface Water:
1 } Is there any surface water body on or in the immediate vicinity of the site (including year-
round and seasonal streams, saltwater, lakes, ponds, wetlands)? If yes, describe type
and provide names. If appropriate, state what stream or river it flows into.
There are numerous surface water bodies located in the City of Renton, including
rivers, streams, ponds as identified in the City of Renton Stream and Lake Map.
2) Will the project require any work over, in, or adjacent to (within 200 feet) the described
waters? If yes, please describe and attach available plans.
Not Applicable — non project action
3) Estimate the amount of fill and dredge material that would be placed in or removed from
surface water or wetlands and indicate the area of the site that would be affected.
Indicate the source of fill material.
Not Applicable — non project action
4) Will the proposal require surface water withdrawals or diversions? Give general
description, purpose, and approximate quantities if known
Not Applicable — non project action
5) Does the proposal lie within a 100 -year flood plain? if so. note location on the site plan.
Not Applicable — non project action
6) Does the proposal involve any discharges of waste materials to surface waters? {f so,
describe the type of waste and anticipated volume of discharge.
Not Applicable — non project action
The purpose of this specific action is to protect water quality reducing the
discharge of pollutants into the storm system.
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b. Ground Water:
1) Will ground water be withdrawn, or will water be discharged to ground water? Give
general description, purpose, and approximate quantities if known.
Not Applicable — non project action
2) Describe waste material that will be discharged into the ground from septic tanks or other
sources, if any (for example: Domestic sewage; industrial, containing the following
chemicals...; agricultural; etc.). Describe the general size of the system, the number of
such systems, the number of houses to be served (if applicable), or the number of
animals or humans the system(s) are expected to serve,
Not Applicable — non project action
The purpose of this specific action is to protect water quality reducing the
discharge of pollutants into the storm system.
C. Water Runoff (including storm water):
1) Describe the source of runoff (including storm water) and method of collection and
disposal, if any (include quantities, if known). Where will this water flow? Will this water
flow into other waters, If so, describe
Not Applicable — non project action
2) Could waste material enter ground or surface waters? If so, generally describe.
Not Applicable — non project action
The purpose of this specific action is to protect water quality reducing the
discharge of pollutants into the storm system.
d. Proposed measures to reduce or control surface, ground.. and runoff water impacts, if
any:
Not Applicable — non project action
The purpose of this specific action is to protect water quality reducing the
discharge of pollutants into the storm system.
4. PLANTS
a. Check or circle types of vegetation found on the site: Not Applicable — non project
action.
A variety of plants can be found in the City. The provisions of this proposed
ordinance do not relate to proximity to any plant.
deciduous tree: alder.. maple. aspen, other
evergreen tree: fir, cedar, pine, other
shrubs
grass
pasture
crop or grain
wet soil plan ts: cattail, buttercup, bullrush, skunk cabbage, other
water plants: water lily, eel grass, milfoil, other
other types of vegetation
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What kind and amount of vegetation will be removed or altered?
Not Applicable -- non project action
C. List threatened or endangered species known to be on or near the site
Not Applicable - non project action
Proposed landscaping, use of native plants, or other measures to preserve or enhance
vegetation on the site, if any:
Not Applicable - non project action
5. ANIMALS: Not Applicable - non project action
The provisions of this proposed ordinance do not relate to proximity of any
regulated facility to any animal habitat.
a. Circle any birds and animals, which have been observed on or near the site or are known
to be on or near the site:
Not Applicable - non project action
Birds: hawk, heron, eagle, songbirds, other
Mammals: deer, bear, elk, beaver, other
Fish: bass, salmon, trout, herring, shellfish, other
List any threatened or endangered species known to be on or near the site.
Not Applicable - non project action
C. Is the site part of a migration route? If so, explain
Not Applicable - non project action
Proposed measures to preserve or enhance wildlife, if any
Not Applicable - non project action
6. ENERGY AND NATURAL RESOURCES: Not Applicable - non project action
What kinds of energy (electric, natural gas, oil, wood stove, solar) will be used to meet the
completed project's energy needs? Describe whether it will be used for heating,
manufacturing, etc.
Not Applicable - non project action
Would your project affect the potential use of solar energy by adjacent properties? If so,
generally describe.
Not Applicable - non project action
C. What kinds of energy conservation features are included in the plans of this proposal?
List other proposed measures to reduce or control energy impacts, if any
Not Applicable - non project action
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7. ENVIRONMENTAL HEALTH: Not Applicable -- non project action
Are there any environmental health hazards, including exposure to toxic chemicals. risk
of fire and explosion, spill, or hazardous waste that could occur as a result of this
proposal? If so, describe.
Not Applicable — non project action
1) Describe special emergency services that might be required.
Not Applicable — non project action
2) Proposed measures to reduce or control environmental health hazards, if any
Not Applicable — non project action
b. Noise: Not Applicable —non project action
1) What types of noise exist in the area which may affect your project (for example: traffic,
equipment, operation, other)?
Not Applicable — non project action
2) What types and levels of noise would be created by or associated with the project on a
short-term or a long-term basis (for example: traffic, construction, operation. other)?
Indicate what hours noise would come from the site.
Not Applicable — non project action
3) Proposed measures to reduce or control noise impacts, if any:
Not Applicable — non project action
8. LAND AND SHORELINE USE
a. What is the current use of the site and adjacent properties?
The City of Renton has many different land uses including industrial, commercial,
residential and resource conservation.
b. Has the site been used for agriculture? If so, describe.
Not Applicable — non project action
G. Describe any structures on the site.
Not Applicable— non project action
Most of the structures in the City of Renton are single-family residential homes,
commercial buildings and factories.
d. Will any structures be demolished? If so,what?
Not Applicable — non project action
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e. What is the current zoning classification of the site?
There are various zoning classifications in the City of Renton including multiple
types of residential, commercial and industrial and mixed use.
f. What is the current comprehensive plan designation of the site?
This proposal covers the entire City including future annexations. The City
contains properties and locations with residential, center, employment area, and
miscellaneous land use designation.
g. If applicable, what is the current shoreline master program designation of the site?
This proposal covers the entire City, all current shorline master program
designations apply. These designations are urban, conservation and natural.
h. Has any part of the site been classified as an "environmentally sensitive" area? If so,
specify.
Many areas in the City of Renton are considered environmentally sensitive and are
identified in the City's various sensitive area maps.
i Approximately how many people would reside or work in the completed project?
Not Applicable — non project action
j. Approximately how many people would the completed project displace?
Not Applicable — non project action
k. Proposed measures to avoid or reduce displacement impacts, if any:
Not Applicable — non project action
I. Proposed measures to ensure the proposal is compatible with existing and projected land
uses and plans, if any.
Not Applicable — non project action
9. HOUSING: Not Applicable — non project action
a. Approximately how many units would be provided, if any? Indicate whether high, middle,
or low-income housing.
Not Applicable — non project action
b. Approximately how many units, if any, would be eliminated? Indicate whether high,
middle, or low-income housing.
Not Applicable — non project action
C. Proposed measures to reduce or control housing impacts, if any:
Not Applicable —iron project action
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10. AESTHETICS: Not Applicable — non project action
What is the tallest height of any proposed structure(s), not including antennas; what is the
principal exterior building material(s) proposed.
Not Applicable — non project action
What views in the immediate vicinity would be altered or obstructed?
Not Applicable — non project action
C. Proposed measures to reduce or control aesthetic impacts, if any:
Not Applicable — non project action
11- LIGHT AND GLARE: Not Applicable -- non project action
a. What type of light or glare will the proposal produce? What time of day would it mainly
occur?
Not Applicable — non project action
b. Could light or glare from the finished project be a safety hazard or interfere with views?
Not Applicable — non project action
C. What existing off-site sources of light or glare may affect your proposal?
Not Applicable — non project action
d. Proposed measures to reduce or control light and glare impacts, if any:
Not Applicable — non project action
12. RECREATION: Not Applicable — non project action
a_ What designated and informal recreational opportunities are in the immediate vicinity?
Not Applicable — non project action
Would the proposed project displace any existing recreational uses? If so, describe.
Not Applicable — non project action
C. Proposed measures to reduce or control impacts on recreation, including recreation
opportunities to be provided by the project or applicant, if any:
Not Applicable — non project action
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13. HISTORIC AND CULTURAL PRESERVATION: Not Applicable - non project action
a. Are there any places or objects listed on, or proposed for. national state, or local
preservation registers known to be on or next to the site? If so, generally describe.
Not Applicable - non project action
b. Generally describe any landmarks or evidence of historic, archaeological, scientific, or
cultural importance known to be on or next to the site.
Not Applicable - non project action
C. Proposed measures to reduce or control impacts, if any:
Not Applicable - non project action
14. TRANSPORTATION: Not Applicable - non project action
a. Identify public streets and highways serving the site, and describe proposed access to the
existing street system. Show on site plans, if any.
Not Applicable - non project action
b. Is site currently served by public transit? If not, what is the approximate distance to the
nearest transit stop?
Not Applicable - non project action
C. How many parking spaces would the completed project have? How many would the
project eliminate?
Not Applicable - non project action
d. Will the proposal require any new roads or streets, or improvements to existing roads or
streets, not including driveways? If so, generally describe (indicate whether public or
private?
Not Applicable - non project action
e. Will the project use (or occur in the immediate vicinity of) water, rail, or air transportation?
If so, generally describe.
Not Applicable - non project action
f. How many vehicular trips per day would be generated by the completed project? If
known, indicate when peak volumes would occur.
Not Applicable - non project action
g. Proposed measures to reduce or control transportation impacts, if any:
Not Applicable - non project action
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15. PUBLIC SERVICES: Not Applicable — non project action
Would the project result in an increased need for public services (for example: fire
protection, police protection, health care, schools, other)? If so, generally describe.
Not Applicable — non project action
Proposed measures to reduce or control direct impacts on public services, if any.
Not Applicable — non project action
16. UTILITIES: Not Applicable — non project action
a. Circle utilities currently available at the site: electricity, natural gas, water, refuse service,
telephone, sanitary sewer, septic system, other.
Not Applicable — non project action
Describe the utilities that are proposed for the project, the utility providing the service, and
the general construction activities on the site or in the immediate vicinity which might be
needed.
Not Applicable — non project action
C. SIGNATURE
I, the undersigned, state that to the best of my knowledge the above information is true and
complete. It is understood that the lead agency may withdraw any declaration of non -significance
that it might issue in reliance upon this checklist should there be any willful misrepresentation or
willful lack of full disclosure on my part.
Proponent:
Name Printed:7 tr�•t
Date: 7 /,o
H (File 5ys1SWP - Surface Water Projects%SWP-27 - Surface Wafer Projects {CJP1127-3058 2003 NPDES Phase H Perm4l,2000
IDDE11300-5EPA12009-05-13 1DDE Sepa checkllst.doc - 11 - 02/08
D. SUPPLEMENTAL SHEETS FOR NONPROJECT ACTIONS
(These sheets should only be used for actions involving decisions on policies, plans and
programs. You do not need to fill out these sheets for project actions.)
Because these questions are very general, it may be helpful to read them in conjunction with the
list of the elements of the environment.
When answering these questions, be aware of the extent the proposal, or the types of activities
likely to result from the proposal, would affect the item at a greater intensity or at a faster rate than
if the proposal were not implemented. Respond briefly and in general terms.
How would the proposal be likely to increase discharge to water; emissions to air; production,
storage, or release of toxic or hazardous substances; or production of noise?
The proposed ordinance will not result in any of the above conditions
Proposed measures to avoid or reduce such increases are: No measures are proposed
How would the proposal be likely to affect plants, animals, fish, or marine life?
The proposed ordinance will not result in any of the above conditions
Proposed measures to protect or conserve plants, animals, fish, or marine life are No
measures are proposed
How would the proposal be likely to deplete energy or natural resources?
The proposed ordinance will not result in any of the above conditions
Proposed measures to protect or conserve energy and natural resources are: No measures
are proposed
4. How would the proposal be likely to use or affect environmentally sensitive areas or areas
designated (or eligible or under study) for governmental protection; such as parks. wilderness,
wild and scenic rivers, threatened or endangered species habitat, historic or cultural sites,
wetlands, flood plains, or prime farmlands?
The proposed ordinance improves protection of sensitive or protected areas that are
potentially affected by releases of illicit discharges and / or spills, reducing the potential
for such substances to come in contact with the environment.
Proposed measures to protect such resources or to avoid or reduce impacts are: Measures
to protect such resources and / or reduce impact include but are not limited to public
education and outreach to citizens of Renton and business owners of hazards
associated with illegal discharges and improper disposal of materials.
H:Tile Sys\SWP - Surface Water ProjectslSVVP-27 - Surface Water Projects (CIP)127-3058 2003 NPDES Phase II Permit12000
IDDE11300-SEPA12009-05-13 IDDE Sepa checklist.doc - 12- 02108
5 How would the proposal be likely to affect land and shoreline use, including whether it would allow
or encourage land or shoreline uses incompatible with existing plans?
The proposed ordinance does not affect the likelihood of selection of a shoreline landform.
Proposed measures to avoid or reduce shoreline and land use impacts are: No measures
are proposed
5. How would the proposal be likely to increase demands on transportation or public services and
utilities?
The proposed ordinance will not result in any of the above conditions
Proposed measures to reduce or respond to such demand(s) are: No measures are
proposed
7. Identify, if possible, whether the proposal may conflict with local, state, or federal laws or
requirements for the protection of the environment.
Not applicable
SIGNATURE
I, the undersigned, state that to the best of my knowledge the above information is true and
complete. It is understood that the lead agency may withdraw any declaration of non -significance
that it might issue in reliance upon this checklist should there be any willful misrepresentation or
willful lack of full disclosure on my part.
Proponent: L 441
F
Name Printed: 'Rd Id X.
Date: 7 G /o
ENVCHLSTDOC
REVISFD 6198
H \File Sys1SWP - Surface Water Projects\SWP-27 - Surface Water Projects (CIP)127-3058 2003 NPDES Phase II PerrnA12000
IDDE11300-SEPA12009-05-13 IDDE Sepa checklist.doc - 13- 02108
Attachment A
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RCrItOrl Municipal Code
CITY OF RENTON, WASHINGTON [DRAFT #3]
ORDINANCE NO.
AN ORDINANCE OF THE CITY OF RENTON, WASHINGTON, AMENDING RMC 4-6-030 TO
PROVIDE FOR PUBLIC EDUCATION AND REGULATION OF ILLICIT STORMWATER
DISCHARGE, ITS DETECTION AND ELIMINATION, ADOPTION OF THE STORMWATER
POLLUTION PREVENTION MANUAL, ADDING DEFINITIONS, AMENDING THE STATEMENT
OF LEGISLATIVE PURPOSE, PROVIDING THAT VIOLATIONS THEREOF SHALL BE AN
INFRACTION AND REPEAT VIOLATIONS A MISDEMEANOR, DECLARING ILLICIT
CONNECTIONS AND ILLICIT DISCHARGES A NUISANCE, AMENDING THE NUISANCES CODE
TO PROVIDE A REMEDY FOR ILLICIT DISCHARGE OF STORMWATER AND FOR ABATEMENT
THEREOF, AND PROVIDING A RIGHT OF APPEAL FROM ADMINISTRATIVE DECISIONS.
THE CITY COUNCIL OF THE CITY OF RENTON, WASHINGTON, DO ORDAIN AS FOLLOWS:
SECTION I. RMC 4-6-030 entitled "Drainage (Surface Water) Standards" is hereby
amended as follows:
A. PURPOSE:
1. to promote and develop policies with respect to the
City's watercourses and to preserve them by minimizing water quality degradation by
previous siltation, sedimentation and pollution of creeks, streams, rivers, lakes and other
bodies of water, and to protect property owners tributary to developed and undeveloped
land from increased runoff rates and to insure the safety of roads and rights-of-way. (Ord.
3174, 11-21-1977)
2. i to regulate the Municipal Separate Storm
ewer lystem (MS4) regarding the contribution of pollutants, consisting of any material other
than stormwaterYnyy
illicit discharges, illicit connections and/or
dumping into ail torm drain system, inclu ng surface and/or ground water throughout
the City that would adversely impact surface and ground water quality of
State of Washington in order to comply with requirements of the jkves National Pollutants
Discharge Elimination System (NPDES)
B. ADMINISTERING AND ENFORCING AUTHORITY:
The Administrator of the Public Works Department is
is responsible for the general administration and coordination of this Section. All provisions
of this Section shall be enforced by the Administrator and/or his or her designated
representatives. For such purpeses the A., ministrat„r OF his duly authawizoa representative
44. -,II h;..... th., ..QWeF Of a .,lic., off icer
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C. SUBMISSION OF DRAINAGE PLANS:
1. When Required: All persons applying for any of the following permits and/or approvals
shall submit for approval, unless expressly exempted under subsection C2 of this Section, a
drainage plan with their application and/or request:
a. Mining, excavation and grading permit;
b. Shoreline management substantial development permit;
c. Flood control zone permit;
d. Major plat;
e. Short plat approval, except where each lot contains thirty five thousand (35,000)
square feet or more;
f. Special permits;
g. Temporary permits;
h. Building permits. Where the permit relates to a single family residential structure of
less than five thousand (5,000) square feet, the Administrator may waive the plan
requirement except where the subject property is in a critical area, as determined under
subsection D of this Section;
L Planned urban development;
j. Site plan approvals;
k. Any other development or permit application which will affect the drainage in any
way.
The plan submitted during one permit approval process may be subsequently submitted
with further required applications. The plan shall be supplemented with additional
information at the request of the n.,.,,a a... ent- of Public 1AJ946.
(Ord. 5153, 9-26-2005)
2. When Plans Not Required: The plan requirement established in subsection C1 of this
Section shall not apply when the Department determines that the proposed
permit and/or activity:
a. Will not seriously and adversely impact the water quality conditions of any affected
receiving bodies of water; and/or
b. Will not substantially alter the drainage pattern, increase the peak discharge and
cause any other adverse effects in the drainage area.
c. Additionally, the plan requirement established in subsection C1 of this Section shall
not apply to single family residences when such structures are less than five thousand (5,000)
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Renton Municipal Code
square feet, unless the subject property is in a critical area as determined under subsection D
of this Section.
D. DEVELOPMENT RESTRICTIONS IN CRITICAL FLOOD, DRAINAGE AMD/OR EROSION
AREAS:
Development which would increase the peak flow and/or the volume of discharge from
the existing flooding, drainage and/or erosion conditions presents an imminent likelihood of
harm to the welfare and safety of the surrounding community until such a time as the
community hazard is alleviated. Where applications of the provisions of this Section will deny
all reasonable uses of the property, the restriction on development contained in this Section
may be waived for the subject property; provided, that the resulting
development shall be subject to all of the remaining terms and conditions of this Section.
(Ord. 3174, 11-21-1977)
E. DRAINAGE PLAN REQUIREMENTS AND METHODS OF ANALYSIS:
1. Content: All persons applying for any of the permits and/or approvals contained in
subsection C1 of this Section shall provide a drainage plan for surface water flows entering,
flowing within and leaving the subject property. The drainage plan and supportive calculation
report(s) shall be stamped by a professional civil engineer registered in the State
of Washington. The drainage plan shall be prepared in conformance with the Core and Special
Requirements contained in sections 1.2 and 1.3 of chapter 1, the hydrologic analysis methods
contained in chapter 3, the hydraulic analysis and design criteria in chapter 4, and the
erosion/sedimentation control plan and practices contained in chapter 5 of the 1990 King
County Surface Water Design Manual, except where amended or appended by the
Department. (Ord. 4367, 9-14-1992; Amd. Ord. 4851, 8-7-2000)
2. Special Requirement #13; E Aquifer Recharge and Protection Areas: at Threshold
RegUirar,If a proposed project lies within an Aquifer Recharge and/or Protection Area as
defined and designed by City ordinance and as indicated on the Aquifer Recharge
and Protection Map at the City Permit Counter, = the proposed project drainage review
and engineering plans shall be prepared in accordance with the special requirements,
methods of analysis and design standards that have been adopted for aquifer recharge and
protection areas by City ordinance.
3. Additional Requirements in Aquifer Protection Areas - Amendments to King County
Surface Water Design Manual, Chapter 1: The following sections of chapter 1 of the 1990 King
County Surface Water Design Manual (which has been incorporated in the Renton Municipal
Code by reference) is hereby amended to read as follows by adding additional requirements
following the end of each section: (Amd. Ord. 4851, 8-7-2000)
a. Section 1.2.1, CORE REQUIREMENT #1: DISCHARGE AT THE NATURAL LOCATION:
i. Requirements that Apply within Zones 1 and 2 of an Aquifer Protection Area:
Surface water and stormwater runoff from a proposed project that proposes to construct
new, or modify existing drainage facilities must be discharged at the natural location so as
Printed on 07/06/2009 Page 3
Renton Municipal Code
not to be diverted onto, or away from, the adjacent downstream property, except that
surface and storm runoff from new or existing impervious surfaces subject to vehicular use or
storage of chemicals should be discharged at the location and in the manner which will
provide the most protection to the aquifer, as directed and approved by the Stormwater
Utility and the Water Utility.
ii. Discharge from the project must produce no significant adverse impact to the
downhill property. Where no conveyance system exists at the adjacent downstream property
line or other acceptable location and the discharge was previously unconcentrated flow, the
runoff must:
Be conveyed across the downstream properties to an acceptable discharge point
(see CORE REQUIREMENT #2; OFF-SITE ANALYSIS in § 1.2.2), with drainage
easement secured from the downstream owners and recorded at the King
County Office of Records and Elections prior to drainage plan approval, OR
Be discharged onto a rock pad shaped in a manner so as to disperse flow (see
Figure 4.3.51) if the runoff is less than 0.2 cfs runoff rate for the one hundred
(100) year, twenty four (24) hour duration design storm event existing site
conditions.
b. Section 1.2.3, CORE REQUIREMENT #3; RUNOFF CONTROL, "Biofiltration":
i. Requirements for Zone 1 of an Aquifer Protection Area: Proposed project
runoff resulting from more than five thousand (5,000) square feet of impervious surface, and
subject to vehicular use or storage of chemicals, shall not be treated prior to discharge from
the project site by on-site biofiltration measures but shall instead be treated by a wetvault
meeting the design criteria contained in § 1.3.5 SPECIAL REQUIREMENT #5; SPECIAL WATER
QUALITY CONTROLS. New or existing retrofitted wetvaults and appurtenances shall meet the
pipeline requirements specified in RMC 4-3-050H6a, Pipeline Requirements - Zone 1. (Amd.
Ord. 4851, 8-7-2000)
ii. Requirements for Zone 2 of an Aquifer Protection Area: Proposed project
runoff resulting from more than five thousand (5,000) square feet of impervious surface, and
subject to vehicular use or storage of chemicals, shall be treated prior to discharge from the
project site by on-site biofiltration measures as described in § 4.6.3 in Chapter 4 of the King
County Surface Water Design Manual. Biofiltration facilities may require a liner per the design
criteria described in the section "Liner to Prevent Groundwater Contamination" in the
introduction to § 4.6, Water Quality Facility Design.
iii. The biofiltration design flow rate shall be based on the peak rate of runoff for
the two (2) year, twenty four (24) hour duration design storm event total precipitation. Note,
biofiltration facilities installed following peak rate runoff control facilities may be sized to
treat the allowable release rate (predeveloped) for the two (2) year, twenty four (24) hour
duration design storm event for the peak rate runoff control facility. Biofiltration facilities
installed prior to peak rate runoff control facilities shall be sized based on the developed
conditions. (Amd. Ord. 4740, 7-19-1999)
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Renton Municipal Code
c. Section 1.2.3, CORE REQUIREMENT #3; RUNOFF CONTROL, "Detention Facilities":
i. Requirements for Zone 1 of an Aquifer Protection Area: The City of Renton
prohibits the construction of new detention ponds to control the peak rate of runoff from
new or existing impervious surfaces subject to vehicular use or storage of chemicals.
d. Section 1.2.3, CORE REQUIREMENT #3; RUNOFF CONTROL, "Retention Facilities":
i. Requirements for Zone 1 of an Aquifer Protection Area: The City of Renton
prohibits the construction of new retention ponds to control the peak rate of runoff from
new or existing impervious surfaces subject to vehicular use or storage of chemicals. (Amd.
Ord. 4740, 7-19-1999; Ord. 4851, 8-7-2000)
e. Section 1.2.3, CORE REQUIREMENT #3; RUNOFF CONTROL, "Infiltration Facilities":
i. Requirement for Zone 1 of an Aquifer Protection Area: The City of Renton
prohibits the construction of new infiltration facilities to control the peak rate of runoff from
new or existing impervious surfaces subject to vehicular use or storage of chemicals.
f. Section 1.2.4, CORE REQUIREMENT #4; CONVEYANCE SYSTEM "(4) For new drainage
ditches or channels":
i. Requirements for Zone 1 of an Aquifer Protection Area: New drainage ditches
or channels shall not be employed to convey the runoff resulting from impervious surface
that is subject to vehicular use or storage of chemicals.
ii. Requirements for Zone 2 of an Aquifer Protection Area: New drainage ditches
or channels may be employed in lieu of a pipe system. A groundwater protection finer may be
required for new drainage ditches or channels per the design criteria, and existing drainage
ditches or channels reconstructed, to convey the peak runoff from the twenty five (25) year
design storm using the design criteria described in the section "Liner to Prevent Groundwater
Contamination" in the introduction to § 4.6, Water Quality Facility Design, and the methods
of analysis described in § 4.3.7 in Chapter 4 of the King County Surface Water Design Manual
with a freeboard to overflow of 0.5 feet. In addition, new drainage ditches or channels must
be demonstrated to convey the peak runoff from the one hundred (100) year design storm
without overtopping. (Amd. Ord. 4740,7-19-1999)
g. Section 1.2.4, CORE REQUIREMENT #4; CONVEYANCE SYSTEM, "Composition":
L Requirements for Zone 1 of an Aquifer Protection Area: New conveyance
systems shall be constructed in accordance with the pipeline requirements specified in RMC
4-3-0501-16a, Pipeline Requirements - Zone 1, of the aquifer protection regulations. Proposed
projects shall provide an impervious surface for all new or existing areas that will be subject
to vehicular use or storage of chemicals. Said impervious surface shall be provided with the
proper catch basins and a pipeline storm drainage system in order to collect surface water
runoff and direct it into the downstream drainage conveyance system.
ii. Requirements for Zone 2 of an Aquifer Protection Area: A groundwater
Printed on 07/06/2009 Page 5
Renton Municipal Code
protection liner may be required for new drainage ditches or channels per the design criteria
described in the section "Liner to Prevent Groundwater Contamination" in the introduction to
§ 4.6, Water Quality Facility Design. Exception: New drainage ditches or channels do not
require a groundwater protection liner following the last water quality facility. Proposed
projects shall provide an impervious surface for all new or existing areas that will be subject
to vehicular use or storage of chemicals. Said impervious surface shall be provided with the
proper catch basins and an approved conveyance system in order to collect surface water
runoff and direct it into the downstream drainage conveyance system. (Amd. Ord. 4740, 7-19-
1999; Ord. 4851, 8-7-2000)
h. Section 1.3.5, SPECIAL REQUIREMENT #5; SPECIAL WATER QUALITY CONTROLS:
i. Requirements for Zone 1 of an Aquifer Protection Area:
Threshold: If a proposed project will discharge runoff from more than one acre of
impervious surface that will be subject to vehicular use or storage of chemicals,
and:
(1) Proposes direct discharge of runoff to a regional facility, receiving water,
lake, wetland, or closed depression without on-site peak rate runoff control; or
(2) The runoff from the project will discharge into a Type 1 or 2 stream, or Type
1 wetland, within one mile from the project site.
Requirement: The wetvault size shall be increased by a factor of 1.5 times the size
of the wetvault normally required per § 4.6.2 of the 1990 King County Surface
Water Design Manual and shall satisfy the wetvault required by § 1.2.3. CORE
REQUIREMENT #3: RUNOFF CONTROL in Zone 1 of the aquifer protection area.
New or existing retrofitted wetvaults and appurtenances shall meet the
pipeline requirements specified in RMC 4-3-050H6a, Pipeline Requirements -
Zone 1. (Amd. Ord. 4851,8-7-2000)
ii. Requirements for Zone 2 of an Aquifer Protection Area:
Threshold: If a proposed project will construct more than one acre of impervious
surface that will be subject to vehicular use or storage of chemicals, and
(1) Proposes direct discharge of runoff to a regional facility, receiving water,
lake, wetland, or closed depression without on-site peak rate runoff control; or
(2) The runoff from the project will discharge into a Type 1 or 2 stream, or Type
1 wetland, within one mile from the project site.
Requirement: Then a wetpond meeting the standards described above shall be
employed to treat a project's runoff prior to discharge from the site. A
wetvault or water quality swale, as described above, may be used when a
wetpond is not feasible. A groundwater protection liner may be required for
wetponds and water quality swales per the design criteria described in the
section "Liner to Prevent Groundwater Contamination" in the introduction to §
4.6, Water Quality Facility Design. (Ord. 4367,9-14-1992; amd. Ord. 4740, 7 -19 -
Printed on 0710612009 Page 6
Renton Municipal Code
1999)
F. ADOPTION OF STORRPOLLUTION PREVENTION MANUAL (SPPM)
The 2009 icing County Stormwater Pollution&Mntion manual (SPPM), as now or as
hereafter may be amended, and hereby referrAW'the Stormwater Pollution Prevention
Manual, is hereby adopted by reference. One copy of the manual shall be filed with the City
Clerk including any amendments thereto.
G. DISCHARGE PROHIBITION
1. Prohibition of Illicit Discharge: Materials&whether or not solids or liquids, other than
surface water and storm water shall not be spilled, leaked, emitted, discharged, disposed or
allowed to escape into the storm sewer a'W drain system, surface water, ground water, or
watercourses.
a. Examples of illicit discharge includelbut are not limited to the following:
L Trash, debris or garbage;
ii. Construction materials or waste water;
iii. Petroleum products, including but not limited to oil, gasoline, greases, fuel oil or
heating oil-
"M
AntifreezeM and other automotive products;
v. Metals in either particulate or dissoly orm
vi. Flammable or explosive materials ;
vii. Radioactive materials
viii. Acids or batteries
ix. Alkalis or basis;
x. Paints, stains, resins, lacquers, or va nishe
xi. Degreasels! solvents
xii. Drain cleaners
xiii. Pesticides, herbicides and fertilizers;
xiv. Steam cleaning wastes;
xv. Soaps, detergents, ammonias;
xvi. Swimming pool and spa cleaning wastewater and filter backwash containing water
disinfectants (chlorine, bromine, or other chemicals);
xvii. Heated water;
xviii. Domestic animal waste;
xix. Sewage,
xx. Recreational vehicle waste water or sewage;
xxi. Animal carcasses
xxii. Food waste;
xxiii. Bark and other fibrous material,
xxiv. Collected lawn clippings, leaves, branches or other yard waste material;
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Renton Municipal Code
xxv. Silt, sediment or gravel;
xxvi. Dyes J'am *^s}14^,
xxvii. Chemicals not normally found in uncontaminated water;
xxviii. Waste water or process water (including filtered or purified);
xxix. a Stormwater Pollution Prevention
Manual; and
xxx. Any hazardous material as defined in RMC 4-11-080, or waste not listed above and
any other process -associated discharge except as otherwise allowed in this
jection.
b. amples of allowed,ischarges by this If
the discharges do not contain pollutants and unless the dministrator
evaluates and determinesd that they are causing an adverse impact:
L Diverted stream flows;
ii. Spring water
iii. Rising ground water;
iv. Uncontaminated ground water infiltration;
v. Uncontaminated pumped ground water;
vi. Foundation or footing drains;
vii. Water from crawl space pumps;
viii. Air conditioning condensation;
ix. Flows from riparian habitat and wetland;
x. Discharges from emergency fire fighting activities
xi. Discharges specified in writing by the authorized enforcement agency as being
necessary to protect public health and safety;
xii. Irrigation water from a agricultural source that is commingled with stormwater
runoff;
xiii. Storm system dye testing is allowable by the City, and any dye testing by others
requires verbal notification to the Public Works Department at least one day
prior to the date of the test.
e: Activities that w4ght may, result in illicit discharge, unless the application of Best
Management Practices cified in the Storm Water Pollution
Prevention Manual 4MhWized, ' -iced-i�►
tf}e`Ster,rRrevention Manual that and .eqUqFe-_thO
to
L Discharges from potable water sources, including water line flushing,
hyperchlorinated water line flushing, fire hydrant system flushing, and pipeline
hydrostatic test water. Planned discharges shall be dechlorinated to a
concentration of 0.1 ppm or less, pH -adjusted, if necessary, and volumetrically
and velocity controlled to prevent re -suspension of sediments into the MS4;
ii. Discharges from lawn watering and other irrigation runoff. These shall be
minimized through, at a minimum, public education activities and water
conservation efforts;
iii. Dust control with potable water;
Printed on 07106/2009 Paye 8
Renton Municipal Code
iv. Automotive, airplane and boat washing;
V. Pavement and building washing;
vi. Dechlorinated swimming pool discharges. The discharges shall be dechlorinated
to a concentration of 0.1 ppm or less, pH -adjusted and reoxygenized if necessary,
volumetrically and velocity controlled to prevent re -suspension of sediments in
the MS4
Vii. Street sidewalk wash water, --water ured—to control`-d-st
viii. Auto repair and maintenance;
ix. Building repair and maintenance;
X. Landscape maintenance;
xi. Hazardous waste handling;
xii. Solid and food waste handling;
xiii. Application of pesticides,
xiv. Non-stormwater discharge permitted under another NPDES permit, provided
that the discharge is in full compliance with all requirements of the permit,
waiver, or ether. and other applicable requirements and regulations.
d. A person does not violate subsection it ® if:
i. That person has properly designed, constructed, implemented and is maintaining
BMPs as required by this Chapter but contaminants continue to
enter surface and storm water and underground water,
ii. That person can demonstrate that there are no additional contaminants in
discharges from the site above the background conditions of water entering the
site;
iii. The discharge is a result #gem Man emergency response activity or other action
that must be undertaken immediately or within a time to too short to allow full
compliance with this Chapter or Section in order to avoid an imminent threat to
public health or safety. The a &dministrator by public rule may specify actions
that qualify for this exemption in City procedures. A person undertaking
emergency response activities shall take steps to assure that the discharges
resulting from such activities are minimized. In addition, this person shall
evaluate BMPs to restrict recurrence.
e. person a who knowingly allows or
is "able for any prohibited discharges, as[ctio
1, through illicit connections,
dumping, spills, improper maintenance of BMPs or other discharges, that
allow contaminants to enter surface and storm water or ground water; go
b ' �l
bion.
2. Prohibition of Illicit Connections: The construction, use, maintenance or continued
existence of any connection identified by thea Idministrator or 'F!'-
that
is"that ea, -lei M convey any pollution -ar con a. anything not composed
entirely of surface water and storm water, directly into MURiGipal Drainage
aeil+ties®is prohibited, including without limit tion7jila illicit connections
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Renton N9unicipal Code
Made in the past regardless of whether the connection was permissible under law of
or practices applicable or prevailing at the time of connection.
3. Remedy:
a. The person and/or property owner responsible for an illicit or
illicit discharge and OF the e . er of the prepeFty on which thea illiriF dirch;1 n
h,r. ar-r-,�rroa shall initiate and complete all actions necessary to remedy the
effects of such connection or felease discharge at no cost to the City.
b. If the person responsible for an illicit 1&nection or H14 discharge and/or the
owner of the property onwhich the illicit onnection or W, discharge has
occurred fails to address the illicit it discharge in a timely
manner, the Department for or 4& his or her designee awtbari;ed
agents shall have the authority to implement removal or remedial actions
. Such actions may include, but not
be limited A installation of monitoring wells; collection and laboratory
testing of water, soil, and waste samples; cleanup and disposal of the illicit
discharge, and remediation of soil and/or groundwater. The property owner
and/or other person responsible illicit discharge an which
the release h -,c; eceurrpd shall be responsible for any costs incurred by the
Pub ' Department or its authorized agents in the conduct of such
remedial actions and shall be responsible for City expenses incurred due to the
illicit offidischarge; including but not limited to removal
and/or remedial actions.
c. Compliance with subsection r- � shall be achieved through the
implementation and maintenance of best management practice described in
the Storm Water Pollution Prevention Manual. The direst
shall initially rely on education and informational assistance to gain
compliance with subsection F d unless the dimer Administrator
determines a violation passprs goo a hazard to public health, safety,
or welfare, endangers any property and/or other property owned or maintain by the
....Me
.... ..........
City, d therefor should be addresse'l through immediate penalties. The Fired n
r or his or may demand immediate cessation 4
discharges and assess penalties for violations that are an imminent or substantial
danger to the health or welfare of persons or danger to the environment.
- Notice of Violation: Whenever the administrator or his .-. gr designee finds
that a person has violated a prohibition or failed to meet a requirement of this s Section,
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Renton Municipal Cade
he or she may order compliance by written notice of violation to the property owner
and/or responsible person, by first class and certified mail with return receipt requested.
Such notice may require without limitation:
(1) The performance of monitoring, analyses, and reporting by the violator;
(2) The elimination of illicit connections or discharges;
(3) That violating discharges, practices, or operations shall immediately cease and
desist;
(a) The abatement or remediation of storm water pollution or contamination
hazards and the restoration of any affected property; and
f fin
m Payment rvrie --nrr�as provided in RAW- it —�tB—EAv@F admlniswitFVc and
(5) The implementation of source control or treatment BMPs. Any person
responsible for a property or premise, which is, or may be, the source of an illicit
discharge, may be required to implement, at said person's expense, additional
structural and non-structural BMPs to prevent the further discharge of pollutants
to the municipal separate storm sewer system and/or waters of the State. These
BMPs shall be part of a stormwater pollution prevention plan (SWPP) as necessary
for compliance with requirements of the NPDES permit.
b. Requirement to Eliminate Illicit Connection: The Administrator or his or her
desig j sen b�prdancl/or
°ni y iir's class and certified mail with
return rete pt requested t the person ronsible for the
illicit q, +F� informing the property owner or person responsible for an illicit
connection to the MS4 stermwater dFainage system that elimiFiate M the connection
ted by a specified date.
Requirement to Elimina usl a to illicit Discharges EFneFgency
S.itua iens: The Administrator or his by written notice; sent
las certified mail with return receip equested to the prowner
and/or the person responsibly discharge, that a informing the property
owner or person responsible for an illicit `charge to the MS4
system that- eliminate that the dischari s WoMM by a specified date.
M
0
d. Sample„ and Analyse When the Administrator has
reason to believe that an illicit connection is resulting in an illicit discharge, the
Administrator OFF HE or he igmay sample and analyze the discharge and recover
the co f us ch sampling and analysis from t a property owner or person responsible for
such illicit connection or discharge pursuant to RMC 1-3-3, as now or as hereafter may be
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Renton Municipal Code
cl, in an enforcement precedes and require the person permitting or
maintaining the illicit connection and/or discharge to conduct ongoing monitoring at t#e
- person's ext#s e�.
e.. Right of Ap"OPM Administrative Decision: Any person aggrieved by an
administrative decision of the Administrator, or his or her designee, may appeal such
decision pursuant to RMC 4-8-110.
f. Any illicit connection and/or illicit discharge as set forth in this Section or
the Stormwater Pollution Prevention Manual is hereby declared to be a publ+s nuisance
pursuant to RMC 1-3-3, and as defined in RMC 1-3-4A.11.c.(23).
S. Reporting Requirements:
a. In the event of an illicit discharge or spill of hazardous material into the storm
water drainage system or waters of the City, State of Wasinl&oq gg I Lgj"@§,
said person �rB shall immediate!. notify the emergency
dispatch services (911)
b. In the event of an illicit discharge of non -hazardous material into the storm
water drainage system or waters of the City, State of Washington or United States,
said person with knowledge thereof shall immediately notify the Public Works
Department by phone at 425-430-7400, or in person iFnmedia%elI.
go Inspections, Investigation and lampling: The Administrator desi9
may inspect the facilities of any person to determine
compliance with the requirements of these regulations.
a. Access:
L The Administrator or his or her designee shall be permitted to
enter and inspect sites subject to regulation under this 1hapter
Section as often as may be necessary to determine compliance
hK&RA with this . at all reasonable hours for the
purpose of inspections, sampling or records examination.
ii. The Administrator 4 shall have the right to set up
on the prope+ necessary devices to conduct sampling, inspection,
compliance monitoring, and/or metering actions.
b. Compliance With Inspection Report:
Within thirty (30) days of receiving an inspection report from the P`blic
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Renton Municipal Code
® Department, the property owner or operator shall file with the
Department a plan and time schedule to implement any required
modifications to the site or to the monitoring plan needed to achieve
compliance with the intent of this Chapter or the NPDES
permit conditions. This plan and time schedule shall also implement all
of the recommendations of the Department.
O DRAINAGE PLAN DESIGN CRITERIA, DRAFTING STANDARDS AND CONTENTS:
The drainage plan shall be prepared in conformance with the Department's construction
plan drafting standards and contents, the City's Standard Specifications for Municipal
Construction and Standard Detail documents, and the design criteria, construction materials,
practices, and standard details contained in chapters 3, 4 and 5 of the current King County
Surface Water Design Manual; provided, that the Department's standards and design criteria
will take precedence and prevail in any interpretation of conflicting or contradictory
standards and design criteria; and provided further, that within designated urban separators
regulated in RMC 4-3-110, the 2005 King County Surface Water Design Manual Conservation
Flow Control Area Level 2 flow control standards are required. (Ord. 4269, 5-21-1990; Ord.
5132, 4-4-2005)
I REVIEW AND APPROVAL OF PLAN:
1. Timing and Process: All storm drainage plans prepared in connection with any of the
permits and/or approvals listed in subsection C1 of this Section shall be submitted for review
and approval to the Development Services Division. If no action is taken by the City after
submission of final drainage plans within forty five (45) days, then such plan is deemed
approved. (Ord. 3174, 11-21-1977)
2. Fees: Fees shall be as listed in RMC 4-1-1808. (Ord. 4722, 5-11-1998)
3. Additional Information: The permit application shall be supplemented by any plans,
specifications or other information considered pertinent in the judgment of the Administrator
or his _ _ duly authoriZed Feffesenta4iwe. (Ord. 3174, 11-21-1977)
® BONDS AND LIABILITY INSURANCE REQUIRED:
The Development Services Division shall require all persons constructing
retention/detention facilities to post with the Administrator surety and cash bonds or
certified check in the amount of one and one-half (1-1/2) times the estimated cost of
construction. Where such persons have previously posted, or are required to post, other such
bonds with the Administrator, either on the facility itself or on other construction related to
the facility, such person may, with the permission of the Director and to the extent allowable
by law, combine all such bonds into a single bond; provided, that at no time shall the amount
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Renton Municipal Code
thus bonded be less than the total amount which would have been required in the form of
separate bonds; and provided further, that such bond shall on its face clearly delineate those
separate bonds which it is intended to replace.
1. Construction Bond: Prior to commencing construction the person constructing the
facility shall post a construction bond in an amount sufficient to cover the cost of conforming
said construction with the approved drainage plans. In lieu of a bond, the applicant may elect
to establish a cash escrow account with his bank in an amount deemed by the Administrator
to be sufficient to reimburse the City if it should become necessary for the City to enter the
property for the purpose of correcting and/or eliminating hazardous conditions relating to
soil stability and/or erosion. The instructions to the escrowee shall specifically provide that
after prior written notice unto the owner and his failure to correct and/or eliminate existing
or potential hazardous conditions and his failure to timely remedy same, the escrowee shall
be authorized without any further notice to the owner or his consent to disburse the
necessary funds - the City of Renton for the purpose of correcting and/or eliminating such
conditions complained of. After determination by the Department that all facilities are
constructed in compliance with the approved plans, the construction bond shall be released.
2. Maintenance Bond: After satisfactory completion of the facilities and release of the
construction bond by the City, the person constructing the facility shall commence a three (3)
year period of satisfactory maintenance of the facility. A cash bond, surety bond or bona fide
contract for maintenance with a third party for the duration of this three (3) year period, to
be approved by the Administrator and to be used at the discretion of the Administrator to
correct deficiencies in said maintenance affecting public health, safety and welfare, must be
posted and maintained throughout the three (3) year maintenance period. The amount of the
cash bond or surety bond shall be in the amount of one and one-half (1-1/2) times the
estimated cost of maintenance for a three (3) year period.
3. Liability Policy: The person constructing the facility shall maintain a liability policy
during such private ownership with policy limits of not less than one hundred thousand
dollars ($100,000.00) per individual, three hundred thousand dollars ($300,000.00) per
occurrence and fifty thousand dollars ($50,000.00) property damage, which shall name the
City of Renton as an additional insured without cost to the City and which shall protect the
City of Renton from any liability, cost or expenses for any accident, negligence, failure of the
facility, omission or any other liability whatsoever relating to the construction or
maintenance of the facility. Said liability policy shall be maintained for the duration of the
facility by the owner of the facility, provided that in the case of facilities assumed by the City
of Renton for maintenance pursuant to subsection # 1 of this Section, said liability policy shall
be terminated when said City maintenance responsibility commences.
CITY ASSUMPTION OF MAINTENANCE:
1. Maintenance of Facilities by City Authorized: The City of Renton is authorized to
assume the maintenance of retention/detention facilities after the expiration of the three (3)
year maintenance period in connection with the subdivision of land if:
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Renton Municipal Code
a. All of the requirements of subsection4 1 of this Section have been fully complied
with;
b. The facilities have been inspected and approved by the Department after their first
year of operation;
c. The surety bond required in subsection 91 of this Section has been extended for
one year covering the City's first year of maintenance;
d. All necessary easements entitling the City to properly maintain the facility have
been conveyed to the City; M
e. it is recommended by the Administrator and concurred in by the City Council that
said assumption of maintenance would be in the best interests of the City.
2. Notification of Defect Required: The owner of said property shall throughout the
maintenance period notify the City in writing if any defect or improper working of the
drainage system has come to his = notice. Failure to so notify the City shall give the City
cause to reject assumption of the maintenance of the facility at the expiration of the three (3)
year maintenance period, or within one year of the discovery of the defect or improper
working , whichever period is the latest in time.
I RETROACTIVITY RELATING TO CITY MAINTENANCE OF SUBDIVISION FACILITIES:
If any person constructing retention/detention facilities and/or receiving approval of
drainage plans prior to the effective date of this Section re -assesses the facilities and/or plans
so constructed and/or approved and demonstrates, to the Administrator's satisfaction, total
compliance with the requirements of this Section the City may, after inspection, approval
and acknowledgment of the proper posting of the required bonds as specified in subsection
of this Section, assume maintenance of the facilities. (Ord. 3174, 11-21-1977)
DRAINAGE PLAN REVIEW PROCEDURES:
The drainage plan and supportive calculations shall be reviewed by the Department using
the Department's construction plan review procedures in coordination with all other
applicable City permit review procedures.
1. Tests: Whenever there is insufficient evidence of compliance with any of the
provisions of this' or Code or evidence that any material or construction does not
conform to the requirements of this - Code, the Administrator
may require tests as proof of compliance to be made at no expense to this jurisdiction. Test
methods shall be as specified by this - Code or by other recognized test standards. If
there are no recognized and accepted test methods for the proposed alternate, the
Administrator shall determine test procedures. Suitable performance
of the method or material may be evidence of compliance meeting the testing requirement.
(Ord. 4269, 5-21-1990)
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Renton Municipal Code
■ ALTERNATE PROVISIONS FOR MATERIAL, CONSTRUCTION AND DESIGN:
See RMC 4-9-250E. (Ord. 4722, 5-11-1998)
■ MODIFICATIONS OF CODE REQUIREMENTS:
See RMC 4-9-250D. (Ord. 4722, 5-11-1998)
P. 1WERABILIM
If anOWsion, subsection, sentence, clause or phrase of thlftec a or the
1p'plication thereof to any person or circumstances is held invalid, the remaining portions of
this Section and the agklication of,such provisions to other persons or circumstances shall not
be affected thereby,!
Q. VIOLATIONS OF THIS SECTION AND PENALTIES:
A viof this Section shall be a civil infraction upon the first
offense pursuant to RMC 1-3-2 (Ord. 4856, 8-21-00; Ord. 5196, 2-13-06). See also, RMC 4-6-
110. AAV 6Uaseq+UeRt OF Felaeat- via-lation of this SP-GUend:TSUant toRR4r-, 1-3tal), shall -ba
2005).
SECTION II. RMC 4-6-100 is hereby amended to add the following definitions:
ILLICIT CONNECTION: An unlawful connection to the municipal stormwater sewer system
that conveys pollution or contaminants or anything not entirely composed of surface water
and storm water directly into such facilities.
ILLICIT DISCHARGE: An unlawful conveyance of pollution or contaminants or anything not
entirely composed of surface water and storm water directly or indirectly into the municipal
stormwater sewer system.
BEST MANAGEMENT PRACTICES (BMPs): Means the methods of improving stormwater
quality by preventing or reducing the discharge of pollutants, directly or indirectly into
stormwater, surface water and groundwater. Such practices encompass a variety of
managerial, operational, and structural measures that will reduce the amount of
contaminants in stormwater and improve the quality of water resources. BMPs are
separated into two broad categories: source control and treatment. Source control BMPs
prevent contaminants from entering water bodies or stormwater runoff. Treatment BMPs
are structures that treat stormwater to remove contaminants. See also, RMC 4-11-020 for
BEST MANAGEMENT PRACTICES --WETLANDS.
BMPs: See, Best Management Practices, supra, and RMC 4-11-020.
MS4: See, Municipal Separate Storm Sewer System.
MUNICIPAL SEPARATE STORM SEWER SYSTEM: Means a conveyance or system of
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Renton Municipal Code
conveyances (including roads with drainage systems, municipal streets, catch basins, curbs,
gutters, ditches, man-made channels, or storm drains): a. owned or operated by the City of
Renton; b. designed or used for collecting or conveying stormwater; C. which is not part of a
Publicly Owned Treatment Works (POTW); and d. which is not a combined sewer.
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) STORMWATER
DISCHARGE PERMIT: Means a permit issued by the Environmental Protection Agency (EPA)
(or by the Washington Department of Ecology under authority delegated pursuant to 33 USC
Section 1342(b)) that authorizes the discharge of pollutants to waters of the United States,
whether the permit is applicable on an individual, group, or general area -wide basis.
NPDES: See, National Pollutant Discharge Elimination System Stormwater Discharge Permit.
POTW: See, Publicly Owned Treatment Works.
PUBLICLY OWNED TREATMENT WORKS: Means any device or system used in treatment of
municipal sewage or industrial wastes of a liquid nature which is publicly owned.
following:
SECTION III. Chapter RMC 4-11 "DEFINITIONS" is hereby amended to add the
RMC 4-11-020: BMPs: Best Management Practices, see supra, and RMC 4-6-100.
RMC 4-11-090: ILLICIT CONNECTION: See, RMC 4-6-100.
ILLICIT DISCHARGE: See, RMC 4-6-100.
RMC 4-11-130: MS4: See, RMC 4-6-100.
MUNICIPAL SEPARATE STORM SEWER SYSTEM: See, RMC 4-6-
100.
RMC 4-11-140: NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)
STORMWATER DISCHARGE PERMIT: See, RMC 4-6-100.
NPDES: See, RMC 4-6-100.
RMC 4-11-160: POTW: See, RMC 4-6-100.
RMC 4-11-160: PUBLICLY OWNED TREATMENT WORKS: See, RMC 4-6-100.
SECTION IV. RMC 1-3-4 "Definitions" is hereby amended to add RMC 1-3-
4A.11.c.(23) as follows:
(23) Violations of surface and storm water drainage standards and regulations, Chapter 4-6,
R&
SECTION V. This ordinance shall be effective upon its passage, approval, and fwe
thirty (30) days after publication.
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I
CITY OF RENTON
AMENDMENTS TO THE 2009 KING COUNTY
STORMWATER POLLUTION PREVENTION MANUAL
DRAFT
PREFACE -- HOW TO USE THIS DOCUMENT
GENERAL INTRODUCTION
The City of Renton has adopted the 2009 King County Stormwater Pollution
Prevention Manual (SPPM) and this Amendment to the SPPM (Amendment),
effective , 2009. The SPPM along with the Amendment provides detailed
information for businesses, residents, managers and owners of properties in the
City, and describes the actions we are all require to take in order to reduce the
contamination of stormwater, surface water and groundwater. The Amendment
outlines all changes, additions, and deletions to the SPPM.
PURPOSE AND NEED OF THIS DOCUMENT
The City's adoption of the SPPM and accompanying Amendment was the method
used by the City to comply with new federal stormwater regulations. More
specifically, Phase I of the National Pollutant Discharge Elimination System
(NPDES) establishes regulations sets forth in the permit application requirements for
stormwater discharges associated with industrial activity; discharges from a
municipal separate storm sewer systems serving a population of 250,000 or more;
and discharges from municipal separate storm sewer systems (MS4s) serving a
population between 100,000 to 250,000.
The Phase 11 rule extends coverage of the National Pollutant Discharge Elimination
System (NPDES) program to certain "small" MS4s. The Phase II permit covers
certain urbanized areas of Washington State that were previously not covered under
Phase I. Phase II communities are identified under the rules as jurisdictions that:
1. Own and operate a storm drain system;
2. Discharge to surface waters;
3. Are located in urbanized areas; and
4. Have a population greater than 1,000.
With a 2000 census population of approximately just over 50,052, the City of Renton
falls under the jurisdiction of Phase II requirements.
Washington State's Department of Ecology (Ecology), who oversees stormwater
requirements in the state, has developed the 2005 Stormayater Management Manual for
Western Washington (Ecology Manual). Volume IV of the DOE Manual complies with
CITY OF MENTON STORMWATER POLLUTION PREVENTION MANUAL
COR 2009_SPPM.00c PAGE S OF 7
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CITY OF RENTON STORP rER POLLUTION PREVENITION MANU
the NPDES Minimum Requirement #3: Source Control. In addition, Ecology has
approved the 2009 SPPM as equivalent to the Ecology Manual.
The SPPM and accompanying Amendment present a series of information sheets
listing pollution prevention practices, source control BMPs that are require for
residential and commercial activities in order to prevent pollutants from
contaminating stormwater or entering water and improve the quality and beneficial
uses of the City's water resources.
HOW TO USE THIS DOCUMENT
This document shall be used in coordination with the 2009 SPPM for the following:
■ To translate specific wording or reference from King County to the City.
■ To cross reference City ordinances in lieu of King County ordinances.
■ To provide a linkage or reference to other City requirements such as more
restrictive requirements outlined in the City's Aquifer Protection Ordinances.
■ To provide exceptions and additions to the SPPM.
The SPPM will be used in its entirety except as outlined in this document.
Exceptions and additions to the SPPM will be organized and referenced by chapter
and section in the same mariner as the SPPM. Some global changes will also be
applied throughout the entire SPPM. The user shall override the references to other
documents as indicated within this Amendment.
AMENDMENT ORGANIZATION
The information presented in this Amendment is organized as follows
■ Preface - How to use this Document: This preface provides instruction for using
the City of Renton's Amendment to the 2009 SPPM. It also defines terms in the
SPPM manual that are used differently for the City of Renton; City departments
that are equivalent to county departments referred to in the SPPM; City
ordinances that take the place of corresponding county ordinances, and
designations from the SPPM that do not apply to proposals in the City of
Renton as shown below.
■ Chapter I - "Overview": The City of Renton has made several changes to
Chapter I of the SPPM. This Amendment to Chapter 1 provides replacement
text for the sections that are changed as shown below.
The Following Exemptions for MBP Implementation does not apply to the City
of Renton.
Are implementing and maintaining a farm management plan approved by
the King County Conservation District
Are implementing BMWs in compliance with King County Code 21A.30,
which addresses animal livestock keeping practices.
CITY OF RENTON DRAFT STORMWATER DESIGN MANUAL UPDATE
COR 2009_SPPM.00c PACE 2 OF 7
I
CITY ZENTON STORMWATER POLLUTION I rENTION MANUAL -DRAFT
Are engages in forest practices, with the exemption of Class IV general
practices
Apart from these changes, the King County version of Chapter I applies for
proposals in the City of Renton.
■ Chapter II - "Stormwater Problem: Your Role": The City of Renton has made
minor changes to Chapter II of the SPPM. This Amendment to Chapter Il
provides replacement text for the sections that are changed. Apart from these
changes, the King County version of Chapter II applies for proposals in the City
of Renton as shown below.
■ Chapter III - "Stormwater Pest Management Practices for Specific Activities":
The City of Renton has made minor changes to Chapter III of the SPPM. This
Amendment to Chapter III provides replacement text for the sections that are
changed. Apart from these changes, the King County version of Chapter III
applies for proposals in the City of Renton as shown below.
■ Chapter IV - "Residential Best Management Practice": The City of Renton has
made minor changes to Chapter IV of the 2009 SPPM. This Amendment to
Chapter IV provides replacement text for the sections that are changed. Apart
from these changes, the King County version of Chapter 4 applies for proposals
in the City of Renton as shown below.
■ Chapter V - "BMP INFO Sheets": The City of Renton has made minor changes
to Chapter V of the 2009 SPPM. This Amendment to Chapter V provides
replacement text for the sections that are changed. Apart from these changes,
the King County version of Chapter V applies for proposals in the City of
Renton as shown below.
■ Chapter VI _ "TechnicaI Assistant": The City of Renton has made minor
changes to Chapter VI of the 2009 SPPM. This Amendment to Chapter VI
provides replacement text for the sections that are changed. Apart from these
changes, the King County version of Chapter VI applies for proposals in the
City of Renton as shown below.
CITY AMENDMENTS TO CHAPTER I -Vi
CITY EQUIVALENTS FOR COUNTY AGENCIES
For proposals located within the City of Renton, all references in the SPPM to the
following County departments are to be replaced by reference to the City of Renton
Surface Water Utility and/or City of Renton Development Services Division
(RDSD):
■ DDES (Department of Development and Environmental Services)
■ DNR (Department of Natural Resources)
■ WLR (Water and Land Resources)
THE CITY OF RENTON STORMWATER POLLUTION PREVENTION MANUAL
COR 2009_SPPM.00c PAGE 3 OF 7
CITY OF RENTON STORP rER POLLUTION PREVENITION MANU
Unless the context requires otherwise, any reference to "County", "King County" or
"Unincorporated King County" shall refer to the City of Renton and any reference to
County Staff shall refer to the City Manager or designee, unless specifically referring
the Development Services Division as indicated above.
CITY EQUIVALENTS FOR COUNTY PHONE NUMBERS
For proposals Iocated within the City of Renton, all references in the SPPM to the
following County phone numbers are to be replaced by reference to 425-430-7200
N 206-296-1.900
Unless the context requires otherwise, any reference to "County", "King County" or
"Unincorporated King County" shall refer to the City of Renton and any reference to
County Staff shall refer to the Public Works Department Administrator or designee,
unless specifically referring the Development Services Division and/or Surface
Water Utility as indicated above.
CITY EQUIVALENTS FOR COUNTY ORDINANCES
For proposals in the City of Renton, all reference in the SPPM to the following
ordinances or municipal codes shall be replaced by reference as indicated in the
following table:
CITY OF RENTON DRAFT STORMWATER DESIGN MANUAL UPDATE
COR 2009_SPPM.DOC PAGE 4 OF 7
CITY ZENTON STORMWATER POLLUTION I VENTION MANUAL -DRAFT
In general, references to the King County Critical Areas Ordinance (KCC 21A) are to
be replaced by reference to the Renton Municipal Code (RMC) Title IV, particularly,
chapter RMC IV -3, Environmental Regulations and Overlay Districts.
THE CITY OF RENTON STORMWATER POLLUTION PREVENTION MANUAL
COR 2009_SPPM.Doc PAGE 5 OF 7
King County
Code Description
r
Description
This term sloes not apply
KCC 2.98 Critical Drainage Areas
Not Applicable
KCC 16.82
BUILDING AND CONSTRUCTION
RMC IV
Development Regulations
STANDARDS -Clearing and Gradin
KCC 21A.14
Development Standards Design
RMC IV -4-4-030
City -Wide Property
Requirements
Development Standards:
Development Guidelines and
Regulations - General
KCC 21A.24
Critical Areas
RMC IV -4-3-050
Critical Areas Regulations
KCC 21A.06
Technical Terms and Land Use
RMC IV4-11
Definitions
Definitions
KCC 21A,06 shall also apply
KCC 20.14
Basin PIans
RMC IV -4-4-030
Development Guidelines and
Regulations - General
KCC 25
Shoreline Management
RMC IV4-3-090
Shoreline Master program
Regulations
KCC 9*
Surface Water Management
RMC IV -4-6-030
Drainage (Surface Water)
9.02
General Provisions
Standards
9.04
Surface Water Runoff Policy
9.08
Surface Water Management
Program
9.12
Water Quality
RMC IV -4-6-030
DeveIopment Regulations
9.14
Groundwater Protection
RMC IV -4-3-050
Critical Areas Regulations
In general, references to the King County Critical Areas Ordinance (KCC 21A) are to
be replaced by reference to the Renton Municipal Code (RMC) Title IV, particularly,
chapter RMC IV -3, Environmental Regulations and Overlay Districts.
THE CITY OF RENTON STORMWATER POLLUTION PREVENTION MANUAL
COR 2009_SPPM.Doc PAGE 5 OF 7
CITY OF RENTON STORI TER POLLUTION PREVENITION MANI
CITY EQUIVALENTS FOR COUNTY MAPS
CITY OF RENTON DRAFT STORMWATER DESIGN MANUAL UPDATE
COR 2009_SPPM. DOC PAGE 6 OF 7
King County . or
of • •
Flow Control Applications Map
Contact Renton Development Service Division
Coal Mine Hazard Areas Map
Replace with:
Coal mine hazard areas within the jurisdiction of the
City of Renton, as defined in RMC IV -3-050 and the
City of Renton Coal Mine Hazards map (Figure 4-3-
050Q3a(i)).City of Renton Landslide Hazard Drainage
Area Ma
Landslide Hazard Area and Landslide
Replace with:
Drainage Areas Map
Landslide hazard areas within the jurisdiction of the
City of Renton, as defined in RMC IV -3-050 and the
City of Renton Landslide Hazards map (Figure 4-3-
050Q3c(i)).City of Renton Landslide Hazard Drainage
Area Map.
Water Quality Applications Map
King County Map does not apply_ Basic or Enhanced
Water quality treatment BMPs required will be based
on Iand use and thresholds specified in this
Amendment.
Flood hazard area (as defined in KCC 21A.06)
Replace with:
Frequently flooded areas include all areas of special
flood hazards within the jurisdiction of the City of
Renton, as defined in RMC IV -3-050 and the City of
Renton Flood Hazards Ma (Figure 4-3-050Q2 .
Erosion hazard area
Replace with:
Erosion hazard areas include all erosion prone areas
within the jurisdiction of the City of Renton, as defined
in RMC IV -3-050 and the City of Renton Erosion
Hazards Ma Fi re 4-3-050Q3b i
Steep slope hazard area
Replace with:
(no map referenced in the KCSWDM)
Steep slope hazard areas include all steep sIopes within
the jurisdiction of the City of Renton, as defined in
RMC IV -3-050 and the City of Renton Steep Slopes
Ma (Figure 4-3-050Q3e i .
Critical Aquifer recharge area (as defined in
Replace with:
KCC21A.06)
Aquifer Protection Zones are areas within the
jurisdiction of the City of Renton, as defined in RMC
IV -3-050 and the City of Renton Aquifer Protection
Zones Map (Figure 4-3-050Q2).
CITY OF RENTON DRAFT STORMWATER DESIGN MANUAL UPDATE
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CITY ZENTON STORMWATER POLLUTION I JENTION MANUAL -DRAFT
CITY EQUIVALENTS FOR MISCELLANEOUS TERMS
Agricultural Project
tural Zone
Replace with:
Resource Conservation (RC) Project
Resource Conservation Zone
CONFLICTS IN APPLICATION OF SPPM MODIFICATIONS TO CITY OF RENTON
Any conflict that arises between the SPPM and this Amendment to the SPPM shall
be interpreted by the City of Renton Surface Water Utility. The Surface Water Utility
will have final decision on all interpretations. S
THE CITY OF RENTON STORMWATER POLLUTION PREVENTION MANUAL
COR 2009_SPPM.DOC PAGE 7 O 7
King County
Stormwater
Pollution
Prevention
Manual
Best Management Practices
for Commercial, Multi -Family
and Residential Properties
January 2009
Prepared by:
King County Department of Natural Resources and Parks
Water and Land Resources Division
Stormwater Services Section
11
The King County Stormwater Pollution Prevention Manual was developed to comply
with requirements of the Federal Clean Water Act -National Pollutant Discharge
Elimination System Program and the State Puget Sound Water Quality Management
Plan-Stormwater Program. The intent of these programs is to maintain and improve the
quality and beneficial uses of our water resources. The widespread implementation of
best management practices is regarded as one of the best solutions to achieving this goal.
This manual provides detailed information for businesses, residents, managers, and
owners of property in unincorporated King County, and describes the actions we are all
required to take to reduce the contamination of stormwater, surface water, and
groundwater.
Note: This manual replaces the King County Stormwater Pollution Prevention Manual,
Best Management Practices for Businesses, dated February 2005.
King County Executive
Ron Sims
Metropolitan King County Council
Bob Ferguson, District 1
Larry Gossett, District 2
Kathy Lambert, District 3
Larry Phillips, District 4
Julia Patterson, District 5
Jane Hague, District 6
Pete von Reichbauer, District 7
Dow Constantine, District S
Reagan Dunn, District 9
Department of Natural Resources and
Parks
Theresa Jennings, Director
Bob Bums, Deputy Director
Water and Land Resources Division
(WLRD)
Mark Isaacson, Division Director
Joanna Richey, Assistant Division Director
Curt Crawford, P.E., Section Manager
Primary Contributing Staff
Douglas Navetski, Supervising Engineer
Susan Clarice, Former Senior WQ Engineer
Valerie Monsey, Former Engineer
Kate Rhoads, Former Sr. WQ Engineer
Primary ,Supporting Staff (WLRD)
Mary Lear, P.E., Engineer
Bob Gilland, Administrative Specialist
Chapter I provides an overview of Best Management Practices and how to use this
manual. Chapter III, "Stormwater Best Management Practices for Specific Activities"
applies to commercial, industrial, agricultural, public, and multifamily residential
properties. Chapter IV, "Residential Best Management Practices" applies to single family
residential properties.
Chapters II, V, and VI provide supporting material with information on water quality
problems, best management practices, and references and phone numbers for technical
assistance.
Determine which Activity Sheets apply (Chapter III — Commercial or IV —
Residential).
Find the step-by-step instructions for working through the implementation of best
management practices.
If Chapter III applies, complete the Activity Worksheet (located in Chapter III) to
identify which Activity Sheets you should review.
This Stormwater Pollution Prevention Manual presents pollution prevention practices
for all property owners in unincorporated King County. For construction projects that
require King County permits, and have stormwater quantity and quality control
requirements, the King County Surface Water Design Manual (KCSWDM) must be
used. If you are involved in a redevelopment or property improvements on an existing
site, structural Best Management Practices will be required as part of that permit_ See
Special Requirement #4: Source Controls, in Chapter I of the King County Surface
Water Design Manual. The Activity Sheets in this manual can be used when developing a
Construction Stormwater Pollution Prevention Plan as required in the KCSWDM.
Table of Contents
Describes what is required of you as a resident, property owner, or business owner or
manager, and provides an introduction to the use of this manual.
Provides information on how water becomes polluted and the effects of pollutants on
water quality.
Describes stormwater best management practices that are required for various
commercial, industrial, public, and multifamily residential activities.
Describes stormwater best management practices for single family residential property
owners.
Provides detailed information on how to implement many stormwater best management
practices.
Provides information on other programs or services that can provide assistance in
implementing stormwater best management practices.
About This Manual....
Best Management Practices... What Are They?
Manual Coverage ........................................
Exemptions...........................................................
Step -by -Step Approach .........................................
Measuring Compliance .........................................
..... I— ...................... 1
............................... 2
..... 2
.......................................3
...,.. ... I ..... I .................. 3
........................... 6
Implementation Schedule. ............................................................................ 6
Other Agency Requirements........................................................................8
On -Site Storm Drainage System Worksheet................................................9
Alternative Best Management Practices (BMP) Request.
11
King County's water resources — its streams, lakes, wetlands, groundwater, and Puget
Sound ---- play an important role in the quality of life we enjoy. They provide us with
recreation and drinking water, support tourism and salmon, and are used by industry. These
waters, however, are vulnerable to pollution from a wide variety of human activities.
Many of our water pollution problems are due in large part to pollutants that are washed off
from land by storms. The quality of "stormwater" from residential properties, public
facilities, commercial and industrial businesses, and agricultural lands is an increasing
concern nationwide. Many people believe that stormwater 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 water quality problems.
The federal Clean Water Act mandates that cities and counties control the quality of
stormwater runoff. One way to achieve this requirement is to implement pollution
prevention measures on individual properties. To meet the requirements of the Clean Water
Act and to sustain our quality of life, the King County Council passed King County Code
9.12 (Water Quality) in November 1992 .The code has been updated at periodic intervals
with the last update effective October 2008.
This manual applies to those residential, commercial, industrial, governmental, and
agricultural activities in unincorporated King County that have the potential to contribute
pollutants to stormwater runoff or directly to receiving waters. Stonnwater 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 the site, it ends up in a stream, river, lake, wetland,
groundwater, or Puget Sound.
Contaminated stormwater can negatively affect every water body it enters. Therefore, this
manual provides detailed information on how to reduce the contamination of surface water,
groundwater, and stormwater from activities on our properties. It shows that we are all
doing our part to protect our quality of life.
Chapter i describes what is expected of you as a property owner, business/agency owner, or
manager and provides a beginning point on the use of this manual.
Chapter 11 provides information on how water becomes polluted and the effects of
pollutants on water quality.
January 2009 King County Stormwater Pollution Prevention Manual
Chapter III describes stormwater best management practices that are required for various
commercial, industrial, public and multifamily residential activities.
Chapter IV describes stormwater best management practices for single family residential
properties.
Chapter V provides detailed information on how to implement many stormwater best
management practices.
Chapter VI provides information on other programs or services that can provide assistance
in implementing the stormwater best management practices.
BEST MANAGEMENT PRACTICES.... WHAT ARE THEY?,
The methods of improving stormwater quality, and thus surface water and groundwater, are
called best management practices (BMPs). BMPs encompass a variety of managerial,
operational, and structural measures that will reduce the amount of contaminants in
stormwater and improve the quality of our water resources.
BMPs are separated into two broad categories: source control and treatment As the name
implies, source control BMPs prevent contaminants from entering water bodies or
stormwater runoff. Some source control BMPs are operational, such as checking regularly
for leaks and drips from equipment or vehicles, covering materials that have the potential to
add pollutants to surface water if rainwater comes in contact with the materials, and
educating employees about site clean-up procedures. Other source control BMPs require
use of a structure to prevent rainwater from contacting materials that will contaminate
stormwater runoff. Examples of these BMPs include a covered area or berm to prevent
clean stormwater from entering work areas.
In contrast, treatment BMPs are structures that treat stormwater to remove contaminants.
Most treatment BMPs require elaborate planning, design, and construction. No treatment
BMP is capable of removing 100 percent of the contaminants in stormwater.
The goal of King County's water quality compliance program is to reduce the
contamination of water resources through emphasis on source control BMPs because these
are very effective and relatively inexpensive.
This manual applies to all properties in unincorporated King County. It is intended to
cover every activity considered to have the potential to contaminate surface, storm, or
groundwater. Anyone involved in a particular activity, whether as a property owner,
resident, employee, supervisor, manager, or landlord must take part in implementing the
appropriate BMPs selected from this manual_
Note: Now development activities and significant redevelopment of a site are subject to
1 This manual works in a modular format so that property owners only receive the information that is pertinent to
their site. Therefore the activity sheets located in Chapter III (business activities) and Chapter IV (single family
residential activities) may need to be obtained by request.
January 2009 King County Stormwater Pollution Prevention Manual
other stormwater management requirements set forth in the King County Surface Water
Design Manual.
If you are already implementing BMPs according to another federal, state, or local
program, you may not have to implement the BMPs in this manual. In addition, people who
are voluntarily implementing BMPs may also be exempt. You are exempt if you:
• Have obtained and are complying with a general or individual permit under the
National Pollutant Discharge Elimination System (NPDES) Stormwater Permit
Program.
• Are implementing and maintaining a farm management plan approved by the King
Conservation District.
• Are implementing BMPs in compliance with King County Code 21A.30, which
addresses animal and livestock keeping practices.
• Are a public facility implementing BMPs in compliance with the stormwater
management program of the County's NPDES municipal stormwater permit.
• Are engaged in forest practices, with the exception of Class IV general forest practices.
• Are voluntarily implementing other BMPs, which are equivalent measures, methods, or
practices to the BMPs in this manual. Contact the King County Water and Land
Resources Division (WLRD) to determine equivalency.
Please understand that these exemptions are only from the requirements of this manual. If
you are exempted for one or more of the reasons listed above, King County assumes that
you are implementing the appropriate BMPs. If the County Ends that you have not
implemented BMPs, or that the BMPs that you have implemented are not effectively
addressing the discharge of contaminants, then you may be required to comply with this
manual. Everyone must implement BMPs, but how each individual goes about it, and
through what program, may differ from one situation to the next. The following is a step-
by-step approach to comply with the BMP requirements.
APPROACH.STEP BY STEP
Step 1 - Determine Your Status
Determine if you are obligated to comply with the BMPs by checking the list of
exemptions in this chapter. If you are not exempt, then you must comply with the BMPs in
this manual.
Determine whether Chapter III or Chapter IV is applicable to your property. Chapter III
applies to all commercial, industrial, agricultural, public, and multifamily residential
properties. Use Chapter IV for single family residential properties.
January 2009 King County stormwater Pollution Prevention Manual
Step 2 - Evaluate Existing Conditions
Determine which activities in Chapter III or Chapter IV of this manual are applicable to
your property.
Review the applicable activity sheets, then evaluate whether you have any practices or
measures already in place that protect water quality from pollutants generated by the
activities and determine what additional measures you may need to implement. Activity
sheets can be found on our Web site at
http: //www.kingeounty. gov/environment/waterandiand/stormwater/documents/pol lution-
prevention-manual. aspx.
You will need to gain familiarity with the stormwater drainage patterns and drainage
system on your site. To control stormwater pollution it is important to understand your
drainage system. You can use the site plan graph paper (in the back of this chapter) to
sketch out the location of the drainage system on your property. This will help you locate
storage and activity areas in order to minimize the chance of spills or pollutant discharges
to your drainage system.
Step 3 - Seek Assistance
At this point or at any time during this process, you can request a free on-site consultation
from WLRD. Engineers are available to walk through your site discussing existing site
conditions and necessary BMPs and providing assistance with implementation. To request
an on-site consultation, call 206-296-1900.
Step 4 - Check Your Internal Floor Drains and Plumbing System Connections
A common problem that can cause significant stormwater pollution is discharges other than
stormwater to the storm drainage system. Examples are discharges from internal floor
drains, appliances, industrial processes, sinks, and toilets that are connected to the nearby
storm drainage system. These discharges must go to the sanitary sewer system, a holding
tank, an on-site process water treatment system, or a septic system. You must correct these
illicit discharges. If you have any question as to whether your discharge is allowable,
contact WLRD at 206-296-1900.
For information on how to check for illicit connections see BMP Info Sheet 1 in Chapter V.
You can also ask for help from your local sewer utility. If you find out that your internal
drains are improperly connected to the storm drainage system, they will need to be either
removed, permanently plugged, or connected to the sanitary sewer, septic system, on-site
treatment system, or a holding tank.
Step 5 - Develop an Implementation Strategy
Look at your property as a whole and determine how the BMPs you implement will work
together to improve overall runoff quality from your property_ The activity sheets identify
specific required BMPs, usually followed with the phrase "or equivalent method, measure,
or practice." There may be acceptable BMPs that are not listed in the manual. Be creative
in assessing your own needs and the constraints that you may face on your property. You
are welcome to implement the stated BMP or an alternative BMP you believe better suits
your particular situation. If you are interested in pursuing an alternative BMP, fill out and
mail an Alternative BMP Request Form to WLRD. A copy of this form is provided at the
January 2009 King County Stormwater Pollution Prevention Manual
end of this chapter.
Your BMP implementation strategy should be a well thought out approach to controlling
runoff pollution from your site. You do not have to develop or submit any written plan.
Step 6 - Implement the Nonstructural Source Control BMPs
First, implement the nonstructural operational BMPs that typically do not require extensive
construction. Examples include having spill control and cleanup materials on site, using
drip pans or drop cloths when conducting day to day activities, and sweeping instead of
hosing down an area to a storm drain.
Step 7 - Implement, if Necessary, the Structural Source Control BMPs
Second, implement the structural source control BMPs that may require a building permit
or require larger capital expenditures. Examples include constructing a building to enclose
a work activity that is currently in the open, or berming a storage area to redirect runoff.
Step 8 - Implement, if Necessary, a Treatment BMP
If a treatment BMP is determined to be necessary for your site, you must have an
acceptable design prepared and approved by WLRD before it is constructed or installed.
You may be required to use the King County Surface Water Design Manual when
designing and receiving approval of treatment BMPs. Once your BMP design has been
approved by WLRD and a permit issued (if necessary) from the Department of
Development and Environmental Services, the construction process may begin.
Step 9 -Keep Records
Keep copies of your appropriate activity sheets and other documentation on implementing
BMPs. You may use records to illustrate your compliance with this manual, and as
references for information on BMPs and whom to call for assistance. You can also use the
manual as a training tool for new employees.
Step 10 - Maintain your BMPs
Business owners and property managers must ensure employees are carrying out
operational or nonstructural source control BMPs. Employee education should be a
continuous process for effective BMP implementation. The best way to make BMP
maintenance routine is to schedule BMP checks and designate responsible individuals to be
your BMP inspectors. As new employees join your company or agency, make sure to
involve them in your pollution control efforts.
Single family residential properties are also required to maintain any needed BMPS, for
example maintaining your storm drainage system.
Step 11 -Evaluate Your BMPs
After a year of implementing BMPs take some time to evaluate your BMPs and your
decisions. Be aware of new technology. Is everything working as expected? Has your
property use changed? Do you now know of something that can be done better?
Step 12 - Questions?
If you have questions or need assistance, please call WLRD at 206-296-1900.
January 2009 Icing County Stormwater Pollution Prevention Manual
ITIM-3113111reworty,
Compliance with the manual means implementing the required Best Management Practices
(or approved alternatives) and preventing the discharge of contaminants into the storm
drainage system, surface waters, and groundwater. There are no requirements for
monitoring your discharges or for submitting a BMP plan. Please keep in mind that the
intent of the County code and the BMPs is to reduce the contamination of surface and
stormwater or groundwater in the most efficient and least costly way.
In the manual, the County has identified general sets of required BMPs to reduce such
discharges_ The BMPs are intended to comprehensively cover all activities and give
flexibility for the variety of properties in the county. There are properties, however, where
implementing the minimum BMPs may not adequately reduce the discharge of pollutants.
Therefore, it is important to spend time evaluating your property and your activities before
simply implementing the minimum requirements. You are encouraged to contact WLRD
for an on-site consultation for assistance in evaluating your site and implementing the
BMPs.
You may find that an alternative BMP would work better on your site. To implement an
alternative you must complete a short application (included in the back of this chapter) and
submit it to King County WLRD for approval.
If you are implementing the minimum BMPs and there are still significant contaminated
discharges from your site, WLRD staff will ask you to address those discharges even
though you are doing the minimum BMPs_ If you have implemented BMPs but have not
maintained them and they are not working, you will need to take additional action. This
action will be decided in consultation with you and could include additional source control
BMPs, installation of treatment BMPs, or other actions to control the pollutants.
In determining the need for additional BMPs and the time frame for action, WLRD will
consider whether you have made substantial progress and a good faith effort in reducing
contaminated discharges and improving the quality of your stormwater. The County's intent
is to work with you to implement the BMPs most appropriate for your situation to prevent
contamination of our water resources.
If you have questions or need assistance in determining appropriate BMPs for your
property, call WLRD at 206-296-1900.
IMPLEMENTATION SCHEDULE
By law, the County's first response to BMP implementation is to provide technical
assistance to property owners. Once contact is made between WLRD and a property owner,
an individualized implementation schedule will be established.
BMPs that require a building permit may take longer to implement. People will not be held
liable for noncompliance for delays associated with obtaining a building permit. WLRD
also recognizes that some property owners will have more requirements to meet than
January 2009 King County Stormwater Pollution Prevention Manua!
others. WLRD will be looking for evidence that a property owner is actively pursuing
compliance, meaning a good faith effort to implement the BMPs. This may mean
implementing the nonstructural BMPs according to the schedule, showing progress in
providing required information, and actively planning for completion of more costly ones.
A schedule of expected implementation will inform the WLRD staff of your effort toward
gaining compliance. The County will not take enforcement action if a good faith effort by
the property owner is being pursued to implement BMPs.
January 2009 King County Stormwater Pollution Prevention Manual
Please note that other federal, state, and local agencies enforce regulations that may relate to
your implementation of Best Management Practices. For example, before discharging process
wastewater to the sanitary sewer, you will need to obtain permission from your local sewer
authority and the King County Wastewater Treatment Division Industrial Waste Section (if
within the service area).
King County Surface Water Design Manual
• Drainage requirements, and erosion and sediment control for new development and
redevelopment
King County Critical Areas and Clearing and Grading Ordinances
• Land use regulations protecting environmentally sensitive areas and public health and safety
King County Fire Code
• Storage and handling of flammable, combustible, and hazardous materials
King County Animal Regulations (Livestock)
• Raising and keeping of livestock
Seattle -King County Department of Public Health
• Solid waste
• Septic systems
+ Structural pesticide applicators
King County Wastewater Treatment Division Industrial Waste Section and Local Sewer
Authorities
• Acceptance of process water or stormwater to sanitary sewers
Washington State Department of Ecology
• National Pollution. Discharge Elimination System (NPDES) Stormwater Permits
• Discharge of process wastewater to surface water
• Underground storage tanks
• Spill prevention and control plans
• Dangerous waste generators
• Groundwater quality protection
• Oil spill prevention and cleanup plans (with U.S. EPA)
Washington State Department of Agriculture
• Pesticide regulations
Puget Sound Clean Air Agency
+ Fugitive dust
• Outside painting
U.S. Coast Guard
• Transfer of petroleum products on Puget Sound
January 2009 King County Stormwater Pollution Prevention Manual
If you have a set of plansiblueprints of your site and the associated storm drainage system,
familiarize yourself and your employees with drainage patterns and drainage structure location.
♦ If you do NOT have a set of plans, prepare a rough sketch that shows the following:
• Drainage structures, i.e., catch basins, pipes, ditches, ponds, vaults, etc.
• Buildings
• Storage structures/sheds
• Storage areas
• Places/points where stormwater leaves your site
♦ Use the attached graph paper for your sketch. A rough sketch will familiarize you with your
on-site drainage system and aid in the implementation of best management practices. If you
have any questions call 206-296-1900.
EXAMPLE
January 2009 King County Stormwater Pollution Prevention Manual
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January 2009 King County Stormwater Pollution Prevention Manual
ALTERNATIVE BEST MANAGEMENT PRACTICES (BMP) REQUEST
THIS FORM is to be used to request the use of an alternative BMP to one or more of the minimum
BMP requirements or for a major modification to one of the required BMPs as stated in the King County
Stormwater Pollution Prevention Manual. It can be used by those who already have BMPs on their site
that may differ from the requirements or in cases where implementation of one or more of the required
BMPs is not the best or preferred solution.
AFTER RECEIVING THIS REQUEST, Stormwater Services staff will: (1) Review the request; (2)
Notify the applicant the request was received and when a decision will be made; and (3) Notify the
applicant in writing of approval or denial, and an explanation of the decision.
INSTRUCTIONS:
1. Answer each question on this form as briefly as possible while still conveying relevant information.
2. Additional pages can be used if necessary.
3. Return this request to:
King County DNRP, Water and Land Resources Division
201 S. Jackson Street, KSC-NR-0600
Seattle, WA 98104-3855
Attn: Stormwater Services Section (Water Quality Compliance)
TO BE COMPLETED BY THE APPLICANT:
Date: Applicant's name:
Facility name (if applicable):
Facility address:
Phone number:
Owner name:
Type of property (brief description):
Specify activity under consideration for BMP:
What the manual requires:
Why this will not work on site or is not as desirable:
OVER
January 2009 King County Stormwater Pollution Prevention Manual
ALTERNATIVE BMP (Page 2)
Describe the alternative BMP:
Explain why this alternative may work:
Constraints or limitations of this alternative BMP (application or seasonal limitation, environmental
constraints):
Other comments:
Please do not write below this line.
TO BE COMPLETED BY COUNTY:
❑ Approved ❑ Approved with Conditions ❑ Denied
Date:
Signature:
Title:
January 2009 King County Stormwater Pollution Prevention Manual
StormwaterRunoff....................................................................................... l
Storm Drains Lead to Lakes and Streams .................................................... l
Polluting is Against the Law........................................................................ l
Ways You May Be Polluting....................................................................... 2
Pollutants..................................................................................................... 2
'IRSTORMWATER RUN-OFF
In vegetated areas such as forests, Fields, and wetlands, rainwater seeps slowly into the
ground. However, when rain falls on paved and other hard surfaces it runs off quickly and is
conveyed by pipes and ditches directly to King County lakes, wetlands, and streams. This
water that flows across the land is called stormwater runoff. Stormwater runoff, although
starting as rain, collects pollutants when it hits the ground and travels. For example, runoff
from parking lots picks up oil and grease dripped from cars, asbestos from worn brake
linings, and zinc from tires. Pesticides, herbicides, and fertilizers are washed off from
landscaped areas, and soils are washed away from construction sites. Any substance found
on the ground can contaminate stormwater runoff.
STORM DRAINS LEAD TO LAKES AND STREAMS
Storm drainage systems are designed to decrease the chance of flooding in areas that have
been developed with homes, businesses, and roads. The rainwater that used to seep into
vegetated areas now must be collected and carried elsewhere. The storm drainage system
collects this stormwater runoff and carries it to the nearest wetland, lake, stream, or to Puget
Sound. In urban areas, the storm drainage system consists of drains and underground pipes.
Storm drains are normally located in streets and parking lots. In rural areas, the storm
drainage system may be in the form of ditches that carry the stormwater along a roadside or
piece of property. These drainage systems are meant to carry only unpolluted stormwater to
the nearest natural body of water. Putting oil, antifreeze, detergents, and other material into
the storm drainage system is the same as dumping them directly into a lake or stream_
The sanitary sewer system is different. Sanitary sewer drains lead to the sanitary sewer
system and end up at a wastewater treatment plant_ This system carries household
wastewater and some permitted industrial wastewater. The wastewater in this system is
treated before being discharged into a natural water body.
POLLUTING IS A GAINST THE LA W j
Keeping pollutants out of the water isn't just a good idea - it's the law. The Washington State
Water Pollution Control Law (RCW 90.48) and the King County Water Quality Code
(KCC 9.12) prohibit the discharge of pollutants to the storm drainage system, surface water,
and groundwater. Polluted stormwater runoff or the direct dumping of pollutants can
negatively affect every water body it enters. Pollution can cause algal blooms causing taste
and odor problems and impaired recreation and aesthetics; toxins can cause lesions and
tumors in fish and other animals; turbidity can cause the destruction of fish spawning areas
and other habitat for plants and animals; and all of this can result in a decrease in fishing,
swimming, and boating opportunities.
January 2009 King County Stormwater Pollution Prevention Manual
Many people know that it is illegal to dump toxic chemicals or other material down a storm
drain. But you are also polluting if you allow pollutants to be washed into a storm drain with
stormwater runoff or with wash water. For instance, you may be polluting if yau:
allow water from washing tools and equipment to enter a storm drain;
♦ spill antifreeze or other material on your site without cleaning it up;
allow materials or wastes stored outside to leak on the ground; or
♦ clear land without taking steps to prevent erosion.
Virtually anything on the ground can become a water pollutant. Therefore, it is important to
keep a clean site and ensure that polluting material is properly handled and stored.
Any substance that can render water harmful to people, fish, or wildlife or impair recreation
or other beneficial uses of water is considered a pollutant. The broad categories of pollutants
and their effects on fish and wildlife are described below.
Table 2.1 (located at the end of this chapter) presents a list of the activities addressed in this
manual. This table indicates the types of pollutants that may be generated by those activities
as well as the types of receiving water bodies that may be affected by stormwater runoff
from the activity sites.
Oils, Greases, and Fuels
Oils and greases are a common component of stormwater runoff pollutants, primarily
because there are so many common sources: driveways, streets and highways, parking lots,
food waste storage areas, heavy equipment and machinery storage areas, and areas where
pesticides have been applied. The familiar sight of a rainbow -colored puddle or trickling
stream of water in parking lots, driveways, and street gutters is a reminder of the presence of
oils and greases in stormwater runoff. Oils and greases can be petroleum-based or food -
related (such as cooking oils). No type of oil or grease belongs in surface water. Oil and
grease are known to be toxic to aquatic organisms at relatively low concentrations. They can
coat fish gills, prevent oxygen from entering the water, and clog drainage facilities (leading
to increased maintenance costs and potential flooding problems).
Metals
Many metals, including lead, copper, zinc and cadmium, are commonly found in urban
runoff. Metals can contaminate surface and groundwater, and concentrate in bottom
sediments, presenting health problems for fish and animals that eat from the bottom of lakes,
streams, and Puget Sound. Reproductive cycles of bottom -dwelling species can be severely
reduced, and fish inhabiting such metal -contaminated locations often exhibit lesions and
tumors. Metals can also contaminate drinking water supplies. Industrial areas, scrap yards,
paints, pesticides, and fallout from automobile emissions are typical sources of metals in
runoff.
January 2009 King County Stormwater Pollution Prevention Manual
Sediments
Sediment, often originating as topsoil, sand, and clay, is the most common pollutant in
stormwater runoff by volume and weight. Sediments readily wash off paved surfaces and
exposed earth during storms. Sediment may seem harmless enough, but it poses serious
problems in the water. Excess sediment concentrations turn stream and lake water cloudy,
making them less suitable for recreation, fish life, and plant growth. Sediment is of
particular concern in fish bearing streams where it can smother trout and salmon eggs,
destroy habitat for insects (a food source for fish), and cover prime spawning areas.
Uncontrolled sediment can also clog storm drains, leading to increased private and public
maintenance costs and flooding problems.
Sediment is also of concern because many other pollutants including oils, metals, bacteria,
and nutrients tend to attach to soil particles. Therefore, when sediments enter water, they
usually carry other pollutants with them.
Cleared construction sites and exposed earth are generally the greatest contributors of soil
particles in surface waters. Other sources include erosion from agricultural lands,
application of sand and salts to icy roads, fallout from pressure washing and sandblasting
operations, dirt from equipment and vehicles, and dirt and grit from parking lots, driveways,
and sidewalks.
Oxygen -Demanding Substances
Plant debris, yard waste, food waste, and some chemical wastes fall into a category of water
pollutants known as oxygen -demanding substances. Such substances use dissolved oxygen
in water when they decay or chemically react. If dissolved oxygen levels in water become
too low, aquatic animals become stressed or die. Salmon and trout are particularly at risk
because they need high dissolved oxygen levels to live.
Animal wastes, food wastes, leaves and twigs, and other miscellaneous organic matter
carried by stormwater runoff into surface water can lead to reduced oxygen levels. Slow-
moving waters are particularly susceptible to oxygen depletion because aeration of the water
by turbulence is lacking. Therefore, oxygen that is depleted in slow-moving waters due to
the presence of excess organic matter or unnatural chemical compounds is not replaced.
Reduced oxygen levels in these waters are often particularly severe after a storm.
Nutrients
Nutrients such as phosphorus and nitrogen are needed by plants to grow, but high levels can
be harmful to water quality. Excess nutrient levels can over -stimulate the growth of algae
and other aquatic plants, resulting in unpleasant odors, unsightly surface scum, and lowered
dissolved oxygen levels from plant decay. Nutrients are most likely to pose a problem in
slow moving water such as lakes or sluggish streams.
Some forces of algae are toxic to fish and other aquatic organisms and may even cause death
in animals that drink affected water. Algae can also cause taste and odor problems in
drinking water, foul-smelling odor in ponds and lakes, and problems with clogged water
intakes, drains, and pipes_ Heavy loading of nutrients into slow-moving waters can
adversely affect many beneficial uses of the water. Forms of nitrogen (ammonium), in
combination with pH and temperature variations, can cause water quality problems and be
toxic to fish. This process consumes large amounts of oxygen in the water and subsequently
stresses or kills fish and other aquatic organisms when oxygen levels are reduced.
January 2009 King County Stormwater Pollution Prevention Manual
Ammonia can harm fish and other aquatic organisms.
Fertilizers, animal wastes, failing septic systems, detergents, road deicing salts, automobile
emissions, eroded soils, and organic matter such as lawn clippings and leaves are all
contributors to excessive nutrient levels in urban/rural and agricultural stormwater runoff.
Toxic Organic Compounds
Toxic organic compounds such as pesticides are particularly dangerous in the aquatic
environment. Excessive application of insecticides, herbicides, fungicides, and rodenticides,
or application of any of these shortly before a storm, can result in toxic pesticide chemicals
being carried from agricultural lands, construction sites, parks, golf courses, and residential
lawns and gardens to receiving waters. Many pesticide compounds are extremely toxic to
aquatic organisms and can cause fish kills.
Many other toxic organic compounds can also affect receiving waters. These toxic
compounds include phenols, glycol ethers, esters, nitrosamines, and other nitrogen
compounds. Common sources of these compounds include wood preservatives, antifreeze,
dry cleaning chemicals, cleansers, and a variety of other chemical products. Like pesticides
these other toxic organic compounds can be lethal to aquatic organisms.
Fecal Coliform Bacteria
Fecal coliform bacteria in water may indicate the presence of pathogenic (disease -causing)
bacteria and viruses. Pet and other animal wastes, failing septic systems, livestock waste in
agricultural areas and on hobby farms, and fertilizers can all contribute fecal coliform
bacteria. This can limit the recreational use of a water body. Bacterial contamination has led
to closures of numerous shellfish harvesting areas and swimming beaches in the Puget
Sound region.
U
The pH value of water is an indication of its relative acidity. The pH value can range from Q
to 14, with a range of 6 to 8 being desirable for most bodies of water. A pH level outside
this range will adversely affect plant and animal life. Waters with very high (basic) or very
low (acidic) pH are corrosive to metal surfaces. There are several sources that can contribute
to change of pH in runoff, including industrial processes that discharge acidic wastewater,
solutions used in metal plating operations, acidic chemicals used in printing and graphic art
businesses, cement used in concrete products and concrete pavement, and chemical cleaners
used in homes and businesses.
January 2009 King County Stounwater Pollution Prevention Manual
c:
}
�
§))]d
BMP Activity Sheets and Worksheet....
OptionalBMPs............................................................................................................... 2
Required BMPs for All Commercial Properties...........................................................
A-1
Storage of Liquid Materials in Stationary Tanks......................................................... A-2
Storage of Liquid Materials in Portable Containers.....................................................
A-3
Storage of Soil, Sand, and Other Erodible Materials ................................................... A-4
Storage of Pesticides and Fertilizers............................................................................
A-5
Storage of Contaminated Soils.....................................................................................
A-6
Storage or Processing of Food Items...........................................................................
A-7
Storage of Solid Waste and Food Waste (Including Cooking Grease) ........................
A -S
Storage of Scrap and Recycling Materials (Including Auto Recycling Facilities) ........
A-9
Treatment, Storage, or Disposal of Dangerous Wastes ...............................................
A-10
Cleaning or Washing of Tools and Equipment...........................................................
A-1 I
Cleaning or Washing of Cooking Equipment.............................................................
A-12
Vehicle Washing and Steam Cleaning........................................................................
A-13
Interior Washing Operations (Including Mobile Contractors) ....................................
A-14
Pressure Washing of Buildings, Rooftops, and Other Large Objects .........................
A-15
Truck or Rail Loading and Unloading of Liquid or Solid Material ...........................
A-16
Fueling Operations .............................
Vehicle and Equipment Repair and Maintenance........................................................
A-1 S
Concrete and Asphalt Production at Stationary Sites ..................................................
A-19
Concrete and Asphalt Application at Temporary Sites ...............................................
A-20
Manufacturing and Post -Processing of Metal Products ..................... ..........................
A-21
Painting, Finishing, and Coating of Vehicles, Products, and Equipment ...................
A-22
Wood Treatment and Preserving.................................................................................
A-23
CommercialComposting.............................................................................................
A-24
Chemical Applications - Other Than Landscaping......................................................A-25
Landscaping Activities and Vegetation Management ................................................. A-26
Clearing and Grading of Land for Small Construction Projects ................................ A-27
Demolition of Buildings.............................................................................................. A-28
Building Repair, Remodeling, and Construction.........................................................
A-29
Boat Building, Maintenance, and Repair....................................................................
A-30
Vehicle and Equipment Parking and Storage..............................................................
A-31
SidewalkMaintenance.................................................................................................A-32
Swimming Pool and Spa Cleaning and Maintenance ..................................................
A-33
Keeping Animals in Controlled Areas ..................................................... ....................
A-34
Keeping Livestock in Stables, Pens, Pastures, or Fields .............................................
A-35
Loggingand Log Yards...............................................................................................
A-36
Mining and Quarrying of Sand, Gravel, and Other Materials .....................................
A-37
Well, Utility, Directional and Geotechnical Drilling, ............................................ - ....
A-38
Roof Vents and Fugitive Emissions............................................................................
A-39
Street Deicing Operations ........................................
Wheel Wash and Tire Bath Operations.......................................................................
A-41
Potable Water Line Flushing or Tank Maintenance ............... 1. .... 1.11.1 ........ ....,........ ....
A-42
Use of Soil Amendments on Construction Sites..........................................................A-43
Dust Control and Soil Erosion and Sediment Control for Manufacturing and
Other Commercial Operations................................................................................ A-44
Maintenance of Public and Private Utility Corridors and Facilities ............................ A-45
BMP ACTIVITY SHEETS
This chapter consists of a series of information sheets listing the best management practices
(BMPs) required for commercial, industrial, agricultural, public, and multifamily residential
activities conducted in unincorporated King County.
The manual limits the requirements to a number of minimal measures that reasonably
balance stormwater pollution reduction with feasibility and cost. The manual also includes
recommended BMPs that should always be considered in the effort to control pollution.
King County's goal is to reduce pollution through education and prevention efforts,
emphasizing source control BMPs before treatment.
Every property in the county has unique characteristics and drainage systems. Some sites
have a constructed storm drainage system with catch basin inlets, while others drain to a
ditch or infiltrate into the ground. The pollution generating activities occurring on site; type
of drainage system; as well as the slope and ground cover of a site will affect the selection
of BMPs. The activity sheets offer flexibility in BMP selection and, as much as possible,
recognize the wide variety of site conditions that may be encountered.
Please note that you are responsible for your own activities as well as those activities and services rendered by a
contractor you hire. Before hiring a contractor, ensure that they follow best management practices and comply with
all federal, state, and local laws.
January 2009 King County Stormwater Pollution Prevention Manual
The BMPs listed below are measures that should be considered at all times for improving
pollution control. These BMPs are NOT REQUIRED, but should be incorporated in your plan of
implementing BMPs. Implementation of some of these BMPs may reduce or eliminate the need
to implement other more complicated or costly BMPs discussed later in the activity sheets.
n
U
Locate Activities as Par as Possible From Surface Drainage Paths
Locating activities on high ground, far from drainage paths, ditches, gutters,
and storm drains allows more time to recognize spills and act to prevent
water contamination.
Avoid the Activity or Reduce its Occurrence
Often an alternate production process or material application process can be
used to substitute for another, more polluting process. Ideally, a polluting
activity can be avoided altogether, or its frequency of occurrence reduced. An
example is washing vehicles less often or taking vehicles to commercial car
washes or detail shops rather than washing on site.
Use Less Material
Improper disposal of excess material or increased application of materials
simply because excess is available can cause pollution. Purchase only the
amount of material that will be needed for foreseeable use. In most cases you
will see cost savings in both purchasing and disposal.
Use the Least Toxic Materials Available
All applications of solid and liquid materials should use the least toxic
products and raw materials available, whether in production; cleaning;
pesticide applications; or other uses. The Seattle -King County Department of
Public Health's Business Waste Line should be consulted for information on
using less toxic products.
January 2009 King County Stormwater Pollution Prevention Manual
11
181
Create and/or Maintain Vegetated Areas Near Activity Locations
Grass and other types of vegetation can filter out many pollutants in
stormwater runoff. Vegetated areas should be maintained around areas where
polluting activities occur, especially down slope of activity areas. Routine
maintenance will keep vegetated areas healthy and capable of filtering
pollutants. (If using installed irrigation systems see King County Code
2IA. 16).
Recycle as Much as Possible
Recycling is always preferable to disposal of unwanted materials. Leftover
paints, finishes, cleaning materials, building materials, etc. may be used by
someone else, so don't throw them away. Contact a neighbor, friend, school,
church, community group, theater group, etc. to see if your leftover materials
can be used. Many empty containers and other common items are recyclable.
Contact the King County Solid Waste Division's Business Recycling
Program and the Seattle -King County Department of Public Health's
Industrial Materials Exchange for recycling at
http://www.goviink.org/bazwasteibusiness/imex/.
Educate Others About Stormwater Pollution Prevention
Educate your employees, business associates, contractors, family, and friends
about stormwater pollution control. Encourage others to find solutions to
stormwater pollution problems, and to continue learning about pollution
control techniques.
Implement Treatment BMPs
Treatment BMPs are used to remove pollutants from stormwater before being
discharged from a site. These include oil water separators and other catch
basin inserts that control pollutants in the piped system and as well as
numerous biological systems such as biofiltration swales, infiltration, and
constructed wetlands. These BMPs may be a preferred option in certain
circumstances. A number of treatment BMPs are described in Chapter V.
January 2009 King County Stormwater Pollution Prevention Manual
Activity
Use this worksheet to identify the activities that you conduct.
Do you conduct this
Sheet
interpret the categories broadly. Numbers A-1 — A-45
activity? If so,
Number
correspond to sheets located in Chapter 3.
where?
TYPE OF ACTIVITY
INDOORS OUTDOORS
�a
A-1
Required BMPs for All Commercial Properties
A-2
Storage of Liquid Materials in Stationary Tanks
A-3
Storage of Any Liquid Materials in Portable Containers
A-4
Storage of Soil, Sand, and Other Erodible Materials
A-5
Storage of Pesticides and Fertilizers
A-6
Storage and Treatment of Contaminated Soils
A-7
Storage and Processing of Food Items
A-8
Storage of Solid Wastes and Food Wastes (Including Cooking
Grease)
A-9
Storage of Scrap and Recycling Materials (Including Auto
Recycling Facilities)
A-10
Treatment, Storage, or Disposal of Dangerous Wastes
:I
A-11
Cleaning or Washing of Tools and Equipment
7
A-12
Cleaning or Washing of Cooking Equipment
A-13
Vehicle Washing and Steam Cleaning
A-14
Interior Washing Operations (Including Mobile Contractors)
A-15
Pressure Washing of Buildings, Rooftops, and Other Large
Objects
A-16
Truck or Rail Loading and Unloading of Liquid Materials
A-17
Fueling Operations
A-18
Engine Repair and Maintenance
A-19
Concrete and Asphalt Production at Stationary Sites
A-20
Concrete and Asphalt at Temporary Sites
A-21
Manufacturing and Post -Processing of Metal Products
January 2009 King County Stormwater Pollution Prevention Manual
Activity Use this worksheet to identify the activities that you conduct. Do you conduct this
Sheet Interpret the categories broadly. Numbers A-1 — A-45 activity? If so,
Number I correspond to sheets located in Chapter 3. where?
TYPE OF ACTIVITY INDOORS OUTDOORS
A-22 Painting, Finishing, and Coating of Vehicles, Products, and
Equipment
A-23 Wood Treatment and Preserving
A-24 Commercial Composting
A-25 I Chemical Applications -Other than for Landscaping
A-26 I Landscaping Activities
A-27 Clearing, Grading, and Preparation of Land for Small
Construction Projects
A-2$ Demolition of Buildings
A-29 Building Repair, Remodeling, and Construction
A-30 Boat Building, Maintenance, and Repair
A-31 j Vehicle and Equipment Parking and Storage
A-32 J Sidewalk Maintenance
A-33 Swimming Pool and Spa Cleaning and Maintenance
A-34 Keeping Animals in Controlled Areas
A-35 Keeping Livestock in Stables, Pens, Pastures or Fields
A-36 Logging and Log Yards
A-37 Mining and Quarrying of Sand, Gravel, and Other Materials
A-38 Well, Directional and Geotechnical Drilling
A-39 Roof Vents and Fugitive Emissions (Including Dust)
A-40 Street Deicing Operations
A-41 Wheel Wash and Tire Bath Operations
A-42 Potable Water Line Flushing or Tank Maintenance
A-43 Use of Soil Amendments on Construction Sites
A -44IDust Control and Soil Erosion and Sediment Control for
Manufacturing and Other Commercial Operations
A45Maintenance of Public and Private Utility Corridors and
I Facilities
King County Stormwater Pollution Prevention Manual January 2009
Required BMPs for All Commercial Properties
The following BMPs are required if you own or occupy commercial,
industrial, agricultural, public, or multifamily residential property
in unincorporated King County.
Clean Your Storm Drainage System
Maintain your storm drainage system by removing sediment and other
debris to prevent the transport of pollutants into receiving waters. The
storm drainage system includes all drains, catch basins, pipes, ditches,
gutters, and flow control and water quality facilities.
f�&_ See BMP Info Sheet 7 in Chapter 5 for details on drainage system
maintenance.
Eliminate Illicit Connections to the Storm Drainage System
A common situation that can cause severe stormwater pollution
problems is discharge of non-stormwater to the storm drainage system.
Examples are discharges from internal floor drains, appliances,
industrial processes, sinks, and toilets_ These are sometimes illegally or
inadvertently connected or drained to the nearby storm drainage system.
These discharges must go to the sanitary sewer system, a holding tank,
an on-site process water treatment system, or a septic system. You must
correct these illicit discharges_ If you have any questions as to whether
your discharge is allowable, contact the King County Water and Land
Resources Division at 206-296-1900.
QbF� See BMP Info Sheet l in Chapter 5 for information on how to
check for illicit connections. You can also ask for help from your
local sewer utility. If you find out that your internal drains are
January 2009 King County Stormwater Pollution Prevention Manua!
Required BMPs for All Commercial Properties (continued)
improperly connected to the storm drainage system, they will need
to be either removed, permanently plugged, or connected to the
sanitary sewer, septic system, on-site treatment system, or a holding
tank.
Stencil Your Storm Drains
Stencil or apply storm drain markers adjacent to storm drains to help
prevent the improper disposal of pollutants. Storm drain inlets should
have messages such as "Dump No Waste - Drains to Stream" applied
next to the catch basin to warn against the intentional dumping or
discharge of pollutants. If the metal catch basin grate has been cast with
this message, marking the drains is still recommended, but may not be
required unless evidence is found that pollutants are being dumped or
washed to the storm drains.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resourees and Parks Water and Land Resources Division at 206-246-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges,
King County Stormwater Pollution Prevention Manual January 2009
Storage of Liquid Materials in Stationary Tanks
This activity applies to you if you store any type of liquids outside, including but not limited to
chemicals, waste oils, solvents, or petroleum products in above ground stationary tanks.
Leaking tanks can contribute toxic compounds, oils and greases, metals, abnormal pH, and
nutrients to stormwater runoff. In addition, spills may occur during liquid transfer operations to
and from the tanks.
This activity does not apply to underground storage tanks or to businesses permitted by the
Washington State Department of Ecology to treat, store, or dispose of dangerous wastes.
Storage of reactive, combustible, or flammable liquids must comply with the King County Fire
Code Title 17.
MINIMUM REQUIREMENTS
The following BMPs, or equivalent measures, methods, or practices
are required if you are engaged in storage of liquid materials in
above ground stationary tanks:
Store and contain liquid materials in such a manner that if the tank is
ruptured or leaks, the contents will not discharge, flow, or be washed
into the storm drainage system, surface waters, or groundwater.
Typically this means installing secondary containment or using a
double -walled tank.
(OF- See BMP Info Sheet 5 in Chapter 5 for information on
containment.
If the liquid is oil, gas, or other material that separates from and floats
on water, install a spill control device (such as an oil/water separator or
down -turned elbow) in the catch basins that collect runoff from the
storage tank area.
CZF= See BMP Info Sheet 9 in Chapter 5 for information on oil/water
separators.
January 2009 King County Stormwater Pollution Prevention Manual
Storage of Liquid Materials in Stationary Tanks (continued)
Required Routine Maintenance:
• Place drip pans or absorbent materials beneath all mounted taps and
at all potential drip and spill locations during filling and unloading
of tanks. Any collected liquids or soiled absorbent materials must be
reused, recycled, or properly disposed of
• Store and maintain appropriate spill cleanup materials near the tank
storage area, in a location known to all. Ensure that employees are
familiar with the site's spill control plan and/or proper spill cleanup
procedures.
• Sweep and clean the storage area as needed if it is paved. Do not
hose down the area to a storm drain.
• Check tanks (and any containment sumps) daily for leaks and spills.
Replace tanks that are leaping, corroded, or otherwise deteriorating.
Collect all spilled liquids and properly dispose of them.
• Inspect spill control devices regularly (daily/weekly) to remove
floating oil and debris.
C:bF- See BMP Info Sheet 2 in Chapter 5 for information on disposal
options.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Storage of Liquid Materials in Portable Containers
This activity applies to you if you store any type of liquids outside including but not limited to
chemicals, waste oils, solvents, or petroleum products in portable containers (such as drums).
This activity covers permanent storage as well as temporary storage areas.. This activity may
also apply to you if you store liquids inside a building and if spills occur, liquid could flow to a
storm drainage system or surface waters. Spills and drips of these liquids, or overtopping of
storage containers, can contribute toxic compounds, oils and greases, metals, abnormal pH, and
nutrients to stormwater runoff.
This activity does not apply to businesses that are permitted by the Washington State Department
of Ecology to treat, store, or dispose of dangerous wastes if all required BMPs are in place as
outlined in the permit. Storage of reactive, combustible, or flammable liquids must comply with
the King County Fire Code.
The following BMPs, or equivalent measures, methods, or practices
are required if you are engaged in the storage of liquid materials in
portable containers:
Place tight -fitting lids on all containers.
Enclose or cover the containers where they are stored. The local fire
district must be consulted for limitations on clearance of roof covers
over containers used to store flammable materials.
Raise the containers off the ground by using a spill containment pallet or
similar method that has provisions for spill control.
OR
Contain the material in such a manner that if the container leaks or
January 2009 King County 5tormwater Pollution Prevention Manua!
Storage of Any Liquid Materials in Portable Containers
spills, the contents will not discharge, flow, or be washed into the storm
drainage system, surface water, or groundwater.
� See BMP Info Sheet 5 in Chapter 5 for information on containment
options.
Place drip pans or absorbent materials beneath all mounted container
taps, and at all potential drip and spill locations during filling and
unloading of containers. Any collected liquids or soiled absorbent
materials must be reused, recycled, or properly disposed of.
'0� See BMP Info Sheet 2 in Chapter 5 for information on disposal
options.
Required Routine Maintenance:
Store and maintain appropriate spill cleanup materials near the
container storage area, in a location known to all. Ensure that
employees are familiar with the site's spill plan and/or proper spill
cleanup procedures.
• Sweep and clean the storage area as needed if it is paved. Do not
hose down the area to the storm drainage system.
Check containers (and any containment sumps) daily for leaks and
spills. Replace containers that are leaking, corroded, or otherwise
deteriorating. If the liquid chemicals are corrosive, containers made
of compatible materials must be used instead of metal drums. New
or secondary containers must be labeled with the product name and
hazards.
• Collect all spilled liquids and properly dispose of them.
• Inspect spill control devices routinely (daily/weekly) and remove
separated floatables.
cZ'- See BMP Info Sheet 2 in Chapter 5 for information on disposal
options.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206 -296 -1900 -
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Storage of Soil, Sand, and Other Erodible Materials
This activity applies to you if you are stockpiling erodible raw materials such as soil, sawdust,
landscaping bark, gravel, sand, and road deicing salts. It covers permanent sites as well as
temporary construction sites and other temporary locations. Raw material stockpiles can easily
erode due to wind or precipitation and contribute suspended solids, nutrients, metals, and
harmful pH to stormwater runoff.
The following BMPs, or equivalent measures, methods, or practices,
are required if you are engaged in storage or stockpiling erodible
material on a routine or temporary basis.
Cover and contain the stockpiles of raw materials to prevent stormwater
from washing material to surface waters or a storm drainage system_
The covers must be in place at all times when the stockpile is not in
active use. Do not hose down the contained stockpile area to the storm
drainage system..
Stockpiles located away from paved areas or where material will not be
washed or tracked to the storm drainage system may not need to be
covered unless windy conditions cause air borne particulate that could
settle on hard surfaces and subsequently washed into adjacent surface
waters or storm drainage systems.
IN
If the stockpiles are so large that they cannot feasibly be covered and
contained, implement erosion control practices at the perimeter and as
needed on site to prevent erosion and runoff of the stockpiled material
into the storm drainage system or off site. See the King County Surface
Water Design Manual, Appendix D {Erosion and Sediment Control
Standards}_
Cz�- See BMP Info Sheet 3 in Chapter 5 for information on covering
options.
January 2009 King County Stormwater Pollution Prevention Manual
Storage of Soil, Sand, and Other Erodible Materials (continued)
[OF, See BMP Info Sheet 5 in Chapter 5 for information on containment
options.
Required Routine maintenance:
• Sweep paved storage areas as needed and collect and dispose of
loose solid materials. Do not hose down the area to a storm drain or
ditch.
• Stock cleanup materials, such as brooms, dustpans, and vacuum
sweepers near the storage area.
The following BMPs are optional unless the above minimum
required BMPs do not provide adequate source control.
A catch basin insert, configured for sediment removal, may remove
some of the pollutants in runoff from this activity. Catch basin inserts
require frequent maintenance to be effective. Carefully consider this
requirement when evaluating your options.
EZ511 See BMP Info Sheet 10 in Chapter 5 for more information.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and land Resources Division at 206-296-1900.
Reader Note. The above requirements are the minimum required BMPs. if these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Storage of Pesticides and Fertilizers
This activity applies to you if you store dry pesticides or fertilizers. See Activity Sheets A-2 and
A-3 for the storage of liquid materials. Runoff from pesticide storage areas can be contaminated
with toxic compounds, oils, and metals. Runoff from fertilizer storage areas can be contaminated
with nutrients and fecal coliform bacteria. The primary problem with most of these pollutants is
that they are soluble, which means they cannot be removed from stormwater runoff, or out of
contaminated water that seeps into the soil, with the technologies currently in use.
MINIMUM REQUIREMENTS
The following BMPs, or equivalent measures, methods, or practices
are required if you are engaged in the storage of dry pesticides and
fertilizers:
Cover pesticides and fertilizers.
See BMP Info Sheet 3 in Chapter 5 for information on covering
options.
Raise the materials off the ground by using pallets or another similar
method to prevent contact with stormwater runoff.
OR
Contain the material in such a manner that if the container leaks or
spills, the contents will not discharge, flow, or be washed into the storm
drainage system, surface waters, or groundwater.
Coll See SMF Info Sheet 5 in Chapter 5 for information on containment
options.
Required Routine Maintenance:
Store and maintain appropriate spill cleanup materials near the
storage area, in a location known to all.
January 2009 King County Stoanwater Pollution Prevention Manual
Storage of Pesticides and Fertilizers (continued)
Clean up any spilled fertilizer or pesticides and ensure that the
materials are kept in the designated covered or contained areas.
• Sweep paved storage areas as needed. Collect and dispose of loose
solid materials. Do not hose down the area to a storm drain or
conveyance ditch.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Storage of Contaminated Soils
This activity applies if you store and treat soils contaminated with toxic organic compounds, oils
and greases, and metals_ Typically this situation arises when other site work is being conducted,
such as removing a leaking underground tank. Contaminated soils are usually excavated and left
on the premises for treatment via aeration and perhaps chemical stabilization. Stormwater runoff
that comes in contact with contaminated soil can carry some of those same contaminants along
with suspended solids into receiving waters. The Washington State Department of Ecology
regulates businesses engaged in this activity. In addition, a permit from the Puget Sound Clean
Air Agency is required if the treatment method for removing soil contaminants involves forcing
air through the soil. The BMPs below supplement other required regulations.
The following BMPs, or equivalent measures, methods, or practices
are required if you are engaged in storage and treatment of
contaminated soils.-
Cover
oils:
Cover or contain contaminated soils to prevent stormwater from
carrying pollutants away to surface or ground waters.
Q�r- See BMP Info Sheet 5 in Chapter 5 for information on containment
and run-on prevention.
Required Routine Maintenance:
• Sweep paved storage areas as needed. Collect and dispose of soil
particles. Do not hose down the area to a storm drain or ditch.
Ca- See BMP Info Sheet 2 in Chapter 5 for information on disposal
options.
• Stock cleanup materials such as brooms, dustpans, and vacuum
sweepers near the storage area.
January 2009 King County Stormwater Pollution Prevention Manual
Storage of Contaminated Soils (continued)
The following BMPs are optional unless the above minimum
required BMPs do not provide adequate source control:
A catch basin insert, configured for sediment removal, may remove
some of the pollutants in runoff from this activity. Catch basin inserts
require frequent maintenance to be effective. Carefully consider this
when evaluating your options.
05'r- See BMP Info Sheet 10 in Chapter 5 for more information.
For more information or assistance in impternenting these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Storage or Processing of Food Items
This activity applies if you temporarily store fruits and vegetables outdoors prior to processing or
other use; crush, cut, or shred fruits or vegetables for wines, frozen juices, and other food and
beverage products; or process meats, seafood and other foods.. Stormwater runoff from areas
where these activities occur may be contaminated with nutrients from crushed or decaying fruits
and vegetables and suspended solids from unwashed produce.
The following BMPs, or equivalent measures, methods, or practices,
are required if you are engaged in the STORAGE of fruits,
vegetables , meats and fish or other food
Minimize use of water to clean fruits and vegetables to avoid excessive
runoff. Animal and fish wastes must be must be sealed or contained in
some manner to ensure they do not leak from dumpsters or other waste
containers. Do not drain water or ice used for storing fish and meat
products to the storm drainage system.
Required Routine Maintenance:
* Clean the storage area as needed to collect dirt and fragments of
fruits or vegetables or other foods_ Properly dispose of collected
waste. Do not hose down the area to the storm drainage system.
+ Stock cleanup materials such as brooms and dustpans near the
storage area.
• Minimize outdoor storage time for fruits and vegetables whenever
possible.
* Collect rotting produce frequently and dispose of it properly.
January 2009 King County Stormwater Pollution Prevention Manual
Storage or Processing of Food Items (continued)
The following BMPs, or equivalent measures, methods, or practices,
are required if you are engaged in the PROCESSING of fruits,
vegetables, meats, fish or other foods:
Enclose the processing area. Any discharges must drain to the sanitary
sewer or a treatment facility.
See BMP Info Sheet 2 in Chapter 5 for information on disposal
options.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. if these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Storage of Solid Waste and Food Wastes (Including Cooking
Grease)
This activity applies to you if you store solid wastes including both food and non-food wastes
outdoors. This typically refers to garbage dumpsters, other outdoor waste containers such as
cooking grease barrels or containers, and any stockpiled garbage. Improper storage of non-food
solid wastes can allow toxic compounds, oils and greases, metals, nutrients, and suspended solids
to enter stormwater runoff. Stormwater runoff from food waste storage areas may be
contaminated with oils and greases, nutrients, and suspended solids if waste containers are
leaking, are not covered, or are too small to contain the amount of waste generated. If you store
dangerous wastes you must follow specific regulations outlined by the Washington State
Department of Ecology.
MINIMUM REQUIREMENTS
The following BMPs, or equivalent measures, methods, or practices,
are required if you are engaged in storage of solid wastes or food
wastes:
Dumpsters and other waste storage containers must be leak -proof with
solid lids. Keep dumpsters closed except when adding waste. If waste
is not in containers, cover all waste piles (plastic tarps are acceptable
coverage) and prevent stormwater run-on and run-off with a berm or
similar method. Keep all waste piles covered except when in use.
CZFI See BMP Info Sheet 5 in Chapter 5 for information on containment
and run-on prevention and BMP Info Sheet 3 for information on
covering options.
When transferring cooking oil/grease to outside containers from
kitchens, cover the container with a tight lid during transport and clean
up any spills immediately. Keep the area around the grease container
clean, free of grease, and debris free.
Use drip pans or absorbent materials whenever grease containers are
emptied by vacuum trucks or other means. Grease cannot be left on the
January 2009 King County Stormwater Pollution Prevention Manual
Storage or Solid Waste and Food Wastes (including Cooking Grease) (continued)
ground. Clean up spills immediately. Collected grease must be properly
disposed of as garbage.
Required Routine Maintenance:
• Check storage containers as needed for leaks and to ensure that lids
are on tightly. Replace containers that are Ieaking, corroded, or
otherwise deteriorating.
• Sweep and clean the storage area as needed if it is paved. Do not
hose down the area to a storm drain.
• Dispose of rinse and wash water from cleaning your containers into
a sanitary sewer according to health department requirements, or if
no sewer is available, store in a holding tank, dead end sump or
truck off site to an approved disposal location.
C21- See BMP Info Sheet 2 in Chapter 5 for information on disposal
options.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Storage of Scrap and Recycling Materials (Including Auto
Recycling Facilities)
This activity applies to you if you salvage and store scrap metal, scrap equipment, junked appliances
and vehicles, empty metal drums, and recyclable items such as cans, bottles, plastic and paper
products for longer than two weeks (unless material is rotated and storage is essentially continuous).
Stormwater runoff from these sites may contain toxic hydrocarbons, polychlorinated biphenyls
(PCBs), other toxic compounds, metals, oils and greases, and suspended solids.
The following BMPs, or equivalent measures, methods, or practices are
required if you are engaged in storage of scrap and recycling
materials:
Designate an area to drain gasoline, engine fluids, and other contaminated
liquids from scrapped items. Dispose and store waste properly, or
preferably recycle it, before the items are placed in the scrap storage area.
Drain and transfer fluids from vehicles and other equipment to storage
containers only in designated areas located on impervious surfaces
(preferably Portland cement concrete) or over drip pans. All containers
used to store fluids must comply with Activity Sheets A-2 and A-3
regarding secondary containment. Storage of gasoline must comply with
the appropriate Fire Codes.
Contain the designated draining and dismantling area to prevent stormwater
from entering the area and carrying pollutants to surface or ground water or
drainage systems_ Dismantling areas trust be covered with roofs and/or
tarps to prevent rainwater contact.
See BMF Info Sheet 5 in Chapter 5 for information on containment and
runon prevention and BMP Info Sheet 3 for information on covering
options.
Check incoming scrap materials, vehicles and equipment for potential fluid
contents and batteries. Always use the designated fluid
draining/dismantling area.
Remove batteries and store batteries in enclosed containers with
neutralizing agents such as baking soda in case of battery breaks and/or
acid leaks.
January 2009 King County Stormwater Pollution Prevention Manual
Storage of Scrap and Recycling Materials (including Auto Recycling Facilities) (continued)
[4]
All scrap metal and materials that may contaminate stormwater runoff must
be covered and raised off the ground to prevent stormwater from contacting
the material. A tarp and a pallet are acceptable. Keep dumpsters used for
scrap closed to keep out rainwater.
Cover or enclose stockpiles of crushed containers, crushed glass, recycled
plastic, and any other material that has the potential to contaminate
stormwater runoff. Stockpiled materials or leachate must not enter the
storm drainage system.
Required Routine Maintenance:
• Inspect the storage area regularly to check for contamination from
stockpiles or containers. Promptly clean up any leaks, spills, or
contamination in the storage area.
• Sweep paved open areas of the scrap storage area as needed. Collect
and properly dispose of loose scrap and other particulates. Do not hose
down the area to a storm drain.
• Store and maintain appropriate spill cleanup materials in a location
known to all. Ensure that employees are familiar with the site's spill
control plan and/or proper spill cleanup procedures.
If you are involved in transporting any of these materials you must (1) carry
spill cleanup material in the vehicle to capture any spilled liquids, or (2)
place an impermeable liner in the bed of your truck to capture any spilled or
leaked materials. Properly dispose of or reuse any collected fluids.
The following BMPs are optional unless the above minimum required
BMPs do not provide adequate source control:
IVA catch basin insert, configured for debris and oil/grease removal, may
remove some of the pollutants in runoff from this activity. Catch basin
inserts require frequent maintenance to be effective. The absorbent
materials for oil and grease removal must be monitored and replaced
regularly to ensure they perform as intended. Carefully consider this when
evaluating your options.
I,- See BMP Info Sheet 10 in Chapter 5 for more information.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Treatment, Storage, or Disposal of Dangerous Wastes
This activity applies to businesses that are permitted by the Washington State Department of
Ecology (WSDOE) to treat, store, or dispose of dangerous wastes. Dangerous waste handling
activities at these businesses can contribute toxic compounds, oils and greases, metals, nutrients,
suspended solids, abnormal pH, and coliform bacteria to stormwater runoff. Detailed BMPs are
not included here because treatment, storage, and disposal (TSD) site requirements are beyond
the level of typical BMP application. WSDOE regulates these facilities with specific
requirements, which include the need for a National Pollutant Discharge Elimination System
(NPDES) permit.
Cz�- Contact the Washington State Department of Ecology at 425-649-7000 or 360 -407 -6000 -
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. if these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
January 2009 King County Storrnwater Pollution Prevention Manual
Cleaning or Washing of Tools and Equipment
This activity applies if you clean all types of tools and equipment. This includes landscaping
equipment such as lawn mowers and weed whackers; tools used at auto and other equipment
repair shops; and, manufacturing equipment such as saws, grinders and screens. Uncontrolled
outdoor washing can contribute toxic hydrocarbons and other organic compounds, oils and
greases, nutrients, metals, harmful pH, and suspended solids to stormwater runoff.
The following BMPs, or equivalent measures, methods, or practices,
are required if you are engaged in cleaning or washing of tools and
small power and manufacturing equipment:
Tool and equipment wash water is considered process water, and must
discharge to the sanitary sewer, a holding tank, or a process treatment
system, regardless of the washing method used.
C:75F, See BMP Info Sheet 2 in Chapter 5 for information on disposal
options-
You
ptions_You are encouraged to recycle your wash water with an enclosed loop
system or use self-contained parts washers. Numerous products are
commercially available that recycle and contain wash water and
cleaning solvents.
If you cannot connect discharges to a sanitary sewer, process treatment
system, or holding tank you must contact the Washington State
Department of Ecology and go through the Individual Wastewater
Discharge permit process.
Lawnmowers may be rinsed with water only on a lawn or similar area as
long as the rinsed -off grass clippings will not be washed to the storm
drain system or surface waters when it rains. Washwater from oily or
similarly contaminated lawn maintenance equipment is not allowed to
flow to or discharge to any stormwater system or surface water.
January 2009 King Courtly Stormwater Pollution Prevention Manual
Gleaning or Washing of Toots and Equipment (continued)
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormw+ater Pollution Prevention Manual January 2009
Cleaning or Washing of Cooking Equipment
This activity applies to you if you clean cooking equipment such as vent filters and grills outside of
buildings. Uncontrolled outdoor washing can contribute oils and greases, nutrients, and suspended solids
to stormwater runoff. Ideally, this type of cleaning activity should take place indoors.
MINIMUM REQUIREMENTS
The following BMPs, or equivalent measures, methods, or practices,
are required if you are engaged in cleaning or washing of cooking
equipment:
Cooking equipment wash water is considered process water, and trust
discharge to the sanitary sewer, a holding tank, or a process treatment
system, regardless of the washing method used.
CZF- See BMP Info Sheet 2 in Chapter 5 for information on disposal
options.
Washing must be done in an inside sink or wash basin. If washing is
done outside, it must be done in a designated area and the wash water
must discharge to one of the above systems. Provisions must be made to
prevent stormwater from becoming contaminated from contact with the
washing area.
C2� See BMP Info Sheet 5 in Chapter 5 for information on containment
and tun -on prevention.
For more information or assistance in implementing, these best management practices, contact the King County Department of
Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. if these BMPs fail to prevent discharges to the storm
drainage system, you will be asked to take additional measures to correct the continued pollution discharges,
January 2009 King County Stormwater Pollution Prevention Manual
Vehicle Washing and Steam Cleaning
This activity applies to you if you wash or steam clean vehicles. It also applies to mobile
operations and commercial car washes. The types of vehicles may include highway maintenance
trucks, taxicabs, buses, rental cars, new and used autos on lots, government and company cars,
construction equipment, fork lifts, golf carts, riding lawn mowers, and similar large vehicles.
Wash water from cleaning activities can contribute toxic hydrocarbons and other organic
compounds, oils and greases, nutrients, metals, and suspended solids to stormwater runoff. The
soap used for washing is often a greater pollution threat than the substances washed off the
vehicles. All soaps are harmful to aquatic organisms, including those labeled as "biodegradable",
"non toxic", or "environmentally friendly".
The following BMPs, or equivalent measures, methods, or practices,
are required if you are engaged in vehicle washing and steam
cleaning:
It is allowable to rinse down the body of a vehicle, including the bed of
a truck, with just water without doing any wash water control BMPs_
The washwater must be screened prior to discharge to the stormwater
drainage system to trap particulates found in wastewater_ Turbid water
may not be discharged directly into the stormwater drainage system.
If you wash with a mild (pH neutral) soap or detergent on an area that
infiltrates water, such as gravel, grass, or loose soil, it is acceptable to let
the wash water infiltrate as long as you only wash the body of vehicles.
However, if your business is located in an area designated as a Critical
Aquifer Recharge Area (CARA), infiltration may sometimes not be
allowed. Check with the Water and Land Resources Division at
206-296-1900 or your local jurisdiction before infiltrating wash water.
If you wash on a paved area and use detergents or other cleansers, or if
you wash/rinse the engine compartment or the underside of vehicles,
you must choose ONE of the following options:
(a) Designate and pave a wash area to wash all vehicles. Discharge
January 2009 King County Stormwater Pollution Prevention Manual
Vehicle Washing and Stearn Cleaning (continued)
wash water from vehicle cleaning operations to a sanitary sewer,
holding tank, or process treatment system, or process it through an
enclosed recycling system.
See BMP Info Sheet 2 in Chapter 5 for information on disposal
options.
The local sewer authority and the King County Wastewater Treatment
Division Industrial Waste Section may have limits on the types and
amounts of pollutants, such as oil and metals that can be discharged to a
sanitary sewer. Absolutely no untreated wash water can enter storm
drains.
(b) Designate and pave a wash area to use when washing all vehicles.
Use a storm drain cover or other effective method to prevent all
wash and rinse water from entering a storm drain or other storm
drainage system component. All runoff from the activity must be
collected for proper disposal to a sanitary sewer. A wet vacuum or
pump can be used for this. There are several products commercially
available that enable collection of runoff. This requirement also
applies to mobile vehicle washing services.
OR
(c) Take the vehicles to a commercial car wash or use a mobile washer
who complies with (a) or (b) above_
Designated wash areas must be well marked with signs indicating where
and how washing must be done.
Oil changes and other engine maintenance cannot be conducted in the
designated washing area.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Interior Washing Operations (Including Mobile Contractors)
This activity applies to you if you are engaged in washing carpets, floors, upholstery, and other
interior items. This activity is performed by both mobile contractors and on-site staff. The typical
washing process includes the use of machines that scrub and suck dirt and other particles with a
wash water solution into a portable containment device with limited capacity. Stormwater and
surface waters or groundwater may become contaminated if collected wash water is disposed
outdoors. Wastewater from washing operations that is dumped into storm drains, on streets, in
drainage ditches, and in other outdoor locations can contaminate water bodies with nutrients,
suspended solids, and chemicals used in the cleaning process.
The following BMPs, or equivalent measures, methods, or practices
are required if you engage in interior washing activities:
Do not dispose of any wastewater from this activity outdoors or to the
storm drainage system. This point must be made clear to employees.
Wastewater from mobile fleet washing operations may be permitted for
sanitary sewer disposal if it does not contain high concentrations of
toxic materials. Contact the local sewer authority and the King County
Wastewater Treatment Division Industrial Waste Section for more
information at 206-263-3000. Wash water can also be recycled.
C01- See BMP Info Sheet 2 in Chapter 5 for information on disposal
options.
Do not dispose of sludges that are left in tanks, containers, or trucks
outdoors or to a ditch or drain connected to the storm drainage system.
Sludges must be disposed of properly.
Q&_ See BMF Info Sheet 2 in Chapter 5 for information on disposal
options.
January 2009 King County Stormwater Pollution Prevention Manua!
Interior Washing Operations (Including Mobile Contractors) (continued)
The following BMPs are optional, unless the above minimum
required BMPs do not provide adequate source control.
Limit the amount of water used in interior washing operations. This
limits the amount of wastewater you need to worry about properly
disposing of.
Recycle wash water.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. if these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Pressure Washing of Buildings, Rooftops, and Other Large
Objects
This activity applies if you are engaged in pressure washing large, immobile objects such as
building facades, rooftops, and awnings on a site -to -site basis. Pressure washing can degrade
water quality as the runoff and loosened solids typically travel directly into the storm drainage
system. Wash water from pressure washing operations can be contaminated with suspended
solids, metals, and possibly other pollutants present on the objects being washed. Pressure
washing of boats in boat yards, marinas, and dry dock areas is covered by a National Pollutant
Discharge Elimination System (NPDES) permit, administered by the Washington State
Department of Ecology, so the BMPs listed below may not apply to pressure washing in these
locations.
The following BMPs, or equivalent measures, methods, or practices
are required if you are engaged in pressure washing of large
objects:
In situations where soaps or detergents are used and the surrounding
area is paved, pressure washers must use a water collection device that
enables collection of wash water and associated solids. A sump pump,
wet vacuum or similarly effective device must be used to collect the
runoff and loose materials. The collected runoff and solids must be
disposed of properly.
CZF- See BMP Info Sheet 2 in Chapter 5 for information on disposal
options.
If soaps or detergents are NOT used, and the surrounding area is paved,
wash water runoff does not have to be collected but must be screened.
Pressure washers must use filter fabric catch basin inserts or some other
type of screening device on the ground and/or in the catch basin to trap
the particles in wash water runoff.
January 2009 King County Stormwater Pollution Prevention Manual
Pressure Washing of Buildings, Rooftops, and Other Large Objects (continued)
►i
If you are pressure washing on a grassed area (with or without soap),
runoff must be dispersed as sheet flow as much as possible, rather than
as a concentrated stream. The wash water runoff must infiltrate into the
I and not drain to the pavement or storm drainage system.
Another option is to hire a mobile washer who collects and recycles
water or complies with the above.
If the painted surface being pressure washed is painted with lead or
other heavy metal -bearing paint (such as chromium or cadmium),
consider using a commercial pressure washing service that can collect,
test, and properly dispose of the wastewater.
The following BMPs are optional, unless the above minimum
required BMPs do not provide adequate source control:
A catch basin insert, configured for debris removal, may remove some
of the pollutants in runoff from this activity. Catch basin inserts require
frequent maintenance to be effective. Carefully consider this when
evaluating your options.
CZF1 See BMP Info Sheet 10 in Chapter 5 for more information.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Truck or Rail Loading and Unloading of Liquid or Solid
Material
This activity applies to the loading and unloading of liquid and solid materials by truck or rail and the
transfer of those materials into tanks, containers or other storage areas. Leaks and spills while
transferring liquid or solid materials can potentially contribute toxic organic compounds, particulates,
oil and grease, nutrients, metals, and harmful pH to stormwater runoff.
The following BMPs, or equivalent measures, methods, or practices,
are required if you are engaged in loading and unloading of liquid or
solid materials:
Use drip pans underneath hose and pipe connections and other leak -prone
spots during liquid transfer operations, and when making and breaking
connections. Several drip pans should be stored in a covered location near
the liquid transfer area so that they are always available, yet protected from
precipitation when not in use. Drip pans can be made specifically for
railroad tracks. Drip pans must be cleaned periodically, and drip -collected
materials must be disposed of properly.
4 See BMP Info Sheet 2 in Chapter 5 for information on disposal options.
Sweep loading/unloading areas as needed to remove debris. Clean up any
material that is spilled during transfer operations immediately. Never wash
spilled material or debris to the storm drains or the street.
To minimize the risk of spills or leaks , ensure employees are trained in and
follow proper loading and unloading procedures.
Store and maintain appropriate spill cleanup materials in a location known
to all. Ensure that employees are familiar with the site's spill control plan
and/or proper spill cleanup procedures.
Check equipment for leaks on a regular basis and repair if needed
January 2009 King County Stormwater Pollution Prevention Manua!
Truck or Rail Loading and Unloading of Liquid or Solid Material (continued)
Conduct loading and unloading operations under cover if possible.
The following BMPs are optional unless the above minimum required
BMPs do not provide adequate source control:
Pave areas where liquids are transferred to and from tanker trucks. Use
Portland cement concrete for fuels such as gasoline that react with asphalt.
Install a curb or dike, or slope the area to prevent stormwater from running
on to the loading/unloading area and washing away spilled material.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 205-295-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Fueling Operations
This activity applies if you refuel vehicles on the premises, whether a large sized gas station or a single
pump maintenance yard installation. It also covers mobile fueling operations. Stormwater runoff from
fueling areas may be contaminated with toxic hydrocarbons, oils and greases, and metals.
The following BMPs, or equivalent measures, methods, or practices, are
required if you are engaged in dedicated permanent fueling operations:
Cover the fueling area with an overhanging roof structure or canopy so that
precipitation cannot come in contact with the fueling area.
See BMP Info Sheet 3 in Chapter 5 for information on covering options.
An exception to this requirement is granted for mobile fueling equipment,
floating fuel islands on water, and oversized vehicles that can not
maneuver under a roof.
Pave the fueling area with Portland cement concrete and contain the area to
prevent uncontaminated stormwater from running into the fueling area and
carrying pollutants to the onsite storm drainage system or adjacent surface
water or conveyance systems.
See BMP Info Sheet 5 in Chapter 5 for information on containment.
Install and maintain an oil or spill control device in the appropriate catch
basin(s) to treat runoff from the fueling area.
See the King County Surface Water Design Manual for various designs
and the BMP Info Sheet 9 in Chapter 5 for further information on
oil/water separators.
Never hose down the fueling area to the storm drains_ Contaminated runoff
must be collected for proper disposal.
Required Routine Maintenance:
• Post signs to remind employees and customers not to top off the fuel
tank when filling. Post signs that ban customers and employees from
changing engine oil or other fluids at that location.
• Store and maintain appropriate spill cleanup materials in a location
known to all. Ensure that employees are familiar with the site's spill
control plan and/or proper spill cleanup procedures.
January 2009 King County Stormwater Pollution Prevention Manual
Fueling Operations (continued)
If you cannot implement the above requirements on your site, consider
ceasing your on-site fueling activities and take your vehicles to a fueling
station that meets these requirements.
The following BMPs, or equivalent measures, methods, or practices, are
required if you are engaged in mobile fueling operations:
Locate the fueling operation to ensure leaks or spills will not discharge,
flow, or be washed into the storm drainage system, surface water, or
groundwater.
Use drip pans or absorbent pads to capture drips or spills during fueling
operations.
If fueling is done during evening hours, lighting must be provided.
Required Routine Maintenance:
Store and maintain appropriate spill cleanup materials in the mobile
fueling vehicle. Ensure that employees are familiar with proper spill
control and cleanup procedures.
The following BMPs are optional unless the above minimum required
BMPs do not provide adequate source control.
Use absorbent pillows or similar absorbent materials in or around storm
drain inlets on the property to filter oily runoff. These require frequent
maintenance and close attention, but can be useful in short-term situations.
Used absorbent materials containing oil must be picked up by a qualified
disposal contractor.
A catch basin insert configured for oil removal may remove some of the
pollutants in runoff from this activity. Catch basin inserts require frequent
maintenance to be effective. Carefully consider this when evaluating your
options. The oil absorbent filter media must retain absorbed oil during future
storm events. See Chapter 6.6.1 of the King County Surface Water Design
Manual for more information regarding which filter media provide
acceptable oil retention.
— See BMP Info Sheet 10 in Chapter 5 for more information.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to the
storm drainage system, you will be asked to take additional measures to correct the continued pollution discharges.
Icing County 5tormwater Pollution Prevention Manual January 2009
Vehicle and Equipment Repair and Maintenance
This activity applies if you repair and maintain vehicles and other equipment. It also applies to
mobile vehicle maintenance operations, such as at construction sites. This common activity can
lead to immediate stormwater contamination if repairs and maintenance are not done in a
controlled manner. This activity can contaminate stormwater runoff with toxic hydrocarbons,
other toxic organic compounds, oil and grease, harmful pH, and metals_
The following BMPs, or equivalent measures, methods, or practices, are
required if you are engaged in engine and vehicle repair and
maintenance:
Inspect vehicles and equipment for leaks. Use drip pans or absorbent material
to capture leaking fluids. Clean up any spilled fluids immediately.
Keep waste oil, antifreeze, and other fluids properly covered and contained.
See Activity Sheet A-3, "Storage of Liquid Materials in Portable Containers."
Store batteries upright in a secure, contained, covered place. Don't store
batteries outside on the ground. Check to ensure batteries are not damaged or
leaking. Keep battery acid neutralizing materials, such as baking soda,
available near the storage area.
Call the Business Waste Line at 246-296-3976 or see http://www_goviink.org/
hazwaste/business/index.cfm for information on the proper disposal and
recycling of vehicle fluids, filters, and batteries.
Sweep paved work areas as needed to clean up debris. Clean up vehicle fluids
with rags or other absorbent material immediately, Never wash paved areas
to a storm drain or the street.
Regular work at a stationary business location should be done indoors. If
temporary work is being conducted outside, use a tarp, ground cloth, or drip
pans beneath the vehicle or equipment to capture all spills and drips. The
collected material must be disposed of, reused, or recycled properly.
See BMP Info Sheet 2 in Chapter 5 for information on disposal options.
January 2009 King County Stormwater Pollution Prevention Manual
Engine Vehicle and Equipment Repair and Maintenance (continued)
Ensure employees are trained in the proper handling, storage, and disposal of
vehicle and equipment fluids.
Store and maintain appropriate spill cleanup materials in a location known to
all. Ensure that employees are familiar with the site's spill control plan and/or
proper spill cleanup procedures. Call the Business Waste Line at 206-296-
3976 for information on the proper disposal of used absorbent materials.
' Industrial laundry services are available that provide reusable cloth shop rags
to clean up small drips and spills. A list of industrial laundry services that
manage shops rags is available online at http://www.goviink.org/hazwaste/
business/wastedirectory/wasteindex.cfm#S. Do not wash cloth rags at home
or at a regular commercial laundry.
The following BMPs are optional unless the above minimum
requirements do not provide adequate source control.
Absorbent material such as pillows or booms can be used around storm drains
or in catch basins to absorb oil and other substances. Used absorbent
materials containing oil or other engine fluids must be disposed of in the
appropriate manner_ Oil recycling vendors or other vendors that pick up used
vehicle fluids can assist in the appropriate disposal of these materials.
A catch basin insert, configured for oil removal, may remove some of the
pollutants in runoff from this activity. Catch basin inserts require frequent
maintenance to be effective. Carefully consider this requirement when
evaluating your options.
See BMP Info Sheet 10 in Chapter 5 for more information.
King County Stormwater Pollution Prevention Manual January 2009
Concrete and Asphalt Production at Stationary Sites
This activity applies if you mix raw materials on-site to produce concrete or asphalt. It also
applies to subsequent activities such as pouring concrete structures, and making other concrete
and asphalt products. Mishandling during concrete production can introduce suspended solids
and metals to stormwater runoff and cause pH alterations in receiving waters. Asphalt production
can introduce toxic hydrocarbons, other toxic organic compounds, oils and greases, and metals to
stormwater runoff. Improper equipment washing may cause concrete and asphalt waste materials
and liquids to be washed to storm drainage systems. Mobile concrete pouring and asphalt
applications are covered under Activity Sheet A-20. This activity sheet does not cover concrete
production at mining or sand and gravel sites covered by a King County Clearing and Grading
Permit or National Pollution Discharge Elimination System (NPDES) Sand and Gravel Permit
issued by the Washington State Department of Ecology. However, if the BMPs conditioned in
these permits do not adequately protect stormwater, surface, or ground water quality, more
stringent BMPs may be required under King County Code 9.12.
The following BMPs, or equivalent measures, methods, or practices,
are required if you are engaged in concrete and asphalt mixing and
production;
Discharge all process water from production, pouring, and equipment
cleaning activities to a sump, process water treatment or recycling
system, or sanitary sewer system. Never wash contaminated water to the
storm drainage system. Discharge to the sanitary sewer system will
require approval from the local sewer district/agency.
CZI- See BMP Info Sheet 2 in Chapter 5 for information on disposal
options.
Contain the production and pouring area to prevent stormwater runon so
pollutants are not washed to stormwater or natural drainage systems.
&_ See BMP Info Sheet 5 in Chapter 5 for information on containment
January 2009 King County Stormwater Pollution Prevention Manual
Concrete and Asphalt Production at Stationary Sites (continued)
and run-on prevention.
Prevent cement dust from settling onto surfaces where it will
contaminate stormwater runoff. Sweep up any settled dust. Never hose
down cement dust to the storm drainage system.
Required Routine Maintenance:
Sweep the production and pouring area as needed if it is paved. Collect
loose chunks of aggregate and raw material particles for recycling or
proper disposal. Do not hose down the area to a storm drain.
The following BMPs are optional unless the above minimum
required BMPs do not provide adequate source control:
Use an oil control device in the catch basins to treat stormwater runoff.
See the King County Surface Water Design Manual and BMP Info
Sheets 9 and 10 in Chapter 5 for further information.
Pave the mixing, production, and/or pouring area(s) with a slope that
drains to a central collection area. For concrete production and pouring
activities, a sump drain should not be provided because it would be
quickly clogged with hardened concrete. It would be effective to
segregate the mixing and pouring area from the curing area because
wastewater from curing applications could be collected by a drain. By
sloping the pavement to a central location, loose chunks of concrete or
asphalt aggregate can be collected more easily and recycled or disposed
of properly.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Concrete and Asphalt Application at Temporary Sites
This activity applies if you apply asphalt and/or pour concrete for building construction, road
construction, sidewalk, curb and gutter repairs and construction, sealing of driveways and roofs,
and other applications. These activities are typically done on a temporary site -to -site basis where
permanent BMP measures do not apply. Asphalt application can contribute high concentrations
of toxic hydrocarbons, other toxic organic compounds, oils and greases, and metals to
stormwater runoff. Concrete pouring can contribute suspended solids and metals to stormwater
runoff and cause detrimental pH changes in receiving waters.
MINIMUM REQUIREMENTS
The following BMPs, or equivalent measures, methods, or practices
are required if you are engaged in concrete pouring and asphalt
application at temporary sites:
Use drip pans, ground cloths, heavy cardboard or plywood wherever
concrete, asphalt, and asphalt emulsion chunks and drips are likely to
fall unintentionally, such as beneath extraction points from mixing
equipment.
Provide storm drain covers, inlet protection or similarly effective
containment devices over all nearby drains at the beginning of the
workday. All accumulations of runoff, aggregate chunks, and other
solids must be collected for proper disposal at the end of the workday
(or more frequently) prior to removing the containment or cover
devices). Drain covers and other containment devices are commercially
available to keep runoff out of the storm drainage system.
Contain and collect the slurry from exposed aggregate washing, where
the top layer of unhardened concrete is hosed or scraped off to leave an
exposed aggregate or rough finish. Never wash or allow the discharge of
concrete slurry to a storm drain, ditch, roadway shoulder or gutter. Use a
storm drain cover, inlet protection or other containment device, such as
a hand -dug sump where slurry can be directed to and contained. (See
item 4 below). All collected runoff must be properly disposed of
January 2009 King County Stormwater Pollution Prevention Manual
Concrete and Asphalt Application at Temporary Sites (continued)
�i
�i
Concrete and concrete pumping vehicles shall not discharge any
concrete, slurry, or rinse water into street gutters, storm drains, or
drainage ditches or onto the paved surface of a roadway or driveway.
Designate a wash-out area onsite where application and mixing
equipment cleaning will be conducted. This washout area can also be
used as an area for rinse water control. It is also acceptable to dispose of
rinse water and slurry in a hole in the ground large enough to contain the
slurry and rinse material. Commercial products and services are also
available for concrete, slurry, and rinse water containment and disposal.
Routine Maintenance:
Sweep the pouring area at the end of each day or more frequently if
needed. Collect loose aggregate chunks and dust. Do not hose down the
area to a storm drain.
The following BMPs are optional, unless the above minimum
required BMPs do not provide adequate source control:
If possible, portable asphalt mixing equipment should be covered by an
awning or other simple structure while raining to avoid contact with
rainfall.
A catch basin insert configured for sediment removal may remove some
of the pollutants in runoff from this activity. This is especially useful if
the activity must proceed on rainy days. Catch basin inserts require
frequent maintenance to be effective, so consider this when evaluating
your options. Concrete work of all types tends to cause elevated pH in
runoff, and it must be monitored and neutralized before off site
discharge of the runoff occurs.
(0— See BMP Info Sheet 10 in Chapter 4 for more information.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Stormwater Services Section at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Manufacturing and Post -Processing of Metal Products
This broad activity group applies to mills, foundries, and fabricators that manufacture and/or
post -process metal products at stationary sites. It does not apply to temporary activities such as
welding or pipe cutting that are conducted in the field. A variety of activities such as machining,
grinding, soldering, cutting, welding, quenching, cooling, and rinsing that may take place are
covered under these BMPs. Wastewater from these operations may be contaminated with toxic
organic compounds, metals, oils and greases, abnormal pH, and suspended solids. Stormwater
runoff from areas where these activities occur can be contaminated with these same pollutants.
Businesses may be required to apply for and obtain a National Pollutant Discharge Elimination
System (NPDES) permit from the Washington State Department of Ecology. Painting, finishing,
and coating of metal products is covered under Activity Sheet A -22 -
The following BMPs, or equivalent measures, methods, or practices
are required if you are engaged in manufacturing or processing
metal products:
Discharge process wastewater from this activity to a sanitary sewer,
holding tank, or process treatment system.
EZF' See BMP Info Sheet 2 in Chapter 5 for information on disposal
options.
Required Routine Maintenance:
• Sweep the work and pouring area at least daily to collect metal
fragments and debris and prevent stormwater contamination. Do not
hose down the area to the storm drainage system.
January 2009 king County Storrnwater Pollution Prevention Manual
Manufacturing and Post -Processing of Metal Products (continued)
The following BMPs are optional unless the above minimum
required BMPs do not provide adequate source control.
Cover the activity area{s} to prevent precipitation from contacting the
area, and to reduce the amount of runoff that has to be detained or
treated.
See BMP Info Sheet 3 in Chapter 5 for information on covering
options.
Use a catch basin insert configured to remove sediment to capture stray
metal particles in runoff. Catch basin inserts require frequent
maintenance to be effective. Carefully consider this when evaluating
your options.
(2� See BMP Info Sheet 10 in Chapter 5 for information on inserts.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County 5tormwater Pollution Prevention Manual January 2009
Painting, Finishing, and Coating of Vehicles, Products, and
Equipment
This activity applies if you apply primers, paints, finishes, and coatings to vehicles, furniture,
manufactured products, and other objects. This includes car detailing work. It also includes
preparation work such as sanding and blasting. BMPs for painting of buildings are given in this
manual under `Building Repair, Remodeling, and Construction." BMPs for painting and
finishing of boats and other marine objects are described under `Boat Building, Maintenance and
Repair." Stormwater runoff from work areas where this activity occurs may be contaminated
with toxic hydrocarbons and other organic compounds, oils and greases, metals, and suspended
solids.
The following BMPs, or equivalent measures, methods, or practices
are required if you are involved in painting, finishing, or coating of
vehicles, products, and equipment:
Enclose all work while using a spray gun or conducting sand blasting
{unless the work is too large} according to the Puget Sound Clean Air
Agency requirements. Approved paint booths must be in place prior to
any vehicle painting. All filters from paint booths must be handled as
required under Dangerous and Hazardous Waste Regulations.
Use ground cloths or other methods to collect dust and debris from
sanding operations. Do not hose down the area to the storm drainage
system.
For outside work, use ground cloths and/or drip pans in locations where
paints, finishes, and other liquid materials are mixed, carried, and
applied.
Required Routine Maintenance:
Store and maintain appropriate spill cleanup materials in a location
known to all. Ensure that employees are familiar with the site's spill
control plan and/or proper spill cleanup procedures.
January 2009 King County Stormwater Pollution Prevention Manual
Painting, Finishing, and Coating of Vehicles, Products, and Equipment (continued)
• Train employees in careful and appropriate application of paints,
finishes, and coatings to reduce misuse and over spray.
• Sweep the area at the end of each day at a minimum. Do not hose
down the area to a storm drain.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Wood Treatment and Preserving
This activity applies if you are involved in wood treatment operations that are performed
outdoors or include storage of freshly treated wood materials outdoors. It includes permanent
sites as well as temporary (or mobile) sites. Some of these operations are unique to large-scale
commercial wood preserving and therefore require a specific set of BMPs. Because materials
used in wood treatment and preserving are extremely toxic, this activity is segregated from
similar activities discussed elsewhere in this manual. Stormwater runoff from wood treatment
and preserving activities may be contaminated with toxic hydrocarbons and other organic
compounds, metals, oils and greases, and suspended solids. Large scale commercial operations
are required to have a stormwater National Pollutant Discharge Elimination System (NPDES)
permit from the Washington State Department of Ecology.
The following BMPs, or equivalent measures, methods, or practices,
are required if you are engaged in wood treatment and preserving.
Use ground cloths or drip pans to collect drips and spills.
Store portable containers of wood preservative compounds indoors or in
a covered location with appropriate secondary containment when not in
use.
C2r See Activity Sheet A-3 "Storage of Liquid Materials in Portable
Containers."
Hold dipped lumber over dip tanks until dripping ceases (if applicable).
Store treated lumber in a covered and paved area for at least 24 hours
following treatment (longer during cold periods) so that precipitation
does not come into contact with the treated products until they are fully
dry. Contain the storage area to restrict stormwater from running into the
covered area.
January 2009 King County Stormwater Pollution Prevention Manual
Wood Treatment and Preserving (continued)
Contain or berm the wood treatment equipment and work areas to
prevent stormwater from entering the area and carrying pollutants away.
Czl� See BMP Info Sheet 5 in Chapter 5 for information on containment
and runon prevention.
Required Routine Maintenance:
• Cover outdoor dip tanks when not in use.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Commercial Composting
This activity applies to you if you are engaged in receiving and composting wastes as a
commercial service. This typically refers to businesses that have numerous compost piles that
require large open areas to break down wastes. Composting can contribute nutrients, coliform
bacteria, and suspended solids to stormwater runoff. When stormwater is allowed to contact any
active composting area, it becomes leachate. Leachate must be separated from stormwater
runoff. All commercial -composting operations must satisfy Seattle -King County Health
Department requirements. In addition, the Department of Ecology requires a National Pollution
Discharge Elimination System (NPDES) permit for commercial composting operations. The
BMPs listed below are intended to complement other regulatory requirements.
The following BMPs, or equivalent measures, methods, or practices
are required if you are engaged in composting wastes:
Ensure that wastes do not contain dangerous materials that belong in a
hazardous waste facility, or solid wastes that do not break down by
composting. Employees must be trained to screen these materials in
incoming wastes.
Locate composting areas on impervious surfaces.
Drain all leachate from composting operations to a sanitary sewer,
holding tank, or on-site treatment system.
(ZF_ See BMP Info Sheet 2 in Chapter 5 for information on disposal
options. Because biochemical oxygen demand (BOD) or fecal
coliform bacteria are significant pollutants in compost runoff,
drainage must be routed to a sanitary sewer or holding tank,
regardless of whether a process treatment system is used.
Contain the compost pile leachate. Containment of leachate will be best
January 2009 King County Stormwater Pollution Prevention Manual
Commercial Composting (continued)
accomplished with a dike or berm, or with intercepting drains placed on
the down slope side of the compost area.
See BMP Info Sheet 5 in Chapter 5 for information on
containment. See the King County Health Code for full
compliance.
Required Routine Maintenance:
Clean up debris from yard areas as needed to prevent stormwater
contamination.
The following BMPs are optional unless the above minimum
required BMPs do not provide adequate source control:
A catch basin insert, configured for debris and sediment removal, may
remove some of the pollutants in runoff from this activity. Catch basin
inserts require frequent maintenance to be effective. Carefully consider
this when considering your options.
Czl� See BMP Info Sheet 10 in Chapter 5 for more information.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Chemical Applications --- Other Than Landscaping
This activity applies if you use pesticides, herbicides or other chemicals for such purposes as
removing moss from rooftops, killing nuisance rodents, and using fungicides to preserve patio
decks. The over application of pesticides in these situations can result in stormwater
contamination in much the same way as in landscaping activities. The pollutants of concern for
stormwater management are toxic organic pesticide compounds, oils, and metals.
Businesses/agencies engaged in this activity must comply with Seattle -King County Department
of Public Health structural pesticide applicator regulations. The BMPs listed below are intended
to complement other regulations. Application of pesticides for landscaping purposes must follow
the BMPs discussed under Activity Sheet A-26, "Landscaping Activities."
The following BMPs, or equivalent measures, methods, or practices,
are required if you apply chemicals for non -landscaping purposes:
Avoid excessive application. Follow manufacturers' application
guidelines and label directions. Chemicals must never be applied outside
if it is raining.
Use the smallest amount of chemicals necessary to accomplish the job.
When applying chenucals on rooftops for moss control or other
chemical treatment, downspouts must either be blocked or disconnected
if the downspouts are directly connected to the storm drainage
conveyance system in the roadway or to a flow control or water quality
facility_ The wash/waste water must be directed to pervious areas such
as landscaping or gravel for infiltration or collected and disposed of to
the sanitary sewer, or taken off site for appropriate disposal. To check if
roof downspouts are connected to street drains, verify if downspouts go
directly into the ground, rather than splash blocks. if the downspouts are
tied directly into the ground, look in the closest catch basin on the
roadway to see if a small (usually a 4 inch PVC) is connected or
discharging into the catch basin which indicates the downspouts directly
discharge to the roadway drainage system.
January 2009 King County Stormwater Pollution Prevention Manua!
Chemical Applications — Other Than For Landscaping (continued)
Clean up any spilled chemicals immediately. Do not hose down to a
storm drain or conveyance ditch.
Do not spray pesticides within 100 feet of open waters, including
wetlands, ponds, and streams, unless approved by local jurisdiction.
Unblock the roof drains or reconnect downspouts when the chemical
application is finished.
The following BMPs are optional unless the above minimum
required BMPs do not provide adequate source control:
Manual pest control strategies such as physically scraping moss from
rooftops, using high-pressure sprayers to remove moss, and using rodent
traps should be attempted.
Integrated pest management (IPM), a comprehensive approach to the
use of pesticides which minimizes pesticide application and stresses
selection of proper products and tailored application rates, is the most
effective BMP measure that can be taken. IPM is applicable to
businesses that frequently apply pesticides.
(&- See BMP Info Sheet 6 in Chapter 5 for information on IPM.
Educate employees about the pollution they can cause if they do not
follow simple rules of application.
Select the least toxic chemical application that can accomplish the job.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County 5tormwater Pollution Prevention Manual January 2009
Landscaping Activities and Vegetation Management
This broad activity encompasses all aspects of landscaping and vegetation management, from small-
scale yard maintenance to large-scale commercial landscaping businesses and vegetation
management programs. It includes vegetation removal, herbicide and insecticide application,
fertilizer application, watering, and other gardening and lawn care practices. Stormwater runoff from
areas that have been subject to pesticide or fertilizer application or extensive clearing, grading or
cutting may be contaminated with pesticides and other toxic organic compounds, metals, oils,
suspended solids, nutrients from fertilizer, and coliform bacteria, and may cause biochemical oxygen
demand.
While not required, consider using the Integrated Pest Management (IPM) approach for pest control.
IPM is an approach that uses an array of methods to manage pest damage with the least possible
hazard to people and the environment. IPM uses a combination of biological, cultural, and physical
practices that can significantly reduce or eliminate the use of pesticides.
See Activity Sheets A-5, "Storage of Pesticides and Fertilizers" and A-3, "Storage of Liquid
Materials in Portable Containers." Landscaping activities related to golf courses should refer to King
County's Golf Course BMP Manual (see Chapter b of this manual for more information).
Note: The term pesticide includes insecticides, herhicides,.fungicides, rodenticides, etc.
The following BMPs, or equivalent measures, methods, or practices
are required if you are engaged in landscaping activities:
Do not apply any pesticides directly to surface waters, unless the
application is approved and permitted by the Washington State Department
of Ecology.
Mix pesticides so that spilled material will not be washed to surface waters,
the storm drainage system, or onto the ground. Clean up any spills
immediately. Ensure employees are trained on the proper use of pesticides
and in pesticide application techniques to prevent pollution_ Washington
pesticide law requires most businesses that commercially apply pesticides
to the property of another to be licensed as a Commercial Applicator.
Follow manufacturers' recommendations and label directions. Pesticides
and fertilizers must never be applied if it is raining or about to rain. Do not
apply pesticides within 100 feet of surface waters such as lakes, ponds,
wetlands, and streams. This also can include stormwater conveyance
ditches_ Remove weeds/vegetation in stormwater ditches by hand or other
January 2009 King County Stonnwater Pollution Prevention Manual
Landscaping Activities and Vegetation Management (continued)
mechanical means. Chemicals should be used as a last resort.
Dispose of grass clippings, leaves, branches, sticks, or other collected
vegetation, by recycling, composting, or burning (if allowed). Do not
dispose of collected vegetation into storm drainage systems, conveyance
ditches, stormwater ponds, or surface water.
Use mulch or other erosion control measures when soils are exposed for
more than one week during the dry season or two days during the rainy
season_
Implement water conservation practices to assure sprinkler systems do not
"overspray" vegetated areas and discharge to hard surfaces such as
sidewalks, driveways, and parking lots. Adjust sprinkler heads accordingly.
Minimize water use so runoff does not occur or enter storm drainage
systems. Use approaches to reduce water use such as those described in the
Natural Yardcare program.
http://your.kingcounty. gov/solidwaste/naturalyardcare/watering.asp
The King County Noxious Weed Control Program provides best
management practices for the removal of typical noxious weeds such as
blackberry and purple loosestrife. Call 206-296-0290 or see
http: //www. kingeounty. gov/environment/animalsandplants/noxious-
weeds/weed-control-practices.aspx for more information.
The following BMPs are optional unless the above minimum required
"MPs do not provide adequate source control:
Integrated pest management (IPM), a comprehensive approach to the use of
pesticides is the most effective BMP measure that can be taken for
herbicide, insecticide, and fungicide use.
See BMP Info Sheet 6 in Chapter 5 for information on TPM.
Fertilizers should be worked into the soil rather than dumped or broadcast
onto the surface. Determine the proper fertilizer application for the types of
soil and vegetation involved. Soil should be tested for the correct fertilizer
usage.
Use mechanical methods of vegetation removal rather than applying
herbicides.
King County Stormwater Pollution Prevention Manual January 2009
Landscaping Activities and Vegetation Management (continued)
An effective measure that can be taken to reduce pesticide use, excessive
watering, and removal of dead vegetation involves careful soil mixing and
layering prior to planting. A topsoil mix or composted organic material
should be rototilled into the soil to create a transition layer that encourages
deeper root systems and drought -resistant plants. This practice can improve
the health of planted vegetation, resulting in better disease resistance and
reduced watering requirements.
Use native plants in landscaping. Native plants do not require extensive
fertilizer or pesticide applications.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and band Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the stoma drainage system, you will be asked to take additional measures to correct the continued pollution
discharges,
January 2009 King County Stormwater Pollution Prevention Manual
Clearing and Grading of Land for Small Construction Projects
This activity applies if you clear, grade or prepare land for projects. Stormwater runoff from
cleared and graded sites can be loaded with suspended sediments and attached pollutants such as
oils and greases, toxic hydrocarbon and herbicide compounds, metals, and nutrients. Control of
this runoff at the source can prevent large pollutant loadings from entering and degrading
receiving waters. Prior to clearing, grading, and preparation activities for construction sites
greater than 2,000 square feet, the King County Department of Development and Environmental
Services (DDES) must be contacted. You may need to follow the procedures for construction site
erosion and sediment control outlined in the King County Surface Water Design Manual,
Appendix D.
King County DDES coordinates the clearing, grading, and erosion control requirements on
individual sites. The King County Surface Water Design Manual has requirements for erosion
and sediment control measures. Appendix D (Erosion and Sediment Control Standards) outlines
requirements that all sites must implement. The King County Surface Water Design Manual
Appendix C (Small Project Drainage Requirements) addresses small project developments. Even
if your site does not require a permit, erosion control measures are still required to prevent turbid
water from entering drainage systems or surface waters. King County uses the authority of
K.C.C. 9.12 and this manual to develop erosion control requirements for those activities not
covered by the King County Surface Water Design Manual.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Stormwater Services Section at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. if these BMPs fail to prevent discharges to
the storm drainage system you will be asked to take additional measures to correct the continued pollution
discharges_
January 2009 King County Stormwater Pollution Prevention Manual
Demolition of Buildings
This activity applies to the removal of existing buildings by controlled explosions, wrecking
balls, or manual methods, and subsequent clearing of the rubble. Demolition of buildings can
introduce a variety of pollutants into stormwater runoff, primarily suspended solids, but also
toxic organic compounds and metals. Broken concrete can elevate the pH of stormwater. This
activity can also produce air borne pollutants that must be controlled to avoid surface water
contamination.
The following BMPs, or equivalent measures, methods, or practices
are required if you are engaged in building demolition:
Spray water throughout the site to help control fine materials and dust.
The amount of water must be actively controlled and monitored to
eliminate contaminated runoff from leaving the site. Other approved
dust suppressants are available. Avoid excessive and repeated
applications of dust suppressant chemicals.
Place filter fabric, inlet control measures or a similarly effective device
in or around all nearby drains to prevent particles and solids from
entering the stone drainage system. Filtering devices shall be placed at
the beginning of the workday and the accumulated materials collected
and disposed of properly before removing the devices at the end of the
workday. Filter fabric and other filter devices are commercially
available.
Sweep surrounding street gutters, sidewalks, driveways, and other paved
surfaces as needed to collect loose debris and garbage. Properly dispose
of collected debris and garbage. Do not hose down the area to a storm
drain.
January 2009 King County Stormwater Pollution Prevention Manual
Demolition of Buildings (continued)
The following BMPs are optional unless the above minimum
required BMPs do not provide adequate source control:
A catch basin insert configured for sediment and debris removal may
remove some of the pollutants in runoff from this activity. Catch basin
inserts require frequent maintenance to be effective. Carefully consider
this when evaluating your options.
<E?� See BMP Info Sheet 10 in Chapter 5 for information.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 246-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Building Repair, Remodeling, and Construction
This activity applies if you are engaged in common on-site Iabor activities associated with
construction of buildings and other structures, remodeling of existing buildings and houses,
painting of building exteriors, and general exterior building repair work. Stormwater runoff from
building repair, remodeling, and construction work can be contaminated with toxic hydrocarbons
in solvents, other toxic organic compounds, suspended solids, metals, abnormal pH, and oils and
greases. Concrete pouring is covered under Activity Sheet A-24,"Concrete and Asphalt
Application at Temporary Sites."
MINIMUM REQUIREMENTSi
The following BMPs, or equivalent measures, methods, or practices
are required if you are engaged in building repair, remodeling, and
construction:
Do not dump any substance, wash water or liquid waste on the
pavement, the ground, or toward a storm drain or drainage ditch.
Use ground or drop cloths underneath outdoor painting, scraping, and
sandblasting work and properly dispose of collected material daily.
Use a ground cloth or oversized tub for activities such as paint mixing
and tool cleaning. Dispose of all wash water from tool cleaning to the
sanitary sewer system. Never dispose of wash water to on-site yard
drains or street drains.
Never dispose of any wash water to a storm drain. Clean paint brushes
and tools covered with water-based paints in sinks connected to
sanitary sewers or in portable containers that can be dumped into a
sanitary sewer. Brushes and tools covered with non -water-based paints,
finishes, or other materials must be cleaned in a manner that enables
collection of used solvents (e.g., paint thinner, turpentine, etc.) for
recycling or proper disposal_
See BMP Info sheet 2 in Chapter 5 for information on disposal
options.
January 2005 King County Stormwater Pollution Prevention Manual
Building Repair, Remodeling, and Construction (continued)
Use a storm drain cover, filter fabric, or similarly effective runoff
control mechanism if dust, grit, wash water, or other pollutants may
escape the work area and enter a catch basin. This is particularly
necessary on rainy days. The containment device(s) must be in place at
the beginning of the workday, and accumulated dirty runoff and solids
must be collected and disposed of in an appropriate manner before
removing the containment device(s) at the end of the workday. For
example, a combination of a wet vacuum and brooms and dustpans
could be used to collect accumulations of dirty runoff. Drain covers,
filter fabric, and other containment devices are commercially available
if effective runoff control cannot otherwise be provided.
If you need to dewater an excavation site, you must filter the water
before discharging to a catch basin or discharging off-site. You should
direct the water through sediment filters or traps or use an equivalent
method. The pH of water from dewatering activities must be
monitored. If the pH is not neutral (7), discharge must not occur to a
drainage system until the water is neutralized through an approved
method. Dewatering must also be assessed for other pollutants that may
not be removed by simple filtering of stormwater. If other pollutants
are present, discharging the water to surface or stormwater systems
may not be allowed. See Appendix D of the King County Surface
Water Design Manual, "Erosion and Sediment Control Standards."
Routine Maintenance.
• Store and maintain appropriate spill cleanup materials in a location
known to all. Ensure that employees are familiar with proper spill
cleanup procedures.
• Sweep paved areas as needed and collect loose particles for proper
disposal. Wipe up spills with rags and other absorbent material
immediately. Do not hose down the area to a storm drain.
• Store toxic material under cover during precipitation events and
when not in use (such as overnight). A cover would include tarps or
other temporary cover materials.
(2r- See Activity Sheet 3, "Storage of Liquid Materials Portable
Containers."
King County Stormwater Pollution Prevention Manual January 2009
Building Repair, Remodeling, and Construction (continued)
The following BMPs are optional unless the above minimum
required BMPs do not provide adequate source control,
Recycle or reuse left over materials.
A catch basin insert configured for debris and sediment removal may
remove some of the pollutants in runoff from this activity. Catch basin
inserts require frequent maintenance to be effective. Carefully consider
this when evaluating your options.
See BMP Info Sheet 10 in Chapter 5 for more information.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
January 2009 King County Stormwater Pollution Prevention Manual
Boat Building, Maintenance, and Repair
This activity group applies to mobile operations, onshore repair facilities, and on -water fueling
and repair operations that are not covered in other activity categories. The variety of practices
grouped into this activity can collectively contaminate stormwater and surface water with toxic
organic compounds, oils and greases, metals, nutrients, suspended solids, and abnormal pH. All
boatyards are required to be covered under a National Pollutant Discharge Elimination System
(NPDES) general or individual permit from the Washington State Department of Ecology. The
BMPs discussed below are similar to those listed in the NPDES Permit and apply to areas not
covered by a NPDES permit.
The following BMPs, or equivalent measures, methods, or practices,
are required if you are engaged in boat building, mooring,
maintenance, and repair; and you are not covered by a NPDES
Permit for Boat Building and Repair Facilities:
Move maintenance and repair activities onshore if possible. This action
reduces some of the potential for direct pollution of water bodies.
Shelter any blasting and spray painting activities by hanging wind
blocking tarps to prevent dust and overspray from escaping.
Use ground cloths or drip pans for collection of drips and spills in
painting, maintenance, repair, and finishing activities.
Collect bilge and ballast water that has an oily sheen on the surface.
Properly dispose of it rattler than dumping it in surface waters or on
land.
C01- See BMP Info Sheet 2 in Chapter 5 for information on disposal
options. Several companies are available for bilge pump -out
services. The problem can possibly be avoided if oil -absorbent
pads are used to capture the oil in the bilge water before pumping.
If pads are used, they must be recycled or properly disposed of.
January 2009 King County Stormwater Pollution Prevention Manual
Boat Building, Maintenance, and Repair (continued)
To avoid spilling directly in surface water bodies, perform paint and
solvent mixing, fuel mixing, and similar handling of liquids on -shore -
Clean up spills immediately. Do not wash spills to a storm drain or
surface waters.
Collect and properly dispose of wash water from washing painted boat
hulls. Consider taking the boat to a local boat yard that is equipped to
collect and treat the wash water. Never dispose of wash water containing
soap or other chemicals to storm drains or surface waters. It is
acceptable to wash a boat using only water.
Required Routine Maintenance:
• Store and maintain appropriate spill cleanup materials in a location
known to all. Ensure that employees are familiar with the site's spill
control plan and/or proper spill cleanup procedures.
• Sweep maintenance yard areas, docks and boat ramps as needed to
collect sandblasting material, paint chips, oils, and other loose
debris. Properly dispose of these collected materials. Do not hose
down the area to the water or to a storm drain.
ADDITIONAL
The following BMPs are optional unless the above minimum
required BMPs do not provide adequate source control:
Boat construction and structural repair activities should be covered.
A tarp should be placed above the water surface underneath the work
area on boats or docks to collect drips, spills, paint chips, and loose
solids when work is performed over water.
All used oil and oil filters should be recycled. Most marinas now offer
used oil recycling services.
No soaps or detergents of any kind should be used to wash the topsides
or hulls of boats where the wash water will enter surface waters.
Use sanders that have dust containment bags.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system. you will be asked to take additional measures to correct the continued pollution
discharges_
!ting County 5tormwater Pollution Prevention Manual January 2009
Vehicle and Equipment Parking and Storage
This activity applies to all types of parking lots (commercial, public, and private), retail store
parking lots, fleet vehicle lots and yards (including rent -a -car lots and car dealerships), industrial
areas, equipment sale and rental lots, and parking lot driveways. Stormwater runoff from these
sites can be contaminated with toxic hydrocarbons and other organic compounds, oils and
greases, metals, nutrients, and suspended solids.
MINIMUM REQUIRED ROUTINE MAINTENANCE
The following BMPs, or equivalent measures, methods, or practices
are required if you have parking lots and driveways:
Sweep parking lots, storage areas, and driveways as needed to collect
dirt, waste, and debris. Do not hose down the area to the storm drainage
system.
If washing/pressure washing of the parking lot occurs, the wash water
must be collected and discharged to a sanitary sewer or other treatment
system. There are services that will clean parking lots and collect water
for off-site disposal. Never drain washwater to the storm drainage
system.
Q�p See BMP Info Sheet 2 in Chapter 5 for information on disposal
options.
Gravel and dirt lots may require additional BMPs to prevent sediment
laden water from leaving your site. Vehicles can track dirt out of
parking and storage areas onto public roadways. Basic sediment
controls as outlined in Appendix D ("Erosion and Sediment Control
Standards") of the King County Surface Water Design Manual must be
installed if other BMPs do not adequately control sediment laden water
from entering off site storm water conveyance systems or surface water.
Wheel wash facilities may need to be considered if track out of mud
becomes a problem. See Activity Sheet A-41, "Wheel Wash and Tire
Bath Operations."
January 2009 King County Stormwater Pollution Prevention Manua!
Vehicle and Equipment Parking and Storage (continued)
ADDITIONAL BMPs
The following BMPs are optional, unless the above minimum
required BMPs do not provide adequate source control.
Encourage employees to carpool or use public transit through
incentives.
Encourage customers to use public transit by rewarding valid transit
pass holders with discounts.
A catch basin insert configured for sediment and also oil removal may
remove some of the pollutants in runoff from this activity. Catch basin
inserts may require frequent maintenance to be effective. Carefully
consider this when evaluating your options.
Clean up oil and antifreeze spills with absorbent materials.
C21- See BMP Info Sheet 10 in Chapter 5 for more information.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs_ If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Sidewalk Maintenance
This activity applies if you have sidewalks. Litter accumulation on sidewalks can contribute
suspended solids to stormwater runoff, runoff from sidewalks crossing driveways may also have
hydrocarbon, oil and grease, and metal contaminants. If herbicides are used on sidewalks, toxic
pesticide compounds, oils, and metals may also be introduced into stormwater. If crack sealants
or surface coatings are applied, toxic hydrocarbons, oils and greases, and metals may be
contributed to stormwater runoff. Sidewalks and driveways are important areas to target for
stormwater pollution control because they typically drain directly to stormwater conveyance
facilities. Note that BMPs for driveways associated with parking lots are described under
Activity Sheet 31, "Vehicle and Equipment Parking and Storage."
The following BMPs, or equivalent measures, methods, or practices
are required if you are engaged in sidewalk maintenance:
Sweep sidewalks as needed to collect loose dirt and debris rather than
pushing it into the street or gutter or hosing it down. Collected materials
must be disposed of as solid waste.
Conduct spot stain removal instead of washing the entire sidewalk. Do
not use soaps and detergents to wash down sidewalks_
If pressure washing of sidewalks is needed, and soaps or other cleaners
are used, the wash water must be collected and disposed of to the
sanitary sewer or taken off site for appropriate disposal. If only water is
used, filtering devices at catch basins must be used to collect all solids
and debris.
January 2009 King County Stormwater Pollution Prevention Manual
Sidewalk Maintenance (continued)
The following BMPs are optional unless the above minimum
required BMPs do not provide adequate source control:
Use deicing salts and sands only when snow or ice is present (not as a
preventive measure) and apply sparingly. Shoveling of snow is always
preferred to dumping excessive amounts of deicing materials in an
effort to avoid shoveling. If deicing salts are used, the residue and
remaining granules must be swept up when the snow and ice have
melted, and reused or disposed of in your garbage.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900,
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Swimming Pool and Spa Cleaning and Maintenance
This activity applies to all municipal swimming pools, commercially owned swimming pools,
and commercially owned spas, including Health Department -regulated facilities (general and
limited use). Pools and spas at hotels, motels, apartment and condominium complexes, and other
private locations, other than single family residences, are also covered here. Older pools and spas
must comply with these provisions as well. Improper drainage of these pools can lead to
nutrients, suspended solids, chlorine, metals, and abnormal pH entering the surface water
environment. Chemicals used in pool and spa maintenance can also contaminate stormwater if
they are not stared properly.
The following BMPs, or equivalent measures, methods, or practices
are required of all businesses, municipalities, and multi -family
residential complexes engaged in swimming pool and spa cleaning
and maintenance:
Dechlorinate pool and spa water to 0.10 ppm or less and adjust to pH
neutral if it is to be discharged to the ground. Neutralizing chemicals are
available for this. Letting the pool or spa "sit" with no neutralizing
chemicals may reduce chlorine levels; the facility should not be used
during this period. Test kits should be used to determine disinfectant
concentrations. The water must not cross property lines, and a
satisfactory means for distributing the water to the ground must be used
so there is no runoff or erosive flows from the water discharge. Pool
water that has been treated with copper based algaecides may not be
discharged to the ground.
Regardless of the sanitizing agent used (chlorine, bromine, or ozone), all
pool and spa drainage must go to a sanitary sewer or water treatment
system if it cannot be dechlorinated sufficiently. If a sanitary sewer is
available, all Health Department -regulated facilities must be connected
to the sanitary sewer for draining and backwash. Prior to draining, the
local sewer authority and the King County Wastewater Treatment
Division Industrial Waste Program may need to be notified, as there are
concerns with the volume of discharge and disinfectant levels. If the
January 2009 King County Stormwater Pollution Prevention Manua!
Swimming Pool and Spa Cleaning and Maintenance (continued)
pool or spa does not have a drain to accommodate this, water will have
to be pumped or drained to a sanitary sewer or water treatment system
inflow pipe connection. If a sanitary sewer is not available, do not
discharge pool or spa water to a septic system, as it may cause the
system to fail. Alternative draining and backwash procedures must be
approved by the Seattle -King County Department of Public Health in
this situation.
Diatomaceous earth (commonly used as a filtering agent in pools)
cannot be discharged to surface waters, storm drainage systems, septic
systems, or on the ground. This material must be disposed of as solid
waste.
Never discharge backwash from filter systems to surface waters or
storm drainage systems.
The following BMPs are optional, unless the above minimum
required BMPs do not provide adequate source control:
Managers of pools and spas located in sensitive areas or adjacent to
shorelines should check with the King County Department of
Development and Environmental Services or the appropriate local
building department to determine if other code requirements apply.
Provide drip pans or buckets beneath drain pipe connections to catch
leaks. This is especially important if the pool or spa water has not been
dechlorinated and is being pumped through piping to an appropriate
discharge location.
Hire a professional pool -draining service to collect all pool water for
off-site disposal.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Stormwater Services Section at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Storrnwater Pollution Prevention Manual January 2009
Keeping Animals in Controlled Areas
This activity applies to outside kennels, fenced pens, and other animal management areas that do
not involve livestock. It includes all types of animal maintenance practices other than keeping
livestock in stables, fields, and pastures. This activity does not cover sheep, pigs, horses, cows,
goats, and other hoofed animals. Stormwater runoff from cage areas, pens, and yards can contain
coliform bacteria, nutrients, and suspended solids. See Activity Sheet A-35 for keeping livestock
in stables, pens, pastures, or fields.
The following BMPs, or equivalent measures, methods, or practices,
are required if you are engaged in management of animals other
than livestock:
If animals are kept in unpaved and uncovered areas, the ground must
either have vegetative cover or some other type of ground cover such as
mulch.
If animals are not leashed or in cages, the area where animals are kept
must be surrounded by a fence or other means that prevents animals
from moving away from the controlled area where BMPs are used.
Do not allow wash water to be discharged to storm drains or surface
waters.
Required Routine Maintenance:
• Sweep and clean animal keeping areas as needed to collect and
dispose of droppings, uneaten food, and other stray particles. Do not
hose down the area to the storm drainage system.
January 2009 King County Storm water Pollution Prevention Manual
Keeping Animals in Controlled Areas (continued)
The following BMPs are optional, unless the above minimum
required BMPs do not provide adequate source control:
Septic systems designed for kennels are commercially available and are
recommended if the above BMPs are not adequate.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note. The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Keeping Livestock in Stables, Pens, Pastures, or Fields
This activity applies to management of all types of livestock, including cows, horses, and other
hoofed animals. Stormwater runoff from areas where livestock are kept may contain coliform
bacteria and nutrients from manure. Suspended solids may be present in runoff from areas that
are eroding due to overgrazing and stream bank trampling. The King County Code 21 A.30 has
specific requirements for livestock management. If livestock management BMPs are
implemented in accordance with the livestock management code, additional BMPs will not be
necessary unless the BMPs are not adequate to protect King County surface waters.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
January 2009 King County Stormwater Pollution Prevention Manual
Logging and Log Yards
This activity covers logging activities that fall under the classification of Class 1V general forest
practices. These are situations where timber harvesting is done in the process of converting forest
lands into other land uses, such as forest cutting for construction of homes. The primary concern
with this logging activity in the context of stormwater pollution is the effect of timber cutting and
understory clearing on erosion processes. Logging activities can introduce large concentrations
of suspended solids and nutrients into stormwater runoff from bare soil and vegetation debris, as
well as toxic organic compounds, oils and greases, and metals from vehicles and pesticides.
The King County Critical Areas Ordinance has requirements for logging near streams, wetlands,
and other sensitive areas, and the King County Surface Water Design Manual has requirements
for the clearing and grading of sites. Additionally, log yard operations are required to apply for
coverage under the State Department of Ecology's National Pollution Discharge Elimination
System (NPDES) baseline general permit. However, if BMPs required in the permit do not
adequately prevent contaminated water discharges, additional BMPs will be required under the
authority of KC Code 9.12 Water Quality.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900,
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
January 2009 King County Stormwater Pollution Prevention Manual
Mining and Quarrying of Sand, Gravel, and Other Materials
This activity applies to surface excavation and on-site storage of sand, gravel, minerals, peat,
clay, rock, and other materials that are mined in unincorporated King County. Mining operations
have the potential to introduce a variety of pollutants into runoff, including nutrients, suspended
solids, abnormal pH, and metals. Precipitation can easily erode cut slope faces and stockpiled
materials, causing stormwater contamination problems.
The Washington State Department of Ecology and the State Department of Natural Resources
regulates all mining activities in the state for the protection of water quality, and is the authority
for enforcement of stormwater requirements related to water quality protection. Ecology has
developed the National Pollutant Discharge Elimination System (NPDES) Sand and Gravel
General Permit for Sand and Gravel Operations, Rock Quarries, and Similar Mining Facilities,
Including Stockpiles of Mined Materials, Concrete Batch Operations, and Hot Mix Asphalt
Operations.
The King County Department of Development and Environmental Services (DDES) also has the
authority to regulate mining activities under the Stormwater Ordinance (KC Code 9.04 and 9.12)
and the Clearing and Grading Ordinance (KC Code 16.82). However, if the DDES permit
conditions do not adequately protect surface and groundwater, additional BMPs will be required
under KC Code 9.12, Water Quality.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
January 2009 King County Stormwater Pollution Prevention Manual
Well, Utility, Directional and Geotechnical Drilling
This activity applies to you if you drill water wells and utilities, environmental protection and
monitoring wells, and geotechnical borings that use machinery in the drilling. It does not apply
to the use of devices such as hand augers. Drilling activities have the potential to impact nearby
surface water resources and underlying groundwater resources due to erosion, sedimentation, and
leaching of contaminants. Stormwater runoff that comes in contact with cuttings and/or spoil
piles can carry suspended solids to receiving waters. If cuttings or spoil piles contain material
removed from a well or boring that was drilled into contaminated subsoils, stormwater can carry
those same contaminants into receiving waters. Similarly, decontamination water and water used
in the drilling operation can readily carry pollutants away from the drilling site if controls are not
used. Ensure that proper permits are obtained for drilling activities, and for clearing and grading
the access routes and the work site. Contact the King County Department of Development and
Environmental Services for information.
The following BMPs, or equivalent measures, methods or practices
are required if you are engaged in mechanical drilling of wells and
geotechnical drilling and directional drilling for utilities:
Determine if environmentally sensitive areas (streams, wetlands, erosion
hazards, and landslide hazards) exist at or within the area of influence of
the work site. For horizontal directional drilling, take measures to ensure
drilling fluids are not inadvertently entering nearby waterbodies or
storm drainage systems.
Develop and implement methods of mitigating potential impacts to
surrounding areas and/or the storm drainage system. The driller must be
equipped to quickly respond to unusual conditions that may arise.
Locate and prepare access roadways such that the amount of excavation
and the potential for erosion is minimized. See the King County Surface
Water Design Manual for information on vehicle access preparation and
maintenance and erosion control measures.
January 2009 King County Stormwater Pollution Prevention Manua!
Well, Utility, and Geotechnical Drilling (continued)
Contain accumulated water and sediment on-site and direct through a
geotextile filtration system (or equivalent system) before discharging to
the surrounding ground surface. Keep all sediment -laden water out of
storm drains and surface waters. If sediment -laden water does escape
from the immediate drilling location, block any nearby catch basins
using fabric, inlet protections, sand bags, erosion fences, or other similar
methods. Similarly, block flow into any nearby stream or wetland, and
renew efforts to retain all sediment at the drilling location.
During wet weather divert any concentrated flows of water into the site
using sandbags or check dams up-slope from the site.
Dispose of soil cuttings and accumulated sediment by appropriate
methods. None of this material can be dumped in or near a wetland,
stream, lake, or Puget Sound. If cuttings or other soils disturbed in the
drilling process are to be temporarily stockpiled on-site, they must be
covered and surrounded by a berm or filter device.
CZF- See the Activity Sheet A-4, "Storage of Soil, Sand, Salt, and Other
Erodible Materials".
Stabilize exposed soils at the end of the job, using mulch or other
erosion control measures.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Roof Vents and Fugitive Emissions
This activity applies if you have a process that vents emissions to the roof and/or if pollutants
accumulate on your roof. Stormwater runoff from roofs of manufacturing and commercial
buildings can be sources of pollutants if building vents and other air emission sources are not
properly treated. Roof surfaces may accumulate hydrocarbons, solvents and other organic
compounds, oils and greases, metals, and other toxins and suspended solids. Operations that are
of special concern include spray -paint booths, paint -stripping operations, electroplating shops,
galvanizing operations, cement kiln dust, and grease from food preparation. BMPs for paint
processes are given in this manual under "Painting, Finishing, and Coating of Vehicles, Products,
and Equipment."
The Puget Sound Clean Air Agency and/or the Washington State Department of Ecology (DOE)
may regulate air pollution control measures. If your activities are regulated by either of these
agencies, these requirements are supplemental. Additionally, if you are covered under a DOE
National Pollution Discharge Elimination System (NPDES) Industrial Permit, and sampling for
specific parameters is required, these BMPs may assist you in attaining your permit conditions.
The DOE has final approval on meeting your NPDES permit requirements_
The following BMPs, or equivalent measures, methods, or practices
are required if you have vents and/or air emissions:
Identify processes that are vented and may contribute pollutants to the
roof. Testing runoff from roof drains may be helpful. Install appropriate
source control measures such as air pollution control equipment (filters,
scrubbers, and other treatment) and operational or process changes.
Maintain air filters and pollution control equipment on a regular basis to
prevent pollutant fallout on your roof. (If you smell odors from outside
the building, the pollution control equipment may need maintenance or
evaluation.)
If proper installation and maintenance of air pollution control equipment
does not prevent pollutant fallout on your roof, additional treatment of
the roof runoff may be necessary. Install/provide appropriate devices for
roof runoff before it is discharged off site. This may include water
quality treatment BMPs such as catch basin filters or structural
stormwater treatment systems.
January 2009 King County 5tormwater Pollution Prevention Manual
Roof Vents and Fugitive Emissions (continued)
(Zl- See BMP Info Sheet 8 in Chapter 5 for information on water
quality treatment BMPs.
Required Routine Maintenance:
If maintenance of the roof requires application of chemicals,
detergents, or other pollutant sources to remove accumulated
emissions, a water collection devise that enables collection of wash
water and associated solids must be used to prevent pollutants
entering the natural and constructed storm drainage system and
waterways. A sump pump, wet vacuum or similarly effective device
must be used to collect the runoff and loose materials. The collected
runoff must be discharged to the sanitary sewer or be removed by a
waste disposal company.
czl� See BMP Info Sheet 2 in Chapter 5 for information on disposal
options.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Street Deicing Operations
This activity applies to you if you perform deicing and/or anti -icing operations on streets and
highways to control ice and snow. Deicers commonly used on highways and streets include
sand, calcium magnesium acetate (CMA), calcium chloride, magnesium chloride, sodium
chloride, urea, and potassium acetate. These deicing and anti -icing compounds become
pollutants when they are conveyed to storm drains or to surface water after application. Leaks
and spills of these chemicals can also occur during handling and storage.
The following BMPs, or equivalent measures, methods, or practices,
are required if you are perform deicing and/or anti -icing operations
on streets and highways:
Select deicers and anti -icing materials that cause the least adverse
environmental impact. Apply only as needed using minimum quantities.
Always adhere to manufacturers and industry standards of use and
application.
Where feasible and practicable use roadway deicers, such as sand,
calcium chloride, magnesium acetate, potassium acetate, or similar
materials, that cause less adverse environmental impact than urea, and
sodium chloride.
Store and transfer de/anti-icing materials on an impervious containment
area in a manner that ensures the material does not enter storm or natural
drainage systems.
Sweep/clean up accumulated de/anti-icing materials and grit from roads
as soon as possible after the road surface clears_
Minimize use in areas where runoff or spray from the roadway
immediately enters sensitive areas such as fish -bearing streams_
January 2009 King County 5tormwater Pollution Prevention Manual
Street Deicing Operations fcontinued)
ADDITIONAL BMPS
The following BMPS are optional unless the above minimum
required BMPS do not provide adequate source control:
Intensify roadway cleaning in early spring to help remove particulates
from road surfaces.
Include limits on toxic metals in the specifications for de/anti-icers.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPS. if these BMPS fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Wheel Wash and Tire Bath Operations
If a site is not paved (e.g. gravel or compacted dirt), sediment and mud on vehicle tires can be
transported onto the adjacent paved roads. If track out cannot be controlled by constructing a
typical rocked construction entrance, a wheel wash system may need to be installed. See
Appendix D, Chapter D.3.4.3 of the King County Surface Water Design Manual for a more
detailed description of wheel wash operation requirements.
MINIMUM REQUIREMENTS
The following BMPs, or equivalent measures, methods, or practices,
are required if are install a wheel wash or tire bath system to
control sediment tracking onto adjacent roads:
The wheel wash area must be paved.
The water level in the wheel wash must be a minimum of 12 inches
deep.
Spray nozzles may be needed in muddy conditions.
Wheel wash systems should be designed with a small grade change, e.g.
6 to 12 inches for a 10 foot wide ponding area, to allow sediment to
collect in the low side of the ponding area to prevent re -suspension of
solids.
Required Routine Maintenance:
• A drain pipe with a 2 to 3 foot riser should be installed on the low
side of the ponding area to allow for cleaning and refilling.
January 2009 King County Storrnwater Pollution Prevention Manual
Wheel Wash and Tire Bath Operations (continued)
The wheel wash should start out with fresh water each day.
Closed loop wheel wash systems are preferred with the wastewater
discharged to a sanitary sewer.
Polymers for flocculation may be used in closed loop systems that
discharge to the sanitary sewer. Contact your local sewer district and/or
the King County Industrial Waste Program for authorization.
Note.- See Appendix D of the Surface Water Design Manual for
additional information or wheel wash systems.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. if these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Potable Water Line Flushing or Tank Maintenance
Line flushing and tank maintenance typically uses chemicals such as chlorine to disinfect
drinking water systems. These chemicals are highly toxic to aquatic organisms. Line flushing
and tank maintenance also creates suspended solids and metals that can degrade receiving
waters.
The following BMPs, or equivalent measures, methods, or practices,
are required if you perform potable water line flushing or tank
maintenance operations:
When flushing water lines or maintaining water tanks, filter water
through sediment traps. If super chlorination or chemical treatment is
used as part of flushing, the water must be discharged to the sanitary
sewer (with applicable permits) or if a sanitary sewer is not available,
the water must be collected and disposed of appropriately. Water cannot
be discharged directly to stormwater systems unless treated and water
quality standards are met. Discharging treated water to stormwater
systems requires approval from the Washington State Department of
Ecology and King County Water and Land Resources (KCWLRD)_ In
some cases, water from line flushing and tank maintenance can be
infiltrated in well -vegetated areas. In order to discharge to the MS4,
water must be dechlorinated to 0.1 ppm and pH adjusted. Water must be
volumetrically and velocity controlled. Contact KCWLRD for approval.
Tank cleaning water must go to the sanitary sewer or be infiltrated into
the ground. No erosive flows can occur and water must not cross
property lines. If tanks are simply drained, infiltration is an acceptable
BMP.
January 2009 King County Stormwater Pollution Prevention Manual
Portable Water Line Flushing or Tank Maintenance (continued)
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Use of Soil Amendments on Construction Sites
The use of soil amendments (including cement treated base (CTB) and cement kiln dust (CKD)) on
development sites must be approved by King County. The approval process is described in BMP Info
Sheet 911, "Processing Requirements for Use of Soil Amendments on Construction Sites".
Note: Additional BMPs may be required to prevent adverse impacts to the public and/or the environment.
It is the responsibility of the permit holder to remain in compliance with all other applicable local, state,
and federal regulations.
Category of Action
Specific Action
CTRICKD Best Management Practices
1. Materials
Solubility
A. If CKD is proposed, a chemical analysis of soluble pollutants of the
Source Analysis
Testing &
product to be used will be provided to the Washington State
Specifications
Department of Ecology (DOE) and the King County Department of
Development and Environmental Services (DDES) in advance of any
product is applied.
B. CTB/CKD mixing percentage is anticipated to be approximately 3
percent to 5 percent.
C. A Geotechnical Engineer will establish the mixing percentage for the
on-site soils.
D. All treatment procedures shall be directed, monitored, and verified by a
Geotechnical Engineer.
E. Soil amendments will never occur in excess of the ability of the on-site
equipment and resources to meet all BMP requirements specified
herein.
2. Site Preparation
Runoff
A. Areas that are to be treated as shown on the plan are flagged off to
Collection
prevent equipment from leaving treated area and going onto untreated
System
areas, and to prevent unauthorized equipment from entering the treated
area.
B. Assessment of surface runoff collection points are noted.
C. Cutoff trenches, collection sumps, and pumps are installed.
D. Sealed storage tanks will be properly sized to contain all runoff from
treated areas.
E. Seated storage tanks shall be set up and ready for use to treat contact
water.
F. An approved wheel wash will be constructed at the construction exit,
typically a paved ramp sump that utilizes high-pressure washers.
G. Copies of Treatment Plan, Approval, and Contingency Plan area are
required to be located on site.
3. Lay -down
A. Exposure of CTB/CKD materials to air to be minimized. Delivery
Mixing
tankers shall be set up to place CTB/CKD directly into spreading
Equipment
trucks or equipment.
B. CTB/CKD operations are only allowed during daylight hours.
C. Tarps or dust bags will be used over the discharge truck hose at
January 2009 King County Stormwater Pollution Prevention Manual
Use of Soil Amendments on Construction Sites (continued)
Category of Action
Specific Action
CTB/CKD Best Management Practices
unloading to prevent dust particles for becoming airborne.
D,
Unloading will occur at the lowest possible pump pressure -
E.
Unloading and mixing will be avoided on high wind days. PSAPCA
Section 9.15 prohibits visible emissions of fugitive dust.
F.
CTB/CKD to be placed on ground by large wheeled spreaders
designed for this purpose capable of measuring application.
G.
When spreading CTB/CKD it shall be kept 2-3 feet away from
untreated areas boundaries to prevent the material from migration and
contaminating outside the treatment zone.
H-
Treatment area will be kept damp/wet at all times CTB/CKD is being
spread and mixed. Skirting around applicator/spreader and mixer is
required to minimize CI'B/CKD dust.
1.
CTB/CKD is to be roto -tilled into soil immediately after being spread
onto soils and shall be done with a skirted tiller.
I
Direct auguring machine that measures, spreads, and mixes CTB/CKD
in one operation is preferred.
K.
Compaction will be complete within 2 hours after CTB/CKD
application.
4. Site Work Progress A.
Dust suppression by use of water trucks shall be used on areas where
Management and Weather
work on dry soil is performed and potential airborne contamination
Conditions
may occur.
B.
The volume of CTB/CKD allowed on site will be limited to the amount
that can be used within a normal workday. Every effort will be made
to forecast the daily delivery rate to match the daily on-site use rate.
C.
CTB/CKD will not be added to soils at a rate that exceeds the ability of
on-site resources to immediately commence mixing and compacting.
D.
No work will occur in rain heavier than drizzle, or under drizzle that
exceeds 6 hours duration, or under any rainfall which generates runoff
from the areas being worked -
E.
Should the weather change to stop the application, remaining
CTB/CKD will be covered and contained to prevent stormwater from
entering storage containment, and causing runoff .
F.
All vehicles and equipment leaving the treatment area/site must be
cleaned/washed to prevent CTB/CKD from leaving site. Wash water
will be contained and treated as needed.
G.
CTB/CKD contact water in the wheel wash will be removed from the
site via a vactor truck for transport to an approved off-site treatment or
disposal facility in accordance with all federal, state, and local laws
and regulations, or, if permitted, to the sanitary sewers stem.
5- Surface Water A-
Surface runoff from the treated areas is to be collected and stored in
Collection
onsite sealed treatment tanks.
B.
A rigid schedule of TESC inspection, maintenance, and drainage
controls will be maintained.
C.
Temporarily plugging and using detention facilities is not allowed as a
storage practice -
D.
Runoff from compacted areas amended with CTB/CKD will be
directed to previously sealed tank(s) until pH levels of water are
verified to be within acceptable background water limits- No
uncontrolled discharge or infiltration from the sealed tank(s) will be
allowed.
E.
Drainage from areas amended with CTB/CKD within the past 72 hours
will be prevented from co -mingling with any other project drainage
A.
C- Discharge A livable
Any and all discharges from this site will be in compliance with all
King County Stormwater Pollution Prevention Manual January 2009
Use of Soil Amendments on Construction Sites (continued)
Category of Action Specific Action
CTB/CKD Best Management Practices
Compliance Regulations
applicable federal, state, and local laws and regulations pertaining to
health and safety, water, air, waste, and wildlife, including the Federal
Clean Water Act, Clean Air Act, and Endangered Species Act.
Laboratory analysis of water is required prior to discharge to verify
compliance.
B.
No infiltration is allowed to occur if pH readings are above 8.5
standard pH units, or below 6.5 standard pH units.
C.
A pH meter must be used to determine levels. pH meter is to be
calibrated following proper QA/QC procedures. Fresh buffers are to
be available to re -calibrate as needed.
D.
A log of turbidity and pH readings will be kept on site for inspection.
E.
All treatment of water must be directed, bench tested, monitored and
verified by a qualified water quality specialist.
F.
Treated area water runoff shall not enter the permanent stormwater
system.
G.
Stormwater drainage system within treatment area is to be cleaned out
prior to use for regular water runoff conveyance from untreated areas.
Water from cleanout is to be tested and treated following the approved
treatment criteria.
7. Natural A.
The preferred method of disposal of the treatment water will be
Treatment and
discharge to the sanitary sewer, provided a permit is obtained to do so.
Discharge B.
If infiltration is proposed, the area of infiltration is to be identified,
capacity confirmed, and a contingency discharge plan in place in the
event facilities fail to infiltrate.
C.
For infiltration, pH limits shall be strictly adhered to.
D.
if a permit to discharge to the sanitary sewer is not obtained, a National
Pollutant Discharge Elimination System (NPDES) discharge permit is
required from DOE. The retention volume of the lined pond(s) will
also be increased to ensure complete control of the retained volume.
Monitoring, bench testing, and controlled discharge rates, with prior
approval by DOE, would be needed prior to discharge to an approved
off-site surface drainage system. Sites that currently have NPDES
permits will need to amend permit prior to discharge to cover this
action. County approval is still required.
E.
Per KCC 9.12, discharges into receiving drainage systems shall not
have acid or basic pH levels.
F.
Scaled storage tanks shall be used to reduce turbidity and pH before
discharge-
ischar e_9.
9.Chemical A.
Carbon dioxide sparging (dry ice pellets) may be used as the chemical
Treatment
treatment agent to reduce the water pH.
B.
Any means of water treatment to reduce pH will require an NPDES
discharge permit from DOE.. Permit would only be granted after bench
testing performed by an independent qualified party.
C.
Active mixing will cease if the residual retention water volume falls
below the ability to treat and properly dispose of contact storm water.
D.
Discharge would only occur after the approval of DOE, following
bench testing and consultation with DOE.
E.
All materials for chemical treatment will be on site and property
stored, during all phases of CTBICKD treatment.
9. Water Quality Monitoring A.
Turbidity and pH will be monitored on a twice-daily basis, prior to
operations and immediately upon ceasing operations, and these
measurements will be recorded. Monitoring will also occur
immediately after any storm event of % inch in 24 hours, or water
January 2009 King County Stormwater Pollution Prevention Manua!
Use of Soil Amendments on Construction Sites (continued)
Category of Action I Specific Action I CTB/CKD Best Management Practices
Kong County Stormwater Pollution Prevention Manual January 2009
migration to the retention pond(s), and the measurements recorded. if
the pH approaches 8.0, monitoring frequency will increase.
B_ Turbidity and pH monitoring will occur in all treatment facilities,
stormwater detention facilities, infiltration areas (if infiltration is used),
and in all surface water areas adjacent to site where stormwater
potentially discharges. Additional upstream surface water sites will be
established to determine background levels of turbidity and pH.
C. All water quality monitoring data will be conducted and evaluated by
an independent, qualified party and conducted using professionally
supportable test protocols and QC procedures.
10. Reporting Ecology and
_QA/
A� All water quality monitoring data will be included in weekly DDES
DDES
TESC reports to DDES, and in weekly NPDES reports to DOE.
B. All work, testing, and monitoring associated with the application of
CTB/CKD shall be observed by engineer. The engineer shall prepare
and submit a report to the assigned DDES project inspector indicating
BMPs were/were not being met.
C. Copies of all reports and logs will be available on site during the soil
and surface runoff treatment activities.
Other elements to
consider:
11. Water Quality — Source Controls
A. There may be very small amounts of concrete washout produced on -
Soils
site as a result of construction of erosion control measures during
reclamation. Concrete washout, if any, would be retained in a lined
enclosure of at least 6 -ml visqueen or plastic sheeting, with no outlet.
The washout retention enclosure would be isolated and separate from
any CTB/CKD area runoff. Contents of the lined concrete washout
enclosure will be removed from the site via a vactor truck for disposal
in an approved off-site treatment or disposal facility in accordance with
all federal, state, and local laws and regulations. Signed trip tickets, as
roof of proper disposal, will be provided to DOE and DDES.
B. Water Quality — Cover Measures
A. Areas amended with CTB/CKD for compaction after CTB/CKD
PH
addition will be covered with plastic or visqueen sheeting, or other
impervious material by the end of each working day.
B. Temporary cover will be maintained over all compacted areas
amended with CTB/CKD until testing confirms that pH levels are
stabilized to background measurements. [Note: Curing to avoid pH
effects has no relationship to the rate at which material can be
compacted in multiple lifts. Compaction will commence immediately
after application and mixing, and multiple lifts will occur as quickly as
each lift is compacted and ready to accept the next.l
C. Should weather conditions prevent mixing, any unmixed CTB/CKD
remaining on site will be enclosed in a sealed containment, such as
Portable silo, or removed from site.
Kong County Stormwater Pollution Prevention Manual January 2009
Dust Control and Soil Erosion and Sediment Control for
Manufacturing and Other Commercial Operations
This activity applies to manufacturing and other commercial operations that generate dust,
sediment, and other particulate matter that may contaminate stormwater runoff if not properly
controlled. Best management practices to control dust and other particulates are intended to stop
dust and other particulates from being tracked or washed to the storm drainage system. If not
controlled, stormwater runoff may be contaminated with suspended solids, toxic organic
compounds, harmful pH, and metals.
The following BMPs, or equivalent measures, methods, or practices,
are required if you are engaged in manufacturing or other
commercial operations:
Sweep paved areas as needed where dust accumulates from commercial,
manufacturing, and industrial operations. Use power vacuum cleaners
and sweepers as appropriate to minimize generating airborne dust and for
more efficient dust removal.
Regularly clean equipment and vehicles subject to dust accumulation
from operations. Never wash down equipment or vehicles to the storm
drainage system.
Stabilize or cover areas of exposed or disturbed soil where necessary to
prevent soil erosion. See the King County Surface Water Design Manual,
Appendix D, Erosion and Sediment Control Standards, for recommended
erosion and sediment control practices and standards.
Ensure employees are trained in the proper operating procedures to
minimize dust from accumulating on the ground.
January 2009 fling County Stormwater Pollution Prevention Manual
Dust Control and Soil Erosion and Sediment Control for Manufacturing and Industrial Operations (continued)
The following BMPs are optional, unless the above minimum
required BMPs do not provide adequate source control.
A catch basin insert, may remove some of the pollutants in runoff from
this activity. Catch basin inserts require frequent maintenance to be
effective. Carefully consider this requirement when evaluating your
options.
CZF1 See BMP Info Sheet 10 in Chapter 5 for more information.
If appropriate, consider using dust filtration and collection systems such
as bag house filters.
Contact your local sewer authority and the King County Wastewater
Treatment Division Industrial Waste Section to determine if it is
acceptable to wash accumulated dust to the sanitary sewer.
Consider using approved dust suppressants such as those listed in the
King County Surface Water Design Manual, Appendix D, Erosion and
Sediment Control Standards. See also the Department of Ecology
Publication "Techniques for Dust Prevention and Suppression," #96-433.
Please note that not all dust suppressants are appropriate for use near
storm drainage systems or surface waters.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Maintenance of Public and Private Utility Corridors and
Facilities
This activity applies to maintenance activities associated with the transmission and distribution
of public and private utilities such as petroleum products, natural gas, water, sewage, and
electrical power. This includes the maintenance of underground utility vaults, pump stations, and
similar facilities. Access roads and equipment maintenance can be sources of pollutants to
stormwater runoff, including suspended solids, oil and grease, petroleum hydrocarbons, harmful
pH, pesticides, and metals.
The following BMPs, or equivalent measures, methods, or practices,
are required if you are engaged in maintaining public and private
utility corridors and facilities:
Minimize the amount of herbicides and other pesticides used to maintain
access roads and facilities. See Activity Sheet A-26, "Landscaping
Activities and Vegetation Management," for BMPs associated with
managing vegetation for access roads and maintenance areas.
Stabilize access roads or areas of bare ground with gravel, crushed rock,
or another method to prevent erosion. Use and manage vegetation to
minimize bare ground/soils that may be susceptible to erosion. See the
King County Surface Water Design Manual, Appendix D, Erosion and
Sediment Control Standards for recommended erosion and sediment
control practices and standards.
Provide stormwater drainage for roads and maintenance areas. Grade
roads with a crown or slope to minimize the potential for erosion from
runof£,Provide ditches, swales, and culverts to convey stormwater
runoff.
Monitor and maintain ditches and culverts as needed to reduce the
possibility of the drainage becoming plugged or blocked, which may lead
to overflows and erosion.
January 2009 King County Stormwater Pollution Prevention Manual
Maintenance of Public and Private Utility Corridors and Facilities (continued)
Check utility vaults or other underground structures for pollutants prior to
pumping out any collected water. If the water is contaminated, it must be
collected for proper disposal. Small amounts of oil may be captured with
absorbent material. Never discharge contaminated water, including high
or low pH, to storm drainage facilities or surface waters.
Clean up any debris or spilled material immediately after completing
maintenance and repair activities.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Introduction............................................... ................................................................1
Residential Automobile and Boat Washing..........................................................R-1
Residential Storage of Solid and Food Wastes....................................................R-2
Residential Automobile Repair and Maintenance................................................R-3
Residential Hazardous Waste Use, Storage, and Disposal
...................................R-4
Residential Gardening and Lawn Care.................................................................R-5
Residential Maintenance and Repairs...................................................................R-6
Residential Swimming Pool and Hot Tub Maintenance ........................
............. ..R-7
This chapter consists of a series of information sheets listing the best management practices
(BMPs) that are required for single family residential activities in unincorporated King
County. The activity sheets in this chapter target typical household activities that have the
potential to pollute stormwater, surface waters, and groundwater.
Stormwater pollution occurs when water runs over the ground, picks up pollutants, and
washes the pollutants into surface and ground waters. Street storm drainage systems are
designed to prevent local flooding by carrying stormwater runoff to nearby streams and
rivers. These drainage systems do not remove pollutants such as motor oil or soap.
Even small amounts of commonly used household products such as motor oil, pesticides,
paint waste, and soaps are harmful to aquatic life. Although individual activities may
appear insignificant, runoff from urban areas is now a leading cause of water pollution in
rivers, lakes, and coastal areas.
King County's goal is to reduce pollution by educating homeowners and residents to
prevent the contamination of stormwater runoff and our streams, rivers, lakes, and
groundwater.
January 2009 King County 5tormwater Pollution Prevention Manual
Residential Automobile and Boat Washing
Automobile washing is one of the most common residential activities that pollutes surface water,
streams, creeks, lakes, and Puget Sound. In addition to soap and dirt, vehicle wash water carries
oil, grease, solvents, nutrients, and metals and to our local water bodies. The soaps and
detergents that we use to wash automobiles can be more of a pollution threat than the grime
washed off the automobiles. Even soaps that are labeled "biodegradable," "environmentally
friendly" or "nontoxic" are harmful to aquatic life and water quality. The "nontoxic" label simply
means the soap is less toxic to the user.
The following BMPs, or equivalent treasures, methods or practices
are required if you engage in automobile or boat washing at your
home.
It is acceptable to rinse down the body of a vehicle/boat with just water
without doing any washwater BMPs. The wash water is diverted from
the storm drain, i.e. wash water will infiltrate.
If you wash your automobile or boat using mild detergents (pH neutral)
on an area that allows for infiltration of the wash water, such as gravel,
grass, or loose soil, it is acceptable to let the wash water infiltrate as
long as you only wash the body of the vehicle (i.e. not the undercarriage
or engine).
If you wash on a paved area such as your driveway and use soaps or
other cleansers, you should do ONE of the following:
Redirect the wash water to vegetated areas such as landscaping or
your lawn. This can be accomplished by using temporary measures
such as a berm, boom/socks, or other solid materials like a piece of
lumber placed at the low point of where your vehicle is parked. This
will direct the flow of water to your lawn or landscaping.
Use a wet vacuum to collect the wash water and then dispose of the
wash water to your sink or toilet for treatment at your local sewage
treatment plant_
January 2009 King County Stormwater Pollution Prevention Manual
Residential Automobile and Boat Washing (continued)
Take your vehicle to a commercial car wash where wash water is
recycled and discharged to the sanitary sewer. This also reduces the
amount of water used for vehicle washing.
Use a hose nozzle with a trigger and shut it off when you're not using it
to conserve water.
Never clean or pressure wash the engine or undercarriage of your
automobile at home. The oil, grease, and other pollutants from this
activity can contaminate your property, as well as groundwater such as
shallow aquifers. This is especially important in areas where wells
provide potable water. For this type of cleaning, take the vehicle to a
commercial car wash where wash water will be treated appropriately.
There are several waterless car wash products on the market. These
products are designed to clean and protect your vehicle without using
water. Cloths, rags, etc. used with these products should be disposed of
as solid waste.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
King County 5tormwater Pollution prevention Manual January 2009
Residential Storage of Solid and Food Wastes
Improper storage of household garbage and other wastes can lead to a variety of pollutants in
storm water runoff. Waste such as leaking garbage cans, yard waste containers without lids,
scrap piles, and junk vehicles and equipment can cause polluted runoff from your property to
drain to surface and groundwater. Contaminants such as oils, greases, nutrients, bacteria,
pathogens, and suspended solids are carried to our creeks, streams, lakes, rivers, and Puget
Sound.
MINIMUM REQUIREMENTS
The following BMPs, or equivalent measures, methods, or practices
are required in storage of solid and food wastes at your home.
Dispose of unwanted garbage or scrap in your regular garbage service
pickup containers, or dispose of garbage and scrap at a landfill or
transfer station. Do not let garbage accumulate at your residence. The
accumulation of garbage is a surface water concern and a health issue.
Accumulated garbage can attract rodents, rats, mosquitoes, and other
pests that are also health hazards.
Waste stored outside should be kept in covered containers or be covered
with a tarp. All waste containers that are outdoors should have lids.
Recycle as much as possible. Someone else may be able to use leftover
paints, finishes, cleaning materials, building materials, etc. Contact a
neighbor, friend, school, church, or community group to see if your left
over materials can be used. The King County Industrial Materials
Exchange (IMEX) is a good resource for finding uses for your left over
materials. Call IMEX at 206-296-4899 or send an e-mail to
imex@kingcounty.gov. Consult the IMEX Web site for more
information, at http://www.govlink.org/hazwaste/business/imex.
Another recycling resource is the King County Online Materials
Exchange at http://yourr_kingcounty.gov/solidwaste/exchange/.
January 2009 IGng County Stormwater Pollution Prevention Manual
Residential Storage of Solid and Food Wastes (continued)
The King County Solid Waste Division provides waste disposal and
recycling information at
http://your.kingeounty.gov/solidwaste/index_asp. Information regarding
proper household hazardous waste disposal is available at
http://www.govlink.org/hazwaste/house, or contact the Hazards Line at
206-246-4692. See Activity Sheet R-4, "Residential Hazardous Waste
Use, Storage, and Disposal."
Compost biodegradable wastes rather than disposing of them as garbage.
Contact the King County Solid Waste Division at
http://your.kingcounty,gov/solidwaste/composting/index.asp for more
information on composting yard and kitchen waste.
Information on yard waste collection services is available at
http: //your. kingcounty.gov/solidwaste/garbage-recycling/yardwaste. asp _
Dispose of pet waste in your garbage; bury it in your yard (not in
vegetable gardens); or, dispose of in sanitary sewer systems such as your
toilet. See
http://your.kingeounty.gov/solidwaste/composting/petwaste.asp.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
King County Stormwater Pollution Prevention Manual January 2009
Residential Automobile Repair and Maintenance
Many people prefer to repair and maintain their vehicles at home. Those that do need to ensure
that these activities do not pollute our streams, rivers, and lakes. Automobile maintenance and
repair activities can introduce chemicals such as oil, grease, antifreeze, hydraulic and brake
fluids, and metals to our surface and groundwater. A recent study estimated that the amount of
oil running off our streets and driveways and ultimately flowing into the oceans is equal to an
Exxon Valdez oil spill — 10.9 million gallons — every eight months (NRC, 2002).
The following best management practices (SMPs) or equivalent
measures, methods, or practices are required if you engage in
automobile repair and maintenance at your home.
Collect all used oil, antifreeze, or other vehicle fluids in containers with
tight fitting lids. Do not mix these fluids in the same container as this
limits your ability to recycle the oil at your local auto parts store or
service station_
Never dispose of used oil, antifreeze, or other fluids into a storm drain,
into a ditch, or onto the ground. oil should be recycled at an auto parts
store or service station. Other fluids can be disposed of at a household
hazardous waste collection site. Call the household hazardous waste line
at 206-296-4692 or see
http://www.govlink.org/hazwaste/house/products/list.cfm for recycling
and disposal information and locations.
Never clean the engine or undercarriage of your vehicle at home. For
this type of cleaning, take the vehicle to a commercial car wash facility.
Use drip pans, tarps, or even cardboard and newspaper under the vehicle
to capture leaks or spills that may occur during maintenance and repair
activities. This ensures spilled fluids won't be washed to the storm
drainage system the next time it rains.
January 2009 King County Stormwater Pollution Prevention Manual
Residential Automobile Repair and Maintenance (continued)
Clean up spills with rags or absorbent material, such as sand, dirt, or cat
litter. Do not wash down or hose down these spills to the curbs,
roadway, or storm drains. Sweep up absorbents and dispose of them in
your garbage can.
Store automotive parts, such as batteries, engines, transmissions, and
other parts that may have oily or greasy residue on them, under cover
and off the ground to minimize rainwater contact. Rainwater can wash
pollutants off these parts and send pollutants to storm drainage systems
and groundwater. Tarps are an inexpensive and easy solution to
covering parts.
• - • - • lip •
Take your vehicle to a commercial car repair facility where fluids are
handled, recycled and disposed of correctly to avoid pollutants being
introduced to our local water bodies. The EnviroS tars Program certifies
businesses for reducing, recycling, and properly managing hazardous
waste. See http://www.envirostars.cor& to search for businesses that
have earned the EnviroStars rating.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
King County 5tormwater Pollution Prevention Manual January 2009
Residential Hazardous Waste Use, Storage, and Disposal
There are a variety of hazardous materials routinely used in and around our homes including
chemical cleaners, pesticides, paints, solvents, lighter fluid, gasoline, antifreeze, brake fluid and
other automotive products, wood preservatives and even batteries from our electronic equipment.
Improper disposal and failure to keep hazardous products from rainwater contact may cause
surface and groundwater pollution. With so many hazardous compounds present in thousands of
households in King County, the cumulative adverse effects of poor usage, storage and disposal
practices are potentially severe to our environmental health.
The following best management practices (BMPs) or equivalent
measures, methods, or practices are required when using or storing
hazardous wastes at your home.
Store all hazardous materials inside a building or shed or under cover.
Do not expose hazardous materials to rainwater that can transport
hazardous pollutants to surface and groundwater.
Use products only as specified on labeling directions.
Dispose of and recycle hazardous wastes through the Household
Hazardous Waste Program or other recycling programs or businesses, or
carefully follow disposal directions on containers of chemicals. There
are three fixed hazardous waste collection sites for household hazardous
waste in Seattle and King County. In addition, the Wastemobile travels
to different areas of King County throughout the year. See
http://www.govlink.org/hazwaste/house or call the Household Hazards
Line at 206-296-4692 for more information.
Never allow hazardous chemicals to be discharged or dumped into storm
drainage systems or on to the ground.
January 2009 King County 5tormwater Pollution Prevention Manual
Residential Hazardous Waste Use, Storage, and Disposal (continued)
Reuse and recycle as much as possible. Someone else may be able to use
leftover paints, finishes, cleaning materials, building materials, etc.
Contact a neighbor, friend, school, church, or community group to see if
your left over materials can be used. The King County Industrial
Materials Exchange (IMEX) is a good resource for finding uses for your
left over materials. Call IMEX at 206-296-4899 or send an e-mail to
imex@kingcounty.gov. Consult the IMEX Web site for more
information, at http://www.goviink.org/hazwaste/business/imex.
Use the least toxic product available. See
http://www.govlink.org/hazwaste/house/alternatives for information on
finding alternatives to hazardous household products.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206 -296 -1900 -
King County 5tormwater Pollution Prevention Manual January 2009
Residential Gardening and Lawn Care
Many pollutants can enter stormwater systems, groundwater, and water bodies as a result of
typical lawn and gardening work. Runoff that is contaminated by pesticides and fertilizers can
severely degrade receiving waters and result in adverse effects on fish and other aquatic life.
Recent studies in the Puget Sound region detected pesticides in urban streams at levels that
exceed limits set to protect aquatic life. Some gardening chemicals are also harmful to children
and pets. Fertilizers add nutrients to water bodies causing unwanted algal blooms and other
aquatic plant growth. Disposal of grass clippings and other vegetation into storm drains,
stormwater ponds, roadside ditches and other water bodies can lead to decreased oxygen levels
in stormwater as the vegetation decomposes. Decreased oxygen levels can be lethal to fish and
other aquatic life. Several simple practices can be used to prevent these problems, and may result
in improved lawn and garden quality. These practices should also be shared with private
landscapers that conduct gardening and lawn care on your property.
Note: The term pesticide includes insecticides, herbicides, fungicides, rodenticides, etc.
The following BMPs, or equivalent measures, methods, or practices,
are required if you are engaged in gardening and lawn care at your
home:
Never apply herbicides, insecticides, rodenticides, or fungicides along
the banks of stream and drainage channels with flowing water, or along
the shores of lakes and wetlands. Never apply these chemicals when it is
raining.
Manually or mechanically remove weeds and other pests rather than
using pesticides in areas of running or standing water.
Store all bags or piles of fertilizers and containers of pesticides in a
covered location such as a garden shed.
Do not sweep or dump grass clippings, leaves, or twigs into any street,
drainage ditch, or stormwater facility or pond.
January 2009 King County Stormwater Pollution Prevention Manual
Residential Gardening and Lawn care (continued)
Store piles of beauty bark and other erodible materials on lawns or other
pervious areas. If these materials are stored on impervious areas such as
driveways, cover them with a tarp so that rainwater does not wash the
materials into storm drains or ditches.
Purchase and use the least amount of pesticides necessary and always
follow the label directions for application. Try pest control measures
that do not require chemicals first. See
http://www.govlink.org/hazwaste/house/yard/problems for information
on how to reduce or avoid the use of pesticides.
Compost your yard wastes, or use yard waste as mulch in your yard or
garden. Contact your local solid waste utility to see if yard waste pickup
service is available. See http://your.kingeounty.gov/solidwaste/garbage-
recycling/yardwaste.asp for more information on yard waste collection
and recycling services.
Educate yourself about alternatives to chemical pesticides and fertilizers
such as integrated pest management techniques. Contact the Local
Hazardous Waste Management Program at 206-296-4692, or visit
http://www.govlink.org/hazwaste/house/yard.
Limit the amount of lawn and garden watering so that surface runoff
does not leave your property. Check automatic sprinkler systems to
ensure water is dispersed to landscaped areas and not to hard surfaces
such as driveways and sidewalks that drain to storm drainage systems.
Avoid planting species on the Noxious Weeds list. For assistance or
questions contact the Noxious Weed Section of WLRD at
206-296-1900.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
Reader Note: The above requirements are the minimum required BMPs. If these BMPs fail to prevent discharges to
the storm drainage system, you will be asked to take additional measures to correct the continued pollution
discharges.
King County Stormwater Pollution Prevention Manual January 2009
Residential Maintenance and Repairs
There are a variety of home maintenance and repair activities routinely carred out by
homeowners in King County that have the potential to adversely affect our streams, rivers, and
lakes. Pollutants generated from these activities can affect whether a lake or water body is
swimmable or fishable. Painting, pressure washing, carpet cleaning, moss control, and concrete
repair and maintenance are a few examples of activities homeowners conduct that can result in
pollutants being discharged to drainage systems, surface water, and ground water. Wash water
from these activities contain chemicals, suspended solids, organic compounds, detergents,
solvents, abnormal pH, and other toxins that have a detrimental and toxic effect on fish and other
aquatic life.
MINIMUM REQUIREMENTS
The following BMPs, or equivalent measures, methods or practices
are required when conducting residential maintenance and repairs at
your home.
Do not dispose of any wastewater into the street, gutter, storm drain, or
drainage ditch, or into a stream, creek, or other body of water.
PAINTING: Do not dispose of wash water from cleaning brushes, paint
rollers, paint buckets, or containers to surface water, storm drains, or
ditches. Wash water from latex paints can be disposed of to the sanitary
sewer. Empty containers of latex paint can be left open to dry out any
residual paint, and then disposed of in your normal garbage or taken to a
transfer station for disposal. Residual oil based paint, paint thinners, and
solvents must be disposed of as hazardous waste.
See hq://www.govlink.org/hazwaste/house/products/list.efm and
http://www.govlinLorg/hazwaste/publications/Paint_ CommonWastes.pdf
for information on the proper disposal of paint and solvent waste.
PRESSURE WASHING: Water from pressure washing decks, driveways
VProofs, or other hard surfaces may contain suspended solids and other
pollutants that should not be directly discharged to drainage systems.
Redirect pressure washing wastewater to vegetated areas or areas such as
gravel, lawns, landscaping, or bare soil where the water will infiltrate
slowly into the ground. If this cannot be accomplished, filter the wash
water through filter fabric, or other filtering media to collect the
suspended solids before discharging the water to a drainage system. If any
January 2009 King County Stormwater Pollution Prevention Manual
Residential Maintenance and Repairs (continued)
chemicals are used during the pressure washing process, the wastewater
must be collected and disposed of in a sanitary sewer system or infiltrated
on site. If moss control or another chemical treatment is used during
pressure washing of roofs, disconnect the downspouts so the chemicals do
not discharge to the storm drainage system, and disperse the wash water
onto adjacent lawns and landscaping.
CARPET CLEANING: Most commercial carpet cleaners have onboard
wastewater recycling systems. If you do your own carpet cleaning, the
wash water must be discharged to the sanitary sewer or your septic
system. Filter the water if it contains lint or other particles to avoid
clogging the drains. If you prefer not to discharge the water to your septic
system, you may also discharge the water to your lawn or a landscaped
area to allow the washwater to infiltrate slowly into the ground. Be aware
that detergents and other cleaning chemicals such as solvents can be
harmful to vegetation and septic systems. Discharging wash water to the
ground may not be allowed if you live in a Critical Aquifer Recharge
Area (CARA). Never dispose of carpet cleaning wash water to a storm
drain, drainage ditch, or surface water. Carpet cleaning wastewater
contains chemicals, detergents, and suspended solids that adversely
impact the quality of surface and ground waters.
CEMENT/CONCRETE WORK: Concrete/cement wash water has a pH
level that is toxic to aquatic life. Do not allow wash water from concrete
work to discharge into storm drainage systems, including small yard
drains or adjacent roadways. This is especially important when installing
washed aggregate driveways or patios. Direct the wash water to vegetated
areas or dig a hole where the wash water can settle and infiltrate slowly
into the ground. The cement residue can be mixed into the soil where the
wash water is infiltrated with no detrimental effects, and the pH will be
neutralized.
rel Mff If ! ! •
Hire a professional home maintenance and repair company that follows
the approved BMPs for home repair and maintenance, as adopted by King
County. If you have questions about which Best Management Practices a
business must comply with contact King County Water and Land
Resources at 206-296-1900 or see
http: //www, kingcounty. go v/environment/waterandiand/storinwater. aspx.
Remember, as a homeowner, you have a responsibility to ensure your
contractors follow the required Best Management Practices. As part of
your agreement with contractors, require them to follow all King County
Codes and regulations.
King County Stormwater Pollution Prevention Manual January 2009
Residential Swimming Pool and Hot Tub Maintenance
Many residents in King County have swimming pools, spas, or hot tubs. Improper drainage or
discharge of pool water to storm drains or ditches during maintenance activities can lead to
nutrients, suspended solids, chlorine, abnormal pH, and other chemicals entering our streams,
rivers, and lakes_ Chemicals used in pool, spa, and hot tub maintenance can contaminate
stormwater and surface water if they are not stored, used, and disposed of correctly.
The following BMPs, or equivalent measures, methods or practices
are required when draining or maintaining your pool, spa, or hot
tub.
Dechlorinate pool, hot tub, and spa water if it is to be discharged to the
ground. Neutralizing chemicals are available. Letting the pool, hot tub,
or spa "sit" with no chemicals may reduce chlorine levels. State law
allows discharges of pool water to the ground if the chlorine level is
below 3 ppm (parts per million). The pool water must be drained to the
ground in a manner so that it does not cross property lines or cause
erosion problems. Never discharge pool water directly to storm drains or
ditches.
If pool or spa water cannot be dechlorinated, the water must be drained
to the sanitary sewer or collected by a pool maintenance company for
off-site disposal.
Diatomaceous earth (commonly used as a filtering agent) and water
from backflushing filter systems cannot be discharged to surface waters,
storm drainage systems, septic systems, or the ground.
Pool water that has been treated with copper based algaecides may not
be discharged to the ground.
January 2009 King County 5tormwaterPollution Prevention Manual
Residential Swimming Pool and Hot Tub Maintenance (continued)
1421rug• • /
Hire a professional pool maintenance company to service your pool, hot
tub or spa.
For more information or assistance in implementing these best management practices, contact the King County
Department of Natural Resources and Parks Water and Land Resources Division at 206-296-1900.
King County Stormwater Pollution Prevention Manual January 2009
BMP Info Sheet I
BMP Info Sheet 2
BMP Info Sheet 3
BMP Info Sheet 4
BMP Info Sheet 5
BMP Info Sheet 6
BMP Info Sheet 7
BMP Info Sheet $
BMP Info Sheet 9
BMP Info Sheet 10
BMP Info Sheet 11
Illicit Connections..............................................................3
DisposalOptions................................................................ 5
Covering Options ......................
Pave Area and Slope to Holding Tank..............................10
Containment and Elevation...............................................12
Integrated Pest Management.............................................14
Drainage System Maintenance ......................................... 15
Water Quality Treatment BMPs....................................... 17
Oil/Water Separator - Treatment BMP ............................. 20
Catch Basin Insert - Treatment BMP................................22
Requirements for Use of Soil Amendments ..................... 25
Best Management Practices Information Sheets
This chapter provides information on how to implement several best management practices
discussed in Chapter III and Chapter IV. It also provides information on some of the currently
available water quality treatment facilities. Stormwater treatment facilities are covered in the
King County Surface Water Design Manual. Existing sites may be able to incorporate treatment
facilities, depending on the site constraints and conditions, without review or approval by the
King County Department of Development and Environmental Services (DDES). Some treatment
BMPs can be installed after review and approval by King County Water and Land Resources
Division Water Quality Compliance Program staff. To obtain approval it may be necessary to
complete the Alternative BMP form located in this manual.
Table 5.1 below lists the BMPs that are discussed in this chapter.
January 2009 King County Stormwater Pollution Prevention Manual
TABLE 5.1
BMP INFO SHEETS
No.
TITLE
1
Illicit Connections
2
Disposal Options
3
Covering Options
4
Pave Area and S12j2e to Holding Tank
5
Containment and Elevation
6
Integrated Pest Management
7
Drainage System Maintenance
8
Water uali Treatment BMPs
9
011/Water Se arator— Treatment BMP
10
Catch Basin Insert - Treatment BMP
11
Processing Requirements for Use of Soil
Amendments on Construction Sites
January 2009 King County Stormwater Pollution Prevention Manual
Source Control BMPs
The following BMP Info Sheets discuss a variety of source control BMPs and other methods
used to prevent, control, and dispose of pollutants. Source control BMPs prevent pollutants from
contaminating stormwater runoff or entering water bodies. Some source control BMPs are
operational, such as reducing the frequency of engaging in a pollution -generating activity,
checking regularly for leaks and drips from equipment and vehicles, and educating employees
about site maintenance and cleanup and spill prevention procedures. Other source control BMPs
use structural methods to prevent rainwater from coming in contact with materials or stored
items that will contaminate stormwater runoff. Examples of these BMPs include a berm or
containment structure to prevent clean stormwater from entering work or storage areas, or a roof
over a storage area. A source control BMP can also include altering or revising your industrial
process to use less potentially contaminating substances_
The goal of King County's Water Quality Compliance program is to reduce the contamination of
water resources by emphasizing source control BMPs. The following BMP Information Sheets
provide more detailed information on how to implement some of these source control BMPs.
January 2009 King County 5torrnwater Pollution Prevention Manua!
Illicit Connections
An illicit connection is a connection that could convey anything not composed entirely of surface
and stormwater directly to the storm drainage system or a water body. Many buildings
throughout King County could have illicit connections to the storm drainage system. These
typically include, but are not limited to, sanitary sewer pipes, process wastewater discharges,
sump overflows, and internal building drains connected to the storm drainage system. As a result
of illicit connections, wastewater containing a variety of pollutants is discharged directly to
storm drains and drainage ditches, and ultimately to receiving waters rather than to the sanitary
sewer system or a septic system. In many instances these connections are unknown to the
business or property owner, and may not show up on building drawings. Elimination of illicit
storm drainage connections is an important facet of stormwater pollution reduction and must be
addressed as a top priority. King County is currently making a committed effort to determine
where illicit connections are present and to require their removal.
All businesses, residents and public agencies in unincorporated King County must investigate
their plumbing/drainage systems to determine if there are any illicit connections to the storm
drainage system, such as internal floor drains plumbed to the storm drainage system. If building
and property drawings are available with plumbing details, they should be reviewed to
understand pipe connections.
If you are unsure whether a particular drain (such as a floor drain) discharges to the storm
drainage system, you should identify where the potential illicit connection drains to by
consulting plans, side sewer cards, and possibly conducting a dye test. Running water from a
hose into the drain and observing where the water discharges is often a very simple and effective
method of identifying illicit connections.
Any pipes or other conveyances connected to storm drainage facilities that drain anything but
stormwater must be permanently plugged or rerouted to a sanitary sewer, holding tank, on-site
process treatment system, or septic system (with approval from the appropriate agencies or
jurisdiction).
If building plans and side sewer cards do not show your plumbing, the most basic methods for
determining a connection is either dye tracing or running water through the system. A nontoxic
dye can be put in water and flushed or drained into the suspect piping. Observations should then
be made in catch basins, manholes, drainage ditches, or other storm drainage conveyances that
January 2009 King County Stofmwater Pollution Prevention Manua!
are present on site (or adjacent to the property) to search for the dye. Enough water must be
poured or flushed through the indoor drain to force the flow to reach the point(s) of observation.
If possible, all other drains in the building should be out of use while the dye test is conducted to
ensure the results can pinpoint the problem drain. This test should be conducted for each suspect
drain on the property. Any observations of dye in the storm drainage system must be noted and
the corresponding indoor drains tagged for followup plugging or rerouting.
If you are uncertain as to the locations of catch basins or manholes that can be used for
observation, or if you can not determine how the storm drainage system is constructed on your
property, contact the King County Water and Land Resources Division (WLRD) at
206-296-1900 for assistance. Notify WLRD at least one day in advance if you are performing a
dye test.
ELIMINATING AN ILLICIT CCNNECTIQN
Drains and pipes that are found to connect to the storm drainage system and have the potential of
discharging pollutants or wastewater must either be permanently plugged or disconnected and
rerouted as soon as possible. Drains that are no longer needed can be plugged with concrete or
another similarly effective material. Whenever process water, stormwater, or other wastewater is
redirected to the sanitary sewer, the local sewer authority and the King County Industrial Waste
Program must be contacted to obtain approval for discharging to the sanitary sewer. The local
sewer authority and King County must also be contacted prior to the installation of any
permanent connection to the sanitary sewer. The name of your local sewer authority is identified
on your water and sewer bill. The local sewer authority and King County Industrial Waste will
regulate the connection both for discharge quantity and quality, but the responsible party will
have to arrange for the necessary plumbing supplies and pipe disconnection/rerouting work.
If a sanitary sewer does not service the property, and one is not available for hookup, alternative
measures are necessary. If the discharge is domestic wastewater from a toilet, sink, appliance, or
shower/bathtub, a septic system can be used to receive the rerouted discharge. The connection of
plumbing fixtures to an on-site sewage disposal system usually requires an on-site sewage
disposal system repair permit. Therefore, before any pipes are rerouted, the Seattle -King County
Department of Public Health must be contacted for further information. If a septic system is not
present on the property then one should be installed. The Seattle -King County Department of
Public Health should be contacted for advice and information on septic system requirements. If
the discharge is industrial process water or other nondomestic wastewater, a holding tank or on-
site treatment system will be needed. If an illicit connection needs to be rerouted to a holding
tank, King County Water and Land Resources Division staff should be contacted for assistance
and information on tank content disposal requirements. As with septic system and sanitary sewer
hookups, the property owner or responsible business operator is responsible for rerouting the
Illicit pipe connections.
January 2009 King County Stormwater Pollution Prevention Manual
Disposal Options
Every business, property owner, and public agency in King County must dispose of solid and
liquid wastes and contaminated stormwater properly. There are generally five options for
disposal depending on the types and quantity of materials. These options are: (1) sanitary sewer
system, (2) septic system, (3) recycling, (4) municipal solid waste disposal facilities, and
(5) waste transportation and disposal services. Ordinary stormwater runoff is not considered to
be contaminated to the point of requiring special disposal. Stormwater that is mixed with
concentrated wastes requires special disposal, as discussed below.
Process wastewater (depending on the pollutants and associated concentrations present) can be
put into the sanitary sewer, subject to approval by the local sewer authority and the King County
Industrial Waste Program. Animal waste can be disposed of in a sanitary sewer, subject to
loading capacity constraints. The King County Industrial Waste Program may require that all
stormwater discharged to a sanitary sewer be metered. Sewer fees may be collected on such
discharges.
The first priority is to discharge process water to a sanitary sewer using an existing plumbing
connection or a new pipe connection. Whenever the diversion of any process water or other
wastewater to the sanitary sewer is needed, the local sewer authority and King County must be
contacted to obtain approval prior to discharging to the sanitary sewer. Pretreatment of
discharges to remove some of the process water pollutants may be required to obtain approval.
The local sewer authority and King County must also be contacted prior to the installation of any
permanent connection to the sanitary sewer. The name of your local sewer authority is identified
on your water and sewer bill. Sumps or other temporary storage devices may be useful for
storing liquid wastes on a temporary basis if you cannot discharge to a sanitary sewer system.
Consideration should be given to using a holding tank for process water if the volume of process
water generated by the activity is not excessive. See BMP Info Sheet 4 for more information on
holding tanks. The contents of the holding tank must be pumped out or drained before the tank is
full. Several commercial services are available for pumping out sumps and holding tanks. These
can be found in your telephone directory's yellow pages under the headings "Sewer Contractors
and Cleaners" and "Tank Cleaning," or on the King County Stormwater Services website at
http://www.kingeounty_ gov/environment/waterandland/stonnwater/prob lem-investigation-
line/drainage_maint_vendors.aspx. Septic system pumpout and hauling contractors must not be
used for disposing wastes other than domestic sewage. They are not allowed to haul industrial
wastes.
January 2009 King County Stormwater Pollution Prevention Manua!
BMP Info Sheet #2, Disposal Options (continued)
DISCHARGE TO SEPTIC SYSTEM
If your site is not serviced by a sanitary sewer system, you probably have a septic system. Only
liquid waste that is comparable to residential sewage in strength and constituency may be
disposed of in septic systems. Hazardous chemicals cannot be disposed of in septic systems.
Further, the septic system must be designed to accommodate the volume of suitable wastewater
generated. Any changes in waste volume and constituency from those present when the system
was permitted must be approved by the Seattle -King County Department of Public Health.
Stormwater, whether contaminated or not, may not be disposed of in septic systems. Animal
waste may not be disposed of in a septic system designed for single family, multifamily or
commercial properties_
Recycling facilities are a recommended option for many commercial items, including used oils,
used batteries, a variety of used auto parts, metal scrap materials, solvents, paints, and other solid
wastes. There are a number of private businesses that accept materials for recycling. In addition
there is an Industrial Material Exchange clearinghouse which facilitates the transfer of unwanted
materials from the generator to another business that can use them. The Industrial Material
Exchange or IMEX website is http://www.govlink.org/hazwaste/business/imex.
Process wastewater such as wash water can be recycled on-site as an alternative to discharge to
the sanitary sewer. There are numerous products on the market that are designed to recycle wash
water_ Contact the King County Water and Land Resources Division at 206-296-1900 for more
information.
MUNICIPAL SOLID WASTE DISPOSAL FACILITIES
Municipal solid waste disposal facilities are designed to handle solid wastes. Hazardous and
dangerous wastes and many liquid wastes must be properly disposed of at an appropriate facility.
Contact your local solid waste disposal facility or see http://your.kingcounty.gov/solidwaste/
garbage-recycling/index.asp for information on which materials are accepted at these facilities.
Call the Business Waste Line at 206-296-3976 or see http://www.govllnk.org/hazwaste/business
for information on the proper disposal of oil, antifreeze, and other hazardous wastes.
There are numerous services that can help you identify, quantify, transport, and dispose of any
waste that you may generate. Many people have their wastes picked up by a disposal contractor.
Costs of disposal vary considerably depending on the types of materials, quantities, methods of
collection and transport, and whether the wastes are mixed. The rate the contractor charges will
generally reflect the costs of testing and/or treating waste materials (if necessary) and the
subsequent disposal. It is important to keep different types of wastes separated, so that the
disposal contractor(s) can take them to the appropriate place(s) without causing inadvertent
contamination problems elsewhere, and so that you are not paying too much for disposal of
January 2009 King County Storrnwater Pollution Prevention Manual
SMP Info Sheet #2, Disposal Options (continued)
materials that are not contaminated (e.g. regular garbage). If you are properly implementing your
BMPs and collect contaminated waste materials for proper disposal, your efforts are
compromised if a disposal contractor subsequently disposes the contaminated materials as
regular garbage. Therefore, it is essential to be familiar with disposal alternatives and the
different types of contractors for each disposal option.
The Seattle -King County Department of Public Health's Waste Characterization Program serves
hazardous waste generators in Seattle and King County that have questionable wastes.
Information supplied by the generator on questionable wastes such as sludges, sandblast waste,
treated wood, and contaminated soils is reviewed by the Health Department. Permits are issued
for those wastes that will be allowed in the garbage. The dangerous waste regulations as well as
other criteria are used in the decision process.
The disposal of wastes is the responsibility of the generator. Before agreeing to let a company
handle your waste, it is recommended that you ask for (and check) the company's references. All
waste collected by the company should be delivered to an authorized site. Make sure you keep
copies of all your transactions. Transfer of waste to a vender does not release you from legal
obligation for disposal to a licensed disposal facility.
January 2009 King County Stormwater Pollution Prevention Manual
Covering Options: Tarp, Roof, or Awning
One of the most effective actions a person can take to prevent stormwater contamination is
keeping potential pollutant generating materials out of the rain. There are numerous options for
covering an activity or stored materials. This BMP, combined with the prevention of stormwater
runon into the covered area, can be as effective as storing materials or conducting activities
indoors.
The simplest cover is a tarp or other nonstructural device. Building a permanent structure may
require a building permit and must comply with all applicable building and fire codes. These
building requirements may make some structures too expensive to be practical. Contact the King
County Department of Development and I�I
Environmental Services for information on
building permits and requirements for a roof
structure.
Many activities, such as stockpiling of raver
or erodible materials or storage of drums,
can be effectively covered with a heavy
plastic tarp made of impermeable material.
Weights such as bricks, tires, or sandbags
must be used to anchor the cover in place. Tarp Covering
Care should be taken to ensure that the tarp
covers the stored materials completely and that stormwater runon does not penetrate significantly
under the cover. if several tarps are used to form a cover, they should be tethered together or
overlapped. If necessary, pins or stakes should be used to anchor the tarps to the ground. The
tarp/cover will be easier to keep in place and will last longer if some form of wind protection is
possible. Attempts should be made to locate stockpiles in areas where winds are minimal.
The tarps must be in place when the material is not being used. The tarps must be inspected
weekly to ensure that no holes or gaps are present. Tarps are inexpensive, and therefore are a
cost effective BMP for many activities. This BMP can be combined with containment for better
effectiveness_ See BMP Info Sheet 5 for more information.
The other option for covering is the use of a roof. The particular roof cover option used at a
given site is subject to the site layout, available space, affordability, and limitations imposed by
other regulations. The area of the roof should be sufficient to prevent any precipitation from
reaching the contents underneath. This BMP should be implemented in conjunction with
January 2009 King County Stormwater Pollution Prevention Manual
BMP Info Sheet #3, Covering Options (continued)
prevention of stormwater ran -on into the covered area. BMP Info Sheet 5 presents information
on containment/run-on prevention. Examples of various structures are shown below.
Lean -To Structure
Stand-alone Canopy
There are also numerous prefabricated storage sheds that can be purchased to enclose and cover
materials. This may be a preferred alternative on some sites. Before purchasing these structures
ensure they meet applicable building and fire
codes.
Another option for covering an activity or stored
materials is to use an overhanging awning of
sufficient size to prevent precipitation from
reaching the contents underneath. This cannot be
an awning already in place over a public right-of-
way such as a sidewalk in front of a store. Many
of the building permit, fire code, and zoning code
requirements mentioned above apply to these
structures.
Activities such as fueling operations may be
covered by an island -type overhanging roof.
This roof arrangement is supported by
columns along the center of the structure
rather than at the corners, enabling vehicular
traffic underneath while still providing
sufficient protection from precipitation.
Overhanging Awning
Island -Type Overhanging Roof
January 2009 King County Stormwater Pollution Prevention Manual
Pave Area and Slope to Holding Tank
This BMP applies to several activities that cannot be covered effectively, and therefore require a
method of controlling runoff from leaving your site that may be contaminated. It is particularly
suited to activities with the potential for spills and leaks, but that otherwise do not generate
excessive amounts of polluted runoff. In addition, this BMP is well suited to activities that
intermittently produce wastewater such as washing or steam cleaning operations. A sump or
holding tank serves to provide containment until the liquids can be pumped from the holding
tank and disposed of properly. If the activity produces large amounts of runoff or wastewater,
this BMP will not be very effective because contaminated water will overflow the sump or pass
through the sump before collection and disposal are possible. The following information is
intended for situations where this BMP can be effective.
A designated area must be paved and sloped to a drain connected to a central collection point. A
sump, vault, or holding tank must be installed to capture the wastewater. Some materials, such
as gasoline, can react with and cause deterioration of asphalt pavement. it is preferable for the
area to be paved with Portland cement concrete. If the area is already paved with asphalt, an
asphalt sealant should be applied to the pavement surface. Whichever paving material is used,
the paved surface must be free of gaps and cracks.
The sump or holding tank should have a large enough capacity to contain the entire volume of
wastewater generated by the activity, or the entire volume of a potential spill (whichever is
applicable, or the greater of the two). Depending on the circumstances, the sump or tank can be
equipped with an outflow pipe to allow discharge of normal, uncontaminated runoff to the storm
drainage system_ The local sewer authority may, in some instances, allow a connection to the
sanitary sewer system.
The paved activity area must also be contained to prevent stormwater runon and runoff. This can
be achieved by constructing a curb, dike, or berm that directs uncontaminated surface water
flows away from the area. See BMP Info Sheet 5 in this chapter for more information. This way,
only the precipitation that falls within the activity area is discharged and/or treated along with the
process water.
The catch basin/tank/sump must have a two-way valve installed at the outflow pipe so that
uncontaminated runoff from the activity area can discharge to the storm drainage system at times
when the pollutant generating activity is not occurring. The two-way valve must easily switch
between discharges to the sanitary sewer, holding tank, or treatment facility, and discharges to
the storm drainage system. Each time the activity is occurring, the two-way valve must be
switched so that the polluted runoff discharges to the sanitary sewer, holding tank, or treatment
January 2009 King County Stormwater Pollution Prevention Manual
BMP Info Sheet #4, Pave Area and Slope to Holding Tank (continued)
facility. After the pollutant generating activity operation is finished and no more process water is
generated, the area must be sprayed, hosed, or otherwise washed down with the wash water
discharging to the sanitary sewer, holding tank, or treatment facility. The two-way valve must be
switched after clean up is completed so that subsequent runoff is discharged to the storm
drainage system until the next time the activity that produces wastewater occurs. It is critical that
careful attention be given to this valve so that it is always switched to the correct position.
Approval for discharges with a two-way valve should be obtained from the King County
Industrial Waste Program, the local sewer authority and King County Water and Land Resources
Division, Water Quality Compliance Program.
If discharges to the storm drainage system or sanitary sewer are not allowed, the sump or holding
tank contents will need to be pumped out periodically and disposed of properly. This
requirement can make this BMP costly, especially during the wet season. See BMP Info Sheet 2
for disposal options.
An example of paved activity area with a sump
drain is shown to the right.
Drainage into the sump or holding tank should
only occur at times when the activity that
generates wastewater is occurring. To keep
disposal costs down, a drain cover, plug, or
shutoff valve in the pipe leading to the sump
should be used at times when the activity is not
occurring. Before starting the activity (if the
activity is intermittent), the cover, plug, or valve
must be opened.
Paved Area with Sump Drain
The cost of constructing a sump and disposing of
accumulated contents can be high, so businesses should consider whether other allowable BMP
alternatives could be used. Individual cities, sewer agencies and King County may charge
additional fees if a sanitary sewer hookup is made. The fees depend on location, quantity of
discharge, and whether the hookup is for a business or residence. A King County industrial waste
discharge permit may also be required in some situations.
Several commercial services are available for pumping out sumps and holding tanks. These can
be found in your telephone directory's yellow pages under the headings "Sewer Contractors and
Cleaners" ,and "Tank Cleaning." You can also find information on Drainage Maintenance
Contractors on the King County Stormwater Services website at
http://www.kingcounty.gov/environment/waterandland/stormwater/problem-investigation-
line/drainage_maint vendors.aspx or by calling 206-296-1900. Septic system pump -out and
hauling contractors must not be used for disposing wastes other than domestic sewage. They are
not allowed to haul industrial wastes.
January 2009 king County Stormwater Pollution Prevention Manual
Secondary Containment and Elevation:
Surround with Dike or Berm, or Elevate
These BMF options can be an effective means for prevention of uncontaminated stormwater
from flowing into or onto a contaminated activity area. These BMPs also explain containment of
spills in activity areas where pollutants may be present. These BMPs may be less expensive to
implement than paving the area and providing storm drainage collection, but can also be more
difficult to maintain if stormwater ponding occurs inside a secondary containment dike.
If a curb, berm, or dike is used to prevent stormwater run on to a covered area, and the area is
paved or otherwise impermeable, it should be covered so that precipitation will not pond inside
the secondary containment area. In some instances, run on prevention can be accomplished by
placing a curb or berm on the upslope sides of the area. Elevating the activity or stored materials
with a platform or other type of pedestal can also prevent stormwater run-on.
Secondary containment may be achieved with concrete curbing, an earthen berm, a tub such as a
plastic wading pool, or some other dike structure, depending on the activity, its size, and
resources available_ If a curb, berm, or dike is used to contain possible spills, and other
containment regulations (such as fire codes or Washington State Department of Ecology
requirements) do not apply, the containment area must be sized to hold a volume of 110 percent
of the volume contained in the tank/containers.
Secondary containment without a cover generally will allow rainwater to accumulate in the
containment area. Contaminated water cannot be drained from the containment area to surface
water or the ground. The water must be collected and disposed of either into a sanitary sewer, a
stormwater treatment system, or at a licensed decant facility. During the wet season, secondary
containment without any cover provisions can lead to frequent disposal of relatively clean water
that can be costly. In addition, monitoring may be needed to determine if the water is
contaminated. If the stormwater is typically clean, or if a stormwater treatment system is present
on-site, a valve must be installed in the secondary containment area so that excess stormwater
can be drained out of the containment area and directed either to storm drainage facilities (if
clean) or into the stormwater treatment system (if contaminated), whichever applies. If a
discharge valve is installed in the containment area, the valve should always be kept closed
unless excess stormwater is being discharged, so that any spills that occur within the area can be
contained. Local sewer authorities and the King County Industrial Waste Program may not allow
discharges from a large containment area into the sewer system_ Discharge authorizations from
the local sewer district must be obtained prior to releasing water from containment areas into the
sanitary sewer system.
January 2009 King County Stonnwater Pollution Prevention Manual
BMA Info Sheet #5, Secondary Containment and Elevation (continued)
If containment is used for stockpiles of erodible material, a dike, berm, or filtering device such as
basic erosion control must be placed on at least three sides of every stockpile to act as a barrier
or filter to treat runoff and to remove suspended solids. If the containment device is three -sided,
the open side should not be on the upslope or the downslope side of the stockpile, if feasible. The
dike or filter can be made of hay bales, silt fencing (filter fabric), concrete curbing, ecology
blocks, compacted earth with grass planted on it, or similarly effective materials. Timbers treated
with creosote or other preservatives should not be used because they can leach contaminants into
runoff. If ponding occurs due to a sturdy dike, filter materials should be used instead_ All filter
materials used around stockpiles must be maintained to work effectively and must be replaced
when necessary {see Appendix D of the Surface Water- Design Manual for other options.
.Simple Containment Devices
For storage of small items, a simple containment
device is a tub or wading pool. A rubber or
plastic wading pool may be sufficient for
containment of some stored materials that do
not require a lot space, such as storing
remodeling and painting materials, and
temporary storage of wastes in drums. These
small storage devices should also be covered
with a tarp or other cover. An example of this is
shown to the left. You must also take into
consideration the type of materials stored to
ensure adverse chemical reactions do not occur
with the containment material_
It should also be noted that neglect and poor maintenance can render the secondary containment
useless. Maintenance of containment devices must be stressed, as maintenance is essential for
containment to work as intended. Commercial products are available that are a combination of
containment boxes/elevated pedestals. These commercially available products prevent
stormwater run-on by elevating containers of liquids (such as drums) off the ground and
collecting spills and drips inside the pedestal box.
Containment Dike
Containment Curb
January 2009 king County Stormwater Pollution Prevention Manual
Integrated Pest Management
The use of herbicides, insecticides, fungicides, and rodenticides can be extremely harmful to the
environment due to the highly toxic nature of many chemicals in pesticide products. In light of
this, special attention should be given to pesticide use in all applications. The discussion below
applies more to large scale pesticide users, but should be considered for backyard applications as
well.
Commercial, agricultural, and other large scale pesticide users such as golf courses and parks
should adhere to the principles of integrated pest management (IPM), a decision-making process
for pest management that strives for intelligent, environmentally sound control of pests. It is a
systems approach to pest management that combines agronomic, biological, chemical, and
genetic information for educated decisions on the type ofcontrol(s) to use, the timing and extent
of chemical application, and whether nonchemical means can attain an acceptable level of pest
control.
IPM is a preventive measure designed for the exact pest(s) being targeted for control, the
locations and times when pests will pose problems, the level of pest -induced damage that can be
tolerated without taking action, the most vulnerable life stage, and control actions that are least
damaging to the environment. The major components of IPM are as follows: monitoring and
inventory of pest populations, determination of pest -induced injury and action levels,
identification of priority pest problems, selection and timing of least toxic management tools,
site-specific treatment with minimized chemical use, and evaluation and adjustment of pesticide
applications. Monitoring of pest populations is a key to successful IPM implementation. Pest
problems are universally easier to control if the problem can be discovered early. With IPM
pesticides are used only as a last resort; maximization of natural controls, including biological
controls and removal of pests by hand, is a guiding rule.
A list of IPM resources is available on the web at
ht ://www.eovlink.org/hazwaste/initmggac/i m/index.cfm or
hqp://www.goviink.org/hazwaste/ ublications/iPMKCGuidelines. df.
January 2009 King County Stormwater Pollution Prevention Manual
Maintenance of Drainage Systems
Many commercial, industrial, residential and public agency properties have storm drainage flow
control and water quality systems to capture and treat stormwater flows. Most of these systems
have catch basins as key components. Catch basins are typically located along curbs, at low spots
in parking lots, and where stormwater conveyance pipes combine flows. Storm drains collect
runoff that directs flows into basins and pipes that are located underneath parking lots and storm
drain grates. Most catch basins have a few feet of storage in the bottom or sump. This storage
area is intended to trap sediment, debris, and other particulates that settle out of stormwater, to
prevent clogging of downstream pipes and to keep solids from being flushed into receiving
waters.
Anyone who has ever looked into a catch basin can attest to its ability to capture dirt, leaves,
twigs, litter, and a variety of other materials that make for a mucky buildup in the bottom.
However, if the sump (the bottom of the catch basin) is full of solid material, everything in the
incoming runoff passes straight through to an outflow pipe. The bottom (or sump) in catch basins
must be cleaned out periodically so they can continue to trap solids from stormwater runoff.
Routine maintenance practices at all sites with storm drains and catch basins must include
cleaning/removal of sediment or solids from these important drainage system features. If catch
basins are not cleaned, they can actually contribute to receiving water pollution problems as
trapped solids, and stagnant, polluted water in sumps can be flushed out in large quantities with
turbulent storm flow conditions.
Check your catch basins annually for needed maintenance timed to occur before the rainy
season. For organizations with large numbers of catch basins (greater than SO per site),
inspections may be conducted on a "circuit basis" whereby sampling of representative catch
basins, including the lowest one in the circuit, within each circuit is inspected to identify clean-
out needs for the circuit. The annual catch basin inspection schedule may be changed as
appropriate to meet the maintenance standards based on maintenance records of double the
length of time of the proposed inspection frequency. Catch basins must be cleaned out when the
solids, trash, and debris in the sump reaches one-half of the depth between the bottom of the
sump and the bottom (invert) of the lowest inflow or outflow pipe connected to the catch basin or
at least 6 inches below this invert. The rate at which a sump fills with solid material is quite
variable, and depends on the characteristics of the drainage basin feeding into it. If activities that
generate a Iot of sediment are taking place in the drainage area that contributes stormwater flows
to a catch basin, such as exposing soils due to construction or landscaping, stockpiling erodible
materials, or if your site is not paved and has heavy traffic use on dirt or gravel surfaces, the
sump will fill up relatively quickly. Therefore, sites with activities generating a lot of sediments
and other debris will have to inspect and clean out their catch basins more often.
January 2009 King County Stounwater Pollution Prevention Manual
BMP Info Sheet #7, Maintenance of Drainage Systems (continued)
Other components of drainage systems include ponds, tanks, and bioswales. These components
must also be maintained to ensure your drainage systems functions as designed_ Vegetation in
ponds and bioswales must be mowed or thinned, and sediment accumulations must be removed.
Maintenance of ponds, tanks, and bioswales is generally beyond the ability of the typical
property owner. Drainage system maintenance contractors are available to complete this work.
If you clean out/maintain the catch basins yourself, you may dispose of up to one cubic yard of
solid material as solid waste in your regular garbage. If you exceed this threshold you are
encouraged to contact a company offering catch basin cleaning services. You can locate a
cleaning service by calling the King County Water and Land Resources Division at
206-296-1900 for a list of firms performing drainage system maintenance services or in your
telephone directory's yellow pages under headings like "Sewer Cleaning Equipment and
Supplies," "Sewer Contractors," and "Tank Cleaning." All of the solids and stagnant water
collected from catch basin sumps must be disposed of properly. None of the sump contents can
be flushed into the catch basin outflow pipe. Depending on the nature of the pollutants in the
sump, and the associated types of activities taking place on the site, the sump contents may need
to be handled as contaminated waste. Contractors who perform catch basin clean-out services are
required to follow appropriate disposal requirements.
Frequent sweeping of paved parking and storage areas, covering pollutant generating activity
areas, and containing runoff from activity areas will help reduce catch basin and drainage system
cleaning frequency, and may save time and money spent on required maintenance. All
businesses and public agencies should set up maintenance schedules for all of their BMPs so that
coordinated BMP efforts result in reduced catch basin and drainage system maintenance and
cleaning.
January 2009 King County Stormwater Pollution Prevention Manua!
Water Quality Treatment BMPs
Water quality treatment BMP options may be required if operational or basic structural source
controls do not adequately address pollutant discharges from your site. Source control BMPs, as
presented in Chapter Three, must always be implemented before treatment BMPs are
considered.
The following information describe some basics of water quality treatment systems/facilities.
Design and construction details can be found in the King County Surface Water Design Manual
(which contains relevant information for the treatment BMPs discussed). A private vendor
specializing in the treatment system or an engineering consultant can provide information on
treatment systems.
Businesses and agencies are allowed to select a treatment BMP other than those presented in this
manual if they follow the adjustment process as outlined in the King County Surface Water
Design Manual or if they complete the Alternative BMP request in this manual.
Table 5.2 (next page) presents a brief description of some typical water quality treatment BMPs.
Table 5.3 presents water quality treatment BMPs for removing specified pollutants. One
treatment BMP usually cannot treat all pollutant problems. Each BMP is designed for a specific
purpose and is capable of removing only specified pollutants. If you decide to install a water
quality treatment BMP, always ensure that it is removing the pollutant of concern from your site
runoff.
January 2009 King County Stormwater Pollution Prevention Manual
BMP Info Sheets #8, Water Quality Treatment BMPs (continued)
TABLE 5.2
WATER QUALITY TREATMENT BMPs
TREATMENT BMP
BRIEF DESCRIPTION
Oil/Water Separator
An underground vault specifically designed to remove oil and grease.
Also will remove floatable and some settleable solids.
Catch Basin Insert
A filtering device that is installed within an existing catch basin and
uses various sorbent materials and settling space to collect pollutants.
Catch Basin Sump and Vault Filter
A device similar to catch basin inserts, only larger and placed
underground.
Leaf Compost Filters
A filtering device that is installed above or below ground and uses
leaf compost to remove pollutants from stormwater.
Wet Pond, Constructed Wetland,
A wet pond is a stormwater pond that retains a permanent pool of
Wet Vault
water. A constructed wetland is similar to a wet pond, but shallower
and supporting wetland vegetation in large areas. A wet vault is an
underground, covered, engineered structure that retains a permanent
pool of water.
Vegetated Biofilter - Biofiltration
A biofiltration swalc is a long, gently sloped ditch or depression
Swale and Filter Strip
designed to treat water as it passes through the vegetation. Grass is
the most common vegetation. A filter strip is a grass area, wider than
biofilters, also with gentle slopes. Water usually enters as sheet flow
from the adjacent pavement.
Sand Filter
A structure placed in the landscape, with grass grown on top, or in
vaults. Stormwater passes through the sand allowing particulate
pollutants to be filtered out.
Infiltration
A normally dry basin which temporarily stores stormwater until it
soaks through the bottom and sides of the basin, and infiltrates into
surrounding soil_
Chemical Treatment
See the King County Design Manual for allowable chemical
treatment including chitosan and alum and CO2 sparging.
January 2009 King County Stormwater Pollution Prevention Manual
BMP Info Sheets #8, Water Quality Treatment BMPs (continued)
TABLE S.3
APPROPRIATE USES FOR WATER QUALITY TREATMENT BMPs
POLLUTANTS TO REMOVE
APPROPRIATE TREATMENT BMPs
Oil/Grease
Oil/water separators; catch basin inserts; catch basin
Sources: vehicle and equipment areas,
sump/vault filters, leaf compost filters.
industrial areas, food preparation
Sediments/Solids
For coarse sediments -Wet pond/vault; constructed wetland
Sources: sand/gravel storage, construction
(with forebay); vegetated biofilter; sand filter; catch basin
sites, unpaved areas, agriculture/livestock
insert; catch basin sump/vault filters; leaf compost filters.
uses
For fine sediments -Wet pond/vault; constructed wetland
(with forebay); vegetated biofilter; sand filter. Also see
catch basin sump/vault filters. Chemical treatment
Phosphorus Compounds
For particulate phosphorus -Wet pond/vault; constructed
Sources: detergents/cleaners, fertilizers,
wetland (with forebay); vegetated biofilter; sand filter. If
organic matter, animal wastes
dissolved phosphorus must also be removed - a large
"oversized" wet pond or sand filter.
Nitrogen Compounds
For particulate nitrate -Wet pond/vault, constructed wetland
Sources: fertilizers, animal wastes, organic
(with forebay); vegetated biofilter; sand filter. For dissolved
matter
nitrate - constructed wetland.
Metals
For particulate metals -Wet pond/vault; constructed wetland
Sources: industrial areas, vehicle and
(with forebay); vegetated biofilter; sand filter. For dissolved
equipment areas, paints, pesticides
metals - leaf compost filter or constructed wetland.
Fecal Coliform Bacteria
There is no treatment BMP that can reliably reduce fecal
Sources: animal wastes; fertilizers
coliform bacteria to acceptable levels. Some studies have
shown constructed wetlands provide some benefit_
pH
A constructed wetland can neutralize some ranges of pH.
Sources: metal plating, printing/graphic
industries, cement/concrete production,
cleaners
BOD and Trace Organics
For particulate BOD - see "particulate nitrate" above. For
Sources: organic debris, food wastes, some
dissolved BOD -A constructed wetland will remove some
chemical wastes
dissolved BOD and trace organics; more reliable
performance requires activated carbon.
January 2009 King County Stormwater Pollution Prevention Manual
Oil/Water Separator
An oil/water separator is a device designed to remove oil, grease, and similar floatable pollutants
from stormwater runoff. The name commonly refers to an underground structure. If a site
requires spill control due to fueling activities, more simple designs exist.
Oil/water separators are appropriate at locations where petroleum products may be difficult to
control with source -control BMPs. An oil/water separator can be a tee section in a catch basin
that contains spills on an emergency basis, or a complex unit that is designed to treat runoff from
sites with high vehicle use, equipment storage and parking or fueling areas. Tee sections or down
turned elbows are only effective in controlling and temporarily capturing and containing spills.
Spills must be cleaned up immediately to avoid downstream contamination of surface waters and
other natural resources.
For many sites, such as small parking lots, a simple tee section in a catch basin will temporarily
retard pollutants, making it possible to clean up a spill before pollutants leave the site. On sites
with greater potential for oil spills and high concentrations of oil and grease in runoff, such as a
fleet vehicle lots, auto repair shops, or fueling stations, a more complex oil/water separator is
needed_
Tee sections or down turned elbows or "snouts" can be placed in catch basins along with oil pads
and booms in the primary conveyance system. Because of their simplicity, there are few
restrictions on their application and locations of use. If tee sections are used or installed in catch
basins, other measures must be used such as oil absorbent pads or booms.
There are two types of complex oil/water separators commonly used in situations where oily
runoff is a significant concern: the American Petroleum Institute (API) and the coalescing plate
interceptor (CPI). The API separator has the appearance of a long septic tank_ An API separator
must be large relative to the area it is treating to be effective. By placing coalescing plates in the
separator, its size can be significantly reduced while retaining the efficiency needed,
Consequently, the CPI separator is more commonly used. The savings from reducing the cost of
vault construction offset the relatively high cost of the plates.
These oil/water separators should be used for targeted pollutant removal in high traffic areas
where oil or petroleum products are a significant problem rather than as an all-purpose
stormwater treatment facility_ The separator will function more efficiently and require less
January 2009 King County Stormwater Pollution Prevention Manual
BMP Info Sheet #9, Oil/Water Separator (continued)
maintenance if the amount of stormwater passing through is limited. Only runoff that has been
exposed to high oil activity areas should be directed through the oil/water separator_ Avoid
directing stormwater (from other areas on your site) through the separator.
For information on oil/water separators that will be used as pretreatment prior to discharge to the
sanitary sewer, contact your local sewer agency or King County's Industrial Waste Program
within the Wastewater Treatment Division.
DESIGN AND MAINTENANCE
API and CPI oil/water separators must be designed and sized in accordance with the King
County Surface Water Design Manual.
Oil/water separators must be checked frequently during the wet season. These inspections must
occur often enough to prevent BMP failure that allows waste products to exit the oil/water
separators, or risk violating King County Code 9.12 and be cited. How often material should be
removed depends on the amount of petroleum in the influent, but the separator should be cleaned
at least quarterly, and particularly in the fall before the first storm of the wet season. All residuals
removed from the surface and vault bottom must be disposed of properly. In addition, the
following maintenance requirements apply:
♦ Oil absorbent pads should be replaced as needed, but should always be replaced in the fall
prior to the wet season, and in the spring.
The outlet pipe of the separator must be blocked during cleaning operations.
♦ Waste oil and residuals shall be disposed of in accordance with current Seattle -King County
Department of Public Health requirements. Several vendors handle waste oil hauling and
disposal.
♦ Any standing water removed during the maintenance operation must be disposed to a
sanitary sewer at a discharge location approved by the local jurisdiction.
January 2009 King County Stormwater Pollution Prevention Manual
Catch Basin Insert
A catch basin insert is a device installed in a storm drain to provide water quality
treatment through filtration, settling, or absorption. Catch basin inserts are not a
requirement for properties in King County unless other source control measures are not
effective.
Catch basin inserts are products which fit into existing catch basins and are generally configured
to remove one or more of the following contaminants: coarse sediment, oil and grease, and litter
and debris. It has been suggested that some units may be able to remove dissolved pollutants and
pollutants associated with fine sediments_ When selecting an insert, ensure that your specific
pollutant -removal needs are met. As with any treatment BMP, catch basin inserts should never
be used in place of sound source control practices.
Gil and Grease Removal: Inserts designed for the removal of oil and grease contain, and depend
on, oil -absorbing media. The King County Surface Water Design Manual (SWDM) requires
specific materials/media to be used in catch basin inserts to ensure oils are not re-released during
storm flows. These materials are described in Section 6.1.2 of the SWDM. These inserts are
appropriate for use in any area in which vehicles are used, maintained or stored. Because of the
small storage capacity of these inserts, they are not acceptable as the sole line of defense against
actual oil spills in areas where large amounts of oil could be released. Large amounts of sediment
entering the catch basin significantly reduce the effectiveness and longevity of the oil absorbing
media. Under these conditions, an oil/water separator with a pre -settling chamber may be more
appropriate.
Sediment Removal: Inserts designed for sediment removal may be used at construction sites, and
in situations where stockpiles or unpaved areas are likely to contribute high sediment loads. They
may also be appropriate for small (low traffic) businesses. They are not considered a substitute
for other pollutant -removal BMPs.
Debris Removal: Inserts can also be used for the removal of litter and debris. Some evidence
suggests that the removal of large debris such as cigarette butts, candy wrappers, and beauty bark
reduces the amount of bacteria and solids in receiving waters.
January 2009 King County Stonnwater Pollution Prevention Manual
BMP Info Sheet #10, Gatch Basin Insert (continued)
DESIGN AND MAINTENANCE
Unlike most other treatment BMPs, which must be designed and constructed specifically for
your site, catch basin inserts may be purchased directly from a vendor and installed by the user.
While standardized insert units are available, most vendors are able to customize their systems
for your site. This service may improve the performance of your drainage system while adding
relatively little to the cost of the product. Before purchasing a catch basin insert, the following
factors must be considered.
Conveyance Ca aei : The conveyance capacity refers to the amount of water that the insert can
pass without causing flooding. This capacity is equal to the amount of water that is able to pass
through the insert's treatment area, plus the amount that can pass through the built-in overflow.
As the unit treats the stormwater, the treatment area begins to clog and the total conveyance
capacity is reduced. If maintenance is neglected, or an unusually high amount of sediment or
debris enters the system, the treatment capacity may drop to zero, and all of the water will have
to exit through the overflow. In order to minimize the chance of flooding, the insert should be
able to pass the maximum expected flow from the area draining to the catch basin. The vendor
should be able to tell you what the overflow capacity is.
Treatment Capacity and Bypass: The treatment capacity refers to the amount of stormwater that
the insert unit will pass through its treatment area. The insert unit should be sized to ensure that
most of the water entering the drain inlet is treated even as the treatment area starts to clog. The
ability of the insert to remove pollutants will be reduced if water is able to seep between the
storm drain grate and the edge of the pavement. Ensure that this gap is sealed_ The vendor should
provide you with information on how to prevent this situation and information on the treatment
capacity of the system.
Maximum Weight: The maximum weight of the insert/filter will be equal to the weight of the
insert/unit when new, plus the weight of the sediment and water trapped in the unit. Under the
most extreme cases, the treatment area of the insert/unit may become completely clogged, and
the unit may be full of water when it comes time to service it. It is essential the maximum weight
of the insert be less than what can be lifted by the people or equipment to be used during
maintenance. Before ordering a system, or having a system customized to your site, be sure the
vendor knows how you will be removing the insert/unit for maintenance.
Simplicity and Durability: Since the installation of one or more catch basin inserts represents a
long-term commitment to maintenance, it is important that the unit selected be easy to use and
maintain, and that it is built to last. Be sure to have the vendor provide a complete demonstration
of the product at your site, and if possible, ask to try an insert for an extended period of time
before committing to its purchase and use.
Catch basin inserts will generally require more frequent, but less costly maintenance than other
treatment BMPs. Frequent inspection of the insert is necessary to ensure that it is not clogged by
large debris. Actual maintenance will generally consist of removing the insert from the catch
basin, cleaning or replacing the filter media (if applicable), and re -installing the catch basin
insert.
January 2009 Icing County Stormwater Pollution Prevention Manual
BMF' Info Sheet #10, Catch Basin Insert (continued)
In addition to the weight considerations mentioned above, you must ensure that the drain inlet
will not be obstructed when it is time to clean the filter, that you have the time and personnel to
do the job (or can arrange for this service through a private contractor), and that you have a legal
means of disposing of the trapped material and spent media. In most cases these materials may
be disposed of as regular solid waste, however, media used for oil and grease removal may
require special treatment. See BMP Info Sheet 2 in this chapter for more information on disposal.
Maintenance frequency will vary depending on the amount and type of pollutant targeted. Tests
conducted by King County suggest that initially, all units should be inspected every one to two
weeks (except during periods of dry weather), and that complete maintenance will be required
approximately monthly. Units configured simply to catch litter and debris may work for several
months without maintenance. The simplest way to determine whether the units need maintenance
is to inspect them during a rainstorm and see whether water is exiting out the overflow. If this is
the case, the unit is probably in need of service. Alternatively, the depth of sediment
accumulation or appearance of the filter media may provide insight as to whether the unit is in
need of maintenance. Again, be sure the vendor provides you with this information.
January 2009 King County Stormwater Pollution Prevention Manual
Processing Requirements for Use of Soil Amendments on Construction Sites
Purpose: This Info Sheet establishes procedures for implementing BMPs when using soil
amendments on construction sites. See Activity Sheet 43, "Use of Soil Amendments on
Construction Sites" for a description of the BMPs. This document outlines an expedited review
process and typical approval conditions that will allow contractors and builders to use soil
amendments without impacting water quality. Additional BMPs may be required based upon site
specific conditions that may warrant more protection. This policy is limited to those
amendments, defined below, commonly known to add stability to sloppy soil conditions but can
alter water runoff quality.
Use of Soil Amendments: It is sometimes a construction practice to add soil amendments to the
surfaces of some construction areas in order to stabilize the ground for building. This practice
includes placing an additive on the ground then mixing with the soil to a specified depth and
finally compacting the mix. When mixed with the soil, the moisture in the ground may allow
these additives to create a chemical reaction that cures similar to concrete and may absorb
excessive moisture to allow soils to be compacted. The end result is a stable site for constructing
a road or building pad.
Because soil amendments may be rich in lime content and other material, water runoff from
these areas can be affected. If not controlled and treated, this could result in a degradation of
water quality and natural drainage systems. Because these additives come in a fine powder form,
the actual application can create fugitive dust. When mixed with water, some additives can
become corrosive_
Authority: KCC 9.12.025 prohibits discharges of polluted or contaminated water into surface or
storm water drainage systems. The purpose of this statute is to protect surface and ground water
by regulating the discharge of potentially contaminated surface water. If soil amendments are
proposed with an initial application, an environmental review is required, under SEPA, which
assesses impacts, provides public input and mitigated conditions for its use.
King County Road Standards, Section 4.02 also requires an engineered design for use of a soil
amendment on road surfaces or around drainage systems. The design may incorporate a thorough
assessment of soil composition and laboratory analysis_ The Surface Water Design Manual
authorizes DDES to adopt BMPs for the control and protection of surface water. Currently, for
all sites, the BMPs established in this policy are the minimum standards that shall be applied.
January 2009 Icing County Stormwater Pollution Prevention Manual
BMR tufo Sheet #11, Processing Requirements for Use of Soil Amendments on Construction Sites (continued)
Definitions:
The following are definitions of soil amendment products that are allowed for use under these
procedures:
1. Cement Kiln Dust (CKD) is a by-product in the manufacturing of cement.
2. Cement Treated Base (CTB) utilizes Portland Cement Type 11 as the soil additive.
Procedure: An applicant may apply for use of soil amendments allowed under this policy
anytime during the permit application review or after the permit has been issued and site
construction is underway. After making a submittal to DDES, the applicant may receive approval
conditions. Conditions may vary from site to site, but typically will include many of the BMPs
included in this policy.
Applicants should identify any use of soil amendments as early in the process as possible to
avoid delays in obtaining approval for use during the construction phase. If a site has known soil
and water conditions that might make work during rainy periods difficult, they may want to plan
to use soil amendments on their site. Obviously, if this issue is addressed at the permit review
phase, implementation in the field can occur without delay. However, because of the potential
risks of surface water pollution discharge and required treatment, an environmental assessment
will be necessary before conditions for use can be established.
Limitations: This policy applies to intended the use of soil amendments in areas that will be
covered impervious surfaces. For areas not covered by impervious surfaces, additional reviews,
study, and BMPs may be required. In addition, alterations to original approved use plans will
require a resubmittal for approval. Approval for the use of the soil amendments in
unincorporated King County can only occur by strictly following the procedures contained
herein and not by any other approval obtained from DDES.
Submittal Requirements: To obtain approval for the use of soil amendments allowed under this
policy, the applicant shall prepare a submittal package to DDES that includes the following:
• Letter to DDES requesting use of soil amendments at a construction site allowed under this
policy.
• Document or letter attachment that identifies source of materials and description of mixing
and laydown process, plan for disposal of treated contact water, sanitary sewer permits
and/or BMPs, and special precautions proposed to prevent the contamination of surface or
stormwater drainage systems, other than 'sealed' drainage systems..
• Site Plan: Show a site plan map which:
1) Shows overall grading plan showing existing and proposed contours.
' CKD is collected by air pollution control devices used to clean kiln exhaust during the manufacturing of Portland
Cement. EPA has classified CKD a non -hazardous waste product provided management standards are followed for
groundwater protection and control of fugitive dust releases.
CKD should not to be confused with Fly Ash, which is a by product of burning coal or wood and incineration of
other material. Fly ash can contain major oxides and trace metals, depending upon the fuel source, and is considered
too hazardous for use as a soil amendment. Using this product is not authorized or endorsed by DOE or King
County,
January 2009 icing County Stormwater Pollution Prevention Manua!
BMP Info Sheet #11, Processing Requirements for Use of Soil Amendments on Construction Sites (continued)
2) Identifies sensitive areas and permanent or temporary drainage facilities.
3) Identifies areas that soil amendment is planned.
4) Shows depths of application and percent of amendment to be used.
5) Shows location of special wheel wash facility.
6) Shows location of collection and conveyance swales or pipes for contact water.
7) Shows location of sealed storage/treatment tanks or temporary ponds (fully lined).
8) Identifies any discharge point from the site into natural drainage systems.
9) Includes soil log locations that identify seasonal high groundwater areas.
• Report and analysis of engineering mix design which includes depths of application and
percent of amendment usage.
• For proposals that use CKD and CKD additive, provide analysis of source material for
soluble contaminants. Include a description of fuel source.
• Monitoring criteria, including locations for pH and turbidity testing.
• Provide contingency plan should use of soil amendment and site and weather conditions
result in polluted or contact water entering natural drainage systems.
• Provide contact information or water quality specialist assigned to monitor application of soil
amendments and BMPs.
If the project is under construction, the applicant shall contact the DDES inspector assigned to
the project to initiate a review for compliance with the BMPs and requirements herein.
Otherwise contact the planner or engineer assigned to review the permit or land use application.
Review and Approval: Once the review has been completed, the applicant shall be notified by
letter which stipulates the conditions of approval. Prior to authorizing the use of soil amendments
at the site, the applicant shall provide a special restoration financial guarantee cash deposit in the
amount as determined by the existing, established processes. Note: It remains the
applicant/contractor's responsibility to comply with any other applicable state or federal
regulations such as use of NIOSH respiratory protection, safety goggles, gloves and protective
clothing whenever using hazardous materials.
Applicable Standards.
Typically, all proposals using soil amendments in unincorporated King County shall have these
conditions as standard requirements:
1. Prior to any application of CKD/CTB, the general contract shall hold a preconstruction
meeting with the assigned DDES inspector at least 3 working days in advance.
2. CKD will not be permitted for use in areas adjacent to or in proximity to wetlands and
streams areas. CTB may or may not be permitted in these areas.
3. Areas not covered by impervious surfaces:
• CKD will not be permitted in areas that will not be covered by impervious surfaces.
• If CTB is proposed in these areas, an analysis of whether or not the soil amendment will
change the post -development runoff characteristics and the permanent stormwater
facilities were sized appropriately shall be submitted for review. Use of CTB in areas not
permanently covered by impervious surface may require re -sizing of the permanent
stormwater facilities.
January 2009 King County 5tonnwater Pollution Prevention Manual
BMP Info Sheet #19, Processing Requirements for Use of Soil Amendments on Construction Sites (continued)
4_ If CKD is proposed, the contractor shall provide mill certificates verifying the product
composition. The contractor/developer must be prepared to follow BMPs during and after
soil treatment and be prepared to treat runoff from the treatment area(s) immediately. All
stormwater collection systems must be in place and all equipment (pH meters, dry ice, etc.)
must be onsite.
5. Collection of stormwater (see BMP # 5):
• Stormwater from the application area shall be kept separate from and prevented from co -
mingling with uncontaminated stormwater.
• During the application of CKD/CTB, stormwater runoff shall be collected in temporary
collection systems and shall not be allowed to enter the permanent facilities. Permanent
drainage systems shall be capped to prevent contact stormwater from entering the inlets
of the catch basins. Stormwater from the application area shall not be collected in the
temporary/permanent detention ponds, even if the underlying soils are 'impermeable'.
6. Treatment: If necessary, pH adjustment shall be done in the collection tanks or temporary
ponds and not in the permanent detention ponds.
7. Disposal options: The proposal to use CKD/CTB must contain a disposal plan that may
include one or a combination of sanitary sewer or approved offsite disposal. Treated contact
water may be discharged to the sanitary sewer if authorizations are obtained from the King
County Industrial Waste Program (206-263-3000) and the local sewer district. All discharge
conditions (e.g. pH, settleable solids) must be followed. If a sanitary sewer is not available at
the site, contact water may be transported offsite to an approved site for disposal and proof of
proper disposal must be submitted to King County. All authorizations for disposal shall be
obtained prior to CKD/CTB application.
• Infiltration: Depending on the site conditions, pH -adjusted stormwater may be infiltrated_
Prior to infiltration, pH must be between 6.5 and 8.5.
• Surface Water: Contact water from the application area shall not be discharged to surface
waters, even if treatment has adjusted the pH.
S. Emergency backup plan: An emergency backup plan must be prepared and ready to
implement to handle large quantities of stormwater.
9. Monitoring shall be conducted to determine that contact stormwater is not leaving the site.
Offsite monitoring shall also be conducted to identify impacts to adjacent water bodies.
Bonding may be required to cover mitigation of impacts and restoration.
10. A soils specialist will establish the mixing percentage for onsite soils. Soil amendments will
never occur in excess of the ability of the onsite equipment and resources to meet all BMP
requirements_
11. For sites one acre or larger, a National Pollutant Discharge Elimination System (NPDES)
Construction Stormwater permit must be obtained from DOE. NPDES permits and
'Stormwater Pollution Prevention Plans' (SWPPPs) must be amended and the use of
CKD/CTB must be approved by DOE prior to application.
The contractor/developer shall comply will all federal, state, and local regulations. A health and
safety plan may be required for the protection of King County inspectors.
Additional BMPs may be applicable depending on mix design, proximity of wetlands or streams
(e.g. within 300 feet of class/type I and 100 feet or less for other types) and site conditions.
January 2009 King County Stormwater Pollution Prevention Manual
Introduction......................................... 1
Technical Assistance........................................................................... ...........1
General BMP Selection..........................................................................................2
Sanitary Sewer Agencies.................
Hazardous Waste Management—, .......................................................................... 3
Commercialand Hobby Farms.............................................................................. 5
Landscaping, Nursery, and Golf Course Practices................................................ 6
Land Use Requirements.........................................................................................7
Erosion Control Practices...................................................................................... 8
Recycling and Reuse Practices.............................................................................. 9
SolidWaste Disposal ..........................................• --.....----------..--............................10
Boat and Marina Practices.................................................................................... 11
Scrap Metal Industry Practices............................................................................. 12
Labor Support for Implementation....................................................................... 13
Activities that May Result in Prohibited Discharges..................................13
Quick Phone Reference., ........................ — ............................................................ 16
The quality of stormwater runoff from commercial and industrial developments,
residential areas, and agricultural lands is of increasing concern with respect to
protection of water resources in King County. Much of our water pollution is due to
pollutants that are washed off the land during and following storms, eventually
degrading surface and ground waters. Runoff from urban areas is one of the leading
causes of water pollution in the United States. The Best Management Practices
(BMPs) in Chapter 3 (for business and multifamily activities) and Chapter 4 (for
single family residential activities) serve to reduce the amount of pollutants entering
our water.
This chapter provides information on where you may obtain technical assistance for
understanding, choosing, and designing appropriate BMPs for your property. The
information is identified according to subject matter and function (such as selecting
appropriate BMPs, hazardous waste management, landscaping, and automotive
industry). This is not an inclusive list of sources of assistance but should provide a
jump start on locating information.
In addition, a quick -reference phone list is included at the end of the chapter.
There are a variety of organizations and programs that can offer technical assistance
in selecting and implementing BMPs. These sources of information and assistance
range from local and regional programs to state and federal agencies. Governmental
entities as well as private sector associations are available to provide suggestions and
guidance regarding the most effective and appropriate measures to take in order to
protect King County's valuable water resources. For best results, local organizations
or programs should be contacted before federal or state agencies are consulted. This
section provides names, contact information, and brief descriptions of several
sources of information and assistance available to the businesses and residents of
unincorporated King County_
In addition to the personal assistance offered by many organizations and programs,
there is also a broad range of written materials available to help businesses and
residents select, design, and understand applicable BMPs for water quality
protection. Many of these can be obtained free of charge from local associations or
governmental agencies. This section also provides information regarding several
publications, manuals, books, and newsletters that can help in the formation of
January 2009 King County Stormwater Pollution Prevention Manual
pollution prevention strategies to protect King County's water quality.
GENERAL BMP SELECTION
King County Water and Land Resources Division
The Water and Land Resources Division has water quality engineers available to
provide free on-site consultations to businesses and residents for assistance in
implementing the water quality BMPs in this manual.
For information, or to request an on-site consultation, contact.
King County Water and Land Resources Division
201 South Jackson, Suite 600
Seattle, WA 98104
Telephone: (206) 296-1900
Web site: http://www.kingeounty.gov/environment/waterandland/stormwater
King Conservation District
The King Conservation District can provide technical assistance for a variety of
stormwater pollution control efforts related to residences, small businesses, commercial
farms, and hobby farms. Advice is available on effective erosion control practices and
methods for specific site conditions, including stream bank stabilization and slope
stabilization techniques_ The Conservation District also has experience in controlling
water quality problems on commercial and hobby farms. Personnel are available for site
visits and can assist in effective stormwater pollution prevention planning for individual
sites. The Conservation District can prepare farm management plans to assist in
compliance with King County Code 9.12, Water Quality. The Conservation District
does not assist with BMP implementation on large business sites (such as malls) or
industrial sites.
For information, contact:
King Conservation District
935 Powell Avenue SW
Renton, WA 98055
Telephone: (206) 764-3410
Trade/Business Associations
Local trade or business associations can be valuable sources of information for specific
BMP applications on a business property. Many trade and business associations have
developed pollution prevention information for the benefit of their members that is
unique to their specific types of operations. Contact the appropriate trade or business
association to obtain information, BMP assistance, and help in locating other businesses
that are working out similar problems_
January 2009 King County Stormwater Pollution Prevention Manual
SANITARY SEWER AGENCIES
King County Wastewater Division --Industrial Waste Program
The Industrial Waste Program provides information on what can be discharged to the
sanitary sewer and works with businesses to meet individual discharge requirements.
Industrial Waste can also assist with information for rerouting illicit storm sewer
connections to the sanitary sewer.
For information, contact
King County Industrial Waste Program
130 Nickerson Street, Suite 200
Seattle, WA 98109
Telephone: (206)263-3000
Web site: http://www.kingcounty.gov/industrialwaste
Local Sewer Agency
If you are not served by King County, contact your local sewer agency for information
on allowable discharges. The name of your local sewer agency is identified on your
water and sewer bill.
HAZARDOUS WASTE MANAGEMENT
The Business Waste Line — (206) 296-3976
The Business Waste Line has staff to answer questions from small businesses about
hazardous waste. The Waste Line staff make referrals to other agencies and vendors and
send out printed materials. The Waste Line may also be used to report complaints and
hazardous waste violations. Calls are anonymous if requested.
For information, contact.-
The
ontact:The Business Waste Line Telephone: (206) 296-3976
Web site: http://www.goviink.org/hazwaste/
Hazardous Waste Library
The Hazardous Waste Library offers small businesses, citizens, agency staff, and local
officials one place to go for hazardous waste information. The library has a wealth of
onsite resources and is linked by computer to environmental information throughout the
world. Anyone in King County can request help in person or by phone. The library can
track down information, drawing on contacts in the community, government, trade
associations, various industries, and other libraries.
For information, contact.-
Seattle/King
ontact:Seattle/King County Hazardous Waste Library
130 Nickerson Street, Suite 100
January 2009 King County Stormwater Pollution Prevention Manual
Seattle, WA 98109
Telephone: (206) 263-3050
Web site: http://www.govlink.org/hazwaste/
Hazardous Waste: A Management Guide for Local Businesses
This booklet contains information to help businesses that generate small quantities of
hazardous waste understand and apply the laws that affect them. The guide includes
information on hazardous waste regulations, a service directory, and sources to contact
for more information.
To obtain a copy of this guide, contact.,
The Business Waste Line Telephone: (206) 296-3976
Hazardous Waste Onsite Consultation Program
The Onsite Consultation Program provides free onsite visits to businesses that request
assistance. Only small quantity waste generators or businesses that are potential small
quantity waste generators qualify for this service. Staff work with the business owner to
help develop a practical hazardous waste handling program, find alternatives, reduce
waste, and comply with regulations.
For information on the program or to request an onsite consultation, contact:
Seattle/King County Hazardous Waste Management Program
130 Nickerson Street, Suite 100
Seattle, WA 98109
206-263-3050
Web site: htip://www.goviink.org/hazwaste/
The Household Hazards Line (Household Hazardous Waste) —
(206) 296,4692
This telephone hot line provides hazardous waste information and referrals to the
general public. (Businesses should call the Business Waste Line, also listed in this
Reference Guide.) The Hazards Line tells citizens where to dispose of their hazardous
waste and suggests less hazardous alternatives. It also provides operations times and
locations for household disposal sites for King County and the City of Seattle_
For information, contact:
The Hazards Line Telephone: (206) 296-4692
Web site: http://www,govlink.org/hazwaste/house
Seattle -King County Department of Public Health Waste Characterization
This program serves businesses in Seattle and King County that have questionable
wastes. Information supplied by the generator on questionable wastes such as sludges,
sandblast waste, treated wood, and contaminated soils is reviewed by the Health
Department. Written authorizations are issued for those wastes that will be allowed in
January 2009 King County Stormwater Pollution Prevention Manual
the garbage.
For information, contact.,
Telephone: 206-296-4633
Washington Toxics Coalition
The Washington Toxics Coalition is a nonprofit organization dedicated to providing
information on reducing the use and production of toxic materials. The Coalition offers
fact sheets, research materials, and personal assistance to individuals interested in
reducing toxics (such as pesticides, solvents, cleaning chemicals, and a variety of other
chemicals) and finding safer alternatives to toxic materials.
For written information or personal assistance, contact:
Washington Toxics Coalition
4516 University Way NE
Seattle, WA 98105
Telephone: (206) 632-1545
Washington State Department of Ecology Dangerous Waste TSD
Information
The Department of Ecology is the source of information on businesses that provide
services in regard to dangerous waste treatment, storage, and disposal (TSD), and
information on applicable regulations for TSD businesses.
Contact:
Washington. State Department of Ecology
Telephone: (360) 407-6000 (Olympia), (425) 649-7000 (Bellevue)
Web site: http://www.ecy.wa.gov/programs/hwtr/
COMMERCIAL AND HOBBY FARMS
Washington State University Cooperative Extension—King County
The Extension Service offers a variety of educational services designed to promote
sensitivity to water quality concerns in land development planning. Extension staff have
expertise in several types of land uses, including agricultural production, livestock
management, small farms, forestry, gardening, lawn care, and others. Several programs
targeted at specific land use practices offer educational materials, workshops,
conferences, and individual consultation for landowners and land managers_ Although
the Extension Service cannot make individual site visits, staff can advise on effective
BMPs, supply supporting information, and contact information for other groups with
further information.
For information, contact:
WSU Cooperative Extension ----King County
January 2009 King County Stormwater Pollution Prevention Manual
919 SW Grady Way Ste 120
Renton, WA 98055
Telephone: (206) 205-3100 or (206) 296 -DIAL for prerecorded information on
hundreds of topics related to gardening, horticulture, and agriculture
Web site: http://king.wsu.edu/
King Conservation District
See earlier description.
LANDSCAPING NURSERY AND GOLF COURSE PRACTICES
University of Washington Center for Urban Horticulture
Elisabeth C. Miller Library
The Center for Urban Horticulture is a valuable resource for information on
environmentally sensitive gardening, landscaping, and nursery practices. The Center has
the only horticultural library in the Northwest, the Elisabeth C. Miller Library. Although
personnel are not available for answering individual questions on vegetation -related
BMPs, the library is open to the public for information that can assist in determining
effective BMP strategies.
Elisabeth C. Miller Library
3501 NE 41st Street
Seattle, WA 98195
For library hours, call: (206) 543-0415
Web site: http://www.millerlibrary.org
Golf Course Best Management Practice Manual
The King County Department of Development and Environmental Services has a BMP
manual specifically applicable to golf courses and their stormwater pollution concerns.
The Golf Course BMP Manual provides details on environmentally sound site planning
provisions, construction practices, vegetation planting and maintenance practices,
pesticide use, and general golf course maintenance practices. This manual should be
consulted for effective BMPs applicable to existing and proposed courses.
To obtain a copy of'the manual, contact:
King County Department of Development and Environmental Services—Resource
Planning Section at 206-296-6640 or King County Water and Land Resources Division
Telephone: (206) 296-6519
The Water Quality Action Manual for Greenhouse and Nursery Operators
This is a water quality protection guide for greenhouse and nursery growers that merges
pollution control and prevention, economics, worker safety, and public relations into
one easy -to -read manual. The American Association of Nurserymen, the Society of
January 2009 King County Stormwater Pollution Prevention Manual
American Florists, the Professional Plant Growers Association, and Roses, Inc
developed it.
To obtain a copy of this manual, contact:
AAN Publications
1250 1 Street NW, Suite 500
Washington, D.C. 20005
Telephone: (202) 789-2900
Web site: http://www.anla.org
Washington State University Cooperative Extension - King County
See earlier deseription.
LAND USE REQUIREMENTS
King County Department of Development and Environmental Services
The Department of Development and Environmental Services (DDES) should be
consulted to determine whether any permits may be required in constructing BMPs,
modifying property layout, or otherwise altering a site to control runoff contamination_
If permit requirements are overlooked or ignored, business or property owners may be
subject to fines. DDES should be contacted while plans are being formed for BMPs, and
before any action is taken, to determine permit applicability and potential fees.
For information, contact:
King County DDES
900 Oaksdale Ave SW Renton, WA 98055-1219
Telephone: (206) 296-6640
Web site: http://www.kingcounty.gov/property/permits
King County Fire Marshal
Questions on specific fire code requirements for individual site conditions and potential
BMP scenarios can be directed to the King County Fire Marshal's office.
For information, contact:
King County Fire Marshal
900 Oaksdale Ave Renton, WA 98055-1219
Telephone: (2.06) 296-6675
King County Critical Area Ordinance User's Manual
King County has enacted a Critical Areas Ordinance (CAO) to define and protect
certain land and water features throughout the county. The Environmental Education
Section of King County's Department of Development and Environmental Services
(DDES) has prepared a CAO User's Manual that serves as a reference for the CAO in
January 2009 King County 5tormwater Pollution Prevention Manual
an, easy -to -understand format. The CAO User's Manual can help determine special
considerations that may be necessary for implementation of BMPs within or near a
designated sensitive area. The King County Environmental Education Section also
offers training at the community level on sound development practices (including
BMPs) related to erosion control, clearing and grading, wildlife, and sensitive areas.
To obtain a copy of the CAO User's Manual, contact:
King County DDES
Environmental Education Section
900 Oaksdale Ave Renton, WA 98055-1219
Telephone: (206) 296-6640
EROSION CONTROL PRACTICES
Master Builders Association of King and Snohomish Counties
This is a business association primarily for residential construction companies.
Members have experience in applying erosion and sediment control BMPs on both
small and large sites. The association can provide references on erosion and sediment
control products for use on construction sites as well as material suppliers who carry
erosion and sediment control products.
For information, contact:
Master Builders Association
335 116`h Ave SE
Bellevue, WA 98004
Telephone: (425) 451-7920
Associated General Contractors
This association provides information and training on erosion and sediment control for
contractors and field staff. The Association also provides resources in the areas of waste
disposal and erosion/sediment control. It provides information on recommended water
quality protection methods for contractors who maintain equipment yards or are
involved in building construction or site preparation activities, such as clearing and
grading.
For information:
Associated General Contractors
1200 Westlake Avenue North, Suite 310
Seattle, WA 98109
Telephone: (206) 284-0061
Web site: httpJ/www.constructionfoundation.org
King County Surface Water Design Manual
This manual contains the requirements and standards for designing surface and
January 2009 King County Stormwater Pollution Prevention Manual
stormwater management systems in King County. It also includes a chapter on erosion
and sediment control requirements for permitted sites.
To obtain a copy of the manual, contact:
King County Water and Land Resources Division
201 South Jackson, Suite 600
Seattle, WA 98104
Telephone: (206) 296-6519
Web site: hqp://www.kin cog uM.gov/environment/waterandlan(/stormwater
Stormwater Management Manual for Western Washington
The Department of Ecology developed this manual as a model for local governments. It
contains requirements for stormwater management system design, erosion control, and
urban best management practices. Volume II discusses erosion and sediment control.
To obtain the manual, contact:
Publications Distribution Office
Washington State Department of Ecology
P.O. Box 47600
Olympia, WA 98504-7600
Telephone: (360) 407-7472
Order by title and publication number 91-75
King Conservation District
See earlier description.
RECYCLING AND REUSE PRACTICES
King County Solid Waste Division - Business Recycling Program
This program assists businesses with recycling by: 1) providing information on waste
reduction and recycling services for your particular needs; 2) helping you work with
your employees to promote participation; 3) offering information on buying recycled
products; and 4) providing you with ongoing support to ensure your program is
successful. The program also runs "GreenWorks" a special program that recognizes
individual business recycling efforts.
For more information, contact:
GreenWorks Waste Reduction and Recycling Program
King County Solid Waste Division
400 Yesler Way, Room 600
Seattle, WA 98104
Telephone: (206) 296-8800
January 2009 King County Stormwater Pollution Prevention Manual
The Guidebook for Implementing Curbside and Dropoff Used Oil
Collection Programs
Washington Citizens for Recycling, a nonprofit organization, has prepared this
guidebook for general public use to enhance used oil recycling efforts. Businesses
interested in recycling used oil can use this guidebook to determine how they can
recycle oil efficiently as well as how they can team with other businesses to form joint
oil recycling programs.
For information on obtaining the guidebook, contact:
Washington Citizens for Recycling
157 Yesler Way, Suite 309
Seattle, WA 98104
Industrial Materials Exchange (IMEX)
IMEX provides a free service helping businesses that have surplus materials find
businesses that need them. As an alternative to disposal, exchanges reduce disposal
costs for generators, enable secondary users to obtain useful materials at low cost (or no
cost), and reduce the amount of material that is permanently disposed. Surplus or waste
materials, such as solvents, paint, plastics, and wood, are exchanged. IMEX provides
this service through a bimonthly catalog, which is mailed to businesses in the region_
The catalog lists materials available and materials wanted. Materials are also listed on
the National Materials Exchange Network computer bulletin board (accessible by
computer modem). IMEX is a component of the Local Hazardous Waste Management
Program in King County, which is a multi -agency effort.
For information on the catalog or computer service, contact:
IMEX
Wells Fargo Center
999 3`d Ave Suite 700
Seattle, WA 98104
Telephone: (206) 296-4899
Washington State Department of Ecology Waste Reduction, Recycling,
and Litter Control Program
The Department of Ecology has extensive information on recycling, including details on
types of wastes that can be recycled, lists of commercial vendors that recycle certain
types of wastes, and locations of drop-off stations for recyclable materials.
SOLID WASTE DISPOSAL
King County Solid Waste Division
The Solid Waste Division can provide information on solid waste disposal issues.
January 2009 + King County Stormwater Pollution Prevention Manual
For questions on where to dispose of questionable solid waste, contact:
King County Solid Waste Division
General Information Telephone: (206) 296-6542
For information on the disposal of construction, demolition, and land clearing debris,
contact.,
Regional Disposal Telephone: (206) 646-2400
Seattle -King County Department of Public Health Waste Characterization
See earlier description.
BOAT AND MARINA PRACTICES
Northwest Marine Trade Association
The Northwest Marine Trade Association is a business organization with experience in
water pollution issues related to a variety of boat facilities. The association can offer
advice on BMPs as well as provide further contacts in the King County area for more
detailed information applicable to individual site conditions.
For information, contact:
Northwest Marine Trade Association
1900 North Northlake Way, Suite 233
Seattle, WA 98103-9087
Telephone: (206) 634-0911
AUTOMOTIVE INDUSTRY
Auto Industry Guides to Managing Hazardous Wastes
The Washington State Department of Ecology has published eight guides for the
automotive industry describing ways to manage hazardous wastes. These are small
individual guide books for the following auto service areas: radiator shops, transmission
shops, automotive machine shops, automotive repair shops, service stations, auto
dealers, tire dealers, and auto body shops.
To obtain a guide, contact.-
Publications
ontact:Publications Distribution Office
Washington State Department of Ecology
P_O. Box 47600
Olympia, WA 98504-7600
Telephone: (360) 407-7472
Order by title and publication number. You can also download publications and guides
from the Washington State Department of Ecology website at
January 2009 King County Stormwater Pollution Prevention Manual
http://www.ecy.wa.gov/biblio/automotive.htm].
A Water Quality Resource Manual for the Automotive Service Industry
This manual serves as an educational tool to facilitate compliance with water quality
regulations. The manual includes information on water quality problems and
regulations, guidance on how to develop shop -specific BMPs and policies, and case
studies on the problems and solutions of three repair shops in this region.
To obtain a copy of this manual, contact:
Puget Sound Alliance
130 Nickerson Street, Suite 107
Seattle, WA 98109
Telephone: (206) 286-1309
Vehicle Recycler Facilities
The Washington Department of Ecology has prepared a guidance document to assist
vehicle recyclers in selecting best management practices. The title is "Best Management
Practices to Prevent Stormwater Pollution at Vehicle Recycler Facilities."
To obtain the document, contact.
Publications Distribution Office
Washington State Department of Ecology
P.O. Box 47600
Olympia, WA 98504-7600
Telephone: (360) 407-7472
Order by title and publication number. You can also download publications and guides
from the Washington State Department of Ecology website at
http://www.ecy.wa.gov/biblio/automotive.htmi.
Also refer to the Hazardous Waste Management Section listed earlier.
SCRAP METAL INDUSTRY PRACTICES
Scrap Metal Recycling Environmental Guidance Manual
Pacific Iron and Metal has developed a guidance manual for metal recyclers that
suggests effective stormwater BMPs applicable in the metal recycling industry. The
guidance manual has been reviewed extensively by several interested agencies and
organizations in the Northwest, and it addresses regulatory issues in detail. The manual
includes lists of pollutants associated with various types of recyclable materials that are
likely to be encountered at typical metal recycling businesses. The guidance manual also
offers suggestions for recyclers seeking the assistance of an environmental consultant.
January 2009 Xing County Stormwater Pollution Prevention Manual
For information on the guidance manual, contact:
Pacific Iron and Metal Telephone: (206) 628-6222
or Metro Telephone: (206) 689-3000
LABOR SUPPORT FOR IMPLEMENTATION
Washington Conservation Corps
The Washington Conservation Corps is a group of citizens, ages 18-25, who can offer
free assistance on environmental cleanup projects such as stream restoration. A
supervisory board of representatives from the state departments of Ecology, Wildlife,
and Natural Resources oversees the Conservation Corps. The Conservation Corp's
efforts are not intended for private sites, but the group may offer assistance in
cooperative efforts by several businesses or residences to implement larger -scale BMPs
that will benefit particularly sensitive water resources. The Department of Ecology, the
Department of Wildlife, or the Department of Natural Resources must make a formal
request for Conservation Corps assistance. Consequently, outside requests for services
must be directed to one of these agencies.
For information, contact:
Washington Conservation Corps
P.O. Box 47600
Olympia, WA 98504-7600
Telephone: (360) 407-7248
Web site: httpJ/www_ecy.wa.gov/programs/sea/wee/
ACTIVITIES THAT MAY RESULT IN PROHIBITED DISCHARGES
According to King County Code 9.12.025B, the following activities may result in
prohibited discharges to the surface water, stormwater or groundwater. Each activity has
at least one activity sheet in this manual that describes the required best management
practices specific to that activity.
This list is not a complete list of potential prohibited discharges. For the complete list,
see the King County Code Title 9 for Surface Water Management at
http://www.kingeounty.gov/council/legislation/kc_code.aspx.
1. Potable water line flushing
Activi Sheet A-42 Potable Water Line Flushing or Tank Maintenance
2. Lawn watering with potable water
January 2009 King County Stormwater Pollution Prevention Manual
Activity Sheet A-26 Landscapiniz Activities
Activity Sheet R-5 Residential Gardeninj4 and Lawn Care
3. Dust control with potable water
Activity Sheet A-44 Dust Control and Soil Erosion and Sediment Control
4. Automobile and boat washing
Activity Sheet A-13 Vehicle Washing and Steam Cleaning
Activijy Sheet R-1 Residential Automobile and Boat Washin
5. Pavement and building washing
Activi1y Sheet A-15 Pressure Washing of Buildings, Rooftops, and other Large
Objects
Activity Sheet A-31 Vehicle and Equipment Parkin and Storage
Activity Sheet A-32 Sidewalk Maintenance
Activi Sheet R-6 Residential Maintenance and Re airs
6. Swimming pool and hot tub maintenance
Activi Sheet A-33 Swimmin Pool and S a Cleanin and Maintenance
Activijy Sheet R-7 Residential Swimming Pool and Hot Tub Maintenance
7_ Auto repair and maintenance
Activi Sheet A-18 Engine Re Maintenance
air and
Activijy Sheet R-3 Residential Automobile Repair and Maintenance
8. Building repair and maintenance
Activity Sheet A-29 Building Repair, Remodeling,and Construction
Activity Sheet R-6 Residential Maintenance and Re air
9. Landscape maintenance
Activi Sheet A-26 Landscaping Activities
Activi1y Sheet R-5 Residential Gardening and Lawn Care
January 2009 King County Stormwater Pollution Prevention Manual
10. Hazardous waste handling
Activity
Sheet A-2 Storage
of Liquid Materials in Stationary Tanks
Activity
Sheet A-3 Storage
of Liquid Materials in Portable Containers
Activity
Sheet A-5 Storage
of Pesticides and Fertilizers
Activijy
Sheet A-6 Stora
a and Treatment of Contaminated Soils
ActivitySheet
R-4 Residential Hazardous Waste Use, Storage and Disposal
11. Solid and food waste handling
Activity Sheet A-8 Storage of Solid Wastes and Food Wastes (includingcooking
rease
Activity Sheet A-9 Storage of Serap and Recycling Materials (including auto
recycling facilities)
Activity Sheet R-2 Residential Storage of Solid and Food Wastes
12. Application of pesticides
Activity Sheet A-25 Chemical Applications other than for Landscaping
Activity Sheet A-26 Landscaping Activities
Activity Sheet R-4 Residential Hazardous Waste Use. Storage and Disposal
Activity Sheet R-5 Residential Gardening and Lawn Care
January 2009 King County Stormwater Pollution Prevention Manual
Cascadia Revolving Fund
King Conservation District
(206) 447-9226
(206) 764-3410
King County Department of Development and Environmental Services
Clearing and Grading (206) 296-6640
Environmental Services (206) 296-6640
Fire Marshal (206) 296-6675
Code Enforcement (206) 266-6680
Permits (206) 296-6600
King County Local Hazardous Waste Program (206) 263-3050
King County Solid Waste Division
General Information (206) 296-6542
Business Recycling Program (206) 296-8800
King County Water and Land Resources Division
Main Desk (206) 296-6519
To request a water quality audit (206) 296-1900
Master Builders Association (206) 451-7920
(425) 641-8093
Northwest Marine Trade Association (206) 634-0911
January 2009 King County Stormwater Pollution Prevention Manual
Pacific Northwest Pollution Prevention Research Center (206) 223-1151
Puget Sound Clean Air Agency (PSCAA) 1-800-552-3565
Seattle—King County Health Department
Information on septic tanks and garbage containers Contact District Office
Business Waste Line (206) 296-3976
Waste characterization service (206) 296-4633
Hazards Line (for households) (206) 296-4692
Industrial Materials Exchange (IMEX) (206) 296-4899
Pesticide applicator licensing (206) 205-4394
University of Washington Center for Urban Horticulture- (206) 543-8616
Elisabeth C. Miller Library
Washington State Department of Ecology
Northwest Regional Office (Bellevue) (425) 649-7000
Waste reduction and recycling 1 -800 -RECYCLE
Reporting of Spills (425) 649-7000
Washington Conservation Corps (360) 407-7248
Publications Distribution Office (360) 407-7472
Washington State Department of Natural Resources (206) 825-1631
Washington State University Cooperative Extension - King (206) 205-3100
County
206-296-3440
Master Gardener Hotline
or for prerecorded information
Washington Toxics Coalition
January 2009
(206) 296 -DIAL (3425)
(206) 632-1545
Jong County Stormwater Pollution Prevention Manual
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City of,�`�
'r -R11
NOTICE
OF ENVIRONMENTAL DETERMINATION
ISSUANCE OF A DETERMINATION OF NON -SIGNIFICANCE (DNS)
POSTED TO NOTIFY INTERESTED PERSONS OF AN ENVIRONMENTAL ACTION
PROJECT NAME: 2009 City of Renton Surface water Design Manual
PROJECT NUM13ER: WA09.061, ECF
LOCATION: Citywide
DESCRIPTION: The applicant requested Non -project SEPA Review of a new City of Renton
Surface Water Design Manual. The Manual would consist of the 2009 King County Surface Water Design Manual
and Amendments specific to the City of Renton. The of would contain standards to control peak rate
discharge, duration and quality of runoff from all new development. redevelopment and construction sites The
inlent of the revised stormwater standards is to provide hatter protection of environmental resources and
reduce Flooding within the City
THE CITY OF RENTON ENVIRONMENTAL REVIEW COMMITTEE {El HAS DETERMINED THAT
THE PROPOSED ACTION DOES NOT HAVE A SIGNIFICANT ADVERSE IMPACT ON THE
ENVIRONMENT.
Appeals of the environmental determination must be filed in writing on or before 5:00 PM on July 10, 2009- Appeals
must be filed in writing together with the required $75.00 application fee with: Hearing Examiner, City of Renton,
1055 South Grady Way. Renton, WA 98057. Appeals to the Examiner are governed by City of Renton Municipal Code
Section 4.6-110.13. Additional Information regarding the appeal process may be obtained from the Renton City
Clerk -s Office, 14251430-6510,
IF THE ENVIRONMENTAL DETERMINATION IS APPEALED, A PUBLIC HEARING WILL BE SET AND
ALL PARTIES NOTIFIED.
FOR FURTHER INFORMATION, PLEASE CONTACT THE CITY OF RENTON, DEPARTMENT OF
COMMUNITY & ECONOMIC DEVELOPMENT Al (425} 430-7200.
DO NOT REMOVE THIS NOTICE WITHOUT PROPER AUTHORIZATION
Please Include the project NUMBER when calling for proper file identification.
CERTIFICATION
Cwa hereby certify that copies of the above
were posted by me in conspicuous places or neodescribed prod
DATE: r SIGNS
ATTEST: Subscribed and sworn before fne, a Notary Public, in and for (lie Statof Washington residing
:X±.L on the day of
NOTARY PUBLIC SI
"4.
ATTEST:
f }r
Fiy�
, Ch
e -
CITY OF RENTON
DEPARTMENT OF COMMUNITY & ECONOMIC DEVELOPMENT - PLANNING DIVISION
AFFIDAVIT OF SERVICE BY MAILING
On the 25th day of June, 2009, 1 deposited in the mails of the United States, a sealed envelope
containing ERC Determination documents. This information was sent to:
Name
Representing
Agencies
See Attached
Allen Quynn - City of Renton
Contact/Applicant/Owner
(Signature of Sender):
STATE OF WASHINGTON ) -
SS
COUNTY OF KING )
I certify that I know or have satisfactory evidence that Stacy Tucker
signed this instrument and acknowledged it to be his/her/their free and voluntary act for the uses and
purposes mentioned in the instrument.
Dated: L - DU b9
Notary (Print):
My appointment expires:
Project Name: 2009 City of Renton Surface Water Design Manual
Project Number: I_UA09-061, ECF
template - affidavit of service by mailing
'0 �.
AGENCY (DOE) LETTER MAILING
(ERC DETERMINATIONS)
Dept. of Ecology *
WDFW - Larry Fisher*
Muckleshoot Indian Tribe Fisheries Dept.
Environmental Review Section
1775 12th Ave. NW Suite 201
Attn: Karen Walter or SEPA Reviewer
PO Box 47703
Issaquah, WA 98027
39015-172 n" Avenue SE
Olympia, WA 98504-7703
Auburn, WA 98092
WSDOT Northwest Region
Duwamish Tribal Office'
Muckleshoot Cultural Resources Program
Attn: Ramin Pazooki
4717 W Marginal Way SW
Attn: Ms Melissa Calvert
King Area Dev, Serv., MS -240
Seattle, WA 98106-1514
39015 172"d Avenue SE
PO Box 330310
Auburn, WA 98092-9763
Seattle, WA 98133-9710
DS Army Corp_ of Engineers *
KC Wastewater Treatment Division *
Office of Archaeology & Historic
Seattle District Office
Environmental Planning Supervisor
Preservation*
Attn: SEPA Reviewer
Ms, Shirley Marroquin
Attn: Gretchen Kaehler
PO Box C-3755
201 S. Jackson ST, MS KSC-NR-050
PO Box 48343
Seattle, WA 98124
Seattle, WA 98104-3855
Olympia, WA 98504-8343
Boyd Powers
Depart. of Natural Resources
PO Sox 47015
Olympia, WA 98504-7015
KC Dev. & Environmental Serv.
City of Newcastle
City of Kent
Attn: SEPA Section
Attn- Steve Roberge
Attn: Mr. Fred Satterstrom, AICP
900 Oakesdale Ave. SW
Director of Community Development
Acting Community Dev. Director
Renton, WA 98055-1219
13020 Newcastle Way
220 Fourth Avenue South
Newcastle, WA 98059
Kent, WA 98032-5895
Metro Transit
Puget Sound Energy
City of Tukwila
Senior Environmental Planner
Municipal Liaison Manager
Steve Lancaster, Responsible Official
Gary Kriedt
.foe Jainga
6200 Southcenter Blvd.
201 South Jackson Street KSC-TR-0431
PO Box 90868, MS: XRD-01 W
Tukwila, WA 98188
Seattle, WA 98104-3856
Bellevue, WA 98009-0868
Seattle Public Utilities
Real Estate Services
Attn: SEPA Coordinator
700 Fifth Avenue, Suite 4900
PO Box 34018
Seattle, WA 98124-4018
*Note: If the Notice of Application states that it is an "Optional DNS", the marked agencies and
cities will need to be sent a copy of the checklist, Site Pian PMT, and the notice of application.
template - affidavit of service by mailing
City of
,
OF ENVIRONMENTAL DETERMINATION
ISSUANCE OF A DETERMINATION OF NON -SIGNIFICANCE (DNS)
POSTED TO NOTIFY INTERESTED PERSONS OF AN ENVIRONMENTAL ACTION
PROJECT NAME: 2009 City of Renton Surface Water Design Manual
PROJECT NUMBER: LUA09-061, ECF
LOCATION: Citywide
DESCRIPTION: The applicant requested Non -project SEPA Review of a new City of Renton
Surface Water Design Manual. The Manual would consist of the 2009 King County Surface Water Design Manual
and Amendments specific to the City of Renton. The Manual would contain standards to control peak rate
discharge, duration and quality of runoff from all new development, redevelopment and construction sites. The
intent of the revised stormwater standards is to provide better protection of environmental resources and
reduce flooding within the City
THE CITY OF RENTON ENVIRONMENTAL REVIEW COMMITTEE (ERC) HAS DETERMINED THAT
THE PROPOSED ACTION DOES NOT HAVE A SIGNIFICANT ADVERSE IMPACT ON THE
ENVIRONMENT.
Appeals of the environmental determination must be filed in writing on or before 5:00 PM on July 10, 2009. Appeals
must be filed in writing together with the required $75.00 application fee with: Hearing Examiner, City of Renton,
1055 South Grady Way, Renton, WA 98057. Appeals to the Examiner are governed by City of Renton Municipal Code
Section 4-8-110.B. Additional information regarding the appeal process may be obtained from the Renton City
Clerk's Office, (425) 430-6510.
IF THE ENVIRONMENTAL DETERMINATION IS APPEALED, A PUBLIC HEARING WILL BE SET AND
ALL PARTIES NOTIFIED.
FOR FURTHER INFORMATION, PLEASE CONTACT THE CITY OF RENTON, DEPARTMENT OF
COMMUNITY & ECONOMIC DEVELOPMENT AT (425) 430-7200.
DO NOT REMOVE THIS NOTICE WITHOUT PROPER AUTHORIZATION
Please include the project NUMBER when calling for proper file identification.
DEPARTMENT OF COMMUNITY o Cit °f '=
AND ECONOMIC DEVELOPMENT u1
M E M O R A N D U M
DATE: June 25, 2009
TO: Allen Quynn, Utility Systems
FROM: Gerald C. Wasser, Planning Division
SUBJECT: ENVIRONMENTAL (SEPA) THRESHOLD DETERMINATION
2009 City Of Renton Surface Water Design Manual
LUA09-061, ECF
This memo is written on behalf of the Environmental Review Committee (ERC) and is to
inform you that they have completed their review of the environmental impacts of the
above -referenced project. The Committee, on June 22, 2009, decided that your project
will be issued a Determination of Non -Significance.
The Committee has determined that it does not have a probable significant adverse
impact on the environment and an Environmental Impact Statement (EIS) is not
required under RCW 43.21C.030(2)(c). Attached for your review is a copy of the ERC
Report.
Appeals of the environmental determination must be filed in writing on or before 5:00
p.m. on July 10, 2009. If the Environmental Determination is appealed, a public hearing
date will be set and all parties notified. If you have any questions or desire clarification
of the above, please call me at 430-7382.
Attachment
ERC Determination Memo 09-061.doc
City of c} . ,
DEPARTMENT OF COMMUNITY D O �rti -; ,,
AND ECONOMIC DEVELOPMENT
C
ENVIRONMENTAL (SEPA) DETERMINATION
OF NON -SIGNIFICANCE (DNS)
APPLICATION NUMBER: LUA09-061, ECF
APPLICANT: Allen Quynn, City of Renton
PROJECT NAME: 2009 City of Renton Surface Water Design Manual
DESCRIPTION OF PROPOSAL: The applicant is requesting a non -project Environmental (SEPA)
Review of a new City of Renton Surface Water Design Manual that would apply to new development,
redevelopment and construction sites in the City of Renton. The new manual would be equivalent to
the minimum technical requirements, thresholds and definitions in Appendix I of the Washington
Department of Ecology's Phase 11 National Pollution Discharge Elimination System (NPDES) Municipal
Stromwater Permit for Western Washington. In order to meet these standards, the City proposes to
amend the Renton Municipal Code by adopting the 2009 King County Surface Water Design Manual
(KCSWDM) with City addendums containing specific requirements and procedures applicable to the
City. Most changes to the 2009 KCSWDM are minor; however, the Renton Surface Water Design
Manual would apply different flow standards in certain areas of the City that meet the minimum
requirements in the permit provided they are approved by the Department of Ecology.
LOCATION OF PROPOSAL: Citywide
LEAD AGENCY: City of Renton
Environmental Review Committee
Department of Community & Economic Development
This Determination of Non -Significance is issued under WAC 197-11-340. Because other agencies of
jurisdiction may be involved, the lead agency will not act on this proposal for fourteen (14) days.
Appeals of the environmental determination must be filed in writin on or before 5:00 p.m. on July 10,
2009. Appeals must be filed in writing together with the required 175.00 application fee with: Hearing
Examiner, City of Renton, 1055 South Grady Way, Renton, WA 98057. Appeals to the Examiner are governed
by City of Renton Municipal Code Section 4-8-110.B. Additional information regarding the appeal process
may be obtained from the Renton City Clerk's Office, (425) 430-6510.
PUBLICATION DATE:
DATE OF DECISION:
SIGNATURES:
ld(6�xll 4c)
Gregg immerman, Administrator
Public Works Department
Terry Higashiyama, Administrator
Community Services Department
June 26, 2009
June 22, 2009
-61- 0 z z A�
Date . Davi Daniels, Administrator Date
Fire & Emergency Services
Date AlexlPietscH, Ad inistrator Date
Department of Community &
Economic Development
SDrinabrook Ridae PUD (Dofbee
LUA09-024, ECF, V -H, PPUD, LLA
Location: SE 172nd Street & Benson Road S & Benson Drive. The applicant is requesting an Environmental
Review (SEPA) and Preliminary Planned Urban Development (PPUD) for a mixed-use development including
office, retail and residential uses. In addition, the applicant has requested a Lot Line Adjustment and a
Hearing Examiner Variance from RMC 4-4-130 to allow the removal of trees in a stream buffer. The subject
site is located south of SE 172nd Street, west of Benson Road South and east of Benson Drive South (SR 515).
The site is comprised of two vacant parcels totaling 164,828 square feet (3.78 acres) located within the
Commercial Arterial (CA) zone. The proposed lot line adjustment would create two parcels, Lot 1 that would
be 1.98 acres and Lot 2 that would be 1.80 acres. The applicant has proposed a 4 -story, 97 -unit multi -family
complex on Lot 1 which would have a density of 50.30 dwelling units per acre. Lot 2 would be developed with
a 3 -story mixed-use building with retail on the ground floor and office above. Access to the site would be
gained from SE 172nd Street, Benson Drive South and Benson Road South. One access point and an interal
drive aisle crosses over the Class 4 stream located on site. The site contains Coal Mine Hazards, Steep Slopes
and a Class 4 Stream. The applicant has proposed to retain 12 significant trees on the subject site.
Hawk's Landina Mixed Use (Doibee
LUA09-060, ECF, SA -M, SA -H
Location: 4350 Lake Washington Blvd N. The applicant is requesting Master Site Plan Review, Site Plan
Review, and SEPA Environmental Review for a 5 -story, 60 -foot high, 122,000 square foot, 173 -roam hotel. The
hotel would include retail space, fitness center, spa, and a restaurant. The subject site is located at 4350 Lake
Washington Boulevard N, the former site of Pan Abode Cedar Homes that is approximately 7.8 acres in size, of
which 3.07 acres would be developed with the proposed hotel. The applicant has proposed to remove the
existing, 75,214 square feet, of warehouse structures on the subject site. The proposed development would
be accessed from Lake Washington Boulevard North at two locations. In addition to structured parking below
the hotel, 124 surface parking spaces are proposed including five spaces for Neighborhood Electric Vehicles.
The subject site is located north of May Creek and its associated 100 -year floodplain and has been identified to
be within a seismic hazard area. The applicant estimated 4,450 cubic yards of cut and 15,000 cubic yards of fill
material for development construction. The 32 existing trees on the subject site would be replaced with 83
new trees. The applicant would provide drainage and street frontage improvements as a part of this project.
ENVIRONMENTAL REVIEW COMMITTEE
MEETING NOTICE
June 22, 2009
To:
Gregg Zimmerman, Public Works Administrator
Terry Higashiyama, Community Services Administrator
1. David Daniels, Fire & Emergency Services, Administrator
Alex Pietsch, CED Administrator
From:
Jennifer Henning, CED Planning Manager
Meeting Date:
Monday, June 22, 2009
Time:
3:00 PM
Location:
Sixth Floor Conference Room #620
Agenda listed below.
SDrinabrook Ridae PUD (Dofbee
LUA09-024, ECF, V -H, PPUD, LLA
Location: SE 172nd Street & Benson Road S & Benson Drive. The applicant is requesting an Environmental
Review (SEPA) and Preliminary Planned Urban Development (PPUD) for a mixed-use development including
office, retail and residential uses. In addition, the applicant has requested a Lot Line Adjustment and a
Hearing Examiner Variance from RMC 4-4-130 to allow the removal of trees in a stream buffer. The subject
site is located south of SE 172nd Street, west of Benson Road South and east of Benson Drive South (SR 515).
The site is comprised of two vacant parcels totaling 164,828 square feet (3.78 acres) located within the
Commercial Arterial (CA) zone. The proposed lot line adjustment would create two parcels, Lot 1 that would
be 1.98 acres and Lot 2 that would be 1.80 acres. The applicant has proposed a 4 -story, 97 -unit multi -family
complex on Lot 1 which would have a density of 50.30 dwelling units per acre. Lot 2 would be developed with
a 3 -story mixed-use building with retail on the ground floor and office above. Access to the site would be
gained from SE 172nd Street, Benson Drive South and Benson Road South. One access point and an interal
drive aisle crosses over the Class 4 stream located on site. The site contains Coal Mine Hazards, Steep Slopes
and a Class 4 Stream. The applicant has proposed to retain 12 significant trees on the subject site.
Hawk's Landina Mixed Use (Doibee
LUA09-060, ECF, SA -M, SA -H
Location: 4350 Lake Washington Blvd N. The applicant is requesting Master Site Plan Review, Site Plan
Review, and SEPA Environmental Review for a 5 -story, 60 -foot high, 122,000 square foot, 173 -roam hotel. The
hotel would include retail space, fitness center, spa, and a restaurant. The subject site is located at 4350 Lake
Washington Boulevard N, the former site of Pan Abode Cedar Homes that is approximately 7.8 acres in size, of
which 3.07 acres would be developed with the proposed hotel. The applicant has proposed to remove the
existing, 75,214 square feet, of warehouse structures on the subject site. The proposed development would
be accessed from Lake Washington Boulevard North at two locations. In addition to structured parking below
the hotel, 124 surface parking spaces are proposed including five spaces for Neighborhood Electric Vehicles.
The subject site is located north of May Creek and its associated 100 -year floodplain and has been identified to
be within a seismic hazard area. The applicant estimated 4,450 cubic yards of cut and 15,000 cubic yards of fill
material for development construction. The 32 existing trees on the subject site would be replaced with 83
new trees. The applicant would provide drainage and street frontage improvements as a part of this project.
ENVIRONMENTAL REVIEW COMMITTEE
Meeting Notice
June 22, 2009
Page 2 of 2
2009 City of Renton Surface Wafer Design_ Manual _ (Wasserl
LUA09-061, ECF
Location: Citywide. The applicant is requesting a non -project Environmental (SEPA) Review of a new City of
Renton Surface Water Design Manual that would apply to new development, redevelopment and construction
sites in the City of Renton. The new manual would be equivalent to the minimum technical requirements,
thresholds and definitions in Appendix I of the Washington Department of Ecology's Phase II National
Pollution Discharge Elimination System (NPDES) Municipal Stromwater Permit for Western Washington. In
order to meet these standards, the City proposes to amend the Renton Municipal Code by adopting the 2009
King County Surface Water Design Manual (KCSWDM) with City addendums containing specific requirements
and procedures applicable to the City. Most changes to the 2009 KCSWDM are minor; however, the Menton
Surface Water Design Manual would apply different flow standards in certain areas of the City that meet the
minimum requirements in the permit provided they are approved by the Department of Ecology.
cc: D. Law, Mayor
J. Covington, Chief Administrative Officer
S. Dale Estey, CED Director
D. Pargas, Assistant Fire Marshall
N, Watts, Development Services Director
F. Kaufman, Hearing Examiner
W_ Flora, Deputy Chief/Fire Marshal
J. Medzegian, Council
P. Hahn, Transportation Systems Director
C. Vincent, CED Planning Director 13'
L. Warren, City Attorney 0
ERC City of Renton
Department of Community and Economic Development
REPORT
ENVIRONMENTAL REVIEW COMMITTEE REPORT
ERC MEETING DATE:
lune 22, 2009
Project Name:
2009 City of Renton Surface Water Design Manual
Owner:
City of Renton
Applicant:
Allen Quynn
City of Renton
1055 South Grady Way
Renton, WA 98057
Contact:
Same as Applicant
Fife Number:
LUA09-061, ECF
Project Manager:
Gerald Wasser, Associate Planner
Project Summary:
The applicant is requesting a non -project Environmental (SEPA) Review of a
new City of Renton Surface Water Design Manual that would apply to new
development, redevelopment and construction sites in the City of Renton.
The new manual would be equivalent to the minimum technical
requirements, thresholds and definitions in Appendix I of the Washington
Department of Ecology's Phase II National Pollution Discharge Elimination
System (NPDES) Municipal Stromwater Permit for Western Washington. In
order to meet these standards, the City proposes to amend the Renton
Municipal Code by adopting the 2009 King County Surface Water Design
Manual (KCSWDM) with City addendums containing specific requirements
and procedures applicable to the City. Most changes to the 2009 KCSWDM
are minor; however, the Renton Surface Water Design Manual would apply
different flow standards in certain areas of the City that meet the minimum
requirements in the permit provided they are approved by the Department
of Ecology.
Project Location:
Entire Renton Sewer Service Area
Exist. Bldg. Area SF:
N/A Proposed New Bldg. Area N/A
(footprint): N/A
Proposed New Bldg. Area (gross):
Site Area:
N/A Total Building Area GSF: N/A
STAFF
Staff Recommends that the Environmental Review Committee issue a
RECOMMENDATION:
Determination of Non -Significance (DNS).
The proposal consists of revising the City's surface water design standards for new development,
redevelopment and construction sites. To accomplish this the City is proposing that a 2009 City of
Renton Surface Water Design Manual (SWDM) be adopted. The 2009 City of Renton SWDM would
ERC REPORT 09-061.doc
City of'Renton Department gf'C'om Ity & Economic Development Er vnental Review Com mitlee Deport
2009 SURFACE WATER DESIGN MA.N uAL LUA09-061, ECF
[deport of June 22, 2009 Page 2 of 4
consist of both the 2009 King County Surface Water Design Manual and a City of Renton Addendum
which would be used for guidance in drainage review and design of stormwater facilities within the
City of Renton.
The adoption of the 2009 City of Renton Surface Water Design Manual would provide compliance with
new federal stormwater regulations under the National Pollution Discharge Elimination System
(NPDES). Phase I of the NPDES established regulations for permit application requirements for
stormwater discharges associated with industrial activity; discharges from a municipal separate storm
water sewer system serving a population of 250,000 or more; and discharges from municipal separate
storm sewer systems serving populations between 100,000 and 250,000. Phase II of the NPDES
extends regulations to smaller municipal separate storm systems which were not covered under Phase
I including urbanized areas of the State of Washington. Phase II jurisdictions include those that: own
and operate a storm drain system; discharge to surface waters; are located in urbanized areas; and
have a population greater than 1,000. The City of Renton is included in these Phase II jurisdictions.
The 2009 City of Renton Surface Water Design Manual would contain standards to control peak rate
discharge, duration and quality of runoff from all new development, redevelopment and construction
sites. The intent of the revised stormwater standards is to provide better protection of environmental
resources and reduce flooding within the City.
This environmental review does not address specific projects. Rather, this is a programmatic review
and does not address site-specific conditions. Such conditions and any associated impacts would be
addressed during the Environmental (SEPA) Reviews of each project.
PART TWO: ENVIRONMENTAL REVIEW
In compliance with RCW 43.21C.240, the following Environmental (SEPA) Review addresses only those
project impacts that are not adequately addressed under existing development standards and
environmental regulations.
A. Environmental Threshold Recommendation
Based on analysis of probable impacts from the proposal, staff recommends that the Responsible
Officials:
Issue a DNS with a 14 -day Appeal Period.
B. Exhibits
Exhibit 1 2009 City of Renton Surface Water Design Manual, Preface
Exhibit 2 2009 City of Renton Surface Water Design Manual, Chapter 1
C. Environmental Impacts
The Proposal was circulated and reviewed by various City Departments and Divisions to determine
whether the applicant has adequately identified and addressed environmental impacts anticipated
to occur in conjunction with the proposed development. Staff reviewers have identified that the
proposal is likely to have no probable impacts.
ERC REPORT09-061,doc
City of Renton Depurlmenl of Com '1y & Economic Development Er imental Review Committee Report
2009 SURFACF_ fVATER DESIGN dfAN,AL LUA04-061, ECF
Report of June 22, 2009 Page 3 of 4
As this proposal is a non -project action, an evaluation of environmental impacts of the 2009 City of
Renton Surface Water Design Manual is subject to the criteria indicated below. Each of the
development, redevelopment and construction projects subject to the standards contained in the
SWDM will be subject to SEPA regulations. Depending on the scope of the project, each would
require a separate environmental checklist and threshold determination which would be
completed as specific projects are proposed for construction.
L Is the proposal likely to increase discharge to water; emissions to air; production, storage or
release of toxic or hazardous substances; or production of noise?
No adverse impacts to water or air would likely occur; no storage or release of toxic or
hazardous substances would likely occur; and no noise would likely be generated by this non -
project action. However, a decrease in the rate of stormwater runoff from development
projects and a reduction in pollutants discharged to water bodies may result.
2. How would the proposal be likely to affect plants, animals, fish or marine life?
No adverse impacts to plants, animals, fish or marine life would likely occur as a result of this
non -project action. The proposal may increase the protection of plants, animals, fish and
marine life by providing standards which better control runoff which may reduce erosion and
associated pollutants to natural receiving waters.
3. How would the proposal be likely to deplete energy or natural resources?
No significant adverse impacts to energy or natural resources would likely occur as a result of
this non -project action.
4. How would the proposal be likely to use or affect environmentally sensitive areas or areas
designated (or eligible or under study) for governmental protection such as parks,
wilderness, wild and scenic rivers, threatened or endangered species habitat, historic or
cultural sites, wetlands, floodplains or prime farmlands?
No environmentally sensitive areas or areas designated for governmental protection would
likely be affected adversely by this non -project action.
5. How would the proposal be likely to affect land and shoreline use, including whether it
would allow or encourage land or shoreline uses incompatible with existing plans?
No impacts to land or shoreline use would likely occur as a result of this non -project action.
6. How would the proposal be likely to increase demands on transportation or public services
and utilities?
No impacts to transportation or public services would likely occur as a result of this non -
project action.
7. Would the proposal conflict with local, state or federal laws or requirements for the
protection of the environment?
The proposal would not likely conflict with other local, state or federal laws or requirements
for the protection of the environment. The proposal is in compliance with federal stromwater
regulations under Phase II of the National Pollution Discharge Elimination System.
ERC REPORT D9-061. doe
D. Comments of Reviewing Departments
The proposal has been circulated to City Department and Division Reviewers. Where applicable,
their comments have been incorporated into the text of this report and/or "Advisory Notes to
Applicant."
✓ Copies of all Review Comments are contained in the Official File and may be attached to
this report.
Environmental Determination Appeal Process: Appeals of the environmental determination must
be filed in writing on or before 5:00 PM, July 10, 2009.
Renton Municipal Code Section 4-8-110.8 governs appeals to the Hearing Examiner. Appeals must be
filed in writing at the City Clerk's office along with a $75.00 application fee. Additional information
regarding the appeal process may be obtained from the City Clerk's Office, Renton City Hall - 7th Floor,
1055 S, Grady Way, Renton WA 98057.
ADVISORY NOTES TO APPLICANT
The following notes are supplemental information provided in conjunction with the administrative
land use action. Because these notes are provided as information only, they are not subject to the
appeal process for the land use actions.
None
ERC REPORT 09-061.doc
CITY OF RENTON
STORMWATER DESIGN MANUAL UPDATE
DRAFT
EXHIBIT 1
PREFACE - HOW TO USE THIS DOCUMENT
GENERAL INTRODUCTION
The City of Renton has adopted the 2009 King County Surface Water Desi n Manual
(KCSWDM) and this Addendum to the KCSWDM (Addendum), effective .ti ,
2009. The KCSWDM along with the Addendum applies to development proposals
within the City of Renton and is to be used for guidance for drainage review and
design of stormwater facilities within the City. The Addendum outlines all changes,
additions, and deletions to the KCSWDM.
PURPOSE AND NEED OF THIS DOCUMENT
The City's adoption of the KCSWDM and accompanying Addendum was the
method used by the City to comply with new federal stormwater regulations. More
specifically, Phase I of the National Pollutant Discharge Elimination System
(NPDES) establishes regulations sets forth in the permit application requirements for
stormwater discharges associated with industrial activity; discharges from a
municipal separate storm sewer systems serving a population of 250,000 or more;
and discharges from municipal separate storm sewer systems (MS4s) serving a
population between 100,000 to 250,000.
The Phase lI rule extends coverage of the National Pollutant Discharge Elimination
System (NPDES) program to certain "small" MS4s. The Phase II permit covers
certain urbanized areas of Washington State that were previously not covered under
Phase I. Phase II communities are identified under the rules as jurisdictions that:
1_ Own and operate a storm drain system;
2. Discharge to surface waters;
3. Are located in urbanized areas, and
4. Have a population greater than 1,000.
With a 2000 census population of approximately just over 50,052, the City of Renton
falls under the jurisdiction of Phase II requirements.
Washington State's Department of Ecology (Ecology), who oversees stormwater
requirements in the state, has developed the 2005 Stormznater Management Manual for
Western Washingfori (Ecology Manual) which complies with the NPDES stormwater
discharge requirements. In addition, Ecology has approved the 2009 KCSWDM as
equivalent to the Ecology Manual_
CITY OF RENTON DRAFT STORIVVVATER DESIGN MANUAL UPDATE
PREFACE SEPA PAGE 1 OF 7
PRINTED: 6i512009, 2:53:24 PM
CITY OF RENTON STORMWATER DESIGN MANUAL UPDATE -DRAFT
The new surface water standards outlined in these manuals will generally increase
flow control requirements, especially for redevelopment projects and will also
increase water quality treatment volumes over the previously required standards.
The new standards are more protective of receiving waters and will be more
aggressive in reducing flooding and minimizing impacts to water quality and
aquatic habitat in the City.
HOW TO USE THIS DOCUMENT
This document shall be used in coordination with the 2009 KCSWDM for the
following:
To translate specific wording or reference from King County to the City.
■ To cross reference City ordinances and City maps in lieu of King County
ordinances and maps.
■ To provide a linkage or reference to other City requirements such as more
restrictive requirements outlined in the City's Aquifer Protection Ordinances.
■ To provide exceptions, modifications and additions to the KCSWDM.
The KCSWDM will be used in its entirety except as outlined in this document.
Exceptions, modifications and additions to the KCSWDM will be organized and
referenced by chapter and section in the same manner as the KCSWDM. Some
global changes will also be applied throughout the entire KCSWDM. The user shall
override the maps and references to other documents as indicated within this
Addendum.
ADDENDUM ORGANIZATION
The information presented in this addendum is organized as follows:
■ Preface - How to use this Document: This preface provides instruction for using
the City of Renton's addendum to the 2009 KCSWDM. It also defines terms in
the King County manual that are used differently for the City of Renton; City
departments that are equivalent to county departments referred to in the
KCSWDM; City ordinances that take the place of corresponding county
ordinances, and designations from the King County manual that do not apply to
proposals in the City of Renton.
CITY OF RENTON DRAFT STORMWATER DESIGN MANUAL UPDATE
PREFACE SERA PAGE 2 OF 7
CITY OF RENTON STGRMWATER DESIGN MANUAL UPDATE -DRAFT
■ Chapter 1 - Drainage Review Requirements: The City of Renton has made
several changes to Chapter 1 of the 2009 KCSWDM. This addendum to
Chapter 1 provides replacement text for the sections that are changed. Apart
from these changes, the King County version of Chapter 1 applies for proposals
in the City of Renton.
■ Chapter 2 - Drainage Plan Submittal: The City of Renton has made several
changes to Chapter 2 of the 2009 KCSWDM. This addendum to Chapter 2
provides replacement text for the sections that are changed. Apart from these
changes, the King County version of Chapter 2 applies for proposals in the City
of Renton.
■ Chapter 3 - Hydrologic Analysis and Design: The City of Renton has made
minor changes to Chapter 3 of the 2009 KCSWDM. This addendum to
Chapter 3 provides replacement text for the sections that are changed. Apart
from these changes, the King County version of Chapter 3 applies for proposals
in the City of Renton.
■ Chapter 4 - Drainage PIan Submittal: The City of Renton has made minor
changes to Chapter 4 of the 2009 KCSWDM. This addendum to Chapter 4
provides replacement text for the sections that are changed. Apart from these
changes, the King County version of Chapter 4 applies for proposals in the City
of Renton.
■ Chapter 5 - Conveyance System Analysis and Design: The City of Renton has
made minor changes to Chapter 5 of the 2009 KCSWDM. This addendum to
Chapter 5 provides replacement text for the sections that are changed. Apart
from these changes, the King County version of Chapter 5 applies for proposals
in the City of Renton.
■ Chapter 6 - Water Quality Design: The City of Renton has made minor
changes to Chapter 6 of the 2009 KCSWDM. This addendum to Chapter 6
provides replacement text for the sections that are changed. Apart from these
changes, the King County version of Chapter 6 applies for proposals in the City
of Renton.
■ APPENDICES: Appendix S does not apply to the City of Renton. King County
Appendices A, C, and D apply, as modified, to proposals in the City of Renton.
■ References: King County Reference Sections 1, 2, 3, 7, 9, and 10 do not apply to
the City of Renton. The King County version of Reference section 4, 5, 6, 7 and 8
apply to proposals in the City of Renton, and. in .some cases these references
have been.modified.
DEFINITIONS: The City of Renton has made changes to the definitions section
of the 2009 KCSWDM. This addendum to the Definitions Section provides
replacement text for the definitions that are changed. Apart from these changes,
the King County version of the Definitions Section applies for proposals in the
City of Renton.
THE CITY OF RENTON DRAFT STORMWATER DESIGN MANUAL UPDATE
Preface SEPA PAGE 3 OF 7
CITY OF RENTON STORMWATER DESIGN MANUAL UPDATE -DRAFT
CITY EQUIVALENTS FOR COUNTY AGENCIES
For proposals located within the City of Renton, all references in the KCSWDM to
the following County departments are to be replaced by reference to the City of
Renton Development Services Division (RDSD):
■ DDES (Department of Development and Environmental Services)
■ DNR (Department of Natural Resources)
■ SWM (Surface Water Management)
■ WLR (Water and Land Resources)
Unless the context requires otherwise, any reference to "County" or "King County"
shall refer to the City of Renton and any reference to County Staff shall refer to the
head of RDSD.
CITY EQUIVALENTS FOR COUNTY ORDINANCES
For proposals in the City of Renton, all reference in the KCSWDM to the following
ordinances or municipal codes shall be replaced by reference as indicated in the
following table:
CITY OF RENTON DRAFT STORMWATER DESIGN MANUAL UPDATE
PREFACE SEPA PAGE 4 OF 7
CITY OF RENTON STORMWATER DESIGN MANUAL UPDATE -DRAFT
In general, references to the King County Critical Areas Ordinance (KCC 21A) are to
be replaced by reference to the Renton Municipal Code (RMC) Title IV, particularly,
chapter RMC IV -3, Environmental Regulations and Overlay Districts.
THE CITY OF RENTON DRAFT STORMWATER DESIGN MANUAL UPDATE
Preface SEPA PAGE 5 OF 7
KCC 2.98
Critical Drainage Areas
Not Applicable
This term does not apply
KCC 16.82
BUILDING AND CONSTRUCTION
RMC IV
Development Regulations
STANDARDS -Clearing and Gradin
KCC 21A.14
Development Standards Design
RMC IV -44-30
City -Wide Property
Requirements
Development Standards:
Development Guidelines and
Regulations - General
KCC 21A.24
Critical Areas
RMC IV4-3.050
Critical Areas Regulations
KCC 21A.06
Technical Terms and Land Use
RMC IV4-11
Definitions
Definitions
KCC 21A.06 shall also apply
KCC 20.14
Basin Plans
RMC IV -4-4-030
Development Guidelines and
Regulations - GeneraI
KCC 25
Shoreline Management
RMC IV4-3-090
Shoreline Master program
Re ulations
KCC 9*
Surface Water Management
RMC IV -4-6-060
Drainage (Surface Water)
9.02
General Provisions
Standards
9.04
Surface Water Runoff Policy
9.08
Surface Water Management
Program
9.12
Water Quality
RMC IV
Development Regulations
9.14
Groundwater Protection
RMC IV -4-3-050
Critical Areas Regulations
In general, references to the King County Critical Areas Ordinance (KCC 21A) are to
be replaced by reference to the Renton Municipal Code (RMC) Title IV, particularly,
chapter RMC IV -3, Environmental Regulations and Overlay Districts.
THE CITY OF RENTON DRAFT STORMWATER DESIGN MANUAL UPDATE
Preface SEPA PAGE 5 OF 7
CITY OF RENTON STORMWATER DESIGN MANUAL UPDATE-DRAF i
CITY EQUIVALENTS FOR COUNTY MAPS
CITY OF RENTON DRAFT STORMWATER DESIGN MANUAL UPDATE
PREFACE SEPA PAGE 6 OF 7
Flaw Control Applications Map
Refer to new City of Renton Flaw Control Applications
Map.
Coal Mine Hazard Areas Map
Replace with:
Coal mine hazard areas within the jurisdiction of the
City of Renton, as defined in RMC IV -3-050 and the
City of Renton Coal Mine Hazards map (Figure 4-3-
050Q3a(i)).City of Renton Landslide Hazard Drainage
Area Ma
Landslide Hazard Area and Landslide
Replace with:
Drainage Areas Map
Landslide hazard areas within the jurisdiction of the
City of Renton, as defined in RMC IV -3-050 and the
City of Renton Landslide Hazards map (Figure 4-3-
050Q3c(i)).City of Renton Landslide Hazard Drainage
Area Map.
Water Quality Applications Map
King County Map does not apply. Basic or Enhanced
Water quality treatment BMPs required will be based
on land use and thresholds specified in this addendum.
Flood hazard area (as defined in KCC 21A.06)
Replace with:
Frequently flooded areas include all areas of special
flood hazards within the jurisdiction of the City of
Renton, as defined in RMC IV -3-050 and the City of
Renton Flood Hazards Ma (Figure 4-3-050Q2).
Erosion hazard area
Replace with:
Erosion hazard areas include all erosion prone areas
within the jurisdiction of the City of Renton, as defined
in RMC IV -3-050 and the City of Renton Erosion
Hazards Ma (Figure 4-3-050Q3b i .
Steep slope hazard area
Replace with:
(no map referenced in the KCSWDM)
Steep slope hazard areas include all steep slopes within
the jurisdiction of the City of Renton, as defined in
RMC IV -3-050 and the City of Renton Steep Slopes
Ma (Figure 4-3-050Q3e(i) .
Critical Aquifer recharge area (as defined in
Replace with:
KCC21A.06)
Aquifer Protection Zones are areas within the
jurisdiction of the City of Renton, as defined in RMC
IV -3-050 and the City of Renton Aquifer Protection
Zones Ma (Figure 4-3-050Q2).
CITY OF RENTON DRAFT STORMWATER DESIGN MANUAL UPDATE
PREFACE SEPA PAGE 6 OF 7
CITY OF RENTON STORMWATER DESIGN MANUAL UPDATE -DRAFT
CITY EQUIVALENTS FOR MISCELLANEOUS TERMS
Replace with:
Agricultural Project Resource Conservation (RC) Project
Agricultural Zone (A) Resource Conservation Zone (RC)
CITY EQUIVALENTS FOR COUNTY PLANS OR STUDIES
In general, references to County approved plans or studies in the KCSWDM are to
be replaced by reference to appropriate City approved plans or studies. When none
exists, references to County approved plans or studies shall be disregarded for the
development applications within the City of Renton.
COUNTY DESIGNATIONS THAT DO NOT APPLY IN THE CITY
The following designations are used in the 2009 KCSWDM but are not currently
used in the City of Renton; any reference in the KCSWDM to the existence of areas
with these designation or thresholds or requirements for such areas is to be
disregarded for the development applications with the City of Renton:
■ Sensitive Lake
■ Sphagnum Bog
■ Critical Drainage Area
■ Forest Production Zone Area
■ Rural Residential Development
■ Stormwater Compliance Plans (SWCPs)
■ Urban Planned Development
CONFLICTS IN APPLICATION OF KCSDM MODIFICATIONS TO CITY OF RENTON
Any conflict that arises between the KCSWDM and this addendum to the KCSWDM
shall be interpreted by the City of Renton RDSD. The RDSD will have final decision
on all interpretations.
THE CITY OF RENTON DRAFT STORMWATER DESIGN MANUAL UPDATE
Preface SEPA PAGE 7 OF 7
DRAFT
CHAPTER 1 - DRAINAGE REVIEW AND REQUIREMENTS
Key Terms and Definitions
Incorporate the following changes:
EXHIBIT 2.
CITY OF RENTON
CHAPTER ONE SEPA
PRINTED: 81512009, 2:58:30 PM
DRAFT STORMWATER DESIGN MANUAL UPDATE
PAGE 1 OF 23
Agriculture
Terri and definition generally does not apply to City of Renton. However, Prpjeicis
project
ztrith;theECify's Resiaurce C nsery ttbn.(RC) zone (1 DU11:0 ae). are included in This
(Page 1-2)
category,where,the KCSWI7I4%f apilie"s stariditrd and thresholds for agriclfure
a ects.
Critical aquifer
Replace as follows:
recharge area
(Page 1-2)
"Aquifer Protection Areas" (APAs) is the critical area designation, defined
and regulated in RMC 4-3-050, that is applied to areas where extra protection
of groundwater quantity and quality is needed because of known
susceptibility to contamination and importance to drinking water supply_
Such areas are delineated on the Aquifer Protection Zones map,
Figure 4-3-050Q1 in the RMC.
Critical
Tenn does not apply to City of Renton at this tune.
Drainage Area
(Page 1-2)
Erosion hazard
Replace as follows:
area
"Erosion hazard area" is the critical area designation, defined and regulated in
(Page 1-2)
RMC 4-3-050, that is applied to areas underlain by soils that are subject to severe
erosion when disturbed. Such areas are delineated on the Erosion Hazards map,
Figure 4-3-050Q3b(i) in the RMC.
Existing site
Replace with following definition:
conditions
"Existing site conditions" is the existing land cover.
Page 1-2
Flood Hazard
Replace as follows:
Area
"Flood hazard area" is the critical area designation, defined and regulated in
Page 1-3
RMC 4-3-050, that is applied to areas that are subject to flooding. Such areas are
delineated on the Flood Hazards snap, Figure 4-3-050Q2 in the RMC.
Groundwater
Replace as follows:
protection areas
(page do
,Groundwater protection areas" include "Aquifer Protection Areas" (APAs),
defined and regulated in RMC 4-3-050, that is applied to areas where extra
protection of groundwater quantity and quality is needed because of known
susceptibility to contamination and importance to drinking water supply.
Such areas are delineated on the Aquifer Protection Zones map,
Figure 4-3-050Q1 in the RMC.
CITY OF RENTON
CHAPTER ONE SEPA
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DRAFT STORMWATER DESIGN MANUAL UPDATE
PAGE 1 OF 23
CITY OF RENTON STORMWATER DESIGN MANUAL UPDATE-DRAF i
Landslide
Replace as follows:
Hazard Area
"Landslide hazard area" is the critical designation, defined and regulated in
(page 1-3)
RMC 4-3-050, that is applied to areas subject to severe risk of landslide due to
topography, soil conditions, and geology_ Such areas are delineated on the
Landslide Hazards map, Figure 4-3-050Q3v(i) in the RMC.
Landslide
Replace "Landslide Hazard Drainage Areas" with "Landslide Hazard Area" (see
Hazard
above).
Drainage Area
(page 1-3
Steep Slope
Replace as follows:
Hazard Area
"Steep Slope Hazard Ared' is the critical area designation, defined and regulated in
(page 1-6)
RMC 4-3-050, that is applied to areas where extra protection of sensitive slopes is
required. Also, Refer to the City of Renton Steep Slope Atlas.
Landslide
Replace "Landslide Hazard Drainage Areas" with "Landslide Hazard Area" (see
Hazard
above).
Drainage Area
(page 1-3
Notes:
1. Page number provided is initial page where term is used.
CITY OF RENTON DRAFT STORMWATER DESIGN MANUAL UPDATE
CHAPTER ONE SEPA PAGE 2 OF 23
CITY OF RENTON STORMWATER DESIGN MANUAL UPDATE -DRAFT
1.1 DRAINAGE REVIEW
Replace the Note at the bottom of the Guide to Using Section 1.1 rnith the following (page 1-
7):
Note: Applicant must attend a pre -application meeting in accordance with Chapter 2.
During pre -application meeting, applicants may confirm the type of drainage review and
scope of drainage requirements that apply to your project.
1.1.1 Projects Requiring Drainage Review
Replace item 4 as follows (pagel-9):
The project contains or is adjacent to an area with a documented drainage problem.27
Replace footnote 11 as follortls:
17 Contact RDSD for information about documented drainage problems, such as
documented in the latest version of the City of Renton Surface Water Utility Master Plan.
Replace the table of King County Permits and Approvals table on page 1-9 of the 2009
KCSWDM with the following table.
Building Permits/ Combination Building Permits
Construction Permits
Demolitions Permit
Flood Control Zone Permits
Grading/ Filling Permit
Land Use Permit
Rezones
Right -of -Way Use Application
Shoreline Permits
Short Subdivision Developments (Short Plat)
Subdivision Developments (Plats)
Other Citv of Renton permits as required
THE CITY OF RENTON DRAFT STORMWATER DESIGN MANUAL UPDATE
Chapter ONE SEPA PAGE 3 OF 23
CITY OF RENTON STORMVVATER DESIGN MANUAL UPDATE-DRAF ,
1.1.2 DRAINAGE REVIEW TYPES AND REQUIREMENTS
Replace Figure 1.1.2.A unth the folloiving (p. 1-11):
FIGURE 1.1.2.A FLOW CHART FOR DETERMINING TYPE OF DRAINAGE REVIEW REQUIRED
Is the project a single family residential or agriculture project that resu Its
in ?2,000 sf of new and/or replaced impervious surface or 0,000 sf of
land disturbing activity, AND meets the following criteria?
+ The project results in <_5,000 sf of new impery surface, and :_35,000 sf of
new pervious surface
1s the project result in 2_2,000 sf of
v and/or replaced impervious
face or �7, 000 sf of new pervious
face, OR is the project a
levelopment project on a parcel or
nbination of parcels in which new No
s replaced impervious surface
its 2_5,000 sf and whose valuation of
posed improvements (excluding
uired mitigation and frontage
�rovements) is >50% of the assessed
ae of existing improvements?
Yes
SMALL PROJECT DRAINAGE
REVIEW
Section 1.1.2.1
Note: The project may also be
subject to Targeted Drainage
Review as determined below.
Yes
Does the project have the characteristics of one or more of the following
categories of projects (see more detailed threshold language on p. 1-15)?
1. Projects containing or adjacent to a flood, erosion, or steep slope
hazard area; or documented drainage problem, projects within a
Landslide Hazard Area; or projects that propose 2_7,000 sf (1 ac if
project is in Small Project Drainage Review) of land disturbing
activity.
2. Projects proposing to constructor modify a drainage pipe/ditch that
is 12" or larger or receives runoff from a 12" or larger drainage
pipe/ditch.
3. Redevelopment projects proposing ?$100,000 in improvements to
an existing high -use site.
ks
Reassess whether
drainage review is
required per Section
1.1.1 (p. 1-9).
Is the project an Urban Planned Development (UPD), OR
does it result in 2!50 acres of new impervious surface No
within a subbasin or multiple subbasins that are
hydraulically connected, OR does it have a project site >_50
acres within an aquifer protection area?
Yes
Yes
TARGETED DRAINAGE REVIEW
Section 1.1.2.2
FULL DRAINAGE REVIEW
Section" 1.1.2.3
LARGE PROJECT DRAINAGE
REVIEW
Section 1.1.2.4
OF RENTON DRAFT STORMWATER DESIGN MANUAL UPDATE
'TER ONE SEPA PAGE 4 OF 23
CITY OF RENTON STORMWATER DESIGn MANUAL UPDATE -DRAFT
Replace Table 1.2.2.A with the follazc,ing (p. 1-12):
TABLE O.A REQUIREMENTS APPLIED UNDER EACH DRAINAGE REVIEW TYPE
Small Project
Targeted
Full
Large Project
Drainage
Drainage
Drainage
Drainage
Review
Review
Review
Review
Single family
Projects that are not subject to Full or
All projects that
UPDs, OR
residential
Large Project Drainage Review, AND
result in X2,000
projects that
projects or
have characteristics of one or more of
sf of new and/or
result in ?50
Agriculture
the following categories of projects:
replaced
acres of new
project that
1. Projects containing or adjacent to a
impervious
impervious
result in >2,000
flood, erosion, or steep slope
surface or
within a sub-
sf of new and/or
hazard area; projects within a
>_7,000 sf of
basin or mul-
replaced
Critical Drainage Area or Landslide
land disturbing
tiple subba-
impervious
Hazard Drainage Area; or projects
activity but are
sins that are
surface or
proposing >_7,000 sf of land
not subject to
hydraulically
2!7,000 sf of
disturbing activity (1 ac if in Small
Small Project
connected,
land
Project Drainage Review).
Drainage
OR project
disturbing
2. Projects that construct or modify a
Review, OR
sites >_50
activity but do
drainage pipe/ditch that is 12" or
redevelopment
acres within a
not exceed
larger or receive runoff from a 12" or
projects on a
critical aqui-
5,000 sf of new
larger drainage pipe/ditch.
single- or
fer recharge
impervious
3. Redevelopment projects with
multiple -parcel
area.
surface, and
?$100,000 in improvements to a
site in which the
35,000 sf of
high -use site(')
total of new plus
new pervious
replaced
surface?
impervious
surface is 5,000
square feet or
more and
whose valuation
of proposed
improvements
(including
interior
improvements
and excluding
required
mitigation and
frontage
improvements)
exceeds 50% of
the assessed
value of the
existing site
improvements
Category
Category
Category
1
2
3
SMALL PROJECT DRAINAGE
REQUIREMENTS
CORE REQUIREMENT #1
*(2)
✓
Discharge at Natural Location
CORE REQUIREMENT #2
*(2)
V/(3)
Offsite Analysis
CORE REQUIREMENT #3
*Ixy
✓(3)
�Is)
Flow Control
CORE REQUIREMENT #4
*{2}
it
V
Y
Conveyance System
THE CITY OF RENTON DRAFT STORMWATER DESIGN MANUAL UPDATE
Chapter ONE SEPA PAGE 5 OF 23
CITY OF RENTON STORMWATER DESIGN MANUAL UPDATE-DRAF r
CORE REQUIREMENT #5
I
V
/
Y
I
V
I
V
/
Y
Erosion & Sediment Control
CORE REQUIREMENT #6
*(2)
Maintenance & Operations
CORE REQUIREMENT #7
*(2)
✓(s)
f(s)
✓(3)
�(a)
Financial Guarantees & Liability
CORE REQUIREMENT #S Water
*(2)
J(3)
�(3)
Quality
SPECIAL REQUIREMENT #1
_/(3)
1�
'/(3)
/(3)
Other Adopted Requirements
SPECIAL REQUIREMENT #2
�(s)
/(3)
/(3)
Y
Flood Hazard Area Delineation
SPECIAL REQUIREMENT #3
/(3)
V/(3)
�(3)
Flood Protection Facilities
SPECIAL REQUIREMENT #4✓(3)
_/(3)
r
V/ (3)
✓(3)
-Source Control
SPECIAL REQUIREMENT #5_/(3)
1►
(3)
,/(3)
Oil Control
(1) Category 3 projects installing oil controls that construct or modify a 12 -inch pipe/12-inch deep ditch are also Category 2
projects_
(2) May be applied by RDSD based on project or site-specific conditions.
(3) These requirements have exemptions or thresholds that may preclude or limit their application to a specific project.
1 .1.2.1 SMALL PROJECT DRAINAGE REVIEW
Delete section 1.1.2.1 and replace in entirety znith the following (p. 1-13 to 1-14).
Small Project Drainage Review is a simplified drainage review for small residential
building, clearing, and subdivision projects that meet the threshold requirements of
this section. The core and special requirements applied under Full Drainage Review
are replaced with simplified small project drainage requirements that can be applied
by a non -engineer. These requirements include simple stormwater dispersion,
infiltration, and site design techniques called flow control Best Management
Practices (&MPs), which provide the necessary mitigation of flow and water quality
impacts for small projects. Also included are simple measures for erosion and
sediment control (ESC). This simplified form of drainage review acknowledges that
drainage impacts for many small project proposals can be effectively mitigated
without construction of costly flow control and water quality facilities.
The Small Project Drainage Review process minimizes the time and effort required to
design, submit, review, and approve drainage facilities for these proposals. In most
cases, the requirements can be met with submittals prepared by contractors,
architects, or homeowners without the involvement of a civil engineer.
Note: some projects subject to Small Project Drainage ReviezU may also require Targeted
Drainage Review if they meet any of the threshold criteria in Section 1.1.2.2
CITY OF RENTON DRAFT STORMWATER DESIGN MANUAL UPDATE
CHAPTER ONE SEPA PAGE 6 OF 23
v]TY OF RENTON STORMWATER DES1Gry MANUAL UPDATE -DRAFT
Threshold
Small Project Drainage Review is required for any single family residential project
that will result in 2,000 square feet' or more of new impervious surface, replaced
impervious surface, or new plus replaced impervious surface, or 7,000 square feet or
more of land disturbing activity and that meets one of the following criteria:
The project results in 55,000 sf of new impervious surface, and 535,000 sf of
new pervious surface
Note: for the purposes applying this threshold to a proposed single family residential
subdivision (i.e., plat or short plat project), the impervious surface coverage assumed on each
created lot shall be 4,000 square feet or the maximum allowed by the RMC IV, zvhichever is
less. A lower impervious surface coverage may be assumed for any lot in which the lower
impervious surface coverage is set as the maximum through a declaration of covenant
recorded for the lot. AIso, the new pervious surface assumed on each created lot shall be the
entire lot area, except the assumed impervious portion and any portion in zohich native
conditions are preserved by a clearing limit per RMC IV, a covenant or easement recorded for
the lot, or a tract dedicated by the proposed subdivision.
Scope of Requirements
RIF Small Project Drainage Review is required, THEN the proposed project must
a comply with the simplified small project submittal and drainage design
M requirements detailed in Small Project Drainage Requirements adopted as Appendix C
SI of the 2009 KCSWDM. These requirements include simplified BMPs/measures for
J flow control and erosion and sediment control.
Presumption of Compliance with Core and Special Requirements
The simplified drainage requirements applied under Small Project Drainage Review
are considered sufficient to meet the overall intent of the core and special
requirements in Sections 1.2 and 1.3, except under certain conditions when a
proposed project has characteristics that trigger Targeted Drainage Review (see the
threshold for Targeted Drainage Review in Section 1.1.2.2) and may require the
involvement of a civil engineer. Therefore, any proposed project that is subject to
Small Project Drainage Review as determined above and complies with the small
project drainage requirements detailed in Appendix C is presumed to comply with all
the core and special requirements in Sections 1.2 and 1.3 except those requirements
that would apply to the project if it is subject to Targeted Drainage Review as specified
in Section 1.1.2.2.
The thresholds of 2,000 and 7,000 square feet shall be applied by project site. All other thresholds
specified in terms of square feet of impervious or pervious surface shall be applied by threshold
discharge area..
THE CITY OF RENTON DRAFT STORMWATER DESIGN MANUAL UPDATE
Chapter ONE SEPA PAGE 7 OF 23
CITY OF RENTON STORMWATER DESIGN MANUAL UPDATE-DRAF i
1.1.2,2 TARGETED DRAINAGE REVIEW
Add the following to the end of the Threshold for TDR Project Category #1 (page 1-15).
A project is considered adjacent to a flood hazard area, erosion hazard area, or steep
slope hazard area if any portion of the project site is within 50 feet.
Linder Scope of Requirements, replace the first sentence of the third paragraph with the
following (page 1-15):
Compliance with these requirements requires the submittal of engineering plans and
calculations stamped by a civil engineer, unless deemed unnecessary by RDSD and
the City of Renton Surface Water Utility.
Under TDR Project Category #1 Requirements (page 1-16): Add that compliance with Core
Requirement No. 1 is also required.
1.1.2.4 LARGE PROJECT DRAINAGE REVIEW
If a project meets the Threshold far a Large Project Drainage Review, RDSD and the City of
Renton Surface Water Utility will determine if a Master Drainage PIan is required based on
the risk to downstream resources. If required, the scope of the requirements will be
determined by the Surface Water Utility and will generally follow King County's Master
Drainage Planning for Large or Complex Site Development and requirements set fourth in
Section 1.1.2.4. Where an MDP is not required, projects will need to follow the Full
Drainage Review Requirements.
1.1.4 DRAINAGE DESIGN BEYOND MINIMUM COMPLIANCE
Delete last two paragraphs of this section.
1.2.2 CORE REQUIREMENT #2: OFFSITE ANALYSIS
Delete paragraph 1 under "EXEMPTION FROM CORE REQUIREMENT #2 and replace
with the following:.
RDSD together with the City of Renton Surface Water Utility determine there
is sufficient information for them to conclude that the project will not have
significant adverse impact on the downstream and/or upstream drainage
system, OR
1.2.2.1 DOWNSTREAM ANALYSIS
Delete section on "Downstream Water Quality Problems Requiring Special Attention (pages
1-26 to 1-28) and replace with the following:
The downstream water quality problems requiring special attention as written in the
KCSWDM is not applicable at this time, but special requirements/ mitigation for
known water quality problems may be added in the future.
CITY OF RENTON DRAFT STORMWATER DESIGN MANUAL UPDATE
CHAPTER ONE SEPA PAGE 8 OF 23
CITY OF RENTON STORMWATER DESIGN MANUAL UPDATE -DRAFT
1.2.2.2 DRAINAGE PROBLEM IMPACT MITIGATION
Delete and replace the 3rd paragraph under "Principles of Impact Mitigation for Drainage
Problems with the following (page 1-28):
Creating a nezv drainage problem means increasing peak flows and/or volumes so that after
development, the frequency of conveyance overflows or water surface elevations exceeds the
thresholds for the various problem types discussed in Section 1.2.2.1. The City's Peak Rate
Runoff Control generally protects against this except in volume -sensitive drainage
system as discuss above. However, new problems are often identified during the
Level 1 downstream analysis, where the observation of a reduction in downstream
pipe sizes, for example, may be enough to predict creation of a new problem. A
Level 2 or 3 analysis will typically be required to verify the capacity of the system and
determine whether 100 -year flows can be safely conveyed.
Delete and replace the 31-4 paragraph under "Principles of Impact Mitigation for Drainage
Problems with the following (page 1-28):
1.2.2.3 WATER QUALITY PROBLEM IMPACT MITIGATION
Delete section on "Water Quality Problem Impact Mitigation (pages 1-31 to 1-33) and
replace with the following:
The water quality problems impact mitigation as written in the KCSWDM is not
applicable at this time, but special requirements/ mitigation for known water quality
problems may be added in the future.
1.2.3 CORE REQUIREMENT #3: FLOW CONTROL
Delete KCSWDM Section 1.2.3 and Subsection 1.2.3.1 (pages 1-34 through 1-44) in its
entirety and replace ivith the following:
All proposed projects, including redevelopment projects, must provide onsite flow
control facilities or flow control BMPs or both to mitigate the impacts of storm an
surface water runoff generated by new impervious surface, new pervious surface,
and replaced impervious surface targeted for flow mitigation as specified in the
following sections. FIow control facilities must be provided and designed to
perform as specified by the area -specific flow control facility requirements in Section
1.2.3.1 and in accordance with the applicable flow control facility implementation
requirements in Section 1.2.3.2.
The City of Renton encourages the use of flow control BMPs to reduce the amount
of runoff leaving the project site. Although flow control BMPs are not required by
the City, incorporation of flow control BMPs may eliminate the need or allow for a
decrease in the size of flow control facilities that might otherwise be required. Flow
control BMPs are discussed in Section 1.2.3.3.
Intent: To ensure the minimum level of control needed to protect downstream
properties and resources from increases in peak, duration, and volume of runoff
THE CITY OF RENTON DRAFT STORMWATER DESIGN MANUAL UPDATE
Chapter ONE SEPA PAGE 9 OF 23
CITY OF RENTON STORMWATER DESIGN MANUAL UPDATE-DRAF i
generated by new development. The level of control varies depending on location
and downstream conditions identified under Core Requirement #2.
❑ EXEMPTIONS FROM CORE REQUIREMENT #3
There are three possible exemptions from the flow control provisions of Core
Requirement #3.
1. Basic Exemption
A proposed project is exempt if it meets all of the following criteria:
a) Less than 5,000 square feet of new plus replaced impervious surface will be
created, AND
b) Less than 35,000 square feet of new pervious surfacez will be added.
2. Impervious Surface Exemption for Transportation Redevelopment Projects
A proposed transportation redevelopment project is exempt if it meets all of the
following criteria:
a) Less than 5,000 square feet of new plus replaced impervious surface will be
created, AND
b) Less than 35,000 square feet of new pervious surfacez will be added.
c) The total new impervious surface within the project limits is less than 50% of
the existing impervious surface.
3. Cost Exemption for Parcel Redevelopment Projects
A proposed redevelopment project on a single or multiple parcel site is exempt if
it meets all of the following criteria:
d) Less than 5,000 square feet of new plus replaced impervious surface will be
created, AND
e) Less than 35,000 square feet of new pervious surface' will be added.
f} The valuation of the project's proposed improvements (including interior
improvements and excluding required mitigation improvements) is less than
50% of the assessed value of the existing site improvements.
P Note: If the project's new pervious surface exceeds 7,000 square feet, the soil moisture holding capacity
of the new pervious surface must be protected as described at the end of this subsection. . The
specifications for soil amendment can be found in Reference Section 4A.
z
z
CITY OF RENTON
CHAPTER ONE $EPA
DRAFT STORMWATER DESIGN MANUAL UPDATE
PAGE 10 OF 23
N
CITY OF RENTON STORMWATER DESIGN MANUAL UPDATE -DRAFT
Protection of New Pervious Surfaces: The duff layer and native topsoil shall be
retained in an undisturbed state to the maximum extent practicable. Any duff layer
or topsoil removed during grading shall be stockpiled on-site in a designated,
controlled area not adjacent to public resources and critical areas. The material shall
be reapplied to other portions of the site where feasible. Except as otherwise noted
below, areas that have been cleared and graded shall have the soil moisture holding
capacity restored to that of the original undisturbed soil native to the site to the
maximum extent practicable. The soil in any area that has been compacted or that
has had some or all of the duff layer or underlying topsoil removed shall be
amended to mitigate for lost moisture -holding capacity. The amendment shall take
place between May 1 and October 1. Replaced topsoil shall be a minimum of eight
inches thick, unless the applicant demonstrates that a different thickness will
provide conditions equivalent to the soil moisture -holding capacity native to the site.
Replaced topsoil shall have an organic matter content of between eight to thirteen
percent dry weight and a pH suitable for the proposed landscape plants.
This requirement does not apply to areas that at project completion are covered by
an impervious surface, incorporated into a drainage facility or engineered as
structural fill or slope.
The specifications for soil amendment can be found in Reference Section4A.
1.2.3.1 AREA -SPECIFIC FLOW CONTROL FACILITY REQUIREMENT
Projects subject to Core Requirement 43 must provide flow control facilities as
specified by the area -specific facility requirements and exceptions for the designated
flow control area in which the proposed project or threshold discharge area of the
proposed project is located as described in Subsections A, B, and C below.
Guide to Applying the Area -Specific Flow Control Facility Requirement
The flow control facility requirement varies across the city landscape according to
the flow control area within which the project is located. There are currently three
such flow control areas, which are depicted on the City of Renton plow Control
Applications Map adopted with this manual. These are referred to as the "area -
specific flow control facility requirements", and are:
i. Flow Control Duration Standard - Matching Forested (historic) conditions for
areas draining to streams and subject to flow-related water quality problems
such as erosion or sedimentation.
2. Flow Control Duration Standard - Matching Existing site conditions in
designated highly urbanized areas draining to streams that are currently stable
or showing no impacts caused by high flows.
THE CITY OF RENTON DRAFT STORMWATER DESIGN MANUAL UPDATE
Chapter ONE SEPA PAGE 11 OF 23
City of Renton Department of Community & Economic Development
ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET
REV€EWING DEPARTMENT: �} �`
COMMENTS DUE: JUNE 19, 2009
APPLICATION NO: LUA09-061, ECF
DATE CIRCULATED: JUNE 5, 2009
APPLICANT: Allen Qu nn - City of Renton
PLANNER: Jerry Wasser CITY OFRENTp
Air
D
PROJECT TITLE: 2009 City of Renton Surface Water Design
PLAN REVIEWER: Kayren Kittrick
Manual
AN
SITE AREA: N/A
EXISTING BLDG AREA(gross: N/A
ULPILUING DIVISION
LOCATION: Citywide
PROPOSED BLDG AREA (gross) 9!
Animals
WORK ORDER NO: 78068
SUMMARY OF PROPOSAL: The applicant is requesting a non -project Environmental (SEPA) Review of a new City of Renton
Surface Water Design Manual for new development, redevelopment and construction sites in the City of Renton that are equivalent to
the minimum technical requirements, thresholds and definitions in Appendix I of the Washington Department of Ecology's Phase II
National Pollution Discharge Elimination System (NPDES) Municipal Stromwater Permit for Western Washington. In order to meet
these standards, the City proposes to amend the Renton Municipal Code by adopting the 2009 King County Surface Water Design
Manual (KCSWDM) with City addendums containing specific requirements and procedures applicable to the City. Most changes to
the 2009 KCSWDM are minor; however, the Renton Surface Water Design Manual would apply different flow standards in certain
areas of the City that meet the minimum requirements in the permit provided they are approved by the Department of Ecology.
A. ENVIRONMENTAL IMPACT (e.g. Non -Code) COMMENTS
Element of the
Environment
Probable
Minor
Impacts
Probable More
Major Information
Impacts Necessary
Earth
Housing
Air
Aesthetics
Water
Plants
Land/Shorefirie Use
Recreation
Animals
Utrliries
Environmental Health
Energy/
Nahrral Resources
Pubic Services
B_ POLICY -RELATED COMMENTS
C. CODE -RELATED COMMENTS
Element cf the
Environment
Probable
Minor
Impacts
Probable
Major
Impacts
More
Information
Necessary
Housing
Aesthetics
Light/Glare
Recreation
Utrliries
Transportation
Pubic Services
NistoricrCultural
Preservation
Airport Environment
19.000 Peet
14.000 Feet
We have reviewed this application with particular attention to those areas in which we have expertise and have identified areas of probable impact or
areas where additional information is needed to properly assess this proposal.
C_ /"� (5 l
Signature of Director or Authorized Representative Date
City of Renton Department of Community & Economic Development
ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET
REVIEWING DEPARTMENT: ffirv_J
COMMENTS DUE: .JUNE 19, 2009
More
Information
Necessary
APPLICATION NO: LUA09-061, ECF
DATE CIRCULATED: JUNE 5, 2009
APPLICANT: Allen Qu nn -_City of Renton
PLANNER: Jerry Wasser
Recreation
PROJECT TITLE: 2009 City of Renton Surface Water Design
PLAN REVIEWER: Kayren Kittrick1
Manual
Public Services
SITE AREA: NIA
EXISTING BLDG AREA (gross): N/A
Animals
LOCATION: Citywide
PROPOSED BLDG AREA(gross) N/A
r -
Energy/
Natural Resources
WORK ORDER NO: 78068
UP
SUMMARY OF PROPOSAL: The applicant is requesting a non -project Environmental (SEPA) Review of a new City of Renton
Surface Water Design Manual for new development, redevelopment and construction sites in the City of Renton that are equivalent to
the minimum technical requirements, thresholds and definitions in Appendix I of the Washington Department of Ecology's Phase II
National Pollution Discharge Elimination System (NPDES) Municipal Stromwater Permit for Western Washington. In order to meet
these standards, the City proposes to amend the Renton Municipal Code by adopting the 2009 King County Surface Water Design
Manual (KCSWDM) with City addendums containing specific requirements and procedures applicable to the City. Most changes to
the 2009 KCSWDM are minor; however, the Renton Surface Water Design Manual would apply different Flow standards in certain
areas of the City that meet the minimum requirements in the permit provided they are approved by the Department of Ecology.
A. ENVIRONMENTAL IMPACT (e.g. Non -Code) COMMENTS
Element of the
Environment
Probable Probable
Minor Major
Impacts Impacts
More
Information
Necessary
Earth
Aesthetics
Air
Recreation
Water
utififies
Plants
Public Services
Land/Shorefiate Use
HistoriclCulturaf
Preservation
Animals
Environmental Health
Energy/
Natural Resources
B. POLICY -RELATED COMMENTS
Element of the
Environment
Probable Probable More
Minor Major Information
Impacts Impacts Necessary
Housing
Aesthetics
Lr ht/Grare
Recreation
utififies
Transportation
Public Services
HistoriclCulturaf
Preservation
Airport Environment
10,000 Feet
14,000 Feet
- t, la? 94,
/u_ /z,& /
C. CODE-RELA TED COMMENTS
.�2wLC c�iLe f2t�.-�Y�ij�� fd %C�,ra
We have reviewed this application with particular attention to those areas in which we have expertise and have identified areas of probable impact or
areas where additional informahieta, is needed to properly assess this proposal.
Signature of Director or Autho
6�T
Date
City of Renton Department of Community & Economic Development
ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET
REVIEWING DEPARTMENT: ��/
COMMENTS DUE: JUNE 19, 2009
APPLICATION NO: LUA09-061, ECF
DATE CIRCULATED: JUNE 5, 2009
APPLICANT: Allen Qu nn - City of Renton
PLANNER: Jerry Wasser
PROJECT TITLE: 2009 City of Renton Surface Water Design
Manual
PLAN REVIEWER: Kayren Kittrick
SITE AREA: N/A
EXISTING BLDG AREA (gross): N/A
LOCATION: Citywide
PROPOSED BLDG AREA(gross) NIA
water
WORK ORDER NO: 78068
SUMMARY OF PROPOSAL: The applicant is requesting a non -project Environmental (SEPA) Review of a new City of Renton
Surface Water Design Manual for new development. redevelopment and construction sites in the City of Renton that are equivalent to
the minimum technical requirements, thresholds and definitions in Appendix I of the Washington Department of Ecology's Phase II
National Pollution Discharge Elimination System (NPDES) Municipal Stromwater Permit for Western Washington. In order to meet
these standards, the City proposes to amend the Renton Municipal Code by adopting the 2009 King County Surface Water Design
Manual (KCSWDM) with City addendums containing specific requirements and procedures applicable to the City. Most changes to
the 2009 KCSWDM are minor; however, the Renton Surface Water Design Manual would apply different flow standards in certain
areas of the City that meet the minimum requirements in the permit provided they are approved by the Department of Ecology.
A. ENVIRONMENTAL IMPACT (e.g_ Non -Code) COMMENTS
Element of the
Environment
Probable
Minor
Impacts
Probable
Major
Impacts
More
Information
Necessary
Earth
Aesthetics
Air
Li hUGlare
water
Utilities
Plants
Transportation
Land/Shoreline Use
Public Services
Animals
Airport Environment
10, 000 Feet
14, 000 Feet
Environmental Health
Energy/
Natural Resources
B. POLICY -RELATED COMMENTS
C. CODE -RE AZTEDCMMENTS
-:
Element of the
Environment
Probable
Minor
Impacts
Probable More
Major Information
Impacts Necessary
Housing
Aesthetics
Li hUGlare
Recreation
Utilities
Transportation
Public Services
Nistonr./Cultural
Prpservalion
Airport Environment
10, 000 Feet
14, 000 Feet
We have re) iewe application 'h particular attention to those areas in which we have expertise and havIden ed areas of probable impact or
areas where -m, Tonal t formati s needed to properly assess this proposal.
signature of,pygawor Au or' 1kepresentative
City of Renton Department of Community & Economic Development
ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET
REVIEWING DEPARTMENT:
COMMENTS DUE: .DUNE 19, 2009
APPLICATION NO: LUA09-061, ECF
DATE CIRCULATED: JUNE 5, 2009
APPLICANT: Allen Qu nn - City of Renton
PLANNER: Jerry Wasser
PROJECT TITLE: 2009 City of Renton Surface Water Design
Manual
PLAN REVIEWER: Kayren Kittrick
SITE AREA: N/A
EXISTING BLDG AREA (gross): N/A
LOCATION: Citywide
PROPOSED BLDG AREA(gross) NIA
Animals
WORK ORDER NO: 78068
SUMMARY OF PROPOSAL: The applicant is requesting a non -project Environmental (SEPA) Review of a new City of Renton
Surface Water Design Manual for new development, redevelopment and construction sites in the City of Renton that are equivalent to
the minimum technical requirements, thresholds and definitions in Appendix I of the Washington Department of Ecology's Phase II
National Pollution Discharge Elimination System (NPDES) Municipal Stromwater Permit for Western Washington. In order to meet
these standards, the City proposes to amend the Renton Municipal Code by adopting the 2009 King County Surface Water Design
Manual (KCSWDM) with City addendums containing specific requirements and procedures applicable to the City. Most changes to
the 2009 KCSWDM are minor; however, the Renton Surface Water Design Manual would apply different flow standards in certain
areas of the City that meet the minimum requirements in the permit provided they are approved by the Department of Ecology.
A. ENVIRONMENTAL IMPACT (e.g. Non -Code) COMMENTS
Element of the
Environment
Probable Probable More
Minor Major Information
impacts impacts Necessary
Earth
Air
Water
plants
Land/Shoreline Use
Animals
Environmental Health
Energy/
Natural Resources
Airport Environment
10, 000 Feet
79.000 Feet
B. POLICY -RELATED COMMENTS
C. CODE -RELATED COMMENTS
Element of the
Environment
Probable Probable More
Minor Major information
Impacts Impacts Necessary
Nousin
Aesthetics
Li ht/Giare
Recreation
Utilities
Transportation
Public Services
HistorWCult ural
Preservation
Airport Environment
10, 000 Feet
79.000 Feet
We have reviewed this application with particular attention to those areas in which we have expertise and have identified areas of probable impact or
areas where additional information is needed to properly assess this proposal.
241�� � � � &:_ f -B GaLoo,
5ignaty.Kof girector or Authorized Representative Qat
City of Renton Department of Community & Economic Development
ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET
REVIEWING DEPARTMENT:
COMMENTS DUE: JUNE 99, 2009
APPLICATION NO: LUA09-061, ECF
DATE CIRCULATED: JUNE 5. 2009
APPLICANT: Allen Qu nn - City of Renton
PLANNER: Jerry Wasser
PROJECT TITLE: 2009 City of Renton Surface Water Design
Manual
PLAN REVIEWER: Kayren Kittrick
SITE AREA: N/A
EXISTING BLDG AREA (gross): NIA
LOCATION: Citywide
PROPOSED BLDG AREA(gross) NIA
Water
WORK ORDER NO: 78068
SUMMARY OF PROPOSAL: The applicant is requesting a non -project Environmental (SEPA) Review of a new City of Renton
Surface Water Design Manual for new development, redevelopment and construction sites in the City of Renton that are equivalent to
the minimum technical requirements, thresholds and definitions in Appendix I of the Washington Department of Ecology's Phase II
National Pollution Discharge Elimination System (NPDES) Municipal Stromwater Permit for Western Washington. In order to meet
these standards, the City proposes to amend the Renton Municipal Code by adopting the 2009 King County Surface Water Design
Manual (KCSWDM) with City addendums containing specific requirements and procedures applicable to the City. Most changes to
the 2009 KCSWDM are minor: however. the Renton Surface Water Design Manual would apply different flow standards in certain
areas of the City that meet the minimum requirements in the permit provided they are approved by the Department of Ecology.
A. ENVIRONMENTAL IMPACT (e.g. Non -Code) COMMENTS
Element of the
Environment
Probable
Minor
Impacts
Probable
Major
impacts
More
Information
Necessary
Earth
Aesthetics
Air
Li hl/Glare
Water
utilities
Plants
Transporrabon
Land/Shoreline Use
Public Services
Animals
Airport Environment
10,000 Feet
14,000 Feet
Environmental Health
Energy/
Natural Resources
B. POLICY -RELATED COMMENTS
C. CODE-RELA TED COMMENTS
Element of the
Environment
Probable Probable
Minor Major
Impacts Impacts
More
Information
Necessary
HDosin
Aesthetics
Li hl/Glare
Recreation
utilities
Transporrabon
Public Services
Hisforic/Cultural
Preservation
Airport Environment
10,000 Feet
14,000 Feet
We have reviewed this application with particular attention to those areas in which we have expertise and have identified areas of probable impact or
areas where additional information is needed to property assess this proposal.
r
Signature of Director 6r Authorized Representative
Date
City of Renton Department of Community & Economic Development
ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET
REVIEWING DEPARTMENT: +) ` uz
COMMENTS DUE: JUNE 19, 2049
APPLICATION NO: LUA09-061. ECF
DATE CIRCULATED: JUNE 5, 2009
APPLICANT: Allen Qu nn - City of Renton
PLANNER: Jerry Wasser
PROJECT TITLE: 2009 City of Renton Surface Water Design
Manual
i
PLAN REVIEWER: Kayron Kittrick RECEIVED
SITE AREA: N/A
EXISTING BLDG AREA (gross): WA JUN 0 5 2009
LOCATION: Citywide
PROPOSED BLDG AREA(gross) NIA BUILDING DIVIRI
Plants
WORK ORDER NO: 78068
SUMMARY OF PROPOSAL: The applicant is requesting a non -project Environmental (SEPA) Review of a new City of Renton
Surface Water Design Manual for new development, redevelopment and construction sites in the City of Renton that are equivalent to
the minimum technical requirements, thresholds and definitions in Appendix I of the Washington Department of Ecology's Phase II
National Pollution Discharge Elimination System (NPDES) Municipal Stromwater Permit for Western Washington. In order to meet
these standards, the City proposes to amend the Renton Municipal Code by adopting the 2009 King County Surface Water Design
Manual (KCSWDM) with City addendums containing specific requirements and procedures applicable to the City. Most changes to
the 2009 KCSWDM are minor: however, the Renton Surface Water Design Manual would apply different flow standards in certain
areas of the City that meet the minimum requirements in the permit provided they are approved by the Department of Ecology.
A. ENVIRONMENTAL IMPACT (e.g. Non -Code) COMMENTS
Element of the
Environment
Probable
Minor
Impacts
Probable More
Major Information
Impacts Necessary
Earth
Air
Water
Plants
Land/Shoreline Use
Animais
Environmental Health
Energy/
Natural Resources
Airport Environment
10, 000 Feet
14, 000 Feet
NC�
B. POLICY -RELATED COMMENTS
Q 0,,z—
C. CODE-RELA TED COMMENTS
Element of the
Environment
Probable
Minor
Impacts
Probable More
Major Information
Impacts Necessary
Housin
Aesthetics
Lt ht/GJare
Recreation
Utilities
Trarisipartation
Public Services
HistorlclCultural
Preservation
Airport Environment
10, 000 Feet
14, 000 Feet
We have reviewed this application with particular attention to those areas in which we have expertise and have identified areas of probable impact or
areas where additional information is needed to properly assess this proposal.
of Director or Authorized Representative
Date
A
City of Renton Department of Community & Economic Deve,opment
ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET
REVIEWING DEPARTMENT r y }
COMMENTS DUE: JUNE 19, 2009
APPLICATION NO: LUA09-061, ECF
DATE CIRCULATED: JUNF 5, 2009
APPLICANT: Ailen Qu nn - City of Renton
PLANNER: Jerry Wasser CITY OFRENTON
PROJECT TITLE 2009 City of Renton Surface Water Design
Manual
PLAN REVIEWER: Kayren Kittrick
JUN 0 5 2009
SITE AREA: NIA
LOCATION: Citywide
EXISTING BLDG AREA (gross): NIA
PROPOSED BLDG AREA(gross) N/A
Land/Shoreline i/se
WORK ORDER NO: 78068
SUMMARY OF PROPOSAL: The applicant is requesting a non -project Environmental (SEPA) Review of a new City of Renton
Surface Water Design Manual for new development, redevelopment and construction sites in the City of Renton that are equivalent to
the minimum technical requirements, thresholds and definitions in Appendix I of the Washington Department of Ecology's Phase II
National Pollution Discharge Elimination System (NPDES) Municipal Stromwater Permit for Western Washington. In order to meet
these standards, the City proposes to amend the Renton Municipal Code by adopting the 2009 King County Surface Water Design
Manual (KCSWDM) with City addendums containing specific requirements and procedures applicable to the City. Most changes to
the 2009 KCSWDM are minor; however, the Renton Surface Water Design Manual would apply different flow standards in certain
areas of the City that meet the minimum requirements in the permit provided they are approved by the Department of Ecology.
A. ENVIRONMENTAL IMPACT (e.g. Non -Code) COMMENTS
Element of the
Environment
Probable Probable More
Minor Major Information
Impacts Impacts Necessary
Earth
Housing
Air
Water
Plants
Light/Glare
Land/Shoreline i/se
Animals
Environmental Health
utilities
Energy/
Natural Resources
Transportation
B. POLICY -RELATED COMMENTS
C. CODE-RELA TED COMMENTS
IN
Element of the
Environment
Probable
Minor
Impacts
Probable More
Major Information
Impacts Necessary
Housing
Aesthetics
Light/Glare
Recreation
utilities
Transportation
Public Services
Historic/Cultural
Preservation
Airport Eovimoment
10, 000 Feet
14, 000 Feet
We have reviewed this application with particular attention to those areas in which we have expertise and have identified areas of probable impact or
areas where additional information is needed to properly assess this proposal,
5igll�iafte of Director or Aufhorized Representative
i
Date
(;its of 00
•-`
,.moo,,
NOTICE OF APPLICATION AND PROPOSED DETERMINATION
OF NON -SIGNIFICANCE (DNS)
pATE' June 5, 2'?09
LAND OSE NOMRER, LUAhP-c81. ECF
PROJECT NAME; 2009 City et Re nion SudaCe Water fiesiyn Manual
PROJECT DESCRIPTIONThe appl;rant is requesting a nen-pru;"I En���OnRrenlal fStPPj ftcvicw o' a
n¢�+Clly of iS.d Ge Water Design Nanu al for new Oeticlopmonl, :.diaad rnnsvucliun riles in IhC Cllr
at Renlon that are egVlvalenl to I— mininrm Iec,_1 requi!ements, tlneshDIds wC dafinllious nr Appen;ir I of the
WashnMW1 Department of Ecold,Ys Pi 11 1 Pn11utihn Disci Ell„I 11n System INPDES} Municl pal
Shem-Un Permit for Waste. Washington- In order K .reel Ihesu standards. III CIN prr9wses to amend the Rerotun
Municipal Code by adopli ng the 2009 king County Snrtace W'aler Design :Aerual (KCSVfDi with City addenda ms
' 'ning spocific requirements antl prmetlures appliCahle le Ihu City. Mgel .hanger lu hie 20 9 KCSV40M a: e mirgr;
however. Inn Renlon Surface Wale' Desitin Mon nal would opal,difr—dt qo�.v sla'dards in cenalr areas of lire Cih• that
meCl the mrm_h, regvir¢menrs in I- i pm ded they are appmvedy '.Ire Ou�adrrerrt qt Ecalopy,
PROJECT LOCATION: Citywide
OF IONAL DETERMINATION OF NONSIGNIFICANCE (Di As the Lead Agency. the Cil'f of Renlon has
tleterminetl Kral sigeifi_ani em'ironmenlal impdGts are unlikely t6 resulllmm tt�e er.posaa project. therefore, as pe�minM
.ruder Ito. RCW 13.21C 11], the Cily al Renlen rs us irg Ne oprinnal DNS Prgcess to give notice Ih ala DNS iS Iii,I,. be
igsraed- Comment nenads fur the p'01¢Cr -1 the proposed ONS are irrteprated Into a hni wm.cnl period 71.111
be no --.t pedotl lollcmng the ls30ance oh the Throshpltl:3etenninalioo MNnn-SlymScance M;tigal^';Dt;S',. �'4
day appea' , rind -til lullory ii!5 ance cl Ite DNS.
PERMIT APPLICATION DATE N1ay 29%003
NOTICE OF COMPLETE APPLICATION: Jdre 5, 2G09
APPLICANTIPROJECT CONTACT PERSDN: Clm U,yrlrn Cky at to wsa goo TO. I425) 430-7247;
pgrmilslReview Requested: Environmental jSEPAI Review
Other Pe rmiis whiGR may be req,ni NIA
Requi Studies 3009 King County Surface W.—De.i,n Manual
Location Where application may
be reviewed: Department o1 Comruunlly A Ew mic Dev.lopmenl (CEOI-Planning
D iv isle n- Sixth Floor Reran City Mail. 1055 Sarrlh Grady Way, Rentc I. VIA
98057
PJBLIC HEARING. NIA
CONSISTENCY OVERVIEW:
Zoninglland use: N'A
Environmental Documems 1Ral
E -boat¢ the Prop osed Prajeol' _n+..nmenlal lSFP4l Chem
OavClOpment R.9ulaligns
i For Pro{eel Mllparyon M1IA
Comment. on Iha above app Ncalion must bo -i
Ir -riling to Gerald C- Wasser, A,P{ann¢r, CED -
Plagning Oer slop, 1055 South Grady Way, Rei l on, WA 99057. by 5:60 YM on June 19, 211 If yc ham quartiles
about deo p,,p,sal. Or wish to ue rnaCe a pa+y' of record and reCOIC addil mal nai Ly mail, r„rntact 1.`e f"I'_i
Maragef. Anyone whe subnri5 _i rnmmenls .vrN automatiraily be seine a •-ay of rr d and .vat be nulitia:; of mrC
dodsid. nn this protect.
CONTACT PERSON: Geraid C. Wasser, Associate Planner, Tel: (425] 41C-7322,
Ent gwassen®renbonwe.goy
PLEASE INCLUDE THE PROJECT NUMBER WHEN CALLING FOR PROPER FILE IDENTIMATION
It
yd. :.1d like to he nwde a part)• of record to rec I�Rher informatiun o•r th.a proposed pm:e,.l, Tc ikiela
this form end return Rentor.
lo: City of , CED Planr.tng Uivisron, IC.r5 Se. Grady SYay, Renton . , WA9L 57
`ameli No.; 2009 Cily o' Renton Surface'Nato, Uesiyn M—A"LUA09-C1i'.. `-Cr
NIA GI NG ADDRESS:-
TELEPHONt Na --
CERTIFICATION
I,/,zz!,;���erebyX certify that co of the ab ocum 'YNjv
were osted b mZin:2 cons icuous laces or nearb escri�P YP P YDATE: 6 _� � SIGNS
ATTEST: Subscribed and sworn before me, a Notary Public, in and for the State of Washington residing in f j
on the day of „dam A
�u NOTARY PI LIC SIGN E:
1tv 0i -
NOTICE OF APPLICATION AND PROPOSED DETERMINATION
OF NON -SIGNIFICANCE (DNS)
DATE: June 5, 2009
LAND USE NUMBER: LUA09-061, ECF
PROJECT NAME: 2009 City of Renton Surface Water Design Manual
PROJECT DESCRIPTION: The applicant is requesting a non -project Envirenmentai (SEPA) Review of a
new City of Renton Surface Water Design Manual for new development, redevelopment and construction sites in the City
of Renton that are equivalent to the minimum technical requiremenls, thresholds and definitions in Appendix I of the
Washington Department of Ecology's Phase li National Pollution Discharge Elimination System (NPDES) Municipal
Stromwater Permit for Western Washington. In order to meet these standards, the City proposes to amend the Renton
Municipal Code by adopting the 2009 King County Surface Water Design Manual (KCSWDM) with City addendums
containing specific requirements and procedures applicable to the City_ Most changes to the 2009 KCSWDM are rninor;
however, the Renton Surface Water Design Manual would apply different flow standards in certain areas of the City that
meet the minimum requirements in the permit provided they are approved by line Department of Ecology.
PROJECT LOCATION: Citywide
OPTIONAL DETERMINATION OF NON -SIGNIFICANCE (DNS): As the Lead Agency, the Citv of Renton has
determined that significant environmental impacts are unlikely to result from the proposed project. Ti as permitted
cinder the RCW 43.21C.110, the City of Renton Is using the Optional DNS process to give notice that a DNS is likely to be
issued. Comment periods for the project and the proposed DNS are integrated into a single comment period. There will
be no comment period following the issuance of the Threshold Determination of Nan -Significance -Mitigated (DNS). A 14 -
day appeal period will follow the issuance of the DNS.
PERMIT APPLICATION DATE: May 29, 2009
NOTICE OF COMPLETE APPLICATION: June 5, 20D9
APPLICANT7PROJECT CONTACT PERSON: Allen Quynn, City of Renton; Tel: (425) 430-7247;
Emil: aquynn@rentonwa.gov
PermilsfReview Requested: Environmental (SEPA) Review
Other Permits which maybe required: NIA
Requested Studies: 2009 King County Surface Water Design Manual
Location where application may
be reviewed: Department of Community 8 Economic Development (CED) — Planning
Division, Sixth Floor Renton City Hall, 1055 South Grady Way, Renton, WA
98057
PUBLIC BEARING NIA
CONSISTENCY OVERVIEW;
Zoning)Land Use: NIA
Environmental Documents that
Evaluate the Proposed Project: Environmental (SEPA) Checklist
Development Regulations
Used For Project Mitigation: N/A
Comments on the above application must be submitted in writing to Gerald C. Wasser, Associate Planner, CED —
Planning Division, 1055 South Grady Way, Renton, WA 98057, by 5:00 PM on June 19, 2009. If you have questions
about this proposal, or wish to be made a party of record and receive additional notification by mail, contact the Project
Manager. Anyone who submits written comments will automatically become a party of record and will be notified of any
decision on this project.
CONTACT PERSON: Gerald C. Wasser, Associate Planner; Tel: (425) 434-7382;
Emil: gwasser@rentonwa.gov
PLEASE INCLUDE THE PROJECT NUMBER WHEN CALLING FOR PROPER FILE IDENTIFICATION
If you would like to be made a party of record to receive further information on this proposed project, complete
this form and return to City of Renton, CED — Planning Division, 1055 So. Grady Way, Renton, WA 98057.
NamelFile No.: 2009 City of Renton Surface Water Design Manua IILUA09-061, ECF
NAME:
MAILING ADDRESS
TELEPHONE NO.:
DEPARTMENT OF COMMUNITY c�tyar
AND ECONOMIC DEVELOPMENT
M E M O R A N D U M
DATE:
lune S, 2009
T0;
Allen Quynn, Utility Systems
FROM:
Gerald C. Wasser, Planni w
SUBJECT:
Notice of Complete Application
2009 City of Renton Surface Water Design Manual, LUA09-061, ECF
The Planning Division of the City of Renton has determined that the subject application
is complete according to submittal requirements and, therefore, is accepted for review.
It is tentatively scheduled for consideration by the Environmental Review Committee on
June 22, 2009. Prior to that review, you will be notified if any additional information is
required to continue processing your application.
Please contact me, at 430-7382 if you have any questions.
cc: Yellow File
Acceptance Memo 09-061.doc
City of Renton
LAND USE PERMIT
MASTER APPLICATION
PROPERTY OWNER(S)
NAME: City of Renton
ADDRESS: 9055 S Grady Way
CITY: Renton zIP:98057
TELEPHONE NUMBER: 425-430-7247
APPLICANT (if other than owner)
NAME:
COMPANY (if applicable):
ADDRESS:
CITY: ZIP:
TELEPHONE NUMBER
CONTACT PERSON
NAME: Allen Quynn
COMPANY (if applicable): CltyofRenton
ADDRESS: 1055 S. Grady Way
CITY: Renton zIP:98057
TELEPHONE NUMBER AND E-MAIL ADDRESS:
PROJECT INFORMATION
PROJECT OR DEVELOPMENT NAME: City of Renton
Surface Water Design Manual
PROJECTIADDRESS(S)ILOCATION AND ZIP CODE:
NIA
KING COUNTY ASSESSOR'S ACCOUNT NUMBER(S):
NIA
EXISTING LAND USE(S): NIA
PROPOSED LAND USE(S): NIA
EXISTING COMPREHENSIVE PLAN MAP DESIGNATION:
NIA
PROPOSED COMPREHENSIVE PLAN MAP DESIGNATION
(if applicable): NIA
EXISTING ZONING: NIA
PROPOSED ZONING (if applicable): NIA
SITE AREA (in square feet): NIA
SQUARE FOOTAGE OF PUBLIC ROADWAYS TO BE
DEDICATED: NIA
SQUARE FOOTAGE OF PRIVATE ACCESS EASEMENTS:
NIA
PROPOSED RESIDENTIAL DENSITY IN UNITS PER NET
ACRE (if applicable): NIA
NUMBER OF PROPOSED LOTS (if applicable): N/A
H:Tile Sy51SWP - Sutface Water Projects�SWP-27 - Surface Water Projects (C]P)\27-3129 Renton Storrnwater Manuakl300-SEPA'unastetapp.doc - 1 -
F )JECT INFORMATION (con jed
NUMBER OF NEW DWELLING UNITS (if applicable): NIA
N/A
NUMBER OF EXISTING DWELLING UNITS (if applicable):NIA
SQUARE FOOTAGE OF PROPOSED RESIDENTIAL
BUILDINGS (if applicable): N/A
SQUARE FOOTAGE OF EXISTING RESIDENTIAL
BUILDINGS TO REMAIN (if applicable): NIA
SQUARE FOOTAGE OF PROPOSED NON-RESIDENTIAL
BUILDINGS (if applicable): NIA
SQUARE FOOTAGE OF EXISTING NON-RESIDENTIAL
BUILDINGS TO REMAIN (if applicable): NIA
NET FLOOR AREA OF NON-RESIDENTIAL BUILDINGS (if
applicable): NIA
NUMBER OF EMPLOYEES TO BE EMPLOYED BY THE
NEW PROJECT (if applicable): NIA
PROJECT VALUE: NIA
IS THE SITE LOCATED IN ANY TYPE OF
ENVIRONMENTALLY CRITICAL AREA, PLEASE INCLUDE
SQUARE FOOTAGE (if applicable):
❑ AQUIFER PROTECTION AREA ONE
.•�"'a� ;�j'11i
❑ AQUIFER PROTECTION AREA TWO
❑ FLOOD HAZARD AREA
sq. ft.
7 GEOLOGIC HAZARD
sq. ft.
7 HABITAT CONSERVATION
sq. ft.
J SHORELINE STREAMS AND LAKES
sq. ft.
LI WETLANDS
sq. ft.
I LEGAL DESCRIPTION OF PROPERTY I
(Attach legal description on separate sheet with the following information included)
SITUATE IN THE QUARTER OF SECTION _, TOWNSHIP RANGE—, IN THE CITY
OF RENTON, KING COUNTY, WASHINGTON.
TYPE OF APPLICATION & FEES
List all land use applications being applied for:
1. 3.
!2
Staff will calculate applicable fees and postage: $
Q
AFFIDAVIT OF OWNERSHIP
I, (Print Namels) I l! e v) 6- "t (A lj #1 P1 , declare that I am (please check one) the current owner of the property
involved in this application or X the authorizAd representative to act for a corporation (please attach proof of authorization) and that the foregoing
statements and answers herein contained and the information herewith are in all respects true and correct to the best of my knowledge and belief.
/ I certify that I know or have satisfactory evidence that Lt—Xx ; tS- a
� ,g signed this instrument and acknowledged it to be his/her/their free and voluntary lact for the
uses and purposes mentioned in the instrument.
(Signature of
(Signature of Owner/Representative)
H:Tile SysISWP - Surfacc Water Projects\SWP-27 - Surface Water Projects (CIP)127-3129 Renton Stormwater Manual11300-S]- 2 -
.•�"'a� ;�j'11i
^-t A.,y f /r
��_
Notary Public in and for 4 State of Washington
S
O
_
W0A\'3 may;
Notary (Print)`t
H:Tile SysISWP - Surfacc Water Projects\SWP-27 - Surface Water Projects (CIP)127-3129 Renton Stormwater Manual11300-S]- 2 -
ROJECT INI+ORMATION (contii
My appointment expires. ( t_, l . l
H:Vile Sys\SWP - Surface Water Prajects\SWP-27 - Surface Water Projects {C[P)%27-3129 Renton Stormwater ]Manual11300-SEPAlntasterapp.doc -3 -
PLANNING DIVISION
WAIV-- OF SUBMITTAL REQU 61MENTS
ruR LAND USE APPLICATIONS
Dra%rt�entiol:Rlan z : ; .�
irrtproverFtent Deferral
Master Application Farm 4
Monument (Qne oer Monurnen7)
Neighborhood Detail Map 4 rjF-
This requirement may be waived by:
1. Property Services Section
2. Public Works Plan Review Section
3. Building Section
1. Planning Section
PROJECT NAME: C)0f i
U10 F-1 s
DATE:
M:1Forms\Planninglwaiverafsubmittalregs.xis 02108
PLANNING DIVISION
WAIVER - = SUBMITTAL REQUIRE :NTS
FOR LAND USE APPLICATIONo
ADnlicant Aareement Statement, rt., -
Inventory of Existing Sites 2 AND 3
Lease Agreement, Draft 2 AND 3
Map of Existing Site Conditions 2 AND 3
Map of View Area 2 AND 3
Photos im ulat ions 2 AND 3
This requirement may be waived by
1. Property Services Section
2_ Public Works Plan Review Section
3. Building Section
4_ Planning Section
PROJECT NAME: j
DATE:
H:1PormskPtanninglwaiverofsubmittalregs.xls 02108
Proposal Summary
The purpose of this proposal is to adopt a new City of Renton Surface Water Design Manual for new
development, redevelopment and construction sites in the City of Renton that are equivalent to the
minimum technical requirements, thresholds and definitions in Appendix I of the Department of
Ecology's Phase II National Pollution Discharge Elimination System (NPDES) Municipal Stormwater
Permit for Western Washington. To meet these new standards, the City proposes to amend City code by
adopting the 2009 King County Surface Water Design Manual (KCSWDM) with City addendums that
contains specific requirements and procedures applicable to the City. In adopting these standards, the
City will regulate all new development, redevelopment and construction sites to control the peak rate,
duration and quality of runoff from all new development, redevelopment and construction sites as
required by the NPDES Permit. Most of the changes to the 2009 KCSWDM are minor; however, this
proposal will apply different flow control standards in certain areas of the City that meet the minimum
requirements in the permit provided they are approved by the Department of Ecology.
The revised storm water standards in this proposal will accomplish the following:
1. Ensure City compliance with the Clean Water Act by adopting stormwater standards that are
equivalent to the minimum requirements of the Department of Ecology's Phase I1 NPDES
Municipal Stormwater Permit.
2. Provide better protection of surface water quality, habitat and other environmental resources by
reducing the amount of erosion and contaminated stormwater runoff entering the City's streams,
lakes, rivers and wetlands.
3. Improve public safety by reducing flooding of public and private property and reducing the
amount of pollutants entering water bodies used for recreational activities such as swimming and
fishing.
4. Provide developers and engineers with greater options through the use of Low Impact
Development techniques and more efficient stormwater facilities to control and treat stormwater
runoff from their sites.
5. Provide uniform drainage standards that will simplify stormwater design, review and permitting
for project proponents, engineers and City staff.
6. Reduces the cumulative impact of lower stormwater standards to City storm water conveyance
infrastructure, which will result in reduced long-term capital improvement costs.
It is anticipated that the adoption of the 2009 King County Surface Water Design Manual and City
addendums will be completed at the earliest by August 16, 2009.
An electronic copy of the 2009 KCSWDM can be found at:
www.kingeounty.gov/cnvironmenttwaterandlandlstormwater/documents/surface-water-design-
manual.aspx
HAFile Sys1SWP -Surface Water Pmjects\SWP-27 -Surface Water Projects (CIP),,27-3124 Renton Stormwater Manual\1300-SEPANProposal
Summary l doclAQtp ri e a
PLANNING DIVISION
ENVIRONMENTAL CHECKLIST
City of Renton Planning Division
1055 South Grady Way, Renton, WA 98057
Phone: 425-430-7200 Fax: 425-430-7231
PURPOSE OF CHECKLIST:
The State Environmental Policy Act (SEPA), Chapter 43.210 RCW, requires all governmental agencies to
consider the environmental impacts of a proposal before making decisions. An Environmental Impact
Statement (EIS) must be prepared for all proposals with probable significant adverse impacts on the
quality of the environment. The purpose of this checklist is to provide information to help you and the
agency identify impacts from your proposal (and to reduce or avoid impacts from the proposal, if it can be
done) and to help the agency decide whether an EIS is required.
INSTRUCTIONS FOR APPLICANTS:
This environmental checklist asks you to describe some basic information about your proposal.
Governmental agencies use this checklist to determine whether the environmental impacts of your
proposal are significant, requiring preparation of an EIS. Answer the questions briefly, with the most
precise information known, or give the best description you can.
You must answer each question accurately and carefully, to the best of your knowledge. In most cases,
you should be able to answer the questions from your own observations or project plans without the need
to hire experts. If you really do not know the answer, or if a question does not apply to your proposal, write
"do not know" or "does not apply". Complete answers to the questions now may avoid unnecessary
delays later.
Some questions ask about governmental regulations, such as zoning, shoreline, and landmark
designations. Answer these questions if you can. If you have problems, the governmental agencies can
assist you.
The checklist questions apply to all parts of your proposal, even if you plan to do them over a period of
time or on different parcels of land. Attach any additional information that will help describe your proposal
or its environmental effects. The agency to which you submit this checklist may ask you to explain your
answers or provide additional information reasonably related to determining if there may be significant
adverse impact.
USE OF CHECKLIST FOR NONPROJECT PROPOSALS:
Complete this checklist for nonproject proposals, even though questions may be answered "does not
apply." IN ADDITION, complete the SUPPLEMENTAL SHEET FOR NONPROJECT ACTIONS (part D).
For nonproject actions (actions involving decisions on policies, plans and programs), the references in the
checklist to the words "project," "applicant," and "property or site" should be read as "proposal,"
"proposer," and "affected geographic area," respectively.
- I - 02/08
A. BACKGROUND
Name of proposed project, if applicable:
Adoption of the 2009 King County Surface Water Design Manual (KCSWDM) with addendums.
2. Name of applicant:
City of Renton - Surface Water Utility
3. Address and phone number of applicant and contact person:
Allen Quynn - 425-430-7247
4. Date checklist prepared:
May 15, 2009
5. Agency requesting checklist:
City of Renton
6. Proposed timing or schedule (including phasing, if applicable):
It is antiepated that the Council will adopt the 2009 KCSWDM with City addendums by August 16,
2009 at the earliest.
7. Do you have any plans for future additions, expansion, or further activity related to or connected
with this proposal? If yes, explain.
Yes, the 2009 KCSWDM with City addendums maybe revised to incorporate future changes to the
NPDES Phase 11 permit as well as future changes to be made by the City or the County.
8. List any environmental information you know about that has been prepared, or will be prepared,
directly related to this proposal.
None known
9. Do you know whether applications are pending for governmental approvals of other proposals
directly affecting the property covered by your proposal? If yes, explain.
No other applications are pending for approval.
10. List any governmental approvals or permits that will be needed for your proposal, if known.
The adoption of the 2004 KCSWDM with City addendums will require the adoption of an ordinance
by the City Council to change City code.
11. Give brief, complete description of your proposal, including the proposed uses and the size of the
project and site.
This proposal is a non project action and consists of revising the City's surface water design
standards for new development, redevelopment and construction sites. City code will be amended to
include the adoption of the 2009 King County Surface Water Design Manual with City addendums
that contains specific requirements and procedures applicable to the City. The purpose of this
proposal is to adopt surface water design standards for new development, redevelopment and
H:1Fi1e Sys1SWP - Surface Water ProjectslSWP-27 - Surface Water Projects (CIP)127-3129 Renton Stormwater Manua111300-
SEPAISEPA envchlst 2.doc\AQtp - 2 - 02108
construction sites that are equivalent to the minimum requirements, technical threshold and
definitions in Appendix 1 of Ecology's NPDES Phase II Permit. In adopting these standards, the City
will regulate all development, redevelopment and construction sites to control the peak rate
discharge, duration and quality of runoff from all new redevelopment, redevelopment and
construction sites as required by the NPDES Permit. In addition, this proposal will apply different
flow control standards in certain areas of the City that will meet the minimum requirements in the
permit, provided they are approved by the Department of Ecology. These revised storm water
standards will provide better protection of environmental resources and reduce flooding of property
within the City.
12. Location of the proposal. Give sufficient information for a person to understand the precise
location of your proposed project, including a street address, if any, and section, township, and
range if known. If a proposal would occur over a range of area, provide the range or boundaries
of the site(s). Provide a legal description, site plan, vicinity map, and topographic map, if
reasonably available. While you should submit any plans required by the agency, you are not
required to duplicate maps or detailed plans submitted with any permit applications related to this
checklist.
This proposal will amend City code that applies to development projects within the City of Renton's
jurisdictional boundaries.
B. ENVIRONMENTAL ELEMENTS
1. EARTH
a. General description of the site (circle one); flat rolling, Gy
, eep slope mountainous,
other
b. What is the steepest slope on the site (approximate percent slope?)
100%
C, What general types of soils are found on the site (for example, clay, sand, gravel, peat,
muck)? If you know the classification of agricultural soils, specify them and note any
prime farmland.
The soil types in Renton vary widely but are dominated by soils derived from glacial till and
glacial outwash.
d. Are there surface indications or history of unstable soils in the immediate vicinity? If so,
describe.
There are areas of unstable soils in the City of Renton. In general, these areas can be found
in the City's 2005 Slide Hazard Map.
e. Describe the purpose, type, and approximate quantities of any filling or grading proposed.
Indicate source of fill.
Does not apply - This is a nonproject action proposal.
f. Could erosion occur as a result of clearing, construction, or use? If so, generally
describe.
Does not apply - This is a nonproject action proposal.
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g. About what percent of the site will be covered with impervious surfaces after project
construction (for example, asphalt or buildings)?
Does not apply - This is a nonproject action proposal.
h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any:
Does not apply - This is a nonproject action proposal.
2. AIR
a. What types of emissions to the air would result from the proposal (i.e., dust, automobile,
odors, industrial wood smoke) during construction and when the project is completed? If
any, generally describe and give approximate quantities if known.
Does not apply - This is a nonproject action proposal.
b. Are there any off-site sources of emission or odor that may affect your proposal? If so,
generally describe.
Does not apply - This is a nonproject action proposal.
c. Proposed measures to reduce or control emissions or other impacts to air, if any:
Does not apply - This is a nonproject action proposal.
3. WATER
a. Surface Water:
1) Is there any surface water body on or in the immediate vicinity of the site (including year-
round and seasonal streams, saltwater, lakes, ponds, wetlands)? If yes, describe type
and provide names. If appropriate, state what stream or river it flows into.
Yes, There are a large number of surface water bodies including rivers and streams, which
are identified in the City's 2008 Streams and Lakes Map.
2) Will the project require any work over, in, or adjacent to (within 200 feet) the described
waters? If yes, please describe and attach available plans.
Does not apply - This is a nonproject action proposal.
3) Estimate the amount of fill and dredge material that would be placed in or removed from
surface water or wetlands and indicate the area of the site that would be affected.
Indicate the source of fill material.
Does not apply - This is a nonproject action proposal.
4) Will the proposal require surface water withdrawals or diversions? Give general
description, purpose, and approximate quantities if known,
Does not apply - This is a nonproject action proposal.
5) Does the proposal lie within a 104 -year flood plain? If so, note location on the site plan.
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Does not apply - This is a nonproject action proposal.
6) Does the proposal involve any discharges of waste materials to surface waters? If so,
describe the type of waste and anticipated volume of discharge.
Does not apply - This is a nonproject action proposal. It should he noted that this proposal
may result in a reduction in pollutant loading to surface water from new development and
redevelopment.
b. Ground Water:
1) Will ground water be withdrawn, or will water be discharged to ground water? Give
general description, purpose, and approximate quantities if known.
Does not apply - This is a nonproject action proposal.
2) Describe waste material that will be discharged into the ground from septic tanks or other
sources, if any (for example: Domestic sewage; industrial, containing the following
chemicals...; agricultural; etc.). Describe the general size of the system, the number of
such systems, the number of houses to be served (if applicable), or the number of
animals or humans the system(s) are expected to serve.
Does not apply - This is a nonproject action proposal.
C. Water Runoff (including storm water):
1) Describe the source of runoff (including storm water) and method of collection and
disposal, if any (include quantities, if known). Where will this water flow? Will this water
flow into other waters, if so, describe.
Does not apply - This is a nonproject action proposal.
2) Could waste material enter ground or surface waters? If so, generally describe.
Does not apply - This is a nonproject action proposal. This proposal will result in a
reduction in pollutant loadings from future development.
d. Proposed measures to reduce or control surface, ground, and runoff water impacts, if
any:
Does not apply - This is a nonproject action proposal. However, the requirements in this
proposal are intended reduce the quantity of pollutant loadings to surface and ground water.
4. PLANTS
a. Check or circle types of vegetation found on the site:
X deciduous tree: alder, maple, aspen, other
X evergreen tree: fir, cedar, pine, other
X shrubs
X grass
X pasture
crop or grain
X wet soil plants: cattail, buttercup, bullrush, skunk cabbage, other
X water plants: water lily, eel grass, milfoil, other
X other types of vegetation
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b. What kind and amount of vegetation will be removed or altered?
Does not apply - This is a nonproject action proposal.
C. List threatened or endangered species known to be on or near the site.
Does not apply - This is a nonproject action proposal.
d. Proposed landscaping, use of native plants, or other measures to preserve or enhance
vegetation on the site, if any:
Does not apply - This is a nonproject action proposal.
5. ANIMALS
a. Circle any birds and animals, which have been observed on or near the site or are known
to be on or near the site:
Birds awl hero ea I son b' other
Mammals: e , bear elk, eav , other r-a[ya+i
Fish: h
ass mo trout erring, shellfish, other
b. List any threatened or endangered species known to be on or near the site.
Does not apply - This is a nonproject action proposal.
C. Is the site part of a migration route? If so, explain
Does not apply - This is a nonproject action proposal.
d. Proposed measures to preserve or enhance wildlife, if any:
Does not apply - This is a nonproject action proposal.
6. ENERGY AND NATURAL RESOURCES
a. What kinds of energy (electric, natural gas, oil, wood stove, solar) will be used to meet the
completed project's energy needs? Describe whether it will be used for heating,
manufacturing, etc.
Does not apply - This is a nonproject action proposal.
b. Would your project affect the potential use of solar energy by adjacent properties? If so,
generally describe.
Does not apply - This is a nonproject action proposal.
c. What kinds of energy conservation features are included in the plans of this proposal?
List other proposed measures to reduce or control energy impacts, if any:
Does not apply - This is a nonproject action proposal.
7. ENVIRONMENTAL HEALTH
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a. Are there any environmental health hazards, including exposure to toxic chemicals, risk
of fire and explosion, spill, or hazardous waste, that could occur as a result of this
proposal? If so, describe.
Does not apply - This is a nonproject action proposal.
1) describe special emergency services that might be required.
Does not apply - This is a nonproject action proposal.
2) Proposed measures to reduce or control environmental health hazards, if any:
Does not apply - This is a nonproject action proposal.
b. Noise
1) What types of noise exist in the area which may affect your project (for example: traffic,
equipment, operation, other)?
Does not apply - This is a nonproject action proposal.
2) What types and levels of noise would be created by or associated with the project on a
short-term or a long-term basis (for example: traffic, construction, operation, other)?
Indicate what hours noise would come from the site.
Does not apply - This is a nonproject action proposal.
3) Proposed measures to reduce or control noise impacts, if any:
Does not apply - This is a nonproject action proposal.
8. LAND AND SHORELINE USE
a. What is the current use of the site and adjacent properties?
The City of Renton has many different land uses including industrial, commercial,
residential and resource conservation.
b. Has the site been used for agriculture? If so, describe.
Historically, Renton had farm land primarily in the Black River Basin Valley; however,
there are no areas in the City that are currently zoned as agricultural.
c. Describe any structures on the site.
Most of the structures in the City of Renton are single family residential homes, commercial
buildings and factories.
d. Will any structures be demolished? If so, what?
Does not apply - This is a nonproject action proposal.
e. What is the current zoning classification of the site?
There are various zoning classifications in the City of Renton including multiple types of
residential, commercial and industrial and mixed use.
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f. What is the current comprehensive plan designation of the site?
This proposal covers the entire City so all comprehensive plan designations apply.
g. If applicable, what is the current shoreline master program designation of the site?
This proposal covers the entire City so all current shoreline master program designations
apply. These designations are urban, conservation and natural.
h. Has any part of the site been classified as an "environmentally sensitive" area? If so,
specify.
Many areas in the City of Renton are considered environmentally sensitive and are
identified in the City's various sensitive area maps.
i. Approximately how many people would reside or work in the completed project?
Does not apply - This is a nonproject action proposal.
j. Approximately how many people would the completed project displace?
Does not apply - This is a nonproject action proposal.
k. Proposed measures to avoid or reduce displacement impacts, if any:
Does not apply - This is a nonproject action proposal.
I. Proposed measures to ensure the proposal is compatible with existing and projected land
uses and plans, if any:
Does not apply - This is a nonproject action proposal.
9. HOUSING
a. Approximately how many units would be provided, if any? Indicate whether high, middle,
or low-income housing.
Does not apply - This is a nonproject action proposal.
b. Approximately how many units, if any, would be eliminated? Indicate whether high,
middle, or low-income housing.
Does not apply - This is a nonproject action proposal.
C. Proposed measures to reduce or control housing impacts, if any:
Does not apply - This is a nonproject action proposal.
10. AESTHETICS
a. What is the tallest height of any proposed structure(s), not including antennas; what is the
principal exterior building material(s) proposed.
Does not apply - This is a nonproject action proposal.
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b. What views in the immediate vicinity would be altered or obstructed?
Does not apply - This is a nonproject action proposal.
C. Proposed measures to reduce or control aesthetic impacts, if any:
Does not apply - This is a nonproject action proposal.
11. LIGHT AND GLARE
a. What type of light or glare will the proposal produce? What time of day would it mainly
occur?
Does not apply - This is a nonproject action proposal.
b. Could light or glare from the finished project be a safety hazard or interfere with views?
Does not apply - This is a nonproject action proposal.
C, What existing off-site sources of light or glare may affect your proposal?
Docs not apply - This is a nonproject action proposal.
d. Proposed measures to reduce or control light and glare impacts, if any:
Does not apply - This is a nonproject action proposal.
12. RECREATION
a. What designated and informal recreational opportunities are in the immediate vicinity?
Does not apply - This is a nonproject action proposal.
b. Would the proposed project displace any existing recreational uses? If so, describe.
Does not apply - This is a nonproject action proposal.
C. Proposed treasures to reduce or control impacts on recreation, including recreation
opportunities to be provided by the project or applicant, if any:
Does not apply - This is a nonproject action proposal.
13. HISTORIC AND CULTURAL PRESERVATION
a. Are there any places or objects listed on, or proposed for, national state, or local
preservation registers known to be on or next to the site? If so, generally describe.
Does not apply - This is a nonproject action proposal.
b. Generally describe any landmarks or evidence of historic, archaeological, scientific, or
cultural importance known to be on or next to the site.
Does not apply - This is a nonproject action proposal.
C. Proposed measures to reduce or control impacts, if any:
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Does not apply - This is a nonproject action proposal.
14. TRANSPORTATION
a. Identify public streets and highways serving the site, and describe proposed access to the
existing street system. Show on site plans, if any.
Does not apply - This is a nonproject action proposal.
b. Is site currently served by public transit? If not, what is the approximate distance to the
nearest transit stop?
Does not apply - This is a nonproject action proposal.
C, How many parking spaces would the completed project have? How many would the
project eliminate?
Does not apply - This is a nonproject action proposal.
d. Will the proposal require any new roads or streets, or improvements to existing roads or
streets, not including driveways? If so, generally describe (indicate whether public or
private?
Does not apply - This is a nonproject action proposal.
e. Will the project use (or occur in the immediate vicinity of) water, rail, or air transportation?
If so, generally describe.
Does not apply - This is a nonproject action proposal.
How many vehicular trips per day would be generated by the completed project? If
known, indicate when peak volumes would occur.
Does not apply - This is a nonproject action proposal.
g. Proposed measures to reduce or control transportation impacts, if any:
Does not apply - This is a nonproject action proposal.
15. PUBLIC SERVICES
a. Would the project result in an increased need for public services (for example: fire
protection, police protection, health care, schools, other)? If so, generally describe.
Does not apply - This is a nonproject action proposal.
b. Proposed measures to reduce or control direct impacts on public services, if any.
Does not apply - This is a nonproject action proposal.
16. UTILITIES
a. Circle utilities currently available at the site: electricity, natural gas, water, refuse service,
telephone, sanitary sewer, septic system, other.
Does not apply - This is a nonproject action proposal.
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Describe the utilities that are proposed for the project, the utility providing the service, and
the general construction activities on the site or in the immediate vicinity which might be
needed.
Does not apply - This is a nonproject action proposal.
C. SIGNATURE
I, the undersigned, state that to the best of my knowledge the above information is true and
complete. It is understood that the lead agency may withdraw any declaration of non -significance
that it might issue in reliance upon this checklist should there be any willful misrepresentation or
willful lack of full disclosure on my part. 4
Proponent
Name Printed:
Date: 5//5/07
ENVCHLST.DOC
REVISED 6/98
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D. SUPPLEMENTAL SHEETS FOR NONPROJECT ACTIONS
(These sheets should only be used for actions involving decisions on policies, plans and
programs. You do not need to fill out these sheets for project actions.)
Because these questions are very general, it may be helpful to read them in conjunction with the
list of the elements of the environment.
When answering these questions, be aware of the extent the proposal, or the types of activities
likely to result from the proposal, would affect the item at a greater intensity or at a faster rate
than if the proposal were not implemented. Respond briefly and in general terms.
How would the proposal be likely to increase discharge to water; emissions to air; production,
storage, or release of toxic or hazardous substances; or production of noise?
This proposal will not result in any increase in these categories. The proposal may result
in a decrease in the rate of stormwater runoff from development projects and a reduction
in pollutants discharged to water bodies within the City.
Proposed measures to avoid or reduce such increases are:
Not applicable.
How would the proposal be likely to affect plants, animals, fish, or marine life?
This proposal will increase protection of plants, animals, fish and marine life by better
controlling runoff which will reduce erosion and associated pollutants to natural receiving
water bodies.
Proposed measures to protect or conserve plants, animals, fish, or marine life are:
Higher detention and water quality treatment standards applied to new development,
redevelopment and construction sites.
How would the proposal be likely to deplete energy or natural resources?
Because the proposal may result in larger stormwater facilities, a slight increase in the
consumption of energy and natural resources may result in the construction and long-
term maintenance of the facilities. However, by controlling stormwater runoff better, the
need to construct conveyance systems, mitigate flooding problems and cleanup pollution
will be reduced and thus, decrease the need for energy and natural resources.
Proposed measures to protect or conserve energy and natural resources are:
This proposal includes the use of technology to improve the flexibility and efficiency of
stormwater facility design that will result in a reduction of land and minimize natural
resources required for construction and materials.
4. How would the proposal be likely to use or affect environmentally sensitive areas or areas
designated (or eligible or under study) for governmental protection; such as parks, wilderness,
wild and scenic rivers, threatened or endangered species habitat, historic or cultural sites,
wetlands, flood plains, or prime farmlands?
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The proposal will have no negative impact on the above-mentioned sensitive areas. Storm
water management facilities will improve the protection of streams, lakes, rivers, wetlands
and floodplains.
Proposed measures to protect such resources or to avoid or reduce impacts are:
Implementation of new storm water standards required under this proposal.
5. How would the proposal be likely to affect land and shoreline use, including whether it would
allow or encourage land or shoreline uses incompatible with existing plans?
This proposal will have no impact on designated use of land or shorelines. The proposal
may require a higher level of flow control and stormwater treatment within the City that will
increase protection of shoreline beneficial uses.
Proposed measures to avoid or reduce shoreline and land use impacts are:
No Impact.
6. How would the proposal be likely to increase demands on transportation or public services and
utilities?
This proposal will have no impact on transportation, public services or utilities.
Proposed measures to reduce or respond to such demand(s) are:
Not applicable.
7. Identify, if possible, whether the proposal may conflict with local, state, or federal laws or
requirements for the protection of the environment.
This proposal does not conflict with local, state or federal laws. This proposal is a
requirement of the City's NPDES Phase II Municipal Stormwater Permit which requires the
City to adopt surface water design standards equivalent to the minimum requirements in
the Department of Ecology's 2005 Stormwater Management Manual for Western
Washington.
SIGNATURE
I, the undersigned, state that to the best of my knowledge the above information is true and
complete. It is understood that the lead ag cy may withdraw any declaration of non -significance
that it might issue in reliance upon this c cklist should there be any willful misrepresentation or
willful lack of full disclosure on my part. /
Proponent:
Name Printed:
Date: 511/ of I
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Manua111300-SEPA1Supplemental D.doclAQtp
/�' O FINANCE AND INFORMATION SERVICES
■�:-R
♦ DEPARTMENT
=�
lU M MOV IMMINI ►W1iMu I
DATE: May 14, 2009
TO: Sue Olson, Finance & Information Services Department
FROM: Allen Quynn, Surface Water Utility (ext. 7247)
SUBJECT: Re: INTERFUND TRANSFER REQUEST
Instructions: Please note that failure to provide all digits will result in processing
delays. All Signatures and correct documentation must be included.
Please prepare the followin inter -fiord transfer:
Dennrtment Charged'
Account Number
Project, function, task,
sub -task
Description
Amount
427.000000.018.5950.0038.63.000000
U652411040.0000.0000
SEPA checklist fees for
Surface Water Design
Manual update
$400
Total
$400
ie
t Authorization*
APPROVAL SIGNATURE:
Printed Name Ron
M k] 01111 d
Surface WaterUility Engineering_ Sup. Date May 14, 2009
Account Number
Project, function, task, sub -task
Description
Amount
000.345.81.00.0007
T- Cd SO i Q
Environmental Review
for Surface Water Design
Manual Update
$400
Total
$400
Reason:
SEPA fee for City of Renton review of Surface Water Design Manual Update
Note: Documentation to support this transfer request must be attached and all signatures are required.
Cash Transfer Form/Finance/bh Revised 01149
CITY OF PENTON
1055 S. Grady Way
Renton, WA 98055
Printed: 05-29-2009
Land Use Actions
RECEIPT *'
Permit#: LUA09-061
Payment Made: 05/29/2009 04:17 PM Receipt Number: R0902169
Total Payment: 400.00
Current Payment Made to the Following Items:
Payee: IOT FROM SURFACE WATER
Trans Account Code Description Amount
5010 000.345.81.00.0007 Environmental Review 400.00
Payments made for this receipt
Trans Method Description Amount
---------- -------- ---------------------------- ---------------
Payment IOT 400.00
Account Balances
Trans
Account Code
Description
Balance Due
3021
303.000.00.345.85
Park Mitigation Fee
.00
5006
000.345.81.00.0002
Annexation Fees
00
5007
000.345.81.00.0003
Appeals/Waivers
.00
5008
000.345.61.00.0004
Binding Site/Short Plat
.00
5009
000.345.81.00.0006
Conditional Use Fees
.00
5010
000.345.81.00.0007
Environmental Review
.00
5011
000.345.81.00.0008
Prelim/Tentative Plat
.00
5012
000.345.81.00.0009
Final Plat
.00
5013
000.345.81.00.0010
PUD
.00
5014
000.345.81.00.0011
Grading & Filling Fees
.00
5015
000.345.81.00.0012
Lot Line Adjustment
.00
5016
000.345.81.00.0013
Mobile Home Parks
.00
5017
000.345.61.00.0014
Rezone
.00
5018
000.345.81.00.0015
Routine Vegetation Mgmt
.00
5019
000.345.81.00.0016
Shoreline Subst Dev
.00
5020
000.345.81.00.0017
Site Plan Approval
.00
5021
000.345.81.00.0018
Temp Use, Hobbyk, Fence
.00
5022
000.345.81.00.0019
Variance Fees
.00
5024
000.345.81.00.0024
Conditional Approval Fee
.00
5036
000.345.81.00.0005
Comprehensive Plan Amend
.00
5909
000.341.60.00.0024
Booklets/EIS/Copies
.00
5941
000.341.50.00.0000
Maps (Taxable)
.00
5954
650.237.00.00.0000
DO NOT USE - USE 3954
.00
5955
000.05.519.90.42.1
Postage
.00
5998
000.231.70.00.0000
Tax
.00
Remaining Balance Due: $0.00