HomeMy WebLinkAboutPermit PL10-052 - SABEY / VINCENT ANTHONY - FILL PROJECT / SEPASABEY
ANTHONY VINCENT
10230 E MARGINAL WAY S
PLI 0-052
E10-015
SEPA ENVIRONMENTAL IMPACT STATEMENTS (EIS)
City of4Pukwila •
Department of Community Development
6300 Southcenter Boulevard, Suite # 100
Tukwila, Washington 98188
Phone: 206-431-3670
Fax: 206-431-3665
Web site: http://www.ci.tukwila.wa.us
File Number:
Applied:
Issue Date:
Status:
DETERMINATION OF NON -SIGNIFICANCE (DNS)
E10-015
09/10/2010
11/19/2010
APPROVED
kpplicant: VINCENT, ANTHONY
Lead Agency: City of Tukwila
)escription of Proposal:
3abey Construction is proposing to bring in approximately 40,000 cubic yards of fill material to
evel off of their site along East Marginal Way South. The site consists of the following King
3ounty Parcels, 042304-9102, 02304-9062 (located in the City of Seattle), and 042304-9015. The
)roposed fill material is coming from the excavation associated with Sound Transit Light Rail
project in Capitial Hill. The fill material will be used to level the site and prepare for possible
uture development.
'ortions of the project site are located within both the cities of Tukwila and Seattle. The City of
Pukwila is conducting an environmental review only for the portion of the project located within
he City of Tukwila. If the applicant intends to place fill in the City of Seattle, additional
mvironmental information may be required from the City of Seattle.
jocation of Proposal:
Address: 10230 EAST MARGINAL WY S TUKW
Parcel Number: 0423049015
Section/Township/Range:
['he City has determined that the proposal does not have a probable significant adverse impact on the environment. An environmental
mpact statement (EIS) is not required under RCW 43.21c.030(2) (c). This decision was made after review of a completed environmental
:hecklist and other information on file with the lead agency. This information is available to the public on request.
['his DNS is issued under the option DNS process in WAC 197-11-355. There is no further comment period.
ack Pac , Responsible Official
of Tukwila
3300 Southcenter Blvd
Pukwila, WA 98188
206)431-3670
Au , X01
Date
O
any appeal shall be linked to a specific governmental action. The State Environmental Policy Act is not intended to create a cause of action
inrelated to a specific governmental action. Appeals of environmental determinations shall be commenced within the time period to
tppeal the governmental action that is subject to environmental review. (RCW 43.21C.075)
loc: DNSOP-8/07
E10-015 Printed: 11-18-2010
•
NL7G1\‘.. i LMDCL.7
•
( ) US Corps of Engineers
( ) Federal HWY Admin
( ) Federal Transit Admin, Region 10
( ) Dept of Fish & Wildlife
Section 1 FEDERAL AGENCIES
( ) US Environmental Protection Agency (E.P.A.)
( )US Dept of HUD
( ) National Marine Fisheries Service
Section 2 WASHINGTON STATE AGENCIES
( ) Office of Archaeology
( ) Transportation Department (WSDOT NW)
( ) Dept of Natural Resources
( ) Office of the Governor
( ) WA State Community Development
( ) WA Fisheries & Wildlife
( ) Dept of Social & Health Services
.( ) Dept of Ecology NW Regional Office, Shoreland Division
Nept of Ecology, SEPA
ffice of Attorney General
( ) Office of Hearing Examiner
( ) KC Boundary Review Board
( ) Fire District # 11
( ) Fire District # 2
( ) KC Wastewater Treatment Div
( ) KC Dept of Parks & Recreation
( ) KC Assessor's Office
Section 3 KING COUNTY AGENCIES
( ) Health Department
( ) Port of Seattle
( ) KC Dev & Enviro Services-SEPA Info Center
( ) KC Metro Transit Div-SEPA Official, Environmental Planning
( ) KC Dept of Natural Resources
( ) KC Dept of Natural Resources, Andy Levesque
( ) Tukwila School District
( ) Tukwila Library
( ) Renton Library
( ) Kent Library
( ) Seattle Library
Section 4 SCHOOLS/LIBRARIES
( ) Foster Library
( ) KC Public Library System
( ) Highline School District
( ) Seattle School District
( ) Renton School District
( ) Westfield Mall Library
( ) QWEST Communications
( ) Seattle City Light
( ) Puget Sound Energy
( ) Highline Water District
( ) Seattle Planning &Dev/Water Dept
( ) Comcast
Section 5 UTILITIES
( ) BP Olympic Pipeline
( ) Val-Vue Sewer District
( ) Water District # 20
( ) Water District # 125
( ) City of Renton Public Works
( ) Bryn Mawr-Lakeridge Sewer/Water Dist
( ) Seattle Public Utilities
( ) Allied Waste Services
( ) Tukwila City Departments
( ) Public Works ( ) Fire
( ) Police ( ) Finance
( ) Planning ( ) Building
( ) Parks & Rec ( ) Mayor
( ) City Clerk
Section 6 CITY AGENCIES
( ) Kent Planning Dept
( ) Renton Planning Dept
( ) City of SeaTac
( ) City of Burien
( ) City of Seattle
( ) Strategic Planning *Notice of all Seattle Related Projects
( ) Puget Sound Regional Council
( ) SW KC Chamber of Commerce
( ) Muckleshoot Indian Tribe *
( ) Cultural Resources
( ) Fisheries Program
( ) Wildlife Program
( ) Duwamish Indian Tribe *
Section 7 OTHER LOCAL AGENCIES
( ) Puget Sound Clean Air Agency
( ) Sound Transit/SEPA
( ) Duwamish River Clean Up Coalition *
( ) Washington Environmental Council
( ) People for Puget Sound *
( ) Futurewise
* send notice of all applications on Green/Duwamish River
( ) Seattle Times
( ) South County Journal
Section 8 MEDIA
( ) Highline Times
( ) City of Tukwila Website
P:Admin\Admin Forms\Agency Checklist
•
Public Notice Mailinos For Permit
SEPA MAILINGS
Mail to: (comment period starts on date of mailing)
Dept. of Ecology Environmental Review Section
*Applicant
*Other agencies as necessary (checked off on attached list)
*Any parties of record
* send only the staff report, site plan and the SEPA Determination
KC Transit Division — SEPA Official would like to receive information about all projects that might affect transit demand
Tribes — For any application on the Green/Duwamish River, send the checklist and a full set of plans with the Notice Of Application
Send These Documents to DOE:
SEPA Determination (3 -part from Sierra)
Findings (staff report, usu. with MDNS)
SEPA Checklist (filled out by applicant)
Drawings/Plans of project (site plan, elevations, etc. from PMT's)
Affidavit of Distribution (notice was mailed or sent to newspaper)
SHORELINE MAILINGS:
Notice of Application for a Substantial Development Permit must be mailed to owners and to property owners within 500 feet of
subject property, comments are due 30 days after the notice of application is mailed/posted. The Notice of Application for Shoreline
Substantial Development Permit must include a statement that any person desiring to submit written comments on the application or
desiring to receive notification of the final decision on the application may do so within 30 days of the Notice of Application. If a
hearing will be held on the application, the hearing notice must include the information that written comments may be submitted, or
oral presentation made at the hearing. Notice is sent to Ecology's NW Regional Office Shorelands & Environmental Assistance
Program.
Shoreline Permit Notice of Decision:
Mail to: (within 8 days of decision; 21 -day appeal period begins date received by DOE)
Department of Ecology Shorelands Section, NW Regional Office.
State Attorney General
*Applicant
*Indian Tribes
*Other agencies as necessary (checked off on attached list).
*Any parties of record
* send only the staff report, site plan and the SEPA Determination
Send These Documents to DOE and Attorney General:
Permit Data Sheet
Shoreline Substantial Development Permit (3 -part from Sierra)
Findings (staff report or memo)
Shoreline Permit Application Form (filled out by applicant)
Drawings/Plans of project (site plan, elevations, etc. from PMT's)
- Site plan, with mean high water mark & improvements
— Cross-sections of site with structures & shoreline
- Grading Plan
— Vicinity map
SEPA determination (3 -part from Sierra)
Findings (staff report or memo)
SEPA Checklist (filled out by applicant)
Any background studies related to impacts on shoreline
Notice of Application
Affidavit of Distribution (notice was mailed)
P:Admin\Admin Forms\Agency Checklist
•
MEMORANDUM
To: Jack Pace, Director
From: Brandon Miles, Senior Planner
Date: November 8, 2010
Re: Sabey Fill Project, 10230 East Marginal Way S
(E10-015)
Project Description:
Sabey Construction is proposing to bring in approximately 40,000 cubic yards of fill material to level
off of their site along East Marginal Way South. The site consists of the following King County
Parcels, 042304-9102, 02304-9062 (located in the City of Seattle), and 042304-9015. The proposed
fill material is coming from the excavation associated with Sound Transit Light Rail project in
Capitial Hill. The fill material will be used to level the site and prepare for possible future
development.
Portions of the project site are located within both the cities of Tukwila and Seattle. The City of
Tukwila is conducting an environmental review only for the portion of the project located within the
City of Tukwila. If the applicant intends to place fill in the City of Seattle, additional environmental
information may be required from the City of Seattle.
Agencies with Jurisdiction:
City of Tukwila
City of Seattle
Washington State Department of Ecology
Notification:
On October 5, 2010 a Notice of Application was mailed to tenants and property owners within 500
feet of the project. A Notice of Application was also posted on the site.
Other Required Permits:
Public Works Permit
Summary of Primary Impacts:
Earth
City of Tukwila
Brandon Miles Page 1
H:\Developments\Sabey, Fill\sepa-staffrpt.doc
11/18/2010
•
•
The SEPA checklist notes that the site has an elevation below the elevation of surrounding
properties. The goal of the proposed project is to remedy the grade differences by bringing
the project site to the same level as surrounding properties. Approximately, 40,000 cubic
yards of fill will be imported to the site form the U -Link project on Capital Hill. The
applicant has noted that the proposed fill material is clean and free from containments. The
project does not involve the installation of any impervious surfaces.
A Temporary Erosion Control Plan will be in place during the project in order to reduce and
control erosion.
•Air
Concur with checklist. Best management practices will be implemented during construction
activities to reduce and control dust and air emissions.
• Water
The Duwamish River is located just over 200 feet from the project site and thus the project is
not subject to a Shoreline Permit. Additionally, the site has not been identified as part of a
floodway or floodplain. There will be no disruption of ground water as part of the project.
As part of the project, the applicant provided a Storm Water Pollution Prevention Plan, dated
September 7, 2010, prepared by David Evans and Associates (hereinafter, Report). As noted
on page of the report, the goal of the report is threefold:
1. Discuss BMPs to prevent erosion and sedimentation during construction activities
(i.e. bringing in the fill);
2. Prevent violations of surface water quality, ground water quality, sediment
management standards; and
3. During the construction phase prevent adverse water quality impacts including
impacts on beneficial uses of the receiving water by controlling peak flow rates and
volumes of storm water run-off at the Permitee's outfalls and downstream of outfalls.
The applicant notes in the SEPA checklist, "...[T]he site will be left at grades that will allow for
continued infiltration with no stormwater leaving the site". The fact that no storm water is leaving
the site is an important element of this project. Since the site is over an acre in size, it would be
required to obtain a permit from DOE for the proposed fill project; however a DOE permit is not
required if 100% of storm water on the site does in fact infiltrate.
During construction temporary storage/infiltration areas will be utilized to reduce storm water run-off
associated with the actual grading work.
Plants
Concur with checklist.
Animals
B. Miles 2
H:\Developments\Sabey, Fill\sepa-staffrpt.doc
Concur with checklist. Contrary to the SEPA Checklist, the project area is located within a
migration area. The entire region is part of the Pacific Flyway, a primary corridor for bird
species. The Duwamish River, located nearby, is home to salmon and other migrating fish
species.
• Energy/Natural Resources
Concur with checklist.
• Environmental Health
Noise from the project will be short term and will be associated with heavy construction equipment.
The project
Land/Shoreline Use
The project site is zoned Light Industrial (LI). While this portion of the site is vacant, the parcels
included in this SEPA application are part of the larger Unified Grocers Site. Unified Grocers
operates a warehouse and distribution operation on the project site. The existing Unified Grocers
operation will not be impacted by the proposed fill project.
The site is not located along a shoreline of statewide significance; however the Duwamish River is
located nearby.
The project is a fill only project, any future uses on the site would be subject to review by the City
and compliance with applicable development regulations.
• Housing
N/A, Concur with checklist.
• Aesthetics
No structures are proposed with the proposed fill project.
• Light and Glare
Concur with checklist
• Recreation
The Museum of Flight is located north of the proposed project site along East Marginal Way South.
Additionally, a trail system is in placed along the Duwamish River. There be no impacts to either of
these existing recreation uses.
• Historic and Cultural Preservation
No known places or landmarks exist within the project area. Since the project involves fill and
grading and not cutting of material the likelihood of disturbing archaeological remains is low.
B. Miles 3
H:1Developments\Sabey, Fill\sepa-staffipt.doc
During construction if any landmarks or evident of historical, archaeological, scientific, or cultural
importance are found on the site, work will stop immediately and the contractor will notify the City
of Tukwila, Washington State Office of Archeology, and the Muckleshoot Indian Tribe.
Transportation
Concur with checklist. The project will generate a considerable amount of truck traffic when the fill
material is brought to the site. The applicant is required to obtain a hauling permit for the truck
traffic. No trips will be generated upon completion of the project.
B. Miles 4
H:\Developments\Sabey, Fill\sepa-staffrpt.doc
• Public Services
Concur with checklist.
• Utilities
N/A
Comments
No comments were received during the Notice of Application period.
Recommendation:
Determination of Non -Significance
B. Miles 5
H:\Developments\Sabey, Fill\sepa-staffrpt.doc
City of Tukwila Notice of Application
Sabey Construction
SEPA determination
Location: 10230 East Marginal Way S
File #'s: E10-015 (SEPA)
Applicant: Sabey Construction
Property Owner: HAAPLA & HAAPLA
Project Planner: Brandon Miles, 206-431-3684
Project Description: Sabey Construction is proposing to
import approximately 40,000 cubic yards of fill material in
order to raise the grade of the site.
Tukwila has reviewed the project for probable adverse environ-
mental impacts and expects to issue a determination of non-
significance (DNS). The optional DNS process in WAC 197-
11-35 is being used. There will be a single integrated comment
period for the land use permits and the environmental review so
this may be your only opportunity to comment on the environ-
mental impacts of the project. If timely comments do not iden-
tify probable significant adverse impacts th were not consid-
ered by the anticipated determination the F $ will be issued
without a second comment period.
Comments and Appeals: Your written p hrments on the
project are requested and can be delivered 6 DCD, 6300
Southcenter Blvd., Ste 100. Comments must be received by
5:OOpm on October 19, 2010. You may request a copy of any
decision, information on hearings, and your appeal rights by
calling 206-431-3684
You are receiving this notice because you are a property owner or tenant within 500ft of this project.
sr at* of Jui wiea •
Department Of Community Development
AFFIDAVIT OF DISTRIBUTION
I, _
rev 'sved J 4 HEREBY
DECLARE THAT:
Notice of Public Hearing
Determination of Non -Significance
Project Name: Sabey Fill 10230 East Marginal Way South
Notice of Public Meeting
Mitigated Determination of Non -
Significance
Board of Adjustment Agenda
Packet
Determination of Significance &
Scoping Notice
Board of Appeals Agenda
Packet
Notice of Action
Planning Commission
Agenda Packet
Official Notice
Short Subdivision Agenda
Notice of Application
Shoreline Mgmt Permit
Notice of Application for Shoreline
Mgmt Permit
_
_
FAX To Seattle Times
Classifieds
Mail: Gail Muller Classifieds
PO Box 70 - Seattle WA
98111
Other:
Was mailed to each of the addresses listed/attached
on this Stivday of _ October in the year 2010
W:\USERS\TERI\AFFIDAVIT OF DISTRIBUTION.DOC
Project Name: Sabey Fill 10230 East Marginal Way South
Project Number: E10-015
Mailing requested by: Brandon Miles
Mailer's signature:
akf (IC
W:\USERS\TERI\AFFIDAVIT OF DISTRIBUTION.DOC
( ) US Corps of Engineers
( ) Federal HWY Admin
( ) Federal Transit Admin, Region 10
( ) Dept of Fish & Wildlife
Section 1 FEDERAL AGENCIES
( ) US Environmental Protection Agency (E.P.A.)
( )US Dept of HUD
( ) National Marine Fisheries Service
-(\) Office of Archaeology
(1) Transportation Department (WSDOT NW)
( ) Dept of Natural Resources
( ) Office of the Governor
( ) WA State Community Development
WA Fisheries & Wildlife
Section 2
WASHINGTON STATE AGENCIES
( ) Dept of Social & Health Services
onal Office, Shoreland Division
(
( ) Office of Hearing Examiner
Dept of Ecology, SEPA
eneral
( ) KC Boundary Review Board
( ) Fire District # 11
( ) Fire District # 2
(.) KC Wastewater Treatment Div
( ) KC Dept of Parks & Recreation
\.) KC Assessor's Office
Section 3 KING COUNTY AGENCIES
( ) Health Department
Port of Seattle
( J KC Dev & Enviro Services-SEPA Info Center
( ) KC Metro Transit Div-SEPA Official, Environmental Planning
( ) KC Dept of Natural Resources
( ) KC Dept of Natural Resources, Andy Levesque
( ) Tukwila School District
( ) Tukwila Library
( ) Renton Library
( ) Kent Library
( ) Seattle Library
Section 4 SCHOOLS/LIBRARIES
( ) Foster Library
( ) KC Public Library System
( ) Highline School District
( ) Seattle School District
( ) Renton School District
( ) Westfield Mall Library
( ) QWEST Communications
( ) Seattle City Light
( ) Puget Sound Energy
( ) Highline Water District
Seattle Planning &Dev/Water Dept
)'€omcast
Section 5 UTILITIES
( ) BP Olympic Pipeline
( ) Val-Vue Sewer District
( ) Water District # 20
( ) Water District # 125
( ) City of Renton Public Works
( ) Bryn Mawr-Lakeridge Sewer/Water Dist
\\s ) Seattle Public Utilities
( Allied Waste Services
( ) Tukwila City Departments
( ) Public Works
( ) Police
( ) Planning
( ) Parks & Rec
( ) City Clerk
( ) Fire
( ) Finance
( ) Building
( ) Mayor
Section 6 CITY AGENCIES
( ) Kent Planning Dept
( ) Renton Planning Dept
( ) City of SeaTac
( ) City of Burien
City of Seattle
( ) Strategic Planning *Notice of all Seattle Related Projects
( ) Puget Sound Regional Council
) SW KC Chamber of Commerce
uckleshoot Indian Tribe *
Cultural Resources
( ) Fisheries Program
( ) Wildlife Program
( ) Duwamish Indian Tribe *
Section 7 OTHER LOCAL AGENCIES
Puget Sound Clean Air Agency
Sound Transit/SEPA
( )Duwamish River Clean Up Coalition *
( ) Washington Environmental Council
( ) People for Puget Sound *
( ) Futurewise
* send notice of all applications on Green/Duwamish River
( ) Seattle Times
( ) South County Journal
Section 8 MEDIA
( ) Highline Times
( ) City of Tukwila Website
P:Admin\Admin Forms\Agency Checklist
SEPA MAILINGS
ruouc nonce rgaumgs ror rermiis�
•
Mail to: (comment period starts on date of mailing)
Dept. of Ecolociv Environmental Review Section
*Applicant
*Other agencies as necessary (checked off on attached list)
*Any parties of record
* send only the staff report, site plan and the SEPA Determination
KC Transit Division — SEPA Official would like to receive information about all projects that might affect transit demand
Tribes — For any application on the Green/Duwamish River, send the checklist and a full set of plans with the Notice Of Application
Send These Documents to DOE:
SEPA Determination (3 -part from Sierra)
Findings (staff report, usu. with MDNS)
SEPA Checklist (filled out by applicant)
Drawings/Plans of project (site plan, elevations, etc. from PMT's)
Affidavit of Distribution (notice was mailed or sent to newspaper)
SHORELINE MAILINGS:
Notice of Application for a Substantial Development Permit must be mailed to owners and to property owners within 500 feet of
subject property, comments are due 30 days after the notice of application is mailed/posted. The Notice of Application for Shoreline
Substantial Development Permit must include a statement that any person desiring to submit written comments on the application or
desiring to receive notification of the final decision on the application may do so within 30 days of the Notice of Application. If a
hearing will be held on the application, the hearing notice must include the information that written comments may be submitted, or
oral presentation made at the hearing. Notice is sent to Ecology's NW Regional Office Shorelands & Environmental Assistance
Program.
Shoreline Permit Notice of Decision:
Mail to: (within 8 days of decision; 21 -day appeal period begins date received by DOE)
Department of Ecology Shorelands Section, NW Regional Office
State Attorney General
*Applicant
*Indian Tribes
*Other agencies as necessary (checked off on attached list).
*Any parties of record
* send only the staff report, site plan and the SEPA Determination
Send These Documents to DOE and Attorney General:
Permit Data Sheet
Shoreline Substantial Development Permit (3 -part from Sierra)
Findings (staff report or memo)
Shoreline Permit Application Form (filled out by applicant)
Drawings/Plans of project (site plan, elevations, etc. from PMT's)
- Site plan, with mean high water mark & improvements
— Cross-sections of site with structures & shoreline
- Grading Plan
— Vicinity map
SEPA determination (3 -part from Sierra)
Findings (staff report or memo)
SEPA Checklist (filled out by applicant)
Any background studies related to impacts on shoreline
Notice of Application
Affidavit of Distribution (notice was mailed)
P:Admin\Admin Forms\Agency Checklist
E10-015 / PL10-052
TUKWILA COMMUNITY MEMBER
TUKWILA COMMUNITY MEMBER
TUKWILA COMMUNITY MEMBER
TUKWILA COMMUNITY MEMBER
TUKWILA COMMUNITY MEMBER
CHASE PROPERTY MANAGEMENT L
TUKWILA COMMUNITY MEMBER
TUKWILA COMMUNITY MEMBER
BUTY LP
3301 SOUTH NORFOLK LLC
10230 EAST MARGINAL LLC
MASSA,BOB
ROACH,JOHN S
MICHIGAN PROPERTIES
EAST MARGINAL ASSOCIATES
BOEING COMPANY
VINCENT ANTHONY
10008 E MARGINAL WAY S
10016 E MARGINAL WAY S
10035 E MARGINAL WAY S
10200 E MARGINAL WAY S
10230 E MARGINAL WAY S
10315 E MARGINAL WAY S
10320 E MARGINAL WAY S
10325 E MARGINAL WAY S
1150 ALKI AVE SW 4
12201 TUKWILA INTERNATIONAL BLVD
12201 TUKWILA INTERNATIONAL BLVD 4TH -FL
372 S REYNOLDS RD
3720 80TH AVE SE
5301 2ND AVE S
700 N 36TH ST
PO BOX 3707
12201 TUKWILA INTERNATIONAL BLVD
TUKWILA
TUKWILA
TUKWILA
TUKWILA
SEATTLE
TUKWILA
TUKWILA
TUKWILA
SEATTLE
TUKWILA
TUKWILA
OTHELLO
MERCER ISLAND
SEATTLE
SEATTLE
SEATTLE
TUKWILA
WA
WA
WA
WA
WA
WA
WA
WA
WA
WA
WA
WA
WA
WA
WA
WA
WA
98168
98168
98168
98168
98168
98168
98168
98168
98116
98168
98168
99344 •
98040
98108
98103
98124
98168
•
CITY OF TUKWILA
NOTICE OF APPLICATION
PROJECT INFORMATION
Sabey Construction is proposing to import approximately 40,000 cubic yards of fill material to the
to a 3.3 acre site near 10230 East Marginal Way South. The purpose of the fill is to level the site
off for possible future development. No current development plans are pending with the City. The
source of the fill material is from the Sound Transit Light Rail Dig in Capital Hill (Seattle).
Projects applied for include: None
Other known required permits include: Public Works Permit for Grading Activities
Studies required with the applications include: Storm Water Pollution Prevention Plan
An environmental checklist has been submitted with the study identified above.
FILES AVAILABLE FOR PUBLIC REVIEW
The project files are available at the City of Tukwila. To view the files, you may request
them at the counter at the Department of Community Development (DCD), located at
6300 Southcenter Boulevard #100.
OPPORTUNITY FOR PUBLIC COMMENT
Your written comments on the project are requested. They must be delivered to DCD at
the address above or postmarked no later than 5:00 P.M., October 19, 2010.
Tukwila has reviewed the project for probable adverse environmental impacts and
expects to issue a determination of non -significance (DNS). The optional DNS process in
WAC 197-11-35 is being used. There will be a single integrated comment period for the
land use permits and the environmental review so this may be your only opportunity to
comment on the environmental impacts of the project. If timely comments do not identify
probable significant adverse impacts that were not considered by the anticipated
determination the DNS will be issued without a second comment period.
APPEALS
You may request a copy of any decision, information on hearings, and your appeal rights
by calling DCD at (206) 431-3670.
The Public Works permit may be appealed to the City's Hearing Examiner.
For further information on this proposal, contact Brandon Miles at (206) 431-3670 or visit
our offices at 6300 Southcenter Boulevard, Suite #100, Monday through Friday, 8:30 a.m.
to 5:00 p.m.
Application Filed: September 10, 2010
Notice of Completeness Issued: October 1, 2010
Notice of Application Issued: October 5, 2010
October 5, 2010
City of Tukwila
Jim Haggerton, Mayor
Department of Community Development Jack Pace, Director
VINCENT ANTHONY
Sabey Construction
12201 Tukwila Intl Blvd
Tukwila WA 98168
RE: Notice of Application,
Fill, 10230 E Marginal Way S
E10-015, SEPA
Dear Mr. Anthony:
There is a fee due on your permit application in the amount of $16.00 to cover mailing the attached public
notice. The number of required notices sent for your application was 16 which included property owners
and tenants within 500 feet of your project site as well as interested parties and agencies with jurisdiction.
The cost is based on the land use fee schedule adopted by Resolution Number 1718 covering Public
Notice mailings required for your application. This fee covers the attached notice only. Additional fees
may be assessed for future mailings or other review tasks per the fee schedule.
This amount needs to be paid before the city can continue processing your permit application. The
payment may be paid by cash, check or credit card. The city will accept credit card payments by phone.
If paying by check please send the check made out to:
City of Tukwila
6300 Southcenter Blvd, Ste 100
Tukwila, WA 98188
If payment is not received within 15 days of this notice your permit application may be put on hold.
If you have any questions, please feel free to contact me at 206 431 3670.
Sincerely,
Teri Svedahl
Administrative Support Technician
MD
Invoicing Public Mailings.doc
Page 1 of 1 10/04/2010
6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • Phone 206-431-3670 • Fax: 206-431-3665
TO:
Development Review Supplemental Memorandum
Public Works Development Review Staff
Fire Development Review Staff
Building Development Review
FROM: Brandon J. Miles, Senior Planner
DATE: September 23, 2010
RE: Sabey Fill Project
Project Description
Sabey Construction is proposing to bring in approximately 40,000 cubic yards of fill
material at 10230 East Marginal Way South. The fill material is coming from the Sound
Transit Light Rail dig on Capital Hill in Seattle.
Notes to Development Review Team
o Please provide any comments by October 7, 2010 regarding the proposed
project. This maybe your only opportunity to review or provide comments on this
project. Please list any additional permits or requirements that you Department
may impose on the project. Any condition should be supported by applicable
code citations.
o Remember to track you time to permits plus.
Thanks.
a•
City of Tukwila
Department of Community Development
File Number
Zk9-- 143 -504
LAND USE PERMIT ROUTING FORM
TO:Building Planning
Public Works
Fire Dept. n Police Dept. 0 Parks/Rec
Project:
,�
C9j1ri.. C ‘, 11
Address:
i 0D-53 ice' ,l`"ui,,�
11 1 D --)I (1
tht 5
Response
requested by:
Date
transmitted:
Staff
coordinator:
.
M +ICj
Date response
received:
REVIEWERS: Please specify how the attached plans conflict with your ADOPTED
development regulations, including citations. Be specific in describing the types of changes you
want made to the plans. When referencing codes, please identify the actual requirement and
plan change needed.
The Planning Division review does not supplant each department's ability to administer its own
regulations and permits. However, project consistency at the Planning review stage is
important to minimize significant later design changes. More than minimal design changes
require further Planning Commission review, even if alteration is required to satisfy a City
requirement. This further review is typically a minimum 60 -day process.
Requirements based on SEPA (e.g., not required by an adopted development regulation)
MUST identify the impact being mitigated, the policy basis for requiring mitigation, and the
method used to calculate the mitigation required. Calculations of project impacts and the
mitigation required (e.g., water capacity, road level of service analyses, or turning analyses)
may be required of the applicant.
5C( vhon3
COMMENTS
(Attach additional comment sheets and/or support materials as needed.)
6-\,6 CJ
Plan check date: 1 t
Ok 1 q 1 b
CommentsUpdate
prepared by: �\
date:
City of Tukwila
Department of Community Development
File Number
PL 9.
ik9- )i 5 --5 -
LAND USE PERMIT ROUTING FORM
TO: "\Building Ion Planning Public Works \F.ire Dept. n Police Dept. n Parks/Rec
Project: --)61
c 9iA til ri.c..1171
r,
prepared by:
Address:
' 013) i k
"' A„
�
'� yt 1
Uf, 1 '
Response
requested by:
Date
transmitted:
11 1 D--), i1
Staff
coordinator:
laDate
I), rill C1
response
received:
REVIEWERS: Please specify how the attached plans conflict with your ADOPTED
development regulations, including citations. Be specific in describing the types of changes you
want made to the plans. When referencing codes, please identify the actual requirement and
plan change needed.
The Planning Division review does not supplant each department's ability to administer its own
regulations and permits. However, project consistency at the Planning review stage is
important to minimize significant later design changes. More than minimal design changes
require further Planning Commission review, even if alteration is required to satisfy a City
requirement. This further review is typically a minimum 60 -day process.
Requirements based on SEPA (e.g., not required by an adopted development regulation)
MUST identify the impact being mitigated, the policy basis for requiring mitigation, and the
method used to calculate the mitigation required. Calculations of project impacts and the
mitigation required (e.g., water capacity, road level of service analyses, or turning analyses)
may be required of the applicant.
COMMENTS
(Attach additional comment sheets and/or support materials as needed.)
5ce tiNni
/(% et. 71
O7
Plan check date:
9—�A- /6
Comments
Update date:
prepared by:
•
City of Tukwila
Department of Community Development
RECEIVED
SEP 23 YU1U
PUBLIC
LAND USE PERMIT ROUTING FORM
File Number
it \ 9-
ZAc �i 5 -`504
TO:Building ❑ Planning
Public Works Fire Dept. n Police Dept. 101 Parks/Rec
Project:
X6(11 C9 1)1 r„il-7-II 11-‘,1(
Address:
^
J J3' -e-j1' Nilo.
!t- i�1.r,'
l) D--)! t -3
L
LA )
Response
requested by:
Date
transmitted:
Staff
coordinator:.
M +\C1
Date response
received:
REVIEWERS: Please specify how the attached plans conflict with your ADOPTED
development regulations, including citations. Be specific in describing the types of changes you
want made to the plans. When referencing codes, please identify the actual requirement and
plan change needed.
The Planning Division review does not supplant each department's ability to administer its own
regulations and permits. However, project consistency at the Planning review stage is
important to minimize significant later design changes. More than minimal design changes
require further Planning Commission review, even if alteration is required to satisfy a City
requirement. This further review is typically a minimum 60 -day process.
Requirements based on SEPA (e.g., not required by an adopted development regulation)
MUST identify the impact being mitigated, the policy basis for requiring mitigation, and the
method used to calculate the mitigation required. Calculations of project impacts and the
mitigation required (e.g., water capacity, road level of service analyses, or turning analyses)
may be required of the applicant.
COMMENTS
(Attach additional comment sheets and/or support materials as needed.)
SEE ,TrACM,z Coma
117yio
Plan check date:
Comments
Update date:
prepared by:
MEMORANDUM
www.ci.tulcwila.wa.us
Development Guidelines and Design and Construction Standards
TO: PLANNING DEPT. — Brandon Miles, Senior Planner
�i�dYV1
FROM: PUBLIC WORKS DEPT. — David McPherson, Development Engineer
DATE: November 1, 2010
SUBJECT: Sabey Construction Fill
10230 E. Marginal Way South
TL nos. 042304-9015 / 042304-9102 / 032304-9062
SEPA Comments
SEPA — E10-015
The Environmental Checklist should be revised as follows:
A. Background
11. Tax lot nos. 042304-9015 & 042304-9102 within the City of Tukwila are within
the NE 1/4 of Sec. 4, T. 23 N., R. 4 E., W. M.
B. Environmental Elements
5. Animals
c. Yes — This area is part of the Pacific Flyway. A primary corridor for
migratory bird species.
Page 1 of 1
Storm Water Pollution Prevention Plan
For
Sabey Corporation
Northwest Auto Property Stockpile
Prepared For
Sabey Corporation
12201 Tukwila Intl. Blvd., 4th Floor
Seattle, WA 98168
206-281-8700
Owner
Sabey Corporation
12201 Tukwila Intl.
Blvd., 4th Floor
Seattle, WA 98168
U yr d
DEVELOPI EII
Developer
Same
Operator/Contractor
Project Site Location
10230 E. Marginal Way South
Tukwila, WA 98168
Certified Erosion and Sediment Control Lead
Name: Jake Lipp
Phone Number: 425-876-6593
SWPPP Prepared By
David Evans & Associates Inc.
1620 W Marine View Drive
Everett, WA 98201
425-259-4099
Dean Furr, P.E.
SWPPP Preparation Date
September 7, 2010
Approximate Project Construction Dates
Begin Construction - 9/2010 RECEIVED
End Construction - 10/2010
SEP 23 'tuft!
TUKWILA
PUBLIC WORKS
Table of Contents
1.0 Introduction 1
2.0 Site Description 2
2.1 Existing Conditions 2
2.2 Proposed Construction Activities 2
3.0 Construction Stormwater BMPs 4
3.1 The 12 BMP Elements 4
3.1.1 Element #1 — Mark Clearing Limits 4
3.1.2 Element #2 — Establish Construction Access 4
3.1.3 Element #3 — Control Flow Rates 5
3.1.4 Element #4 — Install Sediment Controls 5
3.1.5 Element #5 — Stabilize Soils 6
3.1.6 Element #6 — Protect Slopes 7
3.1.7 Element #7 — Protect Drain Inlets 7
3.1.8 Element #8 — Stabilize Channels and Outlets 8
3.1.9 Element #9 — Control Pollutants 8
3.1.10 Element #10 — Control Dewatering 11
3.1.11 Element #11 — Maintain BMPs 11
3.1.12 Element #12 — Manage the Project 11
4.0 Construction Phasing and BMP Implementation 16
5.0 Pollution Prevention Team 17
5.1 Roles and Responsibilities 17
5.2 Team Members 18
6.0 Site Inspections and Monitoring 19
6.1 Site Inspection 19
6.1.1 Site Inspection Frequency 20
6.1.2 Site Inspection Documentation 20
6.2 Stormwater Quality Monitoring 20
6.2.1 Turbidity Sampling 20
7.0 Reporting and Recordkeeping 22
7.1 Recordkeeping 22
7.1.1 Site Log Book 22
7.1.2 Records Retention 22
7.1.3 Access to Plans and Records 22
7.1.4 Updating the SWPPP 22
7.2 Reporting 23
7.2.1 Discharge Monitoring Reports 23
7.2.2 Notification of Noncompliance 23
7.2.3 Permit Application and Changes 24
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page i
September 7, 2010
Appendix A — Site Plans 25
Appendix B — Construction BMPs 27
Appendix C — Alternative BMPs 28
Appendix D -- General Permit 31
Appendix E — Site Inspection Forms (and Site Log) 32
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page ii
September 7, 2010
1.0 Introduction
This Stormwater Pollution Prevention Plan (SWPPP) has been prepared as part of the stockpile
permit requirements for the City of Tukwila located in Tukwila, Washington. The site entrance
is located at the 10230 E. Marginal Way South, Tukwila, Wa. Construction activities consist of
importing approximately 40,000 cubic yards of soil from the Sound Transit Light Link Rail
project and stockpile it on-site. The stockpile will encompass approximately 5.62 acres. On-site
erosion and sediment management facilities will also be constructed.
The purpose of this SWPPP is to describe the proposed construction activities and all temporary
and permanent erosion and sediment control (TESC) measures, pollution prevention measures,
inspection/monitoring activities, and recordkeeping that will be implemented during the
proposed construction project. The objectives of the SWPPP are to:
1. Implement Best Management Practices (BMPs) to prevent erosion and
sedimentation, and to identify, reduce, eliminate or prevent stormwater
contamination and water pollution from construction activity.
2. Prevent violations of surface water quality, ground water quality, or
sediment management standards.
3. Prevent, during the construction phase, adverse water quality impacts
including impacts on beneficial uses of the receiving water by controlling
peak flow rates and volumes of stormwater runoff at the Permittee's
outfalls and downstream of the outfalls.
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 1
September 7, 2010
2.0 Site Description
The construction site entrance is located on north portion of the site south of South Norfolk
Street. A site vicinity map is provided in Appendix A. The former Northwest Auto property
area is t -shaped, and is approximately 6.81 acres, tax parcels 0423049102, 0423049015 and
0323049062. The site is currently un -developed and is being used as a tractor -trailer storage.
The site consists of one drainage basin, is relatively flat, with the majority of the site having a
slight gradient east. This site has recently been remediated and backfilled with recycled brick
and concrete. The material below the recycled brick and concrete consists of sandy dredge
material. Currently, all surface water infiltrates into the permeable dredge soils.
2.1 Existing Conditions
Presently, the project area is undeveloped and relatively flat sloping eastward. The site consists
of a single drainage basin. Runoff from the north parking lot sheet flows eastward to a storm
drainage swale and enters into a catch basin at the south east corner of this property. Stormwater
is conveyed in a southwest direction to a catch basin located on the south property, parcel
#0423049099 adjacent to proposed site. This catchbasin is located near the south property line
of the site. Storwater from this catch basin is conveyed to the 60 -inch stormwater main that
outfalls into the Duwamish River. Stonnwater runoff from East Marginal Way enters the
enclosed drainage system within the right-of-way and is discharged into the Duwamish River.
Stormwater runoff from the Associated Grocers site adjacent to the east does not enter onto the
project. All onsite stormwater infiltrates into the permeable soil. There is no noticeable ponding
within this area.
The Duwamish River is to the west on the west side of East Marginal Way. It is anticipated that
the river will not be affected by the stockpiling activities.
2.2 Proposed Construction Activities
The proposed construction activities consist of importing approximately 40,000 cubic yards of
soil from the Sound Transit Light Link Rail project and stockpile it on-site. The stockpile will
encompass approximately 5.62 acres. On-site erosion and sediment management facilities will
also be constructed. The stockpile will be stabilized with recycled brick and concrete.
Construction activities will include site preparation, TESC installation, site wide grading while
import is being delivered and final site stabilization. The schedule and phasing of BMPs during
construction is provided in Section 4.0.
Storm water runoff volumes were calculated using WWHM. 3.
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 2
September 7, 2010
The following summarizes details regarding site areas:
• Total site area: 6.81 acres
• Percent impervious area before construction: 5 %
• Percent impervious area after construction: 5 %
• Disturbed area during construction: 6.5 acres
• Disturbed area that is characterized as impervious
(i.e., access roads and stockpile): 0 acres
• 2 -year stormwater runoff peak flow prior to construction
(existing): ALL runoff is infiltrated 0 cfs
• 10 -year stormwater runoff peak flow prior to construction
(existing): ALL runoff is infiltrated 0 cfs
• 2 -year stormwater runoff peak flow during construction: 1.25 cfs
• 10 -year stonnwater runoff peak flow during construction: 1.69 cfs
• 2 -year stormwater runoff peak flow
after construction without flow control: 1.25 cfs
• 10 -year stonnwater runoff peak flow
after construction without flow control: 1.69 cfs
The assumed infiltration rate for the infiltration and sedimentation facility is 8-inches/hour with a
0.75 reduction factor, which reduces the proposed infiltration to 6-inches/hour, for short term
infiltration. Infiltration ponds have been designed to fully infiltrate the 2yr and 10 yr runoff
volume as predicted by WWHM3, the required pond sizes are as follows:
2yr: 5,330 square feet bottom area with 3.5 feet depth IN permeable dredge soil.
l0yr: 7,735 square feet bottom area with 3.5 feet depth IN permeable dredge soil.
Additional infiltration will occur on the undisturbed areas during construction activites. To
protect the infiltration ponds, all sediment laden runoff must enter a pre -settling cell and/or any
of the BMPs proposed in Element #4 before infiltration.
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 3
September 7, 2010
3.0 Construction Stormwater BMPs
3.1 The 12 BMP Elements
3.1.1 Element #1 — Mark Clearing Limits
To protect adjacent properties and to reduce the area of soil exposed to construction, the limits of
construction will be clearly marked before land -disturbing activities begin. Trees that are to be
preserved, as well as all sensitive areas and their buffers, shall be clearly delineated, both in the
field and on the plans. In general, natural vegetation and native topsoil shall be retained in an
undisturbed state to the maximum extent possible. The BMPs relevant to marking the clearing
limits that will be applied for this project include:
High Visibility Plastic or Metal Fence (BMP C103)
Alternative BMP not included in the SWMMWW (2005)
Alternate BMPs for marking clearing limits are included in Appendix C as a quick reference tool
for the onsite inspector in the event the BMP(s) listed above are deemed ineffective or
inappropriate during construction to satisfy the requirements set forth in the General NPDES
Permit (Appendix D). To avoid potential erosion and sediment control issues that may cause a
violation(s) of the NPDES Construction Stormwater permit (as provided in Appendix D), the
Certified Erosion and Sediment Control Lead will promptly initiate the implementation of one or
more of the alternative BMPs listed in Appendix C after the first sign that existing BMPs are
ineffective or failing.
3.1.2 Element in— Establish Construction Access
Construction access or activities occurring on unpaved areas shall be minimized, yet where
necessary, access points shall be stabilized to minimize the tracking of sediment onto public
roads, and wheel washing, street sweeping, and street cleaning shall be employed to prevent
sediment from entering state waters. All wash wastewater shall be controlled on site. The
specific BMPs related to establishing construction access that will be used on this project
include:
Stabilized Construction Entrance (BMP C105)
Wheel Wash (BMP C106) if necessary
Construction Road/Parking Area Stabilization (BMP C107)
Alternative BMP not included in the SWMMWW (2005)
Alternate construction access BMPs are included in Appendix C as a quick reference tool for the
onsite inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate
during construction to satisfy the requirements set forth in the General NPDES Permit (Appendix.
D). To avoid potential erosion and sediment control issues that may cause a violation(s) of the
NPDES Construction Stormwater permit (as provided in Appendix D), the Certified Erosion and
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 4
September 7, 2010
Sediment Control Lead will promptly initiate the implementation of one or more of the
alternative BMPs listed in Appendix C after the first sign that existing BMPs are ineffective or
fai ling.
3.1.3 Element #3 — Control Flow Rates
In order to protect the properties and waterways downstream of the project site, stormwater
discharges from the site will be controlled. The specific BMPs for flow control that shall be used
on this project include:
Sediment Trap (BMP C240): See required design size in Section 2.2
Silt Fence (BMP C233)
Alternative BMP not included in the SWMMWW (2005)
Alternate flow control BMPs are included in Appendix C as a quick reference tool for the onsite
inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate during
construction to satisfy the requirements set forth in the General NPDES Permit (Appendix D).
To avoid potential erosion and sediment control issues that may cause a violation(s) of the
NPDES Construction Stormwater permit (as provided in Appendix D), the Certified Erosion and
Sediment Control Lead will promptly initiate the implementation of one or more of the
alternative BMPs listed in Appendix C after the first sign that existing BMPs are ineffective or
failing.
The project site is located west of the Cascade Mountain Crest. As such, the project must
comply with Minimum Requirement 7 (Ecology 2005).
In general, discharge rates of stormwater from the site will be controlled where increases in
impervious area or soil compaction during construction could lead to downstream erosion, or
where necessary to meet local agency stormwater discharge requirements (e.g. discharge to
combined sewer systems).
3.1.4 Element #4 — Install Sediment Controls
All stormwater runoff from disturbed areas shall pass through an appropriate sediment removal
BMP before leaving the construction site or prior to being discharged to an infiltration facility.
The specific BMPs to be used for controlling sediment on this project include:
Storm Drain Inlet Protection (BMP C 220)
Silt Fence (BMP C233)
Straw Wattles (BMP C235)
Sediment Trap (BMP C240)
Materials on Hand (BMP C150)
Presettling Pond
Alternative BMP not included in the SWMMWW (2005)
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 5
September 7, 2010
Alternate sediment control BMPs are included in Appendix C as a quick reference tool for the
onsite inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate
during construction to satisfy the requirements set forth in the General NPDES Permit (Appendix
D). To avoid potential erosion and sediment control issues that may cause a violation(s) of the
NPDES Construction Stormwater permit (as provided in Appendix D), the Certified Erosion and
Sediment Control Lead will promptly initiate the implementation of one or more of the
alternative BMPs listed in Appendix C after the first sign that existing BMPs are ineffective or
failing.
In addition, sediment will be removed from paved areas in and adjacent to construction work
areas manually or using mechanical sweepers, as needed, to minimize tracking of sediments on
vehicle tires away from the site and to minimize washoff of sediments from adjacent streets in
runoff.
Whenever possible, sediment laden water shall be discharged into onsite, relatively level,
vegetated areas (BMP C240 paragraph 5, page 4-102).
In some cases, sediment discharge in concentrated runoff can be controlled using permanent
stormwater BMPs (e.g., infiltration swales, ponds, trenches). Sediment loads can limit the
effectiveness of some permanent stoimwater BMPs, such as those used for infiltration or
biofiltration; however, those BMPs designed to remove solids by settling (wet ponds or detention
ponds) can be used during the construction phase. When permanent stormwater BMPs will be
used to control sediment discharge during construction, the structure will be protected from
excessive sedimentation with adequate erosion and sediment control BMPs. Any accumulated
sediment shall be removed after construction is complete and the permanent stormwater BMP
will be restabilized with vegetation per applicable design requirements once the remainder of the
site has been stabilized.
3.1.5 Element #5 — Stabilize Soils
Exposed and unworked soils shall be stabilized with the application of effective BMPs to prevent
erosion throughout the life of the project. The specific BMPs for soil stabilization that shall be
used on this project include:
Temporary and Permanent Seeding (BMP C120): if applicable
Mulching (BMP C121)
Plastic Covering (BMP C 123)
Dust Control (BMP C140)
Materials on Hand (BMP C150)
Early application of recycled brick and concrete over finished stockpile areas
Alternative BMP not included in the SWMMWW (2005)
Alternate soil stabilization BMPs are included in Appendix C as a quick reference tool for the
onsite inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate
during construction to satisfy the requirements set forth in the General NPDES Permit (Appendix
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 6
September 7, 2010
D). To avoid potential erosion and sediment control issues that may cause a violation(s) of the
NPDES Construction Stonnwater permit (as provided in Appendix D), the Certified Erosion and
Sediment Control Lead will promptly initiate the implementation of one or more of the
alternative BMPs listed in Appendix C after the first sign that existing BMPs are ineffective or
failing.
The project site is located west of the Cascade Mountain Crest. As such, no soils shall remain
exposed and unworked for more than 7 days during the dry season (May 1 to September 30) and
2 days during the wet season (October 1 to April 30). Regardless of the time of year, all soils
shall be stabilized at the end of the shift before a holiday or weekend if needed based on weather
forecasts.
In general, cut and fill slopes will be stabilized as soon as possible and soil stockpiles will be
temporarily covered with plastic sheeting. All stockpiled soils shall be stabilized from erosion, •
protected with sediment trapping measures, and where possible, be located away from storm
drain inlets, waterways, and drainage channels.
3.1.6 Element #6 — Protect Slopes
All cut and fill slopes will be designed, constructed, and protected in a manner than minimizes
erosion. The following specific BMPs will be used to protect slopes for this project:
Temporary and Permanent Seeding (BMP C120)
Interceptor Dike and Swale (BMP C200)
Check Dams (BMP C207)
Materials on Hand (BMP C150)
Alternative BMP not included in the SWMMWW (2005)
Alternate slope protection BMPs are included in Appendix C as a quick reference tool for the
onsite inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate
during construction to satisfy the requirements set forth in the General NPDES Permit (Appendix
D). To avoid potential erosion and sediment control issues that may cause a violation(s) of the
NPDES Construction Stonnwater permit (as provided in Appendix D), the Certified Erosion and
Sediment Control Lead will promptly initiate the implementation of one or more of the
alternative BMPs listed in Appendix C after the first sign that existing BMPs are ineffective or
fai ling.
3.1.7 Element #7 — Protect Drain Inlets
All storm drain inlets and culverts existing or made operable during construction shall be
protected to prevent unfiltered or untreated water from entering the drainage conveyance system.
However, the first priority is to keep all access roads clean of sediment and keep street wash
water separate from entering storm drains until treatment can be provided. Storm Drain Inlet
Protection (BMP C220) will be implemented for all drainage inlets and culverts that could
Storrn Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 7
September 7, 2010
potentially be impacted by sediment -laden runoff on and near the project site. The following
inlet protection measures will be applied on this project:
Stone Drain Inlet Protection (BMP C 220)
Alternative BMP not included in the SWMMWW (2005)
If the BMP options listed above are deemed ineffective or inappropriate during construction to
satisfy the requirements set forth in the General NPDES Permit (Appendix D), or if no BMPs are
listed above but deemed necessary during construction, the Certified Erosion and Sediment
Control Lead shall implement one or more of the alternative BMP inlet protection options listed
in Appendix C.
3.1.8 Element #8 — Stabilize Channels and Outlets
Where site runoff is to be conveyed in channels, or discharged to a stream or some other natural
drainage point, efforts will be taken to prevent downstream erosion. The specific BMPs for
channel and outlet stabilization that shall be used on this project include:
Check Dams (BMPC207)
Outlet Protection (BMP C209)
Materials on Hand (BMP C150)
Alternative BMP not included in the SWMMWW (2005)
Alternate channel and outlet stabilization BMPs are included in Appendix C as a quick reference
tool for the onsite inspector in the event the BMP(s) listed above are deemed ineffective or
inappropriate during construction to satisfy the requirements set forth in the General NPDES
Permit (Appendix D). To avoid potential erosion and sediment control issues that may cause a
violation(s) of the NPDES Construction Stonnwater permit (as provided in Appendix D), the
Certified Erosion and Sediment Control Lead will promptly initiate the implementation of one or
more of the alternative BMPs listed in Appendix C after the first sign that existing BMPs are
ineffective or failing.
3.1.9 Element #9 — Control Pollutants
All pollutants, including waste materials and demolition debris, that occur onsite shall be
handled and disposed of in a manner that does not cause contamination of stormwater. Good
housekeeping and preventative measures will be taken to ensure that the site will be kept clean,
well organized, and free of debris. If required, BMPs to be implemented to control specific
sources of pollutants are discussed below.
Vehicles, construction equipment, and/or petroleum product storage/dispensing:
• All vehicles, equipment, and petroleum product storage/dispensing areas will
be inspected regularly to detect any leaks or spills, and to identify
maintenance needs to prevent leaks or spills.
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 8
September 7, 2010
• On-site fueling tanks and petroleum product storage containers shall include
secondary containment.
• Spill prevention measures, such as drip pans, will be used when conducting
maintenance and repair of vehicles or equipment.
• In order to perform emergency repairs on site, temporary plastic will be
placed beneath and, if raining, over the vehicle.
• Contaminated surfaces shall be cleaned immediately following any discharge
or spill incident.
Chemical storage:
■ Any chemicals stored in the construction areas will conform to the appropriate
source control BMPs listed in Volume IV of the Ecology stormwater manual.
In Western WA, all chemicals shall have cover, containment, and protection
provided on site, per BMP C153 for Material Delivery, Storage and
Containment in SWMMWW 2005
• Application of agricultural chemicals, including fertilizers and pesticides,
shall be conducted in a manner and at application rates that will not result in
loss of chemical to stormwater runoff. Manufacturers' recommendations for
application procedures and rates shall be followed.
Excavation and tunneling spoils dewatering waste:
• Dewatering BMPs and BMPs specific to the excavation and tunneling
(including handling of contaminated soils) are discussed under Element 10.
Demolition:
• Dust released from demolished sidewalks, buildings, or structures will be
controlled using Dust Control measures (BMP C140).
• Storm drain inlets vulnerable to stormwater discharge carrying dust, soil, or
debris will be protected using Storm Drain Inlet Protection (BMP C220 as
described above for Element 7).
■ Process water and slurry resulting from sawcutting and surfacing operations
will be prevented from entering the waters of the State by implementing
Sawcutting and Surfacing Pollution Prevention measures (BMP C152).
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 9
September 7, 2010
Concrete and grout:
• Process water and slurry resulting from concrete work will be prevented from
entering the waters of the State by implementing Concrete Handling measures
(BMP C151).
Sanitary wastewater:
• Portable sanitation facilities will be firmly secured, regularly maintained, and
emptied when necessary.
• Wheel wash or tire bath wastewater shall be discharged to a separate on-site
treatment system or to the sanitary sewer as part of Wheel Wash
implementation (BMP C106).
Solid Waste:
Other:
■ Solid waste will be stored in secure, clearly marked containers.
• Other BMPs will be administered as necessary to address any additional
pollutant sources on site.
As per the Federal regulations of the CIean Water Act (CWA) and according to Final Rule 40
CFR Part 112, as stated in the National Register, a Spill Prevention, Control, and
Countermeasure (SPCC) Plan is required for construction activities. A SPCC Plan will be
prepared by the contractor to address an approach to prevent, respond to, and report spills or
releases to the environment that could result from construction activities. This Plan must:
■ Be well thought out in accordance with good engineering;
• Achieve three objectives - prevent spills, contain a spill that occurs, and clean
up the spill;
• Identify the name, location, owner, and type of facility;
• Include the date of initial operation and oil spill history;
• Name the designated person responsible;
• Show evidence of approval and certification by the person in authority; and
• Contain a facility analysis.
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 10
September 7, 2010
3.1.10 Element #10 — Control Dewatering
No dewatering is anticipated as part of this construction project. Contractor will develop
dewatering plan if necessary given site specific construction needs.
Alternate dewatering control BMPs are included in Appendix C as a quick reference tool for the
onsite inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate
during construction to satisfy the requirements set forth in the General NPDES Permit (Appendix
D). To avoid potential erosion and sediment control issues that may cause a violation(s) of the
NPDES Construction Stormwater permit (as provided in Appendix D), the Certified Erosion and
Sediment Control Lead will promptly initiate the implementation of one or more of the
alternative BMPs listed in Appendix C after the first sign that existing BMPs are ineffective or
fai ling.
3.1.11 Element #11 — Maintain BMPs
All temporary and permanent erosion and sediment control BMPs shall be maintained and
repaired as needed to assure continued performance of their intended function. Maintenance and
repair shall be conducted in accordance with each particular BMP's specifications. Visual
monitoring of the BMPs will be conducted at least once every calendar week and within 24 hours
of any rainfall event that causes a discharge from the site. If the site becomes inactive, and is
temporarily stabilized, the inspection frequency will be reduced to once every month.
All temporary erosion and sediment control BMPs shall be removed within 30 days after the
final site stabilization is achieved or after the temporary BMPs are no longer needed. Trapped
sediment shall be removed or stabilized on site. Disturbed soil resulting from removal of BMPs
or vegetation shall be permanently stabilized.
3.1.12 Element #12 — Manage the Project
Erosion and sediment control BMPs for this project have been designed based on the following
principles:
• Design the project to fit the existing topography, soils, and drainage patterns.
• Emphasize erosion control rather than sediment control.
• Minimize the extent and duration of the area exposed.
• Keep runoff velocities low.
• Retain sediment on site.
• Thoroughly monitor site and maintain all ESC measures.
• Schedule major earthwork during the dry season.
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 11
September 7, 2010
In addition, project management will incorporate the key components listed below:
As this project site is located west of the Cascade Mountain Crest, the project will be managed
according to the following key project components:
Phasing of Construction
• The construction project is being phased to the extent practicable in order to
prevent soil erosion, and, to the maximum extent possible, the transport of
sediment from the site during construction.
• If applicable, revegetation of exposed areas and maintenance of that
vegetation can be an integral part of the clearing activities during each phase
of construction, per the Scheduling BMP (C 162)
Seasonal Work Limitations
• From October 1 through April 30, clearing, grading, and other soil disturbing
activities shall only be permitted if shown to the satisfaction of the local
permitting authority that silt -laden runoff will be prevented from leaving the
site through a combination of the following:
Cl Site conditions including existing vegetative coverage, slope, soil
type, and proximity to receiving waters; and
C) Limitations on activities and the extent of disturbed areas; and
❑ Proposed erosion and sediment control measures.
• Based on the information provided and/or local weather conditions, the local
permitting authority may expand or restrict the seasonal limitation on site
disturbance.
• The following activities are exempt from the seasonal clearing and grading
limitations:
O Routine maintenance and necessary repair of erosion and sediment
control BMPs;
• Routine maintenance of public facilities or existing utility structures
that do not expose the soil or result in the removal of the vegetative
cover to soil; and
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 12
September 7, 2010
Li Activities where there is 100 percent infiltration of surface water
runoff within the site in approved and installed erosion and sediment
control facilities.
Coordination with Utilities and Other Jurisdictions
• Care has been taken to coordinate with utilities, other construction projects,
and the local jurisdiction in preparing this SWPPP and scheduling the
construction work.
• As a precautionary measure in the event that the infiltration gallery has
insufficient capacity. an agreement with the local sanitary sewer district
should be made to temporarily allow sediment laden storniwater to be
discharged directly into the sanitary sewer.
Inspection and Monitoring
• All BMPs shall be inspected, maintained, and repaired as needed to assure
continued performance of their intended function. Site inspections shall be
conducted by a person who is knowledgeable in the principles and practices of
erosion and sediment control. This person has the necessary skills to:
L7 Assess the site conditions and construction activities that could
impact the quality of stormwater, and
(� Assess the effectiveness of erosion and sediment control measures
used to control the quality of stormwater discharges.
• A Certified Erosion and Sediment Control Lead shall be on-site or on-call at
all times.
• Whenever inspection and/or monitoring reveals that the BMPs identified in
this SWPPP are inadequate, due to the actual discharge of or potential to
discharge a significant amount of any pollutant, appropriate BMPs or design
changes shall be implemented as soon as possible.
Maintaining an Updated Construction SWPPP
• This SWPPP shall be retained on-site or within reasonable access to the site.
• The SWPPP shall be modified whenever there is a change in the design,
construction, operation, or maintenance at the construction site that has, or
could have, a significant effect on the discharge of pollutants to waters of the
state.
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 13
September 7, 2010
• The SWPPP shall be modified if, during inspections or investigations
conducted by the owner/operator, or the applicable local or state regulatory
authority, it is determined that the SWPPP is ineffective in eliminating or
significantly minimizing pollutants in stonnwater discharges from the site.
The SWPPP shall be modified as necessary to include additional or modified
BMPs designed to correct problems identified. Revisions to the SWPPP shall
be completed within seven (7) days following the inspection.
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 14
September 7, 2010
3.2 Site Specific BMPs
Site specific BMPs are shown on the TESC Plan Sheets and Details in Appendix A.
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 15
September 7, 2010
4.0 Construction Phasing and BMP Implementation
The BMP implementation schedule will be driven by the construction schedule. The following
provides a sequential list of the proposed construction schedule milestones and the corresponding
BMP implementation schedule. The list contains key milestones such as wet season
construction.
The BMP implementation schedule listed below is keyed to proposed phases of the construction
project, and reflects differences in BMP installations and inspections that relate to wet season
construction. The project site is located west of the Cascade Mountain Crest. As such, the dry
season is considered to be from May 1 to September 30 and the wet season is considered to be
from October 1 to April 30.
(If a detailed project schedule is available insert here.)
1. Estimate of Stockpile start date:
2. Estimate of Stockpile finish date:
3. Mobilize equipment on site:
4. Mobilize and store all ESC and soil stabilization products
(store materials on hand BMP C150):
5. Install ESC measures:
6. Install stabilized construction entrance:
Begin stockpiling recycled brick and concrete:
8. Site inspections weekly:
9. Begin implementing soil stabilization and sediment
control BMPs throughout the site in preparation for wet
season:
10. Wet Season starts:
11. Site inspections and monitoring conducted weekly and
for applicable rain events as detailed in Section 6 of this
S W PPP:
12. Implement Element #12 BMPs and manage site to
minimize soil disturbance during the wet season
13. Dry Season starts:
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
10/01/2010
10 /01 /2010
10/01 /2010
05/01 /2010
Page 16
September 7, 2010
5.0 Pollution Prevention Team
5.1 Roles and Responsibilities
The pollution prevention team consists of personnel responsible for implementation of the
SWPPP, including the following:
• Certified Erosion and Sediment Control Lead (CESCL) — primary contractor
contact, responsible for site inspections (BMPs, visual monitoring, sampling,
etc.); to be called upon in case of failure of any ESC measures.
• Resident Engineer — For projects with engineered structures only (sediment
ponds/traps, sand filters, etc.): site representative for the owner that is the
project's supervising engineer responsible for inspections and issuing
instructions and drawings to the contractor's site supervisor or representative
• Emergency Ecology Contact — individual to be contacted at Ecology in case of
emergency.
• Emergency Owner Contact — individual that is the site owner or representative
of the site owner to be contacted in the case of an emergency.
• Non -Emergency Ecology Contact — individual that is the site owner or
representative of the site owner than can be contacted if required.
• Monitoring Personnel — personnel responsible for conducting water quality
monitoring; for most sites this person is also the Certified Erosion and
Sediment Control Lead.
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 17
September 7, 2010
5.2 Team Members
Names and contact information for those identified as members of the pollution prevention team
are provided in the following table.
Title
Name(s)
Phone Number
Certified Erosion and Sediment Control Lead
(CESCL)
Jake Lipp
425-876-6593
Resident Engineer
Jack Molver
425-259-4099
Emergency Ecology Contact
425-649-7000
Emergency Owner Contact
Anthony Vincent
206-255-1180
Non -Emergency Ecology Contact
425-649-7000
Monitoring Personnel
Anthony Vincent
206-255-1180
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 18
September 7, 2010
6.0 Site Inspections and Monitoring
Monitoring includes visual inspection, monitoring for water quality parameters of
concern, and documentation of the inspection and monitoring findings in a site log book.
A site log book will be maintained for all on-site construction activities and will include:
• A record of the implementation of the SWPPP and other permit
requirements;
■ Site inspections; and,
■ Stonnwater quality monitoring.
For convenience, the inspection form and water quality monitoring forms included in this
SWPPP include the required information for the site log book. This SWPPP may
function as the site log book if desired, or the forms may be separated and included in a
separate site log book. However, if separated, the site log book but must be maintained
on-site or within reasonable access to the site and be made available upon request to
Ecology or the local jurisdiction.
6.1 Site Inspection
All BMPs will be inspected, maintained, and repaired as needed to assure continued
performance of their intended function. Site inspections will be conducted by a person
who is knowledgeable in the principles and practices of erosion and sediment control.
The onsite inspector will have the skills to assess the potential for water quality impacts
as a result of the type of construction activities occurring on site, and the knowledge of
the appropriate and effective ESC measures needed to control the quality of stormwater
discharges.
All BMPs will be inspected, maintained, and repaired as needed to assure continued
performance of their intended function. The inspector will be a Certified Erosion and
Sediment Control Lead (CESCL) per BMP C160. The name and contact information for
the CESCL is provided in Section 5 of this SWPPP.
Site inspection will occur in all areas disturbed by construction activities and at all
stonnwater discharge points. Stormwater will be examined for the presence of suspended
sediment, turbidity, discoloration, and oily sheen. The site inspector will evaluate and
document the effectiveness of the installed BMPs and determine if it is necessary to
repair or replace any of the BMPs to improve the quality of stormwater discharges. All.
maintenance and repairs will be documented in the site log book or forms provided in this
document. All new BMPs or design changes will be documented in the SWPPP as soon
as possible.
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 19
September 7, 2010
6.1.1 Site Inspection Frequency
Site inspections will be conducted at least once a week and within 24 hours following any
rainfall event which causes a discharge of stoimwater from the site. For sites with
temporary stabilization measures, the site inspection frequency can be reduced to once
every month.
6.1.2 Site Inspection Documentation
The site inspector will record each site inspection using the site log inspection forms
provided in Appendix E. The site inspection log forms may be separated from this
SWPPP document, but will be maintained on-site or within reasonable access to the site
and be made available upon request to Ecology or the local jurisdiction.
6.2 Stormwater Quality Monitoring
The construction site is greater than one acre in size, and does not discharge to an
impaired water body, and is therefore subject to the general water quality monitoring
requirements set forth in the 2005 Construction Stomiwater General Permit (Appendix
D).
6.2.1 Turbidity Sampling
Monitoring requirements for the proposed project will include either turbidity or water
transparency sampling to monitor site discharges for water quality compliance with the
2005 Construction Stonnwater General Permit (Appendix D). Sampling will be
conducted at all discharge points at least once per calendar week.
Turbidity or transparency monitoring will follow the analytical methodologies described
in Section S4 of the 2005 Construction Stormwater General Permit (Appendix D). The
key benchmark values that require action are 25 NTU for turbidity (equivalent to 32 cm
transparency) and 250 NTU for turbidity (equivalent to 6 cm transparency). If the 25
NTU benchmark for turbidity (equivalent to 32 cm transparency) is exceeded, the
following steps will be conducted:
1. Ensure all BMPs specified in this SWPPP are installed and
functioning as intended.
2. Assess whether additional BMPs should be implemented, and
document revisions to the SWPPP as necessary.
3. Sample discharge location daily until the analysis results are less
than 25 NTU (turbidity) or greater than 32 cm (transparency).
If the turbidity is greater than 25 NTU (or transparency is less than 32 cm) but less than
250 NTU (transparency greater than 6 em) for more than 3 days, additional treatment
BMPs will be implemented within 24 hours of the third consecutive sample that exceeded
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 20
September 7, 2010
the benchmark value. Additional treatment BMPs to be considered will include, but are
not limited to, off-site treatment, infiltration, filtration and chemical treatment.
If the 250 NTU benchmark for turbidity (or less than 6 cm transparency) is exceeded at
any time, the following steps will be conducted:
1. Notify Ecology by phone within 24 hours of analysis (see Section
5.0 of this SWPPP for contact information).
2. Continue daily sampling until the turbidity is less than 25 NTU (or
transparency is greater than 32 cm).
3. Initiate additional treatment BMPs such as off-site treatment,
infiltration, filtration and chemical treatment within 24 hours of the
first 250 NTU exceedance.
4. Implenment additional treatment BMPs as soon as possible, but
within 7 days of the first 250 NTU exceedance.
5. Describe inspection results and remedial actions taken in the site
log book and in monthly discharge monitoring reports as described
in Section 7.0 of this SWPPP.
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 21
September 7, 2010
7.0 Reporting and Recordkeeping
7.1 Recordkeeping
7.1.1 Site Log Book
A site log book will be maintained for all on-site construction activities and will include:
• A record of the implementation of the SWPPP and other pennit
requirements;
■ Site inspections; and,
■ Stonnwater quality monitoring.
For convenience, the inspection form and water quality monitoring forms included in this
SWPPP include the required information for the site log book. A separate site log book
is not required and this document may also serve as a log book. However, if extensive
monitoring is anticipated a separate log book may be useful.
7.1.2 Records Retention
Records of all monitoring information (site log book, inspection reports/checklists, etc.),
this Stormwater Pollution Prevention Plan, and any other documentation of compliance
with permit requirements will be retained during the life of the construction project and
for a minimum of three years following the termination of permit coverage in accordance
with permit condition S5.C.
7.1.3 Access to Plans and Records
The SWPPP, General Permit, Notice of Authorization letter, and Site Log Book will be
retained on site or within reasonable access to the site and will be made immediately
available upon request to Ecology or the local jurisdiction. A copy of this SWPPP will
be provided to Ecology within 14 days of receipt of a written request for the SWPPP
from Ecology. Any other information requested by Ecology will be submitted within a
reasonable time. A copy of the SWPPP or access to the SWPPP will be provided to the
public when requested in writing in accordance with permit condition S5.G.
7.1.4 Updating the SWPPP
In accordance with Conditions S3, S4.B, and S9.B.3 of the General Permit, this SWPPP
will be modified if the SWPPP is ineffective in eliminating or significantly minimizing
pollutants in stormwater discharges from the site or there has been a change in design,
construction, operation, or maintenance at the site that has a significant effect on the
discharge, or potential for discharge, of pollutants to the waters of the State. The SWPPP
will be modified within seven days of determination based on inspection(s) that
Storm Water Pollution Prevention Plan Page 22
Sabey Corporation, Northwest Auto Stockpile September 7, 2010
additional or modified BMPs are necessary to correct problems identified, and an updated
timeline for BMP implementation will be prepared.
7.2 Reporting
7.2.1 Discharge Monitoring Reports
Discharge Monitoring Report (DMR) forms will not be submitted to Ecology because
water quality sampling is not being conducted at the site.
Water quality sampling results will be submitted to Ecology monthly on Discharge
Monitoring Report (DMR) forms in accordance with permit condition S5.B. If there was
no discharge during a given monitoring period, the form will be submitted with the words
"no discharge" entered in place of the monitoring results. If a benchmark was exceeded,
a brief summary of inspection results and remedial actions taken will be included. If
sampling could not be performed during a monitoring period, a DMR will be submitted
with an explanation of why sampling could not be performed.
7.2.2 Notification of Noncompliance
If any of the terms and conditions of the permit are not met, and it causes a threat to
human health or the environment, the following steps will be taken in accordance with
permit section S5.F:
1. Ecology will be immediately notified of the failure to comply.
2. Immediate action will be taken to.control the noncompliance issue
and to correct the problem. If applicable, sampling and analysis of
any noncompliance will be repeated immediately and the results
submitted to Ecology within five (5) days of becoming aware of
the violation.
3. A detailed written report describing the noncompliance will be
submitted to Ecology within five (5) days, unless requested earlier
by Ecology.
Any time turbidity sampling indicates turbidity is 250 nephelometric turbidity units
(NTU) or greater or water transparency is 6 centimeters or less, the Ecology regional
office will be notified by phone within 24 hours of analysis as required by permit
condition S5.A (see Section 5.0 of this SWPPP for contact information).
In accordance with permit condition S4.F.6.b, the Ecology regional office will be notified
if chemical treatment other than CO2 sparging is planned for adjustment of high pH water
(see Section 5.0 of this SWPPP for contact information).
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 23
September 7, 2010
7.2.3 Permit Application and Changes
In accordance with permit condition S2.A, a complete application form will be submitted
to Ecology and the appropriate local jurisdiction (if applicable) to be covered by the
General Permit.
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 24
September 7, 2010
Appendix A — Site Plans
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 25
September 7, 2010
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Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest. Auto Stockpile
Page 26
September 7, 2010
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Appendix B — Construction BMPs
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 27
September 7, 2010
BMP C103: High Visibility Plastic or Metal Fence
Purpose Fencing is intended to: (1) restrict clearing to approved limits; (2) prevent
disturbance of sensitive areas, their buffers, and other areas required to be
left undisturbed; (3) limit construction traffic to designated construction
entrances or roads; and, (4) protect areas where marking with survey tape
may not provide adequate protection.
Conditions of Use To establish clearing limits, plastic or metal fence may be used:
• At the boundary of sensitive areas, their buffers, and other areas
required to be left uncleared.
• As necessary to control vehicle access to and on the site.
Design and • High visibility plastic fence shall be composed of a high-density
Installation polyethylene material and shall be at least four feet in height. Posts
Specifications for the fencing shall be steel or wood and placed every 6 feet on
center (maximum) or as needed to ensure rigidity. The fencing shall
be fastened to the post every six inches with a polyethylene tie. On
long continuous lengths of fencing, a tension wire or rope shall be
used as a top stringer to prevent sagging between posts. The fence
color shall be high visibility orange. The fence tensile strength shall
be 360 lbs./ft. using the ASTM D4595 testing method.
• Metal fences shall be designed and installed according to the
manufacturer's specifications.
• Metal fences shall be at least 3 feet high and must be highly visible.
• Fences shall not be wired or stapled to trees.
Maintenance • If the fence has been damaged or visibility reduced, it shall be
Standards repaired or replaced immediately and visibility restored.
4-6 Volume 11- Construction Stormwater Pollution Prevention February 2005
BMP C105: Stabilized Construction Entrance
Purpose Construction entrances are stabilized to reduce the amount of sediment
transported onto paved roads by vehicles or equipment by constructing a
stabilized pad of quarry spalls at entrances to construction sites.
Conditions of Use Construction entrances shall be stabilized wherever traffic will be leaving
a construction site and traveling on paved roads or other paved areas
within 1,000 feet of the site.
On large commercial, highway, and road projects, the designer should
include enough extra materials in the contract to allow for additional
stabilized entrances not shown in the initial Construction SWPPP. It is
difficult to determine exactly where access to these projects will take
place; additional materials will enable the contractor to install them where
needed.
Design and • See Figure 4.2 for details. Note:. the 100' minimum length of the
Installation entrance shall be reduced to the maximum practicable size when the
Specifications size or configuration of the site does not allow the full length (100').
• A separation geotextile shall be placed under the spalls to prevent
fine sediment from pumping up into the rock pad. The geotextile
shall meet the following standards:
Grab Tensile Strength (ASTM D4751)
200 psi min.
Grab Tensile Elongation (ASTM D4632)
30% max.
Mullen Burst Strength (ASTM D3786 -80a)
400 psi min.
AOS (ASTM D4751)
20-45 (U.S. standard sieve size)
• Consider early installation of the first lift of asphalt in areas that will
paved; this can be used as a stabilized entrance. Also consider the
installation of excess concrete as a stabilized entrance. During large
concrete pours, excess concrete is often available for this purpose.
• Hog fuel (wood -based mulch) may be substituted for or combined with
quarry spalls in areas that will not be used for permanent roads. Hog
fuel is generally less effective at stabilizing construction entrances and
should be used only at sites where the amount of traffic is very limited.
Hog fuel is not recommended for entrance stabilization in urban areas.
The effectiveness of hog fuel is highly variable and it generally
requires more maintenance than quarry spalls. The inspector may at
any time require the use of quarry spalls if the hog fuel is not
preventing sediment from being tracked onto pavement or if the hog
fuel is being carried onto pavement. I -log fuel is prohibited in
permanent roadbeds because organics in the subgrade soils cause
degradation of the subgrade support over time.
• Fencing (see BMPs C103 and C104) shall be installed as necessary to
restrict traffic to the construction entrance.
4-8 Volume 11— Construction Stormwater Pollution Prevention February 2005
• Whenever possible, the entrance shall be constructed on a firm,
compacted subgrade. This can substantially increase the effectiveness
of the pad and reduce the need for maintenance.
Maintenance • Quarry spalls (or hog fuel) shall be added if the pad is no longer in
Standards accordance with the specifications.
• If the entrance is not preventing sediment from being tracked onto
pavement, then alternative measures to keep the streets free of
sediment shall be used. This may include street sweeping, an increase
in the dimensions of the entrance, or the installation of a wheel wash.
• Any sediment that is tracked onto pavement shall be removed by
shoveling or street sweeping. The sediment collected by sweeping
shall be removed or stabilized on site. The pavement shall not be
cleaned by washing down the street, except when sweeping is
ineffective and there is a threat to public safety. If it is necessary to
wash the streets, the construction of a small sump shall be considered.
The sediment would then be washed into the sump where it can be
controlled.
• Any quarry spalls that are loosened from the pad, which end up on the
roadway shall be removed immediately.
• If vehicles are entering or exiting the site at points other than the
construction entrance(s), fencing (see BMPs C103 and C104) shall be
installed to control traffic.
• Upon project completion and site stabilization, all construction
accesses intended as permanent access for maintenance shall be
permanently stabilized.
Orive vay shall moot the
rc; u;,iasents of the
permitting agency
I; Is recommended Inaf
tho palmetto bo
crowned sO that rueofl
drags oft the pad
g,.
0
hlstatt dnveway culvert
it there is a roadside
Bach oresont
query spalls
Goole>tile
17 Alin. thickness
Provide lull vnulh of
mgicas,egiess Aron
Figure 4.2 — Stabilized Construction Entrance
February 2005 Volume 11— Construction Stormwater Pollution Prevention
4-9
BMP C106: Wheel Wash
Purpose
Conditions of Use
Wheel washes reduce the amount of sediment transported onto paved
roads by motor vehicles.
When a stabilized construction entrance (see BMP C105) is not preventing
sediment from being tracked onto pavement.
• Wheel washing is generally an effective BMP when installed with
careful attention to topography. For example, a wheel wash can be
detrimental if installed at the top of a slope abutting a right-of-way
where the water from the dripping truck can run unimpeded into the
street.
• Pressure washing combined with an adequately sized and surfaced pad
with direct drainage to a large 10 -foot x 10 -foot sump can be very
effective.
Design and Suggested details are shown in Figure 4.3. The Local Permitting
Installation Authority may allow other designs. A minimum of 6 inches of asphalt
Specifications treated base (ATB) over crushed base material or 8 inches over a good
subgrade is recommended to pave the wheel wash.
Use a low clearance truck to test the wheel wash before paving. Either a
belly dump or lowboy will work well to test clearance.
Keep the water level from 12 to 14 inches deep to avoid damage to truck
hubs and filling the truck tongues with water.
Midpoint spray nozzles are only needed in extremely muddy conditions.
Wheel wash systems should be designed with a small grade change, 6 to
12 inches for a 10 -foot -wide pond, to allow sediment to flow to the low
side of pond to help prevent re -suspension of sediment. A drainpipe with
a 2- to 3 -foot riser should be installed on the low side of the pond to allow
for easy cleaning and refilling. Polymers may be used to promote
coagulation and flocculation in a closed-loop system. Polyacrylamide
(PAM) added to the wheel wash water at a rate of 0.25 - 0.5 pounds per
1,000 gallons of water increases effectiveness and reduces cleanup time.
If PAM is already being used for dust or erosion control and is being
applied by a water truck, the same truck can be used to change the wash
water.
Maintenance
Standards
The wheel wash should start out the day with fresh water.
The wash water should be changed a minimum of once per day. On
large earthwork jobs where more than 10-20 trucks per hour are
expected, the wash water will need to be changed more often.
Wheel wash or tire bath wastewater shall be discharged to a separate on-
site treatment system, such as closed-loop recirculation or land
application, or to the sanitary sewer with proper local sewer district
approval.
4-10 Volume 11— Construction Stormwater Pollution Prevention February 2005
2" Schedule 40
1 '/2' schedule 40 for sprayers
r
lope
Wheel Wash Pian
20' 15
tj
Elevation View
8
. Water level
50'
Section A -A
N.T.S.
Figure 4.3 Wheel Wash
Notes:
1. Asphalt construction entrance 6 in. asphalt treated base (ATB).
2. 3 -inch trash pump with floats on the suction hose.
3. Midpoint spray nozzles, if needed.
4. 6 -inch sewer pipe with butterfly valves. Bottom one is a drain. Locate top pipe's invert 1 foot
above bottom of wheel wash.
5. 8 foot x 8 foot sump with 5 feet of catch. Build so can be cleaned with trackhoe.
6. Asphalt curb on the low road side to direct water back to pond.
7. 6 -inch sleeve under road.
8. Ball valves.
9. 15 foot. ATB apron to protect ground from splashing water.
February 2005
Volume 11— Construction Stormwater Pollution Prevention 4-11
lI
/
2%
5:1
5:1
I
1
I
I 2%
Slope
Slope
Slope
Slope
11
1'l <
II
lope
Wheel Wash Pian
20' 15
tj
Elevation View
8
. Water level
50'
Section A -A
N.T.S.
Figure 4.3 Wheel Wash
Notes:
1. Asphalt construction entrance 6 in. asphalt treated base (ATB).
2. 3 -inch trash pump with floats on the suction hose.
3. Midpoint spray nozzles, if needed.
4. 6 -inch sewer pipe with butterfly valves. Bottom one is a drain. Locate top pipe's invert 1 foot
above bottom of wheel wash.
5. 8 foot x 8 foot sump with 5 feet of catch. Build so can be cleaned with trackhoe.
6. Asphalt curb on the low road side to direct water back to pond.
7. 6 -inch sleeve under road.
8. Ball valves.
9. 15 foot. ATB apron to protect ground from splashing water.
February 2005
Volume 11— Construction Stormwater Pollution Prevention 4-11
BMP C107: Construction Road/Parking Area Stabilization
Purpose Stabilizing subdivision roads, parking areas, and other onsite vehicle
transportation routes immediately after grading reduces erosion caused by
construction traffic or runoff.
• Roads or parking areas shall be stabilized wherever they are constructed,
whether permanent or temporary, for use by construction traffic.
• Fencing (see BMPs C103 and C104) shall be installed, if necessary, to
limit the access of vehicles to only those roads and parking areas that
are stabilized.
Design and • On areas that will receive asphalt as part of the project, install the first
Installation lift as soon as possible.
Specifications • A 6 -inch depth of 2- to 4 -inch crushed rock, gravel base, or crushed
surfacing base course shall be applied immediately after grading or
utility installation. A 4 -inch course of asphalt treated base (ATB) may
also be used, or the road/parking area may be paved. It may also be
possible to use cement or calcium chloride for soil stabilization. If
cement or cement kiln dust is used for roadbase stabilization, pI-I
monitoring and BMPs are necessary to evaluate and minimize the
effects on stormwater. If the area will not be used for permanent roads,
parking areas, or structures, a 6 -inch depth of hog fuel may also be
used, but this is likely to require more maintenance. Whenever
possible, construction roads and parking areas shall be placed on a firm,
compacted subgrade.
• Temporary road gradients shall not exceed 15 percent. Roadways shall
be carefully graded to drain. Drainage ditches shall be provided on each
side of the roadway in the case of a crowned section, or on one side in the
case of a super -elevated section. Drainage ditches shall be directed to a
sediment control BMP.
• Rather than relying on ditches, it may also be possible to grade the road
so that runoff sheet -flows into a heavily vegetated area with a well-
developed topsoil. Landscaped areas are not adequate. If this area has at
least 50 feet of vegetation, then it is generally preferable to use the
vegetation to treat runoff, rather than a sediment pond or trap. The 50
feet shall not include wetlands. If runoff is allowed to sheetflow through
'adjacent vegetated areas, it is vital to design the roadways and parking
areas so that no concentrated runoff is created.
• Storm drain inlets shall be protected to prevent sediment -laden water
entering the storm drain system (see BMP C220).
Maintenance • Inspect stabilized areas regularly, especially after large storm events.
Standards • Crushed rock, gravel base, hog fuel, etc. shall be added as required to
maintain a stable driving surface and to stabilize any areas that have
eroded.
• Following construction, these areas shall be restored to pre -construction
condition or better to prevent future erosion.
Conditions of Use
4-12 Volume 11— Construction Stormwater Pollution Prevention February 2005
BMP C120: Temporary and Permanent Seeding
Purpose
Conditions of Use
Design and
Installation
Specifications
Seeding is intended to reduce erosion by stabilizing exposed soils. A
well-established vegetative cover is one of the most effective methods of
reducing erosion.
• Seeding may be used throughout the project on disturbed areas that
have reached final grade or that will remain unworked for more than
30 days.
• Channels that will be vegetated should be installed before major
earthwork and hydroseeded with a Bonded Fiber Matrix. The
vegetation should be well established (i,e., 75 percent cover) before
water is allowed to flow in the ditch. With channels that will have
high flows, erosion control blankets should be installed over the
hydroseed. If vegetation cannot be established from seed before water
is allowed in the ditch, sod should be installed in the bottom of the
ditch over hydromulch and blankets.
• Retention/detention ponds should be seeded as required.
• Mulch is required at all times because it protects seeds from heat,
moisture loss, and transport due to runoff.
• All disturbed areas shall be reviewed in late August to early September
and all seeding should be completed by the end of September.
Otherwise, vegetation will not establish itself enough to provide more
than average protection.
• At final site stabilization, all disturbed areas not otherwise vegetated or
stabilized shall be seeded and mulched. Final stabilization means the
completion of all soil disturbing activities at the site and the
establishment of a permanent vegetative cover, or equivalent
permanent stabilization measures (such as pavement, riprap, gabions
or geotextiles) which will prevent erosion.
• Seeding should be done during those seasons most conducive to
growth and will vary with the climate conditions of the region.
Isocal experience should be used to determine the appropriate
seeding periods.
• The optimum seeding windows for western Washington are April 1
through June 30 and September 1 through October 1. Seeding that
occurs between July 1 and August 30 will require irrigation until 75
percent grass cover is established. Seeding that occurs between
October 1 and March 30 will require a mulch or plastic cover until
75 percent grass cover is established.
• To prevent seed from being washed away, confirm that all required
surface water control measures have been installed.
February 2005
Volume If — Construction Stormwater Pollution Prevention 4-13
• The seedbed should be firm and rough. All soil should be roughened
no matter what the slope. If compaction is required for engineering
purposes, slopes must be track walked before seeding. Backblading or
smoothing of slopes greater than 4:1 is not allowed if they are to be
seeded.
• New and more effective restoration -based landscape practices rely on
deeper incorporation than that provided by a simple single -pass
rototilling treatment. Wherever practical the subgrade should be
initially ripped to improve long-term permeability, infiltration, and
water inflow qualities. At a minimum, permanent areas shall use soil
amendments to achieve organic matter and permeability performance
defined in engineered soil/landscape systems. For systems that are
deeper than 8 inches the rototilling process should be done in multiple
lifts, or the prepared soil system shall be prepared properly and then
placed to achieve the specified depth.
• Organic matter is the most appropriate form of "fertilizer" because it
provides nutrients (including nitrogen, phosphorus, and potassium) in
the least water-soluble form. A natural system typically releases 2-10
percent of its nutrients annually. Chemical fertilizers have since been
formulated to simulate what organic matter does naturally.
• In general, 10-4-6 N -P -K (nitrogen -phosphorus -potassium) fertilizer
can be used at a rate of 90 pounds per acre. Slow-release fertilizers
should always be used because they are more efficient and have fewer
environmental impacts. It is recommended that areas being seeded for
final landscaping conduct soil tests to determine the exact type and
quantity of fertilizer needed. This will prevent the over -application of
fertilizer. Fertilizer should not be added to the hydromulch machine
and agitated more than 20 minutes before it is to be used. If agitated
too much, the slow-release coating is destroyed.
• There are numerous products available on the market that take the
place of chemical fertilizers. These include several with seaweed
extracts that are beneficial to soil microbes and organisms. If 100
percent cottonseed meal is used as the mulch in hydroseed, chemical
fertilizer may not be necessary. Cottonseed meal is a good source of
long-term, slow-release, available nitrogen.
• 1-lydroseed applications shall include a minimum of 1,500 pounds per
acre of mulch with 3 percent tackifier. Mulch may be made up of 100
percent: cottonseed meal; fibers made of wood, recycled cellulose,
hemp, and kenaf; compost; or blends of these. Tackifier shall be plant -
based, such as guar or alpha plantago, or chemical -based such as
polyacrylamide or polymers. Any mulch or tackifier product used
shall be installed per manufacturer's instructions. Generally, mulches
come in 40-50 pound bags. Seed and fertilizer are added at time of
application.
4-14 Volume 11— Construction Stormwater Pollution Prevention February 2005
• Mulch is always required for seeding. Mulch can be applied on top of
the seed or simultaneously by hydroseeding.
• On steep slopes, Bonded Fiber Matrix (BFM) or Mechanically Bonded
Fiber Matrix (MBFM) products should be used. BFM/MBFM
products are applied at a minimum rate of 3,000 pounds per acre of
mulch with approximately 10 percent tackifier. Application is made
so that a minimum of 95 percent soil coverage is achieved. Numerous
products are available commercially and should be installed per
manufacturer's instructions. Most products require 24-36 hours to
cure before a rainfall and cannot be installed on wet or saturated soils.
Generally, these products come in 40-50 pound bags and include all
necessary ingredients except for seed and fertilizer.
BFMs and MBFMs have some advantages over blankets:
• No surface preparation required;
• Can be installed via helicopter in remote areas;
• On slopes steeper than 2.5:1, blanket installers may need to be roped
and harnessed for safety;
• They are at least $1,000 per acre cheaper installed.
In most cases, the shear strength of blankets is not a factor when used on
slopes, only when used in channels. BFMs and MBFMs are good
alternatives to blankets in most situations where vegetation establishment
is the goal.
• When installing seed via hydroseeding operations, only about 1/3 of
the seed actually ends up in contact with the soil surface. This reduces
the ability to establish a good stand of grass quickly. One way to
overcome this is to increase seed quantities by up to 50 percent.
• Vegetation establishment can also be enhanced by dividing the
hydromulch operation into two phases:
1. Phase 1- Install all seed and fertilizer with 25-30 percent mulch
and tackifier onto soil in the first lift;
2. Phase 2- Install the rest of the mulch and tackifier over the first lift.
An alternative is to install the mulch, seed, fertilizer, and tackifier in one
lift. Then, spread or blow straw over the top of the hydromulch at a rate of
about 800-1000 pounds per acre. Hold straw in place with a standard
tackifier. Both of these approaches will increase cost moderately but will
greatly improve and enhance vegetative establishment. The increased cost
may be offset by the reduced need for:
1. Irrigation
2. Reapplication of mulch
3. Repair of failed slope surfaces
February 2005
Volume 11— Construction Stormwater Pollution Prevention 4-15
This technique works with standard hydromulch (1,500 pounds per acre
minimum) and BFM/MBFMs (3,000 pounds per acre minimum).
• Areas to be permanently landscaped shall provide a healthy topsoil
that reduces the need for fertilizers, improves overall topsoil quality,
provides for better vegetal health and vitality, improves hydrologic
characteristics, and reduces the need for irrigation. This can be
accomplished in a number of ways:
Recent research has shown that the best method to improve till soils is
to amend these soils with compost. The optimum mixture is
approximately two parts soil to one part compost. This equates to 4
inches of compost mixed to a depth of 12 inches in till soils. Increasing
the concentration of compost beyond this level can have negative
effects on vegetal health, while decreasing the concentrations can
reduce the benefits of amended soils. Please note: The compost should
meet specifications for Grade A quality compost in Ecology
Publication 94-038.
Other soils, such as gravel or cobble outwash soils, may require
different approaches. Organics and fines easily migrate through the
loose structure of these soils. Therefore, the importation of at least 6
inches of quality topsoil, underlain by some type of filter fabric to
prevent the migration of fines, may be more appropriate for these soils.
Areas that already have good topsoil, such as undisturbed areas, do not
require soil amendments.
• Areas that will be seeded only and not landscaped may need compost
or meal -based mulch included in the hydroseed in order to establish
vegetation. Native topsoil should be re -installed on the disturbed soil
surface before application.
• Seed that is installed as a temporary measure may be installed by hand
if it will be covered by straw, mulch, or topsoil. Seed that is installed
as a permanent measure may be installed by hand on small areas
(usually less than 1 acre) that will be covered with mulch, topsoil, or
erosion blankets. The seed mixes listed below include recommended
mixes for both temporary and permanent seeding. These mixes, with
the exception of the wetland mix, shall be applied at a rate of 120
pounds per acre. This rate can be reduced if soil amendments or slow-
release fertilizers are used. Local suppliers or the local conservation
district should be consulted for their recommendations because the
appropriate mix depends on a variety of factors, including location,
exposure, soil type, slope, and expected foot traffic. Alternative seed
mixes approved by the local authority may be used.
4-16 Volume 1l — Construction Stormwater Pollution Prevention February 2005
Table 4.1 represents the standard mix for those areas where just a
temporary vegetative cover is required.
Table 4.1
Temporary Erosion Control Seed Mix
% Weight
% Purity
% Germination
Chewings or annual blue grass
Festuca rubra var. commutata or Poa anna
40
98
90
Perennial rye -
Lolimn perenne
50
98
90
Redtop or colonial bentgrass
Agrostis alba or Agrostis tennis
5
92
85
White dutch clover
Trifolnun repens
5
98
90
Table 4.2 provides just one recommended possibility for landscaping seed.
Table 4.2
Landscaping Seed Mix
% Weight % Purity % Germination
Perennial rye blend
Lolhan perenne
70 98
90
Chewings and red fescue blend
Festuca rubra var. commutate:
or Festuca rubra
30 98
90
This turf seed mix in Table 4.3 is for dry situations where there is no need
for much water. The advantage is that this mix requires very little
maintenance.
Table 4.3
Low -Growing Turf Seed Mix
% Weight
% Weight % Purity % Germination
Dwarf tall fescue (several varieties)
Festuca arundinacea var.
45
98
90
Dwarf perennial rye (Barclay)
Lolium perenne var. barclay
30
98
90
Red fescue
Festuca rubra
20
98
90
Colonial bentgrass
Agrostis tenuis
5
98
90
Table 4.4 presents a mix recommended for bioswales and other
intermittently wet areas.
Table 4.4
Bioswale Seed Mix*
% Weight
% Purity % Germination
Tall or meadow fescue
Festuca arnndinacea or Festuca elatior
75-80
98 90
Seaside/Creeping bentgrass
Agrostis palustris
10-15
92 85
Redtop bentgrass
Agrostis alba or Agrostis gigantea
5-10
90 80
* Modified Briargreen, Inc. Hydroseeding Guide Wetlands Seed Mir
February 2005 Volume 11— Construction Stormwater Pollution Prevention
4-17
The seed mix shown in Table 4.5 is a recommended low -growing,
relatively non-invasive seed mix appropriate for very wet areas that are
not regulated wetlands. Other mixes may be appropriate, depending on
the soil type and hydrology of the area. Recent research suggests that
bentgrass (agrostis sp.) should be emphasized in wet -area seed mixes.
Apply this mixture at a rate of 60 pounds per acre.
* Modified Briargreen, Inc. Hydroseeding Guide Wetlands Seed Mix
The meadow seed mix in Table 4.6 is recommended for areas that will be
maintained infrequently or not at all and where colonization by native
plants is desirable. Likely applications include rural road and utility right-
of-way. Seeding should take place in September or very early October in
order to obtain adequate establishment prior to the winter months. The
appropriateness of clover in the mix niay need to be considered, as this can
be a fairly invasive species. If the soil is amended, the addition of clover
may not be necessary.
Table 4.6
Meadow Seed Mix
Table 4.5
Wet Area Seed Mix*
% Weight
% Purity % Germination
% Weight % Purity % Germination
Tall or meadow fescue
Festuca arundinacea or
Festuca elatior
60-70
98
90
Seaside/Creeping bentgrass
Agrostis palustris
10-15
98
85
Meadow foxtail
Alepocurus pratensis
10-15
90
80
Alsike clover
Trifolirun hybridum
1-6
98
90
Redtop bentgrass
Agrostis alba
1-6
92
_
85
* Modified Briargreen, Inc. Hydroseeding Guide Wetlands Seed Mix
The meadow seed mix in Table 4.6 is recommended for areas that will be
maintained infrequently or not at all and where colonization by native
plants is desirable. Likely applications include rural road and utility right-
of-way. Seeding should take place in September or very early October in
order to obtain adequate establishment prior to the winter months. The
appropriateness of clover in the mix niay need to be considered, as this can
be a fairly invasive species. If the soil is amended, the addition of clover
may not be necessary.
Table 4.6
Meadow Seed Mix
% Weight
% Purity % Germination
Redtop or Oregon bentgrass
Agrostis alba or Agrostis oregonensis
20
92 85
Red fescue
Festuca rubra
70
98 90
White dutch clover
Trifolium repens
10
98 90
Maintenance • Any seeded areas that fail to establish at least 80 percent cover (100
Standards percent cover for areas that receive sheet or concentrated flows) shall
be reseeded. If reseeding is ineffective, an alternate method, such as
sodding, mulching, or nets/blankets, shall be used. If winter weather
prevents adequate grass growth, this time limit may be relaxed at the
discretion of the local authority when sensitive areas would otherwise
be protected.
4-18 Volume 11— Construction Stormwater Pollution Prevention February 2005
• After adequate cover is achieved, any areas that experience erosion
shall be reseeded and protected by mulch. If the erosion problem is
drainage related, the problem shall be fixed and the eroded area
reseeded and protected by mulch.
• Seeded areas shall be supplied with adequate moisture, but not watered
to the extent that it causes runoff.
February 2005
Volume 11— Construction Stormwater Pollution Prevention 4-19
BMP C121: Mulching
Purpose
The purpose of mulching soils is to provide immediate temporary
protection from erosion. Mulch also enhances plant establishment by
conserving moisture, holding fertilizer, seed, and topsoil in place, and
moderating soil temperatures. There is an enormous variety of mulches
that can be used. Only the most common types are discussed in this
section.
Conditions of Use As a temporary cover measure, mulch should be used:
• On disturbed areas that require cover measures for less than 30 days.
• As a cover for seed during the wet season and during the hot summer
months.
• During the wet season on slopes steeper than 31-1:1V with more than 10
feet of vertical relief.
• Mulch may be applied at any time of the year and must be refreshed
periodically.
Design and For mulch materials, application rates, and specifications, see Table 4.7.
Installation Note: Thicknesses may be increased for disturbed areas in or near
Specifications sensitive areas or other areas highly susceptible to erosion.
Mulch used within the ordinary high-water mark of surface waters should
be selected to minimize potential flotation of organic matter. Composted
organic materials have higher specific gravities (densities) than straw,
wood, or chipped material.
Maintenance • The thickness of the cover must be maintained.
Standards • Any areas that experience erosion shall be remulched and/or protected
with a net or blanket. If the erosion problem is drainage related, then
the problem shall be fixed and the eroded area remulched.
4-20 Volume 11— Construction Stormwater Pollution Prevention February 2005
February 2005
Volume 11— Construction Stormwater Pollution Prevention 4-21
Table 4.7
Mulch Standards and Guidelines
Mulch
Material
Quality Standards
Application
Rates Remarks
Straw
Air-dried; free from
undesirable seed and
coarse material.
2"-3" thick; 5
bales per 1000 sf
or 2-3 tons per
acre
Cost-effective protection when applied with adequate
thickness. Hand -application generally requires greater
thickness than blown straw. The thickness of straw may be
reduced by half when used in conjunction with seeding. in
windy areas straw must be held in place by crimping, using a
tackifier, or covering with netting. Blown straw always has
to be held in place with a tackifier as even light winds will
blow it away. Straw, however, has several deficiencies that
should be considered whcn selecting mulch materials. It
often introduces and/or encourages the propagation of weed
species and it has no significant long-term benefits. Straw
should be used only if mulches with Tong -tern benefits are
unavailable locally. It should also not be used within the
ordinary high-water elevation of surface waters (due to
flotation).
l-Iydromulch
No growth
inhibiting factors.
Approx. 25-30
lbs per 1000 sf
or 1500 - 2000
IUs per acre
Shall be applied with hydrornulcher. Shall not be used
without seed and tackifier unless the application rate is at
least doubled. Fibers longer than about %-1 inch clog
hydromulch equipment. Fibers should be kept to less than %
inch.
Composted
Mulch and
Compost
No visible water or
dust during
handling. Must be
purchased from
supplier with Solid
Waste Handling
Permit (unless
exempt).
2" thick min.;
approx. 100 tons
per acre (approx.
800 lbs per yard)
More effective control can be obtained by increasing
thickness to 3". Excellent mulch for protecting final grades
until landscaping because it can be directly seeded or tilled
into soil as an amendment. Composted mulch has a coarser
size gradation than compost. It is more stable and practical
to use in wet areas and during rainy weather conditions.
Chipped Sitc
Vegetation
Average size shall
be several inches.
Gradations from
fines to 6 inches in
length for texture,
variation, and
interlocking
properties.
2" minimum
thickness
This is a cost-effective way to dispose of debris from
clearing and grubbing, and it eliminates the problems
associated with burning. Generally, it should not be used on
slopes above approx. 10% because of its tendency to be
transported by runoff. It is not recommended within 200
feet of surface waters. If seeding is expected shortly after
mulch, the decomposition of the chipped vegetation may tie
up nutrients important to grass establishment.
Wood -based
Mulch
No visible water or
dust during
handling. Must be
purchased from a
supplier with a Solid
Waste Handling
Permit or one
exempt from solid
waste regulations.
2" thick; approx.
100 tons per acre
(approx. 800 lbs.
per cubic yard)
This material is often called "hog or hogged fuel." It is
usable as a material for Stabilized Construction Entrances
(BMP C105) and as a mulch. The use of mulch ultimately
improves the organic matter in the soil. Special caution is
advised regarding the source and composition of wood -
based mulches. Its preparation typically does not provide
any weed seed control, so evidence of residual vegetation in
its composition or known inclusion of weed plants or seeds
should be monitored and prevented (or minimized).
February 2005
Volume 11— Construction Stormwater Pollution Prevention 4-21
BMP C123: Plastic Covering
Purpose Plastic covering provides immediate, short-term erosion protection to
slopes and disturbed areas.
Conditions of • Plastic covering may be used on disturbed areas that require cover
Use measures for less than 30 days, except as stated below.
• Plastic is particularly useful for protecting cut and fill slopes and
stockpiles. Note: The relatively rapid breakdown of most polyethylene
sheeting makes it unsuitable for long-term (greater than six months)
applications.
• Clear plastic sheeting can be used over newly -seeded areas to create a
greenhouse effect and encourage grass growth if the hydrosced was
installed too late in the season to establish 75 percent grass cover, or if
the wet season started earlier than normal. Clear plastic should not be
used for this purpose during the summer months because the resulting
high temperatures can kill the grass.
• Due to rapid runoff caused by plastic sheeting, this method shall not be
used upslope of areas that might be adversely impacted by
concentrated runoff Such areas include steep and/or unstable slopes.
• While plastic is inexpensive to purchase, the added cost of installation,
maintenance, removal, and disposal make this an expensive material,
up to $1.50-2.00 per square yard.
• Whenever plastic is used to protect slopes, water collection measures
must be installed at the base of the slope. These measures include
plastic -covered berms, channels, and pipes used to covey clean
rainwater away from bare soil and disturbed areas. At no time is clean
runoff from a plastic covered slope to be mixed with dirty runoff from
a project.
• Other uses for plastic include:
1. Temporary ditch liner;
2. Pond liner in temporary sediment pond;
3. Liner for bermed temporary fuel storage area if plastic is not
reactive to the type of fuel being stored;
4. Emergency slope protection during heavy rains; and,
5. Temporary drainpipe ("elephant trunk") used to direct water.
4-26 Volume 11— Construction Stormwater Pollution Prevention February 2005
Design and • Plastic slope cover must be installed as follows:
Installation 1. Run plastic up and down slope, not across slope;
Specifications
2. Plastic may be installed perpendicular to a slope if the slope length
is less than 10 feet;
3. Minimum of 8 -inch overlap at seams;
4. On long or wide slopes, or slopes subject to wind, all seams should
be taped;
5. Place plastic into a small (12 -inch wide by 6 -inch deep) slot trench
at the top of the slope and backfill with soil to keep water from
flowing underneath;
6. Place sand filled burlap or geotextile bags every 3 to 6 feet along
seams and pound a wooden stake through each to hold them in
place;
7. Inspect plastic for rips, tears, and open seams regularly and repair
immediately. This prevents high velocity runoff from contacting
bare soil which causes extreme erosion;
8. Sandbags may be lowered into place tied to ropes. However, all
sandbags must be staked in place.
• Plastic sheeting shall have a minimum thickness of 0.06 millimeters.
• If erosion at the toe of a slope is likely, a gravel berrn, riprap, or other
suitable protection shall be installed at the toe of the slope in order to
reduce the velocity of runoff.
Maintenance • Torn sheets must be replaced and open seams repaired.
Standards
• If the plastic begins to deteriorate due to ultraviolet radiation, it must
be completely removed and replaced.
• When the plastic is no longer needed, it shall be completely removed.
• Dispose of old tires appropriately.
February 2005
Volume 11— Construction Stormwater Pollution Prevention 4-27
BMP C140: Dust Control
Purpose Dust control prevents wind transport of dust from disturbed soil surfaces
onto roadways, drainage ways, and surface waters:
Conditions of Use • In areas (including roadways) subject to surface and air movement of
dust where on-site and off-site impacts to roadways, drainage ways, or
surface waters are likely.
Design and • Vegetate or mulch areas that will not receive vehicle traffic. In areas
Installation where planting, mulching, or paving is impractical, apply gravel or
Specifications landscaping rock.
• Limit dust generation by clearing only those areas where immediate
activity will take place, leaving the remaining area(s) in the original
condition, if stable. Maintain the original ground cover as long as
practical.
• Construct natural or artificial windbreaks or windscreens. These may
be designed as enclosures for small dust sources.
• Sprinkle the site with water until surface is wet. Repeat as needed. To
prevent carryout of mud onto street, refer to Stabilized Construction
Entrance (BMP C105).
• Irrigation water can be used for dust control. Irrigation systems should
be installed as a first step on sites where dust control is a concern.
• Spray exposed soil areas with a dust palliative, following the
manufacturer's instructions and cautions regarding handling and
application. Used oil is prohibited from use as a dust suppressant.
Local governments may approve other dust palliatives such as calcium
chloride or PAM.
• PAM (BMP C126) added to water at a rate of 0.5 lbs. per 1,000
gallons of water per acre and applied from a water truck is more
effective than water alone. This is due to the increased infiltration of
water into the soil and reduced evaporation. In addition, small soil
particles are bonded together and are not as easily transported by wind.
Adding PAM may actually reduce the quantity of water needed for
dust control, especially in eastern Washington. Since the wholesale
cost of PAM is about $ 4.00 per pound, this is an extremely cost-
effective dust control method.
Techniques that can be used for unpaved roads and Tots include:
• Lower speed limits. High vehicle speed increases the amount of dust
stirred up from unpaved roads and lots.
• Upgrade the road surface strength by improving particle size, shape,
and mineral types that make up the surface and base materials.
4-40
Volume !1— Construction Stormwater Pollution Prevention February 2005
Maintenance
Standards
• Add surface gravel to reduce the source of dust emission. Limit the
amount of fine particles (those smaller than .075 mm) to I0 to 20
percent.
• Use geotextile fabrics to increase the strength of new roads or roads
undergoing reconstruction.
• Encourage the use of alternate, paved routes, if available.
• Restrict use by tracked vehicles and heavy trucks to prevent damage to
road surface and base.
• Apply chemical dust suppressants using the admix method, blending
the product with the top few inches of surface material. Suppressants
may also be applied as surface treatments.
• Pave unpaved permanent roads and other trafficked areas.
• Use vacuum street sweepers.
• Remove mud and other dirt promptly so it does not dry and then turn
into dust.
• Limit dust -causing work on windy days.
• Contact your local Air Pollution Control Authority for guidance and
training on other dust control measures. Compliance with the local Air
Pollution Control Authority constitutes compliance with this BMP.
Respray area as necessary to keep dust to a minimum.
February 2005
Volume 11— Construction Stormwater Pollution Prevention 4-41
BMP C150: Materials On Hand
Purpose Quantities of erosion prevention and sediment control materials can be
kept on the project site at all times to be used for emergency situations
such as unexpected heavy summer rains. Having these materials on-site
reduces the time needed to implement BMPs when inspections indicate
that existing BMPs are not meeting the Construction SWPPP
requirements. In addition, contractors can save money by buying some
materials in bulk and storing them at their office or yard.
Conditions of Use • Construction projects of any size or type can benefit from having
materials on hand. A small commercial development project could
have a roll of plastic and some gravel available for immediate
protection of bare soil and temporary bene construction. A large
earthwork project, such as highway construction, might have several
tons of straw, several rolls of plastic, flexible pipe, sandbags,
geotextile fabric and steel "'I"' posts.
• Materials are stockpiled and readily available before any site clearing,
grubbing, or earthwork begins. A large contractor or developer could
keep a stockpile of materials that are available to be used on several
projects.
• If storage space at the project site is at a premium, the contractor could
maintain the materials at their office or yard. The office or yard must
be less than an hour from the project site.
Design and Depending on project type, size, complexity, and length, materials and
Installation quantities will vary. A good minimum that will cover numerous situations
Specifications includes:
Material
Measure
Quantity
1-2
Clear Plastic, 6 mil
100 foot roll
Drainpipe, 6 or 8 inch diameter
25 foot section
4-6
Sandbags, filled
each
25-50
Straw Bales for mulching,
Quarry Spalls
approx. 50#each _
ton
10-20
2-4
Washed Gravel
cubic yard
2-4
1-2
Geotextile Fabric
100 foot roll
Catch Basin Inserts
each
2-4
Steel "T" Posts
each
12-24
Maintenance • All materials with the exception of the quarry spalls, steel "T" posts,
Standards and gravel should be kept covered and out of both sun and rain.
• Re -stock materials used as needed.
4-42 Volume 11 — Construction Stormwater Pollution Prevention February 2005
BMP C153: Material Delivery, Storage and Containment
Purpose
Prevent, reduce, or eliminate the discharge of pollutants from
material delivery and storage to the stormwater system or
watercourses by minimizing the storage of hazardous materials
onsite, storing materials in a designated area, and installing
secondary containment.
Conditions of Use These procedures are suitable for use at all construction sites with
delivery and storage of the following materials:
• Petroleum products such as fuel, oil and grease
• Soil stabilizers and binders (e.g. Polyacrylamide)
• Fertilizers, pesticides and herbicides
• Detergents
• Asphalt and concrete compounds
Design and
Installation
Specifications
• I-Iazardous chemicals such as acids, lime, adhesives, paints, solvents
and curing compounds
• Any other material that may be detrimental if released to the
environment
The following steps should be taken to minimize risk:
• Temporary storage area should be located away from vehicular traffic,
near the construction entrance(s), and away from waterways or storm
drains.
• Material Safety Data Sheets (MSDS) should be supplied for all
materials stored. Chemicals should be kept in their original labeled
containers.
• Hazardous material storage on-site should be minimized.
• I-Iazardous materials should be handled as infrequently as possible.
• During the wet weather season (Oct 1 — April 30), consider storing
materials in a covered area.
• Materials should be stored in secondary containments, such as earthen
dike, horse trough, or even a children's wading pool for non-reactive
materials such as detergents, oil, grease, and paints. Small amounts of
material may be secondarily contained in "bus boy" trays or concrete
mixing trays.
• Do not store chemicals, drums, or bagged materials directly on the
ground. Place these items on a pallet and, when possible, in secondary
containment.
February 2005
Volume 11— Construction Stormwater Pollution Prevention 4-45
• If drums must be kept uncovered, store them at a slight angle to reduce
ponding of rainwater on the lids to reduce corrosion. Domed plastic
covers are inexpensive and snap to the top of drums, preventing water
from collecting.
Material Storage Areas and Secondary Containment Practices:
• Liquids, petroleum products, and substances listed in 40 CFR Parts
110, 117, or 302 shall be stored in approved containers and drums and
shall not be overfilled. Containers and drums shall be stored in
temporary secondary containment facilities.
• Temporary secondary containment facilities shall provide for a spill
containment volume able to contain precipitation from a 25 year, 24
hour storm event, plus 10% of the total enclosed container volume of
all containers, or 110% of the capacity of the largest container within
its boundary, whichever is greater.
• Secondary containment facilities shall be impervious to the materials
stored therein for a minimum contact time of 72 hours.
• Secondary containment facilities shall be maintained free of
accumulated rainwater and spills. In the event of spills or leaks,
accumulated rainwater and spills shall be collected and placed into
drums. These liquids shall be handled as hazardous waste unless
testing determines them to be non -hazardous.
• Sufficient separation should be provided between stored containers to
allow for spill cleanup and emergency response access.
• During the wet weather season (Oct 1 -- April 30), each secondary
containment facility shall be covered during non -working days, prior
to and during rain events.
• Keep material storage areas clean, organized and equipped with an
ample supply of appropriate spill clean-up material (spill kit).
• The spill kit should include, at a minimum:
• 1 -Water Resistant Nylon Bag
• 3 -Oil Absorbent Socks 3"x 4'
• 2 -Oil Absorbent Socks 3"x 10'
• 12 -Oil Absorbent Pads 17"x19"
• 1 -Pair Splash Resistant Goggles
• 3 -Pair Nitrile Gloves
• 10 -Disposable Bags with Ties
• Instructions
4-46 Volume 11— Construction Stormwater Pollution Prevention February 2005
BMP C160: Certified Erosion and Sediment Control Lead
Purpose
The project proponent designates at least one person as the responsible
representative in charge of erosion and sediment control (ESC), and water
quality protection. The designated person shall be the Certified Erosion
and Sediment Control Lead (CESCL) who is responsible for ensuring
compliance with all local, state, and federal erosion and sediment control
and water quality requirements.
Conditions of Use A CESCL shall be made available on projects one acre or larger that
discharge stormwater to surface waters of the state
Specifications
• The CESCL shall:
• Have a current certificate proving attendance in an erosion and
sediment control training course that meets the minimum ESC
training and certification requirements established by Ecology
(see details below).
Ecology will maintain a list of ESC training and certification
providers at: www.ecv.wa.govrprograrns/wq/stormwater.
OR
• Be a Certified Professional in Erosion and Sediment Control
(CPESC); for additional information go to: www.cpcsc.net
• Certification shall remain valid for three years.
• The CESCL shall have authority to act on behalf of the contractor or
developer and shall be available, on call, 24 hours per day throughout
the period of construction.
• The Construction SWPPP shall include the name, telephone number,
fax number, and address of the designated CESCL.
• A CESCL may provide inspection and compliance services for
multiple construction projects in the same geographic region.
Duties and responsibilities of the CESCL shall include, but are not limited
to the following:
• Maintaining permit file on site at all times which includes the SWPPP
and any associated permits and plans.
• Directing BMP installation, inspection, maintenance, modification,
and removal.
• Updating all project drawings and the Construction SWPPP with
changes made.
February 2005
Volume N — Construction Stormwater Pollution Prevention 4-47
• Keeping daily logs, and inspection reports. Inspection reports should
include:
• Inspection date/time.
• Weather infornnation; general conditions during inspection and
approximate amount of precipitation since the last inspection.
• A summary or list of all BMPs implemented, including
observations of all erosion/sediment control structures or
practices. The following shall be noted:
1) Locations of BMPs inspected,
2) Locations of BMPs that need maintenance,
3) Locations of BMPs that failed to operate as designed or
intended, and
4) Locations of where additional or different BMPs are
required.
• Visual monitoring results, including a description of discharged
stormwater. The presence of suspended sediment, turbid
water, discoloration, and oil sheen shall be noted, as applicable.
• Any water quality monitoring performed during inspection.
• General comments and notes, including a brief description of any
BMP repairs, maintenance or installations made as a result of
the inspection.
• Facilitate, participate in, and take corrective actions resulting from
inspections performed by outside agencies or the owner.
4-48 Volume 11— Construction Stormwater Pollution Prevention February 2005
Minimum Requirements for ESC Training and Certification Courses
General Requirements
1. The course shall teach the construction stormwater pollution prevention guidance
provided in the most recent version of:
a. The Washington State Dept. of Ecology Stormwater Management Manual for
Western Washington,
b. Other equivalent stormwater management manuals approved by Ecology.
2. Upon completion of course, each attendee shall receive documentation of certification,
including, at a minimum, a wallet -sized card that certifies completion of the course.
Certification shall remain valid for three years. Recertification may be obtained by
completing the 8 -hour refresher course or by taking the initial 16 -hour training course
again.
3. The initial certification course shall be a minimum of 16 hours (with a reasonable time
allowance for lunch, breaks, and travel to and from field) and include a field element and
test.
a. The field element must familiarize students with the proper installation,
maintenance and inspection of common erosion and sediment control BMPs
including, but not limited to, blankets, check dams, silt fence, straw mulch,
plastic, and seeding.
b. The test shall be open book and a passing score is not required for certification.
Upon completion of the test, the correct answers shall be provided and discussed.
4. The refresher course shall be a minimum of 8 hours and include a test.
a. The refresher course shall include:
i. Applicable updates to the Stormwater Management Manual that is used to
teach the course, including new or updated BMPs; and
ii. Applicable changes to the NPDES General Permit for Construction
Activities.
b. The refresher course test shall be open book and a passing score is not required
for certification. Upon completion of the test, the correct answers shall be
provided and discussed.
c. The refresher course may be taught using an alternative format (e.g. internet, CD
ROM, etc.) if the module is approved by Ecology.
Required Course Elements
1. Erosion and Sedimentation Impacts
a. Examples/Case studies
February 2005
Volume 11— Construction Stormwater Pollution Prevention 4-49
2. Erosion and Sedimentation Processes
a. Definitions
b. Types of erosion
c. Sedimentation
i. Basic settling concepts
ii. Problems with clays/turbidity
3. Factors Influencing Erosion Potential
a. Soil
b. Vegetation
c. Topography
d. Climate
4. Regulatory Requirements
a. NPDES - Construction Stormwater General Permit
b. Local requirements and permits
c. Other regulatory requirements
5. Stormwater Pollution Prevention Plan (SWPPP)
a. SWPPP is a living document — should be revised as necessary
b. 12 Elements of a SWPPP; discuss suggested BMPs (with examples)
1. Mark Clearing Limits
2. Establish Construction Access
3. Control Flow Rates
4. Install Sediment Controls
5. Stabilize Soils
6. Protect Slopes
7. Protect Drain Inlets
8. Stabilize Channels and Outlets
9. Control Pollutants
10. Control De -watering
11. Maintain BMPs
12. Manage the Project
6. Monitoring/Reporting/Recordkeeping
a. Site inspections/visual monitoring
i. Disturbed areas
ii. BMPs
iii. Stormwater discharge points
b. Water quality sampling/analysis
i. Turbidity
ii. pH
c. Monitoring frequency
i. Set by NPDES permit
ii. Inactive sites - reduced frequency
4-50 Volume 11— Construction Stormwater Pollution Prevention February 2005
d. Adaptive Management
i. When monitoring indicates problem, take appropriate action (e.g.
install/maintain BMPs)
ii. Document the corrective action(s) in SWPPP
e. Reporting
i. Inspection reports/checklists
ii. Discharge Monitoring Reports (DMR)
iii. Non-compliance notification
Instructor Qualifications
1. Instructors must be qualified to effectively teach the required course elements.
2. At a minimum, instructors must have:
a. Current certification as a Certified Professional in Erosion and Sediment Control
(CPESC), or
b. Completed a training program for teaching the required course elements, or
c. The academic credentials and instructional experience necessary for teaching the
required course elements.
3. Instructors must demonstrate competent instructional skills and knowledge of the
applicable subject matter.
February 2005
Volume 11— Construction Stormwater Pollution Prevention 4-51
4.2 Runoff Conveyance and Treatment BMPs
BMP C200: Interceptor Dike and Swale
Purpose Provide a ridge of compacted soil, or a ridge with an upslope swale, at the
top or base of a disturbed slope or along the perimeter of a disturbed
construction area to convey stormwater. Use the dike and/or swale to
intercept the runoff from unprotected areas and direct it to areas where
erosion can be controlled. This can prevent storm runoff from entering the
work area or sediment -laden runoff from leaving the construction site.
Conditions of Use Where the runoff from an exposed site or disturbed slope must be conveyed
to an erosion control facility which can safely convey the stormwater.
• Locate upslope of a construction site to prevent runoff from entering
disturbed area.
• When placed horizontally across a disturbed slope, it reduces the
amount and velocity of runoff flowing down the slope.
• Locate downslope to collect runoff from a disturbed area and direct it
to a sediment basin.
Design and • Dike and/or swale and channel must be stabilized with temporary or
Installation permanent vegetation or other channel protection during construction.
Specifications • Channel requires a positive grade for drainage; steeper grades require
channel protection and check dams.
• Review construction for areas where overtopping may occur.
• Can be used at top of new fill before vegetation is established.
• May be used as a permanent diversion channel to carry the runoff.
• Sub -basin tributary area should be one acre or less.
Design capacity for the peak flow from a 10 -year, 24-hour storm,
assuming a Type IA rainfall distribution, for temporary facilities.
Alternatively, use 1.6 times the 10 -year, 1 -hour flow indicated by an
approved continuous runoff model. For facilities that will also serve
on a permanent basis, consult the local government's drainage
requirements.
Interceptor dikes shall meet the following criteria:
Top Width 2 feet minimum.
Height 1.5 feet minimum on berm.
Side Slope 2:1 or flatter.
Grade Depends on topography, however, dike system minimum is
0.5%, maximum is 1%.
Compaction Minimum of 90 percent ASTM D698 standard proctor.
February 2005 Volume 11- Construction Stormwater Pollution Prevention 4-57
Horizontal Spacing of Interceptor Dikes:
Average Slope Slope Percent Flowpath Length
20H:1 V or less 3-5% 300 feet
(10 to 20)II:1V 5-10% 200 feet
(4 to 10)H:1 V 10-25% 100 feet
(2 to 4)H:1 V 25-50% 50 feet
Stabilization depends on velocity and reach
Slopes <5% Seed and mulch applied within 5 days of dike
construction (see BMP C121, Mulching).
Slopes 5 - 40% Dependent on runoff velocities and dike materials.
Stabilization should be done immediately using either
sod or riprap or other measures to avoid erosion.
• The upslope side of the dike shall provide positive drainage to the dike
outlet. No erosion shall occur at the outlet. Provide energy dissipation
measures as necessary. Sediment -laden runoff must be released
through a sediment trapping facility.
• Minimize construction traffic over temporary dikes. Use temporary
cross culverts for channel crossing.
Interceptor swales shall meet the following criteria:
Bottom Width 2 feet minimum; the bottom shall be level.
Depth 1 -foot minimum.
Side Slope 2:1 or flatter.
Grade Maximum 5 percent, with positive drainage to a
suitable outlet (such as a sediment pond).
Stabilization Seed as per BMA C120, Temporary and Permanent
Seeding, or BMP C202, Channel Lining, 12 inches
thick of riprap pressed into the bank and extending
at least 8 inches vertical from the bottom.
• Inspect diversion dikes and interceptor swales once a week and after
every rainfall. Immediately remove sediment from the flow area.
• Damage caused by construction traffic or other activity must be
repaired before the end of each working day.
Check outlets and make timely repairs as needed to avoid gully formation. When
the area below the temporary diversion dike is permanently stabilized, remove the
dike and fill and stabilize the channel to blend with the natural surface.
4-58 Volume 11— Construction Sformwater Pollution Prevention February 2005
BMP C207: Check Dams
Purpose Construction of small dams across a swale or ditch reduces the velocity of
concentrated flow and dissipates energy at the check dam.
Where temporary channels or permanent channels are not yet vegetated,
channel lining is infeasible, and velocity checks are required.
• Check dams may not be placed in streams unless approved by the State
Department of Fish and Wildlife. Check dams may not be placed in
wetlands without approval from a permitting agency.
• Check dams shall not be placed below the expected backwater from
any salmonid bearing water between October I and May 31 to ensure
that there is no loss of high flow refuge habitat for overwintering
juvenile salmonids and emergent salmonid fry.
Design and Whatever material is used, the dam should form a triangle when viewed
Installation from the side. This prevents undercutting as water flows over the face of
Specifications the dam rather than falling directly onto the ditch bottom.
Check dams in association with sumps work more effectively at slowing
flow and retaining sediment than just a check dam alone. A deep sump
should be provided immediately upstream of the check dam.
• In some cases, if carefully located and designed, check dams can
remain as permanent installations with very minor regrading. They
may be left as either spillways, in which case accumulated sediment
would be graded and seeded, or as check dams to prevent further
sediment from leaving the site.
• Check dams can be constructed of either rock or pea -gravel filled bags.
Numerous new products are also available for this purpose. They tend
to be re -usable, quick and easy to install, effective, and cost efficient.
• Check dams should be placed perpendicular to the flow of water.
• The maximum spacing between the dams shall be such that the toe of
the upstream dam is at the same elevation as the top of the downstream
dam.
Conditions of Use
• Keep the maximum height at 2 feet at the center of the dam.
• Keep the center of the check dam at least 12 inches lower than the
outer edges at natural ground elevation.
• Keep the side slopes of the check dam at 2:1 or flatter.
• Key the stone into the ditch banks and extend it beyond the abutments
a minimum of 18 inches to avoid washouts from overflow around the
dam.
February 2005
Volume 11— Construction Stormwater Pollution Prevention 4-75
• Use filter fabric foundation under a rock or sand bag check dam. If a
blanket ditch liner is used, this is not necessary. A piece of organic or
synthetic blanket cut to fit will also work for this purpose.
• Rock check dams shall be constructed of appropriately sized rock.
The rock must be placed by hand or by mechanical means (no
dumping of rock to form dam) to achieve complete coverage of the
ditch or swale and to ensure that the center of the dam is lower than
the edges. The rock used must be large enough to stay in place given
the expected design flow through the channel.
• In the case of grass -lined ditches and swales, all check dams and
accumulated sediment shall be removed when the grass has matured
sufficiently to protect the ditch or swale - unless the slope of the swale
is greater than 4 percent. The area beneath the check dams shall be
seeded and mulched immediately after dam removal.
• Ensure that channel appurtenances, such as culvert entrances below
check dams, are not subject to damage or blockage from displaced
stones. Figure 4.13 depicts a typical rock check dam.
Maintenance Check dams shall be monitored for performance and sediment
Standards accumulation during and after each runoff producing rainfall. Sediment
shall be removed when it reaches one half the sump depth.
• Anticipate submergence and deposition above the check dam and
erosion from high flows around the edges of the dam.
• If significant erosion occurs between dams, install a protective riprap
liner in that portion of the channel.
4-76 Volume 11— Construction Stormwater Pollution Prevention February 2005
18" (0,5m)
NOTE:
Key stone into channel banks and
extend it beyond the abutments a
minimum of 18" (0.5m) to prevent
flow around dam.
Section A - A
--- 8' (2.4m)
Spacing Between Check Dams
'L' = the distance such that points 'A' and
'B' are of equal elevation.
Figure 4.13 — Check Dams
February 2005
Volume 11— Construction Stormwater Pollution Prevention 4-77
BMP C209: Outlet Protection
Purpose
Conditions of use
Design and
Installation
Specifications
Outlet protection prevents scour at conveyance outlets and minimizes the
potential for downstream erosion by reducing the velocity of concentrated
stormwater flows.
Outlet protection is required at the outlets of all ponds, pipes, ditches, or
other conveyances, and where runoff is conveyed to a natural or manmade
drainage feature such as a stream, wetland, lake, or ditch.
The receiving channel at the outlet of a culvert shall be protected from
erosion by rock lining a minimum of 6 feet downstream and extending up
the channel sides a minimum of 1—foot above the maximum tailwater
elevation or 1 -foot above the crown, whichever is higher. For large pipes
(more than 18 inches in diameter), the outlet protection lining of the
channel is lengthened to four times the diameter of the culvert.
• Standard wingwalls, and tapered outlets and paved channels should
also be considered when appropriate for permanent culvert outlet
protection. (See WSDOT Hydraulic Manual, available through
WSDOT Engineering Publications).
• Organic or synthetic erosion blankets, with or without vegetation, are
usually more effective than rock, cheaper, and easier to install.
Materials can be chosen using manufacturer product specifications.
ASTM test results are available for most products and the designer can
choose the correct material for the expected flow.
• With low flows, vegetation (including sod) can be effective.
• The following guidelines shall be used for riprap outlet protection:
1. If the discharge velocity at the outlet is less than 5 fps (pipe slope
less than 1 percent), use 2 -inch to 8 -inch riprap. Minimum
thickness is 1 -foot.
2. For 5 to 10 fps discharge velocity at the outlet (pipe slope less than
3 percent), use 24 -inch to 4 -foot riprap. Minimum thickness is 2
feet.
3. For outlets at the base of steep slope pipes (pipe slope greater than
10 percent), an engineered energy dissipater shall be used.
• Filter fabric or erosion control blankets should always be used under
riprap to prevent scour and channel erosion.
• New pipe outfalls can provide an opportunity for low-cost fish habitat
improvements. For example, an alcove of low-velocity water can be
created by constructing the pipe outfall and associated energy
dissipater back from the stream edge and digging a channel, over -
widened to the upstream side, from the outfall. Overwintering juvenile
and migrating adult salmonids may use the alcove as shelter during
4-80 Volume 11— Construction Stormwater Pollution Prevention February 2005
Maintenance
Standards
high flows. Bank stabilization, bioengineering, and habitat features
may be required for disturbed areas. See Volume V for more
information on outfall system design.
• Inspect and repair as needed.
• Add rock as needed to maintain the intended function.
• Clean energy dissipater if sediment builds up.
February 2005
Volume 11— Construction Stormwater Pollution Prevention 4-81
BMP C220: Storm Drain Inlet Protection
Purpose To prevent coarse sediment from entering drainage systems prior to
permanent stabilization of the disturbed area.
Conditions of Use
Where storm drain inlets are to be made operational before permanent
stabilization of the disturbed drainage area. Protection should be provided
for all storm drain inlets downslope and within 500 feet of a disturbed or
construction area, unless the runoff that enters the catch basin will be
conveyed to a sediment pond or trap. Inlet protection may be used
anywhere to protect the drainage system. It is likely that the drainage
system will still require cleaning.
Table 4.9 lists several options for inlet protection. All of the methods for
storm drain inlet protection are prone to plugging and require a high
frequency of maintenance. Drainage areas should he limited to 1 acre or
less. Emergency overflows may be required where stormwater ponding
would cause a hazard. If an emergency overflow is provided, additional
end -of -pipe treatment may he required.
Table 4.9
Storm Drain Inlet Protetion
Applicable for
Type of Inlet Emergency Paved! Earthen
Protection Overflow Surfaces
Conditions of Use
Drop Inlet Protection
Excavated drop inlet Yes,
protection temporary
flooding will
occur
Block and gravel drop Yes
inlet protection
Gravel and wire drop No
inlet protection
Catch basin filters Yes
Earthen
Paved or Earthen
Paved or Earthen
Applicable for heavy flows. Easy
to maintain. Large area
Requirement: 30' X 30'Iacre
Applicable for heavy concentrated
flows. Will not pond.
Applicable for heavy concentrated
flows. Will pond. Can withstand
traffic.
Frequent maintenance required.
Curb Inlet Protection
Curb inlet protection Small capacity
with a wooden weir overflow
Block and gravel curb Yes
inlet protection
Paved
Paved
Used for sturdy, more compact
installation.
Sturdy, but limited filtration.
Culvert Inlet Protection
Culvert inlet sediment
trap
18 month expected life.
4-82 Volume 11— Construction Stormwater Pollution Prevention February 2005
Design and Excavated Drop Inlet Protection - An excavated impoundment around the
Installation storm drain. Sediment settles out of the stormwater prior to entering the
Specifications storm drain.
• Depth 1-2 ft as measured from the crest of the inlet structure.
• Side Slopes of excavation no steeper than 2:1.
• Minimum volume of excavation 35 cubic yards.
• Shape basin to fit site with longest dimension oriented toward the
longest inflow area.
• Install provisions for draining to prevent standing water problems.
• Clear the area of all debris.
• Grade the approach to the inlet uniformly.
• Drill weep holes into the side of the inlet.
• Protect weep holes with screen wire and washed aggregate.
• Seal weep holes when removing structure and stabilizing area.
• It may be necessary to build a temporary dike to the down slope side
of the structure to prevent bypass flow.
Block and Gravel Filter - A barrier formed around the storm drain inlet
with standard concrete blocks and gravel. See Figure 4.14.
• Height 1 to 2 feet above inlet.
• Recess the first row 2 inches into the ground for stability.
• Support subsequent courses by placing a 2x4 through the block
opening.
• Do not use mortar.
• Lay some blocks in the bottom row on their side for dewatering the
pool.
• Place hardware cloth or comparable wire mesh with '/z -inch openings
over all block openings.
• Place gravel just below the top of blocks on slopes of 2:1 or flatter.
• An alternative design is a gravel donut.
• Inlet slope of 3:1.
• Outlet slope of 2:1.
• 1 -foot wide level stone area between the structure and the inlet.
• Inlet slope stones 3 inches in diameter or larger.
• Outlet slope use gravel 1/2- to Y4 -inch at a minimum thickness of 1 -foot.
February 2005
Volume 11— Construction Stormwater Pollution Prevention 4-83
Plan View
Drain
Grate
Section A - A
Gravel Backfill —
Concrete Block
Overflow
Wa er
Water 1
Drop Inlet
Concrete
_
Block
Gravel
Backfill
Wire Screen or
Filter Fabric
Ponding Height
Notes:
1. Drop inlet sediment barriers are to be used for small, nearly level drainage areas. (less than 5%)
2. Excavate a basin of sufficient size adjacent to the drop inlet.
3. The top of the structure (ponding height) must be well below the ground elevation downslope to prevent
runoff from bypassing the inlet. A temporary dike may be necessary on the dowslope side of the structure.
Figure 4.14 — Block and Gravel Filter
Gravel and Wire Mesh Filter - A gravel barrier placed over the top of the
inlet. This structure does not provide an overflow.
• Hardware cloth or comparable wire mesh with V2 -inch openings.
• Coarse aggregate.
• Height 1 -foot or more, 18 inches wider than inlet on all sides.
• Place wire mesh over the drop inlet so that the wire extends a
minimum of 1 -foot beyond each side of the inlet structure.
• If more than one strip of mesh is necessary, overlap the strips.
• Place coarse aggregate over the wire mesh.
• The depth of the gravel should be at least 12 inches over the entire
inlet opening and extend at least 18 inches on all sides.
4-84 Volume 11— Construction Stormwater Pollution Prevention February 2005
Catchbasin Filters - Inserts should be designed by the manufacturer for
use at construction sites. The limited sediment storage capacity increases
the amount of inspection and maintenance required, which may be daily
for heavy sediment loads. The maintenance requirements can be reduced
by combining a catchbasin filter with another type of inlet protection.
This type of inlet protection provides flow bypass without overflow and
therefore may be a better method for inlets located along active rights-of-
way.
• 5 cubic feet of storage.
• Dewatering provisions.
• High-flow bypass that will not clog under normal use at a construction
site.
• The catchbasin filter is inserted in the catchbasin just below the
grating.
Curb Inlet Protection with Wooden Weir — Barrier formed around a curb
inlet with a wooden frame and gravel.
• Wire mesh with %z -inch openings.
• Extra strength filter cloth.
• Construct a frame.
• Attach the wire and filter fabric to the frame.
• Pile coarse washed aggregate against wire/fabric.
• Place weight on frame anchors.
Block and Gravel Curb Inlet Protection — Barrier formed around an inlet
with concrete blocks and gravel. See Figure 4.14.
• Wire mesh with V2 -inch openings.
• Place two concrete blocks on their sides abutting the curb at either side
of the inlet opening. These are spacer blocks.
• Place a 2x4 stud through the outer holes of each spacer block to align
the front blocks.
• Place blocks on their sides across the front of the inlet and abutting the
spacer blocks.
• Place wire mesh over the outside vertical face.
• Pile coarse aggregate against the wire to the top of the barrier.
Curb and Gutter Sediment Farrier — Sandbag or rock berm (riprap and
aggregate) 3 feet high and 3 feet wide in a horseshoe shape. See Figure
4.16.
• Construct a horseshoe shaped berm, faced with coarse aggregate if
using riprap, 3 feet high and 3 feet wide, at least 2 feet from the inlet.
• Construct a horseshoe shaped sedimentation trap on the outside of the
berm sized to sediment trap standards for protecting a culvert inlet.
February 2005
Volume 11— Construction Stormwater Pollution Prevention 4-85
Maintenance • Catch basin filters should be inspected frequently, especially after
Standards storm events. If the insert becomes clogged, it should be cleaned or
replaced.
• For systems using stone filters: If the stone filter becomes clogged
with sediment, the stones must be pulled away from the inlet and
cleaned or replaced. Since cleaning of gravel at a construction site
may be difficult, an alternative approach would be to use the clogged
stone as fill and put fresh stone around the inlet.
• Do not wash sediment into storm drains while cleaning. Spread all
excavated material evenly over the surrounding land area or stockpile
and stabilize as appropriate.
4-86 Volume 11- Construction Stormwater Pollution Prevention February 2005
BMP C233: Silt Fence
Purpose
Conditions of Use
Design and
Installation
Specifications
Use of a silt fence reduces the transport of coarse sediment from a
construction site by providing a temporary physical barrier to sediment
and reducing the runoff velocities of overland flow. See Figure 4.19 for
details on silt fence construction.
Silt fence may be used downslope of all disturbed areas.
• Silt fence is not intended to treat concentrated flows, nor is it intended
to treat substantial amounts of overland flow. Any concentrated flows
must be conveyed through the drainage system to a sediment pond.
The only circumstance in which overland flow can be treated solely by
a silt fence, rather than by a sediment pond, is when the area draining
to the fence is one acre or less and flow rates are less than 0.5 cfs.
• Silt fences should not be constructed in streams or used in V-shaped
ditches. They are not an adequate method of silt control for anything
deeper than sheet or overland flow.
Joints in filter fabric shall be spliced al
posts. Use staples, wire rings or
equivalent to attach fabric 10 posts
2"x2" by 14 Ga. wire or
equivalent, if standard
-•----- strength fabric used
ellf11 r1.'.1P.ii.':U.:111„1 611„-L.'L. G'.m
I !� - 6 max--- �I I ,. Minimum 4"x4" trench
Filler fabric
l_ I /
Post spacing may be increased
l0 8' it wire backing is used
/ I
- Backtitl trench with native soil �—
\ or 3f4"-1.5" washed gravel j
2"x2" wood posts. steel fence
posts. or equivalent
E
fV
Figure 4.19 — Silt Fence
• Drainage area of 1 acre or less or in combination with sediment. basin
in a larger site.
• Maximum slope steepness (normal (perpendicular) to fence line) 1:1.
• Maximum sheet or overland flow path length to the fence of 100 feet.
• No flows greater than 0.5 cfs.
• The geotextile used shall meet the following standards. All geotextile
properties listed below are minimum average roll values (i.e., the test
result for any sampled roll in a lot shall meet or exceed the values
shown in Table 4.10):
4"94 Volume II — Construction Stormwater Pollution Prevention February 2005
Table 4.10
Geotextile Standards _
Polymeric Mesh AOS
(ASTM D4751)
Water Permittivity
(ASTM D4491)
0.60 mm maximum for slit film wovens (1130 sieve). 0.30
min maximum for all other geotextile types (#50 sieve).
0.15 mm minimum for all fabric types (#l00 sieve).
0.02 sec minimum
Grab Tensile Strength
(ASTM D4632)
180 lbs. Minimum for extra strength fabric.
100 lbs minimum for standard strength fabric.
Grab Tensile Strength
(ASTM D4632)
30% maximum
Ultraviolet Resistance
(ASTM D4355)
70% minimum
• Standard strength fabrics shall be supported with wire mesh, chicken
wire, 2 -inch x 2 -inch wire, safety fence, or jute mesh to increase the
strength of the fabric. Silt fence materials are available that have
synthetic mesh backing attached.
• Filter fabric material shall contain ultraviolet ray inhibitors and
stabilizers to provide a minimum of six months of expected usable
construction life at a temperature range of 0°F. to 120°F.
• 100 percent biodegradable silt fence is available that is strong, long
lasting, and can be left in place after the project is completed, if
permitted by local regulations.
• Standard Notes for construction plans and specifications follow. Refer
to Figure 4.19 for standard silt fence details.
The contractor shall install and maintain temporary silt fences at the
locations shown in the Plans. The silt fences shall be constructed in
the areas of clearing, grading, or drainage prior to starting those
activities. A silt fence shall not be considered temporary if the silt
fence must function beyond the life of the contract. The silt fence
shall prevent soil carried by runoff water from going beneath, through,
or over the top of the silt fence, but shall allow the water to pass
through the fence.
The minimum height of the top of silt fence shall be 2 feet and the
maximum height shall be 2'/2 feet above the original ground surface.
The geotextile shall be sewn together at the point of manufacture, or at
an approved location as determined by the Engineer, to form geotextile
lengths as required. All sewn seams shall be located at a support post.
Alternatively, two sections of silt fence can be overlapped, provided
the Contractor can demonstrate, to the satisfaction of the Engineer, that
the overlap is long enough and that the adjacent fence sections are
close enough together to prevent silt laden water from escaping
through the fence at the overlap.
February 2005
Volume 11— Construction Stormwater Pollution Prevention 4-95
The geotextile shall be attached on the up-slope side of the posts and
support system with staples, wire, or in accordance with the
manufacturer's recommendations. The geotextile shall be attached to
the posts in a manner that reduces the potential for geotextile tearing at
the staples, wire, or other connection device. Silt fence back-up
support for the geotextile in the form of a wire or plastic mesh is
dependent on the properties of the geotextile selected for use. If wire
or plastic back-up mesh is used, the mesh shall be fastened securely to
the up-slope of the posts with the geotextile being up-slope of the
mesh back-up support.
The geotextile at the bottom of the fence shall be buried in a trench to
a minimum depth of 4 inches below the ground surface. The trench
shall be backfilled and the soil tamped in place over the buried portion
of the geotextile, such that no flow can pass beneath the fence and
scouring can not occur. When wire or polymeric back-up support
mesh is used, the wire or polymeric mesh shall extend into the trench a
minimum of 3 inches.
The fence posts shall be placed or driven a minimum of 18 inches. A
minimum depth of 12 inches is allowed if topsoil or other soft
subgrade soil is not present and a minimum depth of 18 inches cannot
be reached. Fence post depths shall be increased by 6 inches if the
fence is located on slopes of 3:1 or steeper and the slope is
perpendicular to the fence. If required post depths cannot be obtained,
the posts shall be adequately secured by bracing or guying to prevent
overturning of the fence due to sediment loading.
Silt fences shall be located on contour as much as possible, except at
the ends of the fence, where the fence shall be turned uphill such that
the silt fence captures the runoff water and prevents water from
flowing around the end of the fence.
If the fence must cross contours, with the exception of the ends of the
fence, gravel check dams placed perpendicular to the back of the fence
shall be used to minimize concentrated flow and erosion along the
back of the fence. The gravel check dams shall be approximately 1 -
foot deep at the back of the fence. It shall be continued perpendicular
to the fence at the same elevation until the top of the check dam
intercepts the ground surface behind the fence. The gravel check dams
shall consist of crushed surfacing base course, gravel backfill for
walls, or shoulder ballast. The gravel check dams shall be located
every 10 feet along the fence where the fence must cross contours.
The slope of the fence line where contours must be crossed shall not
be steeper than 3:1.
Wood, steel or equivalent posts shall be used. Wood posts shall have
minimum dimensions of 2 inches by 2 inches by 3 feet minimum
length, and shall be free of defects such as knots, splits, or gouges.
4-96 Volume 11— Construction Stormwater Pollution Prevention February 2005
Steel posts shall consist of either size No. 6 rebar or larger, ASTM A
120 steel pipe with a minimum diameter of 1 -inch, U, T, L, or C shape
steel posts with a minimum weight of 1.35 lbs./ft. or other steel posts
having equivalent strength and bending resistance to the post sizes
listed. The spacing of the support posts shall be a maximum of 6 feet.
Fence back-up support, if used, shall consist of steel wire with a
maximum mesh spacing of 2 inches, or a prefabricated polymeric
mesh. The strength of the wire or polymeric mesh shall be equivalent
to or greater than 180 lbs. grab tensile strength. The polymeric mesh
must be as resistant to ultraviolet radiation as the geotextile it supports.
• Silt fence installation using the slicing method specification details
follow. Refer to Figure 4.20 for slicing method details.
The base of both end posts must be at least 2 to 4 inches above the top
of the silt fence fabric on the middle posts for ditch checks to drain
properly. Use a hand level or string level, if necessary, to mark base
points before installation.
Install posts 3 to 4 feet apart in critical retention areas and 6 to 7 feet
apart in standard applications.
Install posts 24 inches deep on the downstream side of the silt fence,
and as close as possible to the fabric, enabling posts to support the
fabric from upstream water pressure.
Install posts with the nipples facing away from the silt fence fabric.
Attach the fabric to each post with three ties, all spaced within the top
8 inches of the fabric. Attach each tie diagonally 45 degrees through
the fabric, with each puncture at least 1 inch vertically apart. In
addition, each tie should be positioned to hang on a post nipple when
tightening to prevent sagging.
Wrap approximately 6 inches of fabric around the end posts and secure
with 3 ties.
No more than 24 inches of a 36 -inch fabric is allowed above ground
level.
The rope lock system must be used in all ditch check applications.
The installation should be checked and corrected for any deviation
before compaction. Use a flat -bladed shovel to tuck fabric deeper into
the ground if necessary.
Compaction is vitally important for effective results. Compact the soil
immediately next to the silt fence fabric with the front wheel of the
tractor, skid steer, or roller exerting at least 60 pounds per square inch.
Compact the upstream side first and then each side twice for a total of
four trips.
February 2005
Volume 11— Construction Stormwater Pollution Prevention 4-97
Maintenance
Standards
• Any damage shall be repaired immediately.
• If concentrated flows are evident uphill of the fence, they must be
intercepted and conveyed to a sediment pond.
• It is important to check the uphill side of the fence for signs of the
fence clogging and acting as a barrier to flow and then causing
channelization of flows parallel to the fence. If this occurs, replace the
fence or remove the trapped sediment.
• Sediment deposits shall either be removed when the deposit reaches
approximately one-third the height of the silt fence, or a second silt
fence shall be installed.
• If the filter fabric (geotextile) has deteriorated due to ultraviolet
breakdown, it shall be replaced.
Pending height
Tex. 24'
Attach fabric to
upstream 1111 •1 pest
FLOW ---
Drive onr each aide .1
slit moo. 2 t. 4tim•.
with done* woman,
00 0..J..0 master y_
POST SPACING:
7• ma% on open run.
4 ma% on pooling ammo
POST DEPTH:
Ae much below ground
e. t*bde above ground
100% e.mp.ed.n
No more than 24" of a 36 fabric
Is allowed above ground.
- Oppration
I�
a>;U, x,. „„ fidni!// % // •2300mm��
%t=iia• "\\\\\\\`\\\\`\\„\"\` ;i1�
Top of Fabric
Sett
t e"
ATTACHMENT OETAgS:
• Gather fabric at posts. IT needed
• Wkre dyne dos per past, all *thin top e• ot fabric.
• Poikton each tie diagon•ly, puncturing hde$ conically
a minimum of T apart
• Hang ea6h rte on a post nipple and Ughten securely.
Use cebhs Ues (501bs) or toll wire.
Roll of at fence
Fabric
above
ground
Silt Fonco
4j.;i..yi 4i •.
Horizontal chisel point
476 mm vddWt)
Slcing blade
(t S mm width)
Post
installed
after
compaction
51:74 -
Completed Instalation
Vibratory plow is not acceptable because of horizontal compaction
Figure 4.20 — Silt Fence Installation by Slicing Method
4-98 Volume 11— Construction Stormwater Pollution Prevention February 2005
BMP C235: Straw Wattles
Purpose
Straw wattles are temporary erosion and sediment control barriers
consisting of straw that is wrapped in biodegradable tubular plastic or
similar encasing material. They reduce the velocity and can spread the
flow of rill and sheet runoff, and can capture and retain sediment. Straw
wattles are typically 8 to 10 inches in diameter and 25 to 30 feet in length.
The wattles are placed in shallow trenches and staked along the contour of
disturbed or newly constructed slopes. See Figure 4.21 for typical
construction details.
Conditions of Use • Disturbed areas that require immediate erosion protection.
• Exposed soils during the period of short construction delays, or over
winter months.
• On slopes requiring stabilization until permanent vegetation can be
established.
• Straw wattles are effective for one to two seasons.
• If conditions are appropriate, wattles can be staked to the ground using
willow cuttings for added revegetation.
• Rilling can occur beneath wattles if not properly entrenched and water
can pass between wattles if not tightly abutted together.
Design Criteria • It is critical that wattles are installed perpendicular to the flow
direction and parallel to the slope contour.
• Narrow trenches should be dug across the slope on contour to a depth
of 3 to 5 inches on clay soils and soils with gradual slopes. On loose
soils, steep slopes, and areas with high rainfall, the trenches should be
dug to a depth of 5 to 7 inches, or 1/2 to 2/3 of the thickness of the
wattle.
• Start building trenches and installing wattles from the base of the slope
and work up. Excavated material should be spread evenly along the
uphill slope and compacted using hand tamping or other methods.
• Construct trenches at contour intervals of 3 to 30 feet apart depending
on the steepness of the slope, soil type, and rainfall. The steeper the
slope the closer together the trenches.
• Install the wattles snugly into the trenches and abut tightly end to end.
Do not overlap the ends.
• Install stakes at each end of the wattle, and at 4 -foot centers along
entire length of wattle.
• If required, install pilot holes for the stakes using a straight bar to drive
holes through the wattle and into the soil.
• At a minimum, wooden stakes should be approximately 3/4 x 3/4 x 24
inches. Willow cuttings or 3/8 -inch rebar can also be used for stakes.
4-100 Volume 11— Construction Stormwater Pollution Prevention February 2005
Maintenance • Stakes should be driven through the middle of the wattle, leaving 2 to 3
Standards inches of the stake protruding above the wattle.
• Wattles may require maintenance to ensure they are in contact with soil
and thoroughly entrenched, especially after significant rainfall on steep
sandy soils.
• Inspect the slope after significant storms and repair any areas where
wattles are not tightly abutted or water has scoured beneath the wattles.
Straw Rolls Must
Be Placed Along
Slope Contours
/ 4 .,-:, `• 1O'-25' (3-8m)
�//\ /
Spacing Depends
on Soil Type and
Slope Steepness
(1.2m)
Adjacent rolls shall
tightly abut
(/
\ &' Sediment, organic macer.
T\\',\' captured behind the rolls.
4`
r.
NOTE:
1. Straw roll installation requires the placement and secure staking of the roll in a trench, 3"-S" (75-125nim)
deep, dug on contour. runoff -intim not be allowed to run under or around roll.
3"-5" (75-125mm)
not to scale
1" X 1" Stake
(25 x 25mm)
•
Figure 4.21 — Straw Wattles
February 2005 Volume Il — Construction Stormwater Pollution Prevention
4-101
BMP C240: Sediment Trap
Purpose
Conditions of Use
A sediment trap is a small temporary ponding area with a gravel outlet
used to collect and store sediment from sites cleared and/or graded during
construction. Sediment traps, along with other perimeter controls, shall be
installed before any land disturbance takes place in the drainage area.
Prior to leaving a construction site, stormwater runoff must pass through a
sediment pond or trap or other appropriate sediment removal best
management practice. Non -engineered sediment traps may be used on-site
prior to an engineered sediment trap or sediment pond to provide
additional sediment removal capacity.
It is intended for use on sites where the tributary drainage area is less than
3 acres, with no unusual drainage features, and a projected build -out time
of six months or less. The sediment trap is a temporary measure (with a
design life of approximately 6 months) and shall be maintained until the
site area is permanently protected against erosion by vegetation and/or
structures.
Sediment traps and ponds are only effective in removing sediment down
to about the medium silt size fraction. Runoff with sediment of finer
grades (fine silt and clay) will pass through untreated, emphasizing the
need to control erosion to the maximum extent first.
Whenever possible, sediment -laden water shall be discharged into onsite,
relatively level, vegetated areas (see BMP C234 — Vegetated Strip). This
is the only way to effectively remove fine particles from runoff unless
chemical treatment or filtration is used. This can be particularly useful
after initial treatment in a sediment trap or pond. The areas of release
must be evaluated on a site -by -site basis in order to determine appropriate
locations for and methods of releasing runoff. Vegetated wetlands shall
not be used for this purpose. Frequently, it may be possible to pump water
from the collection point at the downhill end of the site to an upslope
vegetated area. Pumping shall only augment the treatment system, not
replace it, because of the possibility of pump failure or runoff volume in
excess of pump capacity.
All projects that are constructing permanent facilities for runoff quantity
control should use the rough -graded or final -graded permanent facilities
for traps and ponds. This includes combined facilities and infiltration
facilities. When permanent facilities are used as temporary sedimentation
facilities, the surface area requirement of a sediment trap or pond must be
met. If the surface area requirements are larger than the surface area of
the permanent facility, then the trap or pond shall be enlarged to comply
with the surface area requirement. The permanent pond shall also be
divided into two cells as required for sediment ponds.
4-102 Volume 11— Construction Stormwater Pollution Prevention February 2005
Either a permanent control structure or the temporary control structure
(described in BMP C241, Temporary Sediment Pond) can be used. If a
permanent control structure is used, it may be advisable to partially restrict
the lower orifice with gravel to increase residence time while still allowing
dewatering of the pond. A shut-off valve may be added to the control
structure to allow complete retention of stormwater in emergency
situations. In this case, an emergency overflow weir must be added.
A skimmer may be used for the sediment trap outlet if approved by the
Local Permitting Authority.
Design and • See Figures 4.22 and 4.23 for details.
Installation
Specifications• If permanent runoff control facilities are part of the project, they
should be used for sediment retention.
• To determine the sediment trap geometry, first calculate the design
surface area (SA) of the trap, measured at the invert of the weir. Use
the following equation:
SA = FS(Q2/Vs)
where
Q2 = Design inflow based on the peak discharge from the
developed 2 -year runoff event from the contributing
drainage area as computed in the hydrologic analysis. The
10 -year peak flow shall be used if the project size, expected
timing and duration of construction, or downstream
conditions warrant a higher level of protection. If no
hydrologic analysis is required, the Rational Method may
be used.
Vs = The settling velocity of the soil particle of interest. The
0.02 mm (medium silt) particle with an assumed density of
2.65 g/cm3 has been selected as the particle of interest and
has a settling velocity (VS.) of 0.00096 ft/sec.
FS = A safety factor of 2 to account for non -ideal settling.
Therefore, the equation for computing surface area becomes:
SA = 2 x Q2/0.00096 or
2080 square feet per cfs of inflow
Note: Even if permanent facilities are used, they must still have a
surface area that is at least as large as that derived from the above
formula. If they do not, the pond must be enlarged.
• To aid in determining sediment depth, all sediment traps shall have a
staff gauge with a prominent mark 1 -foot above the bottom of the trap.
February 2005
Volume 11— Construction Stormwater Pollution Prevention 4-103
Water Quality Monitoring
Was any water quality monitoring conducted? o Yes o No
If water quality monitoring was conducted, record results here:
If water quality monitoring indicated turbidity 250 NTU or greater; or transparency 6
cm or less, was Ecology notified by phone within 24 hrs?
o Yes o No
_
If Ecology was notified, indicate the date, time, contact name and phone number below:
Date:
Time:
Contact Name:
Phone #:
General Comments and Notes
Include BMP repairs, maintenance, or installations made as a result of the inspection.
Were Photos Taken? o Yes o No
If photos taken, describe photos below:
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 37
September 7, 2010
Construction Stormwater
SITE INSPECTION CHECKLIST
Project Permit No. rnspecfr- - Date
Time
Will existing BMPs need to be modified or removed, or other BMPs installed? YES NO
IF YES, list the action items to be completed on the following table:
Actions to be Completed
Date
Completed/
Initials
1.
tube,
; laboratory
2.
NTU (cm, if tube
used)
3.
:; paper, kit, meter
4.
5.
6.
Describe
current
weather
Approximate amount of precipitation since last inspection: inches
and precipitation in the past 24 hours*: inches
*based on an on-site rain gauge or local weather data.
conditions
Describe discharging stormwater, if present. Note the presence of suspended sediment, "cloudiness",
discoloration, or oil sheen.
Was water quality sampling part of this inspection? YES NO
If yes, record results below (attach separate sheet, if necessary):
Parameter: . ' Method (circle one) ' Result
Units
Turbidity:;
tube,
; laboratory
meter,
NTU (cm, if tube
used)
pH ::
:; paper, kit, meter
pH standard units
Is the site in compliance with the SWPPP and the permit requirements? YES NO
If no, indicate tasks necessary to bring site into compliance on the "Actions to be Completed" table
above, and include dates each job WILL BE COMPLETED.
If no, has the non-compliance been reported to Dept. of Ecology? YES NO
If no, should the SWPPP be modified: YES NO
Sign the following certification:
"I certify that this report is true, accurate, and complete, to the best of my knowledge and belief."
Inspection completed on: by: (print+signature)
Title/Qualification of Inspector:
Stone Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 36
September 7, 2010
Project Permit No.
Construction Stormwater
SITE INSPECTION CHECKLIST
Inspector Date
Time
Protect Slopes
•Temporary and Permanent Seeding
• Interceptor Swale
• Check Dams
• Materials on Hand
•
0 0 0 0 0
m m m m
Y
Y
Y
Y
Y
N
N
N
N
N
Protect Drain Inlets
• Catch Basin Filters
•
GF
GFP
P
Y
Y
N
N
Stabilize Channels and Outlets
•Conveyance channels
•Energy dissipators
•
GFP
GFP
GFP
Y
Y
Y
N
N
N
Control Pollutants
•Chemical Storage Area Covered
• Concrete Handling
•
GFP
GFP
GFP
Y
Y
Y
N
N
N
Control De -watering
•
GFP
Y
N
G=Good F=Fair P=Poor Y=Yes N=No
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 35
September 7, 2010
Construction Stormwater
SITE INSPECTION CHECKLIST
Project Piet rtitNo. Inspector Date
Site BMPs
Overall Need
Condition Repair?
Time
Comments/Observations
Clearing Limits
• Preserving Natural Vegetation
• High Visibility Plastic or Metal Fence
• Silt Fence
•
GFP
G
GFP
GFP
F
P
Y
Y
Y
Y
N
N
N
N
Construction Access/Roads
• Stabilized Construction Entrance
• Wheel Wash (If necessary)
•
GFP
GFP
GFP
Y
Y
Y
N
N
N
Control Flow Rates
• Sediment Trap
• Detention Pond
•
GFP
GFP
GFP
Y
Y
Y
N
N
N
Install Sediment Controls
*Silt Fence
• Sediment Trap
• Storm Drain Inlet Protection
• Materials on Hand
• Detention Pond or Vault
•
00000G)
m T 71 71 m m
Y
Y
Y
Y
Y
Y
N
N
N
N
N
N
Preserve Vegetation/Stabilize Soils
•Temporary and Permanent Seeding
• Plastic Covering
• Dust Control
• Mulching
• Materials on Hand
•
GF
GFP
GFP
GFP
GFP
GFP
P
Y
Y
Y
Y
Y
Y
N
N
N
N
N
N
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 34
September 7, 2010
h. A statement that, in the judgmenrcif-the-person conducting the site
inspection, the site is either in compliance or out of compliance
with the terms and conditions of the SWPPP and the NPDES
permit. If the site inspection indicates that the site is out of
compliance, the inspection report shall include a summary of the
remedial actions required to bring the site back into compliance, as
well as a schedule of implementation.
Name, title, and signature of person conducting the site inspection;
and the following statement: "I certify under penalty of law that
this report is true, accurate, and complete, to the best of my
knowledge and belief'.
When the site inspection indicates that the site is not in compliance with any terms and
conditions of the NPDES permit, the Permittee shall take immediate action(s) to: stop,
contain, and clean up the unauthorized discharges, or otherwise stop the noncompliance;
correct the problem(s); implement appropriate Best Management Practices (BMPs),
and/or conduct maintenance of existing BMPs; and achieve compliance with all
applicable standards and permit conditions. In addition, if the noncompliance causes a
threat to human health or the environment, the Permittee shall comply with the
Noncompliance Notification requirements in Special Condition S5.F of the permit.
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 33
September 7, 2010
Appendix E — Site Inspection Forms (and Site Log)
The results of each inspection shall be summarized in an inspection report or checklist
that is entered into or attached to the site log book. It is suggested that the inspection
report or checklist be included in this appendix to keep monitoring and inspection
information in one document, but this is optional. However, it is mandatory that this
SWPPP and the site inspection forms be kept onsite at all times during construction, and
that inspections be performed and documented as outlined below.
At a minimum, each inspection report or checklist shall include:
a. Inspection date/times
b. Weather information: general conditions during inspection,
approximate amount of precipitation since the last inspection,
and approximate amount of precipitation within the last 24 hours.
c. A summary or list of all BMPs that have been implemented,
including observations of all erosion/sediment control structures or
practices.
d. The following shall be noted:
i. locations of BMPs inspected,
ii. locations of BMPs that need maintenance,
iii. the reason maintenance is needed,
iv. locations of BMPs that failed to operate as designed or
intended, and
v. locations where additional or different BMPs are needed, and
the reason(s) why
e. A description of stormwater discharged from the site. The presence
of suspended sediment, turbid water, discoloration, and/or oil
sheen shall be noted, as applicable.
f. A description of any water quality monitoring performed during
inspection, and the results of that monitoring.
g. General comments and notes, including a brief description
of any BMP repairs, maintenance or installations made as a result.
of the inspection.
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 32
September 7, 2010
Page 46 of 46
APPENDIX B — ACRONYMS
AKART All Known, Available, and Reasonable Methods of Prevention, Control, and
Treatment
BMP Best Management Practice
CESCL Certified Erosion and Sediment Control Lead
CFR Code of Federal Regulations
CKD Cement Kiln Dust
cm Centimeters
CTB Cement Treated Base
CWA Clean Water Act
DMR Discharge Monitoring Report
EPA Environmental Protection Agency
ESC Erosion and Sediment Control
NOL Notice of Intent
NOT Notice of Termination
NPDES National Pollutant Discharge Elimination System
NTU Nephelometric Turbidity Unit
RCW Revised Code of Washington
SEPA State Environmental Policy Act
SWMM Stormwater Management Manual
SWPPP Stormwater Pollution Prevention Plan
TMDL Total Maximum Daily Load
UIC Underground Injection Control
USC United States Code
USEPA United States Environmental Protection Agency
WAC Washington Administrative Code
WO Water Quality
WWFIM Western Washington Hydrology Model
- Page 45 of 46
defined in Chapter 90.48 RCW which include lakes, rivers, ponds, streams, inland waters,
underground waters, salt waters, and all other surface waters and water courses within the
jurisdiction of the state of Washington.
Well means a bored, drilled or driven shaft, or dug hole whose depth is greater than the
largest surface dimension. (see Injection Well)
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Stormwater means that portion of precipitation that does not naturally percolate into the ground
or evaporate, but flows via overland flow, interflow, pipes, and other features of a stormwater
drainage system into a defined surface water body, or a constructed infiltration facility.
Stormwater Management Manual (SWMM) or Manual means the technical manual published by
Ecology for use by local governments that contain descriptions of and design criteria for BMPs
to prevent, control, or treat pollutants in stormwater.
Stormwater Pollution Prevention Plan (SWPPPZ means a documented plan to implement
measures to identify, prevent, and control the contamination of point source discharges of
Stormwater.
Surface Waters of the State includes lakes, rivers, ponds, streams, inland waters, salt waters, and
all other surface waters and water courses within the jurisdiction of the state of Washington.
Total Maximum Daily Load (TMDL) means a calculation of the maximum amount of a pollutant
that a waterbody can receive and still meet state water quality standards. Percentages of the total
maximum daily load are allocated to the various pollutant sources. A TMDL is the sum of the
allowable loads of a single pollutant from all contributing point and nonpoint sources. The
TMDL calculations shall include a "margin of safety" to ensure that the waterbody can be
protected in case there are unforeseen events or unknown sources of the pollutant. The
calculation shall also account for seasonable variation in water quality.
Treatment BMPs means BMPs that are intended to remove pollutants from stormwater. A few
examples of treatment BMPs are detention ponds, oil/water separators, biofiltration, and
constructed wetlands.
Transparency means a measurement of water clarity in centimeters (cm), using a 60 cm.
transparency tube. The transparency tube is used to estimate the relative clarity or transparency
of water by noting the depth at which a black and white Secchi disc becomes visible when water
is released from a value in the bottom of the tube. A transparency tube is sometimes referred to
as a "turbidity tube".
Turbidity The clarity of water expressed as nephelometric turbidity units (NTU) and measured
with a calibrated turbidimeter.
Waste Load Allocation. (WLA) means the portion of a receiving water's loading capacity that is
allocated to one of its existing or future point sources of pollution. WLAs constitute a type of
water quality based effluent limitation (40 CFR 130.2(h)).
Water Quality means the chemical, physical, and biological characteristics of water, usually with
respect to its suitability for a particular purpose.
Waters of the State includes those waters as defined as "waters of the United States" in 40 CFR
Subpart 122.2 within the geographic boundaries of Washington State and "waters of the state" as
Page 43 of 46 --
Sanitary Sewer means a sewer which is designed to convey domestic wastewater.
Sediment means the fragmented material that originates from the weathering and erosion of rocks
or unconsolidated deposits, and is transported by, suspended in, or deposited by water.
Sedimentation means the depositing or formation of sediment.
Sensitive area means a waterbody, wetland, stream, aquifer recharge area, or channel migration
zone.
SEPA (State Environmental Policy Act) means the Washington State Law, RCW 43.21 C.020,
intended to prevent or eliminate damage to the environment.
SiRnifzcant Amount means an amount of a pollutant in a discharge that is amenable to available
and reasonable methods of prevention or treatment; or an amount of a pollutant that has a
reasonable potential to cause a violation of surface or ground water quality or sediment
management standards.
Significant Concrete Work means greater than 1000 cubic yards poured concrete or recycled
concrete.
Significant Contributor of Pollutants means a facility determined by Ecology to be a contributor
of a sign.ificarit amount(s) of a pollutant(s) to waters of the state of Washington.
Site means the land or water area where any "facility or activity" is physically located or
conducted.
Source Control BMPs means physical, structural or mechanical devices or facilities that are
intended to prevent pollutants from entering stormwater. A few examples of source control
BMPs are erosion control practices, maintenance of stormwater facilities, constructing roofs over
storage and working areas, and directing wash water and similar discharges to the sanitary sewer
or a dead end sump.
Sta.bilization means the application of appropriate BMPs to prevent the erosion of soils, such as,
temporary and permanent seeding, vegetative covers, mulching and matting, plastic covering and
sodding. See also the definition of Erosion and Sediment Control l3MPs.
Storni Drain means any drain which drains directly into a storm sewer system, usually found
along roadways or in parking lots.
Storni Sewer System means a means a conveyance, or system of conveyances (including roads
with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, manmade
channels, or storm drains designed or used for collecting or conveying stormwater. This does
not include systems which are part of a combined sewer or Publicly Owned Treatment Works
(POTW) as defined at 40 CFR 122.2.
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2. The party has day-to-day operational control of those activities at a project which are
necessary to ensure compliance with a SWPPP for the site or other permit conditions (e.g., they
are authorized to direct workers at a site to carry out activities required by the SWPPP or comply
with other permit conditions).
Outfall means the location where stormwater leaves the site. It also includes the location where
stormwater is discharged to a surface waterbody within a site, but does not include discharges to
on-site stormwater treatment/infiltration devices or storm sewer systems.
Permittee means individual or entity that receives notice of coverage under this general permit.
means a liquid's acidity or alkalinity. A pH of 7 is defined as neutral. Large variations above
or below this value are considered harmful to most aquatic life.
pH Monitoring Period means the time period in which the pH of stormwater runoff from a site
shall be tested a minimum of once every seven days to determine if stormwater is above pH 8.5.
Point Source means any discernible, confined, and discrete conveyance, including but not
limited to, any pipe, ditch, channel, tunnel, conduit, well, discrete fissure, and container from
which pollutants are or may be discharged to surface waters of the state. This term does not
include return flows from irrigated agriculture. (See Fact Sheet for further explanation.)
Pollutant means dredged spoil, solid waste, incinerator residue, filter backwash, sewage,
garbage, domestic•sewage sludge (biosolids), munitions, chemical wastes, biological materials,
radioactive materials, heat, wrecked or discarded equipment, rock, sand, cellar dirt, and
industrial, municipal, and agricultural waste. This term does not include sewage from vessels
within the meaning of section 312 of the CWA, nor does it include dredged or fill material
discharged in accordance with a permit issued under section 404 of the CWA.
Pollution means contamination or other alteration of the physical, chemical, or biological
properties of waters of the state; including change in temperature, taste, color, turbidity, or odor
of the waters; or such discharge of any liquid, gaseous, solid, radioactive or other substance into
any waters of the state as will or is likely to create a nuisance or render such waters harmful,
detrimental or injurious to the public health, safety or welfare; or to domestic, commercial,
industrial, agricultural, recreational, or other legitimate beneficial uses; or to livestock, wild
animals, birds, fish or other aquatic life.
Receiving Water means the waterbody at the point of discharge. If the discharge is to a storm
sewer system, either surface or subsurface, the receiving water is the waterbody that the storm
sewer system discharges to. Systems designed primarily for other purposes such as for ground
water drainage, redirecting stream natural flows, or for conveyance of irrigation water/return
flows that coincidentally convey stormwater are considered the receiving water.
Representative means a stormwater or wastewater sample which represents the flow and
characteristics of the discharge. Representative samples may be a grab sample, a time -
proportionate composite sample, or a flow proportionate sample. Ecology's Construction
Stormwater Monitoring Manual provides guidance on representative sampling.
Page 41 of 46
Engineered soils The use of soil amendments including, but not limited, to Portland cement
treated base (CTB), cement kiln dust (CKD), or fly ash to achieve certain desirable soil
characteristics.
Equivalent BMPs means operational, source control, treatment, or innovative BMPs which result •
in equal or better quality of stormwater discharge to surface water or to ground water than BMPs
selected from the SWMM.
Erosion means the wearing away of the land surface by running water, wind, ice, or other
geological agents, including such processes as gravitational creep.
Erosion and Sediment Control BMPs means BMPs that are intended to prevent erosion and
sedimentation, such as preserving natural vegetation, seeding, mulching and matting, plastic
covering, filter fences, sediment traps, and ponds. Erosion and sediment control BMPs are
synonymous with stabilization and structural BMPs.
Final Stabilization (same as fully stabilized or full stabilization) means the establishment of a
permanent vegetative cover, or equivalent permanent stabilization measures (such as riprap,
gabions or geotextiles) which prevents erosion.
Ground Water means water in a saturated zone or stratum beneath the land surface or a surface
water booty.
Injection well means a "well" that is used for the subsurface emplacement of fluids. (see Well)
Jurisdiction means a political unit such as a city, town or county; incorporated for local self-
government.
National Pollutant Discharge Elimination System (NPDES) means the national program for
issuing, modifying, revoking and reissuing, terminating, monitoring, and enforcing permits, and
imposing and enforcing pretreatment requirements, under sections 307, 402, 318, and 405 of the
Federal Clean Water Act, for the discharge of pollutants to surface waters of the state from point
sources. These permits are referred to as NPDES permits and, in Washington State, are
administered by the Washington Department of Ecology.
Notice of Intent (NO1) means the application for, or a request for coverage under this general
permit pursuant to WAC 1.73-226-200.
Notice of Termination (NOT) means a request for termination of coverage under this general
permit as specified by Special Condition S10 of this permit.
Operator means any party associated with a construction project that meets either of the
following two criteria:
1. The party has operational control over construction plans and specifications, including the
ability to make modifications to inose plans and specifications; or
Page 40 of 46
If the project is part of a common plan of development or sale, the disturbed area of the entire
plan shall be used in determining permit requirements.
Composite Sample A mixture of grab samples collected at the same sampling point at different
times, formed either by continuous sampling or by mixing discrete samples. May be "time -
composite" (collected at constant time intervals) or "flow -proportional" (collected either as a
constant sample volume at time intervals proportional to stream flow, or collected by increasing
the volume of each aliquot as the flow increases while maintaining a constant time interval
between the aliquots.
Construction Activity means land disturbing operations including clearing, grading or excavation
which disturbs the surface of the land. Such activities may include road construction,
construction of residential houses, office buildings, or industrial buildings, and demolition
activity.
Demonstrably Equivalent means that the technical basis for the selection of all stormwater BMPs
is documented within a SWPPP, including:
1. The method and reasons for choosing the stormwater BMPs selected;
2. The pollutant removal performance expected from the BMPs selected;
3. The technical basis supporting the performance claims for the BMPs selected,
. including any available data concerning field performance of the BMPs selected;
4. An assessment of how the selected BMPs will comply with state water quality
standards; and
5. An assessment of how the selected BMPs will satisfy both applicable federal
technology-based treatment requirements and state requirements to use all known,
available, and reasonable methods of prevention, control, and treatment (AKART).
Department means the Washington State Department of Ecology.
Detention means the temporary storage of stormwater to improve quality and/or to reduce the
mass flow rate of discharge.
De -watering means the act of pumping ground water or stormwater away from an active
construction site.
Director means the Director of the Washington Department of Ecology or his/her authorized
representative.
Discharger means an owner or operator of any facility or activity subject to regulation under
Chapter 90.48 RCW or the Federal Clean Water Act.
Domestic Wastewater means water carrying human wastes, including kitchen, bath, and laundry
wastes from residences, buildings, industrial establishments, or other places, together with such
ground water infiltration or surface waters as may be present.
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APPENDIX A — DEFINITIONS
AKART is an acronym for "all known, available, and reasonable methods of prevention, control,
and treatment." AKART represents the most current methodology that can be reasonably
required for preventing, controlling, or abating the pollutants and controlling pollution associated
with a discharge.
Applicable TMDL means a TMDL for turbidity, fine sediment, high pH, or phosphorus, which
has been completed and approved by EPA prior to November 16, 2005, or prior to the date the
operator's complete permit application is received by Ecology, whichever is later.
Applicant means an opel razor seeking coverage under this permit.
Best Management Practices (BMPs) means schedules of activities, prohibitions of practices,
maintenance procedures, and other physical, structural and/or managerial practices to prevent or
reduce the pollution of waters of the state. I3MPs include treatment systems, operating
procedures, and practices to control: stormwater associated with construction activity, spillage
or leaks, sludge or waste disposal, or drainage from raw material storage.
Buffer means an area designated by a local jurisdiction that is contiguous to and intended to
protect a sensitive area
Bypass means the intentional diversion of waste streams from any portion of a treatment facility.
Calendar Week (same as Week) means a period of seven consecutive days starting on Sunday.
Certified Erosion and Sediment Control Lead (CESCL) means a person who has current:
certification through an approved erosion and sediment control training program that meets the
minimum training standards established by Ecology (see BMP C160 in the SWMM).
Clean Water Act (CWA) means the Federal Water Pollution Control Act enacted by Public Law
92-500, as amended by Public Laws 95-217, 95-576, 96-483, and 97-117; USC 1251 et seq.
Combined Sewer means a sewer which has been designed to serve as a sanitary sewer and a
storm sewer, and into which inflow is allowed by local ordinance.
Common plan of development or sale means a site where multiple separate and distinct
construction activities may be taking place al different times on different schedules, but still
under a single plan. Examples include: 1) phased projects and projects with multiple filings or
lots, even if the separate phases or filings/lots will be constructed under separate contract or by
separate owners (e.g., a development where lots are sold to separate builders); 2) a development
plan that may be phased over multiple years, but is still under a consistent plan for long-term
development; and 3) projects in a contiguous area that may be unrelated but still under the sante
contract, such as construction of a building extension and a new parking lot at the same facility.
Page 38 of 46
f.
g•
h.
the projected date of bypass initiation;
a statement of compliance with SEPA;
a request for modification of water quality standards as provided for in WAC 173-
201E-110, if an exceedance of any water quality standard is anticipated; and
i. steps taken or planned to reduce, eliminate, and prevent reoccurrence of the
bypass.
5. For probable construction bypasses, the need to bypass is to be identified as early in
the planning process as possible. The analysis required above shall be considered
during preparation of the Stormwater Pollution Prevention Plan (SWPPP) and shall
be included to the extent practical. In cases where the probable need to bypass is
determined early, continued analysis is necessary up to and including the construction
period in an effort to minimize or eliminate the bypass.
Ecology will consider the following prior to issuing an administrative order for this
type bypass:
a. If the bypass is necessary to perform construction or maintenance -related
activities essential to meet the requirements of this permit.
b. If there are feasible alternatives to bypass, such as the use of auxiliary treatment
facilities, retention of untreated wastes, stopping production, maintenance during
normal periods of equipment down time, or transport of untreated wastes to
another treatment facility.
c. If the bypass is planned and scheduled to minimize adverse effects on the public
and the environment.
After consideration of the above and the adverse effects of the proposed bypass and
any other relevant factors, Ecology will approve, conditionally approve, or deny the
request. The public shall be notified and given an opportunity to comment on bypass
incidents of significant duration, to the extent feasible. Approval of a request to
bypass will be by administrative order issued by Ecology under RCW 90.48.120.
B. Duty to Mitigate
The Permittee is required to take all reasonable steps to minimize or prevent any
discharge or sludge use or disposal in violation of this permit that has a reasonable
likelihood of adversely affecting human health or the environment.
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stormwater management. Ecology may take enforcement action against a Permittee for
bypass unless one of the following circumstances (1, 2, 3 or 4) is applicable.
1. Bypass of stormwater is consistent with the design criteria and part of an approved
management practice in the applicable stormwater management manual.
2. Bypass for essential maintenance without the potential to cause violation of permit
Limits or conditions.
Bypass is authorized if it is for essential maintenance and does not have the potential
to cause violations of limitations or other conditions of this permit, or adversely
impact public health.
3. Bypass of stormwater is unavoidable, unanticipated, and results in noncompliance of
this permit.
This bypass is permitted only if:
a. Bypass is unavoidable to prevent loss of life, personal injury, or severe property
damage. "Severe property damage" means substantial physical damage to
property, damage to the treatment facilities which would cause them to become
inoperable, or substantial and permanent loss of natural resources which can
reasonably be expected to occur in the absence of a bypass;
b. There are no feasible alternatives to the bypass, such as the use of auxiliary
treatment facilities, retention of untreated wastes, maintenance during normal
periods of equipment downtime (but not if adequate backup equipment should
have been installed in the exercise of reasonable engineering judgment to prevent
a,bypass which occurred during normal periods of equipment downtime or
preventative maintenance), or transport of untreated wastes to another treatment
facility; and
c. Ecology is properly notified of the bypass as required in Special Condition S5.F
of this permit.
4. A planner( action that would cause bypass of stormwater and has the potential to
result in noncompliance of this permit during a storm event.
The Permittee shall notify Ecology at least thirty (30) days before the planned date of
bypass. The notice shall contain:
a. a description of the bypass and its cause;
b. an analysis of all known alternatives which would eliminate, reduce, or mitigate
the need for bypassing;
c. a cost-effectiveness analysis of alternatives including comparative resource
damage assessment;
d. the minimum and maximum duration of bypass under each alternative;
e. a recommendation as to the preferred alternative for conducting the bypass;
Page 36 of 46
unavoidable interruption of operation and degradation of effluent quality, shall be scheduled
during non-critical water quality periods and carried out in a manner approved by Ecology.
G23. REQUESTS TO BE EXCLUDED FROM COVERAGE UNDER THE PERMIT
Any discharger authorized by this permit may request to be excluded from coverage under
the general permit by applying for an individual permit. The discharger shall submit to the
Director an application as described in WAC 173-220-040 or WAC 173-216-070, whichever
is applicable, with reasons supporting the request. These reasons shall fully document how an
individual permit will apply to the applicant in a way that the general permit cannot. Ecology
may make specific requests for information to support the request. The Director shall either
issue an individual permit or deny the request with a statement explaining the reason for the
denial. When an individual permit is issued to a discharger otherwise subject to the
construction stormwater general permit, the applicability of the construction stormwater
general permit to that Permittee is automatically terminated on the effective date of the
individual permit.
G24. APPEALS
A. The terms and conditions of this general permit, as they apply to the appropriate class of
dischargers, are subject to appeal by any person within 30 days of issuance of this general
permit, in accordance with Chapter 43.21B RCW, and Chapter 173-226 WAC.
B. The terms and conditions of this general permit, as they apply to an individual discharger,
are appealable in accordance with Chapter 43.21B RCW within 30 days of the effective
date of coverage of that discharger. Consideration of an appeal of general permit
coverage of an individual discharger is limited to the general permit's applicability or
nonapplicability to that individual discharger.
C. The appeal of general permit coverage of an individual discharger does not affect any
other dischargers covered under this general permit. If the terms and conditions of this
general permit are found to be inapplicable to any individual discharger(s), the matter
shall be remanded to Ecology for consideration of issuance of an individual permit or
permits.
G25. SEVERABILITY
The provisions of this permit are severable, and if any provision of this permit, or application
of any provision of this permit to any circumstance, is held invalid, the application of such
provision to other circumstances, and the remainder of this permit shall not be affected
thereby.
G26. BYPASS PROI•HIBITED
A. Bypass Procedures
Bypass, which is the intentional diversion of waste streams from any portion of a
treatment facility, is prohibited for stormwater events below the design criteria for
G19. PENALTIES FOR TAMPERING
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The Clean Water Act provides that any person who falsifies, tampers with, or knowingly
renders inaccurate any monitoring device or method required to be maintained under this
permit shall, upon conviction, be punished by a fine of not more than $10,000 per violation,
or by imprisonment for not more than two years per violation, or by both. If a conviction of
a person is for a violation committed after a first conviction of such person under this
Condition, punishment shall be a fine of not more than $20,000 per day of violation, or
imprisonment of not more than four (4) years, or both.
G20. REPORTING PLANNED CHANGES
The Permittee shall, as soon as possible, give notice to Ecology of planned physical
alterations, modifications or additions to the permitted construction activity, which will result
in:
A. The permitted facility being determined to be a new source pursuant to 40 CFR
122.29(b);
13. A significant change in the nature or an increase in quantity of pollutants discharged,
including but not limited to: for sites 5 acres or larger, a 20% or greater increase in
acreage disturbed by construction activity;
C. A change in or addition of surface water(s) receiving stormwater or non-stormwater from
the construction activity; or
D. A change in the construction plans and/or activity that affects the Permittee's monitoring
requirements in Special Condition S4.
Following such notice, permit coverage may be modified, or revoked and reissued pursuant
to 40 CFR 122.62(a) to specify and limit any pollutants not previously limited. Until such
modification is effective, any new or increased discharge in excess of permit limits or not
specifically authorized by this permit constitutes a violation.
G21. REPORTING OTHER INFORMATION
Where the Permittee becomes aware that it failed to submit any relevant facts in a permit
application, or submitted incorrect information in a permit application or in any report to
Ecology, it shall promptly submit such facts or information.
G22. REPORTING ANTICIPATED NON-COMPLIANCE
The Permittee shall give advance notice to Ecology by submission of a new application or
supplement thereto at least forty-five (45) days prior to commencement of such discharges,
of any facility expansions, production increases, or other planned changes, such as process
modifications, in the permitted facility or activity which may result in noncompliance with
permit limits or conditions. Any maintenance of facilities, which might necessitate
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thousand dollars ($10,000) for every such violation. Each and every such violation shall be a
separate and distinct offense, and in case of a continuing violation, every day's continuance
shall be deemed to be a separate and distinct violation.
G15. UPSET
Definition — "Upset" means an exceptional incident in which there is unintentional and
temporary noncompliance with technology-based permit effluent limitations because of
factors beyond the reasonable control of the Permittee. An upset does not include
noncompliance to the extent caused by operational error, improperly designed treatment
facilities, inadequate treatment facilities, lack of preventive maintenance, or careless or
improper operation.
An upset constitutes an affirmative defense to an action brought for noncompliance with such
technology-based permit effluent limitations if the requirements of the following paragraph
are met.
A Permittee who wishes to establish the affirmative defense of upset shall demonstrate,
through properly signed, contemporaneous operating logs or other relevant evidence that: 1)
an upset occurred and that the Permittee can identify the cause(s) of the upset; 2) the
permitted facility was being properly operated at the time of the upset; 3) the Permittee
submitted notice of the upset as required in condition S5.F; and 4) the Permittee complied
with any remedial measures required under this permit.
In any enforcement proceeding, the Permittee seeking to establish the occurrence of an upset
has the burden of proof.
G16. PROPERTY RIGHTS
This permit does not convey any property rights of any sort, or any exclusive privilege.
G17. DUTY TO COMPLY
The Permittee shall comply with all conditions of this permit. Any permit noncompliance
constitutes a violation of the Clean Water Act and is grounds for enforcement action; for
permit termination, revocation and reissuance, or modification; or denial of a permit renewal
application.
G18. TOXIC POLLUTANTS
The Permittee shall. comply with effluent standards or prohibitions established under Section
307(a) of the Clean Water Act for toxic pollutants within the time provided in the regulations
that establish those standards or prohibitions, even if this permit has not yet been modified to
incorporate the requirement.
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A. A written, signed agreement (Transfer of Coverage Form) between the current discharger
(Permittee) and new discharger containing a specific date for transfer of permit
responsibility, coverage, and liability is submitted to the Director; and
B. The Director does not notify the current discharger and new discharger of the Director's
intent to revoke coverage under the general permit. If this notice is not given, the transfer
is effective on the date specified in the written agreement.
When a current discharger (Permittee) transfers a portion of a permitted site, the current
discharger shall also submit an updated application form (NOI) to the Director indicating the
remaining permitted acreage after the transfer. When a current discharger (Permittee)
transfers all portions of a permitted site to one or more new dischargers, the current
discharger shall also submit a notice of termination (NOT) form to the Director.
G1.0. REMOVED SUBSTANCES
Collected screenings, grit, solids, sludges, filter backwash, or other pollutants removed in the
course of treatment or control of stormwater shall not be resuspended or reintroduced to the
final effluent stream for discharge to state waters.
G11. DUTY TO PROVIDE INFORMATION
The Permittee shall submit to Ecology, within a reasonable time, all information which
Ecology may request to determine whether cause exists for modifying, revoking and
reissuing, or terminating this permit or to determine compliance with this permit. The
Permittee shall also submit to Ecology upon request, copies of records required to be kept by
this permit [40 CFR 122.41(h)].
G12. OTHER REQUIREMENTS OF 40 CFR
All other requirements of 40 CFR 122.41 and 122.42 are incorporated in this permit by
reference.
G13. ADDITIONAL MONITORING
Ecology may establish specific monitoring requirements in addition to those contained in this
permit by administrative order or permit modification.
G14. PENALTIES FOR VIOLATING PERMIT CONDITIONS
Any person who is found guilty of willfully violating the terms and conditions of this permit
shall be deemed guilty of a crime, and upon conviction thereof shall be punished by a fine of
up t0 ten thousand dollars ($10,000) and costs of prosecution, or by imprisonment in the
discretion of the court. Each day upon which a willful violation occurs may be deemed a
separate and additional violation.
Any person who violates the terms and conditions of a waste discharge permit shall incur, in
addition to any other penalty as provided by law, a civil penalty in the amount of up to ten
Page 32 of 46
A. Violation of any term or condition of this permit;
B. Obtaining coverage under this permit by misrepresentation or failure to disclose fully all
relevant facts;
C. A change in any condition that requires either a temporary or permanent reduction or
elimination of the permitted discharge;
D. Failure or refusal of the Permittee to allow entry as required in RCW 90.48.090;
E. A determination that the permitted activity endangers human health or the environment,
or contributes to water quality standards violations;
F. Nonpayment of permit fees or penalties assessed pursuant to RCW 90.48.465 and
Chapter 173-224 WAC;
G. Failure of the Permittee to satisfy the public notice requirements of WAC 173-226-
130(5), when applicable.
The Director may require any discharger under this permit to apply for and obtain coverage
under an individual permit or another more specific general permit. Permittees who have
their coverage revoked for cause according to WAC 173-226-240 may request temporary
coverage under this permit during the time an individual permit is being developed, provided
the request is made within ninety (90) days from the time of revocation and is submitted
along with a complete individual permit application form.
G6. REPORTING A CAUSE FOR MODIFICATION
The Permittee shall submit a new application, or a supplement to the previous application,
whenever a material change to the construction activity or in the quantity or type of discharge
is anticipated which is not specifically authorized by this permit. This application shall be
submitted at least sixty (60) days prior to any proposed changes. The filing of a request by
the Permittee for a permit modification, revocation and reissuance, or termination, or a
notification of planned changes or anticipated noncompliance does not relieve the Permittee
of the duty to comply with the existing permit.until it is modified or reissued.
G7. COMPLIANCE WITH OTHER LAWS AND STATUTES
Nothing in this permit shall be construed as excusing the Permittee from compliance with
any applicable federal, state, or local statutes, ordinances, or regulations.
G8. DUTY TO REAPPLY
The Permittee shall apply for permit renewal at least 180 days prior to the specified
expiration date of this permit.
G9. TRANSFER OF GENERAL PERMIT COVERAGE
Coverage under this general permit is automatically transferred to a new discharger,
including operators of lots/parcels within a common plan of development or sale, if:
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the information submitted. Based on my inquiry of the person or persons who
manage the system, or those persons directly responsible for gathering
information, the information submitted is, to the best of my knowledge and
belief, true, accurate, and complete. I am aware that there are significant
penalties for submitting false information, including the possibility of fine and
imprisonment for knowing violations."
G3. RIGHT OF INSPECTION AND ENTRY
The Permittee shall allow an authorized representative of Ecology, upon the presentation of
credentials and such other documents as may be required by law:
A. To enter upon the premises where a discharge is located or where any records shall be
kept under the terns and conditions of this permit.
B. To have access to and copy - at reasonable times and at reasonable cost - any records
required to be kept under the terms and conditions of this permit.
C. To inspect - at reasonable times - any facilities, equipment (including monitoring and
control equipment), practices, methods, or operations regulated or required under this
permit.
D. To sample or monitor - at reasonable times - any substances or parameters at any location
for purposes of assuring permit compliance or as otherwise authorized by the Clean
Water Act.
G4. GENERAL PERMIT MODIFICATION AND REVOCATION
This permit may be modified, revoked and reissued, or terminated in accordance with the
provisions of Chapter 173-226 WAC. Grounds for modification, revocation and reissuance,
or termination include, but are not Limited to, the following:
A. When a change which occurs in the technology or practices for control or abatement of
pollutants applicable to the category of dischargers covered under this permit;
B. When effluent limitation guidelines or standards are promulgated pursuant to the CWA or
Chapter 90.48 RCW, for the category of dischargers covered under this permit;
C. When a water quality management plan containing requirements applicable to the
category of dischargers covered under this permit is approved; or
D. When information is obtained which indicates that cumulative effects on the environment
from dischargers covered under this permit arc unacceptable.
G5. REVOCATION OF COVERAGE UNDER THE PERMIT
Pursuant with Chapter 43.21.I3 RCW and Chapter 173-226 WAC, the Director may terminate
coverage for any discharger under this permit for cause. Cases where coverage may be
terminated include, but are not limited to, the following:
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GENERAL CONDITIONS
Gl. DISCHARGE VIOLATIONS
All discharges and activities authorized by this general permit shall be consistent with the
terms and conditions of this general permit. Any discharge of any pollutant more frequent
than or at a level in excess of that identified and authorized by the general permit shall
constitute a violation of the terms and conditions of this permit.
G2. SIGNATORY REQUIREMENTS
A. All permit applications shall bear a certification of correctness to be signed:
1. In the case of corporations, by a responsible corporate officer of at least the level of
vice president of a corporation;
2. In the case of a partnership, by a general partner of a partnership;
3. In the case of sole proprietorship, by the proprietor; or
4. In the case of a municipal, state, or other public facility, by either a principal
executive officer or ranking elected official.
13. All reports required by this permit and other information requested by Ecology shall be
signed by a person described above or by a duly authorized representative of that person.
A person is a duly authorized representative only if:
1. The authorization is made in writing by a person described above and submitted to
the Ecology.
2. The authorization specifies either an individual or a position having responsibility for
the overall operation of the regulated facility, such as the position of plant manager,
superintendent, position of equivalent responsibility, or an individual or position
having overall responsibility for environmental matters.
C. Changes to authorization. If an authorization under paragraph 02.13.2 above is no longer
accurate because a different individual or position has responsibility for the overall
operation of the facility, a new authorization satisfying the requirements of paragraph
G2.B.2 above shall be submitted to Ecology prior to or together with any reports,
information, or applications to be signed by an authorized representative.
D. Certification. Any person signing a document under this section shall make the following
certification:
"I certify under penalty of law, that this document and all attachments were
prepared under nay direction or supervision in accordance with a system
designed to assure that qualified personnel properly gathered and evaluated
Page 29 of 46
10. Areas where final stabilization has been accomplished and no further construction -
phase permit requirements apply.
S10. NOTICE OF TERMINATION
A. The site is eligible for termination when either of the following conditions have been met:
1. The site has undergone final stabilization, all temporary BMPs have been removed,
and all stormwater discharges associated with construction activity have been
eliminated; or
2. All portions of the site which have not undergone final stabilization per S10.A.1 have
been sold and/or transferred (per Condition G9), and the Permittee no longer has
operational control of the construction activity.
B. When the site is eligible for termination, the Permittee shall submit a complete and
accurate Notice of Termination (NOT) form, signed in accordance with General
Condition G2, to:
Department of Ecology
Water Quality Program - Construction Stormwater
PO Box 47696
Olympia, Washington 98504-7696
C. The termination is effective 011 the date the NOT form was received by Ecology, unless
the Permittee is notified by Ecology within 30 days that termination request is denied
because the eligibility requirements in Condition S1.0.A have not been met.
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12. Manage the Project
a. Development projects shall be phased to the maximum degree practicable and shall
take into account seasonal work limitations.
b. Inspection and Monitoring
All BMPs shall be inspected, maintained, and repaired as needed to assure
continued performance of their intended function. Site inspections and monitoring
shall be conducted in accordance with S4.
c. Maintaining an Updated Construction SWPPP
The SWPPP shall be maintained, updated, and implemented in accordance with
Conditions S3, S4 and S9.
E. SWPPP — Map Contents and Requirements
The SWPPP shall also include a vicinity map or general location map (e.g. USGS
Quadrangle map, a portion of a county or city map, or other appropriate map) with
enough detail to identify the location of the construction site and receiving waters within
one mile of the site.
The SWPPP shall also include a legible site map (or maps) showing the entire
construction site. The following features shall be identified, unless not applicable due to
site conditions:
1. The direction of north, property lines, and existing structures and roads;
2. Cut and fill slopes indicating the top and bottom of slope catch lines;
3. Approximate slopes, contours, and direction of stormwater flow before and after
major grading activities;
4. Areas of soil disturbance and areas that will not be disturbed;
5. Locations of structural and nonstructural controls (BMPs) identified in the SWPPP
6. Locations of off-site material, stockpiles, waste storage, borrow areas, and
vehicle/equipment storage areas;
7. Locations of all surface water bodies, including wetlands;
8. Locations where stormwater or non-stormwater discharges off-site and/or to a surface
water body, including wetlands;
9. Location of water quality sampling station(s), if sampling is required by state or local
permitting authority; and
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f. BMPs shall be used to prevent or treat contamination of stormwater runoff by pH
modifying sources. These sources include, but are not limited to: bulk cement,
cement kiln dust, fly ash, new concrete washing and curing waters, waste streatns
generated from concrete grinding and sawing, exposed aggregate processes,
dewatering concrete vaults, concrete pumping and mixer washout waters.
Permittees shall adjust the pH of stormwater if necessary to prevent violations of
water quality standards.
Permittees shall obtain written approval from Ecology prior to using chemical
treatment, other than CO2 or dry ice to adjust pH.
10. Control De -Watering
g.
a. Foundation, vault, and trench de -watering water, which have similar characteristics
to stormwater runoff at the site, shall be discharged into a controlled conveyance
system prior to discharge to a sediment trap or sediment pond.
b. Clean, non -turbid de -watering water, such as well -point ground water, can be
discharged to systems tributary to, or directly into surface waters of the state, as
specified in S9.D.8, provided the de -watering flow does not cause erosion or
flooding of receiving waters. Clean de -watering water should not be routed through
stormwater sediment ponds.
c. Other de -watering disposal ,options may include:
i. infiltration
ii. transport offsite in a vehicle, such as a vacuum flush truck, for legal disposal in
a manner that does not pollute state waters,
Ecology -approved on-site chemical treatment or other suitable treatment
technologies,
iv. sanitary sewer discharge with local sewer district approval, if there is no other
option, or
v. use of a sedimentation bag with orstfall to a ditch or swale for small volumes of
localized de -watering.
d. Highly turbid or contaminated dewatering water shall be handled separately from
stormwater.
H. Maintain BMPs
a. All temporary and permanent erosion and sediment control BMPs shall be
maintained and repaired as needed to assure continued performance of their
intended function in accordance with BMP specifications.
b. All temporary erosion and sediment control BMPs shall be removed within 30 days
after final site stabilization is achieved or after the temporary BMPs are no longer
needed.
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b. Inlet protection devices shall be cleaned or removed and replaced when sediment
has filled one-third of the available storage (unless a different standard is specified
by the product manufacturer).
8. Stabilize Channels and Outlets
a. All temporary on-site conveyance channels shall be designed, constructed, and
stabilized to prevent erosion from the following expected peak flows:
i. West of the Cascade Mountains Crest: Channels shall handle the peak 10
minute velocity of flow from a Type 1A, 10 -year, 24-hour frequency storm for
the developed condition. Alternatively, the 10 -year, 1 -hour flow rate indicated
by an approved continuous runoff model, increased by a factor of 1.6, may be
used. The hydrologic analysis shall use the existing land cover condition for
predicting flow rates from tributary areas outside the project limits. For
tributary areas on the project site, the analysis shall use the temporary or
permanent project land cover condition, whichever will produce the highest
flow rates. If using the WWHM to predict flows, bare soil areas should be
modeled as "landscaped area."
ii. East of the Cascade Mountains Crest: Channels shall handle the expected peak
flow velocity from a 6 -month, 3 -hour storm for the developed condition,
referred to as the short duration storm.
b. Stabilization, including armoring material, adequate to prevent erosion of outlets,
adjacent stream banks, slopes, and downstream reaches shall be provided at the
outlets of all conveyance systems.
9. Control Pollutants
a. All pollutants, including waste materials and demolition debris, that occur onsite
shall be handled and disposed of in a manner that does not cause contamination of
stormwater.
b. Cover, containment, and protection from vandalism shall be provided for all
chemicals, liquid products, petroleum products, and other materials that have the
potential to pose a threat to human health or the environment. On-site fueling tanks
shall include secondary containment.
c. Maintenance, fueling, and repair of heavy equipment and vehicles shall be
conducted using spill prevention and control measures. Contaminated surfaces shall
be cleaned immediately following any spill incident.
d. Wheel wash or tire bath wastewater shall be discharged to a separate on-site
treatment system or to the sanitary sewer with local sewer district approval.
e. Application of fertilizers and pesticides, shall be conducted in a manner and at
application rates that will not result in loss of chemical to stormwater runoff.
Manufacturers' label requirements for application rates and procedures shall be
followed.
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The time period may be adjusted by a local jurisdiction, if the jurisdiction
can show that local precipitation data justify a different standard.
c. Soils shall be stabilized at the end of the shift before a holiday or weekend if needed
based on the weather forecast.
d. Soil stockpiles shall be stabilized from erosion, protected with sediment trapping
measures, and where possible, be located away from storin drain inlets, waterways,
and drainage channels.
6. Protect Slopes
a. Design and construct cut and fill slopes in a manner that will minimize erosion.
Applicable practices include, but are not limited to, reducing continuous length of
slope with terracing and diversions, reducing slope steepness, and roughening slope
surfaces (e.g., track walking).
b. Off-site stormwater (run-on) or groundwater shall be diverted away from slopes and
disturbed areas with interceptor dikes, pipes, and/or swales. Off-site stormwater
should be managed separately from stormwater generated on the site.
c. At the top of slopes, collect drainage in pipe slope drains or protected channels to
prevent erosion.
i. West of the Cascade Mountains Crest: Temporary pipe slope drains shall
handle the peak 10 -minute velocity of flow from a Type 1A, 10 -year, 24-hour
frequency storm for the developed condition. Alternatively, the 10 -year, 1 -
hour flow rate predicted by an approved continuous runoff model, increased
by a factor of 1.6, may be used. The hydrologic analysis shall use the existing
land cover condition for predicting flow rates from tributary areas outside the
project limits. For tributary areas on the project site, the analysis shall use the
temporary or permanent project land cover condition, whichever will produce
the highest flow rates. If using the WWI-iM to predict flows, bare soil areas
should be modeled as "landscaped area."
ii. East of the Cascade Mountains Crest: Temporary pipe slope drains shall
handle the expected peak flow velocity from a 6 -month, 3 -hour storm for the
developed condition, referred to as the short duration storm.
d. Excavated material shall be placed on the uphill side of trenches, consistent with
safety and space considerations.
e. Check dams shall be placed at regular intervals within constructed channels that
are cut down a slope.
7. Protect Drain Inlets
a. All storm drain inlets made operable during construction shall be protected so that
stormwater runoff does not enter the conveyance system without first being filtered
or treated to remove sediment.
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b. Where necessary to comply with S9.D.3.a., stormwater retention or detention
facilities shall be constructed as one of the first steps in grading. Detention
facilities shall be functional prior to construction of site improvements (e.g.,
impervious surfaces).
c. If permanent infiltration ponds are used for flow control during construction, these
facilities shall be protected from siltation during the construction phase.
4. Install Sediment Controls
a. Stormwater runoff from disturbed areas shall pass through a sediment pond or other
appropriate sediment removal BMP, prior to leaving a construction site or prior to
discharge to an infiltration facility. Runoff from fully stabilized areas may be
discharged without a sediment removal BMP, but shall meet the flow control
performance standard of S9.D.3.a.
b. Sediment control BMPs (sediment ponds, traps, filters, etc.) shall be constructed as
one of the first steps in grading. These BMPs shall be functional before other land
disturbing activities take place.
c. BMPs intended to trap sediment on site shall be located in a manner to avoid
interference with the movement of juvenile salmonids attempting to enter off -
channel areas or drainages.
5. Stabilize Soils
a. Exposed and unworked soils shall be stabilized by application of effective BMPs
that prevent erosion. Applicable BMPs include, but are not limited to: temporary
and permanent seeding, sodding, mulching, plastic covering, erosion control fabrics
and matting, soil application of polyacrylamide (PAM), the early application of
gravel base on areas to be paved, and dust control.
b. Depending on the geographic location of the project, no soils shall remain exposed
and unworked for more than the time periods set forth below to prevent erosion:
West of the Cascade Mountains Crest
During the dry season (May 1 - Sept. 30): 7 days
During the wet season (October 1 - April 30): 2 days
East of the Cascade Mountains Crest, except for Central Basin`
During the dry season (July 1 - September 30): 10 days
During the wet season (October 1 - June 30): 5 days
The Central Basin", East of the Cascade Mountains Crest
During the dry Season (July 1 - September 30): 30 days
During the wet season (October 1 - June 30): 15 days
`Note: The Central Basin is defined as the portions of Eastern Washington
with mean annual precipitation of less than 12 inches.
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a. The technical basis for the selection of all stormwater BMPs (scientific, technical
studies, and/or modeling) which support the performance claims for the BMPs
being selected; and
b. An assessment of how the selected BMP will satisfy AKART requirements and
the applicable federal technology-based treatment requirements under 40 CFR
part 125.3.
D. SWPPP — Narrative Contents and Requirements
The Permittee shall include each of the 12 elements below in S9.D.1-12 in the narrative
of the SWPPP and ensure that they are implemented unless site conditions render the
element unnecessary and the exemption from that element is clearly justified in the
SWPPP.
1. Preserve Vegetation/Mark Clearing Limits
a. Prior to beginning land disturbing activities, including clearing and grading,
clearly mark all clearing limits, sensitive areas and their buffers, and trees that are
to be preserved within the construction area.
b. The duff layer, native top soil, and natural vegetation shall be retained in an
undisturbed state to the maximum degree practicable.
2. Establish Construction Access
a. Construction vehicle access and exit shall be limited to one route, if possible.
b. Access points shall be stabilized with a pad of quarry spalls, crushed rock, or other
equivalent BMP, to minimize the tracking of sediment onto public roads.
c. Wheel wash or tire baths shall be located on site, if the stabilized construction
entrance is not effective in preventing sediment from being tracked onto public
roads.
d. If sediment is tracked off site, public roads shall be cleaned thoroughly at the end of
each day, or more frequently during wet weather. Sediment shall be removed from
roads by shoveling or pickup sweeping and shall be transported to a controlled
sediment disposal area.
e. Street washing is allowed only after sediment is removed in accordance with
S9.D.2.d. Street wash wastewater shall be controlled by pumping back on site or
otherwise be prevented from discharging into systems tributary to waters of the
state.
3. Control Flow Rates
a. Properties and waterways downstream from development sites shall be protected
from erosion due to increases in the velocity and peak volumetric flow rate of
stormwater runoff from the project site, as required by local plan approval
authority.
Page22of46
b. Potential erosion problem areas;
c. The 12 elements of a SWPPP in S9.D.1-12, including BMPs used to address each
element;
d. Construction phasing/sequence and general BMP implementation schedule;
e. The actions to be taken if BMP performance goals are not achieved; and
f. Engineering calculations for ponds and any other designed structures.
2. The Permittee shall modify the SWPPP if, during inspections or investigations
conducted by the owner/operator, or the applicable local or state regulatory authority,
it is determined that the SWPPP is, or would be, ineffective in eliminating or
significantly minimizing pollutants in stormwater discharges from the site. The
Permittee shall take the following actions:
a. Review the SWPPP for compliance with Condition S9 and make appropriate
revisions within 7 days of the inspection or investigation;
b. Fully implement and maintain appropriate source control and/or treatment BMPs
as soon as possible, but no later than 10 days from the inspection or investigation;
and
c. Document BMP implementation and maintenance in the site log book.
3. The Permittee shall modify the SWPPP whenever there is a change in design,
construction, operation, or maintenance at the construction site that has, or could
have, a significant effect on the discharge of pollutants to waters of the state.
C. Stormwater Best Mana • ement Practices BMP
BMPs shall be consistent with:
1. Stormwater Management Manual for Western Washington (most recent edition), for
sites west of the crest of the Cascade Mountains;
2. Stormwater Management Manual for Eastern Washington (most recent edition), for
sites east of the crest of the Cascade Mountains; or •
3. Other stormwater management guidance documents or manuals which provide an
equivalent level of pollution prevention and are approved by Ecology; or
4. Documentation in the SWPPP that the BMPs selected provides an equivalent level of
pollution prevention, compared to the applicable Stormwater Management Manuals,
including:
Page 21 of 46
need not be accredited or registered unless conducted at a laboratory which must
otherwise be accredited or registered.
b. Where an applicable TMDL has established a general waste load allocation for
construction stormwater discharges, but no specific requirements have been
identified, compliance with Conditions S4 (Monitoring) and S9 (SWPPPs) will be
assumed to be consistent with the approved TMDL.
c. Where an applicable TMDL has not specified a waste load allocation for
construction stormwater discharges, but has not excluded these discharges,
compliance with Conditions S4 (Monitoring) and S9 (SWPPPs) will be assumed
to be consistent with the approved TMDL.
d. Where an applicable TMDL specifically precludes or prohibits discharges from
construction activity, the operator is not eligible for coverage under this permit.
2. Applicable TMDL means a TMDL for turbidity, fine sediment, high pH, or
phosphorus, which has been completed and approved by EPA prior to November 16,
2005, or prior to the date the operator's complete permit application is received by
Ecology, whichever is later. TMDLs completed after the operator's complete permit
application is received by Ecology become applicable to the Permittee only if they are
imposed through an administrative order by Ecology, or through a modification of
permit coverage.
S9. STORMWATER POLLUTION PREVENTION PLAN
An adequate Stormwater Pollution Prevention Plan (SWPPP) for construction activity shall
be prepared and implemented in accordance with the requirements of this permit beginning
with initial soil disturbance and until final stabilization.
A. The SWPPP shall meet the following objectives:
1. To implement Best Management Practices (BMPs) to prevent erosion and
sedimentation, and to identify, reduce, eliminate or prevent stormwater contamination
and water pollution from construction activity.
2. To prevent violations of surface water quality, ground water quality, or sediment
management standards.
3. To control peak volumetric flow rates and velocities of stormwater discharges.
B. General Requirements
1. The SWPPP shall include a narrative and drawings. All BMPs shall be clearly
referenced in the narrative and marked on the drawings.
The SWPPP narrative shall include documentation to explain and justify the pollution
prevention decisions made for the project. Documentation shall include:
a. Information about existing site conditions (topography, drainage, soils,
vegetation, etc.);
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b. Fully implement and maintain appropriate source control and/or treatment BMPs
as soon as possible, but within 10 days of the discharge that exceeded the
standards;
c. Document BMP implementation and maintenance in the site log book;
d. Notify the appropriate Ecology Regional Office by phone within 24 hours of
analysis; and
e. Continue to sample daily until discharge meets the water quality standard for pH
(in the range of 6.5 — 8.5) or the discharge stops or is eliminated.
Parameter identified
in 303(d) listing
Parameter/Units
Analytical
Method
Sampling
Frequency
Water Quality
Standard
Turbidity
Fine Sediment
Phosphorus
Turbidity/NTU
SM2130 or
EPA180.1
Weekly, if
discharging
If background is 50
NTU or less: 5 NTU
over background; or
If background is
more than 50 NTU:
10% over
background
High pH
pH/Standard
Units
pH meter
Weekly, if
discharging
In the range of
6.5 — 8.5
D. Sampling and Limitations For Sites Discharging to Applicable TMDLs
1. Discharges to a waterbodies subject to an applicable Total Maximum Daily Load
(TMDL) for turbidity, fine sediment, high pH, or phosphorus, shall be consistent with
the assumptions and requirements of the TMDL.
a. Where an applicable TMDI sets specific waste load allocations or requirements
for discharges covered by this permit, discharges shall be consistent with any
specific waste load allocations or requirements established by the applicable
TMDL.
ii.The Permittee shall sample discharges weekly, or as otherwise specified by the
TMDL, to evaluate compliance with the specific waste Load allocations or
requirements.
iii. Analytical methods used to meet the monitoring requirements shall conform to
the latest revision of the Guidelines Establishing Test Procedures for the
Analysis of Pollutants contained in 40 CFR Part 136. Turbidity and pH methods
Page 19 of 46
Alternatively, discharge turbidity may be measured at the point where the
discharge leaves the construction site, rather than in the receiving waterbody.
2. Based on sampling, if the discharge turbidity exceeds the water quality standard for
turbidity (more than 5 NTU over background turbidity when the background
turbidity is 50 NTU or less, or more than a 10% increase in turbidity when the
background turbidity is more than 50 NTU), all future discharges shall comply with
a numeric effluent limit which is equal to the water quality standard for turbidity.
3. If a future discharge exceeds the water quality standard for turbidity, the Permittee
shall:
a. Review the SWPPP for compliance with Condition S9 and make appropriate
revisions within 7 days of the discharge that exceeded the standard;
b. Fully implement and maintain appropriate source control and/or treatment BMPs
as soon as possible, but within :1.0 days of the discharge that exceeded the
standard;
c. Document BMP implementation and maintenance in the site log book;
d. Notify the appropriate Ecology Regional Office by phone within 24 hours of
analysis;
e. Continue to sample daily until discharge turbidity meets the water quality
standard for turbidity.
C. Discharges to waterbodies on the 303(d) list for High pH
1.. Permittees which discharge to waterbodies on the 303(d) list for high pH shall
conduct sampling at one of the following locations to evaluate compliance with the
water quality standard for pH (in the range of 6.5 — 8.5):
a. pH shall be measured at the point of discharge into the 303(d) listed waterbody,
inside the area of influence of the discharge; or
b. Alternatively, pI-i may be measured at the point where the discharge leaves the
construction site, rather than in the receiving water.
2. Based on the sampling set forth above, if the pH exceeds the water quality standard
for p1 -I (in the range of 6.5 — 8.5), all future discharges shall comply with a numeric
effluent limit which is equal to the water quality standard for pI-I.
3. If a future discharge exceeds the water quality standard for pH, the Permittee shall:
a. Review the SWPPP for compliance with Condition S9 and make appropriate
revisions within 7 clays of the discharge that exceeded the water quality standard;
Page 18 of 46
requestor within 10 days of receipt of the request where the plans and records
may be viewed and/or copied.
S6. PERMIT FEES
The Permittee shall pay permit fees assessed by Ecology. Fees for stormwater discharges
covered under this permit shall be established by Chapter 173-224 WAC. Permit fees will
continue to be assessed until the permit is terminated in accordance with Special Condition
S10 or revoked in accordance with General Condition G5.
S7. SOLID AND LIQUID WASTE DISPOSAL
Solid and Iiquid wastes generated by construction activity such as demolition debris,
construction materials, contaminated materials, and waste materials from maintenance
activities, including liquids and solids from cleaning catch basins and other stormwater
facilities, shall be handled and disposed of in accordance with:
1. Special Condition S3, Compliance with Standards, and
2. WAC 173-216-110, and other applicable regulations.
S8. DISCHARGES TO 303(D) OR TMDL WA T ERBODIES
A. Sampling and Numeric Effluent Limitations For Discharges to 303(d) -Listed Waterbodies
1. 1..Permittees that discharge to water bodies listed as impaired by the State of
Washington under Section 303(d) of the Clean Water Act for turbidity, fine
sediment, high pH, or phosphorus, shall conduct water quality sampling according
to the requirements of this section. •
2. All references and requirements associated with Section 303(d) of the Clean Water
Act mean the most current listing by Ecology of impaired waters that exists on
November 16, 2005, or the date when the operator's complete permit application is
received by Ecology, whichever is later.
B. Discharges to 303(d) -Listed Waterbodies (Turbidity, Fine Sediment, or Phosphorus)
1. Permittees which discharge to waterbodies on the 303(d) list for turbidity, fine
sediment, or phosphorus shall conduct turbidity sampling at the following locations
to evaluate compliance with the water quality standard for turbidity:
a. Background turbidity shall be measured in the 303(d) -listed receiving water
immediately upstream (upgradient) or outside the area of influence of the
discharge; and
b. Discharge turbidity shall be measured at the point of discharge into the 303(d)
listed receiving waterbody, inside the area of influence of the discharge; or
Page 17 of 46
3. Submit a detailed written report to Ecology within five (5) days, unless requested
earlier by Ecology. The report shall contain a description of the noncompliance,
including exact dates and times, and if the noncompliance has not been corrected, the
anticipated time it is expected to continue; and the steps taken or planned to reduce,
eliminate, and prevent reoccurrence of the noncompliance.
Compliance with these requirements does not relieve the Permittee from
responsibility to maintain continuous compliance with the terns and conditions of
this permit or the resulting liability for failure to comply.
G. Access to Plans and Records
1. The Permittee shall retain the following permit documentation (plans and records) on-
site, or within reasonable access to the site, for use by the operator; or on-site review
by Ecology or the local jurisdiction:
a. General Permit;
b. Permit Coverage Letter;
c. Stormwater Pollution Prevention Plan (SWPPP); and
d. Site Log Book
2. The Permittee(s) shall address written requests for plans and records listed above
(Condition S5.G.1) as follows:
a. A copy of plans and records shall be provided to Ecology within 14 days of
receipt of a written request from Ecology.
b. A copy of plans and records shall be provided to the public when requested in
writing. Upon receiving a written request from the public for the Permittee's
plans and records, the Permittee shall either:
i. Provide a copy of the plans and records to the requestor within 14 days of a
receipt of the written request; or
ii. Notify the requestor within 10 days of receipt of the written request of the
location and times within normal business hours when the plans and records
may be viewed, and provide access to the plans and records within 14 days of
receipt of the written request; or
iii. Within 14 days of receipt of the written request, the Permittee may submit a
copy of the plans and records to Ecology for viewing and/or copying by the
requestor at an Ecology office, or a mutually agreed upon location. If plans
and records are viewed and/or copied at a location other than at an Ecology
office, the Permittee will provide reasonable access to copying services for
which a reasonable fee may be charged. The Permittee shall notify the
Page 16 of 46
Department of Ecology
Water Quality Program - Construction Stormwater
PO Box 47696
Olympia, Washington 98504-7696
C. Records Retention
The Permittee shall retain records of all monitoring information (site log book, sampling
results, inspection reports/checklists, etc.), Stormwater Pollution Prevention Plan, and
any other documentation of compliance with permit requirements during the life of the
construction project and for a minimum of three years following the termination of
permit coverage. Such information shall include all calibration and maintenance records,
and records of all data used to complete the application for this permit. This period of
retention shall be extended during the course of any unresolved litigation regarding the
discharge of pollutants by the Permittee or when requested by Ecology.
D. Recording of Results
For each measurement or sample taken, the Permittee shall record the following
information:
:1. Date, place, method, and time of sampling or measurement;
2. The individual who performed the sampling or measurement;
3. The dates the analyses were performed;
4. The individual who performed the analyses;
5. The analytical techniques or methods used; and
6. The results of all analyses.
E. Additional Monitoring by the Permittee
If the Permittee monitors any pollutant more frequently than required by this permit using
test procedures specified by Condition S4 of this permit, the results of this monitoring
shall be included in the calculation and reporting of the data submitted in the Permittee's
DMR.
F. Noncompliance Notification
In the event the Permittee is unable to comply with any of the terns and conditions of
this permit which may cause a threat to human health or the environment, the Permittee
shall:
1. immediately notify Ecology of the failure to comply.
2. Immediately take action to prevent the discharge/pollution, or otherwise stop or
correct the noncompliance, and, if applicable, repeat sampling and analysis of any
noncompliance immediately and submit the results to Ecology within five (5) days
after becoming aware of the violation.
Page 15 of 46
a. "Engineered soils" means soil amendments including, but not limited, to Portland
cement treated base (CTB), cement kiln dust (CKD), or fly ash.
3. During the pH monitoring period, the Permittee shall obtain a representative sample
of stormwater and conduct pH analysis at least once per week.
4. The Permittee shall monitor pH in the sediment trap/pond(s) or other locations that
receive stormwater runoff from the area of significant concrete work or engineered
soils prior to discharge to surface waters.
5. The benchmark value for pH is 8.5 standard units. Any time sampling indicates that
p1 -I is 8.5 or greater, the Permittee shall:
a. Prevent the high pH water (8.5 or above) from entering storm sewer systems or
surface waters; and
b. If necessary, adjust or neutralize the high pH water using an appropriate treatment
BMP such as CO2 sparging or dry ice. The Permittee shall obtain written
approval from Ecology prior to using any form of chemical treatment other than
CO2 sparging or dry ice.
6. The Permittee shall perform pH analysis on-site with a calibrated pH meter, pI-I test
kit, or wide range pH indicator paper. The Permittee shall record pH monitoring
results in the site log book.
S5. REPORTING AND RECORDKEEPING REQUIREMENTS
A. High Turbidity Phone Reporting
Any time sampling performed in accordance with Special Condition S4.0 indicates
turbidity is 250 NTU or greater (or transparency is 6 cm or less) the Permittee shall notify
the appropriate Ecology regional office by phone within 24 hours of analysis.
13. Discharge Monitoring Reports
1. Permittees required to conduct water quality sampling in accordance with Special
Conditions S.4.0 (Turbidity/Transparency), S4.D (pH) and/or S8 [303(d)/TMDL
sampling] shall submit the results to Ecology monthly on Discharge Monitoring
Report (DMR) forms provided by Ecology.
Permittees are authorized and encouraged to submit electronic DMRs using the "E -
DMR Form" on Ecology's Construction Stormwater web site:
http://www.ecy.wa.gov/programs/wq/stormwater/construction/.
2. The Permittee shall submit DMR forms electronically or by mail to be received by
Ecology within 15 days following the end of each month. If there was no discharge
during a given monitoring period, the Permittee shall submit the form as required
with the words "no discharge" entered in place of the monitoring results. If the
Permittee is unable to submit discharge monitoring reports electronically, the
Permittee may mail reports to the address listed below:
-_Page 14 of 46
If discharge turbidity is greater than or equal to 250 NTU; or if discharge
transparency is less than or equal to 6 cm, the CESCL shall:
i. Notify Ecology by phone in accordance with Condition S5.A.; and
ii. Review the SWPPP for compliance with Condition S9 and make appropriate
revisions within 7 days of the discharge that exceeded the benchmark; and
iii. Fully implement and maintain appropriate source control and/or treatment
BMPs as soon as possible, but within 10 days of the discharge that
exceeded the benchmark;
iv. Document BMP implementation and maintenance in the site log book; and
v. Continue to sample discharges daily until:
1. turbidity is 25 NTU (or lower); or
2. transparency is 31 cm (or greater); or
3. the CESCL has demonstrated compliance with the water quality
standard for turbidity:
a. no more than 5 NTU over background turbidity, if background is
less than 50 NTU, or
b. no more than 10% over background turbidity, if background is 50
NTU or greater; or
4. the discharge stops or is eliminated.
D. pH Monitoring: Sites with Significant Concrete Work or Engineered Soils
Beginning October 1, 2006, if construction activity will result in the disturbance of 1
acre or more, and involves significant concrete work or the use of engineered soils, and
stormwater from the affected area drains to surface waters of the state or to a storm
sewer system that drains to surface waters of the state, the Permittee shall conduct pH
monitoring as set forth below:
1. For sites with significant concrete work, the pH monitoring period shall commence
when the concrete is first exposed to precipitation and continue weekly until
stormwater pH is 8.5 or less.
a. "Significant concrete work" means greater than 1000 cubic yards poured concrete
or recycled concrete.
2. For sites with engineered soils, the pH monitoring period shall commence when the
soil amendments are first exposed to precipitation and shall continue until the area of
engineered soils is fttlly stabilized.
Page 13 of 46
3. Sampling Locations
a. Sampling is required at all discharge points where stormwater (or authorized non-
stormwater) is discharged off-site.
b. All sampling point(s) shall be identified on the SWPPP site map and be clearly
marked in the field with a flag, tape, stake or other visible marker.
4. Sampling and Analysis Methods
a. Turbidity analysis shall be performed with a calibrated turbidity meter
(turbidimeter), either on-site or at an accredited lab. The results shall be recorded
in the site log book in Nephelometric Turbidity Units (NTU).
b. Transparency analysis shall be performed on-site with a 1 Y4 inch diameter, 60
centimeter (cm) long Transparency Tube. The results shall be recorded in the site
log book in centimeters (cm). Transparency Tubes are available from:
http://watermonitoringequip.com/pages/stream.html
Parameter
Units
Analytical
Method
Sampling
Frequency
Benchmark
Value
Turbidity
NTU
SM2130 or
EPA1.80.1
Weekly, if
discharging
25 NTU
Transparency
cm
Manufacturer
instructions, or
Ecology
Guidance
Weekly, if
discharging
31 cm
5. Turbidity/Transparency Benchmark Values
The benchmark value for turbidity is 25 NTU (Nephelometric Turbidity Units); and
the benchmark value for transparency is 31 cm.
a. Turbidity 26 — 249 NTU, or Transparency 30 -- 7 cm:
If discharge turbidity is greater than 25 NTU, but less than 250 NTU; or if
discharge transparency is less than 31 cm, but greater than 6 cm, the CESCL
shall:
i. Review the SWPPP for compliance with Condition S9 and make appropriate
revisions within 7 days of the discharge that exceeded the benchmark; and
ii. Fully implement and maintain appropriate source control and/or treatment
BMPs as soon as possible, but within 10 days of the discharge that
exceeded the benchmark; and
iii. Document BMP implementation and maintenance in the site log book.
b. Turbidity 250 NTU or greater. or Transparency 6 cm or less:
Page 12 of 46 _
ii. locations of BMPs that need maintenance,
iii. the reason maintenance is needed,
iv. locations of BMPs that failed to operate as designed or intended, and
v. locations where additional or different BMPs are needed, and the reason(s) why.
e. A description of stormwater discharged from the site. The inspector shall note the
presence of suspended sediment, turbid water, discoloration, and/or oil sheen, as
applicable.
f. Any water quality monitoring performed during inspection.
g. General comments and notes, including a brief description of any BMP repairs,
maintenance or installations made as a result of the inspection.
h. A statement that, in the judgment of the person conducting the site inspection, the
site is either in compliance or out of compliance with the terms and conditions of
the SWPPP and the permit. If the site inspection indicates that the site is out of
compliance, the inspection report shall include a summary of the remedial actions
required to bring the site back into compliance, as well as a schedule of
implementation.
i. Name, title, and signature of the person conducting site inspection; and the
following statement: "I certify that this report is true, accurate, and complete, to
the best of nay knowledge and belief".
C. Turbidity/Transparency Sampling Requirements
1. Sampling Methods/Effective Dates
a. Beginning October 1, 2006, if construction activity will involve the disturbance
of. 5 acres or more, the Permittee shall conduct turbidity sampling per Condition
S4.C.
b. Beginning October 1, 2008, if construction activity will involve greater than or
equal to 1 acre, but less than 5 acres of soil disturbance, the Permittee shall
conduct transparency sampling or turbidity sampling per Condition S4.C.
2. Sampling Frequency
a. Sampling shall be conducted at least once every calendar week, when there is a
discharge of stormwater (or authorized non-stormwater) from the site. Samples
shall be representative of the flow and characteristics of the discharge.
b. When there is no discharge during a calendar week, sampling is not required.
c. Sampling is not required outside of normal working hours or during unsafe
conditions. If a Permittee is unable to sample during a monitoring period, the
Discharge Monitoring Report (DMR) shall include a brief explanation.
Page 11 of 46
presence of suspended sediment, turbidity, discoloration, and oil sheen. Inspectors
shall evaluate the effectiveness of BMPs and determine if it is necessary to install,
maintain, or repair BMPs to improve the quality of stormwater discharges.
Based on the results of the inspection, the Permittee shall correct the problems
identified as follows:
a. Review the SWPPP for compliance with Condition S9 and make appropriate
revisions within 7 days of the inspection; and
b. Fully implement and maintain appropriate source control and/or treatment BMPs
as soon as possible, but no later than 10 days of the inspection; and
c. Document BMP implementation and maintenance in the site log book.
2. The site inspections shall be conducted at least once every calendar week and within
24 hours of any discharge from the site. The inspection frequency for temporarily
stabilized, inactive sites inay be reduced to once every calendar month.
3. Site inspections shall be conducted by a person who is knowledgeable in the
principles and practices of erosion and sediment control. The inspector shall have the
skills to:
a. Assess the site conditions and construction activities that could impact the quality
of stormwater, and
b. Assess the effectiveness of erosion and sediment control measures used to control
the quality of stormwater discharges.
4. Beginning October 1, 2006, construction sites one acre or larger that discharge
stormwater to surface waters of the state, shall have site inspections conducted by a
Certified Erosion and Sediment Control Lead (CESCL). The CESCL shall be
identified in the SWPPP and shall be present on-site or on-call at all times.
Certification shall be obtained through an approved erosion and sediment control
training program that meets the minimum training standards established by Ecology
(see BMP C1.60 in the Manual).
5. The inspector shall summarize the results of each inspection in an inspection report or
checklist and be entered into, or attached to, the site log book. At a minimum, each
inspection report or checklist shall include:
a. Inspection date and time.
b. Weather information; general conditions during inspection and approximate
amount of precipitation since the last inspection, and within the last 24 hours.
c. A summary or list of all BMPs which have been implemented, including
observations of all erosion/sediment control structures or practices.
d. The following shall be noted:
i. locations of BMPs inspected,
Page 10 of 46
S4. MONITORING REQUIREMENTS
The primary monitoring requirements are summarized in Table 3 (below):
Table 3. Summary of Monitoring Requirements'
Size of Soil Disturbance2
Weekly
Site
Inspections
Weekly
Sampling w/
Turbidity Meter
Weekly
Sampling w/
Transparency
Tube
Weekly
pH
sampling3
Sites which disturb less than 1
acre
Required
Not Required
Not Required
Not
Required
Sites which disturb 1 acre or
more, but less than 5 acres
Required
Sampling Required — either
method
Required
Sites which disturb 5 acres or
more
Required
Required
Not Requireds
Required
A. Site Log Book
The Permittee shall maintain a site log book that contains a record of the
implementation of the SWPPP and other permit requirements including the installation
and maintenance of BMPs, site inspections, and stormwater monitoring.
B. Site Inspections
1. Site inspections shall include all areas disturbed by construction activities, all BMPs,
and all stormwater discharge points. Stormwater shall be visually examined for the
Additional monitoring requirements may apply for: 1) discharges to 303(d) listed waterbodies and waterbodies
with applicable TMDLs for turbidity, fine sediment, high pH, or phosphorus - see Condition S8; and 2) sites
required to perform additional monitoring by Ecology order — see Condition G13.
Soil disturbance is calculated by adding together all areas affected by construction activity. Construction Activity
means clearing, grading, excavation, and any other activity which disturbs the surface of the land, including
ingress/egress from the site.
3 Beginning October 1, 2006, if construction activity involves significant concrete work or the use of engineered
soils, and stormwater from the affected area drains to a stormwater collection system or other surface water, the
Permittee shall conduct p11 sampling in accordance with Condition S4.D.
t Beginning October 1, 2008, sites with one or more acres, but less than 5 acres of soil disturbance, shall conduct
turbidity or transparency sampling in accordance with Condition S4.C.
5 Beginning October 1, 2006, sites greater than or equal to 5 acres of soil disturbance shall conduct turbidity
sampling using a turbidity meter in accordance with Condition S4.C.
Page 9 of 46
a. Recalculate the rainfall erosivity "R" factor using the original start date and a new
projected ending date and, if the "R" factor is still under 5 and the entire project
falls within the applicable regional timeframe in S2.C.2.b, complete and submit
an amended waiver certification form before the original waiver expires; or
b. Submit a complete permit application to Ecology in accordance with Condition
S2.A and B before the end of the certified waiver period.
S3. COMPLIANCE WITH STANDARDS
A. Discharges shall not cause or contribute to a violation of surface water quality standards
(Chapter 173-201A WAC), ground water quality standards (Chapter 173-200 WAC),
sediment management standards (Chapter 173-204 WAC), and human health -based
criteria in the National Toxics Rule (40 CFR Part 131.36). Discharges that are not in
compliance with these standards are not authorized.
B. Prior to the discharge of stormwater and non-stormwater to waters of the state, the
Permittee shall apply all known, available, and reasonable methods of prevention,
control, and treatment (AKART). This includes the preparation and implementation of an
adequate Stormwater Pollution Prevention Plan (SWPPP), with all appropriate best
management practices (BMPs) installed and maintained in accordance with the SWPPP
and the terms and conditions of this permit.
C. Compliance with water quality standards shall be presumed, unless discharge monitoring
data or other site specific information demonstrates that a discharge causes or contributes
to a violation of water quality standards, when the Permittee is:
1. In full compliance with all permit conditions, including planning, sampling,
monitoring, reporting, and recordkeeping conditions; and
2. Fully implementing stormwater BMPs contained in stormwater management manuals
published or approved by Ecology, or BMPs that are demonstrably equivalent to
BMPs contained in stormwater technical manuals published or approved by Ecology,
including the proper selection, implementation, and maintenance of all applicable and
appropriate BMPs for on-site pollution control.
D. For sites that discharge to both surface water and ground water, all ground water
discharges are also subject to the terms and conditions of this permit. Permittees who
discharge to ground water through an injection well shall comply with any applicable
requirements of the Underground Injection Control (UIC) regulations, Chapter 173-218
WAC.
Page.8_of 46_
C. Erosivity Waiver
Operators may qualify for a waiver from the permit if the following conditions are met:
1. The site will result in the disturbance of less than 5 acres; and the site is not a portion
of a common plan of development or sale that will disturb 5 acres or greater.
2. Calculation of Erosivity "R" Factor and Regional Timeframe:
a. The project's rainfall erosivity factor ("R" Factor) must be less than 5 during the
period of construction activity, as calculated using the Texas A&M University
online rainfall erosivity calculator at: http://ei.tamu.edu/. The period of
construction activity begins at initial earth disturbance and ends with final
stabilization; and, in addition:
b. The entire period of construction activity must fall within the following
• timeframes:
i. For sites west of the Cascades Crest: June 15 — September 15; or
ii. For sites east of the Cascades Crest, excluding the Central Basin: June 15 —
October 15; or
iii. For sites east of the Cascades Crest, within the Central Basin*: no additional
timeframe restrictions apply.
*Note: The Central Basin is defined as the portions of Eastern Washington
with mean annual precipitation of less than 12 inches.
3. Operators must submit a complete Erosivity Waiver Certification Form at least one
week prior to commencing land disturbing activities. Certification must include:
a. A statement that the operator will comply with applicable local stormwater
requirements; and
b. A statement that the operator will implement appropriate erosion and sediment
control BMPs to prevent violations of water quality standards.
4. This waiver is not available for facilities declared a significant contributor of
pollutants as defined in Condition S1.B.1.b.
5. This waiver does not apply to construction activity which includes non-stormwater
discharges listed in S1.C.3.
6. If construction activity extends beyond the certified waiver period for any reason, the
operator shall either:
Page 7 of 46
from construction activities. The 30 -day public comment period required by WAC
173-226-130(5) begins on the publication date of the second public notice. Unless
Ecology responds to the complete application in writing, based on public
comments, or any other relevant factors, coverage under the general permit will
automatically commence on the thirty-first day following receipt by Ecology of a
completed NOI, or the issuance date of this permit, whichever is later; unless a
later date is specified by Ecology in writing.
c. Applicants that discharge to a storm sewer system operated by Seattle, King
County, Snohomish County, Tacoma, Pierce County, or Clark County shall also
submit a copy of the NOI to the appropriate jurisdiction.
2. Transfer of Coverage Forni
Current coverage under this permit may be transferred to one or more new operators,
including operators of sites within a Common Plan of Development, by submitting
a Transfer of Coverage Form in accordance with Condition G9. Transfers do not
require public notice.
B. Public Notice
For new or previously unpernitted sites, the applicant shall publish a public notice at
least one time each week for two consecutive weeks, with a 7 -day time span between
dates, in a newspaper that has general circulation in the county in which the construction
is to take place. The notice shall contain the following:
1. A statement that "The applicant is seeking coverage under the Washington State
Department of Ecology's Construction Stormwater NPDES and State Waste Discharge
General Permit";
2. The name, address and location of the construction site;
3. The name and address of the applicant;
4. The type of construction activity that will result in a discharge, (e.g., residential
construction, commercial construction, etc.) and the number of acres to be disturbed;
5. The name of the receiving water(s) (i.e., the surface water(s) that the site will discharge
to), or if the discharge is through a storm sewer system, the name of the operator of the
storm sewer; and
6. The statement: "Any person desiring to present their views to the Department of
Ecology regarding this application, or interested in the Department's action on this
application may notify the Department of. Ecology in writing within 30 days of the last
date of publication of this notice. Comments can be submitted to: Department of
Ecology, P.O. Box 47696, Olympia, WA 98504-7696, Attn: Water Quality Program,
Construction Stormwater".
Page 6 of 46
All authorized non-stormwater discharges, except for discharges from fire fighting
activities, shall be adequately addressed in the SWPPP and comply with Special
Condition S3.
D. Limitations on Coverage
The Director may require any discharger to apply for and obtain coverage under an
individual permit or another more specific general permit. Such alternative coverage
will be required when Ecology determines that this general permit does not provide
adequate assurance that water quality will be protected; or there is a reasonable potential
for the project to cause or contribute to a violation of water quality standards.
The following stormwater discharges are not covered by this permit:
1. Post -construction stormwater discharges that originate from the site after construction
activities have been completed and the site has undergone final stabilization.
2. Nonpoint source silvicultural activities such as nursery operations, site preparation,
reforestation and subsequent cultural treatment, thinning, prescribed burning, pest and
fire control, harvesting operations, surface drainage, or road construction and
maintenance from which there is natural runoff as excluded in 40 CFR Subpart
122.27.
3. Stormwater from any federal project or project on federal land or land within an
Indian Reservation except for the Puyallup Reservation. Within the Puyallup
Reservation, any project that discharges to surface water on land held in trust by the
federal government may be covered by this permit.
4. Stormwater from any site covered under an existing NPDES individual permit in
which stormwater management and/or treatment requirements are included for all
stormwater discharges associated with construction activity.
5. Where an applicable Total Maximum Daily Load (TMDL) specifically precludes or
prohibits discharges from construction activity, the operator is not eligible for
coverage under this permit.
S2. APPLICATION REQUIREMENTS
A. Permit Application Forms
1. Notice of Intent Forni/Timeline
a. Operators of new or previously unpermitted construction activities shall submit a
complete and accurate permit application form [Notice of Intent (NOI)} to
Ecology. Applicants are encouraged to use Ecology's internet-based electronic
NOI to apply for permit coverage.
b. 'The NOI shall be submitted on or before the date of the first public notice (see
Condition S2.B below) and at least 60 days prior to the discharge of stormwater
Page 5 of 46
C. Authorized Discharges:
1. Stormwater Associated with Construction Activity. Subject to compliance with the
terms and conditions of this permit, Permittees are authorized to discharge
stormwater associated with construction activity to surface waters of the state or to a
storm sewer system that drains to surface waters of the state.
2. Stormwater Associated with Construction Support Activity. This permit also
authorizes stormwater discharges from support activities related to the permitted
construction site (e.g., off-site equipment staging yards, material storage areas,
borrow areas, etc.) provided:
a. The support activity is directly related to the permitted construction site that is
required to have an NPDES permit; and
b. The support activity is not a commercial operation serving multiple unrelated
construction projects, and does not operate beyond the completion of the
construction activity; and
c. Appropriate controls and measures are identified in the Stormwater Pollution
Prevention Plan (SWPPP)for the discharges from the support activity areas.
3. Non-Stormwater Discharges. The categories and sources of non-stormwater
discharges identified below are conditionally authorized, provided the discharge is
consistent with the terms and conditions of this permit:
a. Discharges from fire fighting activities;
b. Fire hydrant system flushing;
c. Potable water including uncontaminated water line flushing (de -chlorinated);
d. Pipeline hydrostatic test water;
e. Uncontaminated air conditioning or compressor condensate;
f. Uncontaminated ground water or spring water;
g. Uncontaminated excavation de -watering (in accordance with S9.D.10)
h. Uncontaminated discharges from foundation or footing drains;
i. Water used to control dust;
j. Routine external building wash down that does not use detergents; and
k. Landscape irrigation.
Page 4 of 46
SPECIAL CONDITIONS
Si. PERMIT COVERAGE
A. Permit Area
This general permit covers all areas of Washington State, except for federal and tribal
lands specified in S1.D.3.
B. Operators Required to Seek Coverage Under this General Permit:
1. Operators of the following construction activities are required to seek coverage under
this permit:
a. Clearing, grading and/or excavation which results in the disturbance of one or
more acres, and discharges stormwater to surface waters of the state; and clearing,
grading and/or excavation on sites smaller than one acre which are part of a larger
common plan of development or sale, if the common plan of development or sale
will ultimately disturb one acre or more, and discharges stormwater to surface
waters of the state.
i. This includes forest practices that are part of a construction activity that will
result in the disturbance of one or more acres, and discharges to surface waters
of the state (i.e., forest practices which are preparing a site for construction
activities); and
b. Any size construction activity discharging stormwater to waters of the state which
the Department of Ecology (Ecology):
i. Determines to be a significant contributor of pollutants to waters of the state of
Washington, or
ii. Reasonably expects to cause a violation of any water quality standard.
2. Operators of the following activities are not required to seek coverage under this
permit, unless specifically required under Condition S1.B.1.b. (Significant
Contributor):
a. Construction activities which discharge all stormwater and non-stormwater to
ground water, and have no point source discharge to surface water or a storm
sewer system that drains to surface waters of the state;
b. Construction activities covered under an Erosivity Waiver (Condition S2.C);
c. Routine maintenance that is performed to maintain the original line and grade,
hydraulic capacity, or original purpose of a facility.
Page 3 of 46
G22. REPORTING ANTICIPATED NON-COMPLIANCE 35
G23. REQUESTS TO BE EXCLUDED FROM COVERAGE UNDER THE PERMIT 36
G24. APPEALS 36
G25. SEVERABILITY 36
G26. BYPASS PROHIBITED 36
APPENDIX A — DEFINITIONS 39
APPENDIX B — ACRONYMS 46
SUMMARY OF PERMIT REPORT SUBMITTALS
Refer to the Special and General Conditions for additional submittal requirements.
Permit
Section
S5.A
S5.B
Submittal
Frequency
First Submittal Date
High Turbidity/Transparency Phone
Reporting
Discharge Monitoring Report
S5.F Noncompliance Notification
S5.F Noncompliance Notification — Written
Report
02. Notice of Change in Authorization
G6. Permit Application for Substantive
Changes to the Discharge
G8. Application for Permit Renewal
09. Notice of Permit Transfer
G20. Notice of Planned Changes
G22. Reporting Anticipated Non-compliance
As Necessary
Monthly
As necessary
As necessary
As necessary
As necessary
I/permit cycle
As necessary
As necessary
As necessary
Within 24 hours
Within 15 days after the
applicable monitoring
period
Immediately
Within 5 Days of non-
compliance
No later than 180 days
before expiration
SUMMARY OF REQUIRED ON SITE DOCUMENTATION
Permit Conditions
Document Title
Conditions S2, S5
Permit Coverage Letter
Conditions S2, S5
Construction Stormwater General Permit
Conditions S4, S5
Site Log Book
Conditions S9, S5
Stormwater Pollution Prevention Plan (SWPPP)
Page 2 of 46
TABLE OF CONTENTS
SUMMARY OF PERMIT REPORT SUBMITTALS 3
SUMMARY OF REQUIRED ON SITE DOCUMENTATION 3
SPECIAL CONDITIONS
Si. PERMIT COVERAGE 4
S3. COMPLIANCE WITH STANDARDS 9
S4. MONITORING REQUIREMENTS 10
S5. REPORTING AND RECORDKEEPING REQUIREMENTS 15
S6. PERMIT FEES 18
S7. SOLID AND LIQUID WASTE DISPOSAL 18
S8. DISCHARGES TO 303(d) OR TMDL WATERBODIES 18
S9. STORMWATER POLLUTION PREVENTION PLAN 21
S10. NOTICE OF TERMINATION 29
GENERAL CONDITIONS 30
01. DISCHARGE VIOLATIONS 30
G2. SIGNATORY REQUIREMENTS 30
G3. RIGHT OF INSPECTION AND ENTRY 31.
G4. GENERAL PERMIT MODIFICATION AND REVOCATION 31
05. REVOCATION OF COVERAGE UNDER THE PERMIT 31
G6. REPORTING A CAUSE FOR MODIFICATION 32
G7. COMPLIANCE WITH OTHER LAWS AND STATUTES 32
G8. DUTY TO REAPPLY 32
G9. TRANSFER OF GENERAL PERMIT COVERAGE 32
G10. REMOVED SUBSTANCES 33
G11. DUTY TO PROVIDE INFORMATION 33
G12. OTHER REQUIREMENTS OF 40 CFR 33
G13. ADDITIONAL MONITORING 33
G14. PENALTIES FOR VIOLATING PERMIT CONDITIONS • 33
G15. UPSET 34
G16. PROPERTY RIGHTS 34
017. DUTY TO COMPLY 34
G18. TOXIC POLLUTANTS 34
G19. PENALTIES FOR TAMPERING 35
G20. REPORTING PLANNED CHANGES 35
G21. REPORTING OTHER INFORMATION 35
Issuance Date: November 16, 2005
Effective Date: December 16, 2005
Expiration Date: December 16, 2010
CONSTRUCTION STORMWATER GENERAL PERMIT
National Pollutant Discharge Elimination System (NPDES) and State Waste
Discharge General Permit for Stormwater Discharges Associated With
Construction Activity
State of Washington
Department of Ecology
Olympia, Washington 98504-7600
In compliance with the provisions of
The State of Washington Water Pollution Control Law
Chapter 90.48 Revised Code of Washington
and
The Federal Water Pollution Control Act
(The Clean Water Act)
Title 33 United States Code, Section 1251 et seq.
Until this permit expires, is modified or revoked, Permittees that have properly obtained
coverage under this general permit are authorized to discharge in accordance with the special and
general conditions which follow.
David C. Peeler, Manager
Water Quality Program
Washington State Department of Ecology
Appendix D — General Permit
(Please insert NPDES General Permit)
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 31
September 7, 2010
Catch Basin Filters
Alternative BMP not included in the SWMMWW (2005) or SWNNEW (2004)
Curb Inlet Protection
Wooden Weir
Block and Gravel Curb Inlet Protection
Alternative BMP not included in the SWMMWW (2005) or SWNNEW (2004)
Culvert Inlet Protection
Culvert Inlet Sediment Trap
Alternative BMP not included in the SWMMWW (2005) or SWNNEW (2004)
Element #8 - Stabilize Channels and Outlets
Grass -Lined Channels (BMP C201)
Channel Lining (BMP C202)
Level Spreader (BMP C206)
Check Dams (BMP C207)
Triangular Silt Dike (Geotextile-Encased Check Dam; BMP C208)
Outlet Protection (BMP C209)
Materials on Hand (BMP C150)
Alternative BMP not included in the SWMMWW (2005) or SWNNEW (2004)
Element #10 - Control Dewatering
Concrete Handling (BMP C151)
Temporary Sediment Pond (BMP C241)
Construction Stormwater Filtration (BMP C251)
Construction Stormwater Chemical Treatment (BMP C250)
Infiltration
Use of a sedimentation bag, with outfall to a ditch or swale for small volumes of
localized dewatering.
Alternative BMP not included in the SWMMWW (2005) or SWNNEW (2004)
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 30
September 7, 2010
Materials on Hand (BMP C150)
Detention Pond or Vault
Alternative BMP not included in the SWMMWW (2005) or SWNNEW (2004)
Temporary Sediment Pond (BMP C241) (See instructions)
Construction Stormwater Filtration (BMP C251) (See instructions)
Construction Stormwater Chemical Treatment (BMP C250) (See instructions)
Element #5 - Stabilize Soils
Temporary and Permanent Seeding (BMP C120)
Mulching (BMP C121)
Nets and Blankets (BMP C122)
Plastic Covering (BMP C 123)
Sodding (BMP C124)
Topsoiling (BMP C125)
Polyacrylamide for Soil Erosion Protection (BMP C126)
Surface Roughening (BMP C130)
Gradient Terraces (BMP C131)
Dust Control (BMP C140)
Small Project Construction Stormwater Pollution (BMP 180): may not be applicable
Early application of gravel base to areas to be paved
Early application of gravel (i.e. recycled brick and concrete) to graded stockpile areas
Materials on Hand (BMP C150)
Alternative BMP not included in the SWMMWW (2005) or SWNNEW (2004)
Element #6 - Protect Slopes
Temporary and Permanent Seeding (BMP C 120)
Surface Roughening (BMP C130)
Gradient Terraces (BMP C131)
Interceptor Dike and Swale (BMP C200)
Grass -Lined Channels (BMP C201)
Channel Lining (BMP C202)
Pipe Slope Drains (BMP C204
Subsurface Drains (BMP C205)
Level Spreader (BMP C206)
Check Dams (BMP C207)
Triangular Silt Dike (Geotextile-Encased Check Dam; BMP C208)
Straw Wattles (BMP C235
Materials on Hand (BMP C150)
Alternative BMP not included in the SWMMWW (2005) or SWNNEW (2004)
Element #7 — Protect Drain Inlets
Drop Inlet Protection
Excavated Drop Inlet Protection
Block and Gravel Drop Inlet Protection
Gravel and Wire Drop Inlet Protection.
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 29
September 7, 2010
Appendix C — Alternative BMPs
The following includes a list of possible alternative BMPs for each of the 12 elements not
described in the main SWPPP text. This list can be referenced in the event a BMP for a
specific element is not functioning as designed and an alternative BMP needs to be
implemented.
Element #1 - Mark Clearing Limits
Preserving Natural Vegetation (BMP C101)
Buffer Zones (BMP C102)
High Visibility Plastic or Metal Fence (BMP C103)
Stake and Wire Fence (BMP C104)
Alternative BMP not included in the SWMMWW (2005) or SWNNEW (2004)
Element #2 - Establish Construction Access
Stabilized Construction Entrance (BMP C105)
Wheel Wash (BMP C106)
Construction Road/Parking Area Stabilization (BMP C107)
Water Bars (BMP C203)
Alternative BMP not included in the SWMMWW (2005) or SWNNEW (2004)
Element #3 - Control Flow Rates
Straw Wattles (BMP C235)
Sediment Trap (BMP C240)
Temporary Sediment Pond (BMP C241)
Check Dams (BMP C207)
Triangular Silt Dike (Geotextile-Encased Check Dam; BMP C208)
Detention Pond or Vault
Infiltration Trench
Alternative BMP not included in the SWMMWW (2005) or SWNNEW (2004)
Element #4 - Install Sediment Controls
Straw Bale Barrier (BMP C230)
Brush Barrier (BMP C231)
Gravel Filter Berm (BMP C232)
Silt Fence (BMP C233)
Vegetated Strip (BMP C234)
Straw Wattles (BMP C235)
Sediment Trap (BMP C240)
Storm Drain Inlet Protection (BMP C 220)
Portable Water Storage Tanks (e.g., Baker Tank) for Sedimentation
Storm Water Pollution Prevention Plan
Sabey Corporation, Northwest Auto Stockpile
Page 28
September 7, 2010
Construction Criteria
• Trench Preparation -Excavated materials must be placed away from
the trench sides to enhance trench wall stability. Care should also be
taken to keep this material away from slopes, neighboring property,
sidewalks and streets. It is recommended that this material be covered
with plastic. (see Erosion/sediment control Criteria in Volume II).
• Stone Aggregate Placement and Compaction - The stone aggregate
should be placed in lifts and compacted using plate compactors. As a
rule of thumb, a maximum loose lift thickness of 12 inches is
recommended. The compaction process ensures geotextile conformity
to the excavation sides, thereby reducing potential piping and
geotextile clogging, and settlement problems.
• Potential Contamination - Prevent natural or fill soils from intermixing
with the stone aggregate. All contaminated stone aggregate must be
removed and replaced with uncontaminated stone aggregate.
• Overlapping and Covering -Following the stone aggregate placement,
the geotextile must be folded over the stone aggregate to form a 12
inch minimum longitudinal overlap. When overlaps are required
between rolls, the upstream roll should overlap a minimum of 2 feet
over the downstream roll in order to provide a shingled effect.
• Voids behind Geotextile - Voids between the geotextile and
excavation sides must be avoided. Removing boulders or other
obstacles from the trench walls is one source of such voids. Natural
soils should be placed in these voids at the most convenient time
during construction to ensure geotextile conformity to the excavation
sides. Soil piping, geotextile clogging, and possible surface
subsidence will be avoided by this remedial process.
• Unstable Excavation Sites - Vertically excavated walls may be
difficult to maintain in areas where the soil moisture is high or where
soft or cohesionless soils predominate. Trapezoidal, rather than
rectangular, cross-sections may be needed.
Maintenance Criteria
Sediment buildup in the top foot of stone aggregate or the surface inlet
should be monitored on the same schedule as the observation well.
February 2005 Volume 111— Hydrologic Analysis and Flow Control BMPs 3.103
Design Criteria
• Due to accessibility and maintenance limitations infiltration trenches
must be carefully designed and constructed. The local jurisdiction
should be contacted for additional specifications.
• Consider including an access port or open or grated top for
accessibility to conduct inspections and maintenance.
• Backfill Material - The aggregate material for the infiltration trench
should consist of a clean aggregate with a maximum diameter of 3
inches and a minimum diameter of 1.5 inches. Void space for these
aggregates should be in the range of 30 to 40 percent.
• Geotextile fabric liner - The aggregate fill material shall be completely
encased in an engineering geotextile material. Geotextile should
surround all of the aggregate fill material except for the top one -foot,
which is placed over the geotextile. Geotextile fabric with acceptable
properties must be carefully selected to avoid plugging (see Appendix
V -C of Volume V).
• The bottom sand or geotextile fabric as shown in the attached figures
is optional.
Refer to the Federal Highway Administration Manual "Geosynthetic
Design and Construction Guidelines, " Publication No. FHWA HI -95-038,
May 1995 for design guidance on geotextiles in drainage applications.
Refer to the NCHRP Report 367, "Long -Term Performance of
Geosynthetics in Drainage Applications, " 1994, for long-term
performance data and background on the potential for geotextiles to clog,
blind, or to allow piping to occur and how to design for these issues.
• Overflow Channel - Because an infiltration trench is generally used for
small drainage areas, an emergency spillway is not necessary.
However, a non-erosive overflow channel leading to a stabilized
watercourse should be provided.
• Surface Cover -A stone filled trench can be placed under a porous or
impervious surface cover to conserve space.
• Observation Well - An observation well should be installed at the
lower end of the infiltration trench to check water levels, drawdown
time, sediment accumulation, and conduct water quality monitoring.
Figure 3.36 illustrates observation well details. It should consist of a
perforated PVC pipe which is 4 to 6 inches in diameter and it should
be constructed flush with the ground elevation. For larger trenches a
12-36 inch diameter well can be installed to facilitate maintenance
operations such as pumping out the sediment. The top of the well
should be capped to discourage vandalism and tampering.
3-102 Volume 111— Hydrologic Analysis and Flow Control BMPs February 2005
Permeable Filter Fabric Lines SIMS
and Also at One Foot Tench Depth
Sniirce• Schueler frenroduced with nermissionl
Figure 3.34 — Swale/Trench Design
Top View
Stormdrein
Inlet
Side View
Overflow
Pipe
Manholes
01.
for Cleanout
Access
Three -chamber Water Quality Inlet
Perforated Pipe Inlet
Underground 'trench
Impermeable Filter Cloth
Teat Well
I ( \�=11111C� =11'11Ill II /i\ IPIII.
6 Inch Inverted
Orilioes Elbow
Fi11,<F7/
8 Inch Sand Layer
Source: Schueler (reproduced with permission)
Figure 3.35 Underground Trench with Oil/Grit Chamber
February 2005 Volume 111— Hydrologic Analysis and Flow Control BMPs
3-101
Top View
Inflow
Side View
20' Grass Filter Stab
Woo lased with Permeable Piller ramie
Permeable Filter
Fabric One Fool (•'d. •: - .' Clean Washed atm oor Grewal
Below Sallee*, '1._� �!�.� � 11.5-3.0 Inch)
Traps Debris
Screened Owsrnew Pipe
Oulflow
Sol trap. Sr:hi IFthhr irPnrnritir.Pri with nPrmissinnl
.121neh Bend Filler
or Permeable filter
Cloth limes Bottom
Figure 3.32 Median Strip Trench Design
Side View Removable
Overflow Pipe Observation Well
Removable
777
Il •- 1 ,1 1 1 1 11 1 _ 1 r r•
,i„l,' ., -. . term- / `q. mar, v�lu,— ' \ lA`' d,'�i� -' \\ I II:
Wettest,
Observetion Weii
•
•
•
•
afollt9enny Overflow Sere' ::v . w ..;1=:t "��• rt:P.;� P••'�e'� 0. i: 4'
gR'b•''••••', • i ` �•}t'.Y.;:!=a'J
.•� '��= a •v � ,� Runon Fiitere Through ;.•.�,
°�'f . •o: ' +:` . S ?._�i.• _ �� :. c �%'� �O Foot Wide Grass Butler Striph b
• Protective Layer of Filter Fabric
Fitter Fabric Lines Sides to
Prevent Soil Contamination
�< o\ Sand Filter(8-12) Inches
Deep or Fabric Equivalent
11/\\ p�•\ �—
.1 ��//; uno Exfiltrates
Threw. Unlisrurbod Subsoils` --'
wit,' a Minimum re of q.S Incites/Noor
Figure 3.30 — Schematic of an Infiltration Trench
Top View
Slope 01
Paraing 1.01
Side View
Berm (Grassed)
Slotted Curb Spacers
Slotted Curbs Act
as a Level Spreader
Filter Strip
Directly Abuts
Pavement
• Storm Dram
Dripline o1 hoe Should
Not extend Over Trench
Trench
Removable
Protective Filter
Cloth Layer
Optional
Sand Filter
Figure 3.31 — Parking Lot Perimeter Trench Design
February 2005 Volume 111— Hydrologic Analysis and Flow Control BMPs
3-99
• Vegetation — The embankment, emergency spillways, spoil and
borrow areas, and other disturbed areas should be stabilized and
planted, preferably with grass, in accordance with Stormwater Site
Plan (See Minimum Requirement #1 of Volume I). Without healthy
vegetation the surface soil pores would quickly plug.
Maintenance Criteria for Basins
• Maintain basin floor and side slopes to promote dense turf with
extensive root growth. This enhances infiltration, prevents erosion and
consequent sedimentation of the basin floor, and prevents invasive
weed growth. Bare spots are to be immediately stabilized and
revegetated.
• Vegetation growth should not be allowed to exceed 18 inches in
height. Mow the slopes periodically and check for clogging, and
erosion.
• Seed mixtures should be the same as those recommended in Table 3.2.
The use of slow-growing, stoloniferous grasses will permit long
intervals between mowing. Mowing twice a year is generally
satisfactory. Fertilizers should be applied only as necessary and in
limited amounts to avoid contributing to ground water pollution.
Consult the local extension agency for appropriate fertilizer types,
including slow release fertilizers, and application rates.
3.3.11 Infiltration Trenches
This section covers design, construction, and maintenance criteria specific
for infiltration trenches.
Description:
Infiltration trenches are generally at least 24 inches wide, and are
backfilled with a coarse stone aggregate, allowing for temporary storage
of storrnwater nrnoff in the voids of the aggregate material. Stored runoff
then gradually infiltrates into the surrounding soil. The surface of the
trench can be covered with grating and/or consist of stone, gabion, sand,
or a grassed covered area with a surface inlet. Perforated rigid pipe of at
least 8 -inch diameter can also be used to distribute the stormwater in a
stone trench.
See Figures 3.30 for schematic of an infiltration trench. See Figures 3.31,
3.32, 3.33, 3.34, and 3.35 for examples of trench designs.
3-98 Volume 11! - Hydrologic Analysis and Flow Control BMPs February 2005
For more detailed information on maintenance, see Volume V, Section 4.6
— Maintenance Standards for Drainage Facilities.
Verification of Performance
During the first 1-2 years of operation verification testing (specified in
SSC -9) is strongly recommended, along with a maintenance program that
results in achieving expected performance levels. Operating and
maintaining ground water monitoring wells (specified in Section 3.3.7 -
Site Suitability Criteria) is also strongly encouraged.
3.3.10 infiltration Basins
This section covers design and maintenance criteria specific for infiltration
basins. (See schematic in Figure 3.25)
Description:
Infiltration basins are earthen impoundments used for the collection,
temporary storage and infiltration of incoming stormwater runoff.
Design Criteria Specific for Basins
• Access should be provided for vehicles to easily maintain the forebay
(presettling basin) area and not disturb vegetation, or resuspend
sediment any more than is absolutely necessary.
• The slope of the basin bottom should not exceed 3% in any direction.
• A minimum of one foot of freeboard is recommended when
establishing the design ponded water depth. Freeboard is measured
from the rim of the infiltration facility to the maximum ponding level
or from the rim down to the overflow point if overflow or a spillway is
included.
• Treatment infiltration basins must have sufficient vegetation
established on the basin floor and side slopes to prevent erosion and
sloughing and to provide additional pollutant removal. Erosion
protection of inflow points to the basin must also be provided (e.g.,
riprap, flow spreaders, energy dissipators (See Chapter 4)). Select
suitable vegetative materials for the basin floor and side slopes to be
stabilized. Refer to Chapter 0 for recommended vegetation.
• Lining material — Basins can be open or covered with a 6 to 12 -inch
layer of filter material such as coarse sand, or a suitable filter fabric to
help prevent the buildup of impervious deposits on the soil surface. A
nonwoven geotextile should be selected that will function sufficiently
without plugging (see geotextile specifications in Appendix V -C of
Volume V). The filter layer can be replaced or cleaned when/if it
becomes clogged.
February 2005 Volume 111— Hydrologic Analysis and Flow Control BMPs 3-97
--► —�tract/easement A 411-1inflow pipe , i I. lines as required
outf ow/
overflow
structure 4
PLAN VIEW
overflow/emergerr overftow
12'/15' If H 2 6'
16' if H < 6' 1 (tYP)
v �y. ,,. , V r+
\, i\ //ice /. — f a. /�:7 i%G�,%%/:%G%%\
/ 1 � :, ` 31 slope {typ) %i
..20‘• '' ',\''/' W ��%:V'i.�� i\ .. c. \moi: % >
existing ground
SECTION A -A
NOTE: NTS
Detail is a schematic representation only. Actual. configuration will vary
depending on specific site constraints and applicable design criteria. •
Figure 3.25 Typical Infiltration Pond/Basin
3-66 Volume 111— Hydrologic Analysis and Flow Control BMPs February 2005
3.3 Infiltration Facilities for Flow Control and for
Treatment
3.3.1 Purpose
To provide infiltration capacity for stormwater runoff quantity and flow
control, and for water quality treatment.
3.3.2 Description
An infiltration BMP is typically an open basin (pond), trench, or buried
perforated pipe used for distributing the stormwater runoff into the
underlying soil (See Figure 3.25). Stormwater dry -wells receiving
uncontaminated or properly treated stormwater can also be considered as
infiltration facilities. (See Underground Injection Control Program,
Chapter 173-218 WAC).
Coarser more permeable soils can be used for quantity control provided
that the stormwater discharge does not cause a violation of ground water
quality criteria. Typically, treatment for removal of TSS, oil, and/or
soluble pollutants is necessary prior to conveyance to an infiltration BMP.
Use of the soil for treatment purposes is also an option as long as it is
preceded by a pre -settling basin or a basic treatment BMP. This section
highlights design criteria that are applicable to infiltration facilities serving
a treatment function.
3.3.3 Applications
Infiltration facilities for flow control are used to convey storinwater runoff
from new development or redevelopment to the ground and ground water
after appropriate treatment. Infiltration facilities for treatment purposes
rely on the soil profile to provide treatment. In either case, runoff in excess
of the infiltration capacity of the facilities must be managed to comply
with the flow control requirement in Volume I, if flow control applies to
the project.
Infiltration facilities can help accomplish the following:
Ground water recharge
Discharge of uncontaminated or properly treated stormwater to dry -wells
in compliance with Ecology's UIC regulations (Chapter 173-218 WAC)
Retrofits in limited land areas: Infiltration trenches can be considered for
residential lots, commercial areas, parking lots, and open space areas.
Flood control
Streambank erosion control
February 2005 Volume 111— Hydrologic Analysis and Flow Control BMPs 3-65
Maintenance
Standards
• Sediment traps may not be feasible on utility projects due to the
limited work space or the short-term nature of the work. Portable
tanks may be used in place of sediment traps for utility projects.
• Sediment shall be removed from the trap when it reaches 1 -foot in
depth.
• Any damage to the pond embankments or slopes shall be repaired.
Surface area determined
at top of weir
d
f._......_ T Flat Bottom 11.5' Min.__... _.._.-
Note: Trap may be formed by berm or by
partial or complete excavation
4' Min.
—l_
1' Min. Overflow
1' Min.
RipRap
2"-4" Rock
Geotextile
;' - 1.5•.
washed gravel
Discharge to stabilized
conveyance, outlet, or
level spreader
Figure 4.22 Cross Section of Sediment Trap
Geotextile
1lf..�II==1{i.
I 1-: 1 117711 ! :._l l i_-11 I___i i 1.
1' depth
- I
LE 2"-4"' rock
•
1i7=1 Min. depth 3/4"-1.5"
1Il�IlI�:�� 1'
washed gravel
Figure 4.23 Sediment Trap Outlet
4-104 Volume 11— Construction Sformwater Pollution Prevention February 2005
CITY OF TUKWILA
Department of Community Development
6300 Southcenter Boulevard, Tukwila, WA 98188
Telephone: (206) 431-3670 FAX (206) 431-3665
E-mail: tukplan@ci.tukwila.wa.us
• SEPA
ENVIRONMENTAL
REVIEW
APPLICATION
NAME OF PROJECT/DEVELOPMENT:
LOCATION OF PROJECT/DEVELOPMENT: Give street address or, if vacant, indicate lot(s),
block and subdivision, access street, and nearest intersection.
10230 East Marginal Way South, Seattle, WA 98168
LIST ALL TAX LOT NUMBERS (this information may be found on your tax statement).
042304-9102, 042304-9062, 042304-9015
DEVELOPMENT COORDINATOR :
The individual who:
• has decision making authority on behalf of the owner/applicant in meetings with City staff,
• has full responsibility for identifying and satisfying all relevant and sometimes overlapping development
standards, and
• is the primary contact with the City to whom all notices and reports will be sent.
Name: Anthony Vincent
Address: 12201 Tukwila Int'1 Blvd, Fourth Floor
Phone: (206) 281-8700 FAX: (206) 282-9951
E-mail: anthon # sabe .com
Signature:
Date: ?A 0 / 0
C:\Documents and Settings\ DaleS\ Desktop\ SEPA Environmental Review Application -1u12010 (2).doc
FOR STAFF USE ONLY Permits Plus TYPE P-SEPA
Planner:
File Number: r , L, ._—
015'
Application Complete
(Date:
)
Project File Number:
T7 L / Cr ` C, ti -7
Application Incomplete
(Date:
)
Other File Numbers:
NAME OF PROJECT/DEVELOPMENT:
LOCATION OF PROJECT/DEVELOPMENT: Give street address or, if vacant, indicate lot(s),
block and subdivision, access street, and nearest intersection.
10230 East Marginal Way South, Seattle, WA 98168
LIST ALL TAX LOT NUMBERS (this information may be found on your tax statement).
042304-9102, 042304-9062, 042304-9015
DEVELOPMENT COORDINATOR :
The individual who:
• has decision making authority on behalf of the owner/applicant in meetings with City staff,
• has full responsibility for identifying and satisfying all relevant and sometimes overlapping development
standards, and
• is the primary contact with the City to whom all notices and reports will be sent.
Name: Anthony Vincent
Address: 12201 Tukwila Int'1 Blvd, Fourth Floor
Phone: (206) 281-8700 FAX: (206) 282-9951
E-mail: anthon # sabe .com
Signature:
Date: ?A 0 / 0
C:\Documents and Settings\ DaleS\ Desktop\ SEPA Environmental Review Application -1u12010 (2).doc
C11 Y Ui 146W1LA V)
Department of Comliffnity Development
6300 Southcenter Boulevard, Tukwila, WA 98188
Telephone: (206) 431-3670 FAX (206) 431-3665
E-mail: tukplan@ci.tukwila.wa.us
SEPA
ENVIRONMENTAL
REVIEVy. �..
INFORMATION
The State Environmental Policy Act (SEPA) requires all agencies to consider the environmental impacts of a
development before making decisions (43.21C RCW). The purpose of environmental review is to identify a
proposal's significant adverse impacts; measures to minimize or avoid such impacts; and allow wide public
review for a wide range of projects.
REQUIREMENTS: SEPA review is required for any action associated with the followin ltiye.ZIT
decisions:
1. Developing 10 or more dwelling units. CONNUEM
2. Developing agricultural structures overl0,000 s.f.��L°-i�f°�'yT
3. Developing office, school, commercial, recreational, service or storage buildings over 12,000 s.f. and 40
parking spaces (certain utility lines, personal wireless communication facilities, and normal
maintenance/replacement activities are fully exempt).
4. Developing parking lots with over 40 spaces.
5. Landfills and excavations over 500 cubic yards.
6. Installation of impervious underground tanks with a capacity over 10,000 gallons.
The accompanying application must be completed for any new SEPA application or request to issue an
addendum to any previous SEPA determination. If a question does not apply, "Does not apply" or "NA" may be
entered. Complete answers to the checklist may avoid unnecessary delays later. City staff may also be able to
help about governmental designations (e.g., zoning, shoreline, and landmark status).
PROCEDURES: At the time you submit your application you must have all of the items listed on the
attached "Complete Application Checklist" as well as the submittal for the underlying action (building permit,
subdivision etc.). You may request a waiver from items on the checklist that are not applicable to your project.
Please discuss this waiver request with City staff either at a pre -application meeting or at the time of application
submittal. Within 28 days of receiving your application, City staff will determine if it is complete based on the
attached checklist. If not complete City staff will mail you a letter outlining what additional information is
needed. If you do not submit requested materials within 90 days from the City's request for additional information the
City may cancel your application.
Once the application is "complete," substantive review will begin and a "Notice of Application" must be
posted/mailed to begin a public comment period. After completing the environmental analysis and considering
public comments, the Director will issue a determination for the project. A Determination of Non -Significance
(DNS) says that the project as proposed will not have probable, significant, negative environmental impacts. A
mitigated DNS will be issued if the project must be modified to mitigate its negative impacts. An
Environmental Impact Statement (EIS) must be prepared if the probable negative impacts are unavoidable.
C:\Documents and Settings\DaleS\Desktop\SEPA Environmental Review Application-Ju12010 (2).doc
IIIIMMWWVJUi1IN Irl UU YP'y- ' so •&W SL.•�At. 'iuw.
The materials listed below must be miffed with your application unless specifically waived in writing by the Public
Works Department and the Department of Community Development. Please contact each Department if you feel that
certain items are not applicable to your project and should be waived. Application review will not begin until it is
determined to be complete. ADDITIONAL MATERIALS MAY BE REQUIRED.
The initial application materials allow project review to begin and vest the applicant's rights. However, the City may
require additional information as needed to establish consistency with development standards.
City Staff are available to answer questions about application materials at 206-431-3670 (Department of Community
Development) and 206-433-0179 (Department of Public Works).
* Please note that the application fee listed in the land use fee schedule covers up to a
specified number of review hours and is due at the time an application is received by the
City. Review hours over the retainer fee will be charged at $92.00 per hour and the
applicant will receive a monthly bill when those fees become due.
Check items ;
submitted
with
application
Information Required.
May be waived inunusual cases, upon approval of both Public Works and Planning
APPLICATION MATERIALS:
1. Application Checklist (1 copy) indicating items submitted with application.
2. Completed ESA Screening Checklist, SEPA Environmental Checklist and drawings (5 copies).
3. One set of all plans reduced to 8 1/2" by 11" or 11" by 17".
4. Application Fee: See Land Use Fee Schedule for Standard App. Fee. * Add'l Fees May Incur
5. Underlying permit application that triggers SEPA review.
PUBLIC NOTICE MATERIALS:
6. Payment of a $365 notice board fee to FastSigns Tukwila or
Provide a 4' x 4' public notice board on site within 14 days of the Department determining that a complete
application has been received (see Public Notice Sign Specifications Handout).
7. Provide one hard copy of mailing labels for all property owners and tenants (residents or businesses) within
500 feet of the subject property. Each unit in multiple family buildings e.g. apartments, condos, trailer parks --
must be included.
Once you're project is assigned to a planner, you will be required to provide an excel spreadsheet of the mailing
labels in a useable format according to the Public Notice Mailing Label Handout. See Public Notice Mailing
Label Handout for sample of the required format.
If providing own labels, include King County Assessor's map(s) which shows the location of each property
within 500 ft. of the subject lot.
8. Or you may pay the City to generate the mailing labels.
Mailing Fee: Prior to issuing permit, the mailing fee shall be paid according to the Land Use Fee Schedule
for Public Notice Mailing Fee.
PROJECT DESCRIPTION AND ANALYSIS:
9. Vicinity Map with site location.
10. Provide four (4) copies of any sensitive area studies such as wetland or geotechnical reports if needed per
Tukwila's Sensitive Areas Ordinance (TMC 18.45). See the Geotechnical Report Guidelines and Sensitive
Area Special Study Guidelines (online www.ci.tukwila.wa.us/dcd/dcdplan.htm) for additional information.
11. Any drawings needed to describe the proposal other than those submitted with the underlying permit.
Maximum size 24" x 36".
C:\Documents and Settings\DaleS\Desktop\SEPA Environmental Review Application-Ju12010 (2).doc
City of Tukwila
Endangered Species Act Screening Checklist
Date: 9/2/10
Applicant Name: 10230 East Marginal LLC
Street Address: 10230 East Marginal Way South
City, State, Zip: Seattle, WA 98168
Telephone: (206) 281-8700
Directions
This Screening Checklist has been designed to evaluate the potential for your project to
result in potential "take" of Chinook salmon, Coho salmon, or Cutthroat trout as defined by
Section 9 of the Endangered Species Act. The checklist includes a series of "Yes" or "No"
questions about your project, organized into four parts. Starting with Part A on Page 1, read
each question carefully, circle "Yes" or "No," and proceed to the next question as directed
by the checklist. To answer these questions, you may need to refer to site plans, grading
and drainage plans, critical areas studies, or other documents you have prepared for your
project. The City will evaluate your responses to determine if "take" is indicated.
C:\Documents and Settings\DaleS\Desktop\SEPA Environmental Review Application-Ju12010 (2).doc
Part A: Please review and answer each question carefully. Consider alnases of your project
including, but not limited to, construction, normal operation, potential emergency operation, and
ongoing and scheduled maintenance. Continue to the next question as directed for each No or Yes
answer. -
1-0
Will the project require any form of grading? Grading is defined as any excavating, filling,
clearing, or creation of impervious surface, or any combination thereof, which alters the
existing ground surface of the earth (TMC 18.06.370). Please circle appropriate response.
NO - Continue to Question 2-0
YES - Continue to Question 1-1 (Page 3)
2-0
Will the project require any form of clearing? Clearing means the removal or causing to be
removed, through either direct or indirect actions, any vegetation from a site (18.06.145).
Please circle appropriate response.
NO - Continue to Question 3-0
YES - Continue to Question 2-1 (Page 4)
3-0
Will the project require work, during any time of the project, below the ordinary high water
mark of a watercourse or the Green/Duwamish or Black Rivers or in wetlands? Ordinary high
water mark is the mark that is found by examining the bed and banks of a stream and
ascertaining where the presence and action of waters are so common and usual as to distinctly
mark the soil from that of the abutting upland, in respect to vegetation (see TMC Chapter
18.06, Page 18-15). Please circle appropriate response.
NO - Continue to Question 4-0
YES - Continue to Question 3-1 (Page 5)
4-0
Will the project result in the processing or handling, storage, or treatment of hazardous
substances? This does not include the proper use of fuel stored in a vehicle's fuel tank.
Hazardous substances are any liquid, solid, gas, or sludge, including any material, substance,
product, commodity, or waste, regardless of quantity, that exhibits the characteristics or criteria
of hazardous waste as defined by Washington Administrative Code 173-303 (TMC 18.06.385).
This includes fuel or other chemicals stored on-site during construction. Please circle
appropriate response.
NO - Continue to Question 5-0
YES - Continue to Question 5-0
5-0
Will the project result in the withdrawal, injection, or interception of groundwater? Examples
of projects that may affect groundwater include, but are not limited to: construction of a new
well, change in water withdrawals from an existing well, projects involving prolonged
construction dewatering, projects installing French drains or interceptor trenches, and sewer
lines. For the purpose of this analysis, projects that require a geotechnical report pursuant to
the requirements of TMC 18.45.060 or would require a geotechnical report if not exempt
should answer Yes. Please circle appropriate response.
NO - Continue to Question 6-0
YES - Continue to Question 6-0
C:\Documents and Settings\Da1eS\Desktop \SEPA Environmental Review Application-Ju12010 (2).doc
Part A (continued)
6-0 Will the project involve landscaping or re -occurring outdoor maintenance that includes the
regular use of fertilizers, pesticides, or herbicides? This does not include the one-time use of
transplant fertilizers. Landscaping means natural vegetation such as trees, shrubs,, _ --
groundcover, and other landscape materials arranged in a manner to produce an aesthetic effect
appropriate for the use of the land (TMC 18.06.490). For the purpose of this analysis, this
includes the establishment of new lawn or grass. Please circle appropriate response.
NO — Checklist Complete
YES — Checklist Complete
Part B: Please answer each question below for projects that include grading. Review each
question carefully, considering all phases of your project including, but not limited to
construction, normal operation, potential emergency operation, and ongoing and scheduled
maintenance. Continue to the next question as directed for each No or Yes answer.
1-1
Will the project involve the modification of a watercourse bank or bank of the
Green/Duwamish or Black Rivers between the ordinary high water mark and top of bank? This
includes any projects that will require grading on any slope leading to a river or stream, but
will not require work below the ordinary high water mark. Work below the ordinary high
water mark is covered in Part C. Please circle appropriate response.
NO - Continue to Question 1-2
YES - Continue to Question 1-2
1-2 Could the construction, operation, or maintenance of the project result in sediment transport off
site or increased rates of erosion and/or sedimentation in watercourses, the Green/Duwamish
rivers, or the Black River? Most projects that involve grading have the potential to result in
increased erosion and/or sedimentation as a result of disturbances to the soil or earth. If your
project involves grading and you have not prepared a Temporary Erosion and Sedimentation
Control Plan specifically designed to retain 100 percent of the runoff (including during
construction) from impervious surface or disturbed soils, answer Yes to this question. If your
project is normally exempt under the Tukwila Municipal Code and would not require the
preparation of a Temporary Erosion and Sedimentation Control Plan, BUT may still result in
erosion or sediment transport off site or beyond the work area, answer Yes to this question.
Please circle appropriate response.
NO - Continue to Question 1-3
YES - Continue to Question 1-3
1-3 Will the project result in the construction of new impervious surfaces? Impervious surfaces
include those hard surfaces which prevent or restrict the entry of water into the soil in the
manner that such water entered the soils under natural conditions prior to development; or a
hard surface area that causes water to run off the surface in greater quantity or at an increased
rate of flow from the flow presented under natural conditions prior to development. Such areas
include, but are not limited to, rooftops, asphalt or concrete paving, compacted surfaces, or
other surfaces that similarly affect the natural infiltration or runoff patterns existing prior to
development (TMC 18.06.445). Please circle appropriate response.
NO - Continue to Question 2-0 (Page 2)
YES - Continue to Question 1-4
City of Tukwila ESA Screening Checklist
Part B (continued)
1-4 Will your project generate stormwater from the creation of impervious surfaces that will not be
infiltrated on site? For the purpose .of this. analysis, infiltration includes the use of a
stormwater treatment and management system intended to contain all stormwater on site by
allowing it to seep into pervious surface or through other means to be introduced into the
ground. If your project involves the construction of impervious surface and does not include
the design of a stormwater management system specifically designed to infiltrate stormwater,
answer Yes to this question. Please circle appropriate response.
NO - Continue to Question 2-0 (Page 2)
YES - Continue to Question 2-0 (Page 2)
Part C: Please review each question below for projects that include clearing. Review each
question carefully, considering all phases of your project including, but not limited to
construction, normal operation, potential emergency operation, and ongoing and scheduled
maintenance. Continue to the next question as directed for each No or Yes answer.
2-1
Will the project involve clearing within 200 feet of the ordinary high water mark of a
watercourse or the Green/Duwamish or Black Rivers? Please circle appropriate response.
NO - Continue to Question 3-0 (Page 2)
YES - Continue to Question 2-2
2-2
Will the project involve clearing of any trees within 200 feet of the ordinary high water mark
of a watercourse or the Green/Duwamish or Black Rivers? A tree is defined by TMC
18.06.845 as any self-supporting woody plant, characterized by one main trunk, with a
potential diameter -breast -height of 2 inches or more and potential minimum height of 10 feet.
Please circle appropriate response.
NO - Continue to Question 2-3
YES - Continue to Question 2-3
2-3
Will the project involve clearing of any evergreen trees from within 200 feet of the ordinary
high water mark of a watercourse or the Green/Duwamish or Black Rivers? For the purpose of
this analysis evergreen means any tree that does not regularly lose all its leaves or needles in
the fall. Please circle appropriate response.
NO - Continue to Question 2-4
YES - Continue to Question 2-4
2-4
Will the project involve clearing within 100 feet of the ordinary high water mark of a
watercourse or the Green/Duwamish or Black Rivers? Please circle appropriate response.
NO - Continue to Question 3-0 (Page 1)
YES - Continue to Question 2-5
2-5
Will the project involve clearing within 40 feet of the ordinary high water mark of a
watercourse or the Green/Duwamish or Black Rivers? Please circle appropriate response.
NO - Continue to Question 3-0 (Page 2)
YES - Continue to Question 3-0 (Page 2)
Part D: Please review eaestion below for projects that includork below the ordinary high
water mark of watercourses or the Duwamish/Green or Black Rivers or in wetlands. Review each
question carefully, considering all phases of your project including, but not limited to,
construction, normal operation, potential emergency operation, and ongoing and scheduled
maintenance. Continue to the next question as directed for each No or Yes answer.
3-1
Will the project involve the direct alteration of the channel or bed of a watercourse, the
Green/Duwamish rivers, or Black River? For the purpose of this analysis, channel means the
area between the ordinary high water mark of both banks of a stream, and bed means the
stream bottom substrates, typically within the normal wetted -width of a stream. This includes
both temporary and permanent modifications. Please circle appropriate response.
NO - Continue to Question 3-2
YES - Continue to Question 3-2
3-2
Will the project involve any physical alteration to a watercourse or wetland connected to the
Green/Duwamish River? For the purpose of this analysis, "connected to the river means"
flowing into via a surface connection or culvert, or having other physical characteristics that
allow for access by salmonids. This includes impacts to areas such as sloughs, side channels,
remnant oxbows, ditches formed from channelized portions of natural watercourses or any area
that may provide off channel rearing habitat for juvenile fish from the Duwamish River. This
includes both temporary construction alterations and permanent modifications. Watercourses
or wetlands draining to the Green/Duwamish River that have a hanging culvert, culvert with a
flap gate, diversion, or any entirely man-made or artificial structure that precludes fish access
should answer Yes to this question. Please circle appropriate response.
NO - Continue to Question 3-3
YES - Continue to Question 3-3
3-3
Will the project result in the construction of a new structure or hydraulic condition that could
be a barrier to salmonid passage within the watercourse or the Green/Duwamish or Black
Rivers? For the purpose of this analysis, a barrier means any artificial or human modified
structure or hydraulic condition that inhibits the natural upstream or downstream movement of
salmonids, including both juveniles and adults. Please circle appropriate response.
NO - Continue to Question 3-4
YES - Continue to Question 3-4
3-4
Will the project involve a temporary or permanent change in the cross-sectional area of a
watercourse or the Green/Duwamish or Black Rivers? For the purpose of this analysis, the
cross-sectional area is defined as a profile taken from the ordinary high water mark on the right
bank to the ordinary high water mark on the left bank. Please circle appropriate response.
NO - Continue to Question 3-5
YES - Continue to Question 3-5
3-5
Will the project require the removal of debris from within the ordinary high water mark of a
watercourse or the Green/Duwamish or Black Rivers? For the purpose of this analysis, debris
includes, but is not limited to fallen trees, logs, shrubs, rocks, piles, rip -rap, submerged metal,
and broken concrete or other building materials. Projects that would require debris removal
from a watercourse or the Green/Duwamish or Black Rivers as part of a maintenance activity
should answer Yes to this question. Please circle appropriate response.
NO - Continue to Question 3-6
YES - Continue to Question 3-6
City of Tukwila ESA Screening Checklist
3-6 Will the project result in impacts to watercourses or wetlands thal� lave a surface connection to
another watercourse or the Green/Duwamish or Black Rivers but do not contain habitat
conditions that support salmonid use? Such areas may include, but_not be limited to hillside
seeps and wetlands isolated from the watercourse or river that have -a -surface water connection
to the watercourse or river but are not assessable, nor would be assessable to salmonids under
natural conditions. Wetlands with a "functions and values" rating for baseflow/groundwater
support of 9 and above (or moderate) as described in Cooke (1996) should be included. Please
circle appropriate response.
NO - Continue to Question 3-7
YES - Continue to Question 3-7
3-7 Will the project include the construction of artificial waterways or wetlands connected to a
watercourse containing salmonids? For the purpose of this analysis, the construction of
artificial waterways or wetlands includes wetlands, channels, sloughs, or other habitat feature
created to enhance wildlife use, particularly waterfowl use, or may be attractive to wildlife,
particularly waterfowl. Please circle appropriate response.
NO - Continue to Question 3-8
YES - Continue to Question 3-8
3-8 Will the project include bank stabilization? For the purpose of this analysis, bank stabilization
includes, but is not limited to, rip -rap, rock, log, soil, or vegetated revetments, concrete
structures, or similar structures. Please circle appropriate response.
NO - Continue to Question 4-0 (Page 2)
YES - Continue to Question 4-0 (Page 2)
STATE ENVIRONMENTAL CHECKLIST
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
A. BACKGROUND
1. Name of proposed project, if applicable:
2. Name of Applicant:
10230 East Marginal L.L.0
3. Date checklist prepared:
September 3, 2010
4. Agency requesting checklist:
City of Tukwila
5. Proposed timing or schedule (including phasing, if applicable):
Project is prosoed to begin on September 13t. The project will last approx.
2 months.
6. Do you have any plans for future additions, expansion, or further activity
related to or connected with this proposal? If yes, explain.
No.
Agency Comments
to Oa
ON. kolA
7. List any environmental information you know about that has been
prepared, or will be prepared, directly related to this proposal.
No.
8. Do you know whether applications are pending for governmental approvals of other
proposals directly affecting the property covered by your proposal? If yes, explain.
Grading Permit, Haul Permit, SWPPP
C:\Documents and Settings\DaleS\Desktop\SEPA Environmental Review Application-Ju12010 (2).doc
Please respond to all questions. Use separate sheets as necessary.
- Applicant Responses: Agency Comments
Q keic,"%co,
10. Give brief, complete description of your proposal, including the proposed uses and the size
of the project and site. There are several questions later in this checklist that ask you to
describe certain aspects of your proposal. You do not need to repeat those answers on this
page.
Fill dirt is being imported to site to raise the grade. The site is 6.8 acres (approx. 3.5 Acres
in the city of Seattle and 3.3 acres in the city of Tukwila)
9. List any government approvals or permits that will be needed for your proposal.
Grading Permit, Haul Permit, SWPPP
11. 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, the tax lot
number, and section, township, and range. 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.
A portion of the NW '/4 of Section 3 and Gov. Lot 8 of Sec: 4 TWP. 23 N, RGE 4 E, W.M.
King County, State of Washington.
Tax Parcel #: 042304-9102, 042304-9062. 042304-9015
12. Does the proposal lie within an area designated on the City's Comprehensive Land Use
Policy Plan Map as environmentally sensitive?
No.
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
B. ENVIRONMENTAL ELEMENTS
1. Earth
a. General description of the site (circle one): Flat, rolling, hilly, steep slopes,
mountainous, other: This site is generally flat.
b. What is the steepest slope on the site (approximate percent slope)?
Approximately 5% in some small areas.
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.
Soil types are generally a top loose to medium dense alluvial sand and a soft layer of
estuarine silt. Both are varing thickness over the site.
d. Are there surface indications or history of unstable soils in the immediate vicinity?
If so, describe.
No.
e. Describe the purpose, type, and approximate quantities of any filling or grading
proposed. Indicate source of fill.
Fill dirt is being imported to raise the grade of the site. Approx. 40,000 yards will be
imported from the U -link project on Capital Hill (Broadway & E. Denny St.)
Agency Comments
•
Please respond to all questions. Use separate sheets as necessary.
Applicant Respses:
f. Could erosion occur as a result of clearing, construction, or use?
If so, generally describe.
g•
The site is at a lower elevations than the surrounding areas. It has been dormant for
approximately 2 years and storm water has been infiltrating. Track -out from trucking will
be managed.
About what percent of the site will be covered with impervious surfaces after project
construction (for example, asphalt or buildings)?
0%
h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any:
A T.E.S.0 plan will be created and implemented.
2. Air
a. What types of emissions to the air would result from the proposal (for example, dust,
automobile odors, industrial wood smoke) during construction and when the project is
completed? If any, generally describe and give approximate quantities if known.
Dust/Dirt Particles
b. Are there any off-site sources of emissions or odor that may affect your proposal? If so,
generally describe.
No.
Agency Comments
'\6\
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
c. Proposed measures to reduce or control emissions or other impacts to air, if any:
Street sweeper and water trucks will be used during the process.
3. Water
a. Surface:
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.
No, this site is outside the 200 foot line of the Duwamish.
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.
No.
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.
None.
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
4. Will the proposal require surface water withdrawals or diversions? Give general
description, purpose, and approximate quantities, if known.
No.
5. Does the proposal lie within a 100 -year floodplain? If so, note location on the site plan.
No.
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.
No.
b. Ground:
1. Will ground water be withdrawn, or will water be discharged to ground water? Give
general description, purpose, and approximate quantities, if known.
No.
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
2. Describe waste materials 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:
None.
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? Will this water flow into other waters? If so, describe.
The site currently infiltrates. As fill is introduced to the site, temporary collection areas
will be utilized until final grading is achieved. The site will be left at grades that will allow
for continued infiltration with no storm water leaving the site.
2. Could waste materials enter ground or surface waters? If so, generally describe.
Preliminary testing from the export site has revealed no contaminates or waste. The
material is also being monitored as it leaves the site. The exposure to waste would be
limited to grading equipment used during the placement.
d. Proposed measures to reduce or control surface, ground, and runoff water impacts, if any:
Temporary storage/infiltration areas will be utilized during fill operations. Low elevations
relative to surrounding areas will preclude any water from leaving the site.
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
4. Plants
a. Check or circle types of vegetation found on the site:
b. What kind and amount of vegetation will be removed or altered?
None.
c. List threatened or endangered species known to be on or near the site.
None.
d. Proposed landscaping, use of native plants, or other measures to preserve or enhance
vegetation on the site, if any:
None
Deciduous tree: alder, maple, aspen, other
Evergreen tree: fir, cedar, pine, other
Shrubs
Grass
Pasture
Crop or grain
Wet soil plants: cattail, buttercup, bulrush,
skunk cabbage, other
Water plants: water lily, eelgrass, milfoil, other
X
Other types of vegetation — Urban Landscaping
b. What kind and amount of vegetation will be removed or altered?
None.
c. List threatened or endangered species known to be on or near the site.
None.
d. Proposed landscaping, use of native plants, or other measures to preserve or enhance
vegetation on the site, if any:
None
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:. _ _ Agency Comments
5. Animals
a. Circle any birds or animals which have been observed on or near the site or are
known to be on or near the site:
Birds:
Hawk, heron, eagle, songbirds, other:
Mammals
Deer, bear, elk, beaver, other:
Fish
Bass, salmon, trout, herring, shellfish, other:
Other
None known. This is a highly developed urban site. Species tolerant of intensive
urban development may be present on site.
b. List any threatened or endangered species known to be on or near the site.
None.
c. Is the site part of a migration route? If so, explain.
No.
d. Proposed measures to preserve or enhance wildlife, if any:
None.
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.
N/A
�Please respond to �questions. Use separate sheets as neces
ary.
Applicant Responses: Agency Comments
b. Would your project affect the potential use of solar energy by adjacent properties? If
so, generally describe.
No.
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:
N/A
7. Environmental Health
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.
No.
1. Describe special emergency services that might be required.
None.
2. Proposed measures to reduce or control environmental health hazards, if any:
N/A
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
b. Noise
1. What types of noise exist in the area which may affect your project (for example:
traffic, equipment, operation, other)?
Traffic noise from I-5 and adjacent surface streets and air traffic noise from Boeing
field.
2. What types and levels of noise would be created by or associated with the
project on a short-term or long-term basis (for example: traffic, construction,
operation, other)? Indicate what hours noise would come from the site.
Short term noise will be created from construction equipment. The hours of
construction will be from 7 a.m.- 4 ..m. M -F. The . ect duration is ex.ected to
ro
be approximately 8 weeks.
3. Proposed measures to reduce or control noise impacts, if any:
None.
Agency Comments
8. Land and Shoreline Use
a. What is the current use of the site and adjacent properties?
The current use of the site is warehouse and distribution. Boeing and Boeing field
are located to the north, I-5 to the east, and light industrial uses are to the south and
Marginal way to the west.
b. Has the site been used for agriculture? If so, describe.
No.
e respond to uestions. Use separate sheets as necessary.
Pleasp q p
Applicant Responses: Agency Comments
c. Describe any structures on the site.
None.
d. Will any structures be demolished? If so, what?
No.
e. What is the current zoning classification of the site?
LI - Tukwila
IC - Seattle
f. What is the current comprehensive plan designation of the site?
The comprehensive plan designation of the portion of the site in Tukwila is light
industrial (LI).
g. If applicable, what is the current shoreline master program designation of the site?
N/A
h. Has any part of the site been classified as an "environmentally sensitive" area? If so,
specify.
No.
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
i. Approximately how many people would reside or work in the completed project?
J•
None N/A
Approximately how many people would the completed project displace?
None.
k. Proposed measures to avoid or reduce displacement impacts, if any:
None.
1. Proposed measures to ensure the proposal is compatible with existing and projected
land uses and plans, if any:
This application does not include any uses.
9. Housing
a. Approximately how many units would be provided, if any? Indicate whether high,
middle, or low-income housing?
None.
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
b. Approximately how many units, if any, would be eliminated? Indicate whether high,
middle, or low-income housing.
None
c. Proposed measures to reduce or control housing impacts, if any:
. None.
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?
N/A No structures being proposed
b. What views in the immediate vicinity would be altered or obstructed?
N/A No structures being proposed
c. Proposed measures to reduce or control aesthetic impacts, if any:
N/A No structures being proposed
•
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
11. Light and Glare
a. What type of light or glare will the proposal produce? What time of day would it
mainly occur?
None.
Agency Comments
b. Could light or glare from the finished project be a safety hazard or interfere with
views?
No
c. What existing off-site sources of light or glare may affect your proposal?
None
d. Proposed measures to reduce or control light and glare impacts, if any:
None.
12. Recreation
a. What designed and informal recreational opportunities are in the immediate
vicinity?
The Museum of Flight is located to the north of the property.
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
b. Would the proposed project displace any existing recreational uses? If so, describe.
No.
c. Proposed measures to reduce or control impacts on recreation, including recreation
opportunities to be provided by the project or applicant, if any:
None.
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. J)V
— 01101
b. Generally describe any landmarks or evidence of historic, archaeological, scientific,
or cultural importance known to be on or next to the site.
None Known
c. Proposed measures to reduce or control impacts, if any:
None.
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
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.
The property is served by I-5, the Boeing Access Road., East Marginal Way South.,
Airport Way South and South Norfolk Street.
b. Is the site currently served by public transit? If not, what is the approximate distance
to the nearest transit stop?
The nearest transit stop is located adjacent to the west boundary of the property on
East Marginal Way.
c. How many parking spaces would the completed project have? How many would the
project eliminate?
None.
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).
No.
e. Will the project use (or occur in the immediate vicinity of) water, rail, or air
transportation? If so, generally describe.
No.
Agency Comments
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comment
f. How many vehicular trips per day would be generated by the completed project? If
known, indicate when peak volumes would occur.
N/A.
g. Proposed measures to reduce or control transportation impacts, if any:
None.
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.
No.
b. Proposed measures to reduce or control direct impacts on public services, if any.
None.
16. Utilities
a. Circle utilities currently available at the site:
electricity, natural Ras, water, refuse service, telephone, sanitary sewer, septic
system
other:
•
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
b. 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.
None.
C. SIGNATURE
The above answers are true and complete to the best of my knowledge. I understand that the
lead agency is relying on them to make its decision.
Signatur- l: :-,}
Date Submitted:
(NON -PROJECT PROPOSALS (E.G., SUBURBAN PLANS AND
ZONING CODE TEXT CHANGES) MUST COMPLETE THE
FOLLOWING PAGES).
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: ___ _ Agency Comments
D. SUPPLEMENTAL SHEET FOR NON -PROJECT PROPOSALS
(do not use this sheet for project actions)
Because these questions are very general, it may be helpful to read them in
conjunction with the list of 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.
1. How would the proposals be likely to increase discharge to water; emissions
to air; production, storage, or release of toxic or hazardous substances; or
production of noise?
It is unlikely that this proposal will increase any of the elements listed: discharge to water,
emissions to air, release of hazardous substances or production of noise.
Proposed measures to avoid or reduce such increases are:
Temporary storage/infililtration areas will be utilized to preclude water from leaving the
site.
2. How would the proposal be likely to affect plants, animals, fish, or marine
life?
No affect anticipated.
Proposed measures to protect or conserve plants, animals, fish, or marine life
are:
None requried
1111
Please respond togbquestions. Use separate sheets as necessary.
Applicant Responses:
3. How would the proposal be likely to deplete energy or natural resources?
No depletion of energy or natural resources anticipated.
Proposed measures to protect or conserve energy and natural resources are:
None required
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 habitats, historic or cultural sites, wetlands, floodplains, or
prime farmlands?
No affect to environmentally sensitive areas or areas designated for
governmental protection anticipated
Proposed measures to protect such resources or to avoid or reduce impacts are:
None required
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 affect to shoreline uses anticipated
Agency Comments
1
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
Proposed measures to avoid or reduce shoreline and land use impacts are:
None required
6. How would the proposal be likely to increase demands on transportation or
public service and utilities?
This proposal will not increase demands to transportaion or public services and
utilities
Proposed measures to reduce or respond to such demand(s) are:
None required
7. Identify, if possible, whether the proposal may conflict with Local, State, or
Federal laws or requirements for the protection of the environment.
No known conflicts with Local, State or Federal laws protecting the
environment.
Agency Comments
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GENERAL NOTES
1. LCCATIONS MOM FOR FASTING UTRIVES ARE APPROXIMATE
2. AT LEAST 48 HOURS =ORE surnmo PROECT STE NAL NOWT THE UTUTIES
INSPECTCR AT 206-433-0179.
2. RECUEST A P0SJC YOMS UTILITY !APEMEN AT LEAST 24 HO= IN ADVANCE BY
CAW/10 206-433-0179.
4. THE CONTRACT= AMINES SOX RESPCOSERLITY FOR WATER SAFETY, AND DAMAGE 10
STRUCTURES AND IMPROMIENTS RESULTNG FROM COISTRUCTION MAACK&
5. DE CONTRACTOR SHALL HAVE THE PERIADS) AND CONCTITOIS. THE APPROIED pupa AND
A
0)00411 501 OF OTT CF AMU CEVELOPMCIT OACIEUXES APO DESCH IND
CCOSTRUCTICO STANDARDS AVAILABLE AT THE JC6 STE
2 ALL 50 SHALL CCOROM TO THESE APPROVED DRAMS. ANY MANGO FROM THE
APPROVED PUNS REWIRE PRE -APPROVAL FRC& TIE OMER DIE ENGINEER. AND TKE CITY
CF TUICINA.
7. ALL MTH= AND MATERIALS SHALL MEET 0111 01 TUKWILA DEVELORIENT GUIDELINES AND
DE904 APO cawnwocti STANDARDS MIES OTHERWISE APPROVED BY THE PUBJC
WORKS CIRECTOR
0. COITRACTOR MAU. RATAN A CUARENT SET OF COMINGS CR SITE
9. CCOMACTOR SHAU. PROVIDE RECCRD COMINGS PRIOR 10 PROEM FINAL APPROVAL_
PROWS TRAFFIC COMM AND STREET MAINTENANCE PLAN FOR PUBLIC WOKS APPROVAL.
BERRE IMPLEIENTATTIR.
11. ALL SURVEYING FCR PURR FACILMES MAIL BE DOE LINER THE DIRECTOR CF A
WASHINGTON UCIDISED LAND MAME VERTICAL DATUM SKAU. BE MUD 1088.
HORIZOITAL DATA SMALL BE BASINGER STATE (GRO) CCCODINATES, &MTH ZOE.
USING NAD 83-81 9180011 00(150. 1044 )1110 10 ANY TWO CITY OF TUICIALA HORIZONTAL
004150. WRIATENTS. FCR PROJECTS MDR A ROM =ORM ENE. THE MOAT=
SHAU. ARMEE CONVERSOL cAtaunces TO 14551 1929.
12. REPLACE OR RELGCATE ALL SGTIS DAMAGED CR REMOVED OLE 10 CONSTRUCTION.
11 RETRO REPLACE CR RESTORE COSTING VEGETATION IN RIGHTS-CF-WAT EASEMENTS. AND
ACCESS TRAMS
GENERAL CONSTRUCTION NOTES
1. ALL 50 PERMED SHAU. BE PER APPROVED PLANS AND SPECIFICADONS 960. ME
MATTE 5 RECURED TO RARITAN A 200 01 APPROVED PLANS. SPECIFICATIONS. AND
ASSOCIATED PERRIS ON 160 X13 STE WORK SIAJJ. BE PERMED 94 AMOR:LANCE 041)4
AU. FEDERAL STATE AND LOCAL LASS. PERMITTEE SHALL APPLY FOR A REVISOR FCR
ANT DM NOT AMMO= TO DE APPROVED PUNS.
0. PERMITTEE/CONTRACTCO SHALL ARRANGE A PREONSTRUCTICO CONFERENCE ION DE
OTYS DEPECTOES) 50 TO 150•05 AMY AMC
1 WOW PI ROADWAYS
44. ALL MORK RI ROADWAYS SHALL MEET TIC 11 440 1911 FOLLOWING
B. PROT TO ANY ACTIVITY IN OTT RIGIIT-CF-WAY. DIE PERMITTEE SHALL PROVIDE THE
CITY A TRAFFIC CONTROL FUN FOR REVIEW AND APPROVAL TIE MANIC CONTROL
RAN SHALL NM= DE LOCADOI. NORMS AND CESCRIPPOI Cf TRAFFIC FLOW
DURING THE WORX MIll SHALL 15E1 WITCO RECUIRENENTS
C ALL 501 REQUIRING LANE CLOSURES MUST BE 01 P428440 10410. 44904 1)411 DAD
THURSDAY IN NITOMER 10 THE MOORING JANUARY VW. THE DIRE= DOES NOT
441.1094 14411 CLOSURES IN DE TUKWILA URBAN CENTER
D. RE. REESMAN. AND VEHICULAR ACOZSS TO BALDRICS SHALL BE MAINTAINED AT ALL
CIES. EXCEPT WHEN POSIMEE HAS PONES= 44820 41)40 EVADING MIA AND THE
ORECTOR TO CLOSE MI ACCESS
E ALL ROADWATS HALL TE KEPT FREE OF (ART MO DEBTS USNG STREET scoots
USE 01 WATER TRUCKS MR CLEM= ROADWATS REQUIRES PREAPPROVAL FROI DIE
=ECM
F. INSTALL STEEL PLATES ORR ANY TRENOL AT NCI INE 50 5 STCPPED *10 1)40
09404 6 (151 0404.
GRADING AND EROSION CONTROL NOTES
1. ME EROSOI PREAMON AXD SCOW CONTROL (ESC) MEARES ON THE APPROVED
PUNS ARE MINIMUM EMMET=
2. BEFORE EMPORIA ANY CONSTRIICTEN ACTIVITIES. ESTAEUSH THE WANG MITS. INSTALL
CONSTRUCTION ENTRANCE. IND PISTM1 EROSON PREVENTION AND SEDIMENT COMM
MEASURES
1 BEITACE ANY COMM DISTURBANCE °COLA. ALL COVINSTREIM EROSON PREVENTION Ale
SENDIT CONTROL MEASURES (000) 11100 BE CCATRUCTED AND IN OPERATOR INSTALL
AND ININTAIN AU. ESC MEASURES ACCGODING TO THE ESC RAIL
4. ESC MEASURES. INCLUDING ALL PC012110 508 )820.5. SHALL REMAIN IN PUCE UNTL FINAL
STE CONSTRUCTER 6 COMREIED ARO PERMANENT STABUZATTOM IS (STABUSED.
5 FRCM MAY 1 THRUM EPTEMBER 30. PROVIE 10004*1T A10 P941444040 00908
BEASURES TO PROTECT DISTURBED AREAS THAT NIL REMAIN UTOORKED FOR SEVEN DAYS
25 4450
6. 1804 1012508 1 1)400.804*4406. SIL PRONE TOPCOAT& AND P944444040 0000
MEASURES TO PRona AMR= AREAS THAT VA. ROOM (8450011 FOR 100 DAYS OR
*COE 01 /GOMM TO COVER MEASURES. THE COITRACER SHAW
A PROTECT STOCKPILES AND STEEP CUTE AND FILL SUPES 40 18450400 FOR LIME THAN
12 HOURS.
B. STOCKPILE. ON SITE 0420104 CO= MATERIALS TO COVER ILL CISTUREED AREAS
C. BY CCM= 2 SEM ALL AREAS THAT TILL REMAIN MARKED OWING THE YET
SEASON (CCTOBER 1 THROUGH APRIL 30). 111201 AIL WED MEAS.
7. FAURE 10 MATADI ESC YEASURES 04 **N� 141H THE APPRITED MAINTENANCE
SOLECULE MAY RESULT 24 THE WORX BENG PERFCR1ED AT THE 50C11014 Cr THE
ORE= MO ASSMSED AS A UEN AGAINST THE PROPERTY %WERE 9104 fACUTIES ARE
LOCATED.
8. CURING THE UFE OF THE PROECT. TIE PERIATTEE SHAU. MAINTAIN 24 GOOD CCODITION
AND PROPTLY REPAIR. ESTNOR REPLACE ILL GRADE SURFACES WALLS DRANS,
ORG. STRUCTURES. EGETATION. ER0301 AND 18944041 COAT= MEASIJPES. AND OTHER
PROTECTIVE DEVI= 04 ACCORDANCE 1110 APPROVED RAMS
2 THE MATTE 91M1 VENITCR DE DOWNSTREAM ORMNAGE FEATURES AND SHALL NTH
THE =MICR'S APPROVAL ROWE AU. SENO& 50OS1IO4 503.1910 1801 PROECT
50115 50
10 ALL WA POEM/ED SHALL BE PER APPROVED PLANS MO SPEC:ROANS ONLY. THE
posarnm 6 mum TO MAINTAIN A SET OF APPROVED PLANS AND SvECIFICATIONS AND
ASSCOATED *MATS 041)40 JR SIM RORK SOU BE PERRIN= 04 Accomma NTH
ALL FEDERAL STATE, AND LOCAL Uri.
11. AS THE FRST MEER CF BUSHES THE PERMITTEE SHALL INSTALL EROSON P8010411011
AND 00)4040 0184150. MEASURES PER DE ESC MID SHALL INSTALL DE CIONISTREAM
TEMPORARY ESC MEASURES BEFORE ANY SITE DISAIRBANCE OCCURS. 80150 1145
TEMPORARY MEASURES ARE REMOVED, INSTALL AND ESTABLISH TIE UPSTREAM AMMO&
ESC MEASURES
12. 0* PERATTEE SUM- AT ALL MES PROTECT ENSTIVE AREAS THEIR EXAM AND
ADJACENT PRIVATE PROPERTIES AND PUEUC 810115 -0E -WAY OR EASEMENTS FROM DAMAGE
CORM GRADING °KRAAL:NS. THE PERNITTEE SHALL RESTORE TO ME STANDARDS PI
EFFECT AT DE TIE OF DIE ISSUANCE OF THE PERRI. =SINE AREAL 1)66 BIOME.
AND PUBLIC MID MATE PRCPERTES AND OPROVEMENTS DAMAGED BY ME PERIIIMIS
aflame.
13. PERMIT= SHALL ARRANGE RN AND COMPLY VIM THE FOLLOW&
A. RORY TIE PUBLIC ACAS CEPARTMENT 8114 RI 48 10185 MURANO INSTALL/MN CIF
ESC MEASURES
6. OBTADI PORMISSCO IN WAG FROM THE PUBLIC WORKS DEPART/ENT 10014 10
MONTH° THE ESC RAN.
0. MATADI ALL ROAD DRAKE SYSTEM. STORM WATER UNMADE SEEMS. MARX.
MEASUFES OA OTHER FACILMES AS UNWED IN THE ESC PLUL
D. REPAIR RN SILTATION OR OROSON DAMAGES TO AD80/040 MCPERTIES AND MANAGE
FAOUTES.
0.8450110 =CAM 10 THE APPROVED ESC INSPECIEN SCHEDULE MID MAXE /COED
REPARS ODIEDIATELY.
1 I N.T.S.
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SI TE s.
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VICINITY MAP
APPUCANT
SABEY CORPORATION
12201 TUKWILA INTERNATIONAL ELM
FOURTH FLOOR
SEATTLE, WASHINGTON 98168
CONTACT PERSON:
ANTHONY VINCENT (SUPERINTENDENT)
PH: 206.255.1180
EMAIL antbanyAsabutcarn
RENTON
CONSTRUCTION NOTES/SEOUENCe
0 INSTALL WORN DRAINAGE ABET PROTECTON ON DETING CATCH
aAspis.
°RALSE COSANG TOP CF STORM DRAIN STRUCTURE 2.0 FEET AND
SEPL ANTS
0 PROPOSED 1.0' H104 BERM AMMO PERIMETER.
HORIZONTAL DATUM
WASHINGTON STATE PLANE COORDINATE SYSTEM, NORTH ZONE. NAD 83/91
CITY OF SEATTLE SURVEY CONTROL 11041114ENT-HORIZONTM- (SPU
93H-834
1 3/81 DOILED BRASS CAP WITH CENTER PUNCHED SET IN 4-04"
CONCRETE TOP OF BRASS CAP 15 tor BELOW ASPHALT AND 0.82 BELOW
THE MONUMENT CASE RN.
MONUMENT LOCATED AT APPROXIMATE CENTERLINE OF S. NORFOLK ST.
APPROXIMATELY 505* NORTHEASTERLY CF THE 84011150111104 01 s.
NORFOLK ST. AND E. MARONAL WAY S.
OTY OF TUKWILA:
SOUND TRANSIT SETTIENT 755 RIGHT -CF -WAY COMM MONUMENT:
7702
(VEST 1/4 CCONER. SEC. 03. TM. 2344.. RN& 04 E)
3' OM. BRASS 01010 ((INC COUNTY 440141144040) SET F1J91 DIT)4 SIRFACE
STAMPED law COUNTY SJRVEY 193T 'STA 4 1 3'
1413141.11.1041 LOCATED APPROXINATELY AT THE SOUTH NEST CORNER OF
AUTO WRECKING YARD, 0.0* FROM 2' DIA, IRON PPE INAT 45 3' ABOVE
GROUND MVO 0.8* VEST OF CHAINUNX FENCE.
VERTICAL DATUM
NORTH AMEREMI VERTICAL DATUM OF 1988 (NAVD 88)
PROJECT soicrounics
CITY OF SEATTLE SURVEY COITROL MONUMENT -VERTICAL (SPU)1
940-5197
BRASS CAP STAMPED '5227- str APPROXIMATELY 0.3' FROM BA00 01
CONCRETE OMR.
MC:NUMMI' LOCATED AT ME NORTHEAST CORNER OF THE INTERSECTION CF
EAST MARGINAL WAY S. AND S. NORFOLK ST.
0.EV.•17.8135 (HAW 118)
CITY OF SEATTLE SURVEY CONTROL MONUMMT-VERTICAL (SPU)1
SI4V-5298
BRASS CAP STAMPED '5285 SET APPROXIMATELY 124 THE S.W. CORNER OF
20102/1 SEDER VALULT.
MONUMENT LOCATED AT THE NORTHWEST INTERSECT= S. NORFOLK ST.
AND AIRPORT WAY S.
B.EV.•21.585 (NAM 88)
9145 500144810.
DEA NO. 18 (CITY OF SEATTLE SJRVEY CONTROL MONUMENT 93H-834)
1 3/8' DOLED BRASS CAP YAM MITER PUNCHED SET 24 4'X4'
CONCRETE TOP OF BFIASS CAP 15 1.01 BELOW ASPHALT AND 0.8E BELOW
114E MOMENT CASE RITA.
MONUMENT LOCATED AT APPROXIMATE CENTERLINE OF S. NORFOLK ST.
APPROXIMATELY 505* NORTHEASTERLY OF THE 11000850111104 OF S.
NORFOX ST. AND E. MARGINALY WAY S.
D.EVN15.85 (NAN) 88)
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REVISIONS: APPD.
DATE: AUGUST. 2010
DESIGN: ,INLI
DRAWN: OAFU
CHSCICRD:
REVISION
NUMBOL
SCALE: 1...50'
PROJECT NUMBER:
DA8C00000030
DRAWING PILE:
ecEC00IDASC00000030
SHUT NO.
OP 1
1