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Targeted Drainage Report
Boeing Commercial Airplanes
Boeing North 6th Street Ditch Improvement
Renton, Washington
Submitted to
The Boeing Company
800 North Sixth Street
Renton, Washington 98055
14 November 2014
Prepared by:
BergerABAM 204
33301 Ninth Avenue South, Suite 300 NOV 2+ 4
Federal Way,Washington 98003-2600
Job No.A13.0362.06
3 ?403
TARGETED DRAINAGE REPORT
Boeing North 6th Street Ditch Improvement
Renton, Washington
TABLE OF CONTENTS
SECTION PAGE
PROJECT ENGINEER'S CERTIFICATE 1
Section 1: Project Overview 2
Existing Conditions 2
Proposed Conditions 2
Section 2: Conditions and Requirements Summary 3
Requirements Summary:Stormwater Management Guidelines 3
Core Requirement 1- Discharge at the Natural Location 3
Core Requirement 2-Off-site Analysis 4
Core Requirement 4-Conveyance System 4
Core Requirement 5- Erosion and Sediment Control 4
Core Requirement 6- Maintenance and Operations 4
Core Requirement 7- Financial Guarantees and Liability 4
Special Requirement 4-Source Control 4
Special Requirement 6—Aquifer protection Area 4
Section 3: Off-site Analysis 4
Section 4: Flow Control and Water Quality Facility Analysis and Design 4
Section 5: Conveyance System Analysis and Design 5
Section 6: Special Reports and Studies 5
Section 7: Other Permits 5
Section 8: Not Used 5
Section 9: Construction SWPPP Analysis and Design 5
Section 10: Bond Quantities, Facility Summaries, and Declaration of Covenant 5
Section 11: Operations and Maintenance Manual 5
Targeted Drainage Report BergerABAM,A13.036206
Boeing North 6th Street Ditch Improvement November 11,2014
Renton,Washington Page ii of iii
LIST OF APPENDICES
Appendix A Site Maps
Appendix B Drainage Maps and Calculations
Appendix C Stormwater Pollution Prevention Plan
Targeted Drainage Report BergerABAM,A13.0362.06
Boeing North 6th Street Ditch Improvement November 11,2014
Renton,Washington Page iii of iii
TARGETED DRAINAGE REPORT
BOEING NORTH 6TH STREET DITCH IMPROVEMENT
RENTON,WASHINGTON
PROJECT ENGINEER'S CERTIFICATE
I hereby certify that this Targeted Drainage Report for the Boeing North 6th Street Ditch
Improvement has been prepared by me or under my direct supervision and meets minimum
standards of care and expertise, which is usual and customary in this community for
professional engineers. I understand that the City of Renton does not and will not assume
liability for the sufficiency, suitability, or performance of drainage facilities designed by me.
Reviewed by
Connie Linden, PE 0 (,
Project Manager � ti.
05. 42 93
O cls lEgti° <<,
t c)e.sSioN.
AL fSC" 1,
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Targeted Drainage Report BergerABAM,A13.0362.06
Boeing North 6th Street Ditch Improvement November 14,2014
Renton,Washington Page 1 of 5
SECTION 1: PROJECT OVERVIEW
The proposed project is located within the North 6th Street public right-of-way,south of The
Boeing Commercial Airplane 737 Airplane Production Renton Plant located on the southern
shore of Lake Washington,within the City of Renton,Washington. The project site is bordered
by The Boeing Commercial Airplane 737 Airplane Production Renton Plant to the north and the
south, the Cedar River to the west, and Logan Avenue North further to the east.Surrounding
land use is predominantly commercial, industrial,and retail.A site vicinity map and project site
maps are provided in Appendix A.
The Boeing North 6th Street Ditch Improvement Project encompasses the addition of
approximately 85-linear feet of 12-inch perforated pipe,and two catch basins to collect and
convey drainage within the ditch located at the west end of North 6th Street on the north side of
the roadway.
It is the intent of this Targeted Drainage Report to address the site improvements proposed by
the project and the applicable conditions and requirements.
Existing Conditions
The topography of the area surrounding the project site is relatively flat, with slopes generally
ranging from less than 1 percent to less than 2 percent from east to west.Within the immediate
area of the improvements is a ninety-foot long graveled ditch that is approximately three feet
deep,with greater than two-to-one side slopes, located on the north side of North 6th Street,
west of the new entrance to Boeing's Truck Inspection project. Currently there is an 8-inch pipe
that daylights to the ditch at the east end of the ditch. This 8-inch culvert is part of a
conveyance system that collects drainage roadway drainage along North 6th Street.On the west
end of the ditch there is a 12-inch pipe that collects drainage from the ditch area, as well as
upstream roadway and landscaped areas within the right-of-way. See the drainage basin map
provided in Appendix A. The subject ditch conveys drainage to the west to a 12-inch outlet
pipe that connects to a catchbasin located at the intersection of North 6th Street and Nishiwaki
Lane. The storm conveyance system within Nishiwaki Lane ultimately outfalls to the north to
Lake Washington.
Proposed Conditions
Surface cover and hydrology at the project site will be essentially unchanged by the proposed
improvements.The proposed project will install a 12-inch perforated pipe at the existing ditch
alignment,and connect to the existing ditch western 12-inch outlet pipe.The ditch will be
backfilled with free-draining gravel backfill. See the Site Utility Plan in Appendix A.
Targeted Drainage Report BergerABAM,A13.0362.06
Boeing North 6th Street Ditch Improvement November 14,2014
Renton,Washington Page 2 of 5
TABLE 1.0-Existing and Proposed Site Surface Cover
Areas
Surface Cover
0.843 acres
Total Tributary Area (36,712 sf)
0.190 acres
Pervious (Landscape) (8,273 sf)
0.653 acres
Impervious(Pavement, buildings,etc.) (28,439 sf)
Total Site 0.843 acres
(36,712 sf)
SECTION 2: CONDITIONS AND REQUIREMENTS SUMMARY
•
The following are the design standards that are applicable to this project.
• City of Renton Municipal Code
• City of Renton Development Standards
• City of Renton Amendments to the King County Surface Water Design Manual,2010
• King County Surface Water Design Manual,2009(KCSWDM)
• State Environmental Policy Act(RCW 43.21C)
The following manual is applicable to this project when a specific subject is not covered or
discussed in the above listed documents.
• WSDOT Design Manual
Requirements Summary: Stormwater Management Guidelines
The project site and Threshold Discharge Areas are subject to a Targeted Drainage Review per
the City of Renton Amendments to the King County Surface Water Design Manual.This project
falls within the TDR Project Category#2, since the project proposes to construct or modify a
drainage pipe/ditch that is 12-inches or more in size/depth or receives surface and stormwater
runoff from a drainage pipe/ditch that is 12-inches or more in size/depth.
Core Requirement 1-Discharge at the Natural Location
This project will add structures and 12-inch perforated pipe to an existing stormwater
conveyance system.No significant net change to tributary areas or discharge locations will
occur as a result of the improvements proposed by this project.Rather, this project is a
maintenance or repair project, which proposes to fill an existing ditch that has less than
standard side-slopes, more specifically, ditch side-slopes are steeper than the standard two-foot
horizontal to one-foot vertical.
Targeted Drainage Report BergerABAM,A13.0362.06
Boeing North 6th Street Ditch Improvement November 14,2014
Renton,Washington Page 3 of 5
Core Requirement 2-Off-site Analysis
A qualitative off-site analysis is not required per the City of Renton Amendments to the
KCSWDM,Section 1.2.2 Core Requirements#2:Offsite Analysis, sub-heading Exemption from
Core Requirement#2, on page 1-21;which states:
"A proposed project is exempt from Core Requirement#2 if... The project does not change the
rate, volume, duration,or location of discharges to and from the project site(e.g., where existing
impervious surface is replaced with other impervious surface having similar runoff-generating
characteristics, or where pipe/ditch modifications do not change existing discharge
characteristics)."
Core Requirement 4 - Conveyance System
The project results in no significant change in the flow characteristics of the existing onsite
conveyance system, and therefore, does not require conveyance capacity analysis per the City of
Renton Amendments to the KCSWDM,Section 1.2.4.2, Conveyance Requirements for Existing
Systems.However, stormwater calculations for the specific pipe runs are provided to show
there will be no overtopping of the newly installed catch basins installed within the existing
ditch area.
Core Requirement 5- Erosion and Sediment Control
A project-specific stormwater pollution prevention plan(SWPPP)has been prepared for the
construction of this project and are included as part of this report.
Core Requirement 6-Maintenance and Operations
No new stormwater facilities requiring a change to the existing maintenance or operation in
place are added as a part of this project.
Core Requirement 7- Financial Guarantees and Liability
Will be provided by Boeing if required.
Special Requirement 4-Source Control
The project does not meet the threshold to require source control.
Special Requirement 6 - Aquifer protection Area
The project site is not located within an Aquifer Protection Area based on the Groundwater
Protection Areas in the City of Renton Map included in the City of Renton Amendments to the
KCSWDM.
SECTION 3: OFF-SITE ANALYSIS
A qualitative off-site analysis is not required per the City of Renton Amendments to the
KCSWDM.
SECTION 4: FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN
The project qualifies for exemption from both water quality and flow control analysis per the
City of Renton Amendments to the KCSWDM.
Targeted Drainage Report BergerABAM,A13.0362.06
Boeing North 6th Street Ditch Improvement November 14,2014
Renton,Washington Page 4 of 5
SECTION 5: CONVEYANCE SYSTEM ANALYSIS AND DESIGN
The project results in no significant change in flow characteristics of the existing onsite
conveyance system and therefore does not require conveyance capacity analysis per City of
Renton Amendments to the KCSWDM.
SECTION 6:SPECIAL REPORTS AND STUDIES
Not Applicable
SECTION 7: OTHER PERMITS
The following is a list of the actions and permits that have been obtained as part of this project.
• State Environmental Policy Act
• National Pollution Discharge Elimination System—Construction Stormwater General Permit
• Right-of-Way Use Permit
SECTION 8: NOT USED
SECTION 9: CONSTRUCTION SWPPP ANALYSIS AND DESIGN
A construction SWPPP has been prepared for the project and is included in Appendix C.
SECTION 10: NOT USED
SECTION 11: OPERATIONS AND MAINTENANCE MANUAL
The public stormwater facilities for this project include catch basins for collection of stormwater
runoff.The proposed conveyance system will connect to an existing 12-inch pipe that conveys
drainage to the North 6th Street closed conveyance system at the intersection of North 6th Street
and Nishiwaki Lane,within the public right-of-way.This roadway system lies within the
jurisdiction of the City of Renton and will be maintained by the City.
Targeted Drainage Report BergerABAiM,A13.0362.06
Boeing North 6th Street Ditch Improvement November 14,2014
Renton,Washington Page 5 of 5
Targeted Drainage Report
Boeing North 6th Street Ditch Improvement
Renton, Washington
Appendix A
Site Maps
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Targeted Drainage Report
Boeing North 6th Street Ditch Improvement
Renton, Washington
Appendix B
Calculations
Conveyance Calcs - Ditch along 6th Street
TI Drainage Ditch Event Summary
Event Peak Q (cfs) Peak T (hrs) Hyd Vol(acft) Area (ac) Method
2 yr 24 hr 0.3223 8.00 0.11 0.843 SBUH
10 year 0.498 8.00 0.1702 0.843 SBUH
25 year 0.5967 8.00 0.2041 0.843 SBUH
100 year I 0.6958 I 8.00 0.2383 0.843 I SBUH
All results based on storm duration of 24.0 hours. This is ok if all precipitations are appropriate
for the storm duration. If some design event precipitations are for different duration storms,
those results are incorrect
Record Id: TI Drainage Ditch
Design Method SBUH Rainfall type TYPEIA.RAC
Hyd Intv 10.00 min Peaking Factor 484.00
Storm Duration 24.00 hrs Abstraction Coeff 0.20
Pervious Area 0.19 ac DCIA 0.653 ac
Pervious CN 86.00 DC CN 98.00
Pervious TC I 5.00 min IDC TC I 5.00 min
Pervious CN Calc •
Description SubArea Sub en
Open spaces, lawns,parks (<50%grass) I 0.19 ac 86.00
Pervious Composited CN (AMC 2) I 86.00
Pervious TC Calc
Type Description Length Slope Coeff Misc TT
Sheet I 0.00 ft I 0.0% I 5.0 0.00 in 5.00 min
Pervious TC I 5.00 min
DCI-CN Calc
Description SubArea Sub cn
Impervious surfaces (pavements, roofs, etc) I 0.653 ac 98.00
DC Composited CN (AMC 2) I 98.00
DCI -TC Calc
•
Type Description Length Slope Coeff Misc TT
!Sheet I I 0.00 ft I 0.0% I 5.0 I 0.00 in 5.00 min
Pervious TC I 5.00 min
Routing 25-year storm
OUTLET C.B-132 CB-01
4E— U P-1 Li
ROUTEHYD [] THRU [ditch] USING [25 year] AND [TYPE1A.RAC] NOTZERO
RELATIVE SCS/SBUH
Gravity Analysis using 24 hr duration storm
Infil
Reach Area Flow Full Q Full nDepth Depth nVel fVel CBasin/
ol
ID (ac) (cfs) (cfs) ratio (ft) ratio Size (ft/s) (ft/s) ( Hyd
12 in TI
P-1 0.843 0.5967 0.387 1.5418 na Diam 0.7598 0.4928 0.00 Drainage.
Ditch
P-2 0.843 0.5967 9.7907 0.0609 0.1674 0.1674 12 in 6.8928 12.4658 0.00
Diam
HGL Analysis
From HG El • App Bend Junct Loss Adjusted HG El Max El
Node To Node (ft) (ft) (ft) (ft) (ft) (ft)
19.4462
CB-02 OUTLET 20.2393 0.0001 20.2394 21.7000
CB-01 I CB-02 120.8509 I I I I 20.8509 122.5000
Conduit Notes
Reach HW Depth HW/D Q TW Depth Dc(ft) Dn Comment
(ft) ratio (cfs) (ft) (ft)
P-2 0.4103 0.4103 0.60 0.3212 0.3212 0.1674 SuperCrit flow, Inlet end
controls
P-1 1 1.0283 1 1.0283 1 0.60 1 1.0000 10.32121 >D (Outlet Control
Record Id: CB-01
Descrip: Prototype Record Increment 0.10 ft
Start El. 19.83 ft Max EL 22.50 ft
Void Ratio 100.00 F
Condition Existing Structure Type CB-TYPE 1
Channelization No Special Shape
Catch 10.00 ft (Bottom Area 13.97 sf
IMH/CB Type Node
Record Id: CB-02
Descrip: Prototype Record Increment 0.10 ft
Start El. 19.82 ft Max El. 21.70 ft
Void Ratio 100.00 1
Condition Existing Structure Type CB-TYPE 1
Channelization No Special Shape
!Catch 10.00 ft (Bottom Area 13.97 sf
IMH/CB Type Node
Record Id: OUTLET
Descrip: !Prototype Record Increment 0.10 ft
Start El. 19.13 ft Max El. 21.00
ft
Void Ratio 1100.00 I 1 F
!Dummy Type Node
Record Id: P-1
Section Shape: Circular
Uniform Flow Method: Manning's Coefficient: 0.012
Routing Method: Travel Time Shift Contributing Hyd
DnNode CB-02 UpNode CB-01
Material unspecified 'Size I 12 in Diam
Ent Losses Groove End w/Headwall
Length 74.00 ft Slope 0.01%
Up Invert I 19.83 ft 'Dn Invert ' 19.8226 ft
Conduit Constraints
Min Vel Max Vel Min Slope Max Slope Min Cover
I 2.00 ft/s 15.00 ft/s I 0.50% I 2.00% I 3.00 ft
'Drop across MH I 0.00 ft 'Ex/Infil Rate I 0.00 in/hr
Record Id: P-2
Section Shape: Circular
Uniform Flow Method: Manning's Coefficient: 0.012
Routing Method: Travel Time Shift Contributing Hyd
DnNode OUTLET UpNode CB-02
Material unspecified 'Size I 12 in Diam
Ent Losses I Groove End w/Headwall
Length r 11.00 ft Slope 6.40%
rUp Invert ( 19.829 ft IDn Invert ' 19.125 ft
Conduit Constraints
Min Vel Max Vel Min Slope Max Slope I Min Cover
I 2.00 ft/s I 15.00 ft/s I 0.50% I 2.00% I 3.00 ft
(Drop across MH I 0.00 ft IEx/Infil Rate I 0.00 in/hr
Targeted Drainage Report
Boeing North 6th Street Ditch Improvement
Renton, Washington
Appendix C
Stormwater Pollution Prevention Plan
Boeing Renton 60 Street Ditch Improvement Storm water Pollution Prevention Plan
Stormwater Pollution Prevention Plan
For
Boeing Renton 6th Street Ditch Improvement
Prepared For
Northwest Regional Office
3190- 160th Avenue SE
Bellevue, WA 98008-5452
425-649-7000
Owner Contractor
The Boeing Company GLY Construction, Inc.
800 N. 6th Street 200 112th Ave NE, Ste 300
Renton, WA 98055 Bellevue, WA 98004
Project Site Location
The Boeing Company
800 N. 6th Street
Renton, WA 98055
Certified Erosion and Sediment Control Lead
Glen Trowbridge, Superintendent
GLY Construction, Inc.
SWPPP Prepared By
BergerABAM
33301 9th Avenue South, Suite 300
Federal Way, WA 98003-2600
(206)431-2351
Kimberly Hinds, P.E.
Reviewed by
BergerABAM
Connie Linden, P.E.
SWPPP Preparation Date
November 14, 2014
Approximate Project Construction Dates
Begin Construction: January 2015
End Construction: February 2015
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Boeing Renton 61h'Street Ditch Improvements SWPPP 1
Boeing Renton 6th Street Ditch Improvement Stormwater Pollution Prevention Plan
Contents
Section 1.0 Introduction 4
Section 2.0 Site Description 6
2.1 Existing Conditions 6
2.2 Proposed Construction Activities 6
Section 3.0 Construction Stormwater BMPs 7
3.1 The 12 BMP Elements 7
3.1.1 Element#1 —Mark Clearing Limits 7
3.1.2 Element#2—Establish Construction Access 8
3.1.3 Element#3 —Control Flow Rates 8
3.1.4.Element#4—Install Sediment Controls 8
3.1.5 Element#5-Stabilize Soils 8
3.1.6 Element#6—Protect Slopes 9
3.1.7 Element#7—Protect Drain Inlets 9
3.1.8 Element#8—Stabilize Channels and Outlets 9
3.1.9 Element#9—Control Pollutants 9
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.
Section 4.0 Construction Phasing and BMP Implementation 15
Section 5.0 Pollution Prevention Team 1 5
5.1 Roles and Responsibilities 1
5.2 Team Members 16
Section 6.0 Site Inspections and Monitoring 17
6.1 Site Inspection 17
6.1.1 Site Inspection Frequency 18
6.1.2 Site Inspection Documentation 18
6.2 Stormwater Quality Monitoring 18
6.2.1 Turbidity Sampling 18
6.2.2 pH Sampling 20
Section 7.0 Reporting and Recordkeeping 20
7.1 Recordkeeping 20
7.1.1 Site Log Book 20
7.1.2 Records Retention 21
7.1.3 Access to Plans and Records 21
7.1.4 Updating the SWPPP 21
7.2 Reporting .21
7.2.1 Discharge Monitoring Reports 21
14 November 2014
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•
Boeing Renton 6"'Street Ditch Improvement Stormwater Pollution Prevention Plan
7.2.2 Notification of Noncompliance 22
Appendices 23
Appendix A—Site Plans A-1
Appendix B—Construction BMPs B-1
Appendix C—Alternative Construction BMPs C-1
Appendix D—Construction Stormwater General Permit D-1
Appendix E—Site Inspection Checklist(and Site Log Book) E-1
Appendix F- Engineering Calculations F-1
•
•
14 November 2014
Boeing Renton 6'h Street Ditch Improvements SWPPP 3
Boeing Renton 6th Street Ditch Improvement Stormwater Pollution Prevention Plan
Section 1.0 Introduction
This Stormwater Pollution Prevention Plan (SWPPP) has been prepared as part of the NPDES
Construction Stormwater General Permit requirements for the Boeing Renton Site 6`h Street
Ditch Improvement construction project.in Renton, Washington. The 6`h Street Ditch
Improvement Project encompasses filling in the ditch alongside 6`1' Street and adding stormwater
conveyance between two existing pipes.
The project objectives include
• Providing a safer shoulder area;
• Provide a level access area to an existing fire hydrant.
This improvement will affect approximately 500 square feet of area just north of 6`1' Street within
the right-of-way.This portion of the site is within the 200-foot shoreline setback of the Cedar
River.
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:
I. 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 to the receiving water, Cedar River,for the project site.
This SWPPP was prepared based on the requirements set forth in the Construction Stormwater
General Permit, Stormwater Management Manual for Western Washington (SWMMWW August
2005),the King County Surface Water Design Manual(KCSWDM January 2009), and the
Construction Stormwater General Permit Renton Site Guidance Document, dated August 15,
2011.
This report is divided into seven main sections with several appendices that include stormwater
related reference materials. The topics presented in the each of the main sections are:
■ Section 1 —INTRODUCTION. This section provides a summary
description of the project,and the organization of the SWPPP document.
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Boeing Renton 6th Street Ditch Improvement Stormwater Pollution Prevention Plan
■ Section 2—SITE DESCRIPTION. This section provides a detailed
description of the existing site conditions, proposed construction activities,
and calculated stormwater flow rates for existing conditions and post—
construction conditions for this project.
■ Section 3 —CONSTRUCTION STORMWATER BMPs. This section
provides a detailed description of the BMPs to be implemented for the
project based on the twelve required elements of the SWPPP.
•
• Section 4—CONSTRUCTION PHASING AND BMP
IMPLEMENTATION. This section provides a description of the timing
of the BMP implementation for the project.
• Section 5 —POLLUTION PREVENTION TEAM. This section identifies
the appropriate contact names(emergency and non-emergency),
monitoring personnel, and the onsite temporary erosion and sedimentation
control inspector.
• Section 6—SITE INSPECTION AND MONITORING. This section
provides a description of the inspection and monitoring requirements such
as the parameters of concern to be monitored, sample locations, sample
frequencies, and sampling methods for the stormwater discharge location
on the plans(see Appendix A for the Site and Utility Plan).
• Section 7—REPORTING AND RECORDKEEPING. This section
describes the requirements for documentation of the BMP implementation,
site inspections, monitoring results, and changes to the implementation of
certain BMPs due to site factors experienced during construction.
Supporting documentation and standard forms are provided in the following Appendices:
Appendix A— Site plans
Appendix B— Construction BMPs
Appendix C— Alternative Construction BMPs (None Anticipated)
Appendix D— Construction Stormwater General Permit(To be inserted)
Appendix E— Site Inspection Checklist(and Site Log Book)
Appendix F— Engineering Calculations
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Boeing Renton 6th Street Ditch Improvement Stormwater Pollution Prevention Plan
Section 2.0 Site Description
2.1 Existing Conditions
The project area includes a graveled ditch approximately 3 feet deep and 90-feet long with side
slopes steeper than two horizontal to one vertical. The topography of the area at the top of
existing ditch embankment;and immediately adjacent to the ditch, is relatively flat, with slopes
generally ranging from less than 1 to approximately 2 percent. The project area is located along
the northern right-of-way of North 6`h Street in Renton, adjacent to the Boeing Commercial
Airplane 737 Airplane Production Renton Plant.
The City of Renton Stormwater Management Design Manual 2009)Amendment, Reference
11C, shows site soils as Urban Land. Urban land is generally soil that has been significantly
modified by urbanization and disturbance of the natural soil layers. The probable erosion hazard
is slight to moderate.
The project area includes limited portions of work located within the 200-foot setback from the
Ordinary High Water Mark(OHWM) of the Cedar River. Pursuant to RMC 4-3-090(6)(3),these
areas are subject to the Shoreline Master Plan (SMP) Regulations. Based on the OHWM
delineation provided by the City of Renton, portions of the North 6th Street Ditch Improvement
Project are located within the SMP jurisdiction. However, with the limited scope of this project,
the SMP jurisdiction considers this project work normal maintenance or repair of existing
development. The scope of this project consists primarily of the installation of 12-inch perforated
pipe,two catch basins, and backfilling a roadside ditch. The ditch is being filled due to steep
(less than 2:1) side slopes.
2.2 Proposed Construction Activities
•
Proposed construction activities for the project include the addition of approximately 85 linear
feet of perforated pipe, the installation of two catch basins, and the backfilling the ditch with
drainage rock.
Surface cover,topography, and hydrology at the project site will be essentially unchanged by the
proposed improvements. The proposed improvements will provide a flat area for access to an
existing fire hydrant, and safer shoulder area condition.
The following summarizes details regarding site areas and stormwater runoff peak flows:
■ Total site area(includes tributary runoff area): 0.843 acres
■ Percent impervious area before construction: 77%
■ Percent impervious area after construction: 77%
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Boeing Renton 6"'Street Ditch Improvement Stormwater Pollution Prevention Plan
■ Disturbed area during construction: 0.010 acres
• Disturbed area that is characterized as impervious(i.e.,
access roads, staging, parking): 0.010 acres
• 2-year stormwater runoff peak flow prior to construction
(existing): 0.322 cfs*
■' 10-year stormwater runoff peak flow prior to construction
(existing): 0.498 cfs*
• 2-year stormwater runoff peak flow during construction: 0.322cfs*
• 10-year stormwater runoff peak flow during construction: 0.498 cfs*
• 2-year stormwater runoff peak flow after construction: 0.322 cfs*
■ 10-year stormwater runoff peak flow after construction: 0.498 cfs*
*See the stormwater calculations assumptions provided in Appendix F. Note that the project
area is approximately 450 sf(0.010 acre), however,the site collects drainage from 0.843 acre
upstream and to the east, as shown on the basin drainage map provided in Appendix A.
Section 3.0 Construction Stormwater BMPs
3.1 The 12 BMP Elements
All BMP numbers listed below correspond to the Department of Ecology's 2005 Stormwater
Management Manual for Western Washington and shall be installed, maintained, and removed in
accordance with said manual. Site and Utilities Plans showing proposed BMPs locations are
included in Appendix A.
3.1.1 Element#1 —Mark Clearing Limits
To protect adjacent roadway pavement areas, site work limits will be marked and coordinated
with Boeing Site Services and Construction Management. Construction fencing will be installed
to clearly designate the construction and laydown area, and shall be installed prior to the start of
construction work. The BMPs relevant to marking the work limits that will beapplied for this
project include:
•
• High Visibility Fence (BMP C103)
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Boeing Renton 6th Street Ditch Improvement Stormwater Pollution Prevention Plan
3.1.2 Element#2—Establish Construction Access
The project site construction access will be via an existing paved drive located to the east of the
project ditch area.
Sweeping and cleaning will be done to prevent sediment from entering area storm structures and
State receiving waters (Cedar River then Lake Washington). The specific BMPs related to
establishing construction access that will be used include:
• Stabilized Construction Entrance: Existing paved roads
3.1.3 Element#3—Control Flow Rates
Stormwater discharge from the site will not change from the existing condition.No increase in
impervious areas that will alter site hydrology is anticipated during or after the construction of
the proposed improvements that will create flooding or erosion concerns at the project site's
outfall locations. Catch basins within the project site shall be protected from sediment as
indicated in Section 3.1.4, Element 4 below.
• No BMPs to be implemented due to the limited flows the site currently receives.
In addition,the project site does not increase impervious surfaces.
3.1.4 Element#4—Install Sediment Controls
All stormwater runoff from disturbed areas will pass through an appropriate sediment removal
BMP before leaving the construction site area. BMPs that will are used are:
• Silt Fence (BMP C233)
• Storm Drain Inlet Protection(BMP C220)
3.1.5 Element#5—Stabilize Soils
Exposed and unworked soils shall be stabilized with the application of effective BMPs to prevent
erosion throughout construction. The specific BMPs for soil stabilization that will be used on
include:
• Dust Control (BMP C 140)
• Plastic Covering(BMP C123)
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 I to September 30)and
not more than 2 days during the wet season(October 1 to April 30). Regardless of the time of
year, all soils will be stabilized at the end of the shift and before a holiday or weekend if needed
based on weather forecast.
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Boeing Renton 6th Street Ditch Improvement Stormwater Pollution Prevention Plan
In general,cut and fill slopes will be stabilized as soon as possible with plastic sheeting.
3.1.6 Element#6—Protect Slopes
All cut and fill slopes will be designed, constructed, and protected in a manner that minimizes
erosion. The following specific BMPs will be used to protect slopes:
• Plastic Cover(BMP C123)
• Nets and Blankets (BMP C 122)
3.1.7 Element#7—Protect Drain Inlets
All adjacent existing and newly constructed storm drain inlets and catch basins operable during
construction shall be protected to prevent unfiltered or untreated water from entering the
stormwater conveyance system(s). The first priority is to keep all construction areas clean of
sediment, and keep pavement wash waste water from entering storm drains until treatment can
be provided. The following inlet protection measures will be applied:
• Storm Drain Inlet Protection(BMP C220)
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:
• No BMPs anticipated to be implemented.
This construction project is located adjacent to paved roadway to the south,east, and
west, and landscaping to the north. Drainage will discharge to the downstream
receiving water(Cedar River) via a manmade closed conveyance system. Drainage
will,as in the existing condition, be directed to an existing conveyance system, which
will be protected from sediment as specified in Section 3.1.7, Element#7 above.
3.1.9 Element#9—Control Pollutants
All pollutants, including waste materials and demolition debris occurring on the construction
site, will 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, and will be coordinated by the CESCL
with Boeing Construction Management, Environmental, Health and Safety(EHS)and Site
Services prior to implementation.
Vehicles,construction equipment,and/or petroleum product storage/dispensing:
14 November 2014
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Boeing Renton 6th Street Ditch Improvement Stormwater Pollution Prevention Plan
• 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.
• 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.
• 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.
Demolition:
• Dust released from any demolition work 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 Elements 4 and 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).
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
14 November 2014
Boeing Renton 6th Street Ditch Improvements SWPPP 10
Boeing Renton 6th Street Ditch Improvement Stormwater Pollution Prevention Plan
(BMP C151).
Sanitary wastewater:
• Portable sanitation facilities will be firmly secured, regularly maintained, and
emptied when necessary.
Solid Waste:
• Solid waste will be stored in secure,clearly marked containers.
Other:
• Other BMPs will be administered as necessary to address any additional
pollutant sources on site
3.1.10 Element#10—Control Dewatering
Groundwater intrusion is not anticipated; and therefore, no dewatering will be implemented for
this project.
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 will be conducted in accordance with each particular BMPs maintenance requirements, as
recommended by Ecology's Stormwater Management Manual for Western Washington, Volume
11, construction Stormwater Pollution Prevention, and Construction Stormwater General
(NPDES) Permit requirements. Visual monitoring of the BMPs will be conducted at least once
every calendar week and within 24 hours of any stormwater or non-stormwater discharge from
the site. If the construction site becomes inactive, and is temporarily stabilized,the inspection
frequency will be reduced to once every month. However this reduced inspection schedule will
be coordinated with the Boeing Construction Management, EHS and Site Services before
implementation of this reduced inspection schedule.
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 required, and removal is
approved by Boeing Construction Management, EHS and Site Services. Trapped sediment shall
be removed and disposed offsite at an approved disposal site.
3.1.12 Element#12—Manage the Project
Erosion and sediment control BMPs for this project have been designed based on the following
principles:
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Boeing Renton 6t Street Ditch Improvements SWPPP 11
Boeing Renton 6'h' Street Ditch Improvement Stonnwater Pollution Prevention Plan
• 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 sediment and erosion control measures.
• Inspection, monitoring and repairing of all BMPs will be done as needed or as specified
to ensure continued performance of their intended function. Site inspections and
monitoring will be conducted in accordance with Special Condition S4 of the General
Permit.
• This SWPPP will be maintained, updated, and implemented in accordance with Special
Conditions S3, S4 and S9 of the General Permit.
As this project construction 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 limited in scope to the installation of perforated pipe
within an existing ditch and backfilling the ditch. Construction timeframe is less
than 30 days.-
Seasonal Work Limitations
• From October 1 through April 30 clearing, grading,and other soil disturbing
activities shall comply with wet season BMPs approved by Ecology for use, and
shall comply with Boing and local permitting authority requirements in order to
prevent silt-laden runoff from leaving the construction site work area through a
combination of the following:
o Exposed work soil areas/stockpiles will be covered with plastic. The
use of ditching, sumps, and other measures will be employed as
necessary to allow proper completion of the construction work.
o Grading and earthwork will not be accomplished during periods of
heavy,continuous rainfall.
o From October 1 through April 30, no soils will remain exposed and
un-worked for more than two (2)days.
o Daily visual monitoring of BMPs will be done.
•
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Boeing Renton 6"' Street Ditch Improvement Stormwater Pollution Prevention Plan
• 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; and,
o Routine maintenance of public facilities or existing utility structures
that do not expose the soil or result in the removal of the vegetative
cover or other surface cover to soil.
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 shall have the
necessary skills to:
o Assess the site conditions and construction activities that could impact
the quality of stormwater, and
o Assess the effectiveness of erosion and sediment control measures
used to control the quality of stormwater discharges.
• A Certified Erosion and Sediment Control Lead (CESCS) shall be on-site
or on-call at all times.
• Whenever inspection and/or monitoring reveals that 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 and available to Boeing Construction Management, EHS and Site
Services on request.
• The SWPPP shall be modified whenever there is a change in the design,
construction, operation, or maintenance at the construction site that has, or
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Boeing Renton 6'h Street Ditch Improvements SWPPP 13
Boeing Renton 6th Street Ditch Improvement Stormwater Pollution Prevention Plan
could have, a significant effect on the discharge of pollutants to waters of
the state.
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Boeing Renton 6th Street Ditch Improvement Stormwater Pollution Prevention Plan
Section 4.0 Construction Phasing and BMP
Implementation
The BMPs implementation schedule will be driven by the construction schedule. The following
provides a sequential list of the proposed construction schedule and corresponding BMPs
implementation. The project site is located west of the Cascade Mountain Crest. As such, the
dry season is considered to be form May 1 to September 30 and the wet season is considered to
be from October 1 to April 30. •
• Wet Season starts: 10/01 /2014
• Site inspections and monitoring conducted weekly and
for applicable rain events as detailed in Section 6 of this
SWPPP: 01/02/2015
• Implement Element#12 BMPs and manage site to
minimize soil disturbance during the wet season As site or
weather
conditions
dictate
• Estimate of Construction start date: 01/02/2015
• Estimate of Construction finish date 01/31/2015
• Sitework Complete: 01/25/2015
• Remove Temporary BMPs: 01/30/2015
Section 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
sediment and erosion control measures.
• Boeing(Owner) Contacts—individuals that are the site owner or
representative of the site owner to be contacted if required.
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Boeing Renton 6m Street Ditch Improvement Stormwater Pollution Prevention Plan
• Boeing(Owner) Contact—individual that is the site owner or
representative of the site owner to be contacted in the case of an
emergency.
• Emergency Ecology Contact— individual to be contacted at Ecology in
case of 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-contractor and Boeing(owner)personnel
responsible for conducting water quality monitoring(For the contractor,
this person is also the Certified Erosion and Sediment Control Lead
(CESCL) or his/her certified designee).
5.2 Team Members
Names and contact information for those identified as members of the pollution prevention team
are provided in the following table.
Phone
Title Name(s) Number
Contractor Certified Erosion Doug Bright (425-765-0844
and Sediment Control Lead GLY Construction, Inc.
(CESCL) Email: @g Y•dou .bri ht 1 com
g g
Boeing Construction Mgmt Brad Hibbard (206)218-9520
Contact Email:bradley.d.hibbard@boeing.com
Boeing EHS Contact(s) Chad Budworth (425)578-4318
Email:chad.w.budworth@boeing.com
Alternate: Doris Turner (425)965-2304
Email: doris.s.turner boeing.com
Boeing Site Services Contact Michael Sullivan (206)617-5465
Email: michael.j.suIlivan@boeina.com
Boeing Emergency Contact Brad Hibbard (206)218-9520
Email:bradlev.d.hibbard r boeing.com
Ecology Emergency Contact Northwest Region (425)649-7000
Non-Emergency Ecology Tracie Walters (425)649-4484
Contact Email: twal461@ecy.wa.2ov
(Ecology Northwest Regional
Office, Bellevue, WA)
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Boeing Renton 60 Street Ditch Improvement Stormwater Pollution Prevention Plan
Contractor Glen Trowbridge (425)451-8877
Inspection/Monitoring GLY Construction, Inc.
Personnel Email:glen.trowbridge@gly.com
Boeing Site Services Chad Budworth (425)578-4318
Inspection/Monitoring Email: chad.w.budworth(aThoeing.com
Oversight
Section 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 on the Site Inspection Checklist(Site
Log Book). A site log book shall be maintained on and kept available on the site during the
entire course of construction activities and shall include:
• A record of the implementation of the SWPPP and other permit requirements
• Site inspections checklists
• Stormwater quality monitoring
The Inspection Checklist/water quality monitoring form is included in this SWPPP in Appendix
E. This SWPPP may function as the site log book if desired, or the Inspection Checklist forms
may be separated and included in a separate site log book. However if separated,the site log
book must be maintained on-site or within reasonable access to the site and be made available
upon request to Boeing Construction Management, EHS, Site Services, and Ecology or other
local jurisdiction having authority.
6.1 Site Inspection
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 C 160. 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 stormwater
discharge points. Stormwater will be examined for the presence of suspended sediment,
turbidity, discoloration, and oily sheen. The site inspector(CESCL)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 on the Inspection Checklist Form provided in Appendix E of
this SWPPP document. All new BMPs or design changes will be documented in this SWPPP as
soon as possible.
14 November 2014
Boeing Renton 6'1'Street Ditch Improvements SWPPP 17
Boeing Renton 6th Street Ditch Improvement Stormwater Pollution Prevention Plan
6.1.1 Site Inspection Frequency
Site inspections will be conducted at least once a week and within 24 hours following any
discharge 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(CESCL) will record each site inspection using the site log Inspection
Checklist form provided in Appendix E. The site inspection log(Inspection Checklist form(s))
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 Boeing Construction
Management, EHS, Site Services,and Ecology or other local jurisdiction having authority.
6.2 Stormwater Quality Monitoring
Sampling and monitoring is required at all points where stormwater from construction activity is
discharged from the project site. Sampling points will be coordinated(by the contractor) with
Boeing Construction Management, EHS and Site Services prior to the start of excavation or soil
disturbing work,and shall be clearly marked in the field with flags,tape or other visible marker
and noted on the site plans provided in Appendix A.Turbidity Sampling
Turbidity sampling and monitoring shall be conducted during the entire construction phase of the
project. Sampling will be done within 24 hours of any discharge from the project site and at
least once per calendar week. Monitoring points will be located at storm drain catch basins
immediately downstream of the project site. The contractor shall note sampling points on the
Site Plan provided in Appendix A of this SWPPP document.
Turbidity sampling will follow the analytical methodologies described in Section S4 of the
General Permit. Turbidity analysis will be done with a calibrated turbidity meter either on site or
at the Boeing Environmental Lab. Results will be recorded in the site log book(Inspection
Checklist form). The key benchmark value is 25 nephelometric turbidity units (NTU) for the
downstream receiving water body for permit compliance.
If there is no flow in these sampling point catch basins:
• The attempt to sample will be recorded in the site log book and the monthly Discharge
Monitoring Report(DMR)as"No Discharge."
If the 25 NTU benchmark for turbidity is exceeded in any sample collected from monitoring
points,the following steps will be conducted:
• Ensure all BMPs specified in this SWPPP are installed correctly and functioning as
intended per the TESC Plan sheets (see Appendix A)and the Department of Ecology's
14 November 2014
Boeing Renton 6th Street Ditch Improvements SWPPP 18
Boeing Renton 6th Street Ditch Improvement Stormwater Pollution Prevention Plan
Stormwater Management Manual for Western Washington, Volume II, Construction
Stormwater Pollution Prevention.
• Assess whether additional BMPs should be implemented and document revisions and the
date that the activity occurred to the site log book, SWPPP, and the site plan sheet, as
necessary.
• Sample discharge location daily until the analysis results are 25 NTU or less.
• All BMP implementation and maintenance will be documented in site log book.
If the turbidity is greater than 25 NTU but less than 250 NTU the following steps will be
conducted:
• The SWPPP will be reviewed and appropriate revisions made within 7 days of the date
the discharge exceeded the benchmark.
• Immediately begin to fully implement and maintain appropriate source control and/or
treatment BMPs as soon as possible. The additional treatment BMPs should address the
problems within 10 days of the date the sample exceeded the benchmark value. If
installation of necessary treatment BMPs is not feasible within 10 days, Ecology may
approve additional time if requested within the initial 10-day response period.
• All BMP implementation and maintenance will be documented in site log book.
If the turbidity exceeds 250 NTU at any time, the following steps will be conducted:
• Notify Boeing Environmental Affairs immediately. Boeing Environmental Affairs
personnel typically report to Ecology's Northwest Region Environmental Report
Tracking System (ERTS). However if the Boeing Environmental Affairs are not
available, notify Ecology's Northwest Region ERTS by phone within twenty-four(24)
hours. Report this notification to the Boeing Environmental Affairs as soon as
personnel are available. See Section 5 of this SWPPP for contact information for
Ecology's ERTS and Boeing Emergency contact(Environmental Affairs).
• The SWPPP will be reviewed and appropriate revisions made within 7 days of the date
the discharge exceeded the benchmark.
• Immediately begin to fully implement and maintain appropriate source control and/or
treatment BMPs as soon as possible. The additional treatment BMPs should address
the problems within 10 days of the date the sample exceeded the benchmark value. If
installation of necessary treatment BMPs is not feasible within 10 days, Ecology may
approve additional time if requested within the initial 10-day response period.
• 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.
• Continue sampling daily at the monitoring points until the discharge turbidity is 25
NTU or less or the discharge stops or is eliminated.
14 November 2014
Boeing Renton 6'h Street Ditch Improvements SWPPP 19
Boeing Renton 6th Street Ditch Improvement Stormwater Pollution Prevention Plan
6.2.2 pH Sampling
The benchmark range for pH is 6.5 (minimum)to 8.5 (maximum) standard units, which are the
allowable discharge limit to surface waters of the state. pH analysis is required if construction
activity involves greater than 1,000 cubic yards of poured concrete or recycled concrete or
engineered soil,such as cement-treated base (CTB), cement kiln dust(CKD)or fly ash.
• Sampling and monitoring for pH will begin when concrete is first poured and exposed to
precipitation,and will continue weekly throughout and after the concrete pour and curing
period until fully cured(3 weeks from last pour)and discharges are documented to be
between pH 6.5 to 8.5 (standard units, su).
• Samples will be collected weekly at the monitoring point(see the Site Plan in Appendix
A) prior to discharge to the site closed conveyance storm drainage system, which outfalls
to Lake Washington.
• Samples will be analyzed for pH using pH strips and recorded in the site log book.
• For engineered soils, pH monitoring will begin when soils are first exposed to
precipitation. Weekly sampling will continue until the engineered soil area is fully
stabilized.
If a pH greater than 8.5 is measured at the monitoring point that has the potential to discharge
to the site stormwater system, which discharges to Lake Washington,the following steps will be
conducted:
1. Prevent(detain) all discharges from leaving the site and entering the site storm drains,
surface waters,or receiving water(Lake Washington).
2. Adjust or neutralize the high pH water until it is in the range of pH 6.5 to 8.5 (su) using
carbon dioxide(CO2) sparging or dry ice treatment in accordance with Ecology BMP
C252. Permittee (contractor) will obtain written approval from Ecology before using any
other form of chemical treatment other than CO2 sparging or dry ice.
3. Describe inspection results and remedial actions that are taken in the site log book.
Section 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 permit requirements;
including the installation and maintenance of BMPs;
• Site inspections; and,
• Stormwater quality monitoring.
14 November 2014
Boeing Renton 6th Street Ditch Improvements SWPPP 20
Boeing Renton 6th Street Ditch Improvement Stormwater Pollution Prevention Plan
For convenience, the inspection form and water quality monitoring forms included in this
SWPPP include the required information for the site log book.
7.1.2 Records Retention
Records of all monitoring information (site log book, inspection reports/checklists, sampling
results, calibration and maintenance records, 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 on the site at the construction trailer. All records as described
above will be submitted to the Boeing Company Environmental Affairs following the
termination of permit coverage.
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, Boeing Environmental Affairs personnel,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(General 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 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
Reporting to Ecology is done by the Boeing Company Environmental Affairs. Discharge
Monitoring Reports (DMRs)prepared by the contractor will be submitted to Environmental
Affairs monthly and Environmental Affairs personnel will submit to Ecology. If there is no
discharge during a given monitoring period,the contractor will submit the form as required with
the words"No discharge"entered in the place of monitoring results. DMRs shall be submitted
within seven (7)days following the end of each month.
14 November 2014
Boeing Renton 6th Street Ditch Improvements SWPPP 21
Boeing Renton 6m Street Ditch Improvement Storm water Pollution Prevention Plan
7.2.2 Notification of Noncompliance
If any of the terms and conditions of the permit is not met and the resulting noncompliance may
cause a threat to human health or the environment,the following steps will be taken in
accordance with permit(General Permit) section S5.F:
1. Immediately contact Boeing Construction Management, and second,
contact Environmental Affairs. If Boeing Construction Management and
Environmental Affairs personnel are not available,contact Ecology's
Northwest Region Environmental Report Tracking System (ERTS) within
twenty-four(24) hours. See Section 5.0 of this SWPPP for contact
information.
2. Immediate action shall be taken to prevent discharge from the project site,
to control or stop the noncompliance issue,and to correct the problem. If
applicable, sampling and analysis of any noncompliance shall be repeated
immediately and the results submitted to Boeing Environmental Affairs
within five(5)days of becoming aware of the violation.
3. A detailed written report describing the noncompliance shall be submitted
to Boeing Environmental Affairs within five (5)days, unless requested
earlier by Environmental Affairs or Ecology containing the following:
• Description of the noncompliance, including exact dates and time(if
possible)
• If the noncompliance has not been corrected,the anticipated date it is
expected to be corrected and the anticipated time it is expected to
continue
• Steps taken or planned to reduce,eliminate, and prevent reoccurrence
of the noncompliance
In accordance with permit(General Permit) condition S2.A, a complete application form shall be
submitted to Ecology and the appropriate local jurisdiction (if applicable)to be covered by the
General Permit.
14 November 2014
Boeing Renton 6th Street Ditch Improvements SWPPP 22
Boeing Renton 6th Street Ditch Improvement Stormwater Pollution Prevention Plan
Appendices
•
4 November 2014
Boeing Renton 6111 Street Ditch Improvements SWPPP 23
Boeing Renton 6th Street Ditch Improvement Stormwater Pollution Prevention Plan
Appendix A — Site Plans
• Overall Project Site Map
• Site and Utility Plan
• Drainage Basin Map
14 November 2014
Boeing Renton 6'h Street Ditch Improvements SWPPP A-I
Boeing Renton 6th Street Ditch Improvement Stormwater Pollution Prevention Plan
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Boeing Renton 6"' Street Ditch Improvement Stormwater Pollution Prevention Plan
Appendix B — Construction BMPs
• Plastic Covering(BMP C 123)
• • Storm Drain Inlet Protection (BMP C220)
• Nets and Blankets(BMP C122)
• Silt Fence BMP C233)
For construction BMPs: Purpose, Conditions of Use, Design and Installation
Specifications, and Maintenance Standards published by the Washington State
Department of Ecology, go to the website:
http://www.ecv.wa.gov/programs/wq/ston-nwater/2005manual.html
•
14 November 2014
Boeing Renton 6'h Street Ditch Improvements SWPPP B-1
Boeing Renton 6th Street Ditch Improvement Stormwater Pollution Prevention Plan
Appendix C — Alternative Construction BMPs
• None anticipated.
14 November 2014
Boeing Renton 6111 Street Ditch Improvements SWPPP C-1
Boeing Renton 6th Street Ditch Improvement Stormwater Pollution Prevention Plan
Appendix D — Construction Stormwater General
Permit
(To be inserted)
14 November 2014
Boeing Renton 6'Street Ditch Improvements SWPPP D-1
Boeing Renton 6th Street Ditch Improvement Stormwater Pollution Prevention Plan
Appendix E — Site Inspection Checklist (and Site
Log Book)
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.
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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 Construction
Stormwater General 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 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 General Permit(NPDES),the Permittee(contractor) 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
(contractor)shall comply with the Noncompliance Notification requirements in Special
Condition S5.F of the permit and notify Boeing Environmental Affairs as soon as possible.
•
•
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Site Inspection Form
General Information
Project Name:
Inspector Name: Title:
CESCL # :
Date: Time:
Inspection Type: ❑ After a rain event
o Weekly
o Turbidity/transparency benchmark exceedance
o Other
Weather
Precipitation Since last inspection In last 24 hours
Description of General Site Conditions:
Inspection of BMPs
Element 1: Mark Clearing Limits
BMP:
Inspected Functioning
Location Y N Y N NIP Problem/Corrective Action
BMP:
Inspected Functioning
Location Y N Y N NIP Problem/Corrective Action
Element 2: Establish Construction Access
BMP:
Inspected Functioning
LocationY N Y N NIP Problem/Corrective Action
BMP:
Inspected Functioning
Location Y N Y `N NIP Problem/Corrective Action
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Element 3: Control Flow Rates
BMP:
Location Inspected Functioning Problem/Corrective Action
Y N Y N NIP
BMP:
Inspected Functioning
Locationy N Y N NIP Problem/Corrective Action
Element 4: Install Sediment Controls
BMP:
Inspected Functioning
Location N Y N NIP Problem/Corrective Action
BMP:
Inspected Functioning
Location y N Y N NIP Problem/Corrective Action
BMP:
Location Inspected Functioning Problem/Corrective Action
Y N Y N NIP
BMP:
Inspected Functioning
Location y N Y N NIP Problem/Corrective Action
BMP:
Inspected Functioning
LocationY N Y N NIP Problem/Corrective Action
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Element 5: Stabilize Soils
BMP:
Inspected Functioning
Location Y N Y N NIP Problem/Corrective Action
BMP:
Inspected Functioning
Location Y N Y N NIP Problem/Corrective Action
BMP:
Inspected Functioning
Location Y N Y N NIP Problem/Corrective Action
BMP:
Inspected Functioning
Location Y N Y N NIP Problem/Corrective Action
Element 6: Protect Slopes
BMP:
Inspected Functioning
Location Y N Y N NIP Problem/Corrective Action
BMP:
Inspected Functioning
Location Y N Y N NIP Problem/Corrective Action
BMP:
Inspected Functioning
Location N Y N NIP Problem/Corrective Action
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Element 7: Protect Drain Inlets
BMP:
Inspected Functioning
Location` y N Y N NIP Problem/Corrective Action
BMP:
Inspected Functioning
Location y N Y N NIP Problem/Corrective Action
BMP:
Inspected Functioning
Location y N Y N NIP Problem/Corrective Action
Element 8: Stabilize Channels and Outlets
BMP:
Inspected Functioning
Location y N Y N NIP Problem/Corrective Action
BMP:
Location Inspected Functioning Problem/Corrective Action
Y N Y N NIP
BMP:
Inspected Functioning
Location y N Y N NIP Problem/Corrective Action
BMP:
Location Inspected Functioning Problem/Corrective Action
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Y N Y N NIP
Element 9: Control Pollutants
BMP:
Location Inspected Functioning Problem/Corrective Action
Y N Y N NIP
BMP:
Location Inspected Functioning Problem/Corrective Action
Y N Y N NIP
Element 10: Control Dewatering
BMP:
Location Inspected Functioning Problem/Corrective Action
Y N Y N NIP
BMP:
Inspected Functioning
Location Y N Y N NIP Problem/Corrective Action
BMP:
Location Inspected Functioning Problem/Corrective Action
Y N Y N NIP
Stormwater Discharges From the Site
Observed? Problem/Corrective Action
Y N
Location
Turbidity
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Discoloration
Sheen
Location
Turbidity
Discoloration
Sheen
Water Quality Monitoring
Was any water quality monitoring conducted? ❑ Yes ❑ 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?
❑ Yes ❑ 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? ❑ Yes ❑ No
If photos taken, describe photos below:
Sign Date
Print Name/Title
"I certify under penalty of law that this report is true, accurate, and complete, to the best of
my knowledge and belief."
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Appendix F - Engineering Calculations
Site Precipitation Values
Event Precip (in)
2 yr 24 hr 2.00
10 year 2.90
25 year 3.40
100 year I 3.90
NOTES/ASSUMPTIONS:
1. Precipitation rates were determined from isopluvial maps published in the 2009 King County
Surface Water Design Manual.
2. A fixed Tc of 5 minutes was used for this analysis.
3. The SBUH peak flow methodology using the StormShed 3G modeling program was used for
this analysis, and the below data was taken from the StormShed program.
4. Area considered for flows is the drainage area tributary to the site not just the site itself.
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TI Drainage Ditch Event Summary
Event Peak Q(cfs) I Peak T(hrs) Hyd Vol(acft) Area(ac) Method
2 yr 24 hr 0.3223 8.00 0.11 0.843 SBUH
10 year 0.498 8.00 0.1702 0.843 SBUH
25 year 0.5967 8.00 0.2041 0.843 SBUH
100 year I 0.6958 I 8.00 I 0.2383 I 0.843 I SBUH
All results based on storm duration of 24.0 hours.This is ok if all precipitations are appropriate for
the storm duration. If some design event precipitations are for different duration storms, those
results are incorrect
Record Id: TI Drainage Ditch
Design Method SBUH Rainfall type TYPEIA.RAC
Hyd Intv 10.00 min Peaking Factor 484.00
Storm Duration 24.00 hrs Abstraction Coeff 0.20
Pervious Area 0.19 ac DCIA 0.653 ac
Pervious CN 86.00 DC CN 98.00
Pervious TC I 5.00 min IDC TC I 5.00 min
Pervious CN Calc
Description SubArea Sub cn
Open spaces, lawns,parks(<50%grass) I 0.19 ac 86.00
I Pervious Composited CN (AMC 2) I 86.00
Pervious TC Calc
Type Description Length Slope Coeff Misc TT
Sheet I I 0.00 ft I 0.0% I 5.0 I 0.00 in 5.00 min
I Pervious TC I 5.00 min
DCI-CN Calc
Description SubArea Sub cn
Impervious surfaces(pavements, roofs,etc) I 0.653 ac 98.00
I DC Composited CN (AMC 2) I 98.00
DCI-TC Calc
Type Description Length Slope Coeff Misc TT
Sheet I I 0.00 ft I 0.0% I 5.0 I 0.00 in 5.00 min
IPervious TC i 5.00 min
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