HomeMy WebLinkAboutRS_SWPPP_Report_180522_v1.pdfWashington State Auto
Dealers Association (WSADA)
Renton Parking Lot
Construction Stormwater
Pollution Prevention Plan
Prepared for:
Washington State Auto
Dealers Association
621 SW Grady Way
Renton, WA 98057
Contact: Vicki Giles Fabré
Phone: (206) 433-6300
Prepared by:
Sitts & Hill Engineers, Inc.
4815 Center Street
Tacoma, Washington 98409
Contact: Kathy Hargrave, P.E.
Phone: (253) 474-9449
May 2018
S&H Job Number 17,668
Washington State Auto
Dealers Association (WSADA)
Renton Parking Lot
Stormwater
Pollution Prevention Plan
Prepared for:
Washington State Auto Dealers Association (WSADA)
621 SW Grady Way
Renton, WA 98057
Contact: Vicki Giles Fabré
Phone: (206) 433-6300
Prepared by:
Sitts & Hill Engineers, Inc.
4815 Center Street
Tacoma, Washington 98409
Contact: Kathy Hargrave P.E.
Phone: (253) 474-9449
May 2018 S&H Job Number 17,668
WSADA PARKING LOT
STORMWATER POLLUTION PREVENTION PLAN
SITTS & HILL ENGINEERS, INC. i
TACOMA, WASHINGTON
TABLE OF CONTENTS
1.0 Introduction ................................................................................................................... 1
2.0 Site Description ............................................................................................................. 2
2.1 Existing Conditions ........................................................................................................................... 2
2.2 Proposed Construction Activities – Site Improvements .............................................................. 2
3.0 Construction Stormwater BMPs .................................................................................. 3
3.1 The 12 BMP Elements ..................................................................................................................... 3
3.1.1 Element #1 – Clearing Limits ................................................................................................... 3
3.1.2 Element #2 – Cover Measures ................................................................................................. 3
3.1.3 Element #3 – Perimeter Protection .......................................................................................... 3
3.1.4 Element #4 – Traffic Area Stabilization ................................................................................... 4
3.1.5 Element #5 – Sediment Retention ........................................................................................... 4
3.1.6 Element #6 – Surface Water Collection .................................................................................. 4
3.1.7 Element #7 – Dewatering Control ............................................................................................ 4
3.1.8 Element #8 – Dust Control ........................................................................................................ 4
3.1.9 Element #9 – Flow Control ....................................................................................................... 5
3.1.10 Element #10 –Control Pollutants ........................................................................................... 5
3.1.11 Element #11 – Protect Existing and Proposed Stormwater Facilities & On-site BMPs . 6
3.1.12 Element #12 – Maintain Protective BMPs ............................................................................ 6
3.1.13 Element #13 – Manage the Project ....................................................................................... 6
4.0 Construction Phasing & Schedule.............................................................................. 9
5.0 Pollution Prevention Team ......................................................................................... 10
5.1 Roles and Responsibilities ............................................................................................................ 10
5.2 Team Members ............................................................................................................................... 10
6.0 Site Inspections and Monitoring ............................................................................... 11
6.1 Site Inspection ................................................................................................................................ 11
6.2 Site Inspection Frequency ............................................................................................................ 11
6.3 Site Inspection Documentation .................................................................................................... 11
6.4 Stormwater Quality Monitoring ..................................................................................................... 11
7.0 Reporting and Recordkeeping .................................................................................. 12
7.1 Recordkeeping ................................................................................................................................ 12
7.1.1 Site Log Book ........................................................................................................................... 12
7.1.2 Records Retention ................................................................................................................... 12
7.1.3 Access to Plans and Records ................................................................................................ 12
7.1.4 Updating the SWPPP .............................................................................................................. 12
7.1.5 Reporting .................................................................................................................................. 12
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APPENDIX
A Site Plans/Drawings
B Stormwater Calculations
C Construction BMPs
D Site Inspection Forms
REF 8-E CSWPPP Worksheet Forms
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1.0 INTRODUCTION
This Stormwater Pollution Prevention Plan (SWPPP) has been prepared as part of the 2017 City
of Renton Surface Water Design Manual (SWDM) requirements for the Washington State Auto
Dealers Association (WSADA) Renton Parking Lot project located in Renton, Washington.
The purpose of this SWPPP is to describe the proposed construction activities and the
associated temporary erosion and sediment control (TESC) measures, pollution prevention
measures, inspection/monitoring activities and record keeping that will be implemented during
the project. The objectives of the SWPPP are to:
· Implement Best Management Practices (BMPs) to prevent erosion and sedimentation,
and to identify, reduce, eliminate or prevent stormwater contamination and stormwater
pollution from construction activities.
· Prevent violations of surface water quality, ground water quality or sediment
management standards.
· Prevent adverse water quality impacts including those on beneficial uses of receiving
waters by controlling the flow of stormwater runoff leaving the site.
This SWPPP is for the WSADA Parking Lot project and is intended to be used in conjunction with
the Temporary Erosion and Sediment Control (TESC) plan(s) approved by the City of Renton.
Pertinent plans and site drawings are included after this narrative. Information in this SWPPP is
divided into the following sections:
· Section 1 – INTRODUCTION. This section provides a summary description of the
purpose and organization of the SWPPP document.
· Section 2 – SITE DESCRIPTION. This section provides a detailed description of the
existing site conditions, proposed construction activities, and stormwater flow
characteristics for existing conditions and post–construction conditions.
· Section 3 – CONSTRUCTION STORMWATER BMPs. This section provides a
detailed description of the BMPs to be implemented based on the 12
required elements of the SWPPP.
· Section 4 – CONSTRUCTION PHASING SCHEDULE. This section provides a description
of the timing of the BMP implementation in relation to the project schedule.
· Section 5 – POLLUTION PREVENTION TEAM. This section identifies the appropriate
contact names (emergency and non-emergency), monitoring personnel, and the on-
site temporary erosion and sedimentation control inspector
· Section 6 – SITE INSPECTIONS AND MONITORING. This section provides a
description of the inspection and monitoring requirements such as the parameters
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of concern, sample frequencies, and provides reference documents to aid in the
sampling methods for stormwater discharge.
· 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.
2.0 SITE DESCRIPTION
2.1 Existing Conditions
The existing site is 0.33 acre of undeveloped vacant land, located on Parcel 3340404805,
located at 620 Southwest 12th Street, Renton, WA 98057.
The subject site is located on 0.33 acre of vacant land consisting of grass, shrubs, and two trees
(6” Hawthorne and 3” Alder) along the eastern property line. The site is generally highest in
elevation in the center and slopes down towards the edges of the parcel (approximately 9 feet
of vertical drop). Upon examination of existing site conditions, runoff from the south side of
the site likely disperses across native vegetation, and runoff from the north side of the site
flows to the alley. Runoff entering the alley right of way is captured by an existing catch basin
conveying runoff to the City’s main. Based upon a review of available information on King
County GIS as well as a field visit, we are not aware of any capacity problems with the existing
drainage facilities adjacent to this area. The City of Renton’s Public Works Maps combined with
King County GIS together indicate the site is not located within or near any critical areas. The
project site is located within the Peak Rate Match Existing Flow Control Standard Zone. Sitts &
Hill Engineers is not aware of any problems with the existing drainage facilities serving this area.
2.2 Proposed Construction Activities – Site Improvements
The purpose of site improvements for this project is to create a suitable parking lot to
accommodate additional parking for Washington Auto Dealers Associations located
immediately north of the project site. Paved access, parking spots, and landscaping islands are
proposed on the site. There will be 32 stalls provided, two of which are van accessible ADA
stalls.
Stormwater runoff generated onsite will be provided with enhanced basic water quality
treatment via two Filterra® units before being conveyed to the City’s main.
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3.0 CONSTRUCTION STORMWATER BMPS
3.1 The 12 BMP Elements
The following section describes the BMPs that will be utilized onsite to meet the 2017 City of
Renton SWDM’s requirements. As noted in Section D.1.2 of the SWDM, BMP options may be
used and implemented in accordance with Core Requirement #5. To avoid potential erosion and
sediment control issues that may cause a violation(s), 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. City of
Renton’s installation and maintenance specifications for the BMPs discussed in this narrative
are also included in Appendix C.
3.1.1 Element #1 – Clearing Limits
In order to protect adjacent properties and to reduce the area of soil exposed to construction,
the limits of construction shall be clearly marked before land-disturbing activities begin.
Site specific BMPs:
· Mark Clearing Limits/Minimize Clearing
3.1.2 Element #2 – Cover Measures
Temporary and permanent cover measures shall be provided to protect all disturbed areas
undergoing construction, including the faces of cut and fill slopes. Temporary cover shall be
installed if an area is to remain unworked for more than seven days during the dry season (May
1 to September 30) or for more than two consecutive working days during the wet season
(October 1 to April 30). Any area to remain unworked for more than 30 days shall be seeded or
sodded, unless the City determines that winter weather makes vegetation establishment
infeasible. During the wet season, slopes and stockpiles at 3H:1V or steeper and with more than
ten feet of vertical relief shall be covered if they are to remain unworked for more than 12
hours. Also during the wet season, the material necessary to cover all disturbed areas must be
stockpiled onsite.
Site specific BMPs:
· Surface roughening
· Mulching
· Plastic Covering
· Temporary and Permanent Seeding
3.1.3 Element #3 – Perimeter Protection
Perimeter protection such as, but not limited to, silt fence shall be installed by the contractor
downslope of all disturbed areas and shall be installed prior to upslope grading.
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Site specific BMPs:
· Silt Fence
3.1.4 Element #4 – Traffic Area Stabilization
Unsurfaced entrances, roads, and parking areas used by construction traffic shall be stabilized to
minimize erosion and tracking of sediment offsite. Stabilized construction entrances shall be
installed as the first step in clearing and grading. Roads and parking areas shall be stabilized
immediately after initial grading.
Site specific BMPs:
· Stabilized Construction Entrance
· Construction Road/Parking Area Stabilization
3.1.5 Element #5 – Sediment Retention
Surface water collected from disturbed areas of the site shall be routed through a storm drain
inlet protection trap prior to release from the site. Exposed and unworked soils shall be
stabilized with the application of effective BMPs as outlined below to prevent erosion
throughout the life of the project. Per D2.1.5 of the City of Renton’s SWDM, the soils and site
topography are structured such that no offsite discharge of surface water are anticipated up to
and including the developed 2-year runoff event, therefore sediment ponds and traps are not
required.
Site specific BMPs:
· Storm Drain Inlet Protection
· Plastic Covering
· Dust Control
3.1.6 Element #6 – Surface Water Collection
Per D2.1.5 of the City of Renton’s SWDM, the soils and site topography are structured such that
no offsite discharge of surface water are anticipated up to and including the developed 2-year
runoff event, surface water controls are not required.
3.1.7 Element #7 – Dewatering Control
N/A. It is anticipated that dewatering will not be required onsite.
3.1.8 Element #8 – Dust Control
In order to minimize the wind transport of soils, dust control shall be implemented when
exposed soils are dry. The contractor shall use water for dust control. See Table D2.1.8.A of the
City of Renton SWDM. The exposed soils shall be sprayed until wet, but runoff shall not be
generated by spraying.
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3.1.9 Element #9 – Flow Control
This project does not propose to increase the existing site conditions 2-year and 10-year runoff
peak discharges. Therefore flow control is not required during construction.
3.1.10 Element #10 –Control Pollutants
All pollutants, including waste materials and demolition debris, that occur on-site 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.
Site Specific BMPs:
· Sawcutting and Surfacing Pollution Prevention
· Material Delivery, Storage and Containment
· Concrete Handling
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. 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.
Concrete:
· Process water and slurry resulting from concrete work shall be prevented from
entering the waters of the State by implementing Concrete Handling measures
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.
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3.1.11 Element #11 – Protect Existing and Proposed Stormwater Facilities & On-site BMPs
Protection measures as outlined in this Plan shall be applied/installed and maintained so as to
prevent adverse impacts to areas of proposed stormwater facilities and onsite BMPs for the
project. Stormwater facility and onsite BMP area protection shall be installed or otherwise
provided prior to any clearing and/or grading of the site, except that required to construct
stormwater facilities and onsite BMPs.
3.1.12 Element #12 – Maintain Protective 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.
Site specific BMPs:
· Materials on Hand
· Certified Erosion and Sediment Control Lead
3.1.13 Element #13 – Manage the Project
Erosion and sediment control BMPs for this project have been proposed 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 the site and maintain all ESC measures.
· Schedule major earthwork during the dry season.
Revegetation of exposed areas and maintenance of that vegetation shall be an integral part of
the clearing activities during each phase of construction, per the Scheduling BMP.
Seasonal Work Limitations:
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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 premitting authority that silt-laden runoff
will be prevented from leaving the site through a combination of the following:
· Site conditions including existing vegetative coverage, slope, soil type, and proximity
to receiving waters; and
· 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:
· 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
· Activities where there is 100 percent infiltration of surface water runoff within the
site in approved and installed erosion and sediment control facilities.
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:
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 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.
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· 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
stormwater 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.
Site Specific BMPs:
· Materials on Hand
· Certified Erosion and Sediment Control Lead
· Scheduling
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4.0 CONSTRUCTION PHASING & SCHEDULE
This project does not require phasing. The project is anticipated to take place during the 2018
calendar year.
The Contractor will coordinate all scheduling needed for the proposed construction. The
following typical construction sequence will be used:
1. Flag or otherwise mark the limits of construction.
2. Post sign with name and phone number of supervisor.
3. Install catch basin protection where required.
4. Install additional erosion control measures as indicated on the approved plans.
5. Maintain erosion control measures in accordance with the manufacturer's
recommendations during construction.
6. Clean the completed project area and conveyance system.
7. Remove all temporary BMPs.
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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.
· Owner Contact – individual that is the site owner or representative of the site
owner to be contacted in the case of an emergency
· Jurisdictional Contact – individual to be contacted at the local jurisdiction in case of
emergency
5.2 Team Members
Names and contact information for those identified as members of the pollution prevention
team are to be provided in the following table. Currently, each name is ‘TBD’.
Title Name(s) Phone Number
Contractor’s Certified Erosion and
Sediment Control Lead (CESCL)
Ecology Contact
Owner Contact
Local Jurisdiction Contact
Monitoring Personnel
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6.0 SITE INSPECTIONS AND MONITORING
Monitoring includes visual inspection, monitoring for water quality parameters of concern
(as necessary and per the requirements of the Construction Stormwater General Permit) 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
· Stormwater quality monitoring
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 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. The inspector will be a Certified Erosion and
Sediment Control Lead (CESCL). The name and contact information for the CESCL shall be
provided in Section 5 of this SWPPP.
Site inspection will ocurr 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 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.
6.2 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 stormwater from the site.
6.3 Site Inspection Documentation
The site inspector will record each site inspection using the site log inspection forms provided in
Appendix D. The site inspection log forms may be separated from this SWPPP document, but
shall be maintained on-site or within reasonable access to the site and be made available upon
request to Ecology or the local jurisdiction.
6.4 Stormwater Quality Monitoring
During construction, the quality of stormwater runoff will be monitored in accordance with the
requirements of the NPDES Construction General Permit.
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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;
• Site inspections
• Stormwater quality monitoring
For convenience, the inspection 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, 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 the Construction
Stormwater General Permit.
7.1.3 Access to Plans and Records
The SWPPP together with the Construction Stormwater General Permit shall be retained on site
or within reasonable access to the site and shall be made immediately available upon request to
Ecology or the local jurisdiction.
7.1.4 Updating the SWPPP
In accordance with the General Permit, this SWPPP will be modified if ineffective in eliminating
or mitigating pollutants in stormwater discharges from the site or if 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.
7.1.5 Reporting
Water Quality monitoring and reporting shall be performed in accordance with the NPDES
Construction General Permit for this project.
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Appendix A – Site Plans/Drawings
An 11x17 version of the proposed TESC plan has been included in this Appendix for easy
reference.
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Appendix B – Stormwater Calculations
The project does not propose an engineered temporary erosion control facility; therefore,
stormwater calculations have not been included in this report.
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Appendix C – Construction BMPs
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Appendix D – Site Inspection Forms
The results of each inspection and monitoring event shall be summarized in an inspection
report or checklist that is entered into or attached to the site log book. An Inspection Report
has been included in this appendix for reference. Completed inspection forms should be kept
on-site at all times during construction.
Inspections should be performed and documented as outlined below:
Inspection date/times
Weather information: general conditions during inspection, approximate amount of
precipitation since the last inspection, and approximate amount of precipitation within the last
24 hours.
A summary or list of all BMPs that have been implemented, including observations of all
erosion/sediment control structures or practices.
• Locations of BMPs that need maintenance,
• The reason maintenance is needed,
• Locations of BMPs that failed to operate as designed or intended, and
• Locations where additional or different BMPs are needed, and the reason(s) why
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.
A description of any water quality monitoring performed during inspection, and the results of
that monitoring.
General comments and notes, including a brief description of any BMP repairs, maintenance or
installations made as a result of the inspection.
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 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
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conditions. In addition, if the noncompliance causes a threat to human health or the
environment, the Permittee shall comply with the Noncompliance Notification requirements of
the General Permit.
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REFERENCE 8-E CWSPPP WORKSHEET FORMS
The CSWPPP Worksheet Forms included on the following pages will be completed per the 2017
Surface Water Design Manual.
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