HomeMy WebLinkAboutSWPPP-4136 i
Stormwater Pollution Prevention Plan
For 7th Street Short Plat
Prepared For
Jagadeshwar Gattu
Owner Developer Operator/Contractor
Jagadeshwar Gattu same as owner TBD
14716 NE 76th Street
Redmond, WA 98052
Project Site Location
3605 NE 7th Street
Renton, WA 98056
Certified Erosion and Sediment Control Lead
TBD
SWPPP Prepared By
Lori L. Harvey, CESCL
Senior Land Planner - Special Projects
Senior Site Inspector
SWPPP Preparation Date
June 29, 2020
Revised September 17, 2020
Approximate Project Construction Dates
November 15, 2020 through June 1, 2021
DEVELOPMENT ENGINEERING
Nathan Janders 05/25/2021
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Contents
1.0 Introduction ...............................................................................................................................1
2.0 Site Description ........................................................................................................................3
2.1 Existing Conditions ...........................................................................................................3
2.2 Proposed Construction Activities ......................................................................................3
3.0 Construction Stormwater BMPs ...............................................................................................5
3.1 The 13 BMP Elements .......................................................................................................5
3.1.1 Element #1 – Mark Clearing Limits ...................................................................5
3.1.2 Element #2 – Establish Construction Access .....................................................5
3.1.3 Element #3 – Control Flow Rates.......................................................................6
3.1.4 Element #4 – Install Sediment Controls .............................................................7
3.1.5 Element #5 – Stabilize Soils ...............................................................................9
3.1.6 Element #6 – Protect Slopes .............................................................................10
3.1.7 Element #7 – Protect Drain Inlets.....................................................................12
3.1.8 Element #8 – Stabilize Channels and Outlets ...................................................13
3.1.9 Element #9 – Control Pollutants .......................................................................14
3.1.10 Element #10 – Control Dewatering .................................................................17
3.1.11 Element #11 – Maintain BMPs .......................................................................19
3.1.12 Element #12 – Manage the Project ..................................................................19
3.1.13 Element #13 Protect Low Impact Development BMPS ....................................22
3.2 Site Specific BMPs ...........................................................................................................23
3.3 Additional Advanced BMPs .............................................................................................23
4.0 Construction Phasing and BMP Implementation .............................................................23
5.0 Pollution Prevention Team ......................................................................................................24
5.1 Roles and Responsibilities ...............................................................................................24
5.2 Team Members ................................................................................................................25
6.0 Site Inspections and Monitoring .............................................................................................26
6.1 Site Inspection .................................................................................................................26
6.1.1 Site Inspection Frequency ................................................................................27
6.1.2 Site Inspection Documentation .........................................................................27
6.2 Stormwater Quality Monitoring ......................................................................................27
6.2.1 Turbidity Sampling ...........................................................................................27
7.0 Reporting and Recordkeeping ................................................................................................30
7.1 Recordkeeping .................................................................................................................30
7.1.1 Site Log Book ...................................................................................................30
7.1.2 Records Retention.............................................................................................31
7.1.3 Access to Plans and Records ............................................................................31
7.1.4 Updating the SWPPP ........................................................................................31
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7.2 Reporting .........................................................................................................................31
7.2.1 Discharge Monitoring Reports .........................................................................31
7.2.2 Notification of Noncompliance ........................................................................31
Appendix A – Site Plans .........................................................................................................33
Appendix B - Spill Prevention, Control, and Countermeasure (SPCC) Plan .........................34
Appendix C – Environment Constraints and Impaired Body Conditions ..............................35
Appendix D – General Permit ................................................................................................36
Appendix E – Site Inspection Forms (and Site Log) ..............................................................37
Appendix F – Reports and Engineering Calculations .............................................................39
Appendix G – Best Management Practices (BMPs) ...............................................................40
Appendix A Site plans
Appendix B Spill Prevention, Control, and Countermeasure (SPCC) Plan
Appendix C Environmental Constraints and Impaired Body Conditions
Appendix D General Permit
Appendix E Site Log and Inspection Forms
Appendix F Reports and Engineering Calculations
Appendix G Best Management Practices
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1.0 Introduction
The introduction should include the following information:
Project site name
Brief site description
Brief description of the proposed project (what/when)
Proposed objective of the SWPPP (SWPPP objectives 1-3)
Reference to the Stormwater Manual used in preparation of the SWPPP
Organization of the SWPPP
The project, 7th Street Short Plat is the formal platting of one existing tax parcel into 3 single
family residential lots.
The project is not subject to coverage under the Construction General Stormwater Permit as
administered by Ecology as it is under 1 acre in size. For the purposes of this SWPPP all 0.64
acres will be considered disturbed.
The purpose of this SWPPP is to describe the proposed construction activities and all temporary
and permanent erosion and sediment control (TESC) measures, pollution prevention measures,
inspection/monitoring activities, and recordkeeping that will be implemented during the
proposed construction project. The objectives of the SWPPP are to:
1. Implement Best Management Practices (BMPs) to prevent erosion and
sedimentation, and to identify, reduce, eliminate or prevent stormwater
contamination and water pollution from construction activity.
2. Prevent violations of surface water quality, ground water quality, or
sediment management standards.
3. Prevent, during the construction phase, adverse water quality impacts
including impacts on beneficial uses of the receiving water by controlling
peak flow rates and volumes of stormwater runoff at the Permittee’s
outfalls and downstream of the outfalls.
This SWPPP was prepared based on the requirements set forth in the Construction Stormwater
General Permit and to the design standards of 2017 City of Renton Surface Water Design
Manual and its amendments to the 2016 King County Surface Water Design Manual. The
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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.
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.
Section 3 – CONSTRUCTION BMPs. This section provides a detailed
description of the BMPs to be implemented based on the 12 required
elements of the SWPPP (SWMMEW 2004).
Section 4 – CONSTRUCTION PHASING AND BMP
IMPLEMENTATION. 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 onsite temporary erosion and sedimentation
control inspector
Section 6 – 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 all stormwater discharge locations
from the site.
Section 7 – 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 – Spill Prevention, Control, and Countermeasure (SPCC) Plan
Appendix C – Environmental Constraints and Impaired Body Conditions
Appendix D – General Permit
Appendix E – Site Log and Inspection Forms
Appendix F – Reports and Engineering Calculations
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2.0 Site Description
2.1 Existing Conditions
Description of Site (location, size, existing structure, topography, typical soil and groundwater
characteristics):
The 7th Street Short Plat project is located at 3605 NE 7th Street, Renton, WA 98056, in the
jurisdictional boundary of the City of Renton (King County Tax Parcel# 8011100135).
The 0.64 acre site is best described as rectangular and contains one single family home with
associated out buildings. All existing structure are to be proposed to be demolished.
The site slopes from the east to the west at an approximate gradient ranging from 5% to 10%
with isolated areas up to 30%.
According to Natural Resources Conservation Service (NRCS), site soils consist of Arents,
Alderwood material, 6 to 15 percent slopes. According to the Geotechnical report conducted by
Earth Solutions NW, LLC (ESNW) on August 20, 2018, the native soils were classified
primarily as silty sand with gravel, consistent with the typical makeup of glacial till deposits
Description of drainage (on site runoff conveyance and downstream receiving water bodies and
drainage systems):
Under both preexisting and post developed conditions stormwater flows southwesterly to an
exisiting conveyance system located in NE 7th Place. From NE 7th Place, runoff continues
through an existing closed conveyance system with eventual discharge to Cedar River,
tributary to Lake Washington.
Description of critical areas (high erosion risk areas, wetland/stream/shoreline areas, steep slopes
and landslide prone areas):
There are no identifed critial areas on site.
2.2 Proposed Construction Activities
Provide the following mandatory information in the narrative section below:
Description of site development
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Description of construction activities
Description of site drainage
Description of final site soil stabilization, revegetation, etc
Site development will include but may not be limited to: setting clearing limits, installation of
BMPs, logging, clearing, grading, construction of right of way and right of way peripherals
(curb, gutters, asphalt, mailboxes, street lighting, street signage and striping), construction of
utilities (electricity, cable, phone, storm, sewer, water), followed by home construction.
No runof peak flows were calculated for this project. The following section includes data
when available
The following summarizes details regarding site areas:
Total site area: 0.64 acres
Percent impervious area before construction: +/- 10%
Percent impervious area after construction (Averaged) 29.86 %
Disturbed area during construction: 0.64acres
Disturbed area that is characterized as impervious (i.e.,
access roads, staging, parking): +/- 0.05 acres
2-year stormwater runoff peak flow prior to construction
(existing): NAcfs
10-year stormwater runoff peak flow prior to construction
(existing): NAcfs
2-year stormwater runoff peak flow during construction: NAcfs
10-year stormwater runoff peak flow during construction: NAcfs
2-year stormwater runoff peak flow after construction: NAcfs
10-year stormwater runoff peak flow after construction: NAcfs
All stormwater flow calculations are provided in Appendix F.
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3.0 Construction Stormwater BMPs
3.1 The 13 BMP Elements
3.1.1 Element #1 – Mark Clearing Limits
To protect adjacent properties and to reduce the area of soil exposed to construction, the limits of
construction will be clearly marked before land-disturbing activities begin. Trees that are to be
preserved, as well as all sensitive areas and their buffers, shall be clearly delineated, both in the
field and on the plans. In general, natural vegetation and native topsoil shall be retained in an
undisturbed state to the maximum extent possible. The BMPs relevant to marking the clearing
limits that will be applied for this project include:
Preserving Natural Vegetation (BMP C101)
Buffer Zones (BMP C102)
High Visibility Plastic or Metal Fence (BMP C103)
Silt Fence (BMP C233)
Alternate BMPs have been left unchecked above. To avoid potential erosion and sediment
control issues that may cause a violation(s) of the NPDES Construction Stormwater permit (as
provided in Appendix D), the Certified Erosion and Sediment Control Lead will promptly initiate
the implementation of one or more of the alternative BMPs listed above after the first sign that
existing BMPs are ineffective or failing.
3.1.2 Element #2 – Establish Construction Access
Construction access or activities occurring on unpaved areas shall be minimized, yet where
necessary, access points shall be stabilized to minimize the tracking of sediment onto public
roads, and wheel washing, street sweeping, and street cleaning shall be employed to prevent
sediment from entering state waters. All wash wastewater shall be controlled on site. The
specific BMPs related to establishing construction access that will be used on this project
include:
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Stabilized Construction Entrance (BMP C105)
Wheel Wash (BMP C106)
Construction Road/Parking Area Stabilization (BMP C107)
Alternate BMPs have been left unchecked above. To avoid potential erosion and sediment
control issues that may cause a violation(s) of the NPDES Construction Stormwater permit (as
provided in Appendix D), the Certified Erosion and Sediment Control Lead will promptly initiate
the implementation of one or more of the alternative BMPs listed above after the first sign that
existing BMPs are ineffective or failing.
3.1.3 Element #3 – Control Flow Rates
To protect the properties and waterways downstream of the project site, stormwater discharges
from the site will be controlled. The specific BMPs for flow control that shall be used on this
project include:
Sediment Trap (BMP C240)
Water Bars (BMP C203)
Check Dams (BMP C207)
Outlet Protection (BMP C209)
Wattles (BMP C235)
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Temporary Sediment Pond (BMP C241)
Alternate BMPs have been left unchecked above. To avoid potential erosion and sediment
control issues that may cause a violation(s) of the NPDES Construction Stormwater permit (as
provided in Appendix D), the Certified Erosion and Sediment Control Lead will promptly initiate
the implementation of one or more of the alternative BMPs listed above after the first sign that
existing BMPs are ineffective or failing.
The project site is located west of the Cascade Mountain Crest. As such, the project must
comply with Minimum Requirement 7 (Ecology ).
In general, discharge rates of stormwater from the site will be controlled where increases in
impervious area or soil compaction during construction could lead to downstream erosion, or
where necessary to meet local agency stormwater discharge requirements.
3.1.4 Element #4 – Install Sediment Controls
All stormwater runoff from disturbed areas shall pass through an appropriate sediment removal
BMP before leaving the construction site or prior to being discharged to an infiltration facility.
The specific BMPs to be used for controlling sediment on this project include:
Brush Barrier (BMP C231)
Gravel Filter Berm (BMP C232)
Silt Fence (BMP C233)
Vegetated Strip (BMP C234)
Wattles (BMP C235)
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Sediment Trap (BMP C240)
Temporary Sediment Pond (BMP C241)
Construction Stormwater Chemical Treatment (BMP C250)
Construction Stormwater Filtration (BMP C251)
Alternate BMPs have been left unchecked above. To avoid potential erosion and sediment
control issues that may cause a violation(s) of the NPDES Construction Stormwater permit (as
provided in Appendix D), the Certified Erosion and Sediment Control Lead will promptly initiate
the implementation of one or more of the alternative BMPs listed above after the first sign that
existing BMPs are ineffective or failing.
In addition, sediment will be removed from paved areas in and adjacent to construction work
areas manually or using mechanical sweepers, as needed, to minimize tracking of sediments on
vehicle tires away from the site and to minimize washoff of sediments from adjacent streets in
runoff.
Whenever possible, sediment laden water shall be discharged into onsite, relatively level,
vegetated areas (BMP C240 paragraph 5, page 4-102).
In some cases, sediment discharge in concentrated runoff can be controlled using permanent
stormwater BMPs (e.g., infiltration swales, ponds, trenches). Sediment loads can limit the
effectiveness of some permanent stormwater BMPs, such as those used for infiltration or
biofiltration; however, those BMPs designed to remove solids by settling (wet ponds or detention
ponds) can be used during the construction phase. When permanent stormwater BMPs will be
used to control sediment discharge during construction, the structure will be protected from
excessive sedimentation with adequate erosion and sediment control BMPs. Any accumulated
sediment shall be removed after construction is complete and the permanent stormwater BMP
will be restabilized with vegetation per applicable design requirements once the remainder of the
site has been stabilized.
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3.1.5 Element #5 – Stabilize Soils
Exposed and unworked soils shall be stabilized with the application of effective BMPs to prevent
erosion throughout the life of the project. The specific BMPs for soil stabilization that shall be
used on this project include:
Temporary and Permanent Seeding (BMP C120)
Mulching (BMP C121)
Nets and Blankets (BMP C122)
Plastic Covering (BMP C123)
Sodding (BMP C124)
Topsoiling/Composting (BMP C125)
Polyacrylamide for Soil Erosion Protection (BMP C126)
Surface Roughening (BMP C130)
Gradient Terraces (BMP C131)
Dust Control (BMP C140)
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Early application of gravel base on areas to be paved
Materials on Hand (BMP C150) may also be applicable.
Alternate BMPs have been left unchecked above. To avoid potential erosion and sediment
control issues that may cause a violation(s) of the NPDES Construction Stormwater permit (as
provided in Appendix D), the Certified Erosion and Sediment Control Lead will promptly initiate
the implementation of one or more of the alternative BMPs listed above after the first sign that
existing BMPs are ineffective or failing.
The project site is located west of the Cascade Mountain Crest. As such, no soils shall remain
exposed and unworked for more than 7 days during the dry season (May 1 to September 30) and
2 days during the wet season (October 1 to April 30). Regardless of the time of year, all soils
shall be stabilized at the end of the shift before a holiday or weekend if needed based on weather
forecasts.
The In general, cut and fill slopes will be stabilized as soon as possible and soil stockpiles will be
temporarily covered with plastic sheeting. All stockpiled soils shall be stabilized from erosion,
protected with sediment trapping measures, and where possible, be located away from storm
drain inlets, waterways, and drainage channels.
3.1.6 Element #6 – Protect Slopes
All cut and fill slopes will be designed, constructed, and protected in a manner that minimizes
erosion. The following specific BMPs will be used to protect slopes for this project:
Temporary and Permanent Seeding (BMP C120)
Mulching (BMP C121)
Nets and Blankets (BMP C122)
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Surface Roughening (BMP C131)
Gradient Terraces (BMP C131)
Interceptor Dike and Swale (BMP C200)
Grass-Lined Channels (BMP C201)
Water Bars (BMP C203)
Pipe Slope Drains (BMP C204)
Subsurface Drains (BMP C205)
Level Spreader (BMP C206)
Check Dams (BMP C207)
Triangular Silt Dike (Geotextile-Encased Check Dams) (BMP C208)
Plastic sheeting may be used on cut slopes. See construction plans for King County detail
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Alternate BMPs have been left unchecked above. To avoid potential erosion and sediment
control issues that may cause a violation(s) of the NPDES Construction Stormwater permit (as
provided in Appendix D), the Certified Erosion and Sediment Control Lead will promptly initiate
the implementation of one or more of the alternative BMPs listed above after the first sign that
existing BMPs are ineffective or failing.
3.1.7 Element #7 – Protect Drain Inlets
All storm drain inlets and culverts made operable during construction shall be protected to
prevent unfiltered or untreated water from entering the drainage conveyance system. However,
the first priority is to keep all access roads clean of sediment and keep street wash water separate
from entering storm drains until treatment can be provided. Storm Drain Inlet Protection (BMP
C220) will be implemented for all drainage inlets and culverts that could potentially be impacted
by sediment-laden runoff on and near the project site. The following inlet protection measures
will be applied on this project:
Drop Inlet Protection
Excavated Drop Inlet Protection
Block and Gravel Drop Inlet Protection
Gravel and Wire Drop Inlet Protection
Catch Basin Filters
Alternative BMP not included in the SWMMWW (2012) SWMMEW (2004)
Curb Inlet Protection
Wooden Weir
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Block and Gravel Inlet Protection
Alternative BMP not included in SWMMWW (2012)
Culvert Inlet Protection
Culvert Inlet Sediment Trap
Alternative BMP not included in SWMMWW (2012)
Alternate BMPs have been left unchecked above. To avoid potential erosion and sediment
control issues that may cause a violation(s) of the NPDES Construction Stormwater permit (as
provided in Appendix D), the Certified Erosion and Sediment Control Lead will promptly initiate
the implementation of one or more of the alternative BMPs listed above after the first sign that
existing BMPs are ineffective or failing.
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:
Channel Lining (BMP C202)
Nets and Blankets (BMP C122)
Check Dams (BMP C207)
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Outlet Protection (BMP C209)
Alternate BMPs have been left unchecked above. To avoid potential erosion and sediment
control issues that may cause a violation(s) of the NPDES Construction Stormwater permit (as
provided in Appendix D), the Certified Erosion and Sediment Control Lead will promptly initiate
the implementation of one or more of the alternative BMPs listed above after the first sign that
existing BMPs are ineffective or failing.
The project site is located west of the Cascade Mountain Crest. As such, all temporary on-site
conveyance channels shall be designed, constructed, and stabilized to prevent erosion from the
expected peak 10 minute velocity of flow from a Type 1A, 10-year, 24-hour recurrence interval
storm for the developed condition. Alternatively, the 10-year, 1-hour peak flow rate indicated by
an approved continuous runoff simulation model, increased by a factor of 1.6, shall be used.
Stabilization, including armoring material, adequate to prevent erosion of outlets, adjacent
streambanks, slopes, and downstream reaches shall be provided at the outlets of all conveyance
systems.
3.1.9 Element #9 – Control Pollutants
All pollutants, including waste materials and demolition debris, that occur onsite shall be
handled and disposed of in a manner that does not cause contamination of stormwater. Good
housekeeping and preventative measures will be taken to ensure that the site will be kept clean,
well organized, and free of debris. If required, BMPs to be implemented to control specific
sources of pollutants are discussed below.
Concrete Handling (BMP C151)
Sawcutting and Surfacing Pollution Prevention (BMP C152)
Material Delivery, Storage and Containment (BMP C153)
Concrete Washout Area (BMP C154)
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Construction Stormwater Chemical Treatment (BMP C250)
Construction Stormwater Filtration (BMP C251)
High pH Neutralization Using CO2 (BMP C252)
pH Control for High pH Water (BMP C253)
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.
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,
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containment, and protection provided on site, Per BMP C153 for Material
Delivery, Storage and Containment in SWMMWW 2012
Application of agricultural chemicals, including fertilizers and pesticides
shall be conducted in a manner and at application rates that will not result
in loss of chemical to stormwater runoff. Manufacturers’
recommendations for application procedures and rates shall be followed.
Excavation and tunneling spoils dewatering waste:
Dewatering BMPs and BMPs specific to the excavation and tunneling
(including handling of contaminated soils) are discussed under Element 10
Demolition:
Dust released from demolished sidewalk. Building, or structures will be
controlled using Dust Control Measures (BMP C140)
Storm drain inlets vulnerable to stormwater discharge carrying dust, soil,
or debris will be protected using Storm Drain Inlet Protection (BMP C220
as described in Element 7).
Process water and slurry resulting from sawcutting and surfacing
operations will be prevented from entering the waters of the State by
implementing Sawcutting and surfacing Pollution Prevention measures
(BMP C152)
Concrete and grout:
Process water and slurry resulting from concrete work will be prevented
from entering the waters of the State by implementing Concrete Handling
measures (BMP C151)
Sanitary wastewater:
Portable sanitation facilities will be firmly secured, regularly maintained,
and empties when necessary
Wheel wash or tire bath wastewater shall be discharged to a separate on-
site treatment system or to the sanitary sewer as part of the Wheel Wash
Implementation (BMP C106)
Solid waste:
Solid waste will be stored in secure, clearly marked containers
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Other:
Other BMPs will be administered as necessary to address any additional
pollutant sources on site.
The facility:
IS transportation-related and therefore subject to the criteria for determining if a Spill
Prevention, Control, and Countermeasure (SPCC) Plan is required under the Federal regulations
of the Clean Water Act (CWA). If applicable, the Contractor shall prepare an SPCC Plan
according to the Washington State Department of Transportation (WSDOT) Requirements (see
the WASDOT Standards Specifications for Road, Bridge, and Municipal Construction 2004).
See Appendix C for the SPCC Plan and requirements.
As per the Federal regulations for the Clean Water Act (CWA) and according to the Final Rule
40 CFR Part 112, as stated in the National Register, a Spill Prevention, Control, and
Countermeasure (SPCC) Plan is required for construction activities. A SPCC Plan has been
prepared to address an approached to prevent, respond to, and report spills or releases to the
environment that could result from construction activities. This Plan must:
Be well thought out in accordance with good engineering;
Achieve three objectives – prevent spills, contain a spill that occurs, and clean up the
spill;
Identify the name, location, owner, and type of facility;
Include the date of initial operation and oil spill history;
Name the designated person responsible;
Show evidence of approval and certification by the person in authority; and
Contain a facility analysis
IS NOT transportation related and therefore will not require a Spill Prevention, Control, and
Countermeasure (SPCC) Plan under the Federal regulations of the Clean Water Act (CWA).
3.1.10 Element #10 – Control Dewatering
All dewatering water from open cut excavation, tunneling, foundation work, trench, or
underground vaults shall be discharges into a controlled conveyance system prior to discharge to
the sediments trap or sediment pond. Channels will be stabilized, per Element #8. Clean, non-
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turbid dewatering water will not be routed through stormwater sediment ponds, and will be
discharges to systems tributary to the receiving waters of the State in a manner that does not
cause erosion, flooding, or a violation of State water quality standards in the receiving water.
Highly turbid dewatering water from soils known or suspected to be contaminated, or from use
of construction equipment, will require additional monitoring a treatment as required for the
specific pollutants based on the receiving waters into which the discharge is occurring. Such
monitoring is the responsibility of the contractor
However, the dewatering of soils known to be free of contamination will trigger BMPs to trap
sediment and reduce turbidity. At a minimum, Geotextile fabric socks/bags/cells will be used to
filter this material. Other BMPs to be used for sediment trapping and turbidity reduction include
the following:
Concrete Handling (BMP C151)
Temporary Sediment Pond (BMP C241)
Construction Stormwater Chemical Treatment (BMP C250)
Construction Stormwater Filtration (BMP C251)
Infiltration
Use of sedimentation bag, with outfall to a ditch or swale for small volumes of
water
Water Bars (BMP C203)
Vegetation Filtration (BMP C236)
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No dewatering is proposed nor anticipated
Alternate BMPs have been left unchecked above. To avoid potential erosion and sediment
control issues that may cause a violation(s) of the NPDES Construction Stormwater permit (as
provided in Appendix D), the Certified Erosion and Sediment Control Lead will promptly initiate
the implementation of one or more of the alternative BMPs listed above after the first sign that
existing BMPs are ineffective or failing.
3.1.11 Element #11 – Maintain BMPs
All temporary and permanent erosion and sediment control BMPs shall be maintained and
repaired as needed to assure continued performance of their intended function. Maintenance and
repair shall be conducted in accordance with each BMP specification (attached). 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 site becomes inactive, and is
temporarily stabilized, the inspection frequency will be reduced to once every month.
All temporary erosion and sediment control BMPs shall be removed within 30
days after the final site stabilization is achieved or after the temporary BMPs are
no longer needed. Trapped sediment shall be removed or stabilized on site.
Disturbed soil resulting from removal of BMPs or vegetation shall be
permanently stabilized.
Materials on Hand (BMP C150)
Certified Erosion and Sediment Control Lead (BMP C160)
3.1.12 Element #12 – Manage the Project
Erosion and sediment control BMPs for this project have been designed based on the following
principles:
Design the project to fit the existing topography, soils, and drainage
patterns.
Emphasize erosion control rather than sediment control.
Minimize the extent and duration of the area exposed.
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Keep runoff velocities low.
Retain sediment on site.
Thoroughly monitor site and maintain all ESC measures.
Schedule major earthwork during the dry season.
In addition, project management will incorporate the key components listed below:
As this project site is located west of the Cascade Mountain Crest, the project will be managed
according to the following key project components:
Phasing of Construction
The construction project is being phased to the extent practicable to
prevent soil erosion, and, to the maximum extent possible, the transport of
sediment from the site during construction.
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 (C 162).
Seasonal Work Limitations
From October 1 through April 30, clearing, grading, and other soil
disturbing activities shall only be permitted if shown to the satisfaction of
the local permitting authority that silt-laden runoff will be prevented from
leaving the site through a combination of the following:
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:
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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.
Coordination with Utilities and Other Jurisdictions
Care has been taken to coordinate with utilities, other construction
projects, and the local jurisdiction in preparing this SWPPP and
scheduling the construction work.
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:
Assess the site conditions and construction activities that could
impact the quality of stormwater, and
Assess the effectiveness of erosion and sediment control measures
used to control the quality of stormwater discharges.
A Certified Erosion and Sediment Control Lead shall be on-site or on-call
always.
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.
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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.
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.
3.1.13 Element #13 Protect Low Impact Development BMPS
Buffer Zone (BMP C102)
High Visibility Fence (BMP C103)
Interceptor Dike and Swale (BMP C200)
Grass-Lined Channels (BMP C201)
Check Dams (BMP C207)
Triangular Silt Dike (TSD) (Geotextile-Encased Check Dams) (BMP C208)
Brush Barrier (BMP C231)
Silt Fence (BMP C233)
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Vegetated Strip (BMP C234)
The project is not subject to LID
3.2 Site Specific BMPs
Site specific BMPs are shown on the TESC Plan sheets and details in Appendix A. These site-
specific plan sheet will be updated annually.
All BMPs unchecked are to be considered as alternative and subject to field change
3.3 Additional Advanced BMPs
The following BMPS are advances and are only recommend if construction activities are
complex enough to warrant the; or if the site has the potential for significant impact to water
quality. The following BMPs are directed at end of pipe treatment for sedimentation issues
related to turbid runoff from construction sites. Effective BMPs are most often the simple
BMPs, and focus on the minimization of erosion before sedimentation is an issue. The following
BMPs will most likely be implemented only after other BMP options are exhausted, or if the
construction activity is large and off-site sedimentation or turbid run off occur or is inevitable.
BMP 250: Use of BMP 250 requires written pre-approval through Ecology
BMP C250: Construction Stormwater Chemical Treatment
BMP C250: Construction Stormwater Filtration
4.0 Construction Phasing and BMP Implementation
The following section requires site specific information based on the BMPs selected in Section 3.
Some upfront schedule information was input from the SWPPP Wizard, but additional site-
specific dates and scheduling information is required. This section must convey key information
on the project schedule and how the BMPs will be implemented within the schedule.
The BMP implementation schedule will be driven by the construction schedule. The following
provides a sequential list of the proposed construction schedule milestones and the corresponding
BMP implementation schedule. The list contains key milestones such as wet season
construction.
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The BMP implementation schedule listed below is keyed to proposed phases of the construction
project, and reflects differences in BMP installations and inspections that relate to wet season
construction. The project site is located west of the Cascade Mountain Crest. As such, the dry
season is from May 1 to September 30 and the wet season is from October 1 to April 30.
The following construction sequence timing is based upon an estimate of activities:
Arrange and Attend Preconstruction Meeting Day 1
Flag and fence clearing limits Day 2-5
Install filter fabric fence Day 6
Install construction entrance Day 7
Preserve and protect all wetlands and buffers Day 8-9
Install Erosion Control measures Day 9-10
Clear and grade site Day 11-31
Construct Storm Facilities Day 31-51
Install Sewer, water and dry utilities Day 51-61
Install Catch Basins and conveyance pipes Day 61-71
Construct roof and yard drains Day 61-71
Install concrete curb Day 71-75
Remove construction entrance, asphalt road Day 75-80
Construct Sidewalk Day 80-83
Call for inspections Day 85
Begin home construction Day 90
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
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monitoring, sampling, etc.); to be called upon in case of failure of any
ESC measures.
Resident Engineer – For projects with engineered structures only
(sediment ponds/traps, sand filters, etc.): site representative for the owner
that is the project's supervising engineer responsible for inspections and
issuing instructions and drawings to the contractor's site supervisor or
representative
Emergency Ecology Contact – individual to be contacted at Ecology in
case of emergency. Go to the following website to get the name and
number for the Ecology contact information:
http://www.ecy.wa.gov/org.html.
Emergency Owner Contact – individual that is the site owner or
representative of the site owner to be contacted in the case of an
emergency.
Non-Emergency Ecology Contact – individual that is the site owner or
representative of the site owner than can be contacted if required.
Monitoring Personnel – personnel responsible for conducting water
quality monitoring; for most sites this person is also the Certified Erosion
and Sediment Control Lead.
5.2 Team Members
Names and contact information for those identified as members of the pollution prevention team
are provided in the following table.
Title Name(s) Phone Number
Certified Erosion and Sediment Control Lead
(CESCL)
Lori L Harvey, CES NW, Inc 253.241.2846
Monitoring Personnel CES NW, Inc 253.848-4282
Resident Engineer Cara Visintainer, PE, CES NW, Inc 253-848-4282
Site Foreman/Superintendent/Contact Vladimir Tkach, AVT Services, LLC 253-579-8018
Emergency Owner Contact Vladimir Tkach
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Ecology Contact: Permit Administrator Josh Klimek, 360.407.7451
Ecology Contact: Emergency Southwest Regional Office 360.407.6300
Jurisdictional Inspector: Pierce County Sam Knox 253.370.7052
OtherEcology Inspector Jess Eakins 360.407.0246
6.0 Site Inspections and Monitoring
Monitoring includes visual inspection, monitoring for water quality parameters of concern and
documentation of the inspection and monitoring findings in a site log book. A site log book will
be maintained for all on-site construction activities and will include:
A record of the implementation of the SWPPP and other permit
requirements;
Site inspections; and,
Stormwater quality monitoring.
For convenience, the inspection form and water quality monitoring forms included in this
SWPPP include the required information for the site log book. This SWPPP may function as the
site log book if desired, or the forms may be separated and included in a separate site log book.
However, if separated, the site log book but must be maintained on-site or within reasonable
access to the site and be made available upon request to Ecology or the local jurisdiction.
6.1 Site Inspection
All BMPs will be inspected, maintained, and repaired as needed to assure continued performance
of their intended function. The inspector will be a Certified Erosion and Sediment Control Lead
(CESCL) per BMP C160. The name and contact information for the CESCL is provided in
Section 5 of this SWPPP.
Site inspection will occur in all areas disturbed by construction activities and at all 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.
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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 will record each site inspection using the site log inspection forms provided in
Appendix E. The site inspection log forms may be separated from this SWPPP document, but
will be maintained on-site or within reasonable access to the site and be made available upon
request to Ecology or the local jurisdiction.
6.2 Stormwater Quality Monitoring
This site (check all that apply)
IS LESS than 1 acre
IS GREATER than 1 acre but less than 5 acres
IS GREATER than 5 acres
DOES discharge to a water body listed as impaired under Section 303(d) of the Clean Water
Act. See Appendix C - Impaired Body Conditions
6.2.1 Turbidity Sampling
Monitoring methods employed will be either:
Turbidity Meter (required for site equal to or greater than 5 acres)
Transparency Tube
Monitoring requirements for the proposed project will include either turbidity or water
transparency sampling to monitor site discharges for water quality compliance with the 2016
Construction Stormwater General Permit (Appendix D). Sampling will be conducted at all
discharge points at least once per calendar week.
Turbidity or transparency monitoring will follow the analytical methodologies described in
Section S4 of the 2016 Construction Stormwater General Permit (Appendix D). The key
benchmark values that require action are 25 NTU for turbidity (equivalent to 32 cm
transparency) and 250 NTU for turbidity (equivalent to 6 cm transparency). If the 25 NTU
benchmark for turbidity (equivalent to 32 cm transparency) is exceeded, the following steps will
be conducted:
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Ensure all BMPs specified in this SWPPP are installed and functioning as
intended.
Assess whether additional BMPs should be implemented, and document
revisions to the SWPPP as necessary.
Sample discharge location daily until the analysis results are less than 25
NTU (turbidity) or greater than 32 cm (transparency).
If the turbidity is greater than 25 NTU (or transparency is less than 32 cm) but less than 250
NTU (transparency greater than 6 cm) for more than 3 days, additional treatment BMPs will be
implemented within 24 hours of the third consecutive sample that exceeded the benchmark
value. Additional treatment BMPs to be considered will include, but are not limited to, off-site
treatment, infiltration, filtration and chemical treatment.
If the 250 NTU benchmark for turbidity (or less than 6 cm transparency) is exceeded at any time,
the following steps will be conducted:
Notify Ecology by phone within 24 hours of analysis (see Section 5.0 of
this SWPPP for contact information).
1. Continue daily sampling until the turbidity is less than 25 NTU (or
transparency is greater than 32 cm).
2. Initiate additional treatment BMPs such as off-site treatment, infiltration,
filtration and chemical treatment within 24 hours of the first occurrence of
NTUs exceeding 250
3. Implement additional treatment BMPs as soon as possible, but within 7
days of the first occurrence of NTUs exceeding 250.
4. 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.
6.2.2 pH Sampling
Stormwater runoff will be monitored for pH starting on the first day of any activity that
includes more than 40 yards of poured or recycled concrete, or after the application of
“Engineered Soils” such as, Portland cement treated base, cement kiln dust, or fly ash.
This does not include fertilizers. For concrete work, pH monitoring will start the first day
concrete is poured and continue until 3 weeks after the last pour. For engineered soils,
the pH monitoring period begins when engineered soils are first exposed to precipitation
and continue until the area is fully stabilized.
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Concrete work WILL NOT exceed 40 cubic yards at any given (this section will not
apply)
Concrete work WILL exceed 40 cubic yards at any given time
Engineered soil WILL BE used at this site
Engineered soil WILL NOT BE used at this site (this section will not apply)
Stormwater samples will be collected daily from all points of discharge from the site and
measured for pH using a calibrated pH meter, pH test kit, or wide range pH indicator
paper. If the measured pH is 8.5 greater, the following steps will be conducted:
1. Prevent the high pH water from entering storm drains or surface water.
2. Adjust or neutralize the high pH water if necessary using appropriate
technology such as CO2 sparging (liquid or dry ice)
3. Contact Ecology if chemical treatment other than CO2 sparging is planned
6.2.3 Temperature
This site WILL discharge to a water body listed on the Clean Water Act Section
303(d) list as impaired for temperature.
This site WILL NOT discharge to a water body listed on the Clean Water Act Section
303(d) list as impaired for temperature.
Temperature monitoring will be conducted using a calibrated temperature meter.
Sampling will be conducted at two locations, one upstream from the site discharge
location and one downstream from the sites discharge location. If the temperature is
higher upstream the following steps will be conducted:
1. Ensure all BMPs specified in this SWPPP are installed and functioning as
intended.
2. Assess whether additional BMPs such as relocation or shading of the
sedimentation tank should be implemented and revision to the SWPP are
necessary
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3. Record and report temperatures in the DMR as described in Section 7.0 of this
SWPPP
If the downstream temperature readings are greater than 1 degree Fahrenheit higher than
the temperatures upstream of the discharge point, the following steps will be conducted:
1. Notify Ecology by phone within 24 hours of analysis
2. Immediately initiate additional treatment BMPs such as providing shade to the
temporary sedimentation trap, or relocating the uncovered sedimentation tank
to a shaded area.
3. Continue daily sampling until the temperature difference between sample
locations until is less than 1 degree
4. Describe inspection results and remedial actions taken in the site log book and
in the monthly discharge monitoring report as described in Section 7.0 of this
SWPPP
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; and,
Stormwater quality monitoring.
For convenience, the inspection form and water quality monitoring forms included in this
SWPPP include the required information for the site log book.
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7.1.2 Records Retention
Records of all monitoring information (site log book, inspection reports/checklists, etc.),
this Stormwater Pollution Prevention Plan, and any other documentation of compliance
with permit requirements will be retained during the life of the construction project and
for a minimum of three years following the termination of permit coverage in accordance
with permit condition S5.C.
7.1.3 Access to Plans and Records
The SWPPP, General Permit, Notice of Authorization letter, and Site Log Book will be
retained on site or within reasonable access to the site and will be made immediately
available upon request to Ecology or the local jurisdiction. A copy of this SWPPP will
be provided to Ecology within 14 days of receipt of a written request for the SWPPP
from Ecology. Any other information requested by Ecology will be submitted within a
reasonable time. A copy of the SWPPP or access to the SWPPP will be provided to the
public when requested in writing in accordance with permit condition S5.G.
7.1.4 Updating the SWPPP
In accordance with Conditions S3, S4.B, and S9.B.3 of the General Permit, this SWPPP
will be modified if the SWPPP is ineffective in eliminating or significantly minimizing
pollutants in stormwater discharges from the site or there has been a change in design,
construction, operation, or maintenance at the site that has a significant effect on the
discharge, or potential for discharge, of pollutants to the waters of the State. The SWPPP
will be modified within seven days of determination based on inspection(s) that
additional or modified BMPs are necessary to correct problems identified, and an updated
timeline for BMP implementation will be prepared.
7.2 Reporting
7.2.1 Discharge Monitoring Reports
Discharge Monitoring Reports (DMRs) will be submitted to Ecology monthly
electronically via Ecology’s online Web Portal and will include water quality sampling
results for turbidity and pH. If there was no discharge during a given monitoring period,
the Permittee shall submit the form as required, with the words “No discharge” entered in
the place of monitoring results. The DMR due date is 15 days following the end of each
month.
7.2.2 Notification of Noncompliance
If any of the terms and conditions of the permit is not met, and it causes a threat to human
health or the environment, the following steps will be taken in accordance with permit
section S5.F:
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1. Ecology will be immediately notified of the failure to comply.
2. Immediate action will be taken to control the noncompliance issue
and to correct the problem. If applicable, sampling and analysis of
any noncompliance will be repeated immediately and the results
submitted to Ecology within five (5) days of becoming aware of
the violation.
3. A detailed written report describing the noncompliance will be
submitted to Ecology within five (5) days, unless requested earlier
by Ecology.
Any time turbidity sampling indicates turbidity is 250 NTU or greater or water
transparency is 6 centimeters or less, the Ecology regional office will be notified
by phone within 24 hours of analysis as required by permit conditions S5.A
In accordance with permit conditions S4.F.6.b, the Ecology regional office will be
notified if chemical treatment other than CO2 sparging is planned for adjustment
of high pH water.
7.2.3 Permit Application and Changes
In accordance with permit condition S2.A, a complete application form will be submitted
to Ecology and the appropriate local jurisdiction (if applicable) to be covered by the
General Permit.
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Appendix A – Site Plans
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Appendix B - Spill Prevention, Control, and Countermeasure
(SPCC) Plan
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Appendix C – Environmental Constraints and Impaired Body
Conditions
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Appendix D – General Permit
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Appendix E – Site Inspection Forms (and Site Log)
The results of each inspection shall be summarized in an inspection report or checklist that
is entered into or attached to the site log book. It is suggested that the inspection report or
checklist be included in this appendix to keep monitoring and inspection information in
one document, but this is optional. However, it is mandatory that this SWPPP and the site
inspection forms be kept onsite at all times during construction, and that inspections be
performed and documented as outlined below.
At a minimum, each inspection report or checklist shall include:
a. Inspection date/times
b. Weather information: general conditions during inspection,
approximate amount of precipitation since the last inspection, and
approximate amount of precipitation within the last 24 hours.
c. A summary or list of all BMPs that have been implemented,
including observations of all erosion/sediment control structures or
practices.
d. The following shall be noted:
i. locations of BMPs inspected,
ii. locations of BMPs that need maintenance,
iii. the reason maintenance is needed,
iv. locations of BMPs that failed to operate as designed or
intended, and
v. locations where additional or different BMPs are needed
and the reason(s) why.
e. A description of stormwater discharged from the site. The presence
of suspended sediment, turbid water, discoloration, and/or oil
sheen shall be noted, as applicable.
f. A description of any water quality monitoring performed during
inspection, and the results of that monitoring.
g. General comments and notes, including a brief description of any
BMP repairs, maintenance or installations made as a result of the
inspection.
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 NPDES
permit. If the site inspection indicates that the site is out of
compliance, the inspection report shall include a summary of the
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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 NPDES permit, the Permittee shall take immediate action(s) to: stop,
contain, and clean up the unauthorized discharges, or otherwise stop the noncompliance;
correct the problem(s); implement appropriate Best Management Practices (BMPs),
and/or conduct maintenance of existing BMPs; and achieve compliance with all
applicable standards and permit conditions. In addition, if the noncompliance causes a
threat to human health or the environment, the Permittee shall comply with the
Noncompliance Notification requirements in Special Condition S5.F of the permit.
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Appendix F – Reports and Engineering Calculations
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Appendix G – Best Management Practices (BMPs)