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HomeMy WebLinkAbout03737 - Technical Information Report - Stormwater Pollution Prevention Plan Stormwater Pollution Prevention Plan For Fred Meyer Fueling Facility Store#459—Renton, Washington Prepared For Northwest Regional Office 3190- 160th Avenue SE Bellevue,WA 98008-5452 425-649-7000 Owner Developer Operator/Contractor Fred Meyer Stores, Inc. Fred Meyer Stores, Inc. 3800 SE 22m Avenue 3800 SE 22nd Avenue — Portland, Oregon 97202 Portland, Oregon 97202 Project Site Location 431 Rainier Avenue S. Renton, Washington Certified Erosion and Sediment Control Lead SWPPP Prepared By Barghausen Consulting Engineers, Inc. 18215—72nd Avenue South Kent, Wa. 98032 (425) 251-6222 Dan Lamotte,Project Engineer Karen Harris, Project Engineer SWPPP Preparation Date May 17, 2013 Updated June 12, 2013 Updated March 24, 2014 CITY OF RENTON Approximate Project Construction Dates RECEIVED May, 2014- July, 2014 • MAY 0 5 2014 BUILDING DIVISION 13245.008.docx 3?31 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 12 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 6 3.1.5 Element#5 — Stabilize Soils 7 3.1.6 Element#6—Protect Slopes 7 3.1.7 Element#7 —Protect Drain Inlets 8 3.1.8 Element#8 — Stabilize Channels and Outlets 8 3.1.9 Element#9—Control Pollutants 8 3.1.10 Element#10—Control Dewatering 9 3.1.11 Element #11 — Maintain BMPs 15 3.1.12 Element#12 —Manage the Project 15 3.2 Site Specific BMPs 15 3.3 Additional Advanced BMPs 15 4.0 Construction Phasing and BMP Implementation 15 5.0 Pollution Prevention Team 17 5.1 Roles and Responsibilities 17 5.2 Team Members 18 6.0 Site Inspections and Monitoring 19 6.1 Site Inspection 19 6.1.1 Site Inspection Frequency 19 6.1.2 Site Inspection Documentation 19 6.2 Stormwater Quality Monitoring 20 7.0 Reporting and Recordkeeping 21 7.1 Recordkeeping 21 7.1.1 Site Log Book 21 7.1.2 Records Retention 21 7.1.3 Access to Plans and Records 21 7.1.4 Updating the SWPPP 21 7.2 Reporting 22 7.2.1 Discharge Monitoring Reports 22 ii 13245.008.docx 7.2.2 Notification of Noncompliance 22 7.2.3 Permit Application and Changes 22 Appendix A— Site Plans 23 Appendix B —Construction BMPs 24 Appendix C—Alternative BMPs 25 Appendix D—General Permit 26 Appendix E—Kroger Site Log and Inspection Forms 28 Appendix F—Engineering Calculations 37 Appendix A Site plans • Vicinity map (with all discharge points) • Site plan with TESC measures Appendix B Construction BMPs • Possibly reference in BMPs, but likely it will be a consolidated list so that the applicant can photocopy from the list from the SWMM. Appendix C Alternative Construction BMP list • List of BMPs not selected, but can be referenced if needed in each of the 12 elements Appendix D General Permit Appendix E Kroger Site Log and Inspection Forms Appendix F Engineering Calculations iii 13245.008.docx Stormwater Pollution Prevention Plan 1.0 Introduction This Stormwater Pollution Prevention Plan(SWPPP)has been prepared as required by the State of Washington for the Fred Meyer Fuel Station construction project in Renton, Washington. The site is located on the south side of Renton Center Way and west side of Rainier Avenue South. The existing site is approximately 1.1 acres with a single story commercial building. The proposed development consists of a new fueling facility with kiosk, including underground fuel storage tanks, stormwater quality facility,paved parking,pedestrian plaza, and site landscaping. Construction activities will include demolition, excavation, grading, relocation of onsite services/utilities, a poured concrete slabs, and construction of a fuel dispensing canopy. 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 using the Ecology SWPPP Template downloaded from the Ecology website in May 2013. This SWPPP was prepared based on the requirements set forth in the Construction Stormwater General Permit, Stormwater Management Manual for Western Washington(SWMMWW 2005) and in the Stormwater Management Manual for Eastern Washington(SWMMEW 2004). The 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. 1 13245.008.docx Storm water Pollution Prevention Plan 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—Construction BMPs Appendix C—Alternative Construction BMP list Appendix D—General Permit Appendix E—Site Log and Inspection Forms Appendix F—Engineering Calculations 2 13245.008.docx Stormwater Pollution Prevention Plan 2.0 Site Description 2.1 Existing Conditions The proposed Fred Meyer Fueling Facility project is located at 431 Rainier Avenue South, in the City of Renton, King County, Washington. The site is located west of Rainier Avenue South and south of Renton Center Way. The existing Fred Meyer retail store building is located on the adjacent property to the west. The existing site contains an existing retail building with an associated asphalt parking lot and drive aisles, which will all be demolished for construction of the proposed fueling facility. The proposed project site generally slopes from east to west and from south to north. Access to the site will be from Rainier Avenue South and the adjacent Fred Meyer parking lot. Stormwater runoff from the existing site is collected in catch basins and conveyed to the existing storm drainage system located in the existing Fred Meyer parking lot. There are no known critical areas on the site, such as high erosion risk areas, wetlands, streams, or steep slopes (potential landslide area). This site does drain to a 303(d)-listed impaired water body. The site eventually drains to the Black River, which is listed for Fecal Coliform Bacteria. 2.2 Proposed Construction Activities The proposed project includes construction of a Fred Meyer retail fueling facility consisting of 9 fuel dispensing islands, a free-standing dispenser island canopy, a cashiers kiosk with restroom, and installation of two underground gasoline storage tanks measuring 20,000 gallons and 18,000 gallons in size. Both underground tanks are double-walled fiberglass. Other associated site improvements include site paving, landscaping, and utility infrastructure to serve the fuel center and surrounding parking lot. The project will also include an air/water unit in the vicinity of the fuel center. A portion of the existing asphalt parking lot on the Fred Meyer store parcel will be disturbed for the installation of Stormwater and communication utilities. Construction activities will include site preparation, TESC installation, demolition of the existing building, excavation for the canopy foundations, fuel tank installation, and storm infiltration facilities, poured concrete slabs, site-wide grading, and asphalt paving. The schedule and phasing of BMPs during construction is provided in Section 4.0. 3 13245.008.docx Stormwater Pollution Prevention Plan Stormwater runoff volumes were calculated using the City of Renton adopted KCRTS from the 2009 King County Surface Water Design Manual. The Filterra stormwater treatment units have been designed in accordance with the manufacturers guidelines and as accepted through Washington State Dept. of Ecology GULD. After the facility is constructed and all new utilities are installed, the site will be graded and paved. A landscape and pedestrian plaza area will be constructed at the northeast side of the property and the perimeter area will contain individually new landscaping. The following summarizes details regarding site areas: Total site area: 1.13 acres Percent impervious area before construction: 76 % Percent impervious area after construction: 88 % Disturbed area during construction: 1.13 acres Disturbed area that is characterized as impervious (i.e., access roads, staging,parking): 0.9 acres Stormwater flow calculations are provided in Appendix F. 4 13245.008.docx Storm water Pollution Prevention Plan 3.0 Construction Stormwater BMPs 3.1 The 12 BMP Elements 3.1.1 Element#1 —Mark Clearing Limits To protect adjacent properties and to reduce the area of soil exposed to construction, the limits of construction will be clearly marked before land-disturbing activities begin. Trees that are to be preserved, as well as all sensitive areas and their buffers, shall be clearly delineated,both in the field and on the plans. In general, natural vegetation and native topsoil shall be retained in an undisturbed state to the maximum extent possible. The BMPs relevant to marking the clearing limits that will be applied for this project include: • High visibility plastic or metal fence (BMP C103) Alternate construction access BMPs are included in Appendix C as a quick reference tool for the onsite inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate during construction to satisfy the requirements set forth in the General NPDES Permit (Appendix D). To avoid potential erosion and sediment control issues that may cause a violation(s) of the NPDES Construction Stormwater permit(as provided in Appendix D), the Certified Erosion and Sediment Control Lead will promptly initiate the implementation of one or more of the alternative BMPs listed in Appendix C after the first sign that existing BMPs are ineffective or failing. 3.1.2 Element#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, street sweeping and street cleaning shall be employed to prevent sediment from entering state waters. All wash wastewater shall be controlled on site. The specific BMPs related to establishing construction access that will be used on this project include: • Stabilized Construction Entrance (BMP C 105) The roads shall be swept daily should sediment collect on them. Alternate construction access BMPs are included in Appendix C as a quick reference tool for the onsite inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate during construction to satisfy the requirements set forth in the General NPDES Permit (Appendix D). To avoid potential erosion and sediment control issues that may cause a violation(s)of the NPDES Construction Stormwater permit(as provided in Appendix D),the Certified Erosion and 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. 5 13245.008.docx Storm water Pollution Prevention Plan 3.1.3 Element#3—Control Flow Rates In order to protect the properties and waterways downstream of the project site, stormwater discharges from the site will be controlled. The specific BMPs for flow control that shall be used on this project include: No BMPs to be implemented Impervious areas and discharge rates from the site will decrease as result of construction, reducing the chance of downstream erosion. Alternate flow control BMPs are included in Appendix C as a quick reference tool for the onsite inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate during construction. To avoid potential erosion and sediment control issues,the Certified Erosion and Sediment Control Lead will promptly initiate the implementation of one or more of the alternative BMPs listed in Appendix C after the first sign that existing BMPs are ineffective or failing. In general, discharge rates of stormwater from the site will be controlled where increases in impervious area or soil compaction during construction could lead to downstream erosion, or where necessary to meet local agency stormwater discharge requirements (e.g. discharge to combined sewer systems). 3.1.4 Element#4—Install Sediment Controls All stormwater runoff from disturbed areas shall pass through an appropriate sediment removal BMP before leaving the construction site or prior to being discharged to an infiltration facility. The specific BMPs to be used for controlling sediment on this project include: • Silt Fence (BMP C233) • Storm Drain Inlet Protection (BMP C220) Alternate sediment control BMPs are included in Appendix C as a quick reference tool for the onsite inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate during construction. To avoid potential erosion and sediment control issues, the Certified Erosion and Sediment Control Lead will promptly initiate the implementation of one or more of the alternative BMPs listed in Appendix C after the first sign that existing BMPs are ineffective or failing. In addition, sediment will be removed from paved areas in and adjacent to construction work areas manually or using mechanical sweepers, as needed, to minimize tracking of sediments on vehicle tires away from the site and to minimize wash-off of sediments from adjacent streets in runoff. 6 13245.008.docx Stormwater Pollution Prevention Plan 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. 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: • Dust Control (BMP C 120) Alternate soil stabilization BMPs are included in Appendix C as a quick reference tool for the onsite inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate during construction. To avoid potential erosion and sediment control issues,the Certified Erosion and Sediment Control Lead will promptly initiate the implementation of one or more of the alternative BMPs listed in Appendix C after the first sign that existing BMPs are ineffective or failing. In general, cut and fill slopes will be stabilized as soon as possible and soil stockpiles will be temporarily covered with plastic sheeting. All stockpiled soils shall be stabilized from erosion, protected with sediment trapping measures, and where possible, be located away from storm drain inlets,waterways, and drainage channels. 3.1.6 Element#6—Protect Slopes All cut and fill slopes will be designed, constructed, and protected in a manner than minimizes erosion. The following specific BMPs will be used to protect slopes for this project: No BMPs to be implemented Alternate slope protection BMPs are included in Appendix C as a quick reference tool for the onsite inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate during construction. To avoid potential erosion and sediment control issues, the Certified Erosion and Sediment Control Lead will promptly initiate the implementation of one or more of 7 13245.008.docx Storm water Pollution Prevention Plan the alternative BMPs listed in Appendix C 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: • Storm Drain Inlet Protection(BMP C220) If the BMP options listed above are deemed ineffective or inappropriate during construction or if no BMPs are listed above but deemed necessary during construction, the Certified Erosion and Sediment Control Lead shall implement one or more of the alternative BMP inlet protection options listed in Appendix C. 3.1.8 Element#8—Stabilize Channels and Outlets Where site runoff is to be conveyed in channels, or discharged to a stream or some other natural drainage point, efforts will be taken to prevent downstream erosion. The specific BMPs for channel and outlet stabilization that shall be used on this project include: No BMPs to be implemented Alternate channel and outlet stabilization BMPs are included in Appendix C as a quick reference tool for the onsite inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate during construction . To avoid potential erosion and sediment control issues, the Certified Erosion and Sediment Control Lead will promptly initiate the implementation of one or more of the alternative BMPs listed in Appendix C after the first sign that existing BMPs are ineffective or failing. 3.1.9 Element#9—Control Pollutants All pollutants, including waste materials and demolition debris,that occur onsite shall be handled and disposed of in a manner that does not cause contamination of stormwater. Good housekeeping and preventative measures will be taken to ensure that the site will be kept clean, well organized, and free of debris. If required, BMPs to be implemented to control specific sources of pollutants are discussed below. This site drains to the Black River which is 303(d)-listed for Fecal Coliform bacteria. It is critical that all animal waste if encountered be disposed of properly and not exposed to rainfall. 8 13245.008.docx Stormwater Pollution Prevention Plan 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, containment, and protection provided on site, per BMP C153 for Material Delivery, Storage and Containment in SWMMWW 2005 Application of agricultural chemicals, including fertilizers and pesticides, shall be conducted in a manner and at application rates that will not result in loss of chemical to stormwater runoff. Manufacturers' recommendations for application procedures and rates shall be followed. 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). 3.1.10 Element#10—Control Dewatering All dewatering water from open cut excavation,tunneling, foundation work, trench, or underground vaults shall be discharged into a controlled conveyance system prior to discharge to a sediment trap or sediment pond. Channels will be stabilized,per Element#8. Clean, non- turbid dewatering water will not be routed through stormwater sediment ponds, and will be discharged 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. 9 13245.008.docx Stormwater Pollution Prevention Plan Highly turbid dewatering water from soils known or suspected to be contaminated, or from use of construction equipment, will require additional monitoring and 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) ❑ Infiltration ❑ Use of a sedimentation bag,with outfall to a ditch or swale for small volumes of localized dewatering. 3.1.11 Element#11 —Maintain BMPs All temporary and permanent erosion and sediment control BMPs shall be maintained and repaired as needed to assure continued performance of their intended function. Maintenance and repair shall be conducted in accordance with each particular BMPs specifications(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. 3.1.12 Element#12—Manage the Project Erosion and sediment control BMPs for this project have been designed based on the following principles: Design the project to fit the existing topography, soils, and drainage patterns. Emphasize erosion control rather than sediment control. Minimize the extent and duration of the area exposed. Keep runoff velocities low. 10 13245.008.docx Storm water Pollution Prevention Plan 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: (West Response)As this project site is located west of the Cascade Mountain Crest, the project will be managed according to the following key project components: Phasing of Construction The construction project is being phased to the extent practicable in order to prevent soil erosion, and, to the maximum extent possible, the transport of sediment from the site during construction. 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: ❑ Routine maintenance and necessary repair of erosion and sediment control BMPs; 11 13245.008.docx Storm water Pollution Prevention Plan ❑ 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 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. 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 12 13245.008.docx Storm water Pollution Prevention Plan include additional or modified BMPs designed to correct problems identified. Revisions to the SWPPP shall be completed within seven(7)days following the inspection. 3.2 Site Specific BMPs Site specific BMPs are shown on the TESC Plan Sheets and Details in Appendix A. These site specific plan sheets will be updated annually. 3.3 Additional Advanced BMPs 13 13245.008.docx Storm water Pollution Prevention Plan 4.0 Construction Phasing and BMP Implementation • Mobilization to Site May 2014 • Installation of Utilities May 2014 • Building Construction June 2014 • Final Paving July 2014 • Final Landscaping July 2014 15 13245.008.docx Stormwater Pollution Prevention Plan 5.0 Pollution Prevention Team 5.1 Roles and Responsibilities The pollution prevention team consists of personnel responsible for implementation of the SWPPP, including the following: Certified Erosion and Sediment Control Lead(CESCL)—primary contractor contact, responsible for site inspections (BMPs, visual monitoring, sampling, etc.); to be called upon in case of failure of any ESC measures. Resident Engineer—For projects with engineered structures only(sediment ponds/traps, sand filters, etc.): site representative for the owner that is the project's supervising engineer responsible for inspections and issuing instructions and drawings to the contractor's site supervisor or representative Emergency Ecology Contact—individual to be contacted at Ecology in case of emergency. Emergency Owner Contact—individual that is the site owner or representative of the site owner to be contacted in the case of an emergency. Non-Emergency Ecology Contact—individual that is the site owner or representative of the site owner than can be contacted if required. Monitoring Personnel—personnel responsible for conducting water quality monitoring; for most sites this person is also the Certified Erosion and Sediment Control Lead. 17 13245.008.docx Storm water Pollution Prevention Plan 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) TBD Resident Engineer Jason Hubbell,P.E. (425)251-6222 Emergency Ecology Contact Staff on Duty (360)407-6242 Emergency Owner Contact Chris Taylor,Kroger PM (503)797-3708 Non-Emergency Ecology Contact Clay Keown (360)407-6048 Monitoring Personnel TBD 18 13245.008.docx Storm water Pollution Prevention Plan 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. 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 19 13245.008.docx Storm water Pollution Prevention Plan 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 Downstream of the site, the drainage is conveyed and eventually drains to the Black River. This river is a 303(d)-listed impaired water body, which is listed for Fecal Coliform Bacteria. A Construction Stormwater General Permit for Discharge to an Impaired Water Body has been applied for and granted for this project. Stormwater will not be exposed to the pollutant(s) for which the water body is impaired, and SWPPP details procedures taken to prevent exposure on site. 20 13245.008.docx Stormwater Pollution Prevention Plan 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. 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,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 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 21 13245.008.docx Stormwater Pollution Prevention Plan 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 [Prior to October 2008] If cumulative soil disturbance is smaller than 5 acres: Discharge Monitoring Report(DMR) forms will not be submitted to Ecology because water quality sampling is not being conducted at the site. If cumulative soil disturbance is 5 acres or larger: Discharge Monitoring Reports (DMRs)will be submitted to Ecology monthly. Of 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 are not met, and it causes a threat to human health or the environment,the following steps will be taken: 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. 22 13245.008.docx Storm water Pollution Prevention Plan Appendix A — Site Plans 23 13245.008.docx DEM�LITlON AND T.E.S.C. 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E WSfF4 PEfGIIEfJt FN07EC�Y1 $2T ME1 PflOTEC1�ON P't4 FAa 132 5 5-02-EDYG � ( FUICF.BRInN BN�iER.RC). <. COHiNACfUQt SHHL PAOTEQ A*ID PPESEHYE HL�VEAEIIIS ALONC T1£PEPo4EIER OF 7HE M'paf � 4eda1: MFA ANY�D INPFONEIEHfS SFMLL BE NEPNRED/RERACEO AT CpNiRACTfd'i'S E7tPEN5E. 7.CClVSfAUCT 54/7FKE NAIER CONfR�LS 54i1gTN1E0lf5LY NfH CIFM�IC MI�GRAOWC FOR FNOJECT DEVEICPNEM. 1tl11f5 OF CLElAING • � &WMTAM ER09QM CONTROL 4�EA416K5 k A�4CE W�Tfi GIY OF flENfON STANU�Rp$AN6 WViKlLTlRiRS '3. NL 54i PROTERiON AND EflOSroX CONTROL YEARI�S YUST BE W RALE�FOR:S�NCMTiN6,CUPB � ; -- .i �� b5 AAfaER AYE�a1E SdRH r RECOMYENM11pV5. ANl PM�IENf RE40VAL.d2 RE40NAL Of PLINiERi PAYE11QtT NF1qYAl LM175 . :�: .-.�� ::� 1�NfON�M+1900i7 � 9.NfLOCATf SUfiFACE fiNiER C7WIf40.'.5 A4]FA06pN COMROL ILASURES OR PISIALL NEV IfEASURES SO TXAT 15�Tf 4 PROi�E SREE�IOtEC110N FENCHG ql NL 7NkF5 i0 HEYAfL PRIOR 1D� COOfiOItMiE �`-_LL:----�--._��_�� L COt101110N5 C4UNCE THE ERD9CN AHO SEiyYEIIT LONfROL 6 ALVAYS W M.CORQhNCE N7tS CRY OF fi�ON EX6fNG TiiEE LOG710N5 Wi}#WDSCN'E P1A11?MIG PU1N. CONSiRI1CTpN FENCE �e k �-- *- DBi�IOL.R�ON AI�D ' SE ,E EftO5i0N M�SFD�M LONTftOI SW�UAfDS. 7. DlAi1NG 1HE CEOTECHNJ�RNEW.ADIXIqNH_i11mEHt]iIXlO PAVENiN!WAS dSCOKRED.ANt � TE$.C.�,./W c MMYENT ENCOlINTEiED DURNG FOOTING OR FOUTAATqN ODNSfRLL110N SF41lL BE REYOVED. S�CT FENCE � • i ► � !0.W4ER ILL ARFAS 1HAT M£L BE UIMORKfD FOR 40AE TkATI SEYEN MYS DURNG iHE CAY SEASON INi 1Y10 DAYS F�A�YF� DI.RINC Tt1E�'f SEASOH Cil4 SIP�W.N000 F�A NlLC�4 CONPO5�.R/SM 9fEEfNG OR EO:AJNE:VT. SUflFN�FICV A[diOH ti. RI�NCi FACI,lTY 11.SUHiLQf All ARE15 hG4T R&YCN f2UV.GFAOE 11T1M SMM Q�YS. PPE REMOV�L _...___��___��_ pO"^9 S 11.SEED OR Sm ANY ARFAS 70 NOWN U4NOR�0 fYp1 YONE MW!0 ONK. L1.R8 RE40dL .�..............._'_""'......._ �/'� n ..."'............. . .............. 11 UPON CCUPLE7qY O(T1�PRG&CT,1�L.qS�URBED MAS NJST BE 5"��_(IED ND EEST WNhCE4ENT P0.hCTICES 50.1M'UT 111g ___'_'_""_"'_'____"___ � of 9 a R£�CJVED F IFFf4.'P.'Z�ATE. � c Stormwater Pollution Prevention Plan Appendix B — Construction BMPs High Visibility Plastic or Metal Fence(BMP C103) Stabilized Construction Entrance(BMP C105) Temporary and Permanent Seeding(BMP C120) Mulching(BMP C121) Topsoiling(BMP C 125) Dust Control(BMP C 140) Materials on Hand(BMP C150) Concrete Handling(BMP C151) Storm Drain Inlet Protection(BMP C220) Silt Fence(BMP C233) 24 13245.008.docx BMP C103: High Visibility Plastic or Metal Fence Purpose Fencing is intended to: (1)restrict clearing to approved limits; (2)prevent disturbance of sensitive areas,their buffers, and other areas required to be left undisturbed; (3) limit construction traffic to designated construction entrances or roads; and, (4)protect areas where marking with survey tape may not provide adequate protection. Conditions of Use To establish clearing limits,plastic or metal fence may be used: • At the boundary of sensitive areas, their buffers, and other areas required to be left uncleared. • As necessary to control vehicle access to and on the site. Design and • High visibility plastic fence shall be composed of a high-density Installation polyethylene material and shall be at least four feet in height. Posts Specifications for the fencing shall be steel or wood and placed every 6 feet on center(maximum)or as needed to ensure rigidity. The fencing shall be fastened to the post every six inches with a polyethylene tie. On long continuous lengths of fencing, a tension wire or rope shall be used as a top stringer to prevent sagging between posts. The fence color shall be high visibility orange. The fence tensile strength shall be 360 lbs./ft. using the ASTM D4595 testing method. • Metal fences shall be designed and installed according to the manufacturer's specifications. • Metal fences shall be at least 3 feet high and must be highly visible. • Fences shall not be wired or stapled to trees. Maintenance • If the fence has been damaged or visibility reduced, it shall be Standards repaired or replaced immediately and visibility restored. 4-6 Volume ll— Construction Stormwater Pollution Prevention February 2005 BMP C105: Stabilized Construction Entrance Putpose Construction entrances are stabilized to reduce the amount of sediment transported onto paved roads by vehicles or equipment by constructing a stabilized pad of quarry spalls at entrances to construction sites. Conditions of Use Construction entrances shall be stabilized wherever traffic will be leaving a construction site and traveling on paved roads or other paved areas within 1,000 feet of the site. On large commercial, highway, and road projects, the designer should include enough extra materials in the contract to allow for additional stabilized entrances not shown in the initial Construction SWPPP. It is difficult to determine exactly where access to these projects will take place; additional materials will enable the contractor to install them where needed. Design and • See Figure 4.2 for details. Note: the 100' minimum length of the Installation entrance shall be reduced to the maximum practicable size when the Specifications size or configuration of the site does not allow the full length(100'). • A separation geotextile shall be placed under the spalls to prevent fine sediment from pumping up into the rock pad. The geotextile shall meet the following standards: Grab Tensile Strength (ASTM D4751) 200 psi min. Grab Tensile Elongation (ASTM D4632) 30% max. Mullen Burst Strength (ASTM D3786-80a) 400 psi min. AOS(ASTM D4751) 20-45(U.S. standard sieve size) • Consider early installation of the first lift of asphalt in areas that will paved; this can be used as a stabilized entrance. Also consider the installation of excess concrete as a stabilized entrance. During large concrete pours, excess concrete is often available for this purpose. • Hog fuel (wood-based mulch)may be substituted for or combined with quarry spalls in areas that will not be used for permanent roads. Hog fuel is generally less effective at stabilizing construction entrances and should be used only at sites where the amount of traffic is very limited. Hog fuel is not recommended for entrance stabilization in urban areas. The effectiveness of hog fuel is highly variable and it generally requires more maintenance than quarry spalls. The inspector may at any time require the use of quarry spalls if the hog fuel is not preventing sediment from being tracked onto pavement or if the hog fuel is being carried onto pavement. Hog fuel is prohibited in permanent roadbeds because organics in the subgrade soils cause degradation of the subgrade support over time. • Fencing(see BMPs C103 and C104) shall be installed as necessary to restrict traffic to the construction entrance. 4-8 Volume ll— Construction Stormwater Pollution Prevention February 2005 • Whenever possible,the entrance shall be constructed on a firm, compacted subgrade. This can substantially increase the effectiveness of the pad and reduce the need for maintenance. Maintenance • Quarry spalls (or hog fuel) shall be added if the pad is no longer in Standards accordance with the specifications. • If the entrance is not preventing sediment from being tracked onto pavement,then alternative measures to keep the streets free of sediment shall be used. This may include street sweeping, an increase in the dimensions of the entrance, or the installation of a wheel wash. • Any sediment that is tracked onto pavement shall be removed by shoveling or street sweeping. The sediment collected by sweeping shall be removed or stabilized on site. The pavement shall not be cleaned by washing down the street, except when sweeping is ineffective and there is a threat to public safety. If it is necessary to wash the streets, the construction of a small sump shall be considered. The sediment would then be washed into the sump where it can be controlled. • Any quarry spalls that are loosened from the pad, which end up on the roadway shall be removed immediately. • If vehicles are entering or exiting the site at points other than the construction entrance(s), fencing(see BMPs C l 03 and Cl 04) shall be installed to control traffic. • Upon project completion and site stabilization, all construction accesses intended as permanent access for maintenance shall be permanently stabilized. Driveway shall meet the requirements of the permitting agency ft is recommended that the entrance be crowned so that runoff Poad drains off the pad 4;0 Cdir '4150 VOliktk Install driveway culvert x,444,044 if there is a roadside `Yr:•!;1�� ditch present \".irigO, S. ,. 4"-8"quarry spalls A i x.`40P ;�•�:•x Geotextile4) .: 12"min.thickness Provide full width of ingress egress area Figure 4.2—Stabilized Construction Entrance February 2005 Volume II— Construction Stormwater Pollution Prevention 4-9 BMP C120: Temporary and Permanent Seeding Purpose Seeding is intended to reduce erosion by stabilizing exposed soils. A well-established vegetative cover is one of the most effective methods of reducing erosion. Conditions of Use • Seeding may be used throughout the project on disturbed areas that have reached final grade or that will remain unworked for more than 30 days. • Channels that will be vegetated should be installed before major earthwork and hydroseeded with a Bonded Fiber Matrix. The vegetation should be well established(i.e., 75 percent cover)before water is allowed to flow in the ditch. With channels that will have high flows, erosion control blankets should be installed over the hydroseed. If vegetation cannot be established from seed before water is allowed in the ditch, sod should be installed in the bottom of the ditch over hydromulch and blankets. • Retention/detention ponds should be seeded as required. • Mulch is required at all times because it protects seeds from heat, moisture loss, and transport due to runoff. • All disturbed areas shall be reviewed in late August to early September and all seeding should be completed by the end of September. Otherwise,vegetation will not establish itself enough to provide more than average protection. • At final site stabilization, all disturbed areas not otherwise vegetated or stabilized shall be seeded and mulched. Final stabilization means the completion of all soil disturbing activities at the site and the establishment of a permanent vegetative cover, or equivalent permanent stabilization measures (such as pavement, riprap, gabions or geotextiles)which will prevent erosion. Design and • Seeding should be done during those seasons most conducive to Installation growth and will vary with the climate conditions of the region. Specifications Local experience should be used to determine the appropriate seeding periods. • The optimum seeding windows for western Washington are April 1 through June 30 and September 1 through October 1. Seeding that occurs between July 1 and August 30 will require irrigation until 75 percent grass cover is established. Seeding that occurs between October 1 and March 30 will require a mulch or plastic cover until 75 percent grass cover is established. • To prevent seed from being washed away, confirm that all required surface water control measures have been installed. February 2005 Volume II— Construction Stormwater Pollution Prevention 4-13 • The seedbed should be firm and rough. All soil should be roughened no matter what the slope. If compaction is required for engineering purposes, slopes must be track walked before seeding. Backblading or smoothing of slopes greater than 4:1 is not allowed if they are to be seeded. • New and more effective restoration-based landscape practices rely on deeper incorporation than that provided by a simple single-pass rototilling treatment. Wherever practical the subgrade should be initially ripped to improve long-term permeability, infiltration, and water inflow qualities. At a minimum,permanent areas shall use soil amendments to achieve organic matter and permeability performance defined in engineered soil/landscape systems. For systems that are deeper than 8 inches the rototilling process should be done in multiple lifts, or the prepared soil system shall be prepared properly and then placed to achieve the specified depth. • Organic matter is the most appropriate form of"fertilizer"because it provides nutrients (including nitrogen,phosphorus, and potassium) in the least water-soluble form. A natural system typically releases 2-10 percent of its nutrients annually. Chemical fertilizers have since been formulated to simulate what organic matter does naturally. • In general, 10-4-6 N-P-K(nitrogen-phosphorus-potassium) fertilizer can be used at a rate of 90 pounds per acre. Slow-release fertilizers should always be used because they are more efficient and have fewer environmental impacts. It is recommended that areas being seeded for final landscaping conduct soil tests to determine the exact type and quantity of fertilizer needed. This will prevent the over-application of fertilizer. Fertilizer should not be added to the hydromulch machine and agitated more than 20 minutes before it is to be used. If agitated too much, the slow-release coating is destroyed. • There are numerous products available on the market that take the place of chemical fertilizers. These include several with seaweed extracts that are beneficial to soil microbes and organisms. If 100 percent cottonseed meal is used as the mulch in hydroseed, chemical, fertilizer may not be necessary. Cottonseed meal is a good source of long-term, slow-release, available nitrogen. • Hydroseed applications shall include a minimum of 1,500 pounds per acre of mulch with 3 percent tackifier. Mulch may be made up of 100 percent: cottonseed meal; fibers made of wood,recycled cellulose, hemp, and kenaf; compost; or blends of these. Tackifier shall be plant- based, such as guar or alpha plantago, or chemical-based such as polyacrylamide or polymers. Any mulch or tackifier product used shall be installed per manufacturer's instructions. Generally,mulches come in 40-50 pound bags. Seed and fertilizer are added at time of application. 4-14 Volume II— Construction Stormwater Pollution Prevention February 2005 • Mulch is always required for seeding. Mulch can be applied on top of the seed or simultaneously by hydroseeding. • On steep slopes, Bonded Fiber Matrix (BFM) or Mechanically Bonded Fiber Matrix (MBFM)products should be used. BFM/MBFM products are applied at a minimum rate of 3,000 pounds per acre of mulch with approximately 10 percent tackifier. Application is made so that a minimum of 95 percent soil coverage is achieved. Numerous products are available commercially and should be installed per manufacturer's instructions. Most products require 24-36 hours to cure before a rainfall and cannot be installed on wet or saturated soils. Generally, these products come in 40-50 pound bags and include all necessary ingredients except for seed and fertilizer. BFMs and MBFMs have some advantages over blankets: • No surface preparation required; • Can be installed via helicopter in remote areas; • On slopes steeper than 2.5:1,blanket installers may need to be roped and harnessed for safety; • They are at least$1,000 per acre cheaper installed. In most cases, the shear strength of blankets is not a factor when used on slopes, only when used in channels. BFMs and MBFMs are good alternatives to blankets in most situations where vegetation establishment is the goal. • When installing seed via hydroseeding operations, only about 1/3 of the seed actually ends up in contact with the soil surface. This reduces the ability to establish a good stand of grass quickly. One way to overcome this is to increase seed quantities by up to 50 percent. • Vegetation establishment can also be enhanced by dividing the hydromulch operation into two phases: 1. Phase 1- Install all seed and fertilizer with 25-30 percent mulch and tackifier onto soil in the first lift; 2. Phase 2-Install the rest of the mulch and tackifier over the first lift. An alternative is to install the mulch, seed, fertilizer, and tackifier in one lift. Then, spread or blow straw over the top of the hydromulch at a rate of about 800-1000 pounds per acre. Hold straw in place with a standard tackifier. Both of these approaches will increase cost moderately but will greatly improve and enhance vegetative establishment. The increased cost may be offset by the reduced need for: 1. Irrigation 2. Reapplication of mulch 3. Repair of failed slope surfaces February 2005 Volume ll— Construction Storm water Pollution Prevention 4-15 This technique works with standard hydromulch(1,500 pounds per acre minimum) and BFM/MBFMs(3,000 pounds per acre minimum). • Areas to be permanently landscaped shall provide a healthy topsoil that reduces the need for fertilizers, improves overall topsoil quality, provides for better vegetal health and vitality, improves hydrologic characteristics,and reduces the need for irrigation. This can be accomplished in a number of ways: Recent research has shown that the best method to improve till soils is to amend these soils with compost. The optimum mixture is approximately two parts soil to one part compost. This equates to 4 inches of compost mixed to a depth of 12 inches in till soils. Increasing the concentration of compost beyond this level can have negative effects on vegetal health,while decreasing the concentrations can reduce the benefits of amended soils. Please note: The compost should meet specifications for Grade A quality compost in Ecology Publication 94-038. Other soils, such as gravel or cobble outwash soils,may require different approaches. Organics and fines easily migrate through the loose structure of these soils. Therefore,the importation of at least 6 inches of quality topsoil,underlain by some type of filter fabric to prevent the migration of fines, may be more appropriate for these soils. Areas that already have good topsoil, such as undisturbed areas, do not require soil amendments. • Areas that will be seeded only and not landscaped may need compost or meal-based mulch included in the hydroseed in order to establish vegetation. Native topsoil should be re-installed on the disturbed soil surface before application. • Seed that is installed as a temporary measure may be installed by hand if it will be covered by straw,mulch, or topsoil. Seed that is installed as a permanent measure may be installed by hand on small areas (usually less than 1 acre)that will be covered with mulch, topsoil, or erosion blankets. The seed mixes listed below include recommended mixes for both temporary and permanent seeding. These mixes,with the exception of the wetland mix, shall be applied at a rate of 120 pounds per acre. This rate can be reduced if soil amendments or slow- release fertilizers are used. Local suppliers or the local conservation district should be consulted for their recommendations because the appropriate mix depends on a variety of factors, including location, exposure, soil type, slope, and expected foot traffic. Alternative seed mixes approved by the local authority may be used. 4-16 Volume II— Construction Storm water Pollution Prevention February 2005 Table 4.1 represents the standard mix for those areas where just a temporary vegetative cover is required. Table 4.1 Temporary Erosion Control Seed Mix %Weight %Purity %Germination Chewings or annual blue grass 40 98 90 Festuca rubra var. commutata or Poa anna Perennial rye- 50 98 90 Lolium perenne Redtop or colonial bentgrass 5 92 85 Agrostis alba or Agrostis tenuis White dutch clover 5 98 90 Trifoliurn repens Table 4.2 provides just one recommended possibility for landscaping seed. Table 4.2 Landscaping Seed Mix %Weight %Purity "A Germination Perennial rye blend 70 98 90 Lolium perenne Chewings and red fescue blend 30 98 90 Festuca rubra var. commutata or Festuca rubra This turf seed mix in Table 4.3 is for dry situations where there is no need for much water. The advantage is that this mix requires very little maintenance. Table 4.3 Low-Growing Turf Seed Mix `/ Weight % Purity %Germination Dwarf tall fescue(several varieties) 45 98 90 Festuca arundinacea var. Dwarf perennial rye(Barclay) 30 98 90 Lolium perenne var. barclay Red fescue 20 98 90 Festuca rubra _ Colonial bentgrass 5 98 90 Agrostis tennis Table 4.4 presents a mix recommended for bioswales and other intermittently wet areas. Table 4.4 Bioswale Seed Mix* %, NN"eight %Purity %Germination Tall or meadow fescue 75-80 98 90 Festuca arundinacea or Festuca elatior Seaside/Creeping bentgrass 10-15 92 85 Agrostis palustris Redtop bentgrass 5-10 90 80 Agrostis alba or Agrostis gigantea *Modified Briargreen,Inc. Hydroseeding Guide Wetlands Seed Mix February 2005 Volume 11- Construction Stormwater Pollution Prevention 4-17 The seed mix shown in Table 4.5 is a recommended low-growing, relatively non-invasive seed mix appropriate for very wet areas that are not regulated wetlands. Other mixes may be appropriate, depending on the soil type and hydrology of the area. Recent research suggests that bentgrass (agrostis sp.) should be emphasized in wet-area seed mixes. Apply this mixture at a rate of 60 pounds per acre. Table 4.5 Wet Area Seed Mix* %Weight % Purity %Germination Tall or meadow fescue 60-70 98 90 Festuca arundinacea or Festuca elatior Seaside/Creeping bentgrass 10-15 98 85 Agrostis palustris Meadow foxtail 10-15 90 80 Alepocurus pratensis Alsike clover 1-6 98 90 Trifolium hybridum Redtop bentgrass 1-6 92 85 Agrostis alba *Modified Briargreen,Inc.Hydroseeding Guide Wetlands Seed Mix The meadow seed mix in Table 4.6 is recommended for areas that will be maintained infrequently or not at all and where colonization by native plants is desirable. Likely applications include rural road and utility right- of-way. Seeding should take place in September or very early October in order to obtain adequate establishment prior to the winter months. The appropriateness of clover in the mix may need to be considered, as this can be a fairly invasive species. If the soil is amended, the addition of clover may not be necessary. Table 4.6 Meadow Seed Mix %Weight %Purity %Germination Redtop or Oregon bentgrass 20 92 85 Agrostis alba or Agrostis oregonensis Red fescue 70 98 90 Festuca rubra White dutch clover 10 98 90 Trifolium repens Maintenance • Any seeded areas that fail to establish at least 80 percent cover(100 Standards percent cover for areas that receive sheet or concentrated flows) shall be reseeded. If reseeding is ineffective, an alternate method, such as sodding, mulching, or nets/blankets, shall be used. If winter weather prevents adequate grass growth,this time limit may be relaxed at the discretion of the local authority when sensitive areas would otherwise be protected. 4-18 Volume II— Construction Storm water Pollution Prevention February 2005 • After adequate cover is achieved, any areas that experience erosion shall be reseeded and protected by mulch. If the erosion problem is drainage related, the problem shall be fixed and the eroded area reseeded and protected by mulch. • Seeded areas shall be supplied with adequate moisture, but not watered to the extent that it causes runoff. February 2005 Volume II— Construction Storm water Pollution Prevention 4-19 BMP C121: Mulching Purpose The purpose of mulching soils is to provide immediate temporary protection from erosion. Mulch also enhances plant establishment by conserving moisture,holding fertilizer, seed, and topsoil in place, and moderating soil temperatures. There is an enormous variety of mulches that can be used. Only the most common types are discussed in this section. Conditions of Use As a temporary cover measure,mulch should be used: • On disturbed areas that require cover measures for less than 30 days. • As a cover for seed during the wet season and during the hot summer months. • During the wet season on slopes steeper than 3H:1V with more than 10 feet of vertical relief. • Mulch may be applied at any time of the year and must be refreshed periodically. Design and For mulch materials, application rates, and specifications, see Table 4.7. Installation Note: Thicknesses may be increased for disturbed areas in or near Specifications sensitive areas or other areas highly susceptible to erosion. Mulch used within the ordinary high-water mark of surface waters should be selected to minimize potential flotation of organic matter. Composted organic materials have higher specific gravities (densities)than straw, wood, or chipped material. Maintenance • The thickness of the cover must be maintained. Standards • Any areas that experience erosion shall be remulched and/or protected with a net or blanket. If the erosion problem is drainage related,then the problem shall be fixed and the eroded area remulched. 4-20 Volume ll— Construction Stormwater Pollution Prevention February 2005 Table 4.7 Mulch Standards and Guidelines Mulch Application Material Quality Standards Rates Remarks Straw Air-dried;free from 2"-3"thick;5 Cost-effective protection when applied with adequate undesirable seed and bales per 1000 sf thickness. Hand-application generally requires greater coarse material. or 2-3 tons per thickness than blown straw.The thickness of straw may be acre reduced by half when used in conjunction with seeding. In windy areas straw must be held in place by crimping,using a tackifier,or covering with netting. Blown straw always has to be held in place with a tackifier as even light winds will blow it away.Straw,however,has several deficiencies that should be considered when selecting mulch materials.It often introduces and/or encourages the propagation of weed species and it has no significant long-term benefits. Straw should be used only if mulches with long-term benefits are unavailable locally. It should also not be used within the ordinary high-water elevation of surface waters(due to flotation). Hydromulch No growth Approx.25-30 Shall be applied with hydromulcher. Shall not be used inhibiting factors. lbs per 1000 sf without seed and tackifier unless the application rate is at or 1500 -2000 least doubled. Fibers longer than about 3/4-1 inch clog lbs per acre hydromulch equipment. Fibers should be kept to less than 3/4 inch. Composted No visible water or 2"thick min.; More effective control can be obtained by increasing Mulch and dust during approx. 100 tons thickness to 3". Excellent mulch for protecting final grades Compost handling. Must be per acre(approx. until landscaping because it can be directly seeded or tilled purchased from 800 lbs per yard) into soil as an amendment. Composted mulch has a coarser supplier with Solid size gradation than compost.It is more stable and practical Waste Handling to use in wet areas and during rainy weather conditions. Permit(unless exempt). Chipped Site Average size shall 2"minimum This is a cost-effective way to dispose of debris from Vegetation be several inches. thickness clearing and grubbing,and it eliminates the problems Gradations from associated with burning. Generally,it should not be used on fines to 6 inches in slopes above approx. 10%because of its tendency to be length for texture, transported by runoff. It is not recommended within 200 variation,and feet of surface waters. If seeding is expected shortly after interlocking mulch,the decomposition of the chipped vegetation may tie properties. up nutrients important to grass establishment. Wood-based No visible water or 2"thick;approx. This material is often called"hog or hogged fuel." It is Mulch dust during 100 tons per acre usable as a material for Stabilized Construction Entrances handling. Must be (approx.800 lbs. (BMP C 105)and as a mulch. The use of mulch ultimately purchased from a per cubic yard) improves the organic matter in the soil. Special caution is supplier with a Solid advised regarding the source and composition of wood- Waste Handling based mulches. Its preparation typically does not provide Permit or one any weed seed control,so evidence of residual vegetation in exempt from solid its composition or known inclusion of weed plants or seeds waste regulations. should be monitored and prevented(or minimized). February 2005 Volume 11— Construction Stormwater Pollution Prevention 4-21 BMP C125: Topsoiling Purpose To provide a suitable growth medium for final site stabilization with vegetation. While not a permanent cover practice in itself,topsoiling is an integral component of providing permanent cover in those areas where there is an unsuitable soil surface for plant growth. Native soils and disturbed soils that have been organically amended not only retain much more stormwater,but they also serve as effective biofilters for urban pollutants and,by supporting more vigorous plant growth, reduce the water, fertilizer and pesticides needed to support installed landscapes. Topsoil does not include any subsoils but only the material from the top several inches including organic debris. Conditions of • Native soils should be left undisturbed to the maximum extent - • Use practicable. Native soils disturbed during clearing and grading should be restored,to the maximum extent practicable, to a condition where moisture-holding capacity is equal to or better than the original site conditions. This criterion can be met by using on-site native topsoil, incorporating amendments into on-site soil, or importing blended topsoil. • Topsoiling is a required procedure when establishing vegetation on shallow soils, and soils of critically low pH (high acid) levels. • Stripping of existing,properly functioning soil system and vegetation for the purpose of topsoiling during construction is not acceptable. If an existing soil system is functioning properly it shall be preserved in its undisturbed and uncompacted condition. • Depending on where the topsoil comes from, or what vegetation was on site before disturbance, invasive plant seeds may be included and could cause problems for establishing native plants, landscaped areas, or grasses. • Topsoil from the site will contain mycorrhizal bacteria that are necessary for healthy root growth and nutrient transfer. These native mycorrhiza are acclimated to the site and will provide optimum conditions for establishing grasses. Commercially available mycorrhiza products should be used when topsoil is brought in from off-site. Design and If topsoiling is to be done,the following items should be considered: Installation • Maximize the depth of the topsoil wherever possible to provide the Specifications maximum possible infiltration capacity and beneficial growth medium. Topsoil depth shall be at least 8 inches with a minimum organic content of 10 percent dry weight and pH between 6.0 and 8.0 or matching the pH of the undisturbed soil. This can be accomplished either by returning native topsoil to the site and/or incorporating organic amendments. Organic amendments should be incorporated to a minimum 8-inch depth except where tree roots or other natural February 2005 Volume Il— Construction Storm water Pollution Prevention 4-29 1 features limit the depth of incorporation. Subsoils below the 12-inch depth should be scarified at least 2 inches to avoid stratified layers, where feasible. The decision to either layer topsoil over a subgrade or incorporate topsoil into the underlying layer may vary depending on the planting specified. • If blended topsoil is imported,then fines should be limited to 25 percent passing through a 200 sieve. • The final composition and construction of the soil system will result in a natural selection or favoring of certain plant species over time. For example,recent practices have shown that incorporation of topsoil may favor grasses,while layering with mildly acidic,high-carbon amendments may favor more woody vegetation. • Locate the topsoil stockpile so that it meets specifications and does not interfere with work on the site. It may be possible to locate more than one pile in proximity to areas where topsoil will be used. • Allow sufficient time in scheduling for topsoil to be spread prior to seeding, sodding, or planting. • Care must be taken not to apply to subsoil if the two soils have contrasting textures. Sandy topsoil over clayey subsoil is a particularly poor combination, as water creeps along the junction between the soil layers and causes the topsoil to slough. • If topsoil and subsoil are not properly bonded,water will not infiltrate the soil profile evenly and it will be difficult to establish vegetation. The best method to prevent a lack of bonding is to actually work the topsoil into the layer below for a depth of at least 6 inches. • Ripping or re-structuring the subgrade may also provide additional benefits regarding the overall infiltration and interflow dynamics of the soil system. • Field exploration of the site shall be made to determine if there is surface soil of sufficient quantity and quality to justify stripping. Topsoil shall be friable and loamy(loam, sandy loam, silt loam,sandy clay loam, clay loam). Areas of natural ground water recharge should be avoided. • Stripping shall be confined to the immediate construction area. A 4-to 6-inch stripping depth is common,but depth may vary depending on the particular soil. All surface runoff control structures shall be in place prior to stripping. Stockpiling of topsoil shall occur in the following manner: • Side slopes of the stockpile shall not exceed 2:1. • An interceptor dike with gravel outlet and silt fence shall surround all topsoil stockpiles between October 1 and April 30. Between May 1 4-30 Volume ll— Construction Stormwater Pollution Prevention February 2005 and September 30, an interceptor dike with gravel outlet and silt fence shall be installed if the stockpile will remain in place for a longer period of time than active construction grading. • Erosion control seeding or covering with clear plastic or other mulching materials of stockpiles shall be completed within 2 days (October 1 through April 30)or 7 days(May 1 through September 30) of the formation of the stockpile. Native topsoil stockpiles shall not be covered with plastic. • Topsoil shall not be placed while in a frozen or muddy condition, when the subgrade is excessively wet,or when conditions exist that may otherwise be detrimental to proper grading or proposed sodding or seeding. • Previously established grades on the areas to be topsoiled shall be maintained according to the approved plan. • When native topsoil is to be stockpiled and reused the following should apply to ensure that the mycorrhizal bacterial, earthworms, and other beneficial organisms will not be destroyed: 1. Topsoil is to be re-installed within 4 to 6 weeks; 2. Topsoil is not to become saturated with water; 3. Plastic cover is not allowed. Maintenance • Inspect stockpiles regularly, especially after large storm events. Standards Stabilize any areas that have eroded. February 2005 Volume ll— Construction Stormwater Pollution Prevention 4-31 BMP C140: Dust Control Purpose Dust control prevents wind transport of dust from disturbed soil surfaces onto roadways, drainage ways, and surface waters. Conditions of Use • In areas (including roadways) subject to surface and air movement of dust where on-site and off-site impacts to roadways, drainage ways, or surface waters are likely. Design and • Vegetate or mulch areas that will not receive vehicle traffic. In areas Installation where planting,mulching, or paving is impractical, apply gravel or Specifications landscaping rock. • Limit dust generation by clearing only those areas where immediate activity will take place, leaving the remaining area(s)in the original condition, if stable. Maintain the original ground cover as long as practical. • Construct natural or artificial windbreaks or windscreens. These may be designed as enclosures for small dust sources. • Sprinkle the site with water until surface is wet. Repeat as needed. To prevent carryout of mud onto street, refer to Stabilized Construction Entrance(BMP C105). • Irrigation water can be used for dust control. Irrigation systems should be installed as a first step on sites where dust control is a concern. • Spray exposed soil areas with a dust palliative, following the manufacturer's instructions and cautions regarding handling and application. Used oil is prohibited from use as a dust suppressant. Local governments may approve other dust palliatives such as calcium chloride or PAM. • PAM(BMP C 126) added to water at a rate of 0.5 lbs.per 1,000 gallons of water per acre and applied from a water truck is more effective than water alone. This is due to the increased infiltration of water into the soil and reduced evaporation. In addition, small soil particles are bonded together and are not as easily transported by wind. Adding PAM may actually reduce the quantity of water needed for dust control, especially in eastern Washington. Since the wholesale cost of PAM is about$4.00 per pound, this is an extremely cost- effective dust control method. Techniques that can be used for unpaved roads and lots include: • Lower speed limits. High vehicle speed increases the amount of dust stirred up from unpaved roads and lots. • Upgrade the road surface strength by improving particle size, shape, and mineral types that make up the surface and base materials. 4-40 Volume 11— Construction Storm water Pollution Prevention February 2005 • Add surface gravel to reduce the source of dust emission. Limit the amount of fine particles (those smaller than .075 mm)to 10 to 20 percent. • Use geotextile fabrics to increase the strength of new roads or roads undergoing reconstruction. • Encourage the use of alternate,paved routes, if available. • Restrict use by tracked vehicles and heavy trucks to prevent damage to road surface and base. • Apply chemical dust suppressants using the admix method,blending the product with the top few inches of surface material. Suppressants may also be applied as surface treatments. • Pave unpaved permanent roads and other trafficked areas. • Use vacuum street sweepers. • Remove mud and other dirt promptly so it does not dry and then turn into dust. • Limit dust-causing work on windy days. • Contact your local Air Pollution Control Authority for guidance and training on other dust control measures. Compliance with the local Air Pollution Control Authority constitutes compliance with this BMP. Maintenance Respray area as necessary to keep dust to a minimum. Standards February 2005 Volume 11— Construction Stormwater Pollution Prevention 4-41 BMP C150: Materials On Hand Purpose Quantities of erosion prevention and sediment control materials can be kept on the project site at all times to be used for emergency situations such as unexpected heavy summer rains. Having these materials on-site reduces the time needed to implement BMPs when inspections indicate that existing BMPs are not meeting the Construction SWPPP requirements. In addition, contractors can save money by buying some materials in bulk and storing them at their office or yard. Conditions of Use • Construction projects of any size or type can benefit from having materials on hand. A small commercial development project could have a roll of plastic and some gravel available for immediate protection of bare soil and temporary berm construction. A large earthwork project, such as highway construction,might have several tons of straw, several rolls of plastic, flexible pipe, sandbags, geotextile fabric and steel "T"posts. • Materials are stockpiled and readily available before any site clearing, grubbing, or earthwork begins. A large contractor or developer could keep a stockpile of materials that are available to be used on several projects. • If storage space at the project site is at a premium,the contractor could maintain the materials at their office or yard. The office or yard must be less than an hour from the project site. Design and Depending on project type, size, complexity, and length, materials and Installation quantities will vary. A good minimum that will cover numerous situations Specifications includes: Material Measure Quantity Clear Plastic, 6 mil 100 foot roll 1-2 Drainpipe, 6 or 8 inch diameter 25 foot section 4-6 Sandbags, filled each 25-50 Straw Bales for mulching, approx. 50#each 10-20 Quarry Spalls ton 2-4 Washed Gravel cubic yard 2-4 Geotextile Fabric 100 foot roll 1-2 Catch Basin Inserts each 2-4 Steel"T"Posts each 12-24 Maintenance • All materials with the exception of the quarry spalls, steel "T"posts, Standards and gravel should be kept covered and out of both sun and rain. • Re-stock materials used as needed. 4-42 Volume II— Construction Stormwater Pollution Prevention February 2005 BMP C151: Concrete Handling Purpose Concrete work can generate process water and slurry that contain fine particles and high pH, both of which can violate water quality standards in the receiving water. This BMP is intended to minimize and eliminate concrete process water and slurry from entering waters of the state. Conditions of Use Any time concrete is used,these management practices shall be utilized. Concrete construction projects include, but are not limited to,the following: • Curbs • Sidewalks • Roads • Bridges • Foundations • Floors • Runways Design and • Concrete truck chutes,pumps, and internals shall be washed out only Installation into formed areas awaiting installation of concrete or asphalt. Specifications • Unused concrete remaining in the truck and pump shall be returned to the originating batch plant for recycling. • Hand tools including,but not limited to, screeds, shovels, rakes, floats, and trowels shall be washed off only into formed areas awaiting installation of concrete or asphalt. • Equipment that cannot be easily moved, such as concrete pavers, shall only be washed in areas that do not directly drain to natural or constructed stormwater conveyances. • Washdown from areas such as concrete aggregate driveways shall not drain directly to natural or constructed stormwater conveyances. • When no formed areas are available,washwater and leftover product shall be contained in a lined container. Contained concrete shall be disposed of in a manner that does not violate groundwater or surface water quality standards. Maintenance Containers shall be checked for holes in the liner daily during concrete Standards pours and repaired the same day. February 2005 Volume II— Construction Stormwater Pollution Prevention 4-43 BMP C220: Storm Drain Inlet Protection Purpose To prevent coarse sediment from entering drainage systems prior to permanent stabilization of the disturbed area. Conditions of Use Where storm drain inlets are to be made operational before permanent stabilization of the disturbed drainage area. Protection should be provided for all storm drain inlets downslope and within 500 feet of a disturbed or construction area,unless the runoff that enters the catch basin will be conveyed to a sediment pond or trap. Inlet protection may be used anywhere to protect the drainage system. It is likely that the drainage system will still require cleaning. Table 4.9 lists several options for inlet protection. All of the methods for storm drain inlet protection are prone to plugging and require a high frequency of maintenance. Drainage areas should be limited to 1 acre or less. Emergency overflows may be required where stormwater ponding would cause a hazard. If an emergency overflow is provided, additional end-of-pipe treatment may be required. Table 4.9 Storm Drain Inlet Protetion Applicable for Type of Inlet Emergency Paved/ Earthen Protection Overflow Surfaces Conditions of Use Drop Inlet Protection Excavated drop inlet Yes, Earthen Applicable for heavy flows. Easy protection temporary to maintain. Large area flooding will Requirement: 30'X 30'/acre occur Block and gravel drop Yes Paved or Earthen Applicable for heavy concentrated inlet protection flows. Will not pond. Gravel and wire drop No Applicable for heavy concentrated inlet protection flows. Will pond. Can withstand traffic. Catch basin filters Yes Paved or Earthen Frequent maintenance required. Curb Inlet Protection Curb inlet protection Small capacity Paved Used for sturdy, more compact with a wooden weir overflow installation. Block and gravel curb Yes Paved Sturdy,but limited filtration. inlet protection Culvert Inlet Protection Culvert inlet sediment 18 month expected life. trap 4-82 Volume I!— Construction Stormwater Pollution Prevention February 2005 Design and Excavated Drop Inlet Protection - An excavated impoundment around the Installation storm drain. Sediment settles out of the stormwater prior to entering the Specifications storm drain. • Depth 1-2 ft as measured from the crest of the inlet structure. • Side Slopes of excavation no steeper than 2:1. • Minimum volume of excavation 35 cubic yards. • Shape basin to fit site with longest dimension oriented toward the longest inflow area. • Install provisions for draining to prevent standing water problems. • Clear the area of all debris. • Grade the approach to the inlet uniformly. • Drill weep holes into the side of the inlet. • Protect weep holes with screen wire and washed aggregate. • Seal weep holes when removing structure and stabilizing area. • It may be necessary to build a temporary dike to the down slope side of the structure to prevent bypass flow. Block and Gravel Filter- A barrier formed around the storm drain inlet with standard concrete blocks and gravel. See Figure 4.14. • Height 1 to 2 feet above inlet. • Recess the first row 2 inches into the ground for stability. • Support subsequent courses by placing a 2x4 through the block opening. • Do not use mortar. • Lay some blocks in the bottom row on their side for dewatering the pool. • Place hardware cloth or comparable wire mesh with '/2-inch openings over all block openings. • Place gravel just below the top of blocks on slopes of 2:1 or flatter. • An alternative design is a gravel donut. • Inlet slope of 3:1. • Outlet slope of 2:1. • 1-foot wide level stone area between the structure and the inlet. • Inlet slope stones 3 inches in diameter or larger. • Outlet slope use gravel 1/4-to 3 -inch at a minimum thickness of 1-foot. February 2005 Volume Il— Construction Stormwater Pollution Prevention 4-83 Plan View A Drain Grate .,A,- �°N° o°eo °0� 4 ?.a " Q° oW �� � �,e0,„, 0o0�oo��" o.g' o 4 ) . a000 2!?-1 '0 ap00,0 Concrete v�o0 .,,,,�o.. 0 Block •.b°: opo o „VA dQ; o .-..2::°•.3,..,c:`,)6.,,(?o -- i•Oc): .Soo' 'ock Gravel :p06 o a1°• o�oo Backfill%a 592'006° ( Ds•— •�°.c.. ma..•,,o;W0 -.; o,.4c.O Q°° •00•o•aoOpp0 �� p ft oo�o A Section A - A Concrete Block Wire Screen or Filter Fabric Gravel Backfill Overflow Water Ponding Height .1\ o o :!� ►o0° Waterl mn. � 0 °_ .. . , = i %U4I/UIVA •.� • P , : . \ \\ \\ \\ \\ brop Inlet \\ \\ \\ \\ \ Notes: 1.Drop inlet sediment barriers are to be used for small,nearly level drainage areas.(less than 5%) 2.Excavate a basin of sufficient size adjacent to the drop inlet. 3.The top of the structure(ponding height)must be well below the ground elevation downslope to prevent runoff from bypassing the inlet. A temporary dike may be necessary on the dowslope side of the structure. Figure 4.14—Block and Gravel Filter Gravel and Wire Mesh Filter- A gravel barrier placed over the top of the inlet. This structure does not provide an overflow. • Hardware cloth or comparable wire mesh with '/2-inch openings. • Coarse aggregate. • Height 1-foot or more, 18 inches wider than inlet on all sides. • Place wire mesh over the drop inlet so that the wire extends a minimum of 1-foot beyond each side of the inlet structure. • If more than one strip of mesh is necessary, overlap the strips. • Place coarse aggregate over the wire mesh. • The depth of the gravel should be at least 12 inches over the entire inlet opening and extend at least 18 inches on all sides. 4-84 Volume ll— Construction Stormwater Pollution Prevention February 2005 Catchbasin Filters -Inserts should be designed by the manufacturer for use at construction sites. The limited sediment storage capacity increases the amount of inspection and maintenance required, which may be daily for heavy sediment loads. The maintenance requirements can be reduced by combining a catchbasin filter with another type of inlet protection. This type of inlet protection provides flow bypass without overflow and therefore may be a better method for inlets located along active rights-of- way. • 5 cubic feet of storage. • Dewatering provisions. • High-flow bypass that will not clog under normal use at a construction site. • The catchbasin filter is inserted in the catchbasin just below the grating. Curb Inlet Protection with Wooden Weir— Barrier formed around a curb inlet with a wooden frame and gravel. • Wire mesh with Y2-inch openings. • Extra strength filter cloth. • Construct a frame. • Attach the wire and filter fabric to the frame. • Pile coarse washed aggregate against wire/fabric. • Place weight on frame anchors. Block and Gravel Curb Inlet Protection—Barrier formed around an inlet with concrete blocks and gravel. See Figure 4.14. • Wire mesh with Y2-inch openings. • Place two concrete blocks on their sides abutting the curb at either side of the inlet opening. These are spacer blocks. • Place a 2x4 stud through the outer holes of each spacer block to align the front blocks. • Place blocks on their sides across the front of the inlet and abutting the spacer blocks. • Place wire mesh over the outside vertical face. • Pile coarse aggregate against the wire to the top of the barrier. Curb and Gutter Sediment Barrier—Sandbag or rock berm(riprap and aggregate) 3 feet high and 3 feet wide in a horseshoe shape. See Figure 4.16. • Construct a horseshoe shaped berm, faced with coarse aggregate if using riprap, 3 feet high and 3 feet wide, at least 2 feet from the inlet. • Construct a horseshoe shaped sedimentation trap on the outside of the berm sized to sediment trap standards for protecting a culvert inlet. February 2005 Volume II— Construction Storm water Pollution Prevention 4-85 Maintenance • Catch basin filters should be inspected frequently, especially after Standards storm events. If the insert becomes clogged, it should be cleaned or replaced. • For systems using stone filters: If the stone filter becomes clogged with sediment,the stones must be pulled away from the inlet and cleaned or replaced. Since cleaning of gravel at a construction site may be difficult, an alternative approach would be to use the clogged stone as fill and put fresh stone around the inlet. • Do not wash sediment into storm drains while cleaning. Spread all excavated material evenly over the surrounding land area or stockpile and stabilize as appropriate. 4-86 Volume II— Construction Storm water Pollution Prevention February 2005 Plan View iBack of Sidewalk A Catch Basin 0 2x4 Wood Stud Back of Curb Concrete Block Curb Inlet '10 ROO •.� • RaO�OO Q• c-j ": Plan View (•-• Back of Sidewalk Burlap Sacks to Catch Basin Overlap onto Curb Curb Inlet Back of Curb) RUNOFF ` RUNOFF SPILLWAY/ •1 Gravel Filled Sandbags Stacked Tightly NOTES: 1.Place curb type sediment barriers on gently sloping street segments,where water can pond and allow sediment to separate from runoff. 2.Sandbags of either burlap or woven'geotextile'fabric,are filled with gravel,layered and packed tightly. 3.Leave a one sandbag gap in the top row to provide a spillway for overflow. 4.Inspect barriers and remove sediment after each storm event.Sediment and gravel must be removed from the traveled way immediately. Figure 4.16—Curb and Gutter Barrier 4-88 Volume Il—Construction Stormwater Pollution Prevention February 2005 BMP C233: Silt Fence Purpose Use of a silt fence reduces the transport of coarse sediment from a construction site by providing a temporary physical barrier to sediment and reducing the runoff velocities of overland flow. See Figure 4.19 for details on silt fence construction. Conditions of Use Silt fence may be used downslope of all disturbed areas. • Silt fence is not intended to treat concentrated flows,nor is it intended to treat substantial amounts of overland flow. Any concentrated flows must be conveyed through the drainage system to a sediment pond. The only circumstance in which overland flow can be treated solely by a silt fence, rather than by a sediment pond, is when the area draining to the fence is one acre or less and flow rates are less than 0.5 cfs. • Silt fences should not be constructed in streams or used in V-shaped ditches. They are not an adequate method of silt control for anything deeper than sheet or overland flow. Joints in filter fabric shall be spliced at posts.Use staples,wire rings or 2"x2"by 14 Ga.wire or equivalent to attach fabric to posts equivalent, if standard - strength fabric used I rri S' 1 Filter fabric — c II E II I a II "fin=:n:=n:'=,'n:'=':n:=,':n:= �i�;l _'n -rr_=5 i :: _ J 6'max 1 T" Minimum 4"x4"trench / —I E N Backfill trench with native soil Post spacing may be increased -\ or 3/4"-1.5"washed gravel to 8'if wire backing is used 2"x2"wood posts,steel fence posts,or equivalent Figure 4.19— Silt Fence Design and • Drainage area of 1 acre or less or in combination with sediment basin Installation in a larger site. Specifications • Maximum slope steepness (normal (perpendicular)to fence line) 1:1. • Maximum sheet or overland flow path length to the fence of 100 feet. • No flows greater than 0.5 cfs. • The geotextile used shall meet the following standards. All geotextile properties listed below are minimum average roll values(i.e.,the test result for any sampled roll in a lot shall meet or exceed the values shown in Table 4.10): 4-94 Volume II— Construction Storm water Pollution Prevention February 2005 Table 4.10 Geotextile Standards Polymeric Mesh AOS 0.60 mm maximum for slit film wovens(#30 sieve). 0.30 (ASTM D4751) mm maximum for all other geotextile types(#50 sieve). 0.15 mm minimum for all fabric types(#100 sieve). Water Permittivity 0.02 sec' minimum (ASTM D4491) Grab Tensile Strength 180 lbs.Minimum for extra strength fabric. (ASTM D4632) 100 lbs minimum for standard strength fabric. Grab Tensile Strength 30%maximum (ASTM D4632) Ultraviolet Resistance 70%minimum (ASTM D4355) • Standard strength fabrics shall be supported with wire mesh, chicken wire, 2-inch x 2-inch wire, safety fence, or jute mesh to increase the strength of the fabric. Silt fence materials are available that have synthetic mesh backing attached. • Filter fabric material shall contain ultraviolet ray inhibitors and stabilizers to provide a minimum of six months of expected usable construction life at a temperature range of 0°F. to 120°F. • 100 percent biodegradable silt fence is available that is strong, long lasting, and can be left in place after the project is completed, if permitted by local regulations. • Standard Notes for construction plans and specifications follow. Refer to Figure 4.19 for standard silt fence details. The contractor shall install and maintain temporary silt fences at the locations shown in the Plans. The silt fences shall be constructed in the areas of clearing, grading, or drainage prior to starting those activities. A silt fence shall not be considered temporary if the silt fence must function beyond the life of the contract. The silt fence shall prevent soil carried by runoff water from going beneath,through, or over the top of the silt fence,but shall allow the water to pass through the fence. The minimum height of the top of silt fence shall be 2 feet and the maximum height shall be 2Y2 feet above the original ground surface. The geotextile shall be sewn together at the point of manufacture, or at an approved location as determined by the Engineer,to form geotextile lengths as required. All sewn seams shall be located at a support post. Alternatively,two sections of silt fence can be overlapped,provided the Contractor can demonstrate,to the satisfaction of the Engineer,that the overlap is long enough and that the adjacent fence sections are close enough together to prevent silt laden water from escaping through the fence at the overlap. February 2005 Volume ll— Construction Storm water Pollution Prevention 4-95 The geotextile shall be attached on the up-slope side of the posts and support system with staples, wire, or in accordance with the manufacturer's recommendations. The geotextile shall be attached to the posts in a manner that reduces the potential for geotextile tearing at the staples,wire, or other connection device. Silt fence back-up support for the geotextile in the form of a wire or plastic mesh is dependent on the properties of the geotextile selected for use. If wire or plastic back-up mesh is used, the mesh shall be fastened securely to the up-slope of the posts with the geotextile being up-slope of the mesh back-up support. The geotextile at the bottom of the fence shall be buried in a trench to a minimum depth of 4 inches below the ground surface. The trench shall be backfilled and the soil tamped in place over the buried portion of the geotextile, such that no flow can pass beneath the fence and scouring can not occur. When wire or polymeric back-up support mesh is used, the wire or polymeric mesh shall extend into the trench a minimum of 3 inches. The fence posts shall be placed or driven a minimum of 18 inches. A minimum depth of 12 inches is allowed if topsoil or other soft subgrade soil is not present and a minimum depth of 18 inches cannot be reached. Fence post depths shall be increased by 6 inches if the fence is located on slopes of 3:1 or steeper and the slope is perpendicular to the fence. If required post depths cannot be obtained, the posts shall be adequately secured by bracing or guying to prevent overturning of the fence due to sediment loading. Silt fences shall be located on contour as much as possible, except at the ends of the fence,where the fence shall be turned uphill such that the silt fence captures the runoff water and prevents water from flowing around the end of the fence. If the fence must cross contours,with the exception of the ends of the fence, gravel check dams placed perpendicular to the back of the fence shall be used to minimize concentrated flow and erosion along the back of the fence. The gravel check dams shall be approximately 1- foot deep at the back of the fence. It shall be continued perpendicular to the fence at the same elevation until the top of the check dam intercepts the ground surface behind the fence. The gravel check dams shall consist of crushed surfacing base course,gravel backfill for walls, or shoulder ballast. The gravel check dams shall be located every 10 feet along the fence where the fence must cross contours. The slope of the fence line where contours must be crossed shall not be steeper than 3:1. Wood, steel or equivalent posts shall be used. Wood posts shall have minimum dimensions of 2 inches by 2 inches by 3 feet minimum length, and shall be free of defects such as knots, splits, or gouges. 4-96 Volume II— Construction Storm water Pollution Prevention February 2005 Steel posts shall consist of either size No. 6 rebar or larger,ASTM A 120 steel pipe with a minimum diameter of 1-inch, U, T, L, or C shape steel posts with a minimum weight of 1.35 lbs./ft. or other steel posts having equivalent strength and bending resistance to the post sizes listed. The spacing of the support posts shall be a maximum of 6 feet. Fence back-up support, if used, shall consist of steel wire with a maximum mesh spacing of 2 inches, or a prefabricated polymeric mesh. The strength of the wire or polymeric mesh shall be equivalent to or greater than 180 lbs. grab tensile strength. The polymeric mesh must be as resistant to ultraviolet radiation as the geotextile it supports. • Silt fence installation using the slicing method specification details follow. Refer to Figure 4.20 for slicing method details. The base of both end posts must be at least 2 to 4 inches above the top of the silt fence fabric on the middle posts for ditch checks to drain properly. Use a hand level or string level, if necessary,to mark base points before installation. Install posts 3 to 4 feet apart in critical retention areas and 6 to 7 feet apart in standard applications. Install posts 24 inches deep on the downstream side of the silt fence, and as close as possible to the fabric, enabling posts to support the fabric from upstream water pressure. Install posts with the nipples facing away from the silt fence fabric. Attach the fabric to each post with three ties, all spaced within the top 8 inches of the fabric. Attach each tie diagonally 45 degrees through the fabric, with each puncture at least 1 inch vertically apart. In addition, each tie should be positioned to hang on a post nipple when tightening to prevent sagging. Wrap approximately 6 inches of fabric around the end posts and secure with 3 ties. No more than 24 inches of a 36-inch fabric is allowed above ground level. The rope lock system must be used in all ditch check applications. The installation should be checked and corrected for any deviation before compaction. Use a flat-bladed shovel to tuck fabric deeper into the ground if necessary. Compaction is vitally important for effective results. Compact the soil immediately next to the silt fence fabric with the front wheel of the tractor, skid steer, or roller exerting at least 60 pounds per square inch. Compact the upstream side first and then each side twice for a total of four trips. February 2005 Volume II— Construction Stormwater Pollution Prevention 4-97 • Any damage shall be repaired immediately. ;faintenance • If concentrated flows are evident uphill of the fence,they must be Standards intercepted and conveyed to a sediment pond. • It is important to check the uphill side of the fence for signs of the fence clogging and acting as a barrier to flow and then causing channelization of flows parallel to the fence. If this occurs, replace the fence or remove the trapped sediment. • Sediment deposits shall either be removed when the deposit reaches approximately one-third the height of the silt fence, or a second silt fence shall be installed. • If the filter fabric (geotextile)has deteriorated due to ultraviolet breakdown, it shall be replaced. Ponding height POST SPACING: max.24- 7'max.on open runs i 4'max.on pooling areae Top o(Fabric Attach fabric to • i 1IIIII� upstream side of post . 'to 8tOr • ° i FLOW ohm.over each rrd.of POST DEPTH: silt fent.2 to 4 time• As uMreh below ground with device exerting as fabric above ground BO p.s.l.or greater 100%cempactio}i 100%compaction �. \4\/ /\/ f daitlas Ia U•Cf rl" Ilitt \ /A 4/r /�/ \ .....i.• _,41L-,7!!.411.,:: \ \e. ATTACHMENT oET,ns:/ / / //\ * \/%\%moi\\ a Gather fabric at poxes.I needed. //\\\//\\j \\�\ ��/\\,/\\ a tlbiize three ties per pox,at within top S•of fabric. �/\%�// \%/�\/*i '. •. •Position each tie diagonally,puncturing holes vertically \\\/ \��/ \\\\ \\\\� a tion*,rm of 1•apart. •Mang each tie on a post nipple and tighten securely No more than 240 of a 330 fabric use cable ties(stubs)or sols wire. is allowed above ground. Rol of sill fence 4 Operation Post I� after d after �� compaction V,^ Fabric /above Bound Silt Fence ./* 14;71W,* 577. :♦ 0 ;O".i� $ t _ ��!� j•�F%�i1"/A/ LNIFF/1/// \\\'ia,i \�a 200-300mm .'*,>,,; }ave. MAn Horizontal chisel pont Siting blade (76 mm width) (18 mm width) Completed Mtalatfon Vibratory plow is not acceptable because of horizontal compaction Figure 4.20—Silt Fence Installation by Slicing Method 4-98 Volume 1l— Construction Stormwater Pollution Prevention February 2005 I Storm water Pollution Prevention Plan \ppendix C — Alternative BMPs The following includes a list of possible alternative BMPs for each of the 12 elements not described in the main SWPPP text. This list can be referenced in the event a BMP for a specific element is not functioning as designed and an alternative BMP needs to be implemented. Element#1 -Mark Clearing Limits BMP C101: Preserving Natural Vegetation BMP C 102: Buffer Zones BMP C104: Stake and Wire Fence Element#2 -Establish Construction Access BMP C106: Wheel Wash BMP C 107: Construction Road/Parking Area Stabilization Element#3 - Control Flow Rates BMP C240: Temporary Sediment Trap BMP C251: Construction Stormwater Filtration Element#4-Install Sediment Controls BMP C230: Straw Bale Barrier Element#5- Stabilize Soils BMP C124: Sodding BMP C 122: Nets and Blankets BMP C123: Plastic Covering Element#6- Protect Slopes N/A Element#8- Stabilize Channels and Outlets BMP C200: Interceptor Dike and Swale BMP C207: Check Dams 25 13245.008.docx Storm water Pollution Prevention Plan Element#9—Control Pollutants BMP C153: Material Delivery, Storage and Containment Element#10 - Control Dewatering BMP C 1 52: Sawcutting and Surfacing Pollution Prevention Elements #11 & #12 —Maintain BMP's and Manage Project BMP C 160: Certified Erosion and Sediment Control Lead 26 13245.008.docx Stormwater Pollution Prevention Plan Appendix D — General Permit 27 13245.008.docx f tifA%'F• 4 i 0 ;:r •cfjo jt STATE OF WASHINGTON DEPARTMENT OF ECOLOGY PO Box 47600 • Olympia, WA 98504-7600 •360-407-6000 711 for Washington Relay Service • Persons with a speech disability can call 877-833-6341 July 16, 2013 Rob Law The Kroger Company P.O. Box 42121 Portland, OR 97202 RE: Coverage under the Construction Stormwater General Permit Permit number: WAR127212 Site Name: Fred Meyer Fuel Center No. 459 -Renton Center Location: 405 Rainier Avenue South Renton, WA County: King Disturbed Acres: 1,1 Dear Mr. Law: The Washington State Department of Ecology(Ecology)received your Notice of Intent for coverage under Ecology's Construction Stormwater General Permit(permit). This is your permit coverage letter. Your permit coverage is effective on July 16, 2013. Please retain this permit coverage letter with your permit(enclosed), stormwater pollution prevention plan (SWPPP), and site log book. These materials are the official record of permit coverage for your site. Please take time to read the entire permit and contact Ecology if you have any questions. Appeal Process You have a right to appeal coverage under the general permit to the Pollution Control Hearing Board (PCHB) within 30 days of the date of receipt of this letter. This appeal is limited to the general permit's applicability or non-applicability to a specific discharger. The appeal process is governed by chapter 43.21B RCW and chapter 371-08 WAC. "Date of receipt" is defined in RCW 43.21B.001(2). "`) �' , Rob Law July 16, 2013 Page 2 To appeal, you must do the following within 30 days of the date of receipt of this letter: • File your appeal and a copy of the permit cover page with the PCHB (see addresses below). Filing means actual receipt by the PCHB during regular business hours. • Serve a copy of your appeal and the permit cover page on Ecology in paper form- by mail or in person(see addresses below). E-mail is not accepted. You must also comply with other applicable requirements in chapter 43.21B RCW and chapter 371- 08 WAC. Address and Location Information: Street Addresses: Mailing Addresses: Department of Ecology Department of Ecology Attn: Appeals Processing Desk Attn: Appeals Processing Desk 300 Desmond Drive SE PO Box 47608 Lacey, WA 98503 Olympia, WA 98504-7608 Pollution Control Hearings Board(PCHB) Pollution Control Hearings Board 1111 Israel Road SW, Suite 301 PO Box 40903 Tumwater, WA 98501 Olympia, WA 98504-0903 Electronic Discharge Monitoring Reports (WQWebDMR) This permit requires that Permittees submit monthly discharge monitoring reports (DMRs) electronically using Ecology's secure online system, WQWebDMR. To sign up for WQWebDMR go to: www.ecy.wa.gov/programs/wq/permits/paris/webdmr.html. If you have questions, contact Tonya Wolfe at (360)407-7097 (Olympia area),or(800) 633-6193/option 3, or email WQWebPortal@ecy.wa.gov. Ecology Field Inspector Assistance If you have questions regarding stormwater management at your construction site,please contact Tracie Walters of Ecology's Northwest Regional Office in Bellevue at tracie.walters@ecy.wa.gov, or (425) 649-4484. Questions or Additional Information Ecology is committed to providing assistance. Please review our web page at: www.ecy.wa.gov/programs/wq/stormwater/construction/. If you have questions about the construction stormwater general permit, please contact Clay Keown at clay.keown@ecy.wa.gov, or (360) 407-6048. Sincerely, Bill Moore,P.E., Manager Program Development Services Section Water Quality Program Enclosure Storm water Pollution Prevention Plan 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 r 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 28 13245.008.docx Stormwater Pollution Prevention Plan permit. If the site inspection indicates that the site is out of compliance, the inspection report shall include a summary of the remedial actions required to bring the site back into compliance, as well as a schedule of implementation. i. Name,title, and signature of person conducting the site inspection; and the following statement: "I certify under penalty of law that this report is true, accurate, and complete, to the best of my knowledge and belief'. When the site inspection indicates that the site is not in compliance with any terms and conditions of the 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. 29 13245.008.docx Storm water Pollution Prevention Plan Site Inspection Form General Information Project Name: Inspector Name: Title: CESCL# : Date: Time: Inspection Type: ❑ After a rain event ❑ Weekly ❑ Turbidity/transparency benchmark exceedance ❑ Other Weather Precipitation Since last inspection In last 24 hours Description of General Site Conditions: Inspection of BMPs Element 1: Mark Clearing Limits BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP Element 2: Establish Construction Access BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP 30 13245.008.docx Stormwater Pollution Prevention Plan Element 3: Control Flow Rates BMP: Location Inspected Functioning Problem/Corrective Action YN Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP Element 4: Install Sediment Controls BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP 31 13245.008.docx Storm water Pollution Prevention Plan Element 5: Stabilize Soils BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Inspected Functioning LocationY N Y N NIP Problem/Corrective Action Element 6: Protect Slopes BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP 32 13245.008.docx Stormwater Pollution Prevention Plan Element 7: Protect Drain Inlets BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP Element 8: Stabilize Channels and Outlets BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP 33 13245.008.docx Stormwater Pollution Prevention Plan Element 9: Control Pollutants BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP Element 10: Control Dewatering BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP 34 13245.008.docx Stormwater Pollution Prevention Plan Stormwater Discharges From the Site Observed? I, N Problem/Corrective Action Location Turbidity Discoloration Sheen Location Turbidity Discoloration Sheen 35 13245.008.docx Storm water Pollution Prevention Plan Water Quality Monitoring Was any water quality monitoring conducted? ❑ Yes ❑ No If water quality monitoring was conducted, record results here: If water quality monitoring indicated turbidity 250 NTU or greater; or transparency 6 cm or less, was Ecology notified by phone within 24 hrs? ❑ Yes ❑ No If Ecology was notified, indicate the date, time, contact name and phone number below: Date: Time: Contact Name: Phone#: General Comments and Notes Include BMP repairs, maintenance, or installations made as a result of the inspection. Were Photos Taken? ❑ Yes ❑ No If photos taken, describe photos below: 36 13245.008.docx Stormwater Pollution Prevention Plan Appendix F — Engineering Calculations 37 13245.008.docx TECHNICAL INFORMATION REPORT Fred Meyer Fuel Center - #459 Renton Center 431 Rainier Avenue South Renton, Washington Prepared for: Pcol E. HAiip The Kroger Co. . ` ► s 3800 S.E. 22nd Avenue Portland, OR 97202 l / ,p�(42779. � 5fr \1. 4�V� ofzt 5 S°►Ion C• Revised May 20, 2013 October 19, 2012 Our Job No. 13245 GOA 4/ 4 S 4,14 CIVIL ENGINEERING, LAND PLANNING,SURVEYING 1:9` !' Z 18215 72ND AVENUE SOUTH KENT,WA 98032 (425)251-6222 (425)251-8782 FAx n `. '` ' u BRANCH OFFICES • OLYMPIA,WA • TACOMA,WA • CONCORD,CA • TEMECULA,CA s Y [ m www.barghausen.co � h' `r�tiG ENG 4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN A. Existing Site Hydrology The pre-developed condition for this site is the existing developed site because this area has been developed since before May 1979. The existing 1.13 acre project area is approximately 86 percent impervious. B. Developed Site Hydrology Under developed conditions, the site has 0.98 acres of impervious and 0.15 acres of landscape. The pollution generating surfaces of the site will be directed to a Filterra unit for water quality and then to the existing conveyance system through the Fred Meyer site. C. Performance Standards The Area-Specific Flow Control Standard required for this project site is determined to be Peak Rate Flow Control-Match Existing. The applicable conveyance system capacity standard was mentioned in the Conditions and Requirements Summary, which is to size the on-site conveyance system by the Rational Method utilizing an initial time of concentration of 6.3 minutes and a Manning's "n" value of 0.014 with the 100-year precipitation. The Area-Specific Water Quality Treatments Menu followed for this project was the Enhanced Basic Water Quality Menu, and the treatment selected is to use a 6'x13' Filterra Bioretention System. D. Flow Control System No Flow control is required for this project. Because this is a redevelopment project that will not increase the peak runoff rate of the 100-year storm event by more than 0,1 cfs, the facility requirement is waived. E. Water Quality System The Enhanced Basic Water Quality requirement will be achieved with a 7'x13' Filterra Bioretention System. Sizing calculations for the Filterra Unit are included. 13245.002.doc HYDROLOGY CALCULATIONS BASIN SUMMARY Peak Rate Flow Control Pre-Developed: 0.16 acres of landscape 0.97 acres of impervious surfaces Developed: 0.15 acres of landscape 0.98 acres of impervious surfaces Total = 1.13 Acres The KCRTS calculations are on the following pages. 15432.001.doc 67cfl Candi/1O1'J5 Flow Frequency Analysis Time Series File: 13245-pre.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- Flow Frequency Analysis Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob (CFS) (CFS) Period 0.250 6 2/09/01 2:00 0. 492 1 100.00 0.990 0.215 8 1/05/02 16:00 0.356 2 25.00 0.960 0.301 3 12/08/02 18:00 0.301 3 10.00 0.900 0.244 7 8/26/04 2:00 0.292 4 5.00 0.800 0.292 4 10/28/04 16:00 0.266 5 3.00 0.667 0.266 5 1/18/06 16:00 0.250 6 2.00 0.500 0.356 2 10/26/06 0:00 0.244 7 1.30 0.231 0.492 1 1/09/08 6:00 0.215 8 1.10 0.091 Computed Peaks 0. 447 50.00 0.980 ids cal.c A,reo-, 6141644!, (141,ruJ,61)s Arun 0.g7ae 1, t 3 Ac fie-Pew/ ped th hap s Flow Frequency Analysis Time Series File:13245-dev.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- Flow Frequency Analysis Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob (CFS) (CFS) Period 0.251 6 2/09/01 2:00 0.495 1 100.00 0.990 0.216 8 1/05/02 16:00 0.359 2 25.00 0.960 0.303 3 12/08/02 18:00 0.303 3 10.00 0. 900 0.247 7 8/26/04 2:00 0.294 4 5.00 0.800 0.294 4 10/28/04 16:00 0.268 5 3.00 0.667 0.268 5 1/18/06 16:00 0.251 6 2.00 0.500 0.359 2 10/26/06 0:00 0.247 7 1.30 0.231 0.495 1 1/09/08 6:00 0.216 8 1.10 0.091 Computed Peaks 0. 450 50.00 0.980 1,4465 cqe (1, o.r s /a(.,. (Wr v(Ps the - 0 4 9 8 Pc ____---____ 1. 13 Ac. WATER QUALITY CALCULATIONS 61 WWHM3 13245-wq File Edit View Help ❑ fa ® Z ! ao L 7,, lal '''''''''- 721131 MI6.- ' .LI :111111411 11:21 ' .1.114:1Schematic " Basin 1 Mitigated SCENARIOS itI �l 1 Subbasin NameiBasin 1 r Designate as Bypass for POC: I`Predeveloped 1 Surface Interflow Groundwater i - i I Flows To: 1Sand Filter 1 I 'Sand Filter 1 I MEM Area in Basin — Show Only Selected Run Scenario I i4,r: ` Available Pervious Available Impervious E A/B,Forest,Flat I 0 - ROADS/FLAT 0 1_ 1 7 AB,Forest,Mod '10 T ROADS/MOD I 0 V1 -7 IC715,f I I r A/B.Forest,Steep ' �0 ; ROADS/STEEP 10 I r AB,Pasture,Flat I .0 r ROOF TOPS/FLAT 0 AI,IBJ-"TIE r A/B,Pasture,Mod , ;D r DRIVEWAYS/FLAT 0 r A/B.Pasture,Steep I i0 Ir DRIVEWAYS/MOD I 0 -, r PJB,Lawn,Flat j LO � r DRIVEWAYS/STEEP � 0 r NB,Lawn,Mod j r SIDEWALKS/FLAT 1 0 r AIB,Lawn,Steep I i0 r- SIDEWALKS/MOD 10 . I I i r C,Forest,Flat 10 r SIDEWALKS/STEEP 10 I r C,Forest,Mod I 0 p PARKING/FLAT .88 l r C,Forest.Steep 10 r PARKING/MOD 0 r C,Pasture,Flat 10 I r PARKING/STEEP 10 Ir C,Pasture,Mod 10 r POND I I0� I r C,Pasture,Steep 10 p C,Lawn,Flat I -Move Elements - jr C,Lawn,Steep I 10 'Lr PerviousTotal 10.06 Aries Impervious Total i0.G8 1 Acres 41* ---t' Basin Total 0.74 (Acres SavetyI Loadvl 4 i i _ I X h0 I Y 142 1 Deselect Zero I Salem_t Rv-I GO 1 i IMIL WWI-M13 13245-wq 1—ft.!: 1 t QV] ''''i:-46).:;'.— I I 7.1 ...,..ilikk,,_. tii. 11, .... Schematic b_ •Sand Filter 1 l.Iiti.cated SCENARIOS 'Facility Name Sand Filter 1 f Predeveloped _ Outlet 1 Outlet 2 Outlet 3 l'aDownstream Connections ;0 0 10 Si;Mitigated Facility Type ;Sand Filter ! i Precipitation Applied to Facility Quick Filter Run Scenario i Evaporation Applied to Facility FI FMFNTS Facility Bottom Elevation (ft) 10 4? [tlijE6'- `' . Facility Dimensions r^+- Outlet Structure Bottom Length 13 Wild ^�tt Riser Height(ft) 7,O.T — ,1.P.I I Bottom Width g i HI- ( Effective Depth 1075 Riser Diameter(nJ 100 tom•' ; �/l� fj�P Left Side Slope p i Riser Type Flat =, "' nill `�I- Bottom Side Slope 0 Notch Type Right Side Slope r0 J Top Side Slope 0 Infiltration ;YES — Orifice Diameter Height QMex HydrauficConductivity(in/hr) jZ482 H Number (In) (Ft) (cfs) 1 1-5—H �:, 0 Filter material depth(ft) 11.8 —1 2 0 -J ra---: 0 Total Volume Filtrated(acre-ft) 82.915 3 10 H 115—H 0 Total Volume Through Riser(acre-ft) 8.118 Total Volume(acre ft) 91.033 Filter Storage Volume at Riser Head .001 MoveElements----- Pond Increment )0.10 Percent Filtered 91.08 't�I Show Pond Table !Open Table I SavexyJ Loadxyl 4i I ►I X )0 1 Y 130 1 � Itorra Bioretention Systems Steps to Sizing A Filterra® Bioretention System 1. Use the Filterra Design Assistance (DAKit) 2. Follow Filterra Guidelines on page 7 and 8 in DAKit 3. Open and run WWHM - In the "Site Information" window, select the appropriate county from the pull down menu in the upper left corner and then click on the project location on the map. Next, click the "General Project Information" button and build your drainage basin (usually<1 acre of impervious) with the "Mitigated" Scenario check box selected. Enter all pervious and impervious areas that direct runoff into the basin. 4. Connect your"basin"to the Sand Filter Element (Filterra) 5. Connect both interflow to the Filterra element. 6. Build Filterra using the Sand Filter module and enter the WWHM imputs as described on the following page. 7, Right click Sand Filter module to ensure the Filterra becomes the POC, Point of Compliance. 8. Ensure both OUTLET 1 and OUTLET 2 check boxes are selected when the POC screen appears. 9. Click on the "Run Scenario" button and verify that the Percent Filtered is equal or greater then DOE's 91% threshold for treated runoff(% of stormwater filtered through the Filterra). 10. Click the "Analysis" button and select the "Water Quality"tab. 11. Select the "701 IN flow to POC 1 Mitigated" dataset and click the "Run Analysis" button. Send your Project Information Form, grading plan, drainage divides, profiles and cover sheet to design@filterra.com. www.filterra.com Bioretention Systems Table 2: WWI-IM Sizing for Enhanced Treatment- Dissolved Metals Western Washington Region ONLY- vOla Available Filterra°Box Sizes Approximate Contributing (feet) Drainage Area (acres) 4x4 0.140 4x6or6x4 0.210 4x8or8x4 0.275 6 x 6 0.310 6x8or8x6 0.415 6x10or10x6 0.520 6x12or12x6 0.630 Notes: 1. Sizing table intended for planning level use.The design engineer must use the latest version WWHM to calculate the appropriately sized facility. 2. Sizing table meets WA DOE 2005 Stormwater Manual's 91%annual stormwater volume filtered. 3. Sizing table based on WWHM3 parking/flat and the SeaTac rain gauge with a precipitation factor of 1.0. Other precipitation factors,geographic locations and site conditions will affect Filterra sizing. 4. Sand Filter(Filterra)parameters: Filter material depth= 1.8 feet • Effective ponding depth=0.75 feet • Zero slope(s)on the filter box • Riser height=0.7 feet • Riser diameter= 100 inches • Filter Hydraulic Conductivity=24.82 inches per hour 5. All boxes are a standard 3.5 feet depth(INV to TC). 6. A standard SDR-35 PVC pipe coupling Is cast into the wall for easy connection to discharge drain. 7. Dimensions shown are Internal.Please add 1'to each external(using 6"walls). 8. Valid for Enhanced Treatment regiments(Dissolved Zinc and Copper). 9. For sizing In other areas of Washington State please contact Filterra. 13 www.filterra.com 12/8/10 Dan Lamotte Barghausen Consulting Engineers, Inc. 121, 300 Deschutes Way,#215 Tumwater, WA 98501 fi [terra May 29, 2013 A t,nming Idea in Str nnn ter filtration. Plan Review of Filterra® Fred Myer Fuel #13245, Renton, WA Dear Sirs Thank you for submitting the revised plans on 05-29-13 for our review of the Fred Myer Fuel #13245 project. Filterra®structure 11 (13x7 w/Internal bypass was studied for; • Planned Filterra® box size • Filterra® contributing drainage area meeting project's regional sizing specification • Filterra® invert elevations are higher than effluent invert elevations • The bypass is lower than the Filterra® elevation (spot elevations) • The grading pattern encourages cross linear flow and not head-on flow • The Filterra®outlet drain pipe is sized correctly and exits perpendicular to the wall • For any conflicting structures such as storm drain pipes below Filterra® • For most efficient placement of Filterra®unit The plan review concluded that the Filterra®structure listed above is sited and sized appropriately to treat stormwater to our published specifications. Operational consistency with these specifications is contingent upon the stormwater unit being installed correctly and according to the plans, as well as regular maintenance being performed. Installation Help documents will be forwarded to the Buyer at time of order. The Filterra®Installation, Operation and Maintenance Manual will be made available upon request. Yours sincerely I G,94::,-7- Duane ," Duane Vincent Engineer Support Filterra®Bioretention Systems Manufactured by Americast T: (804)798-6068 A M E R I CAST 11352 Virginia Precast Road F: (804)798-8400 not just concrete.concrete solutions, Ashland,VA 23005 E: design@filterra.com www.filterra.com 6" 1 7._O" LI . I- (M) -I INLET SHAPING I (BY OTHERS) I t I ,,,..0 I TOP SUB MI 10,050 LBS A A BOX AND TOP MUST BE t LIFTED SEPARATELY ` - t 4111111110, til 100 15 BASE UNIT WITH MEDIA 37,200 LBS L --1-, CURB -r-- f(BY OTHERS) SDR-35 PVC COUPLING CAST INTO PRECAST BOX WALL PLAN VIEW (OUTLET PIPE LOCATION VARIES) PLANT AS SUPPLIED CLEANOUT BY AMERICAST COVER (NOT SHOWN TREE FRAME & GRATE CAST IN FOR CLARITY) GALVANIZED CAST IN TOP SLAB TOP SLAB ANGLE NOSING TOP SLAB CURB AND GUTTER INTERLOCKING JOINT (TYP) Co (BY OTHERS) I ■I- STREET s I-co +t N I g -n-1i-_1==rte it=i1=a=ii=i DOWEL BARS 1=11=U-11-it II-It-11=!1= 1 i=n==u=u= n=11=111=11=1 a 12" O.C. a 1=11=11=11=11 11-11 =1I= It=4=11-11- 11=11=11-11,1 1=I I=11=111T =11-11=11=11= _ �sr: .:.:.:.;.:; FILTER MEDIA PROVIDED I �_ i:iv*=i iJ�c.J�N BY AMERICAST RilabPERFORATED MULCH PROVIDED BY AMERICAST tto UNOERORAIN SYSTEM UNDERDRAIN STONE PROVIDED BY AMERICAST BY AMERICAST SECTION A-A MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED BY WRITTEN AUTHORIZATION FROM FILTERRA DRAWING AVAILABLE IN TIF FILE FORMAT. 0 DATE: 04-16-2008 DWG: 13'x7' AwovilgAsy. 13'.(r x 71.0" PRECAST FILTERRAUNIT fiLrg NARROW WIDTH CONFIGURATION Copyright i 1001 by 1m.rica>I USAND 6.569,321¢ 6- 7'-0" 6~ rr-> �� r n TOP SUB • 10,125 LBS I 40 BOX AND TOP MUST BE LIFTED SEPARATELY I i *0 I � i =. 411111111111101 1 1 i ELAN VIEW BASE MTH MEDIA SDR-35 PVC COUPLING ' ' 37,200 LBS CAST INTO PRECAST BOX , WALL BY AMERICAST (OUTLET PIPE > 1i LOCATION VARIES) I ==-_ 1-1- p_. LI~—D CURB (BY OTHERS) a INLET SHAPING (BY OTHERS) TREE FRAME PLANT AS SUPPLIED CLEANOUT COVER & GRATE BY AMERICAST GALVANIZED CAST IN TOP SLAB CAST IN (NOT SHOWN ANGLE NOSING TOP SLAB TOP SLAB FOR CLARITY) CURB AND GUTTER INTERLOCKING Co (BY OTHERS) JOINT (TYP) I 1 STREET _. I25 • so I !O i, i��f?ice}BSc-�;ii>>i?�S>.:�;�-;_:. ��•�n, ‘i�i ._`i�p�i�i^i��� <r> � Cy I o •in II=IF 11 inrruf1=11 Illlil1=11 I=I[ rIunn1irrITgnii1r,nnurt .11=11.`, DOWEL BARS I M •:_-n a n-n=g u n=n=u II :�-n=n n n=u I n--li=u a u-u_",. 0 12" O.C. ;, ? .• 5 i-u. ii—u-u-n.-.n=u-a-n= -n--u-n-n-IligffL—Irn- n1 u n=.i=n=u n n u-u !� a Ir-n-n=u-n u u u u u Is u= . I i s-u-u-u II. a III II Il u-1i=II—II u l u n u_II II—I. ., •i\lf+ Maif�+t!' SECTION A-A I c MULCH PROVIDED BY AMERICAST 2 PERFORATED UNDERDRAIN SYSTEM UNDERDRAIN STONE PROVIDED BY AMERICAST BY AMERICAST FILTER MEDIA PROVIDED BY AMERICAST MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED BY WRITTEN AUTHORIZATION FROM FILTERRA DRAWING AVAILABLE IN TIF FILE FORMAT. DATE: 01-06-09 DWG: 7'x13 0 UdNicI,"D0^5 u. STAN ARD FILTERRA® UNIT t1ll,terra1 NARROW LENGTH CONFIGURATION US PAT 6,277,274 If- Copyright 2067 by Anoxic-AANARROW6,569,321 CROWNED FLUME FLUME - SLOPED PRECAST FILTERRA TOWARDS FILTERRA THROAT TOP SLAB (TYP) PRECAST FILTERRA FILTERRA THROAT TOP SLAB CURB 2.1;s; := ZI 1„c4v"a'. OPENING (TYP) ;vt 4-6" FILTERRA 14:-.1.t.-46.f..<4 ':94,114.01' . THROAT OPENING 4-6" OPENING /.` '.?� ,= •`: , 4-6" OPENING �" s / i:.:.j: r; .f: ': ':/:� .i .. '. i a ,� CAST—IN--PLACE i s FLUME & GUTTER Pi :,: t (SLOPED TOWARD PRECAST i.!‘ y • %.„y DOWEL FILTERRA THROAT) FILTERRA -•.^t CAST—IN—PLACE •1' (TYP) 'i �� �, r• w. DOWEL BOX WALL FLUME & GUTTER PRECAST , (TYP) (CROWNED AND SLOPED FILTERRA r: TOWARD FILTERRA THROATS) BOX WALL SECTIONS VIEWS OF FILTERRA IN TYPICAL FLUME APPLICATIONS SEE BELOW FOR DETAILS NOT SHOWN STANDARD 90' NOSING (OTHER NOSING AVAILABLE UPON REQUEST) \\` • I' ':•••!'•'.:..••; • PRECAST .°': :•• ' '-: TOP SLAB . 4.' ; ...4 :7/•; ' ; • : • . . 4-6" CLEAR •. .°i• ,d d• A• . •• ' THROAT •••• ; •••.: .ti . .y• ••• ' e OPENING \ o • • • • ea d e•' ° e4 Q G 4° , e•• . • .° �. d .a . a GI CAST—IN—PLACE a' ' ' ' . ,4- DEPRESSED GUTTER ° a . ` a 40, AND THROAT OPENINGe° e 4 , (BY CONTRACTOR) • . • .: :I r ' THROAT PROTECTION DEVICE F .I I. .. DO NOT REMOVE — LEAVE #4 DOWEL BARS ® 12" O.C. BY AMERICAST I•'. IN PLACE UNTIL SITE IS TO BE BENT AS NECESSARY BY CONTRACTOR ''.` '1 I4_• •• .' I�• STABILIZED AND FILTERRA PRIOR TO INSTALLATION OF FIELD POURED GUTTER I I•.`''; IS ACTIVATED PRECAST BOX WALL IMPORTANT FILTERRA FLOWLINE MUST _ BE AT A HIGHER ELEVATION SECTION VIEW THAN BYPASS FLOWLINE STANDARD FILTERRA THROAT OPENING (DROP INLET OR OTHER) MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED BY WRITTEN AUTHORIZATION FROM FILTERRA DRAWING AVAILABLE IN TIFF FILE FORMAT. DATE: 02-26-09 DWG: CGT-5 .,-_-°ALIl dOlkS DI�Q�U® FILTERRA® THROAT OPENING ��_ ��a0 o. AND GUTTER OR FLUME DETAIL Copyright©20Q7 by Anicricast US PAT 6,277,274 AND 6,569,321 4" SDR-35 GASKETED COUPLING CAST INTO PRECAST WALL LOT OR STREET (LOCATION VARIES) PARKINGa 4" PVC OUTLET PIPE (BY OTHERS) FACE OF CURB U CONNECT TO APPROPRIATE ifl GRASS OUTFALL (LOCATION VARIES) -48" THROAT -- ^� t ♦. ♦ • "• • 1.• • •r M • c .S ♦r. ♦ OtO\I'{1, -"Td t • ''.� .71 ',. • 00 • •t''• `/' :j t.00 •b•• • •' ••' L ".. ,.rs . 1r, MANHOLE ACCESS COVER** L.— CO —J SIDEWALK MODIFIED FILTERRA TOP SLAB CENTER OF 3X3 TREE GRATE I 60" I BOX SIZE DIM. "A" TREE GRATE MANHOLE 4 9'-0" 3'x3' YES MODIFIED NARROW LENGTH 6x8 9'-0" 4'x4'* YES FILTERRA UNIT 6x10 11'-0" (1) 4'x4' YES 6x12 13'-0" (1) 4'x4' YES *3'x3' TREE GRATE IS OPTIONALPLEASE NOTE ONLY FOR 4x8 (SHOWN) **THE MANHOLE COVER IS REQUIRED ON SOME MODIFIED 6x8 AND 6x10 BOXES MODIFICATION TOP SLABS FOR ACCESS DURING MAINTENANCE VISITS ON PROJECT INFORMATION 6" SDR-35 GASKETED COUPLING CAST INTO FORM PRECAST WALL PARKING LOT OR STREET 6" PVC OUTLET (LOCATION VARIES) PIPE (BY OTHERS) CENTER OF 4X4 FACE OF CURB cc CONNECT TO APPROPRIATE OUTFALL TREE GRATE U GRASS (LOCATION VARIES) /O 144" THROAT -_- NM I •r:• io °fO%uQO 070,05.4 1, > Q0 : : {: M o 70 �o � ", a :;;:: •:::::;:::::: :: : ia •i• 4..!•° 1. i l3.•. I O oa (p�00�� �V DaDa(7{{`DOO�� I 1'.�•� • •• • i a�• tpp e •• ', •t ds, ' ' 4R 6voO©Q�13�.Dn4 „,,e QIl �On4 I ••'4. Q. •••:•, •.• yam• '••••* ,• ♦ • '� `• ... • t :, • + .- : ,e`+ .., 0 1 .156"..•• •4., � •1C••i ;• \ e� SIDEWALK BOX SIZE DIM. "A" DIM. "B" TREE GRATE Bx4 5'-0" 9'-O" 3'x3' STANDARD NARROW WIDTH 8x6 7'-0" 9'-0" 4'x4' FILTERRA UNIT 10x6 7'-O" 11'-O" 4'x4'* SUITABLE FOR ALL 12x6 7'-0" 13'-0" 4'x4'* STANDARD BOXES MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED BY WRITTEN AUTHORIZATION *3'x3' TREE GRATE IS OPTIONAL FROM FILTERRA DATE: 12-09-09 DWG: WWA FTSC-4 0 TYPICAL FILTERRAO .- . triVP/P 9, A&Ks- wiloAsiy. SIDEWALK CONFIGURATIONS f, K. t \y ,of- - WESTERN WASHINGTON US PAT 6,277,274 Copyright®20(17 by Amencasl TOLL FREE(866)349-3458 AND 6,569,321 8.0 CSWPPP ANALYSIS AND DESIGN This project will utilize appropriate erosion and sediment control measures in order to protect the site and adjacent properties. 1. Clearing Limits — The clearing limits are shown on the Demolition and TESC Plan, part of the site development drawings. 2. Cover Measures—Cover measures are added in the TESC notes on the engineering plans. 3. Perimeter Protection—Perimeter protection is shown on the engineering plans (silt fencing). 4. Traffic Area Stabilization —A stabilized construction entrance is shown on the engineering plans. 5. Sediment Retention—Catch basin filters will be used for sediment retention. 6. Surface Water Collection —Onsite surface water will be routed through an onsite BMP prior to being discharged from the site. 7. Dewatering Control — Dewatering may be necessary during onsite excavation. Only clean water may leave the site. Dewatering may be accomplished through the use of sump pumps. 8. Dust Control—Dust control by sprinklering will be utilized if needed. 9. Flow Control—Flow control is not required for this project. Because this site is more than 1 acre, a General Permit from the Department of Ecology is required. 13245.002.doc