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Bundy SWPPP 2-4-22 lxÄÅ VÉÅÅxÜv|tÄ cÜÉ}xvà lxÄÅ VÉÅÅxÜv|tÄ cÜÉ}xvà lxÄÅ VÉÅÅxÜv|tÄ cÜÉ}xvà lxÄÅ VÉÅÅxÜv|tÄ cÜÉ}xvà Construction Stormwater Pollution Prevention Plan February, 2022 Turner Consulting Services, LLC 4405 7th Ave. SE, Suite 301 Lacey, WA 98503 (360) 491-6900 Yelm, Washington February : PO Box 926 Rochester, WA 98579 360-280-2929 Prepared by: Turner Consulting Engineers, LLC, 4405-7th Avenue SE, Suite 301 Lacey, WA 98503 (360) 491-6900 Contact: Bill Turner, P.E. (360) 491-6900 “I hereby state that this Construction SWPPP for has been prepared by me or under my supervision which is usual and customary in this community for professional engineers. I understand that Thurston County does not and will not assume liability for the sufficiency, suitability, or performance of drainage facilities designed by Turner Consulting Engineers, LLC.” Table of Contents Construction Stormwater Pollution Prevention Plan 1.0 INTRODUCTION ……………………………………………………….. 1 2.0 SITE DESCRIPTION …………………………………………………… 3 Existing Conditions …………………………………………………. 3 Proposed Construction Activities …………………………………… 3 3.0 CONSTRUCTION STORMWATER BMPs …………………………… 4 Element 1 – Preserve Vegetation/Mark Clearing Limits …………… 4 Element 2 – Establish Construction Access ………………………... 4 Element 3 – Control flow Rates ……………………………………. 5 Element 4 – Install Sediment Controls ……………………………… 6 Element 5 – Stabilize Soils …………………………………………. 7 Element 6 – Protect Slopes …………………………………………. 9 Element 7 – Protect Drain Inlets ……………………………………. 10 Element 8 - Stabilize Channels and Outlets ………………………… 10 Element 9 – Control Pollutants ……………………………………... 11 Element 10 – Control De-Watering ………………………………… 13 Element 11 – Maintain BMPs ……………………………………… 14 Element 12 – Manage The Project …………………………………. 14 Element 13 – Protect Low Impact Development BMP’s…………… 17 4.0 CONSTRUCTION PHASING AND BMP IMPLEMENTATION …… 18 5.0 POLLUTION PREVENTION TEAM ………………………………… . 19 Roles and Responsibilities ………………………………………….. 19 Team Members ……………………………………………………... 19 6.0 SITE INSPECTIONS AND MONITORING ………………………….. 20 Site Inspection ……………………………………………………… 20 Site Inspection Frequency ………………………………………….. 21 Site Inspection Documentation …………………………………….. 21 Stormwater Quality Monitoring ……………………………………. 21 pH Sampling ……………………………………………………….. 22 7.0 REPORTING AND REDORDKEEPING ……………………………... 23 Site Log Book ………………………………………………………. 23 Records Retention …………………………………………………. . 23 Access to Plans and records ………………………………………… 23 Updating the SWPPP ……………………………………………….. 23 Reporting …………………………………………………………… 24 Appendices SITE PLAN CONSTRUCTION BMPs ALTERNATIVE BMPs SITE INSPECTION FORMS ____________________________________________________________Stormwater Pollution and Prevention Plan 1 MINIMUM REQUIREMENT #2 – Construction Stormwater Pollution Prevention Plan(SWPPP) 1.0 Introduction 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 record keeping 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. The SWPP was prepared using the Ecology SWPPP Template down loaded from the Ecology website on December 5, 2012. This SWPPP was prepared based on the requirements set forth in the Construction Stormwater General Permit, Stormwater management manual for Western Washington (SWMMWW 2019). The report is divided into thirteen elements with several appendices that include stormwater related references materials. The topics presented in the each of the main sections are: • Section 1 – INTRODCUTION. This section provides a summary description of the project, and the organization of the SEPPP 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 condition and post-conditions. • Section 3 – CONSTRUCTION BMPs. This section provides a detailed description of the BMPs to be implemented based on the 12 required elements of the SWPPP (SWMMWW 2005). • Section 4 – CONSTRUCTION PHASING AND BMP IMPLEMENTATION. This section proved a description of the timing of the BMP implementation in relation to the project schedule. ____________________________________________________________Stormwater Pollution and Prevention Plan 2 • 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 the 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 ____________________________________________________________Stormwater Pollution and Prevention Plan 3 2.0 Site Description 2.1 Existing Conditions This 0.99-acre parcel is located in the City Limits of Yelm on the corner of Burnett Street and State Route 510. The project site is flat with a with elevation difference from east to west of about 4-foot. Access into the site will be from Burnett Street. Vegetation on the site is mostly prairie grass and scotch broom. The City of Yelm has a water main next to the state highwa y and Burnett Street which will provide fire flow to the project site. There is no off site flow coming onto the project site. Stormwater that falls onto the site at this time infiltrates into the ground and does not flow off of the parcel. There are no steep slopes, ravens, creeks, or rivers on or adjacent to the site. This project does not have high ground water and it is not in the 100-year flood plain. Thurston County Geodata does have it listed in the aquifer sensitive area. 2.2 Proposed Construction Activities Construction on the project will include private roads, grading of new pads for the structures, parking areas, paving, utility, and stormwater improvements. • Total site area: 0.99 Acres • Estimated Driveway Surface: 0.425 Acres • Estimated Roof Area: 0.125 Acres • Percent impervious area before construction: 0.00 % • Percent impervious area after construction: 55.65 % • Disturbed area after construction: 0.99 Acres 3.0 Construction Stormwater BMPs 3.1 The 12 BMP Elements Element 1:Preserve Vegetation/Mark Clearing Limits • Prior to beginning land disturbing activities, including clearing and grading, all clearing limits, sensitive areas and their buffers, and trees that are to be preserved within the construction area should be clearly marked, both in the field and on the plans, to prevent damage and offsite impacts. • Plastic, metal, or stake wire fence may be used to mark the clearing limits. • The duff layer, native topsoil, and natural vegetation shall be retained in an undisturbed state to the maximum extent practicable. If it is not practicable to retain the ____________________________________________________________Stormwater Pollution and Prevention Plan 4 duff layer in place, stockpile it onsite cover it to prevent erosion, and replace it immediately upon completion of the ground disturbing activities. Because this parcel is within the City Limits of Yelm the clearing limits for this project are marked by the existing property lines, neighbors fences and survey markers. • The Contractor shall clearly identify all clearing and grubbing limits with plastic flagging or metal fence posts. • The Contractor shall clearly fence all tree protection areas as identified by the construction drawing, certified by Thurston County. • Suggested BMPs BMP C101: Preserving Natural Vegetation BMP C102: Buffer Zones. BMP C103: High Visibility Plastic or Metal Fence BMP C104: Stake and Wire Fence Element 2: Establish Construction Access • Construction vehicle access and exit shall be limited to one route if possible, or two for linear projects such as roadways where more than one access is necessary for large equipment maneuvering. • Access points shall be stabilized with a pad of quarry spall or crushed rock, or equivalent BMP prior to traffic leaving the construction site to minimize the tracking of sediment onto public roads. • Wheel wash or tire baths should be located onsite, if the stabilized construction entrance is not effective in preventing sediment from being tracked on public roads. • If sediment is tracked off site, public roads shall be cleaned thoroughly at the end of each day, or more frequently during wet weather, if necessary to prevent sediment from entering waters of the state. Sediment shall be removed from roads by shoveling or pickup sweeping and shall be transported to a controlled sediment disposal area. Street washing will be allowed only after sediment is removed in this manner. • Street wash wastewater shall be controlled by pumping back on site to an approved infiltration facility, or otherwise must be prevented from discharging into systems tributary to state surface waters. Other options include discharge to the sanitary sewer, or discharge to an approved offsite treatment system. For discharges to the sanitary sewer, permits must be obtained from the local jurisdiction providing the sewer. Construction of the structures take place in different phases beginning with the infrastructure, and stormwater facilities. The construction entrance onto the parcel shall be from Burnett Street which is a City Street and is on the east side of the property. • The Contractor shall establish the construction entrance as shown on the Erosion Control Site Plan and Detail Sheets before work begins on the project site. ____________________________________________________________Stormwater Pollution and Prevention Plan 5 • If sediment is tracked onto SR 12, the Contractor shall take immediate and appropriate steps to remove sediments and keep roadway clean. • Suggested BMPs BMP C105: Stabilized Construction Entrance BMP C106: Wheel Wash BMP C107: Construction Road/Parking Area Stabilization Element 3: Control Flow Rates • Properties and waterways downstream from development sites shall be protected from erosion due to increases in the volume, velocity, and peak flow rate of stormwater runoff from the project site, as required by local plan approval authority. • Downstream analysis is necessary if changes in flows could impair or alter conveyance systems, streambanks, bed sediment or aquatic habitat. See Volume 1, Chapter 3 for offsite analysis requirements guidlines. • Where necessary to comply with Minimum Requirement #7, stormwater retention/detention facilities shall be constructed as one of the first steps in grading. Detention facilities shall be functional prior to construction of site improvements (e.g. impervious surfaces). • The local permitting agency may require pond designs that provide additional or different stormwater flow control if necessary to address local conditions or to protect properties and waterways downstream from erosion due to increases in the volume, velocity, and peak flow rate of stormwater runoff from the project site. • If permanent infiltration ponds are used for flow control during construction, these facilities shall be protected from siltation during the construction phase and plans made for restoration after construction. This project will be over the 5,000 square foot threshold for requiring a downstream analysis. This site will be protected from erosion through standard BMP’s such as silt fencing, slope protection, ect.. There will be no increase in the volume, velocity and peak flow rate of stormwater coming from the project site. This project will require rain gardens and/or bioretention facilities to be constructed during the initial grading phase of construction. It shall be noted on the plans that the excavation for the rain gardens and/or bioretention basins to final grade will be completed before construction of structures begin. Initial basin excavation should be conducted to within 1-foot of the final elevation of the basin floor. Any accumulation of silt in the infiltration facility must be removed before putting it in service. ____________________________________________________________Stormwater Pollution and Prevention Plan 6 • The Contractor shall construct one row of erosion control silt fencing as shown on the plans or as directed by the Engineer to filter sediments from stormwater if runoff should leave construction site. • Suggested BMPs BMP C233: Silt Fence BMP C234: Vegetated Strip BMP C240 Sediment Trap Element 4: Install Sediment Controls • Prior to leaving a construction site, or prior to discharge to an infiltration facility, stormwater runoff from disturbed areas shall pass through a sediment pond or other appropriate sediment removal BMP. Runoff from fully stabilized areas may be discharged without a sediment removal BMP, but must meet the flow control performance standard of Element #3, bullet #1. Full stabilization means concrete or asphalt paving; quarry spalls used as ditch lining; or the use of rolled erosion products, a bonded fiber matrix product, or vegetative cover in a manner that will fully prevent soil erosion. The local permitting authority should inspect and approve areas stabilized by means other than pavement or quarry spalls. • Sediment ponds, vegetated buffer strips, sediment barriers or filters, dikes, and other BMPs intended to trap sediment onsite shall be constructed as one of the first steps in grading. These BMPs shall be functional before other land disturbing activities take place. • Earthen structures such as dams, dikes, and diversions shall be seeded and mulched according to the timing indicated in Element #5. • The Contractor shall not disturb any vegetation in the tree protection areas and outside of the clearing limits in order to preserve the natural landscaping within and adjacent to the project site. The Contractor shall construct one row of erosion control silt fencing as shown on the plans or as directed by the Engineer to filter sediments from stormwater if runoff should leave construction site. • Sediment will be removed from paved areas in and adjacent to construction work areas manually or using mechanical sweepers, as needed, to minimize tracking of sediments on vehicle tires away from the site and to minimize washoff of sediments from adjacent streets in runoff. • Suggested BMPs BMP C233: Silt Fence BMP C234: Vegetated Strip BMP C240: Temporary Sediment Pond ____________________________________________________________Stormwater Pollution and Prevention Plan 7 Element 5: Stabilize Soils • All exposed and unworked soils shall be stabilized by application of effective BMPs that protect the soil from the erosive forces of raindrop impact, flowing water, and wind. • From October 1 through April 30, no soils shall remain exposed and unworked for more than 2 days. From May 1 to September 30, no soils shall remain exposed and unworked for more than 7 days. This condition applies to all onsite soils, whether at final grade or not. These time limits may be adjusted by the County if it can be shown that the average time between storm events justifies a different standard. • Soils shall be stabilized at the end of the shift before a holiday or weekend if the weather forecast calls for precipitation. • Applicable practices include, but are not limited to, compost addition, temporary and permanent seeding, sodding, mulching, plastic covering, soil application of polyacrylamide (PAM), early application of gravel base on areas to be paved, and dust control. • Soil stabilization measures selected should be appropriate for the time of year, site conditions, estimated duration of use, and potential water quality impacts that stabilization agents may have on downstream waters or ground water. • Soil stockpiles must be stabilized from erosion, protected with sediment-trapping measures, and located away from storm drains, waterways, or drainage channels. • Linear construction activities, including right-of-way and easement clearing, roadway development, pipelines, and trenching for utilities, shall be conducted to meet the soil stabilization requirement. Contractors shall install the bedding materials, roadbeds, structures, pipelines, or utilities and re-stabilize the disturbed soils so that: o From October 1 through April 30 no soils shall remain exposed and unworked for more than 2 days, and o From May 1 to September 30, no soils shall remain exposed and unworked for more than 7 days. • The Contractor shall stabilize all exposed and unworked soils by application of effective BMPs such as track walking, Hydroseeding, cover with plastic or mulch to protect the soil from the erosive forces. From October 1 through April 30, no soils shall remain exposed and unworked for more than 2 days. From May 1 to September 30, no soils shall remain exposed and unworked for more than 7 days. This condition applies to all soils on site, whether at final grade or not. • Soils shall be stabilized at the end of the shift before a holiday or weekend if needed based on the weather forecast. Applicable practices include, but are not limited to, temporary and permanent seeding, sodding, mulching, plastic covering, erosion ____________________________________________________________Stormwater Pollution and Prevention Plan 8 control fabrics and matting, soil application of polyacrylamide (PAM), the early application of gravel base on areas to be paved, and dust control. • Linear construction activities, including right-of-way and easement clearing, roadway development, pipelines, and trenching for utilities, shall be conducted to meet the soil stabilization requirement. Contractors shall install the bedding materials, roadbeds, structures, pipelines, or utilities and re-stabilize the disturbed soils so that: - from October 1 through April 30 no soils shall remain exposed and unworked for more than 2 days and - from May 1 to September 30, no soils shall remain exposed and unworked for more than 7 days. • Suggested BMPs BMP C120: Temporary and Permanent Seeding BMP C121: Mulching BMP C122: Nets and Blankets BMP C123: Plastic Covering BMP C124: Sodding BMP C125: Topsoiling BMP C126: Polyacrylamide for Soil Erosion Protection BMP C130: Surface Roughening BMP C131: Gradient Terraces BMP C140: Dust Control BMP C180: Small Project Construction Stormwater Pollution Prevention Element 6: Protect Slopes • Design and construct cut and fill slopes shall be designed and constructed in a manner that will minimize erosion. • Consider soil type and its potential for erosion. • Reduce slope runoff velocities by reducing the continuous length of slope with terracing and diversions, reduce slope steepness, and roughen slope surface. • Offsite stormwater (run-on) shall be diverted away from slopes and disturbed areas with interceptor dikes and swales. Offsite stormwater should be managed separately from stormwater generated on the site. • At the top of slopes, collect drainage in pipe slope drains or protected channels to prevent erosion. • Temporary pipe slope drains shall handle the peak flow from a 10-year, 24-hour event assuming a Type 1A rainfall distribution. Alternatively, the 10-year and 25-year, 1 hour ____________________________________________________________Stormwater Pollution and Prevention Plan 9 flow rates indicated by an approved continuous runoff model, increased by a factor of 1.6, may be used. If a 15-minute (or less) time step is used, no correction factor is required. The hydrologic analysis shall use the existing land cover condition for predicting flow rates from tributary areas outside the project limits. For tributary areas on the project site, the analysis shall use the temporary or permanent project land cover condition, whichever will produce the highest flow rates. • Permanent pipe slope drains shall be sized for the 100-year, 24-hour event. • Provide drainage to remove ground water intersecting the slope surface of exposed soil areas. • Excavated material shall be placed on the uphill side of trenches, consistent with safety and space considerations. • Check dams shall be placed at regular intervals within channels that are cut down a slope. • Stabilize soils on slopes, as specified in Element #5. Excavation of slopes is not likely on this project. If the contractor should required excavation of any slopes then it shall be completed as follows. • The Contractor shall construct cut and fill slopes in a manner that will minimize erosion and reduce slope runoff velocities. Tracking walking exposed slopes and/or laying matting or mulch to protect soils will be required for all slopes great than 10 to 1. • Suggested BMPs BMP C120: Temporary and Permanent Seeding BMP C130: Surface Roughening BMP C200: Interceptor Dike and Swale BMP C201: Grass-Lined Channels BMP C204: Pipe Slope Drains BMP C205: Subsurface Drains BMP C206: Level Spreader BMP C207: Check Dams BMP C208: Triangular Silt Dike (Geotextile-Encased Check Dam). Element 7: Protect Drain Inlets • All storm drain inlets made operable during construction shall be protected so that stormwater runoff does not enter the conveyance system without first being filtered or treated to remove sediment. ____________________________________________________________Stormwater Pollution and Prevention Plan 10 • All approach roads shall be kept clean, and all sediment and street wash water shall not be allowed to enter storm drains without prior and adequate treatment, unless treatment is provided before the storm drain discharges to waters of the State. • Inspect inlets weekly at a minimum and daily during storm events. Clean inlet protection devices, or remove and replace when sediment has filled one-third of the available storage (unless a different standard is specified by the product manufacturer). There are no drainage inlets within the project area to project. If there were the Contractor shall do the following: • The Contractor shall protect all storm drain inlets made operable during construction with the filter apparatus shown on the erosion control detail sheet. All inlets shall be inspected weekly at a minimum and daily during storm events or as directed by the Engineer. Inlet protection devices should be cleaned or removed and replaced when sediment has filled one-third of the available storage (unless a different standard is specified by the product manufacturer). There are no storm drain inlets near the site that could potentially receive surface runoff from the construction site. • Suggested BMPs BMP C220: Storm Drain Inlet Protection Element 8: Stabilize Channels and Outlets • All temporary onsite conveyance channels shall be designed, constructed and stabilized to prevent erosion from the peak 10-minute flow velocity from a Type 1A 10- year 24-hour frequency storm for the developed condition. Alternatively, the 10-year, 1- hour time step flow rate indicated by an approved continuous runoff model, increased by a factor of 1.6, may be used. If a 15-minute (or less) time step is used, no correction factor is required. The hydrologic analysis shall use the existing land cover condition for predicting flow rates from tributary areas outside the project limits. For tributary areas on the project site, the analysis shall use the temporary or permanent project land cover condition, whichever will produce the highest flow rates. • Stabilization, including armoring material, adequate to prevent erosion of outlets, adjacent streambanks, slopes and downstream reaches shall be provided at the outlets of all conveyance systems. There are no channels or outlets on or adjacent to the project site therefore stormwater from this project will be allowed to sheet flow across the ground and infiltrate or be directed toward the wetland buffer or the south undeveloped area. • The Contractor shall direct the stormwater to areas where it can be cleaned or infiltrated into the ground through sheet flowing across the natural ground or into wetland buffer. ____________________________________________________________Stormwater Pollution and Prevention Plan 11 • Suggested BMPs BMP C202: Channel Lining BMP C209: Outlet Protection 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. Woody debris may be chipped, ground or chopped and spread on site. • Cover, containment, and protection from vandalism shall be provided for all chemicals, liquid products, petroleum products, and non-inert wastes present on the site (see Chapter 173-304 WAC for the definition of inert waste). Onsite fueling tanks shall include secondary containment. • Maintenance and repair of heavy equipment and vehicles involving oil changes, hydraulic system drain down, solvent and de-greasing cleaning operations, fuel tank drain down and removal, and other activities which may result in discharge or spillage of pollutants to the ground or into stormwater runoff must be conducted using spill prevention measures, such as drip pans. Contaminated surfaces shall be cleaned immediately following any discharge or spill incident. Report all spills to 911. Emergency repairs may be performed onsite using temporary plastic placed beneath and, if raining, over the vehicle. • Wheel wash, or tire bath wastewater, shall be discharged to a separate onsite treatment system or to the sanitary sewer if allowed by the local wastewater authority. • 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’ label recommendations shall be followed for application rates and procedures. • BMPs shall be used to prevent or treat contamination of stormwater runoff by pH modifying sources. These acidic or basic sources include, but are not limited to, bulk cement, cement kiln dust, fly ash, new concrete washing and curing waters, waste streams generated from concrete grinding and sawing, exposed aggregate processes, and concrete pumping and mixer washout waters. Stormwater discharges shall not cause or contribute to a violation of the water quality standard for pH in the receiving water. • Construction sites shall adjust the pH of stormwater if necessary to prevent violations of water quality standards. Projects must obtain written approval from the Department of Ecology prior to using chemical treatment other than CO2 or dry ice to adjust pH. • The Contractor shall ensure all pollutants, including waste materials and demolition debris, which occur onsite shall be handled and disposed of in a manner that does not cause contamination of stormwater. Woody debris may be chopped and spread on site. ____________________________________________________________Stormwater Pollution and Prevention Plan 12 • All chemicals, liquid products, petroleum products, and non-inert wastes present on the site (see Chapter 173-304 WAC for the definition of inert waste), shall be covered, contained, and protected from vandalism. On-site fueling tanks shall include secondary containment. • Maintenance and repair of heavy equipment and vehicles involving oil changes, hydraulic s ystem drain down, solvent and de-greasing cleaning operations, fuel tank drain down and removal, and other activities which may result in discharge or spillage of pollutants to the ground or into stormwater runoff must be conducted using spill prevention measures, such as drip pans. Contaminated surfaces shall be cleaned immediately following any discharge or spill incident. Emergency repairs may be performed on-site using temporary plastic placed beneath and, if raining, over the vehicle. • Wheel wash or tire bath wastewater shall be discharged to a separate on-site treatment system or to the sanitary sewer. • 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 rates and procedures shall be followed. • BMPs shall be used to prevent or treat contamination of stormwater runoff by pH modifying sources. These sources include, but are not limited to, bulk cement, cement kiln dust, fly ash, new concrete washing and curing waters, waste streams generated from concrete grinding and sawing, exposed aggregate processes, and concrete pumping and mixer washout waters. Stormwater discharges shall not cause or contribute to a violation of the water quality standard for pH in the receiving water. • Construction sites with significant concrete work shall adjust the pH of stormwater if necessary to prevent violations of water quality standards. • Suggested BMPs BMP C151: Concrete Handling BMP C152: Sawcutting and Surfacing Pollution Prevention See Volume IV – Source Control BMPs Element 10: Control De-Watering • All foundation, vault, and trench de-watering water, which has similar characteristics to stormwater runoff at the site, shall be discharged into a controlled conveyance system, prior to discharge to a sediment trap or sediment pond. Channels must be stabilized, as specified in Element #8. ____________________________________________________________Stormwater Pollution and Prevention Plan 13 • Clean, non-turbid de-watering water, such as well-point ground water, can be discharged to systems tributary to state surface waters, as specified in Element #8, provided the de-watering flow does not cause erosion or flooding of the receiving waters. These clean waters should not be routed through sediment ponds with stormwater. • Highly turbid or otherwise contaminated dewatering water, such as from construction equipment operation, clamshell digging, concrete tremie pour, or work inside a cofferdam, shall be handled separately from stormwater at the site. • Other disposal options, depending on site constraints, may include: 1) infiltration, 2) transport offsite in vehicle, such as a vacuum flush truck, for legal disposal in a manner that does no pollute state waters, 3) Ecology-approved onsite treatment using chemical treatment or other suitable treatment technologies, or 4) sanitary sewer discharge with local sewer district approval, if there is no other option, 5) use of sedimentation bag with outfall to a ditch or swale for small volumes of localized dewatering. • If de-water should occur on this project from the foundation pour or concrete slabs, the Contractor shall either discharge into designated areas as directed by the Engineer or transport offsite to an approval disposal site. If discharged on-site the Contract shall construct the spreader trench in such a manner as to allow the water to sheet flow through the project site for infiltration. All de-watering shall be infiltrated on- site and not be directed to adjacent property. 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. All maintenance and repair shall be conducted in accordance with BMPs. • Sediment control BMPs shall be inspected weekly or after a runoff-producing storm event during the dry season and daily during the wet season. • All temporary erosion and sediment control BMPs shall be removed within 30 days after final site stabilization is achieved or after the temporary BMPs are no longer needed. Trapped sediment shall be removed or stabilized on site. Disturbed soil areas resulting from removal of BMPs or vegetation shall be permanently stabilized. • The Contractor shall ensure that all temporary and permanent erosion and sediment control BMPs are maintained and repaired in accordance with the BMP specification and as needed to assure they are in proper working order. All temporary erosion and sediment control BMPs shall be removed within 30 days after site stabilization is achieved or not longer needed. All trapped sediment shall be either stabilized on site or removed to an approved disposal site. ____________________________________________________________Stormwater Pollution and Prevention Plan 14 Element 12: Manage The Project • Phasing of Construction - Development projects shall be phased where feasible in order to prevent, to the maximum extent practicable, the transport of sediment from the project site during construction. Revegetation of exposed areas and maintenance of that vegetation shall be an integral part of the clearing activities for any phase. Clearing and grading activities for developments shall be permitted only if conducted pursuant to an approved site development plan (e.g., subdivision approval) that establishes permitted areas of clearing, grading, cutting, and filling. When establishing these permitted clearing and grading areas, consideration should be given to minimizing removal of existing trees and minimizing disturbance/compaction of native soils except as needed for building purposes. These permitted clearing and grading areas and any other areas required to preserve critical or sensitive areas, buffers, native growth protection easements, or tree retention areas as may be required by local jurisdictions, shall be delineated on the site plans and the development site. All plats shall include lot-specific grading plans, including information specified by the local permitting authority such as finished grades, finished floor elevations, buildable areas, and identified drainage outlets. This information would normally be submitted with the construction drawings, but may be required prior to preliminary plat approval. • Inspection and Monitoring – All BMPs shall be inspected, maintained, and repaired as needed to assure continued performance of their intended function. Site inspection shall be conducted by a person who is knowledgeable in the principles and practices of erosion and sediment control. The person must have the skills to 1) assess the site conditions and construction activities that could impact the quality of stormwater, and 2) assess the effectiveness of erosion and sediment control measures used to control the quality of stormwater discharges. Whenever inspection and/or monitoring reveals that the BMPs identified in the construction 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. The SWPPP shall be modified whenever there is a significant change in the design, construction, operation, or maintenance at the construction site that as, 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 ____________________________________________________________Stormwater Pollution and Prevention Plan 15 necessary to include additional or modified BMPs designed to correct problems identified. Revisions to the SWPPP shall be completed within seven (7) calendar days following the inspection. • Seasonal Work Limitations – In Olympia—except where approved chemical treatment, full dispersion or infiltration is practiced— clearing, grading, and other soil disturbing activities are prohibited in all watersheds between October 15 and April 1. Based on the information provided, and/or local weather conditions, the local permitting authority may expand or restrict the seasonal limitation on site disturbance. If, during the course of any construction activity or soil disturbance during the seasonal limitation period, silt-laden runoff leaving the construction site causes a violation of the surface water quality standard or if clearing and grading limits or erosion and sediment control measures shown in the approved plan are not maintained, the local permitting authority may take enforcement action, including but not limited to a notice of violation, administrative order, fine/penalty, stop-work order, or correction notice. The following activities are exempt from the seasonal clearing and grading limitations: 1. Routine maintenance and necessary repair of erosion and sediment control BMPs; 2. Routine maintenance of public facilities or existing utility structures that do not (a) expose the soil or (b) result in the removal of the soil’s vegetative cover; and 3. Self-contained project sites, where there is complete infiltration of the water quality design event runoff within the site. Local governments may restrict clearing and grading activities where site conditions may present a significant risk of impact to property or critical areas. Contact the local permitting authority for information on specific site restrictions. • Coordination with Utilities and Other Contractors - The primary project proponent shall evaluate, with input from utilities and other contractors, the stormwater management requirements for the entire project, including the utilities, when preparing the Construction SWPPP. • 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. The person shall have the skills to (1) assess site conditions and construction activities that could impact stormwater runoff quality, and (2) assess the effectiveness of erosion and sediment control measures used to control the quality of stormwater discharges. ____________________________________________________________Stormwater Pollution and Prevention Plan 16 A Certified Erosion and Sediment Control Specialist shall be identified in the Construction SWPPP and shall be onsite or on-call at all times. Certification may be obtained an approved training program that meets the erosion and sediment control training criteria established by Ecology. If a pre-construction meeting is held, this person shall attend. Sampling and analysis of the stormwater discharges from a construction site may be necessary on a case-by-case basis to ensure compliance with standards. Monitoring and reporting requirements may be established by the local permitting authority when necessary. The following discharge standard applies: • Runoff leaving the construction site shall be free of settleable solids, as measured with an Imhoff Cone and in accordance with Standard Methods for the Examination of Water and Wastewater, most recent edition, American Water Works Association. “Free of settleable solids” shall be defined as measuring less than 2.5 mL/L/hr, for storms up to the water quality design event . The following surface water standard applies: • For storms up to the water quality design event, turbidity downstream of a construction site may not increase more than 5 NTU, if upstream turbidity is 50 NTU or less, and may not increase more than 10 percent, if upstream turbidity is over 50 NTU. To the extent practicable, samples should be taken far enough downstream so that the construction site discharge has been well-mixed with the surface water. • Maintaining an Updated Construction SWPPP The SWPPP shall be retained onsite or within reasonable access to the site. The SWPPP shall be updated within 7 days to reflect any significant changes in the design, construction, operation, or maintenance at the construction site that have, or could have, a significant effect on the discharge of pollutants to waters of the state. The SWPPP shall be updated within 7 days if during inspections or investigations by site staff or local or state officials, it is determined that the SWPPP is ineffective in controlling pollutants such that applicable discharge or surface water standards violations are apparent. Element 13: Protect Low Impact Development BMP’s • Protect all Bioretention and Rain Garden BMPs from sedimentation through installation and maintenance of erosion and sediment control BMPs on portions of the site that drain into the Bioretention and/or Rain Garden BMPs. ____________________________________________________________Stormwater Pollution and Prevention Plan 17 • Restore Bioretention and Rain Garden BMPs to their fully functioning condition if they accumulate sediment during construction. Restoring the BMP includes removal of sediment and any sediment-laden Bioretention/Rain Garden soils, and replacing the removed soils with soils meeting the design specification. • Prevent compaction of Bioretention, Rain Garden, and other infiltration BMPs by excluding construction equipment and foot traffic. Protect completed lawn and landscaped areas from compaction due to construction equipment. • Protect surrounding land uses from erosion and manage to avoid introducing sediment onto permeable pavements. Do not allow muddy construction equipment on the base material or pavement. Do not allow sediment-lade runoff onto permeable pavements. • Clean pavements fouled with sediments or no longer passing an initial infiltration test using procedures acceptable to the County or in accordance with manufacturer’s procedures. • Keep heavy equipment off of existing soils under LID facilities (Bioretention, Rain Gardens, Infiltration Ponds, Permeable Pavements, etc.) that have been excavated to final grade to retain the infiltration rate of the soils. Suggested BMPs o BMP C102: Buffer Zone o BMP C103: High Visibility Fence o BMP C200: Interceptor Dike and Swale o BMP C201: Grass-Lined Channels o BMP C207: Check Dams o BMP C208: Triangular Silt Dike (TSD) (Geotextile-Encased Check Dam). o BMP C231: Brush Barrier o BMP C233: Silt Fence o BMP C234: Vegetated Strip o Additional Guidance: See Chapter 5: Precision Site Preparation and Construction in the LID Technical Guidance Manual for Puget Sound for more detail on protecting LID integrated management practices. Site specific BMPs are shown on the TEC Plan Sheets and Details in Appendix A. These site specific plan sheets will be updated annually. 4.0 Construction Phasing and BMP Implementation The BMP implementation schedule will be driven by the construction schedule. The following provides a sequential list of the proposed construction schedule milestones and the corresponding BMP implementation schedule. The list contains key milestones such as wet season construction. The BMP implementation schedule listed below is keyed to proposed phases of the construction project, and reflects differences in BMP installations and inspections that relate to wet season construction. The project site is located west of the Cascade ____________________________________________________________Stormwater Pollution and Prevention Plan 18 Mountain Crest. As such, the dry season is considered to be from May 1 to September 30 and the wet season is considered to be from October 1 to April 30. • Estimate of Construction start date: _______________________ • Estimate of construction finish date: ______________________ • Mobilize equipment on site: ______________________ • Mobilize and store all ESC and soil stabilization products: ______________________ • Install stabilized construction entrance: ______________________ • Begin clearing and grubbing: ______________________ 5.0 Pollution Prevention Team 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, ect,); 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 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 Lear. ____________________________________________________________Stormwater Pollution and Prevention Plan 19 Team Members Title Name(s) Phone Number Certified Erosion and Sediment Control Lead (CESCL) Resident Engineer Bill Turner 360-239-2847 Emergency Ecology Contact Report a Spill (360) 407-6300 Emergency Owner Contact Crystal Bundy (360) 280-2929 Non-Emergency Ecology Contact Monitoring Personnel Contractor 6.0 Site Inspections and Monitoring Site inspection and 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 sit 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. If log book and SWPPP is separated, the site log book must be maintained on-site or within reasonable access to the site and be made available upon request to Ecology or the local jurisdiction. Site Inspection All BMPs will be inspected, maintained and repaired as needed to assure continued performance of their intended function. Site inspections will be conducted by a person who is knowledgeable in the principles and practices or erosion and sediment control. The onsite inspector will have the skills to assess the potential for water quality impacts as a result of the type of construction activities occurring on site, and the knowledge of the appropriate and effective ESC measures needed to control the quality of stormwater discharges. All BMPs will be inspected, maintained and repaired as needed to assure continued performance of their intended function. The inspector will be a Certified Erosion and Sediment Control Lead (CESCL) per BMP C160. The name and contact information of the CESCL is provided in Section 5 of this SWPPP. ____________________________________________________________Stormwater Pollution and Prevention Plan 20 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. 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. Site Inspection Documentation The site inspector will record each site inspection using the site log inspection forms provided in the Appendix E. The site inspection log forms ma y be separated from the SWPPP document, but will be maintained on-site or within reasonable access to the site and be made available upon request to Ecology or the local jurisdiction. Stormwater Quality Monitoring Monitoring requirements for the proposed project will include turbidity sampling to monitor site discharges for water quality compliance with the Construction Stormwater General Permit (Appendix D). Sampling will be conducted at all site discharge points at least once per calendar week. A discharge point or outfall is any point along the perimeter of the project site where water leaves (during hours of construction). Refer to permit section S4.G for sampling procedures and guidance manual references. Turbidity monitoring will follow the analytical methodologies described in Section S$ of the Construction Stormwater General Permit (Appendix D). The key benchmark values that require action include 25 NTU and 250 NTU for turbidity. If the 25 NTU benchmark for turbidity is exceeded, the following steps will be conducted: 1. Ensure all BMPs specified in this SWPPP are installed and functioning as intended. 2. Assess whether additional BMPs should be implemented and make revisions to the SWPPP as necessary. ____________________________________________________________Stormwater Pollution and Prevention Plan 21 3. Sample the discharge location daily until the analysis results are less than the 25 NTU (turbidity) or 32 cm (transparency). If the turbidity is greater than 25 NTU but less than 250 NTU for more than 3 days, additional treatment BMPs will be implemented within 24 hours of the third consecutive sample that exceeded the benchmark value. Additional treatment BMPs will include, but are not limited to, off-site treatment, infiltration, filtration and chemical treatment. If the 250 NTU bench mark for turbidit y is exceeded at any time, the following steps will be conducted: 1. Notify Ecology by phone within 24 hours of analysis. 2. Continue daily sampling until the turbidity is less than 25 NTU. 3. Initiate additional treatment BMPs such as off-site treatment, infiltration, filtration and chemical treatment within 24 hours of the first 250 NTU exceedance. 4. Implement additional treatment BMPS as soon as possible, but within 7 days of the first 250 NTU exceedance. 5. Describe inspection results and remedial actions that are taken in the site log book and in monthly discharge monitoring reports. pH Sampling Stormwater runoff will be monitored for pH staring on the first day of any activity that includes more than 40 yards of poured or recycled concrete, or after the application of “Engineered Soils” such as, Portland cement treated base, cement kiln dust, or fly ash. This does not include fertilizers. For engineered soils, the pH monitoring period begins when engineered soils are first exposed to precipitation and continue until the area is fully stabilized. Stormwater samples will be collected daily from all points of discharge from the site and measured for pH using a calibrated pH meter, pH test kit, or wide range pH indicator paper. If the measured pH is 8.5 or greater, the following steps will be conducted: 1. Prevent the high pH water from entering storm drains or surface water. 2. Adjust or neutralize the high pH water if necessary using appropriate technology such as CO2 sparging (liquid or dry ice). 3. Contact Ecology if chemical treatment other than CO2 sparging is planned. ____________________________________________________________Stormwater Pollution and Prevention Plan 22 7.0 Reporting and Recordkeeping 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. Records Retention Records of all monitoring information (site log book, inspection reports/check lists, etc.), this Stormwater Pollution Prevention Plan, and nay 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. Access to Plans and Records The SWPPP, General Permit, Notice of Authorization letter, and Site Log Book will be retained on site or within reasonable access to the site and will be made immediately available upon request to Ecology or the local jurisdiction. A copy of the 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. Updating the SWPPP In accordance with Conditions S3, S4.B.3 of the General Permit, this SWPPP will be modified if the SWPPP is ineffective in eliminating or significantly minimizing pollutants in stormwater discharges from the site or there has been a change in design, construction, operation, or maintenance at the site that has a significant effect or the discharge, or potential for discharge, of pollutants to the waters of the State. The SWPPP will be modified within seven days of determination based on inspection(s) that additional or modified BMPs are necessary to correct problems identified, and an updated timeline for BMP implementation will be prepared. ____________________________________________________________Stormwater Pollution and Prevention Plan 23 Reporting Discharge Monitoring Reports 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 ot being conducted at the site. If cumulative soil disturbance is 5 acres or larger: Discharge Monitoring Reports (DMRs) will be submitted to Ecology monthly. If there was no discharge during a given monitoring period, the Permittee shall submit the form as required, with the words “No discharge” entered in the place of monitoring results. If a benchmark was exceeded, a brief summary of inspection results and remedial actions taken will be included. If sampling could not be performed during a monitoring period, a DMR will be submitted with an explanation of why sampling could not be performed. Notification of Noncompliance If any of the terms and conditions of the permit are not met, and it causes a threat to human health or the environment, the following steps will be taken in accordance with permit section S5.F: 1. Ecology will 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 (5) days, unless requested earlier by Ecology. Any time turbidity sampling indicates turbidity is 250 nephelometric turbidity units (NTU) or greater or water transparency is 6 centimeters or less, the Ecology regional office will be notified by phone within 24 hours of analysis as required by permit condition S5.A (see Section 5.0 of this SWPPP for contact information). In accordance with permit condition S4.F.6.b, the Ecology regional office will be notified if chemical treatment other than CO2 sparging is planned for adjustment of high pH water (see Section 5.0 of this SWPPP for contact information). Permit Application and Changes In accordance with permit condition S2.A, a complete application form will be submitted to Ecology and the appropriate local jurisdiction (if applicable) to be covered by the General Permit. ____________________________________________________________Stormwater Pollution and Prevention Plan Appendix A – Site Plan F9 � x FT -1 F- F -1 x -7 z F7 U-1�4 IP OP OP OP — —FM— — —FM- �17— -- W-- O -------------_ !i I J I O i -� o m I n T m V � � o N o 0 Q _. o 0 I\� O � � FT -1 c) x m r9 x x r+ =3 cn c� a� o D 70 70 0 D H � C IT1 H 1 70 CD 7U m N r 70F9(� F— r- ti z75 o 3 CD F9 73 z z o � O z D V) d � Cn I J I O i C� _ o m I n T m V � � o N o 0 Q _. o 0 I\� O � � Cf) n Q o 1 m n �l r+ =3 cn c� a� o O Q -0 O 0 � O 1G Q CD 7U m F— r- ti o 3 CD 73 � O � Cn I J I FF -]F7 i C� _ _17 IT I n T m o � � o N x 0 I\� O � � � n co m n O z c� z Z 7U m F— r- i UJ m �U C x 0 O - O -U n O � 7U -0 F- U cn m U m F71 U O D < n r� F- n z o F71 m D m a UT O F71 r7 X X Z7 FT -1 71 � F71 C/) Z F- (-) F - FF -1 Cn FF -]F7 00 C� _ _17 IT n T o � o N C'T� 0 I\� O C/2 ® FTI i UJ m �U C x 0 O - O -U n O � 7U -0 F- U cn m U m F71 U O D < n r� F- n z o F71 m D m a UT O F71 r7 X X Z7 FT -1 71 � F71 C/) Z F- (-) F - FF -1 L:1 as N 0 bid o Bmdy C(g=e ' zR CenterTP.Tm(!7,�'nn PnnfhrA GnsuR in 0 4405 7th Ave SIE Suite 301 Lacey, WA 98503 360-491-6900 9 04 i In Sltc I'1��1� j C�� OP OP — O I— — —FM— — —FM- -w ---W ---W CD 1 �® z • -3 trJ C/1 z o � x � 0 o Z t7 r 0O O is 0 �, y z xJ Z y O • c.D z m coo 0 0 x y -3 r Z y r > r -3Z a b �b a xo z a r y z 1 r z y a O y • O -3 c� > 3 H O REVISION BLOCK: DESIGN INFORMATION PROJECT IDENTIFICATION No. FILE NAME: General Site Plan C&C/ ACTION DESIGNED BT 8-11-22 DRAWN BT 8-11-22 CHECKED BT 8-11-22. PLOTTED DATES C C/2 ® °� L:1 as N 0 bid o Bmdy C(g=e ' zR CenterTP.Tm(!7,�'nn PnnfhrA GnsuR in 0 4405 7th Ave SIE Suite 301 Lacey, WA 98503 360-491-6900 9 04 i In Sltc I'1��1� j C�� OP OP — O I— — —FM— — —FM- -w ---W ---W CD 1 �® z • -3 trJ C/1 z o � x � 0 o Z t7 r 0O O is 0 �, y z xJ Z y O • c.D z m coo 0 0 x y -3 r Z y r > r -3Z a b �b a xo z a r y z 1 r z y a O y • O -3 c� > 3 H O REVISION BLOCK: DESIGN INFORMATION PROJECT IDENTIFICATION No. FILE NAME: General Site Plan C&C/ ACTION DESIGNED BT 8-11-22 DRAWN BT 8-11-22 CHECKED BT 8-11-22. 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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 Element #2 – Establish Construction Access Element #3 – Control Flow Rates Straw Bales Quarry Spalls or Light Loose Rip Rap Element #4 – Install Sediment Controls Straw Bales Early application of gravel base for roads to be paved Element #5 – Stabilize Soils Track Walking Jute Matting Straw Mulch Element #6 – Protect Slopes Track Walking Jute Matting Straw Mulch Element #7 – Protect Drain Inlets Straw Bales Element #8 – Stabilize Channels and Outlets Element #9 – Control Pollutants Element #10 – Control Dewatering ____________________________________________________________Stormwater Pollution and Prevention Plan Appendix D – General Permit If R equired ____________________________________________________________Stormwater Pollution and 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. It is mandatory that this SWPPP and the site inspection forms be kept on-site at all times during construction and that inspections be performed and documented as outlined below. At a minimum, each inspection reportor 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 reasons(s) why e. A description of stormwater discharged from the site. The presence of suspended sediment, turbid water, discoloration, and/or oil sheen shall be noted, as applicable. f. A description of any water quality monitoring performed during inspection, and the results of that monitoring. g. General comments and notes, including a brief description of any BMP repairs, maintenance or installations made as a result of the inspection. h. A statement that in the judgment of the person conducting the site inspection, the site is either in compliance or out of compliance with the terms and conditions of the SWPPP and the NPDES permit. If the site inspection indicates that the site is out of compliance, the inspection report shall include a summary of the remedial actions required to bring the site back into compliance, as well as a schedule of implementation. ____________________________________________________________Stormwater Pollution and Prevention Plan 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. ____________________________________________________________Stormwater Pollution and 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: