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Horizon Elementary School —Classroom Portable Installation <br /> IN Construction SWPPP Narrative <br /> May 10, 2019 <br /> engineering p e <br /> Exposed slopes will be protected with DOE-approved coverage methods. BMPs <br /> including,but not limited to: C101,Preserving Natural Vegetation; C121, Mulching; <br /> C123,Plastic Covering; C130, Surface Roughening; C140, Dust Control; and T5.13 Post <br /> Construction Soil Amendment will be used to stabilize on-site soils during construction. <br /> 6) Protect Slopes: DOE-approved BMPs for slope protection will be utilized during <br /> construction. Concentrated discharges shall not be allowed to flow over the top of steep <br /> slopes. BMPs including, but not limited to C101,Preserving Natural Vegetation; C121, <br /> Mulching; C123, Plastic Covering; C130, Surface Roughening; C140,Dust Control; and <br /> C233, Silt Fence are to be utilized to protect slopes during construction. <br /> 7) Protect Drain Inlets: Drainage structures in areas where no work occurs will remain and <br /> will be protected; discharge points to the public storm drain main line will also be <br /> protected. To prevent discharge of turbid water downstream, all existing catch basins <br /> located within the disturbance area and outside of the disturbance area within <br /> approximately 300 feet downstream of the site will be protected with storm drain inlet <br /> protection(BMP C220). Proposed inlets will also be protected with catch basin inserts, <br /> and where feasible,their outlets will be temporarily plugged until the site is stabilized. <br /> The Contractor shall remove inlet protection at the end of the project without releasing <br /> captured sediment into the storm system. <br /> 8) Stabilize Channels and Outlets: Channels are not proposed as part of this project and <br /> BMPs for channel stabilization are not expected. If required, DOE-approved BMPs for <br /> channel stabilization include, but are not limited to: C200, Interceptor Dike and Swale; <br /> and C207, Check Dams. <br /> 9) Control Pollutants: Temporary protection of the disturbed soils provides the first level <br /> of protection for pollution control and perimeter measures downstream will mitigate the <br /> remaining pollutants. <br /> In addition, construction debris will be removed from the site. The Contractor will be <br /> responsible for managing their construction equipment per DOE-approved BMPs. If a <br /> truck wheel wash is required,truck wheel wash water and concrete truck washout water <br /> shall be collected and discharged to the public sanitary sewer(SS) system. To apply for <br /> SS release, contact the local sewer purveyor for authorization. <br /> Construction operations will also be managed in accordance with BMP C151, Concrete <br /> Handling; BMP C152, Sawcutting and Surface Pollution Prevention; BMP C153 Material <br /> Delivery and Storage; BMP C154, Concrete Washout Area. <br /> 10) Control De-Watering: The majority of the earthwork on the project will be constructed <br /> during the dry season,therefore it is not anticipated that groundwater will be encountered <br /> in the excavations for this project. In the event that perched groundwater is encountered <br /> during any wet season construction,the Contractor shall route it to the sediment settling <br /> facility by pumping it out of the excavation. <br /> 11) Maintain BMPs: DOE-approved standard BMP maintenance will be required in <br /> accordance with the City of Everett TESC Notes (see Sheet C3.0). Contractor shall keep <br /> materials on hand in accordance with BMP C150. <br /> Page 2 <br />