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• <br /> In general, discharge rates of stormwater from the site will be controlled where increases in <br /> impervious area or soil compaction during construction could lead to downstream erosion, or <br /> where necessary to meet local agency stormwater discharge requirements. <br /> 3.1.4 Element#4—Install Sediment Controls <br /> All stormwater runoff from disturbed areas shall pass through an appropriate sediment removal <br /> BMP before leaving the construction site. The specific BMPs to be used for controlling <br /> sediment on this project include: <br /> BMP C220: Storm Drain Inlet Protection <br /> BMP C233: Silt Fence <br /> BMP C150: Materials on Hand <br /> BMP C241: Temporary Sediment Pond <br /> All catchbasins, existing and proposed, are recommended to have storm drain inlet <br /> protection. In addition, any existing or proposed storm drain within 300 feet of <br /> excavation shall have storm drain inlet protection. <br /> Sediment will be removed from paved areas in and adjacent to construction work areas manually <br /> or using mechanical sweepers, as needed, to minimize tracking of sediments on vehicle tires <br /> away from the site and to minimize washoff of sediments from adjacent streets in runoff. <br /> 3.1.5 Element#5—Stabilize Soils <br /> Exposed and unworked soils shall be stabilized with the application of effective BMPs to prevent <br /> erosion throughout the life of the project. The specific BMPs for soil stabilization that shall be <br /> used on this project include: <br /> BMP C120: Temporary and Permanent Seeding <br /> BMP C121: Mulching <br /> BMP C123: Plastic Covering <br /> BMP C140: Dust Control <br /> BMP C150: Materials on Hand <br /> The project site is located west of the Cascade Mountain Crest. As such, no soils shall remain <br /> exposed and unworked for more than 7 days during the dry season (May 1 to September 30) and <br /> 2 days during the wet season (October 1 to April 30). Regardless of the time of year, all soils <br /> shall be stabilized at the end of the shift before a holiday or weekend if needed based on weather <br /> forecasts. <br /> In general, cut and fill slopes will be stabilized as soon as possible and soil stockpiles will be <br /> temporarily covered with plastic sheeting. All stockpiled soils shall be stabilized from erosion, <br /> protected with sediment trapping measures, and where possible, be located away from storm <br /> drain inlets, waterways, and drainage channels. <br /> UNDERWOOD GARTLAND JOHNSON 63,LLC April 2017 <br /> Stormwater Pollution Prevention Plan Page 5 <br />