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2010 6 093-93256.100 <br />slortnwater runoft from the site is expected to be minimal due to the anticipaled dates ot conslruclion <br />(dry season) and the relatively small size ot the site. <br />3.4 Element #4 - Install Sediment Controls <br />All stormwater runofl from dislurbed •dreas will pass Ihrough an appropriate sediment removal BMP before <br />leaving ihe constrvction site. The specific BMPs to be used tor conirolling sediment on ihis project <br />include <br />■ Straw Bale Barrier (BMP C230) <br />■ Siit Fence (BMP C233) <br />■ Materials on Hand (8MP CI50) may also 6e appticable <br />Silt (i.e , filter fabric) fence will be inslalled across the drainage ditches where they leave the construction <br />site and e�sewhere as necessary. Additionally, quantities of erosion prevenlion and sediment control <br />matenais, including plastic covering, straw bales tor mulching, and extra silt fence (and ihe necessary <br />mesh and stakes), will be stockpiled on site al all times to be used for emergency situations such as <br />unexpected heavy summer rains. <br />3.5 Element #5 - Stabilize Soils <br />Exposed soils will be stabllized as necessary with ihe applicalion o( BMPs to prevenl erosion. The <br />specific BMPs for soil stabilization thal will be used on this project include� <br />■ Temporary ard Permanent Seeding (BMP C120) <br />■ Nets and Blankets (BMP C122) <br />■ Plaslic Covermg (BMP CI23) <br />■ Surface Roughening (BMP C130) <br />■ Dust Control (BMP C140) <br />■ Matenals on Hand (BMP CI50) may also be applicable <br />The major area of disWrbed soil will be the cap itsel(, which will be wnstructed in 6fls. Olher features <br />requiring soil slabiGzation include soils slockpiled on site as necessary. <br />The projec� si�e is located wesl of the Cascade Mountain Cresl As such, no soils will remain exposed <br />and unstabilized lor morc lhan 7 days during the dry season (May 1 to September 30) or 2 days during <br />the wet season (October 1 to April 30). Regardless ot the time of year, aU soils will be stabiGzed al the <br />end of the shift be(ore a holiday or weekend if needed, based on weather forecasts. <br />Ail disturbed soils will be stabi6zed lor ihe wet season. If ihe cap has not been completed, the wp <br />surface will be track-walked to roughen il in accordance with BMP C730. The perimeler ditches will be <br />temporarily seeded if permanent seeding has not been established prior to the wet season. Temporary or <br />permanent seed wili be apptied early enough to achieve germination prior to the wet season. If <br />oi:�,o-+,�i �:�,oa�e+.uama <br />�" Golder <br />Associates <br />