3800 RIVERFRONT BLVD 2021-01-28 - Laserfiche WebLink

I Stormwater Pollution Prevention Plan could lead to downstream erosion, or where necessaryto meet local agency stormwater discharge requirements (e.g. discharge to combined sewer systems). 1 3. .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(as required) for controlling sediment on this project include: ■ Silt Fence (BMP C233) I . Interceptor Dike and Swale (BMP C200) ■ Storm Drain Inlet Protection(BMP C220) ■ Portable Water Storage Tanks (e.g., Baker Tank) for Sedimentation. ■ Sediment Trap (BMP C240) 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. 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 I 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 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 throughout the life of the project. No soils shall remain exposed and unworked for more than 14 days during the dry 1 season (May 1 to September 30) and 7 days during the wet season(October 1 to April 30). Regardless of the time of year, all soils shall be stabilized at the end of the shift before a holiday or weekend if needed based on weather forecasts. 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. Soil amendments are required, per DOE BMP T5.13 for all disturbed areas of the site. I I6