7125 EVERGREEN WAY 2018-01-02 MF Import

EROSION AND SEDIMENTATION CONTROL DESIGN There are several low spots proposed throughout the site which will serve as sediment traps during grading activities. The sediment traps will be connected by interceptor ditches for overflow purposes and will eventually discharge to the location of the propo�^d wetland treatment cell at the northeast comer of the site. This sediment trap will discharge into tlie existing ditch near Rainier Drive. The wetland treatment cell provides 1,127 cubic feet of storage. Sediment trap calculations indicate that 1,208 cubic feet of storage is reqv�red. The six low points and interceptor ditches throughout the site will accommodate the remaining 81.5 cubic feet. Each low point will be a minimum 1 foot deep.