920 SE EVERETT MALL WAY 2016-01-01 MF Import

� f_ CKGROUND The site of the proposed temporary Frontier Bank facilities is an 0. GO acre parcel abuttiny the south side of Everett Mall LYay approximately one-quarter mile east of 77th Avenue S.E. in the City of Everett, LYashington. (See Vicinity Map attached as Exhibit 'A'. ) It is covered entirely by a well compacted gravelly fill material, sloping gently in a southerly direction at roughly 2.5 - 30. The proposed development on the site will not significantly increase discharge of stormwater runoff along the south line--a conservative judgement would be an increase in the 'C' factor from a pre-development figure of 0. 6 or 0. 7 to abeut 0.85 following development. PROPOSAL The proposal to collect and disperse stormwater runoff following comple- tion of construction activities is to construct a 2' deep x 18" wide dispersal trench along the south property line. Runoff will be directed towards the south line by grading patterns and released into the dispersal trench by 7" � drainage (or weep) holes in the extruded concrete curbinq at 18" on centers. 'The top of the trench will be constructed 6" below finished grade and an emergency overflow will be provided alonq the south line to allow potential stormwater overflow to travel in sheet flow in its natural southerly direction. 7 ►! �