9506 7TH AVE SE 2018-01-02 MF Import

December 6, 1978 Rr. Tracy Gill 13123 48th Ave. N.P. marysville, t.7A -)8270 on O MR. Uu U�c o B 197E CM OF EVERETT I11SPV: 011 ppr- Subiectt Review of Drainage Plan Proposal for the L'verett Free Methodist Church, 9506 - 7th Ave. >.r. Dear Tracy, The review of your revised drainage plan proposal was conpleted December 5, 1978, and is being returned to you. The proposal covers 3-1/2 acres for an approximate predevelopment ru.h-off of 137 cubic, feet. A 20 minuto storm discharging at a rate of D.2 cubic feet per second requires a storage capacity of 3000 cubic feet. The plan review shorn a discharge of 0.25 cubic foot per second hilhich requires 3680 cubic feet of storage canacl.ty. Another matter that needs attention is that the area under development appears to oxceed 3-1/2 acres; therefore, the calculations must be corrected accordingly. Also, nu details of orifice wore provided and the pencilled corrections and additions to the Plans am unsatisfactory. In addition, the plane are required to show protection fr(a blockage by siltation (such as rock work) at t:n outlet pipe) also required is the nonding capacity and necessary details about the ck-tentionj the ,ontrol is to tx placed in the pond rather than in the narhinq area( and safety fencl:,q is required on pond slonos in excess of 3 to 1 ratio. 2`he proper procedure for resubnittal of tie revised plans is to deliver 4 sets of plans and calculations to th. Duilding Department which in located on Olympic Drive at Madison. Plans shall not be delivered directly to the Public Works Department. I have enclosed, for your convenience, an acceptable format for Submittal of the required drainage plan. Additionally, an illustration on the a�mrvpriate form has been Provided based on the 3-1/2 acre proposal rather than on tick larger area.