2201 100TH ST SW AD SYSTEMS 2022-03-07

AD SYSTEMS EXPANSION EVERETT, WA PROJECT OVERVIEW PROPOSED IMPROVEMENTS The project will consist of an approximate 21,000 SF expansion to the existing building with pavement replacement to accommodate minor regrading efforts and water line re-routing. Although existing curb will be replaced to accommodate regrading efforts, no significant changes to the existing curbing limits and locations are proposed for this project. No changes to the existing water quality or quantity facilities are proposed. DESIGN CRITERIA The City of Everett utilizes the 2014 Stormwater Management Manual for Western Washington (2012 manual amended in 2014) (SMMWW) drainage requirements. Jurisdictional Requirements The total land disturbing activity as a result of the expansion and associated site improvements is approximately 60,000+/- SF (including both the building expansion area and site re-developed/re-paved areas). The project proposes to convert a total of 4,972+/- SF existing landscaping to new hard surfaces consisting of pavement and roof areas. Because the site is previously developed, no existing vegetation areas are being disturbed as a result of the improvements. Therefore project does not propose to convert existing vegetation to landscaped areas or pasture. The total assessed value of the existing building and utilities is $2,855,100 (per the Snohomish County Accessors information). The total cost of the building expansion and associated interior improvements is estimated to be $1,212,550. The new site improvements are estimated to be approximately$144,995 (site costs do not include utilities being modified in place to accommodate grade changes). The proposed improvements are 48%of the existing building and utility accessed value Minimum requirement 1-5 are required to be followed based upon Volume 1, Section 2.4.2 of the SMMWW and discussions with the City during the pre-application meeting on 5/23/17. NOVEMBER 20, 2017 STORMWATER DRAINAGE SUMMARY PAGE 2