2610 W CASINO RD VERIZON 2025-07-25

I Stormwater Management Report Everett, WA Design Criteria The City of Everett Stormwater Management Manual, January 1997 and 1992 DOE Stormwater Manual. Nature and Goals of Project: The proposed project includes the addition of 4,382 SF of new impervious surface to accommodate semi-truck movement activities. Due to the increase in new impervious area, the existing water quality pond volume is to be increased. II. Preliminary Conditions Summary The existing site generally flows toward the center of the disturbed area. The surface run- off is then collected by the conveyance system and routed to the existing water quality pond in the northwest corner of the site. The pond then discharges to the east and is conveyed to the City of Everett public storm drainage system at the northeast corner of the site. The public system continues east along West Casino Road. The proposed site improvements will consist of less than 5,000 SF of new impervious. The proposed project will increase the existing water quality pond and the existing conveyance system will remain. See Exhibit A for the Pre-Developed Conditions Map 111 See Exhibit B for the Post-Developed Conditions Map Ill. Off-Site Analysis The proposed development contains less than 5,000 SF of new impervious surface. Due to the minor scope of these improvements, no impact to the off-site storm drainage system is anticipated. Therefore, no off-site analysis was performed. IV. Analysis and Design of RequiredErosion and Sediment Control BMPs The proposed erosion control measures will include inlet protection for all existing catch basins near the project's disturbed area and approximately 685 LF of silt fence will be installed to minimize the risk of silt and sediment exiting the site during construction activities. See the attached Demolition and T.E.S.C. Plan, sheet D-1.0 (Exhibit F) for location of Inlet Protection and Silt Fence. I I PACLAND Job# 50183001 Page 3