12011 19TH AVE SE PARKING LOT 2021-12-23

f STORMWATER SITE PLAN OCTOBER 23,2019 EMORYS ON SILVER LAKE PAGE 1 PROJECT OVERVIEW This Stormwater Site Plan has been prepared for the Emorys on Silver Lake valet parking lot project located at 12011 19th Avenue SE in Everett, Washington, see Figure 1: Vicinity Map. The site is at the northeast corner of the intersection of 19th Avenue SE and 120th Place SE.The 0.44 acre site currently contains a building, adjacent to 19th Ave SE, with a gravel parking area to the east, see Figure 2: Existing Site Map. The proposal is to regrade and pave the parking area and extend frontage improvements across the property. The existing building was recently damaged and will be removed. A detention vault will be constructed that will detain runoff from the redeveloped parking lot. The vault has been sized to accommodate a future building to be constructed in the west portion of the site, see Figure 3: Developed Conditions. Project Totals: New Paving &Walks 9,580 SF Future Building 2,700 SF Landscape 7,000 SF METHODOLOGY The drainage design for the project has been prepared based on the requirements of the 2014 DOE Manual as adopted by the City of Everett. The design is based on the following parameters: • The site is a redevelopment site having greater than 35%existing impervious. • The project will result in 5,000 sf of more of impervious surface. Therefore the project will need to meet Minimum Requirements 1-9 the new hard surfaces and converted pervious areas. WWHM2012, as provided by DOE, has been used for sizing of the proposed stormwater facilities for the site. P:\Work\Projects\2018\18-141 Emory's\CE\DOCS\Final SSP 18-141.doc