10200 19TH AVE SE COSTCO FUEL STATION 2022-05-23

1.0. PROJECT OVERVIEW The proposed fuel facility expansion project is located within the south half of the northeast quarter of the northeast quarter of Section 19, Township 28 North, Range 5 East, lying between Interstate 5 to the west, 19th Avenue S.E. to the east and south of 102nd Street S.E., Parcel No. 28051900101000. See Figures 1 and 2 for the Vicinity Map and Assessor's Map respectively. The site is in Flood Zone X, in an area determined to be outside the 500-year floodplain. See Figure 3 for the FEMA Map. The project includes a 3,360-square-foot expansion of the existing fuel canopy(7,115 square feet total) into the vehicle queuing area, with the addition of four (4) new fuel dispensers. Additional improvements include associated grading within the fuel queuing area and a modification to the channelization island at the driveway along 19th Avenue S.E. to accommodate the larger turning radius of vehicles currently using this driveway. The project proposes to maintain the existing flow control and water quality treatment established in 2006 with the on-site parking lot improvements. In the existing condition, site drainage flows to the existing detention pond and stormfilter system per the treatment criteria of the 2012 Stormwater Management Manual for Western Washington (SWMMWW), as Amended in December 2014 (The 2014 SWMMWW). 6226.038-SSP.doc