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2.0 DESIGN DOCUMENTATION <br />Existing Conditions <br />The site is currently developed and consist of a parking lot and hardscape. The site is bound by <br />Evergreen Way to the east, 50th Street S.E. to the south, and the Claremont Village shopping mall <br />to the east. The area of interest is approximate 0.55 acres and is currently covered in approximately <br />97 percent impervious surfaces and approximately 3 percent of landscaping. <br />The existing topography of the site exhibits slopes ranging from 1 to 6 percent with the highest <br />elevations located to the east. Currently, it appears run-off sheet flows over the existing parking lot <br />and flows from east to west and is collected within the existing on -site stormwater infrastructure. <br />Proposed Conditions <br />The proposed project consists of the construction of a new QFC fueling facility with underground <br />storage tanks and a prefabricated kiosk store, including new landscaping and pavement surfaces. <br />The pedestrian path from the bus stop to the site will remain intact to allow passage. As part of this <br />project, the existing landscape islands and parking spots will be demolished and removed. <br />Other than catch basins, storm drain cleanouts and the associated piping, there will be no drainage <br />facilities constructed. The site will maintain the same general topographic grading characteristics <br />and will be primarily comprised of pavement (concrete and asphalt) and structures. The onsite <br />runoff will sheet flow to the west before being captured and conveyed to the existing combine sewer <br />and stormwater infrastructure. The fuel canopy slab will be hydraulicly isolated from the rest of the <br />runoff as its conveyed through concrete swales to the sanitary sewer infrastructure. <br />Pre -Developed and Developed Basin Maps <br />See attached Figures 2.1 and 2.2, for the pre -developed and developed land cover areas. <br />Summary of Existing and Proposed Surface Areas <br />The table below shows the numerical summary of surface area for both the existing and proposed <br />conditions. <br />Existing Land Cover <br />(Square Feet) <br />Proposed Land Cover <br />(Square Feet) <br />Impervious <br />22,923 <br />22,571 <br />Landscaping <br />817 <br />1,169 <br />Total <br />23,740 <br />23,740 <br />As shown by the table there is a decrease in total impervious area and an increase of pervious <br />surfaces, i.e. landscaping. <br />Erosion Control <br />See Figure 2.3, for determination of erosion control risks and proposed measures to control erosion <br />and sedimentation. <br />20996.002-SSP.doc <br />