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Thomson Residence <br />Stormwater Site Plan Report <br />March 5, 2021 <br />Section I, Page 2 <br />was found to be infeasible for this project. A detention pipe with a flow control structure with an overflow <br />connection to the existing sewer main in the ROW of Thomson Ave will be constructed. <br />The proposed impervious areas were considered as follows: <br />Im pervious Areas <br />Roof: 21 (0.074 ac) <br />Impervious Decking/Concrete Stairs: 34 s 01 ac) <br />Concrete Driveway: 548 sf (0.013 ac) <br />Concrete Driveway (ROW): 271 sf (0.002 ac) <br />Total: 4,066 sf (0.093 ac) <br />The proposed pervious areas on -site were considered as follows: <br />Pervious Areas <br />Lawn: 2,747 sf (0.063 ac) <br />Total: 2,747 sf (0.063 ac) <br />In the following sections, this report will discuss the site assessment, stormwater management <br />techniques, erosion control, source controls, special studies, other permits, off -site conditions, hydrology, <br />flow control, water quality, and maintenance for the proposed project. <br />250 4th Avenue South, Suite 200 <br />Edmonds, WA 98020 <br />ENGINEERING ph.425.778.8500 1 f.425,778.5536 <br />www.cgengineering.com <br />