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• <br /> KUKHOTSKIY DUPLEX <br /> flow control does not apply. Refer to the Calculations below and the following pages for <br />• basin description and associated flow control exemption calculations. <br /> Property Area =21,100 sf. (0.484 Ac.) <br /> On-Site Clearing Limits = 13,739 sf. (0.315 Ac.) <br /> Existing Site <br /> Impervious area: <br />• Existing Shed(TBR) = 149 sf. <br /> Existing Concrete Driveway(TBR) = 968 sf. <br /> Existing Gravel Shoulder(TBR) = 271 sf. <br /> Total = 1,388 sf. (0.032 Ac.) <br />• Pervious area: <br /> Existing Lawn Areas = 19,712 sf. (0.453 Ac.) <br /> Proposed Site <br /> On-site Impervious area: <br />• *Proposed Duplex Roof = 3,695 sf.Proposed Driveway&Walk = 1,472 sf. <br /> Total = 5,167 sf. (0.119 Ac.) <br /> *Note: —457 SF of new roof runoff to drain to infiltration trench. Net <br /> effective hardscape totals 4,838 SF. <br />• <br /> Off-site Impervious area: <br /> Proposed Driveway = 158 sf. <br /> New/Replaced Impervious Surface= 5,295 sf. (0.122 Ac.) <br />• New/Replaced Effective Impervious Surface=4,838 sf. (0.111 Ac.) <br /> Pervious area: <br /> Existing Lawn Areas = 7,361 sf. (0.169 Ac.) <br /> Proposed Amended Lawn = 8,414 sf. (0.194 Ac.) <br />• <br />• <br />• <br />• WESTERN ENGINEERS,INC. 18 PROJECT:19-1825-A <br />