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W <br />H <br />9�Cn <br />tH�H <br />M C] <br />y� <br />r/J H <br />H <br />x <br />H tv BOEING - EVERETT EMPLOYEES ACTIVITY CENTER <br />on <br />Q. PROPOSED REDESIGN OF STORM DRAINAGE SYSTEM <br />H H <br />yHy <br />r t y Parameters of storm drainage system that have been changed from the original design that was <br />g rn approved for construction include: <br />0Uy <br />Delete all underground detention and replace with surface ponding for storm detention. <br />1-3ca The proposed location for both ponds, the Japanese Gulch system and Edgewater system, <br />H o w will be in the Japanese Gulch Basin approximately where the previously proposed tennis <br />courts were located. <br />- Delete 0.19 acres of parking on east side of parking lot and replace with landscaping. <br />- Delete tennis courts, volleyball area, and sport court at west edge of project. Proposed <br />development for this area now includes surface detention ponds only. <br />- Delete all underdrainage of ballfields. Ballfield drainage will be controlled by collection <br />of surface runoff. <br />- Delete concrete walks behind all backstops and dugout areas of ballfields. <br />These new parameters yield the following revised areas. <br />I �� <br />Awl <br />Total Project Limits = 19.23 Acres <br />Japanese Gulch Basin: <br />Pre -developed Conditions: <br />Total Area = 10.58 Acres general slope = 8% <br />Pervious Area = 10.58 Acres - woods/forest <br />Impervious Area = 0.0 Acres <br />Post -developed Conditions: <br />Total Area = 10.58 Acres general slope = 2% <br />1- <br />Pervious Area = 10.54 Acres - lawn/landscaping <br />Impervious Area = 0.04 Acres <br />Edgewater Basin: <br />Pre -developed Conditions: <br />Total Area = 8.65 Acres general slope = 4% <br />Pervious Area = 8.65 Acres - woods/forest <br />Impervious Area = 0.0 Acres <br />Post -developed Conditions: <br />