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{ <br /> 11400 SE 8th Street P 425-453-9501 <br /> Suite 345 F 425-453-8208 l 'ILI ND <br /> Bellevue,WA 98004 WWW.PACLAND.COM <br /> Memorandum <br /> Conclusion <br /> The installation of two (2) proposed playground canopies complies with the approved <br /> stormwater site plan. As discussed above, both of the existing detention ponds were sized for <br /> impervious areas greater than what has been built to date. <br /> The following tables summarize the total impervious area that each pond was sized for, the <br /> number of impervious acres draining to each pond to date (including the proposed canopies, <br /> and the total number of impervious acres remaining for each pond. <br /> West Basin <br /> Contributing Design Impervious Impervious Acres Impervious Acres <br /> Basin Acres Constructed Remaining <br /> Western Lot 3C 2.84 2.42 0.42 <br /> Western Lot 3D + Lot 3E 14.92 8.94 5.98 <br /> 23rd Drive W. 1.05 1.05 0.00 <br /> Total 18.81 12.41 6.82 <br /> East Basin <br /> Design Impervious Impervious Acres Impervious Acres <br /> Contributing Basin Acres Constructed Remaining <br /> Eastern Lot 3C 2.56 2.56 0.00 <br /> Eastern Lot 3D 3.79 0.57 3.22 <br /> Total 6.35 3.13 3.22 <br /> The existing ponds, as designed, can detain an additional 10.04 acres of impervious area. <br /> Additionally, if it is found that the basin break is slightly off, there is adequate volume in either <br /> pond to accommodate additional runoff. <br />