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� � <br /> Kirk Brooks <br /> From: Jane Zimmerman <br /> Sent: Friday, May 01, 2015 8:16 AM <br /> To: Kirk Brooks <br /> Subject: 3215 Broadway parking lot <br /> Hi Kirk— <br /> This project will create less than 5,000 square feet of new impervious surface,when taking into account the area of the <br /> homes that used to exist on the site. Therefore, minimum drainage requirement#7 does not need to be met and formal <br /> flow control measures (e.g. detention) are not required. However, because the site will create more than 2,000 square <br /> feet of impervious area,the site is still subject to minimum drainage requirement#5. MR#5 states that on-site <br /> stormwater management BMPs must be provided to infiltrate, retain, and disperse stormwater on site to the maximum <br /> extent feasible without causing flooding or erosion impacts. <br /> There is more that can be done on this site. Runoff treatment is not required because the site is located within the <br /> combined sanitary+storm sewer area, but reduction of flow volumes and rates is still important. <br /> I would suggest that the parking lot be "crowned" so that half of the runoff flows to the north side of the parking lot, <br /> and half to the south. The two "blank"triangular areas at the ROW—that are created by the first two angle parking <br /> spaces—could then be turned into vegetated or rock-filled depressions, say one to two feet deep. Any overflows would <br /> occur to the alley. This solution would also allow the elimination of the 2'gravel transition strip in the drive aisle. <br /> Other solutions are possible, of course,at the engineer's discretion. <br /> Thank you, <br /> Jane <br /> Jane Zimmerman, Sr. Engineer <br /> City of Everett Public Works Department <br /> phone: 425-257-8885 fax: 425-257-8882 <br /> e-mail:�zimmerman(c�everettwa.qov <br /> ��'(A-1;�.� �Gt``�'��� �"'� �� <br /> 1 <br />