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Josh, <br /> Based on the review of the submitted information, including the proposed on the drainage map, <br /> submitted 11-30-2011 and the narrative submitted 12-5-11 and conversations with the District, <br /> the proposed work can occur without any further review from the District. The findings are as <br /> follows: <br /> The applicant is proposing to convert a net of approximately 700± S.F. of existing gravel area <br /> into bituminous parking lot.The District Engineer finds that this proposed change will: <br /> • Not significantly change the site layout or drainage discharge points; <br /> • Have negligible effect on storm water rates leaving the site (and the District Engineer <br /> finds compliance with Rule C.6 requirements). <br /> The proposed work would require a Rule C.5 Water Quality of Volume Control (hereafter <br /> Volume) requirement of 0.8-inches over the disturbed impervious area of 700± S.F. Using a 0.9 <br /> runoff coefficient, this translates to a Volume requirement of 42 C.F. The applicant is proposing <br /> to meet this volume requirement through the previously installed underground infiltration <br /> galleries (installed under permit 08-072). As-built surveys indicated that the installed galleries <br /> had 908 C.F. of volume. The Volume requirement of the previous work was 838 C.F. Thus, <br /> there is enough extra volume capacity to meet the proposed site changes and comply with Rule <br /> C.5 requirements. <br /> As stated previously, no further action is required by the District. <br /> If you have any questions,please give me a call. <br /> Kate MacDonald,P.E. <br /> Civil Engineer <br /> Office: 763.493.4522 I Direct: 763.493.6674 I Fax: 763.493.5572 <br /> 6901 E Fish Lake Rd. , Suite 140 • Maple Grove, MN • 55369 <br /> www.houstoneng.com <br />