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vlikv <br /> Technical WENCK <br /> Memo ASSOCIATES <br /> Responsive partner. <br /> Exceptional outcomes. <br /> To: Jack Distel, District Representative, Minnehaha Creek Watershed District <br /> From: Erik Megow, Wenck Associates, Inc. <br /> Date: January 5, 2017 <br /> Permit Name: 1020 Mooney Lake Drive, Orono <br /> Permit Number: 17-529 <br /> Listed below are the rules applicable to this redevelopment and our analysis of how the <br /> applicant has satisfied the requirements of each rule. <br /> Reviewed Exhibits <br /> • Water Resource Permit Application signed 10-13-17, received 10-17-17. <br /> • Soil Borings from Gronberg &Associates dated 11-24-17, received 11-24-17. <br /> • Plan Sheets from Gronberg & Associates dated 10-5-17, received 12-26-17. <br /> • Stormwater Management Report from Gronberg &Associates dated/printed 1-4-18, <br /> received 1-4-18. <br /> Stormwater Management Rule <br /> This portion on the Mooney Lake Preserve development will construct a new house of <br /> 14,625 sf of impervious surface and two treatment basins; a filtration and infiltration basin. <br /> The Project will disturb 1.61 acres of the 6.47-acre site. The project is considered part of a <br /> the Mooney Lake Preserve development and is required to provide phosphorus, rate, and <br /> volume control for the proposed impervious surface. <br /> Existing Proposed <br /> Size of Site (ac) Site Drains To Impervious Impervious <br /> (ac) (ac) <br /> 6.47 Mooney Lake 0.00 0.34 <br /> (1.61 ac disturbed) <br /> To meet the district requirements for volume control, the project needs to provide 1,218 cf <br /> of abstraction. To meet the requirements, the project will direct the runoff to a new <br /> infiltration basin and a new filtration basin. These basins are designed to provide a total of <br /> 1,557 sf of abstraction volume. The proposed basins provide volume and phosphorus control <br /> which meets the District's standards. <br /> Additionally, the basins are designed to provide rate control for the project. The following <br /> table shows the project's compliance with meeting the District's rate control requirements <br /> for the 1-, 10-, and 100-year storm events. <br /> Wenck Associates, Inc. I 1800 Pioneer Creek Center I P.O. Box 249 I Maple Plain, MN 55359-0249 <br /> Toll Free 800-472-2232` Main 763-479-4200 Email wenckmp@wenck.com Web wenck.com <br />