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MINNEHAHA CREEK <br />QUALITY OF WATER <br />WATERSHED DISTRICT <br />QUALITY OF LIFE <br />Stormwater Management: <br />The District's Stormwater Management rule is triggered for any project proposing to create new or <br />replace existing impervious surface. Because the project proposes to increase impervious surface by .77 <br />acres (33,541 square feet) the District's Stormwater Management rule is triggered. The project proposes <br />greater than 40% disturbance for the entire site's redevelopment. As a redevelopment project <br />disturbing more than 40% of the site, and increasing impervious surface less than 50%, the site will be <br />required to treat the entire site's impervious surface runoff for phosphorus, rate, and volume control. <br />Please submit the following information to fulfill the criteria of the rule: <br />1. Additional details for the filtration trenches including: <br />a. Plan details which show the relationship between the trenches and the proposed <br />driveways for the homes <br />b. Confirmation that the trench in the back of Lot 3, Block 1, will remain <br />c. Routing of drain the needed for the filtration trenches <br />i. Grading or side profile of the slopes required for the trenches to drain <br />d. Provide drawdown calculations for the trenches <br />e, The northern segment of road (without proposed trenches on either side of the road) <br />appears to drain to the pond instead of the trenches; therefore may not receive <br />filtration/ infiltration treatment. <br />2. Both the north and south ponds will need to provide a low point directed to the EOF so that any <br />emergency flows will travel to the EOF/turf reinforced mat <br />As we review your submittals, we may find the need to request additional information, and will so <br />inform you. Please be advised that MCWD will retain the application and supporting materials <br />submitted for one year from the date of this letter. After that, the application will be closed and a new <br />application and supporting materials will need to be submitted to initiate the MCWD permit -review <br />process. If you have any questions please contact me at chompson@minnehahacreek.or� or 952-641- <br />4521. <br />Sincerely, <br />Cole Thompson // <br />Permitting Technician <br />We collaborate with public and private partners to protect and improve land and water for current and future generations. <br />15320 Minnetonka Boulevard, Minnetonka, MN 55345 (952) 471-0590 •Fax: (952) 471-0682 • www.minnehahacreek.org <br />