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MINNEHAHA (CREEK <br />QUALITY OF WATER <br />August 14th, 2018 <br />Jeremy Barnhart <br />City of Orono Community Development Director <br />2750 Kelley Parkway <br />Orono, MN 55356 <br />WATERSHED DISTRICT <br />QUALITY OF LIFE <br />RE: Baldur Park Sketch Plan- 4 lots Northwest of 1376 Baldur Park, Orono <br />Mr. Barnhart, <br />The Minnehaha Creek Watershed District (District) was requested to review a sketch plan for a possible <br />new platted lot on Baler Park. From a preliminary review, the proposed development of a new lot would <br />consolidate four existing parcels into one and would trigger the District's Erosion Control, Floodplain <br />Alteration, and Wetland Protection rules. The Stormwater Management rule would be applicable if <br />anything other than one single family home is proposed. <br />Floodplain Alteration <br />The District's Floodplain Alteration rule is applicable for any project that proposed land disturbance <br />below the 100 -year floodplain elevation. The 100 -year floodplain for Lake Minnetonka is 931.5' and the <br />Ordinary High Water Level (OHWL) is 929.4'. Existing conditions indicate that a large portion of the site <br />is below the 100 -year floodplain. Per the District's rule, and fill brought in below the 100 -year floodplain <br />will have to compensated for at a 1:1 ratio between 931.5' and 929.4' (ie, 10 cubic yards of fill require <br />10 cubic yards of compensatory storage. Compensatory storage must be created between the 100 -year <br />floodplain and the OHWL). <br />All low openings will need two feet of freeboard above the 100 -year floodplain elevation which would <br />be a minimum of 933.5'. Floodplain alteration that results in greater than 50 cubic yard of fill will be <br />required to submit an as -built survey upon project completion. <br />Wetland Protection <br />The District's Wetland Protection rule is applicable for any project that proposes an impact to a wetland <br />and the Buffer provisions of the rule are applicable to new single family homes that propose an increase <br />in impervious surface. Based on District's Function Assessment of Wetlands (FAW), there is a Preserve <br />Management Class wetland present on the southwestern portion of the peninsula. Per section 6(f) of <br />the rule, new principal residential structures are required to apply a 25' wetland buffer upgradient from <br />the edge of the delineated wetland. Per section 6(c), the buffer can be averaged down to 50% (12.5') <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 />