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MINNEHAHA CREEK WATERSHED DISTRICT <br /> QUALITY OF WATER QUALITY OF LIFE <br /> August 14th, 2018 <br /> Jeremy Barnhart <br /> City of Orono Community Development Director <br /> 2750 Kelley Parkway <br /> Orono, MN 55356 <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 />