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DNR METRO REGION 6 TEL:612--772 7977 16:57 <br />STATf. Of <br />fr~ lf~ rn ~ c~ u £\ <br />DEPARTMENT OF NATURAL RESOURCES <br />, RO WATERS -1200 W.ARNER ROAD, ST. PAUL, MN" 551'06 <br />PHONE No. 772-7910 -----------·--.. . ~----~-----.., <br />November 5 1 1992 <br />David Carlson <br />2400 Mayflower Avenue <br />Minn~tonka, MN 55305 <br />R~: CARLSON CABIN, BIG ISLAND; LA'.KEMIN:NETON.KA (27-133!1, #5), <br />CITY OF ORONO, HENNEPIN COUNTY <br />D~ar Mr. Carlson: <br />This letter-0 is to confirm our discussion of September 28 1 1992, <br />concerning the construction of a cabin on Big Island in Lake <br />Minnetonka (27-133P). <br />The building site is within the flvudplain of Lake Minnetonka, i.e. <br />below ·the elevation of 931.5'. Therefore, the new cabin must be <br />dohstructed with the lowest floor at or above the regulatory flood <br />p.1~otection elevation (RFPE) , which is at least 9'.52. 5'. (Check with <br />the city of orono on the minimum ~levation; they may bl?c more <br />stringent than the minimum ~tate requirement.) <br />You indicated that fill would not be used to elevate the structure.. <br />Therefore, the cabin in.uat be seou:cely anchored by a foundation <br />designed by either a certified archit~ct or engin~er which allows <br />water to flow freely beneath the structure • . / <br />/ . <br />In addition to the points above, the foll 1ng DNR concerns should. <br />be noted: <br />1. The vegetation and topography should be retain~d in a natural <br />state in the 37.5 1 shore impact zone of Lake Minnetonka. <br />2. The ordinary high water {OH:W) level of 929.4 1 (NGV:D, 1929) for <br />Lake Minnetonka should be noted in future plans and plats. It <br />is not clear whether the shoreline indicated is at the OHW or <br />not. The 929.4 1 contour should also be shown since that is <br />the critical elevation for building setbacks, limits of DNR <br />authority, etc. <br />3. Appropriate ~rosion control measures should be tak~n during <br />the construction period.· The Mirmi::ascta construction site <br />Erosion ahd sediment Control Planning f!andbook (Board of Wat~r ' <br />& Soil Resourc~s and Association of Metropolitan Soil and <br />Water Conservation Districts) guidelines, or their equivalent, <br />should be followed,