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February 1, 2006 <br />Mr. Chuck Dillerud <br />City of Lake Elmo <br />3800 Laverne Avenue North <br />Lake Elmo, MN 55042 <br />Re: 8160 Hill Trail North, Lake Elmo <br />Dear Mr. Dillerud: <br />Thank you for submitting the request for a variance from the Ordinary High Water level setback from <br />Lake DeMontreville at 8160 Hill Trail North. The project appears to involve tearing down the <br />existing home and constructing a new home, driveway, and septic system. <br />Based on the information that was submitted, it appears that a Valley Branch Watershed District permit is <br />not required for the work. It appears that less than 6,000 square feet of new impervious surfaces will be <br />created, less than an acre of land will be disturbed, and no work will occur below the 100-year flood level <br />of Lake DeMontreville (Elevation 931.5). <br />The proposed lowest floor is noted on the plans as Elevation 934.0, which is more than two feet above the <br />100-year flood level of Lake DeMontreville and in conformance to the Valley Branch Watershed District <br />rules. <br />The plans show silt fence around the perimeter of the area to be disturbed. While this perimeter fencing <br />will define the construction limits, silt fence should try to follow the ground contours so that runoff <br />doesn't flow next to the fence to a low point and then break through or undermine the silt fence. To <br />prevent this type of erosion control failure, the silt fence on the lake side should be installed to better <br />follow the contours or an additional row of silt fence that follows the contours should be installed. <br />Temporary rock checks or bio-rolls might need to be installed at the areas of concentrated flow to prevent <br />sediment from Ieaving the site. All erosion controls should be installed prior to any earthwork activities, <br />and the site should be re -vegetated as soon as possible. The silt fence should not be removed until the site <br />is re -vegetated. <br />If possible, gutters should be installed.on the house to direct all roof runoff to the front of the lot. A <br />rainwater garden could be constructed at the southwest corner of the site by expanding the existing low <br />area and planting vegetation that will encourage infiltration. <br />If you have any questions, please contact me at 952-832-2622. <br />Sincerely, <br />Jokn P. Hanson, P.E. <br />BARR ENGINEERING COMPANY <br />Engineers for the District <br />c: David Bucheck, VBWD Vice President (via e-mail) <br />Gena Haire, property owner <br />LINCOLN FETCHER DAVID BUCHECK DONALD SCHEEL DALE BORASH DUANEJOHNSON <br />VALLEY BRANCH WATERSHED DISTRICT Wa xbwd.org <br />P.O. BOX 838 LAKE ELMO, MINNESOTA 55042-0538 <br />