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PHorr�: 763-633-2222 <br /> F�vc:763-633-2224 <br /> Miller Environmental Inc. 11040 183rd Circle N.W.,Suite AA•Elk River,MN 5533Q <br /> May 10,2007 <br /> Jud Champlai.n <br /> 900 Second Avenue South; Suite 1400 <br /> Minneapolis, Minnesota 55402 <br /> Subject: Onsite Wastewater System(OWS) Design <br /> A. Legal Description <br /> 210 Big Island; Lake Minnetonka; City of Orono; Hennepin County ' <br /> B. Site Conditions <br /> The property is located on an island of Lake Minnetonka. From the lake the property slopes up a � <br /> 10%— 12%incline with mature maple and oak trees. <br /> C. Soil Conditions ! <br /> t <br /> The Hennepin County soil survey mapped the azea as the Lester Series. The Lester Series is the j <br /> Minnesota state soil and is very common in Des Moines Lobe glacial till deposits of central ! <br /> Minnesota, specifically Wright and Hennepin Counties. j <br /> � <br /> The soil survey indicates the soils in the Lester Series are very deep, well drained loamy soils � <br /> formed in glacial till. Six soil borings were completed in the general area of the proposed and � <br /> alternate drain field areas, see Fig. 1. i <br /> I <br /> The results of the soil borings indicate that the potential for seasonal saturation exists at 31-34" i <br /> below the surface in the azea investigated. This is evidenced by the presence of distinct I <br /> redoximorphic features. Redoximorphic features in a higher landscape position such as this are i <br /> likely the result of a stalled wetting front within the fine texture soils and will likely only occur I <br /> sporadically; however the site cannot support a standard subsurface drain field without achieving ' <br /> additional vertical separation distance reductions prior to dispersal. Percolation tests completed <br /> indicates the underlying soil has an average percolation rate of 7.5 minutes per inch at the depths <br /> tested. <br /> � <br /> D. Selection and Sizing of Treatment Svstem ' <br /> The existing residence is a small two bedroom seasonal cabin without a well. To accommodate ' <br /> possible future construction the Onsite Wastewater System (OWS) will be designed to accommodate <br /> 1 <br />