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Miller Environmental Inc. <br />August 16, 2006 <br />Tim Peterson <br />16415 Linch A venue <br />Lakeville, Minnesota 55044 <br />Subject: Onsite Wastewater System (OWS) Design <br />F3 <br />PHONE: 763-633-2222 <br />FAX: 763-633-2224 <br />11040 183rd Circle N.W., Suite AA• Elk River, MN 55330 <br />Legal Description -560 Big Island; Lake Minnetonka; City of Orono; Hennepin County <br />Site Conditions -The property is located on an island of Lake Minnetonka. From the lake the property <br />slopes up a 12% -18% incline with mature maple and oak trees to a plateau where the residence will be <br />located. <br />Soil Conditions -The Hennepin County soil survey mapped the area as the Lester Series. The Lester <br />Series is the Minnesota state soil and is very common in Des Moines Lobe glacial till deposits of central <br />Minnesota, specifically Wright and Hennepin Counties. <br />A copy of the description for the Lester Series is included in Appendix A. The soil survey indicates the <br />soils in the Lester Series are very deep, well drained loamy soils formed in glacial till. Five soil borings <br />were completed, four in the area of the proposed and alternate drain field areas, see Figure 1. The soil <br />borings closely matched the soil survey description of the Lester Series in the proposed drain field areas. <br />'? Soil borings indicate the site is underlain by high chroma loam, sandy loam, and clay loam soils to <br />approximately 5.5 feet. The parent material for the area, high chroma loam soils with many threads of <br />calcium carbonates ( often misidentified as low chroma iron reductions), were found to the depth of the <br />borings. Many gray sand coatings on ped faces, calcium carbonates, and reddish iron concretions <br />(referred to as ochres in the geologic culture) were observed. These soil features are a result of the soil <br />parent material not a fluctuating seasonal water table. <br />Soil percolation testes were performed at the locations shown on Figure 1. The results from the tests are <br />in Appendix A. <br />The results of the soil borings and percolation tests indicate that the site can support a standard <br />subsurface drain field at the proposed area depicted on Figure 1. A soil sizing factor of 2.2 square feet <br />per gallon per day has been selected. <br />Sizing of Treatment System -The proposed residence will consist of less than 2,000 square feet with <br />three bedrooms and two water using devices; a dishwasher and clothes washer. The residence is <br />~-----J <br />1