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' , <br /> ' <br /> Phone: 763-370-596] <br /> ' — Fax: 763-441-9176 <br /> � 333 Main Strcet; Elk Ri�cr. MN S:i330 <br /> M�LIER ENVIRONMENTAL INCORPORATED <br /> ' July 5, 2005 <br /> ' Minnetonka Power Squadron <br /> Attention: Lt/C Gregory E. Korstad <br /> ' 39258 Evergreen Lane North <br /> Plymouth, Minnesota 55441 <br /> ' Subject: Onsite Wastewater System (OWS) Design <br /> ' Le�al Description - Located on Big Island; Lake Minnetonka; City of Orono; Hennepin County <br /> Site Conditions - The property has an existing pit privy and private well. The privy is proposed to be <br /> ' abandoned and a new bathroom and shower facility constructed. The building and OWS site is <br /> predominantly vegetated with mature deciduous trees on a 8-12% slope. <br /> ' Soil Conditions — The Hennepin County soil survey mapped the azea 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 co of the descri tion for the Lester Series is included in A endix A. The soil surv <br /> PY P pp ey indicates the <br /> , soils in the Lester Series are very deep. well drained loamy soils formed in glacial till. Six soil borings <br /> were completed in the area of the proposed and alternate drain field areas, see Figure 1. Our soil borings <br /> closely matched the soil survey description of the Lester Series in the proposed drain field location, <br /> ' while the alternate drain field locations showed signs of saturation closer to the surface similaz to the <br /> Angus Series. <br /> ' Soil borings 1, 4 and 6 in the primary drain field azea indicate the site is underlain by high chroma loam <br /> and clay loam soils to approximately 5 feet. The parent material for the area, high chroma loam soils <br /> with many threads of calcium carbonates (often misidentified as low chroma iron reductions), were <br /> , found to the depth of the borings. Many gray sand coatings on ped faces, calcium carbonates, and <br /> reddish iron concretions (referred to as ochres in rhe geologic culture) were observed. These soil <br /> features are a result of the soil parent material not a fluctuating seasonal water table. <br /> ' Soil borings 2, 3 and 5 in the alternate drain field area found similar soil profiles; however due to <br /> landscape position it appears the accumulation of downward water from upslope locations is causing <br /> ' perched saturation. The alternate drain field location would likely need a mound drain field. <br /> ' 1 <br /> ' <br />