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A <br />May 22, 1978 <br />Mr. Don Roderick <br />1925 County Road 24 <br />Long Lake, Minnesota 55356 <br />545 Indian Mound <br />Wayzata, Minnesota 55391 <br />(612)473-4224 <br />-7kiy P19r wN ""-D <br />Re: Percolation Test for Tract A, Registered Land Survey No. 1275 <br />Orono, Minnesota, Job No. 11-78-22 <br />Dear Mr. Roderick: <br />Enclosed is information requested for an on -land sewage treatment <br />system for the above -referenced lot. <br />The drainfield information was based on percolation tests and soil <br />borings performed on May 10, 11, 18, and 19, 1978. <br />The average rate of percolation for the primary site, as tested, <br />was 32.7 minutes/inch. The average rate of percolation for the <br />secondary site, as tested, was 20.0 minutes/inch. The location of <br />the percolation test holes are indicated in Figure 1. <br />Soil borings were augered to a depth of eight feet (81). The soil <br />logs of the soil borings are shown in Table 1. The location of <br />the soil borings, as well as the soils map, are shown in Figure 1. <br />Because of an acceptable percolation rate of 32.7 minutes/inch and <br />because of an acceptable depth to the water table,'*a conventional <br />on-site sewage treatment system is recommended for the priniary <br />site. Due to the high water table, and the steepness of the slope, <br />an "innovative shallow trench system" is recommended for the <br />secondary site. <br />Stated percolation rates are averaged for the location shown, and <br />no guarantee is implied or expressed that these conditions exist <br />for the entire test area. <br />If you have any questions, please do not hesitate to contact me. <br />Sincerely, <br />EUGENE A. HICKOK & ASSOCIATES <br />Ames P. DeBenedet, P. E. <br />JPD/jel <br />Enclosures <br />