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SSOCIATES <br />ENGINEERS & LAND SURVEYORS, INC. <br />December 15, 1997 <br />Dan Anderson <br />ANCO Construction Company, Inc. <br />3540 Montgomerie Avenue <br />Deephaven, MN 55391 <br />RE: SoU Tests on “LITTLE ORCHARD’ <br />Otto Job No. 97503 <br />'*An <br />Dear Dan: <br />As you are aware, we have finished the soil tests for on-site septic system suitability on the Orono <br />site. I enclose three sets of the soil boring logs and the percolation test sheets. <br />As you look these over, some critical points are that in order to put the shallowest trench system <br />in, we need at least 42 inches to the mottled soil in the soil borings. A mound system can be <br />installed if there is at least 12 inches to the mottled soil. Soil borings 1, 3, 4, 5, 7,10,11,12,15, <br />17,18,19,20,21,22,24 and 26 have a depth of 42 inches or more to the mottled soil. All the soil <br />borings have more than 12 inches to the mottling. <br />In the perc tests, we are looking for a perc rate from 5 to 60 minutes per inch for a standard <br />system (with 5 being fast and 60 being slow). The majority of the tests indicate a perc rate <br />between 8 and 40 m.p.i. The only two tests that I am concerned about are THs 27 and 28 which <br />had a per rate of 79. These holes were tested in what I would think would be the alternate site on <br />Lot 3 and a mound system could be installed on this type of soil but the basal area of the mound <br />would need to be enlarged. <br />So, in conclusion, these tests were good and do indicate that all the lots are buildable using on-site <br />septic systems. If you have any questions, call me. <br />Sincerely, <br />Otto Associates <br />Engineers and Land Surveyors, Inc. <br />Edward J. Ott^L.S. <br />MPCA No. 964 <br />Enclosures