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s <br />AKANSON <br />4 NDERSON <br />ASSOCIATES, Inc. <br />P.O. Box 665 222 Monroe Street <br />Mr. Ted Feig <br />15510 Post Road <br />Wayzata, Minnesota <br />55391 <br />Re: Feig Percolation Test <br />Dear Ted: <br />professional engineers and surveyors <br />Anoka, Minnesota 55303 <br />June 8, 1981 <br />6121427.5860 <br />At your request additional percolation testing was performed at Lot 1 Laurent <br />Addition in Orono, Minnesota to identify new locations for the primary and <br />secondary septic system areas. The location selected by you for the proposed <br />house covers the area chosen, by us for the primary septic system in our <br />percolation test report of April 14, 1981 (File: 795.01). Standard methods <br />of percolation testing were employed. Elevations are relative to an assumed <br />elevation of 100.0 based at a single spike placed in the east face of the power <br />pole located near the south lot line of Lot 1 (see enclosed sketch). <br />This report includes: <br />1. Soil boring logs <br />2. Percolation test results <br />3. Testhole location and septic system configuration sketch <br />4. Septic system design specifications <br />5. Discussion and recommendations. <br />The soil boring log shows that silt loam to silty clay loam surface soils <br />overlie mottled and gleyed clayey subsurface horizons. Soil mottles (spots of <br />contrasting color) begin at 1.2 to 2.0 feet depth at the borenoles. Soil <br />mottling is an accepted indicator of periodic saturation in soils. Gleyed <br />areas (dull gray soil color) begin at 3.0 to 4.0 feet depth at the boreholes. <br />Gleying forms in soils which are saturated and in a chemically reduced condition <br />for long periods of time. Ground water was observed at about elevation 91.8 at <br />the test site. Because the City of Orono requires at least three (3.0) feet <br />elevation di."ference between the bottom of standard drainfield trenches and the <br />water table or indicators of periodic soil saturation, an alternate type of <br />septic system, the mound (also called the berm) system is recommended for this <br />site. <br />Percolation test results show that measured percolation rates are faster than <br />the 120 minute per inch minimum rate for mound systems. <br />civil • municipal 0 planning 0 soils land surveyiN <br />