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� , �, � � � 3� <br /> GERALD M. SUNDE, Con:ulting Enyinesr <br /> 10524 ZION AVENUE SOUTH • MINNEAPOIiS, MN 55437 • PHONE (612) 881-3344 <br /> August 2, 1978 <br /> � <br /> Mr. Donald C. Mogen <br /> 1170 Lyman Avenue <br /> Wayzata, Minnesota 55391 <br /> Dear Mr. Mogen: <br /> Re: Soil Borings and Percolation Tests <br /> Lot Adjacent to Mogen Residence on <br /> Lyman Avenue, Orono, Minnesota <br /> As you requested, we have performed a soil boring program and <br /> percolation tests to assist in evaluating soil types, soil absorp- <br /> tivity and groundwater conditions for the installation of an <br /> individual sewer system on the above property. <br /> The borings and percolation test locatians are shown on the <br /> attached plan. They are at locations discussed during my visit to <br /> the site on July 28, 1978. Primary and secondary drainfield locations <br /> are shown on the attached plan and are both generally located on a <br /> relatively flat area to the rear of the proposed house. <br /> Surface elevations were determined by an approximate survey of <br /> the site. The ground level at the southwest corner of the proposed <br /> house was used as the survey datum (assumed as 100.0) . Site contours <br /> should be determined with greater accuracy prior to doing detailed <br /> building and landscape design. <br /> Investigative Methods <br /> The soil borings were taken on July 30, 1978, by 2'� diameter <br /> hand auger to a depth of 8 feet. Soils were visually classified in <br /> accordance with the Unified System. The borings were probed at com- <br /> pletion and the following day for the presence of groundwater. <br /> Percolation tests were run in 6 inch diameter holes in accordance <br /> with the procedures recommended by the Minnesota Department of Health. <br /> In accordance with standard procedures, the holes were allowed to soak <br /> overnite. <br />