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hydrogeologic study of the eisinger landfill <br />INTRODUCTION <br />In April of 1973, Mr. Howard Eisinger of Orono, Minnesota, retained <br />our services to perform a hydrogeologlc analysis for his proposed demo­ <br />lition landfill. The site is located approximately li miles west of Long <br />Lake in the SWi of the NEi of Section 32. T 118N, R 23W. Over the past <br />sixteen years, demolition debris and solid wastes have been placed In <br />the site. The site was closed in 1970,by the owner. <br />This study includes an analysis of soils adjacent to and beneath <br />the site, ground and surface water conditions, and the probable effect <br />of additional demolition fill placement on ground and surface waters. <br />GEOLOGY AND TOPOGRAPHY <br />The project is located in a rolling hilly area north of Stubbs <br />Bay on Lake Minnetonka. This is a moraine area formed during the latest <br />glacial advance which in this location was the Des Moines lobe of the <br />Wisconsin glacial period. The area is poorly drained with many depres­ <br />sions containing swamps, marshes, and lakes. The fill site is located <br />in one of these marshy areas. Figure 1 shows the location of the site. <br />Bedrock beneath the site should exist at approximately elevation <br />760 (about 210 feet below the marsh level at the site). Information from <br />Schwartz^ indicates that the uppermost bedrock layer should be the Jordan <br />Sandstone Formation. <br />Soils information was available from several sources. On April 26, <br />1973. three soil borings were taken at locations shown in Figure 2. Logs <br />of the borings are shown in the appendix to this report. The borings <br />indicate that peat and muck varying in depths up to 35 feet exists beneath <br />the proposed landfill site. Underlying the peat and muck are silty loam <br />to clay soils, gray in color, and most likely glacial till similar to <br />that seen in nearby surface exposures. <br />Seventeen rod soundings taken in the east marsh on the Eisinger <br />property indicated that, except near the adjacent upland areas, peat and <br />muck depths are over 18 feet. <br />The Soil Conservation Service indicates that the typical upland <br />soils adjacent to the Eisinger marsh are glacially derived loams and clay <br />!