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• <br /> 59 <br /> Terracon <br /> Mr. Randy Schafer <br /> Page 4 <br /> June 23, 1993 <br /> ELI Project No. 20935124 <br /> other times or at other locations. Groundwater levels can be expected to fluctuate with varying <br /> seasonal and weather conditions. <br /> Zones of perched and/or trapped groundwater may also occur at times in the subsurface soils, <br /> overlying bedrock or within permeable fractures in the bedrock materials. The location and amount <br /> of perched water is dependent upon several factors, including hydrologic conditions, type of site <br /> development and seasonal and weather conditions. <br /> Fluctuations in groundwater levels can best be determined by implementation of a groundwater <br /> monitoring plan. Such a plan would include installation of groundwater monitoring wells and <br /> periodic measurement of groundwater levels over a sufficient period of time. <br /> A composite sample of the weathered claystone-sandstone obtained from Boring 2 at a depth of <br /> 35 to 40 feet was tested for Atterberg limits, moisture-density relationship (standard Proctor), and <br /> permeability. According to the Atterberg limits, the material classifies as a sandy lean clay. The <br /> moisture density relationship indicates the material has a maximum dry density of 111.4 pounds <br /> per cubic foot at an optimum moisture content of 15.4 percent. According to the falling head <br /> permeability test, the material has a permeability of 0.11 x 10"' centimeters per second when <br /> compacted to 95.6 percent of standard Proctor maximum dry density. In our opinion, the <br /> permeability rate of 1 x 104 centimeters per second or slower is considered relatively <br /> impermeable. <br /> The evaluation and discussion in this report are based on information obtained from the test <br /> borings and laboratory testing performed under your direction. This report does not reflect any <br /> variations which may occur between borings or across the site. <br />