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KLEINFELDER <br /> TS <br /> The following sections describe the results of the investigation, including the visual <br /> observations and the analytical results of sampling. <br /> 4.1 WASTE, LEACHATE,AND VADOSE ZONE <br /> The character of the waste, leachate, and vadose zone was assessed by drilling four soil <br /> borings through the landfill to collect soil samples for visual inspection and chemical <br /> analysis. <br /> 4.1.1 LOCATION AND VOLUME OF WASTE <br /> Based on the boring logs (Plates 4 through 7) it appears that the thickness of fill material <br /> varies between 10 and 20 feet on the site. However, the fill material is primarily composed <br /> of sand, silty sand, and sandy silt that has been incorporated over the years as the site has <br /> been leveled and graded. Only thin lenses of fill containing more than 10 percent refuse <br /> were encountered in this investigation. This supports Kleinfelder's 1983 investigation, <br /> where three of the four backhoe pits encountered less than 10 percent refuse in the fill. <br /> Cross Section A-A', Plate 8, displays the interpreted fill boundary and areas of refuse <br /> encountered in the four borings. <br /> The refuse encountered was primarily composed of glass, ceramic, metallic slag, and <br /> charred material. This agrees with observations recorded in Kleinfelder's 1983 <br /> investigation. The backhoe pits excavated in 1983 also encountered chunks of concrete and <br /> asphalt. Kleinfelder's observations support historical information that the landfill received <br /> primarily construction debris, leaves, and tree stumps and indicates that this refuse was <br /> likely incinerated on many occasions. <br /> Based on data from previous investigations and a review of aerial photographs taken in <br /> 1963, the areal extent of the landfill appears to be between 15,000 and 18,000 square yards. <br /> The depth of the fill appears to vary between 10 and 20 feet. Therefore, between 50,000 <br /> and 120,000 cubic yards of fill material is contained on site. <br /> 137-88-1663 12 <br />