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0 KLEINFELDER <br /> High concentrations of some metals lead, chromium, copper, iron, manganese, and d zinc) <br /> ' _ML_ <br /> were detected in samples of the refuse. This appears to reflect the presence of small metal <br /> objects that were observed in the fill. Two samples of the fill contain concentrations of <br /> total lead that exceed the Total Threshold Limit Concentration, and of soluble lead that <br /> exceed the Soluble Threshold Limit Concentration. These soluble lead leavels are <br /> artificially high based on research conducted at the Oak Ridge National Laboratory. This <br /> study showed that the WET extracted one thousand times more lead from a waste sample <br /> than municipal leachate. Based on this study, soluble lead should not be a problem at the <br /> landfill. <br /> No detectable concentrations of lead were reported in samples from the vadose zone below <br /> the fill, or in the ground and surface water samples. This indicates that the lead is much <br /> less soluble in the environment of the landfill than in the low pH conditions of the Waste <br /> Extraction Test. It is unlikely that this landfill, given the nature of the waste, would <br /> produce the acid to create such low pH conditions. The other metals detected at high <br /> concentrations in the fill were also detected at much lower concentrations (in the range of <br /> naturally-occurring) in the vadose zone. With the exception of iron and manganese, none <br /> of these metals were detected in the surface or ground water samples. Iron and manganese <br /> were detected in the surface and ground water samples in concentrations at, or above, the <br /> secondary drinking water maximum contaminant levels for those constituents. Upstream <br /> and downstream surface water samples do not differ noticeably, so this is not likely due to <br /> the landfill. <br /> The ground water, based on the sample from MW-1, is a sodium/chloride type, while the <br /> surface water is a calcium/bicarbonate type. The total dissolved solids and the chloride <br /> concentrations observed in the ground water from MW-1 are higher than observed in a <br /> regional study performed by the U.S. Geological Survey in 1981. This may indicate that the <br /> regional ground water chemistry has changed over time, becoming more like the regional <br /> ground water south and west of the site, or it may indicate a difference between the <br /> uppermost zone of ground water monitored by MW-1 and the deeper zones of ground <br /> water most likely represented by the USGS study. <br /> Based on the data collected in this investigation, there is no evidence of leakage of <br /> hazardous waste from the landfill into the ground water, surface water, or vadose zone. <br /> The only constituent encountered in the refuse at a hazardous concentration was lead. <br /> 137-88-1663 2 <br />