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n KLEINFELDEK <br /> performed by the U.S. Geological Survey in 1981. This may indicate that the regional <br /> ground water chemistry has changed over time, becoming more like the regional ground <br /> water south and west of the site, or it may indicate a difference between the uppermost <br /> zone of ground water monitored by MW-1 and the deeper zones of ground water most <br /> likely represented by the USES 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 /> This most likely reflects the presence of pieces of metal that were observed throughout the <br /> waste: Metals,including lead,are a normal constituent in landfills. <br /> Kleinfelder recommends that this landfill be granted an exemption from performing a Solid <br /> Waste Assessment Test, under the provisions of Section 13273.1 of the Porter-Cologne <br /> Water Quality Control Act.: The landfill appears to have:received less than 50,000 cubic <br /> yards of waste, and does not appear to contain, or be leaking,hazardous waste other than <br /> pieces of metal debris. <br /> 137-88-1663 21 <br />