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KLEINFELDER <br /> frequent identifications were detected in the upgradient monitoring well (MW-1). Of the <br /> metals detected,vanadium was detected in the downgradient monitoring well but not in the <br /> upgradient well. Vanadium was only detected once, and at the reporting limit. <br /> The water type does not appear to be affected by the landfill. Ground water in the region <br /> appears to be a calcium/bicarbonate water. There may be seasonal variations when <br /> relative sodium and magnesium concentrations increase. <br /> 6.3 POTENTIAL THREATS TO WATER QUALITY DUE TO MIGRATING GASSES <br /> The AIR SWAT was performed by Emcon Associates. They reported that the landfill <br /> gasses contained methane, carbon dioxide and volatile organic compounds. They reported <br /> that methylene chloride, carbon tetrachloride and TCE were detected above the reporting <br /> limits in downwind ambient air samples. They also reported methane concentrations <br /> greater than or equal to 9 percent in two perimeter probes. <br /> To impact water quality, the landfill gasses would most likely have to take one of the <br /> following routes: <br /> 1) migrate 150 to 200 feet vertically downward, through siltstones and claystones, and <br /> dissolve in ground water <br /> 2) dissolve in leachate at the landfill bottom, if any existed, and migrate downward <br /> with the leachate to ground water <br /> 3) condense to form a leachate and migrate downward as leachate to ground water. <br /> No saturated zone was observed at the waste/soil boundary, and no volatile organic <br /> compounds were detected in the soil samples collected at or below the waste/soil _ <br /> boundary. Therefore, there is little evidence exists to suggest that migrating gasses are <br /> impacting water quality. <br /> s 6.4 DESCRIPTION OF REMEDIAL MEASURES <br /> No interim remedial measures are in effect or proposed at this site. <br /> FOOTHILL 36 <br />