ARCHIVED REPORTS_2011 - Laserfiche WebLink

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KLEiNFELDER Visual observations made during drilling indicate that approximately 60 to 70 percent of the fill is largely (at least 90 percent) composed of soil. Approximately 30 percent of the filled area appears to contain layers of disposed waste, which are 15 to 85 percent refuse. Based on these estimated volumes and concentrations,it appears that approximately 25,000 cubic yards of waste was disposed at this site. No volatile organic.compounds were detected in samples of the waste,vadose zone,ground water, or surface water collected in this investigation. Low concentrations of total petroleum hydrocarbons (27 to 94 mg/kg), analyzed by EPA Method 418.1, were detected in the fill and vadose zone below the fill. The samples from the fill had slightly higher concentrations of total petroleum hydrocarbons than did samples ••' from below the fill. These results may indicate the presence of heavier, nonvolatile hydrocarbons or they may indicate the presence of bacteria that are digested by- the aggressive freon extraction method used by Chemwest Analytical Laboratories. High concentrations of some metals (lead, chromium, copper, iron, manganese, and zinc) were detected in samples of the refuse. This appears to reflect the presence of small pieces AMik of metal in the fill. The U.S. EPA estimates that approximately 8.7 percent of disposed refuse is eomposed.of metal. Two samples of the-fill contained concentrations of lead that ' exceed the Total and Soluble Threshold Limit Concentrations for lead. The soluble lead concentrations are artificially high due to the aggressive nature of the WET. Studies have shown that the WET will mobilize 1000 times more lead.than regular municipal leachate. However, no detectable concentrations of lead were reported in samples from the vadose zone below the fill, or in the ground and surface water samples. The other metals detected at high concentrations. in the fill were detected at much lower (in the range of naturally- occurring) concentrations below the.fill, With the exception of iron and manganese, none of these metals were detected in the surface or ground water samples. Iron and manganese were.detected in the surface and ground water samples in concentration at, or above the secondary drinking water maximum contaminant levels for those constituents. Upstream and downstream surface water samples do not differ noticeably, so this is not likely due to F: the landfill. The ground water, based on the sample from MW-1, is a sodium/chloride type, while the surface water is a calcium/bicarbonate type. The total dissolved solids and the chloride concentrations observed in the ground water are higher than observed in a regional study 1.37-88-1663 20