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KLEINFELDER <br /> feet into the landfill. Samples of gas were collected from these wells and were submitted, <br /> along with a blind sample blank, to Coast Analytical Services for Analysis of: <br /> Ethylene didromide <br /> Benzene Methylene chloride <br /> 1,2-Dibromoethane Oxygen Tetrachloroethylene (PCE) <br /> 1,2-Dichloroethane Nitrogen <br /> 1,11-Trichloroethane(TCA) Carbon Tetrachloride <br /> Trichloroethylene(TCE) Methane Carbon Dioxide <br /> Vinyl Chloride Chloroform <br /> Nitrogen <br /> The laboratory reported that the landfill gas sample consisted largely of methane 63 to 76 <br /> percent and carbon dioxide 24 to 31 percent. The laboratory also reported the detection of <br /> benzene, 1,2-dichloroethene, methylene chloroform, chloride, PCE, TCA, TCE, and vinyl <br /> chloride in the sample. The laboratory results are given in Tables 3 and 4 of the Emcon <br /> AIR SWAT Report (Appendix G). <br /> 5.1.2. Ambient Air Monitoring <br /> Two 24-hour ambient air samples were obtained downwind of the southern(oldest) portion <br /> of the landfill. These samples were submitted, along with a sample blank, to Central Coast <br /> Analytical Services for analysis of the following ten volatile organic compounds: <br /> Chloroethene Tetrachloromethane <br /> Benzene 1,1,1-Trichloroethane <br /> 1,2-Dibromoethane Trichloroethylene <br /> 1,2-Dichloroethane Trichloromethane <br /> Dichloromethane Toluene <br /> Tetrachloroethene Xylene <br /> Benzene, methylene chloride, PCE, carbon tetrachloride, TCA and TCE were detected in <br /> the ambient air samples. Of these chemicals, methylene chloride, carbon tetrachloride, <br /> and TCE were above their respective detection limits only in the downwind air samples, <br /> indicating the landfill may be producing these chemicals. Concentrations of the other <br /> chemicals were relatively similar in upwind and downwind ambient air samples. <br /> FOOTHILL 32 <br />