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70-1029-02 <br />E <br />At the French Camp landfill, results of the air quality solid waste. <br />assessment test (SWAT) field program indicate that although certain target <br />constituents were measured above detection limits in the air samples, air <br />contaminants apparently are not being emitted from the landfill into the <br />ambient atmosphere at levels which would be likely to pose a potential <br />threat to public health or safety. Vinyl chloride was not detected in any <br />of the ambient air samples submitted for analysis. only three Attachment 1 <br />compounds (perchloroethylene, carbon tetrachloride, and methyl chloroform) <br />were present in measurable quantities. None of these compounds was <br />detected in every sample. <br />Gas stream characterization consisted of internal landfill gas testing and <br />integrated surface sampling. The landfill gas was sampled at five. driven <br />well locations, and the samples were analyzed for fixed gases and <br />Attachment 1 conpounds. Of the ten constituents of concern, only two were <br />measured above detection limits in one or more of the samples <br />(perchloroethylene and trichloroethylene). The eight remaining campounds <br />were not detected in any gas sample. Methane concentrations in the gas <br />ranged frcin 3.5 percent to 57.1 percent by volume. <br />In addition, an integrated sample was collected immediately above the <br />surface of the approved 50,000--square-foot grid. The sample was tested for <br />the presence of Attachment 1 conpounds and total organic compounds (ToCs). <br />Three constituents were measured in the low parts -per -billion (ppb) range. <br />These included benzene, perchloroethylene, and methyl chloroform. <br />Trichloroethylene, which was present in two of the interior gas samples, <br />was not detected in the surface air sample. The TOC concentration was <br />3 ppm (measured as total methane and nonmethane hydrocarbons). <br />ow <br />