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were analyzed for 10 Volatile Organic Compounds (VOCs) set forth by the <br /> Calderon Guidelines: vinyl chloride, benzene, ethylene dibromide, <br /> 1,2-dichloroethane, methylene chloride, tetrachloroethylene, carbon <br /> tetrachloride, 1,1,1-trichloroethane, trichloroethylene, and chloroform. <br /> The samples were also analyzed for major landfill gas components such as <br /> methane, oxygen, nitrogen, and carbon dioxide. <br /> In areas of buried municipal refuse, the major gas components detected <br /> in the gas wells were methane, nitrogen, and carbon dioxide. Methane <br /> ranged from 6.6 to 40 percent by volume. Methane and carbon dioxide are <br /> considered to be by-products of anaerobic degradation in landfills. <br /> Several volatile organic compounds were detected in the gas characteri- <br /> zation study as well. Vinyl chloride (480 ppb), benzene (3000 ppb), <br /> 1,2-dichloroethane (110 ppb), methylene chloride (23000 ppb), <br /> tetrachloroethylene (4800 ppb), 1,1,1-trichloroethane (2400 ppb), <br /> trichloroethylene (3400 ppb), and chloroform (11 ppb) were detected in <br /> one or more gas wells. Ethylene dibromide and carbon tetrachloride were <br /> not detected in any of the monitoring wells (2). <br /> On May 25, 1988, EMCON Associates used an integrated surface sampler to <br /> determine locations of potential gas seepage through the landfill cover. <br /> A 50,000 square foot grid was plotted to form the walking pattern to be <br /> covered during the collection of approximately 8 liters of surface air <br /> (2). For the location of the walk grid, see Figure 3-4. Benzene (0.4 <br /> ppb), methylene chloride (6-9 ppb), tetrachloroethylene (0.2 ppb), and <br /> 1,1,1-trichloroethane (52 ppb) were the only volatile organic vapors <br /> that were detected in the surface walk sample. Benzene and <br /> tetrachloroethylene concentrations were at or below their regulatory <br /> detection limits of 2 ppb and 0.2 ppb, respectively. For results of the <br /> landfill gas characterization analysis, see Appendix D. <br /> Ambient air was sampled on February 17, and on March 2 and 3, 1988. Two <br /> 24-hour ambient air sampling devices were placed on the perimeter of the <br /> site and 12 samples were taken. A downwind sampling device was <br /> installed on the southern boundary of the site and an upwind device was <br /> 3-11 <br /> sa/tm/chl/si <br />