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• VOCs: vinyl chloride, benzene, ethylene dibromide, 1,2-dichloroethane, methylene chloride, tetrachloroethyl- ene, carbon tetrachloride, 1,1,1 -trichloroethane, tri- chloroethylene, and chloroform • Major landfill gas components: methane, oxygen, nitro- gen, and carbon dioxide Analysis was performed by Central Coast Analytical Services (Central Coast) of San Luis Obispo, California. As stated in Section 1.0, the laboratory analyzed for the VOCs using GC/MS instead of GC, as de- scribed in the Guidelines. The detection limits for GC/MS are equal to or below the regulatory detection limits. Analytical procedures are presented in Appendix D. 2.4.2 Integrated Surface Walk On February 24, 1988, two integrated surface samples were collected (approximately 8 liters each). The site was dry and no rain had fallen in 72 hours. The technician held the sampling probe approxi- mately 2 to 3 inches above the landfill surface. The collection flow rate was set to approximately 333 cubic centimeters per minute. The actual flow rate was also recorded. The technician walked the grid through a course of approximately 2,600 linear feet over a continuous 25 -minute period. An anemometer and wind vane with a continuous recorder were installed at the landfill site to record wind speed and direction data. The location of the meteorological station was changed because the pro- posed location was found to be adjacent to the active disposal area of the landfill. In order to prevent damage to the equipment from traffic in the active disposal area, a new location was selected closer to the center of the landfill (see Figure 1). Both wind speed and direction were recorded continuously during the integrated surface sampling periods. After the integrated surface walk area had been sampled, the wind speed data were reviewed. The average wind speed was below 5 mph and the instantaneous wind speed did not exceed 10 mph. See Table 1 for integrated surface walk wind data.