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A-2 <br /> Upon recovery, a portion of the soil sample was placed in a plastic bag and sealed for later screening <br /> with an hNu type organic vapor meter (OVM). Another portion of the soil sample was used for <br /> classification and description. One of the samples was sealed in the brass tube and stored at <br /> approximately 4°C for transport to the laboratory for chemical analysis. After the soil samples, placed <br /> in a plastic bags, were allowed to warm, inducing volatilization of petroleum hydrocarbon vapors, the <br /> headspace vapors were screened with the organic vapor meter. The highest observed reading and was <br /> then recorded on the boring logs. <br /> Soil cuttings generated from the drilling activities were stockpiled and sampled for laboratory analysis <br /> of benzene, toluene, ethylbenzene, xylenes (BTEX), and total petroleum hydrocarbons (TPH) as gasoline <br /> and organic lead. <br /> 4.0 GROUND WATER DEPTH DETERMINATION <br /> Depth to ground water was measured to the nearest 0.01 foot using an electronic hand held water level <br /> indicator. The tip of the probe was examined to determine whether a product sheen was present. <br /> 5.0 MONITORING WELL DEVELOPMENT/PURGING AND SAMPLING <br /> Following the installation of newly installed wells a surge block is used to remove fines from the sand <br /> pack. After surging, a minimum of six casing volumes of ground water were purged from the wells <br /> using a bailer to remove sediment and insure representative sample quality. Already existing ground <br /> water monitoring wells are purged of a minimum of three casing volumes utilizing a clean pump. Ground <br /> water generated from the purging of the wells was stored in labeled drums and will be transported to a <br /> permitted facility for disposal. <br /> After the water level, pH, temperature, and conductivity of the ground water within the wells were <br /> allowed to stabilize a sample was collected with a dedicated, clean, disposable plastic bailer. Samples <br /> were contained in air-tight vials and then packed on ice and sent to the laboratory for analysis of BTEX <br /> and TPH as gasoline. Ground water samples were transported to the laboratory and analyzed within the <br /> EPA-specified holding time for requested analysis. <br /> L.RP253.TA <br />