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• Vapor samples from the extraction well will be collected with Tedlar bags at <br /> the beginning of the pilot test and at the end of the pilot test. Collected <br /> samples will be submitted to a California-certified laboratory for total <br /> petroleum hydrocarbon as gasoline (TPHg), benzene, toluene, ethyl benzene, <br /> xylenes, and MtBE analyses. <br /> • Vapor stream measurements in the extraction well, including hydrocarbon levels <br /> with a flame-ionization detector(FID), and flowrate will be measured and <br /> recorded. <br /> The DPE equipment will be restarted and the vacuum and airflow will be allowed to <br /> stabilize. Vacuum pressure and induced pressure at each observation well, and air/vapor <br /> stream flowrate will be recorded. The vacuum pressure will be initiated at the minimum <br /> required pressure (which is the pressure required to overcome the hydraulic head of the <br /> water column in the extraction well). Vacuum pressures at 50% and 100% over the <br /> hydraulic head of the water column in the tested well will be applied. <br />