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4 <br /> i <br /> each wellwill be gauged in order of increasing petroleum hydrocarbon concentrations based on <br /> laboratory results of previous groundwater sampling. . <br /> Groundwater Sampling Procedures <br /> Prior to sampling, each well will be purged of water using a PVC bailer. Fast recharging wells <br /> will be purged of at least four casing-volumes of water. Slow recharging wells will be purged <br /> until dry and allowed to recover"for at least two hours before sampling. Each casing volume will <br /> be field tested for temperature, conductivity, and pH. Turbidity and dissolved oxygen will be <br /> measured after the last or fourth casing volume. . <br /> Each groundwater sample will be collected using a Teflon® bailer, -equipped with.a bottom- k <br /> em <br /> ptymg device attached to clean, coin_ rnercial twine and gently lowered into the well. The <br /> bailer will be all to sink into the standing water, and once filled will be recovered. The <br /> water from the bailer will then be slowly poured into 40-m1 VOA vials with Teflon® septa, in a <br /> manner that prevents air bubbles',from being trapped within the sample vial. Each sample will be <br /> placed on ice to reduce volatilization, prior to being received by the analytical laboratory. In <br /> addition to the groundwater samples from the wells, a rinsate blank and duplicate sample will be <br /> prepared to verify the integrity of the sampling and laboratory procedures. <br /> Each groundwater sample will be delivered under chain of custody to a state-certified analytical <br /> laboratory :for chemical analyses. Each groundwater sample will be tested for total petroleum <br /> hydrocarbons as gasoline using EPA Method 8015M and for BTEX, MTBE, DIPE, TBA, ETBE, <br /> and TAME using EPA Method 8620B. <br /> Groundwater purged from the monitoring wells will be transported to a holding tank at the <br /> Equilon Enterprises LLC (Equilon) facility in Carson, California. Purged water will be'collected- <br /> at the Carson facility and then transported'under a Bill of Lading to the Equilon Refinery in <br /> Martinez, California, for recovery of the Hydrocarbons. The removal and transport of the purged ' <br /> water from the subject facility to the Equilon Carson facility will be documented on the Wayne . <br /> Perry, Inc. Cargo Manifests. <br /> All re-usable sampling equipment, including bailers, were washed in cion-phosphate soap and <br /> double-rinsed in distilled water between wells to reduce the possibility of cross-contamination. <br /> i <br /> �F <br />