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MPDS-UN5098-06 <br /> . March 8, 1995 <br /> Page 2 <br /> four casing volumes had been removed from each well, samples were then <br /> collected using a clean Teflon bailer. The samples were decanted into <br /> clean VOA vials and/or one-liter amber bottles, as appropriate, which <br /> were then seled with Teflon-lined screw caps, labeled, and stored in <br /> a cooler, on ice, until delivery to a stateVicertified laboratory. MPDS <br /> JR.' efinery <br /> ervices, Inc transported the purged ground water to the Unocal <br /> located in Rodeo, California a'`, -Eor treatment and discharge to <br /> San Pablo Bay under NPDES permit . <br /> ANALYTICAL RESULTS <br /> The ground water samples collected from the Unocal wells were analyzed <br /> at Sequoia)Analytical Laboratory and were accompanied by properly <br /> executed Chain of Custody documentation. The analytical results of the <br /> ground water samples collected from the Unocal wells to date are summa- <br /> rized in Table 3 . The concentrations of Total Petroleum Hydrocarbons <br /> (TPH) as gasoline and benzene detected in the ground water samples <br /> collected from the Unocal wells this quarter are shown on the attached <br /> Figure 2 . Copies of the laboratory analytical results and the Chain of <br /> Custody documentation for the Unocal wells are attached to this report . <br /> LIMITATIONS <br /> Environmental changes, either naturally-occurring or artificially- <br /> induced, may cause changes in ground water levels and flow paths, <br /> thereby changing the extent and concentration of any contaminants . <br /> DISTRIBUTION <br /> A copy of this report should be sent to the San Joaquin County Public <br /> Health Services, to the Regional Water Quality Control Board, Central <br /> Valley Region, and to Mr Frank Muramoto of Environmental Audit, Inc . <br /> I <br /> i <br />