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{ <br /> MPDS-UN-0788-01 <br /> January 13, 1994 <br /> ` Page 2 <br /> h <br />{ <br /> HYDROLOGY <br /> The ground water elevation in each monitoring well at the Unocal <br /> site on November 30, 1993 , is summarized in Table 1 . The ground <br /> water flow direction at the Unocal site during the most recent <br /> quarter is shown on the attached Potentiometric Surface Map, Figure <br /> 1 . <br /> ANALYTICAL RESULTS <br /> The ground water samples collected this quarter were analyzed at <br /> Sequoia Analytical Laboratory and were accompanied by properly <br /> executed Chain of Custody documentation. The samples were analyzed <br /> for total petroleum hydrocarbons (TPH) as gasoline by EPA method <br /> 5030/modified 8015, TPH as diesel by EPA method 3510/modified 8015, <br /> and benzene, toluene, ethylbenzene, and xylenes (BTEX) by EPA <br /> t method 8020 . <br /> The analytical results of all of the ground water samples collected <br /> s from the monitoring wells to date are summarized in Table 3 . The <br /> concentrations of TPH as gasoline, benzene, and TPH as diesel <br /> detected in the ground water samples collected this quarter are <br /> t shown on the attached Figure 2 . Copies of the laboratory analyti- <br /> cal results and the Chain of Custody documentation are attached to <br />; <br /> this report . <br /> DISTRIBUTION <br /> A copy of this report should be sent to Ms . Mary Meays of the San <br /> Joaquin County Public Health Services, Environmental Health <br /> Division, and to the Regional Water Quality Control Board, Central <br /> Valley Region. <br /> is <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 /> i <br /> i <br /> t <br />