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a <br /> r <br /> r <br /> PM) WEISS ASSOCIATES Consulling in Geology & Gcohydroloyy <br /> 2.938 McClure Street, Oakland, CA 9.1609 415.465.1100 <br /> I <br /> 2 Much 1989 ;jI e'A64 <br /> Lisa Marinaro <br /> K. G. HUFFh1.AN <br /> Chevron USA <br /> P.O. [lox 5004 MAR 3 W'D <br /> San :*amon, CA 94583-0804 rr;Ytl �� i5 R�Icr �kl <br /> Re: o Chevron Service .station #96465 <br /> 96465 North Pershing <br /> Stockton,California <br /> WA Job #4-305-01 <br /> Dear Ms. Marinaro: <br /> Weiss Associates(WA) collected ground water samples from five monitoring wells on <br /> 1§ and 19 December 1988 as part of the quarterly ground water monitoring program at <br /> Chevron Service Station#96465 in Stockton,California(Figure 1). Monitoring wells MW-1 and <br /> MW-3 were not sampled because there was insufficient water in these wells. Monitoring wells <br /> MW-2,MW-4,MW-6,and MW-7 contained benzene and/or I,2-dichlorocthane.(EDC)above the <br /> California Department of Health Services(DHS)recommended action level fordrinking wa:cr. <br /> GRUUND WATER SAMPLING <br /> Robert Kitay and John Duey,WA geologic technicians,collected ground water samples <br /> from monitoring wells MW-2, MW-4, MW-5, MW-6, and MW-7 on 16 and 19 December 1988. <br /> Monitoring wells MW-1 and MW-3 ware not sampled because there was insufficient water for <br /> sample collection. Prior to sampling,each well was purged of at least four wellbore volumes <br /> of water using dedicated bladder pumps or steam-cleaned teflon bailers. The pH,temperature, <br /> and specific conductance were measured after each wellbore volume until these parameters <br /> stabilized insuring that the samples collected were representative of the ground water in the <br /> water-bearing zone. The ground water samples were either decanted from the steam-cleaned <br /> teflon sampling bailers or vuntped into 40 mi glass volatile organic analysis(VOA) vials with <br /> teflon septa,preserved with sodium hydrogen sulfate and refrigerated for transport to Central <br /> Coast Analytical Services, Inc. of San Luis Obispo, California. A bailer blank was prepared <br /> by pouring deionized water into a clean teflon sampling bailer before sample collcction. The <br /> water was then decanted from the bailer into a 40 ml VOA vial, preserved, refrigerated and <br /> transported to the laboratory with the ground water samples. A travel blank of ecitified <br /> A Diurs,on o1 AguaTcrra Assoeiales Leeorpo aced - <br /> t <br />