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C <br /> WEISS ASSOCIATES Consulting In Geology G Geohydrology <br /> ¢` 29:38 McClure Street, Oakland, Cil 94609 415.46.5-1100 <br /> ff.fi.F!• <br /> November 14, 1989 <br /> John Randall <br /> Chevron USA <br /> P.O. Bax 5004 <br /> San Ramon, CA 94583-0804 <br /> Re- Chevron Service Station #91465 <br /> 5608 North Pershing Avenue <br /> Stockton,California <br /> WA Job #4-305-01 <br /> Dear Mr. Randall. <br /> Weiss Associates(WA) collected ground water samples from two monitoring wells on <br /> October 5, 1989 as part of the quarterly ground waWr monitoring program at Chevron Service <br /> �v Station #96465 in Stockton,California(Figure I).Ground water samples from monitoring well is <br /> MW-2(Figure 2)contained aromatic hydrocarbons(513TX)at historically high concentrations <br /> and total purgable petroleum hydrocarbons (TPPH) at concentrations comparable to <br /> historicaliy high concentraticns detected in July 1989.Five monitoring wells were not sampled <br /> because they contained insufficient water. <br /> GROUND WATER SAMPLING <br /> On October 5, 198:, WA Environmental Technician Eric Anderson measured water <br /> levels in all seven monitoring wells and attempted to collect ground water samples. Monitoring ' t4.' <br /> wells MW-2 and lAW-5 were purged dry using steam-cleaned PVC bailers after evacuating 0.2 v <br /> and 3.8 gallons of water,respectively.Wells MW-2 and MW-5 were sampled with ;team-cleaned s <br /> Teflon bailers after the wells had recovered to about 60 and 98 percent of their respective <br /> static water levels- Monitoring wells MW-1, MW-3, MW-4, MW-6 and MW-7 were purged dry <br /> but were not sampled because water le•els did not recover sufficiently. <br /> RF ENE. <br /> . . DEC <br /> ENVIROiVMEN'fAL HEALTH <br /> PERM!?'/SE=RVICES <br /> A Division of AguaTierra Associates lncerporafed <br />