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440 West Charter Way, Stockton, California February 8, 1993 <br /> Texaco Environmental Services Page 2 <br /> cleaned with an industnal detergent and distilled water, was used for the groundwater sampling The <br /> water samples were then transferred to 40-milliliter glass vials with Teflon'-septum caps, preserved <br /> on ice, and transported to a California state-certified laboratory, accompanied by a chain-of-custody <br /> manifest <br /> The water samples were analyzed using modified EPA methods 5030/8020/8015, which measure <br /> concentrations of total petroleum hydrocarbons-as-gasoline (TPH-G), and benzene, toluene, <br /> ethylbenzene and xylenes (BTEX) Monitoring wells MW-6, MW-7, and MW-10 are additionally <br /> analyzed for fecal coliform biannually <br /> MW-1 was not sampled due to the presence of SP MW-7 did not have sufficient water to be <br /> sampled <br /> GROUNDWATER ANALYTICAL RESULTS <br /> Concentrations of TPH-G in the December 17, 1992 groundwater samples ranged from 450 parts per <br /> billion (ppb) to 340,000 ppb, benzene concentrations ranged from below the method detection lima <br /> (MDL) to 51,000 ppb (Figures 3 and 4) Analytical results including fecal coliform analyses are <br /> presented in Table 3 Copies of the laboratory analyses reports are presented in Attachment I <br /> Please contact Groundwater Technology's West Sacramento Office if you have questions or <br /> comments regarding this report <br /> Sincerely, <br /> Groundwater Technology, Inc Groundwater Technology, Inc. <br /> Written/Submitted by Revi5eWect9kpproved rb <br /> DANISE SCRIVEN BEGNAUDAMES W RA TY, R A <br /> Associate Geologist Environmental Geologirst <br /> Project Manager <br /> r <br /> �ERED GEpL <br /> tED) <br /> E K SIMONIS, R <br /> Senior Environme t LFeologist o <br /> DSB/JWG/EKS rb p _z <br /> Attachments No 4422 cl) <br /> 32940SR R4 <br /> cc D E Heinrich, Texaco Environmental Services <br /> cALrFaR <br /> GROUNDWATER <br /> TECHNOLOGY <br />