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JAN 11'94 LM M., <br /> ❑ GROUNDWATER <br /> ❑❑ TECHNOLOGY, INC. 1401 H alyard Dnve Suite 140 West Sacramento CA 95691 (916)372-4700 <br /> FAX(916)372-8781 <br /> January 7, 1994 Project No 02070 4236 <br /> Mr Brett L Hunter <br /> Chevron U S A Products Company <br /> 2410 Camino Ramon <br /> San Ramon, CA 94583-0804 <br /> RE: QUARTERLY MONITORING AND SAMPLING ACTIVITIES <br /> CHEVRON SERVICE STATION NO 9-4275 <br /> 2905 WEST BENJAMIN HOLT DRIVE <br /> STOCKTON, CALIFORNIA <br /> Dear Mr Hunter <br /> Groundwater Technology, Inc submits this letter as a summary of quarterly groundwater monitoring <br /> and sampling data collected at the above-referenced s[te on November 9, 1993 The seven <br /> site-related groundwater monitoring wells were gauged to determine depth to groundwater (DTW) <br /> and to check for the presence of separate-phase petroleum hydrocarbons In response to a request <br /> from San Joaquin County Environmental Health Department, groundwater monitoring was <br /> coordinated with the consultant for the adjacent ARCO site (Brown & Caldwell) A potentiometric <br /> surface map which includes the ARCO groundwater data (Figure 1) and a summary of groundwater <br /> monitoring data (Cable 1) are included After measuring DTW, each monitoring well was purged and <br /> sampled The groundwater samples were analyzed for dissolved benzene, toluene, ethylbenzene <br />/ and xylenes (BTEX), and total petroleum hydrocarbons-as-gasoline (TPH-G) Results of the chemical <br /> analyses are summarized in Table 1 Laboratory reports and chain-of-custody manifests are <br /> included in Attachment I All purge water generated during the sampling process was collected in a <br /> Department of Transportation (DOT)-approved purge water trailer and transported for recycling to <br /> the Chevron refinery in Richmond, California <br /> Groundwater Technology, Inc is pleased to assist Chevron on this project If you have any <br /> questions or comments please call our West Sacramento office <br /> Sincerely, <br /> Groundwater Technology, Inc Groundwater Technology, Inc <br /> Written/Submitted by Reviewed/Approved by <br /> Z <br /> BRUCE H EPPLER E K SIMONIS, R G <br /> Environmental Geologist Senior Environ D GE Co <br /> Project Manager G Piot kcr� <br /> N <br /> PR <br /> Qo sc <br /> ©S /BHE/EKS rz <br /> Attachments No 4422 <br /> 42364TR4 LTR <br /> Offices lhroughouf the 1,1S Canada and Overseas � 'QjC CA b f <br />