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LW GROUNDWATER <br /> TECHNOLOGY, INC <br /> 1401!-Ealyarc!Drive,Suite 140,West Sacramento,CA 95691.(916)3724700 <br /> FAX(916)372-8781 <br /> June 25, 1993 Project No. 02070 3983 <br /> Mr. Brett 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. 9-0557 <br /> 139 SOUTH CENTER STREET <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 site on May 17, 1993. The five site-related <br /> groundwater monitoring wells were gauged to determine depth to groundwater (DTW) and to check <br /> for the presence of separate-phase petroleum hydrocarbons. A potentiometric surface map <br /> (Figure 1) and a summary of groundwater monitoring data (fable 1) are included. After measuring <br /> DTW, each monitoring well was purged and sampled. The groundwater samples were analyzed for <br /> dissolved benzene, toluene, ethylbenzene and xylenes (BTEX), and total petroleum hydrocarbons-as- <br /> gasoline (fPH-G). At the request of San Joaquin County Department of Environmental Health, MW-1 <br /> and MW-2 were sampled for f=ecal coliform. Results of the laboratory analyses are summarized in <br /> Table 1. Laboratory reports and chain-of-custody manifests are included in Attachment 1. All purge <br /> water generated during the sampling process was collected in a Department of Transportation <br /> (DOT)-approved purge water trailer and transported for recycling to the Chevron refinery in <br /> 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 /> _ZL=='gv C::�'- - <br /> BRUCE H. EPPLER E.K. SIMONIS, R.G. n c <br /> Environmental Geologist Senior EnvironmenR <br /> ggist�°' <br /> Project Managers' <br /> PR j <br /> DSB/BHE/EKS:rb <br /> Enclosure No. 4422 <br /> 38830TR2_LTR <br /> Offices throughout the U.S..Canada and Overseas <br />