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t <br /> MAR 17 '93j.M.M. <br /> CIDGROUNDWATER <br /> TECHNOLOGY, I C. 1401 Halyard Drive,Suite 140,West Sacramento,CA 95691,(916)3724700 <br /> FAX(916)372-8781 <br /> March 12, 1993 Project No. 02030 1653 <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 February 16, 1993. The five <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 (Figure <br /> 1) and a summary of groundwater monitoring data (fable 1) are included. After measuring DTW, <br /> 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 (TPH-G). At the request of San Joaquin County Department of Environmental Health, MW-1 <br /> and MW-2 were sampled for Fecal 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 />{ <br /> BRUCE H. EPPLER E.K. SIMONIS, R.G. <br /> D C:E <br /> Environmental Geologist Senior Environmenta1E <br /> G` EDS 0 <br /> ^Project Manager �,�aQS k s�N� <br /> vu95/BHE/EKS:rb � <br /> Enclosure <br /> � cn <br /> 16530TR1.LTR No.4422 <br /> Offices ihroughout the U.S..Canada and Overseas CAIJt <br />