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FEB Z 3 '94 JAM. <br /> GROUNDWATER <br /> ❑❑ TECHNOLOGY INC. 1401 Halyard Drive,Suite 140 West Sacramento CA 9569 91fi 372-4700 <br /> 1.f <br /> FAX(916)372-8781 <br /> February 22, 1994 Project No. 02070 4238 <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 /> FORMER CHEVRON SERVICE STATION NO. 9-7780 <br /> 3246 EAST FREMONT 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 January 7, 1994. The eight monitoring <br /> wells were located and gauged, but only four wells, EA-5, EA-6, MWS, and MW-5, contained water. <br /> A potentiometric surface map (Figure 1) and a summary of groundwater monitoring data are <br /> included in Table 1. After measuring DTW, the four monitoring wells with water were 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 1. 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 /> 2— r <br /> BRUCE H. EPPLER E. K SIMONIS, R.G. <br /> Environmental Geologist Senior Environmenta c�oL <br /> Project ManageroC, <br /> PRQke, <br /> DSB/BHE/EKS:rz <br /> Attachments ,�,� N0 4422 <br /> 42=TFWLTR * + <br /> Offices throughout the U.S.,Canaria and Overseas ��'�� C'ALT FO�s <br />