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u <br /> � GROUNDWATER <br /> ❑ ! TECHNOLOGY, INC. 1401 Halyard Drive,Suite 140,West Sacramento,CA 35691.(916)372-4700 <br /> FAX(916)372-8781 <br /> September 3, 1992 Project No. 02030 1653 <br /> Mr. Clint B. Rogers <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. Rogers: <br /> Groundwater Technology, Inc. submits this letter as a summary of quarterly groundwater <br /> monitoring and sampling data collected on July 10, 1992 at the above-referenced site. The <br /> four groundwater monitoring wells were gauged to determine depth to groundwater (DTW) and <br /> to check for the presence of separate-phase petroleum hydrocarbons. A potentiometric surface <br /> map (Figure 1) and a summary of groundwater monitoring data (Table 1) are included. After <br /> measuring DTW, each monitoring well was purged and sampled. The groundwater samples <br /> were analyzed for dissolved benzene, toluene, ethylbenzene and xylenes (BTEX), and total <br /> petroleum hydrocarbons-as-gasoline (TPH-G). In addition, groundwater samples from <br /> monitoring wells MW-1 and MW-2 were analyzed for fecal coliform. Results of the chemical <br /> analyses are summarized in Table 1 . Laboratory reports and chain-of-custody manifests are <br /> included in Attachment A. All purge water generated during the sampling process was <br /> collected in a Department of Transportation (DOT)-approved purge water trailer and transported <br /> for recycling to 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 mitted by Reviewed/Approved by <br /> r <br /> ��EftED <br /> AMES W. GRASTY, R. .A. ,GOQ,S k_D) IMONIS, R.G. <br /> • Environmental GeologiK io Environmental Geologist <br /> Project Manager Z <br /> JWG/EKS:rc � <br /> No. 4422 c4l <br /> Enclos;.re �a �• <br /> I8630TR21TR <br /> � �F CA'bl <br /> Offices throughout the U.S.,Cana no Overseas <br />