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� GROUNDWATER <br /> DEl ElTECHNOLOGY, INC. 1401 Halyard Drive,Suite 140,West Sacramento,CA 9569L(916)372-4700 <br /> FAX(916)372-8781 <br /> May 14, 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 April 3, 1992 at the above referenced site. The four <br /> groundwater monitoring wells were gauged to determine depth to groundwater (DTW) and to <br /> check for the presence of separate-phase petroleum hydrocarbons. A potentiometric surface map <br /> (Figure 1) and a summary of groundwater monitoring data (Table 1) are included. After measuring <br /> DTW, each monitoring well was purged and sampled. The groundwater samples were analyzed <br /> for dissolved benzene, toluene, ethylbenzene and xylenes (BTEX), and total petroleum <br /> hydrocarbons-as-gasoline (TPH-G). In addition, groundwater samples from monitoring wells MW-1 <br /> and MW-2 were analyzed for fecal coliform. Results of the chemical analyses are summarized in <br /> Table 1 . Laboratory reports and chain-of-custody manifests are included in Attachment A. All <br /> purge water generated during the sampling process was collected in a Department of <br /> Transportation (DOT)-approved purge water trailer and transported for recycling to the Chevron <br /> 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 /> GROU WATER TECHNjQL0GY, INC. <br /> l <br /> JAMES W. GRASTY E. K. SIMONIS, R.G. ,r•� tZ�:F3� <br /> Environmental Geologist Senior Environment • ca�g��k 5� r <br /> Projec <br /> ger <br /> JWG/EKS:rc � " <br /> No. 4422 <br /> Enclosures <br /> 1$53QTFt2.LTR <br /> Lp <br /> Offices throughout the U.S..Canada and Overseas �' `�'� <br />