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"� <br /> Working To Restore Nature___ <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> ' Phone (209) 838-3507 <br /> FAX (209) 838-3509 <br /> 1 PACIFIC GAS & ELECTRIC COMPANY'S <br /> TRACY SERVICE CENTER <br /> ' THIRD QUARTER 1994 <br /> GROUNDWATER MONITORING <br /> AND SAMPLING REPORT <br /> 1 <br /> INTRODUCTION <br /> This report presents the results of the third quarter 1994 groundwater monitoring and sampling <br /> conducted in the vicinity of the former underground fuel storage tank at Pacific Gas and <br /> Electric Company's (PG&E's) Tracy Service Center The service center is located at 502 East <br /> Grant Line Road in Tracy, California Field work for this portion of the investigation was <br /> ' performed on September 29, 1994 The purpose of the sampling program is to continue the <br /> evaluation of the groundwater quality near the site of the former underground fuel tank <br /> SUMMARY <br /> Static groundwater levels measured in monitoring wells OW-1 through OW-6 ranged from <br /> 8 20 to 8 90 feet below the tops of the well casings (Table 1) On September 29, 1994 the <br /> direction of the shallow groundwater flow in the vicinity of the former tank location was <br /> northeasterly, with a hydraulic gradient of 0 003ft/ft (Figure 1) <br /> ' Groundwater samples were collected from wells OW-1, OW-2, OW-3, OW-4, OW-5 and <br /> ' OW-6 and submitted to Sequoia Analytical (Redwood City, CA) for analysis of total petroleum <br /> hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, and xylenes (BTEX) The <br /> sample collected from well OW-2 contained benzene (1 6 ug/1), toluene (0 80 ug/1), and <br /> ethylbenzene (0 53 ug/1). A blind duplicate sample of well OW-2 (labeled OW-7) was <br /> collected and the analytical results were consistent with the original sample. Benzene (2 6 <br /> ug/1), toluene (1 3 ug/1), and ethylbenzene (0 88 mg/1) were reported in the blind duplicate <br /> ' 1599061QRTERLY13QR-1994 doc 1 <br />