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Working To Restore Nature <br /> f � <br /> 1710 Main Street Pacific Gas & Electric Company's <br /> Escalon, CA 95320 <br /> Phone (209) 838-3507 Tracy Service Center <br /> FAX (209) 838.3509 Fust Half 1994 <br /> ' Groundwater Sampling <br /> INTRODUCTION <br /> This report presents the results of the first half 1994 groundwater sampling conducted in the <br /> vicinity of the former underground fuel storage tank at Pacific Gas and Electric Company's <br /> (PG&E's) Tracy Service Center The service center is located at 502 East Grant Line Road in <br /> ' Tracy, California Field work for this portion of the investigation was performed on April 5, <br /> 1994. The purpose of the sampling program is to continue the evaluation of the groundwater <br /> ' quality near the site of the former underground fuel tank. <br /> IPSUNEWARY <br /> ' Static groundwater levels measured in monitoring wells OW-1 through OW-6 ranged from 7.34 <br /> to 8 07 feet below the tops of the well casings (Table 1). On April 5, 1994 the direction of the <br /> shallow groundwater flow in the vicinity of the former tank location was north-northeasterly, <br /> with a hydraulic gradient of 0.004 ft/ft (Figure 1). <br />� I <br /> ' Groundwater samples were collected from wells OW-2 and OW-6 and submitted to Sequoia <br /> Analytical (Redwood City, CA) for analysts of total petroleum hydrocarbons as gasoline (TPHG) <br /> ' and benzene, toluene, ethylbenzene, and xylenes (BTEX). The sample collected from well OW- <br /> 2 contained benzene (4.5 µg/P) and ethylbenzene (1.9 µg1 f) A blind duplicate sample of well <br /> OW-2 (labeled OW-7) was collected and the analytical results were consistent with the original <br /> sample. Benzene (4.0 jig/f) and ethylbenzene (1.7 µg/f) were reported. All analytes for the <br /> sample collected from well OW-6 were reported as non-detectable (below laboratory method <br /> QRTERLYI I QR-1994 FNL 1 <br /> I <br />