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I1y 1 l !z ENVIRONMENTAL fH.EALTh 3330 Data Drive PERMIT SOERYIniE Suite 100 Delta Rancho Cordova.CA 95670 Environmental NOY P � " 916/638-2085 Consultants,Inc. FAX: 9161638-8385 October 17, 1994 Ms. Marla Guensler Exxon Company, U.S.A. Post Office Box 4032 Concord, California 94524-2032 Subject: Quarterly Ground Water Monitoring Report, Third Quarter 1994 �q Exxon Retail Station No. 7-3330 3128 West Benjamin Holt Drive Stockton, California Delta Project No. D093-810 Dear Ms. Guensler: Delta Environmental Consultants, Inc. (Delta), has been authorized by Exxon Company, U.S.A. (Exxon), to conduct quarterly ground water monitoring at Exxon Retail Station No. 7-3 330, located at 3128 West Benjamin Holt Drive, Stockton, California. This letter report presents the . results of quarterly ground water monitoring and sampling conducted on August 30, 1994. The location of the site is shown in Figure 1 and site features are illustrated in Figure 2. All work conducted at the site by Delta was performed in accordance with the field methods and procedures described in Enclosure A. Ground Water Table Elevations Flow Direction and Hvdraulic Gradient Ground water table elevations were measured in each of the four existing monitoring wells at the site on August 30, 1994. Depths to ground water in the monitoring wells ranged from 12.74 to 13.14 feet below the tops of the well casings. Ground water table measurements are presented in Table 1. A water table contour map constructed from the ground water table elevations recorded on August 30, 1994, is included as Figure 3. The water table contours illustrated in Figure 3 indicate that ground water flowed toward the northeast with a hydraulic gradient of approximately 0.002.1--l- Subjective .002.✓Subjective Analysis No liquid-phase petroleum hydrocarbons or hydrocarbon sheens were present in the wells during the August 1994 site visit. Analytical Results Ground water samples collected from monitoring wells MW-3, MW-4, MW-5, and MW-6, on August 30, 1994, were submitted to a California-certified laboratory for analysis of benzene, toluene, ethylbenzene, total xylenes, and total petroleum hydrocarbons as gasoline. Analytical test results are summarized in Table 2. None of the ground water samples collected from any of the monitoring wells contained detectable concentrations of petroleum hydrocarbons. Copies of the laboratory analytical reports are presented in Enclosure B. Providing a Competitive Edge