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3164 Gold Camp Drive Delta Suite Ranchoo Cordova. CA 95670 Environmental 916/638-2085 Consultants,Inc. FAX: 9161638-8385 December 11, 1995 Ms. Marla Guenter Exxon Company, U.S.A. 2300 Clayton Road, Suite 490 Concord, California 94520 Subject: Quarterly Ground Water Monitoring Report, Fourth Quarter 1995 Exxon Service 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 Service Station No. 7-3330, . located at 3128 West Benjamin Holt Drive, Stockton, California. This letter report presents the results of quarterly ground water monitoring and sampling conducted on November 21, 1995. The location of the site is shown on Figure 1 and site features are illustrated on 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 Hydraulic Gradient Depth to ground water was measured in monitoring wells MW-3 through MW-6 on November 21, 1995. Measured depths to ground water ranged from 11.93 to 12.32 feet below the tops of the well casings at the site on November 21, 1995. Cumulative ground water table measurements are presented in Table 1. A water table contour map constructed from the ground water table measurements recorded on November 21, 1995, 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 <0.01, which is consistent with the historical ground water flow direction. Subjective Analysis No liquid-phase petroleum hydrocarbons or hydrocarbon sheens were present in the wells during the November 21, 1995, site visit. Providing a Competitive Edge