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i 3330 Data Drive Delta Ran 100 r 0 Cordova CA 95670 . Environmental r'i� r f" ? 916 916 6 638 2085 Consultants,Inc. FAX 916 638-8385 October 22, 1993 Ms Marla GuensIer Exxon Company, U S A Post Office Box 4032 Concord, California 94524-2032 Subject Quarterly Ground Water Monitoring Report, Third Quarter 1993 Exxon Retail Station No 7-3708 2705 Country Club Boulevard Stockton, California Delta Protect No 40-93-809 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 7-3708, located at 2705 Country Club Boulevard, Stockton, California This letter report presents the results of quarterly ground water monitoring and sampling conducted on September 23, 1993 The location of the site is shown in Figure I 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 Elevation, Flow Direction, and Hydraulic Gradient Ground water table elevations were measured in each of the six ground water monitoring wells at the site on September 23, 1993 Depths to ground water in the monitoring wells ranged from 1150 to 14 38 feet below the tops of the well casings Ground water table elevations have decreased approximately 3 feet since the previous monitoring event in April 1993 Ground water table measurements are presented in Table 1 A water table contour map constructed from the ground water elevations recorded on September 23, 1993, is included as Figure 3 The water table contours illustrated in Figure 3 indicate that ground water flowed toward the northwest with a hydraulic gradient of approximately 0 002, which is consistent with previous data Subieetive Analysis No liquid-phase petroleum hydrocarbons or hydrocarbon sheens were present in the wells during the September 1993 site visit Analytical Results Ground water samples collected from each of the six monitoring wells on September 23, 1993, were submitted to a California-certified laboratory for analysis of benzene, toluene, ethylbenzene, total xylenes (BTEX), and total petroleum hydrocarbons (TPH) as gasoline Analytical test results are summarized in Table 2 Ground water samples collected from monitoring wells MW-5 and MW-6 Delta Delivers Solutions