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. SData Drive Suit Delta Suite ,dd �/. Rancho Cordova CA 95674 Environmental 9161538 2085 Consultants,Inc. SLI -8385 X� June 8, 1995 4n�(t�r lvIL I_ !l '1JJ Ms Marla Guensler NVIRONIMENIA 'HFALI3 PERMIT ISFR\ ICFS Exxon Company, U S A 2300 Clayton Road, Suite 1250 Concord, California 94520 Subject Quarterly Ground Water Monitoring Report, Second Quarter 1995 Exxon Retail Station No 7-3708 2705 Country Club Boulevard Stockton, California Delta Project No D093-809 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 former 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 April 5, 1995 The location of the site is shown in Figure 1 and site features are illustrated in Figure 2 The 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 eight ground water monitoring wells at the site on April 5, 1995 Depths to ground water in the monitoring wells ranged from 7 14 to 9 98 feet below the tops of the well casings Ground water table elevations have increased approximately 4 3 feet since the previous monitoring event in January 1995 Cumulative ground water table measurements are presented in Table 1 A water table contour map constructed from the measurements recorded on April 5, 1995, is included as Figure 3 The water table contours indicate that ground water in the southwest area of the site generally flowed toward the northeast with a hydraulic gradient of approximately 0 005, which is consistent with the previous quarter data Subjective Analysis No liquid-phase petroleum hydrocarbons or hydrocarbon sheens were present in the wells during the April 1995 site visit Analytical Results Ground water samples collected from each of the eight monitoring wells on April 5, 1995, were submitted to Sequoia Analytical (Sequoia) (a California-certified laboratory) for analysis of benzene, toluene, ethylbenzene, total xylenes (BTEX), and total petroleum hydrocarbons (TPH) as gasoline using EPA Methods 602 and 8015 Modified, respectively Analytical test results are summarized in Providing a Competitive Edge