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t <br /> t <br /> 3330 Data Drive <br /> �/. Delta sate 100 <br /> Cardona CA 95670 <br /> wronmental 916 <br /> En916 63 638 2085 <br /> Consultants,Inc FAX 916'638 8385 <br /> June 21, 1994 <br /> Ms Marla Guensler <br /> Exxon Company, U S A <br /> Post Office Box 4032 <br /> Concord, California 94524-2032 <br /> Subject Quarterly Ground Water Monitoring Report, Second Quarter 1994 <br /> Exxon Retail Station No 7-3708 <br /> 2705 Country CIub Boulevard <br /> Stockton, California <br /> Delta Project No D093-809 <br /> Dear Ms Guensler <br /> Delta Environmental Consultants, Inc. (Delta), has been authorized by Exxon Company, <br /> U S A (Exxon), to conduct quarterly ground water monitoring at Exxon Retail Station No 7-3708, <br /> . located at 2705 Country Club Boulevard, Stockton, California This letter report presents the results <br /> of quarterly ground water monitoring and sampling conducted on May 31, 1994 The location of the <br /> site is shown in Figure 1 and site features are illustrated in Figure 2 All work conducted at the site <br /> by Delta was performed in accordance with the field methods and procedures described in <br /> Enclosure A <br /> Ground Water Table Elevation, Flow Direction—and-Hydraulic Gradient <br /> Ground water table elevations were measured in each of the eight ground water monitoring wells at <br /> the site on May 31, 1994 Depths to ground water in the monitoring wells ranged from 10 31 to <br /> 13 06 feet below the tops of the well casings Ground water table elevations have increased <br /> approximately 0 85 feet since the previous monitoring event in February 1994 Ground water table <br /> measurements are presented in Table 1 A water table contour map constructed from the <br /> measurements recorded on May 31, 1994, is included as Figure 3 The water table contours indicate <br /> that ground water generally flowed toward the northeast with a hydraulic gradient of approximately <br /> 0 006, which is consistent with historical data <br /> Subjective-Analysis <br /> No liquid-phase petroleum hydrocarbons or hydrocarbon sheens were present in the wells during the <br /> May 1994 site visit <br /> Analytical Results <br /> Ground water samples collected from each of the eight monitoring wells on May 31, 1994, were <br /> submitted to a California-certified laboratory for analysis of benzene, toluene, ethylbenzene, total <br /> xylenes, and total petroleum hydrocarbons as gasoline Analytical test results are summarized in <br /> Table 2 Ground water samples collected from monitoring wells MW-2 and MW4 through MW-8 <br /> Delta Delivers Solutions <br />