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3164 Gold Camp ]rive <br /> SuitDelta Ran z°° <br /> �/. Rancho Cordova CA 95070 <br /> Environmental 916.638-2065 <br /> Consultants,Inc FAX 916,638-8385 <br /> August 16, 1995 <br /> Ms Marla Guensler <br /> Exxon Company, U S A. <br /> 2300 Clayton Road, Suite 1250 <br /> Concord, California 94520 <br /> Subject Quarterly Ground Water Monitoring Report, Third Quarter 1995 <br /> Exxon Service Station No 7-3708 <br /> 2705 Country Club 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 former Exxon Service Station <br /> No 7-3708, located at 2705 Country Club Boulevard, Stockton, California This letter report <br /> presents the results of quarterly ground water monitoring and sampling conducted on July 14 and <br /> July 17, 1995 The location of the site is shown in Figure 1 and site features are illustrated in <br /> Figure 2 The work conducted at the site by Delta was performed in accordance with the field <br /> methods and procedures described in Enclosure A. <br /> Ground Water Table Elevation Flow Direction and H draulic Gradient <br /> Depth to ground water was measured in each of the eight ground water monitoring wells at the site <br /> on July 14 and 17, 1995. The depth to ground water measurements recorded on July 14, 1995 (the <br /> day the wells were sampled) were not used to calculate ground water table elevations due to <br /> anomalous data Depth to ground water in the monitoring wells on July 17, 1995, ranged from 9 09 <br /> to 11 82 feet below the tops of the well casings. Ground water table elevations have decreased <br /> approximately 2 feet since the previous monitoring event in April 1995 Cumulative ground water <br /> table measurements are presented In Table 1. A water table contour map constructed from the <br /> measurements recorded on July 17, 1995, is included as Figure 3 The water table contours indicate <br /> a slight mound in the water table m the vicinity of monitoring well MW-4, however, ground water <br /> in the area of the site generally flowed toward the northeast and east with a hydraulic gradient of <br /> approximately 0 007, which is consistent with previous data. <br /> Subjective Analysis <br /> No liquid-please petroleum hydrocarbons or hydrocarbon sheens were present in the wells during the <br /> July 1995 site visit <br /> Providing a Competitive Edge <br />