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t< <br /> 9 4etr 3330 Data Drive <br /> Suite 100 <br /> �/ Delta F E B 0 8 ,113 Rancho Cordova CA 95670 <br /> Enwronmen#a 1 l, `� C i j 916 638 2085 <br /> Consultants,Inc fis 1 FAX 9161638 8385 <br /> January 13, 1993 <br /> Ms Marla Guensler <br /> Marketing Division <br /> Exxon Company U S A <br /> 2300 Clayton Road, Suite 1250 <br /> Concord, California 94520 <br /> Subject Quarterly Monitoring Report, Fourth Quarter 1992 <br /> Exxon Station RIS No 7-3708 <br /> 2705 Country Club Boulevard, Stockton, California <br /> Delta Project No 40-91-838 <br /> Agency Due Date: 1115193 <br /> Dear Ms Guensler <br /> Delta Environmental Consultants, Inc (Delta), has been authorized by Exxon Company U S A <br /> (Exxon), to conduct quarterly monitoring at the Exxon service station located at 2705 Country Club <br /> Boulevard, Stockton, California (Figure 1) This letter report contains the latest quarterly ground <br /> water analytical results and water level data for this site Ground water samples and water level <br /> measurements were collected from three on-site monitoring wells (MW-1, MW-2, and MW-3) and <br /> three off-site monitoring wells (MW-4, MW-5, and MW-6) on December 18, 1992 Monitoring <br /> wells and facility locations are illustrated in Figure 2 All field activities were conducted using <br /> procedures described in Enclosure A <br /> Ground water table levels measured in the monitoring wells MW-1 through MW-6 since <br /> August 23, 1991, are compiled in Table 1 Depth to ground water measured on December 18, 1992, <br /> ranged from 14 45 to 17 04 feet below the tops of the well casings Ground water level <br /> measurements collected on December 18, 1992, were used to constrict a water table contour map, <br /> included as Figure 3 As indicated in Figure 3, the inferred direction of ground water flow across <br /> the site is to the northeast with a gradient of approximately 0 002 <br /> Delta Delivers Solutions <br />