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3330 Data Drrve <br /> Delta <br /> Suite 100 <br /> //. Rancho Cordova CA 95679 <br /> Environmental 916 638 2085 <br /> Consultants,Inc FAX 916 638 8385 <br /> October 14, 1992 <br /> Ms Marla Guensler <br /> Marketing Division <br /> Exxon Company U S A O C T <br /> 2300 Clayton Road, Suite 1250 <br /> Concord, California 94520 1 <br /> ( k r <br /> Subject Quarterly Monitoring Report, Third Quarter of 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: 10/15/92 <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 September 28, 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 September 28, 1992, <br /> ranged from 14 68 to 17 28 feet below grade The elevations of the monitoring wells were surveyed <br /> using a California Department of Transportation bench mark (No 1618L) which has an elevation of <br /> 0 728 feet above mean sea level Ground water level measurements collected on <br /> September 28, 1992, indicate the direction of ground water flow across the site is to the northeast <br /> with a gradient of approximately 0 042 (Figure 3) <br /> Delta Delivers Solutions <br />