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3164 Gout Carie L i"r <br /> SuiteDelta Rancho 200 <br /> ho Cordova CA 95670 6021 <br /> Environmental U S A <br /> Consultants,Inc 916/638 2085 <br /> FAX 916638 8385 <br /> January 28, 1999 <br /> ystv I �f J,, <br /> v [ <br /> Mr Darin Rouse FES - s 1999 <br /> Exxon Company, U S A <br /> 2300 Clayton Road, Suite 1250 MVIRONMENTAL HEALTH <br /> Concord, California 94520 PERMIT/SERVICES <br /> Subject Quarterly Ground Water Monitoring Report, Fourth Quarter 1998 <br /> Former Exxon Service Station No 7-3708 <br /> 2705 Country Club Boulevard <br /> Stockton, California <br /> Delta Project No D093-809 <br /> Dear Mr Rouse <br /> Delta Environmental Consultants, Inc (Delta), has been authorized by Exxon Company, U S A <br /> (Exxon), to conduct quarterly ground water monitoring at Exxon Service Station No 7-3708 located at <br />• 2705 Country Club Boulevard, Stockton, California The location of the site is shown in Figure l and <br /> site features are illustrated in Figure 2 The quarterly monitoring program is intended to monitor the <br /> distribution of dissolved petroleum hydrocarbon constituents in ground water at the site <br /> This report presents the results of quarterly monitoring activities conducted during fourth quarter 1998 <br /> These activities included ground water elevation measurements and the collection of ground water <br /> samples for chemical analyses of petroleum hydrocarbon constituents Field work conducted at the site <br /> was performed in accordance with the field methods and procedures presented in Enclosure A <br /> Ground Water Elevation_Measurements, Flow Direction, and Hydraulic_Gradient <br /> On December 16, 1998, ground water measurements were recorded in monitoring we1ls MW-1 through <br /> N fW-8 Depth to ground water in the wells ranged from 7 07 (MW-5) to 9 74 (MW-2) feet below the <br /> top of the well casings Ground water elevations have increased an average of 0 54 feet since the <br /> previous monitoring event conducted on October 5, 1998 Cumulative ground water elevation <br /> measurements are presented in Table 1 <br /> A ground water elevation contour map, constructed from the ground water elevations recorded on <br /> December 16, 1998, is included as Figure 3 Based on the ground water elevation contours, the ground <br /> water flow direction was generally to the northeast, across the site, with an average hydraulic gradient <br /> of less than 0 01 <br /> Subiective Analysis <br /> Liquid-phase petroleum hydrocarbons were not observed in any of the monitoring wells during the <br /> fourth quarter 1998 site visit <br /> Providing a Competitive Edge <br />