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3164 Gold Camp Drive <br /> Suite 200 <br /> Delta <br /> #R/Al, <br /> Rancho Cordova CA 95670-6021 <br /> Environmental U S A <br /> Consultants,Inc 916/638-2085 <br /> r-AX 9161638 8385 <br /> April 19, 1999 <br /> Mr Dann Rouse <br /> Exxon Company, U S A <br /> 2300 Clayton Road, Suite 1250 <br /> Concord, California 94520 <br /> Subject Quarterly Ground Water Monitoring Report, First Quarter 1999 <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 CIub Boulevard, Stockton, California The location of the site is shown in Figure I 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 first quarter 1999 <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 March 5, 1999, ground water measurements were recorded in monitoring wells MW-1 through <br /> MW-8, and vapor extraction wells VEW-1, and VEW-3 Depth to ground water in the wells ranged <br /> from 5 33 (MW-5) to 8 67(MW-7) feet below the top of the well casings Ground water elevations <br /> have increased an average of 141 feet since the previous monitoring event conducted on <br /> December 16, 1998 Cumulative ground water elevation measurements are presented in Table I <br /> A ground water elevation contour map, constructed from the ground water elevations recorded on <br /> March 5, 1999, from MW-I through MW-8 is included as Figure 3 Based on the ground water <br /> elevation contours, the ground water flow direction was generally to the south-southeast across the site, <br /> with a hydraulic gradient of approximately 0 004 <br /> Subjective Ang!ysis <br /> Liquid-phase petroleum hydrocarbons were not observed in any of the monitoring wells during the first <br /> quarter 1999 site visit <br /> Providing a Competitive Edge <br />