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{ <br /> 3164 Gold Camp Drive <br /> Suite 200 <br /> Delta Rancho Cordova CA 95670 6021 <br /> USA <br /> Environmental 9161638 2085 <br /> Consultants,Inc FAX 9161638 8385 <br /> June 22, 1999 <br /> N r 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, Second 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 watCamfornoa monitoring <br /> location Service <br /> f hesite��nNo shown m Figure 1 and <br /> 08 located at <br /> 2705 Country Club Boulevard, Stockton, <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 second quarter 1999 <br /> These activities included ground water elevation measurements and the collection of ground water <br /> samples for chemical analyses of petroleum methods rbon constituents Field work conducted and procedures presented m Enclosure A at the site <br /> ' was performed in accordance with the <br /> Ground Water Elevation Measurements Flow Direction and Hydraulic Gradient <br /> ' ground water measurements were recorded in monitoring wells MW-1 through <br /> Cm May 14, 1999, gr 2 feet below the <br /> �_g Depth to ground waterin <br /> atewells <br /> elevations have deged from 5 creased sed an to <br /> of 0 32 feet since the <br /> ' <br /> top of the well casings Gr <br /> previous monitoring event conducted on March 5, 1999 Cumulative ground water elevation <br /> measurements are presented in Table 1 <br /> ' elevation contour map, constructed from the ground water elevations recorded on <br /> A ground water <br /> May 14, 1999, from MW-1 through M echonis cwuasegenerallyto the nod as Figure 3 artheast east across the sites <br /> ' elevation contours, the ground water flow <br /> with a hydraulic gradient of approximately 0 005 <br /> ' Sul7'ective Analysis <br /> t observed in any of the monitoring wells during the <br /> Liquid-phase petroleum hydrocarbons were no <br /> second quarter 1999 site visit. <br /> Providing a Competitive Edge <br />