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.,Toil old 1�� -)r3rr , r <br /> Delta Sut <br /> sie <br /> Rancho Cor1k n021 <br /> Enveronmental U S A <br /> Consultants,Inc 916!638 --085 <br /> FAX 9161638 �JB� <br /> August 3 1998 <br /> 00 <br /> Ms Marla D Guensler <br /> Exxon Company, U S A /" <br /> 2300 Clayton Road, Suite 640 <br /> Concord California 94520 <br /> Subject Quarterly Ground Water Monitoring Report, .Second 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 Ms Guensler <br /> Delta Environmental Consultants, Inc (Delta), has been authorized by Exxon Company, U S A <br /> (Exton), to conduct quarterly ground water monitoring at Exxon Service Station No 7-3708 located at <br /> 2705 Country Club BOuILVard, Stockton California The location of the site is shown in Figure 1 and <br /> NM, features are illustrated in Figure 2 The quarteriv monitoring program is intended to monitor the <br /> distribution of dissolved petroleum hydrocarbon constituents in ground water at the site <br /> This r�,port presents the results of quarterly monitoring activities conducted durmg the second quarter <br /> 1998 These activities included ground water elevation measurements and the collection of ground <br /> water samples for chemical analyses of petroleum hydrocarbon constituents Field work conducted at <br /> the site 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 June 30, 1998, ground water measurements were recorded in monitoring wells MW-1 through <br /> MW-8 Depth to ground water in the wells ranged from 6 05 (MW-5) to 8 85 (MW-2) feet below the <br /> top of the well casings Ground water elevations have increased an average of 1 5 feet since the <br /> previous monitoring event conducted on March 30, 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 /> June 30, 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 /> Subjective Analysis <br /> Liquid-phase petroleum hydrocarbons were not observed in any of the monitoring wells during the <br /> second quarter 1998 site visit <br /> Providing a Competitive Edge <br />