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Upp— — -- — <br /> ��i► Delta <br /> Environmental <br /> Consultants,Inc AX <br /> Ma` 8 1999 <br /> ills Marla D Guensler ls�l <br /> Etixon Company, U S A <br /> 2300 Clayton Road, Sultc, 640 <br /> Concord, California 9420 <br /> Subject Quarterly Grouncl Water iWonitoring.Report first Quarte; 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 Lnvironmcmtal Consultants, Inc (Delta), has been authonzcd by Ekon Company, U S A <br /> (Exxon), to conduct quarterly ground watc,r monitoring at Exxon Semce Station No 7-3708 located at <br /> 2705 Country Club Boulevard, Stockton, California The location oftlle site is shown in Figure 1 and <br /> site features arc, illustrated rn Figure, 2 The quarterly monitoring program is intended to monitor the <br /> distrnb ution of dissolved petroleum lid drocarbon constituents in ground water at the site. <br /> This report presents the results of quarterly monitoring activities conducted during the first 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 March 30, 1998, ground water measurements were recorded to monitoring wells MW-1 through <br /> MW-8 Depth to ground water m the wells ranged from 4 68 (MW-7) to 6 18 (MW-8) feet below the <br /> top of the well casings Ground water elevations have increased an average of 4 4 feet since the <br /> previous monitoring event conducted on November 24, 1997 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 /> March 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 0I <br /> Subjective Analysis <br /> Liquid-phase petroleum hydrocarbons were not observed In any of the monitoring wells during the first <br /> quarter 1998 site visit <br /> Providing a Competitive Edge <br />