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3330 Data Drive <br /> �/. Delta Suite 100 <br /> Rancho CCA 95670 <br /> En�eronmentai 9161638 2085085 <br /> Consultants,Inc. FAX 9161638 8385 <br /> March 18, 1994 <br /> Ms Marla Guensler <br /> Exxon Company, U S A <br /> Post Office Box 4032 <br /> Concord, California 94524-2032 <br /> v � r <br /> Subject Quarterly Ground Water Monitoring Report, First Quarter 1994 <br /> Exxon Retail Station No 7-3708 <br /> 2705 Country Club Boulevard <br /> Stockton, California-- <br /> Delta Project No 40-93-809 <br /> Dear Ms Guensler <br /> Delta Environmental Consultants, Inc (Delta), has been authorized by Exxon Company, <br /> U S A (Exxon), to conduct quarterly ground water monitoring at Exxon Retail Station No 7-3708, <br /> located at 2705 Country Club Boulevard, Stockton, Calitornia This letter report presents the results <br /> of quarterly ground water monitoring and sampling conducted on February 10. 1994 /The location <br /> of the site is shown in Figure 1 and site features are illustrated in Figure 2 All work conducted at <br /> the site by Delta was pertormed in accordance with the field methods and procedures described in <br /> Enclosure A <br /> Ground Water Table Elevation Flow Direction and Hydraulic Gradient <br /> Ground water table elevations were measured in each of the six ground water monitoring wells at the <br /> site on February 10, 1994 Depths to ground water in the monitoring wells ranged trom 11 20 to <br /> 13 86 feet below the tops of the well casings Ground water table elevations have increased <br /> approximately 1 foot since the previous monitoring event in November 1993 Ground water table <br /> measurements are presented in Table 1 A water table contour map constructed from the <br /> measurements recorded on February 10, 1994, is inc�.n`ded as Figure 3 The water table contours <br /> ndicate that ground water flowed toward the northeast with a hydraulic gradient of approximately <br /> //01001 Last quarter the ground water flow direction was toward the northwest <br /> Subjective Analysis <br /> No liquid-phase petroleum hydrocarbons or hydrocarbon sheens were present in the wells during the <br /> February 1994 site visit <br /> Analytical Results <br /> Ground water samples collected trom each of the six monitoring wells on February 10, 1994, were <br /> submitted to a Calitornia-certified laboratory for analysis of benzene, toluene, ethylbenzene, total <br /> xylenes (BTEX), and total petroleum hydrocarbons (TPH) as gasoline Analytical test results are <br /> summarized in Table 2 Ground water samples collected trom monitoring wells MW-2 and MW-4 <br /> Deita Delvers 5oiuticrs <br />