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f <br /> D 3330 Data Dnve <br /> DeltaRECEIVSate °° <br /> Envi �/ Rancna Cordova CA 95670 <br /> 2085 <br /> Consultants,Inc ��4 FAX13 1993 91669816 638 8385 <br /> F.NvRONMENTAL PERMIT/SE -HEALTH <br /> May 4, 1993 � ��� <br /> Ms Marla Guensler <br /> Exxon Company, U S A <br /> Post Office Box 4032 <br /> Concord, California 94524-2032 <br /> Subject Quarterly Ground Water Monitoring Report, First Quarter 1993 <br /> Exxon Retail Station No 7-3708 <br /> 2705 Country Club Boulevard <br /> Stockton, California <br /> Delta Project No 40-93-809 <br /> Agency Due Date: May 15, 1993 <br /> Dear Ms Guenter <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, California This letter report presents the results <br /> of quarterly ground water monitoring and sampling conducted on April 5, 1993 The location of the <br /> site is shown in Figure 1 and site features are illustrated in Figure 2 All work conducted at the site <br /> by Delta was performed 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 April 5, 1993 Depths to ground water in the monitoring wells ranged from 8 20 to <br /> 10 87 feet below the tops of the well casings Ground water table elevations have increased <br /> approximately 6 feet since the previous monitoring event in December 1992 Ground water table <br /> measurements are presented in Table 1 A water table contour map constructed from the ground <br /> water elevations recorded on April 5, 1993, is included as Figure 3 The water table contours <br /> illustrated in Figure 3 indicate that ground water flowed toward the northeast with a hydraulic <br /> gradient of approximately 0 002, which is consistent with previous data <br /> Subjective Analysis <br /> No liquid-phase petroleum hydrocarbons or hydrocarbon sheens were present in the wells during the <br /> April 1993 site visit <br /> Analytical Results <br /> Ground water samples collected from each of the six monitoring wells on April 5, 1993, were <br /> submitted to a California-certified laboratory for analysis of benzene, toluene, ethylbenzene, and total <br /> xylenes (BTEX), and total petroleum hydrocarbons as gasoline (TPHg) Analytical test results are <br /> Delta Delivers Solutions <br />