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1 <br /> RECEIVED <br /> : . <br /> MAY 13 1993 <br /> ENVIRONMENTAL HEALTH 3330 Data Drive <br /> Delta PERMIT/SERVICES Suite 100 <br /> 9Cordova, CA 95670 <br /> En�ironmentat 91616316/63 8-2085 <br /> Consultants,Inc. FAX:9161638-8385 <br /> May 4, 1993 <br /> Ms. Maria 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. 7-3330 <br /> 3128 West Benjamin Holt Drive <br /> Stockton, California <br /> Delta Project No. 40-93-810 <br /> Agency Due Date: May 15, 1993 <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. 7-3330, <br /> located at 3128 West Benjamin Holt Drive, Stockton, California. This letter report presents the <br /> results of quarterly ground water monitoring and sampling conducted on April 5, 1993. 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 performed in accordance with the field methods and procedures described in <br /> Enclosure A. <br /> Ground Water Table Elevations Flow Direction and Hydraulic Gradient <br /> Ground water table elevations were measured in each of the four existing monitoring wells at the site <br /> on April 5, 1993. Depths to ground water in the monitoring wells ranged from 10.05 to 10.42 feet <br /> below the tops of the well casings. The ground water table elevations have increased approximately <br /> 5 feet since the previous monitoring event in November 1992. Ground water table measurements are <br /> presented in Table 1. A water table contour map constructed from the ground water table elevations <br /> recorded on April 5, 1993, is included as Figure 3. The water table contours illustrated in Figure <br /> 3 indicate that ground water flowed toward the northeast with a hydraulic gradient of approximately <br /> 0.005, 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 monitoring wells MW-3, MW-4, MW-5, and MW-6, on <br /> April 5, 1993, were submitted to a California-certified Iaboratory for analysis of benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX), and total petroleum hydrocarbons as gasoline (TPHg). <br /> De#ta Delivers Solutions <br />