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1 i <br /> f <br /> N 3330 Data Drive <br /> Delta Suite 100 <br /> Rancho Cordova, GA 95670 <br /> Environmental �M 916;638-2085 <br /> Consultants,Inc. FAX:916/638-8385 <br /> November 10, 1993E C En I VFm ^,. <br /> i 4 <br /> �6 <br /> ..NOV 2 9 1999 <br /> Ms. Marla Guensler ENVIRONMENTAL HEALTH <br /> Exxon Company, U.S.A. PERMIT/SERVICES <br /> Post Office Box 4032 <br /> Concord, California 94524-2032 <br /> Subject: Quarterly Ground Water Monitoring Report, Third 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 /> 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 September 7, 1993. The <br /> location of the site is shown in Figure 1 and site features are illustrated in Figure 2. All work <br /> conducted at the site by Delta was performed in accordance with the field methods and procedures <br /> described in 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 September 7, 1993. Sampling information sheets are included in Enclosure B. Depths to ground <br /> water in the monitoring wells ranged from 12.04 to 12.38 feet below the tops of the well casings. <br /> The ground water table elevations have decreased approximately 2 feet since the previous monitoring <br /> event in April 1993. Ground water table measurements are presented in Table 1. A water table <br /> contour map constructed from the ground water table elevations recorded on September 7, 1993, is <br /> included as Figure 3. The water table contours illustrated in Figure 3 indicate that ground water <br /> flowed toward the northeast with a hydraulic gradient of approximately 0.002, which is consistent <br /> with previous data. <br /> Subjective Analysis <br /> No liquid-phase petroleum hydrocarbons or hydrocarbon sheens were present in the wells during the <br /> September 1993 site visit. <br /> t Analytical Results <br /> Ground water samples collected from monitoring wells MW-3, MW-4, MW-5, and MW-6, on <br /> September 7, ' 1993, were submitted to a California-certified laboratory for analysis of benzene, <br /> toluene, ethylbenzene, and total xylenes (BTEX), and total petroleum hydrocarbons (TPH) as <br /> Delta Delivers Solutions <br />