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II <br /> I� <br /> F QUARTERLY FLUID-LEVEL MONITORING <br /> AND GROUND WATER SAMPLING REPORT <br /> I+ Southland Location No. 20304 <br /> 455 Grant Line Road <br /> Tracy, California <br /> July 22, 1992 <br /> INTRODUCTION <br /> The enclosed report presents findings and conclusions of second quarter 1992 fluid-level <br /> monitoring and sampling for Southland Location No. 20304, 455 Grant Lune Road, Tracy, <br /> California. A site vicinity map is shown in Figure 1, and a site plan presenting monitoring <br /> well locations is shown in Figure 2. <br /> PROJECT ACTIVITIES <br /> In June 1992, The Southland Corporation retained Alton Geoscience to perform quarterly <br /> fluid-level monitoring and ground water sampling of Monitoring Wells MW-1 through <br /> MW-15. Monitoring and sampling was performed June 19, 1992. The project background <br /> is presented in Appendix A. <br /> FIELD PROCEDURES <br /> On June 19, 1992, Alton Geoscience measured fluid-levels and collected ground water <br />' samples from Monitoring Wells MW-1 through MW-15. Samples were analyzed for total <br /> petroleum hydrocarbons as gasoline (TPH-G); benzene, toluene, ethylbenzene, and total <br /> xylenes (BTEX); and fecal coliform (E C.). Ground water monitoring and sampling <br /> procedures are presented in Appendix B. <br /> FLUID-LEVEL MONITORING <br /> Fluid-level monitoring results for June 19, 1992, and previous ground water monitoring data <br /> obtained by others, are summarized in Table 1. Fluid-levels were measured in all <br /> monitoring wells. The average depth to ground water was approximately 516 feet below <br /> grade (fbg) across the site,with a gradient of approximately 0 003 foot/foot to the northeast <br /> Figure 3 shows a ground water elevation contour map based on fluid-level measurements. <br /> Figure 4 presents a map showing the lateral extent of the benzene plume. <br />�I <br /> f <br />