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SEPTEMBER 1992 QUARTERLY STATUS REPORT (CONTINUED) • A site map showing the "zero line" of contamination, and changes in analyses and gradient measurements over the last quarter; A "zero line" for groundwater contamination has not been mapped because BTEX and TPH-D contamination were not detected in any of the groundwater -- samples collected at the site to date The soil "zero line" will be determined during the proposed supplemental subsurface investigation. The area of soil contamination appears to be limited, with analytes detected at MW-2, MW-3, and B-1 only • Tabulated data for all monitoring wells including groundwater elevations collected to date; v The physical data collected to date for all of the monitoring wells located at the facility are presented in Table 1. • A site map delineating groundwater elevation contours based on recent data; Groundwater elevations determined by water level measurements made on September 1, 1992 suggest a southerly groundwater flow direction (Figure 2). • Analytical results from all previous sampling events including laboratory reports for the most recent sampling event and chain-of-custody documentation; A summary of the analytical results from all previous groundwater sampling events is presented in Table 3. No BTEX or TPH-D contamination has been detected in the monitoring wells to date. A summary of the analytical data for all soil samples collected to date is presented in Table 4. The laboratory results from the most recent groundwater sampling event, including chain-of-custody documentation, are included in Appendix A. • Site map delineating contamination contours for soil and groundwater based on recent data; No contamination was detected in groundwater samples collected on September 1, 1992 (Figure 3) Figure 4 is a site map indicating areas of soil contamination based on data obtained during the preliminary site investigation (September 1991). The area of contamination appears to be limited, with constituents detected at MW-2, LML/SY139 311294 REV 3 3