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DECEMBER 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 - t - samples collected at the site to date with the exception of the recent detection of - toluene in MW-1. 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: 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 December 9, 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 with the exception of toluene which was detected in MW-I during the December sampling event at a concentration of 0 5 µg11 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 LMIJSY139 31/378 3