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JUNE 1993 <br /> QUARTERLY STATUS REPORT (CONTINUED) <br /> • A site map showing the "zero line" of contamination, and changes in <br /> analyses and gradient measurements over the last quarter: <br /> A "zero line" for groundwater contamination has not been mapped because <br /> BTEX and TPH-D contamination have not been detected- 1n any of the y <br /> groundwater samples collected at the site to date with the exception of the <br /> December 1992 detection of toluene in MW-1 (0 5 gg/1) and the recent trace <br /> concentrations detected in MW-2 and MW-3 during the June sampling event <br /> The soil "zero line" has been defined based on the results of the supplemental <br /> site assessment <br /> • Tabulated data for all monitoring wells including groundwater elevations a <br /> collected to date: <br /> The physical data collected during the preliminary site investigation and <br /> subsequent quarterly sampling events for all of the monitoring wells located at <br /> the facility are presented 1n Table 1 <br /> • A site map delineating groundwater elevation contours based on recent <br /> data: <br /> Groundwater elevations determined by water level measurements made on <br /> June 9, 1993 suggest a southerly groundwater flow direction under a very low <br /> hydraulic gradient (Figure 2) <br /> • Analytical results from all previous sampling events including laboratory <br /> reports for the most recent sampling event and chain-of-custody <br /> documentation: <br /> A summary of the analytical results from all previous groundwater sampling <br /> events is presented in Table 3 A summary of the analytical data for all soil <br /> samples collected to date is presented In Table 4 The laboratory results from <br /> the most recent groundwater sampling event, including chain-of-custody <br /> documentation, are included in Appendix A. <br /> 1MUSY360 2210061 REV 1 <br /> 3 <br />