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, ' u MARCH 1993 QUARTERLY STATUS REPORT (CONTINUED) • Analytical results of groundwater or soil sampling: Results of the fourth quarterly sampling event (March 1993) are summarized 1n Table 2 BTEX and TPH-D concentrations were below the method detection limits in all of the groundwater samples collected • 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 have not been detected in any of the groundwater samples collected at the site to date with the exception of-the December 1992 detection of toluene in MW-1 (0 5 µg/l) (The soil "zero line" i will be determined with the results of the supplemental site assessment, and included in the July quarterly report which will be submitted to EHD no later than July 17, 1993 • • Tabulated data for all monitoring wells including groundwater elevations collected to date: The physical data collected during the preliminary site investigation and subsequent quarterly sampling events for all of the monitoring wells located at the facility are presented in Table 1 i • A site map delineating groundwater elevation contours based on recent data: Groundwater elevations determined by water level measurements made on March 5, 1993 suggest a southerly groundwater flow direction under a very low hydraulic gradient (Figure 2) i 4 • 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 LMIJSY360 2210021 REV 3 3