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SEPTEMBER 1996 QUARTERLY STATUS REPORT (CONTINUED) In August 1994, Greyhound returned to a quarterly sampling program in response to a request from PHS-EHD (letter dated August 12, 1994) The PHS-EHD was concerned about rising water levels beneath the site and the detection of TPH-D in one of the groundwater samples collected in June 1994 The second Supplemental Site Assessment Report was submitted by Greyhound to PHS- EHD in November 1994 Greyhound received comments to the Supplemental Site Assessment Report in a letter dated February 3, 1995 In response, one additional groundwater monitoring well was proposed to define the western limits of the soil and groundwater contamination After PHS-EHD approval, the final groundwater monitoring well (MW-4) was installed on August 26, 1996 under the supervision of Mr Michael Infurna (PHS-EHD) The TPH-D and BTEX results for soil and groundwater samples✓ collected from the new well werenon-detec Results will be included in the final closure report referenced in the cover letter as agreed to by PHS-EHD Water Level measurements from most recent sampling event Table 1 provides water level measurements and other physical data obtained during the September 4, 1996 site visit Free-product and hydrocarbon sheens were not observed in any of monitoring wells Figure 2 is a site plan that includes water level elevations based on the September 4, 1996 water level measurements An updated site plan, incorporating newly installed MW-4 will be provided with the final closure request The water elevations indicate that groundwater was flowing youth under an estimated gradient of 0 002 feet per foot The groundwater elevations were not contoured because the elevations measured in the three wells differ by less than 0 20 feet Water Level measurements from previous monitoring events Table 1 presents the water level measurements and other physical data obtained during previous monitoring events Free-product and hydrocarbon sheens were not observed in any of the monitoring wells during these events • Analytical results from most recent sampling event Table 2 summarizes the analytical results from the September 1996 quarterly sampling event None of the MTBE/BTEX or TPH-D analytes were detected in the samples The laboratory report and chain-of-custody record are provided in Appendix A • AnaIytical results from previous sampling events Table 3 presents a summary of the analytical results from all previous groundwater sampling events PARESSYROIWOL1 WP1728878108969108969L.02WW6 2