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,r ni JUNE 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 has 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 • Water Level measurements from most recent sampling event Juable 1 provides water level measurements and other physical data obtained during the ne 4, 1996 site visit Free-product and hydrocarbon sheens were not observed in any of monitoring we s Figure 2 is a site plan that includes water level elevations based on the June 4, 1996 water level measurements The water elevations indicate that groundwater was flowing south under an estimated gradient of 0 002 feet er t The groundwater elevations were not contoured because the elevations measured in the three wells differ by less than 0 20 feet • Water Level measurements fromrevious monitoring events P g Table 1 presents the water level measurements and other physical data obtained dunng 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 June 1996 quarterly sampling event None of the MTBE/BTEX analytes w,ere detected in the samples TPH-D was detected in t e same a co ec a �om MW-2-fit a concentration of 330 pg/T- and in the sample collected from MW-3 at a concentration of L20Q u�, The laboratory report and chain- of-custody record are provided in Appendix A • Analytical results from previous sampling events Table 3 presents a summary of the analytical results from all previous groundwater sampling events Table 4 presents a summary of the analytical results from all previous soil sampling events Site map delineating contamination contours for groundwater and soil based on recent data PARESSYROi1VOL1 WP1728878148969148969LOi WW6 2