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n+ r, DECEMBER 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 to 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 limns of the soil and groundwater contwmnation After PHS-EHD approval, the proposed groundwater monitoring well (MW-4) was installed on August 26, 1996 under the supervision of Mr Michael Infurna (PHS-EHD) Ten subsurface soil samples were collected from the boring advanced to install the well The groundwater and soil sample results were submitted to PHS-EHD in a Request for Closure Report, dated November 1996 PHS-EHD is currently reviewing the report • Water Level measurements from most recent sampling event Table 1 provides water level measurements and other physical data obtained during the December 11, 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 December 11, 1996 water level measurements The water elevations indicate that groundwater was flowing south under an estimated gradient of 0 001 feet per foot The groundwater elevations were not contoured because the elevations measured in the four wells differ by fess than 0 15 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 December 1996 quarterly sampling event BTEX was not detected in the samples TPH-D was detected in MW-2 at a concentration of 3,700 µg/L and in MW-3 at a concentration of 9,300 gg/L 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 pARESsyRo11VOL1 WP1728878108969108969L03WW6