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TABLE 2 ANALYTICAL RESULTS FOR BORINGS B-1, B-2 AND B-3 March 9 and 10, 1993 mg/kg Ethyl- Sample ID TPH as Gas Benzene Toluene benzene Xylene B1-40 ND ND ND ND ND B1-50 ND ND ND ND ND B2-35 ND ND ND ND ND B2-45 ND 00079 ND ND ND B2-50 ND ND ND ND ND B3-40 ND ND ND ND ND B3-50 ND ND ND ND ND mgljcg= parts per million pm ND =Not detected On March 17, 1993, the water level in each well was measured, the wells were purged, and water samples were collected Historical groundwater elevations for the monitoring wells are presented as Table 3 The gradient direction was determined to be 0 0073 ft/ft directed S 7°W Benzene and xylene were detected in MW-2 at 3 7µg/L and 11 µg/L, respectively A summary of all analytical results for groundwater samples is presented as Table 4 2.6 Quarterly Groundwater Monitoring, June 1993 The second sampling event occurred on June 24, 1993 The water level in each well was measured, each well was purged and samples collected Comparing March 1993 and June 1993 measurements indicates that water levels have risen approximately 2 to 2 1/2 feet in all wells (Table 3) The gradient direction for the June sampling event was determined to be 0 0025 ft/ft directed S 70°E The gradient for June, 1993 is shallower than the previous gradient of 0 0073 ft/ft [March 931 and directed 77° farther towards the east No petroleum hydrocarbons were detected in any of the samples (Table 4) 2.7 Excavation Activities The contaminated soil was excavated from the UST site in two phases because of space limitations and equipment capabilities The first phase of excavation was performed on August 30 and 31, 1993 The second phase of excavation was performed on September 21, 1993 After each phase of digging, soil samples were collected from the floor and sidewalls of the excavation The excavator and operator were provided by Ned Pepper, Inc of 0—IDPW w-&s<�,rte. 5 160 9VMd-a�QR