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II 1 I II I ii�•..�w_ -� »��T-Y--=��-- —<��- _-- _-----�.-1:.�.� �. � - _--�---n- -� �e-ter �.��„ .„^s --�.- - �»._�.�'II � - w�.�,..�. ' s I � TABLE 2 ANALYTICAL RESULTS FOR BORINGS B-1, B-2 & B-3 (MW -1, MW -2.& MW -3), ,March 9 and 10, 1993 (mg/kg) Sample ID TPH as Gas Benzene Toluene Ethyl - -benzene Xylene " t ', B1-40 `_ - ND ., u -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 ! F ND -ND ND ND ND B3-50 ND ND ND ND' ND ND = Not detected On March 17, 1993, the water level in each well was measured, the wells were purged, and water samples were collected Hhstoncal groundwater elevations for the momtonng,wells are �I presented as Table 3 The gradient direction was determined to be 0 0073 ft/ft directed S 70 W Benzene and xylene were detected in MW -2 at 3 7 µg/L and 1 1 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 k ' measured, each well was purged and samples collected Between March 1993 and June 1993 i I water levels rose approximately 2 to 2 1/2 feet in all wells (see Table 7) The gradient direction for the June sampling event was determined to be 0 0025 ft/ft directed S 700 E i' The gradient for June 1993 was more shallow than the previous gradient of 0 0073 ft/ft (March 1993)'and directed 77° farther towards the east No petroleum hydrocarbons were detected in any of, the samples (Table 7) 2.7 Excavation Activities p iEl I i' 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, i 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 1 f G—I.alnI Auld Se— [er � 5 1 6IJ4=C.1 4R , I }