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Report of Findings • Frontier Transportation,Inc. ' August 31, 2005 Page 5 TPH-gas was detected in four samples, with only two elevated levels, which were both at t 10' bgs MW-19 and MW-21 identified TPH-g at 217 mg/kg and 211 mg/kg, respectively Low levels to non-detectable concentrations of BTEX were identified TBA, DIPE, ETBE and TAME were not identified in any of the 12 soil samples collected and analyzed ' r Groundwater monitoring will be conducted in the next quarterly samphng event to be performed in September 200_5 The groundwater sles will be analyzed for TPH-g, BTEX, and MTBE, TBA, DIPE, ETRE, TAME 1,2-DCA andamusing EPA methods 8015M and 8260B as requested by the PHS/EHD Results will be presen in the 2005 Third Quarter Groundwater Report , 5.0) CONCLUSIONS Based on soil sample results from monitoring wells MW-19 through MW-21, it is concluded that MTBE has impacted the subsurface soil along the capillary fringe and within the ' saturated zone of first encountered groundwater The depth of detectable MTBE concentrations coincides with the depth to groundwater beneath thesite t�wtestn orthwe�st of the former UST-19 is located V17-24-64 about 55' west of the former UST area,MW-20 is . area and MW-21 is located approximately 40' northwest of the former UST area This supports that MTBE spread laterally in the soil via the western groundwater gradient 6.0) RECOMMENDATIONS Monitoring wells MW-1 through MW-21 identified elevated MIKE concentrations in soil approximately 40' up to JW away from the former UST area It is Vey mm theElevated that the impacted soil in place at the former UST area should be excavated to pre TBE in soil from acting as a continual source to groundwater contamination Monitoring wells MW-19 through MW-251 v�ville °formation rated in regard g further undwater monitoring episodes Further groundwater any provide delineation on the extent of MTBE impacted groundwater beneath the site