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' Report of Findings Frontier Transportation ' 03-28-98 March 28, 1998 ' Table 5: Groundwater Sampling Results Well ID Date DTW TPH-g TPH-d B T E X MTBE ' MW-1 08/96 10.34' 1,800 <50 98 18.8 55.8 130 1,300 04/97 9.21' 520 68 31 <0.5 2.8 1.5 910 ' 03/98 6.90' <50 X500 <0.5 <0.5 <0.5 <1 11 MW-2 08/96 10.20' 850 95 12.7 7.9 4.5 120 12.3 04/97 9.02' 73 250 6.4 <0.5 2.2 0.7 <12.5 ' 03198 6.70' <50 <500 <0.5 <0.5 <0.5 <1 <5.0 MW-3 08/96 10.40' 8,000 610 610 170 96.6 540 1,700 04/97 9.25' 30,000 1,800 3,200 2,000 1,400 1,000 14,000 ' 03/98 7.10' 42,000 <500 7,290 500 <25 560 29,400 MW4 03/98 6.20' <50 <500 <0.5 <0.5 <0.5 <1 <5.0 MW-5 03198 7.06' <50 <500 <0.5 <0.5 <0.5 <1 <5.0 MW-6 03198 7.05' <250 1,500* <2.5 <2.5 <2.5 <5.0 <25 MW-7 03148 6.70' <50 <500 <0.5 <O.S <0.5 <l <5.0 *=Unknown compounds in motor oil range. Laboratory analytical results identified no detectable concentrations of TPH-d, TPH-g, BTEX, and MTBE in groundwater samples collected from monitoring wells MW-2,MW-4, MW-5, and MW-7. Groundwater collected from monitoring well MW-1 identified 11 µg/L as MTBE exclusively. No other gasoline constituents were identified from laboratory analysis. Laboratory sample analysis identified a TPH-d concentration of 1,500 µg/L from monitoring well MW-6, however, some compounds in the TPH-d gas chromatogram peak were identified as ' compounds in the motor oil range (See Appendix E), 7.0) CONCLUSIONS ' Based on the site m e assess ent results, petroleum hydrocarbons have impacted the ' groundwater near the vicinity of the former USTs in monitoring well MW-3 only. All other monitoring wells dedicated to site groundwater monitoring identified no detectable concentrations of TPH-g or BTEX (See Figure 6, TPH-g Isoconcentration Map and Figure 7, BTEX ' Isoconcentration Map). MTBE was detected exclusively in monitoring well MW-3. Soil sample analysis identified no detectable concentrations of petroleum hydrocarbons or MTBE from monitoring wells MW-4 through MW-7. BEI, Inc. therefore concludes that petroleum impacted ' soil and groundwater is limited to the vicinity of the former gasoline USTs and confined to the 1 7