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2003 1st Quarter Groundwater Report . Frontier Transportation June 4, 2003 Page 3 ' between the backfill material and native soil can cause groundwater to accumulate within the backfill material as it flows in the downgradient western direction Historic groundwater data identified a west or southwest flow beneath the site -- 4.0) QUARTERLY GROUNDWATER SAMPLE RESULTS On Apnl 4, 2003, BEI[ contracted Del-Tech to collect groundwater samples from monitoring wells MW-1 through MW-13 for laboratory analysis Groundwater parameters (pH, temperature, and conductivity) were measured before, during, and after well purging (See Appendix A for Monitoring Well Field Logs) Groundwater samples were analyzed for TPH-d, TPH-g, TPH-m, BTEX, and MTBE using EPA methods 8015 modified for diesel, 8015 modified for gasoline, 8015 modified for motor oil, 8020 for BTEX, and 8260 for MTBE, respectively A � I Laboratory analysis results for all monitoring episodes are presented in Table 1 Recent e� analytical reports are included as Appendix B ojQ 4 IHistorical groundwater data has identified dissolved TPH-m in monitoring well MW-3 exclusively Maximum concentrations of dissolved TPH-m were identified in MW-3 as 33,000 µg/L in January 2000 using EPA method 8015 modified 'In January 2000, the well cover for lie MW-3 was destroyed allowing oily surface water to infiltrate the well BEH concludes that the damaged well cover caused the increase in TPH-m in MW-3 from November 1999 to May 2000 Dissolved TPH-m concentrations have remained non-detect at the site since September 2000, when the well cover was repaired BEII, therefore, has discontinued groundwater sample analysis for TPH-m at the site -> iLaboratory analysis identified dissolved TPH-d in monitoring well MW-3 at a maximum concentration of 33,000 µg/L in January 2000, however it was reported as TPH-d and TPH-m - I combined Since then, dissolved TPH-d concentrations in MW-3 have attenuated to non-detect in April, August, and November of 2001 Groundwater analysis results from April 2002 identified dissolved TPH-d exclusively from MW-3 as 14,200 µg/LThe groundwater level in MW-3 dropped to its lowest recorded depth (10 72') in Apn12002, Monitoring well MW-3 was abandoned in May 2002 'Replacement well MW-3R identified no detectable concentrations of dissolved TPH-d i4o other detectable concentrations of dissolved TPH-d were identified from ' laboratory analysis in any of the wells sampled since then, which includes the first quarter 2003 sampling episode Groundwater analysis for TPH-d will continue to be performed for the site J '41AW•3I�, ' Historical groundwater initoring results have identified TPH-g concentrations above 1,000 µg/L in MW-1 and MW 3/(only Maximum 4issolved TPH-g concentrations were identified in March 1998 as 42,000 µg/L,in MW-3, which was the shallowest recorded groundwater depth in that well Since then, dissolved TPH-g concentrations have attenuated to a