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I t2002 3rd Quarter Groundwater Report • Frontier Transportation ' 1102-194 November 26, 2002 Page 3 Figure 3, Groundwater Gradient Map) Historic groundwater data identified a west or southwest flow beneath the site f4.0) QUARTERLY GROUNDWATER SAMPLE RESULTS ' On October 8, 2002, BEII 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, BTEX, and MTBE using EPA methods 8015 modified for diesel, 8015 modified for gasoline, 8020 for BTEX, and 8260 for MTBE, respectively Laboratory analysis results for all monitoring episodes are presented in Table 1 Recent analytical reports are included as Appendix Bo ` \�, x,4107 TO Historical 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 MW-3 was destroyed allowing oily surface water to infiltrate the well BEII concludes that the �p 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 01 SCJ analysis for TPH-m at the site Laboratory 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 combined Since then, dissolved TPH-d concentrations in MW-3 have attenuated to non-detect Iin April, August, and November of 2001 Groundwater analysis resin from April 2002 identified dissolved TPH-d exclusively from MW-3 as 14,200 µg/L The groundwater level in MW-3 dropped to its lowest recorded depth (10 72') in April 2002 Monitoring well MW-3 was abandoned in May 2002 No other detectable concentrations of dissolved TPH-d were identified from laboratory analysis in any of the wells sampled since then, which includes the 2002 third quarter sampling episode Groundwater analysis for TPH-d will continue to be performed for the site Po�� Historical groundwater monitor g results have identified TPH-g concentrations above 1,000 µg/L in MW-I and MW-3 only Maximum dissolved 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