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I <br /> t2002 3rd Quarter Groundwater Report <br /> • Frontier Transportation <br />' 1102-194 <br /> November 26, 2002 <br /> Page 3 <br /> Figure 3, Groundwater Gradient Map) Historic groundwater data identified a west or southwest <br /> flow beneath the site <br /> f4.0) QUARTERLY GROUNDWATER SAMPLE RESULTS <br />' On October 8, 2002, BEII contracted Del-Tech to collect groundwater samples from <br /> monitoring wells MW-1 through MW-13 for laboratory analysis Groundwater parameters (pH, <br /> temperature, and conductivity) were measured before, during, and after well purging (See <br /> Appendix A for Monitoring Well Field Logs) Groundwater samples were analyzed for TPH-d, <br /> TPH-g, BTEX, and MTBE using EPA methods 8015 modified for diesel, 8015 modified for <br /> gasoline, 8020 for BTEX, and 8260 for MTBE, respectively Laboratory analysis results for all <br /> monitoring episodes are presented in Table 1 Recent analytical reports are included as <br /> Appendix Bo ` \�, x,4107 <br /> TO <br /> Historical groundwater data has identified dissolved TPH-m in monitoring well MW-3 <br /> exclusively Maximum concentrations of dissolved TPH-m were identified in MW-3 as 33,000 <br /> µg/L. in January 2000 using EPA method 8015 modified In January 2000, the well cover for <br /> MW-3 was destroyed allowing oily surface water to infiltrate the well BEII concludes that the �p <br /> damaged well cover caused the increase in TPH-m in MW-3 from November 1999 to May 2000 <br /> Dissolved TPH-m concentrations have remained non-detect at the site since September 2000, <br />' when the well cover was repaired BEII, therefore, has discontinued groundwater sample 01 SCJ <br /> analysis for TPH-m at the site <br /> Laboratory analysis identified dissolved TPH-d in monitoring well MW-3 at a maximum <br /> concentration of 33,000 µg/L in January 2000 however it was reported as TPH-d and TPH-m <br /> combined Since then, dissolved TPH-d concentrations in MW-3 have attenuated to non-detect <br /> Iin April, August, and November of 2001 Groundwater analysis resin from April 2002 <br /> identified dissolved TPH-d exclusively from MW-3 as 14,200 µg/L The groundwater level in <br /> MW-3 dropped to its lowest recorded depth (10 72') in April 2002 Monitoring well MW-3 was <br /> abandoned in May 2002 No other detectable concentrations of dissolved TPH-d were identified <br /> from laboratory analysis in any of the wells sampled since then, which includes the 2002 third <br /> quarter sampling episode Groundwater analysis for TPH-d will continue to be performed for the <br /> site <br /> Po�� <br /> Historical groundwater monitor g results have identified TPH-g concentrations above <br /> 1,000 µg/L in MW-I and MW-3 only Maximum dissolved TPH-g concentrations were <br /> identified in March 1998 as 42,000 µg/L in MW-3 "which was the shallowest recorded <br /> groundwater depth in that well Since then, dissolved TPH-g concentrations have attenuated to a <br />