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1 2005 4" Quarter Groundwater Report � Frontier Transportation,Inc. February 13, 2006 ft° �bu ' Page 6AYA 12 for MTBE in (-20 over time) The fourth quarter 2005 groundwater sampling also ' identified dnssolyE in MW-2 at 1,510 gg/L, m MW-9 at ��-µg/L and in MW-17 at 162 pg/L MW-19, and MW-21 identified decreased dissolved MTBE at 27 7 µg/L, 3,020 pg/L, and 040spectively Dissolved MTBE was detected above the MCL for all detectable results, including deep well MW-18 at 47 4 µg/L Dissolved MTBE was non-detect (<2 pg/L) in MW-13, MW-14, MW-15 and MW-16 See Figure),3for the recent shallow well MTBE Isoconcentration Map j L Beginning in March 2004, all groundwater samples collected were analyzed for oxygenates ETBE, TAME, TBA, DIPE, 1,2-DCA and EDB using EPA method 8260 Detectable concentrations of analyzed oxygenates were identified in December 2005 Dissolved ETBE was found in MW-2. MW-3R, and MW-21 with a maximum of 58 7 gg/L (MW-21) Dissolved TAME was identified in MW-2, MW-3R and MW-21 with a maximum of 42 gg/L (MW-21) Dissolved TBA was only found in MW-2 at 77 6 gg/L The reporting limit for DIPE, ETBE and ' TAME was 2 pg/L and for TBA it was 10 pg/L See Appendix B for laboratory analytical results ' . 5.0) WASTE MANAGEMENT Any free product, purged groundwater, and decontamination water generated from the ' site during sampling activities will be stored in sealed 55-gallon drums for a period not to exceed 90 days Stored wastes will be profiled for hazardous constituents and characterized as Non- Hazardous, California Hazardous, or RCRA Hazardous, as appropriate Any transportation of waste will be under appropriate manifest 6.0) CONCLUSIONS AND RECOMMENDATIONS ' Based on groundwater sample analysis results, the dissolved MTBE plume appears to be continuing to expand westward, with some northern migration Elevated concentrations of dissolved TPH-g were identified in the MW-21 and elevated levels of BTEX were found in MW- 3R The identification of elevated levels of dissolved MTBE in 9 wells indicates that lateral migration ofMTBE is occurring beneath the site Dissolved MTBE was above the MCL in deep ' well MW-18, which indicates that vertical migration may also be occurring at the site L Migration of MTBE indicates that corrective action need to be initiated to prevent ' additional migration and to remove the present contamination An Interim Corrective Action Plan has been submitted to the San Joaquin Environmental Health Department for,review Corrective action will begin upon approval / 16 8 P re S • VM v� q