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2005 Yd Quarter Groundwater Report Frontier'Transportation,Inc. December 5,2005 Page 6 identified at 945 pg/L, a slight decrease from the previous sampling event (See Figure 12 for MTBE in MW-3R over time). The thud quarter 2005 groundwater sampling also identified dissolved MTBE in MW-9 at 871 µg/L and in MW-17 at 193 gg/L. MW-19,MW-20 and NM- 21 W21 identified dissolved MTBE at 80.2 µg/L, 4,620 µg/L, and 8,750µg/L,respectively tissolved MTBE was detected below the MCL in MW-2, MW-15 and MW-18."he elevated dissolved MTBE concentrations are limited to the shallow monitoring wells only Dissolved MTBE was ' non-detect(<2 µg/L) in MW-13, MW-14 and MW-16.�See Figure 13 for the recent shallow well MTBE Isoconcentration Map �. ' 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 September 2005 Dissolved ETBE was ' found in MW-1, MW-3R, MW-9, MW-20 and MW-21 with a maximum of 29 µg/l,(MW-21) i Dissolved TAME was identified in MW-1, MW-31;, MW-20 and MW-21 with a maximum of ' 213 gg/L(MW-21).'Dissolved TBA was only found in MW-I and MW-3R at 129 µg/L and 39 3 µg/L, respectively The reporting limit for DIPE, ETBE and TAME was 2 pg/L and for TBA it was 10 µg/L. See Appendix B for laboratory analytical results 1 • 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 RECOMMENDA'T'IONS Based on groundwater sample analysis results, the dissolved MTBE plume appears to be ' continuing to expand westward EIevated concentrations of dissolved TPH-g and BTEX were identified only in the MW 21 However,the identification of elevated levels of dissolved MTBE in 7 wells indicates that la teral�migration of MTBE as occurring beneath the site BEA recommends that quarterly groundwater monitoring continue at the site until constant or decreasing dissolved MTBE concentrations are observed. Further,migration of ' MTBE indicates that corrective action need to be initiated to prevent additional migration. Groundwater samples will be analyzed for TPH-g using EPA method 8015m and for oxygenates ' and BTEX using EPA method 8260 in all future monitoring episodes as directed by the PHS/EHD