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1 <br /> Ile 2006 15` Quarter Groundwater Report <br /> Frontier Transportation, Inc. <br /> I <br /> April 28,2006 <br /> Page 7 <br />' contained dissolved ETBE at 20pg/L, dissolved TAME at 16 6µg/L and dissolved TBA at 234 ` <br /> µgA- <br />' In past sampling events MW-21 identified ETBE and TAME However, since product <br /> sheen was present, the sample required a higher dilution in the laboratory, which increased the <br />' detection limit for that sample to 200 pg1L The reporting limit for DIPE, ETBE and TAME was <br /> 2 pg/L and for TBA it was l0 pg/L See Appendix B for laboratory analytical results <br /> gVj <br /> 5.0 WASTE MANAGEMENT � <br />' Any free product, purged groundwater, and decontanunation water generated from the <br /> site during sampling activities will be stored in sealed 55-gallon drums for a period not to exceed <br /> 90 days Stored wastes will be profiled for hazardous constituents and characterized as Non- <br /> Hazardous, California Hazardous, or RCRA Hazardous, as appropriate Any transportation of <br /> waste will be under appropriate manifest <br />' • 6.0} CONCLUSIONS AND RECOMMENDATIONS <br /> Based on groundwater sample analysis results, the dissolved MTBE plume appears to be <br /> continuing to expand westward The sudden appearance of product sheen indicates that a <br /> contaminant source is present and needs to be removed expeditiously Elevated concentrations of <br />' dissolved TPH-g were identified in MW-2 and MW-21, which are located to the north of the <br /> suspected contaminant source area-/The identification of elevated levels of dissolved MTBE in 9 <br /> wells indicates that lateral migration of MTBE is continuing to occurr beneath the site <br />' Nfi ration of MTBE indicates that corrective action needs to be initiated to prevent <br /> g <br />' additional migration BEA recommends that quarterly groundwater monntonng continue at the <br /> site until constant or decreasing dissolved MTBE concentrations are observed Groundwater <br /> samples will be analyzed for TPH-g using EPA method 8015m and for oxygenates And BTEX <br /> using EPA method 8260 in all fixture monitoring episodes as directed by the HD <br /> 1 <br /> 1 <br /> • <br /> I <br />