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2004 1" Quarter Groundwater Report <br /> •' Frontier Transportation <br /> May 20, 2004 <br /> Page 6 <br />' Groundwater samples collected from all 18 monitoring wells identified no detectable <br /> concentrations of TBA, DIPE, ETBE, TAME, 1,2-DCA or EDB using EPA method 8260 <br /> 5.0) WASTE MANAGEMENT <br /> Any free product, purged groundwater, and decontamination 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 The purge water generated from previous groundwater <br /> sampling events (1,900 gallons) have been removed under manifest by Amberwick Corporation <br /> to the Remedy Environmental facility in Anaheim for disposal (See Appendix C) In addition, all <br />' drummed soil cuttings were also removed from the site by Amberwick Corporation to the Azusa <br /> Land Reclamation facility in Azusa (See Appendix C) <br />' 6.0) CONCLUSIONS AND RECOMAMNDATIONS <br /> Based on groundwater sample analysis results, the dissolved MTBE plume appears to be <br /> expanding to the west No detectable to low level concentrations (below CDHS primary MCLs) <br /> of dissolved TPH-d, TPH-g and BTEX were identified in all 18 monitoring wells dedicated to the 'O <br /> the identification of dissolved MTBE m MW-1, MW-3R, MW-9 and MW-17 <br /> site However, ) � S��L <br />' indicates that lateral migration of MTBE may be occurring beneath the site <br /> BEE recommends that quarterly groundwater monitoring continue at the site until a' <br />' constant or decreasing dissolved MTBE concentrations are observed Groundwater samples will y <br /> be analyzed for BTEX using EPA method 8020, TPH-d and TPH-g using EPA method 8015m, <br />' and oxygenates using EPA method 8260 in all future monitoring episodes as directed by the <br /> PHS/EHD Should dissolved MTBE concentrations continue to be above EPA primary MCLS <br /> beneath the site, then groundwater remediation/treatment may be warranted <br /> 1 <br />