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20042 nd Quarter Groundwater Report Frontier Transportation August 9, 2004 Page 6 Detectable concentrations of dissolved ETBE and TAME were identified exclusively in monitoring well MW-3R for the groundwater samples collected in June 2004 ETBE was found at 3 2 µg/L and TAME was identified at 2 9 µg/L No detectable ETBE or TAME was identified I in the other 17 wells Groundwater samples collected from the remaining all 18 monitoring wells identified no detectable concentrations of TBA, DIPE, 1,2-DCA or EDB using EPA method 8260 ' 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 expanding to the west No detectable to low level concentrations (below CDHS primary MCLS) of dissolved TPH-d, TPH-g and BTEX were identified in all 18 monitoring wells dedicated to the ' site However, the identification of dissolved MTBE in MW-1, MW-3R, and MW-17 indicates that lateral migration of MTBE may be occurring beneath the site ' BEII recommends that quarterly groundwater monitoring continue at the site until constant or decreasing dissolved MTBE concentrations are observed Groundwater samples will be analyzed for BTEX using EPA method 8020, TPH-d and TPH-g using EPA method 8015m, ' and oxygenates using EPA method 8260 in all future monitoring episodes as directed by the PHS/EHD Should dissolved MTBE concentrations continue to be above EPA primary MCLS beneath the site, then groundwater remediation/treatment may be warranted I I I I