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no HCL values have been established, NO MCLs have been assigned for <br /> TPN/gasoline or TPH/diesel in water. <br /> 5.0 CONCLU NS <br /> Based on the chemical analyses and the groundwater gradient data, the <br /> following conclusions are made: <br /> Groundwatar contamination is limited to t <br /> he two excavation pit areas <br /> around MW-1 and MW-2, as no detectable levels were found in the <br /> surrounding wells beyond the excavation areas or in the downgradient <br /> wells MW-5 or MW-6; <br /> • Groundwater contaminant levels for most of the tested constituents <br /> have decreased in M%J-1 and Mw-2 since the December 1986 sample <br /> analyses; and <br /> Y Groundwater gradients are south-southwest. <br /> I£ the reduced contaminant levels seen in MW.1 are assutued <br /> attributable to extraction, then continued extraction, to be <br /> and treatmaa�t at the <br /> surface, of groundwater from Mw-1 (and MW-2 if required), combined with annual <br /> �.. sar-'pliltg of the surrcundin <br /> g wells, may be a cost effective way to reduce <br /> contaminant levels in the groundwater, and to ensure that reduced levels are not <br /> due to migration of contaminants away f <br /> rom e tank <br /> ion <br /> critical factor will be determining the levels h acceptable atotthe areas, A <br /> agencies that are specific to site conditions at the a regulatory <br /> facility, dolt Brothers Tractor <br /> BIONTL.H2O <br /> 6 <br /> April, 1990 <br />