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5.0 REMEDIATION <br /> 5.1 Remedial Objectives <br /> Remedial objectives are identified to provide direction in developing remedial actions neces- <br /> sary to achieve the aforementioned goals Remedial objectives also serve as a baseline for <br /> measuring achievement Soil-based and groundwater-based objectives are identified below <br /> • Groundwater Within technical and economic constraints (1) achieve <br /> water quality goals, (2) prevent the use of, or exposure to, groundwater <br /> within the compliance boundary until water quality goals are met, and <br /> (3)protect groundwater outside the dissolved plume boundary <br /> • Sail Within technical and economic constraints, reduce the threat posed to <br /> groundwater by elevated hydrocarbon concentrations in soil and prevent <br /> • exposure to affected soil <br /> The groundwater-based remedial objectives apply to groundwater beneath the site, and off <br /> site, however, data suggest it is possible the dissolved-hydrocarbon plume is mixing with an <br /> off-site source This assertion is based on a comparison of groundwater analytical results <br /> from Well MW-13 with data for all other wells A comparison of these results shows an <br /> inconsistency in the expected fate and transport of petroleum hydrocarbons The inconsis- <br /> tency could be due to hthology, petroleum hydrocarbon chemical characteristics, or an off-site <br /> source In any case, to achieve the groundwater-based remedial objectives, an off-site source <br /> investigation is required and complete dissolved-hydrocarbon plume delineation is necessary <br /> The soil-based objective applies to specific soil volumes that he between approximately 15 and <br /> 45 feet bgs Laterally, residual soil impact appears to be restricted to the areas beneath the <br /> former subsurface gasoline storage tanks Achievement of soil- and groundwater-based <br /> remedial objectives will be subject to technical and economic constraints, therefore, modifica- <br /> tions to soil and water quality goals (and associated remedial objectives) may be necessary <br /> Remedial objective achievement will be evaluated through analysis of data resulting from <br /> implementation of the recommended remedial alternative <br /> 3201337B/1918REV 18 August 31, 1995 <br />