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' 3 EVALUATION OF REMEDIAL ALTERNATIVES ' This section evaluates four remedial alternatives for the impacted soil at the Site The alternatives are "no action," groundwater monitoring, soil excavation with disposal, and soil excavation with treatment 3.1 No Action ' The impacted soil on site will not adversely affect human health or the environment Because the only soil sample that was impacted was at 11 feet BGS and the surface is ' covered by asphalt, there does not appear to be any exposure pathway for dermal contact, nor for ingestion of impacted soil Inhalation of vapors also does not appear to be a significant exposure pathway for the nonpetroleum chemicals (because of their low ' concentrations, the limited extent of soil impact, and the presence of a permanent cover) or the petroleum compounds (because of their nonvolatile nature) The modeling indicates that groundwater impact in excess of drinking-water standards is not likely This is due to the extremely long time required for the source to migrate to groundwater and natural attenuation The immobility of these chemicals effectively prevents them from contacting potential human or environmental receptors Furthermore, the concentration of the compounds would likely be even further reduced once they entered the groundwater 3.2 Groundwater Monitoring In this alternative, semiannual groundwater monitoring would be performed on well MW- ' 1 for one year The samples would be analyzed for TPH by USEPA method 8015M and for VOCs by USEPA method 8260 ' Based on the infiltration modeling presented in Appendix D, it will take more than 10,000 years for the compounds to impact the groundwater Based on this, a ' groundwater monitoring program over the next year therefore is not a realistic option and will not provide useful results I\Pj21RXK00285 DOC 951jlc 1 Rev 0,8/28/95 22074-001 001 3-1