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Binayak Acharya Project 2074-001.01 <br /> May 18, 1995 <br /> Page 4 <br /> s <br /> • The modeling does not account for any losses during infiltration from either <br /> biological or non-biological processes. In reality, such losses, especially over the <br /> many years predicted necessary for groundwater to become impacted <br /> (Appendix A), are likely to significantly reduce ;,the concentrations of these <br /> chemicals or even entirely prevent them from reaching groundwater. <br /> • If these chemicals ever reach groundwater, their concentrations will be <br /> significantly reduced below the concentrations presented in Table 3. The <br /> concentrations predicted by the model are the concentrations the soil pore-liquid <br /> just above the water table. Immediately upon entering the groundwater, however, <br /> these levels will be reduced upon mixing with the water in the saturated zone. <br /> EVALUATION OF REMEDIAL ALTERNATIVES <br /> This section evaluates three remedial alternatives for the impacted soil at the Site. These <br /> alternatives include no action, groundwater monitoring, and'soil excavation with disposal <br /> or treatment. 9 <br /> No Action <br /> The modeling indicates that if the no-action alternative is selected, the impacted soil on site <br /> will have no adverse effect on human health and the environment. Because the source area <br /> is at a depth of approximately 11 feet BGS and the surface lis covered by asphalt, there <br /> does not appear to be any exposure pathway for dermal contact, or ingestion of impacted <br /> soil. Inhalation of vapors also appears not to be a significant exposure pathway for the <br /> non-petroleum chemicals (because of their low concentrations, the limited extent of soil <br /> impact, and the presence of a permanent cover) nor the petroleum compounds (because of <br /> their nonvolatile nature). As stated previously, ingestion of!impacted groundwater from <br /> the source is not likely based on the extremely long time required for the source to impact <br /> the groundwater and the low analyte concentrations predicted by the VHS model. The <br /> immobility of these chemicals effectively isolates them from contacting potential human or <br /> environmental receptors. Furthermore, the compounds would likely be diluted once they <br /> entered the groundwater. <br /> ]:1SECM2120740010.1 SR-9511jt:2 <br />