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Final Release LLNL Site 300 (USDOE) <br /> Table 3: Exposure Pathways <br /> Pathway Source of Fate and Point of Route of Receptor Time Frame Conclusion for <br /> Contamination Transport Exposure Exposure Population for Exposure Pathway <br /> Contacting GW plume from Plume has Potential Ingestion, There are two FUTURE POTENTIALLY <br /> groundwater eastern GSA been detected use of dermal residential COMPLETE <br /> from private (drum storage, off-site,but contaminated contact, wells down- <br /> wells near burial trenches) has since groundwater inhalation gradient of this <br /> GSA(OU-1) been reduced from private plume <br /> to below wells <br /> drinking water <br /> standards. <br /> Contaminants <br /> from Site 300 <br /> have never <br /> been detected <br /> in water <br /> supply wells. <br /> Contacting GW plume from Plume has Potential Ingestion, There are two PRESENT, POTENTIALLY <br /> groundwater central GSA been detected use of dermal residential FUTURE COMPLETE <br /> from private (dry wells) off-site,but contaminated contact, wells down- <br /> wells near never in groundwater inhalation gradient of this <br /> GSA(OU-1) groundwater from private plume <br /> supply wells wells <br /> Contacting GW plume from No evidence Potential Ingestion, There are two FUTURE POTENTIALLY <br /> groundwater Pit 6 Area of plume use of dermal CSVRA water- COMPLETE <br /> from state (leachate from above drinking contaminated contact, supply wells <br /> wells near unlined debris water groundwater inhalation located <br /> CSVRA(OU-3) trenches and standards from private downgradient <br /> pits migrating off- wells of the plumes <br /> site <br /> Contacting None No evidence N/A N/A N/A PAST, INCOMPLETE <br /> contaminated of soil PRESENT, <br /> soil around contamination FUTURE <br /> S300 off-site <br /> Contacting None No evidence N/A N/A N/A PAST, INCOMPLETE <br /> contaminated of surface PRESENT, <br /> Surface water water or FUTURE <br /> or sediment in sediment <br /> Corral Hollow contamination <br /> Creek off-site <br /> Contacting None No evidence N/A N/A N/A PAST, INCOMPLETE <br /> contaminated of air PRESENT, <br /> air at site contamination FUTURE <br /> boundary <br /> Groundwater <br /> Background <br /> CERCLA mandated groundwater investigations and remediation are underway at Site 300. Areas <br /> of known or suspected groundwater contamination are monitored regularly to determine whether <br /> 13 <br />