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Groundwater ingestion was calculated for <br /> 1 Onsite groundwater ingestion, commercial The groundwater located in the shallow aquifer <br /> (Zone A) beneath this site is not suitable for commercial or domestic use due to the dry <br /> cleaning solvent plume associated with Lincoln Village The site is situated at the southeast <br /> corner of Lincoln Village which contains a dry cleaning solvent plume consisting of <br /> perchloroethylene (PCE), trichloroethylene (TCE) and 1,2-dichloroethylene (DCE) within the <br /> shallow aquifer that lies beneath R603 and will be undergoing a massive remediation <br /> groundwater pump and treat project (Interim Source Area Remedial Investigation Report, <br /> Lincoln Center, May 22, 1998 —Levine Fricke Recon) <br /> 2 Off site ingestion, Domestic The closest domestic well is 780 feet from the site and is cross <br /> gradient to the groundwater plume, and the closest down gradient wells is 3390 feet from the <br /> site Because the down gradient well is the only well likely to be impacted by the plume, a well <br /> distance of 3000 feet was used to calculate off-site ingestion <br /> CONCENTRATIONS USED <br /> In order to test the probable impact of the current groundwater plume the upper confidence level <br /> (UCL) concentrations were calculated for the Monitor Wells within the plume, from the September <br /> 16 1998 sampling round <br /> The values used to determine the soil impacts were the highest values from the June 1997 <br /> conformation borings <br /> COMPOUND MILLIGRAMS/LITER WELL <br /> Benzene Water 0 005 UCL <br /> Benzene Soil 0 005 Detection limit <br /> Ethylbenzene Water 022 UCL <br /> Ethylbenzene Soil 0 18 Highest value SB5-65' <br /> TPHg water represented in 34 UCL <br /> the RBCA by Hexane <br /> TPHg soil represented in 87 Highest value SB6-50' <br /> the RBCA by Hexane <br /> MTRF Water 0 029 UCL <br /> MTBE Soil 0 005 Detection limit <br /> Toluene Water 0 058 UCL <br /> Toluene Soil 0 005 Detection limit <br /> Xylenes Water 049 UCL <br /> Xylenes Soil 77 SB7-50 <br /> M <br /> 10 R603 Update#53/CLOSURE 2 10198 <br />