ARCHIVED REPORTS XR0006421 - Laserfiche WebLink

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2 Volatilization to on-site outside air Groundwater ingestion was calculated for 1 On-site groundwater ingestion, commercial The groundwater located in the shallow aquifer (Zone A) beneath this site is not suitable for commercial or domestic use due to the dry cleaning solvent plume associated with Lincoln Village The site is situated at the southeast corner of Lincoln Village, which contains a dry cleaning solvent plume consisting of perchloroethylene (PCE), trichloroethylene (TCE) and I,2-di chloro ethylene (DCE) This shallow aquifer, that lies beneath R603, will be undergoing a massive remediation groundwater pump and treat project (Interim Source Area Remedial Investigation Report, Lincoln Center, May 22, 1998 —Levine Fricke Recon) 2 Off-site ingestion, Domestic The closest domestic well is 780 feet from the site and is cross gradient to the groundwater plume, and the closest down gradient wells is 3390 feet from the site Because the down gradient well is the only well likely to be impacted by the plume, a well distance of 3000 feet was used to calculate off-site ingestion CONCENTRATIONS USED In order to test the probable impact of the current groundwater plume the upper confidence level (UCL) concentrations were calculated for the Monitor Wells within the plume, from the September 16, 1998 sampling round The values used to determine the soil impacts were the highest values from the June 1997 conformation borings COMPOUND MILLIGRAMS/LITER WELL Benzene Water 0 005 UCL Benzene Soil 0 005 Detection limit Ethylbenzene Water 022 UCL Ethylbenzene Soil 0 18 Highest value SB5-65' TPHg water represented in 34 UCL the RBCA by Hexane TPHg soil represented in 87 Highest value S136-50' the RBCA by Hexane MTBE Water 0 029 UCL MTBE Soil 0 005 Detection limit Toluene Water 0 058 UCL Toluene Soil 0 005 Detection limit Xylenes Water 049 UCL Xylenes Soil 7 7 5137-50 10 R603 Update#54/CLOSURE 3 12/98