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Soil samples collected during the UST 834-DlU1 tank closure will be analyzed for <br /> EPA 8015 TPH-D and EPA 8010/8020 compounds. The presence of TCE and diesel <br /> detected in ground water suggests that these compounds will be detected in the <br /> soil samples. <br /> The excavation resulting from removal of the underground tank and piping <br /> must be filled as soon as possible. The fill must be selected and compacted to <br /> prevent infiltration of precipitation and/or surface water. Failure to do this may <br /> result in mobilization of the perched ground water TCE/diesel plume. <br /> Excavation to remove potentially contaminated soil that is in addition to <br /> excavation to remove the tank, piping, and associated fill, is not authorized by <br /> this plan. Excavation to remove potentially contaminated soil must be approved <br /> by the LLNL Environmental Protection Department (EPD) Environmental <br /> Restoration Division (ERD). ERD began remediating subsurface contamination <br /> beneath the Building 834 Complex in 1988 as part of remediation system pilot <br /> testing. Remediation at the Building 834 Complex is continuing as part of the <br /> ongoing CERCLA RI/FS process and CERCLA Removal Action under the <br /> guidance of the U.S. EPA, Department of Toxic Substance Control, and Regional <br /> Water Quality Control Board. The Removal Action involves ground water and <br /> soil vapor extraction and treatment. Should additional soil contamination be <br /> detected during the excavation, additional soil vapor and/or ground water <br /> extraction wells may be added to the existing treatment system. <br />