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Final Release LLNL Site 300 (USDOE) Two VOC plumes exist in the GSA, one in the eastern GSA and one in the central GSA. The eastern GSA plume has been treated to levels below drinking water standards off-site. Nevertheless, the TCE plume emanating from the central GSA still extends beyond the site boundary at levels above drinking water standards. Remediation of the central GSA plume source is on-going, and the off-site drinking water wells are currently unaffected by the Site 300 contamination. No contamination from Site 300 has ever been detected in off-site water supply wells. In our assessment, current and future exposure to these plumes is unlikely. Remedial Activities—Funding and Timeframe: Comments: Citizens commented: "What is being done to keep contaminants from going off-site? Is funding going to be adequate to continue the proposed monitoring programs?" "I have no immediate concerns; however, I would like to know when the toxic underground water plume will be completely cleaned up. Is there a progress report? Also, to the maximum extent possible, I would like work on radioactive and biologically active materials [to] be done further from major population centers." "The soil and groundwater contamination that has taken place at Site 300 needs to be cleaned up as soon as possible and should be an issue of the highest priority. The cleanup standards should be maintained or raised, and current timeframes for cleanup should be, if anything accelerated. I am concerned that while everyone talks and plans and re-plans, the contamination continues to exist, spread, and do its damage." "Finally, the hypocrisy of turning off cleaning equipment claiming that the area is cleaned up, but only because standards are lowered (I understand that's the new plan)." Response: LLNL and DOE have identified remedial activities for each of the eight Operable Units at Site 300. The major components include, but are not limited to 1. extracting and treating contaminated groundwater: 2. extracting and treating contaminated soil vapor where appropriate, 3. removal of tritium contaminated sand pile at Building 850, 4. implementation of exposure controls for site workers, the public and the environment, and 5. continuing monitoring of Site 300 and the immediate surrounding area. A-3