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Mamb 1"3 µ a ` Environmental Letter page Z Cleanup Plan Finalized In July 1992, DOE and EPA signed a Record of Decision that finalized the Livermore site cleanup approach. The selected remedy for the contaminated ground water is to extract and treat the water in order to • Prevent any exposure to people. • Prevent further migration of the contaminant plume. • Remove the contaminants and their subsurface sources. The contaminants will be removed from the extracted ground water using one or more of the following: uivaviolct iighvhydrogen peroxide oxidation, granu- lar activated carbon, ion exchange, or air stripping. For contaminated soils above the ground water, the contaminant vapors will be extracted by vacuum - induced venting. The vapors will be passed through a carbon filter to further remove the contaminants. 100 Z' CL 80 c 0 5 ppb MCL7\ The primary contaminants are trichloroethylene and perchloroethylene, used in the past as clean- ing solvents and degreasers. Fuel hydrocarbons, chromium, lead, and tritium are also being ad- dressed in the cleanup. However, no one is cur- rently being exposed to any of these pollutants. In fact, no one is likely to be exposed for almost 100 years, even if no cleanup action were taken. Figure 1 shows the estimated decline in the total Volatile Organic Compound (VOC) plume over the current cleanup estimate period of 53 years. Tne Record or Decision can be reviewed at the Information Repositories located at the LLINL Visitor Center or the Livermore Public Library. For informa- tion on hours, see page 3. A response to all public comments received on LLNL's proposed cleanup plan is contained in an appendix to that document. u 0 43 5C Time (y) Figure 1 Estimated decline in average concentration of total VOCs using the cleanup time estimate from the Feasibility Study. Putting the Cleanup Plan into Action Over the next 3 years, DOE/LLNL will prepare five reports (Remedial Design reports) that detail how the cleanup will be implemented throughout the various affected areas of the Livermore site. This month DOE/LLNL released a workplan and schedule for preparation of those documents. Comments on this workplan (called a Remedial Action Implementation Plan) from the regulatory agencies and the CWG were taken into account prior to its final release. The first Remedial Design report covers the existing treatment facilities (A and B) in the southwest and offsite plume areas. It was released for agency and CWG review last fall. The second design document is due to be released this spring. a