SITE INFORMATION AND CORRESPONDENCE

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t Mamh 44i Environmental Letter page,2 Cleanup Plan Finalized In July 1992, DOE and EPA signed a Record of The primary contaminants are trichloroethylene Decision that finalized the Livermore site cleanup and perchloroethylene, used in the past as clean- approach. The selected remedy for the contaminated ing solvents and degreasers. Fuel hydrocarbons, ground water is to extract and treat the water in order to: chromium, lead,and tritium are also being ad- dressed in the cleanup. However, no one is cur- Prevent any exposure to people. rently being exposed to any of these pollutants. In • Prevent further migration of the fact, no one is likely to be exposed for almost 100 contaminant plume. years,even if no cleanup action were taken. • Remove the contaminants and their subsurface sources. Figure 1 shows the estimated decline in the total Volatile Organic Compound (VOQ plume over the The contaminants will be removed from the extracted current cleanup estimate period of 53 years. ground water using one or more of the following: ultraviolet light/hydrogen peroxide oxidation, granu- The Record of Decision can be reviewed at the lar activated carbon, ion exchange, or air stripping. Information Repositories located at the LLNL Visitor For contaminated soils above the ground water,the Center or the Livermore Public Library. For infotma- contaminant vapors will be extracted by vacuum- tion on hours, see page 3. A response to all public induced venting. The vapors will be passed through a comments received on LLNL's proposed cleanup carbon filter to further remove the contaminants. plan is contained in an appendix to that document. 0 100 a CLs 60 e 0 60 e 0 �j 40 0 e`o 20 <' S ppb IMCL7\ 0 ------ ---------------- v 10 20 30 40 s0 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 Plan)from the regulatory agencies and the CWG were reports (Remedial Design reports)that detail how the taken into account prior to its final release. The first cleanup will be implemented throughout the various Remedial Design report covers the existing treatment affected areas of the Livermore site. This month facilities(A and B)in the southwest and offsite plume DOE/LLNL released a workplan and schedule for areas. It was released for agency and CWG review last preparation of those documents. Comments on this fall. The second design document is due to be released workplan (called a Remedial Action Implementation this spring. a