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Memorandum • .CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD • CENTRAL VALLEY REGION 3443 Routier Road Phone: (916) 361-5600 Sacramento, CA 95827-3098 ATSS: 8-495-5600 TO: J. Lawrence Pearson, FROM: Wendy L. Cohen Supervising Engineer Project Engineer C� Kenneth D. Landau Senior Engineer DATE: 23 March 1987 SIGNATURE: 1,,!, 1, L _n "V SUBJECT: MEETING SUMMARY, UNIVERSITY OF CALIFORNIA, LAWRENCE LIVERMORE NATIONAL LABORATORY SITE 300 (LLNL) , SAN JOAQUIN COUNTY On 24 February 1987, representatives of the Regional Board and LLNL met in Sacramento to discuss the status of several on-going investigations and programs at Site 300 (see attached roster) . Specifically, we discussed the tritium investigation, the ground water monitoring programs, and the high explosives (HE) wastewater lagoon closures. Bob Buddemeier of LLNL gave a presentation with slides on the tritium investi- gation which has been on-going since the summer of 1984. The last report was issued in December 1985, and a report discussing the work done since then is in the first draft stage. Work completed since the last report includes continued monitoring of soil moisture and tritium; aquifer testing anddetermination of migration velocities ; computer modelling to validate release mechanisms and predict future releases; and additional studies in the east firing area. A slide showing tritium concentrations in December 1986 indicated separate plumes from Pit 3, Pit 5, and Building 850. Additional work is planned for the short-term to characterize the plume in the east firing area, complete develop- ment and comparisons of aquifer test methods , continue monitoring, conduct additional studies at Pit 5 and Building 850, and identify technical issues relevant to remediation options. We discussed remediation briefly; Gene Draney of LLNL said he did not see why remediation would be required when the migration studies and computer modelling show the tritium will be decayed below levels of concern by the time the plume reaches a location to affect beneficial uses. Ken Landau stated that we will consider risk assessments, and casts and benefits of cleanup when determining what remediation is required, but we first need to know what technologies are appropriate and what their costs are. Fred Hoffman of LLNL said they are working on such evaluations and will report progress quarterly. At the meeting LLNL submitted the ground water monitoring report for the 4th quarter of 1986, and we discussed the overall ground water monitoring program. Connie DeGrange of LLNL said the report answers several questions we have had on past reports and includes statistical analyses for Pit 1 and for the Class II HE surface impoundments. She also said they pian to review the analyses being run at each of the landfills and will propose some changes in the near future to make the programs more uniform. The annual summary of 1986 ground water data will be submitted by 30 May 1987. r