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Memo' to J. Lawrence Pearson -2- 23 March 1987 We discussed LLNL's proposal for quarterly reports that include not only ground water monitoring results, but also progress reports on several on-going studies. Studies to be included are the tritium investigation, HE lagoon closure, Pit 6 assessment, and TCE investigation at Building 834. This would delete the need for interim reports on these studies, but final reports still will be required by mutually agreed-upon due dates . We discussed all the due dates LLNL cur- rently has by going through a list Wendy Cohen had compiled. Listed below are the major due dates we agreed on: Report Due Date Quarterly Ground Water Monitoring 30 Apr 1987 and Progress Report Tritium Investigation Interim Report 30 Apr 1987 Pit 6 Assessment Final Report 30 May 1987 SWAT Proposal 1 Jul 1987 TCE Investigation Final Report 15 Jul 1987 Quarterly Ground Water Monitoring 30 Jul 1987 and Progress Report We discussed the HE lagoon closures and the Toxic Pits Cleanup Act (TPCA) Hydrogeologic Assessment Report (NAR) which is due 17 August 1987. Mr. Hoffman said all data collected will be presented in the first quarterly report which is due 30 April 1987. He also said he is writing us a letter explaining that the investigation was expanded from the May 1986 closure plan and, therefore, will be submitted later, but the letter contains no date for a final report. Ms. Cohen said LLNL should submit the data now and follow the closure plan which states if no contamination is found, the ponds would be backfilled and con- sidered closed. This probably is the case for most of the lagoons, and for the others, a plan should be submitted to set cleanup levels and remove contami- nation or make a case for, leaving it in place. Ms. Cohen said there is no reason to wait on that portion of the closure while the study of HE in the ground water at the Class II surface impoundments proceeds. In a telephone conversation with Ms . Cohen on 5 March 1987, Mr. Hoffman agreed with this assessment and said all data will be sent to us by the end of March with a plan to close most of the lagoons. The letter will include the rationale for leaving all soils in place, filling in the ponds, and capping each one. With respect to the TPCA HAR, LLNL provided Camilla Williams with a letter which stated the additional sampling she required at the HE lagoons and surface impoundment will be completed by 15 June 1987. LLNL expressed confidence that the results will show the facilities are not subject to TPCA and no HAR will be required. WLC:jj