_ 1. 40 ww . TELECODIER TO: forty Ben Mal Hollister cS - a, SO? 21ST Hr te Toy ENIRSY - a ‘ Sl noah 1603 Tes Pe OES Wirector, Division of Operational and Environmental 20 Depontnent oF Enerey , Sy Washington, O0.C. 20545 GT , Pacific Noctaweat tal caters Evttcile Houlevard Recland,Wrest atu F402 felephane ($09) W. J. Bair Manager, Environment, Health, and Safety Research Program Battelie, Pacific Northvest Laboratories Richland, WA $9352 Teles 32-6345 The Enewetak Advisory Group met con April 26 and 27, 1878 in Denver, Colcrado. Present were: W. L. Templeton, C. W. Francis, 8B. W. Wachholz, J. Healy, R. 0. Gilbert, R. C. Thompson, R. 0. McClellan, and wW. J. Bair. The purpose of the meeting was to consider the following questions: oo 1. Is it possible to develop dose-related cleanup guidance that would assure that doses to future residents of Enewctak Atoll would not significantly exceed proposed EPA guidelines for transuranics? 2. What aavice can be given te the Defense Nuclear Agency on May 3, 1978 to facilitate planning for cleanup of transuranics on Enewetak? 3. What additional information.canebe obtained that could improve the confidence of the dose estimates and cleanup criteria for transuranics? 4. Can plowing be used as an effective cleanup measure for transuranics in soils? The Advisory Group reviewed information and data provided by DOE-Division of Occupational and Environmental Safety, Lawrence Livermore Laboratory, DOE-Nevada Operations Office, and Defense Nuclear Agency and offers the following respénse to the above questions. (This pertains only to transuranic elements and does not consider radiation doses from other radionuctides which, the Advisory Group understands, will delay the resettlement of some of the islands for many years.) Veo . The Enowetak Advisory Group does not find it possible to develop reasonable cleanup quicance that would assure that radiation doses from transuranics to future residents would not significantly exceed proposed EPA guidelings. Obviously, the more stringent the cleanup criteria, the greater the dearce of assurance; but uncertainties inherent in our present understanding of the problem precluds absolute assurance. One cannot predict with certainty the contamination levels that will exist in the islands after cleanup--this aust be determined at @ future time. One cannot predict the lifestyle and dietary habits of every individual who returns to the islands. Perhaps most important, many of the factors that are involved in movement of -transuranics in the environnant and the deposition and retention of. transuranics in human beings are not wel) established. us DeerArch ves 2% CoeBeal Collechow