Roger Ray, NV (702) 295-3553 FTS 575-3553 September 5, 1984 Draft Letter to the Secretary of the Interior Dear Mr. Secretary: This is in response to your request that the Department of Energy update its 1979 evaluation of the habitability of Eneu Island in Bikini Atoll and inform you of what conditions, if any, should be imposed upon a population which may resettle on that island. | Since the writing of the May 15, 1979, letter from Assistant Secretary Clusen, referred to in, your letter to me, we have continued our environmental studies at Bikini Atoll and elsewhere in the Marshall Islands. We have a high degree of confidence in the technical data upon which our evaluations are made, There remain uncertainties, especially regarding human behavior (viz: What is likely to be the composition of the diet of a resettled Eneu population?) and some unknowns, especially as to the response of individuals to given doses of radiation. Customarily, these latter--the unknowns--are dealt with by building conservatism into our radiation protection guidance. The behavioral uncertainties can be treated similarly--that is, by adding yet another degree of conservatism in the application of the guidance, as was done some years ago in setting criteria for the Enewetak cleanup at 50 percent of the annua} DTO1H DRAFT Page 1--9/5/84