features in the cycling of the key radionuclides in both the terrestrial, groundwater and marine environments. Consequently, field research programs were implemented between 1972 and 1975 with support from Atomic Energy Commission (AEC) and one of its successor agencies, the Energy Research & Development Administration, (ERDA) and, since 1977, from the Department of Energy (DOE) to provide more reliable data for dose assessments for alternate living patterns at the atoll and to define transport mechanisms determining the fate of the radionuclides within the environment. Meanwhile in 1974, a master plan had been developed for Bikini that contained plans for the Phase II housing construction to begin sometime in the future. The planning was stopped awaiting advice from AEC on the best locations for the phase II housing. In November 1974 the AEC informed the Dept. of Interior of more recent radiological findings u and of the desirability of conducting a "follow-on" radiological survey since it appeared from the additional available data that the locations planned for some of the Phase II housing should be carefully evaluated in order to minimize external exposure. On March 7, 1975 the Secretary of Interior, Rogers Morton, outlined a survey plan to ERDA Administrator Roger Semans. Jr. A comprehensive radiological survey of Bikini and Eneu Islands was conducted to produce more precise information on external radiation levels in areas identified for additional housing and to provide data for estimating doses from the food chains for future residents of Bikini. The assessment based on the results of this survey indicated that Bikini Island living patterns could lead to doses that far exceeded the federal guidelines and that Eneu Island living patterns were very near the, guidelines. 8,9,10,11,12 However, no subsistence crops were available on