included in the cost analysis although the effort may not be required or may be required at a level exceeding our estimate. 3.) Ground and Cistern Water Samples Ground water and cistern water are both used for drinking and cooking although the preferred source of water is the rain water collected in the cisterns. Thus, it is necessary to sample these water supplies in conjunction with the vegetation, marine and soil sampling programs. Not only are the results of the analysis of these water samples used for direct input to the dose assessment but they also are very significant in delineating time dependence and cycling of radionuclides in the atoll ecosystem. On current residence islands or agriculture istands where there are established wells, sampling could be done concurrently with other sampling efforts. On current and potential agriculture and residence istands without wells, 5 man days of effort would be required to establish a well site based on past experience. Cistern and ground water studies at Bikini and Eneu islands at Bikini Atoll and ground water studies at Enewetak Atoll are part of current programs. Studies at other islands or atolls would have to fall under P.L. 96-205. 4.) Dietary and Consumption Habits A critical parameter in the dose models jis the average annual (or daily) intake of local subsistence foods. The pCi intake of all radionuclides is directly related to the amount of contaminated food product consumed. Therefore, it is most essential to have accurate information on the average 32