-7- Water was pumped from the wells, filtered, and sampled. Radionuclides, major elements, nutrients, and bacteria measurements were made at the Lawrence Livermore Laboratory to provide data for water quality. Specific wells were pumped continuously over a day and serially sampled to follow the changes in water quality as a function of usage. The well network, is available for resampling on subsequent trips we plan to the atol] to thoroughly assess the dynamics of radionuclide cycling in the ground water reservoir and to maintain a surveillance of the water quality. The program operation was fashioned after our Enewetak ground water study and comparison of the data from both atolls should be especially valuable for predicting the mechanism and rates of constituents in ground water at Pacific atolls. A complete report on the Bikini and Eneu ground water sampling and analysis has been published (4). Plant/Soil Sampling Program Purpose: The main thrust of the program was to determine radionuclide concentrations in food species; to correlate these with soil concentrations at various depths; to determine nuclide availability to plants in the coral soils; and to relate the radioactivity in food-species to that in indigenous nonfood species which have the potential to serve as indicator species. The unique information that this survey provided is: 1. Soil-to-plant and soil-to-fruit concentration factors for detectable radionuclides. 2. The relationship between food species and nonfood species at the same location. 3. Intra-island variability in vegetation radionuclide concentrations. Sig 05582