2. 2) R. W. Buddemeier, C. Gatrousis, and A. H. Bierman, "Alpha-Sensitive Cellulose Nitrate Track Detectors: Applications to the Study of Environmental Contaminations," submitted to the Plutonium Information Conference, NAEG, 1978. 3) R. W. Buddemeier and W. A. McConachie, "Fallout Tritium as a Long-Term Tracer for Atoll Soil-Water Processes," (abs.), submitted to the International Symposium on Isotope Hydrology, IAEA, 1978. 4) Hawaii press, 1978). Institute of Geophysics Data Report (in Scope: The general objectives remain as stated in the initial proposal; the description and quantitative understanding of the hydrology and groundwater geochemistry of Enewetak Atoll, and the use of these results to interpret groundwater radioactivity in terms of leaching, cycling, transport and residence time models, both for the groundwater-soil-vegetation system of specific locales, and for the atoll as a whole. The initiation of clean-up and rehabilitation operations has significantly altered the environment of Enewetak Atoll, and added new problems and opportunities for study. Specifically, the principal objectives for FY 78 will be: 1) Investigation of the effects of denudation of the islands on the hydrogeochemical regime. LLL (Noshkin) studies are expected to address the radiological aspects of the effects “on ground- and soil water of the bulldozing and burn-off of the vegetation from Enjebi and other islands, while Robison's group continues to investigate vegetative recycling of radionuclides. The UH effort will be directed toward a study of alterations in the recharge rate of the groundwater, and chemical changes occasioned by lack of plant activity and the breaking of the plant-soil recycling path. Both of these may be expected to increase the leach rate of soil radionuclides, and the artificial denudation of the islands therefore represents an outstanding opportunity to investigate the recycling and leaching mechanisms. 2) Investigation of the effects of the Runit I. encrypt- ment of radioactive scrap. In addition to monitoring the integrity of the containment, the encryptment will draematically alter both the surface and subsurface hydrologic regimes of the island. Although direct study will probably have to planning await completion of the clean-up, we. expect for this contingency during FY 78. to be 3) Monitoring the effects on water quality and subsurface storage caused by withdrawal of water from the airstrip wells on Enewetak (for laundry supply) and the Japtan wells used by the Enewetak people.