activity in any area should be recuced to less than an eight-hour daily dose. (b) Two feet of coral sand over the present craters should reduce present radioactivity to a sufficiently low level for all construction purposes. The few hot spots observed outside of the crater area may be removed by bulldozing the material to the edge of the island and covering with sand, in such a position that the lagoon will not be contaminated. (c) The vrobable intensity of radioactivity in the craters by 15 May will be such that men can work in the craters for 3.4, hours on Engebi, 1.2 hours on Aomon, and 0.5 hours on Runit per day without exceeding a tolerance dose. For men in bulldozers working from the outside toward the center, these times may be appreciably longer. It should be sufficient to assume that a man will be able to work in this way for a half a day. The only shot island paved around the tower in the last experiment was Engebis The pavement is badly shattered, and samples taken of this pavement are intensely radio active; however, the soil under the paving is relatively uncontaminated, indicating the shielding effect of the paving. Monitor results during this reconnaissance are available at the Los Alamos Laboratory. Condition of Foundations under Original Shot Towers. The original towers were evidently placed on concrete piers, which are understood to extend about nine (9) feet below the ground surface. The towers have completely disappear= ed, with the exception of a few pieces of metal in the crater area, which might be identified as pieces of tower structure. The tops of the concrete piers have suffered some degree of shattering, and in some cases, this is con-= II-5