The function of the Committee is to determine whether an underground burst of an A~Bomb that will rupture the surface to a substantial degree can be safely carried out within the continental limits of the United States, in the event that this is determined feasible, to recommend the site, and the meteorological, physicil, or biological data to be obtained as a result of the burst. At the meeting in Los Alamos, May 21 and 22, 1951, recommendations were made and criteria were established, At a subsequent gathering of certain of the Committee members, June 28 and 29, 1951, it was evident that some of the original criteria, and the recommendaticns should be reconsidered in light of additional data and studies developed by Dr. Gaelen Felt of the Los Alamos Scientific Laboratory (Appendix I). The - purpose of the July 13 mecting was to reconsider the recomacndations and criteria in terms of Dr. Felt's studies. The actual firing will be at the Nevada Test Site, some 25 miles north of Frenchman's Plat. The Yommittus agreed thet the 1.25 KT deep underground weapon would be unnecessary from a strictly rediological safety viewpoint. Furthermore, that the order of firing should be, first the surface and second the scaled sub-surface, The Committee reconsidered its criteria and they are as follows: A. Geological 1. A vasin at least partly enclosed by mountain ranges, in the expectation that the rise would tend to hold large particulate matter within the basin -- and additionally, to produce a. deposit of finer particulate matter on the far sides of the ranges by descending air currents, 2. A low level of ground water. The large amount of fission products in the crater will not be adsorbed and held because of the absence of clay, and hence may tend to migrate to the ground water and show up in water supplies of grazing stock. 3. lh. A soil predominatly silica. Preliminary studies should be made of soil chemistry and particle size distribution. For the test itself, there is required a deep unconsolidated mass of soil with q==ee=len an absence cf faulting in the area to be instrumented for ground shock.