the yield in cubic feet. June, 1958: For the first time operation Millrace is mentioned. as being a series in Nevada on which Liaison with Livermore is going on. No mention is made of LASL. It is said to be a series with five tests and several other one point safety shots and Sandia plans to participate with a number of projects, and in particular ground motion and other ground measurements on the largest tunnel shot, Evans. July, 1958: The first mention of the Jericho experiment, now scheduled for the fall of 1959 in NTIS with a twenty kt underground detonation is made. X-ray measurements in a tube to simulate a high altitude environment are to be performed. August, 1958: The Phase III authorization for Nike Zeus was received this month. ‘Sandia refers for the first time to the fall operation now called Operation Hard Tack Phase II which is presently to include eleven nuclear tests and seven safety tests. At present seven are to be balloon shots, three in tunnels and one on a tower. This report discusses Project Gnome for the first time with Sandia planning to participate in arming as well as strong motion studies. any plan to date. No mention is made of There is a brief appendix covering Teak and Orange with summaries of the results of Sandia technical measurements. chemical samplers were not successful on either shot. Note that the radio Furthermore, many of the measurements made by Sandia instrumentation were either unsuccessful or had questionable results, with .an estimated 50% success rate. In spite of this, Sandia wrote, "There seems little doubt that bursts like~Teak and Orange isolate