0018933 ee Site Elmer rose to 25-30 mr./hr. The Fallout Prediction Unit was not able to establish definitely the origin of this material, but felt that there was some reason to think that it had come from Shot Fir. After arrival of the Koa samples at LASL, a dispatch was received in the field indicating that the cloud, and possibly the fallout samples, were heavily contaminated with Fir debris. The nature of the evidence was not knownat the time, but it was conjectured that sizable amounts of DELETED which was produced in large quantities in the Fir detonation, had been found in the Koa samples, Examination of the wind structures existing during the period of the Fir and Koa detonations indicated a possibility of some contamina tion of Koa fallout by Fir debris, but no mechanism was apparent that could lead to heavy contamination, When the radiochemical data became available it was found that all the Koa cloud samples contained some material from Fir, but not enough to appreciably alter the significance of the results (see Chapter 3). 223.3 Walnut Event. It was planned to project a total of 10 rockets into the cloud, 4 each from Sites Mary and Sally and 2 from Site Wilma, The launchers on Mary were set for automatic positioning by blue-box signal, SAN BRUNO FRC whereas on Sally and Wilma the quadrant elevations and azimuths were preset. After the shot the firing circuits to Sally and Wilma were intact, but the line to Mary was open, A firing signal was sent at H 4 10 minutes and 57