~ 12 ~ The first on-site and off-site reports were encouraging. The fallout was progressing to the east-northeast and crossed Highway 93 south of Alamo and north of Glendale, Nevada as predicted, In anticipation of this event, roadblocks had been established on Highway 93 at Alamo at 0715, and at Glendale at 0725. This prevented persons being directly in the fallout as it occurred, thus reducing the whole body exposure and the possibility of direct contamination of personnel and equipment. The roadblocks were re- moved at 0851 and the cars monitored after they had traveled through the area. Precautionary closing of Highway 91-93 between Las Vegas and Glendale had been ordered at 0735 and lifted at 0805. A precautionary roadblock had been established at St. Goerge at 0745 but it was not until 1130 hours that this roadblock was lifted. All in all, hundreds of cars were monitored and about 40-50 vehicles were washed (at Government expense) according to the established radiological safety criteria. Groom Mine was not directly in the path of the predicted fallout but since it was the nearest inhabited place ~ about 30 miles from ground Zero monitors were stationed there. At 0632 the radiation level rose rapidly to 140 milliroentgens per hour and the few inhabitants living there were asked to remain indoors. They were released at 0748 after the cloud had passed and the levels had subsided. DOE ARCHIVES At 0920 the radiation levels outside were 11 mr per hour and were dropping rapidly. Incidentally, there were other occasions when individuals or families located near the test site were temporarily relocated. Usually this involved from one to a dozen or so rs