250 ~ RADIOLOGICAL CLEANUP OF ENEWETAK ATOL, FIGURE 5-24. ENJEBI HILTON AFTER DEMOLITION. operations had created a continuousslab 10 to 12 feet thick at points of heavy loading. 76 Extensive radiological investigation of the base revealed only beta contamination, which was limited to the surface of the concrete. Approximately 150 square meters of the surface was contaminated. This was removed by chipping with air hammers. The surface was resurveyed, after which the entire base was buried under 2 feet of soil contoured to grade so thatall traces of the former landmark were eliminated. 77.78 The Enjebi Hilton was only one of four unusually difficult Master Index items on Enjebi. The second was a very large bunker on the eastside of the island. Portions of the face of this bunker were also contaminated. While the bunker was to remain in place after hazards were removed, the contamination had to be removed bysand blasting (Figure 5-25). Once the hazards were removed, the bunker would be usable as a storm shelter or covered storage area. The third item requiring major effort was another large bunker on the northwestern tip of the island. This bunker was to remain in place, but hazards were to be removed. While there was no contamination found on the bunker, the inside was heavily laced with pipes, electrical circuitry, motors and other equipment. The removal of all the internal hazards access. (See Figures 5-26 and 5-27.) ~~ removal of the entire structure. With the concurrence of the Enewetak Planning Council, all entrances were sealed with concrete to prevent owe would have required extensive effort and probably would have led to the