248 RADIOLOGICAL CLEANUP OF ENEWETAK ATOLL wells, and miscellaneous scrap. Only the base camp islands exceeded Enjebi in the amount of noncontaminated debris. There were an estimated 19,884 cubic yards of noncontaminated and 568 cubic yards of contaminated debris to be removed. There were 166 Master Index items. plus the largest amount of unexploded World War II munitions to be found on any island on the atoll. 73 The debris survey began in July 1977 and continued, with occasiona| interruptions, well into the next year. Based on the Master Index, 3,309 cubic yards of debris were classified for crater and lagoon disposal and scheduled to be physically removed from Enjebi. Resurvey of the concrete items in early 1978 identified an additional 7,700 cubic yards to be removed from the island, including concrete pads, bunkers, and anchor blocks comprising 3,200 cubic yards of material and the multistory building at Greenhouse Station 3.1.1, nicknamed the ‘‘Enjebi Hilton.’ The Structure was coded in the Master Index for on-island disposal; however, the resurvey found beta contamination on the roof. This contamination and the immense volume of other material contained in the building made on-island disposal impractical. The resurvey identified over 75 percent of the structure, some 4,500 cubic yards, for lagoon disposal. These changes required more time and resources for Enjebi debris cleanup than originally planned. The principal impact was on the Army Element and the Navy Boat Transportation Team. 74 Debris cleanup began at Enjebi on 26 January 1978. The first major project was to raze the Enjebi Hilton, a multilevel building 52 feet wide, 196 feet long, and 36 feet high. [t had been constructed in three sections to test the effects of nuclear blast on various types of materials and construction techniques commonly used in commercial buildings in the United States. Though still standing, the building had been severely damagedin the tests (Figure 5-22). After the FRST discovered that the roof contained extensive beta contamination, the contaminated portions were chipped loose and transported to Runit for containment. The roofchipping operation was completed on 4 March 1978 and, on 13 March 1978, USAE began demolishing the remaining structure with a wrecking ball. The technique was effective but slow. After extensive study and planning, it was decided to use explosives and demolish one section at a time. After a test blast on 21 March 1978, the first section was dropped on 29 March 1978 with 2,000 pounds of explosive charges.’5 The remaining sections were demolished the following week with two similar explosions, leaving only the concrete base (Figures 5-23 and 5-24). Several months were required to remove the rubble. The base of the Enjebi Hilton posed a difficult problem. It was 7 feet thick with l- and 2-inch diameter steel reinforcing rods. There wassoilcement, as well as a lean mixture of concrete, under all footings. Grouting