252 > RADIOLOGICAL CLEANUP OF ENEWETAK ATOLL FIGURE 5-27, SEALED BUNKER. The fourth troublesome Master Index item on Enjebi was a small, heavily reinforced, concrete instrument vault. The aggregate used in the concrete was primarily scrap metal, including nuts, bolts, and other hardware. A small portion of the vault’s surface contained beta contamination. Chipping removed this contamination, but exposed even more rusty, jagged metal. Attempting to remove this physical hazard by explosive demolition did not appear safe or effective. The vault finally was made safe by covering the entire structure with 6 inches of concrete. Debris cleanup was completed on 15 May 1979.79 Five hundred and thirty cubic yards of contaminated debris and 15,947 cubic yards of noncontaminated debris were removed. 80 SOUTHERN ISLAND DEBRIS CLEANUP With the completion of Lojwa Camp construction, Company C of the USAE wasreconfigured as a cleanup organization. The company returned to Enewetak Camp in two increments on 14 and 17 February 1978 to accomplish the tasks assigned to Team A in the OPL\N—noncontaminated cleanup in the southern islands. They began work on Medren on 15 February 1978 and on Enewetak Island on 13 March 1978,