16 was laid first, and each panel was keyed to the abutting panels[tc Prevent differential displacement (Figure 6). Contaminated debris remaining after the “donut hole" was fijied was Placed into two concrete “boxes” constructed for the purpose an attached to the landward side of the dome. The material within the Cactus Crater, covered by the concrBte cap, consists of about 105,000 cubic yards of contaminated soil enclésing some 6,000 cubic yards of miscellaneous debris. The dome has shalice slope and has been used as a landing pad for helicopters. The concrete key-wall around the dome is protected on the ocean sidB wave action by a riprap "mole"--a necessary precaution during struction phase because during the three-year cleanup operation] major typhoons and tropical storms hit Enewetak Atoll causing destruction. One typhoon required complete evacuation of the 3.10 ick from the con- four tensive ll. References Atomic Energy Commission, Enewetak Radiological Survey, Report NVO-140, AEC-NV, 3 yvols., AEC, Washington, D.C., 1973. Report by AEC Task Group on Recommendations for Fleanup and Rehabilitation of Enewetak Atoll, AEC, Washington, D.Cd, 1974. Defense Nuclear Agency, Environmental Impact Statement--Cleanu Rehabilitation Resettlement of Enewetak Atoll-—-Marshall Is3ands, 5 yvols., DNA, Washington, D.C., 1975. 1980. - Fact Sheet-~Enewetak Operation, DNA, Washington, JD.C., . The Radiological Cleanup of Enewetak Atoll, DNA, Washington, D.C., 1981 Ristvet, Byron L., Summaryof Drilling Operations, DNA, Washington, D.C., 1980. Sateln tate te a aes