o About 105,000 cubic yards of soil contaminated with transuranics, principally isotopes of plutonium and americium, were identified, excised, transported by landing craft to Runit, and mixed with cement to form concrete with which Cactus crater was filled. This crater in the reef is about 350 feet in diameter and some 30 feet deep. The crater volume below sea level was filled by the tremie method, in which a concrete slurry is pumped by large hose and pipe to the crater floor, and progressively built up. Above the waterline, a soil-cement mixture was formed from the contaminated soil. A thick concrete keywall was constructed around the circumference, and a dome-shaped concrete cap covered the entire crater. o At the completion of the cleanup, of the 40 islands of Enewetak Atolls 30 qualified as residential and subsistence agriculture islands in terms of residual transuranic contamination; seven qualified as agriculture islands; two qualified as food-gathering islands; and the last one, Runit, had all identified high- level concentrations of transuranics removed. It remains quarantined because of residual sub-surface contamination. Every island designated in planning documents for a particular end-use by the people was cleaned at least to the level corresponding to that use; and for many islands--including, most significantly, Enjebi--the cleanup exceeded the planning goals. Costs have remained remarkably constant for the duration of the project. The effort has been completed within the $20 million MilCon funds originally appropriated for the task. When Congressional direction was received to accomplish the cleanup project with military forces without reimbursement, the first estimate of total project cost was developed by DNA during the Mobilization Phase and was presented to Congress in the spring of 1978. At that tire DoD costs were estimated at $80 million (including MilCon), Dol costs at $12 million, and DoE costs at $4 million, for an overall total of $96 million. Despite inflation, major increases in project scope, unforeseen difficulties, and damage and delay from four severe typhoons, current estimates today, more than two years later (and within a few weeks of project completion) are: DoD $86 million; Dol $14 million; DoE $4 million; for a total of $104 million. While this amount represents "value received" by the People of Enewetak in terms of cleanup effort, "out of pocket" cost for U.S. taxpayers is substandially less, because many of the DoD expenses would have accrued had there been no Enewetak cleanup (e.g., pay and subsistence for personnel, fuel and spare parts for vehicles). DNA estimates that the cost to the taxpayers of the Enewetak cleanup and rehabilitation program has been approximately: DoD $49 million (including MilCon); Dol $14 million; DoE $4 million; for a total of $67 million. Dol's rehabilitation program has involved the construction of [16 homes for the people on the three southern islands of Enewetak, Medren, and Japtan, along as