428 RADIOLOGICAL CLEANUP OF ENEWETAK ATOLL effects of tides and stormson the containmentsite.>!.52 It was designed ty last only 2 years, until containment was complete.°3-54 Due to unforseen on-site changes, construction of the mole began 4 April 1978 approximately 9 monthslater than envisioned in the earlier planning. This late start did mot permit its completion prior to the beginning of containment operations. Construction of the mole wasinitially constrained bydifficulties in roc, deliveries from the quarry on South Runit. On | April 1978, the Pop quarry permit was amended to permit an additional quarry on the reer adjacent to Lacrosse Crater. Use of this quarry considerably reduced the haul distance and eliminated delays in crossing the hotline. The mole construction rate increased substantially after the new quarry was opened, Even so, the mole was only 20 percent complete when tremie operations began.55 When Typhoon Alice struck in early January 1979, the heavy seas and huge waves dumped large amounts of sand into the crater.56 Since the mole wasstill less than half complete, a fair evaluation of its effectiveness against such storm actions could not be made. To facilitate mole construction and debris cleanup, the CJTG recommended that the numerous contaminated concrete blocks near the north quarry be used in the mole.5? Field Command did not concur because of the contaminated nature of the material.58 Much later, however, approval was given to use rejected keywall sections of noncontaminated concrete in constructing the mole. Construction on the mole was completed on 21 October 1979, several weeks after the crater container had been capped.5? It was far enough along during the capping operations, however, to serve its intended purpose. The mole was subsequently improved to the extent that it would provide continuing protection for the containment structure. TREMIE OPERATIONS Dueto delays in starting soil cleanup, there were only about 3,700 cubic yards of soil in the Runit stockpile when tremie placement began.® The tremie facility consisted of a concrete pump which forced slurry through a 5-inch flexible pipe constructed across a floating footbridge to a crane mounted on a barge floating in Cactus Crater (Figure 8-21). The feeder pipe was connected to an 8-inch-diameter pipe suspended from the crane boom as a placementdevice (Figure 8-22). Cables anchored on the shore and connected to winches on each corner of the barge were used to move the barge about in the crater. The tremie mix was deposited into transit-mix trucks at the batch plant in the industrial area north of the hot line. The mix contained three bags of