233 Debris Cleanup moved onto a pier from stockpiles using either a dozer or a loader and loaded onto the barge by a crane which was prepositioned on the barge (Figure 5-14). The barge was then towed out to the dump site, secured to the buoy marking the site, and offloaded with the crane (Figure 5-5). Normally the loading/offloading consumed 8 to 10 hours for each operation. This method was used to move most of the debris from Medren from November 1778 to May 1979. The last and most efficient method of transporting noncontaminated debris employed a BC-type barge with a bulldozer aboard. This method was developed for use at Enewetak Island where there was a substantial cargo pier and a large volume of debris identified for lagoon disposal. Numerous innovations were necessary to achieve maximum efficiency in the loading operation. One was the removal of dump beds from uneconomically repairable 20-ton dump trucks. These beds could easily be moved to and from stockpiles by a tractor-trailer in a loaded/unloaded configuration. Debris-loaded dump beds were emptied onto the barge at Enewetak with 45-ton or 90-ton longboom cranes (Figure 5-16). By judicious placement of loads on the barge, much higher capacities were reached. Up to 700 cubic yards were loaded on a barge, with average loads of 500 cubic yards. Loading time ranged from 4 to 6 hours. Offloading took less than an hour with the bulldozer pushing the debris off the barge at the lagoon disposalsite. tee, | oes pt OR 2 ee cis FIGURE 5-14. DEBRIS LOADING ON A BARGE.