5. Building 415. The purpose of this building was for temporary storage of nuclear components, It was a reinforced concrete structure, 2]'-4" x 25'-4" x 12'-6 1/2" average height surrounded by a sloping earth berm to the full height of the building and having diagonal wing walls for protection of the entrance. 6. Structure 419. This structure was the barge slip. It consisted ofa sheet-steel pile enclosed earth-filled mole, 81'-8" wide by 86'-8" long to which were connected two creosoted pile finger piers, each 20'-0O' x 132'-0" and separated 40 ft. to form the barge slip. Along the piers were laid the rails for the gantry crane, which had a capacity of 25 tons and a 37 ft. hook lift. Both sides of the slip as well as the slip proper were dredged to permit berthing of three barges at the same time. 7. 2.6.5 In addition to the foregoing buildings, a number of 8-man tents were erected for temporary offices, working space and storage. Because the Assembly Area was designated as an "Exclusion Area", it was completely surrounded by a security fence. A salt water well was constructed within the area to augment the normal water supply in case of fire. DECONTAMINATION In December 1952, when the construction requirements for test and supporting facilities in the Eberiru-Rojoa area becamefirm, the radiation levels in that area, due to previous tests, were such as to require decontamination measures in order to preclude over-exposure of personnel, In the area of the Eberiru crater, shown in Figure 32 (March 1953), the radiation level at this time was 50 to 95 mr/hr, necessitating close Rad-Safe control over all personnel required to work there. The radiation level at Rojoa was such that men could not be based ashore, and therefore an LCU fitted out as a houseboat was used to quarter and subsist the personnel. The most satisfactory method for decontamination of ground areas was the removalof all vegetation and the ground surface to a depth depending on the radiation level. Near the Ebériru crater as much as 12 inches of the earth was removed, The crater was filled and compacted with 77,490 cu. yds. of earth. For the campsite on Rojoa, approximately 53,785 sq. yds. were cleared to a depth of about three inches, then approximately 24,775 sq. yds. were backfilled with uncontaminated coralto a depth of about two inches. Due to having to quarter and subsist all personnel at Bikini Atoll afloat following BRAVO, it became necessary to provide a floating decontamination station for personal needs. This was accomplished by fitting out a 500-ton 63