stations 73a through h - Engebi, The Aomon Group, and Runit, and Sta- tions 74a through h - Engebi, The Aomon Group, and Runit - Blo-Med. The User furnished the assemblies; H & N's portion of thework was to dig holes 4 feet in diameter and 4 feet deep and backfill around the assemblies. Originally no H & N drawings of these stations were anticipated except for location, but it later developed that one was required to show a pipe sup- port. Station 74h was relocated twice, once by the AEC Resident Engineer on October 23, 1950, and then again on February 9, 1951, by the AEC. station 75 - Engebi and Aaraanbiru; Station 76 - Muzin and Piiraai; Stations 77a and b - Kirinian; Station 78 - Runit and Kirinian; and Sta- tion79 _- Runit and Bokonaarappu - Bio-Med. The first sketches for these stations were received on February 16, 1950, from J-Division. The "final" revisions were submitted on March 28, "1950, by AEC, On April 12, 1950, J-Division submitted some additional corrections in the building as well as new locations. Revised sketches were submitted once again on May 22, 1950. Approval was again given on June 27, 1950. The User, on Septem- ber 25, 1950, requested that the buildings be insulated. On December 28, 1950, Station 77 on Kirinian was split into two stations, Stations 77a and b, both of which were to be mounted on rafts. Station 78 on Runit was also transferred from a ground base to a raft base at the same time. On January 4, 1951, an investigation by H & N showed that the standard Navy type raft that had been proposed by the User was not buoyant enough to keep the stations above water level. On January 17, 1951, approval was given to add drums or pontoons to the rafts in order to increase the buoy- ancy, The original work order left the type of material to be used to H & N's discretion. Station 75 on Engebi and Aaraanbiru had the highest pres~ sure loading; it was therefore necessary to use 12 inch thick reinforced concrete walls and roofs. The inside dimensions were 4 feet by 20 feet by 5 1/2 feet high. Station 76 on Muzin and Piiraai, being farther back, had 8 inch concrete walls and roof. The other stations had wood framing with a skin of aluminum sheathing on the exterior to protect the occupants against the elements and flash fire due to the test. Where physically possible, buildings were to be oriented to within ¥ 15 minutes of the specified azimuth, Stations 80a. b, c, and d — Engebi and The Aomon Group, and 80e - Muzin and The Aomon Group - Bio-Med. The assemblies were furnished by the User, but the concrete slabs were drawn and constructed by H& N. The details were furnished H & N on June 27, 1950, by J-Division. The concrete slabs were 4 feet by 12 feet by 1 foot deep. On October 21, 1950, the AEC Resident Engineer deleted Stations 80e on Engebi and Muzin. 1950, he relocated Station 80d, Engebi. On October 23, Station 81 - Engebi, and Station 82 - Muzin- Bio-Med, Each of these stations was a combination of one station 72and one station 80, the resulting concrete base being 25 feet long and 10 feet wide for 13 feet of the length and 4 feet wide for the remainder. Stations 83a, and b - Engebi - Bio-Med. Each station consisted of a 4 inch aluminum pipe embedded horizontally in the middle of the long axis 5-168