of a concrete base 5 feet by 11/2 feet by 1 foot deep, the top of the concrete being flush with the finish grade. Stations 85a through f - Engebi - Bio-Med. On January 8, 1951, H& N received a letter authorizing these 6 additional stations which were the same as station 73, being a 4 foot diameter hole 4 feet deep into which an assembly furnished’ by the User was inserted and the hole then backfilled. Stations 90a through - Engebi; 9la through f - Muzin; Bokonaarappu; and 93a through d - Teiteiripucchi - AMC. 92a through d-~ The location of these stations was given on April 15, 1950, but the construction require- ments were not furnished until November 7, 1950. Steel boxes, 2 foot 6 inches cube, were designed and specified to be buried so that the cover was flush with finish grade. All of the stations had at least 2 inches of lead on one side, and some of the closer stations (90a, b, e, f, g, h) had 4 inches of lead across the front face and 2 inches along the two sides. On December 26, 1950, H & N was informed that stations 9lc, d, e, f, and 92a, b, c, d, were to be moved to Runit. These became the 95 series. An area 12 feet square around the boxes was stabilized with asphalt as per instruction from J-Division on July 17, 1950. Stations 95a through h - Runit - AMC, As stated under station 91 and 92, these stations were made up of units moved from Muzin and Bokonaarappu. The requirements and locations were furnished by the AEC on December 26, 1950. Station 95h was relocated by AEC on February 23, 1951. Asphalting of the adjacent area was not required for this group. Station 100 - Engebi, The Aomon Group, and Runit - All Users. These were the power houses and are covered in Chapter 5.15 of this volume. Station 101 - Engebi, Muzin, Kirinian, Bogallua, and The Aomon Group All Users. Timing signal and telephone cable termination stations were wood frame buildings with corrugated aluminum siding and roofing, The original size was 8 feet by 8 feet, but a field change by the AEC Resident Engineer on November 1, 1950, changed it to 8 feet by 12 feet. Stations 120a through e, and 12la through e ~- Engebi and The Aomon Group - Rad Chem. On July 10, 1950, J-Division fami ted an outline speci- fication and general dimensional sketch covering its requirements for Sta~ tions 120 and 121. Pressures for which these stations were designed were established by the AEC, It was required that the design be such that information could be recovered from the structure after the test. The User requested that the station be constructed of limonite concrete if possible. A preliminary study indicated that it would not be possible to construct it of limonite concrete with any assurance that the information could be recovered after the test. On September 26, 1950, authorization was received to fabricate these stations on the continent as steel castings and ship them to the jobsite ready for installation. Compartments and passage ways were required in the foundation for the castings. It was decided that these should be shop fabricated of steel plate and shipped to the Jobsite ready for installation in the concrete foundations. 5-169