CHAPTER II, SECTION 5 by 31 January 1954. Actual work started on 28 August and was completed on 18 January 1954. STATION 2400.01 LIMONITE COLLIMATOR ON UCRL PIPE SITE SUGAR - USER: UCRL GENERAL. This Station was a_ reinforced limonite concrete structure used in Project 24 (Phonex). The upper pertion was wedge-shaped with an opening in the tup that tapered down in steps to an opening in the bottom. The block rested on a 23’-0” x 20-0" x 4’- 0” deep reinforced concrete slab. A six-inch slab extended beyond the structure at the rear and at the front. The front of the structure was provided with a dirt fill, and a three-toot high wall was provided in the front to hold this fill. In addition, there was a two-foot thick limonite concrete wall along the side at the front which acted as a shield and a retaining wall for the earth fill. A number of pipe sleeves were provided, some of which were located horizontally while others were located vertically. ENGINEERING. A portion of the basic design criteria was received on 6 May 1953. In this criteria it was stated that the engineering would be done by UCRL, and that the Contractor would supply the materials and cast the concrete. All of the basic design criteria were received on 8 July 1953, at which time the steel design for the structure was checked, and it was found that the design was inadcquate. After consultation with the User, the Station was re-designed. On 12 July 1953, the size of the slab was changed and minor revisions were received on 27 July which were incerporated on the drawings. On 17 August, criteria were received requesting that the wall at the side of the structure be limonite concrete and, in addition, the vertical holes in the limonite hlock were re-spaced. The design work proper was started on 29 July. The criteria required that this structure’s settlement could not exceed 1-inch maximum. As a result, a heavy foundation was designed which embedded the base four feet in the ground and which was supported by eight steel 12-inch H-piles. Two drawings were submitted on 3 August and on 8 September respectively. They were approved on 20 August and on 25 September, CONSTRUCTION. Work was scheduled to commence on 1 September and to be completed by 31 December. Actual construction started on 17 September and was completed on 2 Januarv 1954. The piling foundations for these Stations could not be driven because of the hard coral ledges underlving the Stations. After verifying the thickness and extent of the coral, an alternate design of a concrete foundation, doweled and grouted into the rock, was employed. "TS BT EEer a 4% Figure 2-167. Page 2-148 fee nme nee