om | SCIENTIFIC Page 2 JOHNSTON ATOLL 01042 POST -GO PROCUREMENT Remaining items. CONSTRUCTION The following facilities will be required on each of the two scientific platforms: Subtask A609 This project will require an 8 x 40 x 12-ft. high TC furnished instrument van on each platform. The total weight of the van will be 20,000 pounds. From points two feet above the roof of the van, an unob- structed line-of-sight above the horizon will be required 30° to each side of magnetic north and south. In the remaining 240° of azimuth, a line-ofsight will be required from zenith to within 5° of the horizon. Each van will require 17 kw of 120/208 volt (45%), 60 cycle, 3 phase electrical power. Subtask A804 A contractor furnished 10-ft. diameter astrodome witha motor driven door will be placed on a 2-ft. raised concrete pad on each platform. Five kw, 120 volt, 60 cycle, 3 phase power will be required. Subtask A963 A TC furnished 50-ft. triangular, self-supporting antenna will be erected on a reinforced concrete pedestal. The pedestal base will be poured in place on coral heads several feet below the water surface. The top of the pedestal or base of the towers will be 12-ft. above MLLW. One antenna will be located SW of the West Scientific Platform, Site 125, and the other located south of the East Scientific Platform, Site 124. Obstruction lights on both antennas will be provided by the contractor. Subtask A915 A 3 x 3-ft. concrete photo pad will be provided on the east platform. Two similar pads will be provided on Johnston Island; one will be located near the west wharf (91-3-117) and the other will be south of the new POL area (91-3-118). A telephone jack and 1 kw power at 110 volts, single phase will be required at each pad. In addition to the facilities provided for each project, a contractor furni- shed personnel trailer will be located on each platform. It will provide latrine and shower facilities and emergency sleeping quarters for eight men. A 4200 gallon capacity galvanized fresh water storage tank, on each platform, will provide water through a package-type hydropneumatic supply system. VOLI April 1909 1-50 diiiiiababtiataies