CHAPTER 11, SECTION 3 STATION: SITE: USER: PURPOSE: PARTICIPATION: DESIGN PSI: CONSTRUCTION: J-6002 Johnston Island ABMA Control Bunker J-40, J-41 1.5 psi 4-21-58/7-7-58 An earth-covered, re-inforced concrete bunker structure, this station was 43x53x10-feet high and had 12-inch thick walls, a 14-inch roof, and a 6-inch floor slab. The forward wall was 14 inches thick. The walls were supported on spread footings. There were four rooms within the building: two instrument rooms, a stand-by room containing Station J-70, and an equipment room containing Station J-260 and a latrine. There were cable ducts on the floor along three walls of each instrument room, along two walls of the stand-by room, and one wall of the equipment room. The ducts were formed by placing incre- ments of 314-inch-high angles on the floor to contain cables and to support continuous ply- wood covers. A concrete cable duct extended out of the building through the fill from the in- terior cable ducts. Cables from the bunker ex- tended from the duct to the firing pad and were laid in an earth ditch. afl eeeA The ceilings and upper half of the walls of the building were soundproofed through the use of acoustical tile nailed to wood strips em bedded in the walls and ceilings. Entry to th: structure was through a steel blast-resistan. door existing in stock at Jobsite. The design of the concrete at the door was modified to allov utilization of this door to expedite constructio1 and door fabrication time. Access to the top o the roof fill was accomplished by means of a wooden stair. A 3-foot-wide by 1-foot-higl double-plate glass window on the forward wal provided sight to the firing pad. The earth-cove. in front of the wall was sloped out of the line of sight. The building was air-conditioned and de humidified. Salt and fresh water required for the system was obtained from the existing water distribution system nearby and was piped int the structure. Electrical receptacles were provided along the cable ducts as well as on the walls. Lightin; of the rooms was accomplished with fluorescen fixtures. The fire protection system at thefiring pad was operated by a remote control located in the bunker adjacent to the window at th front wall. Steel rack supports were provided fo 25 instrument racks and were located adjacen. to the cable ducts in the building. fa i. (Neg. No. W-978-3-J) Figure No. 2-77 Page 140 Station J-6002 — 55% Complete.