67 telephone and signal systems. The main signals terminated at a panel from which distribution was effected to the surrounding stations. Communications with the Atoll system were established through four telephones connected to the panel. Three local telephones were utilized for communication with the zero station, a mirror house, and a vacuum pumpstation. The dehumidification system comprised two 103,000 btu,hr refrigerant compressors with two 27-gpm water-cooled condensers mounted above one of them. Five ceiling-mounted de- CHAPTER II, SECTION 3 to ensure a firm bond between the coarse and fine aggregate. Also, whenever possible, inspection windows were used to reduce the free fall of concrete, thus reducing separation. The 34 E ransome paver was used on large pours in conjunction with the mixer trucks, thus ensuring a continuously uniform flow of concrete. Difficulty with closing the blast-proof doors was also encountered as they were too heavy for the hinges. It was necessary to shim under the hinges to bring the doors up level and to bevel the blocks for locking to ensure securing them. humidifiers were provided; one in Room B, two in Room C and two in Room D. A primary air coil of 64,000 btu/hr at 300 fpm face velocity was installed in the primary air inlet. Two vertical-type, centrifugal, self-priming, 54-gpm pumps located outside of the station were utilized in circulating salt water for cooling to the condenser units. The ventilation system consisted of a 12- inch round air inlet duct leading to a primary air fan of 600 cfm, which discharged into a sys- tem of ducts leading to the various rooms. A 20-inch square air filter was fitted in the air inlet; a 600-cfm exhaust fan was installed in the utility room. Electric room heaters were provided as follows: Room B, one 10 KW unit; Room C, four 7.5 KW units; and Room D, two 3 KW units. A coax dryer assembly wasinstalled in Room D. A total of 4,058 cubic yards of concrete was poured with a 28-day average strength of 3,936 psi. Difficulties were encountered with pouring concrete for this station due to the depths of the forms and the closely tied reinforcing steel, both of which caused a large amount of separation. This situation was over- come by pouring a 3-to-6-inch layer of grout first, in order to absorb separated aggregate and eh ‘iy Figure 2-68. STATIONS: PURPOSE: SITE: Station 1311.04 - 20% Complete 1311.01, .03, .04 and .05 Alpha Detector Stations Yvonne USER: LASL PARTICIPATION: 6 CONSTRUCTION: 1-4-56/5-25-56 Each station was a reinforced concrete Lshaped building 25’-4” x 21’ x 19’-6” high with walls and slabs 5 feet thick and a 5’ x 3’ entrance corridor. For the most part, double layers of reinforcing steel and inclined stirrups were used. A 2’-6’-square blast door in the end wall provided access. The stations were precisely located along the lines of coaxial cable covered with fill to a depth of 15’. Upon approaching the station, the fill was increased so that no less than 5’ of cover was maintained over the building. The fill extended to a point approximately 30’ beyond the station. Each station had three detect- Figure 2-67. Station 1310 - Room B- During Construction or heads mounted on a concrete pad that was approximately 20 feet above the coaxial cable and rested on top of the fill The detector mounts were within 1 inch of their specified locations in relation to the zero stations with which they participated. All detectors from the stations were connected to main runs of coaxial cable which eventually terminated in Page 2-83