68 an entrance tunnel 7’ x 7’ and 18 long with 2foot-thick walls. Station 1315 was 12’ x 16’ x 14’ high with 3-foot-thick walls and an entrance tunnel 6’-6” x 6’-6” and 5 long with 2-footthick walls. Station 1315 was connected to Station 1310 by 14 6-inch conduit and to Station 1316 by 14 1-inch conduit. Both stations were covered with approximately 8 feet of earth fill for shielding. Entrance to each station was by means of a heavy steel blast-resistant door at the end of the access tunnel. Power requirements consisted of 0.3 KW, 120-volt, single- phase. Two phone jacks were required and 7 pair of signal wires were extended to Station 1315. SITE: CHAPTERII, SECTION 3 Yvonne USER: LASL PARTICIPATION: 6, 7 and 24 CONSTRUCTION: 12-6-55/4-21-56 This station was a 27’ x 7x 4’-6”-high reinforced concrete shelter divided into five cubicles by walls 1 foot thick. The cubicles were 3’ x3’ x 3’-6” high except for the end cubicles, which were 3’x 4’x3’-6” high. The foundation slab was 3 feet thick. The exterior of the walls was 2 feet thick and contained stirrups as well as other reinforcing. A detector head was mounted in each cubicle at an elevation of plus 17 feet. Each cubicle had a removable cover of reinforced concrete 12 inches thick, with eyebolts installed to facilitate handling. An open slot in the front and rear walls of each cubicle permitted detector heads to have an unobstructed line of sight to Stations 6, 7 and 24. Located on each side of the detector cubicles and 4 feet from the exterior walls were two 36’-7” x 13’ concrete bins with heights varying from 8’ to ¥6” for one bin and from 9’-6” to 10’-2” on the other. One bin contained ten 12’”-diameter steel pipes with the bottom row of 5 pipes oriented on the working point of Station 24 and the top 5 pipes oriented on the working point of Station 7. In the other bin were five 12-inch pipes oriented on the working point of Station 6. The reference point from whichall pipes were oriented was the detector head within each cubicle. The bins were filled with coral sand. A 414”- diameter 4”-thick lead stopper was supported in the outside end of each pipe by a styrofoam plug, cut to fit the 12” pipe. Three cubicles had two 4’-diameter conduits and the two end ones had four 4” conduits leading to Stations 1315 and 1310, respectively. ~~ et Figure 2-71. Station 1315 - 85% Complete A total of 86 cubic yards of concrete, with an average 28-day cylinder break of 4,201 psi, was poured for Station 1314, and 80 cubic yards was poured for Station 1315. On pouring concrete for Station 1314, it was noted that the conduits were spaced too close together to allow the large aggregate to pass between them, so it was decided to use grout up to the level of the top of the conduit and place concrete the remainder of the way. This procedure proved satisfactory and assured a good tight bond around the conduit. STATION: PURPOSE: 1316 Detector and Collimator Station Floor drains were provided for the cubicles. The pipe alignment for this station was intricate in that it involved two different angles cut on each end of the pipe sleeves for lining up the working points of both the stations and detectors. At the point of convergence, it was necessary to cut the pipes and weld the ends together to maintain alignment. A total of 461 cubic yards of concrete was poured with an average 28-day cylinder break of 3,177 psi. STATION: PURPOSE: SITE: USER: PARTICIPATION: 1317 Alpha Recording Station Janet DOD-13 5 The rehabilitation of existing GREENHOUSE Station 132-B was started for this Operation and known as Station 1317. This station was to be used for recording purposes in conjunction with Tower 5. Coaxial cable was Page 2-85