64 CHAPTER I1, SECTION 3 station also included a 3-inch pipe and working platform located at the 150-foot level of Station 1517, which was used for the installation of two User-furnished mirrors. Island power was supplied to each trailer. Timing signals.of minus STATIONS: PURPOSE: 811.01 and 811.02 Thermal Radiation Measurements SITES: George and How USER: DOD-8 PARTICIPATION: 18 CONSTRUCTION: 2-27-56/5-3-56 OCCUPANCY: 4-11-56 45 minutes, minus 15 minutes, minus 1 minute, minus 15 seconds and minus 1 second were provided. A total of 25 cubic yards of concrete was poured. These stations were User-furnished trailers 35’ x 8’x 12’ high and weighing 25,000 pounds. The space around the base of the trailers was sandbagged to prevent inundation. Steel cables were used to guy each trailer to four concrete anchor blocks. Power was furnished by two 75 KW generators. Timing signals of minus 45 minutes, minus 15 minutes, minus 1 minute, minus 15 seconds, minus 5 seconds, and minus 2% seconds, plus a special radio drop signal, were provided. The concrete poured for Stations 811.01 and .02 totaled 18 and 1814 cubic yards, respectively. All the pours 28-day strength of 2,500 psi. STATIONS: PURPOSE: SITES: had an average 812.01 and 812.02 Thermal Radiation Measurements William (812.01) and Wilma (812.02) USER: DOD-8 PARTICIPATION: 22 and 24 CONSTRUCTION: 4-9-56/4-28-56 These stations consisted of 25’ square working platforms and brackets for supporting mir- rors at the 3744-foot levels of photo tower Sta- tions 1513 and 1514. In addition, a steel instrument shelter located at the base of tower Station 1513, identical to Station 810.01 without the 10-foot mast, was required for Station 812.02. The shelter was covered with earth to within 1 foot of the entrance hatchway and Figure 2-59. sandbags were placed over the hatch cover. Power and timing for each station were furnished from steel instrument shelters. (See description of Stations 810.01 thru 810.03). STATION: PURPOSE: SITE: USER: PARTICIPATION: CONSTRUCTION: OCCUPANCY: 813.01 Thermal! Radiation Measurements Nan DOD-8 18 2-27-56/5-24-56 5-15-56 This station consisted of two User-furnished trailers identical to those described for Stations 811.01 and 811.02. They were located on an earth mound and guyed to four concrete anchor blocks adjacent to Station 70. This STATION: PURPOSE: SITE: Station 815.01 815.01 Thermal Radiation Measurements Yvonne USER: DOD-8 PARTICIPATION: 24 CONSTRUCTION: 4-7-56/4-23-56 This station was originally to be identical to Station 810.02 (instrument shelter) with a 30-foot-high mast. It was later decided to use the powerhouse as a shelter and mount theinstrument on its roof. The instrument mount consisted of a 6-inch-diameter pipe bolted on the existing slab and guyed three ways. Timing signals of minus 15 seconds and minus 1 second were required. Page 2-77