CHAPTER I!, SECTION 3 fa ny ag =r re Figure 2-37. STATION: PURPOSE: SITE: Station 22 - 83% Complete 23 Ground Zero . Irene USER: LASL CONSTRUCTION: 12-17-55/4-26-56 This station consisted of two steel tanks, one inside the other. The inner tank, made of 5/16” boiler plate, was 15’ in diameter, approximately 15’ high and was watertight. The outer tank was 50’ in diameter and approximately 30’ high so as to maintain 10’ of water over the inner tank. The outer tank required a 1/4” thick welded steel plate floor. A heavy structural steel tunnel equipped with watertight doors connected the inner and outer tanks. Thefloor of tons was required for a lead shield located within the outer tank. Six three-inch I. D. pipes used as collimators in connection with Station 1612 and a tapered rectangular pipe used in connect- ion with collimation of Program 12 detectors were connected between the inner and outer tanks. Three runs of project-furnished Am- phenol RE 57 U cable and eleven runs of co- axial cable terminated in Station 1611. A 14’ x 14’ tent and 6’ x 8’ wooden building for housing vacuum pump equipment and instruments were erected outside of the outer tank. the tunnel was capable of carrying a movable Settlement of the station was critical. A special soil investigation led to the decision that the Station should be supported on a concrete mat and that the outer tank and access tunnel should be filled with water to ensure settlement the outer tank with sea water within six hours. equipment. With the mat founded on compacted two-ton load. Means were provided for flooding The inner tank was equipped with a revolv- taking place prior to the installation of soil and the tank empty, a bench markelevation ing bridge crane with a hook height of 12 feet above the floor and a hoist capacity of 2 tons. was established 150 feet away, and initial elevations at the quadrants of the mat were deter- foundation to the smaller tank. To exhaust this hours while filling the tank and continued thereafter until the settlement was 1/1000 of a foot An air intake was run under the large tank air, a vent pipe was extended above the waterline of the outer tank and turned down 180 degrees to within eight inches of the waterlevel. A foundation capable of supporting 100 Page 2-54 mined. Settlement readings were taken every 12 in that period of time. Thereafter, the readings were taken every 24 hours until settlement was constant, at which time the tank was emptied. Readings were taken while the tank