82 CHAPTERII, SECTION 3 the foundation provided for securing the dectors. The foundations and pits were covered with a weather-proof enclosure made of light structural steel framing and corrugated aluminum sheeting and roofing. Located at the front of each foundation were four pipe support pedestals for carrying sight tubes. A causeway of standard Jobsite design, was constructed on the ocean side of the island in order to reach Station 2220.01. Station 2210 supplied the required 3 KW power. Sheeting and roofing were removed prior to and replaced after the Cherokee event. STATIONS: PURPOSE: SITES: USER: 2221.01 thru 2221.04 Lead Detector Station Sally (2221.01 thru .03) Ruby (2221.04) UCRL PARTICIPATION: 1, 2, 3 and 4 CONSTRUCTION: 4-21-56/4-27-56 These stations were lead detector assemblies and appurtenances which were approximately 4’-4” x 10-4” and 4’-8” high containing a lead wall in the center and protected by a concrete box-like structure. Four collimator pipe supports were required for each station. Stations 2221.01, .02 and .03 at Sally were located on an existing concrete slab. To obtain the required elevation, it was necessary to remove some of the concrete and reinforcing from the slab. For Station 2221.04, Ruby, a two-foot retaining wall was required on the ocean side in order to hold the required sand cover. High tides undermined the backfill; consequently, riprap was placed 15 feet from the station. The windward side of each station was protected by a temporary wall approximately 16’ x 23’. Two 2%” conduits were run from Station 2201 to each detector of Stations 2221.01 thru 2221.03. Ten direct burial cables were run from Station 2221.04 to Station 2201. A 5 KW gener- ator located adjacent to Station 2221.04 pro- vided the instrument and utility power at this station. A total of 94 cubic yards of concrete was required. STATION: PURPOSE: SITE: USER: PARTICIPATION: CONSTRUCTION: 2231.02 Connector Pit Sally UCRL 2 11-4-55/12-24-55 This station was a coaxial cable connector pit of concrete construction and was 7’x 8’ x 4’ deep with 11”-thick walls at the bottom taper- ing to 8” walls at the top. It was provided with ladder rungs, a wooden cover, pull rings, two 5” deep x 5-6” long slits at opposite ends, and was covered with earth fill. A total of six cubic yards of concrete was poured. CR’. . ae Figure 2-104. Station 2231.02 - 99% STATION: PURPOSE: SITE: USER: PARTICIPATION: CONSTRUCTION: OCCUPANCY: Complete 2250 Concrete Collimators Tare UCRL 22 11-4-55/5-23-56 3-22-56 This station was a reinforced concrete collimating baffle 24’ wide, approximately 2114’ high and 2’-6” thick, located 55’ east of the Station 22 working point. It contained three holes and one notch in the side for collimator sight tubes. These tubes were required to be accurately aligned with Station 22. Five 4” conduits were run from Station 22 to the underside of Station 2250. A total of 76 cubic yards of concrete was poured with an average 28-day strength of 3050 psi. STATIONS: PURPOSE: SITE: USER: PARTICIPATION: CONSTRUCTION: 2251.01 and 2251.02 Collimator Towers Sally UCRL 3 12-1-55/3-28-56 These stations were steel towers prefabricated in sections then erected to support lead collimating discs on a platform approximately 8’ square. Station 2251.01 was 12.5’ high and Station 2251.02 was 32.6’ high; both were erected on concrete footings. Both towers were dismantled for the Stations 1 and 2 events, then re-erected for the Station 3 event. To ensure stability of the tower legs during dismantling and re-erection, a #11 rebar rod was welded from leg to leg at the base. The Contractor Page 2-113