CHAPTER I!, SECTION 3 Requirements for these stations consisted of providing space in existing CASTLE Station 101, George, and in Station 1320, Dog. No construction was involved. Minus one minute andminus one second timing signals were supplied. STATIONS: PURPOSE: SITES: USER: PARTICIPATION: CONSTRUCTION: OCCUPANCY: 250.01 thru 250.03 and 251.01 Neutron Flux Detectors Charlie and Charlie-Dog Reef DOD-2 18 3-23-56/4-4-56 4-6-56 These stations were concrete foundations set flush with the ground except for 251.01, which was on the reef and set 12 inches above high tide. Each station was 6’ x 12’ x 3’ deep except for Station 251.01, which was 6’ x 21’ x 6’. A detector was mounted on a steel plate that slanted at an angle normal to the Station 18 height of burst. A total of 8 cubic yards of concrete, with an average 28-day strength of 4,450 psi was poured for Stations 250.01 thru .03, 18 cubic yards for Station 251.01. STATIONS: PURPOSE: SITE: 252.01 thru 252.11 Threshold Detectors Yvonne USER: DOD-2 PARTICIPATION: 7 These stations were User-furnished detectors clipped to the crossarms of Stations 1211.01 through 1211.11. (See description on 1211 station series. ) STATIONS: PURPOSE: SITES: USER: PARTICIPATION: CONSTRUCTION: 253.01 thru 253.06, 253.08 thru 253.13, 253.15 thru 253.29, 253.32 thru 253.40 and 253.42 thru 253.51 Threshold Detectors Tilda and Sally DOD-2 1 and 2 2-16-56/6-9-56 These stations consisted of various types of detectors. Type one was a 3”-diameter 4’-high standard pipe buried in an 8”-diameter concrete footing to a minimum depth of 4’. Type two was a 3” diameter, approximately 4’ high, standard pipe buried in a 2’-square by 4’-deep reinforced concrete block. Type three was a 3” diameter, approximately 4’ long, standard pipe buried in an 8” concrete footing 4’ deep. A 3/8” wire rope with 1” minimum slack was bolted at each end to retain the pipe after the blast sheared it at the base. Types four and five consisted of 1” plow cables laid on top of sandbags and sawhorses, respectively, both with User-furnished instruments attached. One-inch steel cable was used to assist in recovering the detectors, which were spaced at approximate 300-foot centers along the cable. Three runs of cable were utilized in conjunction with Station 1, and three runs with Station 2. Sandbags kept the cable in place. The detectors were raised 4’ above the ground by using wooden horses beginning at a point 900 feet from each zero station. Stations 253.42 through 253.51 consisted of detectors clipped to the crossarm of a pipe column set in the reef. The height of the crossarm was 6 feet above high tide. (For description of these stakes, see station series 1211.) A total of four cubic yards of concrete was poured. STATION: PURPOSE: SITE: 255.01 Neutron Effects Yvonne USER: DOD-2 PARTICIPATION: 7 CONSTRUCTION: 5-14-56/6-7-56 This station consisted of six boxes, each 3’ x 3’ x 3’ high with 6”-thick reinforced concrete top and side walls. The bottom was open and set in the ground to a depth of 6 inches. The top was made removable by the use of bolts. All boxes were spaced 3’ apart in an array approximately 750’ from Station 7. Box 1 was plain reinforced concrete; Box 2 concrete was User-furnished; Box 3 concrete contained 20 pounds of borax; Box 4 concrete contained 40 pounds of borax; Box 5 concrete contained 60 pounds of dry sulphur and Box 6 concrete contained 15 pounds of dry sulphur. All the boxes were made in the testing laboratory at Elmer to ensure proper mixing and curing. A total of 16 cubic yards of concrete was poured. STATION: PURPOSE: 257.01 thru 257.03 Neutron Studies SITE: Charlie USER: DOD-2 PARTICIPATION: 18 These stations consisted of soil samples placed in a depressed section of concrete within Stations 250.01, .02 and .03. STATION: PURPOSE: SITE: USER: PARTICIPATION: 261.01 Rocket Launching How DOD 11, 18 and 22 Page 2-67