CHAPTER II, SECTION 4 site of the former OPERATION GREENHOUSE camp at Ursula for 200 men. This permitted the re-use of the existing slabs and, there- fore, the same plans could be used in construct- ion of the facilities; also, the existing fresh and salt water lines, as well as the sewer lines could be rehabilitated. The airstrip on site Tilda was placed in serviceable condition by 15 February 1953 to provide L-13 plane transportation to and from site Elmer and Fred, although H-19 helicopters were used mostly due to the convenience of landing directly at the Ursula camp site. In July 1953, the campfacilities were expanded for a 250-man camp. Figure 2-42. Airstrip Under Construction CONTRACT ITEM NUMBERS A-25 THRU A-25.7 - PETER-OBOE AIRSTRIP GENERAL. The Airstrip for Bikini Atoll was located on sites Peter and Oboe (these sites heing joined by a causeway) and consisted of a runway constructed partly on land, partly on reef and partly on causeway fill, 150 feet wide pilus 25 feet on cach side for shoulders and $500 feet in length. Four helicopter landing mats were included. The operation buildings are covered under Contract Item A-35. ENGINEERING. The purpose of this camp was to provide living quarters for the personnel engaged in the construction and outfitting of Scientific Stations on Sally, Olive, Ruby and Tilda, and for the construction of the causeway connecting these sites. The original design requirements as to camp facilities remained essentially the same as for OPERATION IVY, requiring only minor modification. ENGINEERING. The purpose of this facility was to provide an air terminal that would be capable of accommodating the landing of a C-47 plane which would be used for regular scheduled flights of men and materials hetween Eniwetok and Bikini Atolls. This facility also furnished air facilities for intraisland travel by helicopter. The Field Engineering Division prenared five field sketches and one drawing. One drawing showing the general iayout of facilities was prepared by the Home Office. CONSTRUCTION. Construction on the Airstrip was started on 25 October 1952, and by 27 January 1953 a 3500-foot portion was opened for the first test landing and take-off, using a Navy PBM. The halance of the Airstrip was completed on 20 May 1953. Regular scheduled flights were started on 25 May with flights four days a week; on 13 June they were increased to six flights a week. Figure 2-42 shows the Arrstrip under construction and status of work as of 7 April. Figure 2-43 shows surface grading. Additional facilities were added. including ¢ <tending the runway 1400 feet, airstrip marhi :g andsigns, and installation of arresting gear tor jet planes. Figure 2-44 notes the Airstrip with all these additional facilities completed. CONSTRUCTION. Work was started in the early part of January 1953, and the camp was opened for occupancy on 6 July 1953. The final rehabilitation of the camp facilities was completed on 15 October 1953. Figure 1-9 is the plan cf the camp as completed. CONTRACT ITEM NUMBERS A-31 THRU A-31.14 - URSULA CAMP CONTRACT ITEM NUMBERA-32 - FILL CRATER - SITE RUBY GENERAL. At the beginning of OPERATIC:.N GENERAL.A detonaiion on site Ruby during OPERATION GREENHOUSEcreated a crater. CASTLE the decision was made to use te Pace 2-70 Figuce 2-43. Airstrip - Surface Grading