CHAPTER 5,8 SURVEYS Survey requirements of the Project were based upon the Recon~ naissance of the Jobsite made in October 1948, The Reconnaissance Report treatment of survey requirements and schedules was based upon limited knowledge of the scope of work involved. It outlined horizontal and vertical control surveys covering the Project islands as known at the time, topographic and hydrographic surveys for design purposes, and the construction and as-built surveys that would be required as work progressed, The later course of the Project and the increase ir scope of work resulted in such expansion of the Project requirements that these early surveys became inadequate. Schedules for these surveys were set up in the Reconnaissance Report. Because of a decrease in allowable manpower at the Jobsite during the early stages, inadequate transportation, and increased design and construction requirements, these schedules were met in the over-all but were not met in detail in all cases. However, design information was submitted to the Home Office as fast as it was obtained, and control requirements were completed without delaying any features of the work. Available data for survey planning consisted of the Reconnaissance Report; the Report of the Engineer, Joint Task Force Seven; and certain Coast and Geodetic Survey charts of the Atoll. From this information, a proposed control network was laid out, and a priority of requirements for design information was schedules. HORIZONTAL CONTROL SURVEY . To meet the requirements of the Project, a scheme of second order triangulation composed of check figures was executed from a second order base line on Runit Island. The scheme extended northward to Bogallua Island and southward to Eniwetok Island, and the purpose of the survey was to coordinate local surveys on Project islands and to establish distances and azimuth between certain installations, Standard procedure aud specifications of the J. S. Coast and Geodetic Survey for second order triangulation were the criteria for the survey. The geometry of the scheme was checked by the Los Angeles Office of the Coast and Geodetic Survey before field work started, and the results of observing the scheme were checked by the same group as to procedure in January 1950. The scheme was so executed that it could be expanded to include the complete Atoll, and wherever possible the permanency of station locations was considered. All station markers on Project islands were referenced, but referencing of the two stations in the lagoon and on the sand spits south of Runit was not practical. 5-56