CHAPTER 5.26 ENGINEERING SERVICES FOR USERS Because installation schedules for Users came at the end of the construction phase of the Project, representatives of Users arrived at the Jobsite relatively late in the course of the development of the Proving Ground, These representatives called for a considerable number of serv— ices which had not been anticipated and for a number of changes in construction either completed or in progress, The majority of these additional services or changes were provided by the labor pool provided for the Job 5 support program, but many made necessary the provision of engineering services. For example, the firing party required help from the Mechanical and Electrical Departments in planning and supervising the removal of tower equipment and the closing down of power plants just prior to experiments; scientific agencies required Design and Drafting Department help for drawings, charts, and prints; and several Users required field and calculation work by the Survay Department. An outstanding example of late changes and redesign was in the case of coaxial cables, As late as the latter part of February 1951, the Kleo trical Engineering and Survey Departments had to issue supplements to practically all coaxial cable layout maps, changing ditch sizes, widths, and layouts, and specifying additional trenching for selector stations, etc, Just prior to the tests additional fill cover was called for, Considerable field engineering was required as well to analyze new additional power requirements of Users, For instance, major equipment additions in the photo laboratory required electrical and mechanical engineering to provide adequate continuity of power and satisfactory humidity for photographic work. These additional requirements occurred during the spring of 1950. Revisions to the commmications, control, and signal requirements which occurred after the installation was started in the fall of 1950 required engineering liaison amd coordination, and engineering estimates for User services required consideration of availability and cost of materials, labor, and equipment, and many man—-months of field engineering were expended in fulfilling this requirement. Throughout the Job 5 phase, the Engineering Division provided advice and assistance to the AEC and the scientific Users, as well aa to the Construction and Operations Division of H & N in the solution of many electrical, mechanical, structural, and civil problems resulting from Job 5 work orders. 5-303