CHAPTER I, SECTION 1 at EPG, the total population supported by H&N reached a peak of 5280 on 22 Apmil 1958. Early in 1958 a Technical Facilities Coordination Group of TDY personnel from Home Office Engineering arrived at Jobsite to assist in expediting the scientific program. This group consisted of Project Engineers and other engin- eering personnel who were constantly in touch with User groups and were familiar with their requirements. The mission of this group was to gather all design requirements of the Users and coordinate their accomplishment through the field engineering design forces. At this same time, ships and planes were unloading men, equipment, and supplies into the main camp at Elmer in enormous proportions; warehouses and open storage areas in all camps were utilizing all available space, and the lagoons at Eniwetok and Bikini Atolls were receiving additional craft daily. In an attempt to expedite the support program, the supply facilities at Nan were revamped to provide full accounting for all materials at Bikini, and Supply Coordinators were assigned at all off-island camps for more effective control of materials needed at these locations.In order to realize maximum utilization of the craft on hand, air and marine transportation systems and schedules were established, and facilities were expanded to provide transportation for the large influx of Task Force personnel. By mid-January 1958 a major portion of the Barge Station requirements were known, and construction was in full swing to meet readi- ness dates for their use. Because of changes in criteria some revisions were necessary, mainly in the Pinex-type Barges. A significant facet of Operation HARDTACK wasthe large-scale use of Pinex Barges as Ground Zero Stations. The construction of these barges is explained in detail in Chapter [V, Section 2, Marine Operations. Although faced with additional barge and LCU station requirements late in the program, afloat stations were completed on schedule. New barge assembly facilities were constructed at Nan and were utilized to the fullest for final assembly and device loading for the UCRL program. The barge construction program presented numerous difficulties due to shortages of certain materials which prevented continuous construction effort on any one barge. This situation necessitated considerable movement between assembly areas and moorings in the lagoon. The major Ground Zero Stations, +20 on Yvonne and +21 on Gene, were readied in time for the CACTUS and KOA events respectively, along with all satellite stations in connection with these and other events. Other stations were finished to the point where they could be quickly brought to completion for future events. The Scientific Station construction program for the CACTUSevent was completed and in the readi- ness stage on D minus 1-Day, with the camp at Yvonne rolled up and evacuated at that time. After the Janet camp wasrolled-up for the KOA event, further activities consisted of the support (Neg. No. W-V-208-5) Figure No. 1-6. Aerial of Pinex Barge in Drydock. Page 25