CHAPTER I!, SECTION 1 was critical at this time and represented the governing element in the completion of the de sign program. The final completion of design for the DOD program was complicated by the long period of time that ensued from the mailing of preliminary drawings until receipt of their approval. However, very satisfactory progress was made in January 1956, and by the middle of February 1956, the design of scientific sta- tions was practically completed. By the first of March 1956, all drawings which had not been tolerances of critical structures; effects of wave action and preventive measures against inundation; special blast doors; and particularly, interpretation of mode of blast loading under various circumstances, which frequently result- ed in the requirement of heavy blast resistant walls and earth covers. The electrical problems included providing dependable power supply at remote installations capable of a continuous unattended operation, approved by the J-6 Division of LASL had been forwarded to Jobsite for review and ap- with precise voltage regulation for instrument power; shielding instrument rooms against Ground. Authorization for construction in such and records; and providing signal and telephone proval by the J-6 representative in the Proving cases was obtained from the Manager, Eniwetok Branch Office, and signed reproducibles were forwarded to the Home Office for distribution. All original tracings of scientific facilities were forwarded to Jobsite so that revisions and “asbuilt” changes could be made directly thereon by the field forces. The major structural problems encountered in the design of the scientific stations were concerned with settlements and movement transient currents to ensure accurate readings distribution networks, both submarine and sub- terrainian, for the coordinated timing of ali de- vices and equipment associated with an event, and for reliable communication systems. Mechanical problems included furnishing facilities for the removal of heat generated by scientific equipment in areas with imbherently impaired circulation; humidity control; air conditioning; blast protection through self-latching devices for exterior openings; quick closing shutters actuated by explosive or electrical releases; precise alignment and tight vacuum retention of pipe arrays: pressure water systems to maintain water supplies for an extended period; hydraulically actuated opening devices and snubbers; high pressure air and fuel systems; tower elevators, elevator hoists and trailers for portable elevator hoists; ventilation for the removal of fumes and explosive vapors; and expendable and nonexpendable equipment. The major Civil Engineering problems primarily consisted of those connected with close location tolerances, the over-ail relation of sta- tion positions with each other, the extension of the primary triangulation net and soil stabilization, A concept of the size of the engineering effort is conveyed in the following record of drawings and sketches issued: civil - 110; architectural - 136; electrical - 407; mechanical 241; structural - 631. When the design of scientific stations was first authorized in March 1955, a total of ten men from the Home Office base engineering staff were employed on the Proving Ground Project. Personnel were added as the work load increased and during the peak of activity there were 78 men assigned to this work. During the peak of activity, it was necessary to place this engineering staff on a 50-hour week; in a few instances, it became necessary to place part of the staff on a 58-hour week. Due to the rela- tively short peak load period and because of the serious shortage of engineering personne} throughout the country, it was impracticable to recruit clear and hire additional personnel to eliminate the overtime involved. Page 2-2