SCOPE OF REPORT: This Report will concern itself with installation and function of utilities and structures. It will report on, and evaluate existing facilities; and propose a definite program of design and construction. It will consider spec= ial problems of operation, and of mobilization, demobilization, logistics, and maintenance, It will make cost estimates based on suggestions, probabilities and schedules provosed in the Report. Scope of this Report does not involve detailed design. It is intended, however, to explore the possibilities from the standpoint of sound engineering principles, giving alternatives where feasibility of more than one method or design is apparent, and setting forth specific recommendations for policy determination which will form a basis for subsequent contracts or organizational work, as well as procurement and financial arrangements to accomplish the necesSary construction at the Proving Ground. It is intended to be sufficiently comprehensive that a person not wholly familiar with the vicinity of the proposed operations may proverly evaluate the recommendations given herein. The magnitude and extent of facilities discussed in this Report are based on our understanding of the requirements of the Laboratory at Los Alamos. Within a general framework of criteria derived from conferences at Los Alamos, this Report will develop engineering recommendations which are supported by such calculations and studies as will establish that the conclusions inthe Report are vracticable from the standpoint of engineering design and construction in the field. It is recognized that with the unprecedented scientific developments in the field of atomic weapons, it is impossible to make proving ground specifications today which will not be partially obsolete tomorrow. Great emphasis has been placed, therefore, on flexibility in problem analysis.