4. Detailed analyses and breakdowns of each feature contained in every cost estimate which the Atomic Energy Commission approved for construction, in order to provide the Jobsite Management and particularly the Construction Department with the estimated total quantities to be used in connection with the preparation of progress reports. CHANGE ORDER ESTIMATES Change Orders in connection with this contract constituted orders covering those changes in approved plans which the Atomic Energy Conmission Resident Engineer at Eniwetok determined were necessary. It should be recognized that these field changes were made amd Jobsite engineering change orders were issued only after an extensive review of Jobsite conditions indicated that a change in design, an addition to design, or a deletion from design was advisable in the best interests of the over-all Contract. A copy of the Change Order containing Jobsite estimated costs of materials, labor, and equipment usage was forwarded to the Estimating Department, Los Angeles; upon the basis of this information, a formal estimate including all direct and indirect costs was prepared in accordance with standard estimating practice, The estimate for each particular Change Order was assembled in order to show the total net direct and indirect costs divided between material, labor, equipment, and transportation; and it was then formally transmitted to the Atomic Energy Commission at Los Alamos. During the period covered by this Completion Report, more than three hundred change orders of this type were issued involving a total of $1,440,405. SUMMA RY _ All of the above noted types of estimates were periodically sum- marized for the purpose of contract modification, Table 12,3-1 shows such a tabulation for June 30, 1951, indicating AEC authorizations of increased construction involving cost only and scope only.