including five Resident Inspectors, five Assistant Resident Inspectors, two Batch Plant Inspectors, one Electrical, and one Mechanical Inspector. The assignment of Resident Inspectors to the principal construction sites were not permanent inasmuch as maximum utilization of the skills and experience of the inspectors employed made it desirable to have them assigned at locations where work in their fields of specialty was at a maximum, The duties of the engineering personnel at the site, and of the inspection personnel in particular, included the interpretation of plans and specifications, It was, further, the duty of the inspector to determine that work being performed by construction forces was in aceordance with plans and specifications and that all inserts, conduits, equipment, and the like were properly installed. Checks of scaffolding, ladders, excavation shoring, and other construction activities were made to assure that unsafe working conditions were not tolerated, One of the major items of inspection involved supervision of concrete work, Each Resident Inspector was supplied with cylinder molds, a slump cone, and all necessary equipment for taking samples of concrete and making field tests in accordance with ASTM specifications. When forms were ready for the placement of concrete, an "Authorization for Concrete Pour" slip was issued by the Resident Inspector at the locality involved, The Foreman or Superintendent in charge of each phase of the construction involved was required to certify to the completion of the phase of work assigned to his group, eg., the completion of forms, placement of reinforcing steel, inserts, etc, Upon certification, inspection of the work was conducted by the Resident Inspector and if the work was found in accordance with plans and specifications, the "Authorization to Pour" was countersigned by the Resident Inspector. The type and strength of concrete to be used in the pour was entered on the slip by the Resident Inspector and this served as an order to the Batch Plant Inspector to supply the Batch Plant Operator with mix criteria to meet the strength specified, Upon completion of the routine described, one copy of each slip was distributed to the AEC Resident Engineer, the H & N Construction Manager, the Statistical Section of the Engineering Department, and the Test Inspection files. In December 1949, as part of the Jobsite inspection function, a materials testing laboratory was temporarily established in a rehabilitated quonset building on Parry. Initial equipment consisted of scales, a soil analysis screen kit, and two manually operated compression machines, In April 1950, the equipment was moved to Engebi to a quonset dugout where concrete and material testing was carried out under the direction of a Chief Technician. This move was deemed advisable because Engebi was the center of the major critical specification construction activity. In June 1950, a power-driven compression machine was installed and tested in the Parry laboratory, making possible the running of accurate compression and tensile tests, 5-30