deemed necessary, He cast at least three 6 inch by 12 inch cylinders from each structure where concrete was placed and no less than six eylinders from each 100 cubic yards of concrete placed in any one building at any one time, In addition to the more routine duties outlined above, the Test- ing Laboratory was called upon from time to time for assistance in the accumulation of data required by the many agencies interested in the Proving Ground. Thus, for example, in connection with the Military Structures Program data on soil bearing values were obtained at the direction of the AEC Resident Engineer for analysis and evaluation by others, In addition, the Laboratory assisted in recording of results on a series of test holes drilled in the vicinity of certain designated Navy Structures under the supervision of the Navy representative. Because of its importance in connection with construction requiring massive, high strength concrete, the Laboratory conducted a series of experiments directed toward the design of high strength concrete mixes, Results thus far obtained indicate that a 4000-pounds per square inch specification can readily be met using local materials and that even higher strengths may be possible, Extensive experiments were performed to determine the effects of sea water and brackish well water on concrete, These experiments indicated very little if any impairment of the compressive strength of the concrete, With sea water, the action was very much like that in high early strength cement, the concrete gaining 80 per cent of its twenty-eight day strength in seven days. With orackish well water, the seven day strength was not quite so high, but the twenty-eight day compressive strengths were equal, The 6 inch by 12 inch cylinders used in the above experiments were cast from identical mixes, the only difference being the source of water. However, before any absolute conclusion can be drawn, further experimentation using water from both sources should be conducted, The Paving Inspector sutmitted two daily samples of the finished paving to the laboratory for testing. This testing was conducted in accordance with ASTM Specification D-244-49, Some of the equipment used in the laboratory had to be improvised, and although this added somewhat to the difficulty of testing, very accurate results were obtained, At the close of each day's work the Resident Inspector at each site submitted a report to the Principal Engineer in charge of the Inspection Test Section, setting forth in detail the construction accomplished. This report explained what problems were encountered and how they were solved or referred the problems to the Principal Engineer for action, It included figures for the number of yards and specified strength of concrete placed, lineal feet and size of reinforcement steel, square feet of forms built, cubic yards of aggregate crushed, square yards of pavement laid, and all other data pertinent to the day's activity. A copy of this report was then passed to the 5~32