eR unit (Yvonne) Cleanup and Crater Containment QUALITY CONTROL AND RESULTS if there was an evident shortcoming in the construction portior ect, it was in the quality control standards and procedures Prnis Crater container. Someareasof quality contro] were well ex ce example, directions and procedures for insuring that comer as for concrete used in the keywall and dome were adequate, ; rests were documented. A total of576 concrete cylinders weretesti ests averaged 5,354 poundspsi with a high of 8,401 psi and a low o asin indicating a quality of concrete far exceeding the 3,000 psi requirement. Penetrometer tests of the soil-cementreflected | strength consistently in excess of the required 300 psi. On the othe no single individual was tasked with overall responsibility for assuri: compliance with the design specifications and adherence construction schedule or sequence, or for providing continuity, gu and supervision throughout the keywall and dome construction. DI? designated, as the DOD Project Manager, to be the desig construction agent to supervise the execution of the project, !4! which normally would havefallen to the Corps of Engineers on at construction project. In delegating responsibilities to Field Con DNA was specific in the guidance for coordinating the preparat plans and conducting the cleanup and assuring timely and ac logistical support services.!42 However, there was noclear-cut del of the responsibility for providing professional civil engineer con guidance, and expertise. Some at Field Command believed that D! retained this overseer responsibility. Others felt that it would be ex through the establishment of the JTG, with its engineering sectic the designation of an engineer officer to be the JTG comn Consequently, formal procedures for exercising this technic: engineering responsibility were not institutionalized. When spe technical expertise was required, the JTG generally would assistance from POD. As tremie operations were being completed in February 1979, H¢ tasked Field Command to establish a quality control program for c and soil-cement in order to assure the durability of the conta structure for a long period of time.!43 The CJTG reported that ac quality control program had been implemented in October 1978, a concrete cylinders were being tested. !44 In the concrete quality control program, the need to establish a of controis during the tremie phase was not adequately highligh related earlier, some oversize material and debris were pus bulldozer into the edge of the crater. Diver checks could not inst these materials were fully encapsulated in slurry or that a monolith