. Foundation crews together with ncces=ry equipment and mterials were enroute to job site fmm Z. I. on 1 December, and on 6 December ground was broken at ‘~gobi Island for constmction of Zero Tower #l. During December, all land foundations on Engebi, Aomon} hunit, and Aniyaanii Islands for both Zero and Photo Towers were completed, By 12 January, at which time the steel erection crews arrived at the job sites, all steel had been spotted at sites and erection work was underway. Despite minor delays due to high winds and failure of winch motore, all towers were completed and passed inspection prior to 15 Mrch$ the deadline set for turn-over to AEC engineere. Field and Laboratory Test of Concrete and Concrete Materials Maj. J. M. DeBerdeleben. Organization. A concrete testing laboratory was set up on Ehgebi Island at the request of the Task Force Engineer who recognized the value of maintaining job control during construction and of determiningand recording the quality of the concrete placed. Test Set No. 13 (concrete)was provided by the Office, Chief of Engineers, to assure stateside concrete of a specific quality for the 0C13test buildings. Test Set No. 11 (soils) was provided by the Mth ConstructionCompany from their equipmnt. Engineer These two test sets were combined into a concrete test laboratory by Msj. J. M. DeBardeleben and Mr. R. C. Linthicum, the representativesof the Office$ Chief of Engineers. Concrete tests were zmde for all other types of concrete on the entire project as well as thoee for the CCE test buildings, Dr. Roy W. Carlson, consultant for tlm AEC, frequently used the laboratory 56 Section XVI