Station 7 - Site M, Southegst of Runit, Plireai, Bokonaerappu ~ NRL. This was a wooden building 9 feet by 9 feet by 8 feet placed in the general vicinity of the photo towers (Station 60), Preliminary sketches were fur- nished on January 31, 1950. Because site M was placed on the coral reef, the site M Station was deleted as of March 14, 1950, and not reinstated until June 14, 1950, When it was reinstated; a designwas sent to the field showing the building supported on four concrete piers, the floor of the house over 4 feet above high tide level, An exterior skin of 0.032 inch aluminum sheeting was provided to seal the building against the elements. Stations 8 and - Engebi. The Aomon Group, and Er- NRL. The Tenex collimators were furnished by the User; however, these blocks (81 inches by 60 inches by 55 inches) had to be supported in fixed orientation with respect to zero, The support brackets for the collimators were made of built up H - beams, webs and flanges being 1 inch by 10 inch plate, fabrication of these was cempleted on June 6,. 1950. On dune 2, 1950, The locations of U-boltes that held the collimators and the adjustment screws that centered the unit were changed by the User, Final criteria for the bases was received on October 8, 1950, at which time J-Division informed H&N that it was permissible for’ Station 8 to roll, whereas Station 9 had to remain in place, In order to prevent Station 9 from moving, 13 cubic yards of concrete were required at Engebi and 34 cubic yards at The Aomon Group and E+, The whole assembly was surrounded and covered by prefabricated limonite blocks, The stations were relocated on November 16, 1950, by the AEC Resident Engineer, Stations 10, 11, 12, 14, and 15 - Engebi, The Aomon Group, Runit, and E+- LASL. These structures were also collimating blocks, They were supported in the same manner as those at Stations 8 and 9, Allowable tolerances for bases were 15 seconds of arc from a line through zero and = 6 inches of distance from zero, The volume of these foundations varied from 13 cubic yards to 48 cubic yards, depending upon distance from zero. Station 16 was + only the cable and samplers attached to the cable that was extended from a winch, Station 17, No design was necessary, but the location of the cable line had to be fixed in order to avoid interference with and shielding of samplers. Station 18 - Engebi, The Acguon Group, Runit, and E+~- LASL. In order to wash the cable and samplers of Station 16, it was necessary to provide a salt water pump station with an adjacent well, To protect the pump, which was rated at 200 gpm, at 50 psi, it was neceasary to build a blastproof concrete building 4 feet by 6 feet by 6b feet. The protection was necessary because the pump was needed for a few hours after test times and it would not have been feasible to haul a pump to the site and set it up. The hose provided a coverage of 200 feet ahead of Station 17. Stat ~- The Aomon G 10, 11, 12, ld, and 15, 5-158 t. and E+. LASL. Same as Stations