earth fill streamlining was used, The seismograph block was the same as for Station 771--5 inches square and deep enough to bond the block to the coral bed rock. These drawings were also approved by the User on June 28, 1950. Station 811 - Engebi; Station 812 ~ The Aomon Group; Station 313 Runit; and Station 814 ~ Eniwetok - AACS. These stations were radio bea~ cons, Originally it was thought that no H & N design or construction would be needed because the User was to furnish all requirements, However, on November 3, 1950 the AEC Resident Engineer requested a concrete slab 6 feet 6 inches by 7 feet 4 inches be set at each site, He also relocated the stations on that date. Station 821 ~ Engebi; Station $22 ~ Muzin; Station 823 - Teiteiripucchi; and Station 824 ~ Bokonsarappu.- AMC. These stations were a series of concrete foundations for aircraft sections undergoing test. Most of the sections were fastened to 8 inch beams, which were in turn bolted to the foundation. Each station had a group of six major foundations varying in size from 10 feet by 16 feet by 3 feet deep to 6 feet by 9 feet by 1 foot deep. Two smaller pads, 3 foot 8 inches square were also included. These 8 units were spread over an area of 181 feet by 14 feet. The tops of all the foundations were level with the ground. A dust palliative was specified for the area approximately 315 feet by 200 feet around the foundations, The original design data and sketches were furnished by J~Division on April 27, 1950. submitted revised sketches on May 5, 1950. The User's representative On July 3, 1950 the User de- leted three of the & inch beams and. several of the J-bolts which were embedded in the concrete, Station 825 ~ Engebi; Station 826 ~ Muzin; Station 827 ~ Teiteiri- pucchi; Station 828 ~ Bokonasrappu ~ AMC, These were the recording sta- tions for the 821 through 824 stations, Originally they were designated 82la through 8248, respectively, but on June 7, 1950, J-Division assigned the new number designations, The interior size of these four stations was & feet by 10 feet by 6 feet 6 inches; however, the materials and structural elements varied considerably depending upon the distance from zero, The closest station, 825, was reinforced concrete with all four sides, roof and floor slab 1 foot 4 inches thick. Access was through a 2 foot 2 inch by 5 foot 6 inch blast door. Station 826 was the same as 825 except the concrete thickness was only 12 inches. The floors of both these stations were approximately 3 feet 6 inches below grade, and the rest of the building was covered to the level of the top of the roof with earth. Stations 827 and 828 were far enough away from the blast center so that a wood frame building with 2 inch by 8 inch boards for exterior sheathing and roofing and 1/2 inch plywood interior paneling would suffice, All of the exterior was covered with a skin of aluminum sheeting. Because these wooden buildings were set 3 feet 6 inches below grade, it was necessary to use redwood framing and sheathing. The floor slab for Stations 827 and 826 was a concrete pad 10 feet 21/2 inches by 12 feet 21/2 inches by 12 inches deep. All four of the stations were equipped with a 9 foot 8 inch by 2 foot 6 inch wooden work bench and a 3 shelf rack 4 feet high and 3 feet wide. These recorder stations were connected to the 821 through 824 station by a 6 inch conduit so that the instrument cables 5-178