Stations 821 through 824 - Reinforced Concrete Slabs. There was no damage to these slabs; the design is believed to be adequate. Station 825. There was no damage to this structure; the design is considered adequate, Station 826 - Reinforced Concrete Structure. There was no damage to this structure except fine diagonal cracks above the door frame, which were probably caused by contraction. Design of this structure is considered adequate, Stations 827 and 828 ~ Wood Frame Structure. these structures. There was no damage to The design is considered adequate. DAMAGE TO PAVED AREAS Tower Sites, 3 inch Asphaltic Pavement within 400 foot Radius from Zero. The blast effect on the pavement in this area varied from total destruction in the crater area to a highly oxidized and badly cracked pavement at the outer limit. The heat from the blast vaporized the volative olis and burned the residual bitumen and aggregate to a cinderlike mass, At Engebi this mass is rather brittle and at Runit and The Aomon Group it is more friable. Most of this area is covered with a very fine dust. The shock waves created by the detonations completely shattered the pavement at Engebi in a very irregular pattern and buckled the pavement into ridges about eight inches in height throughout the area. Due to the friable condition of the material at Runit and The Aomon Group, the ridging and cracking were not pronounced. Tower Sites, 1-1/2 inch Asphaltic Pavement within 1,000 foot to 400 foot Radius from Zero. The blast effect on the pavement in this area varied from the condition at oxidized and friable mixture ridging at Engebi disappears pavement at all sites seemed radius line. In view of the the 400 foot radius described above to an at the 1000 foot radius. The shock wave about 850 feet from zero. The oxidized to become more friable near the 1000 foot fact that a substantial portion of the paved area withstood the effects of heat and blast, it is reasonable to assume that the paving was effective as a stabilizing agent. stabilization and Paving at Scientific Structures. These areas that existed outside of approximately a 1200 foot radius did not suffer any severe blast damage. The design is considered adequate. Airstrips. The only airstrip that suffered blast damage was at Engebi. This damage consisted of high oxidation of the surface and con- siderable cracking. The blasts (especially E+) covered the strip with broken concrete, coral, etc. Hlading and stabilization were required after the blasts to put the strip in an operable condition. 5-314