61 Figure 2-54. CHAPTER il, SECTION 3 Stations 311.02, 310.03 and 312.03 Under ConstructionMan-MadeIsland No. 3 two 60-poundrails 4’ into the coral at each end of the foundation wall. Soil conditions were more favorable for Station 311.03, Dog. The foundation scheme was similar to the other stations but footings were extended 2’ below natura] grade and no attempt was made to connect to coral. These footings had additional cover in that the final grade required several feet of fill on top of the natural grade. Stations 310.01, .02 and .03 were steel trussed with roof and siding of corrugated asbestos. The ends of the buildings were left open. The asbestos material was frangible and therefore could be shattered, exposing the steel framework in case the roof and sides were subjected to blast pressures; this factor became the basis for the foundation design and influenced developing the strength of the exposed steel framework. Figure 2-55. Stations 311.01 and 310.02 50% Complete - Man-Made Island No. 2 Page 2-71