CHAPTER II, SECTION 1 As a result of the exploration borings and laboratory tests, the following general criteria were set up: (a) Structures which were not critical from a settlement standpoint were supported on conventional spread footings. (b) For structures where allowable settlerent was extremely critical, 12-inch steel H-piles from 40 to 80 feet in length were used. Figur2 2-2 shows 12-inch H-piles, 80 feet long, drive.i and capped. This foundation was used for Station 20. Detailed design criteria subsequently used proved adequate; the final results showed there was no appreciable settlement of any of the struct res beyond critical limits. WAV= ACTION STUDIES. A survey was made of the Bikini Atoll early in Aprit 1953 to determine wave conditions, wind conditions an-l ‘he relationship between wind and waves. The study also included cloud cover and current observations. Wave periods and heights were measured with a wave staff. This wave staff was of the type used by the U. S. Navy Hydrographic Office. The displacement of water on the staff from crest to trough was observed visually and logged as each wave passed. Wave periods and heights were recorded to the nearest half-foot. Wind speeds were taken with a hand anemometer from the highest point on the bridge of an LST. Wind direction was ascertained to the nearest 16th point of the compass. Currents in the lagoon were measured in the passes by computing the drift of wood blocks from an anchored vessel, and in the ocean b fixing the position of a free-floating wavestaff over a period of several months. Cloud cover was estimated visually by percentages in 10% increments. The results showed that the wind regime was very stable, with the prevailing direction as ENE with extreme observed directions of NE and ESE. The wind speed was between . .ur and 20 knots with the greater percentage botween nine and 19 knots. The mean cloud cover during daylight hours was 3.10. *.ow cumulus was present nearly always with arm average base height of 2,000 feet. It was found that the currents in all same knots at all of the passes were approximately of the velocity, the speed ranging between 0.5 anc 1.5 knots, without clange ir. direction tides.