112 Figure 2-152. CHAPTER II, SECTION 4 Drilling at Station Site - Man-Made Island No. 2 OFFSHORE SALLY. In order to properly locate Station 1, a 110’ x 170 man-made island was constructed that was connected to Sally by a 21%x70 causeway, all of which was built to an elevation of plus 9.0 feet. The construction was similar to that of the other man-madeislands. ACCESS CAUSEWAYS. Land access between the islands in the construction, and other projects undertaken on the reefs at the Proving Ground, were subject to frequent shutdowns because of tidal conditions or storms. The equipment used was fre- quently awash and therefore, required extra maintenance; crank cases and gear boxes were drained at the end of each working day. Maintenance of such equipment required close supervision to avoid delays due to breakdowns. reef coral, which was compacted and stabilized It was not unusual for men to work in waist-deep water for fairly long periods. At flood tides, the planks used in bulkhead construction had to be first loosely bolted to the rails above water and then submergedinto place by a man standing on the plank until the Jbolts could be secured. Weather was always important. A storm in December 1955 caused the fill along the sides of the causeway where serious erosion was most likely to occur. This struction of the man-made islands. Approximately 50 per cent of the George-Fox cause- Gene-Irene, Peter-Tare, and Dog-George island complexes was provided through the reconstruction of existing causeways. In general, the causeways constructed during previous test Operations had been washed out as a result of high tides and storms. These were rebuilt, useing the most conveniently located bank and with sea water. Riprap provided protection of a considerable setback in progress during con- type of causeway construction, though subject way, practically all of the Easy-Dog causeway, has proven to be the most effective and economi- Roger-Peter causeways were also washed away to a larger degree of continuing maintenance, cal method of interisland connection. The lengths, widths at the top elevation, and elevations of all man-made islands and causeways at the Proving Ground are summarized at the end of this discussion. This and about 15 per cent of the Sugar-Roger and at that time. Additional men and equipment were diverted to these storm damaged areas in order to rectify the setback in progress. A summary of man-made island and causeway construction follows: Page 2-173