P exposed to alternate wetting and drying. All contract work was finished on 13 March; the foundationswere then inspectedand accepted. (For detailed plans of construction, see Drawings No. ‘+49, 52, and 53.) Aomon-BiijiriCauseway. During the initial unloading and preparation period (1 January to 9 January), the C & GS survey party staked out the center line on the Zero Tower - Timing Station line, the pile line for a 30 foot wide causeway, and established elevations for the pile cut-off line. Clearing of an area on Biijiri for a borrow pit was started by the contractor. @n 10 January unloading and general preparations had progressed sufficientlyto permit driving of a test pile. After 15 minutes of driting, the m38 pile ~d penet~ted onlY 1* feet of sand and about 1 foot of an underlying xmck ledge. The test pile was pulled, and preparationswere made to crack the ledge with dynamite. This was successful,and 10 feet of penetration was obtatied when pile driving was resumed, although driving continued to be hmd~ Blasting was not again required until the line of piles reached the Aomon shore, where another rock ledge was encountered. WO* continued at an even peca; driving of 25 or 26 piles on two successive days, and placing of tie rods and whalers, advancing the fill, the resetting the pile frame on the third day. Actual progress, therefore, averaged only 17 piles per day. In an effort to speed the operation, which had been hampered by high winds, it was decidedto advame the fill and haul dirt from the borrow pit ●t night. W haulingof fill nmterial was carried on continuouslythroughout the construction;a total of 4500 cubic yards being used in the causeway, Another delay occured when it Section,XVI , —