RUNIT AIRSTRIP The airstrip existing on Runit before this Project was begun was 700 feet long, It was radically off—wind and too short for safe operations in unfavorable weather. Therefore, a new strip was designed, oriented into the wind, This was extended to 1000 feet by providing for fill on the reef at the ocean side of the island, with borrow from the adjacent coral reef, The axis of this airfield has a bearing of N 70° E, in the direction of the prevailing winds on the atoll, Approximately 7,500 square yards of paving were used on this airstrip, Design specified paving with a@ well graded aggregate, and approximately 400 sacks of rejected Portland cement were experimentally added to the Bitummls asphalt. BILJIRI AIRSTRIP On Biijiri, an existing airstrip was paralleled with a new and longer strip having a length of 1100 feet and a bearing of N 78°27'28" E, Stand- ard base and paved surface design was provided, The subbase of this new airstrip, although well prepared and properly stabilized, contained a high moisture content because of an excessive amount of rainfall during construction. Although the aggregate was of samd alone, it was of good gra- dation, and approximately & per cent ef Bitumls was used, Because of the free moisture already in the subgrade, together with the moisture in the mix, am abnormally long time was required for the curing process. More than the usual amount of rolling was done in an attempt to hasten the drying process, In a week or ten days after the rainfall returned to nor- mal, the pavement dried out and resulted in a serviceable airstrip. ENGEBI AIRSTRIP The original airstrip on Engebi could be reconditioned in its existing location on its bearing of N 76°944'05" E, As a consequence, plans called only for clearing and blading. Wo paving was specified. BOGALLUA A plan showing the prepesed complete development of Bogallua Island, including an airstrip, was prepared in October 1949. This strip was 900 feet by 50 feet. Its bearing was N 70° E, the direction of prevailing winds, Stabilized soil was to be covered with Marsden matting. The strip was constructed as planned between January 14 and January 21, 1950. HELICOPTER MATS Helicopter mats, essentially cleared, stabilized areas 150 feet by 150 feet were provided on Piraai, Bokow, and Teiteiripucehi to facilitate acceas to these sites during operational periods. 5-295