164 CHAPTER Il, SECTION 4 3 ms w-a4uz-2 a- Figure 2-137. a- 5S Applying Bare Course- NanAirstrip NAN AIRPORT: The airport consisted of a 150’ x 4500’ runway with 25’ on each side for shoulders, a 500’ x 425’ plane parking and service apron, and a 500’ x 425’ helicopter mat. Three operational buildings were also provided. Work first started on 28 December 1954 with the clearing of a center line for the survey party; over-all site clearing followed. The east 1,000 feet of the The specified compaction of the sub-base was obtained by utilizing sheep’s foot, grid, and wobbly-wheel rollers. The material used for the for compaction. The surface was removed to a following gradation as typical: proposed runway was found to be unsuitable Sieve Size 100 90 87 #+ 30 # 50 29 6 + 100 + 200 sub-base was clean, non-organic sand with the % Passing x% + 4 + 8 # 16 depth of 12 inches and replaced with borrow material prior to placing sub-base. Borrow pits were established alongside the proposed runway wherever suitable material was found. 77 1-5 0-4 Loose dry unit weight 71.5 lbs./cu. ft. Rodded dry unit weight 80.5 lbs./cu. ft. Page 2-157