Question 4 A series of Proctor compaction tests were performed on fill material used for a roadway application. The results are shown in the Table below. Data Point No. 1 3.54 4.63 Mass of compacted soil + mould (kg) Moisture content, w (%) 2 3.732 7.45 3 3.93 11.42 4 3.935 14.86 5 3.87 18.2 The mass of the compaction mould was 1.952 kg. The mould volume was 110- m. (a) Compute dry unit weight ya for each data point. (b) Draw the Proctor compaction curve of the soil, and determine the maximum dry unit weight 7d max and optimum moisture content Wopt. (c) Determine the degree of saturation at yd max using a specific gravity of solids Gs of 2.65. (d) A field density test has been conducted in the roadway. The test results indicate the field dry unit weight is 94% of the %d max. Determine whether the tested section should be passed or not. What advice would you give to the earthworks contractor who is constructing the road?