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5. An open cut section for an Ontario municipal roadbuilding contract required a subdrain installation of a 100 mm diameter plastic pipe. The subdrain trench was excavated in a soil with the following test data: i. % passing 100 97 Particle size analysis: Diameter (mm) 0.6 0.15 0.075 0.04 0.02 0.004 0.002 0.001 90 74 56 20 11 6 ii. Atterberg Limits: PL = 24; LL = 22 For backfill, the contractor placed and compacted aggregate from a local pit meeting the Granular A specifications of OPSS 1010: a) Plot the gradation curves for the subgrade and backfill materials. (2 marks) b) Based on the materials, are there likely to be drainage issues with the performance of the subdrain? If so, what are the risks? (5 marks) c) Classify the subgrade soil (USCS, AASHTO) and identify any performance issues with this material