In a project, silty soil is to be excavated from a borrow area and used as fill. A test pit having a volume of 0.5 m is excavated in the borrow area. The total mass of the soil excavated from the test pit was 0.94 tonnes and it had a moisture content of (4+)%. The compacted fill is to have a void ratio of e = 0.55 and degree of saturation of S, - (60 + 12/1) 9 = %. (a) If (20,000 + 500.02) m of compacted fill is required in the project, what volume of the silty soil must be excavated from the borrow area? (10 marks) (b) How much water (in tonne) must be added to the excavated material prior to compaction in the fill? (10 marks)