A compressible 12-ft clay layer beneath a building is overlain by a stratum of sand and gravel and underlain by impermeable bedrock. The total expected primary consolidation settlement of the compressible clay layer due to the building load is 4.60 in. The coefficient of consolidation (cv) is 9.04 X 10^(-4) inches^(2)/minute.
1) How long will it take for 90% of the expected total primary consolidation settlement to take place?
2) Compute the amount of primary consolidation settlement that will occur in 1 year.
3) How long will it take for primary consolidation settlement of 1 inch to take place?