The following model predicts the bulk specific weight in lbs/ft^3 of deposited sediment after t years of time have passed: Yb = Yb1 + B log(t), where Yb1 is the bulk specific weight 1 year after initial deposition. If a reservoir the size of Lake Miltona (capacity of 280,224 ac-ft) needs to be dredged after 10% of its volume is taken up by silt being deposited at a rate of 2.70*10^8 lbs/yr, how many years will pass before dredging must take place? Assume a specific gravity of the silt as 2.68, B = 5.7 lbs/ft^3, and the density of water as 62.4 lbs/ft^3.