Problem 3. A contaminated soil is to be excavated and treated in a completely mixed aerated lagoon at a Superfund site. To determine the time it will take to treat the contaminated soil, a laboratory CMBR is used to gather the following data. a) Assuming a first-order reaction, estimate the rate constant in units per day. b) Determine the time needed to achieve 90 percent reduction in the original concentration. Report your answer in days. c) Determine the time needed to achieve 99 percent reduction in the original concentration. Report your answer in days