A rectangular well-mixed aeration lagoon is 60m long, 5m wide, and 2m deep. It receives 400 cubic meters/day of wastewater with a BOD5 of 336mg BOD5/L for treatment. The biodegradation rate constants for the wastewater are yield coefficient = 0.8mg VSS/mg BOD5, endogenous decay constant=0.08 d^(-1), maximum specific microbial growth rate =1.10 d^(-1), and the half velocity constant = 76.0mg BOD5/L. (a.) What is the efficiency of the lagoon? (b.) The pond's efficiency depends on oxygen being always available for the microbes to use in degrading the wastewater organic carbon. How much oygen (in kg) must be supplied daily to the pond?