An industrial outlet is discharging a 1.8 m/s waste stream with a BOD of 20 mg/L and a DO concentration of 1.5 mg/L into a river with a flow of 70 mº/s that contains 0.51 mg/L BOD and has an existing oxygen deficit of 1.2 mg/L If the saturated DO concentration is 9.50 mg/L, what is the initial deficit D. (mg/). In the Oxygen Sag Model for this situation?
a. 1.37 mg/L
b. 1.0 mg/l
c. 1.2 mg/L
d. 8.0 mg/L