4. (20 points) An in-line equalization (EQ) basin is to be designed for a wastewater treatment plant. From plant records, the following compilation has been made showing the average hourly flowrate and BOD5 concentration into the plant versus time of day: BOD (mg/L) 100 70 HOUR 12 AM 1 2 3 4 5 6 7 8 9 10 11 12 noon FLOW (m/d) 11,400 8,300 7,900 7,600 9,100 10,600 13,600 20,800 25,000 28,000 28,800 26,900 25,700 60 50 80 90 120 140 160 220 230 200 190 HOUR 1 PM 2 3 4 5 6 7 8 9 10 11 12 AM FLOW (m/d) 25,000 25,000 26,900 28,800 32,900 37,500 37,500 31,800 23,100 15,900 13,200 11,400 BODS (mg/L) 170 180 210 240 260 270 280 250 150 130 110 100 (a) What is the average daily flow entering the plant? Report your answer in m/d, m?/min, and m/s. (b) Over an entire day, what volume of water (in m) enters the plant? (c) What design volume (in m) is required for the EQ basin to provide for a uniform outflow equal to the average daily flow? Assume that an addition of 25% to the estimated minimum volume will be provided to account for contingencies. (d) Over an entire day, what mass of BODs (in kg) enters the plant? (e) Over an entire day, what is the average concentration of BODs (in mg/L) that enters the plant? What average concentration of BODs (in mg/L) leaves the EQ basin