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Five million gallons per day (MGD) of wastewater with a concentration 10 mg/L of a conservative pollutant is released into a stream having an

Five million gallons per day (MGD) of wastewater with a concentration 10 mg/L of a conservative pollutant is released into a stream having an upstream flow of 10 MGD and pollutant concentration of 3 mg/L (a) What is the concentration in ppm just downstream? (b) How many pounds of substance per day pass a given spot? (You may want the conversions 3.785 L/gal and 2.2 lb/kg)

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