3. A proposed factory will discharge a waste stream of 0.1 m'/s (or 8640 m3/day) of water to a nearby river. Discharge from the factory contains 5000 g/m' of 'Hoosiercide' (a dissolved and reactive chemical that I've made up!). Velocity in the river is 2,000 m/day downstream of the factory. The concentration in the river at cannot exceed 0.2 g/m' at the point where the drinking water treatment plant withdraws water 10-km downstream of the factory. Hoosiercide undergoes first-order decay at a rate of 1/day in the treatment pond, and 0.1/day in the river. Factory 0.1 m3/s Drinking (8,640 m3/d) Water 5,000 g/m3 Treatment Maximum of Pond 0.2 g/m3 B allowable here A 10 m3/s (86,400 m3/d) 0 g/m3 10 km, Velocity = 2000 m/day a. To meet the concentration limit at the drinking water intake, what is the highest concentration 10-km upstream when the river and effluent from the pond have mixed? In other words, what is the maximum allowable concentration of Hoosiercide in the river at Point A in the figure above