A wastewater treatment plant discharges total phosphorus in its effluent throughout the year into a nearby river. The treatment plant produces flows of 6 MGD with a total phosphorus concentration of 4.0 mg/L. The receiving river has an upstream flow of 200 ft3/sec and a background concentration of total phosphorus of 0.3 mg/L.
Determine the concentration (in mg/L) of total phosphorus in the river at a point downstream of the effluent location.
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