A community has a 285 MGD wastewater treatment plant (WWTP) located near a river

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A community has a 285 MGD wastewater treatment plant (WWTP) located near a river. The WWTP discharges its treated wastewater effluent into the river that has a background BOD of 2 mg/L. The 7-day 10-year low flow of the river is determined to be 35 m3/s, and was used to develop an NPDES permit for the WWTP facility that allows release of BOD concentrations ? 30 mg/L. The WWTP discharges treated effluent of 30 mg/L into the river as issued by the NPDES permit...................................................................................................................................................................................................................................... a. 7Q10 = 35 m3/s; Calculate the probability that the flow in the river will be equal or exceed 35 m3/s during the statutory period of the permit...................................................................................................................................................................................................................................... b. Calculate the resulting in-stream BOD concentration in the river at the point of discharge or immediately after discharge. Assume a complete mix. ................................................................................................................................................................................................................................................. c. The NPDES permit determines that the allowable in-stream BOD at the point of discharge is 12 mg/L to avoid violation of a state

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