A supplemental treatment unit or engineered system used to perform additional wastewater treatment functions, beyond that provided by a standard system, and capable of reliably producing wastewater effluent of secondary quality or better, prior to discharge to the dispersal system. For purposes of this chapter, secondary quality is defined as effluent meeting thirty (30) day average concentration limits of thirty (30) mg/L for biological oxygen demand and thirty (30) mg/L for total suspended solids. If the supplemental treatment is for the purpose of nitrogen reduction, the supplemental treatment is defined as meeting a fifty (50) percent reduction in total nitrogen when comparing the thirty (30) day average influent to the thirty (30) day average effluent.
(Ord. 1469, eff. July 14, 2016)