| (a) A primary treatment unit may be an aerated lagoon,
a partially aerated lagoon, a facultative lagoon, an evaporative
lagoon, or an Imhoff tank.
(b) A secondary treatment unit may be a stabilization
lagoon, a constructed wetland, an evaporative lagoon, or an overland
flow process. A secondary treatment unit may be used for polishing
and tertiary treatment.
(c) A treated effluent storage lagoon downstream of
the sampling location in the wastewater treatment facility permit
is not considered a treatment unit for the purposes of this chapter.
(d) A secondary treatment unit must be preceded by
a primary treatment unit.
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