| (a) A rotating biological contactor (RBC) may be used
in conjunction with other treatment as a dual treatment system.
(b) An RBC may be used as aroughing unit, as described
in §217.182(b)(1) of this title (relating to Trickling Filters--General
Requirements, regarding trickling filter classifications), in series
with an activated sludge system.
(c) The engineering report must include supporting
data, calculations, process descriptions, and vendor information to
describe how a proposed RBC system will meet the permitted effluent
limitations.
(d) Combined systems may be subject to the requirements
of §217.7(b)(2) of this title (relating to Types of Plans and
Specifications Approvals).
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