(a) A wastewater treatment plant must at all times be under the responsible supervision of a chief operator or assistant/shift operator certified pursuant to this Part.

(b) Tables 1 and 2 (section 650.12 of this Part) indicate the minimum grade chief operator and assistant/shift operator required to be in responsible charge of the actual operation of a wastewater treatment plant and a summary of the required qualifications of the chief operator and assistant/shift operator.