40 CFR § 280.241 - Designation of Class A, B, and C operators.
§ 280.241 Designation of Class A, B, and C operators.
UST system owners and operators must designate:
(a) At least one Class A and one Class B operator for each UST or group of USTs at a facility; and
(b) Each individual who meets the definition of Class C operator at the UST facility as a Class C operator.