40 CFR § 75.47
Criteria for a class of affected units
June 9, 2020
(a) The owner or operator of an affected unit may represent a class of affected units for the purpose of applying to the Administrator for a class-approved alternative monitoring system.
(b) The owner or operator of an affected unit representing a class of affected units shall provide the following information:
(1) A description of the affected unit and how it appropriately represents the class of affected units;
(2) A description of the class of affected units, including data describing all of the affected units that will comprise the class.
[60 FR 40297, Aug. 8, 1995, as amended at 76 FR 17312, Mar. 28, 2011]