Section 75.47 - Criteria for a class of affected units(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