Control means: When it is used to join all entities under common management, means any one or a combination of the following:
(i) A third person or firm has equity ownership of 51 percent or more in each of two or more firms;
(ii) Two or more firms have common corporate officers, in whole or in substantial part, who are responsible for the day-to-day operation of the companies.
(iii) One firm leases, operates, supervises, or in 51 percent or greater part owns equipment and/or facilities used by another person or firm, or has equity ownership of 51 percent or more of another firm.
(2) When it is used to refer to the management of vehicles, means a person has the authority to decide who can operate a particular vehicle, and the purposes for which the vehicle can be operated.
(3) When it is used to refer to the management of people, means a person has the authority to direct the activities of another person or employee in a precise situation, such as at the workplace.
40 CFR § 88.302-94
The definitions in 88.302-93 and 40 CFR part 86 also apply to this part. All terms used in this part, but not defined in this section or in 88.302-93 and 40 CFR part 86 shall have the meaning assigned to them in the Clean Air Act.