In this article, unless the context otherwise requires:

1. "Annual throughput" means the amount of gasoline transferred into or dispensed from a gasoline dispensing site during twelve consecutive months.

2. "Clean air act" means the clean air act of 1963 (P.L. 88-206; 42 United States Code § 7401-7671) as amended by the clean air act amendments of 1990 (P.L. 101-549).

3. "Gasoline dispensing site" means any site where gasoline is dispensed into a motor vehicle fuel tank from any stationary storage vessel.

4. "Stage I vapor recovery system" means a combination of pipes and hoses that creates a closed system between the vapor spaces of an unloading gasoline cargo tank and a receiving storage tank so that vapors displaced from the storage tank are transferred to the gasoline cargo tank being unloaded.