Under 9VAC25-91-10 et seq. the DEQ regulates individual petroleum aboveground storage tanks (ASTs) with capacities of 660 gallons or more at facilities with an aggregate storage capacity greater than 1,320 gallons. The level to which a facility is regulated depends on the total volume capacity available at that facility. Facilities with an aggregate regulated AST capacity below 25,000 gallons are only required to meet the provisions of Part II of the regulations including registration, notification, and closure requirements. UVA falls into this category. Emergency generator tanks that are part of the structure of the emergency generator, otherwise known as belly tanks or base tanks, are currently excluded from the aggregate AST capacity calculation according to 9VAC25-91-30.A.14. The few regulated aboveground storage tanks at UVA are those that are stand-alone tanks that serve an emergency generator but are not integral to an emergency generator. Any tank that is integral to an emergency generator is not regulated by DEQ.