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Section Number: 2-1 Issue Date: 05/06/2010 Revision Date: Page 15 of 16 2-9 UNDERGROUND STORAGE TANKS Overview The purpose of this section is to provide definition related to underground storage tanks (USTs), identify the regulatory requirements for operating these tanks, recordkeeping requirements, and what to do in the event of a release from an underground tank. Three Key Issues: • Any storage tank system with more than 10% of its volume underground (including piping) is considered an UST, and must be installed to meet Federal, State, and local standards. • Heating fuel USTs, USTs above the floor in basements, flow-through process tanks, and USTs holding less than 110 gallons are exempt from the Federal UST rules. • In the event of a release from a UST, immediately contact Operations Support at 630/271-2988. Definitions Underground Storage Tanks 0 a tanks stem with more than 10% of its volume underground Corrosion Protection 0 a method to prevent the metal material of the UST and related piping from corroding Sacrificial Anode 0 a piece of metal attached to a UST that oxidizes and corrodes sacrificially, to prevent the UST material from corroding Leak Prevention a a method to prevent USTs from leaking the contents into the surrounding soil, such as double walls on the UST Leak Detection a a method to detect a leak in USTs or related piping Interstitial Monitoring 0 a leak detection system that monitors for liquid between the walls of a double -walled UST Vapor Monitoring 0 a leak detection system that monitors for petroleum vapors in the soil around the USTs Overfill Protection 0 a method to prevent excess product spilled at the fill port from reaching the surrounding soils Note: USTs exempt from the federal rules include those storing heating fuel for use on the premises, tanks above the floor of underground facilities (basements), flow- through process tanks, and USTs holding 110 gallons or less. However, local and state UST regulations may be more stringent than federal requirements and may not exempt these USTs. Check with local and state environmental regulations for a determination.