Biofuel Compatibility Requirements for Underground Storage Tanks (USTs)

Fueling station owners and operators must notify the appropriate state and local implementing agencies at least 30 days before switching USTs to store ethanol blends greater than 10%, biodiesel blends greater than 20%, or any other regulated fuel the agency has identified. This notification timeframe allows agencies to request information on UST compatibility before the owner or operator stores the fuel. Owners and operators must also demonstrate UST system compatibility and maintain records of compliance from the implementing agency for as long as the UST is used to store the fuel. For more information on compatibility requirements and implementing agencies by state, see the U.S. Environmental Protection Agency UST Compatibility website and the final rule in the Federal Register. (Reference 40 CFR 280.32)

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