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Part 112.7 (c). For example, small double walled ASTs, when used generally would provide substantially equivalent protection of navigable waters under section 112.7 (c) of the SPCC regulation when the inner tank is an Underwriters' Laboratory-listed steel tank, the outer wall is constructed in accordance with nationally accepted industry standards (e.g., those codified by the American Petroleum Institute, the Steel Tank Institute, and American Concrete Institute), the tank has overfill prevention measures that include an overfill alarm and an automatic flow restrictor or flow shut-off,2 and all product transfers are constantly monitored.3 CONCLUSION When the only significant source of potential oil spills to navigable waters of the United States from a facility is from alternative ASTs as described in this memorandum, an SPCC Plan that is certified by a Registered Professional Engineer and that requires equipment and operating practices in accordance with good engineering practice and the principle of substantial equivalence as described above should be presumed to achieve the protection of navigable waters substantially equivalent to that provided by the preventive systems specified in 40 CFR Part 112.7 (c). CC: Removal Managers, Regions I-X 2 Consistent with the performance standards for these devices as described in section 280.20(c)of EPA regulations for USTs at 40 CFR Part 280 and in an August 5, 1991,amendment,an automatic flow shut-off will shut off flow so that none of the fittings located on top of the tank are exposed to product as a result of overfilling,and automatic flow restrictor will restrict flow 30 minutes prior to overfill or when the tank is no more than 90 percent full,and a high level alarm will alert the operator one minute before overfilling or when the tank is no more than 90 percent full. s Consistent with the performance standard for overfill control as described in section 280.30(a)of EPA regulations for USTs at 40 CFR Part 280,an owner/operator of the facility will ensure that the transfer operation is monitored constantly to prevent overfilling and spilling.