The Spill Prevention, Control, and Countermeasure (SPCC) requirements govern oil discharge at aboveground storage tank sites. The EPA promulgated the SPCC regulation (40 CFR §112) on January 10, 1974 (See 38 FR 34164). The SPCC regulation requires a facility to prepare and certify by a Professional Engineer, a plan detailing the equipment, workforce, procedures, and steps to prevent and control an oil discharge to navigable waters and shorelines. The regulation at 40 CFR §112.8(c)(8) requires SPCC-subject facilities to provide for overfill protection for each container in accordance with good engineering practice including applicable industry standards.The regulation allows the owner/operator of a container to select only one suggested method of overfill controls. The options include, high liquid level alarms at a constantly attended location or surveillance station, high liquid level pump cut off devices to stop the liquid flow into a tank at a previously established level, direct audible or code signal communication between the container gauger and the pumping station, and a fast response system such as a digital computer, telepulse or direct vision gauges to determine liquid levels in a tank or container.