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SPCC for Antonini Enterprises Lathrop Facility outer tank wall. The interstitial monitoring of the electronic fuel inventory system can monitor for such a leak. 3) A worst case scenario would be a simultaneous breach of both walls of AGT 1. In this scenario, diesel fuel could flow up to 100 gpm and possibly release all 14,982 gallons of stored fuel. The release would flow in a southerly direction to Stormwater Retention Pond 1. This pond would be the end point of the spill and acts as tertiary containment in this scenario. This scenario would likely be caused by a vehicle crash into AGT 1 or potentially an errant fork-lift accident. It is highly unlikely as vehicle speeds are controlled at the facility and the AGT is protected by numerous concrete-filled steel bollards with approximate 4-foot center spacing on all three sides of vehicle approach. 4) A malfunctioning or leaking dispenser could result in a low volume release (less than 10 gpm) during operation of the dispenser within the Refueling Bays. The release would spill across the floor of the bay likely total less than 20 gallons. A spill of this size could potentially flow towards the southern stormwater retention pond, but would likely be noted by site personnel before reaching the retention pond. The material on paved surfaces could be contained, absorbed, and disposed of properly by shop personnel. AGT 2: 11,003-Gallon Gasoline There are four potential spill scenarios associated with this gasoline supply AGT. 1) Overflow during resupply. If this occurred, the release would likely be less than 25 gpm with release volume less than 50 gallons. Spill should be noted by delivery person and quickly abated. The fill line is situated within an approximate 5-gallon spill containment box. Small drips and leaks are easily contained within the box. 2) Hole in bottom of AGT 2. Flow from such a leak would vary depending on size of hole, but would likely be a stress fracture with relatively slow release rate of less than 25 gpm. This release would be controlled within the secondary containment provided by the outer tank wall. The interstitial monitoring of the electronic fuel inventory system can monitor for such a leak. 3) A worst case scenario would be a simultaneous breach of both walls of AGT 2. In this scenario, gasoline fuel could flow up to 100 gpm and possibly release all 1,003 gallons of stored fuel. The release would flow in a southerly direction to Stormwater Retention Pond 1. This pond would be the end point of the spill and acts as tertiary containment in this scenario. This scenario would likely be caused by a vehicle crash into AGT 2. It is highly unlikely as vehicle speeds are controlled at the facility and this AGT is protected by concrete-filled steel bollards on all three sides of vehicle approach. 4) A malfunctioning or leaking dispenser could result in a low volume release (less than 10 gpm) during operation of the dispenser. The release would likely total less than 20 gallons. A spill of this size would flow towards the southern stormwater retention pond, but would likely be noted by site personnel before reaching the retention pond. The material on paved surfaces could be contained, absorbed, and disposed of properly by shop personnel. AGT 3 and AGT 4: 15-Gallon Diesel There are three potential spill scenarios associated with these steam cleaner AGTs. 1) Overflow during resupply. If this occurred, the release would likely be less than 2 gpm with release volume less than 5 gallons. Spill should be noted by delivery person and quickly abated. 2) Hole in bottom of AGT 3 or AGT 4. Flow from such a leak would vary depending on size of hole, but would likely be a stress fracture with relatively slow release rate of less than 1 gpm. It is possible that such a release could empty the entire tank (15 gallons) if not witnessed and would flow towards the southern stormwater retention basin. The size of -5-