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SPCC for Antonini Enterprises Lathroo Facility the storm drain valves and must contact the City of Lathrop if these valves need to be opened to drain the retention ponds. Floor drains located within the Wash Rack Area drain to an oil/water separator (on the south side of facility). The separator is cleaned out periodically to remove oil/grease and sediment. The water from the separator is discharged to the City of Lathrop Sanitary Sewer System under a separate industrial wastewater use permit(Wastewater Discharge Permit#2012-1). 4. SPILL HISTORY (112.7(a)) 112.7(a) A facility that has experienced one or more spill events within twelve months prior to the effective date of this part should include a written description of each such spill, corrective action taken and plans for preventing a recurrence. Note: Include type and amounts of oil spilled, location, date and time of spill(s), watercourses affected (if any), physical damages, cost of damages, costs of cleanup, cause of spill or discharge, and corrective action taken. There have been no known spill events at this Facility. 5. POTENTIAL SPILL PREDICTIONS, VOLUMES, RATES, AND CONTROL (112.7(b)) 112.7(6) Where experience indicates a reasonable potential for equipment failure (such as tank overflow, rupture, or leakage) the plan should include a prediction of direction , rate of Now, and total quantity of oil which could be discharged from the facility as a result of such action. Note: Types of failure to consider include tank (aboveground and underground) overflow, rupture or leakage, pipe failure, waste water treatment facility failure and spills during transfer operations at the rack and/or dock or tank truck parking areas. The direction a spill would flow can be predicted by drainage patterns, the location of storm or sewer drains, and secondary containment; those predictions should be performed or verified by a Professional Engineer. The rate of flow will depend upon the size and location of the failure and the equipment involved. The total quantity of oil which could be discharged from the facility should be based on a worst case situation and the time it would take to respond to a spill(e.g., shutting off a pump or closing a valve). None of the AGTs or associated piping have experienced overflows, ruptures, or leakage since their use at the facility was established. Minor spills (less than one-gallon) may have occurred, but these are quickly abated and remediated. Throughout the following potential spill scenarios, a worst case unabated release could not reach a navigable water since the facility is sloped and drains to three on-site stormwater retention ponds. These ponds act as a final containment basins for unabated spills. AGT 1: 14,982-Gall Diesel Storage Tank There are four potential spill scenarios associated with this diesel supply AGT. 1) Overflow during resupply. If this occurred, the release would likely be less than 25 gallons per minute (gpm) with release volume less than 50 gallons. Spill should be noted by delivery person and quickly abated. The fill line is a camlock fitting within an approximate 20-gallon spill containment box. Small drips and leaks are easily contained within the box. 2) Hole in bottom of AGT 1. 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 -4-