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SPCC for Antonini Enterprises Lathrop Facility The facility is graded to direct all on-site stormwater to the retention ponds. Accumulated stormwater in the ponds evaporates and/or percolates into the subsurface. There are no overflows associated with the ponds. Ponds 1 and 2 have a storm drain inlet and valve at their low points. The valves are in a closed position, but can be opened to allow flow into the City of Lathrop Stormwater Drainage System. The benefit of the stormwater retention ponds is that they allow an additional containment basin in the event of an uncontrolled product release. There are no flows off-site to navigable waters. (ii)Valves used on diked area storage: 112.7(e) (1) Facility drainage (onshore); (excluding production facilities). (ii) Flapper-type drain valves should not be used to drain diked areas. Valves used for drainage of diked areas should, as far as practical, be of manual, open-and-closed design. When plant drainage drains directly into water courses and not into waste water treatment plants, retained storm water should be inspected as provided in paragraphs(e)(2)(iii)(B), (C)and(D)of this section before drainage. Stormwater Retention Ponds 1 and 2 have a storm drain inlet and valve at each of their low points. The valves are in a closed position, but can be opened to allow flow into the City of Lathrop Stormwater Drainage System. Antonini Enterprises, LLC does not have a valve key for the storm drain valves and must contact the City of Lathrop if the storm drain valves need to be opened to drain the retention ponds. (iii) Plant drainage systems from non-diked areas: 112.7(e)(1) Facility drainage (onshore); (excluding production facilities). (iii) Plant drainage systems from non-diked areas should, if possible, flow into ponds, lagoons or catchment basins designed to retain oil or return it to the facility. Catchment basins should not be located in areas subject to periodic flooding. Note: This section should describe drainage in areas of the facility that do not have localized containments (e.g., area drains to a retention pond). Facilities must ensure that such systems are designed in accordance with good engineering practices. There are two stormwater drain inlets at the facility, both of which are normally closed. Stormwater flows overland to the stormwater retention ponds. Any uncontained petroleum spill would ultimately be contained within the stormwater retention ponds where it could be collected for recycle or disposal by a licensed waste hauler. (iv) Final discharge of drainage: 112.7(e)(1) Facility drainage (onshore); (excluding production facilities). (iv) If plant drainage is not engineered as above, the final discharge at all in-plant ditches should be equipped with diversion system that could, in the vent of an uncontrolled spill, return the oil to the plant. Unabated spills within the Fuel Storage Area, Maintenance Shop Area, or Refueling Bays would flow outward towards the stormwater retention ponds. At the stormwater retention ponds, there are no overflows or piping to navigable water bodies off-site. The stormwater retention ponds are the final destination in the event of a worst case unabated spill. (v) Facility drainage systems and equipment: 112.7(e)(1) Facility drainage (onshore); (excluding production facilities). (v) Where drainage waters are treated in more than one treatment unit, natural hydraulic flow should not be used. if pump transfer in needed, two :lift"pumps should be provided, and at least one of the pumps -10-