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SPCC for Antonini Enterprises Lathrop Facility 6. PREVENTION MEASURES PROVIDED Drainage Control Diversionary Structures and Containment(112.7(c)) 112.7(c) Appropriate containment and/or diversionary structures or equipment to prevent discharged oil from reaching a navigable water course should be provided. One of the following preventive systems or its equivalent should be used as a minimum: (1) Onshore facilities (i) Dikes, berms or retaining walls sufficiently impervious to contain spilled oil (fi) Curbing (if) Culverting, gutters or other drainage systems (iv) Weirs, booms or other barriers (v) Spill diversion ponds (vi) Retention ponds (vii) Sorbing materials (2) Offshore facilities (i) Curbing, drip pans (ii) Sumps and collection points This is an onshore facility located in the northern porton of the San Joaquin Valley. The facility makes use of double-wall containment tanks for its main diesel and gasoline fuel supply, fresh oil supply, and waste oil collection tank. While secondary containment is not provided for all of the AGTs, drainage at the site is directed towards three on-site stormwater retention ponds. In a worst case scenario, any uncontained releases at the facility would ultimately be contained within the stormwater retention ponds. Sorbing materials, shovels and receptacles (for manual containment and abatement) of small spills are present within the Refueling Bays and Maintenance Shop Area. A. Drainage Control (112.7(e)(1)(i-v)) (1) Drainage from diked storage areas: 112.7(e)(1) Facility drainage (onshore); excluding production facilities. (i) Drainage from diked storage areas should be restrained by valves or other positive means to prevent a spill or other excessive leakage of oil into the drainage system or in plant effluent treatment systems, except where plant systems are designed to handle such leakage. Diked areas may be emptied by pumps or ejectors; however, these should be manually activated and the condition of the accumulation should be examined before starting, to be sure no oil be discharged into the water. Note: This section should describe drainage in areas of the facility which have localized secondary containment. Localized containment is specifically designed to retain drainage in operating areas of a facility(e.g.,AST farm, truck loading/unloading rack,pipeline areas.) On-Site Stormwater Retention Ponds. The facility has three large stormwater retention ponds at the site (Figure 2). Stormwater Retention Pond 1 is approximately 94,500 square feet and has an effective depth of approximately 2.5 feet, resulting in an approximate volume of 236,250 cubic feet or 1,767,150 gallons. Stormwater Retention Pond 2 is approximately 30,000 square feet and has an effective depth of approximately 2.5 feet, resulting in an approximate volume of 75,000 cubic feet or 561,000 gallons. Pond 3 is approximately 20,000 square feet, and has an approximate 2.5 feet effective depth, resulting in an approximate 50,000 cubic feet or 374,000 gallons. -9-