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6 Prevention Measures Provided <br /> A. Drainage Control <br /> All areas at this facility that store or transfer petroleum have secondary containment or a <br /> means of preventing migration of spilled product into navigable waters. <br /> o Drainage from Tank Building Storage <br /> The ASTs are located in the northwestern comer of the facility inside the Tank Building. <br /> The Tank Building has two separate rooms and each room retains two ASTs as shown in <br /> Figure 2. Floor drains located in each of the AST rooms are controlled by valves that are left <br /> in the closed position. <br /> o Valves Used on Tank Building <br /> The floor drains flow to a sand/oil interceptor through a valve box that is kept in the closed <br /> position. The floor drains are in place as part of fue suppressing system. <br /> o Facility Drainage Systems and Equipment <br /> Figure 3 illustrates the current understanding of the surface and subsurface flows. From the <br /> perspective of this SPCC, it is important to note that where releases may occur the drainage <br /> is connected to sand/oil interceptors. All surface drainage from facility flows to the Tracey <br /> Wastewater Treatment Plant. Bathroom facilities are connected to the sanitary sewer system. <br /> All surfaces of the facility that are not shown as landscape areas in Figure 2 are paved with <br /> cement. All buildings at the facility are roofed. Figure 3 illustrates the subsurface and <br /> surface drainage patterns at the facility. <br /> o Final Discharge of Drainages <br /> All final discharge waters from the facility flow to off-site treatment facilities operated by the <br /> City of Tracy. <br /> -5 <br />