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❑� Northwest Pipe Spill Prevention, Control, and Countermeasure (SPCC) Plan 24 �-- Company Tracy Plant B. Prior to filling and departure of any tank truck, a close inspection for discharges at the lowermost drain and all tank truck outlets occurs. If necessary, ensure they are tightened, adjusted, or replaced to prevent liquid discharge while in transit. Overfill Precautions: Each container installation has been engineered or updated in accordance with good engineering practice to avoid discharges. Per 40 CFR § 112.7(8), at least one of the following devices will be provided: (i) High liquid level alarms with an audible or visual signal at a constantly attended operation or surveillance station. In smaller facilities an audible air vent may suffice. (ii) High liquid level pump cutoff devices set to stop flow at a predetermined container content level. (iii) Direct audible or code signal communication between the container gauger and the pumping station (tank truck driver). (iv) A fast response system for determining the liquid level of each bulk storage container such as digital computers, telepulse, or direct vision gauges. Northwest Pipe Company — TracV Plant uses direct vision gauges in many cases, and so a person will be present to monitor gauges and the overall filling of bulk storage containers at all times. (v) Liquid level sensing devices regularly tested to ensure proper operation. 5.7.1 Secondary Containment Bulk storage containers meet sized secondary containment. The 10,000-gallon diesel AST and the 300-gallon gasoline AST are located within a containment dike measuring 41 feet by 15 feet by 2.5 feet (11,500-gallon capacity). All hoses and equipment associated with these tanks are contained within the diked area. The 500-gallon automatic transmission fluid AST, 500-gallon motor oil AST, and 500-gallon hydraulic fluid AST are all located under a rain cover (awning) within a containment dike measuring 37 feet by 13 feet by 0.5 feet (1,800-gallon capacity). The containment dike is located on the north side of the maintenance building (Figure 4.4). A 248-gallon custom fabricated metal containment has been placed under the 80- gallon emergency generator diesel fuel tank (skid mounted belly tank). This secondary containment will be subject to documented monthly inspections. OFOE >55 gallon capacity and the Mobile Refueler meet General Secondary Containment. Each of these secondary containment systems will prevent a release to the environment (i.e. provide spill control) should a release occur during loading or