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❑� Northwest Pipe Spill Prevention, Control, and Countermeasure (SPCC) Plan 31 �-- Company Tracy Plant 6.2.7 Heating Coils There are no heating coils associated with the ASTs at the Tracy Plant. 6.2.8 Overfill Prevention Systems The 10,000-gallon diesel AST is equipped with a high level alarm set at 90 percent of the rated capacity and a guillotine overfill prevention valve. In the unlikely event overfill of the tank occurs, the containment dike (11,500-gallon capacity) is capable of holding any overflow. The 300-gallon gasoline AST, the 500-gallon oil ASTs meet OPS 112.8 (c)(8)(iii) by using a measuring stick. The emergency generator diesel fuel (belly) tank uses an order volume management method as an overfill prevention system. Facility personnel are present throughout the filling operations to monitor the product level in these tanks as transfer is occurring. ASTs are filled to approximately 90 percent of their capacity. Secondary containment is provided for all ASTs in the event of overfill. The fluid level within the waste oil drum and all other containers /fuel tanks can be easily observed and is monitored by Northwest Pipe Company — Tracy Plant personnel during filling operations to ensure overfills do not occur. The waste oil drum is maintained within the rain covered and diked containment area north of the maintenance building. 6.2.9 Effluent Treatment Facilities No industrial processes at the Tracy Plant generate industrial wastewater as effluent subject to treatment and / or monitoring. Effluent treatment is not required for the Tracy Plant. 6.2.10 Visible Discharge Corrections Visible discharges from any container or appurtenance— including seams, gaskets, piping, pumps, valves, rivets, and bolts — are corrected quickly upon discovery. Oil is removed physically with absorbent pads/pillows or pumped promptly from the secondary containment areas, including dikes, berms, and containment pallets, and disposed of according to the waste disposal method described in Section 5.3 of this SPCC Plan. 6.2.11 Portable or Mobile Containers Small, portable oil storage containers, such as 55-gallon drums, are stored on four- drum containment pallets which provide secondary containment equivalent to 66, 90, or 132 gallons, depending upon the pallet design. Drums are stored in covered