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Spill Prevention, Control and Countermeasure Plan Tesla Treatment Facility Page 36 of 45 3.3.2 Secondary Containment [40 CFR§112.8(c)(2)] At the Emergency Power Generation Facility, the bulk storage tanks and day tanks in the fixed standby power generators are of double-wall construction with the outer shell of each tank designed to contain 110% of the volume in the primary shell (PCL, October 6, 2011). The underground piping at the facility is of double-wall construction The sections of underground piping between the bulk storage tanks and generators' day tanks are constructed of schedule 40 black steel primary pipes with fiberglass secondary containment engineered to drain to a sump or low point monitored continuously with leak detection sensors (PCL, October 6, 2011). 3.3.3 Drainage of Uncontaminated Rainwater [40 CFR§112.8(c)(3)] Although there are no diked oil storage areas at the standby power generators and bulk storage tanks facility, rainwater will seasonally collect in secondary containment structures, namely the containment box at the fuel transfer port in the loading/unloading area, and the below-grade valve vaults where piping from the bulk storage tanks connects to piping to the generators' day tanks. Whenever rainwater collects in secondary containment structures and must be drained, the water is inspected visually for any evidence of oil contamination prior to discharge. The decision to discharge accumulated water is made by the Chief Stationary Engineer or designated facility operator. If the visual inspection of the water indicates no evidence of a sheen, film or other sign for the occurrence of oil,the water accumulated in the secondary containment is removed by either bailing or pumping. The water is discharged onto the surface where it is allowed to pool and generally allowed to either evaporate or dissipated into the ground. Depending on the volume of water discharged, there is a potential that the discharged water may flow by gravity into a nearby stormwater catch basin inlet to enter the facility's stormwater drainage system. The stormwater drainage in the area encompassing the Emergency Power Generation Facility is engineered to drain into the detention pond located along the south side of the Tesla Treatment Facility. In accordance with 40 CFR§I 12.8(c)(3ii) of the SPCC Rule, if a sheen or other product impact indicator is observed during inspection, the accumulated water in the containment berm is pumped into a 55-gallon USDOT drum for temporary onsite storage. Once the wastewater has been chemically characterized,the drummed wastewater is hauled offsite for final disposition. Inspections and drainages are documented and the records maintained in the Operations Building for a minimum period of three(3)years. 3.3.4 Cathodic Protection of Buried Tanks [40 CFR§112.8(c)(4)] 40 CFR§112.8(c)(4) of the SPCC Rule does not apply because there are no buried or underground storage tanks at the Tesla Treatment Facility. 3.3.5 Cathodic Protection of Partially Buried Tanks [40 CFR§112.8(c)(5)] 40 CFR§112.8(c)(5) of the SPCC Rule does not apply because there are no partially buried or bunkered storage tanks at the Tesla Treatment Facility.