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❑� Northwest Pipe Spill Prevention, Control, and Countermeasure (SPCC) Plan 130 �-- Company Tracy Plant Rainwater within secondary containment shall be inspected by facility personnel prior to pumping to ensure only oil-free water (i.e., no sheen) is released. If the rainwater is found to be sheen free, this will be verified by a Manager who is to affix his / her signature to Periodic Visual Oil Storage Inspection Forms included in Appendix G or I of this SPCC Plan. These inspection logs shall be maintained at the facility for at least three years. Should a sheen or other indication of oil release be observed, the oily contents of the diked area shall be removed physically using sorbent pads / pillows or pumped into a container or vacuum truck and removed from the facility for appropriate disposal. 6.2.4 Corrosion Protection for USTs There are no underground storage tanks at the Northwest Pipe Company- Tracy Plant. 6.2.5 Partially Buried or Bunkered Tanks There are no partially buried or bunkered tanks at the Northwest Company- Tracy Plant. 6.2.6 Integrity Testing and Inspection of Aboveground Containers Visual inspections of all containers and ASTs by facility personnel are performed according to the procedure described in Section 5.4 of this SPCC Plan. Records of inspections and tests are signed by the inspector and kept at the facility for at least three years. The scope and schedule of certified inspections and tests performed on the facility's ASTs take into account container size, configuration, and design. A formal external inspection by a STI certified inspector will be performed according to the standards of the Steel Tank Institute (STI) method SP001 on this 10,000-gallon diesel AST every 5 years. This will include ultrasonic testing (or other systems of non- destructive testing) plus evaluation of this container's supports and foundations. Inspection records completed by the certified inspector are maintained with this SPCC Plan and will be retained for the life of the AST. Northwest Pipe Company personnel will perform monthly inspections of this AST installation, documenting the condition of the outside of this AST for signs of deterioration, discharges, or accumulation of oil inside the dike. This policy and procedure was deemed appropriate for this AST by Northwest Pipe Company operational and management staff, in addition to the PE certifying this SPCC Plan. All integrity testing inspection records are to be maintained with this SPCC Plan for the life of this AST. Refer to Table 5.2 for a summary of inspections and tests performed on bulk storage containers at the Tracy Plant.