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❑� Northwest Pipe Spill Prevention, Control, and Countermeasure (SPCC) Plan 27 �-- Company Tracy Plant 6.0 Discharge Prevention — SPCC Requirements for Onshore Facilities (Excluding Production Facilities) Additional requirements for onshore facilities not involved in oil production are spelled out in 40 CFR§ 112.8. Those additional requirements are discussed in the subsections which follow. 6.1 Facility Drainage Potential discharges from oil storage containers are restrained by the secondary control mechanisms discussed in Section 5.2. Those secondary control mechanisms include diked containment areas and spill containment pallets. Spill kits containing sorbent materials are also onsite to contain spills outside these areas. The following subsections discuss drainage from the diked containment areas and the flows of liquids at the site. 6.1.1 Diked Storage Area Drainage The cinderblock and /or concrete dike containing the 10,000-gallon diesel AST and the 300-gallon unleaded gasoline AST has no drainage valve. The containment system serving the three 500-gallon ASTs and several drums stored under rain cover (awning) at the maintenance building has no drain valve. The custom fabricated metal containment attached to the perimeter of the slab beneath the emergency generator skid also has no drainage valve (this skid contains the EG diesel fuel - belly tank). All are designed in this fashion to prevent discharges from entering the facility stormwater drainage system. No rainwater will be pumped from a diked containment area until it has been inspected by facility personnel who are to ensure only oil-sheen free water is released; and this will not occur without the signature of a Manager on the Periodic Visual Oil Storage Inspection Form included in Appendix G of this SPCC Plan. Should a film, sheen, or discoloration, or other indication of an oil release be observed during the monthly inspections, the oily contents of the secondary containment area shall be removed physically using sorbent pads / pillows. The oil fraction may also be pumped into a container or vacuum truck and removed from the facility for appropriate disposal. As stated above, removal of rainwater from the diked storage areas shall be recorded on the Periodic Visual Oil Storage Inspection Form included in Appendix G or I of this SPCC Plan. These inspection logs shall be maintained at the facility for at least three years. 6.1.2 Diked Area Drainage Valves Diked areas have no drainage valves.