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on spill containment pallets providing containment of 110 % of capacity, or are stored within concrete- walled storage areas that provide secondary containment. Mobile and portable built-in tanks indicated as single wall rely on active containment utilizing spill kits and collapsible spill berms. 6.5 Rainwater Drainage Two containment areas are located outside will possibly collect rainwater within the containment area in the event of a storm. The first is the Auto Shop storage area located east of the Auto Shop. This storage area is covered but is open on one site, and rainwater may blow into the secondary containment pallet. The secondary containment pallets have a plug that be manually opened to remove accumulated rainwater. Accumulated rainwater is visually inspected for signs of oil or other waste and/or tested for contamination when visibly observed or suspected before removed. If the rainwater test positive for contaminants that create a hazardous waste, it will be removed and stored in hazardous waste drums for disposal. If the water is clean, it will be drained onto the ground next to the storage areas. A log for draining the Oil Drum Storage Area will be maintained by the HazMat Specialist, and will record the date and time the containment is drained, the results of the visual inspection and/or testing, the estimated quantity of water removed, how the water was disposed of, and the name and signature of the person removing the water. The second containment area subject to rainwater accumulation is the used oil AST, which is a single- wall AST within a poly containment. The containment may collect oil from transfer or due to leakage from the tank or rainwater may get in if the tarp is not completely covering the tank. This area is not designed with a plug or valve that may be manually opened to remove accumulated rainwater. Accumulated rainwater or oil must be manually pumped out. Accumulated rainwater will be visually inspected for signs of oil or other waste and/or tested for contamination before it is removed. If the rainwater tests positive for contaminants that create a hazardous waste, it will be removed and stored in hazardous waste drums for disposal. If the water is clean, it will be pumped onto the area next to the AST. A log for draining the secondary containment will be maintained by the HazMat Specialist, and will record the date and time the containment is drained, the results of the visual inspection and/or testing, the estimated quantity of water removed, how the water was disposed of if contaminated, and the name and signature of the person removing the water. A log that may be used to document draining rainwater from secondary containment is provided in Appendix G. 6.6 Completely Buried Metallic Tanks There are no completely buried metallic tanks within the NCYCC facility. 6.7 Integrity Testing In compliance with 40 CFR 112.8(c)(6), monthly visual inspections will be used to ensure integrity of the bulk storage tanks, without non-destructive integrity testing (such as hydrostatic or ultrasonic testing). Periodic visual inspections forms were selected based on the recommendations given in the Steel Tank Institute "Standard for the Inspection of Aboveground Storage Tanks" (STI SP001, 6t" Edition). Annual visual inspections will be performed using the form provided in Appendix F-1, which are taken from STI SP001; monthly visual inspections will be performed using the form provided in Appendix F-2 and Appendix F-3. These visual inspections shall be performed by a staff knowledgeable of the storage tank operations, the type of AST and its associated components, and characteristic of the fluid stored. Page 114