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6.3.1 Aboveground Tank Periodic Integrity Testing 112.8(c)(6), You must test each aboveground container for integrity on a regular schedule, and whenever you make material repairs. The frequency of and type of testing must take into account container size and design (such as floating roof, skid -mounted, elevated, or partially buried). You must combine visual inspection with another testing technique such as hydrostatic testing, radiographic testing, ultrasonic testing, acoustic emissions testing, or another system of non-destructive shell testing. You must keep comparison records and you must also inspect the container's supports and foundations. In addition, you must frequently inspect the outside of the container for signs of deterioration, discharges, or accumulation of oil inside diked areas. Records of inspections and tests kept under usual and customary business practices will suffice for purposes of this paragraph. Visual Inspections Other than visual examination when operating, no other written inspections of aboveground containers are required for the Swift oil -storage containers. As summarized in Table 9-1 on page 15A, the oil containers included in this Plan are subject to monthly visual inspections using the Inspection Checklist in Attachment D. Completion of the monthly inspections will be tracked and records maintained by the Facility Manager or designee. Integrity Testing Although 40 CFR 112.8(c)(6) requires integrity testing for each aboveground storage container, the USEPA March 2004 industry settlement established exceptions to the regulation. In accordance with the industry settlement, integrity testing is not required for aboveground tanks that meet either of the following criteria: • Well-designed with a capacity less than 30,000 gallons on a pedestal or support that permits visual inspection of all sides. • Well-designed with a capacity less than 30,000 gallons resting on an impermeable surface (i.e., concrete, asphalt) so that releases can be readily observed. • Double-wall tanks and vaulted tanks with interstitial monitoring. As long as the monthly visual inspections of these tanks reveal no indications of defects, visual inspections are sufficient to verify the integrity of the tanks at Swift. Required Integrity Testing for Future Installations, Material Repair, and Recommissioning For any new shop -fabricated tanks that may be installed in the future, Swift should obtain certification of integrity testing from the manufacturer or installer prior to placing the tank into service. Likewise, if there is a material (significant) repair of the tank, the integrity of the tank must be tested by an appropriate method before the tank is returned to service. See the Executive Summary for consideration of industry standards. Page 11A