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to contain the volume of the largest tank in the area plus a 25-year 24-hour rainfall event if constructed in an uncovered area(4 inches). 18.3.2 Secondary Containment—§112.8(c)(2) The tanks and usage areas at the Terminal have secondary containment as discussed for each usage area in Section 5.0. The oil storage and usage areas have sufficient secondary containment to hold the contents of the container plus sufficient freeboard for a rainfall event if applicable. 18.3.3 Draining Tank Farm Areas—§112.8(c)(3) Procedures for draining the diked area at the fuel farm are discussed in Section 5.0. 18.3.4 Buried Metallic Storage Tanks—§112.8(c)(4) There are no SPCC regulated buried metallic storage tanks at the Facility; therefore, this section is not applicable. 18.3.5 Partially Buried Storage Tanks—§112.8(c)(5) There are no partially buried storage tanks installed at the facility; therefore,this section is not applicable. 18.3.6 Periodic Integrity Testing—§112.8(c)(6) Aboveground storage containers must be tested for integrity on a regular schedule and whenever repairs are made. The frequency is to be determined based on type. Not to be confused with monthly visual inspections,integrity testing consists of any means to measure the strength(i.e. structural soundness)of the container shell, bottom, or flow to contain oil and may include leak testing to determine whether the container will discharge oil. The inspections and testing are conducted in accordance with the applicable API 653 and STI SP001 standards. The active, shop fabricated ASTs at the Facility with capacities less than 5,000 gallons have a continuous release detection method and spill control and are classified as Category One ASTs, as defined by STI SPOOL STI SP001 standards require monthly and annual visual inspections for Category One ASTs. The monthly inspections meet the requirements for annual inspections. Portable containers, including drums, are visually inspected monthly to meet the requirements of STI SP00L The two 80,000-gallon aboveground diesel fuel tanks (Tanks 2 and 3) are field-erected tanks and are integrity tested by a certified inspector in accordance with the standards in API 653. The out of service API 653 was conducted on Tank 3 in 2010. A similar service report was prepared for Tank 2. Records documenting the API 653 integrity tests will be maintained in the Manager Equipment Service's files for the life of the tank. Brittle fracture evaluations are required for the field-erected tanks storing oils that undergo major repairs or alterations. Brittle fracture evaluations will be conducted on Tank No. 2 or Tank No. 3 if they undergo repair,alteration,reconstruction, or a change in service that may have a significant effect on tank integrity. Because the remaining tanks at the Facility are shop-fabricated, brittle fracture evaluations are not applicable to the other storage tanks at the Facility. 18.3.7 Internal Heating Coils—§112.8(c)(7) There are no tanks with internal heating coils; therefore,this section of the regulation is not applicable. 42