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Section 5 of the standard addresses the criteria, including AST type,size,type of installation, corrosion rate, and previous inspection history, if any,that should be used to develop a schedule of inspections for each AST. A Table of Inspection Schedules (Table 5.5) places tanks into one of three categories and establishes different requirements regarding the type and frequency of periodic inspection by tank owner/operators as well as formal external and internal inspections by a certified inspector.The factors used for categorizing tanks include: • Tank size, • Whether the tank is in contact with the ground, • The presence or absence of secondary containment or spill control, and • The presence or absence of a continuous release detection method (CRDM). Section 6 of the standard provides guidelines for the periodic inspections conducted by the owner or his/her designee.The owner's inspector is to complete an AST Record for each AST or tank site, as well as a Monthly Inspection Checklist and an Annual Inspection Checklist. Monthly inspections should monitor water accumulation to prevent Microbial Influenced Corrosion (MIC), and action should be taken if MIC is found. Additional requirements for field-erected tanks are in Appendix B of STI SP001. Section 7 of the standard contains the minimum inspection requirements for formal external inspections,which are to be performed by a certified inspector. Inspections should cover the AST foundations, supports, secondary containment, drain valves, ancillary equipment, piping,vents,gauges, grounding system (if any), stairways, and coatings on the AST. Original shell thickness should be determined using one of several suggested methods. Ultrasonic Thickness Testing (UTT) readings are to be taken at different locations of the AST depending upon whether the AST is horizontal,vertical, rectangular, and/or insulated.The final report should include field data, measurements, pictures, drawings,tables, and an inspection summary, and should specify the next scheduled inspection. Section 8 of the standard details the minimum inspection requirements for formal internal inspections, which are to be performed by a certified inspector.A formal internal inspection includes the requirements of an external inspection with some additional requirements for specific situations that are outlined in the standard. Double-wall tanks and secondary containment tanks may be inspected by checking the interstice for liquid or by other equivalent methods. For elevated ASTs where all external surfaces are accessible,the internal inspection may be conducted by examining the tank exterior using such methods as Ultrasonic Thickness Scans(UTS). For all other situations, entry into the interior of the AST is necessary. Internal inspection guidelines are detailed separately for horizontal ASTs and for vertical and rectangular ASTs in Sections 8.2 and 8.3 of the standard, respectively.Additional requirements for field-erected tanks are in Appendix B.The final report should contain elements similar to reports prepared for external inspections. SPCC GUIDANCE FOR REGIONAL INSPECTORS 7-65 December 16, 2013