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The above table from SP001 shows that Category 3 tanks must have the most complex and most <br />frequent inspections (with the associated costs for inspections), whereas Category 1 tanks have <br />the least inspection complexity. <br />Tank Examples <br />These few examples will show how to assign a tank to the various categories which then <br />determines the inspection requirements. <br />1. 1,100 gallon double-wall tank. Horizontal cylindrical on saddles. In the chart above, this <br />is a Category 1 tank and requires only Periodic AST inspections by the owner. <br />2. 3,500 gallon single-wall elevated horizontal tank in an earthen dike. In the chart above, <br />this is a Category 2 tank (does not have CRDM, but has secondary containment). The <br />tank requires Periodic AST inspections by the owner as well as both Formal External <br />Inspections by a certified inspector and leak tests by owner or owner's designee at 10 <br />year intervals. <br />3. 5,000 gallon single-wall tank in an earthen dike. Tank is vertical cylindrical and rests <br />directly on the ground. In the chart above, this is a Category 2 tank and requires Periodic <br />AST inspections by the owner as well as both Formal External Inspections by a certified <br />inspector and leak tests by owner or owner's designee at 10 year intervals. <br />4. 10,000 gallon single-wall tank without secondary containment of any type. Tank is <br />vertical cylindrical and rests directly on the ground. This is a Category 3 tank. In the chart <br />above two choices are given for inspection schedules. <br />6 <br />