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• <br /> <br />recommended by the qualified tank inspector <br />6.1.4 If the remaining wall thickness is greater than or equal to 75% of <br /> the original thickness, re-inspect the tank in 10 years, or less as <br /> recommended by the qualified tank inspector. <br />6.2 Sugges ted methods of determining the original thickness are as follows: <br />6.2.1 Review the original tank documentation, such as drawings and <br /> packing lists. <br />6.2.2 Consult the tank manufacturer. <br />6.2.3 Examine the tank labels for evidence of a widely accepted tank <br /> standard, such as Underwriters Laboratories Standard UL 142, etc. <br /> Consult the referenced standard to determine the minimum design <br /> wall thickness. <br />6.2.4 Measure the tank thickness of several areas of the tank which have <br /> no visible corrosion or pitting. The smallest of these measurements <br /> will result in a minimum design thickness which can be used. <br />7.0 RECORD KEEPING <br />7.1 Keep records of Periodic Inspections (performed by tank owner or his <br />designate) for the previous year and the current year or as required by local, <br />state, and federal guidelines. Refer to the section of this document called, <br />"Checklists" for suggested records format. <br />7.9.1 Keep results of the last two inspections of a cathodic protection <br />system, if applicable. <br />7.2 Keep records of any "Critical Situation", as defined in paragraph 41 above, <br />for the entire life of the tank. <br />7.3 Keep records of the Certified Inspection (performed by Qualified Tank <br />Inspector, as defined in paragraph 3.2) for the entire life of the tank. Refer <br />to the section of this document called, "Checklists" for suggested records <br />format. <br />0 AST Inspection Standard 8 <br />September 2000