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• <br />• <br />The frequency of periodic recoating (repainting) will be based upon <br />environmental factors in the geographic area where the tank is located. Give <br />special consideration when recoating to the selection of the coating, surface <br />preparation and coating application. Select a coating of industrial quality that <br />is compatible with the existing coating or else remove the existing coating <br />prior to recoating. <br />4.6 Quarterly, inspect and clean normal operating vents and emergency vents on <br />the primary tank (and secondary tank and secondary containment tank, if <br />applicable) and spill containers. Refer to Appendix for instructions. <br />4.7 Once a year, perform a walk-around inspection checking for proper drainage <br />around the tank area. Proper site maintenance is vital to ensure drainage of <br />surface water. Check for ground settling and puddling of water near the tank. <br />Correct as necessary. If ground conditions change or settlement occur, <br />correct the situation by providing drainage or regrading to prevent standing <br />water from being in contact with the steel tank and its supports. <br />4.8 Once a year, check o-ring/gasket of emergency vents for damage or <br />deterioration. <br />4.9 Once a year, inspect the tank supports to determine if there is damage or <br />deterioration of the supports. Inspect the supports for signs of damage from <br />vehicles, misuse, and corrosion. Damage may require replacement of the <br />supports. Contact the tank manufacturer for their recommendation. If <br />deterioration has occurred, more frequent inspections may be required. (See <br />paragraph 6.0 for further details.) Periodic recoating of the supports may be <br />necessary. <br />4.10 Once a year, inspect the tank foundation for signs of settlement, cracking, <br />pitting, and spalling. Contact a qualified contractor for repair of concrete <br />foundations. Observe the condition of the anchor bolts to determine if there <br />has been distortion of the bolts or significant cracking around the bolts. <br />Replace the bolts if they have deteriorated. <br />4.11 If a cathodic protection system has been installed on the tank to prevent <br />corrosion of the bottom of the tank, perform periodic readings of the system to <br />be sure that the protection remains adequate in accordance with local, state, <br />and federal guidelines. This procedure shall be performed by a qualified <br />cathodic protection tester. The criteria for protection shall be as defined by <br />NACE RP-0285, "Corrosion Control of Underground Storage Tank Systems <br />by Cathodic Protection." <br />0 AST Inspection Standard 4 <br />September 2000