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<br />4.0 PERIODIC INSPECTION (PERFORMED BY TANK OWNER OR HIS <br />DESIGNATE) <br />4.1 The following situations are considered Critical Situations. These REQUIRE <br />IMMEDIATE ATTENTION. Inspect the tank for serviceability and make <br />corrections as required prior to returning it to service. <br />4.1.1 Take a tank out of service immediately (within 24 hours) if a leak is <br />found in the tank at any time. Repair or replace the tank. Consult <br />the tank manufacturer prior to making any alterations or repairs to a <br />tank. <br />4.1.2 If the tank has been exposed to a fire or other means which could <br />cause possible damage, inspect the tank for serviceability and <br />leaks prior to being put into service. Follow the inspection criteria <br />described in paragraph 5.0 below. Make corrections and/or repairs <br />as required. Consult the tank manufacturer prior to making any <br />alterations or repairs to a tank. <br />4.1.3 Check for proper drainage during or after a major storm in <br />accordance with paragraph 4.6 below. <br />4.2 Monthly, check the primary tank for the presence of water at the lowest <br />possible point(s) inside the tank. In addition, check the secondary tank or <br />secondary containment if the aboveground tank is so equipped. Remove any <br />water found. Bacteria in the water can cause corrosion and plug filters. If <br />water is found in a tank, check for the presence of corrosion inducing bacteria <br />using a microbe detection kit. If bacteria are present, treat with a suitable <br />bactericide. See the US Department of Energy BNL 48406, a report which <br />provides additional information. Remove a tank from service that has a <br />known leak in either the primary or secondary tank or secondary containment. <br />4.3 Monthly, inspect the interstice of a double wall tank for the presence of fuel. If <br />tank is so equipped, check the leak detection system and replace or correct <br />as necessary. Check groundwater wells if the tank is so equipped. Remove a <br />tank from service that has a known leak in either the primary or secondary <br />tank or secondary containment. <br />4.4 Monthly, inspect all pipe connections to the tank for evidence of leakage. <br />Replace the gaskets in flanged connections, as necessary, with ones <br />compatible with the stored fluid and rated to cover the temperature extremes <br />of the tank environment. Tighten threaded connections if necessary. <br />4.5 Quarterly, perform a walk-around inspection to identify and repair areas of <br />damage to the tank or its coating. Clean the exterior if necessary. Promptly <br />repair any deficiencies that are found. It is important that the tank exterior be <br />inspected periodically to ensure that the integrity of the coating is maintained. <br />AST Inspection Standard 3 September 2000