| http://www.w3.org/ns/prov#value | - essary emergency access to tanks, valves and other equipment, and safe egress from the diked enclosure.(A) Where the average height of the dike containing Category 1 or 2 flammable liquids, or Category 3 flammable liquids with a flashpoint below 100oF (37.8oC), is over 12 feet high, measured from interior grade, or where the distance between any tank and the top inside edge of the dike wall is les
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