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14. Tank bottom waste. <br />15. Napthenes. <br />16. Leaded tank bottoms from the oil refining industry. <br />17. Mineral spirits. <br />18. Aromatics. <br />19. Transformer oil. <br />20. Dyes. <br />21. Drilling fluids. <br />22. Gasoline. <br />23. Diesel fuel. <br />24. Used oil that contains more than 1,000 ppm of total <br />halogens. <br />C. Storage and Treatment or Recycling in Tanks <br />1. Design of Tanks <br />a. The owner or operator shall construct all tanks <br />in accordance with the approved Operation Plan. <br />b. The owner or operator shall maintain the minimum <br />shell thickness specified in the approved <br />Operation Plan at all times to ensure sufficient <br />shell strength. <br />c. Prior to use, hazardous waste tanks and their <br />appurtenances shall be certified by a civil <br />engineer registered in California to be <br />structurally sound and of adequate construction <br />for the intended use. <br />d. Each hazardous waste tank and storage area shall <br />be individually marked with the internationally <br />recognized hazard identification system placards <br />developed by the National Fire Prevention <br />Association. <br />e. The total volume of hazardous waste stored in <br />tanks shall not exceed the designed capacity. <br />2. Containment <br />a. For all containment areas, the owner or operator <br />shall provide a spill containment system in <br />-11- <br />