Section 355IAC5-4-7. Alternative to secondary containment for storage containers of 3,000 gallons or less

   (a) Individual storage containers not exceeding three thousand (3,000) gallons may be contained within an elephant ring in lieu of secondary containment.

  (b) Both the storage container and the elephant ring shall be fabricated of materials compatible with each other and with the pesticide being stored. The storage container and the elephant ring shall be constructed of similar metals. Elephant rings shall not be constructed of plastic.

  (c) The height of the elephant ring wall shall not exceed four (4) feet. The minimum capacity of the elephant ring shall be one hundred percent (100%) of the volume of the storage container plus the volume displaced by all equipment, and appurtenances in the secondary containment vessel up to the safe storage level of the elephant ring, plus a freeboard of six (6) inches. An elephant ring protected from rainfall is not required to have the freeboard of six (6) inches.

  (d) The elephant ring shall be free of leaks and structural defects. The base shall be protected from corrosion, both from inside and outside, and shall be underlain by a concrete pad or by eight (8) inches of compacted gravel beneath four (4) inches of compacted sand or as recommended by the manufacturer of the elephant ring and approved by the state chemist.

  (e) The elephant ring shall not have a relief outlet or valve. No appurtenances shall extend through the wall of the elephant ring. Pumps located within the elephant ring shall be placed on an elevated platform.

  (f) Liquid shall be removed from the elephant ring by means of a manually activated pump for use in the blending process or disposal in accordance with all applicable regulations.

  (g) Elephant rings shall be maintained as necessary to assure compliance with this rule. (State Chemist of the State of Indiana; 355 IAC 5-4-7; filed Mar 8, 1991, 2:45 p.m.: 14 IR 1407, eff sixty (60) days after filing with secretary of state; readopted filed Nov 21, 2001, 10:17 a.m.: 25 IR 1269; filed Feb 20, 2002, 9:38 a.m.: 25 IR 2218; readopted filed Sep 3, 2008, 1:46 p.m.: 20080924-IR-355080553RFA; readopted filed Oct 17, 2014, 9:26 a.m.: 20141112-IR-355140342RFA)