Section 355IAC2-5-12. Drainage from contained areas within dikes; elephant rings instead of a diked containment area

   (a) Individual storage containers not exceeding three thousand (3,000) gallons may be contained within a secondary storage container (elephant ring) instead of a diked containment area.

  (b) Both the primary storage container and the elephant ring shall be fabricated of material compatible with:

(1) each other; and

(2) the fertilizer being stored.

  (c) The height of the elephant ring wall shall not exceed four (4) feet. The volume contained within the secondary storage walls up to the working height of the elephant ring shall be sufficient to contain a volume equal to the volume contained in the primary storage container plus the volume displaced by any equipment, that is, pumps or meters, placed within the secondary containment vessel up to the safe storage level of the elephant ring, plus a freeboard of six (6) inches, which freeboard is exempted if the containment system is protected from rainfall.

  (d) The elephant ring shall be free of leaks and structural defects. The base shall be:

(1) protected from corrosion, both from inside and outside; and

(2) designed according to good engineering practices.

  (e) All piping connections to the primary storage container shall be:

(1) made over the wall of the elephant ring; and

(2) adequately supported and braced.

Pumps and other fixtures, if located within the elephant ring containment structure, shall be placed on an elevated platform.

  (f) Accumulations of liquids shall be drained from the elephant ring over the wall of the container by means of a manually operated pump for use in the blending process or for proper 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 2-5-12; filed Mar 8, 1991, 2:45 p.m.: 14 IR 1397, eff one hundred twenty (120) days after filing with secretary of state; filed Apr 23, 1998, 9:20 a.m.: 21 IR 3364, eff one hundred twenty (120) days after filing with secretary of state; readopted filed Jun 20, 2001, 3:20 p.m.: 24 IR 3822; filed Aug 10, 2005, 1:00 p.m.: 28 IR 3577; readopted filed Apr 27, 2007, 2:03 p.m.: 20070509-IR-355070039RFA; readopted filed Nov 13, 2013, 10:42 a.m.: 20131211-IR-355130442RFA)