Section 355IAC5-4-1. General requirements

   (a) Liquid pesticide storage containers shall be located within secondary containment constructed with a base, perimeter wall, and sloped floor. Exception for a sloped floor may be granted by the state chemist.

  (b) The containment area shall be separate from a secondary containment area for other materials and used only for containment of liquid pesticide storage containers or other pesticide related equipment. Adjoining secondary containment areas may share common walls.

  (c) Secondary containment not protected from rainfall shall at all times have a minimum capacity of one hundred percent (100%) of the volume of the largest storage container within the contained area plus the volume displaced by all the other tanks, equipment, and appurtenances in the area up to the safe design level of the containment structure plus a freeboard of six (6) inches.

  (d) Secondary containment protected from rainfall is not required to have the freeboard noted in subsection (c), but shall comply with all other requirements therein.

  (e) Secondary containment constructed prior to enactment of this rule and that has a capacity of a minimum of one hundred ten percent (110%) of the volume of the largest storage container within the contained area plus the volume displaced by all the other tanks in the area up to the safe design level of the containment structure shall be deemed to be in compliance with this rule. Any such storage facility upon alteration of the secondary containment area or increases in storage container volume shall be brought into full compliance within ninety (90) days of alteration or increase.

  (f) Tile drainage shall not be permitted within or under secondary containment. (State Chemist of the State of Indiana; 355 IAC 5-4-1; filed Mar 8, 1991, 2:45 p.m.: 14 IR 1405, 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 2217; readopted filed Sep 3, 2008, 1:46 p.m.: 20080924-IR-355080553RFA; readopted filed Oct 17, 2014, 9:26 a.m.: 20141112-IR-355140342RFA)