1. (a) Fluid fertilizer storage containers must be located within secondary containment constructed with a base, perimeter wall, and sloped floor. However, an exception for the sloped floor requirement may be granted by the state chemist.
2. (b) The containment area must be separate from a secondary containment area for other materials and used only for containment of fluid fertilizer containers or other fertilizer related equipment. This subsection does not prohibit the storage within the diked area of anhydrous ammonia when stored in compliance with rules adopted under IC 15-16-1 . Adjoining secondary containment areas may share common walls.
3. (c) Secondary containment not protected from rainfall must 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.
4. (d) Secondary containment protected from rainfall is not required to have the freeboard required in subsection (c) but must comply with all other requirements of this chapter.
5. (e) A secondary containment constructed before July 6, 1991, and having 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 are deemed to be in compliance with this chapter. Any such storage facility that alters the secondary containment area or increases in storage container volume must be brought into full compliance within ninety (90) days of an alteration to the secondary containment area or increase in the storage container volume.
6. (f) Tile drainage is not be permitted within or under secondary containment.
7. (g) Alternative means of secondary containment, with prior approval of the state chemist, may be permitted.

As added by P.L.98-2026, SEC.50.