Section 355IAC5-4-3. Base liners

   (a) The base of secondary containment shall be lined with concrete, steel, or other approved liners.

  (b) Concrete liners shall be designed according to good engineering practices to withstand any foreseeable loading conditions, including a full hydrostatic head of discharged fluid and static loads of storage containers, including appurtenances, equipment, and contents. Cracks and seams shall be sealed to prevent leakage.

  (c) Steel liners and installation plans shall be approved before use.

  (d) Synthetic liners and installation plans shall be approved before use.

  (e) Synthetic liners shall have a minimum thickness of thirty (30) mils (eight-tenths (0.8) millimeter) and be chemically compatible with the materials being stored within the containment.

  (f) Synthetic liners shall be installed under the supervision of a qualified representative of the manufacturer, and all field constructed seams shall be tested and repaired, if necessary, in accordance with the manufacturer's recommendations. (State Chemist of the State of Indiana; 355 IAC 5-4-3; filed Mar 8, 1991, 2:45 p.m.: 14 IR 1406, 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)