Sec. 15. The base of a secondary containment facility and any earthen walls must be lined with: (1) concrete; (2) steel; (3) a synthetic liner approved by the state chemist; or (4) a clay soil liner. As added by P.L.98-2026, SEC.50.
Secondary containment lining
Ind. Code § 15-16-3.3-15, under Storage and Containment.
Ind. Code § 15-16-3.3-15