Sec. 67. (a) "Enforcement action", for purposes of IC 13-20-13 and IC 13-20-14, means:
(1) a written notice of a violation or a commissioner's order issued under IC 13-30-3;
(2) a letter identifying a violation; or
(3) a court proceeding initiated by the:
(A) department;
(B) department of homeland security;
(C) state; or
(D) federal government;
under an environmental protection law or other law concerning public health, safety, or the environment.
(b) "Enforcement action", for purposes of IC 13-25-5, means:
(1) a written notice of violation issued under IC 13-30-3-3, IC 13-30-3-4, or IC 13-7-11-2 (before its repeal) that requires or involves the removal or remediation of petroleum or a hazardous substance;
(2) another written notice that requires the removal or remediation of petroleum or a hazardous substance and that is:
(A) issued under:
(i) IC 4-21.5-3-6;
(ii) IC 4-21.5-3-8; or
(iii) IC 4-21.5-4; or
(B) substantially equivalent to a special notice letter issued under 42 U.S.C. 9622(e); or
(3) a similar notice issued by the federal government.