Ind. Admin. Code tit. 355, r. 2-5-2 – Walls

Sec. 2. (a) The walls of a secondary containment facility shall be:

(1) constructed of earth, steel, concrete (precasted modules or poured), or solid masonry; and
(2) designed to withstand a full hydrostatic head of any discharged liquid and weight load of material used in construction.

(b) Cracks and seams shall be sealed to prevent leakage.

(c) Walls constructed of earth or other permeable materials shall be lined as provided under sections 3 through 7 of this rule.

(d) Earthen walls shall have a horizontal-to-vertical slope consistent with good engineering practice. All interior slopes shall be protected with:

(1) flat road stone or a similar crushed stone material; or
(2) a minimum of six (6) inches of vegetative soils planted and maintained with shallow rooted grasses.

(e) The top of earthen walls shall be no less than two and one-half (2.5) feet wide.

(f) Walls may not exceed six (6) feet in height above interior grade unless provisions are made for:

(1) normal access and necessary emergency access to storage containers, valves, and other equipment; and
(2) safe exit from secondary containment.

(g) Walls constructed of concrete or solid masonry shall rest upon:

(1) a floating base of concrete prepared as in section 4 of this rule; or
(2) suitable concrete footings that extend below the average frost depth.

Joints between walls and base shall be made watertight.

(State Chemist of the State of Indiana; 355 IAC 2-5-2; filed Mar 8, 1991, 2:45 p.m.: 14 IR 1395, eff one hundred twenty (120) days after filing with secretary of state; filed Apr 23, 1998, 9:20 a.m.: 21 IR 3362, eff one hundred twenty (120) days after filing with secretary of state; readopted filed Jun 20, 2001, 3:20 p.m.: 24 IR 3822; filed Aug 10, 2005, 1:00 p.m.: 28 IR 3575; readopted filed Apr 27, 2007, 2:03 p.m.: 20070509-IR-355070039RFA; readopted filed Nov 13, 2013, 10:42 a.m.: 20131211-IR-355130442RFA; readopted filed Sep 19, 2019, 11:20 a.m.: 20191016-IR-355190392RFA; readopted filed Nov 4, 2025, 3:13 p.m.: 20251119-IR-355240618RFA)