Authority: IC 13-14-8-7; IC 13-15-2-1; IC 13-18-10.5

Affected: IC 13-11-2; IC 13-14; IC 13-15; IC 13-18; IC 13-30

Sec. 3. (a) The soil or foundation of an earthen SMSS must have a maximum specific discharge of one-sixteenth (1/16) in3/in2/day, 1.8x10-6cm3/cm2/sec. This requirement may be satisfied by soil testing that shows a minimum of three (3) feet of in situ soils that:

1. (1) meet the maximum specific discharge criteria;
2. (2) are over-excavated a minimum of six (6) inches; and
3. (3) are recompacted to break up the existing macropore structure.

(b) If there is not at least three (3) feet of in situ soils that meet the maximum specific discharge criteria in subsection (a), a liner must be used. Except for clay liners described in subsection (c), liners used in a SMSS must meet the following design standards as applicable:

1. (1) Indiana NRCS Conservation Practice Standard Code 520: Pond Sealing or Lining, Compacted Soil Treatment, October 2016*.
2. (2) Indiana NRCS Conservation Practice Standard Code 522: Pond Sealing or Lining – Concrete, October 2016*.

(c) Clay liners must be a minimum of one (1) foot thick and have a maximum specific discharge of one-sixteenth (1/16) in3/in2/day, 1.8x10-6cm3/cm2/sec.

*These documents are incorporated by reference. Copies may be obtained from the Indiana NRCS State Office, 6013 Lakeside Boulevard, Indianapolis, IN 46278, online at http://nrcs.usda.gov/, or are available for review at the Indiana Department of Environmental Management, Office of Legal Counsel, Indiana Government Center North, Thirteenth Floor, 100 North Senate Avenue, Indianapolis, Indiana 46204.

(Water Pollution Control Division; 327 IAC 20-5-3; filed Sep 28, 2015, 11:13 a.m.: 20151028-IR- 327130245FRA; readopted filed May 18, 2021, 1:04 p.m.: 20210609-IR-327210118BFA; filed May 23, 2022, 9:29 a.m.: 20220622-IR-327210028FRA; readopted filed Oct 18, 2024, 1:57 p.m.: 20241113-IR-327230810RFA)