Authority: IC 15-16-2-1.5

Affected: IC 15-16-2

Sec. 3. (a) The soil or foundation of an earthen storage structure shall have a maximum specific discharge permeability 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 permeability 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 storage structure must meet the following design standards as applicable:

1. (1) Indiana NRCS Conservation Practice Standard Code 521A: POND SEALING OR LINING – GEOMEMBRANE OR GEOSYNTHETIC CLAY LINER, November 2018*.
2. (2) Indiana NRCS Conservation Practice Standard Code 520: POND SEALING OR LINING – COMPACTED SOIL TREATMENT, October 2016*.
3. (3) Indiana NRCS Conservation Practice Standard Code 522: POND SEALING OR LINING – CONCRETE, October 2016*.

(c) Clay liners shall 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 or are available for review and copying at the Indiana Department of Environmental Management, Office of Legal Counsel, Indiana Government Center North, Thirteenth Floor, 100 North Senate Avenue, Indianapolis, Indiana 46204.

(State Chemist of the State of Indiana; 355 IAC 10-7-3; filed Mar 17, 2022, 12:13 p.m.: 20220413-IR-355210455FRA)