Section 327IAC20-5-3. Design requirements for liners

   (a) The soil or foundation of an earthen SMSS shall 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) meet the maximum specific discharge criteria;

(2) are over-excavated a minimum of six (6) inches; and

(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) Indiana NRCS Conservation Practice Standard Code 521A: Pond Sealing or Lining, Flexible Membrane, October 2013*.

(2) Indiana NRCS Conservation Practice Standard Code 521B: Pond Sealing or Lining, Soil Dispersant, October 2011*.

(3) Indiana NRCS Conservation Practice Standard Code 521C: Pond Sealing or Lining, Bentonite Sealant, October 2011*.

  (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. (Water Pollution Control Division; 327 IAC 20-5-3; filed Sep 28, 2015, 11:13 a.m.: 20151028-IR-327130245FRA)