329 IAC 10-17-2 Overview of liner designs and criteria for selection of design

Sec. 2. (a) The following liner design is required for any section of a new MSWLF unit within an MSWLF or lateral expansion to be permitted under this article that will not be located over an aquifer of significance, as defined under 329 IAC 10-2-13, or will be located over an aquifer of significance, but there is a continuous layer of at least ten (10) feet of nonaquifer material, as defined under 329 IAC 10-2-120, separating the base of the proposed soil liner and the uppermost portion of the aquifer: (1) At the base and side slopes, starting from the subgrade and extending upward, the liner must include the following components: (A) A minimum of three (3) feet of compacted soil, having a hydraulic conductivity of 1 × 10-7 centimeters per second or less. (B) A geomembrane. (C) A drainage layer. (D) A protective cover. (2) At all sump areas, at a minimum, the liner must extend ten (10) feet from the outermost edge of the designated sump boundary on all sides. Starting from the subgrade and extending upward, the liner must include the following components: (A) A minimum of two (2) feet of compacted soil, having a hydraulic conductivity of 1 × 10-6 centimeters per second or less. (B) A leak detection zone. The leak detection zone must meet the applicable requirements in this section and sections 8, 9, and 13 through 16 of this rule for drainage layers. (C) A minimum of three (3) feet of compacted soil having a hydraulic conductivity of 1 × 10-7 centimeters per second or less. (D) A geomembrane. (E) A geosynthetic clay liner. (F) A geomembrane. (G) A drainage layer. (H) A protective cover. (b) The following liner design is required for any section of a new MSWLF unit or lateral expansion within an MSWLF to be permitted under this article that will be located over an aquifer of significance, as defined under 329 IAC 10-2-13, and there is not a continuous layer of at least ten (10) feet of nonaquifer material, as defined under 329 IAC 10-2-120, separating the base of the proposed soil liner and the uppermost portion of the aquifer: (1) At the base and side slopes, starting from the subgrade and extending upward, the liner must include the following components: (A) A minimum of two (2) feet of compacted soil, having a hydraulic conductivity of 1 × 10-6 centimeters per second or less. This component must extend up the side slope of the proposed MSWLF unit to a height at least two (2) feet above the highest temporal fluctuation of the ground water table, as determined from the hydrogeologic site investigation required under 329 IAC 10-15-4. (B) A drainage layer. This component must extend up the side slope of the proposed MSWLF unit to a height at least two (2) feet above the highest temporal fluctuation of the ground water table, but not closer than five (5) feet from the ground surface, as determined from the hydrogeologic site investigation required under 329 IAC 10-15-4. (C) A minimum of three (3) feet of compacted soil having a hydraulic conductivity of 1 × 10-7 centimeters per second or less. (D) A geomembrane. (E) A drainage layer. (F) A protective cover. (2) At all sump areas, at a minimum, the liner must extend ten (10) feet from the outermost edge of the designated sump boundary on all sides. Starting from the subgrade and extending upward, the liner must incorporate the design components described in subsection (a)(2). (c) For the purposes of this rule, sump areas are considered to be those areas of the proposed MSWLF unit that are designed to collect and remove leachate where leachate is expected to accumulate to a depth of at least one (1) foot. (d) The minimum distance for extension of liner design components related to sump areas may be increased at the discretion of the commissioner, depending on site-specific factors, with consideration of the highest temporal fluctuations of the ground water table at the site. (e) The commissioner may make available to the applicant standardized municipal solid waste landfill designs that are not less stringent than the requirements of this rule.