Section 329IAC10-18-1. Vertical expansions for municipal solid waste landfills

   (a) Applicants for a vertical expansion modification must include the following with the application:

(1) An environmental assessment of the proposed expansion area that addresses the following:

(A) The geology and ground water hydrology of the existing MSWLF site and adjacent areas.

(B) The most recent results from ground water monitoring, conducted in accordance with the requirements of the MSWLF's permit, using statistical methods required under the MSWLF's permit.

(C) Identification of adjacent land uses.

(2) Plot plans that are certified by a registered professional engineer and that:

(A) use a scale of at least one (1) inch per one hundred (100) feet for a MSWLF of less than eighty (80) acres;

(B) use a scale of at least one (1) inch per two hundred (200) feet for a MSWLF of eighty (80) acres or more;

(C) include a bar scale on each drawing;

(D) include elevations that correlate with United States Geological Survey (USGS) mean sea level data;

(E) include existing and newly proposed surface elevations within three hundred (300) feet of the facility boundaries;

(F) indicate the solid waste boundaries and the proposed final contours of the site using:

(i) intervals of no more than two (2) feet if the MSWLF is less than eighty (80) acres; and

(ii) intervals of no more than five (5) feet if the MSWLF is equal to or greater than eighty (80) acres; and

(G) indicate the MSWLF elevations over the six (6) months preceding the application submittal.

(3) Design information that addresses the following:

(A) A slope stability analysis for the proposed final slope.

(B) Total and differential settlement calculations of the MSWLF unit foundation incorporating new loadings.

(C) A foundation bearing capacity analysis if applicable.

(D) Surface water control in compliance with 329 IAC 10-15-8(a)(20) and 329 IAC 10-15-8(a)(21).

(E) Sedimentation and erosion control in compliance with 329 IAC 10-15-8(a)(17).

(4) Operational information that includes the following:

(A) A description of the type of operation.

(B) The number of acres currently permitted.

(C) The total number of acres filled at the time of application submittal.

(D) The quantity of waste received at the MSWLF in either cubic yards per day or tons per day.

(E) The type of waste received at the site.

(F) The additional volume of waste proposed for disposal at this MSWLF.

(5) Two (2) geologic cross sections, one (1) north-south and one (1) east-west, showing approved contours, proposed contours, and depth of waste placement.

(6) Documented evidence that the existing MSWLF unit to be vertically expanded has been constructed with, at a minimum, either of the following:

(A) Design features, including:

(i) a barrier layer that:

(AA) consists of at least ten (10) feet of material having a hydraulic conductivity of not more than 1 × 10^-6 centimeter per second, where the uppermost three (3) feet of this material has been recompacted to achieve an equivalent hydraulic conductivity of not more than 1 × 10^-7 centimeters per second; and

(BB) is directly beneath the waste; and

(ii) a leachate collection system approved by the commissioner as required by 329 IAC 2-10-3(1), which was repealed in 1996.

(B) An alternative design that is demonstrated, to the satisfaction of the commissioner, to be equivalent to the design standard in clause (A), such as:

(i) a vertical barrier wall with a leachate extraction system such that an inward gradient of the ground water flow across the wall is created; or

(ii) a design permitted under 329 IAC 2, which was repealed in 1996, that is demonstrated to be at least as stringent as the design standard described in 40 CFR 258.40.

(7) An operational plan for the proposed vertical expansion area, in accordance with the requirements of 329 IAC 10-15-6.

(8) The names and addresses of all owners or last taxpayers of record of property of adjoining land that is within one-half (½) mile of the solid waste boundary.

  (b) Applicants for a vertical expansion modification must comply with the following requirements in the application:

(1) Provide a description of the final cover that meets the requirements of 329 IAC 10-22-6 or 329 IAC 10-22-7, whichever is applicable.

(2) Meet the closure and post-closure requirements of 329 IAC 10-22 and 329 IAC 10-23.

(3) Meet all of the landfill gas control requirements of 329 IAC 10-20-17.

(4) Meet all of the financial assurance requirements of 329 IAC 10-39.

  (c) For the purpose of piggybacking, vertical expansion modification applications may be submitted for an alternative design under subsection (d)(1) or (d)(2) for MSWLF units that do not meet the requirements of subsection (a)(6).

  (d) The piggyback design consists of adjoining an existing MSWLF unit with an adjacent new MSWLF unit to gain airspace created between two (2) units. The following are requirements for an existing MSWLF unit:

(1) For an existing MSWLF unit that does not have a leachate collection system as described under 329 IAC 2-10-3(1), which was repealed in 1996, and that has not applied for a vertical expansion over the existing MSWLF unit that would exceed the maximum approved elevation of the existing MSWLF unit, the following is required:

(A) The existing MSWLF unit sideslopes that adjoin the new composite liner MSWLF unit must be constructed in the following manner with liner components starting from the top of the existing solid waste placement and extending upward:

(i) Twelve (12) inches of structural fill as described under 329 IAC 10-22-6(b).

(ii) Twenty-four (24) inches of compacted soil as described under 329 IAC 10-17-4 with a hydraulic conductivity of 1 × 10^-7 centimeter per second or less.

(iii) Twelve (12) inches of drainage layer as described under 329 IAC 10-17-8 with a hydraulic conductivity of 1 × 10^-2 centimeter per second or greater.

(iv) Six (6) inches of protective cover as described under 329 IAC 10-17-11.

(v) The commissioner may approve alternative liner designs or construction technologies under 329 IAC 10-17-15.

(B) Clean fill material as excluded under 329 IAC 10-3-1(1), restricted waste site Type IV waste as described under 329 IAC 10-9-4, or construction/demolition waste may be used to fill and smooth the contours between the MSWLF units.

(2) For an existing MSWLF unit that does not have a leachate collection system as described under 329 IAC 2-10-3(1), which was repealed in 1996, and a vertical expansion is proposed over the sideslopes of the existing MSWLF unit, the newly constructed composite liner MSWLF unit may adjoin only those sideslopes of the existing MSWLF unit that equal or exceed fifteen percent (15%). The existing MSWLF unit sideslopes that equal or exceed fifteen percent (15%) must be constructed in the following manner with liner components starting from the top of the existing solid waste placement and extending upward:

(A) Twelve (12) inches of methane gas venting layer as described under 329 IAC 10-22-6(b) with a hydraulic conductivity of 1 × 10^-3 centimeter per second or greater.

(B) Twenty-four (24) inches of barrier layer consisting of the following:

(i) The lower six (6) inches consisting of structural fill as described under 329 IAC 10-22-6(b).

(ii) The upper eighteen (18) inches consisting of compacted soil as described under 329 IAC 10-17-4 with a hydraulic conductivity of 1 × 10^-7 centimeter per second or less.

(C) Geomembrane as described under 329 IAC 10-17-6.

(D) Twelve (12) inches of drainage layer as described under 329 IAC 10-17-8 with a hydraulic conductivity of 1 × 10^-2 centimeter per second or greater.

(E) Eighteen (18) inches of protective cover as described under 329 IAC 10-17-11.

(F) The commissioner may approve alternative liner designs or construction technologies under 329 IAC 10-17-15.

In addition to this subdivision, the design must provide a perimeter leachate seep collection pipe located at the toe of the existing MSWLF unit where the existing MSWLF unit adjoins the new composite liner MSWLF unit.

(3) An existing MSWLF unit that has documented evidence of either design as described under subsection (a)(6)(A) through (a)(6)(B) may propose a piggyback design in accordance with this rule.

(4) Each piggyback design as described in subdivisions (1) and (2) and this subdivision must comply with the following:

(A) The final cover described under 329 IAC 10-22-6(b) must extend over the existing MSWLF unit piggyback.

(B) The design must include a surface water drainage system for the altered contours where the final cover systems of the adjoining MSWLF units intersect.

(C) The design must include erosion control measures for the altered contours where the final cover systems of the adjoining MSWLF units intersect.

(D) The design must include an analysis of the existing MSWLF unit subgrade bearing capacity to support the additional solid waste placement within the piggyback.

(E) The design must include an analysis of settlement in the existing MSWLF unit subgrade to prevent damage to the piggyback liner or the piggyback leachate collection system as defined under 329 IAC 2-10-3(1), which was repealed in 1996.

(F) The design must include an analysis of the existing MSWLF unit side slope stability to support the additional solid waste placement within the piggyback.

(G) The design must include a slope stability analysis of the piggyback liner and final cover at the interface of each component.

(H) The design must include an analysis of settlement of solid waste placement in the existing MSWLF unit to prevent damage to the piggyback liner or the piggyback leachate collection system as defined under 329 IAC 2-10-3(1), which was repealed in 1996.

(I) The design must include a methane gas management system beneath the piggyback liner system.

  (e) The commissioner may deny an application for a vertical expansion for a MSWLF that is implementing or has initiated a corrective action program under 329 IAC 10-21-13.

  (f) If, as a result of this article, there is an increase in the approved final closure elevations of an MSWLF unit to maintain minimum slope as required by 329 IAC 10-22, then the increase in the approved final closure elevations will not be considered a vertical expansion. The revised final closure elevations must be approved by the commissioner and must comply with the applicable provisions of 329 IAC 10-22. (Solid Waste Management Division; 329 IAC 10-18-1; filed Mar 14, 1996, 5:00 p.m.: 19 IR 1841; errata filed Apr 4, 1996, 4:00 p.m.: 19 IR 2046; filed Mar 19, 1998, 11:07 a.m.: 21 IR 2780; filed Aug 2, 1999, 11:50 a.m.: 22 IR 3820; readopted filed Aug 1, 2008, 10:28 a.m.: 20080827-IR-329080332BFA; readopted filed Aug 6, 2014, 9:49 a.m.: 20140903-IR-329140187BFA)