Section 329IAC10-17-8. Drainage layer component and leachate collection pipes; design requirements

   (a) The drainage layer components of the liner systems described in section 2 of this rule must meet the following requirements:

(1) Be configured to allow for installation of a leachate collection pipe system that meets the design requirements of subsection (b).

(2) Have a design that adequately addresses prevention of clogging of the drainage system.

(3) Be capable of limiting, throughout the active life, closure, and post-closure period of the MSWLF, the level of leachate above the liner system to a maximum of one (1) foot under conditions expected to be present after the final cover has been placed.

(4) Consist of either of the following types of drainage material:

(A) Soil that:

(i) has a minimum thickness of twelve (12) inches and a minimum hydraulic conductivity of 1 × 10^-2 centimeters per second; and

(ii) is free of organic material except that organic material naturally occurring in the soil.

(B) Geosynthetic material that:

(i) is demonstrated to be chemically compatible with the waste and with the leachate generated by the waste;

(ii) has transmissivity that will not be impeded by the maximum compressive load of materials placed above the drainage layer; and

(iii) has a minimum transmissivity of 3 × 10^-5 meters² per second, using the appropriate safety factors and considering the long term creep impact, as specified under 329 IAC 10-15-8(a)(1).

  (b) The leachate collection pipes within the drainage layer must meet the following requirements:

(1) Pipes must have a minimum diameter of six (6) inches and a minimum slope of one percent (1%) toward the leachate storage areas or the conveying line.

(2) Pipes must be hydraulically designed to effectively remove leachate and provide conveyance of leachate to an appropriately designed storage or treatment facility throughout the active life, closure, and post-closure periods of the MSWLF.

(3) The chemical properties of the pipes must not be adversely affected by the waste or the leachate generated by the waste.

(4) Pipes must have adequate structural strength, as demonstrated by calculations prescribed in 329 IAC 10-15-8(a)(18), to support the maximum static and dynamic loads and stresses imposed by:

(A) the drainage layer;

(B) the protective cover;

(C) the waste;

(D) the final cover component; and

(E) any equipment used in the construction or operation of the MSWLF.

(5) The length of the leachate collection pipes must not exceed the capabilities of available clean-out devices or procedures.

  (c) The drainage layer design must meet any additional requirements necessary to obtain an adequate drainage layer as specified by the construction plans or as determined by the commissioner. (Solid Waste Management Division; 329 IAC 10-17-8; filed Mar 14, 1996, 5:00 p.m.: 19 IR 1836; filed Mar 19, 1998, 11:07 a.m.: 21 IR 2778; filed Aug 2, 1999, 11:50 a.m.: 22 IR 3817)