Okla. Admin. Code § 252:515-13-31

Current through Vol. 41, No. 19, June 17, 2024

Section 252:515-13-31 - Leachate collection system design

(a)Design plan required. A design plan for a leachate collection system consisting of a piping network overlain with a drainage layer or a geonet and a protective layer, meeting the requirements of this Section as well as OAC 252:515-13-32 and 33 shall be included in the permit application.

(b)Performance standard. Leachate volume shall be estimated, and the leachate collection system shall be designed to:

(1) maintain one foot or less of head above the top of the liner; and

(2) drain leachate toward the perimeter of the disposal area.

(c)Contents of plan. The plan shall fully describe the design and operation of the leachate collection system and management of removed leachate, and shall include:

(1) calculations or demonstrations to show the collection system will adequately dewater the waste mass and that clogging of the system will not occur;

(2) a narrative detailing the proposed construction;

(3) how penetration of the liner will be minimized. If the leachate collection design requires clean-out or collection pipes to penetrate the geomembrane, the penetration should be designed and constructed to allow nondestructive quality control testing of 100% of the seal between the pipe and the geomembrane. Plans for recompaction and testing of the clay liner component that is penetrated must be provided;

(4) a method for routine cleaning of the header pipe;

(5) a listing of materials to be utilized in the construction of the leachate collection system;

(6) drawings and specifications of the proposed leachate collection and management system at a scale which clearly shows the following:

(A) a plan view of the leachate collection system design plotted on a copy of the top of liner contour map;

(B) the location of all piping, cleanouts, manholes, sumps, risers, trenches, tanks, pumps, and other appurtenances;

(C) the general layout of the collection system with approximate grades; and

(D) other information as requested by the DEQ;

(7) a leachate removal system that includes a positive method of leachate extraction in sumps, manholes and risers in order to remove leachate in excess of the maximum allowable head.

(A) Valves, ports or appurtenances to introduce biocides and/or cleaning solutions shall be provided as necessary.

(B) The DEQ may require automatic and continuous removal of leachate during the active life if the owner/operator repeatedly fails to maintain one foot or less of head or less on the liner;

(8) a description of the QA/QC plan for the system installation, including methods for ensuring liner integrity if there is a potential the liner will be breached during construction; and

(9) a description of the method of leachate management pursuant to Part 5 of this Subchapter, including necessary drawings, calculations, and other pertinent data to demonstrate compliance with the method(s) selected.

(d)Construction materials. The leachate collection system shall be constructed from materials capable of withstanding both chemical attack resulting from the anticipated leachate, and the maximum overburden anticipated.

(e)Alternative design. An alternative leachate collection system design may be approved by the DEQ upon successful demonstration the alternative design meets performance and design standards of this Part.

Okla. Admin. Code § 252:515-13-31

Added at 20 Ok Reg 1151, eff 6-1-03