§ 277.257. Leachate collection system within protective cover.
(a) The leachate collection system within the protective cover shall meet the following performance standards. The leachate collection system shall:
(1) Ensure that free flowing liquids and leachate will drain continuously from the protective cover to the leachate treatment system without ponding or accumulating on the liner.
(2) Ensure that the depth of leachate on or above the primary liner does not exceed 1 foot.
(3) Withstand chemical attack from leachate.
(4) Withstand anticipated loads, stresses and disturbances from overlying waste, waste cover materials and equipment operation.
(5) Function without clogging.
(6) Cover the bottom and sidewalls of the facility.
(b) Unless alternative design requirements to the performance standards in subsection (a) are approved as part of the permit under § 271.231 (relating to equivalency review procedure), the leachate collection system within the protective cover shall comply with the following design requirements:
(1) The leachate collection system shall include a perforated piping system which is capable of intercepting free flowing liquids and leachate within the protective cover and conveying them to a collection sump for storage, processing or disposal. The collection sump shall be of sufficient size to transmit leachate that is generated and shall be capable of automatic and continuous functioning.
(2) The perforated piping system shall be sloped, sized and spaced to assure that free flowing liquids and leachate will drain continuously from the protective cover to the collection sump point.
(3) The minimum diameter of the perforated pipes shall be 6 inches with a wall thickness of Schedule 80 or greater as specified by ASTM, or equivalent.
(4) The leachate collection system shall contain stones or aggregates.
(5) The pipes shall be installed primarily perpendicular to the flow and shall have a postsettlement grade of at least 2%.
(6) The leachate collection system shall be cleaned and maintained as necessary.
(7) The leachate collection system shall have a minimum bottom slope of 2%.
Source The provisions of this § 277.257 amended December 22, 2000, effective December 23, 2000, 30 Pa.B. 6685. Immediately preceding text appears at serial pages (226308) to (226309).
Cross References This section cited in 25 Pa. Code § 277.161 (relating to liner system and leachate control plan); 25 Pa. Code § 277.164 (relating to application requirements for noncoal mine disposal); 25 Pa. Code § 277.251 (relating to scope and requirements); and 25 Pa. Code § 277.282 (relating to number, location and depth of monitoring points).
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