(a) The following requirements apply to leachate collection pipes:

1. (1) The primary and secondary leachate collection and removal system and the gas collection condensate piping system must be designed and built to allow for representative sampling of leachate and condensate and to operate with proper maintenance without clogging during the landfill’s active life and post-closure care period. The primary collection pipe network must be sized for peak flow attributed to a 24-hour-25-year storm to be removed from the landfill cell within 7 days or less.
2. (2) All leachate collection pipe networks located in the primary and secondary leachate collection and removal systems must be designed to allow for accessibility of equipment for effective video monitoring, routine cleaning and maintenance of key collection lines in each separately operating cell.
3. (3) All leachate conveyance lines, gas condensate lines and appurtenances, including manholes, sumps, and metering pits located outside the liner system of the landfill must be designed to have double containment and must be constructed to provide for effective leak detection and collection.

4. (4) Leachate conveyance lines, gas condensate lines and appurtenances including manholes, sumps, and metering pits located outside the landfill liner system are not required to maintain the minimum separation of 5 feet from the seasonal high groundwater table, and are not required to maintain the minimum separation of 10 feet from bedrock.

   (b) Materials required.

   The leachate collection pipes must:

5. (1) be a minimum of eight inches in inside nominal diameter for primary pipes and six inches in inside nominal diameter for secondary pipes;
6. (2) have adequate structural strength to support the maximum static and dynamic loads and stresses that will be imposed by the overlying material, including the drainage layer, liners, waste material, and any equipment used in the construction and operation of the landfill; and

7. (3) be chemically compatible with leachate.

   (c) Construction requirements.

   Leachate collection pipes must be installed in accordance with the requirements of the approved engineering drawings, reports, and specifications and must be designed to have a minimum slope of one percent.

   (d) Certification requirements.

   The project engineer must certify that the requirements of paragraphs 363-6.6(a)(3) and (4) of this Subpart are met and that all leachate collection pipes are cleaned, debeaded and inspected upon completion of construction using video inspection equipment or other methods acceptable to the department to verify that the system is free of obstructions and construction-related debris.