(A) All CDDLs must be constructed with a bottom and sidewall liner.
(B) Liners shall be constructed of soil with a minimum thickness of 24 inches. The low permeability soil component shall include a minimum of 12 contiguous inches of 1x10-7 centimeter per second maximum permeability material, or its equivalent. A professional engineer must certify that the completed liner complies with the permeability standard. The certification document shall include a minimum of four post construction tests per acre of constructed liner that supports the certification. All sampling, testing and certifications shall be performed by an independent entity(s). The test results shall be presented to the Solid Waste Coordinator before the liner inspection. (See § 50.117.)
(C) Liner construction may be staged in sections. Sections shall be no smaller than a quarter acre in size. The partial liner sections must possess sufficient edge to allow proper construction of a seam when the remaining portion of the liner is constructed. This edge must be protected from damage until a time that the seam is created. Each section shall be tested for liner permeability as outlined in division (B) above.
(D) The minimum bottom slope shall be 3% towards the leachate collection line and 1% along the leachate collection line.
(E) The lowest component of the CDDL liner shall be at least four feet above the seasonal high water table.
(F) The lowest component of the CDDL liner shall be at least two feet above the bedrock.
(G) A bearing layer of select CDD or other approved material, a minimum thickness of 24 inches, shall be deposited over the liner to protect it from damage caused by heavy machinery and/or other operational aspects. Bearing layer material shall be free from large objects or other debris that, when placed on the liner, could harm the integrity of the liner system. In addition, a professional engineer shall certify that the bearing layer possess enough permeability so as to not adversely affect the integrity of the leachate collection system. The bearing layer shall be installed prior to CDD disposal. This requirement can be can be superseded by a Cabinet approved drainage layer as per 401 KAR 48.060.
(Ord. KOC 97-830-53, passed 9-2-1997)