310 CMR, § 19.113
Landfill final cover systems designed using components, materials, technologies or methodologies other than those expressly provided for under 310 CMR 19.112: Landfill Final Cover Systems, may be approved by the Department provided that either the proponent affirmatively demonstrates to the Department's satisfaction that the alternative final cover system design meets the standards established under 310 CMR 19.105: Equivalency Review Standards and Procedures, or, as a result of a site-specific assessment, performed pursuant to 310 CMR 19.150: Landfill Assessment Requirements, the Department determines that an alternative design would adequately protect public health, safety and the environment. The final cover material used in an alternative final cover designed for a landfill that accepted waste after October 9, 1991, shall have a maximum hydraulic conductivity of 1 X 10-5 cm/sec.
310 CMR, § 19.113