Section R. 299.4411 - Type II landfill location restrictions; groundwater isolationRule 411.
(1) The requirements of this rule apply to new disposal areas and all units at an existing disposal area that are or have been licensed under the act, including closed units.(2) A type II landfill shall maintain the following permanent minimum clearances from the top of the primary liner:(a) Ten feet to natural groundwater level.(b) Seven feet to a permanently depressed groundwater level.(3) Gravity interception of groundwater to control groundwater level may be utilized. The pumping of groundwater to control the groundwater level is not considered permanent and shall not be utilized.(4) The requirements of this rule do not apply to groundwater which is not capable of yielding significant quantities of water that is not an aquifer and which is located above natural soil that is in compliance with the requirements of R 299.4912, if all of the following conditions are met: (a) The liner system of the landfill extends into the clay or soil barrier.(b) Where feasible, gravity dewatering of the clay surface is employed.(c) The design includes a soil dike which is 10 feet wide, which is in compliance with the specifications of R 299.4913, and which is keyed into the lower confining layer.Mich. Admin. Code R. 299.4411