Mich. Admin. Code R. 299.4411 - Type II landfill location restrictions; groundwater isolation
Rule 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.
Notes
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