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 D.
Subpart D -- Design Criteria
The proposed design criteria establishes a
performance standard that allows State flexibility in
determining the allowable risk level and the point of
compliance. New and existing units would be required to
meet the performance standard but different options for
control mechanisms are given for each.
New units would be required to be designed with
liners, leachate collection systems, and final cover
systems as necessary to meet a State-established alterna-
tive boundary. The alternative boundary would be no more
than 150 meters from the waste management unit boundary
and would be required to be on facility-owned land.
Existing units would be required to install a final
cover that prevents infiltration of liquid into the
waste, but would not be required to install liners or
leachate collection systems.
E.
Subpart F -- Ground-Water Monitoring and Corrective
Action
This Subpart proposes a two-phased ground-water
monitoring system and corrective action requirement to
ensure that ground-water contamination as new and
existing MSWLFs will be detected and cleaned up as
necessary to protect human health and the environment.
These requirements would be applicable to all new and
existing MSWLF units. In Phase I monitoring, the owner
or operator would monitor for specified constituents. If
contamination is detected, the owner or operator would be
required to comply with Phase II monitoring requirements
and monitor for additional constituents.
Existing landfill units would be exempt from
groundwater monitoring only if the owner or operator
could demonstrate to the State that there is no potential
for migration of hazardous constituents from the unit to
the uppermost aquifer during the active life of the unit
and the post-closure care period.
States would be required to specify a schedule for
all units in the State to be in compliance with the
ground-water monitoring requirements. Ground-water
monitoring would be conducted throughout the active life,
as well as, during closure and the post-closure care
periods for that unit. The State would have final
approval for the ground-water monitoring well system at
each unit.
The owner or operator would be required to conduct
a corrective action assessment if the Phase II
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