A.
Post-closure Monitoring and Maintenance Plan. The licensee shall
submit a post-closure monitoring and maintenance plan to the Department as part
of the closure plan required in section 5. The plan must cover a period of at
least 30 years following closure unless extended by the Department due to
identified threats to public health, safety, or the environment..
The plan must outline how the applicant will meet the requirements of this
section, include a reporting format, and provide a detailed estimate of
post-closure monitoring and maintenance costs. Monitoring and inspections must
be performed in accordance with the plan. Changes to this plan must be approved
by the Department.
B.
Post-Closure Standards. The facility site may not contaminate
ground water outside the solid waste boundary and may not discharge
contaminants to surface water without a license pursuant to 38 M.R.S.A.
§413. Facilities that have implemented or are required to implement
corrective action(s) must demonstrate that successful corrective action will
occur prior to the end of the post-closure period.
(1)
Ground Water Monitoring.
Ground water must be monitored after closure in accordance with 06-096 CMR ch.
405.
(2)
Surface Water
Monitoring. Surface waters must be monitored after closure in accordance
with 06-096 CMR ch. 405.
(3)
Gas Monitoring. Gas monitoring must be conducted in accordance
with the gas management plan approved for the closure and post-closure period
under the requirements of section 5(I)(6) on a quarterly basis for the duration
of post-closure care until the Department approves a decrease or cessation in
monitoring frequency or parameters or both.
(4)
Leachate Monitoring and
Maintenance. Leachate and the leachate management system must be
monitored in accordance with the leachate management plan for the closure and
post-closure period approved under the requirements of section 5(I)(5).
Leachate collection and leak detection systems must be monitored every four
months after closure for quality and flow rates until the Department approves a
decrease or cessation in monitoring frequency or parameters or both. Provisions
must be made for continued leachate removal and treatment until the Department
approves a cessation in removal and treatment.
(5)
Stability and Settlement
Monitoring. Stability and settlement monitoring, as applicable, must
continue, and the results be reported to the Department, during the
post-closure period in accordance with the plan approved under the requirements
of section 5(I)(3) until the Department approves a cessation in monitoring. For
facilities that have been approved by the Department in accordance with section
2(F)(1) to use strength gain of the foundation soils in the stability
assessment and the factor of safety at the time of closure has not yet reached
1.5, the monitoring plan must include provisions for the owner to demonstrate
that the factor of safety has reached 1.5 before the end of the first five
years of the post-closure period. If this demonstration cannot be made, a plan
for corrective work must be submitted to the Department for approval so that a
factor of safety of at least 1.5 is attained.
(6)
Cover Monitoring and
Maintenance. The final cover must be monitored and maintained to prevent
ponding of water or erosion of cover materials and to otherwise maintain its
integrity. Vegetative cover must be mowed annually to prevent the growth of
deep rooted, woody plant species. Animal burrows into the cover must be
eliminated and the cover repaired as needed.
(7)
Restricted Access.
Provisions must be made to prevent the disposal of solid waste on the site and
to protect the integrity of the final cover system after closure.
(8)
Inspections. The landfill
must be inspected tri-annually after closure following the approved plan until
the Department approves a decrease in frequency or cessation of inspections.
Deficiencies noted during inspections must be corrected as soon as weather
conditions allow.
(9)
Rapid
Waste Mass Stabilization. Rapid waste mass stabilization approved as
part of landfill closure must provide for monitoring, maintenance, and
inspection of landfill facility components in accordance with the approved
proposal.
C.
Reporting Requirements. The licensee shall submit the results of
the monitoring and inspection requirements of this section to the Department.
For the first two years of post-closure, the results must be submitted after
each inspection. After the first two years, the results must be submitted
annually until the Department approves a decrease in reporting frequency.
Submittals must include the monitoring results. Deficiencies noted during
inspections must be summarized along with corrective measures taken or
proposed.
D.
Landfill
Reclamation. An owner must obtain a license pursuant to 06-096 CMR ch.
400 in order to conduct landfill reclamation activities at a closed
landfill.
