Code of Maine Rules › 06 - DEPARTMENT OF ENVIRONMENTAL PROTECTION › 096 - DEPARTMENT OF ENVIRONMENTAL PROTECTION - GENERAL › Chapter 401 - LANDFILL SITING, DESIGN, AND OPERATION › Section 096-401-6 - Post-Closure Monitoring and Maintenance

Current through 2024-29, July 17, 2024
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.