Wisconsin Administrative Code › Department of Natural Resources › NR 500-599 - Environmental Protection - Solid Waste Management › Chapter NR 507 - Environmental Monitoring For Landfills › Section NR 507.22 - Gas monitoring

Current through June 24, 2024
(1) GAS MIGRATION. The department may require
				the owner or operator to install gas monitoring devices, to prepare and submit
				gas sampling and analysis programs and to monitor for gas migration. If
				explosive gases are detected in any gas monitoring well located outside of the
				limits of filling, the department may require any or all of the following: more
				frequent monitoring, monitoring for pressure or other parameters, and the
				installation of additional gas monitoring wells which may include nests of
				wells screened over shorter vertical intervals. Where monitoring is required,
				the owner or operator shall comply with all of the following:
(a)
Sampling parameters.
The
				owner or operator shall sample gas monitoring wells quarterly for percent
				methane and percent oxygen. Each time a well is sampled, the following shall be
				recorded: temperature, ground condition, barometric pressure, information as to
				whether the barometric pressure is rising or falling, and initial and
				stabilized methane levels. Initial readings are not required to be reported
				unless the stabilized reading for a particular monitoring point drops to
				zero.
(b)
Sampling.
Sampling shall be performed with properly calibrated
				instruments. When a gas monitoring well is being sampled, the gas monitoring
				instrument shall be attached to the well prior to opening the valve on the gas
				monitoring well.
(c)
Notification and remediation.
The owner or operator shall
				immediately notify the department and take all necessary steps to protect
				public health and welfare if a stabilized reading exceeds the lower explosive
				limit of any explosive gas generated by the waste fill in the soils outside of
				the limits of filling or air within 200 feet of the landfill property boundary
				or beyond the landfill property boundary, or 25% of the lower explosive limit
				in any facility structure, excluding gas control or recovery system components.
				Within 30 days of determining that the applicable gas level was exceeded, the
				owner or operator shall submit a remediation plan to the department describing
				the degree and extent of the problem and the proposed remedy. Within 60 days of
				determining that the applicable gas level was exceeded, the owner or operator
				shall implement the remediation plan. As additional requirements for owners or
				operators of landfills meeting the requirements of s.
				NR
				507.15(2), within 7 days of
				determining that the applicable gas level was exceeded, the operating record
				shall be updated to indicate the level detected and the steps taken to protect
				public health. The proposed remediation plan and notification of its
				implementation shall also be placed in the operating record. The department may
				upon written request, approve alternate schedules for submittal and
				implementation of the remediation plan.