Section NR 507.22 - Gas monitoring(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.(2) GAS EXTRACTION. The department may require the owner or operator to install monitoring ports and conduct monitoring activities to determine the effectiveness of any gas extraction or venting system.(3) REPORTING. Unless otherwise approved by the department, the owner or operator shall report gas monitoring results to the department no less frequently than semi-annually and in accordance with s. NR 507.26(3).Wis. Admin. Code Department of Natural Resources § NR 507.22
Cr. Register, June, 1996, No. 486, eff. 7-1-96; CR 05-020: rn. to (1) and am., cr. (2) and (3) Register January 2006 No. 601, eff. 2-1-06.