Section NR 507.11 - Gas monitoring well design and installationAll gas monitoring wells shall be designed, installed and documented in accordance with ss. NR 507.04, 507.05, and 507.06(1) (2) and 507.14 and the requirements of this section unless the department approves alternate methods in writing. All gas monitoring wells shall be designed, located, installed and maintained so as to obtain reliable and representative information regarding soil conditions and gas concentrations.
(1) TIMING OF INSTALLATION. Where gas monitoring is required, gas monitoring wells shall be installed at the same time that adjacent areas of the landfill liner are constructed.(2) DESIGN. All gas monitoring wells shall be constructed with a shut-off valve to prevent the escape of gas from the sampling device and minimize the amount of inflow of air from the atmosphere.(3) LOCATION. All gas monitoring wells shall meet both of the following: (a) Wells shall extend to the maximum depth of waste or to the low seasonal groundwater level whichever is encountered first. The screened length shall extend from 5 feet below ground surface to the bottom of the well.(b) Wells shall be located within 150 feet of the edge of waste unless otherwise approved by the department.Wis. Admin. Code Department of Natural Resources NR 507.11
Cr. Register, June, 1996, No. 486, eff. 7-1-96.