62. During the operating period of a biogas collection system that has a gas pumping device pursuant to the second paragraph of section 32, the concentration of nitrogen or oxygen must be respectively less than 20% and 5% by volume in each drain and wet well in the system situated in every section of disposal areas that have received a final cover.
In addition, the concentration of methane at the surface of the disposal areas served by the system must be less than 500 ppm, in volume, in that operating period regardless of whether or not the areas have received a final cover.
The operation of a gas pumping device for the biogas produced in all or part of a disposal area may be halted if, throughout a period of 5 years, all the measurements of the methane generated by the residual materials in the disposal area show a concentration of less than 25% by volume.