N.M. Code R. § 20.9.5.10
ADDITIONAL CONSTRUCTION AND DEMOLITION LANDFILL OPERATING REQUIREMENTS. All construction and demolition landfill owners and operators shall:
C. prevent the generation and lateral migration of methane such that:
(1) the concentration of methane generated by the facility does not exceed 25 percent of the lower explosive limit (LEL) for methane in facility structures (excluding gas control or recovery system components); and
(2) the concentration of methane does not exceed the LEL at the property boundary; and
[20.9.5.10 NMAC - Rp, 20 NMAC 9.1.IV.403, 8/2/2007]