The owner or operator shall measure methane gas concentrations quarterly in all buildings and at the property boundaries. Methane gas may not exceed 25 percent of the lower explosive limit (LEL) of the gas in facility structures, excluding methane gas system components and may not exceed the LEL of the gas in soils or air at the property boundary.
Facilities which exceed these methane gas concentration levels shall take the following actions;
S.D. Admin. R. 74:27:13:26
General Authority: SDCL 34A-6-1.6.
Law Implemented: SDCL 34A-6-1.6.