(1) The owner or operator of a municipal solid waste landfill with a gas collection and control system must conduct instantaneous or integrated surface monitoring of the landfill surface according to the requirements specified in implementing rules adopted by the department pursuant to RCW 70A.540.020.

(2) The owner or operator of a municipal solid waste landfill with a gas collection and control system must monitor the gas control system according to the requirements specified in implementing rules adopted by the department pursuant to RCW 70A.540.020.

(3) The owner or operator of a municipal solid waste landfill with a gas collection and control system must monitor each individual wellhead to determine the gauge pressure according to the requirements specified in implementing rules adopted by the department pursuant to RCW 70A.540.020.