(a) At a minimum, quarterly monitoring is required.

(b) For those MSWLF's that are permitted to accept for disposal 20 tons or less of municipal solid waste per day based on an annual average, the EA, with concurrence by the CIWMB, may reduce the frequencies for monitoring landfill gas after consideration of the unique characteristics of the MSWLF and its surroundings, climatic and hydrogeologic conditions, and protection of public health and safety and the environment. Any proposal by an operator for a reduced monitoring frequency shall be made available by the EA for public review for a minimum of 30 days to allow interested persons the opportunity to comment. The operator shall place in the operating record of the MSWLF documentation of the considerations, public comment, and EA approval and CIWMB concurrence for any alternative frequency. No reduced monitoring frequency shall be approved unless the EA and the CIWMB determine that the alternative monitoring schedule adequately protects the public health and safety and the environment. The Executive Director or the EA may condition, limit, suspend, or terminate an operator's use of an alternative monitoring frequency if s/he or it determines that the alternative frequency may cause harm to public health and safety or the the environment.