18 AAC 60.350. Control of explosive gases

(a) The owner or operator of a Class I or Class II MSWLF shall ensure that the concentration of methane gas generated by the facility does not exceed

(1) 25 percent of the lower explosive limit for methane in facility structures, excluding gas control or recovery system components; and

(2) the lower explosive limit for methane at the facility property boundary.

(b) The owner or operator of a MSWLF that contains more than 30,000 cubic yards of municipal solid waste, not including ash from a municipal solid waste incinerator, shall implement a routine methane monitoring program to ensure that the maximum allowable concentrations established in (a) of this section are not exceeded in any structure where the release of a gas is because of the landfill. The type and frequency of monitoring must be at least quarterly and must be based on the following factors:

(1) soil conditions;

(2) the hydrogeologic conditions underlying the facility and adjacent property;

(3) the hydraulic conditions underlying the facility and adjacent property; and

(4) the location of facility structures and property boundaries.

(c) If methane gas levels exceeding the limits set in (a) of this section are detected, the owner or operator shall immediately notify the department by telephone and in writing, and shall take all necessary steps to reduce or dissipate the concentrations of methane to ensure the public health, safety, and welfare.

(d) Within 60 days after detection under (c) of this section, the owner or operator shall implement a long-term remediation plan for the methane gas releases, place a copy of the plan in the operating record, and submit written notification to the department that the plan has been implemented.

(e) The owner or operator of a MSWLF that contains less than 30,000 cubic yards of municipal solid waste, not including ash from a municipal solid waste incinerator, shall institute an explosive gas control program in compliance with this section if the department finds that gas control or monitoring is necessary to ensure that there will be no explosion hazard.

History: Eff. 1/28/96, Register 137; am 10/29/98, Register 148; am 9/7/2002, Register 163

Authority: AS 44.46.020

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