R 299.4433 Type II landfill operation; explosive gas control and monitoring.

Rule 433. (1) The owner and operator of a type II landfill shall ensure all of the following: (a) That the concentration of methane gas generated by the facility is not more than 25% of the lower explosive limit for methane in facility structures, excluding gas control or recovery system components, and the leachate collection system. (b) That the concentration of methane gas is not more than the lower explosive limit at or beyond the facility property boundary. (c) That gases generated by the facility do not create a nuisance and are not otherwise in violation of part 55 of the act at the property boundary. (2) The owner and operator of a type II landfill shall implement a routine methane monitoring program to ensure that the requirements of subrule (1) of this rule are met. The type and frequency of monitoring shall be based on all of the following factors: (a) Soil conditions. (b) The hydrogeologic conditions surrounding the facility. (c) The hydraulic conditions surrounding the facility. (d) The location of facility structures and property boundaries. (3) The minimum frequency of methane monitoring shall be quarterly. (4) If methane gas levels exceeding the limits specified in subrule (1) of this rule are detected from either an active or closed unit, the owner and operator shall do all of the following: (a) Immediately take all necessary steps to ensure protection of human health and notify the director. (b) Within 7 days of detection, place, in the operating record, the methane gas levels detected and a description of the steps taken to protect human health. (c) Within 60 days of detection, implement a remediation plan for the methane gas releases, place a copy of the plan in the operating record, and notify the director that the plan has been implemented. The plan shall describe the nature and extent of the problem and the proposed remedy. (5) The director may establish alternative schedules for demonstrating compliance under subrule (4) of this rule. (6) An active gas management system shall be installed at a type II landfill if necessary under subrule (4) of this rule. An active gas management system shall do all of the following: (a) Include a control system that includes 1 or both of the following: (i) A system within the unit that is in compliance with subrule (7) of this rule. (ii) A system outside the unit that is in compliance with subrule (8) of this rule. (b) Include a collection system for transporting gas to a central point or points for process or disposal. (c) Include provisions for collecting and draining gas condensate to the leachate collection and removal system. (d) Prevent the migration of gas out of the unit. (e) Operate until the waste is stabilized and no longer producing gas in quantities that are in violation of subrule (1) or (4) of this rule. (7) An active gas control system that is installed within the perimeter of a solid waste disposal unit shall be designed and constructed to do the all of the following: (a) Function for the active life of the disposal unit and the postclosure period. (b) Operate safely in hazardous or explosive environments. (c) Be resistant to corrosion by the constituents of landfill gas. (d) Withstand all normal landfill conditions, including settlement. (e) Provide for the collection and draining of gas condensate. (f) Not adversely affect the integrity of any liner, leachate collection system, or final cover. (g) Be airtight. (8) An active gas control system that is located outside the perimeter of the solid waste disposal unit shall consist of either trenches or gas wells which effectively cut off the lateral migration of gas and which extend down to 1 of the following: (a) A natural soil barrier that is in compliance with R 299.4912. (b) The seasonal high water table. (c) The elevation of the liner within the solid waste disposal unit. (d) Other barriers approved by the director.