NR 440.75(2)(x)(x) “Sludge” means any solid, semisolid or liquid waste generated from a municipal, commercial or industrial wastewater treatment plant, water supply treatment plant or air pollution control facility, exclusive of the treated effluent from a wastewater treatment plant. NR 440.75(2)(y)(y) “Solid waste” means any garbage, sludge from a wastewater treatment plant, water supply treatment plant, or air pollution control facility and other discarded material, including solid, liquid, semisolid or contained gaseous material resulting from industrial, commercial, mining, and agricultural operations, and from community activities, but does not include solid or dissolved material in domestic sewage, or solid or dissolved materials in irrigation return flows or industrial discharges that are point sources subject to permits under 33 USC 1342, or source, special nuclear, or by-product material as defined by the Atomic Energy Act, 42 (USC 2011 to 2259). NR 440.75(2)(ym)(ym) “Sufficient density” means any number, spacing and combination of collection system components, including vertical wells, horizontal collectors, and surface collectors necessary to maintain emission and migration control as determined by measures of performance set forth in this section. NR 440.75(2)(z)(z) “Sufficient extraction rate” means a rate sufficient to maintain a negative pressure at all wellheads in the collection system without causing air infiltration, including any wellheads connected to the system as a result of expansion or excess surface emissions, for the life of the blower. NR 440.75(3)(3) Standards for emissions from municipal solid waste landfills. NR 440.75(3)(a)(a) Each owner or operator of an MSW landfill having a design capacity less than 2.5 million megagrams by mass or 2.5 million cubic meters by volume shall submit an initial design capacity report to the department as provided in sub. (8) (a). The landfill owner or operator may calculate design capacity in either megagrams or cubic meters for comparison with the exemption values. Any density conversions shall be documented and submitted with the report. Submittal of the initial design capacity report shall fulfill the requirements of this section except as follows: NR 440.75(3)(a)1.1. The owner or operator shall submit to the department an amended design capacity report, as provided for in sub. (8) (a) 3. NR 440.75(3)(a)2.2. When an increase in the maximum design capacity of a landfill results in a revised maximum design capacity equal to or greater than 2.5 million megagrams and 2.5 million cubic meters, the owner or operator shall comply with the provision of par. (b). NR 440.75(3)(b)(b) Each owner or operator of an MSW landfill having a design capacity equal to or greater than 2.5 million megagrams and 2.5 million cubic meters, shall either comply with subd. 2. or calculate an NMOC emission rate for the landfill using the procedures specified in sub. (5). The NMOC emission rate shall be recalculated annually, except as provided in sub. (8) (b) 2. The owner or operator of an MSW landfill subject to this section with a design capacity greater than or equal to 2.5 million megagrams and 2.5 million cubic meters is subject to ch. NR 407 permitting requirements. NR 440.75(3)(b)1.1. If the calculated NMOC emission rate is less than 50 megagrams per year, the owner or operator shall do the following: NR 440.75(3)(b)1.b.b. Recalculate the NMOC emission rate annually using the procedures specified in sub. (5) (a) 1. until such time as the calculated NMOC emission rate is equal to or greater than 50 megagrams per year, or the landfill is closed. 1) If the NMOC emission rate, upon recalculation, is equal to or greater than 50 megagrams per year, the owner or operator shall install a collection and control system in compliance with subd. 2.
2) If the landfill is permanently closed, a closure notification shall be submitted to the department as provided for in sub. (8) (d).
NR 440.75(3)(b)2.2. If the calculated NMOC emission rate is equal to or greater than 50 megagrams per year, the owner or operator shall do all of the following: NR 440.75(3)(b)2.a.a. Submit a collection and control system design plan prepared by a professional engineer to the department within one year. 1) The collection and control system as described in the plan shall meet the design requirements of subd. 2. b.
2) The collection and control system design plan shall include any alternatives to the operational standards, test methods, procedures, compliance measures, monitoring, recordkeeping or reporting provisions of subs. (4) to (9) proposed by the owner or operator.
3) The collection and control system design plan shall either conform with specifications for active collection systems in sub. (10) or include a demonstration to the department’s satisfaction of the sufficiency of the alternative provisions to sub. (10).
4) The department shall review the information submitted under subd. 2. a. 1) to 3) and either approve it, disapprove it, or request that additional information be submitted. Because of the many site-specific factors involved with landfill gas system design, alternative systems may be necessary. A wide variety of system designs are possible, such as vertical wells, combination horizontal and vertical collection systems, or horizontal trenches only, leachate collection components, and passive systems.
NR 440.75(3)(b)2.b.b. Install a collection and control system that captures the gas generated within the landfill within 30 months after the first annual report in which the emission rate equals or exceeds 50 megagrams per year, unless Tier 2 or Tier 3 sampling demonstrates that the emission rate is less than 50 megagrams per year, as specified in sub. (8) (c) 1. or 2. 1) An active collection system shall:
a) Be designed to handle the maximum expected gas flow rate from the entire area of the landfill that warrants control over the intended use period of the gas control or treatment system equipment.
b) Collect gas from each area, cell or group of cells in the landfill in which the initial solid waste has been placed for a period of 5 years or more if active, or 2 years or more if closed or at final grade.
c) Collect gas at a sufficient extraction rate.
d) Be designed to minimize off-site migration of subsurface gas.
2) A passive collection system shall:
a) Comply with the provisions specified in subd. 2. b. 1) a), b) and d).
b) Be installed with liners on the bottom and all sides in all areas in which gas is to be collected. The liners shall be installed as required under 40 CFR 258.40. NR 440.75(3)(b)2.c.c. Route all the collected gas to a control system that complies with one of the following: 1) An open flare designed and operated in accordance with s. NR 440.18. 2) A control system designed and operated to reduce NMOC by 98% by weight, or, when an enclosed combustion device is used for control, to either reduce NMOC by 98% by weight or reduce the outlet NMOC concentration to less than 20 parts per million by volume, dry basis as hexane at 3% oxygen. The reduction efficiency or parts per million by volume shall be established by an initial performance test to be completed no later than 180 days after the initial startup of the approved control system using the test methods specified in sub. (5) (d).
a) If a boiler or process heater is used as the control device, the landfill gas stream shall be introduced into the flame zone.
b) The control device shall be operated within the parameter ranges established during the initial or most recent performance test. The operating parameters to be monitored are specified in sub. (7).
3) A treatment system that processes the collected gas for subsequent sale or use. All emissions from any atmospheric vent from the gas treatment system shall be subject to the requirements of subd. 2. c. 1) or 2).
NR 440.75(3)(b)2.d.d. Operate the collection and control device installed to comply with this section in accordance with the provisions of subs. (4), (6) and (7). NR 440.75(3)(b)3.3. The collection and control system may be capped or removed provided that all of the following conditions are met: NR 440.75(3)(b)3.a.a. The landfill shall be a closed landfill. A closure report shall be submitted to the department as provided in sub. (8) (d). NR 440.75(3)(b)3.b.b. The collection and control system shall have been in operation a minimum of 15 years. NR 440.75(3)(b)3.c.c. Following the procedures specified in sub. (5) (b), the calculated NMOC gas produced by the landfill shall be less than 50 megagrams per year on 3 successive test dates. The test dates shall be no less than 90 days apart, and no more than 180 days apart. NR 440.75(3)(c)(c) For purposes of obtaining an operating permit under Title V of the Act (42 USC 7661 to 7661f), the owner or operator of a MSW landfill subject to this section with a design capacity less than 2.5 million megagrams or 2.5 million cubic meters is not subject to the requirement to obtain an operating permit for the landfill under ch. NR 407, unless the landfill is otherwise subject to ch. NR 407. For purposes of submitting a timely application for an operating permit under ch. NR 407, the owner or operator of a MSW landfill subject to this section with a design capacity greater than or equal to 2.5 million megagrams and 2.5 million cubic meters, and not otherwise subject to ch. NR 407, becomes subject to the requirements of s. NR 407.04 (1), regardless of when the design capacity report is actually submitted, no later than the following: NR 440.75(3)(c)1.1. June 10, 1996 for MSW landfills that commenced construction, modification, or reconstruction on or after May 30, 1991 but before March 12, 1996. NR 440.75(3)(c)2.2. Ninety days after the date of commenced construction, modification or reconstruction for MSW landfills that commence construction, modification or reconstruction on or after March 12, 1996. NR 440.75(3)(d)(d) When a MSW landfill subject to this section is closed, the owner or operator is no longer subject to the requirement to maintain an operating permit under ch. NR 407 for the landfill if the landfill is not otherwise subject to the requirements of ch. NR 407 and if either of the following conditions are met: NR 440.75(4)(4) Operational standards for collection and control systems. NR 440.75(4)(a)(a) Each owner or operator of an MSW landfill with a gas collection and control system used to comply with the provisions of sub. (3) (b) 2. b. shall: NR 440.75(4)(a)1.1. Operate the collection system such that gas is collected from each area, cell or group of cells in the MSW landfill in which solid waste has been in place for: NR 440.75(4)(a)2.2. Operate the collection system with negative pressure at each wellhead except under the following conditions: NR 440.75(4)(a)2.a.a. A fire or increased well temperature. The owner or operator shall record instances when positive pressure occurs in efforts to avoid a fire. These records shall be submitted with the annual reports as provided in sub. (8) (f) 1. NR 440.75(4)(a)2.b.b. Use of a geomembrane or synthetic cover. The owner or operator shall develop acceptable pressure limits in the design plan. NR 440.75(4)(a)2.c.c. A decommissioned well. A well may experience a static positive pressure after shut down to accommodate for declining flows. All design changes shall be approved by the department. NR 440.75(4)(a)3.3. Operate each interior wellhead in the collection system with a landfill gas temperature less than 55°C and with either a nitrogen level less than 20% or an oxygen level less than 5%. The owner or operator may establish a higher operating temperature, nitrogen or oxygen value at a particular well. A higher operating value demonstration shall show supporting data that the elevated parameter does not cause fires or significantly inhibit anaerobic decomposition by killing methanogens. Nitrogen and oxygen level shall be determined as follows: 1) The span shall be set so that the regulatory limit is between 20 and 50% of the span.
2) A data recorder is not required.
3) Only 2 calibration gases are required, a zero and span, and ambient air may be used as the span.
4) A calibration error check is not required.
5) The allowable sample bias, zero drift and calibration drift are ± 10%.
NR 440.75(4)(a)4.4. Operate the collection system so that the methane concentration is less than 500 parts per million above background at the surface of the landfill. To determine if this level is exceeded, the owner or operator shall conduct surface testing around the perimeter of the collection area and along a pattern that traverses the landfill at 30 meter intervals and where visual observations indicate elevated concentrations of landfill gas, such as distressed vegetation and cracks or seeps in the cover. The owner or operator may establish an alternative traversing pattern that ensures equivalent coverage. A surface monitoring design plan shall be developed that includes a topographical map with the monitoring route and the rationale for any site-specific deviations from the 30 meter intervals. Areas with steep slopes or other dangerous areas may be excluded from the surface testing. NR 440.75(4)(a)5.5. Operate the system such that all collected gases are vented to a control system designed and operated in compliance with sub. (3) (b) 2. c. In the event the collection or control system is inoperable, the gas mover system shall be shut down and all valves in the collection and control system contributing to venting of the gas to the atmosphere shall be closed within one hour. NR 440.75(4)(a)6.6. Operate the control or treatment system at all times when the collected gas is routed to the system. NR 440.75(4)(b)(b) If monitoring demonstrates that the operational requirements in par. (a) 2., 3. or 4. are not met, corrective action shall be taken as specified in sub. (6) (a) 3. to 5. or (c). If the specified corrective actions are taken, the monitored exceedance is not a violation of the operational requirements in this subsection. NR 440.75(5)(a)1.1. ‘Emission rate calculation.’ The landfill owner or operator shall calculate the NMOC emission rate using either of the equations provided in subd. 1. a. or b. as appropriate. Both equations may be used if the actual year-to-year solid waste acceptance rate is known for part of the life of the landfill and the actual year-to-year solid waste acceptance rate is unknown for part of the life of the landfill. The values used in both equations shall be 0.05 per year for k, 170 cubic meters per megagram for Lo and 4,000 parts per million by volume as hexane for CNMOC. For landfills located in geographical areas with a 30 year annual average precipitation of less than 25 inches, as measured at the nearest representative official meteorologic site, the k value used shall be 0.02 per year. NR 440.75(5)(a)1.a.a. The following equation shall be used if the actual year-to-year solid waste acceptance rate is known: where:
MNMOC is the total NMOC emission rate from the landfill in megagrams per year
k is the methane generation rate constant in year-1
Lo is the methane generation potential in cubic meters per megagram of solid waste
Mi is the mass of solid waste in the ith section in megagrams. The mass of nondegradable solid waste may be subtracted from the total mass of solid waste in a particular section of the landfill when calculating the value for Mi if documentation of the nature and amount of such wastes is maintained.
ti is the age of the ith section in years
CNMOC is the concentration of NMOC in parts per million by volume as hexane
3.6 x 10-9 is a conversion factor
NR 440.75(5)(a)1.b.b. The following equation shall be used if the actual year-to-year solid waste acceptance rate is unknown: where:
MNMOC is the mass emission rate of NMOC in megagrams per year
Lo is the methane generation potential in cubic meters per megagram of solid waste
R is the average annual acceptance rate in megagrams per year. The mass of nondegradable solid waste may be subtracted from the total mass of solid waste in a particular section of the landfill when calculating the value or R, if documentation of the nature and amount of such wastes is maintained.
k is the methane generation rate constant in year-1
t is the age of landfill in years
CNMOC is the concentration of NMOC in parts per million by volume as hexane
