Chapter NR 666

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where:

n means the number of stacks.

Actual Quantity Burned means the waste quantity burned per month in device “i”.

Allowable Quantity Burned means the maximum allowable exempt quantity for stack “i” from the table in sub. (1) (a).

NR 666.108 Note Note: Hazardous wastes that are subject to the special requirements for small quantity generators under ss. NR 662.013 and 662.016 may be burned in an off-site device under the exemption provided by this section, but shall be included in the quantity determination for the exemption.

NR 666.108(4) (4) Notification requirements. The owner or operator of facilities qualifying for the small quantity burner exemption under this section shall provide a one-time signed, written notice to the department indicating all of the following:

NR 666.108(4)(a) (a) The combustion unit is operating as a small quantity burner of hazardous waste.

NR 666.108(4)(b) (b) The owner and operator are in compliance with this section.

NR 666.108(4)(c) (c) The maximum quantity of hazardous waste that the facility may burn per month as provided by sub. (1) (a).

NR 666.108(5) (5) Recordkeeping requirements. The owner or operator shall maintain at the facility for at least 3 years sufficient records documenting compliance with the hazardous waste quantity, firing rate and heating value limits of this section. At a minimum, these records shall indicate the quantity of hazardous waste and other fuel burned in each unit per calendar month, and the heating value of the hazardous waste.

NR 666.108 History History: CR 05-032: cr. Register July 2006 No. 607, eff. 8-1-06.

NR 666.109 NR 666.109 Low risk waste exemption.

NR 666.109(1) (1) Waiver of DRE standard. The DRE standard of s. NR 666.104 (1) does not apply if the boiler or industrial furnace is operated in conformance with par. (a) and the owner or operator demonstrates by procedures prescribed in par. (b) that the burning will not result in unacceptable adverse health effects.

NR 666.109(1)(a) (a) The device shall be operated with all of the following conditions:

NR 666.109(1)(a)1. 1. A minimum of 50% of fuel fired to the device shall be fossil fuel, fuels derived from fossil fuel, tall oil, or, if approved by the department on a case-by-case basis, other nonhazardous fuel with combustion characteristics comparable to fossil fuel. Such fuels are termed primary fuel for purposes of this section. (Tall oil is a fuel derived from vegetable and rosin fatty acids.) The 50% primary fuel firing rate shall be determined on a total heat or mass input basis, whichever results in the greater mass feed rate of primary fuel fired.

NR 666.109(1)(a)2. 2. Primary fuels and hazardous waste fuels shall have a minimum as-fired heating value of 8,000 Btu/lb.

NR 666.109(1)(a)3. 3. The hazardous waste shall be fired directly into the primary fuel flame zone of the combustion chamber.

NR 666.109(1)(a)4. 4. The device shall operate in conformance with the carbon monoxide controls provided by s. NR 666.104 (2) (a). Devices subject to the exemption provided by this section are not eligible for the alternative carbon monoxide controls provided by s. NR 666.104 (3).

NR 666.109(1)(b) (b) Procedures to demonstrate that the hazardous waste burning will not pose unacceptable adverse public health effects are all of the following:

NR 666.109(1)(b)1. 1. Identify and quantify those nonmetal compounds listed in ch. NR 661 Appendix VIII that could reasonably be expected to be present in the hazardous waste. The constituents excluded from analysis shall be identified and the basis for their exclusion explained.

NR 666.109(1)(b)2. 2. Calculate reasonable, worst case emission rates for each constituent identified in subd. 1. by assuming the device achieves 99.9% destruction and removal efficiency. That is, assume that 0.1% of the mass weight of each constituent fed to the device is emitted.

NR 666.109(1)(b)3. 3. For each constituent identified in subd. 1., use emissions dispersion modeling to predict the maximum annual average ground level concentration of the constituent.

NR 666.109(1)(b)3.a. a. Dispersion modeling shall be conducted using methods specified in s. NR 666.106 (8).

NR 666.109(1)(b)3.b. b. Owners and operators of facilities with more than one on-site stack from a boiler or industrial furnace that is exempt under this section shall conduct dispersion modeling of emissions from all stacks exempt under this section to predict ambient levels prescribed by this subdivision.

NR 666.109(1)(b)4. 4. Ground level concentrations of constituents predicted under subd. 3. may not exceed all of the following levels:

NR 666.109(1)(b)4.a. a. For the noncarcinogenic compounds listed in ch. NR 666 Appendix IV, the levels established in ch. NR 666 Appendix IV.

NR 666.109(1)(b)4.b. b. For the carcinogenic compounds listed in ch. NR 666 Appendix V, the sum for all constituents of the ratios of the actual ground level concentration to the level established in ch. NR 666 Appendix V cannot exceed 1.0.

NR 666.109(1)(b)4.c. c. For constituents not listed in ch. NR 666 Appendix IV or V, 0.1 micrograms per cubic meter.

NR 666.109(2) (2) Waiver of particular matter standard. The particulate matter standard of s. NR 666.105 does not apply if both of the following conditions are met:

NR 666.109(2)(a) (a) The DRE standard is waived under sub. (1).

NR 666.109(2)(b) (b) The owner or operator complies with the Tier I or adjusted Tier I metals feed rate screening limits provided by s. NR 666.106 (2) or (5).

NR 666.109 History History: CR 05-032: cr. Register July 2006 No. 607, eff. 8-1-06; corrections in (1) (b) 4. a. to c. made under s. 13.92 (4) (b) 7., Stats., Register March 2013 No. 687.

NR 666.110 NR 666.110 Waiver of DRE trial burn for boilers. Boilers that operate under the special requirements of this section, and that do not burn hazardous waste containing (or derived from) EPA hazardous waste numbers F020, F021, F022, F023, F026 or F027, are considered to be in conformance with the DRE standard of s. NR 666.104 (1), and a trial burn to demonstrate DRE is waived. When burning hazardous waste, all of the following apply:

NR 666.110(1) (1) A minimum of 50% of fuel fired to the device shall be fossil fuel, fuels derived from fossil fuel, tall oil, or, if approved by the department on a case-by-case basis, other nonhazardous fuel with combustion characteristics comparable to fossil fuel. Such fuels are termed primary fuel for purposes of this section. (Tall oil is a fuel derived from vegetable and rosin fatty acids.) The 50% primary fuel firing rate shall be determined on a total heat or mass input basis, whichever results in the greater mass feed rate of primary fuel fired.

NR 666.110(2) (2) Boiler load may not be less than 40%. Boiler load is the ratio at any time of the total heat input to the maximum design heat input.

NR 666.110(3) (3) Primary fuels and hazardous waste fuels shall have a minimum as-fired heating value of 8,000 Btu/lb, and each material fired in a burner where hazardous waste is fired shall have a heating value of at least 8,000 Btu/lb, as-fired.

NR 666.110(4) (4) The device shall operate in conformance with the carbon monoxide standard provided by s. NR 666.104 (2) (a). Boilers subject to the waiver of the DRE trial burn provided by this section are not eligible for the alternative carbon monoxide standard provided by s. NR 666.104 (3).

NR 666.110(5) (5) The boiler shall be a watertube type boiler that does not feed fuel using a stoker or stoker type mechanism.

NR 666.110(6) (6) The hazardous waste shall be fired directly into the primary fuel flame zone of the combustion chamber with an air or steam atomization firing system, mechanical atomization system, or a rotary cup atomization system under any of the following conditions:

NR 666.110(6)(a) (a) Viscosity. The viscosity of the hazardous waste fuel as-fired may not exceed 300 SSU.

NR 666.110(6)(b) (b) Particle size. When a high pressure air or steam atomizer, low pressure atomizer or mechanical atomizer is used, 70% of the hazardous waste fuel shall pass through a 200 mesh (74 micron) screen, and when a rotary cup atomizer is used, 70% of the hazardous waste shall pass through a 100 mesh (150 micron) screen.

NR 666.110(6)(c) (c) Mechanical atomization systems. Fuel pressure within a mechanical atomization system and fuel flow rate shall be maintained within the design range taking into account the viscosity and volatility of the fuel.

NR 666.110(6)(d) (d) Rotary cup atomization systems. Fuel flow rate through a rotary cup atomization system shall be maintained within the design range taking into account the viscosity and volatility of the fuel.

NR 666.110 History History: CR 05-032: cr. Register July 2006 No. 607, eff. 8-1-06.

NR 666.111 NR 666.111 Standards for direct transfer.

NR 666.111(1) (1) Applicability. The regulations in this section apply to owners and operators of boilers and industrial furnaces subject to s. NR 666.102 or 666.103 if hazardous waste is directly transferred from a transport vehicle to a boiler or industrial furnace without the use of a storage unit.

NR 666.111(2) (2) Definitions.

NR 666.111(2)(a) (a) When used in this section, the following terms have the meanings given in subds. 1. and 2.:

NR 666.111(2)(a)1. 1. “Direct transfer equipment” means any device (including but not limited to, such devices as piping, fittings, flanges, valves and pumps) that is used to distribute, meter or control the flow of hazardous waste between a container (i.e., transport vehicle) and a boiler or industrial furnace.

NR 666.111(2)(a)2. 2. “Container” means any portable device in which hazardous waste is transported, stored, treated or otherwise handled, and includes transport vehicles that are containers themselves (e.g., tank trucks, tanker-trailers and rail tank cars), and containers placed on or in a transport vehicle.

NR 666.111(2)(b) (b) This section references several requirements provided in subchs. I and J of chs. NR 664 and 665. For purposes of this section, the term tank systems in those referenced requirements means direct transfer equipment as defined in par. (a).

NR 666.111(3) (3) General operating requirements.

NR 666.111(3)(a) (a) No direct transfer of a pumpable hazardous waste shall be conducted from an open-top container to a boiler or industrial furnace.

NR 666.111(3)(b) (b) Direct transfer equipment used for pumpable hazardous waste shall always be closed, except when necessary to add or remove the waste, and may not be opened, handled or stored in a manner that may cause any rupture or leak.

NR 666.111(3)(c) (c) The direct transfer of hazardous waste to a boiler or industrial furnace shall be conducted so that it does not do any of the following:

NR 666.111(3)(c)1. 1. Generate extreme heat or pressure, fire, explosion or violent reaction.

NR 666.111(3)(c)2. 2. Produce uncontrolled toxic mists, fumes, dusts or gases in sufficient quantities to threaten human health.

NR 666.111(3)(c)3. 3. Produce uncontrolled flammable fumes or gases in sufficient quantities to pose a risk of fire or explosions.

NR 666.111(3)(c)4. 4. Damage the structural integrity of the container or direct transfer equipment containing the waste.

NR 666.111(3)(c)5. 5. Adversely affect the capability of the boiler or industrial furnace to meet the standards provided by ss. NR 666.104 to 666.107.

NR 666.111(3)(c)6. 6. Threaten human health or the environment.

NR 666.111(3)(d) (d) Hazardous waste may not be placed in direct transfer equipment, if it could cause the equipment or its secondary containment system to rupture, leak, corrode or otherwise fail.

NR 666.111(3)(e) (e) The owner or operator of the facility shall use appropriate controls and practices to prevent spills and overflows from the direct transfer equipment or its secondary containment systems. These include, at a minimum, all of the following:

NR 666.111(3)(e)1. 1. Spill prevention controls (e.g., check valves, dry discount couplings).

NR 666.111(3)(e)2. 2. Automatic waste feed cutoff to use if a leak or spill occurs from the direct transfer equipment.

NR 666.111(4) (4) Areas where direct transfer vehicles (containers) are located. Applying the definition of container under this section, owners and operators shall comply with all of the following requirements:

NR 666.111(4)(a) (a) The containment requirements of s. NR 664.0175.

NR 666.111(4)(b) (b) The use and management requirements of subch. I of ch. NR 665, except for ss. NR 665.0170 and 665.0174, and except that in lieu of the special requirements of s. NR 665.0176 for ignitable or reactive waste, the owner or operator may comply with the requirements for the maintenance of protective distances between the waste management area and any public ways, streets, alleys, or an adjacent property line that can be built upon as required in Tables 2-1 to 2-6 of the National Fire Protection Association’s (NFPA) “Flammable and Combustible Liquids Code,” (1977 or 1981), incorporated by reference in s. NR 660.11. The owner or operator shall obtain and keep on file at the facility a written certification by the local fire marshal that the installation meets the subject NFPA codes.

NR 666.111(4)(c) (c) The closure requirements of s. NR 664.0178.

NR 666.111(5) (5) Direct transfer equipment. Direct transfer equipment shall meet all of the following requirements:

NR 666.111(5)(a) (a) Secondary containment. Owners and operators shall comply with the secondary containment requirements of s. NR 665.0193, except for s. NR 665.0193 (1), (4), (5) and (9) as follows:

NR 666.111(5)(a)1. 1. For all new direct transfer equipment, prior to their being put into service.

NR 666.111(5)(a)2. 2. For existing direct transfer equipment within 2 years after August 21, 1991.

NR 666.111(5)(b) (b) Requirements prior to meeting secondary containment requirements.

NR 666.111(5)(b)1. 1. For existing direct transfer equipment that does not have secondary containment, the owner or operator shall determine whether the equipment is leaking or is unfit for use. The owner or operator shall obtain and keep on file at the facility a written assessment reviewed and certified by a qualified, registered professional engineer in accordance with s. NR 670.011 that attests to the equipment’s integrity by August 21, 1992.

NR 666.111(5)(b)2. 2. The assessment under subd. 1. shall determine whether the direct transfer equipment is adequately designed and has sufficient structural strength and compatibility with the wastes to be transferred to ensure that it will not collapse, rupture or fail. At a minimum, this assessment shall consider all of the following:

NR 666.111(5)(b)2.a. a. Design standards, if available, according to which the direct transfer equipment was constructed.

NR 666.111(5)(b)2.b. b. Hazardous characteristics of the wastes that have been or will be handled.

NR 666.111(5)(b)2.c. c. Existing corrosion protection measures.

NR 666.111(5)(b)2.d. d. Documented age of the equipment, if available (otherwise, an estimate of the age).

NR 666.111(5)(b)2.e. e. Results of a leak test or other integrity examination such that the effects of temperature variations, vapor pockets, cracks, leaks, corrosion and erosion are accounted for.

NR 666.111(5)(b)3. 3. If, as a result of the assessment specified above, the direct transfer equipment is found to be leaking or unfit for use, the owner or operator shall comply with s. NR 665.0196 (1) and (2).

NR 666.111(5)(c) (c) Inspections and recordkeeping.

NR 666.111(5)(c)1. 1. The owner or operator shall inspect at least once each operating hour when hazardous waste is being transferred from the transport vehicle (container) to the boiler or industrial furnace all of the following:

NR 666.111(5)(c)1.a. a. Overfill or spill control equipment (e.g., waste-feed cutoff systems, bypass systems and drainage systems) to ensure that it is in good working order.

NR 666.111(5)(c)1.b. b. The above ground portions of the direct transfer equipment to detect corrosion, erosion or releases of waste (e.g., wet spots, dead vegetation).

NR 666.111(5)(c)1.c. c. Data gathered from monitoring equipment and leak-detection equipment, (e.g., pressure and temperature gauges) to ensure that the direct transfer equipment is being operated according to its design.

NR 666.111(5)(c)2. 2. The owner or operator shall inspect cathodic protection systems, if used, to ensure that they are functioning properly according to the schedule provided by s. NR 665.0195 (2).