2010-81 Adopted effective I 0-31-10 

CHAPTER Env-A 1300 NITROGEN OXIDES (NOx) REASONABLY AVAILABLE CONTROL 

TECHNOLOGY (RACT) 

Statutory Authority: RSA 125-C:4 

PART Env-A 1301 PURPOSE AND APPLICABILITY 

Env-A 1301.01 Purpose. The purpose of this chapter is to establish reasonably available control 

technology (RACT) standards for certain NOx-emitting sources located in New Hampshire, to comply with 

sections 172(c)( I) and 182(b)(2) of the Act. 

Env-A 1301.02 Applicability. 

(a) The requirements in Env-A 1300, as effective on October 31, 2010, shall not relieve any source 

that was subject to any version of Env-A 1211 in effect from May 20, 1994 through October 30, 2010 from 

its obligation to have been in compliance with applicable rules then in effect. 

(b) Utility boiler(s) shaH be subject to the requirements of Env-A 1303 if the combined maximum 

heat input rate of such boiler(s) exceeds 50 million Btu per hour at any time after December 31, 1989 and 

the permitting applicability levels specified in Env-A 607.01 are met. 

(c) Steam electric boiler(s) shall be subject to the requirements of Env-A 1304 if the combined 

maximum heat input rate of such boiler(s) exceeds 50 million Btu per hour at any time after December 31, 

1989 and the permitting applicability levels specified in Env-A 607.01 are met. 

(d) Industrial boiler(s) shall be subject to the requirements of Env-A 1305 if the combined maximum 

heat input rate of such boiler(s) exceeds 50 million Btu per hour at any time after December 31, 1989 and the 

permitting applicability levels specified in Env-A 607.01 are met. 

(e) Stationary combustion turbine(s), except for combustion turbines mounted on aircraft and 

combustion turbines used as load shaving units or emergency generators, sha11 be subject to the requirements 

of Env-A 1306 if the combined maximum heat input rate of such turbine(s) exceeds 25 million Btu per hour at 

any time after December 31, 1989 and the permitting applicability levels specified in Env-A 607.01 are met. 

(f) Stationary internal combustion engine(s), except for stationary internal combustion engines used 

as load shaving units or emergency generators, shall be subject to the requirements of Env-A 1307 if the 

combined maximum heat input rate of such engine(s) exceeds 4.5 million Btu per hour at any time after 

December 31, 1989 and the permitting applicability levels specified in Env-A 607.01 are met. 

(g) Asphalt plant rotary dryer(s) shaH be subject to the requirements of Env-A 1308 if the combined 

maximum heat input rate of such dryer(s) exceeds 26.2 million Btu per hour at any time after December 31, 

1989. 

(h) Incinerator(s), except for incinerators combusting sewage sludge, sha11 be subject to the 

requirements of Env-A 1309 if the combined processing capacity of such incinerator(s) exceeds 85 tons per 

day or more of waste at any time after December 31 , 1989. 

(i) Wallboard dryer(s), calcining mill(s), calciner(s), and gypsum rock dryer(s) sha11 be subject to 

the requirements of Env-A 1310 if the combined theoretical potential emissions of such wallboard dryer(s), 

calcining mill(s), calciner(s), and gypsum rock dryer(s) equal or exceed 50 tons per calendar year of NOx at 

any time after December 31, 1989. 

(j) If the combined theoretical potential emissions from all devices and processes located at a 

stationary source exceed 50 tons per calendar year of NOx at any time after December 31, 1989, all 

stationary internal combustion engines or combustion turbines used as emergency generators at that source 

which meet the permitting applicability levels specified in Env-A 607.0 I shall be subject to the 

requirements of Env-A 1311 unless: 
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(I) All such emergency generators are limited to less than 500 hours of operation during any 

consecutive 12-month period; and 

(2) The combined theoretical potential emissions of NOx from all such generators are limited 

to less than 25 tons for any consecutive 12-month period by permit conditions. 

(k) Auxiliary boiler(s) shall be subject to the requirements of Env-A 1312 if the combined 

theoretical potential emissions from all devices and processes located at the stationary source exceed 50 

tons per calendar year of NOx at any time after December 31, 1989. 

(I) Load shaving unit(s) shall be subject to the requirements of Env-A 1313 if the combined 

theoretical potential emissions from all devices and processes located at the stationary source exceed 50 

tons per calendar year of NOx at any time after December 31, 1989. 

(m) Any miscellaneous stationary source at a stationary source having combined theoretical potential 

emissions from all devices and processes which equal or exceed 50 tons per calendar year of NOx at any 

time after December 31, 1989 shall be subject to the requirements of Env-A 1314, except for NOx-emitting 

devices that have implemented Best Available Control Technology (BACT) for NOx, or Lowest 

Achievable Emission Rate (LAER) for NOx at any time after December 31, 1989 pursuant to a federally 

enforceable permit. Any device or group of devices at a stationary source which meet the applicability 

criteria of (b) through (1), above, shall be subject to the requirements of the applicable parts. 

(n) Any stationary source having combined theoretical potential emissions of 50 tons or more of 

NOx during any consecutive 12-month period but whose actual NOx emissions have not equaled or 

exceeded 50 tons during any consecutive 12-month period since January 1, 1989, shall be subject to the 

requirements of this chapter, unless the following requirements are met: 

(1) The combined actual NOx emissions from NOx emitting devices or processes are limited 

to Jess than 50 tons during any consecutive 12-month period by an enforceable permit or consent 

decree; and 

(2) The source has been and remains in full compliance with the conditions of a permit issued 

by the department or by EPA, or the terms of any consent decree entered into by the department 

or by EPA, or any court order. 

(o) Once a stationary source becomes subject to the requirements of this chapter, the source shall 

remain subject to these requirements even if emissions subsequently fall below the applicability levels 

specified in (b) through (m), above. 

(p) If a stationary source fai Is to comply with any of the terms or conditions of a permit or consent 

decree, or court order referred to in (n), above, the source shall immediately become subject to the 

applicable requirements of this chapter. 

PART Env-A 1302 DEFINITIONS 

Env-A 1302.01 "Actual mole ratio" means the measured number of moles of one chemical divided by 

the measured number of moles of a second chemical in the same chemical system. 

Env-A 1302.02 "Add-on control" means a device or process used to collect, remove, convert or destroy 

gaseous NOx pollutants resulting from the combustion of fuel or waste before these pollutants are released 

into the ambient air. 

Env-A 1302.03 "Asphalt" means a dark-brown to black cementitious material that is solid, semi-solid 

or liquid in consistency, in which the primary constituents are bitumens which occur in nature as such or 

are obtained as residue in refining petroleum. 
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Env-A 1302.04 "Auxiliary boiler" means a boiler operated to provide steam and house heat only 

when the primary steam or power source for a facility is not available for usc. Auxiliary boiler shall not 

include emergency generators and load shaving units. 

Env-A 1302.05 "Auxiliary fuel" means fuel, other than waste materials, used in an incinerator or resource 

recovery facility to attain temperatures sufficiently high enough to dry and ignite waste materials, to maintain 

ignition, or to drive the complete combustion of combustible solids, vapors and/or gaseous substances. 

Env-A 1302.06 "Classifiable process or device" means any process or device that emits NOx and is 

included in one of the categories listed in Env-A 1301.02(b) through (l), but is not subject to the requirements 

of Env-A 1303 through Env-A 13 J 3 because such process or device falls below the applicability threshold. 

Env-A 1302.07 "Coal" means all solid fuels classified as anthracite, bituminous, lignite, or 

subbituminous according to the ASTM Standard Classification of Coals by Rank, ASTM D 388-99, coal 

refuse, and petroleum coke. The term includes coal-derived synthetic fuels, including but not limited to, 

solvent refined coal, gasified coal, coal-oil mixtures, and coal-water mixtures. 

Env-A 1302.08 "Cogeneration facility" means a facility that generates steam for the purpose of supplying 

heat or energy to a manufacturing process in the host facility, and power for sale to an electric utility. 

Env-A 1302.09 "Coke" means a fused, cellular, porous structure that remains after free moisture and 

the major pot1ion of the volatile materials have been distilled from bituminous coal and other carbonaceous 

material by the application of heat in the absence of air or in the presence of a limited supply of air. 

Env-A 1302.10 "Combined cycle combustion turbine" means any stationary gas or oil-fired turbine 

which recovers heat from the turbine exhaust gases to heat water or generate steam. 

Env-A 1302.11 "Commercial fuel" means solid, liquid, or gaseous fuel normally produced or 

manufactured, and sold for the purpose of creating useful heat or mechanical energy. 

Env-A 1302.12 "Cyclone firing" means a fuel-firing process using one or more horizontal cylinders 

to burn fuel under conditions of high rates of heat release, low rates of heat absorption by the cylinder 

walls, with centrifugal action imparted to the fuel particles by air entering the cylinder. The combustion 

gases exiting from the cylinders turn 90 degrees to go up through the boiler. The horizontal cylinders are 

attached to the bottom of the furnace with one or more of the cylinders arranged on one furnace wall or on 

2 opposed furnace walls. 

Env-A 1302.13 "Dry bottom" means the boiler has a furnace bottom temperature below the ash 

melting point, and the bottom ash is removed as a solid. 

Env-A 1302.14 "Electric generating utility" means a utility which is regulated by the public utilities 

commission and which generates electricity for sale. 

Env-A 1302.15 "Emergency generator" means "emergency generator" as defined in Env-A 101. 

Env-A 1302. I 6 "Emissions unit" means "emissions unit" as defined in Env-A 10 I. 

Env-A 1302.17 "Face firing" means a furnace firing design in which the burners are mounted in an 

array on one or more vertical walls, including: 

(a) Opposed firing, where the burners are mounted on 2 opposite walls; and 

(b) Single-wall firing, where the burners are mounted on only one wall. 

Env-A 1302.18 "Fuel-bound nitrogen" means the nitrogen content, in weight fraction, of the fuel. 

Env-A 1302.19 "Gas or gaseous fuel" means natural gas, liquid petroleum gas, or gaseous substances 

produced synthetically from coal or oil, or derived from the decomposition of organic matter, or derived as 
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a by-product of a manufacturing process, and which can be used to create useful heat and/or mechanical 

energy. 

Env-A 1302.20 "Industrial boiler" means a steam generating unit that generates steam to supply 

power and/or heat to an industrial, institutional or commercial operation, excluding boilers used by electric 

utilities, small power producers and cogenerators to generate electricity. 

Env-A 1302.21 "Internal combustion engine" means any engine in which power, produced by heat 

and/or pressure developed in the engine cylinder(s) by burning a mixture of air and fuel, is subsequently 

converted to mechanical work by means of one or more pistons. 

Env-A 1302.22 "Lean burn engine" means a stationary internal combustion engine in which the 

amount of 0 2 in the engine exhaust gases is 1.0% or more, by weight, unless otherwise specified by the 

engine manufacturer. 

Env-A 1302.23 "Limited at all times" means that the NOx emissions of a source or device does not 

exceed the prescribed NOx emission limit over the averaging time specified in the applicable section of this 

part during the entire period of time that the source or device operates. 

Env-A 1302.24 "Liquid petroleum gas" means a flammable mixture of hydrocarbon gases derived 

from petroleum refining or natural gas processing that meets the ASTM Standard Specification for Liquid 

Petroleum Gases, 01835-97. 

Env-A 1302.25 "Load shaving unit" means a device used to generate electricity for sale or use during 

high electric demand days, including but not limited to stationary combustion turbines or stationary internal 

combustion engines. 

Env-A 1302.26 "Low-NOx emitting process" means a process that results in NOx emission 

reductions which constitute NOx RACT as approved by the division and EPA pursuant to Env-A 1315.05. 

Env-A 1302.27 "Manufacturing process" means any process directly related to the manufacturing of 

goods and/or supplies, both finished and intermediate, whose operations result in pollutant emissions to the 

ambient air from process or manufacturing equipment or machinery directly or through exhaust or 

ventilating systems, including elevated stacks. 

Env-A 1302.28 "Maximum allowable emission rate" means the maximum amount of an air 

contaminant which is allowed to be emitted into the ambient air during a prescribed interval of time. 

Env-A 1302.29 "Maximum heat input rate" means the maximum steady state fuel firing rate, in Btus 

per hour of gross heat input, of fuel burning equipment as determined in the design rating ofthe equipment 

manufacturer and the characteristics of the fuel-burning devices. 

Env-A 1302.30 "Miscellaneous stationary source" means that portion of a stationary source, as 

defined in Env-A 101.185, consisting of devices and processes that are: 

(a) Unclassifiable; or 

(b) Classifiable. 

Env-A 1302.3 I "Mole" means the specific amount of chemical substance in a system proportional to 

its number of molecules, calculated as the mass of the chemical divided by its molecular weight. 

Env-A 1302.32 "Natural gas" means a naturally occurring mixture of hydrocarbon and 

nonhydrocarbon gases found in geologic formations beneath the earth's surface, of which the principal 

constituent is methane. 
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Env-A 1302.33 "Normalized stoichiometric ratio (NSR)" means the actual mole ratio of urea to NOx 

divided by the theoretical stoichiometric ratio, which is 0.5 for the reaction between urea and NOx. 

Env-A 1302.34 "NOx control technique" means a system, design modification, or use of equipment 

and technology to reduce NOx emissions to the ambient air from NOx-emitling devices or processes, 

including combustion modifications, low-NOx burners, overfire air systems, low excess air systems, flue gas 

recirculation, natural gas reburn, burners out of service, fuel switching, selective catalytic reduction, 

selective non-catalytic reduction, or other device or procedure approved pursuant to Env-A 1316. 

Env-A 1302.35 "Oxides of nitrogen (NOx)" means all oxides of nitrogen, except nitrous oxide, as 

measured in accordance with test methods specified in Env-A 800 and approved by EPA. 

Env-A 1302.36 "Ozone season" means the period between May I and September 30, inclusive. 

Env-A 1302.37 "Power outage" means that normally available sources of electrical energy are 

unavailable due to circumstances beyond the control of the customer(s) of the power supplier(s). 

Env-A 1302.38 "RACT order" means a written order, providing for inventories and emission limits 

for NOx-emitting devices or processes and RACT-compliance procedures and schedules, issued by the 

division to a miscellaneous stationary source or a stationary source seeking alternative RACT emission 

limits pursuant to Env-A 1315.04. 

Env-A 1302.39 "Rated brake horsepower (bhp)" means the brake horsepower rating specified by the 

manufacturer and listed on the nameplate. 

Env-A 1302.40 "Regenerative cycle combustion turbine" means any stationary gas or oil-fired 

turbine which recovers heat from the turbine exhaust gases to preheat inlet combustion air to the turbine. 

Env-A 1302.41 "Repowering" means the replacement or conversion of an existing emissions unit 

with a new or converted unit which results in lower emission rates of NOx. 

Env-A 1302.42 "Rich burn engine" means any stationary internal combustion engine that is not a lean 

burn engine. 

Env-A 1302.43 "Simple cycle combustion turbine" means any stationary gas or oil-fired turbine 

which does not recover heat from the turbine exhaust gases to preheat the inlet combustion air to the 

turbine, heat water or generate steam. 

Etw-A I 302.44 "Shaker grate or vibrating grate" means a grate that mechanically oscillates or 

vibrates during loading of solid fuel to assist in the introduction of the fuel into the combustion zone, and in 

removing accumulation of fuel particle deposits on the grate surface. 

Env-A 1302.45 "Small power production facility" means a power production facility that is designed 

for or capable of operating at a capacity of Jess than 30 megawatts and is not a cogeneration facility. 

Env-A 1302.46 "Stationary combustion turbine" means any simple cycle combustion turbine, 

regenerative cycle combustion turbine, or any combustion turbine pot1ion of a combined cycle steam/ 

electric generating system that is not self-propelled, but which can be mounted on a vehicle for portability. 

Env-A 1302.47 "Stationary grate" means a grate that is permanently affixed during normal boiler 

operation. 

Env-A 1302.48 "Stationary internal combustion engine" means any internal combustion engine that 

operates as a stationary source, but which can be mounted on a vehicle for portability. 

Env-A 1302.49 "Steam electric boiler" means a steam generating unit, as defined in Env-A 1302.49, 

that is constructed and operated for the purpose of supplying more than one-third of its potential electrical 
20 I 0-81 Adopted effective I 0-31-10 6 

output to any utility power distribution system for sale which is located at a cogeneration or small power 

production facility. 

Env-A 1302.50 "Steam generating unit" means a device that combusts any fuel or byproduct/waste to 

produce steam or to heat water or any other heat transfer medium. 

Env-A 1302.51 "Stoker" means a furnace design that incorporates a feeding mechanism, fuel 

distribution and ash residue collection system for the purpose of introducing solid fuel into the combustion 

zone of the furnace by feeding the fuel onto a grate. 

Env-A 1302.52 "Tangential firing" means a boiler firing design where the burners and air nozzles are 

mounted in each corner of the furnace chamber where the vertical furnace walls meet. Both the fuel and air 

are directed from the furnace comers along a line tangential to a circle lying in a horizontal plane of the 

furnace. 

Env-A 1302.53 "Theoretical potential emissions" means the quantity of nitrogen oxides that could be 

emitted by a source, prior to the application of add-on controls, based on either of the following: 

(a) Continuous operation of 8760 hours per year at the maximum heat input rate of the source; or 

(b) Hours of operation, process conditions, or both that are limited by the conditions of a federally 

enforceable permit. 

Env-A 1302.54 "Traveling grate" means a grate designed to move at a constant velocity during the 

loading of solid fuel to assist in the introduction of fuel into the combustion zone. 

Env-A 1302.55 "Unclassifiable process or device" means any process or device that emits NOx but is 

not included in any of the categories listed in Env-A 130 J.02(b) through (1). 

Env-A 1302.56 "Utility boiler" means a steam generating unit that is constructed and operated for the 

purpose of supplying more than one-third of its potential electrical output capacity to any utility power 

distribution system for sale, except for steam electric boilers, as defined in Env-A 1302.48. 

Env-A 1302.57 "Wet bottom" means the boiler has a furnace bottom temperature above the ash 

melting point and the bottom ash is removed as a liquid. 

PART Env-A 1303 UTILITY BOILERS 

Env-A 1303.01 Applicability. All utility boilers meeting the applicability criteria of Env-A 

1301.02(b) shall be subject to this part. 

Env-A 1303.02 Timing of Efficiencv Tests; Process Adjustments. The owner or operator of one or 

more utility boiler(s) having a heat input rate of at least 5 million Btu per hour but less than 50 million Btu 

per hour per boiler shall, before April 1st of each year: 

(a) Perform an efficiency test on each boiler using the test procedures specified in chapter 3, 

Combustion Efficiency Tables, Taplin, Harry, R., Fairmont Press, 1991; and 

(b) Adjust the combustion process of each boiler in accordance with the procedures specified in 

chapter 5, Combustion Efficiency Tables, Taplin, Harry, R., Fairmont ,Press, 1991. 

Env-A 1303.03 Recordkeeping for Efficiency Tests. The owner or operator of one or more utility 

boiler(s) with a heat input rate of at least 5 million Btu per hour but less than 50 million Btu per hour per 

boiler shall maintain, in a format that can be retained unaltered for the time period specified in Env-A 902, 

the following information for each efficiency test: 

(a) The date(s) on which: 
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(1) The efficiency test was conducted; and 

(2) The combustion process was last adjusted; 

(b) The name(s), title(s), and affiliation(s) of the individual(s) who: 

(I) Conducted the efficiency test; and 

(2) Made the adjustments; 

(c) The NOx emission concentration, in pans-per-million by volume, dry basis (ppmvd), corrected 

to 15% oxygen, after the adjustments are made; 

(d) The CO emission concentration, in ppmvd, corrected to 15% oxygen, after the adjustments are 

made; 

(e) The opacity readings; and 

(t) Any other information required by Env-A 903 or Env-A 905. 

Env-A 1303.04 RACT Requirements. Each utility boiler having a heat input rate of at least 50 million 

BTU per hour shall comply with the applicable NOx RACT requirements specified in Env-A 1303.05 through 

Env-A 1303.07. 

Env-A 1303.05 RACT Requirements: Wet-Bottom Utility Boilers Firing Coal. For wet-bottom utility 

boilers firing coal, whether by itself or in combination with any other fuel(s), the NOx RACT requirements 

shall be as follows: 

(a) For tangential or face-fired boilers, an emission limit of 1.0 lb. per million Btu, based on a 24-

hour calendar day average; 

(b) For cyclone-fired boilers having a maximum net power output of less than 320 megawatts at all 

times after December 31, 1989, an emission limit of 0.92 lb. per million Btu based on a 24-hour calendar 

day average; or 

(c) For cyclone-fired boilers having a maximum net power output of more than 320 megawatts at any 

time after December 31, 1989, the emission limit specified in (d), below, coupled with one of the following: 

(I) An emission limit of 1.40 lb. per million Btu based on a 24-hour calendar day average; 

(2) The installation, operation, and maintenance of selective non-catalytic reduction (SNCR) 

technology with a minimum normalized stoichiometric ratio (NSR) of 1: 1; or 

(3) The installation, operation, and maintenance of NOx RACT air pollution control 

equipment or an air pollution control process having equivalent or greater NOx removal 

efficiency as SNCR, approved by the department and EPA; and 

(d)- Wet-bottom cyclone-fired utility boilers shall be limited at all times to the equivalent of 15.4 

tons of NOx per 24-hour calendar day. 

Env-A 1303.06 RACT Requirements: Dry-Bottom Utility Boilers Firing Coal and/or Oil. For drybottom utility boilers that fire, or that are capable of firing, coal or oil, or any combination thereof, the NOx 

RACT requirements shall be as follows: 

(a) For tangential-fired boilers, an emission limit of 0.38 lb. per million Btu, based on a 24-hour 

calendar day average; 

(b) For face-fired boilers, an emission limit of 0.50 lb. per million Btu, based on a 24-hour calendar 

clay average; and 
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(c) For stoker-fired boilers, an emission limit of 0.30 lb. per million Btu, based on a 24-hour 

calendar day average. 

Env-A 1303.07 R/\CT Requirements: Utility Boilers Firing Oil. Gas. and/or Wood. 

(a) For utility boilers that fire, or that are capable of firing, oil or gas, or any combination thereof, the 

NOx RACT requirements shall be as follows: 

(I) For tangential or face-fired boilers when firing exclusively oil, an emission limit of 0.35 lb. 

per million Btu, based on a 24-hour calendar day average; 

(2) For face-fired boilers when firing gas or any combination of oil and gas, an emission limit of 

0.25 lb. per million Btu based on a 24-hour calendar day average; and 

(3) For tangential-fired boilers when firing gas or any combination of oil and gas, an emission 

limit of 0.25 lb. per million Btu based on a 24-hour calendar day average; 

(b) For boilers that fire gas exclusively, an emission limit of 0.20 lb. per million Btu, based on an 

hourly average, for tangential or face-fired boilers; and 

(c) For boilers that fire wood fuel or that are capable of firing a combination of wood fuel and oil: 

( I) For boilers equipped with a traveling, shaker, or vibrating grate, an emission limit of 0.33 

lb. per million Btu, based on a 24-hour calendar day average; and 

(2) For boilers equipped with a stationary grate, an emission limit of 0.25 lb. per million Btu, 

based on a 24-hour calendar day average. 

(d) Utility boilers that fire any fuel or combination of fuels excluding coal shall be limited at all 

times to the equivalent of 3.8 tons of NOx per 24-hour calendar day. 

Env-A 1303.08 Retiring or Rcpowering Utility Boilers. Nothing in this chapter shall prohibit the 

retiring or repowering of a utility boiler at any time after the effective date of this chapter. Utility boilers 

shall remain subject to the applicable NOx RACf emission limits specified in this chapter, regardless of a 

decision to retire or repower the boiler. 

PART Env-A 1304 STEAM ELECTRIC BOILERS 

Env-A 1304.01 Applicability. All steam electric boilers that meet the applicability criteria of Env-A 

1301.02(c) shall be subject to this part. 

Env-A 1304.02 Timing of Efficiency Tests; Process Adjustments. The owner or operator of one or 

more steam electric boiler(s) having a heat input rate of at least 5 million Btu per hour but less than 50 

million Btu per hour per boiler shall, before April 1st of each year: 

(a) Perform an efficiency test for each boiler using the test procedures specified in chapter 3, 

Combustion Efficiency Tables, Taplin, Harry, R., Fairmont Press, 1991; and 

(b) Adjust the combustion process of each boiler in accordance with the procedures specified in 

chapter 5, Combustion Efficiency Tables, Taplin, Harry R., Fairmont Press, 1991. 

Env-A 1304.03 Recordkeeping for Efficiency Tests. The owner or operator of one or more steam 

electric boiler(s) having a heat input rate of at least 5 million Btu per hour but less than 50 million Btu per 

hour per boiler shall maintain, in a format that can be retained unaltered for the time period specified in 

Env-A 902, the following information for each efficiency test: 

(a) The date(s) on which: 
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(l) The efficiency test was conducted; and 

(2) The combustion process was last adjusted; 

(b) The name(s), title(s), and affiliation(s) of the individual(s) who: 

(I) Conducted the efficiency test; and 

(2) Made the adjustments; 

(c) The NOx emission concentration, in ppmvd, corrected to 15% oxygen, after the adjustments are 

made; 

(d) The CO emission concentration, in ppmvd, corrected to 15% oxygen, after the adjustments are 

made; 

(e) The opacity readings; and 

(f) Any other information required by Env-A 903 or Env-A 905. 

Env-A 1304.04 RACT Requirements. 

(a) Any steam electric boiler having a heat input rate of at least 50 million Btu per hour but less 

than 100 million Btu per hour shall comply with the applicable NOx RACT requirements specified in EnvA 1305.04, for the applicable fuel type and fuel-firing design. 

(b) Any steam electric boiler having a heat input rate of 100 million Btu per hour or more shall 

comply with the applicable NOx RACT requirements specified in Env-A 1305.10 for the applicable fuel 

type and fuel-firing design. 

PART Env-A 1305 INDUSTRIAL BOILERS 

Env-A 1305.01 Applicability. All industrial boilers that meet the applicability criteria of Env-A 

1301.02(d) shall be subject to this pmt. 

Env-A 1305.02 Timing of Efficiency Tests: Adjustments. The owner or operator of one or more 

industrial boiler(s) having a heat input rate of at least 5 million Btu per hour but less than 50 million Btu 

per hour per boiler shall, before April 1st of each year: 

(a) Perform an efficiency test on each boiler using the test procedures specified in chapter 3, 

Combustion Efficiency Tables, Taplin, Harry, R., Fairmont Press, 1991; and 

(b) Adjust the combustion process of each boiler in accordance with the procedures specified in 

chapter 5, Combustion Efficiency Tables, Taplin, Harry R., Fairmont Press, 1991. 

Env-A 1305.03 Recordkeeping for Efficiency Tests. The owner or operator of one or more 

industrial boiler(s) having a heat input rate of at least 5 million Btu per hour but less than 50 million Btu 

per hour per boiler shall maintain, in a format that can be retained unaltered for the time period specified in 

Env-A 902, the following information for each efficiency test: 

(a) The date(s) on which: 

(1) The efficiency test was conducted; and 

(2) The combustion process was last adjusted; 

(b) The name(s), title(s), and affiliation(s) of the individual(s) who: 

( I) Conducted the efficiency test; and 
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(2) Made the adjustments; 

(c) The NOx emission concentration, in ppmvd, corrected to 15% oxygen, after the adjustments are 

made; 

(d) The CO emission concentration, in ppmvd, corrected to 15% oxygen, after the adjustments are 

made; 

(e) The opacity readings; and 

(f) Any other information required by Env-A 903 or Env-A 905. 

Env-A 1305.04 RACT Requirements for Industrial Boilers with Heat Input Rates Less than 100 

Million Btu Per Hour. 

(a) Any industrial boiler having a heat input rate of at least 50 million Btu per hour but less than 100 

million Btu per hour shall comply with the applicable NOx RACT requirements specified in Env-A 

1305.05 through Env-A 1305.09. 

(b) For purposes of Env-A 1305.06 through Env-A 1305.08, NOx RACf control technology shall be: 

(I) The installation, operation, and maintenance of low NOx burners (LNB); or 

(2) The installation, operation, and maintenance of air pollution control equipment or an air 

pollution control process having equivalent or greater NOx removal efficiency as LNB, as 

approved by the department and EPA as specified in Env-A 13 I 6 relative to NOx RACT orders. 

Env-A 1305.05 RACT Requirements: Dry Bottom Industrial Boilers Firing Coal and/or Oil. For drybottom industrial boilers that fire, or that are capable of firing, coal or oi I, or any combination thereof, the 

NOx RACT requirements shall be as follows: 

(a) For tangential-fired boilers, an emission limit of 0.38 lb. per million Btu, based on a 24-hour 

calendar day average; 

(b) For face-fired boilers, an emission limit of 0.50 lb. per million Btu, based on a 24-hour calendar 

day average; and 

(c) For stoker-fired boilers, an emission limit of 0.30 lb. per million Btu, based on a 24-hour 

calendar day average. 

Env-A 1305.06 RACT Requirements: Boilers Firing Oil Exclusively. For tangential or face-fired 

boilers only capable of firing oil, the NOx RACT requirements shall be as follows: 

(a) For boilers firing No. 2 fuel oil exclusively, an emission limit of 0.12 lb. per million Btu, based 

on an hourly average; and 

(b) For boilers firing No. 4, 5, or 6 fuel oil, or any combination thereof: 

(I) An emission limit of 0.30 lb. per million Btu, based on a 24-hour calendar day average; or 

(2) Implement NOx RACT control technology as specified in Env-A 1305.04(b). 

Env-A 1305.07 RACT Requirements: Boilers Firing Oil and Gas. For tangential orface-fired boilers that 

fire, or that are capable of firing, a combination of oil and gas, the NOx RACT requirements shall be as follows: 

(a) When firing gas exclusively: 

(1) An emission limit of 0.10 lb. per million Btu, based on an hourly average; or 
2010-81 Adopted effective l 0-31-10 I I 

(2) Implement NOx RACT control technology as specified in Env-A l305.04(b). 

(b) When firing oil exclusively: 

(I) When firing No. 2 fuel oil exclusively, an emission limit of 0.12 lb. per million Btu, based 

on an hourly average; and 

(2) When firing No. 4, 5, or 6 fuel oil, or any combination thereof: 

a. An emission limit of 0.30 lb. per million Btu, based on a 24-hour calendar day average; or 

b. Implement NOx RACT control technology as specified in Env-A 1305.04(b). 

(c) When firing a combination of oil and gas: 

(1) When firing gas and No. 2 fuel oil, an emission limit of 0.12 lb. per million Btu, based on 

an hourly average; and 

(2) When firing gas and No.4, 5, or 6 fuel oil, or any combination thereof: 

a. An emission limit of 0.30 lb. per million Btu, based on a 24-hour calendar day average; or 

b. Implement NOx RACT control technology as specified in Env-A 1305.04(b). 

Env-A I 305.08 RACT Requirements: Boilers Firing Gas Exclusively. For boilers only capable of 

firing gas, the NOx RACT requirements shall be as follows: · 

(a) An emission limit ofO.lO lb. per million Btu, based on an hourly average; or 

(b) Implement NOx RACT control technology as specified in Env-A 1305.04(b). 

Env-A J 305.09 RACT Requirements: Boilers Firing Wood. For boilers that fire wood fuel, or that 

are capable of firing wood fuel, whether alone or in combination with oil, the NOx RACT requirements 

shall be as follows: 

(a) For boilers equipped with a traveling, shaker, or vibrating grate, an emission limit of 0.33 lb. per 

million Btu, based on a 24-hour calendar day average; and 

(b) For boilers equipped with a stationary grate, an emission limit of 0.25 lb. per million Btu based 

on a 24-hour calendar day average. 

Env-A 1305.10 RACT Requirements for Industrial Boilers with Heat Input Rates of 100 Million Btu 

Per Hour or More. 

(a) Any industrial boiler having a heat input rate of I 00 million Btu per hour or more shall comply 

with the applicable NOx RACT requirements specified in Env-A 1305.11 through Env-A 1305.15. 

(b) For purposes ofEnv-A 1305.13 through Env-A 1305.15, NOx RACT control technology shall be: 

(1) The installation, operation, and maintenance of low NOx burners (LNB); or 

(2) The installation, operation, and maintenance of air pollution control equipment or an air 

pollution control process having equivalent or greater NOx removal efficiency as LNB, as 

approved by the department and EPA as specified in Env-A 1316 relative to NOx RACT orders. 

Env-A 1305.11 RACT Requirements: Wet-Bottom Industrial Boilers Firing Coal. For wet-bottom 

boilers that fire coal or that are capable of firing coal, whether by itself or in combination with any other 

fuel(s), the NOx RACT requirements shall be as follows: 
201 0-81 Adopted effccti vc I 0-31-10 12 

(a) For tangential or face-fired boilers, an emission limit of 1.0 lb. per million Btu, based on a 24-

hour calendar day average; and 

(b) For cyclone-fired boilers, an emission limit of 0.92 lb. per million Btu, based on a 24-hour 

calendar day average; 

Env-A 1305.12 RACT Rcguirements: Dry-Bottom Industrial Boilers Firing Coal and/or Oil. For drybottom boilers that fire, or that are capable of firing, coal or oil, or any combination thereof, the NOx 

RACT requirements shall be as follows: 

(a) For tangential-fired boilers, an emission limit of 0.38 lb. per million Btu, based on a 24-hour 

calendar day average; 

(b) For face-fired boilers, an emission limit of 0.50 lb. per million Btu, based on a 24-hour calendar 

day average; and 

(c) For stoker-fired boilers, an emission limit of 0.30 lb. per million Btu, based on a 24-hour 

calendar day average; 

Env-A 1305.13 RACf Rcguircments: Industrial Boilers Firing Oil and/or Gas. For boilers that fire, 

or that are capable of firing, oil or gas, or any combination thereof, the NOx RACT requirements shall be 

as follows: 

(a) For tangential or face-fired boilers when firing oil exclusively: 

( 1) An emission limit of 0.30 lb. per million Btu, based on a 24-hour calendar day average; or 

(2) Implement NOx RACT control technology as specified in Env-A 1305.10(b); and 

(b) For tangential or face-fired boilers when firing gas, or any combination of oil and gas, an 

emission limit of 0.25 lb. per million Btu based on a 24-hour calendar day average. 

Env-A 1305.14 RACf Reguirements: Industrial Boilers Firing Gas Exclusively. For boilers that arc 

only capable of firing gas, the NOx RACT requirements shall be as follows: 

(a) For tangential or face-fired boilers, an emission limit of 0.10 lb. per million Btu, based on an 

hourly average; or 

(b) Implement NOx RACT control technology as specified in Env-A 1305.1 O(b). 

Env-A 1305.15 RACf Reguirements: Boilers Firing Wood. For boilers that fire wood fuel, or that 

are capable of firing wood fuel, whether alone or in combination with oil, the NOx RACT requirements 

shall be as follows: 

(a) For boilers equipped with a traveling, shaker, or vibrating grate, an emission limit of 0.33 lb. per 

million Btu, based on a 24-hour calendar day average; and 

(b) For boilers equipped with a stationary grate, an emission limit of0.25lb. per million Btu, based 

on a 24-hour calendar day average. 

PART Env-A 1306 COMBUSTION TURBINES 

Env-A 1306.01 Applicability. 

(a) All combustion turbines meeting the applicability criteria of Env-A 130 1.02(e) shall be subject 

to this part. 
2010-81 Adopted effective 1 0-31-l 0 13 

(b) Combustion turbines excluded from Env-A 1301.02(e) because they are used as emergency 

generators shall be subject to Env-A 1311 in lieu of this pmt if they meet the applicability criteria ofEnvA 130 1.020). 

(c) Combustion turbines excluded from Env-A 1301 .02(e) because they are used as load shaving 

units shall be subject to Env-A 1313 in lieu of this part if they meet the applicability criteria of Env-A 

130 1.02(1). 

Env-A 1306.02 Emission Standards for Combustion Turbines Constructed After May 27, 1999. A 

gas-fired turbine constructed after May 27, 1999 shall not exceed an hourly average NOx RACT emission 

limit of 25 ppmvd, corrected to 15% 0 2, equivalent to 0.092 lb. per million Btu, when operating on gas. 

Env-A 1306.03 Emission Standards for Combustion Turbines. A combustion turbine that is not 

subject to.Env-A 1306.02 shall be limited at all times to the applicable hourly average NOx RACT 

emission limits specified below: 

(a) For combined and regenerative cycle combustion turbines: 

(I) For gas-fired turbines without oil back-up, 42 ppmvd, corrected to 15% 02, or 0.155 lb. per 

million Btu; 

(2) For gas-fired turbines with oil back-up, the more stringent of: 

a. When operating on gas, 42 ppmvd, corrected to 15% 02, or 0.155 lb. per million Btu; or 

b. When operating on oil, 65 ppmvd, corrected to 15% 02, or 0.253 lb. per million Btu; and 

(3) For oil-fired turbines, 65 ppmvd, corrected to 15% 02, or 0.253 lb. per million Btu; 

(b) For simple cycle combustion turbines: 

(I) For gas-fired turbines without oil back-up, 55 ppmvd, corrected to 15% 02, or 0.203 lb. per 

million Btu; 

(2) For oil-fired turbines, 75 ppmvd, corrected to 15% 02, or 0.292 lb. per million Btu; and 

(3) For gas-fired turbines with oil back-up: 

a. When operating on gas, 55 ppmvd, corrected to 15% 02, or 0.203 lb. per million Btu; and 

b. When operating on oil, 75 ppmvd, corrected to l 5% 02, or 0.292 lb. per million Btu . 

. PART Env-A 1307 STATIONARY INTERNAL COMBUSTION ENGINES 

Env-A 1307.01 Applicability. 

(a) All stationary internal combustion engines meeting the applicability criteria of Env-A 130 1.02(t) 

shall be subject to this part. 

(b) Stationary internal combustion engines excluded from Env-A 1301.02(t) because they are used 

as emergency generators shall be subject to Env-A 13 l 1 in lieu of this part if they meet the applicability 

criteria of Env-A 130 l.02U). 

(c) Stationary internal combustion engines excluded from Env-A 130 1.02(t) because they are used 

as load shaving units shall be subject to Env-A 1313 in lieu of this part if they meet the applicability criteria 

of Env-A 130 1.02(1). 

Env-A 1307.02 Emission Standards for Stationary Internal Combustion Engines. Stqtionary internal 

combustion engines shall not exceed the hourly average NOx RACT emission limits specified below: 
2010-81 Adopted effective 10-31-10 14 

(a) For rich burn internal combustion engines, 1.5 grams per rated brake horsepower- hour (bhp-hr) 

for gas-fired units; and 

(b) For lean burn internal combustion engines: 

(I) For gas-fired units, 2.5 grams per bhp-hr; and 

(2) For oil-fired units, 8.0 grams per bhp-hr, or 2.44 lb. per million Btu. 

PART Env-A 1308 ASPHALT PLANT ROTARY DRYERS 

Env-A 1308.01 Applicability. Any asphalt plant rotary dryer meeting the applicability criteria of 

Env-A 130 1.02(g) shall be subject to this part. 

Env-A 1308.02 Definitions. For the purpose of this part, the following definitions shall apply: 

(a) "Batch type asphalt plant" means an asphalt plant where equipment external to the rotary dryer is 

used to mix the aggregate and asphalt cement or other binder; 

(b) "Drum mix type asphalt plant" means an asphalt plant where the asphalt cement or other binder 

is added to the aggregate while the aggregate is in the rotary dryer; and 

(c) "Rotary dryer" means a cylinder which rotates about a fixed axis and through which hot gases 

are passed for the purpose of removing moisture from solid material. 

Env-A 1308.03 Emission Standards for Asphalt Plant Dryers. Any asphalt plant rotary dryer, whether 

a batch type asphalt plant or a drum mix type asphalt plant, shall not exceed an hourly average NOx RACT 

emission limit of 0.12 lb. per ton of asphalt produced, equivalent to 0.429 lb. per million Btu. 

PART Env-A 1309 INCINERATORS 

Env-A 1309.01 Applicability. 

(a) All incinerators meeting the applicability criteria of Env-A I 30 1.02(h) shall be subject to the 

provisions of this part. 

(b) Incinerators excluded from Env-A 130 1.02(h) because they combust sewage sludge shall be 

subject to Env-A 1314 in lieu of this part if they meet the applicability criteria of Env-A I. 30 1.02(m}. 

Env-A 1309.02 Emission Standards for Incinerators. An incinerator shall not exceed a 24-hour 

calendar day average NOx RACT emission limit of 0.53 lb. per million Btu. 

P!UT knUJ lJ W Uf ALLUO!Iill MJlJlJU ~UUliNO DACILITillJ 

Env-A 1310.01 Applicability. Any wallboard dryer, calcining mill, calciner, or gypsum rock dryer 

meeting the applicability criteria of Env-A 130 1.02(i) shall be subject to this part. 

Env-A 1310.02 Emission Standards for Wallboard Manufacturing Facilities. 

(a) Any wallboard dryer, calcining mill, calciner, or gypsum rock dryer shall comply with the 

applicable NOx RACT requirements specified in Env-A 1310.03 and Env-A 1310.04. 

(b) For purposes ofEnv-A 1310.03 and Env-A 1310.04, NOx RACT control technology shall be: 

(1) The installation, operation, and maintenance of low NOx burners (LNB); or 
20 I 0-81 Adopted effccti ve 10-31-10 15 

(2) The installation, operation, and maintenance of air pollution control equipment or an air 

pollution control process having equivalent or greater NOx removal efficiency as LNB, as 

approved by the department and EPA as specified in Env-A 1316 relative to NOx RACf orders. 

Env-A 1310.03 Emission Standards for Wallboard Manufacturing Facilities Firing Natural Gas. 

For wallboard dryers, calcining mills, calciners, and gypsum rock dryers firing nawral gas, the NOx RACT 

requirements shall be as follows: 

(a) An emission limit of 0. J 0 lb. per million Btu, based on an hourly average; or 

(b) Implement NOx RACT control technology as specified in Env-A 13 10.02(b). 

Env-A 1310.04 Emission Standards for Wallboard Manufacturing Facilities Firing Oil. For wallboard 

dryers, calcining mills, calciners, and gypsum rock dryers firing fuel oil, the NOx RACT requirements shall 

be as follows: 

(a) When firing #2 fuel oil: 

(I) An emission limit of 0.10 lb. per million Btu, based on an hourly average; or 

(2) Implement NOx RACT control technology as specified in Env-A 131 0.02(b). 

(b) When firing #4,#5, or #6 fuel oil: 

(I) An emission limit of 0.30 lb. per million Btu, based on a 24- hour calendar day average; or 

(2) Implement NOx RACT control technology as specified in Env-A 1310.02(b). 

PART Env-A 1311 EMERGENCY GENERATORS 

Env-A 1311.01 Applicability. Emergency generators meeting the applicability criteria of Env-A 

1301.020) shall be subject to this part. 

Env-A 1311.02 Operating Hours: Limit, Consequences of Exceeding Limit. 

(a) Each emergency generator subject to this part shall be limited to less than 500 hours of operation 

per year during any consecutive 12-month period by an enforceable permit issued by the department. 

(b) If the hours of operation of any emergency generator exceed 500 hours for any consecutive 12-

month period, then: 

( 1) The owner or operator of the emergency generator shall notify the department in writing 

within 10 days of the exceedance; and 

(2) The emergency generator shall immediately become subject to the requirements of Env-A 

1306 or Env-A 1307, as applicable to the device type and fuel type. 

Env-A 1311.03 Control Requirements for Stationary Combustion Turbines. The owner or operator 

of a stationary combustion turbine used as an emergency generator shall: 

(a) Adjust the combustion process of the combustion turbine, before April 1st of each year, in 

accordance with the following: 

(I) Inspect the burner, the flame pattern from the burner, and the systems which control the 

air-to-fuel ratio; 

(2) Adjust the air-to-fuel ratio in accordance with the results of the inspections performed; 

(3) Determine the effect of the adjustment upon NOx emissions; 
l11 

(3) The exhaust port temperature increases beyond the manufacturer's recommended 

maximum operating temperature; or 

(4) The opacity of the emissions from the engine exhaust is equal to or greater than 20% 

opacity; 

(b) Install, operate, and maintain an elapsed time meter for each engine to indicate, in cumulative 

hours, the elapsed engine operating time for the previous 12 months; 

(c) Determine the hours of operation for each engine for the previous 12-month period on a monthly 

basis; and 

(d) Maintain records to certify that the ignition timing of the engine has been inspected and adjusted 

at least once every 3 years. 
2010-81 Adopted effective I 0-31-10 15 

(2) The installation, operation, and maintenance of air pollution control equipment or an air 

pollution control process having equivalent or greater NOx removal efficiency as LNB, as 

approved by the department and EPA as specified in Env-A 1316 relative to NOx RACT orders. 

Env-A 1310.03 Emission Standards for Wallboard Manufacturing Facilities Firing Natural Gas. 

For wallboard dryers, calcining mills, calciners, and gypsum rock dryers firing natural gas, the NOx RACT 

requirements shall be as follows: 

(a) An emission limit of 0.10 lb. per million Btu, based on an hourly average; or 

(b) Implement NOx RACT control technology as specified in Env-A 1310.02(b). 

Env-A 1310.04 Emission Standards for Wallboard Manufacturing Facilities Firing Oil. For wallboard 

dryers, calcining mills, calciners, and gypsum rock dryers firing fuel oil, the NOx RACT requirements shall 

be as follows: 

(a) When firing #2 fuel oil: 

(I) An emission limit of 0.10 lb. per million Btu, based on an hourly average; or 

(2) Implement NOx RACT control technology as specified in Env-A I 31 0.02(b). 

(b) When firing #4,#5, or #6 fuel oil: 

(I) An emission limit of 0.30 lb. per million Btu, based on a 24- hour calendar day average; or 

(2) Implement NOx RACT control technology as specified in Env-A 131 0.02(b). 

PART Env-A 1311 EMERGENCY GENERATORS 

Env-A 1311.01 Applicability. Emergency generators meeting the applicability criteria of Env-A 

130 1.02U) shall be subject to this part. 

Env-A I 311.02 Operating Hours: Limit, Consequences of Exceeding Limit. 

(a) Each emergency generator subject to this part shall be limited to less than 500 hours of operation 

per year during any consecutive 12-month period by an enforceable permit issued by the department. 

(b) If the hours of operation of any emergency generator exceed 500 hours for any consecutive 12-

month period, then: 

(I) The owner or operator of the emergency generator shall notify the department in writing 

within 10 days of the exceedance; and 

(2) The emergency generator shall immediately become subject to the requirements of Env-A 

1306 or Env-A 1307, as applicable to the device type and fuel type. 

Env-A 1311.03 Control Requirements for Stationary Combustion Turbines. The owner or operator 

of a stationary combustion turbine used as an emergency generator shall: 

(a) Adjust the combustion process of the combustion turbine, before April 1st of each year, in 

accordance with the following: 

(1) Inspect the burner, the flame pattern from the burner, and the systems which control the 

air-to-fuel ratio; 

(2) Adjust the air-to-fuel ratio in accordance with the results of the inspections performed; 

(3) Determine the effect of the adjustment upon NOx emissions; 
20 I 0-81 Adopted effective I 0-3 1-10 16 

(4) Re-adjust the air-to-fuel ratio based on results of the previous adjustment performed to 

minimize total NOx emissions; and 

(5) Confirm that NOx emissions from the equipment or source operation do not cause an 

exceedance of any maximum allowable emission rate for NOx or any other state and federally 

regulated air pollutant, or any opacity standard specified in Env-A 2000; 

(b) Maintain, in a format that can be retained unaltered for the time period specified in Env-A 902, 

the following information: 

( 1) The date on which the combustion process was last adjusted; 

(2) The name, title, and affiliation of the individual who made the adjustments; 

(3) The NOx emission concentration, in ppmvd, corrected to 15% oxygen, after the 

adjustments are made; 

(4) The CO emission concentration, in ppmvd, corrected to 15% oxygen, after the adjustments 

are made; 

(5) The opacity readings; and 

(6) Any other information required by Env-A 903 or Env-A 905; 

(c) Install, operate, and maintain an elapsed time meter for each engine to indicate, in cumulative 

hours, the elapsed engine operating time for the previous 12 months; and 

(d) Determine the hours of operation for each engine for the previous 12-month period on a monthly 

basis. 

Env-A 13 11.04 Control Requirements for Stationary Internal Combustion Engines Having Manual 

Adjustment Capabilities. The owner or operator of a stationary internal combustion engine that is used as 

an emergency generator and that allows for manual adjustment of the air-to-fuel ratio or ignition timing in 

order to affect the combustion process, shall: 

(a) Set and maintain the ignition timing of the engine 4 degrees retarded relative to standard timing, 

provided that the ignition timing shall not be retarded beyond the point that: 

(1) The CO emission concentration increases beyond 100 pmvd, corrected to 15% oxygen; 

(2) The turbocharger speed is increased beyond the maximum operating speed recommended 

by the manufacturer; 

(3) The exhaust port temperature increases beyond the manufacturer's recommended 

maximum operating temperature; or 

(4) The opacity of the emissions from the engine exhaust is equal to or greater than 20% 

opacity; 

(b) Install, operate, and maintain an elapsed time meter for each engine to indicate, in cumulative 

hours, the elapsed engine operating time for the previous 12 months; 

(c) Determine the hours of operation for each engine for the previous 12-month period on a monthly 

basis; and 

(d) Maintain records to certify that the ignition timing of the engine has been inspected and adjusted 

at least once every 3 years. 
2010-81 Adopted effective 10-31-I 0 17 

Env-A I 3 I 1.05 Control Requirements and Emission Limits for Stationary Internal Combustion 

Turbines Not Having Manual Adjustment Capabilities. The owner or operator of a stationary internal 

combustion engine that is used as an emergency generator and that does not allow for manual adjustment of 

the air-to-fuel ratio or ignition timing in order to affect the combustion process, shall: 

(a) Install, operate, and maintain an elapsed time meter for each engine to indicate, in cumulative 

hours, the elapsed engine operating time for the previous 12 months; 

{b) Determine the hours of operation for each engine for the previous 12-month period on a monthly 

basis; 

(c) Operate the generator in conformance with the generator manufacturer's instructions, such as 

following maintenance and operating requirements to help minimize emissions; and 

(d) Engines subject to 40 CPR Part 60 shall maintain the generator manufacturer's instructions at 

the facility so that they arc available for review. 

Env-A 1311.06 Calculating Emissions. The emissions from emergency generators shall be included 

in the calculation of both the actual and theoretical potential emissions from a stationary source. 

PART Env-A 1312 AUXILIARY BOILERS 

Env-A 1312.01 Applicability. An auxiliary boiler meeting the applicability criteria of Env-A 

130 1.02(k) shall be subject to this part. 

Env-A 1312.02 Emission Standards for Auxiliary Boilers. 

(a) An auxiliary boiler with a heat input rate of at least 5 million Btu per hour but Jess than 50 

million Btu per hour shall comply with Env-A 1305.02 and Env-A 1305.03. 

(b) An auxiliary boiler with a heat input rate of at least 50 million Btu per hour, shall not exceed a 

NOx RACT emission limit of 0.20 lb. per million Btu based on a 24-hour calendar day average, regardless 

of the type of fuel burned. 

Env-A 13 I 2.03 Calculating Emissions. The emissions from all auxiliary boilers shall be included in 

the calculation of both the actual and theoretical potential emissions from the stationary source. 

PARTEnv-A 1313 LOAD SHAVING UNITS 

Env-A 1313.01 Applicability. 

(a) All load shaving units meeting the applicability criteria of Env-A 1301.02(1) shall be subject to 

this part. 

(b) If the actual NOx emissions from any load shaving unit exceed 50 tons during any consecutive 

12-month period, the load shaving unit shall immediately become subject to the requirements of Env-A 

1306 or Env-A 1307, as applicable to the device type and fuel type. 

Env-A I 3 I 3.02 Emission Standards for Load Shaving Units. 

(a) Stationary combustion turbines used as load shaving units shall not exceed a NOx RACT 

emission limit of 0.90 lb. per million Btu heat input based on an hourly average for any type of fuel. 

(b) Stationary internal combustion engines used as load shaving units shall not exceed the 

applicable hourly average NOx RACT emission limits specified below: 
20 I 0-81 Adopted effective I 0-31-1 0 I 8 

(I) For rich burn internal combustion engines, 2.0 grams per bhp-hr for gas-fired units; and 

(2) For Jean burn internal combustion engines: 

a. For gas-fired units, 3.0 grams per bhp-hr; and 

b. For oil-fired units, 9.0 grams per bhp-hr, or 2.74 lb. per million Btu. 

Env-A 1313.03 Calculating Emissions. The emissions from all load shaving units shall be included 

in the calculation of both the actual and theoretical potential emissions from the stationary source. 

PART Env-A 1314 MISCELLANEOUS STATIONARY SOURCES 

Env-A 13 I 4.01 Emission Standards and Control Options for Miscellaneous Stationary Sources. 

Owners or operators of any miscellaneous stationary sources meeting the applicability criteria of Env-A 

1301.02(m) shall: 

(a) Initiate and implement a study of RACT control options, consisting of a detailed examination of 

technological and economic feasibility of available NOx control techniques for all classifiable and 

unclassifiable NOx-emitting sources, devices, or processes; and 

(b) Apply for and obtain from the department a RACT order in accordance with Env-A 1316. 

PART Env-A 1315 RACT COMPLIANCE 

Env-A 1315.01 Testing, Recordkeeping. and Recording for NOx RACT Compliance. 

(a) Stationary sources subject to this chapter shall comply with the testing requirements specified in 

Env-A 800. 

(b) Except when a source is subject to (d) or (e), below, compliance with the NOx RACT emission 

standards specified in this chapter shall be determined: 

(1) In accordance with Env-A 803; or 

(2) By a CEM system for NOx, if a CEM system is require.d by a permit issued pursuant to 

Env-A 600 or by Env-A 1315. 02. 

(c) Except when purchasing NOx allowances pursuant to Env-A 3100, rccordkeeping and reporting 

shall be in accordance with Env-A 900. 

(d) The owner or operator of a source subject to Env-A 2900, Multiple Pollutant Annual Budget 

Trading and Banking Program, shall comply with the testing and monitoring requirements specified in EnvA 800 and in Env-A 2900 and the recordkeeping and reporting requirements of Env-A 900 and Env-A 

2900. In the event of a conflict between Env-A 2900 and Env-A 800 or Env-A 900, the requirements of 

Env-A 2900 shall apply. 

(e) The owner or operator of a source subject to Env-A 3200, NOx Budget Trading Program, shall 

comply with the testing and monitoring requirements specified in Env-A 800 and in Env-A 3200 and the 

recordkeeping and reporting requirements of Env-A 900 and Env-A 3200. In the event of a conflict 

between Env-A 3200 and Env-A 800 or Env-A 900, the requirements of Env-A 3200 shall apply. 

Env-A 1315.02 CEM Requirements for NOx. The department shall require installation, operation, 

maintenance, and quality assurance testing of a CEM system for NOx which meets all applicable 

requirements specified in Env-A 800 if any of the following conditions exist: 
2010-81 Adopted effective I 0-31-I 0 19 

(a) A source uses air pollution control equipment in order to maintain compliance with a NOx 

emission limit, and continuous emission monitoring is necessary to ensure that the emission limit is not 

exceeded and that the control equipment is performing correctly; 

(b) A stationary source is otherwise subject to the CEM provisions of Env-A 800; 

(c) A stationary source or device generates emissions credits for the purpose of emission averaging 

pursuant to Env-A 1315 .04; or 

(d) A stationary source or device uses seasonal emission control techniques, in accordance with 

Env-A I 3 I 5.06, in order to comply with NOx RACT. 

Env-A 1315.03 Alternatives to Meeting Specified RACT Emission Limits. 

(a) Compliance with the NOx RACT emission limits specified in this chapter may be achieved 

through the purchase of NOx allowances that are converted to and used as discrete emission reductions 

(DERs) in accordance with Env-A 3 I 00. 

(b) NOx RACT emission limits other than those specified in Env-A 1303 through Env-A 1313 shall 

be allowable as an alternative to the specified limits for all NOx emitting processes and devices regulated 

under this chapter, except for wet-bottom cyclone fired utility boilers subject to the NOx RACT 

requirements specified in Env-A 1303.05. 

(c) To obtain alternative NOx RACT emission limits for a source, the owner or operator of the 

source shall request a NOx RACT order from the department in accordance with Env-A 1316. 

Env-A 1315.04 Emissions Averaging for Multiple Sources Under Common Ownership. 

(a) For the purposes of this section, "bubble" means an option taken by the owner of 2 or more 

stationary sources to use emissions averaging so as to impose controls that are more ·stringent than RACT 

level on one or more emissions units at one or more of the owner's stationary sources while simultaneously 

imposing controls that are less stringent than RACT level on other emissions units at the same or other of 

the owner's stationary sources, including the option of no controls on such units, in order to achieve the 

same overall amount of emission reduction required by the SIP in a more cost effective manner. 

(b) Emissions averaging shall be allowed for NOx emissions from 2 or more stationary sources only 

if all of the requirements of this section are met. 

(c) All of the stationary sources to be included in the emissions averaging shall be: 

(I) Located in New Hampshire; and 

(2) Under the control of a single owner. 

(d) Emissions averaging, including identifying allowable emission averaging periods, shall be done 

in accordance with EPA's emissions trading policy, as described at 51 FR 43814 and 51 FR 43850. 

(e) Emission reduction credits generated for the purpose of emission averaging shall: 

(I) Be real, surplus, permanent, quantifiable, federally-enforceable, and transferable within the 

bubble within a given calendar year; and 

{2) Conform to 40 CFR 51.165, as revised June 28, 1989, RSA 125-J, Env-A 3000, and Env-A 

3100. 

(f) Emissions averaging shall be enforced by means of federally-enforceable conditions contained 

in the permits for the stationary sources issued by the department as a source-specific SIP revision, or by 
20 I 0-81 Adopted cff ccti ve I 0-3 1-1 0 20 

federally-enforceable permits issued by the department or EPA, for all stationary sources to be included in 

the averaging. 

(g) The recordkeeping and reporting requirements for emission averaging shall: 

(I) Be in accordance with Env-A 900; and 

(2) Include a summary of the emissions, emissions reduction credit transfers, applicable transfer 

ratios, and adjusted emissions, after transfer, of each affected stationary source. 

(h) Each stationary source to be included in the emissions averaging shall calculate the total 

allowable NOx emissions using the equation specified in Env-A 1315.05 for each 24-hour calendar day. 

Compliance with the NOx RACT weighted average allowable emission rate so calculated shall be based on 

the weighted average actual NOx emissions from the emjssions unit(s) that are operating on a given day. 

(i) Emission reduction credits generated from reductions at any stationary source included in emissions 

averaging may be used for compliance with the total allowable NOx emissions calculated pursuant to (h), 

above, by any other stationary source(s) within the bubble. 

G) The owner or operator of each stationary source to be included in the emissions averaging shall: 

(I) Calculate daily emissions: 

a. For those emjssions units generating credits for the purpose of emissions averaging, 

based on the installation of CEMs in accordance with Env-A 1315.02; or 

b. For those emissions units for which CEMs are not required under Env-A 1315.02, based on: 

l. The worst case emission rate(s) for the device(s) or source(s) established through 

stack testing performed in accordance with Env-A 800 and approved by EPA; and 

2. The hours of operation measured in accordance with a method approved by EPA; and 

(2) Comply with the recordkeeping and reporting requirements specified in Env-A 900. 

Env-A 1315.05 Emissions Averaging Equation. 

(a) "E" means the total allowable emissions from all stationary sources included in the emissions 

averaging, in pounds per day. 

(b) "AI, A2, ... , An" means the applicable emission lirrut for each unit of production, such as 

lb/MMBtu, as specified in this chapter. 

(c) "B I, B2, ... , Bn" means the maximum number of units of production per day, such as 

MMBtulday, based on the maximum gross heat input rate of each emissions unit included in the errussions 

averaging. 

(d) To calculate the total allowable emissions from all stationary sources included in the emissions 

averaging in pounds per day, the owner or operator shall multiply AI times Bl, A2 time B2, and so forth, 

and then sum the products, as jn the formula below: 

E =(A 1 x B 1) + (A2 x B2) + ... + (An x Bn) 

Env-A 1315.06 Seasonal Control of NOx Emissions. 

(a) A stationary source that is subject to this chapter may use seasonal emission control techniques 

in order to comply with NOx RACT, as specified in (b) through (f), below. 

(b) Any stationary source using post-combustion NOx air pollution control equipment to comply 

with NOx RACT during the ozone season shall continue to operate said equipment during the remainder of 

the calendar year. 
2010-81 Adopted effective 10-31-10 21 

(c) The allowable annual NOx mass emission rate, in tons per year, shall be less than or equal to the 

annual NOx mass emission rate that would be calculated by multiplying the actual annual production rate, for 

example Btu per year, by the applicable emission limit, for example lbs. NOx per million Btu, as specified in 

Env-A 1303 through Env-A 1313 for all emissions units and fuels in use prior to December 31, 1990. 

(d) Annual NOx emissions limits shall be based on the lower of the actual or allowable NOx 

emissions for calendar year 1990, unless NOx emissions and operational data submitted by the owner or 

operator, and approved by the department in accordance with (e), below, demonstrate that NOx emissions 

from the source for calendar year 1990 are not representative of normal operations. In no case shall NOx 

emissions data for years prior to calendar year 1989 be used to represent normal operations for the purpose 

of emissions averaging. 

(e) The department shall use EPA-approved methods and procedures as specified in 40 CFR 

§51.165 for determining whether the NOx and operational data submitted by the owner or operator is 

adequate to demonstrate that NOx emissions for calendar year 1990 are not representative of normal 

operations. 

(f) Emissions averaging to meet NOx RACT requirements on a seasonal basis shall be allowable in 

accordance with the following requirements: 

(I) A 24-hour calendar day average NOx mass emission limit shall be established for the 

ozone season based on the applicable limit specified in Env-A 1303 through Env-A 1313 for all 

emissions units and fuels in use prior to December 31, 1992; 

(2) A 24-hour calendar day average NOx mass emission limit shall be established for the 

remainder of the year based on the uncontrolled emission rate of the emissions unit determined 

by CEM data or stack test data; 

(3) An allowable average annual NOx mass emission limit shall be established in accordance 

with (c), above; 

(4) The sum of the NOx mass emissions during the ozone season and the NOx mass emissions 

during the remainder of the calendar year shall be less than or equal to the lesser of the annual 

NOx mass emissions that would have been allowed under Env-A 1303 through Env-A 1313 or 

the annual NOx mass emissions otherwise allowed under Env-A 611, Env-A 618, Env-A 619, 

Env-A 1314, Env-A 1315.03, Env-A 1315.04, Env-A 2900 through Env-A 3300, Env-A 3500, 

Env-A 3700, and Env-A 4300; 

(5) Emissions from replacement power sources shall be calculated by multiplying the actual 

production rate for the device, for example Btu per hour, by the allowable NOx mass emission 

rate for the device, for example lb. NOx per million Btu; 

(6) For multiple sources under common ownership using the bubble specified in Env-A 1315.04, 

the applicable emission limit for each unit of production referred to in the formula in Env-A 

1315.05 shall be established in accordance with the applicable provisions of this part; and 

(7) All stationary sources using seasonal controls shall: 

a. Install CEMs to the extent required by Env-A 1315.02 and Env-A 800; 

b. Calculate daily emissions in accordance with Env-A 1315.02 and Env-A 800; 

c. Calculate annual emissions in accordance with this part ; and 

d. Comply with the applicable recordkeeping and reporting requirements specified in EnvA 900. 
20 I 0-81 Adopted effective I 0-31 - 10 22 

PART Env-A 1316 NOx RACT ORDERS 

Env-A 1316.01 Definitions. For the purpose of this part, the following definitions shall apply: 

(a) "Determination of insufficiency" means a written determination by the department that the 

documentation submitted by an applicant pursuant to Env-A 1316.02(a), is inadequate for the department to 

issue a NOx RACT order; and 

(b) "Determination of sufficiency" means a written determinationby the department that the 

documentation submitted by an applicant pursuant to Env-A 1316.02(a), is adequate for the department to 

issue a NOx RACT order. 

Env-A 1316.02 Requests for NOx RACT Orders: Initial Determinations Regarding Sufficiency. 

(a) To request a NOx RACT order, the owner or operator of any miscellaneous stationary source 

subject to the provisions of Env-A 1314 or any source, device or process seeking alternative RACT 

emission limits pursuant to Env-A 1315.03 shall submit the information, including a feasibility study, as 

specified in Env-A 1316.04 to the department within 120 days of the date when the source becomes subject 

to this chapter. 

(b) Within 60 days of receipt of information submitted pursuant to (a), above, the department shall 

review all information submitted and notify the person requesting the alternative emissions limits 

(requestor) in writing of its initial determination of sufficiency or initial determination of insufficiency. 

(c) If the department makes an initial determination of insufficiency, the notice sent pursuant to (b), 

above, shall include: 

(1) A request for the additional information that is necessary for the department to make a 

determination of sufficiency; and 

(2) A statement that if a complete response to the request for additional information is not 

received by the department within 60 days of the date of the notice sent pursuant to (b), above, a 

final determination of insufficiency will be made. 

Env-A 1316.03 Final Determinations Regarding Sufficiency; Proposed NOx RACT Orders. 

(a) If an initial determination of sufficiency is made, then within 60 days of the initial determination 

of sufficiency the department shall: 

(1) Make a final-determination of sufficiency and present to EPA and the requestor a proposed 

RACT order that contains the information specified in (c), below; and 

(2) Proceed as specified in Env-A 1316.05 relative to public notice. 

(b) If an initial determination of insufficiency is made, then within 60 days of the initial 

determination of insufficiency the department shall: 

(1) If the requestor files a response within the specified time period which contains information 

that is sufficient to allow a determination of sufficiency to be made, make a final determination 

of sufficiency and: 

a. Present to EPA and the requestor a proposed NOx RACT order that contains the 

information specified in (c), below; and 

b. Proceed as specified in Env-A 1316.05 relative to public notice; or 

(2) If the requestor does not file a response within the specified time period which contains 

information that is sufficient to allow a determination of sufficiency to be made, terminate the 

permit process and issue a final determination of insufficiency. 
2010-81 Adopted effeeli ve 1 0-3 1-10 23 

(c) A proposed NOx RACT order issued pursuant to (a)(l) or (b)(1) shall contain the following: 

(1) An inventory of all NOx-emitting sources, devices, or processes; 

(2) Emission limits for all NOx-emitting sources, devices, or processes; 

(3) A schedule requiring compliance with the RACT emission limits that contains the elements 

described in Env-A 1316.04(g); 

(4) Procedures for determining initial compliance with the emission limits; 

(5) Procedures for assessing continuous compliance with the emission limits; and 

(6) Record keeping and reporting requirements in accordance with the provisions of Env-A 900. 

Env-A 1316.04 Information Required for NOx RACf Order Request. The information required by 

Env-A 1316.02(a) shall be as follows: 

(a) An inventory of all NOx-emitting sources, devices, or processes at the facility; 

(b) The maximum NOx-emitting capacity of each NOx-emitting source, device, or process; 

(c) The actual amount of NOx emitted based on heat input, fuel consumption, or equivalent method 

acceptable to the department, for each day during the previous calendar year, from each affected NOxemitting source, device or process at the facility; 

(d) A feasibility study of RACT options, comprising: 

(I) Identification of all available NOx control techniques and other options for all applicable 

NOx emitting sources, devices, or processes for which alternative RACT emission limits are 

sought, including but not limited to using ERCs orDERs, changing to low-NOx emitting 

processes, and, for utility boilers, the following: 

a. Low-NOx burners; 

b. Overfire air; 

c. Flue gas recirculation; 

d. Natural gas reburn; 

e. Burners out of service; 

f. Use of alternative fuels; 

g. Selective catalytic reduction (SCR); and 

h. Selective non-catalytic reduction (SNCR); and 

(2) An examination of the technical and economical feasibility of each option identified; 

(e) The control option selected, stating emission limits, monitoring, recordkeeping and reporting 

procedures, and test methods to demonstrate compliance; 

(f) The amount of NOx that is proposed to be controlled from each NOx-emitting source, device or 

process identified in the inventory required by (a), above; and 

(g) A schedule for implementation, which identifies the commitment dates for the major increments 

of progress toward compliance, inc luding: 

(I) Completion of engineering; 

(2) Submission of air pollution permit application; 
(3) Awarding of contract; 

( 4) Initiation of construction; 

(5) Completion of construction; 

(6) Initial compliance testing; 

(7) Submission of compliance tests reports; and 

20 l 0-81 Adopted cffecti ve I 0-31-1 0 24 

(8) Final compliance with emission or control requirements of this chapter. 

Env-A 1316.05 Public Notice; Opportunity for Comment. 

(a) Within 30 days of issuing a proposed NOx RACT order, the department shall cause a public notice 

of the proposed NOx RACT order to be published once in a newspaper of daily statewide circulation and once 

in a newspaper in the general locality of the source for which the alternative NOx compliance is being sought. 

(b) The notice published pursuant to (a), above, shall: 

(1) Briefly describe the proposed NOx RACf order; 

(2) Offer the opportunity for a hearing; 

(3) State where the full proposal is available for inspection, including whether the proposal can 

be accessed electronicaUy; 

(4) Identify the name and contact information for the individual at the depmtment to whom a 

request for a hearing and written comments should be directed; and 

(5) Specify that comments are due to the department within 30 days of publication of the notice 

or I 0 days after the public hearing, if one is requested. 

(c) If a public hearing on the proposal is requested, the department shall: 

(I) At least 30 days prior to conducting the hearing, publish a notice in a newspaper of daily 

statewide circulation, stating the place, date, and time of the hearing; 

(2) Conduct the hearing on the proposed NOx RACT order as specified in the published notice 

in accordance with the non-adjudicative hearing procedures specified in Env-C 200; and 

(3) Accept written comments on the proposal until 10 days after the public hearing. 

Env-A 1316.06 Issuance of NOx RACT Order. 

(a) After considering all public comment received and within 60 days of the date of the public 

hearing on the proposed NOx RACT order, the department shall issue a final NOx RACf order to the 

owner or operator of the affected source, device, or process. 

(b) Within 60 days of the issuance of a final NOx RACT order, the department shall submit to EPA 

a revision to the State Implementation Plan (SIP) to reflect the NOx RACT order. 

(c) Upon issuance of the final NOx RACT order, the department shall issue a permit to the owner or 

operator of the affected source, device, or process which incorporates all of the terms and conditions of the 

final NOx RACT order. 

(d) The owner or operator of any source, device, or process for which a final NOx RACT order has 

been issued shall comply with all of the terms and conditions of the final NOx RACT order immediately 

upon the issuance of such order by the department 
20 1 0-8 I Adopted effective 1 0-3 I- I 0 25 

Appendix 

Rule Scction(s) Federal Statute(s Im lcmented 

Env-A 1300 RSA 125-C:4, I(a 42 U.S.C. Sections 7410, 7502(c) & 751 lc