N.M. Admin. Code § 20.2.79.7

Current through Register Vol. 35, No. 21, November 5, 2024

Section 20.2.79.7 - DEFINITIONS

In addition to the terms defined in 20.2.2.7 NMAC (Definitions), as used in this part, the following terms apply.

A."Actual emissions" means the actual rate of emissions of a regulated new source review pollutant from an emissions unit, as determined in accordance with the following, except that this definition shall not apply for calculating whether a significant emissions increase has occurred, or for establishing a plantwide applicability limit under 20.2.79.120 NMAC. Instead, Subsections E and AI of this section shall apply for those purposes.

(1) In general, actual emissions as of a particular date shall equal the average rate, in tons per year, at which the unit actually emitted the pollutant during a consecutive 24-month period which precedes the particular date and which is representative of normal source operation. The department shall allow the use of a different time period upon a determination that it is more representative of normal source operation. Actual emissions shall be calculated using the unit's actual operating hours, production rates, and types of materials processed, stored, or combusted during the selected time period.

(2) The department may presume that source-specific allowable emissions for the unit are equivalent to the actual emissions of the unit.

(3) For any emissions unit that has not begun normal operations on the particular date, actual emissions shall equal the potential to emit of the unit on that date.

B."Administrator" means the administrator of the U.S. environmental protection agency (EPA) or an authorized representative.

C."Adverse impact on visibility" means visibility impairment which interferes with the management, protection, preservation, or enjoyment of the visitor's visual experience of the mandatory federal class I area. This determination must be made on a case-by-case basis taking into account the geographic extent, intensity, duration, frequency, and time of the visibility impairments and how these factors correlate with:

(1) times of visitor use of the mandatory federal class I area; and

(2) the frequency and timing of natural conditions that reduce visibility. This term does not include effects on integral vistas as defined in 40 CFR 51.301 Definitions.

D."Allowable emissions" means the emissions rate of a stationary source calculated using the maximum rated capacity of the source (unless the source is subject to federally enforceable limits which restrict the operating rate, or hours of operation, or both) and the most stringent of the following:

(1) the applicable standard set forth in 40 CFR Part 60 or 61 ;

(2) any applicable state implementation plan emissions limitation including those with a future compliance date; or

(3) the emissions rate specified as a federally enforceable permit condition, including those with a future compliance date.

E."Baseline actual emissions" means the rate of emissions, in tons per year, of a regulated new source review pollutant, as determined in accordance with the following.

(1) For any existing electric utility steam generating unit, baseline actual emissions means the average rate, in tons per year, at which the unit actually emitted the pollutant during any consecutive 24-month period selected by the owner or operator within the 5-year period immediately preceding when the owner or operator begins actual construction of the project. The department shall allow the use of a different time period upon a determination that it is more representative of normal source operation.

(a) The average rate shall include fugitive emissions to the extent quantifiable, and emissions associated with startups, shutdowns, and malfunctions.

(b) The average rate shall be adjusted downward to exclude any noncompliant emissions that occurred while the source was operating above any emission limitation that was legally enforceable during the consecutive 24-month period.

(c) For a regulated new source review pollutant, when a project involves multiple emissions units, only one consecutive 24-month period must be used to determine the baseline actual emissions for the emissions units being changed. A different consecutive 24-month period can be used for each regulated new source review pollutant.

(d) The average rate shall not be based on any consecutive 24-month period for which there is inadequate information for determining annual emissions, in tons per year, and for adjusting this amount if required by Subparagraph (b) of Paragraph (1) of this subsection.

(2) For an existing emissions unit (other than an electric utility steam generating unit), baseline actual emissions means the average rate, in tons per year, at which the emissions unit actually emitted the pollutant during any consecutive 24-month period selected by the owner or operator within the 10-year period immediately preceding either the date the owner or operator begins actual construction of the project, or the date a complete permit application is received by the department for a permit required either under this section or under a plan approved by the administrator, whichever is earlier, except that the 10-year period shall not include any period earlier than November 15, 1990.

(a) The average rate shall include fugitive emissions to the extent quantifiable, and emissions associated with startups, shutdowns, and malfunctions.

(b) The average rate shall be adjusted downward to exclude any noncompliant emissions that occurred while the source was operating above an emission limitation that was legally enforceable during the consecutive 24-month period.

(c) The average rate shall be adjusted downward to exclude any emissions that would have exceeded an emission limitation with which the major stationary source must currently comply, had such major stationary source been required to comply with such limitations during the consecutive 24-month period. However, if an emission limitation is part of a maximum achievable control technology standard that the administrator proposed or promulgated under 40 CFR Part 63, the baseline actual emissions need only be adjusted if the state has taken credit for such emissions reductions in an attainment demonstration or maintenance plan consistent with the requirements of Subsection D of 20.2.79.115 NMAC.

(d) For a regulated new source review pollutant, when a project involves multiple emissions units, only one consecutive 24-month period must be used to determine the baseline actual emissions for the emissions units being changed. A different consecutive 24-month period can be used for each regulated new source review pollutant.

(e) The average rate shall not be based on any consecutive 24-month period for which there is inadequate information for determining annual emissions, in tons per year, and for adjusting this amount if required by Subparagraphs (b) and (c) of Paragraph (2) of this subsection.

(3) For a new emissions unit, the baseline actual emissions for purposes of determining the emissions increase that will result from the initial construction and operation of such unit shall equal zero; and thereafter, for all other purposes, shall equal the unit's potential to emit.

(4) For a plantwide applicability limit for a major stationary source, the baseline actual emissions shall be calculated for existing electric utility steam generating units in accordance with the procedures contained in Paragraph (1) of this subsection, for other existing emissions units in accordance with the procedures contained in Paragraph (2) of this subsection, and for a new emissions unit in accordance with the procedures contained in Paragraph (3) of this subsection.

F."Begin actual construction" means in general, initiation of physical on-site construction activities on an emissions unit which are of a permanent nature. Such activities include, but are not limited to, installation of building support and foundations, laying of underground pipework, and construction of permanent storage structures. With respect to a change in method of operating this term refers to those on-site activities other than preparatory activities which mark the initiation of the change.

G."Best available control technology (BACT)" means an emissions limitation (including a visible emissions standard) based on the maximum degree of reduction for each regulated new source review pollutant which would be emitted from any proposed major stationary source or major modification which the department, on a case-by-case basis, taking into account energy, environmental, and economic impacts and other costs, determines is achievable for such source or modification through application of production processes or available methods, systems, and techniques, including fuel cleaning, clean fuels, or treatment or innovative fuel combustion techniques for control of such pollutant. In no event shall application of best available control technology result in emissions of any pollutant which would exceed the emissions allowed by any applicable standard under 40 CFR Part 60 or 61. If the department determines that technological or economic limitations on the application of measurement methodology to a particular emissions unit would make the imposition of an emissions standard infeasible, a design, equipment, work practice, operational standard, or combination thereof, may be prescribed instead to satisfy the requirement for the application of BACT. Such standard shall, to the degree possible, set forth the emissions reduction achievable by implementation of such design, equipment, work practice or operation, and shall provide for compliance by means which achieve equivalent results.

H."Building, structure, facility, or installation" means all of the pollutant-emitting activities which belong to the same industrial grouping, are located on one or more contiguous or adjacent properties, and are under the control of the same person (or persons under common control). Pollutant-emitting activities shall be considered as part of the same industrial grouping if they belong to the same "major group" (i.e., which have the same two-digit code) as described in the standard industrial classification manual, 1972, as amended by the 1977 supplement (U.S. government printing office stock numbers 4101-0066 and 003-005-00176-0, respectively).

I."Commence" as applied to construction of a major stationary source or major modification means that the owner or operator has all necessary preconstruction approvals or permits and either has:

(1) begun, or caused to begin, a continuous program of actual on-site construction of the source, to be completed within a reasonable time; or

(2) entered into binding agreements or contractual obligations, which cannot be cancelled or modified without substantial loss to the owner or operator, to undertake a program of actual construction of the source to be completed within a reasonable time.

J."Construction" means any physical change or change in the method of operation (including fabrication, erection, installation, demolition, or modification of an emissions unit) which would result in a change in actual emissions.

K."Continuous emissions monitoring system" (CEMS) means all of the equipment that may be required to meet the data acquisition and availability requirements of this section, to sample, condition (if applicable), analyze, and provide a record of emissions on a continuous basis.

L."Continuous emissions rate monitoring system" (CERMS) means the total equipment required for the determination and recording of the pollutant mass emissions rate (in terms of mass per unit of time).

M."Continuous parameter monitoring system" (CPMS) means all of the equipment necessary to meet the data acquisition and availability requirements of this section, to monitor process and control device operational parameters (for example, control device secondary voltages and electric currents) and other information (for example, gas flow rate, oxygen or carbon dioxide concentrations), and to record average operational parameter value(s) on a continuous basis.

N."Electric utility steam generating unit" means any steam electric generating unit that is constructed for the purpose of supplying more than one-third of its potential electric output capacity and more than 25 megawatts electrical output to any utility power distribution system for sale. Any steam supplied to a steam distribution system for the purpose of providing steam to a steam-electric generator that would produce electrical energy for sale is also considered in determining the electrical energy output capacity of the affected facility.

O."Emissions unit" means any part of a stationary source that emits or would have the potential to emit any regulated new source review pollutant and includes an electric steam generating unit as defined in Subsection N of this section. For purposes of this section, there are two types of emissions units.

(1) A new emissions unit is any emissions unit which is (or will be) newly constructed and which has existed for less than two years from the date such emissions unit first operated.

(2) An existing emissions unit is any emissions unit that does not meet the requirements in Paragraph (1) of this subsection. A replacement unit, as defined in this section, is an existing unit.

P."Federal class I area" means any Federal land that is classified or reclassified "class I".

Q."Federal land manager" means, with respect to any lands in the United States, the secretary of the department with authority over such lands.

R."Federally enforceable" means all limitations and conditions which are enforceable by the administrator, including those requirements developed pursuant to 40 CFR Parts 60 and 61, requirements within any applicable state implementation plan, any permit requirements established pursuant to 40 CFR 52.21 or under regulations approved pursuant to 40 CFR Part 51, Subpart I including 40 CFR 51.165 and 40 CFR 51.166.

S."Fugitive emissions" means those emissions which could not reasonably pass through a stack, chimney, vent, or other functionally equivalent opening.

T."Lowest achievable emission rate" means, for any source, the more stringent rate of emissions based on the following:

(1) the most stringent emissions limitation which is contained in the implementation plan of any state for such class or category of stationary source, unless the owner or operator of the proposed stationary source demonstrates that such limitations are not achievable; or

(2) the most stringent emissions limitation which is achieved in practice by such class or category of stationary source; this limitation, when applied to a modification, means the lowest achievable emissions rate for the new or modified emissions units within the stationary source; in no event shall the application of this term permit a proposed new or modified stationary source to emit any pollutant in excess of the amount allowable under an applicable new source standard of performance.

U."Major modification" means any physical change in or change in the method of operation of a major stationary source that would result in a significant emissions increase of a regulated new source review pollutant (as defined in this section); and a significant net emissions increase of that pollutant from the major stationary source. Any significant emissions increase (as defined in this section) from any emissions units or net emissions increase (as defined in this section) at a major stationary source that is significant for volatile organic compounds or oxides of nitrogen shall be considered significant for ozone.

(1) A physical change or change in the method of operation shall not include:

(a) routine maintenance, repair, and replacement;

(b) use of an alternative fuel or raw material by reason of an order under Section 2 (a) and (b) of the Energy Supply and Environmental Coordination Act of 1974 (or any superseding legislation) or by reason of a natural gas curtailment plan pursuant to the federal Power Act;

(c) use of an alternative fuel by reason of an order or rule under Section 125 of the federal Clean Air Act;

(d) use of an alternative fuel at a steam generating unit to the extent that the fuel is generated from municipal solid waste;

(e) use of an alternative fuel or raw material by a stationary source which:

(i) the source was capable of accommodating before December 21, 1976, unless such change would be prohibited under any federally enforceable permit condition which was established after December 21, 1976 pursuant to 40 CFR 52.21 or under regulations approved pursuant to 40 CFR 51.165 or 40 CFR 51.166; or

(ii) the source is approved to use under any permit issued under 40 CFR 52.21 or under regulations approved pursuant to 40 CFR 51.166;

(f) an increase in the hours of operation or in the production rate, unless such change would be prohibited under any federally enforceable permit which was established after December 21, 1976, pursuant to 40 CFR 52.21 or under regulations approved pursuant to 40 CFR 51.165 or 40 CFR 51.166;

(g) any change in ownership at a stationary source; or

(h) the installation, operation, cessation, or removal of a temporary clean coal technology demonstration project, provided that the project complies with the state implementation plan for the state in which is project is located, and other requirements necessary to attain and maintain the national ambient air quality standards during the project and after it is terminated.

(2) This definition shall not apply with respect to a particular regulated new source review pollutant when the major stationary source is complying with the requirements under 20.2.79.120 NMAC for a plantwide applicability limit for that pollutant. Instead, the definition at Paragraph (8) of Subsection B of 20.2.79.120 NMAC shall apply.

(3) For the purpose of applying the requirements of Subsection H of 20.2.79.109 NMAC to modifications at major stationary sources of nitrogen oxides located in ozone nonattainment areas or in ozone transport regions, whether or not subject to subpart 2, part D, title I of the federal Clean Air Act, any significant net emissions increase of nitrogen oxides is considered significant for ozone.

(4) Any physical change in, or change in the method of operation of a major stationary source of volatile organic compounds that results in any increase in emissions of volatile organic compounds from any discrete operation, emissions unit, or other pollutant emitting activity at the source shall be considered a significant net emissions increase and a major modification for ozone, if the major stationary source is located in an extreme ozone nonattainment area that is subject to subpart 2, part D, title I of the federal Clean Air Act.

V."Major stationary source" means the following.

(1) Any stationary source of air pollutants which emits, or has the potential to emit, 100 tons per year or more of any regulated new source review pollutant, except that lower emissions thresholds shall apply in areas subject to subpart 2, subpart 3, or subpart 4 of part D, title I of the federal Clean Air Act, according to Subparagraphs (a) through (f) of Paragraph (1) of Subsection V of 20.2.79.7 NMAC.

(a) 50 tons per year of volatile organic compounds in any serious ozone nonattainment area.

(b) 50 tons per year of volatile organic compounds in an area within an ozone transport region, except for any severe or extreme ozone nonattainment area.

(c) 25 tons per year of volatile organic compounds in any severe ozone nonattainment area.

(d) 10 tons per year of volatile organic compounds in any extreme ozone nonattainment area.

(e) 50 tons per year of carbon monoxide in any serious nonattainment area for carbon monoxide, where stationary sources contribute significantly to carbon monoxide levels in the area (as determined under rules issued by the United States environmental protection agency administrator).

(f) 70 tons per year of PM10 in any serious nonattainment area for PM10.

(2) For the purposes of applying the requirements of Subsection H of 20.2.79.109 NMAC to stationary sources of nitrogen oxides located in an ozone nonattainment area or in an ozone transport region, any stationary source which emits, or has the potential to emit, 100 tons per year or more of nitrogen oxides emissions, except that the emission thresholds in Subparagraphs (a) through (f) of Paragraph (1) of Subsection V of 20.2.79.7 NMAC shall apply in areas subject to subpart 2 of part D, title I of the federal Clean Air Act.

(a) 100 tons per year or more of nitrogen oxides in any ozone nonattainment area classified as marginal or moderate.

(b) 100 tons per year or more of nitrogen oxides in any ozone nonattainment area classified as a transitional, submarginal, or incomplete or no data area, when such area is located in an ozone transport region.

(c) 100 tons per year or more of nitrogen oxides in any area designated under section 107(D) if the federal Clean Air Act as attainment or unclassifiable for ozone that is located in an ozone transport region.

(d) 50 tons per year or more of nitrogen oxides in any serious nonattainment area for ozone.

(e) 25 tons per year or more of nitrogen oxides in any severe nonattainment area for ozone.

(f) 10 tons per year or more of nitrogen oxides in any extreme nonattainment area for ozone; or

(3) Any physical change that would occur at a stationary source not qualifying under Paragraph (1) or (2) of this definition as a major stationary source, if the change would constitute a major stationary source by itself.

(4) A major stationary source that is major for volatile organic compounds or oxides of nitrogen shall be considered major for ozone.

(5) A stationary source shall not be a major stationary source due to fugitive emissions, to the extent they are quantifiable, unless the source belongs to:

(a) any category in Subsection B of 20.2.79.119 NMAC; or

(b) any other stationary source category which as of August 7, 1980 is being regulated under Section 111 or 112 of the federal Clean Air Act.

(6) A stationary source shall not be a major stationary source due to secondary emissions.

W."Mandatory federal class I area" means those federal lands that are international parks, national wilderness areas which exceed five thousand (5,000) acres in size, national memorial parks which exceed five thousand (5,000) acres in size, and national parks which exceed six thousand (6,000) acres in size, and which were in existence on August 7, 1977. These areas may not be redesignated.

X."Natural conditions" includes naturally occurring phenomena that reduce visibility as measured in terms of visual range, contrast or coloration.

Y."Necessary preconstruction approvals or permits" means those permits or approvals required under federal air quality control laws and regulations and those air quality control laws and regulations which are part of the applicable state implementation plan.

Z."Net emissions increase"

(1) With respect to any regulated new source review pollutant emitted by a major stationary source, the amount by which the sum of the following exceeds zero:

(a) the increase in emissions from a particular physical change or change in the method of operation at a stationary source as calculated pursuant to Subsection E of 20.2.79.109 NMAC; and

(b) any other increases and decreases in actual emissions at the major stationary source that are contemporaneous with the particular change and are otherwise creditable; baseline actual emissions for calculating increases and decreases shall be determined as provided in Subsection E of this section, except that Subparagraph (c) of Paragraph (1) and Subparagraph (d) of Paragraph (2) of Subsection E of this section shall not apply.

(2) An increase or decrease in actual emissions is contemporaneous with the increase from the particular change only if it occurs within the time period five years prior to the commencement of construction on the particular change and the date that the increase from the particular change occurs.

(3) An increase or decrease in actual emissions is creditable only if:

(a) it occurs within the time period five years prior to the commencement of construction on the particular change and the date that the increase from the particular change occurs; and

(b) either the department or the administrator has not relied on it in issuing a permit for the source under regulations approved pursuant to this section, which permit is in effect when the increase in actual emissions from the particular change occurs.

(4) An increase in actual emissions is creditable only to the extent that the new level of actual emissions exceeds the old level.

(5) A decrease in actual emissions is creditable only to the extent that:

(a) the old level of actual emissions or the old level of allowable emissions whichever is lower, exceeds the new level of actual emissions;

(b) it is enforceable as a practical matter at and after the time that actual construction on the particular change begins;

(c) the department has not relied on it in issuing any permit under regulations approved pursuant to 40 CFR Part 51 Subpart I or the state has not relied on it in demonstrating attainment or reasonable further progress; and

(d) it has approximately the same qualitative significance for public health and welfare as that attributed to the increase from the particular change.

(6) An increase that results from a physical change at a source occurs when the emissions unit on which construction occurred becomes operational and begins to emit a particular pollutant. Any replacement unit that requires shakedown becomes operational only after a reasonable shakedown period, not to exceed 180 days.

(7) Paragraph (1) of Subsection A of this section shall not apply for determining creditable increases and decreases or after a change.

AA."Nonattainment area" means, for any air pollutant an area which is designated "nonattainment" with respect to that pollutant within the meaning of Section 107(d) of the federal Clean Air Act.

AB."Nonattainment major new source review (NSR) program" means a major source preconstruction permit program that has been approved by the administrator and incorporated into the New Mexico state implementation plan to implement the requirements of 40 CFR 51.165, or a program that implements 40 CFR Part 51, Appendix S, Sections I through VI. Any permit issued under such a program is a major new source review permit.

AC."Part" means an air quality control regulation under Title 20, Chapter 2 of the New Mexico Administrative Code, unless otherwise noted; as adopted or amended by the board.

AD."Portable stationary source" means a source which can be relocated to another operating site with limited dismantling and reassembly.

AE."Potential to emit" means the maximum capacity of a stationary source to emit a pollutant under its physical and operational design. Any physical or operational limitation on the capacity of the source to emit a pollutant, including air pollution control equipment and restrictions on hours of operation or on the type or amount of material combusted, stored, or processed, shall be treated as part of its design only if the limitation or the effect it would have on emissions is federally enforceable. Secondary emissions do not count in determining the PTE of a stationary source.

AF."Predictive emissions monitoring system"(PEMS) means all of the equipment necessary to monitor process and control device operational parameters (for example, control device secondary voltages and electric currents) and other information (for example, gas flow rate, oxygen or carbon dioxide concentrations), and calculate and record the mass emissions rate (for example, pounds per hour) on a continuous basis.

AG."Prevention of significant deterioration (PSD) permit" means any permit that is issued under 20.2.74 NMAC.

AH."Project" means a physical change in, or change in the method of operation of, an existing major stationary source.

AI."Projected actual emissions" means, the maximum annual rate, in tons per year, at which an existing emissions unit is projected to emit a regulated new source review pollutant in any one of the five years (12-month period) following the date the unit resumes regular operation after the project, or in any one of the 10 years following that date, if the project involves increasing the emissions unit's design capacity or its potential to emit of that regulated new source review pollutant and full utilization of the unit would result in a significant emissions increase or a significant net emissions increase at the major stationary source. In determining the projected actual emissions before beginning actual construction, the owner or operator of the major stationary source:

(1) shall consider all relevant information, including but not limited to, historical operational data, the company's own representations, the company's expected business activity and the company's highest projections of business activity, the company's filings with the state or federal regulatory authorities, and compliance plans under the approved plan; and

(2) shall include fugitive emissions to the extent quantifiable, and emissions associated with startups, shutdowns, and malfunctions; and

(3) shall exclude, in calculating any increase in emissions that results from the particular project, that portion of the unit's emissions following the project that an existing unit could have accommodated during the consecutive 24-month period used to establish the baseline actual emissions under Subsection E of this section and that are also unrelated to the particular project, including any increased utilization due to product demand growth; or,

(4) in lieu of using the method set out in Paragraphs (1) through (3) of this subsection, may elect to use the emissions unit's potential to emit, in tons per year, as defined under Subsection AE of this section.

AJ."Regulated new source review pollutant", for purposes of this section, means the following:

(1) nitrogen oxides or any volatile organic compounds;

(2) any pollutant for which a national ambient air quality standard has been promulgated;

(3) any pollutant that is identified under this paragraph (Paragraph (3) of Subsection AJ of 20.2.79.7 NMAC) as a constituent or precursor of a general pollutant listed in Paragraphs (1) or (2) of this subsection, provided that such constituent or precursor pollutant may only be regulated under new source review as part of regulation of the general pollutant; precursors identified by the administrator for purposes of NSR are the following:

(a) volatile organic compounds and nitrogen oxides are precursors to ozone in all ozone nonattainment areas;

(b) sulfur dioxide is a precursor to PM_2.5in all PM_2.5nonattainment areas;

(c) nitrogen oxides are presumed to be precursors to PM_2.5in all PM_2.5nonattainment areas, unless the state demonstrates to the administrator's satisfaction or EPA demonstrates that emissions of nitrogen oxides from sources in a specific area are not a significant contributor to that area's ambient PM_2.5 concentrations;

(d) volatile organic compounds and ammonia are presumed not to be precursors to PM_2.5in any PM_2.5nonattainment area, unless the state demonstrates to the administrator's satisfaction or EPA demonstrates that emissions of volatile organic compounds or ammonia from sources in a specific area are a significant contributor to that area's ambient PM_2.5 concentrations; or

(4) PM_2.5 emissions and PM₁₀ emissions shall include gaseous emissions from a source or activity which condense to form particulate matter at ambient temperatures; on or after January 1, 2011, such condensable particulate matter shall be accounted for in applicability determinations and in establishing emissions limitations for PM_2.5 and PM₁₀ in nonattainment major NSR permits; compliance with emissions limitations for PM_2.5 and PM₁₀ issued prior to this date shall not be based on condensable particulate matter unless required by the terms and conditions of the permit or the applicable implementation plan; applicability determinations made prior to this date without accounting for condensable particulate matter shall not be considered in violation of this section unless the applicable implementation plan required condensable particulate matter to be included.

AK."Replacement unit" means an emission unit for which all of the following criteria are met. No creditable emission reductions shall be generated from shutting down the existing emissions unit that is replaced.

(1) The emissions unit is a reconstructed unit within the meaning of 40 CFR 60.15(b)(1), or the emissions unit completely takes the place of an existing emissions unit.

(2) The emissions unit is identical to or functionally equivalent to the replaced emissions unit.

(3) The replacement unit does not change the basic design parameter(s) of the process unit.

(4) The replaced emissions unit is permanently removed from the major stationary source, otherwise permanently disabled, or permanently barred from operation by a permit that is enforceable as a practical matter. If the replaced emissions unit is brought back into operation, it shall constitute a new emissions unit.

AL."Secondary emissions" means emissions which would occur as a result of the construction or operation of a major stationary source or major modification, but do not come from the major stationary source or major modification itself. For the purpose of this section, secondary emissions must be specific, well defined, quantifiable, and impact the same general area as the stationary source or modification which causes the secondary emissions. Secondary emissions include emissions from any offsite support facility which would not be constructed or increase its emissions except as a result of the construction or operation of the major stationary source or major modification. Secondary emissions do not include any emissions which come directly from a mobile source, such as emissions from the tailpipe of a motor vehicle, from a train, or from a vessel.

AM."Significant" means:

(1) In reference to a net emissions increase or the potential of a source to emit any of the following pollutants, a rate of emissions that would equal or exceed any of the following rates: carbon monoxide, 100 tons per year; nitrogen oxides, 40 tons per year; sulfur dioxide, 40 tons per year; PM₁₀ emissions, 15 tons per year; ozone, 40 tons per year of volatile organic compounds or nitrogen oxides; lead, 0.6 tons per year, PM_2.5: 10 tpy of direct PM_2.5 emissions; 40 tpy of sulfur dioxide emissions; 40 tpy of nitrogen oxide emissions unless demonstrated not to be a PM_2.5 precursor under Subsection AJ of 20.2.79.7 NMAC.

(2) Notwithstanding the significant emissions rate for ozone in Paragraph (1) of Subsection AM of 20.2.79.7 NMAC, significant means, in reference to an emissions increase or a net emissions increase, any increase in actual emissions of volatile organic compounds that would result from any physical change in, or change in the method of operation of, a major stationary source locating in a serious or severe ozone nonattainment area that is subject to subpart 2, part D, title I of the federal Clean Air Act, if such emissions increase of volatile organic compounds exceeds 25 tons per year.

(3) For the purposes of applying the requirements of Subsection H of 20.2.79.109 NMAC to modifications at major stationary sources of nitrogen oxides located in an ozone nonattainment area or in an ozone transport region, the significant emission rates and other requirements for volatile organic compounds in Paragraphs (1), (2), and (5) of Subsection AM of 20.2.79.7 NMAC shall apply to nitrogen oxides emissions.

(4) Notwithstanding the significant emissions rate for carbon monoxide under Paragraph (1) of Subsection AM of 20.2.79.7 NMAC significant means, in reference to an emissions increase or a net emissions increase, any increase in actual emissions of carbon monoxide that would result from any physical change in, or change in the method of operation of, a major stationary source in a serious nonattainment area for carbon monoxide if such increase equals or exceeds 50 tons per year, provided the U.S. environmental protection agency administrator has determined that stationary sources contribute significantly to carbon monoxide levels in that area.

(5) Notwithstanding the significant emissions rates for ozone under Paragraphs (1) and (2) of Subsection AM of 20.2.79.7 NMAC, any increase in actual emissions of volatile organic compounds from any emissions unit at a major stationary source of volatile organic compounds located in an extreme ozone nonattainment area that is subject to subpart 2, part D, title I of the federal Clean Air Act shall be considered a significant net emissions increase.

AN."Significant emissions increase" means, for a regulated new source review pollutant, an increase in emissions that is significant (as defined in Subsection AM of this Section) for that pollutant.

AO."Stationary source" means any building, structure, facility, or installation which emits or may emit any regulated new source review pollutant.

AP."Temporary source" means a stationary source which changes its location or ceases to exist within one year from the date of initial start of operations.

AQ."Visibility impairment" means any humanly perceptible change in visibility (visual range, contrast, coloration) from that which would have existed under natural conditions.

N.M. Admin. Code § 20.2.79.7

11/30/95; 20.2.79.7 NMAC - Rn, 20 NMAC 2.79.107, 10/31/02; A, 1/22/06; A, 08/31/09; A, 6/3/11, Amended by New Mexico Register, Volume XXXII, Issue 15, August 10, 2021, eff. 8/21/2021