MOJAQMD RULE 1301 DEFINITIONS

LAST REVISED 03/25/96

RULE 1301 

DEFINITIONS

(Adopted: 7/21/80; Amended: 10/27/93; Amended: 03/25/96) 

For the purposes of this Regulation, the following definitions shall apply: 

(A) "Actual Emissions" - The actual rate of emissions of a Regulated Air Pollutant which accurately 

represent the emissions from an Emissions Unit. Such emissions shall be calculated using the verified 

actual operating hours; production rates; and types of materials processed, stored or combusted as 

applicable. 

(B) "Actual Emissions Reductions (AERs)" - Emissions reductions which result from modifications to 

or shutdowns of existing Emissions Unit(s) which have been banked pursuant to District Regulation 

XIV or which are simultaneous reductions within the same Facility as calculated pursuant to District 

Rule 1305(B)(2). AERs shall be real, enforceable, quantifiable, surplus and permanent and shall be 

calculated pursuant to provisions of District Rules 1305(B)(2) or 1404(A) as applicable. 

(C) "Affected State" - Any State or local air pollution control agency whose air quality may be affected 

by the granting of a permit to a Facility or an Emissions Unit and which is contiguous to the District; or 

any State which is located within 50 miles of the Facility. 

(D) "Air Pollutant" - Any air pollution agent or combination of such agents, including any physical, 

chemical, biological, or radioactive (including source material, special nuclear material and byproduct 

material) substance or matter which is emitted into or otherwise enters the ambient air. 

(E) "Air Pollution Control Officer" (APCO) - The person appointed to the position of Air Pollution 

Control Officer of the District pursuant to the provisions of California Health & Safety Code §40750, 

and his or her designee. 

(F) "Ambient Air Quality Standards" - Any National Ambient Air Quality Standard promulgated 

pursuant to the provisions of 42 U.S.C. §7409 (Federal Clean Air Act §109) or any State Ambient Air 

Quality Standard promulgated to California Health & Safety Code §39606 unless the particular Ambient 

Air Quality Standard (either National or State) is specified. 

(G) "Application for Certification" (AFC) - A document submitted to the CEC requesting 

certification of an EEGF pursuant to the provisions of Division 15 of the California Public Resources 

Code (commencing with section 25000). 

(H) "Authority to Construct Permit" (ATC) - A District permit required pursuant to the provisions of 

District Rule 201 which must be obtained prior to the building, erecting, installation, alteration or 

replacement of any Permit Unit. Such permit may act as a temporary PTO pursuant to the provisions of 

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District Rule 202. 

(I) "Begin Actual Construction" - The general initiation of physical on-site construction activities on 

an Emissions Unit which are of a permanent nature. Actual construction activities include, but are not 

limited to, the following: 

1. Installation of building supports and foundations; 

2. Laying of underground pipe work; 

3. Construction of permanent storage structures; and 

4. With respect to a change in operating method, those on-site activities, other than preparatory 

activities, which mark the initiation of the change. 

(J) "Best Available Control Technology (BACT)" - For any Permit Unit, the most stringent of: 

1. The most effective emission control device, emission limit, or technique which has been achieved 

in practice, for such permit unit category or class of source; or any other emission control device, 

process or technique, and/or different fuel demonstrated in practice to be technologically feasible 

and cost-effective by the APCO or by CARB. 

2. Under no circumstances shall BACT be determined to be less stringent than the emission control 

required by any applicable provision of laws or regulations of the District, State, and/or Federal 

government, unless the applicant demonstrates to the satisfaction of the APCO that such 

limitations are not achievable. 

3. In no event shall the application of BACT result in the emissions of any Regulated Air Pollutant 

which exceeds the emissions allowed by any applicable standard or other requirement under 42 

U.S.C. §7411, Standards of Performance for New Stationary Sources (Federal Clean Air Act 

§111) or 42 U.S.C. §7412, Hazardous Air Pollutants (Federal Clean Air Act §112) or the 

regulations promulgated thereunder. 

4. BACT for Emission Unit categories or classes of Facilities shall be determined on a case-by-case 

basis. 

(K) "California Air Resources Board" (CARB) - The California State Air Resources Board the 

powers and duties of which are described in Part 2 of Division 26 of the California Health & Safety 

Code (commencing with section 39500). 

(L) "California Energy Commission" (CEC) - The California Energy Commission the powers and 

duties of which are described in Division 15 of the California Public Resources Code (commencing with 

section 25000). 

(M) "Cargo Carriers" - Cargo carriers are trains, trucks and off-road vehicles dedicated to, or an 

integral part of, a specific Facility. For the purposes of this regulation, trucks and off-road vehicles are 

those used exclusively at the Facility. 

(N) "Commence Construction" - When the owner or operator of a Facility or of a Facility undergoing 

a Major Modification has obtained all necessary preconstruction approvals and/or permits and has 

either: 

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1. Begun, or caused to begin, a continuous program of actual on-site construction to be completed 

within a reasonable time; or 

2. Entered into binding agreements or contractual obligations, which cannot be canceled or modified 

without substantial loss to the owner or operator, to undertake a program of actual construction of 

the Facility or Emissions Unit to be completed within a reasonable time. 

(O) "Construction" - Any physical change or change in the method of operation in a Facility 

(including fabrication, erection, installation, demolition, or modification of an Emissions Unit) which 

would result in a change in Actual Emissions. 

(P) "Contiguous Property" - Two or more parcels of land with a common boundary or separated 

solely by a public or private roadway, or other public or private right-of-way. 

(Q) "Control Efficiency" - The estimated control efficiency of a proposed air pollution control device 

or procedures which will be incorporated into the process or onto the Permit Unit. Such equipment or 

other modifications shall be recorded on the ATC(s) and/or PTO(s) as a Federally Enforceable permit 

condition. Emissions reductions attributed to reduced throughput rates or operating hours shall not be 

considered in determining control efficiency. 

(R) "Daily Emissions Limitation" - One or a combination of Federally Enforceable permit conditions 

specific to a permit unit which restricts its maximum daily emissions, in pounds per day, at or below the 

emissions associated with the maximum design capacity. A daily emissions limitation must be contained 

in the latest Authority to Construct/Permit to Operate for the permit unit. 

(S) "District" - The Mojave Desert Air Quality Management District the geographical area of which is 

described in District Rule 103. 

(T) "Electrical Energy Generating Facility" (EEGF) - Any stationary or floating electrical generating 

facility using any source of thermal energy, with a generating capacity of 50 megawatts or more, and 

any facilities appurtenant thereto. 

1. Exploratory, development, and production wells, resource transmission lines and other related 

facilities used in connection with a geothermal exploratory project or a geothermal field 

development project are not appurtenant facilities for the purposes of this Regulation. 

2. EEGF does not include any wind, hydroelectric or solar photovoltaic electrical generating facility. 

(U) "Emissions Reduction Credit" (ERC) - A credit for an amount and type of Regulated Air 

Pollutant granted by the District pursuant to the provisions of District Regulation XIV which is 

evidenced by recordation in the Registry of emissions reductions and by an ERC Certificate. 

(V) "Emissions Unit" - any part of a Facility which emits or has the Potential to Emit any Regulated 

Air Pollutant. 

(W) "Executive Officer" - The person appointed to the position of Executive Officer of the California 

Air Resources Board pursuant to the provisions of California Health & Safety Code §39515 and his or 

her designee. 

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(X) "Facility" - Any building, structure, Emissions Unit, combination of Emissions Units, or 

installation which emits or may emit a Regulated Air Pollutant and which are: 

1. Located on one or more Contiguous or adjacent properties within the District; 

2. Under the control of the same person (or by persons under common control); and 

3. Belong to the same industrial grouping, as determined by being within the same two digit 

Standard Industrial Classification Code (SICC). 

4. For the purpose of this regulation, such above-described grouping, remotely located but connected 

only by land carrying a pipeline, shall not be considered one Facility. 

(Y) "Federally Enforceable" - any limitation and/or condition which is enforceable by USEPA 

including, but not limited to: 

1. Requirements developed pursuant to 42 U.S.C. §7411, Standards of Performance for New 

Stationary Sources (Federal Clean Air Act §111) or 42 U.S.C. §7412, Hazardous Air Pollutants 

(Federal Clean Air Act §112) or the regulations promulgated thereunder; 

2. Requirements within any applicable state implementation plan; 

3. Permit requirements established pursuant to 40 CFR 52.21; 51.160-166; or under regulations 

approved pursuant to 40 CFR 51, subpart I, including operating permits issued under a USEPA 

approved program that is incorporated into the State Implementation Plan and expressly requires 

adherence to any permit issued under such program. 

(Z) "Fugitive Emissions" - Those emissions which could not reasonably pass through a stack, chimney, 

or vent. Fugitive emissions are directly or indirectly caused by the activities of man. 

(AA) "Halocarbons" - For the purpose of this rule, halocarbons are 1,1,1-trichloroethane, 

trichlorofluoromethane (CFC-11), dichlorodifluoromethane (CFC-12), chlorodifluoromethane (CFC22), trifluoromethane (CFC-23), methylene chloride, trichlorotrifluoroethane (CFC-113), 

dichlorotetrafluoroethane (CFC-114), and chloropentafluoroethane (CFC-115). 

(BB) "Historic Actual Emissions" (HAE) - The Actual Emissions of an Emissions Unit or 

combination of Emissions Units, including Fugitive Emissions directly related to the Emissions Unit(s), 

calculated in pounds per year and determined pursuant to the provisions of District Rule 1304(D)(2). 

(CC) "Historic Potential Emissions" (HPE) - The Potential to Emit of an existing Emissions Unit or 

combination of Emission Units, prior to Modification, calculated in pounds per year and determined 

pursuant to the provisions of District Rule 1304(D)(3). 

(DD) "Major Facility" - Any Facility which emits or has the Potential to Emit any Regulated Air 

Pollutant or its Precursors in an amount greater than or equal to the amounts set forth in District Rule 

1303(B)(1). 

1. Any physical change at a Facility which, by itself, would emit or have the Potential to Emit any 

Regulated Air Pollutant or its Precursors in an amount greater than or equal to the amounts listed 

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in District Rule 1303(B), shall also constitute a Major Facility. 

2. The Fugitive Emissions of a Facility shall not be included in the determination of whether a 

Facility is a Major Facility unless the Facility belongs to one of the twenty-seven (27) categories 

of Facilities as listed in 40 CFR 51.165(a)(1)(iv)(C). 

(EE) "Major Modification" - Any Modification in a Facility that would result in a Significant Net 

Emissions Increase of any Regulated Air Pollutant as set forth in section (EEE) below. 

(FF) "Mobile Source" - A device by which any person or property may be propelled, moved, or drawn 

upon the surface, waterways, or through the atmosphere, and which emits air contaminants. For the 

purpose of this Regulation, mobile source includes registered Motor Vehicles which are licensed, or 

driven on the public roadways of the state of California. 

(GG) "Modeling" - An air quality simulation model based on specific assumptions and data, and which 

model, assumptions, and data have been approved in advance and in writing by the APCO. Such models

shall be from a list of approved air quality simulation models prepared by the CARB and the USEPA. 

(HH) "Modification" - Any physical or operational change to a Facility or an Emissions Unit to replace

equipment, expand capacity, significantly revise methods of operation, or modernize processes by 

making any physical change, change in method of operation, addition to an existing Permit Unit and/or 

change in hours of operation which results in a Net Emissions Increase of any Regulated Air Pollutant or 

which results in the emission of any Regulated Air Pollutant not previously emitted: 

1. A physical or operational change shall not include: 

(a) Routine maintenance, repair and/or replacement; or 

(b) A change in ownership of an existing Facility with valid PTO(s); or 

(c) The replacement or Modification of an Emissions Unit where the following requirements are 

met: 

(i) The replacement unit is functionally identical as the Emissions Unit being replaced; and 

(ii) The maximum rating of the new or modified Emissions Unit will not be greater than that 

of the Emissions Unit being replaced; and 

(iii) The Potential to Emit for any Regulated Air Pollutant will not be greater from the new 

or modified Emissions Unit than from the Emissions Unit being replaced when the 

replacement Emissions Unit is operated at the same permitted conditions as the original 

Emissions Unit and as if current BACT had been applied to the original Emissions Unit; 

and 

(iv) The replacement does not occur at a Major Facility and is not a Major Modification. 

(v) An Emissions Unit shall not be considered a functionally identical replacement if 

USEPA objects to such determination on a case-by-case basis. 

(d) The relocation of an existing Facility, utilizing existing equipment where the following 

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requirements are met: 

(i) The relocation does not result in an increase in emissions from the Facility; and 

(ii) The relocation is to a site within 10 miles of the original Facility location; and 

(iii) The relocation is to a site within a federal designation which is less than or equal to the 

designation or classification of the original site; and 

(iv) The relocation occurs within one (1) year of the Facility ceasing operations at its 

original location; and 

(v) The relocation does not occur at a Major Facility and is not a Major Modification; and 

(vi) Any new or replacement equipment associated with the relocation complies with the 

applicable provisions of this Rule. 

(II) "Motor Vehicle" - For the purpose of this regulation, "Motor Vehicle" includes registered Motor 

Vehicles which are licensed, or driven on the public roadways of the state of California. 

(JJ) "Net Air Quality Benefit" - Any improvement in air quality resulting from Actual Emission 

Reductions. 

(KK) "Net Emissions Increase" - An emissions change as calculated pursuant to District Rule 1304(B) 

which exceeds zero. 

(LL) "New Source Review Document" (NSR Document) - A document issued by the APCO pursuant 

to the procedures of District Rule 1302 for a Facility subject to the provisions of District Rule 1303(B) 

which includes, but is not limited to, all analysis relating to the project, Offsets required for the project, 

and proposed conditions for any required ATC(s) or PTO(s). 

(MM) "Nonattainment Air Pollutant" - Any Regulated Air Pollutant for which the District has been 

designated "nonattainment" pursuant to final rule-making by the USEPA as published in the Federal 

Register, or for which the District has been designated nonattainment by the CARB pursuant to 

California Health and Safety Code §39607. Any pollutant which is a Precursor to a Nonattainment Air 

Pollutant is also a Nonattainment Air Pollutant. 

(NN) "Nonpermitted Exempt Unit" - An Emissions Unit or group of Emissions Units which are 

exempt from the requirement to have a permit pursuant to the provisions of District Rule 219 or the 

provisions of California Health & Safety Code §42310. 

(OO) "Normal Operation" - The usual or typical daily operations of a Facility or Emissions Unit. 

(PP) "Notice of Intention" (NOI) - A notice regarding an EEGF produced pursuant to the provisions of 

Division 15 of the California Public Resources Code (commencing with section 25000). 

(QQ) "Off-road Vehicle" - Any vehicle which is not licensed for use on the public roadways in the 

State of California and is used exclusively at the Facility. 

(RR) "Offset Emission Reductions" (Offsets) - Actual Emissions Reductions (AERs) or Emission 

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Reduction Credits (ERCs) used to offset emission increases of Regulated Air Pollutants on a pollutant 

category specific basis. AERs shall be calculated pursuant to the criteria set forth in District Ruled 1304

(C). ERCs shall comply with the provisions of District Regulation XIV. AERs or ERCs shall be 

adjusted, if necessary, pursuant to the provisions of District Rule 1305(C)(5). 

(SS) "Permit to Operate" (PTO) - A District permit required pursuant to the provisions of District 

Rule 203 which must be obtained prior to operation of a Permit Unit. An ATC may function as a 

temporary PTO pursuant to the provisions of District Rule 202. 

(TT) "Permit Unit" - Any Emissions Unit which is required to have a PTO pursuant to the provisions 

of District Rule 203. 

(UU) "PM10" - Particulate matter with an aerodynamic diameter less than or equal to a nominal 10 

micrometers as measured by a reference method based on 40 CFR 50 Appendix J and designated in 

accordance with 40 CFR 53; or methods found in Article 2, Subchapter 6, Title 17, California Code of 

Regulations (commencing with section 94100); or any equivalent method designated in accordance with 

40 CFR 53. 

(VV) "Potential to Emit" (PTE) - The maximum capacity of a Facility or Emissions Unit(s) to emit 

any Regulated Air Pollutant under its physical and operational design. 

1. Any physical or operational limitation on the capacity of the Facility or Emissions Unit(s) to emit 

an Air Pollutant, including air pollution control equipment and restrictions on hours of operation 

or on the type or amount of material combusted, stored, or processes, shall be treated as part of its 

design only if the limitation or the effect it would have on emissions is Federally Enforceable. 

2. Fugitive Emissions of Hazardous Air Pollutants shall be included in the calculation of a Facility's 

or Emission Unit(s)' Potential to Emit. 

3. Fugitive Emissions of other Air Pollutants shall not be included in the calculations of a Facility's 

or Emissions Unit(s)' Potential to Emit unless the Facility belongs to one of the 27 categories 

listed in 40 CFR 51.165(a)(1)(iv)(C). 

4. Secondary Emissions shall not be included in the calculations of a Facility's or Emissions Unit(s)' 

Potential to Emit. 

(WW) "Precursor" - A substance which, when released to the atmosphere, forms or causes to be 

formed or contributes to the formation of a Regulated Air Pollutant. These include, but are not limited to 

the following: 

Precursors Secondary Pollutants

Hydrocarbons and substituted 

hydrocarbons 

(Reactive Organic Compounds)

a) Photochemical oxidant (ozone) 

b) The organic fraction of PM10

Nitrogen Oxides (NOx) a) Nitrogen dioxide (NO2) 

b) The nitrate fraction of PM10 

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(XX) "Proposed Emissions" (PE) - The Potential to Emit for a new or modified Facility or Emissions 

Unit, as constructed or modified, calculated pursuant to the provisions of District Rule 1304(D)(4). 

(YY) "Reactive Organic Compound" (ROC) - Any compound containing carbon, excluding carbon 

monoxide, carbon dioxide, carbonic acid, metallic carbides or carbonates, ammonium carbonates, which 

participates in atmospheric photochemical reactions and those compounds listed in 17 California Code 

of Regulations §94508(a)(90)(1-2). 

(ZZ) "Reasonably Available Control Technology" (RACT) - Any device, system, process 

modification, apparatus, technique or combination of the above which results in the lowest emissions 

rate and which is reasonably available considering technological and economic feasibility. 

(AAA) "Reduced Sulfur Compounds" - Hydrogen sulfide, carbon disulfide and carbonyl sulfide. 

(BBB) "Regulated Air Pollutant" - Any of the following Air Pollutants: 

1. Any Air Pollutant, and its Precursors, for which an Ambient Air Quality Standard has been 

promulgated. 

2. Any Air Pollutant that is subject to a standard under 42 U.S.C. §7411, Standards of Performance 

for New Stationary Sources (Federal Clean Air Act §111) or the regulations promulgated 

thereunder. 

3. Any substance which has been designated a Class I or Class II substance under 42 U.S.C. §7671a 

(Federal Clean Air Act §602) or the regulations promulgated thereunder. 

4. Any Air Pollutant subject to a standard or other requirement established pursuant to 42 U.S.C. 

§7412, Hazardous Air Pollutants (Federal Clean Air Act §112) or the regulations promulgated 

thereunder. 

(CCC) "Seasonal Source" - Any Facility or permit unit with more than seventy-five percent (75%) of 

its annual emissions within a consecutive 120 day period. 

(DDD) "Secondary Emissions" - Emissions which would occur as a result of the Construction or 

operation of a Facility or Major Modification to a Facility but which do not come from the Facility or 

the Major Modification itself. 

1. These emissions must be specific, well defined, quantifiable, and impact the same general area as 

the Facility or the Major Modification which causes the Secondary Emissions. 

c) Photochemical oxidant (ozone)

Sulfur Oxides (SOx) a) Sulfur dioxide (SO2) 

b) Sulfates (SO4) 

c) The sulfate fraction of PM10

Hydrogen Sulfide (H2S) 

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2. Secondary Emissions shall include emissions from any offsite support Facility which would not 

be constructed or increase its emissions except as the result of the construction or operation of the 

Facility or Major Modification. 

3. Secondary Emissions shall not include any emissions which come directly from a Mobile Source. 

(EEE) "Significant" - A Net Emissions Increase from a Major Modification which would be greater 

than or equal to the following emissions rates for those Air Pollutants and their Precursors dependant 

upon Facility location. 

1. If a Facility is located in more than one federal nonattainment area then the lower of the limits 

listed above shall apply on a pollutant category specific basis. 

(FFF) "Simultaneous Emission Reduction" (SER) - A Federally Enforceable reduction in the 

emissions of an existing Emissions Unit, calculated pursuant to the provisions of District Rule 1304(C), 

which occurs at the same time as a permitting action pursuant to this Regulation and is any of the 

following: 

1. A reduction in the Actual Emissions of the Emissions Unit; or 

2. A reduction in the Potential to Emit of the Emissions Unit so long as the HPE of the Emissions 

Unit was completely offset in a prior permitting action pursuant to this Regulation. 

(GGG) "Total Organic Compounds" - Compounds of carbon, excluding carbon monoxide, carbon 

dioxide, carbonic acid, metallic carbides or carbonates and ammonium carbonate. 

POLLUTANT EMISSION RATE 

(Within an 

attainment or 

unclassified area)

EMISSION RATE 

(Within a Severe-17 

ozone 

nonattainment 

area)

EMISSION RATE 

(Within a moderate 

PM10 

nonattainment 

area)

Carbon Monoxide 

(CO)

100 tpy 100 tpy 100 tpy

Lead (Pb) 0.6 tpy 0.6 tpy 0.6 tpy

Oxides of Nitrogen 

(NOx)

40 tpy 25 tpy 40 tpy

PM10 N/A N/A 15 tpy

Reactive Organic 

Compounds (ROC)

40 tpy 25 tpy 40 tpy

Sulfur Dioxide 

(SO2)

40 tpy 40 tpy 40 tpy

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(HHH) "United States Environmental Protection Agency" (USEPA) - The United States 

Environmental Protection Agency, the Administrator of the USEPA and his or her authorized 

representative. 

(III) "Volatile Organic Compounds" (VOC) - Any compound of carbon, excluding carbon monoxide, 

carbon dioxide, carbonic acid, metallic carbides or carbonates, and ammonium carbonate, which 

participates in atmospheric photochemical reactions and those compounds listed in 40 CFR 51.100(s)(1). 

[SIP: Submitted as amended 03/25/96 on _________; Submitted as amended 10/27/93 on 03/29/94; Conditional Approval 47 

FR 25013, 06/09/82] 

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