BUTTE COUNTY AQMD RULES AND REGULATIONS

Rule 101 April 24, 2014 101-1

Rule 101 Definitions 

(Adopted February 23, 1971; Amended September 14, 1971, January 4, 1972, December 12, 1972,

July 15, 1980, August 8, 1982; Recodified August 6, 1985; Amended December 13, 1988, June 6, 1989, 

September 18, 1990, July 7, 1992, January 12, 1993, April 18, 1996, August 20, 1998, April 25, 2002; 

Recodified August 22, 2002; Amended January 22, 2004, June 24, 2010, March 28, 2013, 

April 24, 2014)

RULE 101 CONTENTS

1 PURPOSE

2 APPLICABILITY

3 ACRONYMS

4 DEFINITIONS OF TERMS

5 SEVERABILITY

6 REFERENCES
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Rule 101 April 24, 2014 101-2

RULE 101

1 PURPOSE: The purpose of this Rule is to provide standard terminology to be used 

throughout this Rulebook.

2 APPLICABILITY: The definitions in this Rule shall apply to all terms used within 

this Rulebook. Definitions specific to a given Rule are defined in that Rule or in the 

first Rule in the relevant regulation. Except as specifically provided in these Rules 

where the context otherwise indicates, words used in these Rules are used in 

exactly the same sense as the same words used in Division 26 of the Health and 

Safety Code.

3 ACRONYMS: The following acronyms are common to these definitions and 

Rulebook:

APCO: Air Pollution Control Officer

CARB: California Air Resources Board

CCR: California Code of Regulations

CFR: Code of Federal Regulations

DISTRICT: Butte County Air Quality Management District

EPA: United States Environmental Protection Agency

HSC: California Health and Safety Code

PPMv: Parts per million by volume expressed on a dry gas basis.

4 DEFINITIONS OF TERMS:

4.1 Above Ground Storage Tank: Any storage container, reservoir, or tank 

with less than 10% of the tank and associated piping volume located below 

the ground surface or covered by earthern material.

4.2 Aeration: The exposure of excavated contaminated soil to the atmosphere 

without the use of air pollution control equipment or vapor extraction 

equipment.

4.3 Affected Pollutant: All pollutants (and the precursors to such pollutants) for 

which an ambient air quality standard has been established by EPA or CARB, 

all pollutants regulated by EPA under the Clean Air Act or by CARB under 

the Health and Safety Code, including reactive organic compounds, nitrogen 

oxides, sulfur oxides, PM10, PM2.5, carbon monoxide, total suspended 

particulates, ethylene, lead, asbestos, beryllium, mercury, vinyl chloride,

fluorides, sulfuric acid mist, hydrogen sulfide, total reduced sulfur, and

reduced sulfur compounds. Also, all of the pollutants which EPA, CARB, or

the DISTRICT, after notice and opportunity for public comment and/or public 

hearing, determine may have a significant adverse effect on the environment, 

public health, or the public welfare.

4.4 Agricultural Burning: Burning for the disposal of agricultural vegetative 
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Rule 101 April 24, 2014 101-3

waste pursuant to DISTRICT Rule 300.

4.5 Agricultural Operation: The growing and harvesting of crops, raising of 

fowl or animals for the primary purpose of making a profit, or providing a 

livelihood, or the conducting of agricultural research or instruction by an 

educational institution. Agricultural operations do not include activities 

involving the processing or distribution of crops or fowl or pumping of water 

for distribution outside the District.

4.6 Agricultural Waste: The unwanted or unsalable materials produced wholly 

from agricultural operations and materials not produced from agricultural 

operations, but which are intimately related to the growing or harvesting of 

crops.

4.7 Air Contaminant or Pollutant: Any discharge, release, or other propagation 

into the atmosphere directly, and includes, but is not limited to, smoke, dust, 

charred paper, soot, grime, carbon, noxious acids, greenhouse gases, fumes, 

gases, odors, or particulate matter, or any combination thereof.

4.8 Air Pollution Control Officer (APCO): The person appointed by the 

DISTRICT Board pursuant to HSC Section 40750 to serve as the APCO of 

the Butte County Air Quality Management District and execute the duties 

specified in HSC Section 40752.

4.9 Ambient Air Quality Standards: Health and welfare-based standards set by 

CARB and/or EPA for outdoor air which identify the maximum acceptable 

aveage concentrations of air pollutants during a specific period of time. 

4.10 Atmosphere: The air that envelopes or surrounds the earth. Where air 

pollutants are emitted into a building not designed specifically as a piece of 

air pollution control equipment, such emission into the building shall be 

considered an emission into the atmosphere.

4.11 Backfire: A fire started in the path of an oncoming fire in order to deprive it 

of fuel and therefore control or extinguish it.

4.12 Board: The Governing Board of the Butte County Air Quality Management 

District.

4.13 Burn Day or Permissive Burn Day: Any day, or portion thereof, on which 

allowable burning is not prohibited pursuant to DISTRICT Rule 300.

4.14 Burn Permit or Air Quality Burn Permit: A permit issued by the APCO of 

the DISTRICT that identifies the type(s) and quantity of materials to be 

burned at each location where burning is authorized and specifies conditions 

to be followed for the purpose of improving the combustibility of such waste 

in order to reduce its smoke level.
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4.15 California Air Resources Board (CARB): An organization which is part of 

the California Environmental Protection Agency and reports directly to the 

Governor's Office in the Executive Branch of California State Government 

whose duties include overseeing the activities of the 35 local and regional air 

pollution control and air quality management districts.

4.16 California Clean Air Act (CCAA): California statute signed into law in 

1988 setting California's air quality goals, planning mechanisms, regulatory 

strategies, and standards of progress.

4.17 Carbon Dioxide (CO2) Equivalent (CO2e): The amount of greenhouse 

gases emitted relative to the global warming potential of each pollutant. CO2e 

shall be computed by multiplying the mass amount of emissions (tons per

year) for each greenhouse gas by the gas’s associated global warming 

potential found in Table 4.17 (Global Warming Potentials) and summing the 

resultant values.

Table 4.17—Global Warming Potentials

[100-Year Time Horizon]

Name CAS No. Chemical formula

Global 

warming 

potential

(100 yr.)

Carbon dioxide 124–38–9 CO2 1

Methane 74–82–8 CH4 25

Nitrous oxide 10024–97–2 N2O 298

HFC–23 75–46–7 CHF3 14,800

HFC–32 75–10–5 CH2F2 675

HFC–41 593–53–3 CH3F 92

HFC–125 354–33–6 C2HF5 3,500

HFC–134 359–35–3 C2H2F4 1,100

HFC–134a 811–97–2 CH2FCF3 1,430

HFC–143 430–66–0 C2H3F3 353

HFC–143a 420–46–2 C2H3F3 4,470

HFC–152 624–72–6 CH2FCH2F 53

HFC–152a 75–37–6 CH3CHF2 124

HFC–161 353–36–6 CH3CH2F 12

HFC–227ea 431–89–0 C3HF7 3,200
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Table 4.17—Global Warming Potentials

[100-Year Time Horizon]

Name CAS No. Chemical formula

Global 

warming 

potential

(100 yr.)

HFC–236cb 677–56–5 CH2FCF2CF3 1,340

HFC–236ea 431–63–0 CHF2CHFCF3 1,370

HFC–236fa 690–39–1 C3H2F6 9,810

HFC–245ca 679–86–7 C3H3F5 693

HFC–245fa 460–73–1 CHF2CH2CF3 1,030

HFC–365mfc 406–58–6 CH3CF2CH2CF3 794

HFC–43–10mee 138495–42–8 CF3CFHCFHCF2CF3 1, 640

Sulfur hexafluoride 2551–62–4 SF6 22,800

Trifluoromethyl sulphur 

pentafluoride

373–80–8 SF5CF3 17,700

Nitrogen trifluoride 7783–54–2 NF3 17,200

PFC–14 (Perfluoromethane) 75–73–0 CF4 7,390

PFC–116 (Perfluoroethane) 76–16–4 C2F6 12,200

PFC–218 (Perfluoropropane) 76–19–7 C3F8 8,830

Perfluorocyclopropane 931–91–9 C-C3F6 17,340

PFC–3–1–10 (Perfluorobutane) 355–25–9 C4F10 8,860

Perfluorocyclobutane 115–25–3 C-C4F8 10,300

PFC–4–1–12 (Perfluoropentane) 678–26–2 C5F12 9,160

PFC–5–1–14

(Perfluorohexane)

355–42–0 C6F14 9,300

PFC–9–1–18 306–94–5 C10F18 7,500

HCFE–235da2 (Isoflurane) 26675–46–7 CHF2OCHClCF3 350

HFE–43–10pccc (H–Galden 

1040x)

E1730133 CHF2OCF2OC2F4OCHF2 1,870

HFE–125 3822–68–2 CHF2OCF3 14,900

HFE–134 1691–17–4 CHF2OCHF2 6,320

HFE–143a 421–14–7 CH3OCF3 756
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Table 4.17—Global Warming Potentials

[100-Year Time Horizon]

Name CAS No. Chemical formula

Global 

warming 

potential

(100 yr.)

HFE–227ea 2356–62–9 CF3CHFOCF3 1,540

HFE–236ca12 (HG–10) 78522–47–1 CHF2OCF2OCHF2 2,800

HFE–236ea2 (Desflurane) 57041–67–5 CHF2OCHFCF3 989

HFE–236fa 20193–67–3 CF3CH2OCF3 487

HFE–245cb2 22410–44–2 CH3OCF2CF3 708

HFE–245fa1 84011–15–4 CHF2CH2OCF3 286

HFE–245fa2 1885–48–9 CHF2OCH2CF3 659

HFE–254cb2 425–88–7 CH3OCF2CHF2 359

HFE–263fb2 460–43–5 CF3CH2OCH3 11

HFE–329mcc2 67490–36–2 CF3CF2OCF2CHF2 919

HFE–338mcf2 156053–88–2 CF3CF2OCH2CF3 552

HFE–338pcc13 (HG–01) 188690–78–0 CHF2OCF2CF2OCHF2 1,500

HFE–347mcc3 28523–86–6 CH3OCF2CF2CF3 575

HFE–347mcf2 E1730135 CF3CF2OCH2CHF2 374

HFE–347pcf2 406–78–0 CHF2CF2OCH2CF3 580

HFE–356mec3 382–34–3 CH3OCF2CHFCF3 101

HFE–356pcc3 160620–20–2 CH3OCF2CF2CHF2 110

HFE–356pcf2 E1730137 CHF2CH2OCF2CHF2 265

HFE–356pcf3 35042–99–0 CHF2OCH2CF2CHF2 502

HFE–365mcf3 378–16–5 CF3CF2CH2OCH3 11

HFE–374pc2 512–51–6 CH3CH2OCF2CHF2 557

HFE–449sl (HFE–7100)

Chemical blend

163702–07–6

163702–08–7

C4F9OCH3

(CF3)2CFCF2OCH3

297

HFE–569sf2 (HFE–7200)

Chemical blend

163702–05–4

163702–06–5

C4F9OC2H5

(CF3)2CFCF2OC2H5

59

Sevoflurane 28523–86–6 CH2FOCH(CF3)2 345
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Table 4.17—Global Warming Potentials

[100-Year Time Horizon]

Name CAS No. Chemical formula

Global 

warming 

potential

(100 yr.)

HFE–356mm1 13171–18–1 (CF3)2CHOCH3 27

HFE–338mmz1 26103–08–2 CHF2OCH(CF3)2 380

(Octafluorotetramethylene)hydroxymethyl groupNA X-(CF2)4CH(OH)-X 73

HFE–347mmy1 22052–84–2 CH3OCF(CF3)2 343

Bis(trifluoromethyl)-methanol 920–66–1 (CF3)2CHOH 195

2,2,3,3,3-pentafluoropropanol 422–05–9 CF3CF2CH2OH 42

PFPMIE NA CF3OCF(CF3)CF2OCF2O

CF3

10,300

Source: Table 1-A, 40 CFR Part 98, Subpart A

NA = not available.

4.18 Change of Location: Any transfer of an existing, permitted source from one 

location to another location not on the same property or or at the same

facility.

4.19 Class I Area: A mandatory visibility protection area designated pursuant to 

Section 169A of the federal Clean Air Act.

4.20 Clean Air Act (CAA): Unless otherwise indicated, the federal Clean Air Act 

as amended, 42 United States Code (U.S.C.) 7401, et seq.

4.21 Combustion Contaminant: Any particulate matter discharged into the 

atmosphere from the burning of any material which contains carbon in either 

the free or the combined state.

4.22 Common Operations: Operations which are related through dependent 

processes, storage or transportation of the same or similar products or raw 

material. 

4.23 Compliance Schedule: The date or dates by which a source or category

of sources is required to comply with specific emission limitations 

contained in any air pollution rule, regulation, or statute and with any 

increment of progress toward such compliance.

4.24 Condensed Fumes: Minute, solid particles generated by the condensation of 
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vapors from solid matter after volatilization from the molten state or by the 

sublimation, distillation, calcination, or chemical reaction of processes that 

create airborne particles.

4.25 Construction: Any physical change or change in the method of operation 

(including fabrication, erection, installation, or modification of an emission 

unit) which would result in a change in actual emissions or the source's 

potential to emit.

4.26 Control Equipment: Equipment which is used for the primary purpose 

of eliminating, reducing or controlling the issuance of air contaminants.

4.27 Daily Acreage Allocation: The maximum number of acres of agricultural 

waste, in rice equivalent acres, that may be burned per day in the Butte

County air quality management district as determined by the Central 

Computer Operator (CCO) by using the daily basinwide acreage allocation 

equation contained in the approved Agricultural Burning Plan per Title 17 

CCR. Agricultural burning conducted above 2,000 feet is not included in the 

Daily Acreage Allocation.

4.28 Disposal: Destruction or transformation of garbage or rubbish.

4.29 DISTRICT: The Butte County Air Quality Management District; the air 

quality management district having jurisdiction over air quality in Butte 

County.

4.30 Dust: The minute, solid particles released into the air by natural forces or by 

mechanical processes such as crushing, grinding, milling, drilling, 

demolishing, shoveling, conveying, covering, bagging, sweeping, or other 

similar processes.

4.31 Dwelling: A place of residence.

4.32 Emission: The act of releasing or discharging air contaminants into the 

atmosphere from any source.

4.33 Emission Point: The place, located in a horizontal plane and vertical 

elevation, at which an air contaminant or pollutant enters the atmosphere.

4.34 Emission Unit: An identifiable operation or piece of process equipment such 

as an article, machine, or other contrivance which emits, may emit, or results 

in the emission of any affected pollutant directly or as fugitive emissions.

4.35 Enhanced Vapor Recovery (EVR): A system designed to recover the 

gasoline vapors generated while fueling vehicles in a service station.

4.36 Environmental Protection Agency (EPA): The Environmental Protection 
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Agency of the United States; an independent federal agency established to

coordinate programs aimed at reducing pollution and protecting the

environment.

4.37 Excavation: Removal of surface covering, soil, pavement, etc. to expose the 

underlying soils.

4.38 Executive Officer: The Executive Officer of CARB.

4.39 Exempt Compound: Volatile organic compounds (VOCs) that have low or 

insignificant contribution to ozone formation. These compounds remain 

affected pollutants and subject to the applicable regulatory requirements, 

including but not limited to, health risk assessment. The chemicals in Table 

4.39 are exempt compounds as noted. CAS stands for chemical abstract.

Table 4.39: Exempt Compounds

Compound Name: CAS No.

Acetone 67-64-1

Ethane 74-84-0

Methane 74-82-8

methyl acetate 79-20-9

t-butyl acetate* 540-88-5

Inorganic carbon compounds:

carbon monoxide 630-08-0

carbon dioxide 124-38-9

carbonic acid 463-79-6

metallic carbides or carbonates Various

ammonium carbonate 506-87-6

methyl formate 107-31-3

propylene carbonate 108-32-7

dimethyl carbonate 616-38-6

Chlorinated compounds:

1,1,1-trichloroethane (methyl chloroform) 71-55-6

methylene chloride (dichloromethane) 75-09-2

perchloroethylene (tetrachloroethylene) 127-18-4

Chlorofluorocarbons:

trichlorofluoromethane (CFC-11) 75-69-4

dichlorodifluoromethane (CFC-12) 75-71-8

chlorodifluoromethane (HCFC-22) 75-45-6

trifluoromethane (HFC-23) 75-46-7

1,1,2-trichloro-1,2,2-trifluoroethane (CFC-113) 76-13-1

1,2-dichloro-1,1,2,2-tetrafluoroethane (CFC-114) 76-14-2

chloropentafluoroethane (CFC-115) 76-15-3

Hydrofluorocarbons:

difluoromethane (HFC-32) 75-10-5

1,1,1,2,3,4,4,5,5,5-decafluoropropane (HFC 43-10mee) 138495-42-8
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Table 4.39: Exempt Compounds

Compound Name: CAS No.

pentafluoroethane (HFC-125) 354-33-6

1,1,2,2-tetrafluoroethane (HFC-134) 359-35-3

1,1,1,2-tetrafluoroethane (HFC-134a) 811-97-2

1,1,1-trifluoroethane (HFC-143a) 420-46-2

1,1-difluoroethane (HFC-152a) 75-37-6

ethylfluoride (HFC-161) 353-36-6

1,1,1,2,3,3,3-heptafluoropropane (HFC 227ea) 431-89-0

1,1,1,3,3,3-hexafluoropropane (HFC-236fa) 690-39-1

1,1,2,2,3-pentafluoropropane (HFC-245ca) 679-86-7

1,1,2,3,3-pentafluoropropane (HFC-245ea) 24270-66-4

1,1,1,2,3-pentafluoropropane (HFC-245eb) 431-31-2

1,1,1,3,3-pentafluoropropane (HFC-245fa) 460-73-1

1,1,1,2,3,3-hexafluoropropane (HFC-236ea) 431-63-0

1,1,1,3,3-pentafluorobutane (HFC-365mfc) 406-58-6

Hydrochlorofluorocarbons:

chlorofluoromethane (HCFC-31) 593-70-4

2,2-dichloro-1,1,1-trifluoroethane (HCFC-123) 306-83-2

1,2-dichloro-1,1,2-trifluoroethane (HCFC-123a) 354-23-4

2-chloro-1,1,1,2-tetrafluoroethane (HCFC-124) 2837-89-0

1,1-dichloro-1-fluoroethane (HCFC-141b) 1717-00-6

1-chloro-1,1-difluoroethane (HCFC-142b) 75-68-3

1 chloro-1fluoroethane (HCFC-151a) 1615-75-4

3,3-dichloro-1,1,1,2,2-pentafluoropropane (HCFC-225ca) 422-56-0

1,3-dichloro-1,1,2,2,3-pentafluoropropane (HCFC-225cb) 507-55-1

Hydrofluoroethanes:

1,1,1,2,2,3,3-heptafluoro-3-methoxypropane (HFE-7000) 375-03-1

1,1,1,2,2,3,3,4,4-nonafluoro-4-methoxy-butane (HFE-7100) 163702-07-6

1-ethoxy-1,1,2,2,3,3,4,4,4-nonafluorobutane (HFE-7200) 163702-05-4

1,1,1,2,2,3,4,5,5,5-decafluoro-3-methoxy-4-trifluoromethylpentane (HFE-7300)132182-92-4

3-ethoxy-1,1,1,2,3,4,4,5,5,6,6,6-dodecafluoro-2(trifluoromethyl) 

hexane (HFE-7500)

297730-93-9

Parachlorobenzotrifluoride (PCBTF) 98-56-6

2-(difluoromethoxymethyl)-1,1,1,2,3,3,3-heptafluoropropane 

((CF3)2CFCF2OCH3))

163702-08-7

2-(ethoxydifluoromethyl)-1,1,1,2,3,3,3-heptafluoropropane 

((CF3)2CFCF2OC2H5)

163702-06-5

Cyclic, branched, or linear completely methylated siloxanes (VMS) Various

Perfluorocarbon compounds which fall into these classes:

cyclic, branched, or linear completely fluorinated alkanes; Various

cyclic, branched, or linear completely fluorinated ethers with no 

unsaturations;

Various

cyclic, branched, or linear completely fluorinated tertiary Various
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Table 4.39: Exempt Compounds

Compound Name: CAS No.

amines with no unsaturations; and

sulfur containing perfluorocarbons with no unsaturations and 

with sulfur bonds only to carbon and fluorine.

Various

* VOC for purposes of recordkeeping, emissions reporting, and photochemical modeling and inventory 

requirements which apply to VOC; but not VOC for purposes of determining VOC emission limitations 

or meeting content requirements.

Exempt compounds content of a coating shall be determined by South Coast 

Air Quality Management District Method 303-91 (Revised August 1996)

4.40 Existing Retail Service Station: Any retail service station operating, 

constructed, or under construction as of January 13, 1989.

4.41 Facility: Same as a “stationary source”.

4.42 Flue: Any duct or passage for air, gases or the like, such as a stack or 

chimney.

4.43 Fossil Fuel: Natural gas, petroleum, coal and any form of solid, liquid, or 

gaseous fuel derived from such materials.

4.44 Fossil Fuel-Fired Steam Generator: A furnace or boiler used in the process 

of burning fossil fuel for the primary purpose of producing steam by heat 

transfer. 

4.45 Fugitive Dust: Any solid particulate matter that becomes airborne, other 

than that emitted from an exhaust stack, directly or indirectly as a result of the 

activities of any person.

4.46 Garbage: Discarded or useless material except vegetative wastes and 

agricultural wastes.

4.47 Gasoline: Any organic liquid (including petroleum distillates and methanol) 

having a Reid vapor pressure of four (4) pounds or greater and used as a 

motor vehicle fuel or any fuel which is commonly or commercially known or 

sold as gasoline, including methanol 85 (M85).

4.48 Gasoline Vapors: Any and all organic compound vapors displaced from 

gasoline storage tanks or gasoline delivery vehicles during the transfer of 

gasoline. Any liquid gasoline entrained in the displaced vapors shall be 

included when measuring the total mass of organic vapors emitted during 

gasoline transfer operations.

4.49 Greenhouse Gases (GHGs): The aggregate group of six greenhouse gases: 

carbon dioxide, nitrous oxide, methane, hydrofluorocarbons (by category), 
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perfluorocarbons (by category), and sulfur hexafluoride.

4.50 Hazardous Air Pollutant (HAP): Any substance listed in or pursuant to 

Section 112(b) of the Clean Air Act.

4.51 Health and Safety Code (HSC): The Health and Safety Code of the State of 

California.

4.52 Hearing Board: The Hearing Board of the Butte County Air Quality 

Management District.

4.53 Incineration: An operation in which combustion is carried on for the 

principal purpose, or with the principal result of oxidizing a waste material to 

reduce its bulk or facilitate its disposal.

4.54 Installation: The placement, assemblage, or construction of equipment or 

control apparatus at the premises where the equipment or control apparatus 

will be used, including all preparatory work at such premises.

4.55 Incinerator: Any device constructed of nonflammable materials, including 

containers commonly known as burn barrels, for the purpose of burning 

therein trash, debris, and other flammable materials for volume reduction or 

destruction.

4.56 Leak Free: A liquid leak of less than three (3) drops per minute excluding 

losses which occur upon disconnecting transfer fittings, provided such 

disconnect losses do not exceed 10 milliliters (0.34 fluid ounces) per 

disconnect, averaged over three disconnects.

4.57 Major Source: A stationary source which has the potential to emit a 

regulated air pollutant or HAP in quantities equal to or exceeding the lesser of 

any of the following thresholds:

4.57.1 100 tons per year (tpy) of any regulated air pollutant;

4.57.2 50 tpy of volatile organic compounds or oxides of nitrogen for a 

federal nonattainment area classified as serious, 25 tpy for an area 

classified as severe, or, 10 tpy for an area classified as extreme;

4.57.3 70 tpy of PM10 (particulate matter of 10 microns or less) for a 

federal PM10 nonattainment area classified as serious;

4.57.4 10 tpy of one HAP or 25 tpy of two or more HAPs;

4.57.5 Any lesser quantity threshold promulgated by EPA; or, 

4.57.6 100 tpy of total GHGs emissions and 100,000 tpy of Carbon 

Dioxide equivalent (CO2e) emissions.

 

4.58 Modification: Any physical change or operational change to an existing 

emissions unit, including changing hours of operation or production rate, 

which would necessitate a change in permit conditions. A modification to a 

stationary source shall include any modification of its permitted emissions 
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Rule 101 April 24, 2014 101-13

units or addition of any new emissions units. A modification also occurs 

when there is an increase of emissions from an emissions unit which is not 

subject to a daily emissions limitation. Unless previously limited by a 

federally enforceable permit condition, the following shall not

4.58.1 Routine maintenance or repair.

be considered 

a modification:

4.58.2 A change in ownership.

4.58.3 Replacement of an existing emissions unit, part of an emissions unit, 

or emissions control device with an identical (the same in all 

respects except for the serial number) piece of equipment resulting 

in emissions less than or equal to those from the original equipment 

or device and not requiring a change in permit conditions.

4.58.4 An increase in the production rate or hours of operation if such 

increase does not exceed the operating design capacity or the actual 

demonstrated capacity of the stationary source as approved by the

APCO.

4.58.5 Use of an alternate fuel or raw material, provided that such use is 

expressly authorized by the APCO.

A reconstructed stationary source shall be treated as a new stationary source 

and not as a modification.

4.59 Motor Vehicle: A vehicle that is self-propelled as defined in Section 415 of 

the California Vehicle Code.

4.60 Multiple-Chamber Incinerator: Any article, machine, equipment, 

contrivance, structure or part of a structure, used to dispose of combustible 

refuse by burning, consisting of three or more refractory lined combustion 

furnaces in series, physically separated by refractory walls, inter-connected by 

gas passage ports or ducts employing adequate design parameters necessary 

for maximum combustion of the materials to be burned.

4.61 Multi-Unit Dwelling: Apartments, condominiums, four-plexes and other 

types of dwellings consisting of more than two living units.

4.62 National Emissions Standards for Hazardous Air Pollutants (NESHAPs): 

The emissions standards set by the federal government for a Hazardous Air 

Pollutant that may cause an increase in fatalities or in serious, irreversible, or 

incapacitating illness. Each NESHAP is published as an individual Subpart to 

Title 40 Code of Federal Regulations (CFR) Part 60 or 63.

4.63 No-Burn Day: Any day, or portion thereof, designated by the APCO, 

CARB, or a local, State or federal Fire Protection Agency having jurisdiction 

over the burn location, during which no fires may be ignited and no material 

may be added to an approved existing fire, except as authorized in DISTRICT 

Rule 300.
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4.64 Non-Agricultural Burning: Open burning for the disposal of nonagricultural waste pursuant to DISTRICT Rule 300. 

4.65 Open Burning: Combustion of any material of any type, outdoors in the 

open air, where the products of combustion are not directed through a flue, 

stack or chimney.

4.66 Orchard or Citrus Heaters: Any article, machine, equipment, or other 

contrivance that burns any type of fuel or material capable of emitting air 

contaminants and is used or capable of being used for the purpose of giving 

protection from frost damage.

4.67 Owner or Operator: Any person who owns, operates, controls, or 

supervises an affected facility, or a stationary source of which an affected 

facility is a part.

4.68 Particulate Matter (PM): Any material except uncombined water, which 

can exist in a finely divided form in the atmosphere as a liquid or solid at 

standard conditions.

4.69 Pathological Waste: Human or animal tissue intended for disposal.

4.70 Person: Any individual, firm, association, organization, partnership, 

business trust, corporation, limited liability company, or company; State or 

local government agency, public district, or any officer or employee thereof;

or the United States or its agencies, to the extent authorized by federal law.

4.71 Phase I Vapor Recovery System: A CARB-certified gasoline vapor 

recovery system which recovers vapors during the transfer of gasoline from 

delivery vessels into stationary storage tanks.

4.72 Phase II Vapor Recovery System: A CARB-certified gasoline vapor 

recovery system which recovers vapors during the fueling of motor vehicles 

from stationary storage tanks.

4.73 PM2.5 Nonattainment Area: The portion of Butte County which lies west 

of the line described as follows: (Mount Diablo Base and Meridian) 

Beginning at the intersection of the Butte-Yuba county line and the township 

line common to T18N R6E and T19N R6E, west to the township line 

common to T18N R6E and T19N R6E, then north along the range line 

common to R5E and R6E, then west along the township line common to 

T21N and T20N, then north along the range line common to R4E and R5E, 

then west along the township line common to T24N and T23N to the ButteTehama County boundary.

4.74 PM2.5: Particulate Matter with aerodynamic diameter of less than 2.5 

microns. Gaseous emissions which condense to form particulate matter at 
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Rule 101 April 24, 2014 101-15

ambient temperatures shall be included.

4.75 PM10: Particulate Matter with aerodynamic diameter of less than 10 

microns. Gaseous emissions which condense to form particulate matter at 

ambient temperatures shall be included.

4.76 Populated Area: The urban areas of Chico, Oroville, Paradise, Gridley, 

Biggs, or any other urban area designated by the APCO.

4.77 Portable Emissions Unit: Any emissions unit that, by itself or in or on a 

piece of equipment, is portable, meaning designed to be and capable of being 

carried or moved from one location to another. Indications of portability 

include, but are not limited to, wheels, skids, carrying handles, dolly, trailer, 

platform or mounting. The period during which the emissions unit is 

maintained at a storage facility shall be excluded from determining the 

residency requirements below. An emission unit is not portable if:

4.77.1 the emissions unit is attached to a foundation, or remains or will 

remain at a fixed location for more than twelve (12) consecutive 

months. (Any emissions unit, such as a backup or standby unit, that 

replaces an emissions unit at a location and is intended to perform 

the same function as the unit being replaced will be included in 

calculating the consecutive time period. In that case, the cumulative 

time of both emissions units, including the time between the 

removal of the original unit and installation of the replacement unit, 

would be counted towards the consecutive time period.); or,

4.77.2 the emissions unit remains or will remain at a fixed location for less 

than twelve (12) consecutive months where such a period represents 

the length of normal annual source operations at the stationary 

source that resides at a fixed location for more than twelve (12) 

consecutive months such as a seasonal source; or,

4.77.3 the emissions unit is removed from one location for a period and 

then returned to the same location in an attempt to circumvent the 

portable equipment residence time requirement.

4.78 Potential to Emit: The maximum capacity of an emissions unit to emit a 

pollutant under its physical and operational design. Any physical or 

operational limitation on the capacity of the unit to emit a pollutant, including 

pollution control equipment and restrictions in 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 incorporated into the applicable permit as a practically 

enforceable permit condition. The potential to emit shall include emissions 

emitted directly or as fugitives.

4.79 Pressure Tank: A tank which maintains working pressure sufficient at all 

times to prevent hydrocarbon vapor or gas loss to the atmosphere.
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Rule 101 April 24, 2014 101-16

4.80 Process Weight Per Hour: The total weight, including contained moisture, 

of all materials introduced into any specific process, which process may cause 

any discharge into the atmosphere. Solid fuels charged will be considered as 

part of the process weight, but liquid and gaseous fuels and combustion air 

will not. (The process weight per hour will be derived by dividing the total 

process weight by the number of hours in one complete operation from the 

beginning of any given process to the completion thereof, excluding any time 

during which the equipment is idle).

4.81 Prohibited Materials: Any waste or manufactured material, including but 

not limited to: petroleum products and petroleum wastes; construction and 

demolition wastes; tar paper; roofing material; wiring; flooring material; 

insulation; plywood; coated wire; disposable diapers and putrescible wastes; 

tires; tar; non-natural wood waste; processed, painted or treated wood 

products; metals; motor vehicle bodies or parts; rubber; synthetics; plastics, 

including plastic film, twine and pipe; fiberglass; styrofoam; garbage; trash; 

refuse; rubbish; swill; ashes; glass; industrial wastes; equipment; appliances; 

furniture; instruments; utensils; mattresses; shoes; cloth; rags; paper and 

paper products; cardboard; boxes; crates; excelsior and other packaging 

materials; offal, including the carcass of any dead animal; human or animal 

parts or wastes, including blood and fecal matter; food contaminated material; 

or any other non-vegetative material that when burned may discharge air 

contaminants that may cause a health risk to any person.

4.82 Public Record: Any record made available to the public by law containing 

information relating to the conduct of the public's business that is prepared, 

owned, used or retained by the DISTRICT, except those records that are not 

subject to disclosure pursuant to applicable law.

4.83 Reactive Organic Compound (ROC): Any volatile compound containing at 

least one atom of carbon, excluding any Exempt Compound as defined in this 

Rule (same as Volative Organic Compound in this Rule).

4.84 Record: Handwriting, typewriting, printing, photostating, photographing, 

and every other means of recording upon any form of communication or 

representation including letters, words, pictures, sounds, or symbols, or any 

combination thereof, and all papers, maps, magnetic or paper tapes, 

photographed films and prints, magnetic or punched cards, drums, and other 

documents.

4.85 Reid Vapor Pressure (RVP): The absolute vapor pressure of volatile crude 

oil and volatile non-viscous petroleum liquids, except liquefied petroleum 

gases, as determined by ASTM-323-58 (American Society for Testing and 

Materials).

4.86 Residence or Residential: Areas where people reside or lodge, including but 

not limited to, single or multiple family dwellings, condominiums, mobile or 
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Rule 101 April 24, 2014 101-17

manufactured homes, apartment complexes, motels and hotels.

4.87 Residential Burning: Open burning for the disposal of vegetative waste 

from the property of a single- or two-family dwelling located on lots of less 

than one acre.

4.88 Rice Equivalent Acre: The quantity of particulate matter generated from the 

open burning of one (1) acre of rice straw after harvest standardized as 6.3 

pounds of PM10 per ton of rice straw burned at a fuel load of three (3) tons 

per acre (18.9 pounds PM10 per acre).

4.89 Rubbish: Useless waste or rejected matter; usually commbustible and 

noncombustible solid wastes of commercial and industrial establishments, 

institutions, etc.; garbage.

4.90 Sacramento Valley Air Basin: The geographical area which includes the 

following counties: Butte, Colusa, Glenn, Placer, Sacramento, Shasta,

Tehama,Yolo, Solano,Yuba and Sutter.

4.91 School: Any public or private establishment used for the purpose of 

educating more than twelve (12) children in kindergarten or any of the grades 

1 through 12, inclusive, but does not include any private establishment in 

which education is primarily conducted in private homes.

4.92 Shutdown: Ceasing of operation of a stationary source for any purpose.

4.93 Single- and Two-Family Dwellings: Residential structures including 

duplexes, mobile homes, and such dwellings that are collectively designed or 

planned to house not more than two families.

4.94 Source Test Method or CARB Source Test Method: A procedure for 

performing source testing as set forth in Title 17 CCR Section 91200 et seq.

4.95 Standard Conditions: A gas temperature of 20 oC (68o

F) and a gas 

pressure of 760 mm Hg (14.7 pounds per square inch) absolute.

4.96 Standard Cubic Meter of Gas (Standard Cubic Foot of Gas): The amount 

of gas, free of combined water, that would occupy the specified cubic 

measurement at standard conditions.

4.97 Standard Industrial Classification (SIC) Code: The SIC Code that 

classifies establishments by the type of business activity in which they are 

engaged as defined by the SIC Manual, 1987, published by the Executive 

Officer of the President, Office of Management and Budget, 1987, which is 

incorporated by reference herein.

4.98 Start-up: Commencing operation of a stationary source for any purpose.
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Rule 101 April 24, 2014 101-18

4.99 Stationary Source: Any building, structure, or emissions unit which emits 

or may emit any affected pollutant directly or as a fugitive emission, which:

4.99.1 is located on one or more contiguous or adjacent properties, and 

which may be separated by a public right-of-way; and.

4.99.2 is under the same or common ownership, operation, or control, or 

which is owned or operated by entities which are under common 

control and belong to the same industrial grouping, either by virtue 

of falling within the same two-digit SIC Code or by virtue of being 

part of a common industrial process, manufacturing process, or 

connected process involving a common raw material.

4.100 Total Reduced Sulfur (TRS): Total reduced sulfur contained in hydrogen 

sulfide, mercaptans, dimethyl sulfide, dimethyl disulfide or other organic 

sulfide compounds, all expressed as hydrogen sulfide. Sulfur dioxide, sulfur 

trioxide, or sulfuric acid mist are not to be included in the determination of 

TRS.

4.101 Toxic Air Contaminants: All substances identified as toxic air contaminants 

pursuant to Title 17 CCR, Sections 93000 and 93001.

4.102 Underground Storage Tank (UST): Any one or combination of tanks and 

the volume of any connected piping that has at least 10% of the underground 

tank system volume below the ground surface or enclosed below earthen 

materials.

4.103 Upset or Breakdown Condition: An unforeseeable failure or malfunction of 

either: 1) any air pollution control equipment or related operating equipment 

which causes a violation of any emission limitation or restriction prescribed 

by these Rules and Regulations, or by State Law; or 2) any in-stack 

continuous monitoring equipment, which:

4.103.1 Is not the result of neglect or disregard of any air pollution control 

law or rule or regulation; 

4.103.2 Is not intentional or the result of negligence; 

4.103.3 Is not the result of improper maintenance; 

4.103.4 Does not constitute a nuisance; and 

4.103.5 Is not a recurrent breakdown of the same equipment.

4.104 Vapor Extraction System or Soil Vapor Extraction (SVE): An 

underground or aboveground system that draws out or removes contaminants 

from soil or ground water using air injection and/or vacuum suction to route 

the vapors to an emission control device or directly to the atmosphere. This 

definition does not include equipment designed or used to expose soil openly 

to the atmosphere to facilitate evaporation of volatile organic compounds.

4.105 Vapor Tight: The detection of less than 10,000 ppmv, as methane, using an 

appropriate hydrocarbon analyzer when sampling is performed according to 

the procedures specified in EPA Method 21 or no visible evidence of air 
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Rule 101 April 24, 2014 101-19

entrainment in the sight glasses of liquid delivery hoses.

4.106 Variance: Temporary exemption from DISTRICT Rules and Regulations or 

State law granted to sources following ruling by the DISTRICT Hearing 

Board.

4.107 Volatile Organic Compounds (VOCs): Any organic chemical compound 

containing at least one atom of carbon having a high enough vapor pressure 

under normal conditions to signifcantly vaporize into the earth’s atmosphere, 

excluding any Exempt Compound as defined in this Rule.

4.108 Volatile Organic Compound Vapor Analyzer: A hydrocarbon vapor 

instrument detector, which satisfies the specification requirements of EPA

Method 21, 40 CFR Part 60. Analyzer types that may meet this requirement 

include, but are not limited to, catalytic oxidation, flame ionization, infrared 

absorption, and photoionization.

5 SEVERABILITY: If any regulation, rule, section, subsection, sentence, clause, 

phrase, or portion of these Rules and Regulations is, for any reason, held invalid, 

unconstitutional, or unenforceable by any court of compentent jurisdiction, such 

portion shall be deemed as a separate, distinct, and independent provision, and such 

holding shall not affect the validity of the remaining portions of the Rules and 

Regulations of the Butte County Air Quality Management District.

6 REFERENCES: The authority for this Rule arises from the provisions of California 

Health and Safety Code Section 40001 and 40702.