BUTTE COUNTY AQMD RULES AND REGULATIONS 

Rule 101 Proposed for Adoption 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, 

Proposed Amendments April 24, 2014) 

RULE 101 CONTENTS

1 PURPOSE 

2 APPLICABILITY 

3 ACRONYMS 

4 DEFINITIONS OF TERMS 

5 SEVERABILITY 

6 REFERENCES 
BUTTE COUNTY AQMD RULES AND REGULATIONS 

Rule 101 Proposed for Adoption 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 are 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. 
BUTTE COUNTY AQMD RULES AND REGULATIONS 

Rule 101 Proposed for Adoption April 24, 2014 101-3

4.4 Agricultural Burning: Burning for the disposal of agricultural vegetative 

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: The person appointed by the DISTRICT 

Board pursuant to HSC Section 40750 to serve as the Air Pollution Control 

Officer (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 
BUTTE COUNTY AQMD RULES AND REGULATIONS 

Rule 101 Proposed for Adoption April 24, 2014 101-4

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

in order to reduce its smoke level. 

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.

4.154.17 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 4.174.16 (Global Warming Potentials) and summing 

the resultant values. 

Table 4.174.16—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 2521

Nitrous oxide 10024–97–2 N2O 298310

HFC–23 75–46–7 CHF3 14,80011,700

HFC–32 75–10–5 CH2F2 675650

HFC–41 593–53–3 CH3F 92150

HFC–125 354–33–6 C2HF5 3,5002,800

HFC–134 359–35–3 C2H2F4 1,1001,000

HFC–134a 811–97–2 CH2FCF3 1,4301,300

HFC–143 430–66–0 C2H3F3 353300

HFC–143a 420–46–2 C2H3F3 4,4703,800

HFC–152 624–72–6 CH2FCH2F 53
BUTTE COUNTY AQMD RULES AND REGULATIONS 

Rule 101 Proposed for Adoption April 24, 2014 101-5

Table 4.174.16—Global Warming Potentials 

[100-Year Time Horizon]

Name CAS No. Chemical formula 

Global 

warming 

potential 

(100 yr.) 

HFC–152a 75–37–6 CH3CHF2 124140

HFC–161 353–36–6 CH3CH2F 12

HFC–227ea 431–89–0 C3HF7 3,2002,900

HFC–236cb 677–56–5 CH2FCF2CF3 1,340

HFC–236ea 431–63–0 CHF2CHFCF3 1,370

HFC–236fa 690–39–1 C3H2F6 9,8106,300

HFC–245ca 679–86–7 C3H3F5 693560

HFC–245fa 460–73–1 CHF2CH2CF3 1,030

HFC–365mfc 406–58–6 CH3CF2CH2CF3 794

HFC–43–10mee 138495–42–8 CF3CFHCFHCF2CF3 1, 640300

Sulfur hexafluoride 2551–62–4 SF6 22,80023,900

Trifluoromethyl sulphur 

pentafluoride 

373–80–8 SF5CF3 17,700

Nitrogen trifluoride 7783–54–2 NF3 17,200

PFC–14 (Perfluoromethane) 75–73–0 CF4 7,3906,500

PFC–116 (Perfluoroethane) 76–16–4 C2F6 12,2009,200

PFC–218 (Perfluoropropane) 76–19–7 C3F8 8,8307,000

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

PFC–3–1–10 (Perfluorobutane) 355–25–9 C4F10 8,8607,000

Perfluorocyclobutane 115–25–3 C-C4F8 10,3008,700

PFC–4–1–12 (Perfluoropentane) 678–26–2 C5F12 9,1607,500

PFC–5–1–14 

(Perfluorohexane) 

355–42–0 C6F14 9,3007,400

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
BUTTE COUNTY AQMD RULES AND REGULATIONS 

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Table 4.174.16—Global Warming Potentials 

[100-Year Time Horizon]

Name CAS No. Chemical formula 

Global 

warming 

potential 

(100 yr.) 

HFE–125 3822–68–2 CHF2OCF3 14,900

HFE–134 1691–17–4 CHF2OCHF2 6,320

HFE–143a 421–14–7 CH3OCF3 756

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
BUTTE COUNTY AQMD RULES AND REGULATIONS 

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Table 4.174.16—Global Warming Potentials 

[100-Year Time Horizon]

Name CAS No. Chemical formula 

Global 

warming 

potential 

(100 yr.) 

HFE–569sf2 (HFE–7200) 

Chemical blend 

163702–05–4

163702–06–5

C4F9OC2H5

(CF3)2CFCF2OC2H5

59

Sevoflurane 28523–86–6 CH2FOCH(CF3)2 345

HFE–356mm1 13171–18–1 (CF3)2CHOCH3 27

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

(Octafluorotetramethylene)hydroxymethyl group NA 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. 

4.164.18 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. 

4.174.19 Class I Area: A mandatory visibility protection area designated pursuant 

to Section 169A of the federal Clean Air Act. 

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

Act as amended, 42 United States Code 7401, et seq.

4.19 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.

4.204.21 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. 

4.214.22 Common Operations: Operations which are related through dependent 

processes, storage or transportation of the same or similar products or raw 
BUTTE COUNTY AQMD RULES AND REGULATIONS 

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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.

4.224.24 Condensed Fumes: Minute, solid particles generated by the condensation 

of 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.

4.234.25 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. 

4.244.26 Control Equipment: Equipment which is used for the primary 

purpose of eliminating, reducing or controlling the issuance of air 

contaminants.

Condensed Fumes: Minute, solid particles generated by the condensation of 

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.

4.254.27 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 of 

the California Code of Regulations. Agricultural burning conducted above 

2,000 feet is not included in the Daily Acreage Allocation. 

4.26 Dwelling: A place of residence.

4.274.28 Disposal: Destruction or transformation of garbage or rubbish. 

4.284.29 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.
BUTTE COUNTY AQMD RULES AND REGULATIONS 

Rule 101 Proposed for Adoption April 24, 2014 101-9

4.31 Dwelling: A place of residence.

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

atmosphere from any source. 

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

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

4.314.34 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. 

4.324.35 Enhanced Vapor Recovery: A system designed to recover the gasoline 

vapors generated while fueling vehicles in a service station.

4.334.36 Environmental Protection Agency (EPA): The Environmental Protection 

Agency of the United States; an independent federal agency established to 

coordinate programs aimed at reducing pollution and protecting the 

environment. 

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

the underlying soils. 

4.354.38 Executive Officer: The Executive Officer of CARB.

4.364.39 Exempt Compound: Volatile organic compounds 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 

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

Table 4.394.38: 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 
BUTTE COUNTY AQMD RULES AND REGULATIONS 

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Table 4.394.38: Exempt Compounds 

Compound Name: CAS No. 

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 

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 
BUTTE COUNTY AQMD RULES AND REGULATIONS 

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Table 4.394.38: Exempt Compounds 

Compound Name: CAS No. 

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 

amines with no unsaturations; and 

Various 

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) 

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

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

4.384.41 Facility: Same as a “stationary source”. 

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

chimney. 

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

gaseous fuel derived from such materials. 

4.414.44 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. 

4.424.45 Fugitive Dust: Any solid particulate matter that becomes airborne, other 
BUTTE COUNTY AQMD RULES AND REGULATIONS 

Rule 101 Proposed for Adoption April 24, 2014 101-12

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

activities of any person. 

4.434.46 Garbage: Discarded or useless material except vegetative wastes and 

agricultural wastes. 

4.444.47 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). 

4.454.48 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. 

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

carbon dioxide, nitrous oxide, methane, hydrofluorocarbons (by category), 

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.

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

of California.

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

Management District. 

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

California.

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.

4.494.53 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.
BUTTE COUNTY AQMD RULES AND REGULATIONS 

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4.504.55 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.

4.514.56 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. 

4.524.57 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: 

4.52.14.57.1 100 tons per year (tpy) of any regulated air pollutant;

4.52.24.57.2 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;

4.52.34.57.3 70 tpy of PM10 (particulate matter of 10 microns or less) for 

a federal PM10 nonattainment area classified as serious;

4.52.44.57.4 10 tpy of one HAP or 25 tpy of two or more HAPs;

4.52.54.57.5 Any lesser quantity threshold promulgated by EPA; or, 

4.52.64.57.6 100 tpy of total GHGs emissions and 100,000 tpy of Carbon 

Dioxide equivalent (CO2e) emissions. 

 

4.534.58 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 

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 be considered 

a modification: 

4.53.14.58.1 Routine maintenance or repair. 

4.53.24.58.2 A change in ownership. 

4.53.34.58.3 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. 

4.53.44.58.4 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. 

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

is expressly authorized by the APCO.
BUTTE COUNTY AQMD RULES AND REGULATIONS 

Rule 101 Proposed for Adoption April 24, 2014 101-14

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.

4.544.60 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.

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

types of dwellings consisting of more than two living units.

4.56 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.

4.57

4.584.62 National Emissions Standards for Hazardous Air Pollutants

(NESHAPs): The emissions standards set by the federal governmetn 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. 

4.594.63 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. 

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

4.604.65 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. 

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

contrivance that burns any type of fuel or material capable of emitting air 
BUTTE COUNTY AQMD RULES AND REGULATIONS 

Rule 101 Proposed for Adoption April 24, 2014 101-15

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

protection from frost damage. 

4.624.67 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. 

4.634.68 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. 

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

4.654.70 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. 

4.664.71 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 Butte-Tehama 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 

ambient temperatures shall be included.

4.67

4.684.75 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.

4.694.76 Populated Area: The urban areas of Chico, Oroville, Paradise, Gridley, 
BUTTE COUNTY AQMD RULES AND REGULATIONS 

Rule 101 Proposed for Adoption April 24, 2014 101-16

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

4.704.77 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:

4.70.14.77.1 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, 

4.70.24.77.2 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.

4.714.78 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.

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

microns.

4.73

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

microns.

4.75

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

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

not limited to: petroleum products and petroleum wastes; construction and 
BUTTE COUNTY AQMD RULES AND REGULATIONS 

Rule 101 Proposed for Adoption April 24, 2014 101-17

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.

4.77

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

times to prevent hydrocarbon vapor or gas loss to the atmosphere. 

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.

4.794.82 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. 

4.804.83 Reactive Organic Compound (ROC): Any volatile compound containing

at least one atom of carbon, excluding any Exempt Compound as defined in 
BUTTE COUNTY AQMD RULES AND REGULATIONS 

Rule 101 Proposed for Adoption April 24, 2014 101-18

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

4.814.84 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. 

4.824.85 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). 

4.834.86 Residence or Residential: Areas where people reside or lodge, including 

but not limited to, single or multiple family dwellings, condominiums, mobile 

or manufactured homes, apartment complexes, motels and hotels. 

4.844.87 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. 

4.854.88 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). 

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

noncombustible solid wastes of commercial and industrial establishments, 

institutions, etc.; garbage. 

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

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

Tehama,Yolo, Solano,Yuba and Sutter. 

4.884.91 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.

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

4.904.93 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. 

4.914.94 Source Test Method or CARB Source Test Method: A procedure for 
BUTTE COUNTY AQMD RULES AND REGULATIONS 

Rule 101 Proposed for Adoption April 24, 2014 101-19

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

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

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

4.92.1 is located on one or more contiguous or adjacent properties, 

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

4.92.2 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 Standard 

Industrial Classification (SIC) Code or by virtue of being part 

of a common industrial process, manufacturing process, or 

connected process involving a common raw material.

4.92.3

4.934.95 Standard Conditions: A gas temperature of 20 oC (68oF) and a gas 

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

4.944.96 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. 

4.954.97 Standard Industrial Classification (SIC) Code: The Standard Industrial 

Classification (SIC) Code that classifies establishments by the type of 

business activity in which they are engaged as defined by the Standard 

Industrial Classification 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.

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

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

4.96.14.99.1 is located on one or more contiguous or adjacent properties, 

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

4.96.24.99.2 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 Standard Industrial 

Classification (SIC) Code or by virtue of being part of a common 

industrial process, manufacturing process, or connected process 

involving a common raw material.

4.974.100 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 
BUTTE COUNTY AQMD RULES AND REGULATIONS 

Rule 101 Proposed for Adoption April 24, 2014 101-20

determination of TRS.

4.984.101 Toxic Air Contaminants: All substances identified as toxic air 

contaminants pursuant to Title 17, CCR, Sections 93000 and 93001.

4.994.102 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. 

4.1004.103 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: 

4.100.14.103.1 Is not the result of neglect or disregard of any air pollution 

control law or rule or regulation; 

4.100.24.103.2 Is not intentional or the result of negligence; 

4.100.34.103.3 Is not the result of improper maintenance; 

4.100.44.103.4 Does not constitute a nuisance; and 

4.100.54.103.5 Is not a recurrent breakdown of the same equipment.

4.1014.104 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. 

4.1024.105 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 entrainment in the sight glasses of liquid delivery hoses. 

4.1034.106 Variance: Temporary exemption from DISTRICT Rules and 

Regulations or State law granted to sources following ruling by the 

DISTRICT Hearing Board. 

4.1044.107 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.

4.1054.108 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 
BUTTE COUNTY AQMD RULES AND REGULATIONS 

Rule 101 Proposed for Adoption April 24, 2014 101-21

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.