(Adopted 10/22/68)

A. Except as otherwise specifically provided in these Rules and except 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 of the State of California.

(Revised 3/9/76)

Acceptable Incinerator. "Acceptable Incinerator" means any device or contrivance designed to consume combustible refuse without creating objectionable odor, smoke, or contaminants in excess of specified emission limits. An acceptable incinerator must have a chimney or flue.

(Revised 5/23/72)

Air Contaminant. "Air Contaminant" or "Air Pollutant" means any discharge, release, or other propagation into the atmosphere and includes but is not limited to, smoke, charred paper, dust, soot, grime, carbon, fumes, gases, odors, particulate matter, acids or any combination thereof.

(Revised 6/23/81)

 Air Pollution Abatement Operation. "Air Pollution Abatement Operation" means any operation which has as its essential purpose a significant reduction in:

  1. The emission of air contaminants; or,
  2. The effect of such emission.


 Air Pollution Control Officer. "Air Pollution Control Officer" means the Air Pollution Control Officer or his duly authorized assistants and deputies.

(Added 3/26/74)

 Air Quality Standards. "Air Quality Standards" as used in these Regulations refers to those ambient air quality standards as promulgated by State or Federal pollution control agencies or as described in these Regulations.

(Added 5/23/72, Revised 7/18/72)

Atmosphere. "Atmosphere" means the air that surrounds the earth but does not include the general volume of gases contained in any bona fide building.


 Authority to Construct. "Authority to Construct" means a written permit issued by the Ventura County Air Pollution Control District for the construction, erection, installation, assembling, modification, or replacement of any facility including any article, machine, equipment or contrivance the use of which may cause the issuance, reduction, control or elimination of air contaminants.

 (Added 5/23/72)

 Batch Operation. "Batch Operation" means an operation which groups a finite number of objects together for the same process at the same time. Each group may or may not go through identical previous or subsequent manufacturing steps. The "Batch Operation" frequency may range from less than once per week to no more than three times in an eight hour shift. A "Batch Operation" shall not be construed to include the loading or unloading of organic liquids.

 (Added 6/20/78)

Best Available Control Technology (BACT). "Best Available Control Technology" means the most stringent emission limitation or control technology for an emissions unit which:

  1. Has been achieved in practice for such emissions unit category, or
  2. Is contained in any implementation plan approved by the Environmental Protection Agency for such emissions unit category. A specific limitation or control shall not apply if the owner or operator of such emissions unit demonstrates to the satisfaction of the Air Pollution Control Officer (APCO) that such limitation or control technology is not presently achievable, or
  3. Any other emission limitation or control technology, including, but not limited to, replacement of such emissions unit with a lower emitting emissions unit, application of control equipment or process modifications, determined by the APCO to be technologically feasible for such emissions unit and cost effective as compared to the BACT cost effectiveness threshold adopted by the Ventura County Air Pollution Control Board.

In defining emissions unit categories, the APCO may take into account the function of the emissions unit, the capacity of the emissions unit, the annual throughput of the emissions unit, and the location of the emissions unit with respect to electricity or fuels needed to achieve an emission limitation or control technology.

 (Added 9/28/76, Revised 6/20/78, 6/19/79, 1/10/84, 10/22/91)

 Board. "Board" means the Air Pollution Control Board of the Air Pollution Control District of Ventura County.

Combustible Refuse. "Combustible Refuse" means any solid or liquid combustible waste material containing carbon in a free or combined state.

Combustion Contaminants. "Combustion Contaminants" means particulate matter discharged into the atmosphere from the burning of any kind of material containing carbon in a free or combined state.


Construction. "Construction" means the erection, installation, assembling, modification, or replacement of any article, machine, equipment, or contrivance. Construction begins when any of the following occurs; ground is broken, equipment is moved into position, or any connection or attachment is done to or for the equipment in question.

 (Added 5/23/72)

 Control Strategy. "Control Strategy" means a combination of measures designed to reduce air contaminant emissions to attain and maintain ambient air quality standards.

 (Added 8/17/76

 Crude Oil. "Crude Oil" means any naturally occurring, unrefined petroleum liquid.

 (Added 6/20/78)

 District. "District" shall mean the Ventura County Air Pollution Control District.

 (Added 1/29/74)

 Dust. "Dust" means 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, etc.

 (Added 5/23/72)

 Effluent. "Effluent" means the total volume of gases and/or liquids and/or solids emitted from an emission point.

 (Revised 5/23/72)

 Emission. "Emission" means the act of passing into the atmosphere of air contaminant or a gas stream which may or may not contain an air contaminant or the material so passed into the atmosphere.

 (Revised 5/23/72)

Emission Data. "Emission Data" means measured or calculated concentrations or weights of air contaminants emitted into the ambient air. Data used to calculate emission data are not emission data.

 (Added 1/29/74)

Emission Point. "Emission Point" means any point from which any air contaminants are released into the atmosphere.

 (Added 5/23/72)

Emission Standards. "Emission Standards" as used in these Regulations means U.S. Federal (EPA), State of California (ARB), or Ventura County Air Pollution Control District standards of limits for air contaminant emissions, whichever are the most restrictive.

 (Added 5/23/72, Revised 7/18/72)

Equipment. Any operation, article, machine, equipment, or contrivance which may emit or reduce the emissions of any air contaminant or affected pollutant.

 (Added 11/19/85)

 Exempt Organic Compounds. "Exempt Organic Compounds" means any of the following negligibly-reactive or low-reactive compounds.

1. The following are negligibly-reactive compounds:

carbon monoxide (CO),
carbon dioxide (CO2),
metallic carbides (M-C) or carbonates (M-CO3),
ammonium carbonate ((NH4)HCO3(NH4)CO2NH2),
carbonic acid (CO(OH)2),
methane (CH4),
methylene chloride (dichloromethane),
1,1,1-trichloroethane (methyl chloroform),
trichlorofluoromethane (CFC-11),
dichlorodifluoromethane (CFC-12),
chlorodifluoromethane (HCFC-22),
trifluoromethane (HFC-23),
1,1,2-trichloro-1,2,2-trifluoroethane (CFC-113),
1,2-dichloro-1,1,2,2-tetrafluoroethane (CFC-114),
chloropentafluoroethane (CFC-115),
1,1,1-trifluoro-2,2-dichloroethane (HCFC-123),
2-chloro-1,1,1,2-tetrafluoroethane (HCFC-124),
pentafluoroethane (HFC-125),
1,1,2,2-tetrafluoroethane (HFC-134),
1,1,1,2-tetrafluoroethane (HFC-134a),
1,1-dichloro-1-fluoroethane (HCFC-141b),
1-chloro-1,1-difluoroethane (HCFC-142b),
1,1,1-trifluoroethane (HFC-143a),
1,1-difluoroethane (HFC-152a),

difluoromethane (HFC32),

1,1,1,2,3,4,4,5,5,5-decafluoropentane (HFC4310mee),

3,3-dichloro-1,1,1,2,2-pentafluoropropane (HCFC225ca),

1,3-dichloro-1,1,2,2,3-pentafluoropropane (HCFC225cb),

1,1,1,2,2,3,3,4,4-nonafluoro-4-methoxybutane (C4F9OCH3),

2-(difluoromethoxymethyl)-1,1,1,2,3,3,3 heptafluoropropane [(CF3)2CFCF2OCH3)],

1-ethoxy-1,1,2,2,3,3,4,4,4-nonafluorobutane (C4F9OC2H5),



ethylfluoride (HFC161),

1,1,1,2,3,3-hexafluoropropane (HFC236ea),

1,1,1,3,3,3-hexafluoropropane (HFC236fa),

1,1,2,2,3-pentafluoropropane (HFC245ca),

1,1,2,3,3-pentafluoropropane (HFC245ea),

1,1,1,2,3-pentafluoropropane (HFC245eb),

1,1,1,3,3-pentafluoropropane (HFC245fa),

1,1,1,3,3-pentafluorobutane (HFC365mfc),

chlorofluoromethane (HCFC31),

1,2-dichloro-1,1,2-trifluoroethane (HCFC123a),

1-chloro-1-fluoroethane (HCFC151a),

cyclic, branched, or linear, completely methylated siloxanes (VMS),

and perfluorocarbon (PFC) compounds which fall into these classes:

  1. cyclic, branched, or linear, completely fluorinated alkanes,
  2. cyclic, branched, or linear, completely fluorinated ethers with no unsaturations,
  3. cyclic, branched, or linear, completely fluorinated tertiary amines with no unsaturations, and
  4. sulfur containing perfluorocarbons with no unsaturations and with sulfur bonds only to carbon and fluorine.

Perfluorocarbon compounds will be assumed to be absent from a product or process unless a manufacturer or facility operator identifies the specific individual compounds (from the broad classes of perfluorocarbon compounds) and the amounts present in the product or process and provides an EPA approved test method which can be used to quantify the specific compounds.

2. The following are low-reactive compounds:

methyl acetate,
tetrachloroethylene (perchloroethylene), and
parachlorobenzotrifluoride (1-chloro-4-trifluoromethyl benzene).

 (Added 5/12/92, Revised 12/15/92, 4/9/96, 11/10/98)

 Existing Equipment. "Existing Equipment" means all equipment which is in use or is under actual construction as of the date of rule adoption.

 (Revised 5/23/72, 7/18/72)

 Experimental or Research Operations. "Experimental or Research Operations" mean those operations to which a preponderance of the following characteristics apply:

  1. Not producing a product for commercial use or sale.
  2. The primary objective is not to produce an immediate profit.
  3. The primary objective is to advance the state-of-the-art.
  4. Frequently accompanied by literature search, theoretical studies and computer modeling.
  5. Operations are under direct control of engineers or scientists.
  6. Theoretical solutions are evaluated by hardware testing.
  7. Limited quantities of hardware are built for test purposes.
  8. Hardware may incorporate special instrumentation for design and performance evaluation.
  9. Hardware frequently is sub-scale, pilot plant scale, incomplete system components, breadboard systems, or may be constructed from boiler plate or other materials not suitable for a commercial product.
  10. Hardware is subject to continuing modification, may be destroyed in testing or scrapped upon completion.
  11. Except for life performance demonstration, tests are usually for short duration or at reduced operating levels.

 (Added 4/22/80)

 Fleet Vehicle. "Fleet Vehicles" are gasoline powered motor vehicles as defined by the Motor Vehicle Code, Division I, Section 416 of the State of California Vehicle Code and operated from one business or governmental entity.

 (Added 6/25/74)

 Frost Protection. "Frost Protection" means the protection of agricultural crops against damage from frost or cold weather.


Gasoline. "Gasoline" means any petroleum distillate having a Reid vapor pressure of 4.0 pounds per square inch or greater, which is sold or intended for sale for use in motor vehicles or engines and is commonly or commercially known or sold as gasoline. 

 (Added 5/23/72)

Hazardous Material. "Hazardous Material" means dangerous, poisonous, corrosive, oxidizing, volatile, flammable, explosive or toxic materials for which Federal, State or Ventura County industrial safety or other limits have been established. 

 (Added 5/23/72)

Loading Facility. "Loading Facility" shall mean any aggregation or combination of organic liquid loading equipment which is located so that all the organic liquid loading outlets for such aggregation or combination of loading equipment can be encompassed within any circle of 300 feet in diameter. 

 (Added 6/25/74)

 Major Source. A stationary source which emits or has permitted emissions of 25 or more tons per year of an air contaminant.

 (Added 6/19/79, Revised 1/10/84)

 Modified Emissions Unit:

  1. Any physical change to any emissions unit, which would result in an emission increase or for which an application to bank emission reduction credits is submitted to the District, or
  2. Any change in method of operation of any emissions unit, which would result in an emission increase or for which an application to bank emission reduction credits is submitted to the District, or
  3. Any change in hours of operation or throughput, which would result in an emission increase and would necessitate a revision to a permit condition, or for which an application to bank emission reduction credits is submitted to the District.
  4. Notwithstanding the previous paragraph of this subsection, prior to December 31, 1992, an emissions unit will not be considered to be modified if an application to increase the throughput or hours of operation of an emissions unit is submitted and the following conditions are satisfied:
    1. The requested throughput is no more than 1.2 times an actual throughput of the emissions unit during any 12 month consecutive period since January 10, 1984, or
    2. The requested hours of operation are no more than 1.2 times the number of hours of operation of the emissions unit during any 12 month consecutive period since January 10, 1984, and
    The requested throughput or hours of operation will not cause the violation of any applicable federal, state or district laws, rules, regulations, agreements or orders, including any permit conditions applied pursuant to Rule 29.A.
  5. A change in ownership, or routine maintenance or repair, shall not be considered a physical change or change in method of operation.

 (Added 10/22/91)

Motor Vehicle. "Motor Vehicle" is a vehicle which is self-propelled as defined in the California Vehicle Code, Division I, Section 415. 

 (Added 6/25/74)

Noxious Mist. "Noxious Mist" means a mist which is harmful, destructive, distasteful, obnoxious, offensive, or injurious to physical or mental health.


Non-Mobile Equipment. "Non-Mobile Equipment" is equipment which does not need to be registered under the Vehicle Code of the State of California

 (Added 5/23/72)

Opacity. "Opacity" means the degree to which emissions reduce the transmission of light and obscure the view of the background. 

 (Added 5/23/72)

Operation. "Operation" means any physical action resulting in a change in a location, form, or physical properties of a material or any chemical action resulting in a change in the chemical composition, chemical or physical properties of a material.

Orchard Heater. "Orchard Heater" means any article, machine, equipment or contrivance burning any kind of fuel, which is designed, used, maintained, or capable of being used for protection of agricultural crops against frost or cold weather; provided, however, that the devices which are commonly known as wind machines are not included in the terms "Orchard Heater" or "Heater".


Organic Solvents. "Organic Solvents" are any liquids containing organic compounds which are used as dissolvers, viscosity reducers or cleaning agents. These liquids are principally derived from petroleum and include petroleum distillates, chlorinated hydrocarbons, chlorofluorocarbons, ketones, and alcohols. Solutions, emulsions, and dispersions of water and soap, or water and detergent are not organic solvents. Soaps and detergents are water based surfactants. 

 (Revised 5/8/90)

Outer Continental Shelf Area (OCS). "Outer Continental Shelf Area" means any offshore waters for which the District has been designated the corresponding onshore area by the U.S. Environmental Protection Agency, Anacapa Island, and San Nicolas Island 

 (Added 1/10/84, Revised 1O/22/9l).

Particulate Matter. "Particulate Matter" means any material except uncombined water which exists in a finely divided form and is a liquid or solid at standard conditions. Dust shall also be considered as particulate matter. 

 (Revised 5/23/72)

 Particulate Matter (PM10). "Particulate matter (PM10)" means particulate matter with an aerodynamic diameter equal to or less than 10 micrometers.

 (Added 10/22/91)

Permit to Operate. "Permit to Operate" means a written permit issued by the Ventura County Air Pollution Control District for the operation of any facility, article, machine, equipment, or other contrivance the use of which may cause the issuance, reduction, control, or elimination of air contaminants

 (Added 5/23/72).

Permitted Emissions. "Permitted Emissions" means those emissions which are imposed on a Permit to Operate limiting the maximum quantity of each air pollutant which a source can emit. These limits shall be expressed in pounds per hour, and tons per year. Permitted emissions shall be determined pursuant to Rule 29.B.

 (Added 6/19/79, Revised 10/22/91)

Person. "Person" means any person, corporation, government agency, public officer, association, joint venture, partnership or any combination of such, jointly or separately, operating in concert for any common objective related to the purposes of this Regulation. It includes the owner, lessor, lessee, tenant, licensee, manager, and operator, or any of such, of an emission point or any source operation related thereto, or of any interest in such emission point or source operation. 

 (Revised 5/23/72)

Photochemically Reactive Solvent. "Photochemically Reactive Solvent" is any solvent with an aggregate of more than 20 percent of its total volume composed of the chemical compounds classified below or which exceeds any of the following individual percentage composition limitations referred to the total volume of solvent:

  1. A combination of hydrocarbons, alcohols, aldehydes, esters, or ketones having an olefinic or cyclo-olefinic type of unsaturation: 5 percent;
  2. A combination of aromatic compounds with eight or more carbon atoms to the molecule except ethylbenzene: 8 percent.

 (Added 5/23/72)

 PPM. "PPM" means parts per million by volume.

 (Added 5/23/72)

Process Weight. "Process Weight" means the total weight of all materials introduced into a source operation including solid fuels, but excluding combustion air and liquids and gases used solely as fuels or as a means of conveyance. Liquids and gases shall be included only in the process weight to the extent that they chemically react in the formation of the final product or to the extent that they remain in combined form as an integral part of the final product. Process weight rate means a rate established as follows:

  1. For continuous or long run steady state source operation, the total process weight for the entire period of continuous operation or for a typical portion thereof, divided by the number of hours of such period or portion thereof.
  2. For cyclical or batch source operation, the total process weight for a period which covers a complete operation or integral number of cycles, divided by the hours of actual process operation during such periods, excluding any time during which the equipment is idle. 

  (Revised 5/23/72)

Public Record. "Public Record" means any record made available to the public by law containing information relating to the conduct of the publics business that is pre 

 (Added 1/29/74)

Reactive Organic Compounds. "Reactive Organic Compounds" (ROC) is any compound containing at least one atom of carbon except those compounds identified in this Rule as Exempt Organic Compounds. This term and definition shall replace the following terms and definitions wherever they appear in the Districts Rules and Regulations: organic compound, organic gases, organic liquid, organic materials, organic vapor, volatile organic compounds and hydrocarbons. 

 (Revised 11/3/81, 1/28/92, 5/12/92)

Record. "Record" means 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 combinations thereof, and all papers, maps, magnetic or paper tapes, photographic films and prints, magnetic or punched cards, discs, drums, and other documents. 

 (Added 1/29/74)

Reduction of Animal Matter. "Reduction of Animal Matter" means processing animal matter by any process, including rendering, cooking, drying, dehydration, digestion, evaporation, and protein concentration but not including any processing of food for human consumption. 

 (Revised 5/23/72)

 Regulation. "Regulation" means one of the major categories of the rules of the Air Pollution Control District of Ventura County.
Rule. "Rule" means a rule of the Air Pollution Control District of Ventura County.


Schedule of Increments of Progress. "Schedule of Increments of Progress" means a statement of dates when various steps are to be taken to bring a source of air contaminants into compliance with emission standards and shall include, to the extent feasible, the following:

  1. The date of submittal of the final plan for the control of emissions of air contaminants from that source to the Air Pollution Control District.
  2. That date by which contracts for emission control systems or process modifications will be awarded, or the date by which orders will be issued for the purchase of component parts to accomplish emission control or process modification.
  3. The date of initiation of on-site construction or installation of emission control equipment or process change.
  4. The date by which on-site construction or installation of emission control equipment or process notification is to be completed.
  5. The date by which final compliance is to be addressed.
  6. Such other dates by which other appropriate and necessary steps shall be taken to permit close and effective supervision of progress toward timely compliance. 

 (Added 8/17/76)

Section. "Section" means the section of the Health and Safety Code of the State of California unless some other regulation is specifically indicated. 

 (Revised 5/23/72)

Solid Particulate Matter. "Solid Particulate Matter" includes any material which is or would become solid at standard conditions of temperature and pressure. 

 (Added 5/23/72, Revised 7/18/82)

Source Operation. "Source Operation" means the last operation preceding the emission of an air contaminant which operation:

  1. Results in a separation of the air contaminants in the process material or in the conversion of the process materials into air contaminants as in the case of combustion of fuel, and,
  2. Is not an air pollution abatement operation.


Standard Conditions. "Standard Conditions" means a gas temperature of 70 degrees Fahrenheit (21.1 degrees Centigrade) and a gas pressure of 14.7 pounds per square inch (760 mm. Hg) absolute. Results of all analyses and tests shall be calculated and reported at this gas temperature and pressure unless otherwise called for.

 (Revised 5/23/72)

 Startup. "Startup" means the setting in operation of an affected facility for any purpose.

 (Added 5/23/72)

Stationary Source. Any building, structure, facility, or installation which emits or may emit any affected pollutant directly or as a fugitive emission.

"Building, structure, facility, or installation" means all pollutant emitting activities, including activities located in California coastal waters adjacent to the District boundaries, which:

  1. belong to the same industrial grouping, and
  2. are located on one or more contiguous or adjacent properties (except for activities located in coastal waters), and
  3. are under the same or common ownership, operation, or control or which are owned or operated by entities which are under common control.

Pollutant emitting activities shall be considered as part of the same industrial grouping if they belong to the same two-digit Standard Industrial Classification code, or if they are part of a common production process. (Common production process includes industrial processes, manufacturing processes, extractive processes, and any connected processes involving a common raw material or product.) 


"California Coastal Waters" means that area between the California coastline and a line starting at the California-Oregon border at the Pacific Ocean

thence to 42.0 north, 125.5 west

thence to 41.0 north, 125.5 west

thence to 40.0 north, 125.5 west

thence to 39.0 north, 125.0 west

thence to 38.0 north, 124.5 west

thence to 37.0 north, 123.5 west

thence to 36.0 north, 122.5 west

thence to 35.0 north, 121.5 west

thence to 34.0 north, 120.5 west

thence to 33.0 north, 119.5 west

thence to 32.5 north, 118.5 west

and ending at the California-Mexico border at the Pacific Ocean. 

  (Added 1/10/84)

 "Cargo Carriers" includes trains dedicated to a specific source, and marine vessels. The emissions from all marine vessels which load or unload at the source shall be considered as emissions from the stationary source while such vessels are operating in District waters and in California coastal waters adjacent to the District. The emissions from vessels shall include reactive organic compound vapors that are displaced into the atmosphere; fugitive emissions; combustion emissions in District waters; and emissions from the loading and unloading of cargo. The emissions from all trains dedicated to a specified stationary source, while operating in the District, including directly emitted and fugitive emissions, shall be considered as emissions from the stationary source.

  (Added 1/10/84)

"Common operations" includes operations which are related through dependent processes, storage, or transportation of the same or similar products or raw material. The emissions within District boundaries and California coastal waters from cargo carriers associated with the stationary source shall be considered emissions from the stationary source. 


"Contiguous Property" means two or more parcels of land with a common boundary or separated solely by a private roadway or other public right-of-way. 

 (Added 1/10/84)

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

(Added 5/23/72, Revised 6/20/78, 6/19/79, 1/10/84, 11/19/85, 10/22/91) 

 B. Except as otherwise specifically provided in these Rules and except where the context otherwise indicates, abbreviations used in these Rules are as follows:

B.T.U. - British Thermal Unit(s)
cal. - calorie(s)
c.f.m. - cubic feet per minute
CO - carbon monoxide
CO2 - carbon dioxide
g. - gram(s)
gr. - grain(s)
Hg. - mercury
H2S - hydrogen sulfide
hr. - hour
in. - inch(es)
l. - liter(s)
lb. - pound(s)
mg. - milligram(s)
min. - minute
ml. - milliliter(s)
mm. - millimeter(s)
NO - nitric oxide
NO2 - nitrogen dioxide
NOx - oxides of nitrogen
% - percent
ppm - part(s) per million
s.c.f. - standard cubic feet
s.c.f.m. - standard cubic feet per minute
SO2 - sulfur dioxide
vol. - volume
M or K - thousand(s)
MM - million(s)

 (Adopted 5/23/72, Revised & Renumbered 11/21/78)