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 the Health and Safety Code of the State of California.

Air Contaminant or Pollutant.

Any discharge, release, or other propagation into the atmosphere directly, or indirectly, caused by man and includes, but is not limited to, smoke, dust, charred paper, soot, grime, carbon, noxious acids, fumes, gases, odors, or particulate matter, or any combination thereof.

Air Pollution Control Officer.

The Air Pollution Control Officer of the Air Pollution Control District of Tuolumne County.

Allowable Emissions.

The emission rate calculated using the maximum design capacity of the source unless the source is subject to Permit to Operate conditions which limit the operating rate or hours of operation, or both, which is the most stringent of applicable emission limitations contained in these Rules and Regulations or the emission rate, if any, specified as a Permit to Operate condition.


Any addition to, enlargement of, replacement of, or any major modification or change of the design, capacity, process, or arrangement, or any increase in the connected loading of equipment or control apparatus, which will significantly increase or affect the kind or amount of air contaminants emitted.


The California Air Resources Board, or any person authorized to act on its behalf.


The air that envelops or surrounds the earth. Where air pollutants are emitted into a building not designed specifically as a piece of air pollution control equipment, such emissions into the building shall be considered to be an emission into the atmosphere.

Attainment Pollutant.

A criteria pollutant in an Air Pollution Control District or sub-District zone designated by the Environmental Protection Agency as an attainment area or unclassified area for such pollutant.

Baseline Concentration.

The ambient concentration level reflecting actual air quality as monitored or modeled as of (1) January 1, 1981, minus any contribution from major stationary facilities and major modifications on which construction commenced on or after January 5, 1975, for attainment pollutants; and (2) the date an application for an Authority to Construct is deemed complete by the Air Pollution Control Officer for nonattainment pollutants.

Best Available Control Technology.

An emission limitation, based on the maximum degree of reduction for a criteria pollutant or precursor which would be emitted from any source or modification which the Air Pollution Control Officer, on a case-by-case basis, taking into account energy, environmental and economic impacts, and other costs, determines is achievable for such source or modification through application of production processes or available control methods, systems, and techniques, for such pollutant. In no case shall application of best available control technology result in emissions of any pollutant or precursor which would exceed the emissions allowed by 40 CFR Part 60 and 61. If the Air Pollution Control Officer determines that technological or economic limitations on the application of measurement technology to a particular class of sources would make the imposition of an emission standard infeasible, he may instead prescribe a design equipment, work practice or operations standard, or combination thereof. Such standard shall, to the degree possible, set forth the emission reduction achievable by implementation of such design, equipment, work practice or operation and shall provide for compliance by means which achieve equivalent results.


The Tuolumne County Air Pollution Control Board.

Breakdown Condition.

An unforeseeable failure or malfunction of (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, where such failure or malfunction:

  1. Is not the result of neglect or disregard of any air pollution control law or rule or regulation; and
  2. Is not intentional or the result of negligence; and
  3. Is not the result of improper maintenance; and
  4. Does not constitute a nuisance; and
  5. Is not a recurrent breakdown of the same equipment.

Combustion Contaminant.

Any particulate matter discharged into the atmosphere from the burning of any material which contains carbon in either the free or combined state.

Condensed Fumes.

Particulate matter generated by the condensation of vapors evolved after the volatilization from the molten liquid state, or generated by sublimation, distillation, calcination or chemical reaction, when these processes create airborne particles.

Criteria Pollutant.

An air pollutant regulated by a national ambient air quality standard contained within 40 CFR Part 50.


Is the Air Pollution Control District of Tuolumne County.


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.


The act of releasing or discharging air contaminants into the ambient air from any source.

Emission Data.

Are measured or calculated concentrations or weights of air contaminants emitted into the ambient air. Production data used to calculate emission data are not emission data.

Emission Point.

The place, located in a horizontal plane and vertical elevation, at which an emission enters the atmosphere.


Any source or collection of sources of air contaminants which are located on one or more contiguous or adjacent properties within the District and which is owned, operated, or under shared entitlement to be used by the same person. Items of air contaminant emitting equipment shall be considered aggregated into the same facility and items of non-air contaminant emitting equipment shall be considered associated with air contaminant emitting equipment only if:

  1. The operation of each item of equipment is dependent upon, or affects the process of, the others; and
  2. The operation of all such items of equipment involves a common raw material or product.

Federal Land Manager.

The Secretary of the United States Department with authority over applicable federal lands, his authorized representative, or the President of the United States.


Any duct or passage for air, gases, or the like, such as a stack or chimney.

Fossil Fuel-Fired Generator.

Means a furnace or boiler used in the process of burning fossil fuel for the primary purpose of producing steam by heat transfer. "Fossil fuel" means natural gas, petroleum, coal, and any form of solid, liquid, or gaseous fuel derived from such materials.

Fugitive Dust.

Solid particulate matter that becomes airborne, other than that emitted from an exhaust stack, as a direct result of operation of a facility.

Hearing Board

The appellate review board of any county or regional air pollution control district as provided for in the Health and Safety Code of the State of California.


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 removal.


Means any furnace or other closed fire chamber used to dispose of combustible waste by burning and from which the products of combustion are directed through a flue or chimney.


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.

Institutional Facility.

Means any hospital, boarding home, school, or like facility.

Lowest Achievable Emission Rate.

For any source, the most stringent of:

  1. The most effective emission limitation which the Environmental Protection Agency certified is contained in the implementation plan of any state approved under the Clean Air Act for such class or category of source, unless the owner or operator of the proposed source demonstrates to the satisfaction of the Air Pollution Control Officer that such limitation is not achievable; or
  2. The most effective emissions control technique which has been achieved in practice, for such category or class of source; or
  3. Any other emission control technique found, after public hearing, by the Air Pollution Control Officer to be technologically feasible and cost effective for such class or category of sources or for a specific source.

In no event shall the application of lowest achievable emission rate allow for emissions in excess of those allowable under 40 CFR Part 60.

Major Facility.

Any facility which actually emits or has the potential to emit, when operating at maximum design capacity, 100 tons per year or 1000 pounds per day, or more, or a criteria pollutant or precursor.

Major Modification.

Any modification of a facility which increases the actual emission or potential to emit a criteria pollutant or precursor by 100 tons per year or 1000 pounds per day or more. Emission increases shall include all accumulated increases in actual emissions or potential to emit at the facility since January 1, 1981, or since the date of issuance of the most recent Authority to Construct for initial construction or major modification of the facility.


Any physical change in, change in method of operation of, or addition to an existing stationary source, except that routine maintenance or repair shall not be considered to be a physical change. A change in the method of operation, unless previously limited by a Permit to Operate condition, shall not include:

  1. An increase in the production rate, if such increase does not exceed the operating design capacity of the source.
  2. An increase in the hours of operation.
  3. A change in ownership of a source.

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 material to be burned.

Nonattainment Pollutant.

A criteria pollutant in an air pollution control district or sub-district zone designated by the Environmental Protection Agency as a nonattainment area for that pollutant.


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

Orchard or Citrus Heaters.

Any article, machine, equipment, or other contrivance, burning any type of fuel or material capable of emitting air contaminants, used or capable of being used for the purpose of giving protection from frost damage.

Owner or Operator.

Means any person who owns, operates, controls or supervises an affected facility, or a stationary source of which an affected facility is a part.

Particulate Matter.

Is any material except uncombined water, which can exist in a finely divided form as a liquid or solid at standard conditions.


Any person, firm, association, organization, partnership, business trust, corporation, company, contractor, supplier, installer, operator, user or owner, any government agency or public district, or any officer or employee thereof.

Potential to Emit.

The quantity of emissions that a source is capable of emitting at maximum design capacity calculated on the assumption that air pollution control equipment incorporated into the design of the source will function in the manner reasonably anticipated when the calculation is made.


Parts per million by volume expressed on a dried gas basis.


A directly emitted pollutant that, when released into the atmosphere, forms or causes to be formed or contributes to the formation of a secondary pollutant which is a criteria pollutant. The following precursor-pollutant transformations shall be included in the determination of secondary pollutant concentrations: non-methane hydrocarbons - ozone; nitrogen oxides - nitrogen dioxide; sulfur oxides - sulfur dioxide.

Process Weight Per Hour.

The total weight, including contained moisture, of all materials introduced into any specific process, which process may cause 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.)

Public Record.

Means 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 "trade secrets" as defined in Rule 514.C, Regulation V.


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 any combination thereof, and all papers, maps, magnetic or paper tapes, photographic films and prints, magnetic or punched cards, drums, and other documents.

Resource Recovery Facility.

Any facility at which solid waste is processed for the purpose of extracting, converting to energy, or otherwise separating and preparing solid waste for reuse. Energy conversion facilities must utilize solid waste to provide more than 80% of the heat input to be considered a resource recovery facility.

Secondary Emissions.

Emissions within the District from (1) all cargo carriers, excluding motor vehicles as defined in the Vehicle Code, which load or unload at a facility, and (2) all off-site support facilities which would be constructed as a result of construction or modification of a facility.


As used in these Rules and Regulations, unless some other code is specifically mentioned, all section references are to the Health and Safety Code.

Solid Waste Dump.

Means any accumulation for the purpose of disposal of any solid waste.


Any machine, equipment, apparatus, device, process, or combination thereof, which emits, or may emit air contaminants to the atmosphere through a common duct or vent to a single emission point.

Source Operation.

The last operation preceding the emission of an air contaminant, which operation (a) results in the separation of the air contaminants from the process materials, or in the conversion of the process materials into air contaminants, as in the case of combustion of fuel, and (b) is not an air pollutant abatement operation.

Standard Conditions.

As used in these regulations, "Standard Conditions" are a gas temperature of 60 degrees Fahrenheit and a gas pressure of 14.7 pounds per square inch absolute. Results of all analysis and tests shall be calculated and reported at this gas temperature and pressure.

Standard Cubic Foot of Gas.

The amount of gas that would occupy a volume of one (1) cubic foot, if free of water vapor, at standard conditions.

Temporary Source.

Any source or activity causing emissions which operates within a single air pollution control district for less than two (2) years in any ten (10) year period, including, but not limited to, pilot plants, portable facilities and construction activities.

Total Reduced Sulfur (TRS).

Total reduced sulfur contained in hydrogen sulfide, mercaptans, dimethyl sulfide, dimethyl disulfide or other organic compounds, all expressed as hydrogen sulfide. Sulfur dioxide, sulfur trioxide, or sulfuric acid are not to be included in the determination of TRS.