I-2 Mendocino County Air Quality Management District Re gulation 1 RULE 1-130 - DEFINITIONS

Except as otherwise specifically provided in these rules and regulations, words used in these rules and regulations are used in exactly the same sense as the same words are used in the federal Clean

Air Act Amendments of 1990 and as amended at the ti me of application, Title 40 of the Code of Federal Regulations, Part 52.21, and Division 26 of the State of California Health and Safety Code. Where Title 40 of the Code of Federal Regulations, Part 52.21 refers to the responsibilities of the

Administrator of the U.S. Environmental Protection Agency, the term Administrator shall be

construed to mean Air Pollution Control Officer. [Amended 5/6/03, Amended 12/5/06, Amended 2/15/11]

(a1) Agricultural Operation:

The growing and harvesting of crops, or the raising of fowl, animals or bees as a gainful occupation, or forest management, or range improvem ent or in the improvement of land for wildlife and game habitat, or disease or pest preve ntion.

(a2) Air Contaminant:

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

(a3) Air Pollution Abatement Operation:

Any operation that has as its essential purpose a s ignificant reduction in the emission of air

contaminants or the effect of such emission.

(a4) Air Pollution Control Officer (APCO):

The Air Pollution Control Officer of the District

(a5) Ambient Air Quality Standard:

The specific concentrations and durations of air po llutants that reflect the relationship between intensity and composition of pollution to u ndesirable effects.

(a6) Approved Combustibles:

Brush, trees, and other vegetation grown on the pro perty where it is to be burned.

(b1) Baseline Concentration:

That ambient concentration level which exists in th e baseline area at the time of the establishment of the applicable baseline date as de termined in accordance with Section 52.21 of the Code of Federal Regulations. (40 CFR 52.21(b )(13))I-3 Mendocino County Air Quality Management District Re gulation 1 (b2) Best Available Control Technology (BACT):

An emissions limitation based on the maximum degree of reduction of each air contaminant subject to regulation under the federal Clean Air A ct Amendments of 1990 and as amended at the time of application emitted from or that result s from any stationary or portable source or modification, which the Air Pollution Control Offic er, on a case by case basis, taking into account energy, environmental, and economic impacts and other costs, determines is achievable for such stationary source through appli cation of production processes and available methods, systems, and techniques for cont rol of such air contaminants. Said BACT determinations may include a design standard, opera tional equipment specifications, fuel restrictions, work practice or combination thereof. In no event shall application of BACT result in emissions of any pollutants that will exc eed the emissions allowed under Rules 1-490 and 1-492 of this regulation. If the reviewing aut hority determines that technological or economic limitations on the application of measurem ent methodology to a particular emissions unit would make the imposition of an emis sions standard infeasible, a design, equipment, work practice, operational standard or c ombination thereof, may be prescribed instead to satisfy the requirements for the applica tion of BACT (40 CFR 52.21(b)(12)).

The BACT process shall be applied to any air contam inants that have been identified as toxic air contaminants (TAC) by the U.S. Environmental Pr otection Agency, the California Air Resources Board or the Mendocino County Air Quality Management District Board.

[(b2) Paragraph 2 is not included as part of the SI P]

(c1) CAAA:

The Federal Clean Air Act Amendments of 1990, as am ended at the time of application.

(c2) CAPCOA:

California Air Pollution Control Officer’s Associat ion

(c3) CCAA:

California Clean Air Act

(c4) CFR:

Code of Federal Regulations

(c5) Combustion Contaminants:

Matter discharged into the atmosphere from the burn ing of any kind of material, excluding

carbon dioxide and water.

(c6) Compression Ignition (CI)

Compression ignition internal combustion engine.I-4 Mendocino County Air Quality Management District Re gulation 1 (c7) Control Strategy:

A combination of measures designed to reduce air co ntaminant emissions in accordance with the State Implementation Plan for the Mendocino Cou nty Air Quality Management District.

(d1) District:

The Mendocino County Air Quality Management Distric t as required by California Health and Safety Code, Section 40002 or a multi-county un ified district authorized by Chapter 3, Part 3, Division 26, of said code.

(d2) Dust:

Minute solid particles released into the air by nat ural forces or by mechanical processes such as grading, crushing, grinding, milling, drilling, demolishing, shoveling, conveying, bagging, sweeping, etc.

(e1) Emissions:

The act of passing into the atmosphere an air conta minant or gas stream that contains an air contaminant, or the air contaminant so passed into the atmosphere.

(e2) Episode Alert:

A condition in an air basin whenever the concentrat ion of any air contaminant in that air basin has been verified to have reached a predetermined l evel that threatens the ambient air quality standard as defined in Rule 1-160 depending upon th e particular topography and meteorology of the air basin. "Verified" means the pertinent me asuring instrument has been checked over the following fifteen-minute period and found to be operating correctly.

(f1) Fumes:

"Fumes" means vapors, mists, and airborne liquid or solid particulate matter or any combination including these.

(g1) Geothermal Operations:

Those activities related to the extraction, transmi ssion, and utilization of geothermal steam that may directly, or indirectly, result in air con taminant emissions.

(g2) Greenhouse Gases (GHGs):

A gas that has the capacity to create a warming eff ect in the earth’s atmosphere; for the purposes of this rule: carbon dioxide (CO2), nitrou s oxide (N2O), methane (CH4), hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulfur hexafluoride (SF6). [Added 2/15/11]I-5 Mendocino County Air Quality Management District Re gulation 1 (h1) Hearing Board:

The appellate review board of the Mendocino County Air Quality Management District as provided for by Section 40800 of the California Hea lth and Safety Code.

(i1) Impact/Baseline Area:

That area where the concentration of emissions from a proposed source is predicted to be 1 ug/m3 or greater, using an Environmental Protection Agency approved ambient air quality

model.

(i2) Indirect Source:

A facility, building, structure or installation, or combination thereof, that indirectly results in, or is projected to result in unmitigated emissions in excess of the following: ROG – 180 lbs/day, NOx – 42 lbs/day, CO – 690 lbs/day, PM10 – 80 lbs/day. Projected unmitigated emissions are to be generated using the latest ARB approved version of URBEMIS with the Mountain and Rural Counties default settings, or ot her ARB approved indirect source model. In any model the latest available fleet, meteorolog y, and trip generation information will be used and the model run for each season. [Amende d 5/6/03]

(i3) Installation:

The placement, assemblage or construction of equipm ent or control apparatus at the premises where the equipment or control apparatus will be us ed, and includes all preparatory work at such premises.

(l1) Large Grading Operation:

A grading activity involving more than one (1) acre of exposed soil or more than one (1) mile of road during any single calendar year. [Added 12/5/06] (m1) Major Modification:

“Major Modification” as it applies to gasoline disp ensing facilities means the addition, replacement, or removal of an underground storage t ank, underground piping, vapor piping within a dispenser, or a dispenser of an existing i nstallation. The replacement of a dispenser is not a major modification when the replacement is occasioned by end user damage to a dispenser.

(m2) Maximum Achievable Control Technology (MACT):

An emissions limitation which is not less stringent than the emissions limitation achieved in practice by the best controlled similar source, and which reflects the maximum degree of reduction in emissions that the permitting authorit y, taking into consideration the cost of achieving such emission reduction, and any non-air quality health and environmental impacts and energy requirements, determines is achievable b y the source.I-6 Mendocino County Air Quality Management District Re gulation 1 (m3) Modeling:

A procedure for estimating the ambient air concentr ation of air contaminants based upon emission profiles, dispersion simulations or other techniques approved by the U.S. Environmental Protection Agency, the California Air Resources Board and/or the Mendocino County Air Pollution Control Officer.

(m4) Modification:

"Modification" means any change in the structure, l ocation, operation, conditions of operation, process materials or fuel of any station ary source that may increase or decrease the amount of any air contaminant emitted into the atmo sphere by that source, and that is not already specifically allowed by a permit to operate issued by the District. An increase in production rate or in hours of operation beyond lim its set in the permit to operate from the District is a modification. Otherwise, an increase or decrease in production rate or in hours of operation is not a modification.

(n1) Net Increase in Emissions:

The amount by which the sum of any increase in actu al emissions from a particular physical change or change in method of operation at a statio nary source, and any other increases and

decreases in actual emissions at the source that ar e creditable in accordance with 40 CFR 52.21(b)(3) and (21), exceeds zero.

(o1) Operation:

Any physical action resulting in a change in the lo cation, form or physical properties of a material, or any chemical action resulting in a cha nge in the chemical composition or the chemical or physical properties of a material.

(o2) Orchard, Vineyard, or Citrus Grove Heater:

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

(o3) Organic Gas:

Any molecular gas containing carbon and hydrogen, o r carbon and hydrogen in combination with any other element.

(o4) Owner:

Includes, but is not limited to, any person who lea ses, supervises or operates equipment, in addition to the normal meaning of ownership.I-7 Mendocino County Air Quality Management District Re gulation 1 (p1) Particulate Matter:

Any material, except uncombined water, that exists in a finely divided form as a liquid or solid at standard conditions. Specific size fracti ons of particulate matter are defined as

follows:

1. PM 2.5 means particulate matter, both filterable and cond ensable, with an

aerodynamic diameter less than or equal to a nomina l two and one half (2.5)

micrometers.

2. PM 10 means particulate matter, both filterable and conde nsable, with an

aerodynamic diameter less than or equal to a nomina l ten (10) micrometers. [Amended 2/15/11]

(p2) Permit:

Refers to either an Authority to Construct, Tempora ry Permit to Operate or Permit to Operate, whichever is legally in effect.

(p3) Person or Persons:

An individual, public or private corporation, polit ical subdivision, agency, board, department or bureau of the state, municipality, partnership, co-partnership, firm, association, trust or estate, or any other legal entity whatsoever that i s recognized in law as the subject of rights

and duties.

(p4) Portable Source:

All units of air contaminant emitting articles, mac hines, equipment or other contrivance that are designed to be moved from location to location, whose emitting source is not the motive power for such moving, and that does not have a val id California Portable Equipment permit.

(p5) Potential to Emit:

The maximum capacity of a stationary source to emit an air contaminant under its physical and operational design, after considering physical and operational limitations that are enforceable by conditions imposed by the District i n both the Authority to Construct and Permit to Operate. (40 CFR 52.21(b)(4))

(p6) PPM:

Parts per million by volume expressed on a dry gas basis.I-8 Mendocino County Air Quality Management District Re gulation 1 (p7) Precursor:

A substance that, when released to the atmosphere, forms or causes to be formed or

contributes to the formation of another or secondar y air pollutant for which a national ambient air quality standard has been adopted, or whose pre sence in the atmosphere will contribute to the violation of one or more national ambient air q uality standards. Presently identified precursors and secondary pollutants are:

Precursors Secondary Pollutants

Volatile Organic Compounds

a) Photochemical oxidants (ozone O 3 )

b) Organic fraction of PM10

Nitrogen Oxides (NOx) a) Photochemical oxidants (Ozone) b) Nitrogen dioxide (NO 2 ) c) Nitrates NO 3 d) Nitrate fraction of PM10 e) Nitrate fraction of PM2.5

Sulfur oxides (SOx) a) Sulfur dioxide (SO 2 ) b) Sulfates (SO 4 ) c) Sulfate fraction of PM10 d) Sulfate fraction of PM2.5 [Amended 2/15/11]

(p7) Prevention of Significant Deterioration (PSD) Increment:

The maximum allowable increase of ambient air quali ty above baseline concentration in the

three classified areas.

Allowable PSD Increments micrograms per cubic meter

Class I Class II Class III

Sulfur Dioxide

Annual Arithmetic Mean 2 20 40

24-hour maximum* 5 91 182

3-hour maximum 25 512 700

Particulate Matter (PM 2.5)

Annual Arithmetic Mean 1 4 8

24-hour maximum* 2 9 18

Particulate Matter PM-10

Annual Arithmetic Mean 4 17 34

24-hour maximum* 8 30 60

Nitrogen Dioxide

Annual

Arithmetic Mean 2.5 25 50

* Not to be exceeded more than once a year.I-9 Mendocino County Air Quality Management District Re gulation 1 (p7) Process Weight Per Hour:

The total weight, including contained moisture of a ll materials introduced into any specific process which may cause any discharge into the atmo sphere. Solid fuels charged will be considered as part of the process weight, but liqui d 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. For continuous processes, the average hourly total weight of mater ials introduced into the process will be

used in calculations.

(s1) Section:

Refers to a section of the Health and Safety Code o f the State of California unless some other statute is specifically mentioned.

(s2) Significant:

The potential of a new or modified source to emit a ir contaminants that would equal or exceed any of the following rates, calculated on the basis of 24-hour emissions profiles, except as

noted otherwise:

Air Contaminant Significant Emissions Rate

Carbon monoxide 550 lbs. per day Nitrogen oxides 220 lbs. per day Sulfur dioxide 220 lbs. per day Particulate matter 135 lbs. per day PM-10 80 lbs. per day PM2.5 54 lbs. per day of direct PM2.5 emissions; 220 lbs. per day of sulfur dioxide emissions; 220 lbs. per day of nitrogen oxide emissions. Ozone 220 lbs. per day of VOCs * or nitrogen ox ides Lead 3 lbs. per day Asbestos .038 lbs. per day Beryllium .002 lbs. per day Mercury 0.5 lbs. per day Vinyl chloride 5.4 lbs. per day Fluorides 16 lbs. per day Sulfuric acid mist 38 lbs. per day Hydrogen sulfide (H2S) 54 lbs. per day Total reduced sulfur (including H 2 S) 54 lbs. per day Reduced sulfur compounds (including H 2 S): .027 lbs. per day Municipal waste combustors: Organic emissions: 3.2 × 10 -6 megagrams per year (3.5 × 10 -6 tonsper year) (measured as total tetra-through octachlorinated dibenzo-p-dioxins and dibenzofurans) Metals emissions: 14 megagrams per year (15 tons pe r year) (measured as particulate matter)I-10 Mendocino County Air Quality Management District Re gulation 1 (s2) Significant (continued):

Acid gas emissions: 36 megagrams per year (40 tons per year) (measured as sulfur dioxide and hydrogen chloride) Municipal solid waste landfills: Nonmethane organic compounds: 45 megagrams per year (50 tons per year)

Greenhouse Gases: For the purpose of Rule 1-220 only: as specified in Rule 1-221.4 (a) or 1-221.4 (c) For the purpose of Regulation 5 only: as specified in Rule 1-221.4 (b) Other pollutants regulated under the Clean Air Act: any emissions rate whatsoever (52.21(b)(23)(ii)).

Hazardous Air Pollutant (HAP) listed pursuant to Section 112(g)

of the federal Clean Air Act

Amendments of 1990 and as amended at the time of application 10 tons per year of any one HAP 25 tons per year for two or more HAPs

* Volatile Organic Compounds except for ethanol sou rces below the EPA yearly threshold (40 tons per year).

Not withstanding the above significant emissions ra tes for various air contaminants, significant also means any net emissions increase f rom any new or modified stationary source

that would be constructed within 10 kilometers of a Class I area and have an air quality impact on such area equal to or greater than 1 micr ogram per cubic meter (24 hour average). (40 CFR 52.21(b)(23)(iii)) The above Significant E missions Rates are not to be used for CEQA determination.

(s4) Stacking:

The venting of geothermal steam from associated uni t steam supply transmission line into the atmosphere during associated power plant shutdowns (outages), startups or load curtailments.

(s5) Standard Conditions:

As used in these regulations, refers to a gas tempe rature of 20 degrees Centigrade (68 degrees Fahrenheit) and a gas pressure of 760 millimeters o f mercury absolute (14.7 pounds per square inch absolute).

(s6) Standard Cubic Meter of Gas (Standard Cubic Fo ot of Gas):

The amount of gas that would occupy the specified c ubic measure, if free of combined water,

at standard conditions.I-11 Mendocino County Air Quality Management District Re gulation 1 (s7) Stationary Source:

All units of air contaminant emitting articles, mac hines, equipment or other contrivances, which are located on adjacent or contiguous propert ies under the control of the same person (or persons under common control) and all of which are determined by the Air Pollution Control Officer to be related to one another throug h a similar product, raw material or

function and are included in the same standard indu strial classification.

(s8) Steam Generating Unit:

Any furnace or boiler used in the process of burnin g fuel for the purpose of producing steam by heat transfer.

(t1) Total Reduced Sulfur (TRS):

"TRS" means total reduced sulfur contained in hydro gen sulfide, mercaptans, dimethyl sulfide, dimethyl disulfide or other organic sulfid e compounds, all expressed as hydrogen sulfide. Sulfur dioxide, sulfur trioxide, or sulfu ric acid mists are not to be included in the

determination of TRS.

(t2) Toxic Air Contaminant:

"Toxic air contaminant" means any substance identif ied by the Air Resources Board as a toxic air contaminant pursuant to California Health and S afety Code, Section 39650 et seq., or listed as a hazardous air pollutant pursuant to Sub section (b) of Section 112 of the federal Clean Air Act (42 U.S.C. Sec. 7412(b)).

(t3) Trade Secrets:

As used in these rules and regulations, Trade Secre ts include, but are not limited to, any formula, pattern, process, tool, mechanism, compoun d, procedure, production data, or compilation of information which is not patented, w hich is known only to certain individuals within a commercial concern who are using it to fab ricate, produce, or compound an article of trade or to perform a service having commercial val ue, and which gives its user an opportunity to obtain a business advantage over com petitors who do not know or use it.

(u1) URBEMIS:

Urban Emissions Model. A CARB approved computer pr ogram that can be used to estimate emissions associated with land development projects in California such as residential neighborhoods, shopping centers, office buildings, and construction projects.