MARIPOSA COUNTY AIR POLLUTION CONTROL DISTRICT
RULE 1002 - DEFINITIONS
The definitions in this rule apply throughout Regulation X and are derived from related provisions of the U.S.
EPA's Title V regulations in Part 70 Code of Federal Regulations (CFR), "State Operating
Permit Programs." The terms defined in this section are italicized throughout Regulation X.
A. Acid Rain Unit An "acid rain unit" is any fossil fuel-fired combustion device that is
an affected unit under 40 CFR Part 72.6 and therefore subject to the requirements of Title IV (Acid Deposition
Control) of the CAA.
[Reference: 40 CFR Part 70.2 Affected Unit]
B. Administrative Permit Amendment An "administrative permit amendment" is an amendment
to a permit to operate which:
- Corrects a typographical error;
- Identifies a minor administrative change at the stationary source; for example, a change in the name,
address, or phone number of any person identified in the permit;
- Requires more frequent monitoring or reporting by an owner or operator of the stationary source;
- Transfers ownership or operational control of a stationary source, provided that, prior to the transfer
the APCO receives a written agreement which specifies a date for the transfer of permit responsibility,
coverage, and liability from the current to the prospective permittee.
[Reference: 40 CFR Part 70.7(d)]
C. Affected State An "affected state: is any state that: 1) is contiguous with California
and whose air quality may be affected by a permit action, or 2) is within 50 miles of the source for which a permit
action is being proposed.
[Reference: 40 CFR 70.2 Affected States]
D. Air Pollution Control Officer (APCO) "Air Pollution Control Officer" refers to
the air pollution control officer of the Mariposa County Air Pollution Control District, or his or her designee.
E. Applicable Federal Requirement An "applicable federal requirement" is any requirement
which is enforceable by the U.S. EPA and citizens pursuant to section 304 of the CAA
and is set forth in, or authorized by, the CAA or a U.S. EPA regulation. An
"applicable federal requirement" includes any requirement of a regulation that becomes effective during
the term of the permit. applicable federal requirements include:
- Title I requirements of the CAA, including:
- New Source Review requirements in the State Implementation Plan approved by the U.S. EPA and
the terms and conditions of the preconstruction permit issued pursuant to an approved New Source Review
- Prevention of Significant Deterioration (PSD) requirements and the terms and conditions of the PSD permit (40
CFR Part 52);
- New Source Performance Standards (40 CFR Part 60);
- National Ambient Air Quality Standards, increments, and visibility requirements as they apply to portable sources
required to obtain a permit pursuant to section 504(e) of the CAA;
- National Emissions Standards for Hazardous Air Pollutants (40 CFR Part 61);
- Maximum Achievable Control Technology or Generally Available Control Technology Standards (40 CFR Part
- Risk Management Plan preparation and registration requirements (section 112(r) of the CAA);
- Solid Waste Incineration requirements (sections 111 or 129 of the CAA);
- Consumer and Commercial Product requirements (section 183 of the CAA);
- Tank Vessel requirement (section 183 of the CAA);
- District prohibitory rules that are approved into the state implementation plan;
- Standards or regulations promulgated pursuant to a Federal Implementation Plan; and
- Enhanced Monitoring and Compliance Certification requirements (section 114(a)(3) of the CAA).
- Title III, section 328 (Outer Continental Shelf) requirements of the CAA (40 CFR Part 55);
- Title IV (Acid Deposition Control) requirements of the CAA (40 CFR Parts 72, 73, 75, 76, 77,
78 and regulations implementing sections 407 and 410 of the CAA);
- Title VI (Stratospheric Ozone Protection) requirements of the CAA (40 CFR Part 82); and
- Monitoring and Analysis requirements (section 504(b) of the CAA).
[Reference: 40 CFR Part 70.2 Applicable Requirement]
F. California Air Resources Board (ARB) "California Air Resources Board" refers to the
Air Resources Board of the State of California.
G. Clean Air Act (CAA) "Clean Air Act" refers to the federal Clean Air Act as amended in
1990 (42 U.S.C. section 7401 et seq.).
H. Code of Federal Regulations (CFR) "Code of Federal Regulations"
refers to the United States Code of Federal Regulations.
I. Commence Operation "Commence operation" is the date of initial operation of an emissions
unit, including any start-up or shakedown period authorized by a temporary permit to operate pursuant to section
42301.1 of the H&SC.
J. Direct Emissions "Direct emissions" are emissions that may reasonably pass through a
stack, chimney, vent or other functionally-equivalent opening.
K. District "District" refers to Mariposa County Air Pollution Control District.
L. Effective Date of Regulation X The "effective date of Regulation X" is the date the
U.S. EPA promulgates interim, partial, or final approval of the rule in the Federal Register.
[Reference: 40 CFR Part 70.4(g)]
M. Emergency An "emergency" is any situation arising from a sudden and reasonably unforeseeable
event beyond the control of a permittee (e.g., an act of god) which causes the exceedance of a technology-based
emission limitation under a permit and requires immediate corrective action to restore compliance. An "emergency"
shall not include noncompliance as a result of improperly designed equipment, lack of preventive maintenance, careless
or improper operation, or operator error.
[Reference: 40 CFR Part 70.6(g)(1)]
N. Emissions Unit An "emission unit" is any identifiable article, machine, contrivance,
or operation which emits, may emit, or results in the emissions of, any regulated air pollutant or hazardous air
[Reference: 40 CFR Part 70.2 emissions unit]
O. Federally-enforceable Condition "A federally-enforceable condition" is any condition
set forth in the permit to operate which addresses and applicable federal requirement or a voluntary emissions
P. fugitive emissions "fugitive emissions" are emissions which could not
reasonably pass through a stack, chimney, vent, or other functionally-equivalent opening. [Reference: 40 CFR
Part 70.2 Fugitive Emissions]
Q. Hazardous Air Pollutant (HAP) A "hazardous air pollutant" is any air pollutant
listed pursuant to section 112(b) of the CAA.
R. Health and Safety Code (H&SC) "Health and Safety Code" refers to the California
Health and Safety Code. S. Initial Permit An "initial permit" is the first operating permit for which
a source submits an application that addresses the requirements of the federal operating permits program as implemented
by Regulation X.
T. Major Source A "major source" is a stationary source which has the potential
to emit a regulated air pollutant or a HAP in quantities equal to or exceeding the lesser
of any of the following thresholds:
- 100 tons per year (tpy) of any regulated air pollutant;
- 10 tpy of one HAP or 25 tpy of two or more HAPs; or
- Any lesser quantity threshold promulgated by the U.S. EPA.
[Reference: 40 CFR Part 70.2 Major Source]
U. Minor Permit Modification A "minor permit modification" is any modification to a
federally-enforceable condition on a permit to operate which: 1) Is not a significant permit modification,
and 2) is not an administrative permit amendment. [Reference: 40 CFR part 70.7(e)(2)]
V. Owner or Operator An "owner or operator" is any person who owns,
leases, operates, controls, or supervises a stationary source.
W. Permit Modification A "permit modification" is any addition, deletion, or revision
to a permit to operation condition.
[Reference: 40 CFR Part 70.2 Permit Modification and Permit Revision]
X. Potential to Emit For the purposes of Regulation X, "potential to emit"
as it applies to an emissions unit and a stationary source is defined below.
- Emissions Unit The "potential to emit" for an emissions unit is the maximum
capacity of the unit to emit a regulated air pollutant or HAP considering the unit's physical and
operational design. Physical and operational limitations on the emissions unit shall be treated as part
of its design, if the limitations are set forth in permit conditions which address applicable federal requirements.
Physical and operational limitations shall include, but are limited to the following: limits placed on emissions
and restrictions on hours of operation and type or amount of material combusted, stored or processed.
- Stationary Source The "potential to emit" for a stationary source is
the sum of the potential to emit from all emissions units at the stationary source. If two
or more HAPs are emitted at a stationary source, the potential to emit for each of those HAPs
shall be combined to determine applicability. Fugitive emissions shall be considered in determining the
potential to emit for: 1) sources as specified in 40 CFR Part 70.2 Major Source (2), and 2) sources
of HAP emissions. Notwithstanding the above, any HAP emissions from any oil or gas exploration or
production well (with its associated equipment) and any pipeline compressor or pump station shall not be aggregated
with emissions of similar units for the purpose of determining a major source of HAPs, whether or
not such units are located in contiguous areas or are under common control.
[Reference: 40 CFR Part 70.2 potential to emit and Major Source (2)]
Y. Preconstruction Permit A "preconstruction permit" is a permit issued prior to construction
which authorized construction:
- Pursuant to a program for the prevention of significant deterioration of air quality required by section 165
of the CAA or Regulation IV; or
- Pursuant to a new source review program required by sections 172 and 173 of the CAA or Regulation IV.
[Reference: 40 CFR Part 70.2 Applicable Requirement (2)]
Z. Regulated Air Pollutant A "regulated air pollutant" is any pollutant: 1) which is emitted
into or otherwise enters the ambient air, and 2) for which the U.S. EPA has adopted an emission limit,
standard, or other requirement.
Regulated air pollutants include:
- Oxides of nitrogen and volatile organic compounds;
- Any pollutant for which a national ambient air quality standard has been promulgated pursuant to section 109
of the CAA;
- Any pollutant subject to a new source performance standard promulgated pursuant to section 111 of the CAA;
- Any ozone-depleting substance specified as Class I (chlorofluorocarbons) or Class II (hydrofluorocarbons) substance
pursuant to Title VI of the CAA; and
- Any pollutant subject to a standard or requirement promulgated pursuant to section 112 of the CAA, including:
- Any pollutant listed pursuant to section 112(r) of the CAA (Prevention of Accidental Releases) shall
be considered a "regulated air pollutant" upon promulgation of the list.
- Any HAP subject to a standard or other requirement promulgated by the U.S. EPA pursuant
to section 112(d) or adopted by the District pursuant to 112(g) and (j) of the CAA shall be considered a
"regulated air pollutant" for all sources or categories of sources: 1) upon promulgation of the standard
or requirement, or 2) 18 months after the standard or requirement was scheduled to be promulgated pursuant to section
112(e)(3) of the CAA.
- Any HAP subject to a District case-by-case emissions limitation determination for a new or modified
source, prior to the U.S. EPA promulgation or scheduled promulgation of an emissions limitation shall
be considered a "regulated air pollutant" when the determination is made pursuant to section 112(g)(2)
of the CAA. In case-by-case emissions limitation determinations, the HAP shall be considered a "regulated
air pollutant" only for the individual source for which the emissions limitation determination was made. [Reference:
40 CFR Part 70.2 Regulated Air Pollutant]
AA. Responsible Official A "responsible official" is an individual with the authority to
certify that a source complies with all applicable federal requirements and federally-enforceable conditions
of permits issued to sources in accordance with Regulation X. "Responsible official" means one of the
- For a corporation, a president, secretary, treasurer, or vice-president of the corporation in charge of a principal
business function, or any other person who performs similar policy or decision-making functions for the corporation,
or a duly authorized representative of such person if the representative is responsible for the overall operation
of one or more manufacturing, production, or operating facilities applying for or subject to a permit and either:
- The facilities employ more than 250 persons or have gross annual sales or expenditures exceeding $25 million
(in second quarter 1980 dollars); or
- The delegation of authority to such representative is approved in advance by the APCO;
- For a partnership or sole proprietorship, a general partner of the proprietor, respectively;
- For a municipality, state, federal, or other public agency, either a principal executive officer or a ranking
elected official; or
- For an acid rain unit subject to Title IV (Acid Deposition Control) of the CAA, the "responsible
official" is the designated representative of that unit for any purposes under Title IV and Regulation X.
[Reference: 40 CFR Part 70.2 Responsible Official]
BB. Significant Permit Modification A "significant permit modification" is any modification
to a federally-enforceable condition on a permit to operate which:
- Involves any modification under section 112(g) of Title I of the CAA or under U.S. EPA
regulations promulgated pursuant to Title I of the CAA, including 40 CFR Parts 51, 52, 60, 61 and
- Significantly changes monitoring conditions;
- Provides for the relaxation of any reporting or recordkeeping conditions;
- Involves a permit term or condition which allows a source to avoid an applicable federal requirement,
including: 1) a federally-enforceable voluntary emissions cap assumed in order to avoid triggering a modification
requirement of Title I of the CAA, or 2) an alternative HAP emission limit pursuant to section 112(i)(5)
of the CAA;
- Involves a case-by-case determination of any emission standard or other requirement; or
- Involves a source-specific determination for ambient impacts, visibility analysis, or increment analysis on
[Reference: 40 CFR Part 70.7(e)(2) and (4)]
CC. Solid Waste Incinerator A "solid waste incinerator" is any incinerator which burns
solid waste material from commercial, industrial, medical, general public sources (e.g., residences, hotels, motels),
or other categories of solid waste incinerators subject to a performance standard promulgated pursuant to sections
111 or 129 of the CAA.
The following incinerators are excluded from the definition of "solid waste incinerator" for the purpose
of Regulation X.
- Any hazardous waste incinerator required to obtain a permit under the authority of section 3005 of the Solid
Waste Disposal Act (42 U.S. C. section 6925);
- Any materials recovery facility which primarily recovers metals;
- Any qualifying small power production facility as defined in 16 U.S.C.A. section 796(17)(C);
- Any qualifying cogeneration facility which burns homogenous waste for the production of energy as defined in
16 U.S.C.A. section 796(18)(B); or
- Any air curtain incinerator which burns only wood, yard, or clean lumber waste and complies with the opacity
limitations to be established by the Administrator of the U.S. EPA
DD. Stationary Source For the purposes of Regulation X, a "stationary source"
is any building, structure, facility, or installation (or any such grouping) that:
- Emits, may emit, or results in the emissions of any regulated air pollutant or HAP;
- Is located on one or more contiguous or adjacent properties;
- Is under the ownership, operation, or control of the same person (or persons under common control) or entity;
- Belongs to a single major industrial grouping; for example, each building, structure, facility, or installation
in the grouping has the same two-digit code under the system described in the 1987 Standard Industrial Classification
[Reference: 40 CFR Part 70.2 Stationary Source]
EE. United States Environmental Protection Agency (U.S. EPA)
"United States Environmental Protection Agency" refers to the Administrator or appropriate delegee of
the "United States Environmental Protection Agency."
FF. Voluntary Emissions Cap A "voluntary emissions cap" is an optional, federally-enforceable
emissions limit on one or more emissions unit(s) which a source assumes in order to avoid an applicable
federal requirement. The source remains subject al all other applicable federal requirements.