RULE 502 NEW SOURCE REVIEW

 Adopted 11-12-74 

(Amended 05-24-77, 06-19-79, 09-21-93, 11-03-94, 08-09-01, 12-09-04)

CONTENTS

100 GENERAL

101 PURPOSE 

102 APPLICABILITY 

110 EXEMPTION, EMERGENCY ELECTRICAL GENERATING EQUIPMENT 

111 EXEMPTION, NOTIFICATION REQUIREMENTS 

112 EXEMPTION, RELOCATED EQUIPMENT 

113 EXEMPTION, REPLACEMENT EQUIPMENT 

114 EXEMPTION, TEMPORARY SOURCES 

115 EXEMPTION, RULE COMPLIANCE 

200 DEFINITIONS

201 ACTUAL EMISSIONS 

202 ACTUAL EMISSION REDUCTIONS 

203 ACTUAL INTERRUPTIONS OF ELECTRICAL POWER 

204 ACTUAL OPERATING DAYS 

205 AFFECTED POLLUTANTS 

206 AMBIENT AIR QUALITY STANDARDS 

207 BEST AVAILABLE CONTROL TECHNOLOGY (BACT) 

208 CALIFORNIA ENVIRONMENTAL QUALITY ACT (CEQA) 

209 CARGO CARRIERS 

210 COMMENCE

211 COMPLETE APPLICATION 

212 CONSTRUCTION

213 CONTIGUOUS PROPERTY

214 COST-EFFECTIVE 

215 ELECTRICAL POWER PLANT 

216 EMISSION DECREASE 

217 EMISSIONS LIMITATION 

218 EMISSIONS UNIT 

219 FUGITIVE EMISSIONS 

220 HALOGENATED HYDROCARBONS 

221 HAZARDOUS AIR POLLUTANT (HAP) 

222 HISTORIC ACTUAL EMISSIONS 

223 HISTORIC POTENTIAL EMISSIONS 

224 LAKE TAHOE AIR BASIN

225 MAJOR STATIONARY SOURCE 

226 MAJOR MODIFICATION 

227 MODIFICATION 

228 MOUNTAIN COUNTIES AIR BASIN 

229 NONATTAINMENT POLLUTANT 

230 PM10 

231 PORTABLE EQUIPMENT 

232 POTENTIAL TO EMIT 

233 PRECURSOR 

234 PRIORITY RESERVE BANK 

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Placer County APCD 502 - 1 Rules and Regulations
235 PROPOSED EMISSIONS 

236 QUARTERLY

237 QUARTERLY EMISSION LIMITATION 

238 REACTIVE ORGANIC COMPOUND 

239 RECONSTRUCTED SOURCE 

240 REDUCED SULFUR COMPOUNDS 

241 REGULATED AIR POLLUTANT 

242 REPLACEMENT EQUIPMENT 

243 SACRAMENTO VALLEY AIR BASIN 

244 STATIONARY SOURCE (SOURCE OR FACILITY) 

245 TEMPORARY SOURCE 

246 TOTAL REDUCED SULFUR COMPOUNDS 

300 STANDARDS

301 BEST AVAILABLE CONTROL TECHNOLOGY 

302 OFFSET REQUIREMENTS, GENERAL

303 LOCATION OF OFFSETS AND OFFSET RATIOS 

304 INTERPOLLUTANT OFFSETS 

305 EMISSION REDUCTIONS, SHUTDOWNS AND CURTAILMENTS

306 AMBIENT AIR QUALITY STANDARDS 

307 DENIAL, FAILURE TO MEET STANDARDS 

308 CEQA APPLICABILITY 

309 DENIAL, FAILURE TO MEET CEQA 

400 ADMINISTRATIVE REQUIREMENTS

401 COMPLETE APPLICATION 

402 AIR QUALITY MODELS 

403 PRELIMINARY DECISION 

404 PUBLICATION AND PUBLIC COMMENT 

405 PUBLIC INSPECTION 

406 AUTHORITY TO CONSTRUCT, FINAL ACTION 

407 REQUIREMENTS, AUTHORITY TO CONSTRUCT AND PERMIT TO OPERATE 

408 ISSUANCE, PERMIT TO OPERATE 

409 REGULATIONS IN FORCE GOVERN 

410 CALCULATION OF EMISSIONS - BACT 

411 CALCULATION OF EMISSIONS - OFFSETS TRIGGER FOR ROC, NOX AND CO 

412 CALCULATION OF EMISSIONS - OFFSETS TRIGGER FOR SOX AND PM10 

413 CALCULATION OF EMISSIONS - OFFSETS GENERAL 

414 CALCULATION OF EMISSIONS - OFFSETS REQUIRED FOR ROC, NOX AND CO 

415 CALCULATION OF EMISSIONS - OFFSETS REQUIRED FOR SOX AND PM10 

416 POWER PLANTS 

500 MONITORING AND RECORDS 

501 RECORDKEEPING 

502 RECORDKEEPING FOR SOURCES SUBJECT TO RULE 507 

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100 GENERAL

101 PURPOSE: The purpose of this rule is to provide for the review of new and modified

stationary air pollution sources and to provide mechanisms, including emission offsets, by

which authorities to construct for such sources may be granted without interfering with

the attainment or maintenance of ambient air quality standards. 

102 APPLICABILITY: This rule shall apply to all new stationary sources and emissions units

and all modifications to existing stationary sources and emissions units that, after 

construction, emit or may emit any affected pollutants or regulated pollutants to which

Rule 507, FEDERAL OPERATING PERMIT PROGRAM, applies. This rule shall not

apply to prescribed burning of forest, agriculture or range land; open burning in

accordance with District Regulation 3, OPEN BURNING; road construction or any

non-point source common to timber harvesting or agricultural practices. Exemptions

allowed in this Section shall not be used to exempt any stationary source or modification, 

which would be subject to review under U.S. Environmental Protection Agency (EPA) 

regulations or review pursuant to Rule 507, FEDERAL OPERATING PERMIT 

PROGRAM, from permit requirements. The regulations in effect at the time any

application for an Authority to Construct is deemed complete shall apply. 

110 EXEMPTION, EMERGENCY ELECTRICAL GENERATING EQUIPMENT: Except as

otherwise required for sources subject to the requirements of Title V of the Federal Clean

Air Act as amended in 1990 (42 U.S.C. Section 7401 et seq.), and pursuant to Rule 507, 

FEDERAL OPERATING PERMIT PROGRAM, the Air Pollution Control Officer shall

exempt an application from the requirements of Sections 302, and 303, if the emissions 

unit would provide emergency electrical power or if the emissions unit would provide

emergency water pumping for flood control or emergency fire fighting and is not a major 

source or major modification, provided the requirements of Sections 110.1 and 110.2 are

met. This exemption shall not apply to emissions units supplying power to a serving

utility for distribution on the electric transmission grid nor the operation of standby power

sources due to a voluntary reduction in power by the serving utility. 

110.1 Operation for maintenance purposes of internal combustion engines used solely 

as a source of emergency electrical power, not otherwise exempt, shall be limited 

to 100 hours per year, and such maintenance shall be scheduled in cooperation

with the District so as to have no adverse air quality impact or shall mitigate by

emission offsets or onsite reductions so that there is no net increase in 

emissions; and 

110.2 Operation for other than maintenance purposes shall be limited to actual

interruptions of electrical power by the serving utility. Operation shall not exceed 

24 hours without prior authorization by the Air Pollution Control Officer. 

111 EXEMPTION, NOTIFICATION REQUIREMENTS: Except as otherwise required for 

sources subject to the requirements of Title V of the Federal Clean Air Act as amended in

1990 (42 U.S.C. Section 7401 et seq.), and pursuant to Rule 507, FEDERAL

OPERATING PERMIT PROGRAM, the requirements of Sections 403, 404, 405, and 

406.2 relating to notification, publication, and public inspection of Preliminary Decisions;

and notification, publication, and public inspection of final action shall not apply if the

application is for a new or modified stationary source or emissions unit which does not

trigger a requirement for offsets, calculated pursuant to Sections 413, 414, or 415, as 

applicable. 

112 EXEMPTION, RELOCATED EQUIPMENT: The requirements of Sections 302 and 303

shall not apply to relocation of emission units solely within the District and within only one

air basin of which the District is part, and the relocation does not result in an increase in 

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Placer County APCD 502 - 3 Rules and Regulations
emissions. This exemption is subject to the performance of an air quality analysis

pursuant to Section 306. 

113 EXEMPTION, REPLACEMENT EQUIPMENT: The requirements of Sections 302 and

303 shall not apply to replacement equipment, providing the replacement does not result 

in any emissions increase.

114 EXEMPTION, TEMPORARY SOURCES: The requirements of Sections 302 and 303

shall not apply to temporary stationary emission sources, emission units, and portable 

equipment which will be operated on a temporary basis. This exemption is subject to the 

performance of an air quality analysis pursuant to Section 306. 

115 EXEMPTION, RULE COMPLIANCE: The requirements of Sections 302 and 303 shall

not apply to modifications necessary to comply with standards contained in Regulation 2,

PROHIBITIONS. This Section shall not apply to modifications in production rate, hours of

operation, or other changes or additions to existing equipment not necessary for 

compliance with standards contained in Regulation 2, PROHIBITIONS. 

200 DEFINITIONS: Unless otherwise defined below, the terms used in this rule are defined in Rule 

504, EMISSIONS REDUCTION CREDITS; and Rule 507, FEDERAL OPERATING PERMIT 

PROGRAM. 

201 ACTUAL EMISSIONS: Measured or estimated emissions that most accurately represent

the emissions from an emissions unit. Fugitive emissions associated with the emissions 

unit shall be included in the actual emissions of the emissions unit. 

202 ACTUAL EMISSIONS REDUCTIONS: Reductions of actual emissions from an 

emissions unit selected for on-site (internal) or off-site (external) emissions offsets. Actual 

emission reductions shall be calculated, adjusted and certified pursuant to Rule 504,

EMISSION REDUCTION CREDITS, or to applicable federal requirements. 

203 ACTUAL INTERRUPTIONS OF ELECTRICAL POWER: When electrical service is 

interrupted by an unforeseeable event. 

204 ACTUAL OPERATING DAYS: Any day of operation that results in the emission of an

affected pollutant from the emissions unit. 

205 AFFECTED POLLUTANTS: Reactive organic compounds (ROC), nitrogen oxides

(NOx), sulfur oxides (SOx), PM10, carbon monoxide (CO), lead, vinyl chloride, sulfuric

acid mist, hydrogen sulfide, total reduced sulfur, and reduced sulfur compounds, or any 

other pollutant or precursor for which an ambient air quality standard has been

established by the U.S. Environmental Protection Agency or the California Air Resources 

Board. 

206 AMBIENT AIR QUALITY STANDARDS: State and federal ambient air quality standards 

for the purpose of submittal to the U.S. Environmental Protection Agency for inclusion in

the California State Implementation Plan. All references in this rule to Ambient Air

Quality Standards shall be interpreted as National Ambient Air Quality Standards.

207 BEST AVAILABLE CONTROL TECHNOLOGY (BACT):

207.1 For any emissions unit the most stringent of: 

a. The most effective emission control device, emission limit, or technique, 

singly or in combination, which has been required or used for the type of 

equipment comprising such an emissions unit unless the applicant

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demonstrates to the satisfaction of the Air Pollution Control Officer that

such limitations required on other sources have not been demonstrated

to be achievable. 

b. Any alternative basic equipment, fuel, process, emission control device

or technique, singly or in combination, determined to be technologically

feasible and cost-effective by the Air Pollution Control Officer. 

c. For replacement equipment only, the emission limitation that is based on

the maximum degree of reduction achievable, taking into account 

environmental, energy, and economic impacts by each class or category 

of source. 

207.2 In making a BACT determination for a nonattainment pollutant the Air Pollution

Control Officer may consider the overall effect on other nonattainment pollutants. 

In some cases the lowest emission rates may be required for one or more 

nonattainment pollutants at the cost of not achieving the lowest emission rate for 

other nonattainment pollutants. The Air Pollution Control Officer shall discuss 

these considerations in the Preliminary Decision prepared pursuant to Section 

403. 

207.3 Under no circumstances shall BACT be determined to be less stringent than the 

emission control required by an applicable provision of district, state or federal 

laws or regulations unless the applicant demonstrates to the satisfaction of the 

Air Pollution Control Officer that such limitations are not achievable. 

208 CALIFORNIA ENVIRONMENTAL QUALITY ACT (CEQA): The California

Environmental Quality Act, Public Resources Code, Section 21000, et seq. 

209 CARGO CARRIERS: Cargo carriers are trains dedicated to a specific source. 

210 COMMENCE: As applied to construction, means that the owner or operator has all

necessary permits or approvals required under State and Federal air quality control laws, 

District Rules and Regulations, and those air quality control laws and regulations which 

are part of the California State Implementation Plan, and has: 

210.1 Begun, or caused to begin, a continuous program of on-site construction of the

source, to be completed in a reasonable time, or; 

210.2 Entered into binding agreements or contractual obligations which cannot be 

canceled or modified without substantial loss to the owner or operator, to

undertake a program of actual construction of the source to be completed within 

a reasonable time. 

211 COMPLETE APPLICATION: Completeness of an application for an authority to 

construct a new or modified emission unit shall be evaluated on the basis of a list of 

required information which has been adopted by the District pursuant to Article 3, 

Sections 65940 through 65944 of Chapter 4.5 of Division 1 of Title 7 of the California

Government Code as they exist on the date on which the application is received and on

payment of the appropriate fee pursuant to Rule 601, PERMIT FEES. 

212 CONSTRUCTION: Means any physical change or change in the method of operation 

(including fabrication, erection, installation, demolition, or modification of an emissions 

unit) which would result in a change in actual emissions. 

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213 CONTIGUOUS PROPERTY: Two or more parcels of land with a common boundary or

separated solely by a public roadway or other public right-of-way. 

214 COST-EFFECTIVE: A cost per unit of emissions reduction which is lower than or 

equivalent to the maximum unit costs of the same emission reduction through the use of

Best Available Control Technology, calculated in current year dollars, in accordance with

methodology and criteria specified in guidelines developed by the District. 

215 ELECTRICAL POWER PLANT: An electrical generation facility that regularly generates

electricity so the local electric utility can provide its daily energy requirements.

Emergency electrical generating equipment are not considered electrical power plants. 

216 EMISSION DECREASE: Any modification that would result in an emission decrease of 

actual emissions. The emission decrease shall be calculated by subtracting the 

proposed emissions from the historic actual emissions. 

217 EMISSIONS LIMITATION: One or a combination of permit conditions specific to an 

emissions unit that restricts its maximum emissions, at or below the emissions associated

with the maximum design capacity. An emissions limitation shall be: 

217.1 Contained in the latest authority to construct and contained in or enforceable by 

the latest permit to operate for the emission unit, and;

217.2 Enforceable on a daily basis or quarterly basis pursuant to Section 407.2, and; 

217.3 Established pursuant to a permitting action occurring after December 31, 1976. 

Emission limitations should be stated in a manner consistent with testing 

procedures. Emission limitations may be expressed as enforceable design, 

operational, or equipment standard pursuant to Section 407.3. 

218 EMISSIONS UNIT: An identifiable operation or piece of process equipment such as an

article, machine, or other contrivance which controls, emits, may emit, or results in the

emissions of any affected air pollutant, regulated air pollutant or Hazardous Air Pollutant 

(HAP), directly or as fugitive emissions. An emissions unit shall not include the open

burning of agricultural biomass. 

219 FUGITIVE EMISSIONS: Those emissions that could not reasonably pass through a

stack, chimney, vent, or other functionally equivalent opening. Fugitive hazardous air 

pollutant emissions shall be considered when determining whether a source is a major 

stationary source pursuant to Title V of the Federal Clean Air Act as amended in 1990

and Rule 507, FEDERAL OPERATING PERMIT PROGRAM. The fugitive emissions of a

source shall not be considered in determining whether it is a major stationary source 

pursuant to Title V, unless the source belongs to one of the categories of stationary 

sources listed in 40 CFR 70.2, "Definitions", "Major Source" (2). 

220 HALOGENATED HYDROCARBONS: For the purposes of this rule, halogenated 

hydrocarbons are the following: 

220.1 1,1,1-trichloroethane 

220.2 methylene chloride 

220.3 2,2-dichloro-1,1,1-trifluoroethane (HCFC-123) 

220.4 2-chloro-1,1,1,2-tetrafluoroethane (HCFC-124) 

220.5 trichlorofluoromethane (CFC-11) 

220.6 dichlorodifluoromethane (CFC-12) 

220.7 1,1,1-trichloro-2,2,2-trifluoroethane (CFC-113) 

220.8 1-chloro-1,1-difluoro-2-chloro-2,2-difluoroethane (CFC-114) 

220.9 chloropentafluoroethane (CFC-115) 

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Rules and Regulations 502 - 6 Placer County APCD
220.10 pentafluoroethane (HFC-125) 

220.11 1,1,2,2-tetrafluoroethane (HFC-134) 

220.12 tetrafluoroethane (HFC-134a) 

220.13 1,1-dichloro-1-fluoroethane (HCFC-141b) 

220.14 1-chloro-1,1-difluoroethane (HCFC-142b) 

220.15 1,1,1-trifluoroethane (HFC-143a) 

220.16 chlorodifluoromethane (HCFC-22) 

220.17 trifluoromethane (HFC-23)

220.18 1,1-difluoroethane (HFC-152a) 

220.19 The following four classes of perfluorocarbon compounds: 

a. Cyclic, branched, or linear, completely fluorinated alkanes. 

b. Cyclic, branched, or linear, completely fluorinated ethers, with no

unsaturations. 

c. Cyclic, branched, or linear, completely fluorinated tertiary amines

with no unsaturations. 

d. 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 a validated test method which can be used to quantify 

the specific compounds. 

221 HAZARDOUS AIR POLLUTANT (HAP): Any air pollutant listed pursuant to Section

112(b) of the Federal Clean Air Act as amended in 1990 (42 U.S.C. Section 7401 et 

seq.). 

222 HISTORIC ACTUAL EMISSIONS:

222.1 For applications for emissions reductions deemed complete after September 21, 

1993, "historic actual emissions" are the actual emissions for the existing

emissions unit averaged over the consecutive two (2) year period immediately 

preceding the date of application for emission reduction credits. If the last two 

years are unrepresentative of normal source operations as determined by the Air 

Pollution Control Officer, then any two consecutive years of the last five years

that represent normal source operation may be used. 

222.2 For applications for emissions reductions deemed complete prior to September 

21, 1993, "historic actual emissions" are either as calculated in Subsection 222.1, 

above, or, at the option of the applicant and with the approval of the Air Pollution

Control Officer, are the actual emissions for the existing emissions unit averaged 

over the three year period immediately preceding the date of application for 

emission reduction credits. 

222.3 If, at any time during the two or three year period, actual emissions exceeded 

allowed or permitted emission levels, then actual emissions shall be reduced to

reflect emission levels that would have occurred if the unit were in compliance 

with all applicable limitations and rules. 

222.4 Where an emissions unit has been in operation for less than two years, a shorter 

averaging period of at least one year may be used, provided that the averaging

period is representative of the full operational history of the emissions unit. If 

less than one year has passed since the date of issuance of the permit to

operate then the historic actual emissions shall be zero. 

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Placer County APCD 502 - 7 Rules and Regulations
223 HISTORIC POTENTIAL EMISSIONS: Emissions based on the potential to emit of the

emissions unit prior to modification. In determining the potential to emit, daily emissions 

limitations shall be treated as part of an emissions unit's design only if the limitations are

representative of normal operations, or if the facility has provided offsets from previous

permitting actions. If there are no enforceable limiting conditions, an emissions unit's 

potential to emit shall be limited to the unit's historical actual emissions. For a new 

emissions unit historic potential emissions are equal to zero. For the purposes of the

above determination, "normal operations" is defined as the usual or typical daily 

operating of an emissions unit resulting in actual emissions which are at least 80% of the 

specific limits contained in the emission unit's authority to construct or permit to operate. 

224 LAKE TAHOE AIR BASIN: Established pursuant to Section 39606 of the Health &

Safety Code of the State of California and as described in Title 17, California Code of 

Regulations, Section 60113 (b), the basin includes that portion of Placer County within 

the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in 

the vicinity of the head of the Truckee River described as follows: commencing at the

point common to the aforementioned drainage area crestline and the line common to 

Townships 15 North and 16 North, Mount Diablo Base and Meridian (M.D.B. & M.), and

following that line in a westerly direction to the northwest corner of Section 3, Township

15 North, Range 16 East, (M.D.B. & M.), thence south along the west line of Sections 3 

and 10, Township 15 North, Range 16 East, M.D.B. & M., to the intersection with the

drainage crestline, thence following the said drainage area boundary in a southwesterly,

then northeasterly direction to and along the Lake Tahoe Dam, thence following the said

drainage area crestline in a northeasterly, then northwesterly direction to the point of

beginning. This Air Basin is delineated on an official map on file at the California Air 

Resources Board Headquarters Office.

225 MAJOR STATIONARY SOURCE: A stationary source which emits or has the potential

to emit: 25 tons per year (tpy) or more of nitrogen oxides, 25 tons per year or more of

reactive organic compounds, 100 tons per year or more of carbon monoxide, 100 tons

per year or more of PM10, 100 tons per year of sulfur oxides, 100 tons per year of any

regulated pollutant or levels specified by the U.S. Environmental Protection Agency 

pursuant to the Federal Clean Air Act of 1990, Section 112(a)(1). In addition, any

physical change occurring at a stationary source not otherwise qualifying as a major 

stationary source, which would constitute a major stationary source by itself makes the

source a major stationary source. For the purposes of Rule 507, FEDERAL 

OPERATING PERMIT PROGRAM, a major stationary source also includes any source

which emits or has a potential to emit 10 tpy of one HAP or 25 tpy of two or more

Hazardous Air Pollutants (HAPs), as listed pursuant to Section 112(b) of the Federal

Clean Air Act, or any lesser quantity threshold promulgated by the U.S. Environmental 

Protection Agency. 

226 MAJOR MODIFICATION: Modification to a major stationary source which results in an

increase in the potential to emit greater than: 25 tons per year of nitrogen oxides, 25 tons 

per year of reactive organic compounds, 100 tons per year of carbon monoxide, 40 tons

per year of sulfur oxides, or 15 tons per year of PM10 aggregated with all other increases 

in potential to emit over the period of five consecutive years before the application for 

modification, and including the calendar year of the most recent application. 

227 MODIFICATION: Any physical change, change in method of operation (including change 

in fuel characteristics), addition to, or any change in hours of operation, or change in

production rate of, which: 

227.1 For an emissions unit: 

a. would necessitate a change in permit conditions, or; 

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b. is not specifically limited by a permit condition, or; 

c. results in an increase, a decrease, or no change in emissions which are

not subject to an emissions limitation. 

227.2 For a stationary source: is a modification of its emissions unit, or addition of any

new emissions unit. 

227.3 The following shall not be considered a modification: 

a. A change in ownership. 

b. Routine maintenance and repair. 

c. A reconstructed stationary source or emissions unit that shall be treated

as a new stationary source or emissions unit, not as a modification. 

d. The addition of a continuous emission monitoring system. 

228 MOUNTAIN COUNTIES AIR BASIN: Established pursuant to Section 39606 of the

Health & Safety Code of the State of California and as described in Title 17, California 

Code of Regulations, Section 60111 (I), the Mountain Counties Air Basin includes all of

Placer County except that portion included in the Lake Tahoe Air Basin, defined by 17 

CCR 60113(b), and that portion included in the Sacramento Valley Air Basin, defined by

17 CCR 60106(k). 

229 NONATTAINMENT POLLUTANT: Any pollutant as well as any precursors of such

pollutants which have been designated "nonattainment" by the U.S. Environmental

Protection Agency in the Federal Register, or which has been designated nonattainment

by the California Air Resources Board pursuant to Section 39607 of the Health and

Safety Code. 

230 PM10: Particulate matter with an aerodynamic diameter smaller than or equal to a

nominal 10 microns as measured by an applicable reference test method or methods 

found in Article 2, Subchapter 6, Title 17, California Code of Regulations (commencing

with Section 94100). 

231 PORTABLE EQUIPMENT: Equipment that is periodically relocated and is not operated

more than a total of 180 days at any one location in the District within any continuous 

twelve (12) month period. 

232 POTENTIAL TO EMIT: The maximum daily physical and operational design capacity to 

emit an air pollutant during each calendar quarter. Any limitation on the physical or 

operational design capacity, including emission control devices and restrictions on hours

of operation, or on the type, or amount of material combusted, stored, or processed, may 

be considered as part of the design only if the limitation, or the effect it would have on

emissions, is incorporated into the Authority to Construct as an enforceable permit

condition as daily emissions limitations. Fugitive emissions associated with the

emissions unit or stationary source shall be included in the potential to emit of the 

emissions unit or stationary source. 

233 PRECURSOR: A pollutant that, when emitted into the atmosphere, may undergo either a

chemical or physical change which then produces another pollutant for which an ambient

air quality standard has been adopted, or whose presence in the atmosphere will

contribute to the violation of one or more ambient air quality standards. The following

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Placer County APCD 502 - 9 Rules and Regulations
precursor-secondary air contaminant relationships shall be used for the purposes of this 

rule: 

Precursor Secondary Air Contaminant 

Reactive Organic a. Photochemical oxidants (Ozone) 

Compound b. Organic fraction of PM10 

------------------------ --------------------------------------------------------- 

Nitrogen Oxides a. Nitrogen dioxide 

b. Nitrate fraction of PM10 

c. Photochemical oxidants (Ozone) 

------------------------ ---------------------------------------------------------- 

Sulfur Oxides a. Sulfur dioxide

b. Sulfates 

c. The sulfate fraction of PM10

------------------------ ---------------------------------------------------------- 

234 PRIORITY RESERVE BANK: A depository for preserving emission reduction credits 

pursuant to Rule 505, PRIORITY RESERVE. 

235 PROPOSED EMISSIONS: Emissions based on the potential to emit for the new or

modified emissions unit. 

236 QUARTERLY: Calendar quarters beginning in January, April, July, and October. 

237 QUARTERLY EMISSIONS LIMITATION: One or a combination of permit conditions

specific to an emissions unit that restricts its maximum emissions, in pounds per quarter, 

at or below the emissions associated with the maximum design capacity. A quarterly 

emissions limitation must be: 

237.1 Contained in the latest authority to construct and contained in or enforceable by 

the latest permit to operate for the emission unit, and 

237.2 Enforceable on a quarterly basis, and 

237.3 Established pursuant to a permitting action occurring after December 31, 1976. 

238 REACTIVE ORGANIC COMPOUND: Any compound containing carbon except: 

methane, carbon monoxide, carbon dioxide, carbonic acid, metallic carbides or 

carbonates, ammonium carbonates, and halogenated hydrocarbons. 

239 RECONSTRUCTED SOURCE: Any stationary source or emissions unit undergoing

physical modification where the fixed capital cost of the new components exceeds 50

percent of the fixed capital cost of a comparable entirely new stationary source or 

emissions unit. Fixed capital cost means that capital needed to provide all the

depreciable components. A reconstructed source shall be treated as a new stationary 

source or emissions unit. 

240 REDUCED SULFUR COMPOUNDS: The sulfur compounds hydrogen sulfide, carbon

disulfide and carbonyl sulfide. 

241 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 State or the U.S. 

Environmental Protection Agency has adopted an emission limit, standard, or other 

requirement. Regulated air pollutants include: 

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Rules and Regulations 502 - 10 Placer County APCD
241.1 Oxides of nitrogen and volatile organic compounds; 

241.2 Any pollutant for which a national ambient air quality standard has been 

promulgated pursuant to Section 109 of the Federal Clean Air Act; 

241.3 Any pollutant subject to a new source performance standard promulgated

pursuant to Section 111 of the Federal Clean Air Act; 

241.4 Any ozone-depleting substance specified as a Class I (chlorofluorocarbons) or 

Class II (hydrofluorocarbons) substance pursuant to Title VI of the Federal Clean

Air Act; and 

241.5 Any pollutant subject to a standard or requirement promulgated pursuant to 

Section 112 of the Federal Clean Air Act, including: 

a. Any pollutant listed pursuant to Section 112(r) of the Federal Clean Air 

Act (Prevention of Accidental Releases) shall be considered a "regulated

air pollutant" upon promulgation of the list. 

b. Any HAP subject to a standard or other requirement promulgated by the

U.S. Environmental Protection Agency pursuant to Section 112(d) or

adopted by the District pursuant to 112(g) and (j) of the Federal Clean Air 

Act 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 

Federal Clean Air Act. 

c. Any HAP subject to a District case-by-case emissions limitation 

determination for a new or modified source, prior to the U.S. 

Environmental Protection Agency 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 Federal Clean Air Act. 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. 

242 REPLACEMENT EQUIPMENT:

242.1 Functionally Identical Replacement: The replacement of or modification of 

emission units(s) where the replacement unit serves the identical function as the 

unit(s) being replaced, and the maximum rating and the potential to emit any 

pollutant will not be greater from the new or modified emissions unit(s) than the

replaced unit(s), when the emissions unit(s) are operated at the same permitted

conditions. 

242.2 Identical Replacement: The total or partial replacement of an emissions unit 

where the replacement is the same as the original unit in all respects except for 

serial number. 

243 SACRAMENTO VALLEY AIR BASIN: Established pursuant to Section 39606 of the

Health & Safety Code of the State of California and as described in Title 17, California 

Code of Regulations, Section 60106(k), the basin includes that portion of Placer County 

which lies west of Range 9 east, Mount Diablo Base and Meridian (M.D.B. & M.). 

December 9, 2004

Placer County APCD 502 - 11 Rules and Regulations
244 STATIONARY SOURCE (SOURCE OR FACILITY): Any building, structure, facility, or

emissions unit that emits or may emit any affected pollutant directly or as fugitive 

emissions. 

244.1 Building, structure, facility, or emissions unit includes all pollutant emitting

activities which: 

a. belong to the same industrial grouping, and; 

b. are located on one property or on two or more contiguous properties,

and; 

c. are under the same or common ownership, operation, or control or which

are owned or operated by entities which are under common control.

244.2 Pollutant emitting activities shall be considered as part of the same industrial 

grouping if: 

a. they belong to the same two-digit standard industrial classification code

under the system described in the 1987 Standard Industrial Classification

Manual, or; 

b. they are part of a common production process. (Common production

process includes industrial processes, manufacturing processes and any 

connected processes involving a common material.) 

244.3 The emissions within District boundaries of cargo carriers associated with the

stationary source shall be considered emissions from the stationary source to the 

extent that emission reductions from cargo carriers are proposed as offsets. 

245 TEMPORARY SOURCE: Temporary emission sources such as pilot plants, and portable

facilities which will be terminated or located outside the District after less than a 

cumulative total of 90 days of operation in any 12 continuous months, and the emissions 

resulting from the construction phase of a new source. 

246 TOTAL REDUCED SULFUR COMPOUNDS: The sulfur compounds hydrogen sulfide,

methyl mercaptan, dimethyl sulfide and dimethyl disulfide. 

300 STANDARDS

301 BEST AVAILABLE CONTROL TECHNOLOGY: An applicant shall apply Best Available 

Control Technology to a new emissions unit or modification of an existing emissions unit, 

except cargo carriers, for each emissions change of an affected pollutant, which would 

have an increase in emissions, according to procedures specified in Section 410, and the 

potential to emit of the new or modified emissions unit which equals or exceeds the levels

specified in Section 301.1. A condition which reflects BACT in a manner consistent with 

testing procedures, such as ppmv NOx, g/liter VOC, or lbs/hr shall be contained in the

latest authority to construct and permit to operate. 

301.1 Pollutant lb/day

Reactive organic compounds 10 

Nitrogen oxides 10 

Sulfur oxides 80 

PM10 80

Carbon monoxide 550 

(Continued on the next page) 

December 9, 2004

Rules and Regulations 502 - 12 Placer County APCD
Pollutant lb/day

Lead 3.3 

Vinyl chloride 5.5 

Sulfuric acid mist 38 

Hydrogen sulfide 55 

Total reduced sulfur compounds 55 

Reduced sulfur compounds 55 

302 OFFSET REQUIREMENTS, GENERAL:

302.1 An applicant shall provide offsets for the affected pollutant, except as provided in

Section 304, obtained pursuant to Rule 504, EMISSION REDUCTION CREDITS, 

or Rule 505, PRIORITY RESERVE, for new and modified sources where the 

cumulative emission changes of reactive organic compounds, nitrogen oxides, 

sulfur oxides, PM10 or carbon monoxide calculated pursuant to Section 411 or 

412 exceed the level specified in Section 302.1.a, below. Sufficient offsets shall 

be provided, from the same calendar quarter as the emissions, to offset positive

emissions changes of reactive organic compounds, nitrogen oxides and carbon

monoxide (except as provided in Section 302.2 and Sections 302.7 and 302.8, 

respectively) calculated according to procedures specified in Section 414. 

Sufficient offsets shall be provided, from the same calendar quarter as the 

emissions, to offset positive emissions changes of sulfur oxides and PM10

(except as provided in Section 302.9 and 302.10, respectively) calculated

according to procedures specified in Section 415. Facilities shall be required to 

curtail operations if sufficient offsets are not obtained as required by permit 

conditions. Except as provided for in Section 304, emission offsets used to

mitigate emission increases must be of the same pollutant type. The facility is 

ultimately responsible for ensuring offsets. 

a. Pollutant pounds per quarter tons per year

Reactive organic compounds 5,000 10 

Nitrogen oxides 5,000 10 

Sulfur oxides 12,500 25 

PM10 7,500 15 

Carbon monoxide 7,500 15 

302.2 Offsets for increases in carbon monoxide shall not be required if the applicant, 

using an air quality modeling analysis prepared pursuant to Section 402, 

demonstrates to the satisfaction of the Air Pollution Control Officer that the 

increase in ambient concentration does not exceed 500 micrograms per cubic 

meter, 8 hour average, at or beyond the property line of the stationary source. 

302.3 In no case shall halogenated hydrocarbons be used as offsets for reactive

organic compounds, nor shall exempt compounds or other compounds excluded

from the definition of reactive organic compounds be used as offsets for reactive

organic compounds. 

302.4 Portable equipment shall be evaluated for offsets at the initial location only. In

the event such portable equipment is shutdown, emission reduction credits shall 

be granted based on the emissions calculated at the initially permitted location. If 

operated a cumulative total of less than 90 days within a continuous 12 month

period, at all locations within the District and in any air basin of which the District 

is a part, the portable equipment is considered a temporary source. 

302.5 Except as allowed by Section 412.1 for sources which have provided full offsets 

of total suspended particulate (TSP), the PM10 emissions from an existing

December 9, 2004

Placer County APCD 502 - 13 Rules and Regulations
stationary source shall be recalculated from the TSP emission increases and

decreases which have occurred since December 31, 1976, using PM10 emission

factors. When PM10 emission factors do not exist assume 50% of the TSP is

PM10. 

302.6 Offsets can only come from regions with the same air quality designations or 

worse designations than that of the emissions unit or stationary source requiring

the offsets. 

302.7 Emission reductions of reactive organic compounds or nitrogen oxides during the 

quarters starting April 1 or July 1 may be used to offset positive emission

changes of the same pollutants during any calendar quarter. 

302.8 Emission reductions of carbon monoxide during the quarters starting January 1

or October 1 may be used to offset positive emission changes of carbon

monoxide during any calendar quarter. 

302.9 Emission reductions of PM10 during the quarters starting January 1 or October 1

may be used to offset positive emission changes of PM10 during any calendar 

quarter. 

302.10 Emission reductions of sulfur oxides during any quarter may be used to offset 

positive emission changes of sulfur oxides during any calendar quarter. 

303 LOCATION OF OFFSETS AND OFFSET RATIOS:

303.1 Except as provided in Subsections 303.2 and 303.3, and Section 304, an

applicant shall provide offsets for emissions from a proposed stationary source

subject to the requirements of Section 302 according to the following ratios and 

requirements as a minimum: 

 Offset Ratio 

 Non-Attainment Other Affected 

Location of Offset Pollutants Pollutants 

Same Source 1.0 to 1.0 1.0 to 1.0 

Within 15-Mile Radius 1.3 to 1.0 1.1 to 1.0 

and within the District 

Within 15-Mile Radius 1.3 to 1.0 1.2 to 1.0 

outside the District, but 

within the same air basin 

Greater than 15-Mile 2.0 to 1.0 1.2 to 1.0 

but within 50-Mile Radius 

and within District 

Greater than 15-Mile 2.1 to 1.0 1.3 to 1.0 

but within 50-Mile Radius and 

outside the District, but 

within the same air basin 

More than 50-Mile Greater than Greater than

Radius and within the 2.1 to 1.0 1.3 to 1.0 

same air basin 

December 9, 2004

Rules and Regulations 502 - 14 Placer County APCD
303.2 Offsets obtained from locations not satisfying the location criteria of Subsection

303.1, other than offsets obtained pursuant to Rule 505, PRIORITY RESERVE, 

shall be subject to an offset ratio of at least 1.2 to 1.0. An air quality analysis

pursuant to Section 306 shall be performed. The Air Pollution Control Officer 

may impose, based on the air quality analysis, a higher offset ratio such that the

new or modified stationary source will not prevent or interfere with the attainment

or maintenance of any ambient air quality standard. 

303.3 Applicants providing offsets obtained pursuant to Rule 505, PRIORITY 

RESERVE, shall be subject to an offset ratio of 1.0 to 1.0 for all pollutants at all 

distances except for major stationary sources. Major stationary sources 

providing offsets obtained pursuant to Rule 505, PRIORITY RESERVE, shall be

subject to an offset ratio of 1.2 to 1.0 for all pollutants at all distances. 

303.4 Offsets which are obtained from a stationary source pursuant to Sections 302

and 303 may offset emission increases in another district, and offsets obtained

from a stationary source in another district may offset emission increases of a

stationary source in Placer County, if both stationary sources are located in the 

same air basin. If the stationary sources are not in the same air basin, both of 

the following requirements must be met:

303.4.1 The stationary source to which the emission reductions are credited must

be located in an upwind district that is classified, pursuant to Health and

Safety Code Section 40910 et seq., as being in a worse nonattainment

status than the downwind district where the stationary source having the

emission increases is located. 

303.4.2 The stationary source at which there are emission sources to be offset is 

located in a downwind district that is overwhelmingly impacted, as 

determined pursuant to Health and Safety Code Section 39610, by

emissions transported from the upwind district where the stationary 

source to which the emission reductions are credited is located. 

Any offset credited to a stationary source in one district using offsets obtained

from reductions from a stationary source in another district shall be approved by 

a resolution adopted by the governing board of the upwind district and the

governing board of the downwind district, after taking into consideration the

impact of the offset on air quality, public health, and the regional economy. The

District’s governing board may delegate to the Air Pollution Control Officer the 

Board’s authority to approve the offsets credited. 

303.5 If Placer County is where the stationary source to which emission reductions are

credited is located, the District shall determine the type and quantity of the

emission reductions to be credited. 

303.6 If Placer County is where the stationary source at which there are emission 

increases to be offset is located, the District shall do both of the following: 

303.6.1 Determine the impact of those emissions reductions in mitigation of the

emission increases in the same manner and to the same extent as the 

district would do so for fully credited emission reductions from sources 

located within Placer County, and 

303.6.2 Discount the emission reductions credited to the source in the other 

district. The extent of the discount shall be determined pursuant to the 

following as though the source was a comparable source located within

December 9, 2004

Placer County APCD 502 - 15 Rules and Regulations
Placer County and the discount shall not be less than that which is

required for comparable sources located within Placer County: Rule 

502, New Source Review, Section 305.2; Rule 504, Emission Reduction

Credits, Sections 302, 408.4, and 409; and Rule 506, Biomass Emission 

Reduction Credits and Banking, Sections 401.6, and 404. 

303.7 Pursuant to Health and Safety Code Section 40918.7, emission reduction offset 

credits created in one district pursuant to Health and Safety Code, Section

41865, subdivision (p), pertaining to offsets created by rice straw burning 

emission reductions, shall be approved for use by a stationary source located in

another district if all of the following conditions are met: 

303.7.1 The district containing the source providing the offset credits does not 

have a no net-increase permitting program in its attainment plan. 

303.7.2 The district where the offset credits are to be used is designated as

having a “moderate” state ambient air quality designation for ozone, 

carbon monoxide, sulfur dioxide, and nitrogen dioxide.

303.7.3 The district where the offset credits are to be used is located in the same 

air basin as, or within an air basin that is contiguous to, the air basin in

which the district containing the source providing the offsets is located. 

303.7.4 The site where the offset credits will be used is located within 200 linear 

air miles from the source providing the offset credits. 

(District Rule 506, BIOMASS EMISSION REDUCTION CREDITS AND 

BANKING, Section 300, lists additional applicable requirements for transfer and

use of these credits.) 

304 INTERPOLLUTANT OFFSETS: The Air Pollution Control Officer may approve 

interpollutant offsets for precursor pollutants on a case by case basis, provided that the

applicant demonstrates through the use of an air quality model that the emission

increases from the new or modified source will not cause or contribute to a violation of an 

ambient air quality standard. In such cases, the Air Pollution Control Officer shall

impose, based on an air quality analysis, offset ratios greater than the requirements of

Section 303. Interpollutant offsets between PM10 and PM10 precursors may be allowed

only if PM10 precursors contribute significantly to the PM10 levels that exceed the PM10 

ambient standards. PM10 emissions shall not be allowed to offset nitrogen oxides or

reactive organic compound emissions in ozone nonattainment areas, nor be allowed to

offset sulfur oxide emissions in sulfate nonattainment areas. 

305 EMISSION REDUCTIONS, SHUTDOWNS AND CURTAILMENTS: Actual emission 

reductions from a shutdown or curtailment of permitted emission units may be credited

for the purposes of banking and offsets pursuant to Rule 504, EMISSION REDUCTION 

CREDITS, provided: 

305.1 Application is made for emission reduction credits. 

305.2 The crediting and disbursement of emission reductions from source shutdowns 

and curtailments shall be in accordance with the most current U.S. 

Environmental Protection Agency emissions trading policy and applicable federal 

regulations. 

December 9, 2004

Rules and Regulations 502 - 16 Placer County APCD
305.3 Emissions decreases are ensured and documented by enforceable emission

limitations contained in the permit to operate, or emissions decreases are

ensured by the permanent surrender or cancellation of the permit to operate. 

306 AMBIENT AIR QUALITY STANDARDS: In no case shall emissions from the new or

modified stationary source, prevent or interfere with the attainment or maintenance of any

applicable ambient air quality standard, except as provided in Section 302.2. The Air 

Pollution Control Officer may require the use of an air quality model to estimate the

effects of a new or modified stationary source. The analysis shall estimate the effects of 

a new or modified stationary source, and verify that the new or modified stationary source

will not prevent or interfere with the attainment or maintenance of any ambient air quality 

standard. In making this determination the Air Pollution Control Officer shall take into 

account the mitigation of emissions through offsets pursuant to this rule and the impacts 

of transported pollutants on downwind pollutant concentrations. The Air Pollution Control

Officer may impose, based on an air quality analysis, offset ratios greater than the

requirements of Section 303. 

307 DENIAL, FAILURE TO MEET STANDARDS: The Air Pollution Control Officer shall 

deny any authority to construct or permit to operate if the Air Pollution Control Officer 

finds that the subject of the application would not comply with the standards set forth in

District, state, or federal rules or regulations. Stationary sources and emission units are 

required to curtail operations corresponding to the extent that required offsets are not

obtained, or are not permanently maintainable. The owner or operator of the stationary 

source or emissions unit requiring offsets has the ultimate responsibility for ensuring 

offsets are real, surplus, permanent, and quantifiable.

308 CEQA APPLICABILITY: All proposed new and modified sources for which an authority

to construct must be obtained from the District shall be reviewed in accordance with the

requirements of CEQA, including, but not limited to, alternative siting and benefits 

analysis. 

309 DENIAL, FAILURE TO MEET CEQA: The Air Pollution Control Officer shall deny any 

authority to construct or permit to operate if the Air Pollution Control Officer finds that the

subject of the application would not comply with the standards set forth in CEQA. 

400 ADMINISTRATIVE REQUIREMENTS

The following administrative requirements in Sections 401-415 shall apply to any activities 

regulated by this rule, except for the review of power plants over 50 megawatts. Power plants

over 50 megawatts shall be subject to the review requirements of Section 416, and applicable 

requirements of Rule 507, FEDERAL OPERATING PERMIT PROGRAM. Stationary sources that

are subject to Rule 507, FEDERAL OPERATING PERMIT PROGRAM, shall be permitted in

accordance with the procedures specified in that rule, in addition to the requirements of this

Section that are consistent with Rule 507. 

401 COMPLETE APPLICATION: With the exception of applications for initial permit to

operate, permit renewal, or a significant modification for stationary sources subject to the

requirements of Title V of the Federal Clean Air as amended in 1990 and Rule 507,

FEDERAL OPERATING PERMIT PROGRAM, the Air Pollution Control Officer shall

determine whether the application is complete no later than 30 days after receipt of the

application, or after such longer time period that the applicant and the Air Pollution 

Control Officer have agreed to in writing. If the Air Pollution Control Officer determines 

that the application is not complete, the applicant shall be notified in writing of the

decision specifying the information required. Upon receipt of any re-submittal of the 

application, a new 30-day period to determine completeness shall begin. Completeness 

of an application or a re-submitted application shall be evaluated on the basis of the

December 9, 2004

Placer County APCD 502 - 17 Rules and Regulations
information requirements set forth in District regulations (adopted pursuant to Article 3, 

65940 through 65944 of Chapter 4.5 of Division l of Title 7 of the California Government 

Code) as they exist on the date on which the application or re-submitted application was 

received, on the CEQA-related information which satisfies the requirements of the 

District's CEQA Guidelines, and the applicable requirements of Rule 507, FEDERAL

OPERATING PERMIT PROGRAM. The Air Pollution Control Officer may, during the

processing of the application, request an applicant to clarify, amplify, correct, or otherwise 

supplement the information submitted in the application. 

402 AIR QUALITY MODELS: All air quality models used for the purposes of this rule shall be

consistent with the requirements provided in the most recent edition of U.S. 

Environmental Protection Agency "Guidelines on Air Quality Models, OAQPS 1.2-080"

unless the Air Pollution Control Officer finds that such model is inappropriate for use. 

After making such a finding the Air Pollution Control Officer may designate an alternate

model only after allowing for public comment, and only with concurrence of the U.S.

Environmental Protection Agency. Credit shall not be given for stacks higher than that

dictated by good engineering practice. All modeling costs associated with the siting of a

stationary source shall be borne by the applicant. 

403 PRELIMINARY DECISION: Except as provided in Section 111, following acceptance of

an application as complete, the Air Pollution Control Officer shall perform the evaluations

required to determine compliance with all applicable district rules and regulations and

make a preliminary written decision as to whether a permit to construct should be

approved, conditionally approved, or denied. When the District is the CEQA Lead

Agency for a project, the Air Pollution Control Officer shall not issue a preliminary

decision until the draft Environmental Impact Report or Negative Declaration is available

for public review. The decision shall be supported by a succinct written analysis. 

403.1 The Air Pollution Control Officer shall transmit to the California Air Resources 

Board and the U.S. Environmental Protection Agency its preliminary written

decision and analysis for sources subject to Sections 301, 302, 303, and 306 no

later than the date of publication as required in Section 404. For initial permits to 

operate, renewal of permits, significant and minor permit modifications, and

reopenings for cause of sources subject to the requirements of Title V of the 

Federal Clean Air Act as amended in 1990 (42 U.S.C. Section 7401 et seq.), and 

pursuant to Rule 507, FEDERAL OPERATING PERMIT PROGRAM, the 

proposed decision, analysis, public notice, and draft permit if applicable, shall be

sent to the U.S. Environmental Protection Agency for a 45 day review period. 

404 PUBLICATION AND PUBLIC COMMENT: Except as provided in Section 111, within ten

calendar days following a preliminary decision pursuant to Section 300, Standards, of this 

rule, the Air Pollution Control Officer shall publish in at least one newspaper of general 

circulation in the District a notice stating the preliminary decision of the Air Pollution

Control Officer, noting how the pertinent information can be obtained, and inviting written

public comment for a 30-day period following the date of publication. For initial permits to

operate, renewal of permits, significant permit modifications, and reopenings for cause of 

sources subject to Rule 507, FEDERAL OPERATING PERMIT PROGRAM, public notice 

shall be given pursuant to the requirements of that rule. 

405 PUBLIC INSPECTION: Except as provided in Section 111, the Air Pollution Control 

Officer shall make available for public inspection at the District's office the information 

submitted by the applicant and the Air Pollution Control Officer's analysis no later than

the date the notice of the preliminary decision is published, pursuant to Section 404. 

Information submitted which contains trade secrets shall be handled in accordance with 

Section 6254.7 of the California Government Code and relevant sections of the California

Administrative Code. Further, all such information shall be transmitted no later than the 

December 9, 2004

Rules and Regulations 502 - 18 Placer County APCD
date of publication to the California Air Resources Board and the U.S. Environmental

Protection Agency regional office, and to any party which requests such information. For 

initial permits to operate, renewal of permits, significant permit modifications, and 

reopenings for cause of sources subject to Rule 507, FEDERAL OPERATING PERMIT 

PROGRAM, written notice, the proposed permit, and upon request, the District's analysis,

shall be provided to interested parties or agencies pursuant to the requirements of that 

rule. 

406 AUTHORITY TO CONSTRUCT, FINAL ACTION:

406.1 Within 180 days after acceptance of an application as complete, the Air Pollution

Control Officer shall take final action on the application after considering all 

written comments. 

406.2 Notwithstanding this 180-day limit, the Air Pollution Control Officer shall not take 

final action for any project for which an Environmental Impact Report (EIR) or a 

Negative Declaration is being prepared until a final EIR for that project has been

certified or a Negative Declaration for that project has been approved, and the Air 

Pollution Control Officer has considered the information in that final EIR or 

Negative Declaration. The Air Pollution Control Officer shall take final action on

the application within whichever of the following periods of time is longer: 

a. Within 180 days after the certification of the final EIR or approval of the 

Negative Declaration, or

b. Within 180 days of the date on which the application was determined

complete by the Air Pollution Control Officer. 

406.3 Except as provided in Section 111, the Air Pollution Control Officer shall provide 

written notice of the final action to the applicant, the U.S. Environmental 

Protection Agency, and the California Air Resources Board, and shall publish

such notice in a newspaper of general circulation and shall make the notice and

all supporting documents available for public inspection at the District's office. 

407 REQUIREMENTS, AUTHORITY TO CONSTRUCT AND PERMIT TO OPERATE:

407.1 General Conditions: As a condition for the issuance of an authority to construct 

and a permit to operate, the Air Pollution Control Officer shall require that the 

emissions unit and stationary source, and any emissions units which provide 

offsets, be operated in the manner stated in the application in making the

analysis required to determine compliance with this rule, and as conditioned in 

the authority to construct. 

407.2 Emissions Limitations: All of the following emissions limitations shall be included

in the authority to construct and permit to operate, if applicable. 

a. The authority to construct and permit to operate shall include emission

limitations that reflect Best Available Control Technology. Such 

condition(s) shall be expressed in a manner consistent with testing

procedures, such as ppmv NOx, g/liter VOC, or lbs/hr.

b. A quarterly emissions limitation for each affected pollutant for which

offsets are being provided pursuant to Section 302.1 shall be contained 

in the authority to construct and permit to operate. 

December 9, 2004

Placer County APCD 502 - 19 Rules and Regulations
c. A daily emission limitation shall be contained in the authority to construct

and permit to operate for all affected pollutants for which offsets are not 

being provided pursuant to Section 302.1, or when required to be 

consistent with ambient air quality standards. 

d. Electrical power plants shall also contain a quarterly emissions limitation 

for operation of increased power plant operation needed to compensate

for reduced operation at other power plant(s) within the District due to

emergency breakdown, pursuant to Rule 404, UPSET CONDITIONS, 

BREAKDOWN, OR SCHEDULED MAINTENANCE, and regularly 

scheduled maintenance. 

e. Permits to operate for sources subject to the requirements of Rule 507, 

FEDERAL OPERATING PERMIT PROGRAM, shall contain all 

applicable federal requirements in addition to the applicable limitations of

(a), (b), (c), and (d), above.

407.3 Design, Operational, or Equipment Standards: If the Air Pollution Control Officer 

determines that technological or economic limitations on the application of

measurement methodology to a particular class of sources would make the

imposition of a numerical emission standard infeasible, the Air Pollution Control

Officer may instead prescribe a design, operational, or equipment standard. In

such cases, the District shall make its best estimate as to the emission rate that

will be achieved and shall specify that rate in required submissions to the U.S. 

Environmental Protection Agency. Any permits issued without an enforceable

numerical emission standard must contain enforceable conditions which assure

that the design characteristics or equipment will be properly maintained, or that 

the operational conditions will be properly performed, so as to continuously

achieve the assumed degree of control. 

407.4 Offsets: 

a. Except as provided in Section 407.4.b, below, the operation of any 

emissions unit or stationary source which provides offsets shall be 

subject to enforceable permit conditions, containing specific emissions

and operational limitations, to ensure that the emission reductions shall

be provided in accordance with the provisions of this rule and shall 

continue for the reasonably expected life of the proposed emissions unit

or stationary source. 

b. Where the source of offsets is not required to obtain an authority to 

construct or a permit to operate pursuant to Rule 501, GENERAL

PERMIT REQUIREMENTS, and Rule 504, EMISSION REDUCTION 

CREDITS, a written contract or a functional equivalent as determined by

the Air Pollution Control Officer shall be required between the applicant 

and the owner or operator of such source, which contract, by its terms, 

shall be enforceable by the Air Pollution Control Officer. For sources 

subject to federal NSR requirements, in the absence of federally 

enforceable conditions, the execution of a source specific SIP revision is

required. 

c. An internal emission offset will be considered enforceable if it is made a 

State Implementation Plan (SIP) requirement by inclusion as a condition 

of the new source permit and the permit is forwarded to the U.S.

Environmental Protection Agency. 

December 9, 2004

Rules and Regulations 502 - 20 Placer County APCD
d. Except as provided in Section 407.4.b, external offsets must be made

enforceable either by revision of an offsetting source's authority to

construct and permit to operate or by submittal of a SIP revision to U.S. 

Environmental Protection Agency prior to the operation of the emissions 

unit. The revised permit shall be forwarded to the U.S. Environmental

Protection Agency. The SIP revision submittal shall be submitted to the 

California Air Resources Board to be forwarded to the U.S.

Environmental Protection Agency as part of the State Implementation

Plan. 

e. A violation of the emission limitation provisions of any contract pursuant

to Section 407.4.b, above, shall be a violation of this rule by the 

applicant. 

f. The operation of any emissions unit or stationary source which uses

offsets provided by another emissions unit or stationary source shall be

subject to enforceable permit conditions, containing specific emissions

and operational limits, to ensure that the emission reductions are used in

accordance with the provisions of District rules and shall continue for the

reasonably expected life of the proposed emissions unit or stationary

source.

g. For sources subject to federal requirements, the permanence of

emissions reductions may be demonstrated by federally enforceable 

changes in source permits or applicable District regulations to reflect a 

reduced level of allowable emissions. 

408 ISSUANCE, PERMIT TO OPERATE: The Air Pollution Control Officer shall issue a 

permit to operate an emissions unit subject to the requirements of this rule if it is

determined that any offsets required as a condition of an authority to construct or

amendment to a permit to operate will commence not later than the initial operation of the

new or modified source, and that the offsets shall be maintained throughout the operation 

of the new or modified source which is the beneficiary of the offsets. Further, the Air 

Pollution Control Officer shall determine that all conditions specified in the authority to

construct have been complied with or will be complied with by the dates specified on the

authority to construct. Such applicable conditions shall be contained in the permit to 

operate. Where a new or modified stationary source is, in whole or in part, a replacement

for an existing stationary source on the same property, the Air Pollution Control Officer 

may allow a maximum of 90 days as a startup period for simultaneous operation of the 

existing stationary source and the new source or replacement. For initial permits to 

operate, renewal of permits, significant permit modifications, and reopenings for cause of 

sources subject to Rule 507, FEDERAL OPERATING PERMIT PROGRAM, permit

issuance shall comply with the requirements and procedures of that rule. 

409 REGULATIONS IN FORCE GOVERN: An authority to construct shall be granted or

denied based on Best Available Control Technology and offset requirements of Sections

301 and 302 in force on the date the application is deemed complete as defined in

Section 211. In addition, the Air Pollution Control Officer shall deny an authority to 

construct for any new stationary source or modification, or any portion thereof, unless: 

409.1 Compliance with District Rules: The new source or modification, or applicable

portion thereof, complies with the provisions of this rule and all other applicable

district rules and regulations; and 

409.2 Certification of Compliance: The owner or operator of the proposed new or

modified source has certified that all existing major stationary sources owned or 

December 9, 2004

Placer County APCD 502 - 21 Rules and Regulations
operated by such person (or by any entity controlling, controlled by, or under 

common control with such person) in California which are subject to emission

limitations are in compliance, or on an expeditious schedule for compliance, with

all applicable emission limitations and standards. 

410 CALCULATION OF EMISSIONS BACT: The emissions change for a new or modified

emissions unit shall be calculated by subtracting historic actual emissions from proposed 

emissions. Calculations shall be performed separately for each emissions unit for each 

calendar quarter. 

411 CALCULATION OF EMISSIONS - OFFSETS TRIGGER FOR ROC, NOX AND CO: The

potential to emit for each calendar quarter for a stationary source shall be the sum of the

potential to emit, including fugitive emissions, for all emissions units based on current 

permits to operate and authorities to construct where permits to operate have not been

issued, the pending application and banked emission reduction credits obtained after 

September 21, 1993, from emissions units installed before September 21, 1993, and 

after December 31, 1976. 

412 CALCULATION OF EMISSIONS - OFFSET TRIGGER FOR SOX AND PM10: Except 

as provided in Sections 412.1 and 412.2, the cumulative emissions increases for each

calendar quarter for a stationary source shall be the sum of emissions from Sections

412.3, 412.4, and 412.5 for each calendar quarter, expressed in terms of pounds per day. 

412.1 An application for a modification, deemed complete after September 21, 1993, to

an emissions unit or stationary source, constructed or whose application is

deemed complete prior to September 21, 1993, and which had provided full

offsets for total suspended particulate matter emissions occurring after 

December 31, 1976 but before September 21, 1993, those total suspended 

particulate matter emissions shall not be recalculated as PM10. However, all 

subsequent increases in PM10 emissions must be offset. 

412.2 Except as provided in Section 412.5, any emissions increase represented by an 

authority to construct or permit to operate which has been canceled or has 

expired and any emission reduction credits surrendered to the District shall not 

be included in the cumulative emissions increase calculation pursuant to Section

413. 

412.3 The potential to emit for all emissions units installed after December 31, 1976 

based on current permits to operate or authorities to construct where permits to

operate have not been issued, including the pending application being reviewed.

412.4 All emission increases from the modification to emissions units installed prior to 

December 31, 1976 and modified after December 31, 1976 as determined by

procedures specified in Section 411 or procedures specified in Rule 502 at the 

time of modification. 

412.5 Emission reduction credits obtained pursuant to Rule 504, EMISSION

REDUCTION CREDITS, after December 31, 1976, from emissions units installed

after December 31, 1976. 

413 CALCULATION OF EMISSIONS - OFFSETS GENERAL: The emissions change for a 

new or modified emissions unit shall be calculated by subtracting historic potential

emissions from proposed emissions. Calculations shall be performed separately for each

pollutant and each emissions unit for each calendar quarter. Negative emissions 

changes shall be processed under the procedures specified in Rule 504, EMISSION 

REDUCTION CREDITS, and Rule 507, FEDERAL OPERATING PERMIT PROGRAM,

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Rules and Regulations 502 - 22 Placer County APCD
for early Hazardous Air Pollutant reductions satisfying the requirements of Section 

112(I)(5) of the Federal Clean Air Act as amended in 1990. 

414 CALCULATION OF EMISSIONS - OFFSETS REQUIRED FOR ROC, NOX AND CO: 

The cumulative net emissions increase pursuant to Section 413 for a stationary source

shall be the sum of emissions from each of the following for each calendar quarter

expressed in terms of pounds per quarter. 

414.1 The potential to emit including associated fugitive emissions, not previously

offset, for all emissions units installed after September 21, 1993, based on

current permits to operate and authorities to construct, where permits to operate

have not been issued, and the pending application. 

414.2 All emission increases, including associated fugitive emissions, not previously 

offset, from the modification to emissions units installed before September 21, 

1993, but modified after September 21, 1993, as determined by procedures 

specified in 413 or pursuant to calculation procedures specified in Rule 502, 

NEW SOURCE REVIEW, at the time of the modification. 

Any emissions increase represented by an authority to construct or permit to operate

which has been canceled or has expired shall not be included in the cumulative

emissions increase calculation. 

415 CALCULATION OF EMISSIONS - OFFSETS REQUIRED FOR SOX AND PM10: The 

cumulative net emissions increase pursuant to Section 413 for a stationary source shall

be the sum of emissions from each of the following for each calendar quarter expressed

in terms of pounds per quarter. 

415.1 The potential to emit including associated fugitive emissions, not previously

offset, for all emissions units installed after September 21, 1993, based on

current permits to operate or authorities to construct where permits to operate

have not been issued, including the pending application being reviewed. 

415.2 All emission increases including associated fugitive emissions, not previously

offset, from the modification to emissions units installed before September 21, 

1993, but modified after September 21, 1993, as determined by procedures 

specified in Section 413 or pursuant to calculation procedures specified in Rule

502, NEW SOURCE REVIEW, at the time of the modification. 

Any emissions increase represented by an authority to construct or permit to operate

which has been canceled or has expired shall not be included in the cumulative

emissions increase calculation. 

416 POWER PLANTS: This section shall apply to all power plants proposed to be

constructed in the District and for which a Notice of Intention (NOI) or Application for 

Certification (AFC) has been accepted by the California Energy Commission. 

416.1 Within 14 days of receipt of a Notice of Intention, the Air Pollution Control Officer 

shall notify the Air Resources Board and the California Energy Commission of 

the District's intent to participate in the Notice of Intention proceeding. If the

District chooses to participate in the Notice of Intention proceeding, the Air 

Pollution Control Officer shall prepare and submit a report to the California Air 

Resources Board and the California Energy Commission prior to the conclusion 

of the non-adjudicatory hearing specified in Section 25509.5 of the California 

Public Resources Code. That report shall include, at a minimum: 

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Placer County APCD 502 - 23 Rules and Regulations
a. a preliminary specific definition of Best Available Control Technology for 

the proposed facility; 

b. a preliminary discussion of whether there is substantial likelihood that the 

requirements of this rule and all other District regulations can be satisfied 

by the proposed facility; 

c. a preliminary list of conditions which the proposed facility must meet in 

order to comply with this rule or any other applicable district regulation. 

The preliminary determinations contained in the report shall be as specific as 

possible within the constraints of the information contained in the Notice of 

Intention. 

416.2 Upon receipt of an Application for Certification for a power plant, the Air Pollution

Control Officer shall conduct a determination of compliance review. This 

determination shall consist of a review identical to that which would be performed

if an application for a permit to construct had been received for the power plant. 

If the information contained in the Application for Certification does not meet the 

requirements of this rule, the Air Pollution Control Officer shall, within 20 calendar 

days of receipt of the Application for Certification, so inform the California Energy

Commission, and the Application for Certification shall be considered incomplete 

and returned to the applicant for re-submittal. 

416.3 The Air Pollution Control Officer shall consider the Application for Certification to

be equivalent to an application for a permit to construct during the determination 

of compliance review, and shall apply all provisions of this rule which apply to

applications for a permit to construct. 

416.4 The Air Pollution Control Officer may request from the applicant any information 

necessary for the completion of the determination of compliance review. If the

Air Pollution Control Officer is unable to obtain the information, the Air Pollution 

Control Officer may petition the presiding Commissioner of the California Energy

Commission for an order directing the applicant to supply such information. 

416.5 Within 180 days of accepting an Application for Certification as complete, the Air 

Pollution Control Officer shall make a preliminary decision on: 

a. whether the proposed power plant meets the requirements of this rule

and all other applicable district regulations, and; 

b. in the event of compliance, what permit conditions will be required 

including the specific Best Available Control Technology requirements 

and a description of required mitigation measures. 

The preliminary written decision under Section 414.5 shall be treated as a

preliminary decision under Section 403 of this rule, and shall be finalized by the

Air Pollution Control Officer only after being subject to the public notice and 

comment requirements of Sections 403 and 404. The Air Pollution Control 

Officer shall not issue a determination of compliance for the power plant unless 

all requirements of this rule are met. 

416.6 Within 240 days of the filing date, the Air Pollution Control Officer shall issue and 

submit to the California Energy Commission a determination of compliance or, if 

such a determination cannot be issued, shall so inform the California Energy 

Commission. A determination of compliance shall confer the same rights and

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Rules and Regulations 502 - 24 Placer County APCD
privileges as an authority to construct only when and if the California Energy 

Commission approves the Application for Certification, and the California Energy 

Commission certificate includes all conditions of the determination of compliance. 

416.7 Any applicant receiving a certificate from the California Energy Commission

pursuant to this section and in compliance with all conditions of the certificate 

shall be issued a permit to operate by the Air Pollution Control Officer. If subject

to the requirements of Title V of the Federal Clean Air Act as amended in 1990

(42 U.S.C. Section 7401 et seq.), the applicant must comply with the applicable 

requirements of Rule 507, FEDERAL OPERATING PERMIT PROGRAM. 

500 MONITORING AND RECORDS

501 RECORDKEEPING: The following records shall be maintained for two years and shall

be provided to the Air Pollution Control Officer upon request. 

501.1 Emergency Electrical Generating Equipment: Records of operation for 

maintenance purposes, for actual interruptions of power. 

501.2 Portable and Temporary Equipment: Records of operating location and

corresponding dates of operation. 

502 RECORDKEEPING FOR SOURCES SUBJECT TO RULE 507: The recordkeeping 

requirements for sources subject to Rule 507, FEDERAL OPERATING PERMIT

PROGRAM, shall include all of the requirements of that rule in addition to the separate

recordkeeping requirements of applicable federal requirements. 

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