PART A 

PARTB 

I)ARTC 

PART 0 

PARTE 

PART F 

PAin'() 

36 CR I and 2, 01-1:3 

TABLE OF CONTENTS 

CONCEHNlNG GENERAL PROVISIONS APPLICABLE TO REPORTING 

ANL) PERr..llTTING .......................................................................................................... ! 

APPENDIX A. Method for Uetennining 0~ Minimis Lt:vcls for Non-Criteria 

Reportable Pollutants ................................................................................................. 51 

APPEND! X H. Non-criteria Reportable PoUmant.s (Sorted alph:.tb~:tkally by 

BIN) ........................................................................................................................... 52 

APPI'.'NOIX B. Non-criteria Reportable Pollutants (Sorted by CAS Number) ........................ 59 

CONCERNING CONSTRUCTION PERMIT$ ...................................................................... 66 

CONCERNING OPERATING PF.RMITS .............................................................................. 79 

CONCERNING MMOR STATIONARY SOURCE NEW SOURCE REVIEW 

AND PIU~V£NTION OF SKi IFICANT DF.TI::RIORATIO ..................................... 115 

RESERVED FOR ENVIRONMENTAL MANAGEMENT SYSTEMS .............................. I73 

REGI;ONAL llAZI.:: LIMITS - !:JEST AVAILABLE RETROfiT 

TECIINOLOGY (BART} AND REASONABLE PROGRESS (RP) ............................ 173 

STATEMENTS OF liASIS. SPECIFIC STATUTORY AUlHORJTY ,\N() 

PURPOS£ .................................................................................................................... 188.6 

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PART D CONCERNING MAJOR STATIONARY SOURCE NEW SOURCE REVIEW AND 

PREVENTION OF SIGNIFICANT DETERIORATION 

Applicability 

General Applicability 

This Part D shall apply to any new or existing major stationary source. 

Any ew major stationary source or major modification, to which the requirements f this Part 

0 app , shall not begin actual construction in a nonattainment, attainment, or u lassif1able 

area un ss a permit has been issued containing all applicable state and fede 

requireme Is. 

I.A.2. Exce as otherwise provided in Section XV. of this Part D, and nsistent with the 

definitio of major modification (Section II.A.22. of this part), a roject is a major 

modificatt n for a regulated NSR pollutant if it causes two ty es of emissions 

increases- significant emissions increase (as defined in ection II.A.43. of this 

part), and as nificant net emissions increase (as defin in Sections II.A.26. and 

II.A.42. of this rt). The project is not a major modific 1on if it does not cause a 

significant emissi s increase. If the project causes significant emissions increase, 

then the project is ajor modification only if it ai results in a significant net 

i.A.3. The procedure for calcul 'ng (before begin · g actual construction) whether a 

significant emissions incre e (i.e .. the firs step of the process) will occur depends 

upon the type of emissions u 'Is being c structed or modified, according to Sections 

1.8.1. through 1.8.3. of this part. Jhe pr cedure for calculating (before beginning 

actual construction) whether a si ifi ant net emissions increase will occur at the 

major stationary source (i.e., the s ond step of the process) is contained in the 

definition of Net Emissions lncre e ection II.A.26. of this part). Regardless of any 

such preconstruction projectio , a ma r modification results if the project causes a 

significant emissions increas and a sign 1cant net emissions increase. 

1.8. Applicability Tests 

1.8.1. Actual-to-projected- tual applicability test for pr ·eels that only involve existing 

emissions units. 

A significant emissions · crease of a regulated NSR pollutant i rojected to occur if the sum 

of the difference be en the projected actual emissions (as defi ed in Section II.A.36. of this 

part) and the baser e actual emissions (as defined in Sections II.A .a. and II.A.4.b. of this 

part. as applicabl , for each existing emissions unit, equals or exce s the significant 

amount for that ollutant (as defined in Section II.A.42. of this part). 

1.8.2. Ac al-to-potential test for projects that only involve construction o new emissions 

u 1t(s). 

A sig ficant emissions increase of a regulated NSR pollutant is projected to occ 

oft e difference between the potential to emit (as defined in Section 1.8.37. of Pa of this 

r ulalion) from each new emissions unit following completion of the project and the aseline 

ctual emissions (as defined in Section II.A.4. of this part) of these units before the pro· ct 

equals or exceeds the significant amount for that pollutant (as defined in Section II.A.42. f 

this part). 

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1.8.3. Hybrid test for projects that involve multiple types of emissions units. 

A significant emissions increase of a regulated NSR pollutant is projected to occur if the su 

of the emissions increases for each emissions unit, using the methods specified in Secti s 

.8.1. through 1.8.3. of this part as applicable with respect to each type of emissions un· , 

e uals or exceeds the significant amount for that pollutant (as defined in Section II. A. 2. of 

thi an). 

An owner or operator of a major stationary source who conducts the ac al-toejected-actual test for a project that requires a minor permit modific ion in 

ao ordance with Section X. of Part C. requires a significant permit dification in 

ace dance with Section I.A.3. of Part C, a modification as define 1n Section 1.8.28. 

of Pa A or that requires a minor source permit under Part 8 sh I submit a permit 

applica n including: 

I.B.4.a. All lculations and supporting documentation us to determine baseline 

actua emissions of each emissions unit affecte y the project; 

I.B.4.b. All calcul lions and supporting documentati used to determine projected 

actual emi ions of each existing emission unit affected by the project; 

I.B.4.c. A delermlnatlo of that portion of each xisting unit's emissions following the 

project that the it could have acco modated during the consecutive 

twenty-four month eriod used toe ablish the baseline actual emissions and 

that are unrelated to he project. i eluding any increased utilization due to 

product demand grow ; and, 

ted by the Division that may be needed to 

lion will occur al each emissions unit affected by 

The information submitted i 

The requirementtha e owner or operator of a ajor stationary source who 

conducts the actua o-projected-actualtest for a p ject that requires a minor permit 

modification sub t information in accordance with ctions I.B.4.a. through I.B.4.d .. 

as set out in thi Subsection 1.8.4., shall not be federa enforceable and shall not be 

incorporated i to the state implementation plan. 

I. C. For any major sta · nary source requesting, or operating under. a P nt-wide Applicability 

Limitation (as d ned in Section II.A.33.) for a regulated NSR pollutan 

source shall c ply with the requirements of Section XV. of this part. 

II. 

I I.A. wing definitions apply specifically to the provisions contained in this Pa 

Actual Emissions 

The actual rate of emission of a regulated NSR pollutant from an emissions un· , 

determined as follows: 

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II.A.1 .a. Actual emissions as of a particular date shall equal the average rate, in ton 

per year, at which the unit actually emitted the pollutant duting a consecur e 

twenty-tour month period that precedes the particular date and is 

representative of normal unit operation. A different period may be use tf it is 

more representative of normal unit operation. Actual emissions shall e 

calculated using the unit's actual operating hours, production rates nd 

types of materials processed, stored or com busted or actual emi ion data 

during the selected lime period; 

I. ~ 1.b. The Division may presume that source-specific allowable e 1ssions for the 

unit are equivalent to the actual emissions of the unit only · actual emissions 

cannot be determined pursuant to Section II.A.1.a., abo ; 

II.A.1.c. F any emissions unit that has not begun normal op rations on the 

pa · ular date, actual emissions shall equal the po ntial to emit of the unit 

on th date. 

II.A.1.d. This defi 'lion shall not apply for calculating w ether a significant emissions 

increase h s occurred, or tor establishing a AL under Section X:V. of Part D 

of this regul ion. Instead, Sections II.A.3 and II.A.4. of this part shall apply 

for these purp ses. 

II.A.2. Actuals PAL 

For a major stationary source, means PAL base on the baseline actual emissions (as 

defined in Section II.A.4. of this part) o II emis ·ons units (as defined in the Common 

Provisions regulation) at the source that it have the potential to emit the PAL pollutant. 

II.A.3. Air Quality Related Value 

ange in air quality. Examples include flora, 

II.A.4. Baseline Actual Emission 

The rate of emissions. in tons er year, of a regulated N pollutant, as determined in 

accordance with Sections II . .4.a. through II.A.4.d. below. 

II.A.4.a. For any isting electric utility steam generati unit (as defined in Section 

II.A.14 of this part), baseline actual emissions eans the average rate, in 

tons er year, at which the unit actually emitted t pollutant during any 

co ecutive twenty-four month period selected by t e owner or operator 

w· in the five year period immediately preceding wh n the owner or operator 

egins actual construction of the project. The Division all allow the use of a 

different time period upon a determination that it is more epresentative of 

normal source operation. 

II.A.4.a.(i) The average rate shall include fugitive emiss1 ns to the 

extent quantifiable, and emissions associated with sta 

shutdowns, and malfunctions. 

II.A.4.a.(ii) The average rate shall be adjusted downward to ex 

non-compliant emissions that occurred while the source was 

operating above any emission limitation that was legally enforce 

during the consecutive twenty-four month period. 

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II.A.4.a.(iii) For a regulated NSR pollutant. when a project involves 

multiple emissions units, only one consecutive twenty-four month 

period may be used to determine the baseline actual emissions r 

the emissions units being changed. A different consecutive tw tyfour month period can be used for each regulated NSR poilu nt. 

II.A.4.a.(iv) The average rate shall not be based on any con cutive 

twenty-four month period for which there is inadequate · formation 

for determining annual emissions. in tons per year. a for adjusting 

this amount if required by Section II.A.4.a.(ii). 

b. For an existing emissions unit (other than an electric util' steam generating 

unit), baseline actual emissions means the average ra . in tons per year, at 

hich the emissions unit actually emitted the pollula during any 

secutive twenty-four month period selected by e owner or operator 

wit ·n the len year period immediately preceding ither the date the owner or 

oper or begins actual construction of the proje , or the date a complete 

permit plication is received by the Division r a permil required under this 

Part D. e ceptthal the ten year period shall ot include any period earlier 

\han Nove ber 15, 1990. 

II.A.4.b.(i) The average rate shal nclude fugitive emissions to the 

extent antifiable. and emis 1ons associated with startups. 

shutdow . and matfunctio s. 

II.A.4.b (iii) The av rage ate shall be adjusted downward to exclude any 

emissions lh would li ve exceeded an emission limitation with 

which the jor stationa source must currently comply. had the 

major sta · nary source b n required lo comply with such limitations 

during t consecutive twen -lour month period. However. if an 

emiss· n limitation is part or a aximum achievable control 

tech ology standard contained · Pan E ol Regulation Number 8, the 

ba line actual emissions need o ly be adjusted if the Stale has 

I en credit for such emissions re ctions in an attainment 

emonstration or maintenance plan . 

. b.('iv) For a regulated NSR pollutant, hen a project involves 

multiple emissions units. only one consec live twenty-four month 

period must be used to determine the. base· e actual emisstons lor 

the emissions units being changed. A differe consecutive twentyfour month period can be used for each regula d NSR pollutant. 

II.A.4.b.(v) The average rate shall not be based on a consecutive 

twenty-four month period for which there is inadequ e information 

for determining annual emissions, in tons per year. a for adjusting 

lhis amount if required under Sections II.A.4.b.(ii) and I . .4.b.(iii) of 

lhis part. 

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II.A.5. 

II.A.6. 

II.AA.c. For a new emissions unit, the baseline actual emissions for purposes of 

determining the emissions increase that will result from the initial constru o 

and operation of such unit shall equal zero; and thereafter, for all other 

purposes, shall equal the unit's potential to emit (as defined in Section .8.37 

of Part A of this regulation). 

II.A.4.d. For a PAL for a major stationary source, the baseline actual emi ions shall 

be calculated for existing electric utility steam generating units · accordance 

with the procedures contained in Section II.A.4.a., for other e sting 

emissions units in accordance with the procedures contain in Section 

II.A.4.b., and for a new emissions unit in accordance with e procedures 

contained in Section li.A.4.c. 

II.A.5.a. An intrastate area (and every part thereof) desi ated as attainment or 

unci sifiable under Sections 1 07(d)(1 )(A)(ii) o (iii) of the Federal Act in 

which e major source or major modification stablishing the minor source 

baseline ate would construct or would hav an air quality impact for the 

pollutant which the baseline date is es blished, as follows: equal to or 

greater tha ne microgram/cubic meter. 1 ).lg/m3) (annual average) for 

S02, N02, o M1 0; or equal to or gr ter than 0.3 )Jg/m3) (annual average 

for PM2.5. 

1 07(d)( 1 )(A)(ii) or (iii) of the Federal Act 

II.A.S.b.(i) 

II.A.S.b.(ii) Is sub· ct to is Part D, and would be constructed in the 

same state reposing the redesignation. 

II.A.5.c. Any baseline are established orig ally for the total suspended particulate 

increments sha remain in effect an hall apply for purposes of determining 

the amount o[ vailable PM1 0 increm ls, except that such baseline area 

shall not re ain in effect if the permit au ority rescinds the corresponding 

minor sou e baseline date in accordance ith Section II.A25.c. 

The ambient conce ration level that exists in the baseline area a the time of the applicable 

minor source bas ine date. A baseline concentration is determine for each pollutant for 

which a minors urce baseline date is established and shall include: 

.a. The actual emissions representative of sources in exist ce on the 

applicable minor source baseline dale, except as otherwi provided in this 

definition; and 

II.A.6.b. The allowable emissions from major stationary sources that co menced 

construction before the major source baseline date, but were no ·n operatic 

by the applicable minor source baseline date. 

II.A.6.c. The following will not be included in the baseline concentration and w1 

the applicable maximum allowable increase(s): 

CODE OF COLORADO REGULATIONS 5 CCR 1001-5 
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II.A.6.c.(i) Actual emissions from any major stationary source on whi 

construction commenced atter the major source baseline date: a 

II.A.6.c.(ii) Actual emission increases arnd decreases at any stati 

source occurring atter the minor source baseline date. 

Begin Actual Constwction 

Initiation f physical on-site construction activities on an emissions unit that a of a 

permanen ature. Such activities Include, but are not limited to, installation f building 

supports an foundations, laying of underground pipe work, and construe· n of permanent 

storage struct es. With respect to a change in the method of operation is term refers to 

those on-site ac 'vities o(her than preparatory activities that mark the i tiation of the change. 

II.A.8. Best Availa le Control Technology (BACT) 

An emission limitation · eluding a visible emissions standard) 

degree of reduction of e h regulated NSR pollutant that wo , be emitted from any 

proposed major stationary ource or major modification tha he Division or Commission, on a 

case-by-case basis. taking i o account energy, environm ntal, and economic impacts and 

other costs. determines is actf vable for such source or odification through application of 

production processes or availatl methods, systems, d techniques, including fuel cleaning 

or treatment or innovative fuel co bustion technique for control of such pollutant. In no 

event shall application of the best a ailable control chnology result in emissions of any 

pollutant that would exceed emission allowed b he applicable standards in the Code of 

Federal Regulations. Title 40, Parts 60 nd 61 egulation Number 6, Part A, and Regulation 

Number 8, Part A) as in effect on the eff tiv ate of this clause, but not including later 

amendments, unless such amendments a pecifically incorporated by reference in 

accordance with the provisions of Colorad evised Statutes Section 24-4-103 (12.5). 

Information as to the availability of such an rds may be obtained from the Director, Air 

Pollution Control Division, Colorado D artmen of Public Health and Environment. 4300 

Cherry Creek Drive South, Denver, lorado 80 6-1530. 

If the Division or Commission del rmines that techn gical or economic limitations on the 

application of measurement me odology to a particul emissions unit would make the 

imposition of an emissions st dard infeasible, it may in tead prescribe designs, equipment, 

work practices, operational andards or combination ther of, to satisfy the requirement for 

the application of best ava· ble control technology. Such s ndard shall, to the degree 

possible. set forth thee ·ssions reduction achievable by imp mentation of such design. 

equipment, work practi ~ or operation and shall provide for co liance by means that 

achieve equivalent re ults. 

Any technolo , includifl9 technologies applied at the pre-combustion. mbustion, or postcombustion age, at a new or existing facility that will achieve significant .ductions in air 

emissions f sulfur dioxi<le or oxides of nitrogen associated with the utilizat n of coal in the 

generati of electricity, or process steam which was not in widespread use of November 

15, 199 . 

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II.A.10. Clean Coal Technology Demonstration Project 

A project using funds appropriated under the heading "Department of Energy-Clean Coal 

Technology," up to a total amount of $2.5 billion for commercial demonstration of clean oal 

chnology, or similar projects funded through appropriations for the U.S. EPA. The fe eral 

co tribution for a qualifying project shall be at least twenty percent of the total cost the 

dem nstration project. 

In referenc to an application for a major NSR permit, an application that c tains all the 

information n essary for processing the application. Oesi9nating an apP. cation complete for 

purposes of pe it processing does not preclude the Division from req sting or accepting 

any additional in rmation. 

II.A.11.a. At a minimum, a complete application for permit to construct a 

major ource or major modification subject to th requirements of this Part D 

shall in de: 

II.A.11.a.(i) All onitoring data required pursu nt to this regulation and an 

analysis of a bient air quality in accord ce with Section VI.A.3. of this part; 

II.A.11 .a.(iii) A report of the re 

VIII.A.1 . of Part A; 

II.A.11.a.(iv) 1on that the roposed technological system of 

continuous emissi reduction tha ·s to be used will enable such source to 

comply continuo ly with the standa s of performance that are to apply to 

such source a that the emission inp Is to the model for the impact analysis 

are equivale to the emissions allowed such standards of performance; 

II.A.11.a.(v) s that will be installed to 

monitor e emissions of each pollutant that · I be emitted in significant 

amou s. maintaining such devices or systems. nd the schedule and format 

for r orting the results of such emission monitor g to the Division; 

II.A.11.a i) The additional impact analysis required by S ction VI.A.6. of this 

art, any demonstration of facts needed to establish a I aim by the applicant 

to qualify for any exemption or exclusion under Section .B. of this part; 

A schedule of construction in accordance with Sect1 n III.G.2. of Part 

II.A.11.a.(viii) An additional copy of the application for the federal land anager of 

each affected Class 1 area, for the U.S. EPA. for the county Comm sioner, 

and for public notice (county clerk). Two additional copies shall be su mitted 

for interested public groups. 

CODE OF COLORADO REGULATIONS 5 CCR 1001-5 
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II.A.12. Construction 

Any physical change or change in the method of operation (including fabrication. erectio 

·nstallation. demohtion, or modification of an emissions unit) that would result in a chan 

a tual emissions. 

Any part fa stationary source that emits or would have the potential to emit 

NSR poilu nt and includes an electric steam-generating unit as defined in 

this part. Fo purposes of this Part D, there are l\No types of emissions uni 

y regulated 

ction II.A.14. of 

described in 

Section II.A.1 .a. and II.A.13.b., below. 

A new emissions unit is any emissions unit t at is (or will be) newly 

tructed and that has existed for less than two ars from the dale such 

ions unit first operated. 

II.A.13 b. n existing emissions unit is any emi ions unit that does not meet 

!he requir ents in Section II.A.13.a .. abov . A replacement unit (as defined 

in Section I . .39. of this part) is an existi emissions unit. 

II.A.14. 

Any steam electric generating unit at is construct t1 for the purpose of supplying more than 

one-third of its potential electrical out ut capacity nd more than twenty-five megawatts 

electrical output to any utility power dis ibution stem for sale. Any steam supplied to a 

steam distribution system for the purpos of P. v1ding steam to a steam-electric generator 

that would produce electrical energy for s 1s also considered in determining the electrical 

energy output capacity of the affected faci · 

ll.A.15 Federal Land Manager (FLM) 

With respect to any lands of the U ecretary of the depar1ment with authority 

over such lands. 

II.A.16. High Terrain 

Any area hav1ng an elevar n nine hundred feet or more ab e the base of the slack of a 

source. 

Either a flare use to comply with an applicable new source perform ce standard or 

maximum achi able control technology standard (including uses of n es during startup, 

shutdown. or alfunction permitted under such standard), or a nare that erves to control 

emissions o waste streams comprised predominately of hydrocarbons an containing no 

more than 30 mg/dscm hydrogen sulfide. 

An system of air pollution control that has not been adequately demonstrated in p ctice. but 

uld have a substantial likelihood of achieving greater continuous emissions reduc · n than 

ny control system in current practice or of achieving at least comparable reductions a lower 

cost in terms of energy, economics. or non-air quality environmental impacts. 

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II.A.19. Low Terrain 

Any area other than high terrain . 

. 20. Lowest Achievable Emissions Rate (LAER) 

y source. the more stringent rate of emissions based on the following: 

The most stringent emission limit contained in any st e 

implementation plan for such class or category of stationa ource, unless 

the owner or operator of the proposed stationary source monstrates that 

such limits are not achievable; or 

II.A.20.b. The most stringent emission limitation that i achieved in practice by 

su h class or category of source. In no event shall ppllcation of the term 

pe 'I a proposed new or modified stationary so ce to emit any pollutant in 

exces of the amount allowable under an appli ble new source 

perform nee standard (Regulation Number 6 . 

II.A.21 .a. Any e ·ssions unit that emits r has the potential to emit one 

hundred tons pe ear or more of th AL pollutant in an attainment area; or 

II.A.21.b. its or has the potential to emit the PAL 

pollutant in an amoun hat is e al to or greater than the major stationary 

source threshold (as de ed · Section II.A.24. of this part) for the PAL 

pollutant for nonattainme reas. For example, in accordance with the 

definition of a major statio source (as defined in Section II.A.24.of this 

part), an emissions unit oul be a major emissions unit for volatile organic 

compounds if the emi ions u · is located in an ozone nonattainment area 

and emits or has the otential to mit one hundred or more tons of voc per 

year. 

II.A.22. Major Modification 

Any physical change in or c nge in the method of opera n of a major stationary source 

that would result in a signi cant emissions increase of a reg lated NSR pollutant and a 

significant net emissions ncrease of that pollutant from the m ·or stationary source. 

II.A.22.a. Any significant emissions increase from ny emissions units or net 

em· sions increase at a major stationary source t tis significant for volatile 

o anic compounds or NOx shall be considered sig 'ficant for ozone. 

In the Denver Metropolitan PM10 nonattalnme area, any net 

emission increase that is significant for su !fur dioxide or · rogen oxides shall 

be considered significant for PM1 0 . 

.A.22.c. A physical change or change in the method of operati 

include routine maintenance, repair, and replacement. 

II.A.22.d. A physical change or change in the method of operation, u ess 

previously limited by any enforceable or federally enforceable permit 

condition that was established after January 6, 1975 for sources in 

attainment or unclassifiable areas and after December 21 , 1976 for sour s 

in nonattainment areas, shall not include: 

CODE OF COLORADO REGULATIONS 5 CCR 1001-5 
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II.A.22.d.(i) Use of an alternative fuel or raw material by reason of an 

order in effect under Sections 2(a) and (b) of the Federal Energy 

Supply and Environmental Coordination Act of 1974 (or any 

superseding legislation), a prohibition under the Power Plant a 

Industrial Fuel Use Act of 1978 (or any superseding legislatlo or by 

reason of a natural gas curtailment pla1n In effect pursuant I the 

Federal Power Act; 

II.A.22.d.(ii) Use of an alternative fuel because of an order 

Section 125 of the Federal Act; 

II.A.22.d.(iii) Use of an alternative fuel at a steam-gen rating unit to the 

exlenllhat the fuel is generated from municipal olid waste; 

I.A.22.d.(iv)(A) the stationary source in nonattainment area was 

capable of accommodating pri to December 21, 1976, unless such change would be P. ohibiled under a federally enforceable permit condition, r 

II.A.22.d.(v) An increa i the production rate, unless such change 

would be prohibi d un r a federally enforceable permit condition; 

II.A.22.d.(vi) An in rease in the ours of operation, unless such increase 

would be pr hibited under a derally enforceable permit condition; 

or 

II.A.22.d.(vii) 

II.A.22.d.(v") The installation, operation. c salion, or removal of a 

1 porary clean coal technology demo stration project, if the project 

omplies with: 

II.A.22.d.(viii)(A)The Colorado State lmplem ntation Plan, and 

ltA.22.d.(viii)(B)Other requirements necessary allain and maintain 

the National Ambient Air Quality Slandar during the project and after it is terminated. 

II.A.22.d.(ix) For major stationary sources in attainment are s: 

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II.A.22.d.(ix)(A) The installation or operation of a permanent clean 

coal technology demonstration project that constitutes repowering, provided that the project does not result in Increase in the potential to emit of any regulated poll nt 

emitted by the unit. The exemption shall apply o a pollutantby-pollutant basis. 

II.A.22.d.(ix)(B) The reactivation of a very clea coal fired electric 

utility steam generating unit. 

The reactivation of a very cle 

enerating unit. 

II.A.22.e. 

II.A.22.f. Emissions c sed by indir t sources of pollution, emissions from 

internal combust' engines on any v icle, and emissions resulting from 

temporary co ruction or exploration ac · ities shall be excluded in 

hether a major modification w occur. 

Emi 10ns from on-going construction are not con · ered to be temporary 

e 1ssions. and are Included in determining whether ajor modification will 

occur. 

Fugitive emissions from the listed sources in Section II.A.24.a. d any olher 

stationary source category that, as of August 7, 1980 was regulat 

Sections 111 or 112 of the Federal Act (as adopted In Regulations . 6. 

Part A, and 8, Parts A and E) shall, to the extent quantifiable, be consi 

in calculating the potential to emit of the modification. 

II.A.23. Major Source Baseline Date 

In the case of PM10 and sulfur dioxide. Jan 

In the case of nitrogen dioxide, February 

II.A.23.c. In the case of PM2.5, October 20, 2010. 

For the purpose of determining whether a source in attainment or 

lassifiable area is subject to the requirements oft art D. major 

statio source means: 

4.a.(i)(A) Fossil fuel-fired see lectric plants of more than 

250 million British thermal units p 

II.A.24.a.(i)(B) Coal cleaning plants (with thermal drye 

CODE OF COLORADO REGULATIONS 5 CCR 1001-5