p.1 

OAR Box 1796 

Prepped by Keeia Richards 

Document Number: 

22) IV-H-45 

Docket Number: 

A-90-37 

Printed 10/31/2008 4:20:37 PM Sheet 22 of 107 
• >f

ll/19/02 TUE 10:0 2 FAX 919 541 5509 

. . %.. ... . 

V 

ovember18, 2002 3:32 PM From: Lynn Hutchinson 

11/12/200 2 13:17 FAX 919 541 4028 ITPID 

NO'vJ~12-2002 13-2 3 

P.2 

OPG IIG EPA 

Fax Number: 919-677-9457 

Win- -

A-90-3T 

IV-H-45 

To. 

Pox W: 

From; 

FAX TRANSMISSION 

OFFICE OF INFORMATION AND REeuuiTOftV AFFAIPS 

OPWCB OF MANASEMBMT ANI. Bubeer 

NATURAL RESOURCES1, ENERSV ANb ASM<*UL"nJRE BRANCH 

725 17th Street, NW, Room 10202 

Washington. DC 20503 

Office: 202-395-3084/Fax: 202-395-7285 

) Art Fraas 

) Rich Ther dux 

) Jim LalTy 

) Amanda Lee 

Farrell 

) Bryon Allen 

) AAqrgie AAolanoskl 

) David ftaatker 

) Ruth Solomon 

) Edmond Toy 

Dote: 

Pages: 

lifrzj 

^ 5 t including thiG cover sheet. 

\ l l 2002 

EPA AIR DOCKET 

Comments'-

C^-vm r •JZ -ih^kL Shis COJ~Z/$ ".4-

fM5HEHT.Nna 
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jov^M^OoT^TM^Lyn^in^ . FaxNunb,,: 919-677-9457 W*-" ^ 

' 11/10/2(11.2 13:17 FAX 919 541 402S ITPID p Q2/1S 

NOU-12-2002 13=23 

Internal , and Deliberative Drafit- Do not quote, cite , copy,. or distribute . 

October 29 . 2002 

baseline emissions determinations, • the actual-to-future-. 

actual methodology, Actuals PALs, Clean Unite, and PCPs, We 

have not made final determinations on any other proposed 

changes to the regulations. 

Today's actions finaliz e these changes to the 

regulations for both the approval and promulgation of 

implementation plants and requirements for preparation, 

adoption and submittal of implementation plants governing 

the NSR programs mandated by parts C and D of titl e 41 of 

the Clean Arlr aAct. We also proposed conforming changes to \ w 

4 0 CFR *garc 51, ftjappencULx S and -Fgart 52.24. Today we have 

not included the final regulatory language—1« for these 

regulations. I t is our intention to include regulatory 

changes that conform Appendix S and Poart 52.24 to today's 

final rule s in any final regulations that set* forth an ^ 

interim implementation strategy for the 8-hour osone 

standard. we xntend to finalis e changes to theso sections J?j 

$ 

precisely as we have finalized requirements for other parts 

of the program. Because these are conforming changes .and (**~l " J> 

have had an opportunity for, public jreview and comment. we 

will not be soliciting additional comments before we 

finalize them.— 

. The major NSR program contained iix parts c and D of 
PA_ 

• 11/19/02 TUE 10:03 FAX 919 541 5509 OPG HG EPA 1004 

U/12/20'02 13:17_FAX 919 541 4028 "PID P.03/15 

inttsisaal aad Deliberativ e DraSt- Do not quote, cite , copy,,

 o r

 distribute; 

October .29, 2002 . . 

result in an emissions increase over baseline levels. • 

The 1,-efttL'eaett toey^resa^on "any physical change . . . 

or change in the method of operation" in section 111(a) (4) 

of the Act uemld,—read. •iitiLvally, •eixccnnpaaB the moat muijdane 

at-LiviL'ie.s at yxnur- source (etfeii't'lie repair ui xe^lamumiDnL ul 

a -ftin^la leaky-pip*..1,—i^i* an inalgp-ifiL.ajii.fa1 chajj-ijc in tha way 

Li'i.a.L pinje. i.5 ntiliaedVia ^ofc tjef inad. -li+wtMin., wa have 

recognized that Congress did not intend to make every 

activity at a source subject to the major NSR program. As a' 

result, we have previously adopted several limited G>r*n*w\ s&—£-

exclusions from the^hat may constitute a "physical ox 

operational change^" Caim.jjuiu.saL o£ Llic definition. For 

instance, we have specifically recognized that routine 

maintenance, repair and replacement, and ahangee in houra of 

operation or in the production rate are not by tlieuUjaluefc 

considered a physical change or change in the method of 

operation within the definition of major modification.3 

We have likewise linLefredacidresBed the reach uf Lhe 

•SaMLujjg ateuscope of the statutory definition of modification 

by excluding all changes that do not result in an emissions 

iiioiaase aiuvc a • significant" emissions increase from a 

» 

2

 See section 40 CFR 52.21(b)(2). 

11 
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• 11/19/02 TUE 10:03 FAX 919 541 5509 _ OPG IIG EPA |gj005 

ovembeM* 2002 ~xam~ From: Lynn Hutchinson Fax Number: 919-677-9457 '*••»•' « 

* 11/12/2002 13:18 FAX 919 541 4028 ITPID _ 

NOO-12-2002 13=24 P.eM/lS 

interna l an_ Deliberative Draft- Do sot quota, cite , copy, oar diatriimto. 

October 29, 3002 

quality. "' 

6. Major NSK. Applicability 

We hava briefly described the new provisions for 

baseline actual emissions, aJtaal-to--fuLuift-acitUBilactual-topro-jected-actual methodology, PALs, and Clean Units, 

Sections II, IV, and V describe the new provision 

detail. TaJien • tuycthej.,—thcapTheat| provisions offer major 

new changes to— NSR applicability, es£»eeially regarding ho) 

a major modification is determined... \The major NSR 

applicability provisions developed over time £©« therefore 

have been added to the NSR rules in a piece&e&l fashion. In 

today's final rules we are including a new section that 

outlines how a major modification is determined under the 

various major NSR applicability options and clarifies where 

you will find the provisions in our revised rules. For each 

applicability option/ we describe how a major modification 

is determined in detail. You'll find this new applicability 

"roadmap" in §Sl.l65(a) (2) , §51.166(a) (7) , and §52.21 (a) (2) . 

To summarize, the various provisions for major modifications 

are now as follows. 

• Aaj.tual- tT.M-vepr.*iibc.ntttLlve'actual1 annual t<rgt—(•WES'CO V 

Lest)—£OJL- listing - EUgatJa- AJ^Tu'T 

* ActaUaJL-to £uLuic-a^tualActua^-to-Payo-jecced-actual f^\^i «. 

,V, 

2 6 
P_K_ 

• .11/19/02 TUE 10:03 FAX 919 541 5509 OPG IIG EPA r^ g 

Member 18. 2002 3:32 PM From: Lynn Hutchinson Fax Number: 919-677-9457 Page 6 of 16 

' 11/12/2002 13:18 FAX 919 341 4028 ITPID ©005 

NOU-12-2002 13=24 P.05/15 

Internal 'aad -Deliberative Draft- Do not quota, ..cite, aopy, o* distribute . . 

October 23, 200.2 

to install air pollution controls, 

II. ^Revisions to the Method for Determining Whether a 

Proposed Modification Results in a significant Emissions 

Increase 

A. ^Introduction 

Today we are finalizing two sets of amendments to our 

existing major NSR regulations that provide another way in 

which yon may calculate emissions increases to determine 

whether certain types of physical changes or changes in the 

method of operation (physical or operational changes) of an 

existing emissions unit trigger the major NSR 

requirements.7 The first set of amendments relates to the 

way in which you ad*€: determine your baseline actual 

emissions for such emissions units in accordance with a new 

definition of "baseline actual emissions." See, for 

example, new §52.21 (h) (48). We will be allowing you to use 

any consecutive 24-month period during the 10-year period 

prior to the change to determine your baseline actual 

By definition, the modification of an existing source ia 

potentially subject to major NSR only if that existing 

source is *major." In addition, when an existing "minor" 

source makes a physical or operational change that by itself 

ie major, that change constitutes a major stationary source 

that is subject to major NSR. [See, for example, 40 CFR 

52.21(b) (1) {c) .] 

31 
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• 11/19/02 TUE 10:04 FAX 919 541 550.9 OPG IIG EPA Q, 

wember 18, 2002 3:32 PM From: Lynn Hutchinson Fax Number: 919-677-9457 Page 7 of 16 

11/12/200 2 13:18 FAX 919 541 4028 ITPID ® 0 0 6 

" NOU-12-2002 13=25 P.06/15 

• - - . --a*-... 

mteimal and Delllberative Draft- n© not qaote, .o.ite, copy, or diatribut e k :•';v!'..0;.?-.-i^

,.iivr.>.-..• 

October-29, 2002 •'••';. •v«"iJ-5:'^S;li,;.j«^ 

emissions' for existing emissions units (other tnan-EnSGO^)'.. '/:;;^f^;^T 

The second set of amendments •JrepTBeas the existing

 nactual-' •'"v^^J.^lcir' ., 

to-potential" and

 nactual>-to-reprejgentative;-.a.c:tual—^annual :'• '•',"""!" • 

emissions" applicability tests for existing emissions units .'" 

(including EUSGUs)— with an "actual-to-projected-actual" 

applicability test for determining if a physical or 

operational change will result in an emissions increase at 

such units."__ (ETotwithstgaiding this new test, the actual-to-, 

potential methodology is still available at vqur option 

under the new applicability teste.) The new procedure for 

determining your pre-change baseline actual emissions will 

not apply to EUSGUs.* Instead, for EUSGUs we are retaining 

Throughout this preamble it is assumed that the physical, 

change or change in the method of operation is a non-routine 

change or is not otherwise exempted from review as a 

modification. 

For NSR purposes, the definition of

 ttelectric utility steam 

generating unit" means any steam electric generating unit 

that is constructed for the purpose of supplying more than 

one-third of its potential electric output capacity and more 

than 25 MW electrical output to any utility power 

distribution system for sale, Any steam supplied to a steam 

distribution system for the purpose of providing steam to a 

steam-electric generator that would produce electrical 

energy for sale iB also considered in determining the 

electrical energy output capacity of the affected facility. 

[See, for example, 40 CFR 52.21 (b) (31).] Reference in this 

notice to utility unite is meant to include all emissions 

units covered by this definition32 
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,w19/2nn2 13:19 FAX 919 541 4028 "P1D p.07/15 

£ 

^ 

Interna l 'm>4 Delib«rativ a D«a£t- Do »6 t tjnotii, cite , copy; or difltttbut'©. 

October 29, 200(J 

t h e existin g procedure s fo r determinin g th e baselin e actua l 

emissions- 1 0 [Sea, fo r example, existin g 40 CFR 

52.21(b ) (33). We axe als o affirmin g our curren t method used 

f o r calculatin g th e baselin e actua l emission s fo r EUSGUs 

I allowin g any consecutiv e 2 years i n th e past 5 years, or 

anothe r more representativ e period ) by codifyin g i t i n th e 

NSR ragxilationa . [See, fo r example, new §52.21(b) (48) .] 

-Badcr today.' s 'fina l ru-rea- we havq di^tinguish-ftd th a 

..igr-fcrudoloffies fia* ca.lculafci.rii3 th e baaglinu. actua l anLL.bfc.lu.ua 

{.cr • CUOQU.S from1 othe r •ascist-xii^ ftitiisasiuiii!; units 1 by x-udifying 

two new ,a.^plia^ulj.l-lity Leata . We letfcr1 t o th e Applicabilit y 

Leabt fo r "SU3(3t3*, aa -the -^WHPCO test " and fci- othe r ejgistring 

t^iiasioa p unit s aer the, "acluftl 1 t<o pivjacted•actua l carls si cms 

teat. " ' 

For existin g emission s units othe r tha n EUSGUs, th e 

change s we ar e making t o th e method fo r calculatin g a unit' s 

baselin e actua l emission s wil l apply onl y fo r th e followin g 

thre e purposes. • 

For modifications, t o determin e a modified unit' s pre -

change baselin e actua l emission s a s par t of th e now 

P*° 0<< 10 . \xL\- S\\?df.(* 

 10 

We promulgated special applicability rules for physical and 

operational cnanges at EUSGUs in 1992 [see 57 FR 32314, -July 

Zl, 1992] . 

33 
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11/19/0 2 TUE 10:05 FAX 919 541 5509 OPG IIG EPA 1^009 

OV^MsToC * 3:32 PM F ^ Lynn Hanso n Fax Numb.,: 919-677.9457 P*,e 9 of « ^ 

11,'12.'2IW2 13:19 ,F.« 912,

 S4 1 4 "2

'

 1T?m PUBIS 

ZXLterna.l anil DelUberafciva Draft- Do not. (juofco, oite , copy, or distribute , 

Octobax 29 , ,2002 

•"actuai-tc-f uturo' actua^^a^tua^-tq j»ro^| ected-a,ctufrl7 

test. 

» For netting, to determine the pre-change baseline 

actual emissions of an emissions unit that underwent a 

physical or operational change within the 

contemporaneous period. 

For PALs, to establiah the PAL emissions cap. 

-TVfg-mgrsxcn-'uf the * actual-^cj-piojiaic Led 'actual" 

applicability teat we, ara Adopting1 feis-day applim-a unly whan 

de-Leimiuiug if• »••taod-frldcgbion-'at an cjiis'tiug emi'-Salona milt 

(iuthe.i.- than-Taui EUOOUj—At a-majui atatiouaj-'y semi-cc. ' will 

xeault iii- a significant, eaiu-sgioira xu.cic.aae. Uei-tahci' u£ tlie 

uaiw a.L.plicaL.ilrty testa applied' to new ciui.s.si&i'n, units1. 

[3<s.-,—Bvi: &aiaiikplc, new 552.21—(te) (7) .] New •catiics-jremg- units 

Jo not hava "an'operatiojial1 liiatury on whjrch • io bass future. 

umiaaiuua projections, then-efai-e;•• the appyopi'iaLe matlnuQ £o_ 

r-at-ijunt-inij the ttluitjaiajna increaaa' fcfaat will i&aulL: from -a 

modll-ica.'fc-iun uf new umita icwLiuueb to bu Like "actual 'LupOtenL.la.±,w—Ll.j)L .-.L 

.

 J*,

5s&«>, today's-'new procedures for calculating baseline 

^•--ac.tnal-^missions and for the "actual-to-projected-actual" 

test should not be used when determining a source's actual 

emissions on a particular date as may be used for other NSR34 
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. 11/19/02 TUE 10:05 FAX 919 541 5509 OPG IIG EPA BlOlO 

o v e -lr, 8 .200 2 3:32P M F,o„,: Lynn Hu«cMnson Fa, N-n.be,: 9,9*77-9«7 P-l-J ^ 

11/12/2002 13:19 FAX 919 541 4028 ITPID 

Interna l 'and Deliberative Draft- So not <xa<?tn, sifco, copyv or di. a tribute . 

October 29, 2003 

I n addition , today' s change s provid e benefit s t o th e 

publi c an d th e environmen t b y iiupvuvin y tl m (juyriintthroug h • 

t h e improve d recordkeepin g an d reportin g requirementSTrffnder th e Actual-to-prT3jttct&4vacLual--l.,aS.bb, yum a m t u kee p 

tr -recor d -of your-fatui c ejui'Jaiaiia.;- pi/ojacL 'and trac k you i 

poa t chang e emiasion a an d icfaai n thos e L-e-curdj1 o n Bit g fax—5 

yea r a—(10 yean s .tn ctsi tai n ca.5es}-T'

r

 from the-date-yo u retur n 

t o regulajL. opelatibn . Tkaat* recorA s wil l cnaJjl c yo u an d 

yo\i_- retfiewinL) a.utlioiil: y t o 'ensur e tha t tli e physical-o r 

opiMraftii»nal--c'hzqngeg—thaHr wer e rnttdtf- du ixol exuee d yo n 

baae-Jhiiie.' autua l emi-sswnB u r tMl:h&CTwiae eontxadigt -

•& iirfuimaLiuM relie d -va teg1 auppoi'fc -your- L-amijliana-c warfcfa—majoj.-

H3R Jiegalwijicjaai.—-gf yo u de.L-crn.iiie>1—dur.Lugr—the- 0 u r ID yeai a 

u l I'gnjuiicfl leuuidXe-iaiplug; tha t th a dian^es-yo u mad e t o "your 

•f'etcili'tygftsulL i n c-mi-aaiong. • tha t ar c highei 1 • Lhan yo m 

initi-a l pi*ujc£ liana - amd wsur t i-ir a. signifiuan t -cmiasion s 

isn-x-e.ua-, yaju-muab .babfl.it a i1 ft.pu.it' I n you r icviewiuff 

authaiit y iloeuinetiLinci -Uliiny uevmrauce- . 

—L. as &i scjssed abpve.; We believe that these added 

recordkeeping and reporting measures will provide the 

information necessary for reviewing authorities to assure 

that such changes are made consistent with the Clean Air Act 

requirements . j Thja new rule a,lso rdoes t not ^atf f t^ct the way in 
P.11 

H/19/0 2 TUE 10:06 FAX 919 541 5509 OPG TIG FPA 

o'vember 18, 2002 3:32 PM From: Lynn Hutchinson Fax Number: 919-677-9457 Page 11 of 16 

11/12/2002 13:20 FAX 919 541 4028 ITPID ® 010. 

MOU-12-2002 13:26 P.10/15 

Xx.te.xT.a.1 and Dellbaratlvd Draft- SQ not quota, .cite , aapy, dr distribnfc«-

pctob*r 29, 2002 

the difference between the pre-change -and post-change aatual 

emissions equaled or exceeded the significant emissions rate 

defined for a particular pollutant, major NSR would have 

been triggered {unless you wt&e took enforceable lim^t^ to 

keep the increase bplow significant, levels ^ r otherwise able 

to net out of review using creditable, contemporaneous 

emissions increases and decreases occurring at your 

facility.) If the difference between baseline and future 

actual emissions did not exceed the applicable significant 

emissions rate, your facility would haviL gvTjidedno,t.B1be 

subject to major NSR, but you would have been required to 

accept a temporary emissions cap based on the predicted 

future actual emissions for each affected pollutant at the 

emissions units being modified or affected by the 

modification. 

The temporary cap would have become a legally 

enforceable condition of a preconstruction permit. Also, 

the sole •purpose of the temporary cap would have cadgLed 

solely fivi 'Llie pmrpuoe of demariatratinirbidgn to majcp sure 

that the physical or operational change did not result in a 

significant emissions increase, and would have applied to 

those emissions unite for at least 10 years after the 

changes were completed. To--facilibah&-i-compliaire*r;—y^ou 

50 
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^ ,.. ^ *>» « —*-; " —- — p — a

6

0 1 1 

11/12/2002 13:20 FAX. .914,541 4023

 I1FU ' P.11'15 

Interna l >and Deliterative Draft- Bo not guote, cite , *opy,

 o r

 distribute . 

October.29, -200^. 

would a|lsoi have been required tQ supply information annually 

to demonstrate that the.future actual emissions did not 

exceed the applicable amissions caps during the 10-year 

period following the modification. 

3. Summary of Major Changes in the Pinal Rule 

Today's action amends the existing NSR regulations to 

provide fnwr-you with additional a .common applicability testsfor major. modifications -based- on- the -"WEfeo fa^st*—foi EUSGtsa 

.and ona^l eyiatincri emission^ unj^ts - the "actual-topro jected-actual" test fur all-other existing em-iabsiojAS 

yrrirL-s-—Both new teat A caiifcaina- elements--that differ, ^hig 

test has changed i.n some ways Srom both the 1996 NPRM and 

the 1998 NOA. &s described in greater detail in sections 

II,C and II-D below, the key features of the methodology are 

aa follows: 

• If you are an existing emissions unit (other than an 

EUSGU), you will determine the pre-change (baseline) 

actual emissions by calculating an average annual 

emissions rate, in tons per y&&r, using any consecutive 

24-months during the 10-year period immediately 

preceding the change. This rate may need tumua_t: be 

adjusted flowr^»7ard | to reflect current. ciuiabion faL,tai3. 

••—'•••If—y&u are. .m gAJptlna L-miaaionA mill.—(• inc. lulling 

51 
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11/19/02 TUE 10:06 FAX 919 541 5509 OPG IIG EPA 

oyember 18, 2002 3:32 PM From: Lynn Hutchinson Fax Number: 919-677-9457 

11/12/2002 13:2(1 FAX 919 541 402S ITPID 

Page 13 of 16 

12)012 

P.12/15 

2] 013 

• 

Inteanaal '—*& Deliberative Draft- Do not ijaot*, cita, copy,, or distribute. 

October 29, 2002 

me-tliud Cues no t -apply t o EUflQU whaax calualafcing 

^unttMitparanaom. eiiii&feionfl iliainjes fo r netting - j^ ui peseta .-

g e e iia--Jb;cu4mi^ii in—aei,tion I I .B of thi-5. preamble-.) 

-• We-are. changing th e -fttnisgiuna -projeiitiu n procedure*, for 

EUflqUs t u ullaw <t "uofclqe aiid-gia,f process gathe r tha n 

Leuiaa.riniai""tlbfl.t • the f o r Bp5GUsrfii 

If jfou ar e a^exiftin g emission s uni t ^includin g 

EDSGDELVO U vi_l/ eA£Jcte&*z* -post - change emissions;, 

/pyo i acte d actua^. emissions)._, iri^tons pe r 

rejec t any increas e in| annuajl^ emission s tha t may 

resul ^ from th e pro-ppsed qhanqe . You shoul d exclude . 

i n calculatin g anv increas e i n ^mission s tha t result s 

from th e particula r project , thgit porjbion aof t-.hfe units ' 

emission s fo^lowlncr th e projec t tha t an existin g U/ijit 

coul d have accommodated durin g th e baselin e perio d and 

thag; ar e a^,so .m-raj, ate d t o tfoe pa^ticu^L'ar proieat^ . 

jlncrease-^ utilizatio n duig t o pjrodu^t 

_~ -ynw iZ'ytL. -t^s *~*^J-T*<MJ ft j -s 

rirafriand qrowtty^l ""Xbu must m^jce th e projectio n befor e you 

fiecrin ,actua l construction. ^ U^liig thi s jMaLhTJd;. vou 

must racpr d th e p^-onegtioiiiand certai n ^pcher, 

informati c ;»jaati7n5|afgr.ra3£m.-m; ggj^er e is 

result in a 

in • addicion. ,Eusqu^. it^« ~ 

tf- uou. CM.eL a***-' 
P.14 

11/19/02 TUE 10:07 FAX 919 541 5509 OPG IIG EPA 

ovember 18, 2002 3:32 PM From: Lynn Hutchinson Fax Number: 919-677-9457 

n/i2/2002_i3iUJ 7 A £Ji. 9.

 54 1 402 S ITPI D 

Page 14 of 16 

(21013 

P.13/15 

©014 

Interna l and peUfcerativ* p-rnSt- Do not quot«, eibe , copy, or dJiBtribvto, 

October 29, 2002 

mus'jt .^eent^ a ..copy, of j:he,) aprgj ec t ion s „and ^otha r 

i n f ormatipg. foM tfheif \eviewin g authorit y 

qeteJTitinatiorEbefoye p^innin g .actua l constructfron . 

If., for,, a ^roiy t i^t ap existing - amission s .unit a t a 

yaior, stationary M IBource . you ,eleq,t t o usa> th e a actual -

to^pro_-}ecte,(3[-actual_ emissipn e teat , we ,ar e .filsq 

requiyinq B you,,t o maintai n informatio n .on your ,post„-

chant^e |gjTflssitj)ns.i|i||,for; 5 years followilng a i M phvsica l or 

opyatiipna l | cha^icre^^or j.n some easea^ f o r ,10 yar a 

dependin g on th e nature,,, of th e change . jEf your annua l 

emission s .exceed th e baselin e actua l emission s by. a 

significan t jmoun t and aj. so ^xcee d your pro-^ectior}. you 

must report^ thi,s infonnatio n tc^yqu ^ reviewingauthorit y withi n 6 0 days after^the,en d pf fefre calenda r 

year . 

gusqq s urajng^ th e ,actuial-Tpo-pr/>ie_cted--|.ctual emissipn s 

tes t must repor t tht°ir post-chancre t*piisBJona t o 

reyiew^anq authpritieajwithi n §p day s a f ter, , the , eat^ of 

£{?,?

 c ^ -len 91

^ ' l l Year

B,

wit

,

h<aV-?F, re?,fT

^" %° whethe r such 

emission s exceed.. th o baselin e a^tua^em^ssiop s ap 

projecte d actua l erni^gitym. 

lInsti

,ead,_of Pjp-jeet|rvq. .you^post-ch^nae^eini^sion p . a^.l 

existin g enu.asipnjp_unita ,n.aavMinst.ea.d jroiec t post -

TM 

• 

54 
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— -•- —t 

ovember 18,2002 3:32 PM 

11/12/2002 13:21 FAX 919 541 4023 

OPG IIG EPA 

From: Lynn Hutchinson Fax Number: 919-677-9457 

ITPII) 

Page 15 of 16 

©014 

P.14/1S 

@ 0.1.5 

^_w 

Sataxnal.'and Selib»xativti. Draft- So not quota, eibe, copy,, ot distributa. 

October.2ff,.2002 

chancre .emission^ 09 the basis flf vour,, poet^change / 

potential Ipo.emit. „ If, vou use thifl migt-hfid. .you need f flgJPTM 

jlfyts. ibrack or report y9ur post -change,, pmi a sipns. f 'orAs discussed earlier, IT11 1 m 1 nnlY 1 < HJDI HM I I UII I provided 

that when your emissions unit, other than an electric 

utilit y steam generating unit (EUS<3tI) , "has not begun normal 

operations," actual emissions equal the PTE of the unit. 

There/raas- been considerable issues raised with when- a ticuTce 

-"•this approach. For example,, uaing^potential to emit, as a 

measure of posfc-cfrange emissipna , automatic ally a^tr^butea 

all, possible em^gsiona, incraasep, to the change. There are 

m^iv,cages,. however, where, th,ia simply is not ^nie . 

Moreover. when fche acfoia!}.-tq-pqtenfria!j. t^Btniis jappj-isd it;, ,16 

automatically assumed that l^he ,emlp_si.png unit, has not begun 

normal operations." We ^fc-making affcer the change today 

toperiod. In many,, such caa^s, Jiowevey. the change^, unit „aa 

ai[nract^cal), ma^ttef

 w,^-11

, function essentially as i t did 

before t^,e cfrar^cre., We are,, therefore, allowing all existing 

em^ss^onB unfits, toi us,e an actual-to-projected-actual 

emission^ test- tig- claniiviati the' aa-ppliciaabiAifey-of • that teem 

In cucx-y ^Jiuntioa of NOR-except the-netting procedures . 

Accordingly we, are eliminating the term- "bt^cran nqrmajl 

operations* from the, d^teyirtination of whether a change, 

55 
ove 

— _ PJ6_ 

11/19/02 TUE 10:08 FAX 919 541 5509 OPG. IJG EPA ioi 6 

U/12/2002 13:21 FAX.919J541 4028 "PI D p. 15/15 

tnfcnniAl sag Dalibera-tiva Draft- Do not quote, cite , copy, .ox dlfltribnta,, 

October 29, 2002 

Today's new requirementB require that yoiito Velect, 

athe same, single consecutive 2-4-montb. period within the 10-

year look back period to calculate the baseline actual 

emissions for gachal^l existing emissions unit that will be 

AirecLed-bv -the ai'iirienLchanged. [See, for example, new 

§52.21(b) (48) (ii) (e.) -] It £&-llowsTh,e result will be that 

the baseline actual emissions for each affected pollutant 

alam mustwill, be based on the same consecutive 24-month 

period as well. 

You will have the option to select the single 24-month 

period that best represents the collective level of 

operation (and emissions) for your existing emissions unite. 

If a particular existing emissions unit did not yet exist 

during the 24-month period you select to calculate the 

baseline actual emissions, you must count that emissions 

unit's emissions rate aB zero for that full period of time. 

If an emissions unit operated for only a portion of the 

particular 24-month period that you select, you must 

calculate its average annual emissions rate using an 

emissions rate of zero for that portion of time when the 

unit was not in operation.— 

For new emissions units (a unit that has existed for 

less than two years) that will be -£•EmcLa^c^a-n^^r. by the 

63 

TOTAL P.15