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# OAR Box 1796 Prepped byKeeiaRichards



### Document

Number: 

# 43 ) IV-H-6

9 Docket Number: 

# A-90-3 7

Printed 10/31/20084:20:37

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Interna l an dDeliberativ e Draft
- D o no t quote , cite , copy , o r distribute . Novembe r 19 , 200 2 bindin g fo r a 10-yea r perio dth e emission s level s use di n projectin g futur e actua l emission s followin g th e modificatio nfo r al l sourc e categories ; an d(3 ) eliminate d th e deman dgrowt hexclusio nfo r calculatin g a modifie d emission s unit' s futur e actua l emissions . Consisten t wit hth e 199 6 NPRM , thi s alternativ e methodolog ywoul dhav e applie dt o anyexistin g emission s uni t a t a majo r stationar ysourc e fo r whic hyo u migh t pla na non-routin e physica l o r operationa l change . Th e methodolog y woul dhav e require d yo u firs t t o determin e whic hemission s unit s wer e bein g changed , o r wer e affecte dbyth e change , the nt o calculat e thos e units ' baselin e actua l emission s base do nth e highes t consecutiv e 1 2 month s o f sourc e operatio ndurin g th e pas t 1 0 years , adjuste dt o reflec t curren t emissio nfactors . Th e secon dste p involve dth e forecas t o f futur e emission s resultin g fro mth e physica l o r operationa l change . Unde r thi s calculatio no f futur e actua l emissions , mT e woul d no t hav e bee nallowe dt o exclud e predicte dcapacit y utilizatio nincrease s tha t wer e du e t o deman dgrowth . I f th e differenc e betwee nth e pre-chang e an dpost-chang e actua l emission s equale do r exceede dth e significan t emission s rat e define dfo r a particula r pollutant , majo r NS Rwoul dhav e 4 6

2 " d9IE8-9I6-E02 , si^ O ' S ae i BQO^ D ZQ 2 2 AO MP. 4

Interna l an dDeliberativ e Draft
- D o no t quote , cite , copy , o r distribute . Novembe r 19 , 200 2 Today' s actio namend s th e existin g NS Rregulation s t o provid e yo u wit ha commo napplicabilit ytes t fo r al l existin g emission s unit s —th e "actuteri:—to projected

actual"actual-to-proiected-actua l applicabilit ytest . Thi s tes t ha s change di nsom e way s fro mbot hth e 199 6 NPR Man d th e 199 8 NOA . A s describe di ngreate r detai l i nsection s II. C an dII. D below , th e ke yfeature s o f th e methodolog yar e a s follow s : ' I f yo u ar e a nexistin g emission s uni t (othe r tha na n• EUSGU) , yo u wil l determin e th e pre-chang e (baseline ) actua l emission s bycalculatin g a naverag e annua l emission s rate , i ntons—perr—yea r tpy , usin g any consecutiv e 24—moiifchs2 4 month s durin g th e 10-yea r perio dimmediatel yprecedin g th e change . Thi s rat e mus t b e adjuste ddownwar dt o reflec t an y- 1 eg.aJr^jyE / enforceabl e emissio nlimitation s impose dafte r th e selecte dbaselin e period .

• W e ar e codifyin g th e "-2—y e ars—in—5- " 2-in-5-years " presumptio nfo r calculatin g th e baselin e actua l emission s fo r EUSGUs . I f yo u ar e a nexistin g emission s uni t (includin g EUSGUs) , yo u wil l estimat e post-chang e emission s (projecte dactua l emissions) , i nton s per—ye-ar-tpy , t o 4 8

E - d 9IE8-9I6-E0 AS T ^ 0 ' S aa i B D O:_ O 2 0 2 2 *° WP. 5

Interna l an dDeliberativ e Draft
- D o no t quote , cite , copy , o r distribute . Novembe r 19 , 200 2 reflec t an yincreas e i nannua l emission s tha t ma y resul t fro mth e propose dchange . Yo u shoul dexclude , i ncalculatin g an yincreas e i nemission s tha t result s fro mth e particula r project , tha t portio no f th e unit' s emission s followin g th e projec t tha t a nexistin g uni t coul dhav e accommodate ddurin g th e baselin e perio dan d tha t arei s als o unrelate dt o th e particula r project , includin g an yincrease dutilizatio ndu e t o produc t deman dgrowth . Yo u mus t mak e th e projectio nbefor e yo u begi nactua l construction . Whe nusin g thi s method , yo u mus t recor dth e projectio nan dcertai nothe r informatio ni ncircumstance s wher e ther e i s a reasonabl e possibilit ytha t a chang e ma yresul t i na significan t emission s increase . I naddition , EUSGU s mus t sen da cop yo f th e projection s an dothe r informatio nt o theiryou r reviewin g authorit ybefor e beginnin g actua l construction . If , fo r a projec t a t a nexistin g emission s uni t (othe r tha na nEUSGU ) ..a t a majo r stationar ysource , yo u elec t t o tr^e—the—actual—to—projected—actualoroiec t you r post chang e emissions—te-s-t , w e ar e als o requirin g yo u t o maintai ninformatio no nyour—post—changethes e emissions , fo r 5 year s followin g a physica l o r 4 9

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### ^9° Interna l an dDeliberativ e Draft
- D o no t quote , cite , copy , o r distribute . Novembe r 19 , 200 2 operationa l change , o r i nsom e case s fo r 1 0 year s dependin g o nth e natur e o f th e change . I f you r annua l emission s excee dth e baselin e actua l emission s b ya significan t amoun. t an dals o excee dyou r projection , yo u mus t repor t thi s informatio nt o you r reviewin g authorit ywithi n6 0 day s afte r th e en do f th e calenda r

• EUSGU s ^sing—tire—actua l - to—pro j acted—actual—emission s tes t laust—report—thei r I f yo u projec t post-chang e emission s fo r EUSGUs , yo u mus t repor t thes e emission s t o you r reviewin g authuritiesauthorit ywithi n6 0 day s afte r th e en do f th e calenda r yea r withou t regar dt o whethe r suc hemission s excee dth e baselin e actua l emission s o r projecte dactua l emissions

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### y/ t o reoor t emission s fo r u p vo-• 10 " year s fallowing ? th e

chang e i f it.-de'termine s tha t Vhi s perio d\i s mor e

• " rea?:^kej^&atrxv s or " norma l sourc e opgr-a-fe-i-Gai . Instea do f projectin g you r post-chang e emissions , fo r al l existin g emission s unit s yo u ma yinstea dprojec t post-chang e emission s o nth e basi s o f yottreac hunit ' s post-chang e potential—t o switPTE . I f yo u us e thi s method , yo u nee dno t trackrecor d you r projection s o r 5 0

S- d 9TE8-9IB-E0Z . SII O ' S 33 1 eoor^ O 2 0 2 2 «° WP. 7

Interna l an dDeliberativ e Draft
- D o no t quote , cite , copy , o r distribute . Novembe r 19 , 200 2 retrac k o r repor t you r post-chang e emissions . A s discusse dearlier , th e curren t regulation s provid e tha t whe nyou r emission s unit , othe r tha na nelectri c utility—steam—generating—unit—(-EUSGU-)- , "ha s no t begu nnorma l operations, " actua l emission s equa l th e PT E o f th e unit . Ther e ha-s-v

e bee nconsiderabl e issue s raise dwit hthi s approach . Fo r example , usin g potential—t o emitPT E a s a measur e o f post-chang e emission s automaticall yattribute s al l possibl e emission s increase s t o th e change . Ther e ar e man ycases , however , wher e thi s simpl yi s no t true . Moreover , whe nth e actual-to-potentia l tes t i s applied ^ i t i s automaticall yassume dtha t th e emission s -uni t ha s no t begu nnorma l operation s afte r th e chang e period . I nman y suc hcases , however , th e change duni t a s a practica l matte r wil l functio nessentiall ya s i t di dbefor e th e change . W e are , therefore , allowin g al l existin g emission s unit s t o us e a nactual-to-pro j ected-actua l eniissionsapplicabilit vtest . __(__J Accordingly^ , w e are/eliminatin g th e ter m"begu nnorma l operations".fro mth e determinatio no f whethe r a chang e result s i na significan t emission s increase. 1 7

1 7 W e d o mak e us e o f th e ter m"resume s regula r operations " (a s oppose dt o "norma l operations" ) i nth e fina l rule
- &j _ bu t tha t ter mha s a ver ydifferen t meanin g an dw e ar e usin g i t fo r a nentirel ydifferen t purpose . Specifically , w e ar e 5 1

g-o l 9IE8-9TG-E0 i s ? ^ 0 " S « H eiO'-LO 2 0 2 2 «o UP. 8

Interna l an dDeliberativ e Draft
- D o no t quote , cite , copy , o r distribute . Novembe r 19 , 200 2 Fo r essentiall yth e sam e reasons , whil e ou r 199 2 rule s di dno t authoriz e us e o f projection s i nevaluatin g whethe r replacemen t o f a nexistin g emission s uni t (whic hw e understoo dt o requir e applicatio no f th e NSP S 5 0 percen t cos t threshold ) constitute s a majo r modification , upo n reflectio nw e hav e decide dthi s exceptio nt o th e availabilit yo f th e "actual—to-projected-actual"actual-to

proiected-actua l applicabilit ytes t i s als o unnecessary . I n ou r 198 0 rulemaking , w e decide dagains t differentiatin g betwee n"reconstruction""reconstruction, " eve no f entir e sources ^ an d othe r modification s fo r th e purpose s o f ou r PS D rule s o nth e groun dthat ^ a s t o existin g source s tha t woul d no t otherwis e b e subjecte dt o PS D revie wa s a majo r modificatio n(i.e. , suc hsourc e woul dno t caus e a significan t ne t emission s increase) , i nth e PS D context , change s tha t ha dn o emissio nconsequence s shoul dno t b e viewe da s modifications , regardles s o f thei r magnitude. 1 8

no t usin g irtth e ter mfo r purpose s o f determinin g whethe r a chang e result s i na significan t emission s increase . Rather , w e us e i t onl yt o identif yth e dat e o nwhic howne r o r operato r mus t begi ntrackin g emission s o f change dunit s whe n usin g th e "actual—to-projected-actual"actual-to-pro i ected
actua l methoil , 1 8 Th e 198 0 rulemakin g als o discusse dtha t "reconstruction " woul dhav e onl ybee napplie do na plantwid e basi s an dEP A believe dtha t ther e woul db e fe winstance s o f plantwid e

p or*- ft*' £.'<* 9T E8 - 9IG- E0£ SI1 0 " S 99 1 BID^ D 2 0 2 2 rtOKJP. 9

Interna l an dDeliberativ e Draft
- D o no t quote , cite , copy , o r distribute . Novembe r 19 , 200 2 Whe nyo u calculat e th e baselin e actua l emission s fo r a n existin g emission s uni t (othe r tha na nEUSGU) , yo u ma y selec t anyconsecutiv e 2 4 month s o f sourc e operatio nwithi n th e pas t 1 0 years . Usin g th e relevan t sourc e record s fo r tha t 24-mont hperiod , includin g suc hinformatio na s th e utilizatio nrat e o f th e equipment , fuel s an dra wmaterial s use di nth e operatio no f th e equipment. , an dapplicabl e emissio nfactors , -yo u mus t b e abl e t o calculat e a naverag e annua l emission s rate , i nton s per—yeartpy , fo r eac h pollutan t emitte db yth e emission s uni t tha t i s modified , o r i s affecte db yth e modification . Th e ne wrequirement s prohibi t yo u fro mtakin g creditcountin g a s par t o f th e baselin e actua l emission s -fo r anypollutio nlevel s tha t ar e no t legall yallowe dunde r any leqaljr yenforceabl e limitation s an dtha t appl ya t th e tim e o f th e project . Therefore , yo u mus t identif yth e mos t curren t l^egfl^l-

yenforceabl e limit s o nyou r emission s unit . I f thes e -xL&^aririyenforceabl e emissio nlimitation s and operatin g restriction s ar e mor e stringen t tha nthos e tha t applie ddurin g th e 24-mont hperiod , yo u mus t adjus t downwar d th e averag e annua l emission s rat e tha t yo u calculate dfro m th e consecutiv e 24-mont hperio dt o reflec t thes e curren t restrictions . (Se e sectio nII.C. 5 o f thi s preambl e fo r 5 4

8 - d 9TE8-9I6-E02 , s ! * 0 ' S 99 1 ^TO-A O 2 0 2 2 «° WP.1 0

Interna l an dDeliberativ e Draft
- D o no t quote , cite , copy , o r distribute . Novembe r 19 , 200 2 the nyo u mus t selec t anothe r consecutiv e 24-mont hperio d withi nth e 10-yea r loo k bac k perio dfor
- whic hyo u hav e adequat e data . 5 . Fo r a nexistin g uni t (othe r tha nEUSGUs) , whe nmus t I adjus t mycalculatio no f th e pre-chang e baselin e actua l emissions ? Today' s amendment s requir e yo u t o adjus t th e averag e annua l emission s rat e derive dfro mth e selecte d24-mont h perio dunde r certai ncircumstances . Specifically , yo u mus t adjus t downwar d thi s averag e annua l rat e i f an y-lcgal3>y » enforceabl e emissio nlimitations , includin g bu t no t limite d t o anyStat e o r Federa l requirement s suc ha s RACT , BACT , LAER , NSPS , an dNationa l Emissio nStandard s fo r Hazardou s Ai r Pollutant s (NESHAPJ. / restric t th e emission s unit' s abilit yt o emi t a particula r pollutan t o r t o operat e a t level s tha t existe ddurin g th e selecte d24-mont hperio dfro m whic hyo u calculat e th e averag e annua l emission s rate . Fo r example , assum e tha t durin g th e selecte dconsecutiv e 24
- mont hperio dyo u burne dfue l oi l an dyo u wer e subjecte dt o a sulfu r limi t o f 2 percen t sulfu r (b yweight) . Today , yo u ar e onl yallowe dt o bur nfue l oi l wit ha sulfu r conten t o f 0. 5 percen t o r less . Consequently , yo u woul db e require dt o adjus t you r preliminar ycalculatio no f baselin e actua l 5 7

B- d 9TE8-9IG-E02 . s ^ ° " S « H "20^ 0 2 0 22 . AO MP.1 1

Interna l an dDeliberativ e Draft
- D o no t quote , cite , copy , o r distribute . Novembe r 19 , 200 2 emission s fo r sulfu r dioxid e (SO, ) (tha t is , substitut e th e lowe r sulfu r limi t int o th e emission s calculation^ , yieldin g a 7 5 percen t reductio ni nth e emission s rat e fro mth e initia l calculation ) t o reflec t th e curren t restrictio n allowin g onl y0. 5 percen t sulfu r i nfue l oil . Th e origina l averag e - annua l utilizatio nrat e woul dno t b e adjuste dunles s a mor e stringen t J^ejxaJr^ yenforceabl e operationa l limitatio n ha s sinc e bee nimpose dtha t restrict s tha t rate . Yo u mus t als o adjus t fo r rfr&q-aTl venforceabl e emissio n limitation s yo u ma yhav e voluntaril yagree dto , suc ha s limit s yo u ma yhav e take ni nyou r permi t fo r netting , emission s offsets , o r th e creatio no f Emissions—Reductio n Credits—(-ERCs-)- . Also , yo u mus t adjus t you r emission s fro m th e 24-mont hperio di f a ra wmateria l yo u use ddurin g th e baselin e perio di s no wprohibited . Fo r example , yo u ma y hav e use da pain t wit ha hig hsolven t concentratio ndurin g a portio no f th e consecutiv e 24-mont hperiod . Today , yo u ar e prohibite dfro musin g tha t particula r paint . Yo u mus t the n adjus t you r emission s rat e t o reflec t th e ra wmateria l restriction . 6 . Ho wshoul dI calculat e th e baselin e actua l emission s fo r emission s unit s (othe r tha nEUSGUs. ) tha t us e multipl e fuel s o r ra wmaterials ? 5 8

0 I . d 9IE8-9IG-E0 As ^ 0 " S 9* 1 B 2 0 : _ Q 2 0 2 2 "o WP.1 2

Interna l an dDeliberativ e Draft
- D o no t quote , cite , copy , o r distribute . Novembe r 19 , 200 2 Fo r a nemission s uni t tha t i s capabl e o f burnin g mor e tha non e typ e o f fuel , yo u mus t relat e th e curren t emissio n factor s t o th e fue l o r fuel s tha t wer e actuall yuse ddurin g th e selecte d24-mont hperiod . Fo r example , whe ncalculatin g th e baselin e actua l emission s fo r a nemission s uni t tha t burne dnatura l ga s fo r a portio no f th e 24-mont hperio dand fue l oi l fo r th e remainder , yo u mus t retai ntha t fue l apportionmen t (fo r example , natura l ga s t o fue l oi l ratio) , bu t yo u mus t als o us e th e curren t l-aq-aj^jr yenforceabl e emissio nfactor s fo r natura l ga s andfue l oil , respectively , t o calculat e th e baselin e actua l emissions . If , however , yo u ar e n o longe r allowe do r abl e t o us e on e o f thos e fue l types , the nyo u mus t mak e you r calculation s assumin g us e o f th e currentl yallowe dfue l fo r th e entir e 24-mont hperiod . Yo u mus t us e the
- sam e approac hfo r emission s unit s tha t us e multipl e feedstoc k o r ra wmaterials , whic hma yvar yi nus e durin g th e unit' s ongoin g productio nprocess . 7 . Ho wshoul dI calculat e th e baselin e actua l emission s fo r constructio nproject s tha t involv e multipl e units ? Today' s ne wrequirement s requir e tha t yo u t o selec t th e sam e singl e consecutiv e 24-mont hperio dwithi nth e 10-yea r loo k bac k perio dt o calculat e th e baselin e actua l emission s fo r al l existin g emission s units

_tha t wil l b e changed . 5 9

I I - d 9IE8-9I6-E0Z . si^ D 'S 99~ 1 B20:£ 0 2 0 2 2 ^°k JP.1 3

Interna l an dDeliberativ e Draft
- D o no t quote , cite , copy , o r distribute . Novembe r 19 , 200 2 today' s revise drule ? Today , w e ar e amendin g th e majo r NS Rrule s t o enabl e yo u t o us e a napplicabilit ytes t tha t i s simila r t o th e applicabilit ytes t tha t currentl yapplie s t o EUSGU ^ (tha t is , th e actual-to-representative-actual-annua l emissions ^ test) . Th e ne wtes t allow s yo u t o projec t th e post-chang e emission s o f al l modifie dexistin g emission s unit s (includin g EUSGUs, ) i nth e sam e manner . Tha t is , unde r today' s ne wprovision s fo r non-routin e physica l o r operationa l change s to existin g emission s units , rathe r tha n basin g a unit' s post-chang e emission s o nit s PTE , yo u ma y projec t a nannua l rate , i nton s per—yeartpy , tha t reflect s th e maximu mannua l emission s rat e tha t wil l occu r durin g any uyj<ic LUrcJ 3 f "^' t ^'< V one o f th e 5 (o r /TO ) calendar—year s immediatel yafte r th e physica l o r operationa l change . -f-Th e firs t calenda r yea r begin s o nth e da yth e emission s uni t resume s regula r operatio nfollowin g th e chang e andinclude s th e 12-months1 2 months , afte r thi s date.j

—Thi s projectio no f th e unit' s maximu m

annua l emission s rat e followin g th e chang e i s define da s th e "projecte dactua l emissions " (see , fo r example , §5 2 .2 1 (b ) (48 ) ) , an dwil l b e base do nyou r post - -/.//^i j chang e designNg^^^ma-xilm]im : --e^^e ; c-tG d >4itii i action—ra-£ e les s any amoun t o f emission s tha t coul dhav e bee naccommodate ddurin g 6 3

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Interna l an dDeliberativ e Draft
- D o no t quote , cite , copy , o r distribute . Novembe r 19 , 200 2

f \ 

# *'i 

# V>'

) th e selecte d24-mont hbaselin e perio dan di s no t fs—2L^^d t th e change . Accordingly , yo u wil l calculat e th e unit' s \

_$>y projecte dactua l emission s a s th e produc t of : (1 ) th e hourl yj_ o 'v ' emission s rate , whic hi s base do nth e emission s unit' s s operationa l capabilitie s followin g th e chang e (s) , takin g int o accoun t •h^a^L^v enforceable restriction s tha t coul d rfio°f 

### L

affec t th e hourl yemission s rat e followin g th e change(s) ; an d(2 ) th e projecte dleve l o f utilization , whic hi s base d o nbot hth e emission s unit' s historica l annua l utilizatio n rat e an davailabl e informatio nregardin g th e emission s unit' s likel ypost-chang e capacit yutilization . I n calculatin g th e projecte dactua l emissions , yo u shoul d conside r bot hth e expecte dandth e highes t projection s o f th e busines s activit ytha t yo u expec t coul db e achieve dand tha t ar e consisten t wit hinformatio nyou r compan ypublishe s fo r business-relate dpurpose s suc ha s a stockholde r prospectus , or.application s fo r busines s loans . Whe n determinin g projecte dactua l emission s befor e beginnin g actua l construction , vo u mus t projec t th o highes t annua l tha t th e emission s unit s (includin g EUSGUs ) tha t ar e bein g change dw^rl^achiev e &fi-se4€ftey'~ro c UH^"" r ^F^ :maJ=^~ " ' ~ — - ^ operation

- Fro mth e initia l calculation , yo u ma ythe nmak e th e appropriat e adjustmen t t o subtrac t ou t anyportio no f 6 4

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## s n o * s 99 1 ^EO-LO2 02 2*°k lP.1 5

Interna lan dDeliberativ eDraft

- Do no t quote , cite , copy , o r distribute . Novembe r

19 , 200 2 uni t t o los eit s Clea nUni t status , the nn o emission s increas ewil loccur . Fo r ne w units , however , yo umus t continu et o calculat e post-chang eemission s o nth ebasi s o f aunit' s PTE . 2 . Wil lm

yprojectio no f

projecte dactua lemission s becom e a nenforceabl eemissio nlimitatio na s suggeste di nth e199 8

. NOA? No , w e di dno t adop t suc ha requiremenfeU ! \wi J O " —1.^13Ling emisTSlun j unit e (infl)iH.n n^y.p^nVitdf' ^ Rather,—r£ f yo u arehav e a nexistin g emission s uni t other—tha n-a—EUGGU an dyou r projec t result s i na nincreas e i nannua l emission s tha t exceed s th e baselin e actua l emission s bya significan t amount , an ddiffer s fro myou r projectio no f post-chang e emission s tha t yo u wer e require dt o calculat e an dmaintai n record s of , the nyo u mus t repor t thi s increas e t o you r reviewin g authorit ywithi n6 0 day s afte r th e en do f th e calendar—year . Sinc e modifie dEUSGU s ar e require dt o repor t annuall ythei r post-chang e annua l emission s t o th e reviewin g authorit yannually , an yoccurrenc e of- a significan t increas e wil l b e covere dunde r tha t repor t fo r th e affecte dcalenda r year . Se e sectio nII.D. 6 o f thi s preambl e fo r a mor e detaile ddiscussio no f th e reportin g requirements . 3 . Ho wd o I determin e ho wlon g mypost-chang e emission s 6 6

tr i " d 9IE8-9IG-E0 i *^0 S 99 1 e E O : i O 2 0 2 2 AO WP.16

Interna l an d Deliberativ e Draft
- D o no t quote , cite , copy , o r distribute . Novembe r 19 , 200 2 wil l b e tracke dt o ensur e tha t myprojec t i s no t a majo r modification ? Generally , you r projecte dactua l emission s mus t b e tracke dagains t you r facility' s post-chang e emission s fo r 5 year s followin g completio no f th e change s whethe r yo u ar e a n EUSG Uo r othe r typ e o f existin g emission s unit . W e wil l presum e tha t anyincrease s tha t occu r afte r 5 year s ar e no t associate dwit hth e physica l o r operationa l changes . However , yo u ma yb e require dt o trac k emission s fo r a longe r perio do f tim e unde r th e followin g circumstances . I f yo u ar e a n existin g emission s uni t - f < n^ hr. i

- tha nPI ^ v.n<kc*f\ an d on e o f th e effect s o f you r physica l o r operationa l change(s ) i s t o increas e a unit' s desig ncapacit yo r PTE , yo u mus t trac k you r emission s fo r a perio do f 1 0 year s afte r th e completio n o f th e project . Thi s extende dperio dallow s fo r th e possibilit ytha t yo u coul den d u p usin g th e increase d capacit ymor e tha nyo u projecte dan d suc hus e migh t lea dt o significan t emission s increases . 4 . Wha t ar e th e reportin g an d recordkeepin g requirement s fo r modificatio nprojects ? Reportin g an d recordkeepin g fo r a projec t i s require d whe nthre e criteri a ar e met : 1 ) yo u elec t t o projec t post chang e emission s rathe r tha nus e PTE ; 2 ) ther e i s a 6 7

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Interna l an dDeliberativ e Draft
- D o no t quote , cite , copy , o r distribute . Novembe r 19 , 200 2 2-years—in—5—years2-in-5-year s baselin e method . Finally , today' s rule s provid e th e sam e metho dfo r EUSGU s tha t wil l exis t fo r al l othe r existin g emission s unit s t o project ' post-chang e emission s followin g a physica l o r operationa l chang e t o a unit . I nth e 199 6 proposal , w e propose da rang e o f option s fo r addressin g th e applicabilit y o f change s tha t ar e mad e t o existin g emission s units , includin g th e optio no f extendin g th e " actual—to—futur e • • actual"actual-to-future-actua l test , the navailabl e onl yt o utilities , t o al l sourc e categories . Whil e w e hav e decide d t o leav e th e WEPC O rule s intac t i nmos t respects , w e believ e tha t i t i s reasonabl e an dappropriat e t o establis ha consisten t metho dfo r source s t o us e fo r projectin g th e post-chang e emission s tha t wil l resul t fro ma physica l o r operationa l chang e t o a nexistin g emission s unit . Therefore , unde r today' s ne wrules , th e curren t metho do f basin g th e projectio no nth e 2 year s followin g th e chang e t o a nEUSG Ui s bein g replace dwit hth e metho davailabl e t o al l othe r existin g units , which—roquire s yo u -fe< r projec t a unit' s post-chang e emission s a s th e maximu mannua l rat e tha t th e uni t wil l emi t i nanyon e o f th e 5 calenda r year s followin g th e change . F . Th e "Hybrid " Applicabilit yTes t fo r Modi f icati-en- r 7 4

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Interna l an dDeliberativ e Draft
- D o no t quote , cite , copy , o r distribute . Novembe r 19 , 200 2 Project s Thef t AffectAffectin g Multipl e Type s o f Emission s Unit s 1 . Whe ndoe s th e hybri dapplicabilit ytes t appl yt o you ? Th e hybri dapplicabilit ytes t applie s i f yo u pla na modificatio nprojec t (or serie s o f relate dprojects ) tha t wil l affec t emission s unit s o f tw o o r mor e o f th e followin g types . Existin g emission s unit s

Ne wemission s unit s

• Clea nUnit s 2 . Ho wd o I determin e whethe r myprojec t wil l resul t i na significan t emission s increas e unde r th e hybri dtest ? Fo r th e firs t tw o type s o f emission s unit s liste dabov e tha t ar e affecte dbyth e modificatio nproject , calculat e th e emission s increas e a s we ' hav e discusse dpreviousl yi nthi s preamble . Tha t is , us e th e actual-to-projected-actua l emissionsapplicabilit ytes t fo r existin g unit s an dth e actual-to-potentia l tes t fo r ne wemission s units . Clea nUnit s ar e discusse dfull yi nsectio nV o f thi s preamble . I f a give nprojec t ca nb e constructe dand operate da t a Clea nUni t withou t causin g th e emission s uni t t o los e it s Clea nUni t status , n o emission s increas e s&erlrir <>c b e deem&d—t o occu r a t tha t Clea nUnit . I f a give nprojec t 7 5 •

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Interna l andDeliberativ e Draft
- D o no t quote , cite , copy , o r distribute . Novembe r 19 , 200 2 woul dcaus e th e emission s uni t t o los e it s Clea nUni t status , the nth e increas e i nemission s shoul db e calculate d a s i f th e emission s uni t i s no t a Clea nUnit . Afte r yo u calculat e th e emission s increas e fo r eac h uni t f-haf wil l h ° a f f e-g^^d— bj —H* ^ nv'-l-i- f i •• -•*-

, - 1 '-T I prnje^t ; tota l th e increase s acros s al l th e emission s unit s o f al l types . I f thi s tota l emission s increas e equal s o r exceed s th e leve l define da s significan t fo r th e regulate dNS R pollutan t i nquestion , th e projec t wil l resul t i na significan t emission s increas e fo r tha t pollutant . You'l l fin dth e regulator ylanguag e fo r determinin g whethe r a modificatio nprojec t wil l resul t i na significan t emission s increas e a t ^5-3r§ § 51 . 16 5 (a ) (2 ) (vii ) (D) , #^51.16 6 (a ) (7 ) (vi ) (d ) , an d^52-52.2 1 (a ) (2 ) (vi ) (d ) . I nsectio nII.C. 8 o f thi s preamble , w e indicat e tha t th e baselin e actua l emission s fo r al l unit s tha t ar e no t EUSGU s tha t ar e change db ya modificatio nprojec t mus t b e calculate dbase do nth e sam e consecutiv e 24-mont hperio d withi nth e previou s 1 0 years . Th e sam e principl e applie s unde r th e hybri dtest , bu t i t ca nb e slightl ymor e complicate di f bot hEUSGU s an dnon-EUSGU s ar e involved . I n thi s case , yo u mus t us e th e sam e baselin e perio dfo r al l emission s unit s affecte db yth e modificatio nproject . Thi s 7 6

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