p. 1



# OAR Box 

# 1840 Prepped by Ollie Stewart

Document

Number: 

# 25 ) IV-H-3 1
Docket Number: 

# A-90-3 7

Printed 11/14/20081:25:30PM Sheet 25of 27P. 2

Smith.Pam@epamail.epa.gov , 10:2 3 AM 11/6/200 2 -0500 , A-90-3 7 Docke t Submitta l Pag e 1 o t 1

From : Smith.Pam@epamail.epa.go v Date : Wed , 0 6 No v 200 2 10:23:4 4 -050 0 Subject : A-90-3 7 Docke t Submittal - Another

One ! To : oloughlin.joanne@ecrweb.co m X-Mailer : Lotu s Note s Releas e 5.0.9 aJanuary 7 , 200 2 X-MIMETrack : Serializ e b y Router onEPAHUB12/USEPA/US(Releas e 5.0.9 aIJanuar y 7 , 2002 ) a

t 11/06/200 2 10:23:1 4 AM Than k you , Pa mJ
. Smit

h Regula r Mail : USEPA/OAQPS/ITPID/II G(C339-03 ) RTP,N C 2771 1 919-541-064 1 (Phone ) 919-541-550 9 (Fax ) Fed
. Ex
. Address : U S EPA/OAQP S (C339-03 ) 493 0 Ol dPag e Roa d RTP,N C 2770 9

. —Forwarde db y PamSmith/RTP/USEPA/U S o n11/06/200 2 10:2 2 AM - —

Bil l Harnett To : Amy_L._Farrell@omb.eop.go v 11/06/200 2 10:2 1 cc : Arthur_G._Fraas@omb.eop.gov , Lorraine_D._Hunt@omb.eop.gov , Pa m A M Smith/RTP/USEPA/U S @EPA

Subject : Revise dLanguage(Documen t link : Pam Smith ) A-90-3 7 IV-H-3 1

Amy , Attache dare som e change s that w e hav e made t o th e packag e that nee d revie w b y you . Bil l (Se e attache dfile : footnote.wpd)(Se e attache dfile : debottle.wpd ) footnote.wp d debottle.wp d

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allowing themt o us e projecte d actua l emission s fo r purpose s o f thi s determination . Unde r thi s approach , i n circumstance s wher e ther e i s a reasonabl e possibilit ytha t a projec t tha t i s no t par t
o f a majo r modificatio n ma yresul t i n a significan t increas e o f a regulate d NS R pollutant , befor e beginnin g actua l construction , an owne r o r operato r wh o use s thi s metho d mus t mak e an d recor d a projectio n o f futur e emission s o f tha t pollutan t fro mchange d units. x T o mak e thi s projection , the owne r o r operato r woul d us e th e maximu mannua l rat e a t whic hthe modifie d uni t o r unit s ar e projecte d t o emi t th e pollutan t i n an yo f th e 5 calenda r year s following th e time th e uni t resume s regula r operation s after , th e projec t (or 1 0 year s i f the projec t increase s the unit' s desig n capacit yo r potentia l t o emi t the regulate d NS R pollutant) . Th e owne r o r operato r the n use s thes e projection s t o calculat e whethe r th e projec t wil l resul t i n a significan t emission s increase . I n makin g thi s calculation , the owne r o r operato r woul d exclud e an

yemission s tha t th e uni t coul d hav e accommodate d befor e th e chang e an d tha t ar e unrelate d t o the project . Th e owne r o r operato r woul d als o exclud e emission s resultin g from increase d utilizatio n du e t o demand growt h tha t

'Note tha t we plan , i nthe nea r future , t o issue aNotic e o

f ProposedRulemakin

g tha t wil l addres s the issue o

f "debottlenecking. " I

ntoday' s rulemaking , we d o not inten dt o chang e curren t requirements relatedto "debottlenecking. " Us e of the ter m"change dunit " shouldnot

be interpretedas achange to thos e requirements
. 35P. 4

(xxxv ) Baselin e actua l emission s mean s th e rat e o f emissions , i n ton s pe r year , o f a regulate d NS R pollutant , a s determine d i n accordanc e wit hparagraph s (a)(1)(xxxv)(A ) through (D ) o f thi s section . (A ) Fo r an

yexisting electri c utilit ystea mgeneratin g unit , baselin e actua l emission s mean s th e averag e rate , i n ton s pe r year , a t whic h the uni t actuall yemitte d the pollutan t durin g an yconsecutiv e 24-mont hperio d selecte d b yth e owne r o r operato r withi n th e 5-yea r perio d immediatel yprecedin g whe n th e owne r o r operato r begin s actua l constructio n o f th e projec t a t tha t emission s unit . Th e reviewing authorit yshal l allo wthe us e o f a differen t time perio d upo n a determinatio n tha t i t i s mor e representativ e o f norma l sourc e operation . (_, ) Th e averag e rat e shal l includ e fugitiv e emission s t o the exten t quantifiable , an d emission s associate d wit hstartups , shutdowns , an

d malfunctions . (2. ) Th e averag e rat e shal l b e adjuste d downwar d t o exclud e an ynon-complian t emission s tha t occurre d whil e th e sourc e wa s operating abov e an

yemissio n limitatio n tha t wa s enforceabl e during th e consecutiv e 24-mont hperiod . (3. ) Whe n a projec t involve s physica l change s t o o r change s i n the metho d o f operatio n o f multipl e emission s units , onl yon e consecutiv e 24-mont hperio d ma yb e use d t o determin e th e baselin e actua l emission s fo r the emission s unit s bein g changed . (4. ) Th e averag e rat e shal l no t b e base d o n an yconsecutiv eP. 5

24-mont hperio d fo r whic hther e i s inadequat e informatio n fo r determining annua l emissions , i n ton s pe r year , an d fo r adjustin g thi s amoun t i f require d b yparagrap h(a ) (1 ) (xxxv ) (A ) (2. ) o f thi s section . (B ) Fo r a n existin g emission s uni t (othe r tha n a n electri c utilit ystea

mgeneratin g unit) , baselin e actua l emission s mean s the averag e rate , i n ton s pe r year , a t whic hth e emission s uni t actuall yemitte d th e pollutan t durin g an yconsecutiv e 24-mont h perio d selecte d b

ythe owne r o r operato r withi n the 10-yea r perio d immediatel yprecedin g eithe r th e dat e the owne r o r operato r begin s actua l constructio n o f th e project , o r th e dat e a complet e permi t applicatio n i s receive d b yth e reviewin g authorit yfo r a permi t require d eithe r unde r thi s sectio n o r unde r a pla n approve d byth e Administrator , whicheve r i s earlier , excep t tha t th e 10-yea r perio d shal l no t includ e an yperio d earlie r than Novembe r 15 , 1990 . (_, ) Th e averag e rat e shal l includ e fugitiv e emission s t o the exten t quantifiable , an d emission s associate d wit hstartups , shutdowns , an

d malfunctions. . (2. ) Th e averag e rat e shal l b e adjuste d downwar d t o exclud e an ynon-complian t emission s tha t occurre d whil e the sourc e wa s operating abov e an emissio n limitatio n tha t wa s enforceabl e during the consecutiv e 24-mont hperiod . (3. ) Th e averag e rat e shal l b e adjuste d downwar d t o exclud e an yemission s that , woul d hav e exceede d an emissio n limitatio nP. 6

wit hwhic hthe majo r stationarysourc e mus t currentl ycomply , ha d
suchmajo r stationarysourc e bee n require d t o compl ywit hsuc h limitation s during the consecutiv e 24-mont hperiod . However , i f
an emissio n limitatio n i s par t o f a maximu machievabl e contro l technolog

ystandard tha t th e Administrato r propose d o r promulgate d unde r par t 6 3 o f thi s chapter , th e baselin e actua l emission s nee d onl yb e adjuste d i f the Stat e ha s take n credi t fo r suc hemission s reduction s i n a n attainmen t demonstratio n o r maintenanc e pla n consisten t wit hthe requirement s o f paragrap h (a)(3)(ii)(G ) o f thi s section . (4. ) Whe n a projec t involve s physica l changes—b o o r change s i n the metho d o f operatio n o f multipl e emission s units , onl yon e consecutiv e 24-mont h perio d ma yb e use d t o determin e th e baselin e actua l emission s fo r al l suc h emission s units . (5. ) Th e averag e rat e shal l no t b e base d o n an yconsecutiv e 24-mont hperio d fo r whic hther e i s inadequat e informatio n fo r determining annua l emissions , i n ton s pe r year , an d fo r adjustin g thi s amoun t i f require d b yparagraph s (a ) (1 ) (xxxv ) (B ) (2. ) and (3. )
o f thi s section . (C ) Fo r a ne wemission s unit , the baselin e actua l emission s fo r purpose s o f determining th e emission s increas e tha t wil l resul t fro

m the initia l constructio n an d operatio n o f suc huni t shal l equa l zero ; an d thereafter , fo r al l othe r purposes , shal l equa l the unit' s potentia l t o emit .