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# OAR Box 1778
Prepped by Ollie Stewart



### Document

Number: 

# 254 ) IV-B- 1
Docket Number: 

# A-90-0 6

Printed 10/28/20089:51:03 AM

Sheet 254 of 276

# ft-^o-CC, ^V-B-J^

. P. 2

* 

# US E

** - ** < PBO ' ^ ^ UNITE D STATE S ENVIRONMENTA L PROTECTIO N AGENC Y WASHINGTON

, D.C

. 2046 0 

### JU N I 2 I99 &

MEMORANDU

M SUBJECT :
FROM : 

### l^AIRDOCKE T OFFIC E O F AN D RADIATIO N

Concurrenc e o

n Correction s Mad e t o the WEPC O Fina l Rul e Prio r t o Publication i n the Federa l Registe r Willia m G . Rosenber g Assistan t Administrato r fo r Ai r an

d Radiation (ANR-443 ) 

### TO : The Administrato r

I t ha s com

e t o our attentio

n tha t ther e ar e error s i n th e regulation s in the WEPCO fina l rul e tha t you signed o n Ma y 20 , 1992 . The error s i n the rulemakin g packag e ar e mino r i n natur e an d involv

e issue s o f consistency an d clarification . The y do no t chang e the intende

d scope o f the rul e a s signed . The followin g i s a description o f the individua l correction s made : Sectio n 415.c ) o f th e Clean Ai r Ac t Congres s created a limite d exemptio

n fro m ne w sourc e performanc e standard s (NSPS ) an d prevention o f significan t deterioration (PSD ) for the reactivation o f a n idl e coal-fired utilit y uni t whic hmeet s certai n condition s [see 'Clea n Ai r Ac t § 415(c)] . Thi s exemptio n wa s apparentl y

tailored t o allo

w a specifi c sourc e t o star t u p agai n afte r a prolonged shu t dow n withou t facin

g an y ne w sourc e revie

w constraints . I n the WEPC O rulemaking , the Environmenta l Protectio n Agency

(EPA ) propose d changin g it s regulation s t o reflec t thi s ne w exemption . However , whil e the preambl e accuratel y describe s the exclusion a s applyin g t o NSP S an

d PSD , the regulator y languag e wa s inadvertentl y added t o the nonattainmen t ne w sourc e revie

w (NSR ) regulation s a s well . Thi s erro r wa s inadvertentl y mad e in the proposa l an d carried int o the fina l regulator y packag e tha t you signed . T o rectif y

the problem , we have deleted th e exemption languag e a s inappropriatel y applied t o the nonattainmen t NS R regulation s fro

m the fina l regulations , a s show n in the attached pages . W

e als o have adde

d the followin

g sentenc e t o the en d o f the firs t paragrap

ho f pag e 8 7 o f the preambl e t o the fina l rule : "Pleas e not e tha t languag e inadvertentl y included i n th e proposed regulation s whic hpurported t o exten d the exemptio

n in § 415(c ) t o nonattainmen t area s i s inconsisten t wit hth e statut e an d ha s been deleted fro

m the fina l rules. "P. 3

Representativ

e Actua l Annua l Emission s The EP A revised it s methodolog y for calculatin

g emissio

n increase s a t electri c utilit y stea m generatin

g source s b

y comparin

g actua l emission s befor e an d afte r change s a t such source s (i.e. , the "representativ e actua l annua l emissions " methodology) . The WEPCO rul e incorporate s thi s methodolog y int o the ne w sourc e revie

w regulation s for the purpos e o f determinin g i f a chang e woul d be considered major . Thi s concep t wa s correctl y

discussed in grea t detai l i n the preamble s t o bot hthe proposed an

d fina l rule s an

d i s reflected i n the fina l rule . I n the rule , however , redundan t languag e applyin g a "representativ

e actua l annua l emissions " tes t als o appear s a t 4 0 CR F 51.166(b)(2)(iii)(i) . The inclusio n o f thi s paragrap hin the rul e wa s mistakenl y carrie d ove r fro

m the proposal . The preamble s t o bot hthe proposa l an d fina l rule s neithe r discus s no r refe r t o thi s paragrap ha s bein

g par t o f the rulemaking . T o correc t thi s error , w e hav e deleted the paragrap hfro m the regulations . It s remova l doe s no t i n an y wa y chang e the effec t o r scope o f the fina l rul e a s the us e o f the "representativ e actua l annua l emissions " metho d i s als o include

d i n the appropriat e plac e in bot hth e proposed an

d fina l regulations . Othe r Mino r Clarification s an d Correction s I n addition , certai n section s o f the rul e incorrectl y referenc e the "Administrator " o r "reviewin g authority. " Thes e section s hav

e been corrected t o referenc e the appropriat e authority . Othe r mino r correction s t o the rulemaking , reflectin g typographica l o

r forma t change s consisten t wit hthe requirement s o f th e Federa l Registe r office , hav e als o been made . Al l o f the abov

e correction s hav

e been reviewed b

y the Offic e o f Genera l Counsel . A s al l the discussed correction s ar e clarifyin

g in natur e an

d i n n o wa y alte r the scope o f the rulemaking , the

y hav e no t been subjec t t o interagenc y review . A cop y o f thi s memorandu

m wil l be placed in the rulemakin g docket . I reques t tha t you concu r wit hthe attached corrected part s o f the preambl e an

d fina l regulation s addressin g the firs t tw

o item s discussed abov

e mad e t o the WEPCO rul e signe d o n Ma y 20 , 1992 . Attachment s

CONCUR :
DATE : 

# LdSlP. 4

y

-87 -

Afte r revie

w o f th e publi c comment s an d furthe r analysi s o f th e subjec t provision , EP A ha s decide d t o promulgat e th e proposed rule s implementin g th e CC T an

d very clean uni t exemptio n create d b

y the 199 0 Amendments . Th e EP A view s thi s actio

n a s merel y

incorporatin

g int o it s existin g regulator

y framewor k statutor y exemption s tha t wer e immediatel y

effectiv

e upo n passag e o f th e 199 0 Amendments . 

### P.r?a£ e r\*it ^KA T U^O^ C {(.a^o-hrMy i^du^Ji ' ^ ' rtvJL 

### . Ocopafccl rule * tJii&

hp^/por W

+ * J^te-j-

W fh&, d^Ci^fh^ / hs£c> ^ -4'Srt ) ±t

<\Qn<tfu.*<"€*J- areas ln*s been

F . Calculation o f NSP S Baselin e V \ « T Background . ,-_—----•' A s discusse d i n th e proposal , "an y physica l o r operationa l chang e t o an existin g facilit y

whic hresult s i n
a n increas e i n the emission rat e t o th e atmospher e o f an y pollutan t t o whic ha standar d applies " i s a modificatio n fo r NSP S applicabilit y purpose s [see 4 0 CF R § 60.14(a)] . Th e NSP S regulation s implementin g thi s genera l definitio n focu s
o n increase s i n hourl y emissions , expressed i n kilogram s o f pollutan t discharged pe r hour . T o determin e i f a n increas e in hourl y

emission s ha s occurre d a t a unit , a pre-chang e baseline mus t b

e established . Unde r curren t regulations , the emission s rat e befor e an d afte r a physica l o r operationa l chang e i s evaluate d a t eac huni t b y comparing the curren t hourl y potentia l emission s a t maximu m operating capacit y

t o hourl y

emission s a t maximu m capacit y

afte r th e

. 

# 0P. 5

A 

### (i ) -th e -Sif l fo r th e Stat e i nwhic hth e projec t i s located , an d (ii ) othe r requirement s necessar y t o attai nan d maintai nth e nationa l ambien t ai r qualit y standard * durin g th e projec t and-afte r i t i s terminated .
(10 ) Th e reactivatio no f a ver y clea ncoa l fire d^ L alectari c utilit y

ctea a generatin g unit. —

**** *


### (xii )
(D ) Fo r an y

emission s uni t (othe r tha na nelectri c utilit y stea m generatin g uni t specifie di nparagrap h i^A^l ) (x ^ ) (E ) o f thi s -su&Section ) -fehat f ha s no t begu nnorma l operation s o n©^particula r date, , actua l emission s shal l

Lfrtode i equa l th e potentialetoeemi t o f th e uni t o ntha t date . (E ) Fo r a nelectri c utilit y stea m generatin g uni t (othe r tha na ne w

uni t o r th e replacemen t o f a n existin g unitJ^actua l emission s o f th e uni t followin g th e physica l o r operationa l chang e shal l equa l th e representativ e actua l annua l emission s o f th e unit , \ V t P*f?YJ'?f's-.$? e 

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# ~aP. 6

-114 - (xxv ) (^Reactivatio

n o f a ver

y clea n coal-ftire

d electri c utilit y stea m generatin

g unit O mean s an

y physica l chang e o r chang e Ni

n th e method o f operatio n associate d wit hth e
commencemen t o f commercia l operation s by/ a coal-fire d utilit y unit ; afte r a perio d o f discontinue d operation wher e th e unit :



### Al (jl) ha s no t bee n i n operatio n fo r th e 2-yea r perio d prio r t o the enactmen t o f the Clea n Ai r Ac t 199 0 Amendments , an

d the\emis/ion s fro m suc huni t continu e t o be carrie d i n th e permittin g authority' s emission s inventor

y a t th e time'of c enactment ;
(ia ) wa s equipped/prio r t o shut-dow n wit ha continuou s syste m o f emission s contro l thVt achieve s a remova l efficiency

toy sulfur dioxid e of\n o les s tha n 8 5 percen t an

d A remova l efficiency r*o r particulate s o f n o les s than p 8 percent ;
(ill ) /s equipped wit hlow-NO xburner s prdo r t o th e time/o f commencemen t o f operation s followin g reactivation ; an

d

(iv ) i s otherwis e i n complianc e wit hth e requirement s
o f the Clean Ai r Act .P.7
.

-117 - ( / ) («£

- whe n th e reviewin g authorit y

ha s reaso n —* ~ *_»
. t o believ

e tha t the pollution contro l projec t woul d resul t i n a significan t ne t increas e i n representativ

e actua l annua l emission s o f an y criteri a pollutan t ove r level s use d fo r tha t
sourc e i n the mos t recen t ai r qualit y impac t analysi s i n th e are a conducte d fo r th e purpos e o f titl e I , i f any , an d
( "2- \ "{&) *_. n e reviewing authorit y determine s tha t the increas e wil l caus e o r contribut e t o a violatio

n o f an y nationa l ambien t ai r qualit y standar d o r PS D increment , o r visibilit y limitation .

£l' ^ < X#' / " i e installation , operation , cessation , o r remova l o f a temporar y clea n coa l technolog

yP. 8

-118 - 

### demonstratio nproject , provide d tha t th e projec t complie s with :

th e Stat e implementatio npla nfo r th e Stat e i nwhic hth e projec t i s located ; an d {.}.'^^f othe r requirement s necessar y t o attai n and maintai nth e nationa l ambien t ai r qualit y standard s durin g th e projec t and afte r i t i s terminated .

O ) (- ^ Tn e 

### installatio no r operatio no f a permanen t clea ncoa l technolog y demonstratio nprojec t tha t constitute s repowering , provide d tha t th e projec t doe s no t resul t i na nincreas e i nth e potentia l to-5emi t o f an

y regulate d pollutan t emitte d b y th e unit . Thi s exemptio nshal l appl y o na pollutant by-pollutan t basis .
•9' 

### (jC) [1), Th e reactivatio no f a very clea ncoal-fire d electri c utilit y

stea m generatin g unit .

(21 ) 

# l £P. 9



### -139 - (1 ) th e Stat e implementatio npla nfo r th e Stat e i n whic hthe projec t i s located , an d (2) othe r requirement s necessar y t o attai nan

d maintai nth e nationa l ambien t ai r qualit y standard s durin

g th e projec t an

d afte r i t i s terminated . (j ) Th e reactivation^f__^_-^ery~^eiea n coal-fire d eJ^Gfcrio'utilit

y stea m generatin

g unit .

**** * 

### (13 ) * * *
(iv ) Fo r an

y emission s uni t (other thanan electri c utilit y stea m generatin

g uni t specified i n paragrap h
•r .-" V \
. . \*>\yidr\ 

### \A I * v ( v 

### * - o f 

### *£*- s 

### subsection ) --tehe* ^ ha s no t begu

nnorma l operation s o

nJBUparticula r date , actua l emission s shal l equa l th e potentia l t o emi t o f th e uni t o n tha t date . (v ) Fo r a

n electri c utilit y

stea m generating uni t (other than a ne

w uni t o r th e replacemen t o f an existin g unit) * actua l emission s o f th e uni t following th e physica l o r operationa l chang e shal l equa l th e representative actua l annua l emission s o f th e unit . provide d m 

### the # 

### sourc e # 

### owne r # 

### o r m 

### operator # 

### maintain sP.1 0

-143 - (23 ) ^Reactivation o f a ver y clea n coal-fired electr i utility , stea

m generatin

g unit^mean s an

y physica l chang e o r chang e i n th e method o f operation associate d wit hth e
commencemen t o f commercia l operation s b y a coa l utilit y uni t afte r a period o f discontinue d operatio n wher e th e unit : - Z _•— - C \

L-fire d

[ th e unit :
(i ) ha s no t bee n i n operation fo r th e 2-yea r perio d prio r t o the enactmen t o f the Clea n Ai r Ac t Amendment s
o f 1990 , an

d the emission s fref m suc huni t continu e t o b e carried i n the permittin g authority' s emission s inventor

y a t the tim

e of/enactment ;

(ii ) wa s equipped prio r t o shut-dow n wit ha continuou s syste m o f emission s contro l tha t achieve s a remova l efficiency

for sulfur dioxid e o f n o les s tha n 8 5 • percen t an

d a .remova l efficiency , for particulate s o f n o les s than Sly percent ;
(iii ) if equipped wit hlow-NO xburner s prio r t o th e tim e o f commencemen t o f operation s followin g reactivation ; an

d

(iv ) i s otherwis e i n complianc e wit hth e requirement s
o f th e Clean Ai r Act .