1 Grcenridg e Lan e ff 2 

### Lincoln , M

A 78 1 259-021 9 Februar y 20,200 4 Ms . Kare n Rega s Massachusett

s Departmen

t o f Environmenta

l Regulatio n BWP/Complianc

e Division 8 t h

### Floo

r 1 Winte r Stree t Boston , M A 0210 8 Subject: Comment

s o n th e Propose d Amendment

s t o Massachusett

s DE P Regulations 7.0 0 Presente d belo w ar e comment

s o n th e propose d Amendment

s t o Regulation

s 7.00 . Than

k yo u fo r you r consideratio

n o f thes e issues . 1 . 702(2)(f

l - Exemption

s for Exclusion s tha t Contraven e a n Existin g Pla n Approval : 7.02(2)(f

) include s ne w languag e tha t specifie s tha t action s tha t woul dcontraven

e existin g "monitoring , recordkeeping , testin

g o r reportin g requirement

s requir e aPla n Approval" . Thi s languag

e is strongl y opposed , a s i t i s likel y t o effectivel

y eliminat e an y opportunit

y t o streamlin

e o r improv e existin g monitoring , testing , recordkeepin g an dreportin g requirements , whic

h i n som e instance s i s antiquated

, overlappin

g o r duplicative . It i s requeste

d tha t thi s languag

e b e revise d t o allo w to r consolidation, streamlining , improvement

, adjustmen

t o f monitoring,

- recordkeeping, testin g an dreportin g provisions . Suggeste d alternativ

e languag e i s "existin g monitoring , testing , recordkeepin g an dreportin g requirement

s canno t b e contravene

d excep t fo r purpose s o f consolidation, streamlining , integration , o

r replacemen

t b y a n equivalen

t se t o f conditions" . Man y existitt g 7.0 2 permit s wer e issue d wel l befor e ne w monitorin g regulation s an d 

### technique s wer e developed. Fo

r example , a t large r site s mos t opacit y monitor s ar e no w connecte d t o computers , whic

h directl y recor dan d aggregat e measuremen

t data , makin g char t recorder s redundan

t an d imcccsary . Howeve

r man y permit s requir e opacit y an dothe r CEM S dat at o b e logge do n stri p char t recorders , Similarly , ther

e is a n increasin g tren dtowar d performin g recordkeepin

g electronicall

y (i.e . i n acomputer) , rathe

r tha n in ahardcop

y logbook . Replacemen

t o f stri p chart s an dlogbook s b y thei r electroni c counterpart

s shoul d no t requir e apermi t revision . Mor e importantl

y to myself

, mos t Air Plan s permit s requir e tha t CEM S operatio n compl y wit h 4 0 CF R6 0 monitorin

g provisions , whos

e requirement

s overla p an din som e case s conflict wit h th e newe r an d mor e full y elaborate

d 4 0 CF R7 5 (Aci dRain/NO x Budget ) regulations . Source

s whic h hav e a n Ai r Plan s permi t an dar c als o i n th e AcidRai n o r NO x Budge t Program , the n ar e subjec t t o tw o set s o f monitorin g regulations , whic

h i s bot h complicate dan d confusin g Ihav e bee n tryin g t o wor k wit h bot h EP A an dDE P t o largel y substitut e th e newe r 4 0 CF R7 5 procedure

s an dspecification

s fo r th e olde r Par t 6 0

1

6130-652 18L dos s I D frO 0 2counterparts . However , an y suc h streamlinin g effort s woul db e effectivel y undermined , i f i t shoul d requir e aPlans Approva

l t o effec t suc h aconsolidatio n o f

monitorin g requirements . 2 . 7.02(4Va)(2 ) Limite dPla n Approva

l Applicability fo r

Fue l Utilizatio n Facilities : thi s applicabilit

y provisio n indicate s tha

t afue l utilizatio n uni t

i s subject t o LPA i f the "potentia

l emissio n increase fro mthe said emissio n uni t du e t o construction , substantia l re-construction , etc . i s < 1 ton/year" . Base d o n thi s language , i t

i s unclea r i f potentia l emission s ar

e evaluate d agains t thi s 1 to n threshol d o

n a n individual pollutant

basis , o r i f th e potentia l emission s fo r al l air contaminant

s ar e adde d fo r compariso

n t o thi s threshold . I t

i s assume

d tha t thi s evaluation i s to b

e performe d separatel

y fo r eac h air contaminant , consisten

t wit h th e provision s o f

7.02(4)(a)(l) , I f

so , i t i s suggeste

d tha t th e phras e " asingle ai r

contaminan

t fromthe " b

e inserted after

"potentia l emissions " an

d befor e "sai d emission unit " i n tin s provision . 3 . 31 0 CM

R7 06(l)(a)

- A . Th e standard

s establishe

d i n 31 0 CM

R7.Q6(J.)(a

) shoul d b e expresse

d i n % opacit

y instea d o f Ringlcma

n scal e increments , a

s thi s i s th e manne r i n whic h thi s provisio n i s applie d i n practic e (i.e . replac e No . 1 o n th e Char t wit h 20 % opacit

y , an d No . 2 o n th e Char t with 40 % opacity) . B . I t i s fuitlic i piopwo d dial th e standard

s i n 31 0 CMR7.06(l)(a ) b e expresse

d a s > 20 % an d > 40% , rathe

r > 20 % an

d £ 40% , consisten

t with the manne

r i n whic h al l othe

r permit limit s ar c established . Wit h al l othe r permit limits , includin g 7.06(a)(2) , a n exces s emissio

n only occur

s i f th e limi t i s exceeded, no t

whe n i t i s simpl y reached . 4 . Opacit

y Rul e 7.06( 1 )(c) : whil e i n genera l the ne w alternativ e Opacit

y 7.06(l)(c ) provision s ar e supported , certai n revision s ar e requeste d A . Th e absolut e ceilin g o f

27 % should b

e revised t o allo w brie f

period s n f

mor e elevate d emission s durin g startup , shutdown , an d burne r trip-ou t whe n suc h spikin g canno

t b e entirely avoided . Durin g period s o f highl y transien

t combustion , suc

h a s ma y exist a t startup , shutdow

n an d burne r trips , i t ma y no t b e feasibl e to kee

p fue l an d ai r wel l mixe

d throughou

t th e combustion zone , s

o tha t shor t opacit y (an d CO ) spike s ca

n occu r eve n i f prope r operating practice s ar

e followed . O

n thi s basis , most

emission regulations , includin g NO x RAC T an

d NSPS , provid

e exemption s fo r

startu p an d shutdown periods , Whil e th e alternativ e 27 % opacit

y limi t doe s provide som

e relie f fo r suc h transien t periods , i t

i s no t sufficien t

unde r al l startup , shutdown , burne r tri p conditions , suc

h a s col dstarts , post-outag

e start s whe n significan t

servicin g ma

y hav e bee n done , etc . Suc

h cxcccdances o f

thi s 27 % ceilin g shoul

d b e relativel y infrequent

an d o f shor t duration i f

a boile r i s properly operated , but

the y appea r to b e unavoidable . An di t

doe s no t see m appropriat e t o promulgat

e arule tha

t canno t b e satisfie d a

t al l times , particularl y i n th e contex t o f Titl e V certificatio n requirements . I t i s suggeste

d the n tha t minor exception s t o thi s 27 % ceilin g b e allowed , i f

justifie di n th e Good Operating Practice s pla n Suc h a n exception migh

t consis t of : • Durin g startup , shutdown , an d burne r tri p hour s allo w u p to 2 o r 3 6-minut

e block s > 27% , s o lon g a s th e hourly averag

e = 27% ; o

r • Durin g startup , shutdown , an d burne r tri p hour s allo w u p t o 2 o r 3 6-minut

e block period s u p t o 40 % or 50 % opacity . 

### 2 GT.20-6Q2 IBL efOSJI O frD 0 2Suc h exception s wil l hav

e negligibl e effec t

on overall emissions , bu

t should allo w a source t o remai

n i n complianc e a

t al l times , i f

operating practice s ar

e properl y designe d an d implemented . B . Th e developmen

t o f aGood Operating Practice s Pla n b y a n independen

t exper t i n conformanc e with th

e propose d 7.06( 1 )(c)2 . provision s shoul d onl y b e require d fo r sources requesting : (1 ) cithe r a n alternativ e limi t

> 27% ; or

(2 ) us e o f th e 27 % limi t

fo r atypica l specia l event s othe r tha n startup , shutdown , burne r trips , fue l swapping , an

d loa d changes . Whil e th e Goo d Operating Practice s Pla n i s good idea , i t

i s tim e consumin

g an d expensiv e t o develop , an d i s no t require d fo r

an y othe r regulatio n (RACT , Ai r Plans , etc. ) tha t establishe s fixe dlimits . Thi s Goo d Operating Practice s Pla n seems , t o som

e extent , to b e avestige o f

th e olde r version s o f

thi s rule , i n whic h eithe

r n o limi t wa s specified , o

r th e limi t wa s variabl e (i.e . u

p t o 27 % fo r

specifie d specia

l conditions , wit h th

e exac t value dependin

g on th e recommendatio

n i n the goo d Operatin

g Practice s Plan) . I t i s propose

d tha t th e 7.06(c)(2 ) provisio n b

e revise d to : • Requir

e aGoo d Operating Practice s Pla n only , i f a n opacit y emissio n limi t i n exces s o f 27 % i s bein g requeste

d fo r aparticula

r typ e o f specia l condition . Th

e Pla n should provide justificatio n fo r

thi s exception limit ; • Requir

e tha t th e plan t SO P includ e procedure s fo r

th e maintenanc

e o f prope r opacit y durin g startup , shutdown , soo t blows , a s wel l a s norma l operatin g conditions , bu

t no t requir e these procedure s t o b

e eithe r develope d b y a n outsid e exper t o r submitted t

o MADE P fo r

approval . At aminimumprovisio n 7.06(c)2(f ) should b e eliminated , a

s i t i s n o longe r relevan t C , Al l boile

r unit s should b

e allowe dth

e optio n o f

electing t o satisf

y th e 7.06 ( 1 )(c ) opacit

y provision s i n lie u o f

7.06( 1 )(a) an

d (b) , no t jus t boiler s < 50

0 MMBtu/hr

ma t ar e i n th e Operating Permit

progra m 5 . 7.19(l3)(a) : I t

i s suggeste

d tha t reference s t o 7.2

7 i n thi s Sectio

n b e change d t o 7.27/7.2S , a

s th e 7.2 7 Progra mha s effectivel y expired . 6 . 7.19(13)(c) : Th

e lette r "M " i s missin g i n th

e 31 0 CMR7.19(13)(c ) reference i n thi s Sectio n 7 . 7.54 : New Larg e Combustion Emissio n Tjni t Rule A . 7.54(2)(a

) an d (b) : Th e definitio n o f

a"Larg e Combustio

n Emissio n Uni t (LCEU) " should clarif

y whethe r aCombine

d Cycl e turbine configuratio n fall s withi n th e definitio n o f "indirec t hea t exchanger" . Th

e WRS G portio n o f

acombine

d cycl e uni t

coul db e considere d ahea t exchange r heate d by th e products o f

combustio

n o f the turbine , thereb

y possibl y draggin g th

e entir e combined cycl e uni t

int o bein g classifie d a

s a n LCEU . It doe s no t see mappropriat

e tha t asimple cj'cte combustio n turbine woul db

e exemp t from thi s rule , bu

t no t acombined cycl e uni t

du e t o th e HRSG . I f DE P wishe s t

o restric t the applicabilit

y o f thi s Sectio

n t o genuin e hea t exchange r units , i t woul db e helpfu l to explicitl y exclud e engines (turbine s i n an

y arrangement

, includin g those equippe

d with duct

burners , a

s wel l a s reciprocating engines ) a s i s don e i n othe r section s o f

th e ai r regulations . 

### 3

6I20-BS2 T

BL

### I t is furthe r suggeste d tha t this exclusio

n exten d t o combine d cycl e unit s wit h fire dduc

t burner s t o avoi dth e situatio n i n whic h th e onl y duc t burne r portio n acombine

d cycl e uni t i s subjec t t o th e LCE U rale. B . 7.54{2)(n) : I t

i s suggeste

d that , th e exampl e se t provide d i n th e definition o f

"Pollutio n Contro l Project " b

e expande d t o includ e Lo w NO x Burner s (LNB ) i n orde

r t o clarif y tha t pollution contro

l project s ar e no t confine d t o alte r treatmen t equipment

, bu t als o exten d t o features tha

t ma y b e par t of th e combustio

n uni t inheren t design , suc h a s LNB . C . 7.54{2)(j) : Th

e definition o f

actua l emission s shoul d allo w all LCEU

s t o determin

e postmodification actua

l emission s from"representativ

e actua l annua l emissions " occurrin

g afte r implementatio

n o f di e change . This methodolog

y shoul d no t b e restricte d t n dectnr . utilit y stea mgeneratin

g units . Ther

e woul dsee mt o b e n o reaso n t o discriminat

e agains t th e fe w LCEU s in th e stat e tha t ar c no t electri c utilit y unit s b y requirin g onl y the mt o us e potentia l emission s t o represent , post-modificatio

n actua l emissions . LCE

U boiler s ar e simila r enoug h t o electri c utilit y stea mgeneratin

g unit s t o b e place d int o th e sam e categor y fo r th e purpos e o f thi s determination . Th

e metho d use d t o calculat e postmodificatio

n actua l emission s ca n significantl

y affect projec t applicabilit

y statu s (i.e . whethe r aprojec t i s subjec t t o 7.54) . Than k yo u fo r di e opportunit y t o provid e thes e comments . 

### Sincerely : Bo b Machave

r 78 1 259-021 9

4

S *e l BI20-652 IBL olDS t t o frO 0 2 qe j