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F r o m: Br ian S h r age r / R T P / U SE P A

/ US

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C c: J i m E dd i nge r / R T P / U SEP A

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S ubje c t: Chan g e s in Li q uid Co s t s f o r O MB

Co r t ne y,

Y ou r eque s t ed in f

o r m a t io n on li q uid uni t c o s t s i n c r e a s ing be t ween

p r opo s a l a n d t he f inal d r a f t s en t t o O MB

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T h an k s!

Br ian

B e low i s a b r ie f c o m p a r i s on o f t he T o t al A n nual Co s t s a t p r o po s al and

f i nal f o r t he liquid s ub c a t ego ry:

P r o p o s al:

T he t e s t i n g a nd m on i t o r i ng c o s t s w e r e e s t i m a t ed t o be 27

. 4 m i llion

Con t r ol c o s t s a r e $ 4 34 m i l lion

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T e s t ing and m oni t o r ing i s $20 m i llion

Con t r ol T A C i s $835

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D r i v ing r ea s on s f

o r t he in cr ea s e i n c o s t s:

T he in cr ea s e in t o t a l a n nuali z ed c on t r ol c o s t s i s l a r gel y a t t r ibu t ed

due t o t he a ss u m p t i o n t ha t m o r e l i quid boil e r

s will in s t all f ab r ic

f i l t e r and o x ida t ion c a t al ys t c on t r ol de v i c e s t o m ee t t he m e r c u r y and

C O e m i ss ion li m i t s.

W e r e c ei v ed s e v e r al da t a c o rr e c t ion s t h a t upd a t ed m e rc u ry n u m b e r s f or

liqui d f uel uni t s

. F u r t h e r

, ou r ba s elin e e s t i m a t e s a n d d e f i n i t i on s of

t h e l i quid f u el s u b c a t e g o r y we r e c hange d i n r e s pon s e t o publi c c o m m e n ts

t o r e m o v e i t e m s s u c h a s de i n k ing r e s idual s and o t he r indu s t r ial s l udges

f r o m t he l iquid s ub c a t ego ry s i n c e t he s e i t e m s a r e m o r e c l o s el y r e l a t ed

t o bi o m a ss

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- g r oupin g t he da t a r e c e i v ed

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ba s eline e m i ss ion f a c t o rs f o r m e rc u ry a t liq u id uni t s we r e gen e r a lly

highe r t han t h e MA C T f loo r e m i s s i o n l e v el s

. As a r e s ul t, 42 1 l i quid

uni t s a r e now e x pe c t ed t o in s t all a f a b r i c f il t e r f

o r m e rc u ry c on t r ol

c o m p a r ed wi t h t he one uni t a t p r opo s a l.F o r C O

, we a dju s t ed ba s eline e m i ss ion s ba s ed on r e v i s ed C O da t a w h i ch

adju s t ed how m an y u n i t 's ba s elin e e m i ss ion s e xc eeded t h e MA C T f loor

e m i s s i on v a l ue s

. W e a l s o m odi f ied ou r a ss u m p t i on s f o r wha t w o uld

ne c e ss i t a t e in s t alla t ion o f a C O o x i d a t i on c a t al ys t i n r e s po n s e to

publi c c o m m e n t

t ha t t he A gen cy u n de r e s t i m a t ed t he nu m be r o f uni t s t hat

would r equi r e a c a t al ys t t o m ee t t h e C O l i m i t

. A s a r e s ul t

, 463 uni ts

a r e now e s t i m a t ed t o i n s t all a c a t al ys t c o m pa r ed wi t h t he 226 uni ts

e s t i m a t ed t o i n s t a l l t ha t c o n t r o l a t p r opo s al.

De s pi t e h a v i ng a sm all e r nu m be r o f liquid f uel uni t s s u b je c t to

e m i s s i on li m i t s in t he f in a l r u le a nal ys i s ( 5 0 6 u n i t s c o m pa r ed wi t h 5 88

uni t s a t p r opo s al )

, m o r

e o f t h e r e m ai n ing uni t s a ss ign e d t o t he l iquid

f u e l s u b c a t eg o r

y a r e e x pe c t e d t o in s t all c o n t r o l s

. T he r edu c t ion in t he

nu m be r o f uni t s i s a tt r ibu t ed t o s e v e r al liq u id f ue l u n i t s be c o m ing

c la s s i f i e d a s li m i t ed u s e uni t s

, whi c h a r e no longe r s ubje c t to

e m i s s i on li m i t s in t he f in a l r u le.