### R e s pon s e s t o Q ue s t i on s on EPA P r o c e ss f o r P hoen i x C e m ent

C o ll een M c K aughan t o: M a r t z

, V e r le 12 / 14 / 2012 03 : 16 PM

C c: G r ego r

y N udd

, T ho m a s W ebb

, C ha r l o tt e Wi t he y

, E ugene C hen

, S hahee r ah K e lly

Fr o m: C o ll een M c K aughan /R 9 /U SEPA /US

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, T ho m a s W ebb /R 9 /U SEPA /U S @ EPA

, C ha r l o tt e

W i t he y /R 9 /U SEPA /U S @ EPA

, E ugene C hen /R 9 /U SEPA /U S @ EPA

, S hahee r ah

K e ll y /R 9 /U SEPA /U S @ EPA

H i

, V e r l e,

Y ou had a sk ed u s s o m e que s t i on s i n an e m a il da t ed 11 / 28 / 12

. I ha v e h i gh li gh t ed t ho s e que s t i on s and

p r o v i ded t he r e s pon s e s be l o w.



### ( 1 ) i f t h e qu e s t i o n s w e r e a sk e d pu r s u a n t to a p ar t ic u l ar s t a t u te o r r e g u l a t i on ; ( 2 ) w h a t t h e E PA i n te nds

to d o wi t h o u r a n sw e rs ; a nd ( 3 ) i f t h e E PA is g ett i n g r e a d y to p r o p o s e t h a t t h e C l ar k d a l e f a cili t y is a

B A RT

- e li g i b l e s o u r ce

.

1 ) W e a r e a sk i ng t he s e que s t i on s i n t he c on t e x t o f ou r a c t i on on t he 2018 v i s i b ili t y goa l s f o r t he A r i z ona

R eg i ona l H a z e p r og r a m

. A s w e s t a t e i n S e c t i on V III

. B

. o f t he p r opo s ed a c t i on

, be c au s e A r i z ona ’ s 2018

v i s i b ili t y goa l s p r o v i de f o r a r a t e o f i m p r o v e m en t i n v i s i b ili t y s l o w e r t han t he r a t e needed t o s ho w

a tt a i n m en t o f na t u r a l c ond i t i on s b y 2064

, t he R eg i ona l H a z e R u l e r equ i r e s t he s t a t e ( o r EPA i n t he c a s e

o f a F ede r a l p l an ) t o de m on s t r a t e w h y i t s R ea s onab l e P r og r e ss G oa l s a r e r ea s onab l e and w h y a r a t e o f

p r og r e ss l ead i ng t o a tt a i n m en t o f na t u r a l v i s i b ili t y c ond i t i on s b y 2064 i s no t r ea s onab l e

. [ S ee 40 C F R

51

. 308 ( d )( 1 )( ii ) .]

2 ) G i v en t he r a t e a t w h i c h v i s i b ili t y

- i m pa i r i ng po ll u t an t s a r e e m i tt ed f r o m t he P hoen i x C e m en t p l an t, and

i t ' s p r o x i m i t y t o C l a ss I a r ea s

, EPA i s t r y i ng t o de t e rm i ne i f t he r e a r e r ea s onab l y c o s t

- e ff e c t i v e c on t r o l s

t ha t c an be i n s t a ll ed a t t he f a c ili t y

. Y ou r i n f o rm a t i on w ill he l p u s t o m a k e an a cc u r a t e e s t i m a t e o f t he

c o s t s and bene f i t s o f add i t i ona l c on t r o l s a t P hoen i x C e m en t.

3 ) W e a r e no t p l ann i ng t o p r opo s e t ha t t he C l a r k da l e f a c iil t y i s a BA R T

- e li g i b l e s ou r c e.

I hope t h i s i n f o rm a t i on i s he l p f u l

. I a m go i ng t o be ou t o f t he o ff i c e o v e r t he ho li da ys

. I f y ou need

i n f o rm a t i on du r i ng t ha t t i m e

, p l ea s e c on t a c t G r eg N udd a t 415

- 947

- 4107 ; nudd

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C o ll een W

. M c K aughan

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, A i r D i v i s i on

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- 0118