### { I n A r c h i v e } A v ena l

- P r

o j # C

- 1080386 : EPA C o mm en ts

S h i r l e y R i v e r

a t o: De r e k F u k uda 08 / 15 / 2008 02 : 12 PM

C c: K a t he ri ne H oag

A r c h i v e : T h i s m e ss age i s be i ng v i e w ed i n an a r

c h i v e.

De r e k,

T han k y ou f

o r c a lli ng ba ck t

oda y ( and on a da y whe r

e y ou a ll ha v e f

l e x sc hedu l e )

. As d i sc u ss ed

, I

m i s t a k en l y had no t

ed t ha t t he 30

- da y c o mm en t pe r i od ended t oda y

, A ugu s t 15 ; howe v e r

, ba s ed on ou r

c on v e rs a t

i on

, I unde rs t

and t ha t y e s t e r da y

, A ug 14

, wa s t

he c l o s i ng da t

e

. T he r e f o r e

, I unde rs t

and and

a ck now l edge t ha t t he c o mm en t

s be l ow m a y be c on s i de r ed b y y ou r agen cy

, and app r e c i a t e t he

c on s i de r a t i on

.

T ha t s a i d

, be l ow a r

e c o mm en t

s on S an J oaqu i n V a ll e y A i r P o ll u t i on Con t r o l D i s t r i c t 's ( " D i s t r i c t " )

Pr e li m i na ry De t

e rm i na t i on o f Co m p li an c e (P D O C ) pe rm i t and P D O C e v a l ua t i on f o r t he Av ena l P owe r

Cen t e r LLC (Av ena l ) p r

opo s ed p r

o j e c t.

1 ) Pr e v en t i on o f S i gn i f

i c an t De t

e r i o r a t i on (PS D ) A pp li c a t

i on Pr o c e ss i ng and P D O C

C r o ss- Re f e r en c e / C r o ss- Che ck

- F o r t

he pu r po s e s o f EPA's r e v i ew o f t

he P D O C e v a l ua t

i on and P D O C

,

a l t hough no t r

equ i r ed a s pa r

t o f ou r PS D pe rm i t app li c a t i on r e v i ew / pe rm i t de v e l op m en t p r

o c e ss

, we a r

e i n

t he p r o c e ss o f i den t

i f y i ng whe t

he r i n f o rm a t i on p r o v i ded b y t

he A pp li c an t t

h r ough t he PS D pe rm i t

app li c a t i on p r o c e ss i s c on s i s t

en t w i t h t he i n f o rm a t i on i n t he D i s t r i c t 's e v a l ua t

i on

. ( No t

e : T he A pp li c an t

p r o v i ded s e c t

i on s f r o m i t s C E C A F C t

ha t i n c l ude s t

he A i r Q ua li t

y and P ub li c Hea l t

h s e c t i on s

, wh i c h

p r e s u m ab l y i s i n f

o rm a t i on t ha t t he D i s t r i c t e v a l ua t

i on a l s o i s ba s ed

. PS D r e v i ew ha s been t

r i gge r ed f o r

N O x

, C O, and PM

. )

W e wou l d li k e t

o en s u r e t ha t, a t a m i n i m u m

, t

ho s e da t a s e t s and a ss u m p t

i on s s ha r ed be t ween t he PS D

and P D O C p r

o c e ss e s t

ha t c on t r i bu t e t o t he de t e rm i na t i on o f t he po t en t i a l

- t o

- e m i t, BA C T, and

a ss u m p t i on s f o r t he a i r qua li t

y ana l ys i s /

m ode li ng a r

e c on s i s t en t. A t t h i s t i m e

, we s i m p l y wou l d li k e t o

m a k e t he D i s t r i c t awa r e t ha t t h i s e v a l ua t

i on i s i n p r

o c e ss

. T o t

he e x t en t t ha t we i den t

i f y i n c on s i s t

en c i e s

du r i ng ou r r

e v i ew

, we w ill add r e ss t he m a s pa r

t o f ou r PS D pe rm i t p r

o c e ss

.

2 ) C O e m i ss i on li m i t

s f r o m t he C TGs

- T he e m i ss i on li m i t s p r opo s ed f o r ea c h c o m bu s t

i on t u r b i ne

gene r a t o r ( C TG )

, Un i t

s C

- 3953

- 10

- 0 and C

- 3953

- 11

- 0

, a r e 4

. 0 pp mv d @ 15% O 2

. W e no t e t he s e a r e

pa r t o f t he P D O C c ond i t

i on s and i s d i sc u ss ed i n t he P D O C A tt

a c h m en t F 's t

op

- down BA C T ana l ys i s f o r

C O. As pa r

t o f a BA C T ana l ys i s

, EPA c on s i de rs a c h i e v ed i n p r a c t i c e e m i ss i on s a s pa r

t o f t he BA C T

e v a l ua t i on

. It i s un c l ea r whe t

he r t he D i s t r i c t ha s i n c l uded t

h i s a s pa r

t o f i t s ana l ys i s

. EPA i s awa r e o f

C TG s a c h i e v i ng C O e m i ss i on s l e ss t han 4

. 0 pp mv d @ 15% O 2

. T he r e f o r e

, p l ea s e p r

o v i de c on f

i rm a t i on

whe t he r t he D i s t r i c t 's e v a l ua t

i on c on s i de r

ed a c h i e v ed i n p r

a c t i c e C O pp m l e v e l s l e ss t han 4

. 0 pp mv d @

15% O 2

. If s o

, p l ea s e p r o v i de r ea s on s wh y a l owe r l e v e l wa s e li m i na t ed f r o m c on s i de r

a t i on

.

O n c e aga i n

, t

han k y ou i n ad v an c e f

o r y ou r c on s i de r

a t i on o f ou r c o mm en t

s

. If y ou ha v e an y que s t i on s

r ega r d i ng ou r c o mm en t

s

, p l ea s e f

ee l f r ee t o c a ll m e o r Mr

. G e r

a r do R i o s

, Ch i e f o f t

he P e rm i t

s Off i c e

, a t

( 415 ) 972

- 3974

.

B e s t r ega r d s,

S h i r l ey

------------------------------------------- S h i r l e y F. R i v e r

a

T: ( 415 ) 972

- 3966 | F: ( 415

) 947

- 3579 | R i v e r

a

. S h i r l e y @ epa

. gov

U

. S

. EPA

, Reg i on 9

, A i r P e rm i t s Off i c e (A I R

- 3

) | 75 Haw

t ho r ne S t., S an F r

an c i sc o

, C A 94105