----- F o r wa r ded b y B r i an S h r a g e r / R T P / U S E PA

/ U S on 02 / 18 / 2011 03 : 03 PM

-----

F r o m: Bry an H u bbell / R T P / U S EPA / US

T o: c ou r t ne y _higg i n s @ o m b

. eop

. gov

C c: Am y La ms on / R T P / U S EP A / U S @ EP A

, Ron Ev an s / R T P / U S EP A / U S @ E P A

, T om

W a l t o n / R T P / U S E PA

/ U S @ E PA

, K i rk B a k e r

/ R T P / U S EP A

/ U S @ E P A

, I nes

P agan / R T P / U S EPA

/ U S @ EP A

, B r i a n S h r ag e r / R T P / U S E PA

/ U S @ EPA

Da t e: 02 / 16 / 2011 04 : 45 PM

S ubje c t: F w : A d di t ional I n t e r a gen cy Co mm en t s o n B oi l e r s R IA

Cou r t ne y,

T h an k y ou f o r p r o v iding addi t io n al w r i t t en c o m m e n t s on t h e b o ile r R I A.

W e ha v e r e v iewe d t he bene f i t s a n d a i r qu a li t y c o mm en t s

, and we a re

qui ck l y wo rk ing t o up d a t e t he R I A t o i n c o r p o r a t e t he s e edi t s

. W e will

be a cc ep t ing t h e l i ne edi t s in who l e wi t h t he t h r e e m ino r e xc ep t ions

bel o w

. I n add i t i o n

, we a r e adding t he m a p s d i s c u ss ed y e s t e r d a y and

c a sc ading all o f t he ap p r o p r ia t e c h a nge s t o t he C I S W I R I A

. T h e en t i re

ben e f i t s g r oup will be in a m a n da t o r y t r aining al l d a y

t o m o rr ow

, and as

s u c h

, we woul d l o v e t o f i n d o u t i f t he r e a r e an y r e m aining be n e f i ts

i ss ue s t o d a y

, i f p o s s i b le.

1

. W e ha v e r

e v i s e d t he di ff e r en t ial t o x i c i t y s t a t e m en t t h r ough o u t t he

do c u m en t t o be c o n s i s t en t wi t h t he c on c lu s ion o f t h e PM I S A

. " T he se

m odel s a ss u m e t ha t all f i ne p a r t i c l e s

, r ega r dl e s s o f t hei r c he m i c al

c o m po s i t ion

, a r e e q uall y po t en t in c au s ing p r e m a t u r e m o r t a l i t y be c au se

t he s c i e n t i f i c e v iden c e i s no t y e t s u ff i c ien t t o all o w d i f f e r en t ia t ion

o f e f f e c t e s t i m a t e s b y pa r t i c le t y pe ( U

. S

. E PA

, 20 0 9 c)"

2

. W e ha v e dele t ed r e f

e r e n c e s t o " r e s o u r c e l i m i t a t ion s "

, b u t we ha ve

c la r i f ied t ha t t he t i m e l i m i t a t ion s a r e due t o t he c ou r t

- o r de r ed

sc hedule f o r t he s e r ule s t h r oughou t t h e d o c u m e n t.

3

. W e ha v e r

e v i s e d t he H A P lan g uage on a cr olein t o a dd r e ss O M B's

c on c e r n.

" Re s ul t s f r o m t he 200 2 N A T A s ug g e s t t ha t a cr ole i n i s t he p r i m a ry d r i v er

f o r n on c an c e r r e s p i r a t o r y r i sk

. ( f oo t no t e 1 ) La r g e r ed u c t io n s in H AP

e m i ss ion s m a y no t ne c e ss a r il y t r an s la t e in t o s igni f i c an t r e d u c t io n s in

hea l t h r i sk b e c au s e t o x i c i t y v a r ie s b y pollu t an t a nd whe t h e r o r not

t he r e a r e e x p o s u r

e s a t o r a b o v e l e v e l s o f c on c e r n i s no t k nown

. F or

e x a m ple

, a c e t al d eh y de m a s s e m i ss ion s a r e m o r e t han doubl e a cr ol e in

e m i ss ion s on a n a t i o nal ba s i s

, a cc o r din g t o E PA ’ s 2 005 Na t i onal

Em i s s i on s I n v en t o ry ( N E I )

. Howe v e r

, t he I n t eg r a t ed Ri sk I n f o rm a t ion

Sy s t e m ( I R I S) r e f e r en c e c on c en t r a t ion ( R f C ) f o r a cr o l ein i s c on s id e r ably

lowe r t han t h a t

f o r a c e t al d eh y de

, s ugg e s t in g t ha t a c r o l ein c ould be

po t en t iall y m o r e t o x i c t h an a c e t al d eh y de

. T hu s

, i t i s i m po r t an t toa cc oun t f o r t he t o x i c i t y a n d e x po s u r e

, a s we l l a s t he m a s s o f t he

t a r ge t ed e m i s s i on s wh e n d e s i gning r edu c t ion s t r a t egi e s t o m a x i m i ze

hea l t h ben e f i t s. ( f oo t no t e 1 ) De t ail s abou t t h e o v e r a l l c on f id e n c e o f c e r t a i n t y r an k ing

o f t he indi v id u al pie c e s o f N A T A a ss e ss m e n t s in c lud i ng b o th

qua n t i t a t i v e ( e

. g

., m o d el

- t o

- m o n i t o r r a t io s) and quali t a t i v e ( e

. g

., qua l i t y o f d a t a

, r e v iew o f e m i ss ion in v en t o r ie s) jud g e m e n t s c an be f ou nd

a t h t t p : / / www

. epa

. go v / t t n / a t

w / na t a / r o y / p age16

. h t ml

. "

4

. O M B a sk ed whe r e t he L M L s t a t e m e n t r ega r d i ng c o n f id e n c e d o wn t o 7 .5

ug / m 3 wa s m ade p r e v iou s l y

. T hi s s t a t e m en t wa s in t he C e m e n t N E S H AP R I A,

a s t h i s wa s t h e l a s t R I A t h a t had ai r qua l i t y m odeli n g.

Rega r d s,

Bry an

D r

. Bry an J

. Hubbe ll

Lea d e r

, Ri sk a nd B en e f i t s G r oup

Heal t h and E n v i r on m en t al I m pa c t s D i v i s i on

U

. S

. E PA

/ O A Q PS ( C5 0 4

- 02)

R T P

, NC 27 7 11

( 919 ) 541

- 0 6 21

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

/ U S

T o : A my La m s o n / R T P / U SE P A / U S @ E PA

Da t e : 02 / 15 / 2 011 10 : 37 PM

S ub j e c t : F w : A dd i t io n al I n t e r age n c y Co mm en t s on B oile rs R I A

I b e lie v e t h i s wa s m ean t f o r y ou a nd n o t Am y Ha m b r i ck.

Br ian

----- F o r wa r d ed b y Br ian S h r age r / R T P / U SEP A

/ U S o n 02 / 15 / 201 1 10 : 20 PM

- ----

T o : B r i a n S h r age r

/ R T P / U S E PA

/ U S @ EPA

F r o m : " Hig g in s

, Co r t ne y " < Co r t n e y

_ Higgin s @ o m b

. eo p

. go v>

Da t e : 02 / 15 / 2011 06 : 58 PM

C c : T o m W a l t on / R T P / U S E PA / U S @ EPA

, Robe r t J W a y land / R T P / U S EPA / U S @ EP A

, A my

Ha m b r i ck / R T P / U S E PA

/ U S @ EPA

S u bje c t : A ddi t ional I n t e r agen cy Co m m en t s on B o i le rs R IA

( S e e a tt a c hed f i le : B oiler

R I A __2

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. do c)Hi B r ia n,

A tt a c hed a r e addi t iona l in t e r ag e n c y c o mm en t s on t he B o i le rs R I A.

Re g a r d s,

Co r t n ey

[ a t t a c h m e n t " B o iler

R I A __2

_ 11_11_i n t e r a g en cy c o mm en t s unde rE O 1 2866 F eb15

. do c " de l e t e d b y A my

La ms on / R T P / U SE P A

/ US