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, e t c

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S a r a -

T h i s i s a f o ll o w

- up t o ou r 10 / 25 phone c a ll

, and AE C O M' s 10 / 7 m e m o " Re s pon s e t o EPA Co mm en t s on

AE C O M 1

- hou r N O 2 N AA Q S A na l y s i s f o r P H PP ".

B e l o w a r e pa r aph r a s e s o f t he d i s c u ss i on t ha t Reg i on 9 r e c en t l y had w i t h O A Q PS abou t 1

- hou r N O 2

ana l y s e s f o r PS D pe r m i t s

. A t t he end o f ea c h t op i c , I ha v e i n c l uded a nu m be r ed r e c o mm enda t i on f o r

t he ana l y s i s o f t he P a l m da l e H y b r i d P o w e r Pr o j e c t. A t t he v e ry end I a l s o add r e ss t he 3 y ea r v s

. 5 y ea r s

o f m e t eo r o l og i c a l da t a i ss ue

, and an add i t i ona l i ss ue on t he c u m u l a t i v e i n v en t o ry

.

W h il e t he r e i s no t a s t r a i gh t " y e s / no " an s w e r on s o m e o f t he s e , t he r e a r e s o m e r e c o mm enda t i on s f o r

add i t i ona l do c u m en t a t i on on s e v e r a l o f t he i ss ue s t ha t w ou l d he l p u s en s u r e adequa t e j u s t i f i c a t i on f o r

v a r i ou s app r oa c he s

, a s en v i s aged i n t he " A pp li c ab ili t y o f A ppend i x W M ode li ng G u i dan c e f o r t he 1

- hou r

N O 2 N AA Q S "

, m e m o r andu m f r o m T y l e r F o x

, 2010

- 06

- 28.W e app r e c i a t e t he s ub s t an t i a l w o rk t ha t ha s a l r ead y gone i n t o t he s e i ss ue s

, and y ou r pa t i en c e a s w e

app l y e x i s t i ng gu i dan c e f o r t he ne w 1

- hou r N O 2 s t anda r d t o pa r t i c u l a r c a s e s.

I w ou l d be a v a il ab l e t o d i s c u ss t h i s m o s t t i m e s du r i ng ne x t w ee k ( t hough no t T ue s

. 11 / 2 f r o m 11

- 3

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on T hu r s

. 11 / 4 ).

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No t e s on 1

- h r NO 2 f r om 2010

- 10

- 27 c a ll w i t h O A Q PS

, w i t h r e c o mm enda t i on t o pe r m i t app li c ant

I N -S T A CK N O 2 / N O X R A T IOS

S hou l d no t j u s t c i t e c on v e r s a t i on w i t h equ i p m en t v endo r on r a t i o s ; p r o v i de i n f o r m a t i on and / o r da t a t ha t

t he r a t i o c on c l u s i on i s ba s ed on.

S hou l d no t j u s t c i t e li ne o f a t ab l e p r o v i ded b y e

. g

. a l o c a l D i s t r i c t; p r o v i de do c u m en t a t i on o f da t a i t i s

ba s ed on

, a r gu m en t f o r s i m il a r i t y o f t e s t ed s ou rc e equ i p m en t t o p r o j e c t be i ng m ode l ed.

No t e t ha t t he i m po r t an c e o f t he i n

- s t a ck r a t i o v a r i e s b y s i t ua t i on . F o r a s ho r t s t a ck ha v i ng pea k N O 2

i m pa c t a t f en c e li ne a t n i gh t, w i t h li m i t ed m i x i ng and l o w O 3 , t he r e w ill be li m i t ed N O t o N O 2 c on v e r s i on

be y ond w ha t i s i n t he s t a ck

, s o t he i n

- s t a ck r a t i o w ill be cr u c i a l

, and c an de t e r m i ne t he o v e r a ll an s w e r ;

s t r onge r j u s t i f i c a t i on needed f o r a l o w r a t i o . F o r a t a ll e r s t a ck w i t h good m i x i ng and h i ghe r O 3

, r a t i o i s

l e ss i m po r t an t ( and c on v e r s e l y

, f o r PVM R M t he equ ili b r i u m r a t i o w ill be m o r e i m po r t an t )

. A pp li c an t

s hou l d a ss e ss w he r e a pa r t i c u l a r p r o j e c t li e s be t w een t he s e t w o e x t r e m e s

, c on s i de r ho w t h i s w ill a ff e c t

t he a r gu m en t f o r t he r a t i o ' s adequa cy.

1

. PA L M D A L E R E C O MME ND A TIO N : P l ea s e s upp l y an y a v a il ab l e do c u m en t a t i on

, s u c h a s s t a ck t e s t

da t a

, s ub s t an t i a t i ng t he i n

- s t a ck r a t i o s f r o m v endo r G E . G i v en c ha r a c t e r i s t i c s o f t he s ou rc e and t he

c ond i t i on s unde r w h i c h h i gh i m pa c t s o cc u r

, a s m en t i oned abo v e

, a ss e ss ho w t h i s a ff e c t s t he adequa cy o f

t he r a t i o u s ed.

N O 2 A ND O 3 B A CK G R O UND M O N I T O RS

O K t o s ho w N O 2 c on s e r v a t i v ene ss ba s ed on m on i t o r p r o x i m i t y t o r oad w a y s

, and m on i t o r i n c l u s i on o f

s o m e i m pa c t s f r o m nea r b y s ou rc e s

. S hou l d be quan t i t a t i v e w he r e po ss i b l e

, e

. g

. c o m pa r e m on i t o r and

p r o j e c t s i t e on t he i r d i s t an c e s f r o m nea r b y po i n t s ou rc e s

, r oad w a y s

, a m oun t o f v eh i c l e t r a ff i c.

I n gene r a l

, c ho i c e o f ba ck g r ound c anno t be de t e r m i ned i n i s o l a t i on ; i t depend s on ho w i t i s added t o

m ode l

, and on w ha t c ond i t i on s t ha t ba ck g r ound r ep r e s en t s

. ( W ha t ba ck g r ound s ou rc e s doe s i t c ap t u r e

unde r v a r i ou s c ond i t i on s ? ) Con s i de r w ha t i s up w i nd o f m on i t o r and o f p r o j e c t.

B a ck g r ound c on c en t r a t i on c an v a ry b y d i r e c t i on ( and b y m e t eo r o l og i c a l c ond i t i on ...)

Pr o j e c t and m on i t o r s i m il a r d i s t an c e t o u r ban a r ea m a y add t o a r gu m en t f o r r ep r e s en t a t i v ene ss.2

. PA L M D A L E R E C O MME ND A TIO N : T he do c u m en t a t i on s upp li ed abou t t he

r ep r e s en t a t i v ene ss

/ c on s e r v a t i v ene ss o f t he Lan c a s t e r D i v i s i on S t r ee t N O 2 m on i t o r i s v e ry u s e f u l

, bu t i t

s hou l d be s upp l e m en t ed w i t h a c o m pa r i s on t o t he f ea t u r e s o f t he p r o j e c t s i t e

, s u c h a s d i s t an c e t o nea r b y

po i n t s ou rc e s

, r oad w a y s and t he a m oun t o f t r a ff i c on t he m.

H O UR

- B Y- H O UR A DD I T IO N OF M O N I T O R E D B A CK G R O UND

E x pe c t a v e ry s t r ong j u s t i f i c a t i on f o r t h i s deg r ee o f t e m po r a l pa i r i ng

. A h i gh m on i t o r ed v a l ue m a y no t

happen t o c o i n c i de w i t h a h i gh p r o j e c t i m pa c t f o r t he da t a y ea r s u s ed

, bu t i t s t ill m i gh t o cc u r i n f u t u r e

y ea r s . I dea ll y

, a i m t o s ho w w h y h i gh ba ck g r ound and h i gh s ou rc e i m pa c t w ou l d no t be e x pe c t ed t o o cc u r

t oge t he r

, ba s ed on s ou rc e c ha r a c t e r i s t i c s and m e t eo r o l og i c a l c ond i t i on s.

Longe r t e m po r a l ba s i s p r e f e r ab l e

, and / o r ba s e on t i e t o m e t eo r o l og i c a l c ond i t i on s.

F o c u s on s pe c i f i c s o f t he c a s e r a t he r t han gene r i c a r gu m en t s abou t c on s e r v a t i v ene ss

. E x a m i ne

s pe c i f i c s o f hou r b y hou r ( and s ea s ona l ) ba ck g r ound c on c en t r a t i on

, i m pa c t o f p r o j e c t, i m pa c t o f nea r b y

s ou rc e s ; u s e t h i s i n a r gu i ng f o r a t e m po r a l pa i r i ng s c he m e.

3

. PA L M D A L E R E C O MME ND A TIO N : T e m po r a l pa i r i ng o f m ode l ed and m on i t o r ed c on c en t r a t i on s ba s ed

on m on t h s o r t i ed t o m e t eo r o l og i c a l c ond i t i on s w ou l d be f a r p r e f e r ab l e t han hou r- b y- hou r pa i r i ng

, a s t he

l a tt e r w ou l d r equ i r e m o r e j u s t i f i c a t i on t o de m on s t r a t e t ha t i t i s r ep r e s en t a t i v e and adequa t e l y

c on s e r v a t i v e . T he a r gu m en t t ha t t he o v e r a ll m ode li ng app r oa c h u s ed i s c on s e r v a t i v e s hou l d be

s t r eng t hened . I dea ll y t h i s w ou l d s ho w w h y h i gh ba ck g r ound and h i gh s ou rc e i m pa c t s w ou l d no t be

e x pe c t ed t o o cc u r t oge t he r

, ba s ed on c ha r a c t e r i s t i c s o f t he p r o j e c t s ou rc e

, w ha t s ou rc e s t he m on i t or

r ep r e s en t s a t d i ff e r en t t i m e s

, and t he m e t eo r o l og i c a l c ond i t i on s . I n f o r m a t i on s u c h a s s t a t i s t i c s and t i m e

s e r i e s p l o t s o f i m pa c t s and ba ck g r ound c on c en t r a t i on s w ou l d be u s e f u l i n de v e l op i ng t he a r gu m en t.

E Q U ILI BR I U M N O 2 / N O X R A T IO FO R PVM RM

No t app r op r i a t e t o u s e an annua l a v e r age

. (A l s o no t e t ha t equ ili b r i u m N O 2 / N O x r a t i o f o r PVM R M i s an

hou r l y uppe r bound u s ed i n t he a l go r i t h m

, i s f un c t i ona ll y d i ff e r en t t han A R M r a t i o f o r " a r ea w i de

qua s i

- equ ili b r i u m c ond i t i on s " .)

M a y be O K t o u s e h i ghe s t m on i t o r ed r a t i o a s t he equ ili b r i u m r a t i o . T he r a t i o m a y v a ry b y hou r o r

c ond i t i on ; c on s i de r w ha t t he pa r t i c u l a r r a t i o r ep r e s en t s . I s t he r a t i o u s ed f o r a g i v en hou r c on s e r v a t i v e

f o r t he m e t eo r o l og i c a l c ond i t i on i n w h i c h i t i s u s ed?

4

. PA L M D A L E R E C O MME ND A TIO N : No t app li c ab l e.

M I SS I N G O 3 D A T A P R O C E DURE

No t app r op r i a t e t o u s e an annua l a v e r age t o f ill i n m i ss i ng hou r l y o z one v a l ue s : m i ss e s h i gh v a l ue s t ha t

c an o cc u r du r i ng t he da y.U s i ng t he h i ghe r o f t he m i ss i ng i n t e r v a l endpo i n t s i s m o r e c on s e r v a t i v e t han i n t e r po l a t i on

, bu t f o r l onge r

i n t e r v a l s m a y m i ss an o z one pea k

. E v en i f i t i s O K f o r a pa r t i c u l a r da t a s e t, i t ' s no t a good gene r a l r u l e

t o app r o v e

. B e tt e r t o s t a r t w i t h an app r oa c h gua r an t eed t o be c on s e r v a t i v e , t hen m a k e s pe c i a l c a s e

a r gu m en t s f o r p r ob l e m a t i c hou r s

. ( I n s t ead o f s t a r t i ng w i t h a u s ua ll y-c on s e r v a t i v e app r oa c h and t hen

a r gu i ng t ha t i t ' s p r obab l y O K .)

E x a m p l e app r oa c h : f o r ea c h o f t he 24 hou r s o f t he da y

, u s e m a x i m u m v a l ue t ha t o cc u r s f o r t ha t hou r ( 24

s epa r a t e de f au l t v a l ue s ) ; o r do t h i s f o r ea c h m on t h ( 288 s epa r a t e de f au l t v a l ue s )

. Requ i r e s a bun c h o f

po s t

- p r o c e ss i ng.

5

. PA L M D A L E R E C O MME ND A TIO N : It w ou l d be p r e f e r ab l e t o s t a r t w i t h a c on s e r v a t i v e app r oa c h

, s u c h

a s s ub s t i t u t i on o f a v a l ue f r o m t he c o rr e s pond i ng s ea s ona l o r m on t h l y h i gh hou r ( a s m en t i oned i n t he

e x a m p l e )

. Pr o f e ss i ona l j udge m en t c ou l d t hen be app li ed t o p r ob l e m a t i c hou r s

, u s i ng an a l t e r na t i v e

app r oa c h t ha t c on t i nue s t o i n s u r e t ha t no unde r p r ed i c t i on b i a s i s i n t r odu c ed

. Ho w e v e r , t he app r oa c h

p r opo s ed du r i ng ou r 10 / 25 phone c a ll

, u s i ng i n t e r v a l endpo i n t h i gh s f o r i n t e r v a l s l onge r t han 3 hou r s

w ou l d s t ill be a cc ep t ab l e f o r t h i s pa r t i c u l a r da t a s et

, i f i t i s one pa r t o f an o v e r a ll s ub s t i t u t i on p r o c edu r e

, and i s a cc o m pan i ed b y a do c u m en t ed a ss e ss m en t o f t he r ea s onab l ene ss o f s ub s t i t u t i on s o f 3 o r m o r e

c on s e c u t i v e da y t i m e hou r s i n c o m pa r i s on w i t h ne i ghbo r i ng da y s.

A DD I T IO N A L P A L M D A L E I SS U ES

6

. A s d i s c u ss ed i n t he " A pp li c ab ili t y o f A ppend i x W M ode li ng G u i dan c e f o r t he 1

- hou r N O 2 N AA Q S "

,

m e m o r andu m f r o m T y l e r F o x

, 2010

- 06

- 28

, a s w e ll a s i n G u i de li ne on A i r Q ua li t y M ode l s §8

. 3

. 1

. 2

, f i v e

y ea r s o f r ep r e s en t a t i v e m e t eo r o l og i c a l da t a ( o r one y ea r o f on

- s i t e da t a )

, a r e r equ i r ed i n a i r qua li t y

i m pa c t ana l y s e s

. Ho w e v e r , t he m ode li ng s upp li ed f o r N O 2 a s w e ll a s f o r t he o t he r po ll u t an t s e v a l ua t ed

u s ed on l y t h r ee y ea r s o f da t a

. W h il e t h r ee y ea r s o f da t a m a y ha v e been a cc ep t ed f o r pa s t app li c a t i on s

b y o t he r pe r m i tt i ng au t ho r i t i e s

, o r e v en b y EPA i n pa r t i c u l a r c i rc u m s t an c e s

, w e do no t be li e v e t ha t i s a

s u ff i c i en t r a t i ona l e f o r u s i ng l e ss t han t he 5 y ea r s s pe c i f i ed i n EPA' s r egu l a t o ry gu i dan c e

. A dd i t i ona l

j u s t i f i c a t i on w ou l d be r equ i r ed f o r u s i ng a s ho r t e r da t a s et

.

7 . T he O c t obe r 7 t h AE C O M m e m o c i t e s Ch r i s A nde r s on o f t he A n t e l ope V a ll e y A i r Q ua li t y M anage m en t

D i s t r i c t (AVA Q M D ) a s t he s ou rc e o f i n f o r m a t i on abou t nea r b y s ou rc e s t o u s e i n a c u m u l a t i v e m ode li ng

a ss e ss m en t. Ho w e v e r , t he r e s hou l d be do c u m en t a t i on o f t he s e l e c t i on cr i t e r i a w e r e u s ed

, and w he t he r

t he y m ee t t he r equ i r e m en t s i n t he G u i de li ne on A i r Q ua li t y M ode l s §8

. 2

. 3 on ba ck g r ound c on c en t r a t i on s

i n m u l t i

- s ou rc e a r ea s.

- Sc o tt B.

--

=+=+=+=+=+=+=+=+=+=+=+=+=+=+=

" Sc o tt B ohn i ng " < bohn i ng

. s c o tt@ epa

. go v>

U

. S

. EPA Reg i on 9

, A I R -7

415 / 947

- 4127 f a x

- 3579

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