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### H i J o e l,

P e r t h e vo i c e m ail I j u s t l e f t f o r y o u

, a tt a c h e d is t h e p H a n al y sis f r o m A P S a nd A E C O M i n r e s p o n s e t o qu e s t i o n 4 o f y o u r

e m ail d a te d 5 / 2 9 / 1 4

. A s y o u s ee i n Ric h ar d ’s e m ai l b e l o w

, t h e a n a l y sis A EC O M d i d w as c o n s e r v a t i v e f o r t h r e e m aj o r

r e as o n s

, a nd t h e r e s u l t w a s a n e s t i m a t e d pH o f 4

. 6

, w h ic h is cl o s e t o y o u r e s t i m a te o f a pp r o xi m a te l y 5

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A s I m e n t i o n e d i n m y v o ic e m ail t o y o u

, I w ill b e o u t o f t h e o ffic e o n w o rk-r e l a te d t ra v e l n e x t M

- W a nd o u t o n l e a v e T hF ri

. I f y o u h a v e a n y qu e s t i o n s o n t h e pH a n al y s i s o r t h e B A

, p l e a s e c o n t a c t R i c h a r d Gri m e s d ir e c t l y (a nd p l e a s e c c m e if

c o nn e c t v i a e m ail)

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a b o v e )

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T h a n k y o u

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A n i t a L ee

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S u b j e c t: Re sp o n s e t o Ra i n pH q u e s t i o n f r o m U F W

Re c ent dat a f r o m the Na t i o na l A t m o s phe r i c D e po s i t i o n P r og r a m ( N A D P ) 2 01 2 s umm a r y ( http:// na d p. s w s .u i u c .e d u/ li b/da t a/ 2 01 2 a s .pdf ) d i s p l a y s an a nn u a l a v e r a g e pH o f 5.5 f o r p r e c i p i ta t i o n i n th e n o r thwe s te r n

pa r t o f N e w Me x i c o ( t o t h e ea s t o f the p r o j e c t a r ea )

. A c on s e r v a t i v e e s t i m ate o f r a i n pH c o u l d be m ade b y u si ng a pH o f

5.5 a s a s ta r t i ng p o i nt a nd ad d i ng the h y d r o n i u m i on c on c ent r a t i o n f r o m m ode l i n g to t h e a nn u a l r a i n f a l l w i th o ut

c on s i de r i ng a n y b u ff e r i ng f r o m pa r t i c u l ate s

. I f w e a ss u m e that the a v e r age an n u a l p r e c i p i ta t i o n f o r the F a r m i ngton

, NM,

a r ea i s 8.5 9 i n c he s pe r y ea r * ( 21.8 c m / y r) w i th a s ta r t i n g p r e c i p i t at i on p H o f 5.5

, t h en a dd t he t ot a l h y d r o n i u m i on

eq u i v a l e nt s d e po si ted on th e s o i l ( w o rs t c a s e o f 0. 0 04 7 h y d r on i u m i on e q u i v a l e nt s eq u i v a l e nt s /m 2 / y r ba s e d o n m ode l ed

depo s i t i on )

, t he r e s u l t i ng p H s upp r e ss i o n w o u l d b e 0

. 9 ( o r a c h a ng e i n pH v a l u e b y

- 0

. 9 ) f o r a p r e ci p i t at i on p H o f

4.6

.

T h i s i s c on s e r v a t i v e b e c a u s e:

· It d o e s not a cc ount f o r b u f fe r i ng tha t o cc u rs i n t he p r e c i p i t at i on. W ate r d r op l e t s i n th e a i r

, e s pe ci a ll y i n th e we s t, f o r m

a r ou n d a n d c o l l e c t du s t p a r t i c l e s t hat a r e o f ten c o m po s ed o f c a l ci u m c o m pound s a nd o t he r b u ff e r i ng ag e nt s b e f o r e

c o m i ng to the ea r t h a s p r e c i p i ta t i on

. T h i s c au s e s pH b u ff e r i ng r e s u l t i ng i n a h i g he r pH.

· T h i s c a l c u l a t i o n i n c l u d e s t h e d e po s i t i o n o f a l l a ci d i c de po s i t i on f o r m F ou r Co r ne rs P o w e r P l ant not j u s t t he i n c r ea s e i n

H

2 SO

4 e m i ss i on s r e s u l t i n g f r o m the i n s ta l l a t i o n o f S C R

.2 · T h i s c a l c u l a t i o n a ss u m e s a ll a ci d d e po s i t i o n i s wet d e p o s i t i on. In r e a l i t y

, o n l y a f r a c t i on o f

the a ci d d epo si t i on i s w et

depo s i t i on d ue t o l i m i ted r a i n f a ll i n t he a r ea. T he r e f o r e the i m pa c t on p r e ci p i t at i on pH w o u l d be m u c h l e ss

.

G iv e n t ha t th e t o ta l a m oun t o f a c i d- f o r m i ng c o m poun d s e m i tted f r o m the F C P P w i l l b e m u c h l e ss i n th e f utu r e d ue t o t h e

s hutd o wn o f U n i t s 1, 2

, an d 3

, th e f utu r e i m pa c t s f r o m a c i d i c c o m pound s de p o s i te d i n t h e r e g i o n w i l l be l e s s tha n h i s t o r i c

c ond i t i o n s

. T he s m a ll a m ount o f a c i d- f o r m i ng c o m p ound s c o m i ng f r o m F C P P wou l d n o t r e s u l t i n a n y t h i ng cl o s e t o

p r e c i p i ta t i o n o f

pH 3

. 0 r e po r ted b y

N e u f e l d t o c au s e f o l i a r da m age t o p l ant s

.

* ht t p:// www.u sc li m ated a ta

. c o m / c li m ate/ f a r m i ngton/n e w

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Th i s m e ss a g e i s f

o r t h e d e s i g n a t e d r e c i p i e n t on l y a nd m a y c on t a i n c o n f i d e n ti a l , p r i v il e g e d o r

p r op r i e t a r y

i n f o r m a ti on. I f y ou h a v e rece i v e d it i n err o r , p l ea s e no ti f y t h e s e nd er imm e d i a t e l y a nd d e l e t e t h e o r i g i n a l a nd

a n y c o p y o r p r i n t ou t

. U n i n t e nd e d rec i p i e n t s are p r oh i b it e d fr o m m a k i n g a n y o t h er u s e o f t h i s e- m a il

. A lt hou g h

w e h a v e t a k e n r ea son a

b l e p re c a u ti ons t o e nsu re n o v i r

us e s are p re s e n t i n t h i s e- m a il

, w e a cce p t no l i a b ili t y f o r

a n y l oss o r d a m a g e ar i s i n g f r o m t h e us e o f t h i s e

- m a il o r a tt ac h m e n t s, o r f o r a n y d e l a y o r e r r o r s o r o mi ss i ons i n

t h e c on t e n t s w h i c h r e su lt fr o m e- m a il t ra ns mi ss i on.