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# OAR Box 1790 Prepped by Keeia Richards



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Number: 

# 236 ) ll-F-2 6 Docket Number: 

# A-90-3 7

Printed 10/31/200812:43:17

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estiaat e ambien t concentration s resultin g fro m th e long rang e transpor t o f pollutants . Xnaddition , i t i s sometiso s neoeesar y

t e conver t aabien t concentration s t o value s tha t reflec t effect s o

nspecifi c AQRV's . Question s hav e arise n sbou t vhethe r specia l modeling analyse s performe dt o asaes e th e impact s onClas s I area s (PSD inerepent e and AQRV's ) PRELZKXKAP. YffA M

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I f a propose d soure e doe e no teaue e o rcontribut e t o a n inoreaen tviolatio n i n a Federa l clas s Z area , sectio n 115(d)(2)(c)(ii ) o f th e Ae tprovide s tha tth e FL M meyjieyertheies B demonstrat e t o th e satisfactio n o f -the — y( j**'-£Sfca*e~W-ia

tth e emission s fro ath e propose d sourc e wil l hav e an advers e iapae te n th e AQRV' s o f a Federa l clas s I are a and th e permi tshal l no tb e issued . Recen tpermi t controversie s hav e underscore d th e nee d fo rnationa l guidane e addressin g th e Other' s rol e i n aseeeein g a FLM' G r advers e ixnpaotdeterminatio n i n thes e circumstances . The ,EP A polic y currentl y provide s that , i n ligh to f th e FLM'5 expertise , tft e permittin g authorit y mus tgiv e i a aJu l ialiT*i"uu

i > ai Je tu tio n t o aFLM's advers e impac t determination . However , th e fina l decisio n rest s vit h th e permittin g authorit y an d i tma y rejec tth e FLM' s assertio n a e lon g a s i tha s a rationa l basi s ro rdoin g so . fififi s o F R 28544 , 2854 9 (Jul y 12 , 198S) ; se e a^eo Old Dowinio q Ele-cjrle * Cooperative . PS

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D Appea l Nos . 92-3 , >» , 92- 4 k 92- S (Oct . 5 . 1992) , th aSPA' S Environmenta l Appeal s ~\Vnj Bear d hel d tha tVirgini aerre d i n summaril y rejectin g th e -h-B-y findin g o f th e •£>«*<*

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Administrato r aus t b e obtained , an

d thei r us e mus t b e subjec t t o notie e an d opportunit

y fo r publi c comment . Th o curren t languag

e aaJce e n o distinctio

nbetvee n model s used fo

r Clas s I I are

a analyse s an

d clas s I analyses , an d th e EP

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e ther e i s an y reaso nt o conclude tha t suc

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e made . Thus , vhil e n o regulator

y change s ar

e bein g proposed , th

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d ou t unde r the PS O progra

m t e e e base d e n$£*?'EPA-appTt&W~sr c len t pollutan t concentration s /nScjm/t^r'jT^t'r-vct-.tt.iz

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g change s i

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(wate r chemistry ) resultin g fro m ai r qualit y change s cause

d b y emissions increases , othe r model s als o exist , vhiehar e i

n variou s stage s o

f development . The SP A doe s no t believ

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g PS D regulations , i naddition , the EP A doe s no t believ

e tha t suc

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d i n exactl y the sam e manne r a

e medal s whic

har e use d fo r PS O purpose s t o •predic t ambient pollutan t concentrations . Th e specia l model s tha t na

y nee d t o b e use d fo r AQR V analyse s should , M1LIWNAR Y8TAFF WORKIN G DRAFT FO

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