UNITEDSTATESENVIRONMENTAL PROTECflONAGENCY WASHINGTON. D.C. 2W60

I



# - -E?,i;HQ~NSUBJECT: 

### P& D 

### N~W sawroe aaviev (part D 

### NSR) 

### ~hr-ate for 

### to htkdnmenc

for 

### Air and 

### Radiation (6101) Director, 

### Pesticides and 

### Toxfcs Hanagemeaat 

### ~ivision,Rageons 

### I and Ilt Direct-, 

### & 

### and Waste Xanagement 

### aivfsion, Region 

### XI DireEtdr, Air, 

### Raaation 

### and 

### ~oxi& DivJTsian, '.- 

### Region 111 

### -' Director, 

### Air and 

### RaBiacion ~i~isi~, Region Y Director, 

### Mr. Pesticides 

### and Toir2os Division Region 

### VI Director, Air 

### an4 Toxfea Division, 

## - Regions 

### VXI, VXU, fX, and X

T
. fntroduct5on With 

### ais 

### oemorandrim. EPA 

### is amending one 

### aspecr: of 

### guidance Issut:J September 

### a. 1992' 

### amd SepQemb~~ 17, 1993' 

### regarding r cqrtirements 

### for 

### nohattairrmeat 

### areas requesting r&esignalion to atre ~nmenc- Xn Waese 

### previ- maaoranda, EPA indicakd 

### tbat Sc..;tes 

### must 

### submit and 

### receive full approvat 

### of any 

### part 'DWSR 

### rng~.t'ra t

### i~ns that 

### weremireU 

### by the Aot 

### tq he subitted 

### to EPA prior- 

### to or at M8 t5mo 

### of tAe suloni~~ion of: a 

### ocmpleta redesignation rt=quPct.. 

### The ESA 

### has.reconsidered +bat policy, howevec, 

### and iscistaltlisbFag a new po3.icy 

### under vhich


### - * Y> -*9- 

# .

- 'murrorandum 

### entitled, nProcedures far Precessing Requests to 

### Jzel'f(.siynate 

# rea as ta Btbhent,

## " from John .Calcaghi, Director, Air ~\u.~l ~ity 

### ~anag-ent ~ix-ision, to Regional A& 

### Divisionij11-tctc:rszhfcmorandup 

### enticled, "SIP Requirements 

### for Areas 

### Sumitthg r:c~quests

### for RedesignatIan 

### to,~ttahent of the ozosa 

### and CO t:L49S On 

### or After 

### Navember 15, 1992." 

### frorn ~ichaek 

### H- Shapbo, I~cti.ng' Assisr;anr 

### ~dministirator 

### for Air 

### and Radia.cicm, to 

### Regional Air ~ivisiah 

### Directors.2 norra~~ainment 

### areas may be leQesignated to at+llhenk not=+th==tanaing

### the lack 

### of a 

### fully-approved part D 

### NSR prowam, 

### Pr?y~dedthe program 

### is not relied upbn 

### for m~rineenan~ec3h 

### atldxtion, BPA 

### is no+ reqpairiag 

### thr existin 

### pat-t D WSR XUIQE bo 

### - place4 

### in UE 

### &n+ingeacy -on ~f +be nka%aOPmansc plata 

### i. pursuant 

### to se~~ zv5A. of 

### tZle Llcts- 

### As dismasjseul 

### belaw, ,$

I 

### however, SPA 

### hel5evas its 

### nrnv policy 

### vLll asstzra that 

### the 

# - P 

### statutory goals ef part 

### D LISB and 

### secrian Z7SA b prated 

### and -* % 

### 'maintain the NAAQS 

### are achiuwed. 

### The EPA believ=s that 

### us nee policy fs 

### justifiabls 

### undar th1? Agency's general autho~f- Cu establish &e 

### mini* ex~ptiotrs ~CatUtOry requirements where the application Of 

### the S*~U~OW 

### . 

## . .-



# -.

- - =.qiiirt*ments 

### would be of trivial 

### ar no ~Aue 

### envit.ohm~tally. !See-

### ~~~%v~er.oo~ v, -e, 636 

### F.2d 323, 360-61 (b-C. CirISTC!. 

### : IT:. packsroand/Clean Air.Act 

### Reementa , secticzn lo7(d)(3)(EJ oithe Act 

### requ5xw that a Sab 

### have in place a 

### fullpappreved 

### SIP 'ioeetlng 

### a= the 

### requirements applicable to 

### a nazaattahemt 

### area.wde sewoh.110

### -and 

### p& D 

## - of 

### title I or 

### the Act 

### h order f~ the 

### area 

### to. be 

### tsdes~gnatee to 

### atkiinment

# - In addition, section f75~ 

### requires 

### ;that the

### .area wt 

### haw a 

### fully-appsoved-meint~ance plan 

### aantairring contingenay 

# ..-
KJrwvis 

### ions, as necessary, to

### -psamptZycoxz~ct 

### aay violation af 

## .. the applraable NAAQS 8atacaks aft:- 

### Zdesignatian of Uae-err-- At a 

### minunurn, the 

### oonting-w 

### plan must 

### *Include a reqrrfi=emant that the stake 

### wilZ izqplem&nt: alJ. mezis1Lres 

### wi- respect 

### to tbe cantrol 

### of the air

### poll-t concerned Wish vere contain& 

### in the state 

### ialplementaMon 'plan

### for the 

### area before 

### redesignatf on af 

### the area as M 

### attafmat The NSk 

### requiremats 

### -areurntataine8- 

### in se&&ea 110fa)(2) (C) and 

### in parts C and 

### D 

### of title 

### I Q$ the Act+

# _ Broadly speaking, sectinn 110(a)(2) (CJ of .the

### act .rpan4ate&

### tbe deValoprperLt of 

### a prv~construction 

### review progrmm b assrrcp. that 

### me ~onstructioh 

### or modif5cation af any 

### stationary aeurce 

### L6 

### oonsietent:via 

### attainment of 

### the IQUQS. 

### The 

### nonattairrment 

### HSR program in

### part D 

### - fJSR 

### and the 

### atta-ent' area 

### prevention of 

### signfficant dst~rioration(PsD) 

### program 

### in

# *. t! apply 

### ta major aew

### sourdas ahd 

### modifications of 

### exisangarajcsr 

### sauxaes-. (Implwemting :--c:gr;lations that setfbrth 

### minimum reguctreaenrs for Sxate 

### or I.o*r::il programs and Federal 

### pesrnitring progrqm8 &awe been :~romulgated ar 40 CFR part S1 swart L atrd appendix S, 

### and 40 CFR section 52.2 1, respaotively, ) To assure that 

### ma$or new 

### or 

### modiried ~o~ces 

### do not ihterCere with reasonable furthe 

### pr-ess 

### tawarda.attainment, nonnttaihmen-t: area 

### part D NSR 

### requires installation of cpntrolHA nu. 

# .

# --- - . . 

### ......-.. 

### ...,.-.- . 

### -.'

". .- ',
. Gi

tachnuloq y 

### representing the 

### lavest achisvsble emf86iotts 

### r+h (LAER) and emission offge-, TO

### prevanc "clean airYeeaS 

### from sigiriricant degradation, 

### me P6Q 

### program 

### rcqu&es- 

### inscallatian of

. hczsl: available.' 

### control 

### technolw (8ACE).and 

### plodelm 

### to 

### Bhov that the 

### new or modified SQUms?vi11

### not awe

### or oontribu* 

### to

. ., . *.r vLdar.ion 

### of a HmSor a PSO a.lr 

### ,qualitygr- incra~t-
-. ... . * : . .?

. .

.. 

# -. :- 

### -

... , 

### ~tmvious~y, ed thoge &ov-ioas wether to 

### - ' 

### ".. 

### r+;gl~ire that 

### any ~~a%~rdesignation 

### tm atti-at -st hzve fully-approved p+ 

### D 

### NSR 

### #lee 

### as part or ths required frrlly-approved SIP- In additLma, up~n 

### rdeoignation, tbe 

### part 

### D S ." 

## < PSI? rules were tzo be placed 

### in tho 

### naihten~oe plan 

### contingency prdvisions 

### In accordance 

### ~5th aectbn 175A 

### of the Act-unl-S tbe area needad to 

### oontfnus implementing pa* D NSR. as 

### one elerrrent 

### of the mai?xtetlan& 

### strategy. .! YXT- NSR 

### PV~ICY ahd Leua- 

# - --. 

## --- .-. .-. . .& 3 'P The EPA now 

### believes that a $e 

### rshifis exacption 

### to 

### ae 

### + requirement 

### of 

### soctioh 1127 

### (d)(3)(8)ioz.

### part IY NSB; 

### k 

### justlf idle- i because 

### requiring 

### the adoption 

### am¶ full apgrovaL aC 

### a pfut D 

### NSR -- pragrarn 

### as a prerequisite 

### to rta5esignaticur vould 

### not be 

### of significanr environrpental 

### value 

### jh c-in 

### circumstanacs. The .-- . L=*- has reconsidered its earl+- position becauac, once axoa 

# .- is rceesignated tlo attainment, 

### fhe part 

### D NSR prom 

### mybe rcpla~~a by rho corollary 

### PSD 

### program. if 

### it is show 

### wough the ~k3;atennncc demonstration that 

### tha area, 

### will

### maintain 

### without part ll NSR 

### and because 

### part 

### D NSR need n'at 

### .beoome. p- of.

### the

## - 

# - . - ~onzlngency plan, 

## - ?

. Z k

## . Fra-construct 

### ioni 

### xevitzw Programs 

### in Attaimeht- 

### Ar@aS - . id.

. . There are several 

### provisions 

### in 

### the Act 

### and 

### Ln EPA!e reqularions that;require 

### precansttcrctiorr tavfetq 

### of JLeY Dt w.~d Ff5cd major sources 

### in actah& emsto aS8esS khe hpad at' i..he proposed emfsstans haceases 

### on the 

### appbicable rrAAQS. These Lnclude the .PSDprogram uhiib covers 100 ten. year 

### (.=I

. or 250 tpy 

### or greater 

### sources (depezadbg oh 

### the source mCegotry), the? 

### precohstruction 

### review 

### rsquSllefnents of 40 CFR 51,T6S(b) 'that 

### cover LOO 

### tpy 

### or greater sources,. and the 

### 1nterpr~tiva.Offset RU~. 

### As ta 

### ozone, there 

### are sane. 

### particular 

### requirermenks 

## Mat apply. The EeA 

### believes.these 

### programrs 

### will ensure-thatma

### jar new 

### sources ;md 

### modifications are 

### given adequate 

### preconstrudonreviewAfter redesignation 

### to attainment, State PSD 

### rules, 

### or Federal P5D rules ih 

### a delegated 

### program., must ensuto, as rc?quked by 

### sections 165 (a)(3)

### [a) and ilo(a) (21(C) of the Act, [.hat preconstructios 

### ravfew 

### of nev and 

### aodiZLed 

### majot sources 

### will prevent 

### increases 

### ih smissions that 

### vould cause or +:ont.ribute to violatiens of the HAAQS- [see 40 CFR 51.166 (k)

## , 40 CfR 52-21 (k) ]

## 't 4 

# - In

### addition, 

### EPAts

### regulations at aa eFR 51.165(b) 

### ramre that 

### SIP'S aontain 

### preeonsmUon raviev -frQ1Pente 

### tbak "PPLY nay 

### or -modified

### 100 tpy.

### or -eater souraes'

### of a ! 

### Pollutant 

### in 

### areas des&mswaat t 

### or unolas6$Xia4la for B 

### acpollut~t ih mSas 

### the= nodlfid 6-a VOU~~ 

### . 

# d contribute to 

### J 

### vioiation af a WAZLBI. 

### Thle

## .req;u~~t -4as 

### - 3' 

### for preconscmction rederr-.far

### sources that are exempt 

### Lraa PSD dye PSD

### ' s 

### higher (250 

### tpy) 

## majar acrurce threshold for 

### mirr 

### source 

### categories. In Meabsence af 

### SIP plrrvfsiana tbat 

### cXaply vlth 40 

### CrirR tr3.166 

### (b) or a 

### part D NSR 

### prograan, 

### States uslrld have 

### to use eta 

### Interpretive Offset

### Rule at 40 CPR 51. 

### rtppandix S 

### as & surragate rule 

### for gerzsitting 

### new 

### ara modified

### major SO- 

### in these 

### 22.tni.nmehL 

### areas. 

### (See 45 

### PR 31310, 

### L3ay 13, 1980.) 

## -. $or 

## sq,

## PEI-lo, NO,, 

### and co, F@A 

### bas 

### established 

### lavels of ~sbient impacts to determine 

### vhehrri 

## me .major 

### new ot 

### rncxlified ~?=CC would cause 

### or cbntriht;e 

### to a violatSon- Whee the 

### source 

### is .f 

### eund to cauje 

### qr 

### contribute to a 

### vialakion, the source sou3.8 

### be subject 

### to more 

### atriagent-teCIhnologyand edssions

### - 

## . 1n't.i gation 

### requFrement6 of 

### append& S ar a 40 CFa 51,165 

### (b] 

### ~r o$raR

## - with particular respeak 

### to OZMe. 

### because 

### of tha 

### difficulty in .)nzrdaling 

### the impact 

## oP mnisicms.fram specifLC sources 

### on I , 

### azon~ f

### ormakion, 

### .EPhregulaticms: I40

### CFR 51,165 (b)

### (93 and I 

### appendix S] 

### do not'fully a@t!r-e bav 

### smissioas-

### of aaone precursors 

### shauld be 

### treated 

### to assure 

### that ~lajor 

### nair .a modlffsd 

### souroe 

### do not 

### cause 

### or contr=te 

### to 

### a NABQS 

### violatian. ticeertheless, 

### if 

### prcoonstruetian mcuritoqfng 

### .orother Warmation 

### indicahs 

### the area 

### is not aonthuhq

### ta 

### meet f&z 

### standard 

### aftex redesigmtion to 

### attaiment, 

### appendix S 

### or 

### a 40 C9a 

### 51-26S(b) program would 

### a'lsa 

### apply. The gPB 

### bslieves that 

### .iniuay area 

### that .is 

### designated 

### or 

### redeelgnated as atta3hra-t 

### under sWon107, 

### but experiences ~ialatians of .Ure SBAQS, 

### these 

### pruvisions (and any 

### Implementixig 

### SIP provisions) dniould 

### beqin%erpret& as 

### requiring 

### major new 

### or modified sources 

### to 

### obtaln QOC 

### enaissfan -



# .v uf

### fsets .of 

### at least,:q I: 1 

### ratio, and 

### as pre'whkf 

### Icorrsistent w

### icl~ 

### :ec~ion 182

### .tE

### 11 

### .*at 

### .I : 1 Nox 

### .off sets 

### are 

### necessary,a 

# .- . a,;. 

### Tn aadition;-atkaihment 

### [PSD) 

### plans require that 

### .r~aj&r aew a:~ti

### ~odified 

### sources apply ACT- 

### Geperally, 

### BACT difrars frcrm
'T c. :: 

### by 

### enabling permittifis 

### autharitzes 

### to justify, based 

### on

-?he EPA is 

### in the process 

### of 

### revising ~A'S 

### rulw for 

### NSR e;id 

### PSD, some of 

### which will

### replace appzhdk S. Hwevcr, 

### the prcpos::d 

### revisions 

### will not, ahange'

### the 

### subsbntive panuitting r~qsiremcnrs vhere 

### an attainment 

### area 

### Is vialatbg the 

### ozone NMQS.FW NO. : 520-622-1622 

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### y+-

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..

### . . . ,..

.

i o-ccrtearic, 

### criers, 

### an4 einviron~ental ,basts, the 

### use 'of 

### qntrol .L =~:=Imologies less 

### effective than 

### the 

### most 

### stringent a-llabla. 

### ,Z Xn an 

### area that 

### is 

### not ,meat- 

### *a YGBAQS, 

### EPA bslievee tbak -. 

## ? to 

### Zomsideratian of t?ae

### KAAQS v&olatians, 

### tbe Stake Wyiplpase 

### a. mbre 

### stringent level ag 

### con-& 43sa.n dgbt: be othervise 

### releafed.,g as BACT. [See

### Draft N&WSourere SbdeUManual, page 8.54 (90q'; 

## . 1990). ) : ,. 

### Taken together, these 

### preao~etru~fon review 

### programs aua 

### sr,kure that 

### major 

### new or modfiied sources adaieve 

### the 

### statutory gzal-. of p;re 0 

### NsR and the 

### maintenance 

### provisions of 

### seation 17'38. 8.


### . Part D NSR 

### and ConiDgoncy 

### ~ovisions ltequirhg the full approval of 

### a part 

### D W8R 

### -am 

### voula I ensure that the,

### progl=arm 

### would berr~~e 

### a cgntingency 

### provision 

### in rhe 

### maintehance

# P- As staw above, 

### purswult trr 

### sectla * , 175A(dl and sect 

### on la7Cbl 

### 133CE), 

### as

### cmtingenq planmust I contain, 

### at a 

### miairnun,

## -a14 

### m-es ~d~laed 

### in the 

### nonattainmyt SIP- aoVevez, 

### EPB 

### Its fakmreting tke t;erm 

### *'me;lsurea

### as used 

### in. sectiorr 175A(d) F.Q 

### as not irrclude p= 

### D " NSR. ' The tesro wmeasurea 

### ia 

### not defined In 

### seckibst 175A(d] 

### .and Cengsess.

### utilized 

### that: tm 

### dif ZerentLy 

### In dbfrerat provisfOZS al' the Act.

### with respect to the 

### PSD add p& 

### D 

### KsR-perdt-g ' 

## - pZ.ogrizw, For 

### example, 

### in seda Ilrs.(a$(2)-<A) ; ~0Ia~k6 

### - zcqcired that SIP'S 

### include fianfore.eable'aission

### lhitat~ans 

### ah& 3?!16:- 

### i:orrtrol 

### measures, bexns, or techniques

# - - - a.s %say be 

## . . nlri-t.:s:sr;ry 

### or appropriate 

### to meet tha applicable. 

### reguirasnts of !:z63 AC~. li 

### In section 110 

### (a)(2) (c)

### , conrrress required -Chat

### SlF~s i.~cludt "a program 

### to provide.far 

### the -for-= of ,ac peasutes dercri bed 

### in subparagraph (A) 

# , regulation-of- kbe 

### modification 2nd 

### construction of any 

### stationary source 

### within Uae areas r=:.~ivs~-ed by Was plan 

### as necessary to assure that 

### .nationalambtent a;.= qaality sta6c¶azds

### -are achieved, 

### indl'uaing .a perlmit 

### prograa 

### as required 

### in parts 

### c and 

### D (

## i- e

# - , PSo and 

### park 

### D ISR)

# . * pmpha'sis a.5tkd. ) 

# - If the be& ''keasure~,~' 

### as uee 

### in sections 11Q(a) (2) (A) and IlS { h)(21 (C)

### , had been intended to 

### include PSD 

### and part 

### D'

### WSR, thaz-e 

### would have 

### kenho point 

### to requitfng 

### that 

### 6XP9sinclude b3bh 

### msasuies preconstruetian 

### reviev under pdTts,C and D 

### (PSD or- part 

### D NsRl

# . Thus, 

### in sect5ons 110(a) 

### (21 CAI and (C), 

### it 

### is apparent 

### that Congress 

### distlnguiohed 

### the requirement for 'lrncasurcs'tfrom the requirement far 

### preconstrudon review nrograms. On the 

### ather 

### hand, 

### ih other prsztlslone of the Act, sucti as serrion 161, Congress appcax6 b

### have included 

### PSD within tlic nctrpe 

### of the 

### term nmeasures.wThe 

### face that 

### Congress 

## used tbe um&ri.med torsi nmcaa~en 

### differantly in dirfererrt provisfas of fhe ~ot -1-cap the kehp. 

### is SusceptLbke. to 

### more thaa 

### one intarprctation and 

### th4t E 

### has 

### the discr~tibn to intuxprat 

### st irr a 

### reasasmbIe 

### h the $ Gon=t=xt of 

### seatian x75A- maemu* zts corqmass 

### itealf baa used the 

### tern in a 

### mannw that eluded. Pg) 

### and psrt D 

### NSB iron its =cape, EFA 

### believe8 

### At is 

### ~.easoaztblc ta 

### Snt-t %aswe, 

### as 

### used 

### in eedion USA(&], 

### not 

## eo include 

### part 

### D NSR- Zhe



### .rc3-onabZeness -of air 

### interpsabtiaa is fear

### -ported 

### by &e t



### Cact 

### that PSD, 

### a 

### progrm that 

### 3s t!be

### oorollary 

### ~tpark D rSR

### for 

# - attainment areas, gees into 

### effect4 

### lieu of 

### part D Ha, 

### and. +hat, 

### as disoussad alsave, &A 

### lnteAds to implement the PSD and Pttler 

### NSR proplams In a way that 

### will achieve 

### the ha6ia st4MOxy qoalr, of part 

### D N~R. Therefare, does not 

### believe 

### ttrar pd=

### D NSX need 

### be part 

### of 

### an area's 

### contlngenw 

### plan

### Iv. &her Re-ired P- t The 

### EPA 

### is not cbangihg its 

### prcvSotaply 

### sta+dpolicy with respect to the need 

## fos Statas to adopt 

### and 

### recdve -11 approval 3f ~45~ 

### programs required 

### by the 

### &ce 

### prior to 

### or at *e 

### tima of rhe 

### suhoission of a redesignation request. Tha 

### +shenee O£ a. 

### - - cazsllary program 

### for 

### atfairwent areasdiskinguishespe D NSR 

### L)I 

### 9s other 

### required programs uadcrtr the Act, 

### sucll 

### as errbahce¶ 1:-.s]~set 

### ion and 

### maintenance and reasonabLy 

### nva5labla cpn-01 ?-echaology 

### IRACT) 

### programs, Ybidh-have

### no oorolkury progrum.
I Moreaver,. EPA belfaves that those o-ez requited 

### prq2S.q 

### arecLearly 

### viain the-scope ~f me,

### tam Lmeasuremarz 

### used 

### in sectian175AFor furtsherr 

### informatian re pa= D l~s~ 

### requfrements +or 

### areas redesignating 

### eo attaw please contxtat Caxla Gldllfim 

### at (919) 541-3347; 

### for 

### general irfomatiofi 

### about PSD
-,-

cwZrementss 

# - for 

### attairuncnt areas, oDntact 

### DaisQruarplar 

### at (319) 541-0871.
cc: 

### Air 

### ranch-chief; Regiotrs Z-X 

# -.

'EPA 

### is .not 

## suggesting that NSR 

### and PSD' are equiwlent. 

### but 'r4+.i-i:*1.,r that they are the sane type of program.

.

## .