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### . . . ',. uNITED STATES. ENVIRONMENTAl. PROTECTION AGENCY RESEARCH TRIANGl.E PARK, NC 2771 1 AIR DIVISION ·. U.S; EPA, REGION ·9 

### OOT-18 MEMORANDUM· 

### SUBJECT: TO: Regional Office AirDivision Directors OFFICJ! 01' AIR· OUAUT'f PlANNING .., ANOSTAtmAAos . 

# ..

Thepurpose oftbis memorandum is to provide guidance 

### pn !Wesignating..

**~ ~oxide**  (802) nonattaimi:Jent areas to attainment, 

### in cases where the areas' historic violations were ' caused 

### by inajor point.sources .ofsulfur oxide (SOx) emissiops that are 

### no Io11ger 

### irJ. operation. States in some cases have, with our approval, removed 802 monitors frqm these areas immediately 

### following the shutdown of the SOx 

### e.m.issions sources.. In these 

### tasi:s, states face the·prospect ofcontinued nonattirinmentdesigqations·

### for areas where there is ho reas9nable basis for

**as~g** that S02 violations persist.

. . This.gmrum:ce provides an approach for



### redesi~g 

## 'tl:ese

**~~to** atta'inment. in.tbe absence ofmonitbring data and for exetnpting tbe.Se are:i$ 

# from tbe maintenance plan · . 

### . requirements for conrlnuedmonitoring within tbe

**ar~** In addition, this policy deScribes·how

**a~ent** aild continued maintenance should be dei:nonstrated and how sources currently shUt . . . /
·.

**~·**

· davin should be treated ifthey resume·operations. Therefore, tbis policy ame.nds,portions of .

previous redes1gnation policies, including

**•'Pto~ec;!t:q"es** for

**PrOc~sing** 

### Requests to.Redesignate · ..

.Areas to Aruiininent,

**~memo** from iohn Caicagni, AQMD Director, 

### dated· 9/4/92;· "Section

## 'i'o7 . . Desigpation Policy 

### siimmary,"

**m~o** from Sheldmi

### Meyers,

**OAQPS-DirectOt~** dli,ted 4121/83, . 

### ·?

per(hlning to

**amb~ent** 

### air quiilitj data shomng aitainment and maintenance 

### ofthe S02National-· · Ambient 

### Air Quality

**Standar~s** (NMQS);

**ani:!.~**Attainment Deiennination Policy for Sulfur . . Dioxide Nonattain!nent Areas;" memo ·frpm Sally L. Shaver, AQSSDDirector, dated 1/26/95..

All·otberpro:visions of

### the previous redesignation policies 

## still apply, incltidfug provisions reJating to contingency meilsures. · .. . · . . . . · · . ' ·

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. The Environmental Protection Agency's (EP A)·historic

**redisi~ation** policy for 802 has called-:for 8 quarters ofclean ambient air. quality data for redesignation, to iiittainment. ,'\lthough · EPA has allowed as few as 4 quarters ofambient data if

# an acceptable modeling analysis has been performed.' Areas that lack S02 monitors cannot meet. even the requirement for 4· quarters . ofclean·data.· However, EPA believes that itis not a reasonable use oflliirited monitoring resouxces to recistablish.monitors in ord.er to collect at least. 4 quarters ofdata.in areas where violations ofthe S02 NAAQS were caused by souxces that no longer operate. b.espite the absence ofclean 

### ii.ir quality·data, EPA believes ·that itmay approve aState's request to .redesignate such. S02 nonattainment areas to attirlnment

**provid~** that the State submits a maintenance plan that addresses 

# certain criteria. . First, the plan should include 3 emissions inventories: (a) An inventory representing actual emissions during the period·when there were· violations ofthe S02NAAQS; (b) An inventory representing current actual and allowable emissions (or potential emissions, if there is no allowable emissions

**l~vel);** and (c) An inventory projecting allowable emissions (orpotential emissions, ifihere is no allowable emissions level) to the 1Oth year after redesignation. '.(he inventories should display emissions from each poult source ofSOx, with explanations



### ~f significant emissions changes, including source shutdoWr!s.2 The inventories should include SOx emissions

**fr<~m** alf SOx point sources in; and within a 50 kilometer range of, the nonattainment area boundary..Again, ifthere is no allowable emissions level, potential emissions should be used. · · . Second, the maintenance plan should u;clude



### ~ dispersion·modeling anaJysis: 6f

# ausox:· · point sources in, !ij]d within 

### SO kilometers of, the nonattainment area boundanc;s using the emissions inventories described above. and the

**tec~ques** and dataprescribed in 40-CFR 51 Appendix W. The modeling.analysis should sliow that: · 'See the Meyers memq referenced above. Both the Meyers and Calcagni memos recoglrize that for S02 nonattainment areas monitoring data alone may not be su:f!icientfor redesignating areaS to attainment; dispersion modeling may be needed. 2 The inventories should include other sources 

### if they were included 

### inthe attainment dempnstration. · · · ·. (a) (b) 

### 3 No S02 NAAQS violations**pres~y** occur 

### Or caii.be projected·to occur dUring the next I

### 0years**imywh~e** 

## mtlllll the nonattainment area;.and, . .
. ! • • • • • • •' • Point sources, which have since shut down, were**th~** dominant souii:es contributing to high S02 concentrations in the airshed.**~-** Third, the mainteQance plan should include evidc;nce that ifthe**S~** point source that caused the S02 NAAQS violations in the past resumes operation, it-would

# pe ·co!lSidered 

# a . "new'' source.. 'fhus the maintenance plan should show that ifthis ''ilew" 

# sox source w!lWd be a major source, it should obtain 

## a permit conforining to applicable:requh:ements.

# ofthe Prevention ofSignificant Deterioration program**b~:(ore** resuming operation:i; or ifit would not be a major . · source, it should obtain 

# a imnor spurce permit under .the.State's SIP-approved minor source permitting rules in effect at the time 

### it"obtains a.permit,:before itmay resume operation. The
. maintenance plan should·provide that before such a permit is issued, the dispersion model should be re-run, using the same meteorological data base, to determine whetherre-Starting. the source would 'interfere withmaintenance, and should provide that the permit will not be issued ifthe model indicates that re-starting the source would interfere withmaintenance.· ··

. : _, Fourth,

## th~ maintenan6e plan should include commitments to.resurre ambient monitoring before any major source .ofSOx emissions co=ences operation.**··~1**

.,, .**~** . ··.fl . • ••••,t 

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### .. · .. -Tli:is

### p~licy applies:only.to S02

### nona~ent areas because viofailons in such 

# areas are g<jnerally dominated by relatively few point ·sources (sucli as cOpper**smelt~rs** orpower plants) arid have insignificant: area and mobile source emission coni:ributions. As:

### it result, there is a direct association between the point sources' emissions' and ambient S02 c-oncentrations. Disper-Sion modelfug will assure that S02 NAAQS violations are no longer occUIJ;ing and wo)ild notbe expected te recur in the 

## future. · . '·"; 

### .. . ......... ·::. 

## .-- This gUidance memorandum does not impose binding,

### enforceab1e~~q$ments on any · party, and inay not apply·to a particular situation based upon the circumstances. The EPA r¢tains**th~.** cjiscretion to adopt'approaches to addressing maintenance plan proViSionS that differ from this ,: . · .. ··'gtlidance where appropriate•. Any final decisions by

## EPA regarding;a**partic~ar** 802 · . :, . : ' maintenance plan will only.be made. in the context ofa rulemaking. action

## regarding that · mainteruince plan based upon the applicable statUtory and regulatory provisions, which do contain, legally·binding reql)irements. Therefore, interested parties, including States, are free to .· 'Iai,se questions and objections' about the appropriateness 

# ofthis guidance or the app.iicati<;Jn of



## this guidimce to a particular situation; 

### EPA will consider whether ornot the recommendations in the guidance

# are appropriate inthat situation. The EPA welcomes publiG**~omnients** on

### J:!ris .. document at any time and will consi!ler those comments in any future revision ofthis guidance doctiment, which may occur withoUt public notice. · 

## .. ,.**-~** . ·. 

### 4 . I urge Regions to 

### coordinateclos~ly with OAQPS' 

### Air Quality



### ~tandards and Strategies .Division 

### in detemiining-whether S02 redesignation requests may be subject to this policy and to ensure.that States' submissions adequately address this and the·preVious

**polici~s'** 

### critena for redesignating 802 nomittainment areas to attainment · · cc: Lydia Wegman, AQSSD **·.:::~:·**

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### David Mobley, EMAD f 

### ·Joe Paisie; IPSG 1 1 .!{ich 

### Ossias, OGC. 

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