3"iîlïiJ#åtr;å::lÏ*'Rcsources 'cr ¿? ¿01¿ 655 S. Bay Road, Suite 5N

Dover, Delawa¡e 19901

Dear Mr. Mirzakhalili:

Thank you for giving the U.S. Environmental Protection Agency (EPA) the opportunity

to review the proposed "Delaware Redesignation Request and Maintenance Plan Under the 1997A¡nual Plvfz.s Nationai Ambient Air Quality stândard; state Implementation Plan; For the Newcastle county Portion of the Philadeþia-wilmington, PA-NJ-DE Nonatlainment A¡ea for Fine

Paficles" and .,Delaware Redesignation Request and Maintonancc Plan Under the 2006 DailyPÀ¡tz.s National Ambient Air Quality Standard State lmplementåtion Plan For the New CastlcCounty Portion of the Philadelphia-Wilmington, PA-NJ-D. E Nonatt¿inment Arca fqr Fine

Particies." EPA has reviewed the 1wo proposed redesignation requests and maintenance plansOur comments are enclosed.

Please ente¡ these comments into the public record. We look forward to working with

you to resolve these comments. Should you have any questions portaining to EPA's teview ofDelaware's proposed redesignation requests and maintenance plans, please do not hesitate tocontact me. If members of your staff have questions, they may direct them to Ms. Maria A. Pino

at (215) 814-2181.

;;i;*& Dia¡a Esher, Director

Air Protection Division

Enclosuresti Prtnted on 100% reclcled/recyclùble papef vlrh 10096 posl-consamer fiber and process chlo nelree

Customer Semlce lIollìne: 1-800-138-2474
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Requirsmeplsi,5,2 Delaware Âoproaeh

"D"1"**" *b-i1ed itñnual ptr¿r 5 attainment demonstration to EPA on April 5, 2008.It was subsequently revised ø update onroad mobile emissions based on the MovEs

model, and s;bmitied to SpA on ÀAay 3, 2012. EPA has not completed rulemaking on the2008 SIP or ttre May 3, 2012 Revision to the 2008 PMz s SIP' However' EPA Rgeio-n 3has tecently inforrned DAQ that they have a Consent Decree which requires final aotionon Delaware's attainment plan in Deæmbet 2012."

C, ommgnt: The consent decree has been modified and tho date by which EPA is required to ö-plõluf"-uti"g on Delaware's attairrment demonst¡ation ftrtle 1997 annual PMz s

sønåard has been rJvised to Ma¡ch 29,2013. However, EPA is working expeditiously on this

rulemaking, and anticipates tÏat it will be compete before Ma¡ch 2013'2l Proposed Plan: 8.2.3 Contiol Meåsu¡:es for' Maintenâncé:of G.óod Alr Qualitv liniddlg- pf

oase 47\

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8-7 shows the reduction due to controls and the control measure by source

sector."

Conment: Please replace "Table 8-7" with *Table 8-6"

3) Prouosed Flaru 8.2,3 Conhot Measures for Maintenancç of Good Air Oqglltv

"T"bl" 8ó P"tiZoOZ Emission neductions due to Control Me¿swes"

comment: Please give the time period during which thesç reductions a¡e achieved ' i.s.'2007

until 2025.

4) lropo¡ed Plan: 1 0 Continsencl¿ Moêsurosì ¡ 0;2 Delaware APoroach: 1' Warning L&velResDonse

--- 

u- A *uming level response shall be prompted whenever the annual PM2.5 concentationof 15. I pgl# o, gt*i", o""urc in a single calendar year within the Philadelphia

maintenance area.

comment: Please specifi that the waming level response will be tiggered whenever an armual^"!LPW t concenlation of 15.1 ¡rglm3 or greater occurs in a single calendar yoa,r g!s!!y monllorinz síte within Philadelphia maintsnanoe area.
Comment: Please spccify that a¡ aclion lcvcl rcsponse will bc triggered whenever a two-year

averagc oftle arnual nuan PMt.s concentration of I 5.1 pglln3 or greâler occurs in a singie

calendar year al anv monílorìne síle within Philadelphia maintenzurce a¡ea.

6) P.roposed Plan; l0 Conti¡qsnclr' Measurss: 10.2 Dolaware Aoproach: 3. Study and data

analysis

"Based on the results ofthe analysis, contingency measures will be selected from those

listed below, or from any other measure deemed appropriate and cffcctive at the time theselection is made. However, ifa new measure or conlrol is already promulgated and

scheduled to be implemented at the federal or state level at such time after the

exceedance, and that measu¡e or conhol is determined to be sufficient to address the

upward trend in air qualíty, additional local measures may be unÌiecessary. The selection

between measutcs will be based upon cost-effectiveness, emissions reduction potential,ease and timing of implementation, and other appropriate factors."

Comment: Please ensure tlrat Delawa¡e shares the results of its study with EpA, especially if

Delawa¡e determines that no contingency measures will be triggered. EPA suggests inserting thefollowing languagc. únehwûry H,tll subrnl! la.PPA,øn arrûlttîìi to ¡letnansqøte le ir.Op4set! tfl1arsufts t ìe

adeauate lo return ihø øreø lo øltaínmcnt,,,

7) Propose.d Plan: l0 Co¡tl4gcnc). Meæures: 10.2 Dçlawa¡c Aporoach: 3. Studv ahd dara

analysis: Tabie I0-l Schedule for Pennit Rcvisions or Rule Reviiions for Contlneencv

Measu¡es: footnote 2l

. "This schedule initiates with certification of ambient air quality monitoring data

indicating a violation of the 1997 annual PMz5 NAAeS."

Comment: A¡ action level response is triggered by a violation as well as when a two-year

average of the amual PM2.5 concentration is 15.1 pglmr or greater. Foôhote 2l should be

revised to rcflect tbat.
EPA itrf

.,I Delawa¡e Division of Air Quaiity (

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Rulemaking to be proposed in the Fedoral Regist'er by December 14,2012;'

Comment: EPA proposed the determination of attainment or "clean data determination". (CDD)

f* rft" ZOOO *Ilìuul Þtt¡r, sta¡dard fo¡ the Philadelphia-Wihnington, PA-NJ-DE nonatlainmentarea on October 2, 2012 (77 FR 60089).

2) Proposed !lan: 4.2.1 Eoonomic"Conditions

"Th" GDP in evety y"* bet*een 2008 ærd 20l l is gleater th4n evory year befween 2006

¿¡d 2008."

Çommpnt: Gross domestic product (GPD) in every year betweøn 2009 and 201 1 is greater thanevery year between 2006 and 2008."

3) Proposed.Plan: 5.,3 Pa¡t D Plan Reouirements,for NgnattaùmeÂti,reas in Geno¡al ÎI"*e"-, the base year inventory requirement under 172(oX3) is not suspended'

Delarva¡e will r.nçet ihis requirement when EPá fir1ly approvos the 2007 base year --- .

inventory submitted wilt fhis daily PMz s NAAQS redesignation'agd maintenance SIP."

Comment: The inventory required under Clea¡r Air Act section 172(a)(3) musl be. a.*.p.eñõrirn", accurate, and current invontory. Delaware should bc ¿w¿re that it has tho

optiôn of subrnitting its 2008 inventory to meet thç require¡ients of seôtions 172(c)(3)^

"Reductions are shown in Table 8-7."

Commenl Please replace "Table 8-7" with "Table 8-6"l) P¡oposed Plan: 8,2.3 Conlrol Measu¡es for Maintena¡rce of Good Air Ouglitv

"Table 8-6 Post-2008 Emission Reductions due to Control Measures"

comment: Please give the time period during which these reduotions a¡e achievod, i.e., 2008

until2025.
7) Pr9pose4 PIan: l0 Contingoncv Mea.sures: 10.2 Delewaró ,¿loproachl I . Warnine Level

Resoonse: 2. Action lævel Response

"An action lcvcl lesponse shall be prompted wltenev^er a two-year average ofthe 98th

percentile 24-hour PM2.5 concentrâtion of 35.5 pg/m' or greater occurs within the

Philadelphia maintenance area."

Comment: Please speciS that an action level response will be triggered -whenever a two-yearaverage ofthe 98th percentile 24-hour PM2.s concentration of 35.5 ¡rg/mr or grcater occurs al

anv moniloring s¡&within the Philadelphia maintenance area.

8) Pronosed Planl l0 Continqenoy Moâsurçs: | 0.2 DelewaÍt Apnroaoh: 3. Studv and data

analvsis

"Based on the ¡esults of the analysis, contingency measu¡es will be selected from those

.listed below, or from any other measure deemed appropriate and effective at the time thc

seleotion is made. However, ifa new measure or control is aheady promulgated and

scheduled to be implemented at the federal or state level at such time afler the

exceedance, and that measu¡e or cont¡ol is determined to be sufficient to address theupward trend in air quality, additional [oca] measures may be unnecessary."

Comment: Please ensure that Delaware shares the results of its study with EPA, especially if

Delaware determines that no contingency measures will be triggered. EPA suggests inserting thefollowing language.

"Delawar¿ will submí¡ lo EPA an anqlvsv lo ¡lerrro4strate lhe pronosed megsures øre

odcquale to rclurn the ãrco lo øltdlnmenl"

Measures: footnote 24

"This schedule initiates with certification of ambient air quality monitoring data

indicating a violation of the 2006 24-hour PM2.s NAAQS."

CoI4{nen!. An action level response is figgered by a violation as well a-s when a two-year

average ofthe 98th percentile 24-hour Plrdz s concentration is 35.5 ¡rg/m' or greater. Footnote 24should be revised to reflect tlat.