# or-' 

# -y MontanaDepartmentof ' 

# ENVIDRONMENTALQlJAUTY 

# 8- P

Brian Schweitzer, Governor RichardH. Opper, Director

P.O. Box 200901 • Helena, MT 59620-0901 • (406) 444-2544 • www.deq.mt.gov July 13, 2011

James B. Martin Regional Administrator United States Environmental Protection Agency Region VIII, 8P-AR 1595Wynkoop St. Denver, CO 80202-1129

Re: Montana Carbon Monoxide Limited Maintena.nce Plan Revisions and AlternativeMonitoring Strategy

Dear Mr. Martin:

Montana is sUbmitting revisions to the State Implementation Plan. This submission containsthe updated second 10-yearterm Great Falls and Billings carbon monoxide (CO) Limited Maintenance Plans (LMP) as required by 42 USC 7505(a). This submission also fulfills the criteria setforth in 40 CFR Part 51, Appendix V.

In addition, Montana is proposing changes to the monitoring strategy currently deployed underthe subject LMPs. As you are aware, ambient levels ofCO in Montana and nationwide have decreased precipitously, mostly dueto federal tailpipe standards and vehicle fleetturnover. Accordingly, the amount ofstate and local resources necessaryto continually confirm trace levels ofCO no longerjustifiesthe exhaustive and resource intensive use ofgaseous CO analyzersfor such purposes.

Montana is interested in ensuring that the affected LMP areas maintain compliance with the national ambient air quality standards despite decreasing federal grant support. To that end, Montana developed and proposes to use an alternative CO monitoring methodology described in the enclosure titled "State of Montana Alternative CO Monitoring Strategy." Montana intends to deploythis revised CO monitoring strategy as ofOctober 1, 2011.

Ifyou have any questions regarding this action, please contact the Department'sAirQuality Policy and Planning supervisor, M. Eric Merchant, by telephone at (406) 444-1457 or by email at emerchant@mt.gov.
Sincerely,

d

# /~-**~/**

# 'i-l**~:C-.-J** Richard H. Opper Director

Enclosure c: Dave Klemp, Chief, Air Resources Management Bureau M. Eric Merchant, Air Resources Management Bureau RECEIVED U.S. EPA Region 8 c/enc: Brian Schweitzer, Governor RA's Office 

## ,'" 20 "-'1 ,JUL LUI

Enforcement Division • Permitting & Compliance Division • Planning. Prevention &Assistanee Division • Remediation Division

## State of Montana Alternative CO Monitoring Strategy
Surrogate

# co Monitoring Method

Montana proposes revisions to the existing carbon monoxide (CO) Limited Maintenance Plans (LMPs) to adopt reproducible CO monitoring methodswhich do not utilize a traditional gaseous analyzerfor determining CO NAAQS compliance in the CO maintenance areas of Billings, Great Falls and Missoula. The surrogate CO monitoring method will include an annual. review ofthe trafficvolumes in each ofthe CO maintenance areas using the data from the Montana Departmentof**Transportation~s** (MDT) permanent automatictraffic recorders (ATR) in Billings, Great Falls, and Missoula.

The Montana Department of Environmental Quality (Department)will compare the latest rolling 3-year monthly average of the average daily traffic (ADT)volumes during thetraditional high CO concentratio[l season of Novemberthrough Februaryagainstthe baseline ADT average forthose months established by the ATR data collected during 2008-2010. Contingency Plan

Ifthe ADT increases by greaterthan 25%when comparing the most recent, consecutive rolling 3-year period tothe baseline2008-2010 period, then the Departmentwill conducta CO saturation study using portable, non-reference samplersto determinethe actual CO levels in the ambient air nearthe formerambientair monitoring site. The CO screening study will be conducted the following winter duringthe Novemberto February period and the results evaluated to determine iftraditional CO monitoring with a gaseous analyzershould resume in the subject community.

Ifthe percent increase is notgreaterthan 25%, then the ambientCO concentrationswill be presumed to have remained relatively unchanged.
Annual ADT comparison Analysis

The baselinetrafficvolume levels for Billings, Great Falls and Missoula were established using thefollowing data sets: Rolling 2008-2010 Average Monthly ATR Traffic Volume During Novemberto February Month-Year Billings (#A-050) Great Falls (#A-033) Missoula (#A-Q31) January2008 32,778 34123 19413 February 2008 35463 36,855 20568 November2008 35,832 35,675 20,366 December2008 32042 33584 19,030

January 2009 33256 33,820 18,005 February 2009 35695 36,102 no data November2009 37,121 37110 20,242 December2009 33905 34,742 19825

January2010 32,340 34,371 20,155 February 2010 34,317 36576 21 056 November2010 33885 34,164 20349 December2010 34,317 34,691 19,599 Average 34,246 35,151 19,813

The baseline traffic volumesforthe 2008to 2010 time period, by community, are as follows:

• Billings 34,246
• Great Falls 35,151
• Missoula 19,873

Forexample, in early 2012, using the ATR data from 2011, new rolling averageswill be calculated forthe 2009to 2011 time period for each community. That new rolling average for 2009-2011 will becompared to the baseline 2008-2010 average for each community. TheADT data review process will be repeated each year during the annual monitoring review and the new rolling 3-year average will be compared to the baseline averagefrom 2008-2010.

# RECORD

State Implementation Plan Notice and Comment Process For Great Falls and Billings CO Limited Maintenance Plan

TABLE OF CONTENTS
(1) Public notice statement. (2) Proof of notice to Interested Parties 

## &APCAC (list of parties attached) (3) Notice as published on DEQ website (4) Public cornments (5) Great Falls Carbon Monoxide Limited Maintenance Plan (6) Billings Carbon Monoxide Limited Maintenance Plan

Prepared by: Date:

### PUBLIC NOTICE Great Falls and Billings Carbon Monoxide Limited Maintenance Plans 1) The Department of Environmental Quality is inviting public comment on the proposed submission of revisions to the Great Falls Carbon Monoxide Limited Maintenance Plan and the Billings Carbon Monoxide Limited Maintenance Plan into the Montana State Implementation Plan (SIP). 2) Any person may request public hearing on this matter. Ifthe Department receives a request for public hearing, a public hearing on this matterwill be scheduled and the time for that hearing will be announced and another 30 day time period for submitting commentwill begin. 5) Interested persons mayview the Plans on the Department's website at: http://deq.mt.gov/pubcom.mcpx or may call the Department at406-444-7916 to have copies made available fortheir inspection. 6) The State of Montana makes reasonable accommodationsfor any known disabilitythat may interfere with a person's abilityto participate in state government proceedings. Persons needing accommodation must contact Oline Barta to advise ofthe nature ofthe accommodation needed. Please contact Ms. Barta at P.O. Box 200901, Helena, Montana 59620-0901; phone (406) 444-0524; fax (406) 444-1499; oremail "obarta@mt.gov." 7) Interested parties may submittheir comments concerning the proposal described above in writing to the Department by
• addressing them to Oline Barta, 1520 E. Sixth Avenue, P.O. Box 200901, 

### Helena, Montana, 59620-0901;
• faxing them to (406) 444-1499; or • sending them via email addressed to "obarta@mt.gov." To be guaranteed consideration, written comments must be postmarked on or before 5 p.m. May 23,2011.

# =1'" 

# "f MontanaDepartmentof 

# ENVJ(RONMENTAILQUAL[TY Brian Schweitzer, Governor

P.O. Box 20090I • Helena, MT 59620-0901 • (406) 444-2544 • www.deq.mLgov

DATE: April 20, 2011

TO: Air Interested Parties

FROM: Montana Department of Environmental Quality Air Resources Management Bureau

RE: Public Comment on SIP Submission

PUBLIC NOTICE Great Falls and Billings Carbon Monoxide Limited Maintenance Plans 1) The Department of Environmental Quality is inviting public comment on the proposed submission of revisions to the Great Falls Carbon Monoxide Limited Maintenance Plan and the Billings Carbon Monoxide Limited Maintenance Plan intothe Montana State Implementation Plan (SIP).
2) Any person may request public hearing on this matter. Ifthe Department receives a request for public hearing, a public hearing on this matterwill be scheduled and the time forthat hearing will be announced and another 30 day time period forsubmitting commentwill begin. 5) Interested persons may view the Plans on the Department's website at: http://deq.mt.gov/pubcom.mcpx or may call the Department at406-444-7916 to have copies made available fortheir inspection. 6) The State of Montana makes reasonable accommodationsfor any known disability that may interferewith a person's ability to participate in state government proceedings. Persons needing accommodation must contact Oline Barta to advise ofthe nature ofthe accommodation needed. Please contact Ms. Barta at P.O. Box 200901, Helena, Montana 59620-0901; phone (406) 444-0524; fax (406) 444-1499; oremail "obarta@mt.gov." 7) Interested parties may submittheir comments concerning the proposal described above in writing to the Department by
• addressing them to Oline Barta, 1520 E. Sixth Avenue, P.O. Box 200901, Helena, Montana, 59620-0901;
• faxing them to (406) 444-1499; or • sending them via email addressed to "obarta@mt.gov." To be guaranteed consideration, written comments must be postmarked on or before 5 p.m. May 23,2011.

Enforcement Division • Permitting**"'~** Compliance Division • Planningt Prevention &**AssistanCl~** Division • Rcmcdhltion DivisionAir Interested Parties Mailing

EmailAddr 2horses@nemontel.net Sfriendlyfish@bresnan.net Abbie.Krebsbach@mdu.com aclark27@bloomberg.net adam.poll@tetratech.com aday@trinityconsultants.com afanderson@fsJed.us ahedges@meic.org alexanderrr@cdm.com allen@allen-associatesmt.com andrea.perez@hexion.com apack@aIl4inc.com astecpermits@gmail.com aussie_northcott@hotmail.com azzie_301@hotmail.com bayxie@aol.com bdhohn@hohneng.com bdundas@truecos.com beamman60S6@msn.com benjamin.recker@tetratech.com berrysoup@yahoo.com beth_dickerson@fws.gov bettylu@blackfoot.net bhabeck@mt.gov bholland@crowleylaw.com bjohnson@summite.com blaise.leblanc@hotmail.com blakecrk@gmail.com bml@stateside.com bmontgomery@montana-wcc.com bob.vantuyl@ashgrove.com boschleicher@mt.gov bret@bison-eng.com brett@bison-eng.com brian.mchugh@tetratech.com brian.zieske@malmstrom.af.mil brianna@clarkfork.org brogers@newfield.com Bruce.Krepley@naes.com bschmidt@co.missoula.mt.us bsoamj@3rivers.net BSquires@nicnd.com Bstevenson@rosipower.com bsublasky@emsl.com 20-Apr-ll

FullName_ Debbie Madison Jack &Pamela Emard Abbie Krebsbach Aaron Clark Adam Poll Aaron Day Anna Anderson Anne Hedges Bob Alexander Don Allen Andrea Amy Pack Catherine robert k eddy Brian Hohn Bob Dundas Anderson Ben Recker bonita beth dickerson Jim Young Bob Habeck B.Holland Bruce Johnson

Krista Evans Becky Lukaesko Bob Montgomery Bob Vantuyl Bob Schleicher Bret Gallo BrettGallo Brian McHugh Brian Zieske Brianna Randall Brad Rogers Bruce Krepley Ben Schmidt MaryJane McGarity Bruce Squires Bruce Stevenson YELp· benbullorj@bp.com burns.betsy@epa.gov bvaughn@montana.com c2nites2000@yahoo.com calvin.e.kidney@wellsfargo.com

carl@compliancefreaks.com cartoonsmart@mac.com cash1230@esaphaseone.com cathyl@bkbh.com cboe@mt.gov cefarms@tetonwireless.net cflanders@nobleenergyinc.com chalbert@landauinc.com chenine.wozniak@ch2m.com cheryllynned@marathonoil.com chomer@mt.gov chuck.buus@riotinto.com chuck@netentrust.com chuckp@cskt.org cindy_buschman @mccormick.com cindymed@hotmail.com c1aseur@plainsjustice.org cmhd@midrivers.com cmrcd@midrivers.com coate.carson@epa.gov colburnm@ho.missoula.mt.us coolnickjr@hotmail.com coupscounter@yahoo.com cpowell@buysandassociates.com cpowell@ltenv.com cranecreationsl@yahoo.com crose@3rivers.net crwindmueller@wtrconsulting.com dan.corti@mso.umt.edu darrell.soyars@avistacorp.com daveduttonfraser@yahoo.com davew@kirkwoodcompanies.com david_long@eogresources.com dblank@ncpa.org dbusby@montanarefining.com dcowan@mt.gov dcquickdraw@gmail.com debbies_design@yahoo.com detroit03mm@yahoo.com dhart@cleanair.com dhrubes@midrivers.com diannalin@msn.com Robin Bullock Betsy Burns Barbara Vaughn Kermit Snow Calvin Kidney Carl Williams Buddy Rogers John Meyers Cathy Laughner Chris Boe Chad Dohney Catherine Flanders Chip Halbert Chenine Wozniak Cheryl-Lynne Davis -Marathon Oil Charles Homer Charles D. Buus chuck Chuck Page Cindy Buschman Cindy Carrie La Seur Mike Rinaldi MontyL. Sealey Carson Coate MamieColburn randy lahey David saylor Chad Powell Chad Powell Julia Crane Corrine Rose C. Ray Windmueller Dan Corti Darrell Soyars dave Dave David Long Danielle Blank Dexter Busby Devin Cowan Devin Cowan Debra Vetter Mike Dean Hart David Hrubes Dianna Lintnerdjohnsonhorne@barrick.com dlambrecht@jbrenv.com dlorenzen@pioneer-technical.com dmunson@mt.gov dmyran@montana-wcc.com doIan.kathy@epa.gov donald.may@tetratech.com dpaulsen@ala-nr.org dpavuk@crowleylaw.com dpowers@summite.com drusoff@mt.gov dshonerd@multistate.com dsimonson@mt.gov dsimpson@montana-wcc.com dsoehren@bresnan.net dsorensen@bozeman.net dugiejm@hotmail.com dujohnson@mt.gov dvanhyningl@msn.com dwalsh@mt.gov dwatson@rosebudcountymt.com dwolfe@mt.gov ed@mt.net edmadler@hotmail.com edward.hookl@montana.edu eemc@bresnan.net eisele.adam@epa.gov elbrunner@gmail.com emcrae@fageninc.com emerchant@mt.gov

emilieboyles@yahoo.com eric.detmer@cldpk.com esa@platts.com fcrowley@doneylaw.com fotto@ups.com frank@shumaker.psemail.com gabe.johnson@riotinto.com gaila_consulting@msn.com gcm@sierraresearch.com geraldschlosser@benefis.org gjackson@emittechnologies.com gjg@ecocion.com gmcgann@co.carbon.mt.us Greg.brown@chsinc.com greg.hildebrand@ttemi.com grey_nicolls@hotmail.com grodway@bison-eng.com DeborahJohnson-Horne David Lambrecht Diane Lorenzen Darren Munson Darrel Myran

Don May Dick Paulsen D.Pavuk Dan Powers Dave Rusoff David Shonerd Dave Simonson Dave Simpson Doug Soehren Dewey Sorensen Jeff Dusti Dyrck Van Hyning Dan Walsh Daniel D. Watson Deb Wolfe Ed Santos Edward Madler

- APCAC ej hook Dave Wang Adam Eisele Erica Brunner Edward McRae Eric Merchant emilie boyles Eric Detmer Esa Frank Crowley Friedheim Otto frank GabeJohnson Gail Abercrombie Gabe McAuliffe Gerald Schlosser GaryJackson Gary Gates Gregory McGann Greg Brown Greg Hildebrand robert Grant Rodwayhbedbury@montanarefining.com hestmark.martin@epa.gov hhsgreengroup@gmail.com hkaiser@hydrometrics.com hpeterson@mtech.edu hrash@mt.gov hrobbins@bison-eng.com info@kakuk.com info@lion.com info@northernplains.org j.castro@cLburbank.ca.us Jackie.Flikkema@Kniferiver.com jacl<ross@nemontel.net jade.stokke@riotinto.com Hadley Bedbury Martin Hestmark HHS Green Group Heidi Kaiser Holly Peterson Hoby Rash Hal Robbins Michael Kakuk Lion Technologies Northern Plains Resource Council Jessica Jackie Flikkema Jack Ross Jade Stokke Jagadeesan.Sethuraman@whiting.corJagadeesan Sethuraman jahughes@mt.gov jajehn@marathonoil.com jake.weirich@edaw.com jakenny@mt.gov jamie.christopher@aecom.com jamie.gaboriau@riotinto.com jamiew@slservices.net JasMatthews@msn.com javid@mod2.com jcarlin@mt.gov jcarlson@co.missoula.mt.us jchaffee@bison-eng.com jcoefield@mt.gov jdorris@mt.gov jean.semborski@conocophillips.com jeannehallesy@yahoo.com jeff.briggs@ashgrove.com jeff@ajaxcomputernetworking.com Jenna_k_02@hotmail.com jennifer.cinq-mars@ang.af.mil jennifer.pin@riverstonehealth.org jennifergoldman@ogap.org jenomara@mt.gov jfdowns@babcock.com jford2@mt.gov Jiakun.Zhang@stjude.org jilesejibril@yahoo.com jillgrenon@yahoo.com jjones@bwenergylaw.com jli@mt.gov jmariepatrick@3rivers.net JMBlanco@marathonoil.com Jim Hughes JohnJehn Jake Weiriich Jake Kenny Jamie Christopher jamie gaboriau Jamie Whiteman James Matthews, M.D. Javid Nia Jim Carlin Jim Carlson JeffChaffee John Coefield Joshua Dorris Jean Semborski Jeanne Jeff Briggs Jeff Jenna Loring Jen Jennifer Pinnow JenniferGoldman Jenny O'Mara John Downs McCloud (Joe) Ford Jiakun Zhang Jilese jill grenon juliajones Janet Li June Patrick Julius Blancojmerkel@mt.gov Julie Merkel jmparker@pplweb.com Jim Parker Joe@shumaker.psemail.com Joe Aline JOELKelm@msn.com Joel Kelm John@SenatorJohn.net John Brueggman johnJei@ibew.org John Lei

-APCAC jon.madison@mdu.com Jon madison jonnysanty@gmail.com Jonny Santy joseph.w.lierow@exxonmobil.com Joe Lierow josephfdepaz@yahoo.com Joseph F. de Paz jrussell@flathead.mt.gov Joe Russell jscott@cherrycreekradio.com Jay Scott jsites@crowleylaw.com J. Sites jugorowski@mt.gov Joe Ugorowski Kalle.Kuether@mdu.com Kalle Kuether· karen@netentrust.com karen katrina_winborn@urscorp.com Katrina Winborn kdavid@flathead.mt.gov Kelly David kenre@comcast.net Kenneth Reeves Kevin.Pilger@taqa.ca Kevin Pilger kgehret@perkinscoie.com Kate Gehret kgessaman@mt.gov Kathy Gessaman khooper@libby.org Kathy Hooper kirstLgilmour@hotmail.com Kirsty Gilmour kmoore@co.lewis-c1ark.mt.us Kathy Moore korr@mt.gov Katherine Orr krandall@fvcc.edu Katie Randall krobertson@mjbradley.com KRobertson ksolberg@anacondadeerlodge.mt.go\ Karen Solberg kwalsh@enviroconsult.com Kevin Walsh kwebb@m-m.net Kristi Webb larry@montanasulphur.com LarryZink Iclark@fsJed.us Lori Clark leah.bennett@rocketmail.com Leah Bennett lee@prrlaw.com Lee Bruner lepodal@yahoo.com Debbie Lepo LGlatz@mt.gov Glatz, Linda Ihendley@co.lewis-c1ark.mt.us LHendley Iibrary@crowleylaw.com Crowley Law Iindsay.spurlock@riotinto.com Lindsay Spurlock Iisasandoval@contres.com Lisa Sandoval Ijordan@rc.mt.gov Lea Jordan Ikambham@trinityconsultants.com Latha kambham lIaknar@co.beaverhead.mt.us Laknar lIoken@wpcnd.com Lance Loken Imoody@all-lIc.com Lee Moody Imoral@trinityconsultants.com Lani Moral rInguyen@trinityconsultants.com lonnie.fallin@jacobs.com Istuder@stmaryland.com Iweeks@nemont.net Izanto@mt.gov macka_maka@hotmail.com marcellama@cskt.org Margaret.Zebley@aecom.com

margaret@montanasulphur.com mark.lin@gmail.com mark@aspence.net markschaffer57@hotmail.com mary.blel@chsinc.com mbarton@co.missoula.mt.us

mbasta@greatfallsmt.net

mbayne@abraxaslusk.com mbrown@ap.org mcferrins@mt.net megan.siems@sierraclub.org mhillman@trinityconsultants.com mhoffman@jeffco.mt.gov michelle@skyride.net mike.simpson2009@gmail.com miosh_com@yahoo.com MitcheII.Leu@plumcreek.com mlct@mt.net mmca@mttrucking.org montanabobcat@gmail.com mpa@montanapetroJeum.org mpainter@ci.missoula.mt.us

mpontiff@newfield.com mraile@montanarefining.com mrlambrecht@pplweb.com msimonich@helenahar.com mtaudubon@mtaudubon.org muncie1929@itstriangle.com mwignot@hydrometrics.com nathon@bison-eng.com Nick.Lawyer@montana.com nickgeranios4317@msn.com nturnbuIl2@gmail.com obarta@mt.gov parker-christensen.victoria@epa.gov Parkside@bigsky.net Pat.kimmet@chsinc.com pat@crowleyconsultants.com patels3@hotmail.com Linda Nguyen Lonnie Fallin luke Linda Weeks Lynn Zanto robert Marcella Mahseelah MargaretZebley Margaret Mark MarkC. Peterson mark schaffer Mary Blel Michael Barton Martin Basta Marc Bayne Matt Brown Felecity McFerrins Megan Siems Melissa Hillman Michael G. Hoffman II michelle Hartly Mike Simpson Ken Liston Mitchell Leu Alec Hansen Montana Motorcarriers Bob Dave Galt Michaell. Painter Mike Pontiff Mike Raile Mark Lambrecht MarkSimonich Montana Audubon Muncie Morger MichaelWignot Nathon Nick Lawyer Geranios Enterprises Inc Neil Turnbull Cline Barta Victoria Parker-Christensen JenniferSwearingen Pat Kimmet Pat Crowley patelpatty@johnsonlanematerials.com pauldsherrpc@yahoo.com pcollins@crowleylaw.com phippsangela@stanleygroup.com pjsimonich@pplweb.com pkukay@hotmail.com pmckenzie@stoltzelumber.com randall.j.richert@conocophillips.com rdaniel@rc.mt.gov rdriear@centurytel.net rebecca@bison-eng.com rebecca@northernplains.org redtail47@gmail.com reed.j.marton@conocophillips.com rfink@co.carbon.mt.us rgilson@cbmainc.com rhughes@rmsmanagement.com Rick.Walsh@Northwestern.com rjeffrey@mt.gov rkenyon@cgrs.com
roark@imt.net

ron.hyatte@riotinto.com ronald.nadwornick@mt.usda.gov ross.whelchel@northwestern.com rr@hayfam.com

rsouthwick@gr-northern.com Runningelkcliff@aol.com russb@ycchd.org ruthjensen@transcanada.com RWeimer@stillwatermining.com sabrina_rojas@hotmail.com sabskb@gmail.com saraw@jntermountain.org sbombard@natlforests.org sbrown@aquionix.com Shannon.morgan@rosi-boise.com shatten@mt.gov sherry.bursey@anadarko.com sjohnson@co.cascade.mt.us smason@hydrometrics.com smullins@industrialinfo.com
snowakowski@mt.gov sobrien@oasisemission.com solsen@mt.gov srubino@sc.rr.com ssternberg@mt.gov Stacy.aguirre@wbip.com Patty Paul P. Collins Angela Phipps Pete Simonich Paul Kukay Paul R. McKenzie Randall Richert Rod Daniel Ralph Driear Rebecca Rebecca Fischer Jo Ellis Reed J. Marton Rodney Fink Robert Gilson Rose Hughes Rick Walsh RobertJeffrey Randy Kenyon Carol Lee-Roark Ron Hyatte Ronald Nadwornick Ross Whelchel C.E.Robertson Rich Southwick Running Elk Russ Boschee RuthJensen Randy Weimer Sabrina Scott and Sheree Bombard
sara wakefield Sheree Bombard Sean Brown Owen Orndorff-YELP Skye Hatten Sherry SandyJohnson Scott Mason Shane Mullins Sonja Nowakowski ShawnaO'Brien Sandi Olsen srubino Stan Sternberg Stacy Aguirrestellaholt@live.com Stella stephentsmith@earthlink.net Stephen T. Smith stevew@bkbh.com Steve Wade
susanalise@cox.net Susan sutherlin1971@earthlink.net Sandra Sutherlin swright@cfaluminum.com Steve Wright szehntner@mt.gov Steve Zehntner tadd.berger@erm.com Tadd Berger tdzomba@fs.fed.us Thomas Dzomba teverts@mt.gov Todd Everts thodik@centurypaving.com tiphlmiller@yahoo.com Tiphanie Keefe tjewett@NPCA.ORG Tony Jewett tkircher@stillwatermining.com Tom Kircher Todd.O'Hair@bigsky.net Todd O'Hair todd.rudolph@aecom.com Todd todg@cordite.com Tod Glenn townofalberton@blackfoot.net Diane Jodsaas tquarles@retec.com Tim Quarles traciebuhl@fs.fed.us Tracie twidboom@barr.com Tony Widboom victor.m.dugan@exxonmobil.com Victor M. Dugan videtich.callie@epa.gov Callie Videtich walkers@ci.billings.mt.us Scott Walker Wburget@peabodyenergy.com Wanda Burgett whitem@dawsoncountymail.com Mike While wildcovenants@msn.com linda Dwarak william.thompson@northwestern.cor Bill Thompson wjacobs@flathead.mt.gov Wendee Jacobs wlneumiller@pplweb.com Bill Neumiller wlreynolds@bresnan.net William Reynolds woodproducts@mt.net Ellen Engstedt woodwardjj@cdm.com Jesse Woodward wwmercer@hollandhart.com bill mercer yardleysandra@hotmail.com Sandra Yardley yoonyoung.choi@mcdean.com Yoonyoung ChoiMembers:

Bud Clinch Carol Kenney CathyAtkins Cliff Runningelk Don Potts Don Powers Erik Suffridge John Sesso Kevin Fetherston Lori Bocchino Mike Ellitt Mike Philbin Mikel Siemens Rick Larson Rick Stefanic Tim Roark William Rogers mtcoal@aol.com carolsrainbow@aol.com cathy.atkins@rma.army.mil runningelkcliff@aol.com don.potts@cfc.umt.edu dpowers@bsb.mt.gov erik.sUffridge@mt.usda.gov jsesso@bsb.mt.gov kfetherston@bna.com Ibocch@wyo.gov plessie.ellitt@usmc.mil Mike_Philbin@blm.gov mikel@rlkhydro.com ricklarson@bsb.mt.gov rick.stefanic@bia.gov Tim.Roark@gallatin.mt.gov william.rogers@deq.idaho.gov

# ~~ tf(c<O 

# //1**~/.JU' ~~£'** 

2rEPHEN BLANKENSHIP FORD**~5** LST STE 390**~CRAMENTO** CA 95814**~MES** FLANSBURG AYS LODGE POLE SCHOOLS OX 110 AYS MT 59527

ONALD GEHRKE IG SKY MINING CO

o BOX 97 OLSTRIP MT 59323

t\MMYJOHNSON NVIRONOMICS INC
o BOX 1026 IHITEHALL MT 59759

:RRY D. KNUTSON lESTTECH SUPPLY & SERVICES
o BOX 80711 ILUNGS MT 59108

,,....LTER L MCNUTT G EQUIPMENTSALES 10 12TH AVE SW IDNEY MT 59270

ILA TAYLOR C42 BOX 595 USBY MT 59016 DALE COCKRELL CHRISTENSEN MOORE COCKRELL PO BOX 7370 KALISPELL MT 59904-0370

ALAN FRONBERG GLACIER ENGINEERING PC 1241STAVE SSTE 17 GREAT FALLS MT 59401

JOHN GERHART PO BOX 283 BELT MT 59412

DICK JUNTUNEN RESOURCE MGMTASSOCIATES 259 MCCLELLAN CREEK RD CLANCY MT 59634

MICHAELJ LUCIANO FARM HARVESTING OF EUREKA PO BOX 1050 EUREKA MT 59917

JIM RAMAKER PO BOX 760 CHOTEAU MT 59422

NEIL TURNBULL PO BOX 404 BROCKTON MT 59213 BARB DOWSKI REG MANAGER QWEST EH & S 1855S FLATIRON COURT BOULDER CO 80301

PEGGY FRUIT TOWN OF BROADUS PO BOX 659 BROADUS MT 59317

LYNN HILL MSE-HKM INC PO BOX 7010 SHERIDAN WY82801

BOB KELLY INTERTEC 619 S W HIGGINS STE S MISSOULA MT 59803

JOHN MCKENNA ETS INTERNATIONAL 1401 MUNICIPAL RD NW ROANOKE VA 24012-1309

FRED STEELE CSKT TRIBAL HEALTH BOX 880 ST IGNATIUS MT 59865

GERALD WAGNER BLACKFEETTRIBAL PO BOX 2029 BROWNING MT 59417

# Public Comment Periods By 

## SubjectorProgram:

iii! Ai I' QualiN Permits DraftTMDL Reports 

### II1l Major Facility Siting (MFS) 

### II1l WaterQuality Discharge Permits 

### iii! Nutrient fIolanagement Plans

The documentslistedin the linksabovearenotincludedin the listbelow.

Downl'oad Acrobat Readertoviewthe pdf documents.

Great Falls and Billings CO Umited Maintenance Plan (LMP) Public Notice May23,2011 Montana Departmentof Environmental Quality 1520 E. 6thAvenue P.O. Box 200901 Helena, MT 59620
Billings LMP
Great Falls LMP aline Barta MT-DEQlARMB PO Box 200901**~Iena,** MT 5962.0-0901 Phone: (406) 444-0S24

Bozeman Solverlt Site Proposed Plan and Draft Final FeasibilIty Study March 29, 2011 Montana Department of Environmental Quality 1100 N Last Chance Gulch Helena, MT 59620-0901 Kate Fry Montana Department of Environmental Quality P. O. Box 200901 Helena, MT 59620-0901 Phone: (406)841-S066 Finding of No Significant Impactfor the CityOf Bozeman waterTreatment Plant Improvements PrOTect April 1,ZOl1 Montana Department of Environmental Quality 1520 E. 6thAvenue P.O. Box 2.00901 Hetena, MT 5962.0 GaryJ. Wiens. P.E. Montana Departmentof Environmental Quality P. O. Box 200901 Helena, MT 59620-0901 I Phone: (406)444-7838
Draft Environmental**Assessm~** (EA) documentsforthe O'Nefroal Qutcrop FIre In Pralne County February 25, 2.011 Montana Departmentof Environmenta! Quality 1100 N Last CnanceGulch Helena, MT 59620-0901 MikeGlenn (406) 841-S070 Fax: (406) 841-S0S0 

# , Findin%f0,f No Significant Imoa4for Town Eureka Water System Improvements PrOTect February 6, 2011 1520 E. 6thAvenue P.O. Box 200901 Helena, MT 5962.0 Mark Smith. P. E. Montana Departmentof Environmental Quarity P. O. Box 200901 Helena, MT S962.0-0901 Phone: (406)444-5325

### NO PUBLIC COMIVIENTS WERE RECEIVED FOR THE STATE IMPLEMENTATION PLAN FOR GREAT FALLS OR BILLINGSVolume II Cha ter 7 STATE OF MONTANA AIR QUALITY CONTROL IMPLEMENTATION PLAN SUbject: Cascade County Carbon Monoxide Limited Maintenance Plan



### 7.10 GREAT FALLS CARBON MONOXIDE LIMITED MAINTENANCE PLAN

Dated: December 19, 2000 Replaces Page: 7.10 (1)

TBD Page: 1 of 1 Page 7.10 (1)

### Volume II Cha ter7 STATE OF MONTANA AIR QUALITY CONTROL IMPLEMENTATION PLAN Subject: Cascade County Carbon Monoxide Limited Maintenance Plan



### 7.10.1 Introduction

As a result ofthe 1977 amendments to the Clean AirAct (CM), Great Falls was designated as nonattainmentfor carbon monoxide (CO) by the U.S. Environmental Protection Agency (EPA) in a Federal Register (FR) notice (45 FR 59315) on September9, 1980. The National Ambient Air Quality Standard (NMQS)for CO is 9 parts per million (ppm) foran 8-hour average concentration, not to be exceeded more than once per calendaryear. Following the nonattainment designation, control plans were developed but none were approved by EPA. The Great Falls CO nonattainment issue was reevaluated in September 1990 based on the requirements in the 1990 amendments to the CMand the lack ofexceedances in the 1988 and 1989 CO monitoring data. In the November6, 1991 FR (56 FR 56799), Great Falls was listed as a "Not Classified" CO nonattainment area (NM). However, EPA's redesignation process required a new EI (EI) and development ofa maintenance plan.

The Montana Department of Environmental Quality (Department) developed a redesignation request 

### with guidance based on the 1990 CMamendments and a September4, 1992 EPA memo from John Calcagni to the EPA Regional Air Directors. The Governorof Montana submitted the redesignation requestto EPA on February 9, 2001, and EPA approved it in the May 9,2002 FR (67 FR 31143). Section 107(d)(3)(E) ofthe CMdefines the five required criteria ofa redesignation request. The criteria are as follows:

Criterion 

### 1: AttainmentoftheApplicable NationalAmbientAir QualityStandard Criterion 2: State Implementation Plan Approval Criterion 3: PermanentandEnforceable Improvements in Air Quality Criterion 4: FulfillmentofCAA Section 110 andPart

### 0 Requirements Criterion 5: FullyApprovedMaintenance Plan under CAA Section 175A



### Replaces Page: 7.10.1 (1) Dated: December 19, 2000

TBD Page: 1of 2 Page 7.10.1 (1)

### Volume II Cha ter 7 STATE OF MONTANA AIR QUALITY CONTROL IMPLEMENTATION PLAN SUbject: Cascade County Carbon Monoxide Limited Maintenance Plan

Criterion 5 is addressed based on fulfillment ofcriteria addressed in the October 6, 

### 1995 EPA memo from Joseph Paisie, Group Leaderfor Integrated Policy and Strategies Group. That memo stated nonclassifiable CO nonattainment areas fUlfilling specific criterion could choose to seek redesignation undera limited maintenance plan (LMP) ratherthan the more rigorous full maintenance plan. Atthe end of2009, Great Falls still met the LMP criterion as outlined in the Paisie memo by having a CO design value at or below 7.65 ppm (85 percent ofthe 8-hr NAAQS).

Underthe LMP option ofCAA Section 175A, afterthe initial 1O-year period, States are required to submit a revision or update to the LMP for another 10-year period. The Department has updated the 2002 Great Falls CO LMP and the revisions are discussed underthe following five provisions.

Replaces Page: 7.10.1 (2) 

### Dated: December 19, 2000

TBD Page: 

### 2 of 

### 2 Page 7.10.1 (2)Volume" Cha ter 7 STATE OF MONTANA AIR QUALITY CONTROL IMPLEMENTATION PLAN Subject: Cascade County Carbon Monoxide Limited Maintenance Plan



### 7.to.6.1 Provision 1: Attainment Inventory

On February 1, 2000, the Departmentsubmitted an EI for 1996to EPA as part ofthe Great Falls CO redesignation request. The CO emissions in the EI were calculated to represent a standard CO season day, a typical 'winterday' in a typical 'CO season' for the base year of 1996 (January 1to December 31). The CO season covered the months of November, December, and January 1996. A weekday during the CO season was selected since the highest average daily traffic (ADT) generally occurs during the work week (i.e., Monday

- Friday). The study area included 150 one-kilometersquared (km2) grids which included the Great Falls NAA, and the greater Great Falls urban area, including the community of Black Eagle.

The total amount ofCO emissions estimated in the 1996 Great Falls CO EI study area on a standard CO season weekdaywas 53,945.52 kilograms (kg). Twenty-four area and three industrial point sources were identified as significant CO emitters. These sources were assigned to seven broad categories: aviation exhaust (721.21 kg/day), commercial and residential natural gas combustion (312.62 kg/day), industrial point sources (180.46 kg/day), nonroad motorexhaust (4,676.0 kg/day), railroad locomotive exhaust (24.30 kg/day), residential wood burning (5,644.12 kg/day), and roadway motor vehicle exhaust (42,386.81 kg/day).

Motorvehicle exhaust contributed the majority (78.57 percent) ofall estimated CO emissions. Minor contributing source categories and their corresponding daily percentage ofcontribution were residential wood burning devices (10.46 percent), nonroad motorexhaust (8.67 percent), and aviation exhaust (1.34 percent). Commercial and residential natural gas combustion, railroad locomotive exhaust, and three industrial point sources all emitted less than one percent ofthe estimated daily CO emissions in the 1996 Great Falls CO EI study area.
The 1996 CO EI used estimates ofactual emissions and the 2009 CO EI update was developed with surrogates applied to the 1996 EI emissions, exceptforthe industrial point sources where actual emissions were obtained from the Department's permitfees database (CEDARS -Consolidated Environmental Data Acquisition and Retrieval System). The emissions were again divided into seven source categories: aviation

Replaces Page: 7.10.6.1 (1) Dated: December 19, 2000

TBD Page: 1of 7 Page 7.10.6.1 (1)

### Volume II Cha ter 7 STATE OF MONTANA AIR QUALITY CONTROL IMPLEMENTATION PLAN Subject: Cascade County Carbon Monoxide Limited Maintenance Plan

exhaust, commercial and residential natural gas combustion, industrial point processes, nonroad motorvehicle exhaust, railroad locomotive exhaust, residential wood burning, and onroad motorvehicle exhaust. The 1996 EI was updated to 2009 levels using a combination offactors such a population growth, change in traffic volumes, and the results ofthe most recent EI of industrial point sources, which are discussed below.
Population The percent change in the population ofCascade County from 1996 to 2009 was selected as a surrogate to estimate the change in emissions for several area source categories. Everyyear by July 1, the Montana Department ofCommerce, Census and Economic Information Center (CEIC) estimates the population of Montana cities and counties using U.S. Census data. As ofJuly 1, 1996, the population ofCascade Countywas estimated at 82,4291 and on July 1, 2009, the county population was estimated at 82,1782, a decrease of0.31% (-0.31%) overthe 1996 to 2009 time period. Overthe same time period, the estimated population ofthe city ofGreat Falls increased from 57,881 to 59,3663, resulting in a change of2.50 percent. Department staff, using professionaljudgment, elected to use the change in the city population as the more conservative value for estimating increases in certain area source categories.

Industrial PointSources Table 7.1 0.6.1.A presents the estimated actual 1996 and 2009 emissions for a CO season dayfor the three point sources in the Great Falls CO NAAwith their 1996 operating schedules. For consistency and due to lack ofadditional information, the 1996 operating schedules were applied to the annual 2009 emissions. In addition, a relatively significant point source was added to this table, the City ofGreat Falls WastewaterTreatment Plantthatwas not operational in 1996. It should be noted that no industrial point sources exitwith the Great Fall CO NAA.

1 http://www.ceic.mt.gov/HistoricaIPopData.asp 2 http://www.ceic.mt.gov/index.asp 3 http://ceic.mt.gov/



### Dated: December 19, 2000 Replaces Page: 7.10.6.1 (2)

TBD Page: 2 of7 Page 7.10.6.1 (2)Volume 1/ Cha ter 7 STATE OF MONTANA AIR QUALITY CONTROL IMPLEMENTATION PLAN Subject: Cascade County Carbon Monoxide Limited Maintenance Plan

Table 7.10.6.1.A. PointSource Emissions inthe Great Falls CO NAA, 1996 and 2009 CO Season Days.

1996 2009 Actual Actual

CO CO Percent of Season Season Emissions (kg Hours

. Weeks Daysl During CO COICO Source Week Near Season da 1 da IDa (kg COICO

City ofGreat Falls Wastewater Treatment Plant 52 7 

## o 0.00 171.85 171.85 4176 24 MontanaAir

National 24 7 52 25 28.72 16.69

-41.9 2930 Guard Base I

Malmstrom Air

Force Base 44 47.62 103.68 117.8 1427 24 7 31 Montana Refining Com an 24 52 25 104.13 38.43

- 63.09 2161 7

--**-_~_------** . -
Totals 180.46 329.65 46.17
1. kg = kilograms.
Any industrial point source emitting less than 1 metricton during a CO season day in the Great Falls CO NAAwas not included in this table for consistency with the approach in the development ofthe initial 1996 Great Falls CO EI. This method eliminated the six point sources listed in Table 7.10.6.1.8. Ifthese six sources were included in the 2009 EI update. their emissions would only represent approximately4% ofthe total CO emissions from the point sources within the Great Falls CO NAA.

Replaces Page: 

# I Dated:

TBD Page: 3 of 7 Page 7.10.6.1 (3)Volume II Cha ter 7 STATE OF MONTANA AIR QUALITY CONTROL IMPLEMENTATION PLAN Subject: Cascade County Carbon Monoxide Limited Maintenance Plan



### Table 7.10.6.1.8. PointSources 

### &Emissions Omitted from the 1996to2009 CO Season Day Update.

Permit Source 2009 Actual CO Season Number Cereal Food Processors, Inc. 1.04 2885 CHS Incor orated 7.87 2842 General Mills Flour Mill 0.41 2849 Great Falls Animal Shelter 0.39 3082 Montana S ecialt Mills, LLC 1.04 2968 Westfeeds, Inc. 2.24 3093

._­ Total 12.99
1. kg 

# =kilograms.



### Annual Average DailyTraffic The mobile source EI surrogate chosen was annual average dailytraffic (AADT) increases based on data collected overthe 1996 to 2009 time period by Montana Department ofTransportation automatictraffic recorders (ATR) on the roadways in the Great Falls CO EI study area4. The three, representative data sets chosen were:

• 10th Avenue South (U.S. 89) between 9th and 10th Streets,
• 25th Street North between 4th and 5th Avenues, and
• 26th Street North between 4th and 5th Avenues.

These roads are classified as principal arterial and minor arterials (2), respectively. Note: the 10th Avenue South arterial is within the Great Falls CO NAA. Table 7.10.6.1.C lists the AADT data collected during the 1999 through 2009 period forthese three roads.

4 http://www.mdt.mt.qov/publications/docs/datastats/atr/atrbook09.pdf

_R_e_p_la_c_e_s_p_a_g_e_: I_D_a_t_e_d_: -=-_----:----::--::::

__ TBD Page: 4 of 7 Page 7.10.6.1 (4)Volume" Cha ter 7 STATE OF MONTANA AIR QUALITY CONTROL IMPLEMENTATION PLAN Subject: Cascade County Carbon Monoxide Limited Maintenance Plan

Table 7.10.6.1.C. AADT Data for Selected Roads in the Great Falls CO NAA, 1996

- 2009.

AnnualAverage DailyTraffic Year 10th Avenue South 25th Street North 26th Street North
1996 35,153 4,107 3,530 1997 35,884 4,141 3,511 1998 35,457 4,183 3,686 1999 4,520 3,833 2000 4,218 3,572 2001 36,354 4,243 3,535 2002 37,612 4,205 3,457 2003 39,071 4,351 3,756 2004 40,280 4,580 3,730 2005 38,770 4,060 3,370 2006 38,330 3,930 3,390 2007 38,161 3,876 3,229 2008 37,283 3,741 3,130 2009 37,378 3,825 3,052 1996to 2009.<"1% 6.33 -6.87 -13.54

The average ofall percent changes in AADTforthe three roadways over 1996 to 2009 was - 4.69%. The percent change value of6.33% from the 10th Avenue South data was selected as a representative value forthis demonstration since itwas derived from an ATRwithin the Great Falls CO NAA.

Replaces Page: 

# I Dated:

TBD Page: 5 of 7 Page 7.10.6.1 (5)Volume II Cha ter 7 STATE OF MONTANA AIR QUALITY CONTROL IMPLEMENTATION PLAN Subject: Cascade County Carbon Monoxide Limited Maintenance Plan

The designated Great Falls CO NAA is two (2) blocks wide by aboutfour miles long or about 1.5 km2 within the city ofGreat Falls. The 1996 Great Falls CO EI encompassed 150 one km2 grids that included the NAA, which was about 1% ofthe inventoried study area. The 1996 EI did not estimate the CO emissionswithin the NAA, therefore, the 2009 emissions address the entire Great Falls EI study area. The overall result ofthe Great Falls CO NAA EI update from 1996to 2009 for a CO season day in kg is listed in Table 7.10.6.1.0.

_R_ep_l_ac--=e::-::s::-p_a_g_e_: I_o_a_t_ed_: 

## -=------=----=--=-­ TBO Page: 6 of 7 Page 7.10.6.1 (6)Volume II Cha ter7 STATE OF MONTANA AIR QUALITY CONTROL IMPLEMENTATION PLAN Subject: Cascade County Carbon Monoxide Limited Maintenance Plan



### Table 7.10.6.1.0. Great Falls CO NAA Emissions Comparison between 1996

### & 2009 CO Season Days.

Source CateQorv 1996Total Emissions (kg CO/CO day)1 1996 Percent ofTotal 2009 Total Emissions (kg CO/CO day) 2009 Percent ofTotal Percent Change 1996to

2009 Surrogate Aviation 721.21 1.34 739.24 1.30 2.50 Population Commercial &

Residential Natural Gas 312.62 0.58 320.44 0.56 2.50 Population Industrial Point Permit Fee Sources 180.46 0.33 263.78 0.46 46.17 EI Nonroad Motors 4676.00 8.67 4792.90 8.41 2.50 Population Railroad Locomotives 24.30 0.05 24.91 0.04 2.50 Population Residential Wood Burninq 5,644.12 10.46 5785.22 10.15 2.50 Population Roadway Motor Vehicle 42,386.81 78.57 45,069.90 79.08 6.33 AADT2

TOTAL 53945.52 100.00 56,996.38 100.00 9.29 (Averaqe)



### -­
1. kg 

### =kilograms.

2. AADT

### =Annual average daily traffic.

# _R_e_p_la_c=e~s"=p_a_g_e_: I_D_a_t_e_d_:

_ TBD Page: 7 of 7 Page 7.10.6.1 (7)

### Volume II Cha ter 7 STATE OF MONTANA AIR QUALITY CONTROL IMPLEMENTATION PLAN Subject: Cascade County Carbon Monoxide Limited Maintenance Plan



### 7.10.6.2 Provision 2: Maintenance Demonstration

An October6, 1995 EPA memo from Joseph Paisie, Group Leaderfor Integrated Policy and Strategies Group stated nonclassifiable CO nonattainment areas fulfilling specific criteria could choose to seek redesignation under a less rigorous plan than the full maintenance plan. To qualify for the LMP option, the CO design value forthe area, based upon the eight quarters (two years ofdata) used to demonstrate attainment must be at or below 7.65 ppm (85 percent ofthe 8-hr NAAQS). Additionally, the design value forthe area must continue to be at orbelow 7.65 ppm until the time offinal EPA action on the redesignation request. Design values are determined based on the procedure outline in a June 18, 1990 EPA memo from William Laxton, Director ofthe Technical Support Division. Forthe 8-hour NAAQS, the design value is determined by the second maximum 8-hour concentration value forthe most recent two years or eight quarters ofdata. The larger ofthe second maximum values (orthe "highest ofthe second highs") is used as the design value for each CO monitoring site. Ifmore than one monitoring site exists in the area, the highest site design value is used as the design value forthe entire NAA.

Forthe development ofthe initial Great Falls CO LMP, there was only one monitoring site, Skyway Conoco at 700 10th 

### Avenue South, operating in the Great Falls CO nonattainment area during 1998 and 1999. Forthe initial LMP, the "highest ofthe second highs" was monitored in 1998with a design value of4.5 ppm. Since that design value was belowthe 7.65 ppm limit, the Great Falls CO NAA metthe eligibility criterion for a LMP.

Over approximately the next decade, another CO monitoring site, Overlook Park, operated in the Great Falls area. The Department documented the installation and removal ofthe Overlook Park and Skyway Conoco sites, respectively, through the annual network review process and via the submittal of network modification request forms to the EPA Region 8 office. All monitoring site actions were approved by EPA Region 8. The current CO monitoring site in Great Falls, Overlook Park (#30-013­ 0001), has operated in the city park at the corner of 10th 

### Avenue South and 2nd 

### Street since mid-2001. Based on the data from 2008 and 2009, the latest design value is 1.6

Replaces Page: 7.10.6.2 (1) Dated: December 19, 2000

TBD Page: 1 of 2 Page 7.10.6.2 (1)Volume II Cha ter 7 STATE OF MONTANA AIR QUALITY CONTROL IMPLEMENTATION PLAN Subject: Cascade County Carbon Monoxide Limited Maintenance Plan

ppm, which is well belowthe 8-hr NAAQS of9 ppm and the CO LMP eligibility threshold of7.65 ppm. Figure 7.10.6.2.A represents the second highest8-hrCO concentrations from all three of Montana's CO NAAs from 1998 through 2009.



### 1998-2009 MT CO NAA 

### Review 2nd Max 8-Hr**~ssoula** #30-063-0005 • Great Falls #30-013-0001 • Billings**#30-11~** 12,.-----------------------------------,

11 +------.-------------------------,---­ 8-Hr NAAQS/MAAQS 10 +--------------------T-----------------j

o 2 C 8 +----------;;;;C"-:-:-;:;==-::----------------------­ .S! 

## := 7**+--"=-"~'---------r--------------------------1** :!:**;6+----r'------II-------------------~~~tcC-------I** [l. 5 +-----HlI--­ -----==--­ ----------­ III [l. 4

3

1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 Year



### Figure 7.10.6.2.A. Second highest8-hrCO concentrations in Montana CO NAAs from 1998 through 2009.

_R_e_p_la_c_e-,-s.,--p_a_g_e_: I_D_at_e_d_: -:::-_----:------::--:-

__ TBD Page: 2 of 2 Page 7.10.6.2 (2)

### Volume" Cha ter 7 STATE OF MONTANA AIR QUALITY CONTROL IMPLEMENTATION PLAN Subject: Cascade County Carbon Monoxide Limited Maintenance Plan



## 7.10.6.3 Provision 3: Monitoring NetworkNerification ofContinued Attainment

CO compliance monitoring in the Great Falls area will continue. In the previous LMP this consisted ofthe Department and the Cascade City/County Health Department (CCCHD) operating a gaseous CO monitoring instrument in an ambient air monitoring shelter in accordance with the Montana QualityAssurance Project Plan (QAPP), the EPA Quality Assurance Manual (EPA-600/9-76-005, revised December 1984), 40 CFR Part 50 including Appendix C, and 40 CFR Part 58 inclUding Appendices A through G. Precision and accuracy data from the CO monitoring site(s) was submitted to EPA on a regular basis through the federal air quality database.

The Departmentwill continue to monitor CO using an instrumental method or a functionally equivalent monitoring methodology as approved by EPA. Emergency episode CO monitoring in Great Falls shall be conducted, if necessary, in accordance with Montana's Emergency Episode Avoidance Plan.

Date: December 19, 2000 Replaces Page: 7.10.6.3 (1)

TBD Page: 1 of 1 Page 7.10.6.3 (1)

### Volume II Cha ter 7 STATE OF MONTANA AIR QUALITY CONTROL IMPLEIVIENTATION PLAN Subject: Cascade County Carbon Monoxide Limited Maintenance Plan



### 7.10.6.4 Provision 4: Contingency Plan

Section 175(A)(d) ofthe CAA requires that the maintenance plan contain contingency provisions to assure that Montana will promptly correct any violation ofthe CO NAAQS that might occurafterthe Great Falls CO NAAwas designation back to attainment. EPA's redesignation guidance notes that Montana is not required to have fully adopted contingency measures that would take effect withoutfurther action by Montana. However, the contingency plan should ensure that contingency measures are adopted expeditiously once the need is triggered. The primary elements ofthe maintenance plan involve the tracking and triggering measures to determine when contingency measures are needed and a process for implementing appropriate control measures.



### A. CO Concentration Tracking



### As mentioned above in Provision 3, the Department and CCCHD will conduct traditional gaseous CO monitoring orsurrogate compliance monitoring in the Great Falls area.


### B. SIP-Mandated Trigger and Response

i. Trigger

The LMP will use one exceedance ofthe CO NAAQS as the triggerfor adopting specific contingency measures. The adopted contingency measure(s) will be implemented only ifa violation ofthe CO NAAQS occurs. Notification to EPA and to the local governments in the Great Falls area ofany exceedance will occurwithin 60 days as part ofthe QualityAssurance/Quality Control (QAlQC) 

### monitoring procedure.

ii. Response Upon notification ofa CO NAAQS exceedance, the Department and CCCHD will recommend appropriate contingency measure(s) intended to avoid aviolation of the CO NAAQS. Information on the historical exceedances ofthe standard, the

Replaces Page: 7.10.6.4 (1) Date: December 19, 2000

TBD Page: 1of 3 Page 7.10.6.4 (1)Volume II Cha ter 7 STATE OF MONTANA AIR QUALITY CONTROL IMPLEMENTATION PLAN Subject: Cascade County Carbon Monoxide Limited Maintenance Plan
meteorological conditions related to the recent exceedance(s), and the most recent estimates of population and traffic growth and emissions will be reviewed. The possibility that an exceptional or natural event occurred will also be evaluated. Following the review ofthis information, the necessary contingency measure(s) will be proposed for local adoption. The local adoption process will be completed within three months ofthe exceedance notification. The contingency measures provide a maintenance area with the opportunity to maintain its status as an attainment area.
Ifand when a violation ofthe NAAQS occurs, the locally adopted contingency measure(s) will be fully implemented within one year. Section 175(A)(d) ofthe CAA states:

The failure ofanyarea redesignatedas an attainmentarea to maintain the nationalairqualitystandardconcernedshallnotresultin 

### a requirementthat the State revise its State implementationplan unless theAdministrator, in the Administrator's discretion, requires the State to submit 

### a revised State implementation plan.

C. Possible Contingency Measures

The CCCHD may choose one or more contingency measures to recommend to local officials and the Departmentfor consideration. The CCCHD will select contingency measures designed to bring the area back into compliance with the CO NAAQS quickly and to specifically meetthe needs ofthe Great Falls area. Some potential contingency measures include:

• Implementation a local oxygenated fuel program in the Great Falls or Cascade County area for the winter months of November, December, and January (typically the months with the highest ambient CO levels);
• Implementation ofan episodicwoodburning curtailment program; and/or
• Otheremission control measures appropriate forthe area that are yet to be defined.

Replaces Page: 7.10.6.4 (2) Date: December 19, 2000

TBD Page: 2 of

### 3 Page 7.10.6.4 (2)

### Volume II Cha ter 7 STATE OF MONTANA AIR QUALITY CONTROL IMPLEMENTATION PLAN Subject: Cascade County Carbon Monoxide Limited Maintenance Plan

D. Maintenance Plan Requirements

Aftersubmittal and approval ofthis second 10-yr LMP, there are no further requirements for any additional revisions ormodifications to the LMP.

Replaces Page: 7.10.6.4 (3) 

### Date: December 19,2000

TBD Page: 3 of 3 Page 7.10.6.4 (3)

### Volume II Cha ter 7 STATE OF MONTANA AIR QUALITY CONTROL IMPLEMENTATION PLAN Subject: Cascade County Carbon Monoxide Limited Maintenance Plan



## 7.10.6.5 Provision 5: Conformity Determinations Under Limited Maintenance Plans

The conformity provisions ofthe second 1O-year plan will continue from the initial plan. Since the Great Falls area was a 'Not Classified' nonattainment CO area, only some of the general provisions ofthe CAA Part D apply. These include the "General" and "Transportation" conformity provisions ofCAA Section 176(c). The conformity provisions ensure thatfederally funded orapproved projects and actions conform to the air quality planning goals ofthe Great Falls CO control plan before they are constructed. Forthe purpose ofthe LMP for Great Falls, the conformity issues are slightly differentthan in a full maintenance plan and are explained below.

The transportation conformity rule of November24, 1993 (58 FR 62188) and the general conformity rule of November 30,1993 (58 FR 63214) apply to nonattainment areas and maintenance areas operating under maintenance plans. Undereither rule, conformity can be demonstrated by indicating that the expected emissions from planned actions are consistentwith the emissions budgetforthe area. In areas with LMPs, conformity determinations are still required, but a LMP has no emission budget because "emissions budgets in limited maintenance plan areas may be treated as essentially not constraining forthe length ofthe initial maintenance period" ("Limited Maintenance Plan Option for Nonclassifiable CO NonattainmentAreas," memorandum from Joseph Paisie to the EPA Regional Air Branch Chiefs, October6, 1995).

For general conformity, all projects are considered to satisfythe "budgettest" specified in 40 CFR 93.158(a)(5)(i)(A) once EPA has approved this redesignation request. For transportation conformity, federal actions requiring conformity determinations are considered to satisfythe budget test specified in sections 93.118, 93.119 and 93.120 of the conformity rule once this LMP is found adequate by EPA. In Great Falls, federal actions are also considered to satisfythe transportation conformity rule's requirements for expeditious implementation oftransportation control measures (TCMs), because there are no TCMs in the Great Falls SIP. Transportation plans, transportation improvement programs and Federal projects still require conformity determinations in orderto proceed, and Federal projects are still subjectto the hotspot modeling requirements ofthe transportation conformity rule.

Replaces Page: 7.10.6.5 (1) Dated: December 19, 2000

TBD Page: 1 of 1 Page 7.10.6.5 (1)

### Volume II Cha ter 7 

### STATE OF MONTANA Subject: Cascade County 

### AIR QUALITY CONTROL Carbon Monoxide Limited 

### IMPLEMENTATION PLAN Maintenance Plan



### END OF DOCUMENT

_R_e_pl_a_ce_s_p_a_g_e_: I_D_a_te_d_:

-----­ Page: Page