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Maintenance Plan for the Illinois Portion ofthe Chicago Qzone NonattainmentArea' Forthe 1997 8-Hour Ozone Standard

AQPSTR08-08

November 15, 2008 Illinois Environmental Protection Agency 1021 North Grand Avenue East Springfield, Illinois 62794-9276 

# ._--_.._----
ATTACHMENT 1

### TABLE OF CONTENTS Page

LIST OFTABLES

. LIST OFFIGURES

. EXECUTIVE SUMMARY

. 111 

### iv
5 

### 1.0 INTRODUCTION. 6 1.1 Regulatory BackgroUnd 6 1.2 Status ofAir Quality

. 8 2.0 REDESIGNATION AND MAINTENANCE PLAN REQUIREMENTS 9 3.0 OZONE MONITORING 11 3.1 MonitoredDesignValues 11 3.2 Quality Assurance 13 3.3 ContinuedMonitoring 13 4.0 EMISSION INVENTORY

. 14 4.1 AttainmentyearInventory

- 2006 14

. 4.2 AirQualityImprovements and Emission Controls 15

4.3 Emission Projections

. 16 4.4 Demonstration ofMaintenance 17 4.5 Provisions for Future Updates 18 5.0 CONTROLMEASURES AND REGULATIONS 19 5.1 AttainmentDemonstrationControl Measures 19 5.2 Reasonable FurtherProgress 20 5.3 Reasonably Available Control Technology (RACT)

. 21 5.4 Controls to Remain in Effect. 22 5.5 Provisions for Permitting New orModifiedEmission Sources 22 5.6 Transportation Conformity 22 6.0 CONTINGENCYMEASURES 24 6.1**Con~gency** 

### Measures 24 6.2 COImpitmentto Revise Plan 26 6.3 Public Participation

. 27 6.4 Legal Authority to Implement andEnforce 27 7.0 CONCLUSIONS 28 TABLE OF CONTENTS (Continued) 1

### APPENDIXA Summary ofAmbientAir Monitoring Data (2006-2008) APPENDIX B Transportation Conformity

11

### LIST OF TABLES Page Table 4.1 

### 2006 Chicago Ozone NonattainmentArea YOM andNOxEmissions 14 Table 4.2 

### 2002 Chicago Ozone NonattainmentArea YOM andNOxEmissions 15 Table 4.3 

### 2013 Chicago Ozone NonattainmentArea YOM andNOxEmissions 16 Table 4.4 

### 2020 Chicago OzoneNonattainmentArea YOM andNOxEmissions 17 Table 4.5 

### Comparison of2006, 2013, and2020 EmissionEstimates ChicagoNonattainmentArea

. 17 Table 4.6 

### EstimatedNOx EmissionReductions from Utility Boilers Resulting from ImplementationofIllinois, Multi-Pollutant Standards. 18 Table 5.1 

### Proposed ChicagoNAAYear2020 MotorVehicle Emissions Budgets

...23 Table 6.1 

### ContingencyPlanfor the Chicago 8-HourOzone NonattainmentArea

...25

III

### LIST OF FIGURES
Figure 1.1 

### Map ofthe Lake MichiganNonattainmentAreas Figure 3.1 

### Ozone Monitors in the Lake Michigan Area

. Figure 3.2 

### Comparison of8-HourOzone Design Values for the Lake Michigan Region Between 2001-2003 and2006-2008

.

IV 

### Page 7 11



### 12

### EXECUTIVE SUMMARY This documentdescribes Illinois' Maintenance Plan for the Illinois portion ofthe Chicago ozone nonattainment area. A Maintenance Plan is requiredbefore the area canbe redesignated from nonattainnient to attainmentofthe 8-hour ozone National Ambient Air Quality Standard (NAAQS) promulgated in 1997. This document also provides technical informationrequired to support aredesignation request. Illinois intends to submit such a requestto the U. S. Environmental Protection Agency (U.S. EPA). The Illinois Environmental ProtectionAgency (Illinois EPA) has preparedthis plan in consultation with the IndianaDepartment of Environmental Management (IDEM), the Wisconsin DepartmentofNatural Resources (WDNR), and the Michigan DepartmentofEnvironmental Quality (MDEQ), the Lake Michigan Air Directors Consortium (LADCO), andU.S. EPA. The IDEM is preparing a similarplan for the Indianaportion ofthe Chicago nonattainment area. Ozone air qualityhas dramatically improved in the Lake Michiganregion as aresultof implementation ofState and Federal control measures since the designation ofthe Chicago area as nonattainment in 2004. With the exception ofHolland, Michigan, the entire Lake Michigan region, including the Chicago nonattainment area, has atleastthree years ofcomplete, quality assured ambient air qualitymonitoring data for 2006-2008 that demonstrates compliance with tlie 1997 8-hour ozoneNAAQS. These air quality improvements are due to permanentand enforceable emission control measures. This Maintenance Planprovides for the'continued attainmentofthe 8-hourozone air quality standard for the Chicago**nonattainmen~** area for a period oftenyears afterU.S. EPAhas formally redesignated the areato attainment. The Plan also provides assurances that, even if there is a subsequentviolation ofthe air quality standard, measures listed in the Planwill prevent any future occurrences throughcontingency measures that wouldbe triggered upon such an occurrence.



### t,



### 5

### 1.0 INTRODUCTION This document describes Illinois' Maintenance Plan for the Illinois portion ofthe Chicago ozone nonattainment area. A maintenance plan is requiredbefore the area canberedesignated from nonattainment to attainment ofthe 8-hour ozone National AmbientAir Quality Standard (NAAQS) promulgatedby the U. S. Environmental ProtectionAgency (U.S. EPA) in 1997. Illinois intends to submit such a request to the U.S. EPA in conjunction with this Maintenance Plan. The Illinois EPA has prepared this plan in consultation with the Indiana Department of Environmental Management (IDEM), the Wisconsin Department ofNatural Resources (WDNR), and the MichiganDepartment ofEnvironmental Quality (MDEQ), the Lake Michigan Air Directors Consortium (LADCO), and U.S. EPA. The IDEM is preparing a similarplan for the Indiana portion ofthe Chicago nonattainment area. With the exception ofHolland, Michigan, the entire Lake Michiganregion, including the Chicago area, has at least three years ofcomplete, quality assured ambient airquality monitoring data for 2006-2008, demonstrating attainment with the 8-hour ozone NAAQS. This document also provides the technical information needed to support arequest to redesignate the Chicago areato attainment ofthe 8-hourozone NAAQS. Section 107 ofthe CleanAirAct (CAA) establishes specific requirements to be met in order for anonattainment area to be considered forredesignation. Before an area canbe reclassified to attainment, U.S. EPA must make a determination that the area has attained the 8-hourozoneNAAQS based on atleastthree complete years ofambient monitoring data. U.s. EPA musthave approved a State Implementation Plan (SIP) for the area under Section 110 and PartD ofthe CAA. The state must demonstrate that the improvement in air quality is due to permanent and enforceable reductions in emissions resulting from implementation ofthe SIP and other federal requirements. Finally, the state must submit, and U.S. EPA must approve, a maintenance plan under Section 175(A) ofthe CAA, including provisions for contingency measures that will be implementedif future violations ofthe 8-hour ozone NAAQS are measured. This Maintenance Planprovides for the continued attainment ofthe 8-hour ozone NAAQS for the Chicago nonattainment area (NAA) for a period oftenyears afterU.S. EPA has formally redesi,gnated the area to attainment. The Plan also provides assurances that even ifa subsequent violation ofthe ozone NAAQS occurs, provisions in the Plan will prevent any future occurrences through contingency measures that would.be triggered upon such occurrence. This document addresses the maintenance planrequirements establishedby the CAA andU.S. EPA, and includes additional information to supportcontinued compliance with the 8-hour

.ozone NAAQS.

1.1 Regulatory Background The CAA, as amended in 1990, requires areas that fail to meet theNAAQS for

### o~one to develop SIPs to expeditiously attain and maintain theNAAQS. Historically, exceedances ofthe ozone NAAQS have been monitored inCook and Lake Counties in Illinois, and in portions of Wisconsin, Indiana, and Michigan immediately downwind ofthe Chicago, Gary, and Milwaukee metropolitan areas. 

### 6The Chicago NAA, which includes Lake and Porter Counties in northwestIndiana, was originally designated as nonattainment in 2004 pursuant to the 1997 revisions to the ozone National AmbientAir Quality Standard. Several counties in easternWisconsin, and one county in western Michigan adjacentto Lake Michigan were also designated as nonattainment ofthe 8- hour ozoneNAAQS, although these areas are separate from the Chicago NAA. Figure 1.1 depicts the currentNAAs in the Lake Michigan region. 

### Figure 1.1 

### Map ofthe LakeMichigan Ozone NonattainmentAreas**,i~**

The following is a list ofthe counties, and portions thereof, contained in the Chicago 8-hour ozone severe nonattainment area:

• CookCounty, IL

• Lake County, IL

• DuPage County, IL

• McHenry County, IL

• Kane County, IL

• Will County, IL 

### 7

### • Grundy County, IL (Aux Sable and Goose Lake Townships)

• Kendall County, IL (Oswego Township)

• Lake County, IN

• Porter County, IN As aresult ofthe designation as nonattainment and the accompanying classification as moderate, these areas were subjectto new requirements, including development ofaplan demonstrating thatthe area would meetthe federal8-hour NAAQS for ozoneby June 15,2010. Recognizing the need for a regional solution, the States ofIllinois, Indiana, Michigan, Ohio, and Wisconsin worked cooperatively, under the auspices ofthe Lake Michigan Air Directors Consortium (LADCO), tojointlydevelop and evaluate an effective regional attainment strategy
. to enable the Lake Michigan region to attain the 8-hour ozone NAAQS. The attainment strategy recognizes the importance ofboth locally generated ozone precursor emissions and the need for significantreductions ofincoming (transported) ozone and ozone precursor emissions (including oxides ofnitrogen, orNOx) to allow the States-to attain the NAAQS. The emission reductions needed to attain the 8-hour ozoneNAAQS include both State andFederal measures thathave reduced ozone precursoremissions both locally and regionally. These measures have allowed the Chicagononattainment area 

### to attain the 8-hour ozone standardby the attainment deadline establishedby the U.S. EPA. 1.2 Status ofAirOuality Ozone monitoring data for the most recent three-yearperiod, 2006 through 2008, demonstrates that airquality has metthe NAAQS for the 8-hour ozone NAAQS in the entire Lake Michigan region, including the Chicago nonattainment area, with the exception ofHolland, Michigan. Modeling performed by LADCO shows thatHolland, MI will attain the ozone NAAQS by 2012.



### 8

### 2.0 REDESIGNATION AND MAINTENANCE PLAN REQUIREMENTS Sections 107 and 110 ofthe CAA list anumber ofrequirements that mustbe metby nonattainment areas prior to consideration for redesignation to attainment. One ofthose requirements is the maintenance plan, which reflects a state's plan for maintaining theNAAQS for aten-yearperiod afterredesignation to attainment. U.S. EPA has published guidance for the preparation ofmaintenance plans and redesignation requests. This guidance is contained in a document entitled "Procedures for Processing Requests to Redesignate Areas to Attainment" (September4, 1992). Before a redesignation to attainmentcanbe promulgated, U.S. EPA must:

• Determine that the NAAQS for ozone, as published in 40 CFR 50.4, has been attained. Ozone monitoring data must show thatviolations ofthe ambientNAAQS are no longer occurring. This showing must rely on three consecutive years ofdata. The ambient air monitoring data mustbe quality assured in accordance with 40 CFR 58.10, recorded 

### in U.S. EPA's Air Quality System (AQS) database, and is available to the public.

• Approve the state's plan for demonstrating attainment. The attainmentplan, which is based on air quality modeling, must contain enforceable control measures and mustbe submitted as a revision to the state's SIP after apublic hearing.

• Determine thatthe improvementin airqualitybetween the yearviolations occurred and the year that attainment was achievedis based onpermanent and enforceable emission reductions.

• Approve the state's maintenance plan. The requirements for the maintenance plan are discussedbelow.

• Determine that all otherrequirements applicable to nonattainment areas have beenmet. A maintenance plan provides for the continued attainmentofthe 8-hourozone NAAQS for a nonattainment area for period often years afterU.S. EPA has formally redesignated the area to attainment. The plan also provides assurances that even ifa subsequentviolation ofthe NAAQS occurs, provisions in the plan will prevent any future occurrences through contingency measures thatwouldbe triggeredupon such occurrence. To be approvable, the state is required to have a public hearing on the maintenance planprior to adoption. The maintenance plan must contain the following elements:

• A comprehensive emission inventory ofthe precursors ofozone completed for the "attainmentyear";

9• A projection ofthe emission inventory forward to a year atleast ten years after redesignation and a demonstration that the projected level ofemissions is sufficient to maintain the ozone NAAQS;
• A commitment that, onceredesignated, the·state will continue to operate an appropriate monitoring networkto verify maintenance ofthe attainment status; • A demonstration oflegal authority to implement and enforce all control measures contained in the SIP;

• Provisions for future updates ofthe inventory to enable tracking ofemission levels, including an annual emission statementfrom major sources;

• Motor vehicle emissions budgets for transportation conformity for the ten-year maintenance period;
• A commitmentto submita revisedmaintenance plan eightyears afterredesignation;
• A commitment to enactand implement additional contingency control measures expeditiously in the eventthat future violations ofthe NAAQS occur; • A list ofpotential contingency measures that wouldbe implemented in such an event. Illinois' Maintenance Planhas beenprepared in accordance with the requirements specified in u.S. EPA's guidance document and additional guidance received from U.S. EPA staff. The following sections ofthis documentdescribe how U.S. EPA's requirements have beenmet.



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### 3.0 OZONE MONITORING U.S. EPA's published guidance document, "Procedures for Processing Requests to Redesignate Areas to Attainment" (September4, 1992), details specific requirements regarding the collection and use ofambient airmonitoring data needed to support a redesignation request. Before the Chicago NAA canbe redesignated, Illinois must demonstratethat the NAAQS for ozone, as published in 40 CFR 50.4, has been attained. Ozone monitoring datamust show that violations ofthe NAAQS are no longer occurring within the nonattainment area. This showing mustrely on three complete, consecutive calendaryears ofquality assured data. Further, the air monitoring data mustbe quality assured in accordance with 40 CFR 58.10, recorded inU.S. EPA's AQS database, and made available to the public. Finally, Illinois must committo continue to operate an appropriate monitoring network to verify the maintenance ofthe attainment status, once the area has beenredesignated. The following subsections describe how each ofthese requirements has been addressed. 3.1 MonitoredDesign Values Currently there are 55 ozone monitors located in the nonattainmentcounties 

### in the Lake Michiganregion; 9 are located innorthwestern Indiana, 17 in northeastern Illinois, 13 iIi western Michigan, and 16 in easternWisconsin.



### Figure 3.1 Ozone Monitors in the Lake Michigan Area

11

### To detennine whetherthe NAAQS is being exceeded, the design value mustbe calculated. The currentU.S. EPA method for calculating the ozone design valueis to average the 4th 

### highest daily maximum 8-hourvalue for each year overthe 3-yearperiod. The calculated 8-hour ozone design values for the monitors inthe Lake Michiganregion for 2006-2008 are included as Appendix A ofthis report. Figure 3.2 compares the designvalues for the 2001-2003 periodfor monitoring stations in the Lake Michiganregionto the corresponding design values from 2006- 2008. The data demonstrate thatozone airquality has improved dramatically throughout the Lake Michiganregion andthatthe NAAQS for ozone has been attained for the 2006-2008 period at all locations exceptHolland, Michigan.

Figure 3.2 Comparison of8-Hour Ozone Design Values for theLake Michigan Region Between 2001-2003 and 2006-2008*

2001-2003 2006-2008*



### *Data for2008 arepreliminary and subjectto final verification.



### 3.2 Quality Assurance 12

### Illinois EPA has quality assured all data shown in AppendixAin accordance with40 CFR 58.10 and the Illinois EPA's QualityAssurance Plan, which describes Illinois EPA's standard operatingprocedures for operating the ambientmonitoring networkand validating the data. Illinois EPA has recorded the datainthe U.S. EPA's AQS database, which is available to the public. 3.3 ContinuedMonitoring Illinois commits to continue monitoring ozone levels according to 

### a U.S. EPA approved monitoringplan, as required to ensure maintenance ofthe ozoneNAAQS. Shouldchanges in the location ofan ozone monitorbecome necessary, Illinois EPA will workwithU.S. EPA to ensure the adequacy ofthe monitoring network. Illinois EPA will continue to quality assure the monitoring datato meet the requirements of40 CFR 58. Illinois EPA will continue to enterall datainto AQS on atimelybasis in accordance with federal guidelines.

134.0 EMISSIONS INVENTORY
A redesignation requestmust contain a demonstration that the improvement in air quality betweenthe yearthat violations occurred and the yearthat attainment was achieved is based on permanent and enforceable emission reductions. As describedpreviously in Section 3.0, a threeyearmonitoring period is used to evaluate whether attainmenthas been achieved. In this Section, the "attainmentyear" refers to the first year (2006) ofthe three-yearperiod (2006-2008) used to demonstrate attainment. The request should also include aprojection ofthe emission inventory to a year atleast 10 years following redesignation, a demonstration that the projected level ofemissions is sufficient to maintain the ozone NAAQS, and a commitment to provide future updates ofthe inventory to enable tracking ofemissionlevels during the 10-year maintenance period. 4.1 AttainmentYearInventory. 2006 Illinois EPA has prepared a comprehensive emissions inventory for the Illinois portion ofthe Chicago nonattainment area, including point, area, and on-road and off-road mobile sources for precursors ofozone (VOM and NOx) for the attainmentyear, 2006. This inventory is based on Illinois EPA's SIP submittal entitled, "Illinois BaseYear Ozone Inventory for 2002", (June 2006). Point source information was compiled from 2006 annual emission reports submitted to the Illinois EPAby emission sources and the U.S. EPA's CleanAirMarkets Division database for electric utilities. Area source emissions were "grown" from 2002 activity levels appropriate for each source category. Biogenic emissions are not included in these summaries. On-road mobile source emissions were calculated using U.S

. EPA's MOBILE6 emissions model with vehicle miles traveled (VM1) data provided by the Illinois Department ofTransportation (IDOT). Non-road mobile source emissions were calculatedusing U.S. EPA's NONROAD emissions model. Table 4.1 summarizes the 2006 emissions estimates for the Chicago ozone nonattainment area..
Table 4.1 2006 Chicago Ozone NonattainmentArea YOM and NOx Emissions (Emissions stated in tons per ozone season weekday) Source Category YOM NOx Point Sources 61.20 194.03 Area Sources 281.43 35.64 On-Road Mobile Sources 130.03 302.43 Off-Road Mobile Sources 152.90 279.95 Total 625.56 812.05

144.2 Air Quality Improvementand Emission Controls TheChicago area was .designatednonattainment in 2004, based on ozolle air**qu~litympnitoring** data collectedbetween 2001 and2003. Since thattime, permanent and enforceable reductions of ozone precursor emissions have contributed to improvements inozone air quality and to the attainment ofthe ozone NAAQS. Some ofthese emission reductions were due to the application oftighterfederal emission standards on motorvehicles and fuels, and some due to the requirements ofthe federal NQx SIP Call. Section 5.0 ofthis report describes these reductions in more detail, along with an explanation oftheirregulatory status. In this subsection, the emissionlevels from 2006 are compared to emission levels estimated in 2002 when the Chicago area was first proposed for a nonattainment classification for the 1997 8-hourozone standard. u.S. EPA's 8-hour ozone Implementation Rule required that states with ozone nonattainment areas prepare and submit a 2002 base year anthropogenic inventory ofsources ofozone precursor emissions. The base year inventory included emissions from point, area, on-road mobile and off-roadmobile emissions. Illinois EPA prepared and submittedthis inventory in June 2006. Table 4.2 summarizes 2002 emissions by major source category andby pollutant for the Illinois portion ofthe Chicago nonattainment area.



### Table 4.2 2002 Chicago OzoneNonattainmentArea VOM and NOx Emissions (Emissions stated in tons perozone seasonweekday) Source Category 

### YOM NOx Point Sources 76.62 307.73 Area Sources 273.33 42.93 On-Road Mobile Sources 168.63 408.88 Off-RoadMobile Sources 233.77 326.65 Total 752.35 1086.19
Comparing the 2002 inventory to that for 2006 indicates that total YQM emissions in the Chicago area decreasedby about 126 tons per day (tpd), due largely to reductions from on-road and off-road mobile sources. NOx emissions in the Chicago NAA decreased significantly, about 274 tpd, during the same time period. Statewide, NOx emissions decreasedby almost 145 tpd, from 468 tpd in 2002 to 323 tpd 

### in 2006. These sizeable emission reductions 

### in ozone precursor emissions resulted 

### in a substantial improvement in ozone airquality in the Chicago area, ultimately resulting 

### in attainmentofthe 8-hourozone NAAQS.

154.3 Emission Projections
A maintenance plan must contain a demonstration thatthe level ofemissions projected for the ten-year period following redesignation are sufficient to maintainthe ozone NAAQS. Accordingly, Illinois EPA has projected YOM andNOx emissions for the Illinois portion of the Chicago nonattainment area for 2020. Illinois EPA has also projected emissions to 2013, to represent a midpointduring the ten-year maintenance period. Emissions for these two projection years are compared to emission levels in 2006 to determine ifemissions are sufficientto maintain the NAAQS during this period.

- Chicago area point source emissions for 2013 and 2020 were estimated using the 2002 base year inventory and growth factors appropriate for each source category. Area source emissions were projectedby applying category-specific growth factors to estimates contained in the 2002 base year inventory. County populationprojections for 2007 and 2012 were used to estimate emissions for categories which rely on aper capita emissions factors. Off-road emissions projections were also developed using the 2002 inventory and growth factors contained inU.S. EPA's NONROAD model. On-road motor vehicle emissions were estimatedusing U.S. EPA's MOBILE6 motorvehicle emissions model. The figures assume the continueduse of reformulated gasoline, the continued phase-in ofthe Tier 2 motorvehicle emissions standards, and operation ofanenhanced vehicle inspection and maintenance program. Total vehicle miles oftravel (VMT) for 2013 and 2020 were assumed to increase at a rate of1.27 percentperyear from 2002. Tables 4.3 and4.4 include the YOM andNOx emissions estimates for the years 2013 and 2020, respectively, for the Illinois portion ofthe Chicago nonattainment area.



### Table 4.3 

### 2013 Chicago OzoneNonattainmentArea VOM and NOx Emissions (Emissions stated in tons per ozone seasonweekday) Source CateJ1;ory 

### VOM NOx Point Sources 70.27 155.02- Area Sources 266.33

- 37.58 On-RoadMobile Sources 77.58 148.78 Off-RoadMobile Sources 122.82 249.28 Total 537.00 590.66

16

### Table 4.4 2020 

### Chicago Ozone NonattainmentArea YOM and NOxEmissions (Emissions stated in tons per ozone seasonweekday) Source**Cate~orv** 

### YOM NOx Point Sources 81.43 153.12 Area Sources 293.25 39.62 On-RoadMobile Sources 56.07 79.09 Off-Road Mobile Sources 129.15 246.54 Total 559.90

- 511.37

4.4 Demonstration ofMaintenance Table 4.5 demonstrates that the level ofemissions projected for the ten-year period following redesignation is sufficientto maintain the ozone NAAQS. As shown in the table, bothYOM and NOx emissions within the nonattainment area are expected to decrease significantlybetween 2006 and 2020. Projected YOM and NOx emissions for the mid-pointyear, 2013, are also less than the emission levels in 2006. Based on these emissiontrends itis expectedthatair quality will continue to meetthe 8-hour ozoneNAAQS throughoutthe maintenance period.
In addition to the overall emissionreductions projectedto occurwithin the nonattainment area, significantreductions ofstatewide NOx emissions resulting from implementation oflllinois' multi-pollutant standards affecting electric utilities by 2012, will also help to ensure continued attainment ofthe 8-hour ozone NAAQS. Table 4.6 provides a summary ofthe expected reductions ofNqx emissions resulting from implementation oflllinois' multi-pollutant standards.



### TABLE 4.5 Comparison of2006, 2013 

### and 2020 

### Emission Estimates Chicago Nonattainment Area (Emissions stated in tons t erozone season weekda r) 2006 2013 2020 

### YOM 625.56 537.00 559.90

17

### 812.05 

### NOx 590.66 518.37 

# I ----------'"--------

Table 4.6 Estimated NOx Emission Reductions FromUtility Boilers Resulting from Implementation ofIllinois' Multi-Pollutant Standards (Emissions stated in tons J: 

### er ozone seasonweekday) 2006 NOx Emissions 323 2012 NOx Emissions 163 Netreduction 160

4.5 Provisions for Future Updates As requiredbySection 175A(b) ofthe CAA, Illinois commits to submit to U.S. EPA, eightyears afterredesignation, arevised version ofthis Maintenance Plan. The revision will contain ' Illinois' plan for maintaining the 8-hourozone NAAQS for tenyears beyond the first lO-year period afterredesignation.

18

### 5.0 CONTROLMEASURES AND REGULATIONS
This sectionprovides specific infonnation on the control measures implemented in the Chicago nonattainment area, including the measures that were part ofIllinois' Attainment Demonstration, Reasonable FurtherProgress (RFP) demonstration, CAA requirements, and other state and federal measures. The control measures required in past ozone SIP revisions have been fully implemented, and other, more recent control programs will continue to provide emission reductions in future years. Illinois EPA commits to keep these measures in effect after redesignation, orto provide equivalent emissions levels using alternate measures. Illinois' SIP contains acceptable provisions to provide for preconstruction review ofnew emission sources. Afterredesignation to attainment, Prevention ofSignificantDeterioration (PSD) requirements will apply to the construction ofnew major sources and to significantmodifications ofexisting sources. Illinois has accepted delegation from U.S. EPA ofthis program. Illinois further commits to continue to require that all future transportation plans in the Chicago area confonn with the SIP. 5.1 Attainment Demonstration Control Measures Illinois' attainment demonstration for the Chicago nonattainmentarea identifies control measures thathave beenpromulgated at eitherthe state or federal level that are sufficient to allow the Lake Michigan region, with the exception ofHolland, MI, to meet the 1997 8-hour ozone NAAQSby the required attainment date. The demonstration is described in the Illinois EPA's document: "AttainmentDemonstration for the 1997 8-Hour Ozone National AmbientAir Quality for the ChicagoNonattainmentArea" (ReportNumberAQPSTR 08-07, November 15, 2008). The primary emission reduction measures for demonstrating attainment ofthe ozone standard are as follows:



### o NOx SIP Call



### o New Source Perfonnance Standards (NSPS) andNational Emission Standards for Hazardous AirPollutants (NESHAPS)/MaximumAchievable Control**Te~hnology** (MACT) Standards



### o YOM SolventCategories: Aerosol Coatings, Architectural andIndustrial Maintenance (AIM) Coatings, Consumer Solvents



### o Enhanced Vehicle Inspection & Maintenance Program



### o ReforIlJ.ulated Gasoline



### o Tier 2 MotorVehicle Emissions Standards and Gasoline Sulfur Control Requirements 

### o On-Highway Heavy-Duty Engine and Vehicle Standards and Highway Diesel Fuel Sulfur Control Requirements 19o Federal Control Programs Incorporated into NONROAD Model (e.g., Nonroad Diesel Rule), plus Evaporative Large SparkIgnitionand Recreational Vehicle Standards

o Tier4 Nonroad Diesel Engine Standards and Diesel Fuel Sulfur Content Restrictions

o Marine Compression-Ignition Engine Standards and Locomotive Engine Standards

o Consent Decrees---Dynegy Midwest Generation, ConocoPhillips, CITGO, Exxon-Mobil, Marathon Ashland, ArcherDaniels Midland

5.2 Reasonable FurtherProgressJRFP) Since the Chicago region is classified as a moderate nonattainment area for the 8-hour ozone standard, a 15 percentnet reduction in YOM emissions from 2002 levels is required by 2008 in orderto meet the RFP requirement. The Illinois EPA has not relied on NOx substitutionto meet its 15 perc,ent RFP reduction, relying solely on YOM emission reductions

.

.Reductions in YOM emissions are primarily achieved through implementation ofthe control measures listed in Section 5.1. The RFP demonstration is contained in Illinois EPA's document: "Chicago NonattainmentArea 8;.Hour Ozone and Annual PM2.5 Reasonable Further Progress Demonstration", (Report NumberAQPSTR08-06, November 2008). The control measures identified in the RFP document, including those listed above, will result in a 20.0 percentreduction in YOM emissions from 2002 emissions levels by theyear 2008. In addition, continuing reductions in 2009 and 2010 are estimated to result in year2010 VQMemissions at 23.85 percentbelow 2002 levels. These emission reductions easily achieve the 15% RFP target for the Chicago nonattainment area.

205.3 Reasonably Available Control Technology (RACn Pursuantto Sections 172, I82(b) and (f) ofthe CAA, RACT is required for all existing major sources ofthe applicable criteria pollutant and its precursors (VOM andNOx) located inNAAs. U.S. EPA defines RACT as the lowest emission limitation that aparticular source is capable of llleetingbythe application ofcontrol technology that isreasonably avaIlabie considering technological feasibility and economic reasonableness (70 

### FR 71612; November 29,2005). The major source threshold for moderate NAAs is defined as 100 tpy. A source generally consists of several units that emit pollutants. The sum ofemissions from all units at the source determines if a unit is major and thus subject to RACT requirements. RACT is not a new requirementunderthe CAA. Illinois previously addressed RACT requirements in the Chicago areain developing attainmentplans for the I-hour ozone standard. The RACT requirement for NOxwas previously waived under the I-hour ozone standard, and Illinois must adopt new regulations to implementNOx RACT in the NAA. However, Illinois has previously adopted RACT requirements for YOM emissions in the NAA. (See 35 Ill. Adm. Code Part219) The Illinois EPAhas evaluated the previously adopted regulations to determine ifthe RACT requirement is stillbeing met for 8-hour ozone. Sections 172, 182(b)(2), and 182(f) ofthe CAArequire implementation ofRACT for sources that are subject to Control Techniques Guidelines (CTGs) that are promulgatedbyU.S. EPA. TheU.S. EPA has issued CTGs defining RACT for those categories ofsources thatemit the greatest amounts ofVOM emissions. Illinois EPA will soon be proposing regulations to implementthe revised CTGs issuedby the U.S. EPA in 2006. Otherthan the 2006 CTGs, Illinois has adopted applicable rules addressing all CTGs publishedby U.S. EPA for which there are existing sources in the Chicago NAA. Non-CTG sources are defined as majorYOM sources which are not subjectto CTGs, but for which RACT is required. All major sources ofozone precursors located in the ozone NAA that are not subject to individual RACTrules are subjectto a generic RACT rule. These rules apply to non-CTG sources thathave the potential to emit 100 tons ormore peryear ofVOM. Thus, Illinois has metthe obligation to implement RACT on non-CTG YOM sources in the NAA. 

### It shouldbe noted that otherregulatory requirements also affectYOM emission sources within the Chicago ozoneNAA. These include Maximum Achievable Control Technology (MACT), federal New Source Performance Standards (NSPS), andNational Emission Standards for Hazardous AirPollutants (NESHAPS). These programs satisfy the RACT requirements for specific source categories because these rules are more stringentthan RACT. It is concluded from this review thatIllinois' existing YOM RACT rules fulfill U.S. EPA's RACT requirements for YOM sources in the NAA. As mentionedpreviously, however, the RACT requirement forNOx waspreviously waived underthe I-hourozone NAAQS. With respect to the 8-hour ozone NAAQS, Illinois will notpursue the NOx waiver, so Illinois must adoptnew regulations to implementNOx RACT in the NAA. The Illinois Pollution Control Board (Illinois PCB) is now considering a regulatory proposal preparedby the Illinois EPA. The 21

### Illinois EPA will submitIllinois' NOx

### RACT rules as a SIP revision once these requirements have been adoptedby the Illinois PCB. 5.4 Controls to Remain in Effect Illinois will maintain all ofthe control measures listed in this Sectionto ensure maintenance of the 8-hour ozone NAAQS. Anyrevisions to the control measures included as part ofthe Maintenance Plan will be submitted as a SIP revision to U.S. EPA for approval, and will be accompaniedby a showing that such changes will notinterfere withmaintenance ofthe NAAQS. Illinois EPA has the necessary resources to enforce any violations ofits rules orpermit provisions. Afterredesignation, it intends to continue enforcing all rules thatrelate to the emission ofozone precursors in the Chicago nonattainment area. 5.5 Provisions for PermittingNew orModified Emission Sources Illinois has longstanding and fully implementedprograms for the review ofnew major sources and significantmodifications ofexisting sources. The Prevention ofSignificantDeterioration (PSD) program, which includes requirements forBestAvailable Control Technology (BACT) on majornew sources or significantmodifications ofexisting sources, will be applicable in the Chicago area once the area has been redesignatedto attainment. Illinois has been delegated full authority to implementthe PSD programby U.S. EPA.

5.6. Transportation Conformity The purpose ofthis section is to describe and establish the Chicago nonattainment area motor vehicle emissions budgets associated with the 8-hourozone Maintenance Plan SIP

. Average summerweekday motorvehicle emissions budgets are beingproposed for the final yearofthe Maintenance Plan, 2020, and fortheprecursorpollutants YOM and NOx. Thesebudgets were developed consistentwith the motorvehicle activity assumptions and emissions control strategies incorporated'into the 8-hourozone attainmentdemonstration analysis. Thebudgets reflect an emissions level determined using motorvehicle VMT and fleet mix providedby the Chicago MetropolitanAgency for Planning (CMAP) and are consistentwith the emission levels used in the attainmentdemonstration. A motorvehicle emissions budget is thatportion of

### the total allowable emissions allocated to highway and transitvehicle use that are defined in the SIP for acertain year. The rules governing transportationconformity require certaintransportation activities to be consistentwith motorvehicle emissions budgets contained in control strategy implementationplans (40 CFR § 

### 93.118). Section 93.101 ofthe rule defmes a "control strafugy [State] implementation plan revision" as a "planwhich contains specific strategies for controllingthe emissions and reducing ambientlevels ofpollutants in orderto satisfy CAArequirements ofreasonable further progress and attainment." In 

### orderto demonstrate conformity to the motorvehicle emissions budget, emissions from the implementation ofatransportation plan oratransportation improvement 22

### programmustbe less than orequal to the budget level (40 CFR § 93.118(a)). The motorvehicle emissions budgets established and described herein were developed consistent withthe methodology and control strategy assumptions used in the 8-hourozone attainment demonstration. The effects ofmotorvehicle control measures are incorporated into the emissions factors producedbythe U.S. EPA's MOBILE6 model. These control measures include motorvehicle emissions standards, the operation ofavehicle inspection and maintenance (11M) program, and the required use ofreformulated gasoline and low sulfur gasoline and diesel fuel. Using the above VMT and controlprogram assumptions and methodology, following are the year 8-hourozone motorvehicle emissions budgets, statedin tons perozone seasonweekday, for the Chicago NAA for use in 

### determining transportation conformity. Table 5.1: Proposed Chicago NAA Year 2020 Motor Vehicle Emissions Budgets 8-Hour Ozone 

### (tons perozone season weekday) Pollutant

VOM 

### 56.07 NOx 

### 79.09 .'


### Complete detail onthe derivation ofthe motor vehicle emissions budgets, including discussion ofthe MOBILE6 model inputs and aSsumptions is included in AppendixB ofthis report.

236.0 

### CONTINGENCY MEASURES

6.1 Contingency Measures Section 175(A) ofthe CAA specifies the requirements for maintenance plans, including provisions for contingency measures that will be implemented ifviolations ofthe 8-hour ozone NAAQS are measured afterredesignation to attainment. A list ofpotential contingency measures that would be implemented in such an event should also be included in the Maintenance Plan. Finally, the plan should provide a commitmentto submitarevised maintenance plan eight years afterredesignation to ensure continued maintenance for the next ten-yearmaintenance period. Contingency measures are intended to provide further emission reductions in the eventthat violations ofthe 8-hour ozone NAAQS occurafterredesignation to attainment. While these measures do notneed to be fully adopted by the IPCB priorto the occurrence ofNAAQS violations, the contingency plan should ensure that the contingency measures are adopted expeditiously once they are triggered. The Maintenance Plan must identify the triggers that determine when contingency measures will be adopted, and the measures thatthe state will consider. lllinois EPA's contingency plan for the Chicago NAA is described in Table 6.1. Consistent with this plan, lllinois agrees to adopt and implement, as expeditiously as is practicable, the necessary corrective actions in the event thatviolations ofthe 8-hour ozone NAAQS occurwithin the Chicago maintenance area afterredesignation to attainment. Further, lllinois commits to continue to implementthe control measures identified in the attainment demonstration and RFP demonstration. As described in Section 5.0 ofthis report, lllinois has adopted and is continuing to implement arange ofcontrol measures that will greatly reduce precursoremissions, both locally and statewide. The contingency plan anticipates that these emissionreductions will be sufficient to mitigate exceedances orviolations ofthe NAAQS that may occurin the coming years without further regulatory action. The contingency plan prov,ides for different levels ofcorrective responses should ambient 8-hour ozone levels exceed the NAAQS in any year, ifemissions in the NAA increase significantly above current attainmentlevels, or ifthe NAAQS is violated. A Level 

### I response would occur in the eventthat: 1) the 8-hour ozone design value at any monitoring site in the Chicago NAA exceeds 84 ppb in any year, or 2) ifVOM orNOx emissions increase more than 5% above the levels contained in theattainmentyear (2006) emissions inventory. It shouldbe noted thatU.S. EPA does notrequire a state to implement contingency measures when occasional exceedances are recorded. !EPA's voluntary commitmentto initiate a Level I response is intended to prevent future violations oftheNAAQS from everoccurring. lllinois commits to compiling YOM and NOx emissions inventories every three years for the duration ofthe Maintenance Plan to facilitate the emissions trends analysis included in the contingency plan under Level I. lllinois will coordinate with LADCO and otherLake Michigan 24

### Table 6.1 Contingency Plan for the Chicago 8-Hour Ozone NonattainmentArea Contingency Measure Action to be Taken List ofPotential Contingency Measures Trieeer Level I Trigger Point Source Measures IL will evaluate airquality, or 

### • IL Multi-Pollutant Program for 

### • Monitored ambient determine ifadverse emissions trends electric generating units ozone design value are likely to continue. Ifso, IL will 

### • Reinstate requirements for Offsets exceeding 84 ppb in determine what and where controls may andlorLAER any year at any be required, as well as level of 

### • Apply RACT to smaller existing monitoring station in emissions reductions needed, to avoid a sources the Chicago violation ofthe NAAQS. The study 

### • Tighten RACT for existing maintenance area. shall be completed within 9 months. If sources covered by US EPA necessary, control measures shall be CTGs. adopted within 18 months of 

### • Expanded geographic coverage of 

### • The Chicago determination and implemented as NOxRACT maintenance area's expeditiously as practicable, taking into MACTcontrols for industrial

### - 

### • NOxorVOM consideration the ease of sources emissions inventories implementation and the technical and 

### • Othermeasures to be identified increase more than economic feasibility ofthe selected 5% above the levels measures. Mobile Source Measures included in the 2006 

### • , Tier 2 Vehicle Standards and Low emissions inventories. SulfurFuel 

### • Heavy Duty Diesel Standards and Level II Trigger IL will conduct athorough analysis to Low Sulfur Diesel Fuel 

### • A violation ofthe determine appropriate measures to High-enhanced 11M (OBDII) 

### • NAAQS at any address the cause ofthe violation. 

### • California Engine Standards monitoring station in**Analy~is** shallbe completed within 6 

### • Othermeasures to be identified the Chicago months. Selectedmeasures shall be maintenance area. implemented within 18 months ofa Area Source Measures violation. 

### • ArchitecturallIndustrial Maintenance (AIM) Coatings 

### • Commercial and Consumer Products



# . • Aerosol coatings 

### • Broadergeographic applicability ofexisting measures 

### • Othermeasures to be identified



### states to evaluate the causes ofhigh ozone levels orthe emissions trends andto determine appropriate control measures needed to assure continued attainment of8-hourozoneNAAQS. UnderLevel I, measures that could

# bi implemented in a shorttime wouldbe selected so as to be inplace quickly afterthe Illinois EPA is aware that corrective measures havebeen triggered. Control measures selectedunderLevel Iwill be adopted in mostcases within 18 months after a determination is made, and implemented, generally, within 24 months ofadoptionby the IPCB.
25A Level II response wouldbe implemented in the eventthat a violation ofthe 8-hour ozone NAAQS were to be measured at a monitoring site within the Chicago maintenance area. In order to select appropriate corrective measures, Illinois will work with LADCO and otherLake Michigan States to conduct a comprehensive study to determine the causes ofthe violation and the control measures necessary to mitigate the problem. The analysis will examine the following factors:

• the number, location, and severity oftheambient ozone concentrations;

• the weatherpatterns contributing to ozone levels;

• potential, contributing emissions sources;

• the geographic applicability ofpossible contingency measures;

• emissions trends, includingtimeliness ofimplementation ofscheduled control measures;

• current and recently identified control technologies;

• air quality contributions from outside the maintenance area. Contingency measures will be selected from those listed in Table 6.1 orfrom any othermeasure deemed appropriate and effective atthe time the selection is made. This listofcontingency measures is comprehensive, and it is expected that only a few ofthese measures wouldbe required. The selectionbetweenmeasures will be based upon cost-effectiveness, emission reduction potential, economic and social considerations, ease and timing ofimplementation, or other appropriate factors. Implementation ofnecessary controls in response to a Level II trigger will take place as expeditiously as possible, but in no event laterthan 18 months afterlllinois makes a determination, based onquality-assured ambientdata, that a violation ofthe NAAQS has occurred. Adoption of**addition~l** control measures is subject to necessary administrative and legal processes. lllinois EPA will solicit input from all interested and affected persons in the area priorto selecting appropriate control measures. No contingency measure will be implemented without providing the opportunity for full public participation. This process will include publication ofnotices, an opportunity forpublic hearing, and othermeasures requiredbyIllinois law. Should additional control measures be necessary, suchrules would be adopted pursuantto Section 28.5 ofthe Illinois Environmental Protection Act, Illinois' provisions for fast-track rulemaking (415 ILCS 5/28.5). Section 28.5 enables suchrules to be adopted within twelve months ofproposal to the Illinois Pollution Control Board.

6.2 Commitmentto Revise Plan As noted in Section4.5 above, Illinois commits to review its Maintenance Plan eightyears after redesignation, as requiredby Section 175(A) ofthe CAA. The Maintenance Plan revision is intended to ensure continued attainmentofthe 8-hour ozone NAAQS for an additional ten-year period. 

### 26

### 6.3 Public Participation
In accordance with Section 1l0(a)(2) ofthe eAA, Illinois is required to hold apublic hearing priorto adoption ofthis Maintenance Plan and submittal to U.S. EPA. Public participation in the SIPprocess is provided for as follows:

• Notice ofavailability ofthe Maintenance Plan documentand the time and date ofthe public hearing was published in the local papers for the Chicago nonattainment area on November 15,2008.

• The public hearing to receive comments on the Maintenance Plan is currently scheduled for December 16,2008. A summary ofthe comments received and Illinois EPA's responses thereto will be included as partofthe submittalto U.S. EPA. 6.4 Legal Authority to Implementand Enforce The Maintenance Plan must contain a demonstration thatthe State ofIllinois has the necessary legal authority to implementand enforce the measures relied upon to 

### attain and maintain the NAAQS. Illinois has the legal authority to implement and enforce the requirements ofthis SIP submittalpursuantto the Illinois Environmental Protection Act.

27

### 7.0 CONCLUSIONS The Chicago nonattainment area has attained the 8-hourozoneNAAQS and complied with the applicable provisions ofthe Clean Air Act required ofsevere ozone nonattainment areas. Illinois has submitted, and U.S. EPA has approved, an attainment demonstration, that was based on air quality modeling and contains enforceable control measures. TIlinois has performed an analysis that demonstrates thatthe Chicago NAA has attained the 8-hourozone NAAQS and believes the air quality improvements are due to permanent and enforceable control measures. Supporting documentation is contained herein. TIlinois has prepared a Maintenance Plan that meets the requirement ofthe Clean AirAct. This Maintenance Planprovides for the continued attainment ofthe 8-hourozone NAAQS for a period often years afterU.S. EPA has formally redesignated the area to attainment. This Maintenance Planprovides adequate contingency measures forpotential, additional emission reductions in the event thatfuture violations ofthe 8-hour ozone NAAQS are observed in the area. TIlinois has prepared a comprehensive emission inventory_ofthe precursors ofozone completed for the "attainmenf' year2006, and has prepared aprojection ofthe emission inventory to a year at least 10 years following redesignation. These projections indicate that emissions levels in the Chicago nonattainment area will continue to decrease, thereby maintaining the ozone NAAQS infuture years. Illinois commits to continue to operate an appropriate monitoring networkto verify the maintenance ofthe attainment status once the area has beenredesignated. TIlinois EPA has the legal authority to implement and enforce all control measures. This Maintenance Planhas beenprepared in accordance with the requirements specified in U.S. EPA's guidance document, and additional guidance received from U.S. EPA staff.



### 28

## APPENDIX A 

## Summary ofAmbientAir MonitoringData (2006-2008)

29

### Table A.I 2006-2008 8-hour Ozone Design Values for Monitors in the Lake Michigan Region

# *
State ofIllinois County AQS Code Site Name· Design Value 4th High 2006 4th High 2007 4th High 2008

Cook 170310001 Alsip 76 78 85 66 Cook 170310032 Chicago (SWFP) 74 75 82 67 Cook 170310064 Chicago (U. of Chicago) 70 70 79 63 Cook 170310072 Chicago (Jardine) 67 65 75 63 Cook 170310076 Chicago (CornED) 73 75 80 66 Cook 170311003 Chicago (Taft) 73 77 79 64 Cook 170311601 Lemont 75 70 85 71 Cook 170314002 Ciceoro 62 60 68 60 Cook 170314007 Des Plaines 66 65 78 57 Cook 170314201

. Northbrook 70 68 76 66 Cook 170317002 Evanston 70 72 80 58 DuPage 170436001 Lisle 63 62 72 57

Kane

... 

### . 170890005 Elgin 66 62 75 61 Lake 170971002 Waukegan 71 71 81 63 Lake 170971007 Zion 72 68 80 69 McHenry 171110001 Cary 65 57 74 65

Will 171971011 Braidwood 66 68 71 60 

### State ofIndiana County AQS Code Site Name Design Value 4th High 2006 4th High 2007 4th High 2008 Elkhart 180390007 Bristol 72 67 82 68

Lake 180890022 Gary 73 73 85 62 Lake 180890030 Whiting 76 81 88 61 Lake 180892008 Hammond 73 75 77 68 La Porte 180910005 Michigan City 69 75 73 59 La Porte 180910010 La Porte 70 69 78 65

Porter 181270026 Valparaiso 70 71 80 61 St. Joseph 181410010 Potato Creek St Park 69 69 75 63 st. Joseph 181411007 Granger 73 70 82 69

• All data for 2008 are preliminary and subject to final verification. Fourth highvalues for 2008 valid thru 10/14/08 for I11inois, 9124/08 for Indiana, 9130/08 for Michigan, and 9129/08 for Wisconsin.



### 31

### State ofMichigan 4th High 2007 4th High 2008 County AQS Code Site Name Design Value 4th High 2006 Allegan 260050003 Holland 86 91 94 73 Benzie 260190003 Frankfort/Benzonia 76 80 82 66 Berrien 260210014 Coloma 78 76 86 73 Cass 260270003 Cassopolis 75 73 83 71 Kalamazoo 260770008 Kalamazoo 73 68 81 70 Kent 260810020 Grand Rapids 77 82 84 66 Kent 260810022 Evans/Oakfield 78 81 85 69 Leelanau 260890001 Peshawbestown 71 73 79 62

Mason 261050007 Scottville 75 76 83 68 Missaukee 261130001 Houghton Lake 71 " 73 76 66 Muskegon 261210039 Muskegon 82 90 86 72

Ottawa 261390005 Jenison 79 83 88 67 Schoolcraft 261530001 Seney 75 76 85 64 

### State ofWisconsin County AQS Code Site Name Design Value 4th High 2006 4th High 2007 4th High 2008 Brown 550090026 Green Bay 70 66 82 63 Door 550290004 Newport Beach 80 79 92 69 Kenosha 550590019 Chiwaukee 78 79 85 72 Kewaunee 550610002

. Kewaunee 75 77 85 65 Manitowoc 550710007 Manitowoc (Two Rivers) 76 78 85 65 Milwaukee 550790010 Milwaukee (16th St.) 63 64 67 60 Milwaukee 550790026 DNR SE Region 68 68 75 63 Milwaukee 550790041 Milwaukee (UWM-North) 72 73 78 65 Milwaukee 550790085' Milwaukee (Bayside) 75 73 83 69 Ozaukee 550890008 Grafton 72 71 82 64 Ozaukee 550890009 Harrington Beach 74 72 84 67

Racine 551010017 Racine 71 71 77 65 Sheboygan 551170006 Sheboygan 82 83 88 75 Walworth 551270005 Lake Geneva 70 72 75 64 Washington -"'''';>. 551310009 Slinger 65 66 71 60 Waukesha 551330027 Waukesha 66 67 72 60

* All data for 2008 are preliminary and subjectto final verification. Fourth highvalues for 2008 valid thru 10114/08 for Illinois, 9124/08 for Indiana, 9130/08 for Michigan, and 9/29/08 for Wisconsin.



### 32

## APPENDIXB Transportation Conformity

33

### Transportation Conformity This section describes the development ofthe Chicago nonattainment area motor vehicle emissions budgets associated with the Maintenance Plan for the redesignation request for the 1997 8-hourNAAQS. An average summer weekday motorvehicle emissions budget is being proposed for the year 2020 for the precursor pollutants volatile organic material ("VOM") and oxides ofnitrogen ("NOx"). These budgets were developed consistent with the motorvehicle activity assumptions (e.g., fleet mix, registration distribution

...) and emissions control strategies incorporated into the 8-hourozone attainment demonstration analysis.


### Background Section 176(c)(4) ofthe Clean AirActAmendments of1990requires thattransportation plans, programs, and projects which are funded or approved underTitle 23 USC mustbe determined to conform with State orFederal air implementation plans, A motor vehicle emissions budget is thatportion ofthe total allowable emissions allocated to highway and transitvehicle use that are defined in the SIP for a certain year. Section 93.1 01 ofthe rule defines a "control strategy [State] implementation plan revision" as a "plan which contains specific strategies for controllingthe emissions andreducing ambientlevels of pollutants in orderto satisfy CleanAirAct ("CAA") requirements ofreasonable further progress and attainment." In orderto demonstrate conformity to the motorvehicle emissions budget, emissions from the imple.mentation ofa transportation plan or a transportation improvementprogram ("TIP") mu.stbe less than or equal to the budget level (40 CFR 

### § 93.118(a».
Transportation conformity will be based on these submitted on road motorvehicle emissions budgets after the U.S. Environmental Protection Agency ("USEPA") determines that the budgets meet the adequacy criteria ofthe transportation conformity 

### a rule under §93.118(e). The motorvehicle1emissions budgets in this submittal are adequate as each ofthe six criteria under §93.118(e) is satisfied. These six criteria include:

341. The submitted control strategy implementationplanrevision ormaintenance plan was endorsedby the Governor(orhis orher designee) and was subject to a State public hearing.

2. Before the control strategy implementationplan ormaintenance plan was submitted to EPA, consultation among federal, State, and local agencies occurred: full implementationplan documentation was provided to [US]EPA; and [US]EPA's stated concerns, ifany, were addressed;

3. The motorvehicle emissions budgets(s) is clearly identified andprecisely quantified;

4. The motorvehicle emissions budget(s), when consideredtogetherwith all other emission sources, is consistentwith all applicable requirements forreasonable further progress, attainment, ormaintenance (whichever is relevant to the given

. implementationplan submission);

5. The motorvehicle emissions budget(s) is consistentwithand clearly relatedto the emissions inventory and the control measures in the submitted control strategy implementationplanrevision ormaintenance plan, and

6. Revisions to previously submittedcontrol strategy implementationplans explain and document any changes to previously submittedbudgets and control measures, impacts onpoint and area source emissions; any changes to established safety margins; and reasons for the changes (includingthe basis for any changes related to emission factors orestimates ofvehicle miles traveled).

This State Implementation Plan and the associated motorvehicle emissions budgets have been developed by the Illinois EPA, the designated airquality agency for the State of Illinois. The required publichearing to acceptpublic comment on theproposed motor vehicle emissions inventory will be held at 9:00 AM, onDecember 16, 2008 in Room 9- 031 ofthe James 

### R. Thompson Center in downtown Chicago. Notification ofthis hearing was printed in the Chicago SunTimes onNovember 15, 2008. Comments on the proposed attainment demonstration andmotorvehicle emissions budgets willbe accepted for 30 days afterthe public hearing. A "Responsiveness Summary" which



### 35

# ..

addresses the written comments received will be prepared and included in the final submission

In compliance with adequacy criterion #2, aTier 2 Conformity Consultation Team meeting has been requested to discuss the proposed Maintenance Plan and associated motorvehicle emissions budgets. The consultation Teamincludes representatives from the Federal Highway Administration, Federal TransitAuthority, U.S. EPA, Chicago Metropolitan Agency for Planning, Illinois Department ofTransportation, Regional Transportation Authority, and the Illinois EPA. In addition, the development ofthe Maintenance Plan was discussed at lengthby the LADCO ProjectTeam, which includes
a**repres~l}tative** from theU.S. EPA Region V office. The draftMaintenance Plan is also being forwarded to the Region V representative for his review and comment. Compliance with the remaining adequacy criteria is contained within the narrative ofthe attainment demonstration document and this transportation conformity section.



### The 8-Hour Ozone Maintenance Plan As previously

### d~scribed, air quality monitoring results from 2006 to 2008 in the lower Lake Michigan area indicates thatthe Chicago nonattainmentareahas attained the 8-hour
ozone standard promulgated in 1997. This draftMaintenance Plan includes nonattainment area emissions estimates for all emissions sectors for the attainmentyear, 2006 and for the**~ast** year ofthe proposed maintenance year2020. The Maintenance Plan



# . must demonstrate that emissions throughout the Maintenanceplantime frame are less than emissions in the**~ttainment** year. The motorvehicle emissions estimate in the final year ofthe maintenance planis also established as a cap, or "budget", for us in the transportation conformity process.

The m?torvehicle emissionsbudgets established and describedherein were developed considtentwiththe methodology and control strategy assumptions used in the 8-hour
ozone AttainmentDemonstrations as well as the 8-hour ozone RFP plan. The effects of these controls are incorporated into the emissions factors producedby the USEPA's MOBILE6 model. Following is a discussion ofthe inputs and assumptions incorporated



### 36into the developmentofthe proposed Maintenance Plan motorvehicle emissions budgets.

Vehicle Miles Traveled The RFP plan described in Attainment Demonstration incorporates county-level base year 2002 average daily vehicle miles traveled (ADVMT) levels from the TIlinois Department ofTransportation (IDOT). The 2002 ADVMT total for the 6-county-3- township Chicago NAA was approximately 160.8 million miles. This total was projected to the attainmentyear 2009 using an area-wide vehicle miles traveled (VMT) growth rate of 1.27 percentperyear, determined through consultationbetween the TIlinois EPA, CMAP, and LADCO. This growth rate has also been applied to projectyear2020 VMT. Using this growth rate, the projected 2020 ADVMTlevel for the Chicago NAA was 201.8 million miles. To account for ozone seasonweekday traffic, the average daily VMT estimates were multipliedby Chicago area and facility type -specific AverageDaily-to-Average SummerWeekday conversion factors suppliedby mOT. Applying these factors resulted in an average summerweekday VMT *(ASWVMT) thatis 11.3 percent greaterthan the average daily VMT. Applying this ·11.3 percent factoryields a year 2020 ASWVMT total of224.6 million. Following is a summary ofthe information and MOBILE6 model assumptions used included in the development ofthe draftmotor vehicle emissions budgets.

Year: VMT estimates and motorvehicle emissions factors**~ere** developed representative ofsummer2020
Typical Ozone Season Weekday: The 2002 Chicago Area ozone precursoremissions inventory, which established the baseline for the CAA-required RFP emissions reductions, is based on activity on a typical ozone season weekday. The primary parameters affectedby this choice oftemporal time frame are the temperature andthe adjustment ofVMT to account for increased travel during the summer. 

# ..

Temperature: u.S. EPA guidance for the use ofthe MOBILE6 model calls for

37the use ofrepresentative summer daily temperatures. For future years, the representative
summertemperatures are the National Weather Service's climatological average minimum and maximum temperatures at Chicago's O'Hare Airport for the summer monthsofJune, July, and August. Those are 61°F and 81 

### of, respectively.



### Absolute Humidity: U.S. EPA guidance calls for the use ofthe lowest absolute humidity on days corresponding to the summerclimatological temperatures in the region
as calculated from local climatological datapublishedby the National Weather Service. A climatological average Summerweekday absolute humidity value of97 grains ofwater
. (vapor) perpound ofdry air was calculated for O'Hare Airport.



### Motor Vehicle Emission Controls: The primary motor vehicle emission control programs thatwill be inplace in the Chicago NAA in 2020 are (1) an OBD-II-based vehicle emissions testing program, and the requirementthat gasoline sold in the areabe "reformulated gasoline", fuel that is specially formulated to reduce emissions.


### Inspection and Maintenance (11M): The

## 11Mprogram in effect since 2007 requires biennial On-Board Diagnostics (OBD) testing on all model year (MY) 1996 andnewer(MY96+) light duty gasoline vehicles, and biennial exhaust idle and gas cap testing on MY96+ heavy duty gasoline vehicles including gasoline-poweredbuses, registered in the 

### 11M area**(~e** "testable area"). The program includes a 4 year grace period for new vehicles. This post-2007 

### 11M. program was established afterthe Illinoislegislature amended the Illinois Vehicle Inspection law in2005 to (a) drop dynamometertesting ofvehicles, 

### (b) require an OBD-basedprogram beginning in February 2007, and (c) remove the requirement for testing compliantpre-MY-1996 vehicles. (Motorcycles and diesel vehicles
are not subjectto IIM.)

The Chicago testable area is based upon urbanized areas and includes all ofCook, DuPage, and Lake Counties, and parts ofKane, McHenry, Will, and Kendall Counties. Some ofthe VMT in the Chicago testable area is generatedby vehicles



### 38that come from outside the testable area and are therefore notrequired to undergo lIM testing. Conversely, some VMT in an area without liM (such as Grundy County's NAAtownships) may be generatedby lIM vehicles from a neighboring testable area. The VMT estimates used when calculating lIM emission credits for
a county ortownship mustbe adjustedto reflect VMT from vehicles subject to liM only. This is done using liM coverage factors derived ultimately from transportation modeling outputs. (11M Credits are subtracted from emissions calculated assuming no lIM to give Net Emissions with liM.) The coverage factors are 98% for Cookand DUPage Counties (thatis, 98% ofthe gasolinevehicle VMT in the county is from vehicles subject to lIM) , 95% for Lake County, 81% for Kendall County's NAA township, 65% for Will County, 60% for Kane County, 50% for McHenry County, and 25% for Grundy County's NAA townships.

Fuels: Reformulated gasoline (RFG) has been required in the Chicago NAA since 1995. The attainment demonstration.and RFP planboth assume all gasoline sold in the Chicago NAA since 1995 is ''Northern'' RFG, and thatthis will continue through and beyond 2008 and 2009. Although a small amount ofnon-RFG fuel comes into the NAA in the fuel tanks ofvehicles from outside the area, it is assumed that the use ofnonreformulated gasoline fuel inthe Chicago area is negligible.

Gasoline Sulfur: Gasoline sulfurlevels were assumed to be 30 parts permillion (ppm) in 2020 in accordance with the federal Tier 2 gasoline regulations which required the 30 ppmlevel beginning in 2006.

Diesel Sulfur: Diesel sulfurlevels were assumed to be 15 parts permillion in 2020 in accordance with the U.S. EPA's Highway Diesel Rule which was finalized in January 2001. This regulation required the sale ofon-road diesel fuel withno greaterthan 15 ppm ofsulfurbeginning in June 2006.

39

### Speeds: Forthe Chicago area, the Illinois EPA assumed an area-specific vehicle speed distribution that appears in the VMT-by-Speed-Bin external file SVMTCH07.DEF, which is described in more detail later in this document. The speed distribution in this

.file is for freeways and arterials only (local roads andramps have a fixed speed in MOBILE6), and was based on transportation model output (modeled speeds onlinks of various classes ofroads by modeling period) from CMAP (CATS) for the year 2007 (the mostrecent available). This speed distribution is assumed valid for 2020 as well.

VMT Mix: Theregional VMT mix inputs used for 2020 were based on Chicago-areaspecific 2005 VMT-by-vehicle-type data suppliedby IDOT, modified to reflect expected changes in the ratio ofcars to lighttrucks. This informationis used in the MOBILE_ model to compute the average emission factors for certain combined vehicle classes, and the all-vehicle emissionrate.
Registration Distribution: A Chicago-area-specific vehicleregistration distribution profile based upon 2003-04 information data was supplied by Illinois EPA's Division of

. Mobile Source Programs from data providedby the Illinois Secretary ofState's Department ofMotorVehicles.

Emissions Computation: Illinois EPA calculates emissions budgets using the following formula:

1. No-11M County Emissions by vehicle type (VT) and functional class (FC)



## =(County ASWVMTby FC) * (VMT Mix byVT andFC) * No-11M emission factors 

### (EF) bypollutant, VT, and FC) 

# * 1.102 (grams to tonconversion factor). Forareas without 11M, this is the only calculation.

2. 11M Credits by VT andFC

## =(County ASWVMT by FC) 

# *(VMT Mix by VT andFC) 

## * (No-11M EF

- 

### 11MEF [bothby pollutant, VT, and FC]) 

## * 11M coverage factor

## * 1.102. This is for areas with 11M only.

403. Net County Emissions by VT and FC

## =(11M County Emissions byVT and Fe)

- liM Credits by VT and FC. This is for areas with lIM only.

The Illinois EPA performs these above calculations on a multi-page spreadsheetwhich automatically calculates emissions and IIM credits by county ortownship for each pollutant, VT, andFC, sums themby VT and FC, and aggregates them into area totals. AttachmentA ofthis sectionprovides additional details on the MOBILE6 model inputs used in the development ofthe 2020 Chicago NAA motorvehicle emissions budgets

.



### .MotorVehicle Emissions Budgets Using the aboveVMT and control program assumptions andmethodology, following are the 8-hourozone motor vehicle emissions budgets for the Chicago area for use in determining transportation conformity.



### Proposed Chicago Area Maintenance Plan

2020 Motor Vehicle Emissions Budgets (tons perozone season weekday)


### Pollutant Emissions

VOM 56.07 NOx 79.09

41

## Attachment A Transportation Conformity

External MOBILE6.2 Inputs:
In the examples ofexternal fIles shownbelow, the actual command lines are boldfaced; the unbolded lines represent comments. The actual text fIles have no such distinction in typefaces. The unbolded lines have been "commented out" and have no effect on the MOBILE model. They maytherefore be omitted, but it is suggested that they remain in the fIles for documentation, and to make the files easierfor the userto read and understand. The comments and other textin the External Files have been shown in the 

### Courier Newtypeface. Actual command lines-the inputs thatMOBILE actually uses-are shown in Courier New Bold
In certain cases (especially the VMT-by-Speed-Bin files) the typeface has been reduced in size so thatthe lines would fit 'Yithin the margins ofthe page. This makes them easier to read.


## VehicleInspection and Maintenance (11M) Program
The External IIM fIles giving the inputs used inthe MOBILE6 model in this exercise were ILLOBDIM.D (for 2002 and through 2006) and IM070N.D (for 2007 and later years). When evaluating IIM credits for 2008, the residual effect ofthe ILLOBDIM program in the summer of'08 is taken into accountby assuming that 75% ofthe vehicle fleet subject to IIM has been tested under the IM070N programby thattime, and that the other 25% have been tested underthe ILLOBDIM in late 2006 and have notyet come up for retesting underIM070N by summyr 2008 (both programs arebiennial). By summer 2009,all vehicles subjectto IIM will have been tested underIM070N, so this question does not arise: the IIM emission rate is simply thatfor the IM070N program.

The IM070N.D File, used for the 2020 target year inventory The external IIM file**I~070N.D** is described below. 

### It represents an IIM program with four components, chiefofwhich is an OBD (on-board diagnostics) test for vehicles of model year (MY) 1996 and newer. The order in which the components appear in the external file is not significant, but they mustbe numbered consecutively. Illinois EPA begins IM070N.D with identifYing comments, and adds other comment lines orblank

42

### lines to make the file easierto read and understand. Programs afterthe first need comparatively few commentsbecause the commands are largely self-descriptive.

* Illinois ENHANCED liM DESCRIPTION

* Filename: IM070N.D

* External input file for Illinois' OBD-only liM program * from 2007 on. * OBD-only applies to light-duty vehicles only; HDVs still get * an Idle Test & Gas Cap Check. * All program start years set to 1986 per U.S. EPA guidance in * "Frequently Asked Questions on MOBILE6" from U.S. EPA/OTAQ.

* This represents the NEW liM program in which only 1996 & * newer vehicles are tested with an OBD test; and the OBD test * applies only to LDVs. * This program came into effect in February 2007.

*------------------------------------------------- * Program description for post MY'96 LDV OBD liM *=====================-===========================

* FIRST liM program--"Evaporativel" OBD for MY 1996+ LDVs 

## *------------------------------------------------- I/M PROGRAM I/M MODEL YEARS I/M VEHICLES

. I/M STRINGENCY

I/M COMPLIANCE I/M WAIVER RATES I/M EXEMPTION AGE I/M GRACE PERIOD 1 1986 2050 2 T/O EVAP OBD 1 1996 2050 1 22222 11111111 1 1 20.0 1 95.0 1 0.5 2.2 '01 data 1 

### 25 1 4



### In each case, the first numberafterthe colonrefers to the VM

### program's

. componentnumber.

I/M PROGRAM : 1 1986 2050 2 T/O EVAP OBD



### Testing began in 1986 and runs into the indefinite future (2050). Theprogram is abiennial test-only (2 

### T/O, here and in otherprogram components) program, inthis case anEvaporative On-Board Diagnostics (OBD) test. The On-Board Diagnostic programin avehicle's engine computerrecords information from sensors inthe engine and fuel system. Indications ofmalfunctions orout-ofspecification operations ofthe engine orfuel and evaporative emission control systems are stored in the 

### engiJ,le computeras "fault codes". An 

### OBD test consists ofplugging a speciallscannerinto an outputjackfrom vehicle's engine computer. The scannerqueries the computer and records any fault codes that the computer's OBD systemhas saved. OBD tests are quick, dependable, and clean, and, ifavehicle fails an OBD test, the fault codes thatthe scanner displays help mechanics diagnose the problem.

43

# ..

lIM MODEL YEARS : 1 1996 2050 This program componentcovers only vehicles manufacturedbetween model year (MY) 1996 (start year) and the indefinite future (MY 2050, the endyear). More and more vehicles arebecoming subject to this test as new vehicles are bought and older (pre-MY-1996) ones are scrapped vehicles. 

### lIM VEHICLES : 1 22222 11111111 1

Only the five light-duty vehicle types (cars [LDGVs], and lighttrucks [LDGTs 1,2,3, and 4]) are coveredby this program component (22222). Heavy-duty gasoline trucks (eighttypes) and gasoline buses are notcoveredby this program component (11111111 1), butratherby Programs 

### 3 and 4, describedbelow. 

### lIM STRINGENCY : 1 20.0

Stringency (exhaust inspection failure rate) is 20%. A Stringency entry is necessary for an Exhausttest, butnot anEvaporative test, so this entry canbe omitted or "commented out". In this Evap test case, itwill be ignoredby the model, butis included for reference. 

### lIM COMPLIANCE : 1 95.0

Compliance rate (tested vehicles as percent ofall vehicles subject to 11M) is 95%' 

### lIM WAIVER RATES : 1 0.5 2.2 '01 data

The Waiver Rate is the fraction oftested vehicles that get awaiver-i.e., do not pass the 11M testbut, becauserepairs cost more than a specified amount, get a certificate ofcompliance. Waiverrate is 0.5% for MY 1980 and earlier vehicles (irrelevantnow thatpre-MY-96 vehicles are not tested), and 2.2% for MY 1981 and latervehicles. These figures are from VIM's actual 2001 waiver statistics, and have beenrepresentative ofthe last few years: 

### lIM EXEMPTION AGE : 1 25**~.** Vehicles olderthan 25 years are not subject tO,this program. This will not

happen until atleast 2021. The default is 25, and the model does not calculate benefits for vehicles olderthan 25 years, so in essence this command has no effect. 

### Itcouldbe omitted, but is included for completeness. 

### lIM GRACE PERIOD : 1 4

Vehicles less than 4 modelyears old are exempt from 11M testing.
Most ofthe inputs to the second and subsequent program components are the same as those for the first program, so the description ofthe components will be abbreviated and summarized as below, rather than aftereach command line as above.

44

## * Second riM program--"Exhaust" OBD for MY 1996+ LDVs 

## *---------------------------------------------------- 

# ..

11M PROGRAM ·I/M MODEL YEARS



### 11M VEHICLES 

### 11M STRINGENCY 

### 11M COMPLIANCE 

### 11M WAIVER RATES 

### 11M EXEMPTION AGE 

### 11M GRACE PERIOD 

## * 2 1986 2050 2 

### TIo OBD 

### 11M 2 1996 2050 2 22222 11111111 1 2 20.0 2 95.0 2 0.5 2.2 

### '01 data 2 25 2 4



### The secondprogram componentis abiennial, test-only Exhaust OBD testfor MY 1996 andlaterLDGVs and LDGTs. In this OBD test, the scannerqueries the vehicle's computerfor fault codes concerning exhaustemissions. Stringency, Compliance, WaiverRates, Exemption Age, and Grace Period are the same as inthe firstprogram. An entry for lIM STRINGENCY (20%) is required for an ExhaustIIMprogram.***-----------------------------------~------------------** 

## * Program description for post MY'96 HDV rdle & 

### GC riM***====================~=================================** 

## * Third riM**program-~HDV** 

### rDLE for MY 1996+ HDVs 

## *------------------------------------------------ 11M PROGRAM 

### 11M MODEL YEARS 

### 11M VEHICLES 

### 11M STRINGENCY 

### 11M COMPLIANCE 

### 11M WAIVER RATES 

### 11M EXEMPTION AGE 

### 11M GRACE PERIOD 3 1986 2050 2 

### Tlo IDLE 3 1996 2050 3 11111 22222222 2 3 20.0 

### 3 95.0 3 1.2 1.5 

### '01 data 3 25 3 4 

### The thirdprogramcomponentis abiennial, test-only Idle test for MY 1996 and laterHDGVs and Gas Buses (222222222). Light-duty vehicles are not subject to this component (11111), butratherto components 1 and 2. Stringency, Compliance, Exemption Age, and Grace Period are the same as in component 1, butthe pre- andpost-MY 1981 WaiverRates (1.2% and 1.5%, respectively), are slightly different fromthose in components 1 and 2. HDGVs are few in number, andmost ofthem are commercialvehicles.



## * Fourth riM program--Gas Cap Check for MY 1996+ HDVs 

## *----------------------------------------------------

45

### liM PROGRAM 4 1986 2050 2 

## Tlo GC 

### liM MODEL YEARS 4 1996 2050 

### liM VEHICLES 4 11111 22222222 2 

### liM COMPLIANCE 4 95.0 

### liM WAIVER RATES 4 1.2 1.5 '01 data 

### liM EXEMPTION AGE 4 25 

### liM GRACE PERIOD 4 4

The fourth program component is a biennial, test-only Gas Cap Checkfor MY 1996 and laterHDVs. Compliance, WaiverRates, Exemption Age, and Grace Period are the same as in the third program. Since a Gas Cap Check is an evaporative 11M test, the 11M STRINGENCY command is not necessary and is not included here. Illinois EPA includes further notes and comments in the 11M file to document it further, as shownbelow:

* NOTES

* This is a standard Illinois lIM input, describing the lIM * program with OBD Only as it is supposed to exist after * January 2007. It is the file to be used for regular M6 * lIM runs for 2007 and future years. * * This file was originally SB397.D, supplied 24.viij.05. * Original SB397.D has been slightly revised by * the addition of comments such as this one. The actual * inputs have not been changed. This was done to put the two * LDV OBD programs (exhaust and evaporative) together, and the * two HDV programs together too. The order of the programs in * the lIM file is not significant and has no effect in M6, but * the programs must be numbered sequentially. * DVIM verified that this file as shown is correctly describes the * lIM program planned for introduction in January '07. *
---------------- * COMPARISON WITH ILLOBDIM.D: * The first three programs in ILLOBDIM.D, covering the idle * test for MY'6B-'81 LDVs, IM240 for 'B1-'95 LDVs, and gas * cap check for MY'6B-'95 LDVs have been eliminated from * IM070N; and the two HOV programs now refer only to MY'96 * and later.

There is no "MYCUTS.D" file associated with IM070N.D, as there was in the previous ILLOBDIM.D file. The old ILLOBDIM.D file is not included here.


## The Registration Distribution P; The Registration Distribution (RD) for a vehicle type is an indication ofthe fraction of the vehicle fleet ofthattype that is made up ofvehicles ofa given age. The following is based on 2003 registration data from the Illinois Secretary ofState's office (ISOS). 

### It and its contents are described in detail in the comments to the file. This

46

### file contains data (commented out so notused) from the 2001 RD file (CHIRD01) for historical andreference purposes. As noted above, those data maybe deleted.
REG DIST
* * This file CHIRD03.D is derived from REGDATA.D, the default MOBILE6 RD file. * This file was created 22.ij .06 by SSL and revised on10.iv.06. The values * shown for LDVs and LDTs are from 2003 ISOS registration data, as given in * RD03ERG.xls. In the 22.ij. version, only LDGV RDs were changed from the * 2002 values, but in the 10.iv. version, the RDs for the four LDT types were * changed to those given in RD03ERG.xls for the Chicago area. * * This file contains Registration Distribution fractions for the 16 vehicle * classes by age for July of any calendar year for the Chicago NAA, based on * 2003/41 gasoline-vehicle age distribution data supplied to IEPA by ISOS, just * as the CHRD01.D file came from I/M test data supplied by DVIM.

* (See C:\SSLFILES\INVEN\RDAGE01.XLS.) Age distribution fractions have been * rounded to 4 decimal places, and some of the RDs from for late years * (typically in the last line--entries 21-25) have at times been modified by * +/- 0.0001 or so as necessary to make the RDs add up to 1.0000.
* * The user is referred to REGDATA.D and to M6 Users Guide Section 2.8.7.1 * p. 63 ff) for more detailed information about the nature of RD files. See * also Section 5.3.2 (p. 169 ff) for information on converting M5b RDs to M6 * RDs. See also \SOURCE\BD20.FOR for default RDs.
* * In this file, the first number in each distribution is an integer that * indicates which of the 16 M6 vehicle classes are represented by the RD in * question. That number is**fol~owed** by 25 age fractions arranged in two rows * of 10 values followed by a row with the last 5 values. (This is similar to * the format used in M5b for RDs.)
* * RDs for all vehicle classes are given in this file. This is· for completeness * even though only those vehicle classes whose RDs were changed from the * REGDATA defaults need to be included in this file. Those that were not * changed, are so noted.
* * It is assumed that the RDs for diesel vehicles are the same as the RDs for * the corresponding gasoline vehicles; in particular, LDDV and LDDT RDs are * assumed the same as LDGV and LDGT RDs. Since the (default) HDV RDs are * based more on diesel vehicles to start with, and HDGVs are many fewer than * HDDVs, especially in the higher weight classes, we feel the HOV RDs * represent both HOGV and HODV reasonably well.
* * Default RDs assumed for the various HOV classes. Good area-specific * HDV age distribution data are lacking--RD03ERG covered only LDVs--and * besides, much Chicago-area HOV VMT is from vehicles registered outside the * Chicago area. The best choice, then, was to go with the HOV defaults; and * similarly with Mes.
* * ---SL * * * M6 LDV 

### = M5 LDV (Light-duty Vehicles--passenger cars--from * RD03ERG.XLS for Chicago

1 0.0603 0.0804 0.0805 0.0818 0.0845 0.0773 0.0673 0.0670 0.0574 0.0620

0.0493 0.0449 0.0388 0.0331 0.0280 0.0233 0.0169 0.0122 0.6089 0.0067 0.0045 0.0025 0.0014 0.0009 0.0101 * The following, commented out, are the CHIRD01 values. *1 0.0548 0.0870 0.0798 0.0735 0.0751 0.0668 0.0775 0.0655 0.0609 0.0565 * 0.0530 0.0505 0.0472 0.0399 0.0295 0.0241 0.0174 0.0114 0.0062 0.0033 * 0.0023 0.0024 0.0030 0.0021 0.0103
* * M6 LDT1 

### = M5 LOT1 from RD03ERG.xls for Chicago

2 0.0796 0.1061 0.1062 0.0532 0.0365 0.0331 0.0358 0.0331 0.0546 0.0569


### 47

# •

0.0676 0.0520 0.0396 0.0516 0.0443 0.0444 0.0300 0.0282 0.0188 0.0103 0.0052 0.0026 0.0021 0.0016 0.0066 * The following, commented out, are the CHIRD01 values * 2 0.0746 0.1128 0.1041 0.1055 0.0886 0.0737 0.0719 0.0694 0.0572 0.0451 * 0.0437 0.0329 0.0333 0.0289 0.0202 0.0140 0.0092 0.0053 0.0024 0.0015 * 0.0011 0.0006 0.0008 0.0006 0.0026 * * M6 LDT2 

### = LDT2 from RD03ERG.xls for Chicago

3 0.0767 0.1023 0.1024 0.1053 0.1024 0.0893 0.0920 0.0766 0.0563 0.0517 0.0434 0.0348 0.0237 0.0157 0.0082 0.0061 0.0061 0.0015 0.0014 0.0010 0.0009 0.0005 0.0003 0.0002 0.0012 * The following, commented out, are the CHIRD01 values * 3 0.0746 0.1128 0.1041 0.1055 0.0886 0.0737 0.0719 0.0694 0.0572 0.0451 * 0.0437 0.0329 0.0333 0.0289 0.0202 0.0140 0.0092 0.0053 0.0024 0.0015 * 0.0011 0.0006 0.0008 0.0006 0.0026 * * M6 LDT3 

### = LDT3 from RD03ERG.xls for Chicago

4 0.0674 0.0899 0.0900 0.0830 0.0867 0.1041 0.0614 0.0594 0.0433 0.0571 0.0479 0.0391 0.0303 0.0218 0.0232 0.0236 0.0185 0.0130 0.0092 0.0066 0.0049 0.0031 0.0017 0.0005 0.0143 * The following, commented out, are the CHIRD01 values * 4 0.0629 0.1095 0.1300 0.0889 0.0835 0.0624 0.0725 0.0611 0.0455 0.0388 * 0.0300 0.0348 0.0387 0.0313 0.0236 0.0225 0.0161 0.0123 0.0076 0.0034 * 0.0017 0.0032 0.0074 0.0049 0.0074 * * M6 LDT4 

### = LDT2 from RD03ERG.xls for Chicago

5 0.0695 0.0926 0.0927 0.1167 0.1127 0.1290 0.0953 0.0753 0.0561 0.0505 0.0405 0.0135 0.0137 0.0049 0.0065 0.0041 0.0035 0.0024 0.0042 0.0029 0.0017 0.0010 0.0003 0.0002 0.0102 * The following, commented out, are the CHIRD01 values * 5 0.0629 0.1095 0.130Q 0.0889 0.0835 0.0624 0.0725 0.0611 0.0455 0.0388 * 0.0300 0.0348 0.0387 0.0313 0.0236 0.0225 0.0161 0.0123 0.0076 0.0034 * 0.0017 0.0032 0.0074 0.0049 0.0074 .'

* * HDV2B (Heavy-duty vehicles 2B--M6 Default RDs)

6 0.0503 0.0916 0.0833 0.0758 0.0690 0.0627 0.0571 0.0519 0.0472 0.0430

0.0391 0.0356 0.0324 0.0294 0.0268 0.0244 0.0222 0.0202 0.0184 0.0167 0.0152 0.0138 0.0126 0.0114 0.0499 * HDV3 (Heavy-duty vehicles3, same RD as HDV2B, M6 Default RDs)

7 0.0503 0.0916 0.0833 0.0758 0.0690 0.0627 0.0571 0.0519 0.0472 0.0430 0.0391 0.0356 0.0324 0.0294 0.0268 0.0244 0.0222 0.0202 0.0184 0.0167 0.0152 0.0138 0.0126 0.0114 0.0499 * HDV4 (Heavy-duty vehicles 4, M6 default RDs)

8 0.0388 0.0726 0.0679 0.0635 0.0594 0.0556 0.0520 0.0486 0.0455 0.0425

0.0398 0.0372 0.0348 0.0326 0.0304 0.0285 0.0266 0.0249**0.~233** 0.0218 0.0204 0.0191 0.0178 0.0167 0.0797 * HDV5 (Heavy-duty vehicles 5, same RD asHDV4, M6 Default)

9 '0.0388 0.0726 0.0679 0.0635 0.0594 0.0556 0.0520 0.0486 0.0455 0.0425 0.0398 0.0372 0.0348 0.0326 0.0304 0.0285 0.0266 0.0249 0.0233 0.0218 0.0204 0.0191 0.0178 0.0167 0.0797 * HDV6 (Heavy-duty vehicles 6, same RD as HDV4, M6 Default) 10 0.0388 0.0726 0.0679 0.0635 0.0594 0.0556 0.0520 0.0486 0.0455 0.0425 0.0398 0.0372 0.0348 0.0326 0.0304 0.0285 0.0266 0.0249 0.0233 0.0218 0.0204 0.0191 0.0178 0.0167 0.0797 * HDV7 (Heavy-duty vehicles .7, same RD as HDV4, M6 Default) 11 0.0388 0.0726 0.06790.0'35 0.0594 0.0556 0.0520 0.0486 0.0455 0.0425 0.0398 0.0372 0.0348 0.0326 0.0304 0.0285 0.0266 0.0249 0.0233 0.0218 0.0204 0.0191 0.0178 0.0167 0.0797 * HDV8A (Heavy-duty vehicles 8A same RD as HDV4, M6 Default) 12 0.0388 0.0726 0.0679 0.0635 0.0594 0.0556 0.0520 0.0486 0.0455 0.0425 0.0398 0.0372 0.0348 0.0326 0.0304 0.0285 0.0266 0.0249 0.0233 0.0218 0.0204 0.0191 0.0178 0.0167 0.0797 * HDV8B (Heavy-duty vehicles 8B,same RD as HDV4, M6 Default)



### 4813 0.0388 0.0726 0.0679 0.0635 0.0594 0.0556 0.0520 0.0486 0.0455 0.0425 0.0398 0.0372 0.0348 0.0326 0.0304 0.0285 0.0266 0.0249 0.0233 0.0218 0.0204 0.0191 0.0178 0.0167 0.0797 * HDBS (HDV School buses; this M6 RD default is assumed) 14 0.0393 0.0734 0.0686 0.0641 0.0599 0.0559 0.0522 0.0488 0.0456 0.0426 0.0398 0.0372 0.0347 0.0324 0.0303 0.0283 0.0264 0.0247 0.0231 0.0216 0.0201 0.0188 0.0176 0.0165 0.0781 * HDBT (HDV Transit buses; this M6 RD default is assumed) 15 0.0307 0.0614 0.0614 0.0614 0.0614 0.0614 0.0614 0.0614 0.0614 0.0613 0.0611 0.0607 0.0595 0.0568 0.0511 0.0406 0.0254 0.0121 0.0099 0.0081 0.0066 0.0054 0.0044 0.0037 0.0114 * Motorcycles (this M6 default RD is the same as M5a/b's default RD) 16 0.1440 0.1680 0.1350 0.1090 0.0880 0.0700 0.0560 0.0450 0.0360 0.0290 0.0230 0.0970 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 *


### External MOBILE6.2 Activity File Inputs: VMT by Facility Type, VMT by Hour, VMT by Speed Bin.

The following files were used in the 2002 base yearand the 2008 and 2009 future year estimates. 

### VMTby Facility Type The M6.2 default file is FVMT.D, provided with the MOBILE6 model. The Chicagoarea-specific VMT-by-facility-type file is FVMTCH07.D, shown below. Itbased on the mostrecent complete data from CMAP on VMT by hourby vehicle class. This is avery long file -about750 lines-so for the purposes ofthis Attachment, only the data for vehicle types 1,6,11,13,24 (LDGV, HDGV2b, HDGV7, HDGV13, and MC) are shown; the others are omitted. See the secondparagraph ofthe introductionto the file.

VMT BY FACILITY * * This is [F:\]AREASPEC\CHNAA\FVMTCH07.DEF, an,FVMT file, which was * developed from CATS 2007 transportation model output * as given in his MF13.XLS file as sent to and recalculated by * SL. 13.xj.02. * * VMT fractions are listed for 28 vehicle classes for each hour of * the day starting at GAM, as follows * Classes 1-5 (LOGV, LDGT1, LDGT2, LDGT3, and LDGT4), and * Classes 14, 15, and 28 (LDDV, LDDT12, LDDT34) were all assumed * to have the "Light-duty Vehicle" distribution' on page "SL VMT * by vtype reedited" of the MF13 file. * Classes 6-10 and 16-20 (HDGV2b-HDGV6 and HDDV2b-HDDV6) were assumed * to have the "LTRK" (light HDV) distl0.bution on that page. * Classes 11 & 12 and 21 & 22 (HDGV7 &HDGV8a, and HDDV7 & HDDV8a) were * assumed to have the "MTRK" (medium HDV) distribution on that page. * Classes 13 and 23 (HDGV8b and HDDV8b) were assumed to have the * "HTRK" (heavy HDV) distribution on that page * Classes 24 and 25-27 (Motorcycles and the three bus classes [HDGB, * HDDBT and HDDBS]) were assumed to have the default distribution * for those types in FVMT.DEF.

49 

# ..

# ·

...

* * The four values in each line represent the VMT distribution on * freeway, arterial, local and ramps--in that order--as shown. * * See M6UG 2.8.5.1.f., p. 49, or CLASLIST.TXT for further info. * (The CLASLIST file describes the vehicle classes.) * * Veh Int& Arts& Local *Class Fwys Colls Rd/St Ramps *----- * 1 0.3341 0.5393 0.1105 0.0161 0.2604 0.6106 0.1160 0.0130 0.2604 0.6106 0.1160 0.0130 0.2669 0.5831 0.1365 0.0135 0.2576 0.5823 0.1468 0.0133 0.2576 0.5823 0.1468 0.0133 0.2576 0.5823 0.1468 0.0133 0.2576 0.5823 0.1468 0.0133 0.2683 0.5830 0.1354 0.0133 0.2683 0.5830 0.1354 0.0133 0.2646 0.5911 0.1315 0.0128 0.2646 0.5911 0.1315 0.0128- 0.2825 0.5568 0.1468 0.0139 0.2825 0.5568 0.1468 0.0139 0.3363 0.5122 0.1358 0.0157 0.3363 0.5122 0.1358 0.0157 0.3363 0.5122 0.1358 0.0157 0.3363 0.5122 0.1358 0.0157 0.3363 '0.5122 0.1358 0.0157 0.3363 0.5122 0.1358 0.0157 0.3363 0.5122 0.1358 0.0157 0.3363 0.5122 0.1358 0.0157 0.3363 0.5122 0.1358 0.0157 0.3363 0.5122 0.1358 0.0157 

### [Data for Vehicle Types 

### 2 through 

### 5 omitted]
6 0.3836 0.5157 0.0827 0.0180 0.3045 0.5985 0.0822 0.0148 0.3045 0.5985 0.0822 0.0148 0.3589 0.5412 0.0829 0.0170 0.3791 0.5203 0.0826 0.0180 0.3791 0.5203 0.0826 0.0180 0.3791 0.5203 0.0826 0.0180 0.3791 0.5203 0.0826 0.0180 0.3606 0.5397 0.0827 0.0170 0.3606 0.5397 0.0827 0.0170 0.3581 0.5432 0.0816 0.0171 0.3581 0.5432 0.0816 0.0171 0.4101 ·0.4884 0.0815 0.0200 0.4101 0.4884 0.0815 0.0200 0.4312 0.4663 0.0818 0.0207 0.4312 0.4663 0.0818 0.0207 0.4312 0.4663 0.0818 0.0207 0.4312 0.4663 0.0818 0.0207 0.4312 0.4663 0.0818 0.0207 0.4312 0.4663 0.0818 0.0207 0.4312 0.4663 0.0818 0.0207 0.4312 0.4663 0.0818 0.0207 0.4312 0.4663 0.0818 0.0207 0.4312 0.4663 0.0818 0.0207



### 50

### [Data for Vehicle Types 7 through 11 omitted]
11 0.4158 0.4904 0.0752 0.0186 0.3337 0.5763 0.0749 0.0151 0.3337 0.5763 0.0749 0.0151 0.3905 0.5165 0.0755 0.0175 0.4111 0.4952 0.0752 0.0185 0.4111 0.4952 0.0752 0.0185 0.4111 0.4952 0.0752 0.0185 0.4111 0.4952 0.0752 0.0185 0.3928 0.5144 0.0753 0.0175 0.3928 0.5144 0.0753 0.0175 0.3896 0.5185 0.0742 0.0177 0.3896 0.5185 0.0742 0.0177 0.4423 0.4630 0.0743 0.0204 0.4423 0.4630 0.0743 0.0204 0.4619 0.4425 0.0745 0.0211 0.4619 0.4425 0.0745 0.0211 0.4619 0.4425 0.0745 0.0211 0.4619 0.4425 0.0745 0.0211 0.4619 0.4425 0.0745 0.0211 0.4619 0.-4425 0.0745 0.0211 0.4619 0.4425 0.0745 0.0211 0.4619 0.4425 0.0745 0.0211 0.4619 0.4425 0.0745 0.0211 0.4619 0.4425 0.0745 0.0211 

### [Data forVehicle Types 7 through 12 omitted]
13 0.6106 0.3299 0.0430 0.0165 0.5563 0.3937 0.0367 0.0133 0.5563 0.3937 0.0367 0.0133 0.6241 0.3235 0.0376 0.0148 0.6260 0.3178 "0.0403 0.0159 0.6260 0.3178 0.0403 0.0159 0.6260 0.3178 0.0403 0.0159 0.6260 0.3178 0.0403 0.0159 0.6561 0.2957 0.0340 0.0142 0.6561 0.2957 0.0340 0.0142 0.6029 0.3414 0.0401 0.0156 0.6029 0.3414 0.0401 0.0156 0.5776 0.3523 0.0508 0.0193 0.5776 0.3523 0.0508 0.0193 0.5737 0.3512 0.0547 0.0204 0.5737 0.3512 0.0547 0.0204 0.5737 0.3512 0.0547 0.0204 0.5737 0.3512 0.0547 0.0204 0.5737 0.3512 0.0547 0.0204 0.5737 0.3512 0.0547 0.0204 0.5737 0.3512 0.0547 0.0204 0.5737 0.3512 0.0547 0.0204 0.5737 0.3512 0.0547 0.0204 0.5737 0.3512 0.0547 0.0204 

### [Data fqfVehicle Types 14 through 23 omitted]
24 0.392 0.457 0.117 0.034 0.344 0.497 0.129 0.030 0.338 0.497 0.135 0.029 0.349 0.492 0.129 0.030 0.346 0.497 0.127 0.030 0.333 0.509 0.129 0.029



### 51 ... 

# .0.324 0.516 0.132 0.028 0.334 0.506 0.131 0.029 0.334 0.506 0.131 0.029 0.320 0.519 0.134 0.028 0.330 0.506 0.135 0.029 0.312 0.521 0.140 0.027 0.295 0.538 0.141 0.026 0.310 0.527 0.137 0.027 0.329 0.510 0.133 0.029 0.343 0.497 0.131 0.030 0.381 0.460 0.126 0.033 0.405 0.437 0.123 0.035 0.426 0.418 0.118 0.037 0.443 0.403 0.115 0.039 0.457 0.394 0.110 0.040 0.461 0.391 0.107 0.040 0.453 0.400 0.108 0.039 0.418 0.434 0.112 0.036 [Data for Vehicle Types 25 through 28 omitted; the file ends afterVehicle Type 28.]



### VMT by Hour ofthe

### Day The MOBILE6.2 default file is HVMT.D. The most currentChicago-area-specific file is HVMTCH7R.SL, shownbelow, derived from 2007 modeling output from CMAP. Again, this file contains "commented-out" data from previous files for comparison purposes.
VMT BY HOUR 

### * Fraction of all vehicle miles traveled by hour of the day. 

### * First hour is 6 a.m. These data are for the Chicago NAA for 

### * 2007, derived from CMAP VbyHr07.def file based 

### * upon his run iepa07 300_20070830, VMT for 2007. 

### * * This file is HVMTCH7R.SL representing SL's estimate of VMT by hour. * IEPA estimates are based on CMAP data, but assume VMT in multi-hour * modeling periods is distributed as the default is distributed across 

### * the hours in question.**Cal~ulations** made from VbyHr07.def 

### * in accordance with USEPA guidance on the subject. See M6 Technical Guidance 

### * Document (Jan '02) Section 4.3.3· for details.

0.03358 0.06609 0.05924 0.00757 0.07039 0.06207 0.04599 0.00603 0.06240 0.07658 0.06693 0.07118 0.02160 0.01851 0.00568 0.00561 0.05870 0.07991 0.01360 0.00687 0.06327 0.07507 0.01010 0.01304



### * * * * * Here are RP's original fractions from VbyHr07.def 0.033579 0.066392 0.066392 0.076578 0.062532 0.062532 0.062532 0.062532 0.069056 0.069056 0.077490 0.077490 0.052616 0.052616 0.010861 0.010861 0.010861**0.~0861** 0.010861 0.010861 0.010861 0.010861 0.010861 0.010861

0.0582 0.0730 0.0144 0.0186 0.0540 0.0777 0.0194 0.0098 0.0555 0.0636 0.0264 0.0080 

### * These following are the default values from HVMT.DEF 

### * supplied for comparison. 

### * 0.0569 0.0740 0.0655 

### * 0.0608 0.0571 0.0598 

### * 0.0501 0.0389 0.0308 

### * 0.0108 0.0086 0.0081

52

### * * * * * * * Following are 8L's runs made in 2002 0.0443 0.0851 0.0609 0.0572 0.0576 0.0447 0.0077 0.0061 original HVMTCH07 fractions based upon DE's '07 model (for information)

. 0.0755 0.0577 0.0541 0.0583 0.0659 0.0701 0.0818 0.0769 0.0219 0.0188 0.0138 0.0102 0.0058 0.0057 0.0070 0.0132 All these Hourly-VMT files show similarprofiles, with morning and afternoonpeaks, a noontime dip, and a minimum about 3AM

- 4AM, which is to be expected.



### VMT by Speed Bin The MOBILE6.2 defaultfile is SVMT.D. The Chicago-area-specific Speed-bin file is SVMTCH07.DEF, shownbelow. 

### It represents 2007 CMAP transportationmodel output.

SPBED VMT

1 10.0053 0.0044 0.0088 0.0299 0.0300 0.0484 0.0641 0.0632 0.07090.08010.0981 0.216 0 0.1953 0.0857

1 2 0.0135 0.0570 0.0859 0.07900.0766 0.0954 0.06810.0704 0.0722 0.1018 0.0761 0.1084 0.0524 0.0432

1 3 0.0135 0.0570 0.0859 0.07900.0766 0.0954 0.0681 0.0704 0.0722 0.1018 0.0761 0.1084 0.0524- 0.0432

1 40.0017 0.00540.0027 0.01590.0331 0.04510.0702 0.0761 0.0892 0.1259 0.11640.2390 0.0989 0.0805

1 5 0.0017 0.0047 0.0109 0.03290.0238 0.0300 0.0439 0.0582 0.0740 o.i 160 0.1244 0.2584 0.1237 0.0975

1 60.00170.00470.01090.03290.0238 0.03000.04390.05820.07400,11600.1244 0.2584 0.1237 0.0975

1 7 0.0017 0.0047 0.0109 0.03290.0238 0.0300 0.0439 0.0582 0.07400.1160 0.1244 0.2584 0.1237 0.0975

1 8 0.0017 0.0047 0.0109 0.03290.0238 0.0300 0.0439 0.0582 0.0740 0.1160 0.1244 0.2584 0.1237 0.0975

1 9 0.0072 0.0093 0.0142 0.0382 0.0420 0.0478 0.0654 0.0898 0.0849 0.1104 0.1195 0.2126 0.0722 0.0866

110 0.0072 0.0093 0.0142 0.03820.0420 0.0478 0.0654 0.0898 0.0849 0.1104 0.1195 0.2126 0.0722 0.0866

111 0.0081 0.0325 0.0434 0.06830.0493 0.0530 0.0780 0.0803 0.07730.0953 0.1179 0.1443 0.0875 0.0648

.1 12 0.0081 0.0325 0.04340.06830.0493 0.0530 0.07800.0803 0.07730.0953 0.1179 0.144 3 0.0875 0.0648

1130.0016 0.0013 0.0059 0.01370.0237 0.0247 0.0391 0.0556 0.04790.0729 0.0904 0.22020.2979 0.1049

114 0.0016 0.0013 0.0059 0.01370.0237 0.02470.0391 0.05560.0479 0.0729 0.0904 0.2202 0.2979 0.1049

1 15 0.0011 0.0002 0.0000 0.00000.0000 0.0038 0.01010.0178 0.0386 0',0660 0.09810.1509 0.5215 0.0919

1 16 0.0011 0.0002 0.0000 0.00000.0000 0.0038 0.01010.0178 0.0386 0.0660 0.0981 0.1509 0.5215 0.0919

117 0.0011 0.0002 0.0000 0.00000.0000 0.0038 0.01010.0178 0.0386 0.0660 0.0981 0.1509 0.5215 0.0919

1 18 0.0011 0.0002 0.0000 0.0000 0.0000 0.0038 0.01010.0178 0.0386 0.0660 0.0981 0.1509 0.5215 0.0919

119 0.0011 0.0002 0.0000 0.00000.0000 0.0038 0.01010.0178 0.0386 0.0660 0.09810.1509 0.5215 0.0919

120 0.0011 0.0002 0.0000 0.00000.0000 0.0038 0.01010.01780.03860.0660 0.0981 0.1509 0.5215 0.0919

1 21 0.0011 0.0002 0.0000 0.0000 0.0000 0.0038 0.01010.0178 0.0386 0.0660 0.09810.1509 0.5215 0.0919

122 0.0011 0.0002 0.00000.00000.0000 0.0038 0.01010.01780.03860.0660 0.0981 0.1509 0.5215 0.0919

1 23 0.00110.0002 0.0000 0.00000.0000 0.0038 0.01010.0178 0.0386 0.0660 0.09810.1509 0.5215 0.0919

1 24 0.0011 0.0002 0.0000 0.0000 0.0000 0.0038 0.01010.0178 0.0386 0.0660 0.0981 0.1509 0.5215 0.0919

53**,~-**

2 1 0.0000 0.0004 0.0017 0.0041 0.0160 0.0461 0.1311 0.1952 0.1835 0.2385 0.0665 0.1170 0.0000 0.0000

2 2 0.0021 0.0328 0.0517 0.0618 0.0924 0.1181 0.1447 0.1449 0.1170 0.1185 0.0457 0.0704 0.0000 0.0000

2 3 0.0021 0.0328 0.0517 0.0618 0.0924 0.1181 0.1447 0.1449 0.1170 0.1185 0.0457 0.0704 0.0000 0.0000

2 4 0.0001 0.0007 0.0025 0.0068 0.0232 0.0572 0.1470 0.2077 0.1791 0.2034 0.0682 0.1041 0.0000 0.0000

2 5 0.0000 0.0008 0.0029 0.0074 0.0224 0.0565 0.1435 0.1985 0.1862 0.2044 0.0681 0.1093 0.0000 0.0000

2 6 0.0000 0.0008 0.0029 0.0074 0.0224 0.0565 0.1435 0.1985 0.1862 0.2044 0.0681 0.1093 0.0000 0.0000

2 7 0.0000 0.0008 0.0029 0.0074 0.0224 0.0565 0.1435 0.1985 0.1862 0.2044 0.0681 0.1093 0.0000 0.0000

2 8 0.0000 0.0008 0.0029 0.0074 0.0224 0.0565 0.1435 0.1985 0.1862 0.2044 0.0681 0.1093 0.0000 0.0000

2 90.00020.00280.00640.0149 0.0423 0.0779 0.1620 0.1879 0.17320.17340.0644 0.0947 0.0000 0.0000

2 10 0.0002 0.0028 0.0064 0.0149 0.0423 0.0779 0.1620 0.1879 0.1732 0.1734 0.0644 0.0947 0.0000 0.0000

2 11 0.0017 0.0151 0.0292 0.0423 0.0720 0.1030 0.1538 0.1654 0.1429 0.1415 0.0511 0.0821 0.0000 0.0000

2 12 0.0017 0.0151 0.0292 0.0423 0.0720 0.1030 0.1538 0.1654 0.1429 0.1415 0.0511 0.0821 0.0000 0.0000

'2 13 0.0000 0.0003 0.0018 0.0039 0.0140 0.0369 0.1146 0.1939 0.1865 0.2383 0.0751 0.1348 0.0000 0.0000

2 14 0.0000 0.0003 0.0018 0.0039 0.0140 0.0369 0.1146 0.1939 0.1865 0.2383 0.0751 0.1348 0.0000 0.0000

2 15 0.0003 0.11000 0.0002 0.0008 0.0008 0.0042 0.0749 0.1565 0.1661 0.3285 0.0786 0.1890 0.0000 0.0000

2 16 0.0003 0.0000 0.0002 0.0008 0.0008 0.0042 0.0749 0.1565 0.1661 0.3285 0.0786 0.1890 0.0000 0.0000

2 17 0.0003 0.0000 0.0002 0.0008 0.0008 0.0042 0.0749 0.1565 0.1661 0.3285 0.0786 0.1890 0.0000 0.0000

2 18 0.0003 0.0000 0.0002 0.0008 0.0008 0.0042 0.0749 0.1565 0.1661 0.3285 0.0786 0.189 0 0.0000 0.0000

2 19 0.0003 0.0000 0.0002 0.0008 0.0008 0.0042 0.0749 0.1565 0.1661 0.3285 0.0786 0.1890 0.0000 0.0000

2 20 0.0003 0.0000 0.0002 0.0008 0.0008 0.0042 0.0749 0.1565 0.1661 0.3285 0.0786 0.1890 0.0000 0.0000

2 21 0.0003 0.0000 0.00.02 0.0008 0.0008 0.0042 0.0749 0.1565 0.1661 0.3285 0.0786 0.1890 0.0000 0.0000

2 22 0.0003 0.0000 0.0'002 0.0008 0.0008 0.0042 0.0749 0.1565 0.1661 0.3285 0.0786 0.189 0 0.0000 0.0000

2 23 0.0003 0.0000 0.0002 0.0008 0.0008 0.0042 0.0749 0.1565 0.1661 0.3285 0.0786 0.189 0 0.0000 0.0000

2 24 0.0003 0.0000 0.0002 0.0008 0.0008 0.0042 0.0749 0.1565 0.1661 0.3285 0.0786 0.1890 0.0000 0.0000

* Speed Bins:



### * 45.0 2.5 50.0 5.0 55.0 10.0 60.0 15.0 65.0+ 20.0 25.0 30.0 35.0 40.0



### * Speed bins extend 2.5 mph on either side of the bin name (i.e., the 30 mph speed bin encompasses speeds from 27.5 to 32.5 mph), except for the 2.5 mph bin (0 to 2.5 mph) and the 65+ mph bin (62.5 mph or above)



### * * This is SVMTCH07.DEF. 

### * * These data come from a spreadsheet page titled "[DE] spdvmt" in the Excel file**MF13.X~S,** supplied to IEPA by CATS, in October '02, being VMT output from cA:rS I S 

### transportation model aggregated into the various**speed~ins** by county and M6 road type for the 8 CATS time periods. SL 

### * slightly modified and reformatted the page, and verified that DE's vmt-by-speed-bin calculations were correct. See also CATS's file titled VBYSPD.DEF


### * * The information in this file strictly speaking represents a speed



### 54distribution for 2007, but this is assumed (after discussion with CATS) reasonably valid throughout the 2000-2020 period. 

### * * The above data are for the Chicago NAA, and for Freeways and Arterials only. 

### * * See M6 User's Guide Sec. 2.8.8.2.c and Appendix B, Table 5: "Average Speed Ranges for Speed Bins 

### * (SPEED VMT Command)" for further information about this file and its use. 

### * * The first number in each line is roadway type: 1 

## = Freeways; 2 

## = Arterials. Locals and Ramps have a fixed speed in M6, and therefore are not affected by this file. 

### * The second number is the hour of the day, hour 1 being [hour beginning at] 6 AM, and hour 24 being [hour beginning at] 5 AM the next day. 

### * The third and subsequent numbers are the fractions of VMT in that hour that occurs 'within the specified speed bins. These fractions were calculated from DE's file, which gave estimates of VMT assigned to each of the 8 CATS modeling periods.



### * * Note that, for 'Freeways, most VMT is in the 45-50-55-60-mph speed bins, with lower speeds more common during Peak hours (which is reasonable). Much the same holds for Arterials, where most VMT is in the 30-35-40-45 mph speed bins (also reasonable)

.



### * * See also the default VMT-by-speed file SVMT.DEF for more information and comments. 

### *

* --SL, 25.xj.02 

### * Revisions: 

### * 7.ix.06

... Small changes made to text of these comments by SL; no changes to numerical data.

55

### ILLINOIS ENVIRONMENTAL PROTECTION AGENCY Notice ofPublic Hearing for State Implementation Plan (SIP) Submittals Forthe Chicago. lllinois Ozone NonattainmentArea The lllinois Environmental Protection Agency (lllinois EPA) will hold apublic hearing on December 16. 2008 at 9:00 a.m. in Room 9-031 atthe James R. Thompson Center. 1

### 00 West Randolph Street Chicago. lllinois. The public hearing will be held by the IDinois EPA Bureau ofAirforthe purpose ofgathering public comments on two 

### draft SIPs related 

### to the 1997 8-hour ozone National AmbientAir Quality Standard (NAAQS). The IDinois EPA is seeking comments onthe draftAttainment Demonstration, the draftMaintenance Plan, and associated draftmotorvehicle emissions budgets, all ofwhich the lllinois EPAproposes 

### to submitto the United States Environmental Protection Agency (U

### .S. EPA) as SIP revisions 

### to meet the requirements ofthe federal Clean Air Act (CAA). The Attainment Demonstration contains the State's plan for attaining the 19978- hourozone NAAQS in the Chicago, Illinois nonattainment area. The Illinois EPA intends 

### to requestthatU.S. EPA redesignate the Chicago area to 

### attainment ofthe 1997 8-hour ozone NAAQS based on ambient monitoring data from 2006 through 2008. The draft Maintenance Plan contains the State's plan for maintaining the 8-hourozone NAAQS for at least 10 years after

### V.S. EPA redesignates the area to attainment. The SIP revisions will also establishnew motorvehicle emissions budgets for the years 2009 and 2020 forthenonattainment area. The hearing will satisfy the requirements ofSection 110(1) ofthe CAA (42. 

### V.S.C. 7401(1) (public notice for SIP submittals». The Dlinois EPA will also be taking comments on establishing boundaries forthe nonattainment area

### to be establishedpursuantto the 2008 ozone NAAQS revision. Copies ofthese draft SIP submittals for the Chicago, TIlinois nonattainment areamay be viewed by the public prior

### to the hearing during regularbusiness hours (Monday through Friday 8:30 a.m. until 4:30 p.m., exceptfor State holidays) atthe lllinois EPA's offices at 9511 West Harrison Street 

### in Des Plaines, Illinois, as well as onlllinois EPA's website at http://www.epa.state.i1.us. No walk-inrequests for copies ofthis material will be -accommodated. Requests and public inquiries shouldbe directed to Rachel Doctors at the address below. The hearing will beheld underthe provisions ofthe lllinois EPA's "Procedures for Information and Quasi-Legislative Public Hearings" (35 TIL Adm. Code 164). Any questions aboutthe hearing procedures, requests for copies ofthe hearing rules, orrequests for special need interpreters shouldbe directed to the address below. Requests for special needs interpreters must be made by December 1, 2008. Closure ofthe Hearing Record. The Hearing Record will

## ~lose on January 15,2009. Comments need not 

### be notarized, butmustbe postmarked bymidnightJanuary 15,2009, and mailed to Rachel Doctors, lllinois EPA, 1021 North GrandAvenue East, P.O. Box 19276, Springfield, Illinois 62794-9276, telephone number 217/782-5544 orTDD 217.782-9143.



# - ATTACHMENT 2

# "J

# .bUu-~~t1~ L-m-l,tl**~l.2 -~;-~S** 

## ~rZ-3**~·i~** S'/S"""

### '>2/ .,

## no 

# I**,f~"...A-.** 

# s. 

# e..,... ;)**tP~M** .....

### L.C.

..... 

### ORGANIZATION

# ~MNf If .f..(, Ex)(bt4uo'a,.

...... 

## {IRS 

## c**o~** 

# SIGN-IN SHEET Illinois Environmental Protection Agency Tuesday, December 16,2008 (9:00 AM

- 5:00 PM) (Public Hearing --AttainmentDemonstration & Maintenance Plan for 8-Hour Ozone for Chicago) James R. Thompson Center

- Room 9-031 Chica2o, Illinois



# ScoH-

# ~D"SSr AreoNS

# '-a.~



# • • ATTACHMENT 3