, ;

DRAFT

Maintenance Plan for the

Illinois Portion ofthe

Chicago Qzone Nonattainment Area'

For the 1997 8-Hour Ozone Standard

AQPSTR 08-08

November 15, 2008

Illinois Environmental Protection Agency

1021 North Grand Avenue East

Springfield, Illinois 62794-9276

._--_.._----

ATTACHMENT 1
TABLE OF CONTENTS

Page

LIST OF TABLES .

LIST OF FIGURES .

EXECUTIVE SUMMARY .

111

iv

5

1.0 INTRODUCTION. 6

1.1 Regulatory BackgroUnd 6

1.2 Status of Air Quality . 8

2.0 REDESIGNATION AND MAINTENANCE PLAN REQUIREMENTS 9

3.0 OZONE MONITORING 11

3.1 Monitored Design Values 11

3.2 Quality Assurance 13

3.3 Continued Monitoring 13

4.0 EMISSION INVENTORY . 14

4.1 Attainment year Inventory - 2006 14

. 4.2 Air Quality Improvements and Emission Controls 15

4.3 Emission Projections . 16

4.4 Demonstration ofMaintenance 17

4.5 Provisions for Future Updates 18

5.0 CONTROL MEASURES AND REGULATIONS 19

5.1 Attainment Demonstration Control Measures 19

5.2 Reasonable Further Progress 20

5.3 Reasonably Available Control Technology (RACT) . 21

5.4 Controls to Remain in Effect. 22

5.5 Provisions for Permitting New or Modified Emission Sources 22

5.6 Transportation Conformity 22

6.0 CONTINGENCY MEASURES 24

6.1 Con~gency Measures 24

6.2 COImpitment to Revise Plan 26

6.3 Public Participation . 27

6.4 Legal Authority to Implement and Enforce 27

7.0 CONCLUSIONS 28

TABLE OF CONTENTS (Continued)

1
APPENDIX A Summary ofAmbient Air Monitoring Data (2006-2008)

APPENDIX B Transportation Conformity

11
LIST OF TABLES

Page

Table 4.1 2006 Chicago Ozone Nonattainment Area

YOM and NOx Emissions 14

Table 4.2 2002 Chicago Ozone Nonattainment Area

YOM and NOx Emissions 15

Table 4.3 2013 Chicago Ozone Nonattainment Area

YOM and NOx Emissions 16

Table 4.4 2020 Chicago Ozone Nonattainment Area

YOM and NOx Emissions 17

Table 4.5 Comparison of 2006, 2013, and 2020 Emission Estimates

Chicago Nonattainment Area . 17

Table 4.6 Estimated NOx Emission Reductions from Utility Boilers

Resulting from Implementation ofIllinois, Multi-Pollutant Standards. 18

Table 5.1 Proposed Chicago NAA Year 2020

Motor Vehicle Emissions Budgets ...23

Table 6.1 Contingency Plan for the Chicago 8-Hour Ozone

Nonattainment Area ...25

III
LIST OF FIGURES

Figure 1.1 Map ofthe Lake Michigan Nonattainment Areas

Figure 3.1 Ozone Monitors in the Lake Michigan Area .

Figure 3.2 Comparison of 8-Hour Ozone Design Values for the

Lake Michigan Region Between 2001-2003 and 2006-2008 .

IV

Page

7

11

12
EXECUTIVE SUMMARY

This document describes Illinois' Maintenance Plan for the Illinois portion ofthe Chicago ozone

nonattainment area. A Maintenance Plan is required before the area can be redesignated from

nonattainnient to attainment ofthe 8-hour ozone National Ambient Air Quality Standard

(NAAQS) promulgated in 1997. This document also provides technical information required to

support a redesignation request. Illinois intends to submit such a request to the U. S.

Environmental Protection Agency (U.S. EPA). The Illinois Environmental Protection Agency

(Illinois EPA) has prepared this plan in consultation with the Indiana Department of

Environmental Management (IDEM), the Wisconsin Department ofNatural Resources (WDNR),

and the Michigan Department ofEnvironmental Quality (MDEQ), the Lake Michigan Air

Directors Consortium (LADCO), and U.S. EPA. The IDEM is preparing a similar plan for the

Indiana portion ofthe Chicago nonattainment area.

Ozone air quality has dramatically improved in the Lake Michigan region as a result of

implementation ofState and Federal control measures since the designation ofthe Chicago area

as nonattainment in 2004. With the exception of Holland, Michigan, the entire Lake Michigan

region, including the Chicago nonattainment area, has at least three years of complete, quality

assured ambient air quality monitoring data for 2006-2008 that demonstrates compliance with

tlie 1997 8-hour ozone NAAQS. These air quality improvements are due to permanent and

enforceable emission control measures.

This Maintenance Plan provides for the'continued attainment ofthe 8-hour ozone air quality

standard for the Chicago nonattainmen~ area for a period often years after U.S. EPA has

formally redesignated the areato attainment. The Plan also provides assurances that, even if

there is a subsequent violation ofthe air quality standard, measures listed in the Plan will prevent

any future occurrences through contingency measures that would be 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 required before the area can be redesignated from

nonattainment to attainment ofthe 8-hour ozone National Ambient Air Quality Standard

(NAAQS) promulgated by the U. S. Environmental Protection Agency (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 Michigan Department ofEnvironmental Quality (MDEQ), the Lake Michigan Air

Directors Consortium (LADCO), and U.S. EPA. The IDEM is preparing a similar plan for the

Indiana portion ofthe Chicago nonattainment area. With the exception ofHolland, Michigan,

the entire Lake Michigan region, including the Chicago area, has at least three years of complete,

quality assured ambient air quality monitoring data for 2006-2008, demonstrating attainment

with the 8-hour ozone NAAQS.

This document also provides the technical information needed to support a request to redesignate

the Chicago area to attainment ofthe 8-hour ozone NAAQS. Section 107 ofthe Clean Air Act

(CAA) establishes specific requirements to be met in order for anonattainment area to be

considered for redesignation. Before an area can be reclassified to attainment, U.S. EPA must

make a determination that the area has attained the 8-hour ozone NAAQS based on at least three

complete years of ambient monitoring data. U.s. EPA must have approved a State

Implementation Plan (SIP) for the area under Section 110 and Part D 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 implemented if

future violations ofthe 8-hour ozone NAAQS are measured.

This Maintenance Plan provides for the continued attainment ofthe 8-hour ozone NAAQS for

the Chicago nonattainment area (NAA) for a period often years after U.S. EPA has formally

redesi,gnated the area to attainment. The Plan also provides assurances that even if a 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 plan requirements established by the CAA and U.S.

EPA, and includes additional information to support continued compliance with the 8-hour

.ozone NAAQS.

1.1 Regulatory Background

The CAA, as amended in 1990, requires areas that fail to meet the NAAQS for o~one to develop

SIPs to expeditiously attain and maintain the NAAQS. Historically, exceedances ofthe ozone

NAAQS have been monitored in Cook and Lake Counties in Illinois, and in portions of

Wisconsin, Indiana, and Michigan immediately downwind ofthe Chicago, Gary, and Milwaukee

metropolitan areas.

6
The Chicago NAA, which includes Lake and Porter Counties in northwest Indiana, was

originally designated as nonattainment in 2004 pursuant to the 1997 revisions to the ozone

National Ambient Air Quality Standard. Several counties in eastern Wisconsin, and one county

in western Michigan adjacent to 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 current NAAs in the Lake Michigan region.

Figure 1.1

Map ofthe Lake Michigan Ozone Nonattainment Areas

,i~

The following is a list ofthe counties, and portions thereof, contained in the Chicago 8-hour

ozone severe nonattainment area:

• Cook County, IL

• Lake County, IL

• DuPage County, IL

• McHenry County, IL

• Kane County, IL

• Will County, IL

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

• Kendall County, IL (Oswego Township)

• Lake County, IN

• Porter County, IN

As a result ofthe designation as nonattainment and the accompanying classification as moderate,

these areas were subject to new requirements, including development of a plan demonstrating

that the area would meet the federal8-hour NAAQS for ozone by 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), to jointly develop 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

significant reductions ofincoming (transported) ozone and ozone precursor emissions (including

oxides ofnitrogen, or NOx) to allow the States- to attain the NAAQS. The emission reductions

needed to attain the 8-hour ozone NAAQS include both State and Federal measures that have

reduced ozone precursor emissions both locally and regionally. These measures have allowed

the Chicago nonattainment area to attain the 8-hour ozone standard by the attainment deadline

established by the U.S. EPA.

1.2 Status ofAir Ouality

Ozone monitoring data for the most recent three-year period, 2006 through 2008, demonstrates

that air quality has met the 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 that Holland, MI will attain the ozone NAAQS by 2012.

8
2.0 REDESIGNATION AND MAINTENANCE PLAN REQUIREMENTS

Sections 107 and 110 ofthe CAA list a number ofrequirements that must be met by

nonattainment areas prior to consideration for redesignation to attainment. One ofthose

requirements is the maintenance plan, which reflects a state's plan for maintaining the NAAQS

for a ten-year period after redesignation to attainment. U.S. EPA has published guidance for the

preparation of maintenance plans and redesignation requests. This guidance is contained in a

document entitled "Procedures for Processing Requests to Redesignate Areas to Attainment"

(September 4, 1992).

Before a redesignation to attainment can be 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 that violations ofthe ambient NAAQS are no longer

occurring. This showing must rely on three consecutive years of data. The ambient air

monitoring data must be quality assured in accordance with 40 CFR 58.10, recorded in

U.S. EPA's Air Quality System (AQS) data base, and is available to the public.

• Approve the state's plan for demonstrating attainment. The attainment plan, which is

based on air quality modeling, must contain enforceable control measures and must be

submitted as a revision to the state's SIP after a public hearing.

• Determine that the improvement in air quality between the year violations occurred and

the year that attainment was achieved is based on permanent and enforceable emission

reductions.

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

discussed below.

• Determine that all other requirements applicable to nonattainment areas have beenmet.

A maintenance plan provides for the continued attainment ofthe 8-hour ozone NAAQS for a

nonattainment area for period often years after U.S. EPA has formally redesignated the area to

attainment. The plan also provides assurances that even if a subsequent violation ofthe NAAQS

occurs, provisions in the plan will prevent any future occurrences through contingency measures

that would be triggered upon such occurrence. To be approvable, the state is required to have a

public hearing on the maintenance plan prior to adoption. The maintenance plan must contain

the following elements:

• A comprehensive emission inventory ofthe precursors of ozone completed for the

"attainment year";

9
• A projection ofthe emission inventory forward to a year at least ten years after

redesignation and a demonstration that the projected level of emissions is sufficient to

maintain the ozone NAAQS;

• A commitment that, once redesignated, the·state will continue to operate an appropriate

monitoring network to 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 statement from major sources;

• Motor vehicle emissions budgets for transportation conformity for the ten-year

maintenance period;

• A commitment to submit a revised maintenance plan eight years after redesignation;

• A commitment to enact and implement additional contingency control measures

expeditiously in the event that future violations ofthe NAAQS occur;

• A list ofpotential contingency measures that would be implemented in such an event.

Illinois' Maintenance Plan has been prepared 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 document describe how U.S. EPA's requirements have been met.

10
3.0 OZONE MONITORING

U.S. EPA's published guidance document, "Procedures for Processing Requests to Redesignate

Areas to Attainment" (September 4, 1992), details specific requirements regarding the collection

and use of ambient air monitoring data needed to support a redesignation request. Before the

Chicago NAA can be redesignated, Illinois must demonstratethat the NAAQS for ozone, as

published in 40 CFR 50.4, has been attained. Ozone monitoring data must show that violations

ofthe NAAQS are no longer occurring within the nonattainment area. This showing must rely

on three complete, consecutive calendar years ofquality assured data. Further, the air

monitoring data must be quality assured in accordance with 40 CFR 58.10, recorded in U.S.

EPA's AQS data base, and made available to the public. Finally, Illinois must commit to

continue to operate an appropriate monitoring network to verify the maintenance ofthe

attainment status, once the area has been redesignated.

The following subsections describe how each ofthese requirements has been addressed.

3.1 Monitored Design Values

Currently there are 55 ozone monitors located in the nonattainment counties in the Lake

Michigan region; 9 are located in northwestern Indiana, 17 in northeastern Illinois, 13 iIi western

Michigan, and 16 in eastern Wisconsin.

Figure 3.1 Ozone Monitors in the Lake Michigan Area

11
To detennine whether the NAAQS is being exceeded, the design value must be calculated. The

current U.S. EPA method for calculating the ozone design value is to average the 4th highest

daily maximum 8-hour value for each year over the 3-year period. The calculated 8-hour ozone

design values for the monitors in the Lake Michigan region for 2006-2008 are included as

Appendix A ofthis report. Figure 3.2 compares the design values for the 2001-2003 period for

monitoring stations in the Lake Michigan region to the corresponding design values from 2006-

2008. The data demonstrate that ozone air quality has improved dramatically throughout the

Lake Michigan region and that the NAAQS for ozone has been attained for the 2006-2008 period

at all locations except Holland, Michigan.

Figure 3.2

Comparison of 8-Hour Ozone Design Values for the Lake Michigan Region

Between 2001-2003 and 2006-2008*

2001-2003 2006-2008*

*Data for 2008 are preliminary and subject to final verification.

3.2 Quality Assurance

12
Illinois EPA has quality assured all data shown in Appendix A in accordance with 40 CFR

58.10 and the Illinois EPA's Quality Assurance Plan, which describes Illinois EPA's standard

operating procedures for operating the ambient monitoring network and validating the data.

Illinois EPA has recorded the data in the U.S. EPA's AQS database, which is available to the

public.

3.3 Continued Monitoring

Illinois commits to continue monitoring ozone levels according to a U.S. EPA approved

monitoring plan, as required to ensure maintenance ofthe ozone NAAQS. Should changes in the

location of an ozone monitor become necessary, Illinois EPA will work with U.S. EPA to ensure

the adequacy ofthe monitoring network. Illinois EPA will continue to quality assure the

monitoring data to meet the requirements of 40 CFR 58. Illinois EPA will continue to enter all

data into AQS on a timely basis in accordance with federal guidelines.

13
4.0 EMISSIONS INVENTORY

A redesignation request must contain a demonstration that the improvement in air quality

between the year that violations occurred and the year that attainment was achieved is based on

permanent and enforceable emission reductions. As described previously in Section 3.0, a threeyear monitoring period is used to evaluate whether attainment has been achieved. In this

Section, the "attainment year" refers to the first year (2006) ofthe three-year period (2006-2008)

used to demonstrate attainment. The request should also include a projection ofthe emission

inventory to a year at least 10 years following redesignation, a demonstration that the projected

level of emissions is sufficient to maintain the ozone NAAQS, and a commitment to provide

future updates ofthe inventory to enable tracking of emission levels during the 10-year

maintenance period.

4.1 Attainment Year Inventory. 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 of ozone (VOM and NOx) for the attainment year, 2006. This inventory is based on

Illinois EPA's SIP submittal entitled, "Illinois Base Year Ozone Inventory for 2002", (June

2006). Point source information was compiled from 2006 annual emission reports submitted to

the Illinois EPA by emission sources and the U.S. EPA's Clean Air Markets 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 calculated using 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 Nonattainment Area

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

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4.2 Air Quality Improvement and Emission Controls

TheChicago area was.designated nonattainment in 2004, based on ozolle air qu~litympnitoring

data collected between 2001 and 2003. Since that time, permanent and enforceable reductions of

ozone precursor emissions have contributed to improvements in ozone air quality and to the

attainment ofthe ozone NAAQS. Some ofthese emission reductions were due to the application

oftighter federal emission standards on motor vehicles 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 oftheir regulatory status. In this subsection, the

emission levels 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-hour ozone 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 of ozone

precursor emissions. The base year inventory included emissions from point, area, on-road

mobile and off-road mobile emissions. Illinois EPA prepared and submitted this inventory in

June 2006. Table 4.2 summarizes 2002 emissions by major source category and by pollutant for

the Illinois portion ofthe Chicago nonattainment area.

Table 4.2

2002 Chicago Ozone Nonattainment Area

VOM and NOx Emissions

(Emissions stated in tons per ozone season weekday)

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-Road Mobile 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 decreased by 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 decreased by 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 air quality in the Chicago area,

ultimately resulting in attainment ofthe 8-hour ozone NAAQS.

15
4.3 Emission Projections

A maintenance plan must contain a demonstration that the level of emissions projected for the

ten-year period following redesignation are sufficient to maintain the ozone NAAQS.

Accordingly, Illinois EPA has projected YOM and NOx emissions for the Illinois portion ofthe

Chicago nonattainment area for 2020. Illinois EPA has also projected emissions to 2013, to

represent a midpoint during the ten-year maintenance period. Emissions for these two projection

years are compared to emission levels in 2006 to determine if emissions are sufficient to

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

projected by applying category-specific growth factors to estimates contained in the 2002 base

year inventory. County population projections for 2007 and 2012 were used to estimate

emissions for categories which rely on a per capita emissions factors. Off-road emissions

projections were also developed using the 2002 inventory and growth factors contained in U.S.

EPA's NONROAD model. On-road motor vehicle emissions were estimated using U.S. EPA's

MOBILE6 motor vehicle emissions model. The figures assume the continued use of

reformulated gasoline, the continued phase-in ofthe Tier 2 motor vehicle emissions standards,

and operation of an enhanced vehicle inspection and maintenance program. Total vehicle miles

oftravel (VMT) for 2013 and 2020 were assumed to increase at a rate of 1.27 percent per year

from 2002.

Tables 4.3 and 4.4 include the YOM and NOx emissions estimates for the years 2013 and 2020,

respectively, for the Illinois portion ofthe Chicago nonattainment area.

Table 4.3

2013 Chicago Ozone Nonattainment Area

VOM and NOx Emissions

(Emissions stated in tons per ozone season weekday)

Source CateJ1;ory VOM NOx

Point Sources 70.27 155.02-

Area Sources 266.33 - 37.58

On-Road Mobile Sources 77.58 148.78

Off-Road Mobile Sources 122.82 249.28

Total 537.00 590.66

16
Table 4.4

2020 Chicago Ozone Nonattainment Area

YOM and NOx Emissions

(Emissions stated in tons per ozone season weekday)

Source Cate~orv YOM NOx

Point Sources 81.43 153.12

Area Sources 293.25 39.62

On-Road Mobile 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 of emissions projected for the ten-year period following

redesignation is sufficient to maintain the ozone NAAQS. As shown in the table, both YOM and

NOx emissions within the nonattainment area are expected to decrease significantly between

2006 and 2020. Projected YOM and NOx emissions for the mid-point year, 2013, are also less

than the emission levels in 2006. Based on these emission trends it is expected that air quality

will continue to meet the 8-hour ozoneNAAQS throughout the maintenance period.

In addition to the overall emission reductions projected to occur within the nonattainment area,

significant reductions 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 of 2006, 2013 and 2020 Emission Estimates

Chicago Nonattainment Area

(Emissions stated in tons t er ozone season weekda r)

2006 2013 2020

YOM 625.56 537.00 559.90

17
NOx 812.05 590.66 518.37 I ----------'"--------

Table 4.6

Estimated NOx Emission Reductions From Utility Boilers

Resulting from Implementation ofIllinois' Multi-Pollutant Standards

(Emissions stated in tons J: er ozone season weekday)

2006 NOx Emissions 323

2012 NOx Emissions 163

Net reduction 160

4.5 Provisions for Future Updates

As required bySection 175A(b) ofthe CAA, Illinois commits to submit to U.S. EPA, eight years

after redesignation, a revised version ofthis Maintenance Plan. The revision will contain '

Illinois' plan for maintaining the 8-hour ozone NAAQS for ten years beyond the first lO-year

period after redesignation.

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5.0 CONTROL MEASURES AND REGULATIONS

This section provides specific infonnation on the control measures implemented in the Chicago

nonattainment area, including the measures that were part ofIllinois' Attainment Demonstration,

Reasonable Further Progress (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, or to provide equivalent emissions levels using alternate measures. Illinois' SIP

contains acceptable provisions to provide for preconstruction review of new emission sources.

After redesignation to attainment, Prevention of Significant Deterioration (PSD) requirements

will apply to the construction of new major sources and to significant modifications of existing

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 nonattainment area identifies control

measures that have been promulgated at either the 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: "Attainment Demonstration for the 1997 8-Hour Ozone National Ambient Air

Quality for the Chicago Nonattainment Area" (Report Number AQPSTR 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) and National Emission Standards for

Hazardous Air Pollutants (NESHAPS)/Maximum Achievable Control

Te~hnology (MACT) Standards

o YOM Solvent Categories: Aerosol Coatings, Architectural and Industrial

Maintenance (AIM) Coatings, Consumer Solvents

o Enhanced Vehicle Inspection & Maintenance Program

o ReforIlJ.ulated Gasoline

o Tier 2 Motor Vehicle Emissions Standards and Gasoline Sulfur Control

Requirements

o On-Highway Heavy-Duty Engine and Vehicle Standards and Highway Diesel

Fuel Sulfur Control Requirements

19
o Federal Control Programs Incorporated into NONROAD Model (e.g., Nonroad

Diesel Rule), plus Evaporative Large Spark Ignition and Recreational Vehicle

Standards

o Tier 4 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, Archer Daniels Midland

5.2 Reasonable Further ProgressJRFP)

Since the Chicago region is classified as a moderate nonattainment area for the 8-hour ozone

standard, a 15 percent net reduction in YOM emissions from 2002 levels is required by 2008 in

order to meet the RFP requirement. The Illinois EPA has not relied on NOx substitution to 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 Nonattainment Area

8;.Hour Ozone and Annual PM2.5 Reasonable Further Progress Demonstration", (Report

Number AQPSTR 08-06, November 2008). The control measures identified in the RFP

document, including those listed above, will result in a 20.0 percent reduction in YOM emissions

from 2002 emissions levels by the year 2008. In addition, continuing reductions in 2009 and

2010 are estimated to result in year 2010 VQMemissions at 23.85 percent below 2002 levels.

These emission reductions easily achieve the 15% RFP target for the Chicago nonattainment

area.

20
5.3 Reasonably Available Control Technology (RACn

Pursuant to Sections 172, I82(b) and (f) ofthe CAA, RACT is required for all existing major

sources ofthe applicable criteria pollutant and its precursors (VOM and NOx) located in NAAs.

U.S. EPA defines RACT as the lowest emission limitation that a particular source is capable of

llleetingby the application of control 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 of emissions from all units at the source determines if

a unit is major and thus subject to RACT requirements.

RACT is not a new requirement under the CAA. Illinois previously addressed RACT

requirements in the Chicago area in developing attainment plans for the I-hour ozone standard.

The RACT requirement for NOx was previously waived under the I-hour ozone standard, and

Illinois must adopt new regulations to implement NOx RACT in the NAA. However, Illinois

has previously adopted RACT requirements for YOM emissions in the NAA. (See 35 Ill. Adm.

Code Part 219) The Illinois EPA has evaluated the previously adopted regulations to determine

ifthe RACT requirement is still being met for 8-hour ozone.

Sections 172, 182(b)(2), and 182(f) ofthe CAA require implementation ofRACT for sources

that are subject to Control Techniques Guidelines (CTGs) that are promulgated by U.S. EPA.

The U.S. EPA has issued CTGs defining RACT for those categories ofsources that emit the

greatest amounts ofVOM emissions. Illinois EPA will soon be proposing regulations to

implement the revised CTGs issued by the U.S. EPA in 2006. Other than the 2006 CTGs,

Illinois has adopted applicable rules addressing all CTGs published by U.S. EPA for which there

are existing sources in the Chicago NAA.

Non-CTG sources are defined as major YOM sources which are not subject to CTGs, but for

which RACT is required. All major sources of ozone precursors located in the ozone NAA that

are not subject to individual RACT rules are subject to a generic RACT rule. These rules apply

to non-CTG sources that have the potential to emit 100 tons or more per year ofVOM. Thus,

Illinois has met the obligation to implement RACT on non-CTG YOM sources in the NAA.

It should be noted that other regulatory requirements also affect YOM emission sources within

the Chicago ozone NAA. These include Maximum Achievable Control Technology (MACT),

federal New Source Performance Standards (NSPS), and National Emission Standards for

Hazardous Air Pollutants (NESHAPS). These programs satisfy the RACT requirements for

specific source categories because these rules are more stringent than RACT.

It is concluded from this review that Illinois' existing YOM RACT rules fulfill U.S. EPA's

RACT requirements for YOM sources in the NAA. As mentioned previously, however, the

RACT requirement for NOx was previously waived under the I-hour ozone NAAQS. With

respect to the 8-hour ozone NAAQS, Illinois will not pursue the NOx waiver, so Illinois must

adopt new regulations to implement NOx RACT in the NAA. The Illinois Pollution Control

Board (Illinois PCB) is now considering a regulatory proposal prepared by the Illinois EPA. The

21
Illinois EPA will submit Illinois' NOx RACT rules as a SIP revision once these requirements

have been adopted by the Illinois PCB.

5.4 Controls to Remain in Effect

Illinois will maintain all ofthe control measures listed in this Section to ensure maintenance of

the 8-hour ozone NAAQS. Any revisions 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

accompanied by a showing that such changes will not interfere with maintenance ofthe NAAQS.

Illinois EPA has the necessary resources to enforce any violations ofits rules or permit

provisions. After redesignation, it intends to continue enforcing all rules that relate to the

emission ofozone precursors in the Chicago nonattainment area.

5.5 Provisions for Permitting New or Modified Emission Sources

Illinois has longstanding and fully implemented programs for the review ofnew major sources

and significant modifications of existing sources. The Prevention ofSignificant Deterioration

(PSD) program, which includes requirements for Best Available Control Technology (BACT) on

major new sources or significant modifications of existing sources, will be applicable in the

Chicago area once the area has been redesignated to attainment. Illinois has been delegated full

authority to implement the PSD program by 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-hour ozone Maintenance Plan SIP. Average

summer weekday motor vehicle emissions budgets are being proposed for the final year ofthe

Maintenance Plan, 2020, and for the precursor pollutants YOM and NOx. These budgets were

developed consistent with the motor vehicle activity assumptions and emissions control

strategies incorporated'into the 8-hour ozone attainment demonstration analysis. The budgets

reflect an emissions level determined using motor vehicle VMT and fleet mix provided by the

Chicago Metropolitan Agency for Planning (CMAP) and are consistent with the emission levels

used in the attainment demonstration.

A motor vehicle emissions budget is that portion ofthe total allowable emissions allocated to

highway and transit vehicle use that are defined in the SIP for a certain year. The rules

governing transportation conformity require certain transportation activities to be consistent with

motor vehicle emissions budgets contained in control strategy implementation plans (40 CFR §

93.118). Section 93.101 ofthe rule defmes a "control strafugy [State] implementation plan

revision" as a "plan which contains specific strategies for controlling the emissions and reducing

ambient levels ofpollutants in order to satisfy CAA requirements ofreasonable further progress

and attainment." In order to demonstrate conformity to the motor vehicle emissions budget,

emissions from the implementation of a transportation plan or a transportation improvement

22
program must be less than or equal to the budget level (40 CFR § 93.118(a)).

The motor vehicle emissions budgets established and described herein were developed consistent

with the methodology and control strategy assumptions used in the 8-hour ozone attainment

demonstration. The effects ofmotor vehicle control measures are incorporated into the

emissions factors produced by the U.S. EPA's MOBILE6 model. These control measures

include motor vehicle emissions standards, the operation of a vehicle inspection and

maintenance (11M) program, and the required use ofreformulated gasoline and low sulfur

gasoline and diesel fuel.

Using the above VMT and control program assumptions and methodology, following are the

year 8-hour ozone motor vehicle emissions budgets, stated in tons per ozone season weekday, 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 per ozone season weekday)

Pollutant

VOM 56.07

NOx 79.09 .'

Complete detail on the derivation ofthe motor vehicle emissions budgets, including discussion

ofthe MOBILE6 model inputs and aSsumptions is included in Appendix B ofthis report.

23
6.0 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 if violations ofthe 8-hour ozone

NAAQS are measured after redesignation to attainment. A list of potential contingency

measures that would be implemented in such an event should also be included in the

Maintenance Plan. Finally, the plan should provide a commitment to submit a revised

maintenance plan eight years after redesignation to ensure continued maintenance for the next

ten-year maintenance period.

Contingency measures are intended to provide further emission reductions in the event that

violations ofthe 8-hour ozone NAAQS occur after redesignation to attainment. While these

measures do not need to be fully adopted by the IPCB prior to 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 that the 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 that violations ofthe 8-hour ozone NAAQS occur within the

Chicago maintenance area after redesignation to attainment. Further, lllinois commits to

continue to implement the 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 a range of control measures that will greatly reduce precursor emissions, both

locally and statewide. The contingency plan anticipates that these emission reductions will be

sufficient to mitigate exceedances or violations ofthe NAAQS that may occur in the coming

years without further regulatory action.

The contingency plan prov,ides for different levels of corrective responses should ambient 8-hour

ozone levels exceed the NAAQS in any year, if emissions in the NAA increase significantly

above current attainment levels, or ifthe NAAQS is violated. A Level I response would occur in

the event that: 1) the 8-hour ozone design value at any monitoring site in the Chicago NAA

exceeds 84 ppb in any year, or 2) ifVOM or NOx emissions increase more than 5% above the

levels contained in the attainment year (2006) emissions inventory. It should be noted that U.S.

EPA does not require a state to implement contingency measures when occasional exceedances

are recorded. !EPA's voluntary commitment to initiate a Level I response is intended to prevent

future violations ofthe NAAQS from ever occurring.

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 other Lake Michigan

24
Table 6.1

Contingency Plan for the Chicago 8-Hour Ozone Nonattainment Area

Contingency Measure Action to be Taken List of Potential Contingency Measures Trieeer

Level I Trigger Point Source Measures

IL will evaluate air quality, or • IL Multi-Pollutant Program for

• Monitored ambient determine if adverse 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 • Other measures 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. Sulfur Fuel

• Heavy Duty Diesel Standards and Level II Trigger IL will conduct a thorough 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 shall be completed within 6 • Other measures to be identified the Chicago months. Selected measures shall be

maintenance area. implemented within 18 months of a Area Source Measures violation.

• ArchitecturallIndustrial

Maintenance (AIM) Coatings

• Commercial and Consumer

Products . • Aerosol coatings

• Broader geographic applicability

of existing measures

• Other measures to be identified

states to evaluate the causes ofhigh ozone levels or the emissions trends and to determine

appropriate control measures needed to assure continued attainment of 8-hour ozone NAAQS.

Under Level I, measures that could bi implemented in a short time would be selected so as to be

in place quickly after the Illinois EPA is aware that corrective measures have been triggered.

Control measures selected under Level I will be adopted in most cases within 18 months after a

determination is made, and implemented, generally, within 24 months of adoption by the IPCB.

25
A Level II response would be implemented in the event that 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 other Lake

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 ofthe ambient ozone concentrations;

• the weather patterns contributing to ozone levels;

• potential, contributing emissions sources;

• the geographic applicability ofpossible contingency measures;

• emissions trends, including timeliness 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 or from any other measure

deemed appropriate and effective at the time the selection is made. This list of contingency

measures is comprehensive, and it is expected that only a few ofthese measures would be

required. The selection between measures 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 later than 18 months after lllinois

makes a determination, based on quality-assured ambient data, 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

prior to 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 for public hearing, and other measures required by Illinois

law.

Should additional control measures be necessary, such rules would be adopted pursuant to

Section 28.5 ofthe Illinois Environmental Protection Act, Illinois' provisions for fast-track

rulemaking (415 ILCS 5/28.5). Section 28.5 enables such rules to be adopted within twelve

months ofproposal to the Illinois Pollution Control Board.

6.2 Commitment to Revise Plan

As noted in Section 4.5 above, Illinois commits to review its Maintenance Plan eight years after

redesignation, as required by Section 175(A) ofthe CAA. The Maintenance Plan revision is

intended to ensure continued attainment ofthe 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 a public hearing

prior to adoption ofthis Maintenance Plan and submittal to U.S. EPA. Public participation in the

SIP process is provided for as follows:

• Notice of availability ofthe Maintenance Plan document and 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 part ofthe submittal to U.S. EPA.

6.4 Legal Authority to Implement and Enforce

The Maintenance Plan must contain a demonstration that the State ofIllinois has the necessary

legal authority to implement and enforce the measures relied upon to attain and maintain the

NAAQS. Illinois has the legal authority to implement and enforce the requirements ofthis SIP

submittal pursuant to the Illinois Environmental Protection Act.

27
7.0 CONCLUSIONS

The Chicago nonattainment area has attained the 8-hour ozone NAAQS 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 that the Chicago NAA has attained the 8-hour ozone 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 Air Act. This

Maintenance Plan provides for the continued attainment ofthe 8-hour ozone NAAQS for a

period often years after U.S. EPA has formally redesignated the area to attainment. This

Maintenance Plan provides adequate contingency measures for potential, additional emission

reductions in the event that future 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' year 2006, and has prepared a projection 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 in future years. Illinois commits to continue to operate an

appropriate monitoring network to verify the maintenance ofthe attainment status once the area

has been redesignated. TIlinois EPA has the legal authority to implement and enforce all control

measures.

This Maintenance Plan has been prepared 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 of Ambient Air Monitoring Data

(2006-2008)

29

Table A.I

2006-2008 8-hour Ozone Design Values

for Monitors in the Lake Michigan Region*

State of Illinois

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 high values for 2008 valid thru 10/14/08 for I11inois, 9124/08 for Indiana, 9130/08 for Michigan, and 9129/08 for Wisconsin.

31
State of Michigan 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 subject to final verification. Fourth high values 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-hour NAAQS. An average summer weekday motor vehicle 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 motor vehicle activity assumptions (e.g., fleet mix, registration distribution...)

and emissions control strategies incorporated into the 8-hour ozone attainment

demonstration analysis.

Background

Section 176(c)(4) ofthe Clean Air Act Amendments of 1990 requires that transportation

plans, programs, and projects which are funded or approved under Title 23 USC must be

determined to conform with State or Federal air implementation plans, A motor vehicle

emissions budget is that portion ofthe total allowable emissions allocated to highway and

transit vehicle 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 controlling the emissions and reducing ambient levels of

pollutants in order to satisfy Clean Air Act ("CAA") requirements ofreasonable further

progress and attainment." In order to demonstrate conformity to the motor vehicle

emissions budget, emissions from the imple.mentation ofa transportation plan or a

transportation improvement program ("TIP") mu.st be less than or equal to the budget

level (40 CFR § 93.118(a».

Transportation conformity will be based on these submitted on road motor vehicle

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 motor vehicle1emissions budgets in this submittal are

adequate as each ofthe six criteria under §93.118(e) is satisfied. These six criteria

include:

34
1. The submitted control strategy implementation plan revision or maintenance plan was

endorsed by the Governor (or his or her designee) and was subject to a State public

hearing.

2. Before the control strategy implementation plan or maintenance plan was submitted

to EPA, consultation among federal, State, and local agencies occurred: full

implementation plan documentation was provided to [US]EPA; and [US]EPA's

stated concerns, if any, were addressed;

3. The motor vehicle emissions budgets(s) is clearly identified and precisely quantified;

4. The motor vehicle emissions budget(s), when considered together with all other

emission sources, is consistent with all applicable requirements for reasonable further

progress, attainment, or maintenance (whichever is relevant to the given .

implementation plan submission);

5. The motor vehicle emissions budget(s) is consistent with and clearly related to the

emissions inventory and the control measures in the submitted control strategy

implementation plan revision or maintenance plan, and

6. Revisions to previously submitted control strategy implementation plans explain and

document any changes to previously submitted budgets and control measures,

impacts on point and area source emissions; any changes to established safety

margins; and reasons for the changes (including the basis for any changes related to

emission factors or estimates of vehicle miles traveled).

This State Implementation Plan and the associated motor vehicle emissions budgets have

been developed by the Illinois EPA, the designated air quality agency for the State of

Illinois. The required public hearing to accept public comment on the proposed motor

vehicle emissions inventory will be held at 9:00 AM, on December 16, 2008 in Room 9-

031 ofthe James R. Thompson Center in downtown Chicago. Notification ofthis

hearing was printed in the Chicago Sun Times on November 15, 2008. Comments on

the proposed attainment demonstration and motor vehicle emissions budgets will be

accepted for 30 days after the 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

motor vehicle emissions budgets. The consultation Team includes representatives from

the Federal Highway Administration, Federal Transit Authority, 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 length by the LADCO Project Team, which includes

a repres~l}tative from the U.S. EPA Region V office. The draft Maintenance 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 that the Chicago nonattainment area has attained the 8-hour

ozone standard promulgated in 1997. This draft Maintenance Plan includes

nonattainment area emissions estimates for all emissions sectors for the attainment year,

2006 and for the ~ast year ofthe proposed maintenance year 2020. The Maintenance Plan . must demonstrate that emissions throughout the Maintenance plan time frame are less

than emissions in the ~ttainment year. The motor vehicle emissions estimate in the final

year ofthe maintenance plan is also established as a cap, or "budget", for us in the

transportation conformity process.

The m?tor vehicle emissions budgets established and described herein were developed

considtent with the methodology and control strategy assumptions used in the 8-hour

ozone Attainment Demonstrations as well as the 8-hour ozone RFP plan. The effects of

these controls are incorporated into the emissions factors produced by the USEPA's

MOBILE6 model. Following is a discussion ofthe inputs and assumptions incorporated

36
into the developmentofthe proposed Maintenance Plan motor vehicle 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 attainment year 2009 using an area-wide vehicle miles traveled (VMT) growth rate

of 1.27 percent per year, determined through consultation between the TIlinois EPA,

CMAP, and LADCO. This growth rate has also been applied to project year 2020 VMT.

Using this growth rate, the projected 2020 ADVMT level for the Chicago NAA was

201.8 million miles. To account for ozone season weekday traffic, the average daily

VMT estimates were multiplied by Chicago area and facility type -specific AverageDaily-to-Average Summer Weekday conversion factors supplied by mOT. Applying

these factors resulted in an average summer weekday VMT *(ASWVMT) that is 11.3

percent greater than the average daily VMT. Applying this·11.3 percent factor yields a

year 2020 ASWVMT total of224.6 million. Following is a summary ofthe information

and MOBILE6 model assumptions used included in the development ofthe draft motor

vehicle emissions budgets.

Year: VMT estimates and motor vehicle emissions factors ~ere developed

representative ofsummer 2020

Typical Ozone Season Weekday: The 2002 Chicago Area ozone precursor emissions

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 affected by this choice oftemporal time frame are the temperature and the

adjustment ofVMT to account for increased travel during the summer.

..

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

37
the use ofrepresentative summer daily temperatures. For future years, the representative

summer temperatures 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 summer climatological temperatures in the region

as calculated from local climatological data published by the National Weather Service.

A climatological average Summer weekday absolute humidity value of97 grains ofwater .

(vapor) per pound of dry air was calculated for O'Hare Airport.

Motor Vehicle Emission Controls: The primary motor vehicle emission control

programs that will be in place in the Chicago NAA in 2020 are (1) an OBD-II-based

vehicle emissions testing program, and the requirement that gasoline sold in the area be

"reformulated gasoline", fuel that is specially formulated to reduce emissions.

Inspection and Maintenance (11M): The 11M program in effect since

2007 requires biennial On-Board Diagnostics (OBD) testing on all model year

(MY) 1996 and newer (MY96+) light duty gasoline vehicles, and biennial exhaust

idle and gas cap testing on MY96+ heavy duty gasoline vehicles including

gasoline-powered buses, 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 after the Illinoislegislature amended the Illinois Vehicle

Inspection law in 2005 to (a) drop dynamometer testing ofvehicles, (b) require an

OBD-based program beginning in February 2007, and (c) remove the requirement

for testing compliant pre-MY-1996 vehicles. (Motorcycles and diesel vehicles

are not subject to 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 generated by vehicles

38
that come from outside the testable area and are therefore not required to undergo

lIM testing. Conversely, some VMT in an area without liM (such as Grundy

County's NAA townships) may be generated by lIM vehicles from a neighboring

testable area. The VMT estimates used when calculating lIM emission credits for

a county or township must be adjusted to 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 Cook and DUPage Counties (that is, 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 plan both assume all gasoline sold in

the Chicago NAA since 1995 is ''Northern'' RFG, and that this will continue through and

beyond 2008 and 2009. Although a small amount ofnon-RFG fuel comes into the NAA

in the fuel tanks of vehicles from outside the area, it is assumed that the use ofnonreformulated gasoline fuel in the Chicago area is negligible.

Gasoline Sulfur: Gasoline sulfur levels were assumed to be 30 parts per million

(ppm) in 2020 in accordance with the federal Tier 2 gasoline regulations which

required the 30 ppm level beginning in 2006.

Diesel Sulfur: Diesel sulfur levels were assumed to be 15 parts per million in

2020 in accordance with the U.S. EPA's Highway Diesel Rule which was

finalized in January 2001. This regulation required the sale of on-road diesel fuel

with no greater than 15 ppm ofsulfur beginning in June 2006.

39
Speeds: For the 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 and ramps have a fixed speed in

MOBILE6), and was based on transportation model output (modeled speeds on links of

various classes ofroads by modeling period) from CMAP (CATS) for the year 2007 (the

most recent available). This speed distribution is assumed valid for 2020 as well.

VMT Mix: The regional VMT mix inputs used for 2020 were based on Chicago-areaspecific 2005 VMT-by-vehicle-type data supplied by IDOT, modified to reflect expected

changes in the ratio ofcars to light trucks. This information is used in the MOBILE_

model to compute the average emission factors for certain combined vehicle classes, and

the all-vehicle emission rate.

Registration Distribution: A Chicago-area-specific vehicle registration distribution

profile based upon 2003-04 information data was supplied by Illinois EPA's Division of .

Mobile Source Programs from data provided by the Illinois Secretary ofState's

Department ofMotor Vehicles.

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 ASWVMT by FC) * (VMT Mix by VT and FC) * No-11M emission factors

(EF) by pollutant, VT, and FC) * 1.102 (grams to ton conversion factor). For areas

without 11M, this is the only calculation.

2. 11M Credits by VT and FC =(County ASWVMT by FC) *(VMT Mix by

VT and FC) *(No-11M EF - 11M EF [both by pollutant, VT, and FC]) * 11M coverage

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

40
3. Net County Emissions by VT and FC =(11M County Emissions by VT 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 spreadsheet which

automatically calculates emissions and IIM credits by county or township for each

pollutant, VT, and FC, sums them by VT and FC, and aggregates them into area totals.

Attachment A ofthis section provides additional details on the MOBILE6 model inputs

used in the development ofthe 2020 Chicago NAA motor vehicle emissions budgets.

.Motor Vehicle Emissions Budgets

Using the above VMT and control program assumptions and methodology, following are

the 8-hour ozone 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 per ozone season weekday)

Pollutant Emissions

VOM 56.07

NOx 79.09

41
Attachment A

Transportation Conformity

External MOBILE6.2 Inputs:

In the examples of external fIles shown below, 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 may therefore be omitted, but it is suggested that they remain in

the fIles for documentation, and to make the files easier for the user to read and

understand.

The comments and other text in the External Files have been shown in the Courier

New typeface. Actual command lines-the inputs that MOBILE 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 that the lines would fit 'Yithin the margins ofthe page. This makes them easier

to read.

Vehicle Inspection 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 account by assuming that 75% ofthe vehicle

fleet subject to IIM has been tested under the IM070N program by that time, and that the

other 25% have been tested under the ILLOBDIM in late 2006 and have not yet come up

for retesting under IM070N by summyr 2008 (both programs are biennial). By summer

2009,all vehicles subject to IIM will have been tested under IM070N, so this question

does not arise: the IIM emission rate is simply that for 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 must be numbered consecutively. Illinois EPA

begins IM070N.D with identifYing comments, and adds other comment lines or blank

42
lines to make the file easier to read and understand. Programs after the first need

comparatively few comments because 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 number after the colon refers to the VM program's

. component number.

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

Testing began in 1986 and runs into the indefinite future (2050). The program

is a biennial test-only (2 T/O, here and in other program components) program,

in this case an Evaporative On-Board Diagnostics (OBD) test. The On-Board

Diagnostic program in a vehicle's engine computer records information from

sensors in the engine and fuel system. Indications ofmalfunctions or out-ofspecification operations ofthe engine or fuel and evaporative emission control

systems are stored in the engiJ,le computer as "fault codes". An OBD test

consists of plugging a speciallscanner into an output jack from vehicle's engine

computer. The scanner queries the computer and records any fault codes that

the computer's OBD system hassaved. OBD tests are quick, dependable, and

clean, and, if a vehicle fails an OBD test, the fault codes that the scanner

displays help mechanics diagnose the problem.

43
..

lIM MODEL YEARS : 1 1996 2050

This program component covers only vehicles manufactured between model

year (MY) 1996 (start year) and the indefinite future (MY 2050, the end year).

More and more vehicles are becoming 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 light trucks [LDGTs

1,2,3, and 4]) are covered by this program component (22222). Heavy-duty

gasoline trucks (eight types) and gasoline buses are not covered by this program

component (11111111 1), but rather by Programs 3 and 4, described below.

lIM STRINGENCY : 1 20.0

Stringency (exhaust inspection failure rate) is 20%. A Stringency entry is necessary for

an Exhaust test, but not an Evaporative test, so this entry can be omitted or "commented

out". In this Evap test case, it will be ignored by the model, but is included for

reference.

lIM COMPLIANCE : 1 95.0

95%'

Compliance rate (tested vehicles as percent of all vehicles subject to 11M) is

lIM WAIVER RATES : 1 0.5 2.2 '01 data

The Waiver Rate is the fraction oftested vehicles that get a waiver-i.e., do not

pass the 11M test but, because repairs cost more than a specified amount, get a

certificate of compliance. Waiver rate is 0.5% for MY 1980 and earlier vehicles

(irrelevant now that pre-MY-96 vehicles are not tested), and 2.2% for MY 1981

and later vehicles. These figures are from VIM's actual 2001 waiver statistics,

and have been representative ofthe last few years:

lIM EXEMPTION AGE : 1 25

~. Vehicles older than 25 years are not subject tO,this program. This will not

happen until at least 2021. The default is 25, and the model does not calculate

benefits for vehicles older than 25 years, so in essence this command has no

effect. It could be omitted, but is included for completeness.

lIM GRACE PERIOD : 1 4

Vehicles less than 4 model years 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 after each 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 second program component is a biennial, test-only Exhaust OBD test for

MY 1996 and later LDGVs and LDGTs. In this OBD test, the scanner queries

the vehicle's computer for fault codes concerning exhaust emissions.

Stringency, Compliance, Waiver Rates, Exemption Age, and Grace Period are

the same as in the first program. An entry for lIM STRINGENCY (20%) is

required for an Exhaust IIM program.

*-----------------------------------~------------------

* 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 third program component is a biennial, test-only Idle test for MY 1996 and

later HDGVs and Gas Buses (222222222). Light-duty vehicles are not subject

to this component (11111), but rather to components 1 and 2. Stringency,

Compliance, Exemption Age, and Grace Period are the same as in component 1,

but the pre- and post-MY 1981 Waiver Rates (1.2% and 1.5%, respectively), are

slightly different from those in components 1 and 2. HDGVs are few in

number, and most ofthem are commercial vehicles.

* 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 Check for MY

1996 and later HDVs. Compliance, Waiver Rates, 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 shown below:

* 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 ofthat type that is made up of vehicles of a given age.

The following is based on 2003 registration data from the Illinois Secretary of State'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 not used) from the 2001 RD file (CHIRD01) for

historical and reference purposes. As noted above, those data may be 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)

48
13 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 year and the 2008 and 2009 future year

estimates.

VMT by 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. It based on the

most recent complete data from CMAP on VMT by hour by vehicle class. This is a very

long file -about 750 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 second paragraph ofthe introduction to 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 for Vehicle Types7 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 fqf Vehicle 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 after Vehicle Type 28.]

VMT by Hour ofthe Day

The MOBILE6.2 default file is HVMT.D. The most current Chicago-area-specific file is

HVMTCH7R.SL, shown below, 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 similar profiles, with morning and afternoon peaks, a

noontime dip, and a minimum about 3AM - 4AM, which is to be expected.

VMT by Speed Bin

The MOBILE6.2 default file is SVMT.D. The Chicago-area-specific Speed-bin file is

SVMTCH07.DEF, shown below. It represents 2007 CMAP transportation model 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

54
distribution 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

For the Chicago. lllinois Ozone Nonattainment Area

The lllinois Environmental Protection Agency (lllinois EPA) will hold a public hearing on

December 16. 2008 at 9:00 a.m. in Room 9-031 at the James R. Thompson Center. 100 West

Randolph Street Chicago. lllinois.

The public hearing will be held by the IDinois EPA Bureau ofAir for the purpose ofgathering

public comments on two draft SIPs related to the 1997 8-hour ozone National Ambient Air

Quality Standard (NAAQS). The IDinois EPA is seeking comments on the draft Attainment

Demonstration, the draft Maintenance Plan, and associated draft motor vehicle emissions

budgets, all ofwhich the lllinois EPA proposes to submit to 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-

hour ozone NAAQS in the Chicago, Illinois nonattainment area. The Illinois EPA intends to

request that U.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-hour ozone NAAQS for at least 10 years

after V.S. EPA redesignates the area to attainment. The SIP revisions will also establish new

motor vehicle emissions budgets for the years 2009 and 2020 for the nonattainment 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 for the nonattainment area to be established pursuant to the 2008 ozone NAAQS

revision.

Copies ofthese draft SIP submittals for the Chicago, TIlinois nonattainment area may be viewed

by the public prior to the hearing during regular business hours (Monday through Friday 8:30

a.m. until 4:30 p.m., except for State holidays) at the lllinois EPA's offices at 9511 West

Harrison Street in Des Plaines, Illinois, as well as on lllinois EPA's website at

http://www.epa.state.i1.us. No walk-in requests for copies ofthis material will be

-accommodated. Requests and public inquiries should be directed to Rachel Doctors at the

address below.

The hearing will be held under the provisions ofthe lllinois EPA's "Procedures for Information

and Quasi-Legislative Public Hearings" (35 TIL Adm. Code 164). Any questions about the

hearing procedures, requests for copies ofthe hearing rules, or requests for special need

interpreters should be 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, but must be postmarked by midnight January 15,2009, and mailed to

Rachel Doctors, lllinois EPA, 1021 North Grand Avenue East, P.O. Box 19276, Springfield,

Illinois 62794-9276, telephone number 217/782-5544 or TDD 217.782-9143.

- ATTACHMENT 2
"J

L-m-l,tl .bUu-~~t1~

~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 --Attainment Demonstration & Maintenance Plan for 8-Hour Ozone for Chicago)

James R. Thompson Center - Room 9-031

Chica2o, Illinois

ScoH-

~D"SSr AreoNS

'-a.~

• •

ATTACHMENT 3