Appendix 9D 

1 

Appendix 9D 

Date: July 27, 2007 

To: Eileen Hiney 

 Branch Chief, Air Quality Planning 

From: Craig Woleader, PE 

 Environmental Analyst, I/M Program 

Subject: Reasonable Further Progress (RFP) Analysis

 MOBILE6.2 input files description 

 

The following describes the inputs used in the MOBILE6.2 files for the above referenced project. This 

analysis involved 4 separate MOBILE6.2 runs as described in Appendix A “Methods to Account for NonCreditable Reductions when Calculating ROP Targets for the 2008 and Later ROP Milestone Years” of 

the EPA document “Final Rule to Implement the 8-Hour Ozone National Ambient Air Quality Standard B 

Phase 2.” MassDEP used Method 2 for this analysis, which involved the following steps: 

Step A: 2002 baseline on-road emissions 

These MOBILE6 files are identical to those submitted to EPA previously for the Massachusetts 2002 

Inventory. The following table summarized the inputs for this model run: 

Input Setting Comments 

Calendar year 2002 

Evaluation Month July 

Registration Age 

Distribution 

File “MA_REG02.D” Based on 2001 registration 

data 

I/M Program File “MA_IM02.D” and 

“MA2002CP.D” 

“Low Enhanced” I/M 

program as was operating 

in 2002 

Anti-Tampering 

program 

Part of I/M program As was operating in 2002 

Stage II Refueling 84% effectiveness As was operating in 2002 

Diesel Rebuild Effects 10% As per EPA 

LEV program Files: “MA_LEV2.D”, 

LEV2EXH.D”, LEV2EVAP.D”, 

and “LEV2CERT.D” 

Same as CA LEV program 

Max/Min Temperature 93.7 F, 70.4F 

Fuel Program Northern RFG, 6.7 psi RVP 

Roadway Scenarios Freeway and Arterial, idle to 65 

mph in 1 mph increments 

Step B: 2002 and 2008 on-road emissions with all post-1990 CAA measures turned off 
Appendix 9D 

2 

In addition to the inputs specified in the table below, these two modeling runs also specified no Clean Air 

Act effects using the command “NO CLEAN AIR ACT” as specified by EPA. 

Input Setting Comments 

Calendar years 2002, 2008 

Evaluation Month July 

Registration Age 

Distribution 

“MA_REG02.D” Based on 2001 

registration data 

I/M Program File “MA_OLDIM.D” “Basic” I/M program 

operating prior to “Low 

Enhanced” I/M program 

Anti-Tampering 

program 

N/A Not part of the “Basic” 

I/M program 

Stage II Refueling 84% effectiveness As was operating in 

2002 

Diesel Rebuild Effects 10% As per EPA 

LEV program Files: “MA_LEV2.D”, 

LEV2EXH.D”, LEV2EVAP.D”, 

and “LEV2CERT.D” 

Same as CA LEV 

program 

Max/Min Temperature 93.7 F, 70.4F 

Fuel Program Northern RFG, 7.8 psi RVP 7.8 psi RVP specified by 

Appendix A, Method 2 

Roadway Scenarios Freeway and Arterial, idle to 65 

mph in 1 mph increments 

Step C: 2008 on-road emissions with all CAA and Massachusetts control measures in place 

Input Setting Comments 

Calendar year 2008 

Evaluation Month July 

Registration Age 

Distribution 

See file “MA_REG05.D” Most recent registration 

age distribution, based 

on 2004 I/M program 

data 

I/M Program See file “MA_IM08.D” and 

“MA08_CUT.D” 

“Low Enhanced” I/M 

program as will be 

operating in 2008 

Anti-Tampering 

program 

Part of I/M program As will be operating in 

2008 

Stage II Refueling 84% effectiveness As will be operating in 

2008 

Diesel Rebuild Effects 10% As per EPA 

LEV program Files: “MA_LEV2.D”, 

LEV2EXH.D”, LEV2EVAP.D”, 

and “LEV2CERT.D” 

Same as CA LEV 

program 

Max/Min Temperature 93.7 F, 70.4F 

Fuel Program Northern RFG, 6.8 psi RVP As will be operating in 

2008 

Roadway Scenarios Freeway and Arterial, idle to 65 

mph in 1 mph increments 
Appendix 9D 

3 

Date: November 29, 2007 

To: Eileen Hiney 

 Branch Chief, Air Quality Planning 

From: Craig Woleader, PE 

 Environmental Analyst, I/M Program 

Subject: MOBILE6 Modeling for Calendar Year 2009

 MOBILE6 input files description 

 

The following describes the inputs used in the MOBILE6 files for modeling calendar year 2009. 

Input Setting Comments 

File name 09NEWIM.INP 

Calendar year 2009 

Evaluation Month July 

Registration Age 

Distribution 

File “2005_REG.D” Based on 2004 I&M data 

Diesel Sale Fractions In file “09NEWIM.INP” Based on 2004 I&M data 

I/M Program File “09NEWIM.D” New I&M program slated 

to begin October 2008 

Anti-Tampering 

program 

Not Applicable Will not be part of the new 

I&M program beginning 

October 2008 

Stage II Refueling 84% effectiveness 

Diesel Rebuild Effects 10% As per EPA 

LEV program Files: “MA_LEV2.D”, 

LEV2EXH.D”, LEV2EVAP.D”, 

and “LEV2CERT.D” 

Same as CA LEV program 

Max/Min Temperature 93.7 F, 70.4F 

Fuel Program Northern RFG, 6.8 psi RVP 

Roadway Scenarios Freeway and Arterial, idle to 65 

mph in 1 mph increments 

 Significant changes for 2009 modeling are: 

• The new I&M program scheduled to begin October 2008. 

• End of the Anti-Tampering program in October 2008