### 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 MOBI LE6.2 runs as described in Appendi x A “Methods to Account for NonCreditable Reductions when Calculating ROP Target s for the 2008 and Later ROP Milestone Years” of the EPA document “Final Rule to Implement the 8-H our Ozone National Ambient Air Quality Standard B Phase 2.” MassDEP used Method 2 for this anal ysis, which involved the following steps:

Step A: 2002 baseline on-road emissions

These MOBILE6 files are identical to those submitt ed 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 wa s 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 wi th all post-1990 CAA measures turned off

### Appendix 9D 2 In addition to the inputs specified in the table belo w, 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” Mo st 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 u sed 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” Ne w 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