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 Non-Creditable
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  

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

	

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

 PAGE   

Appendix 9D

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