From: Vanderspek, Sylvia@ARB [mailto:Sylvia.Vanderspek@arb.ca.gov] 

Sent: Wednesday, March 09, 2016 8:00 AM 

To: Steckel, Andrew <Steckel.Andrew@epa.gov>; Hong, Jeanhee <Hong.Jeanhee@epa.gov> 

Cc: Sutkus, Carol@ARB <carol.sutkus@arb.ca.gov>; Hicks, Austin@ARB <Austin.Hicks@arb.ca.gov> 

Subject: Prop 1 B Benefit calculator information 

The Proposition 1B Goods Movement Emissions Reduction Program (Program) emission reductions identified 

in the Report on Reductions Achieved from Incentive-Based Emission Reduction Measures in the San Joaquin 

Valley dated September 22, 2014 were calculated using the Program’s Goods Movement Online Database 

(GMOD). The purpose of GMOD is to rank potential projects based on emission reductions and costeffectiveness, which results in a list of projects that may be eligible for Program funding. ARB staff made 

adjustments to the calculation methodologies contained in GMOD to take into consideration compliance 

deadlines in ARB’s Truck & Bus Regulation to determine which portion of the reductions meet U.S. EPA’s 

definition of surplus (referred to as “early” and “extra” under Program guidelines). GMOD requires applicants 

to include the percentage of vehicle miles traveled in each specific trade corridor for each project. It provides 

the total project emission reductions which are not apportioned based on the vehicle miles traveled for a 

specific trade corridor. Staff made additional adjustments to account for the emission reductions specific to the 

San Joaquin Valley trade corridor. This provided a methodology to calculate emission reductions from Program 

funded projects that meet U.S. EPA’s criteria for SIP credit. 

In addition to GMOD, the Program also has truck calculators posted on the Program website (“online truck 

calculators”). The Program’s online truck calculators were developed for use by the public to estimate 

emission reductions based on required inputs of mileage, gross vehicle weight rating, old engine model year, 

and new engine model year. As noted above, there are several considerations that are included in ARB staff’s 

methodology for determining SIP creditable emission reductions that are not reflected in these online 

tools. These differences are summarized below. However, both tools provide a publically accessible method 

to determine estimates of the expected emission reductions from individual projects. In addition, a member of 

the public can request and receive all of the necessary information that was used in the calculation submitted 

in ARB’s staff report. 

· Unlike GMOD, the online truck calculators for FY2007-08 and FY2008-09 do not take into 

consideration compliance deadlines in ARB’s Truck & Bus Regulation. The subsequent online truck 

calculators for FY2013-14 and FY2015-16 do take into consideration compliance deadlines to calculate 

reductions. 

· The online truck calculator for FY2008-09 assumes any project with a 2010 or newer engine that 

meets the 0.2 NOx standard is a 2010 model year engine and uses a model year 2010 engine to 

calculate emission reductions regardless of the actual engine model year of the replacement 

truck. GMOD includes further refinements using the actual engine model year of the new truck to 

provide more accurate emission reductions. 

· The online truck calculators do not take into consideration the emissions that occur in each specific 

trade corridor. Staff apportioned the emission reduction results submitted for credit based on the 

percent of vehicle miles traveled in the San Joaquin Valley trade corridor.

Sylvia Vanderspek, Chief 

Air Quality Planning Branch 

Air Quality Planning and Science Division 

Air Resources Board 

(916) 324-7163