UNITED STATES ENVI~ONMENTAL PROTECTION AGENCY 

NATIONAL VEHI CLE AND FUEL EM I SSIONS LABORATORY 

2565 PLYMOUTH ROAD 

ANN ARBOR, MICHIGAN 481 05-2498 

MEMORANDUM Sert 11,2013 

OFFICE OF 

AIR AND RADIATION 

SUBJECT: EPA & General Motors Meeting on Issues Related to Tier 3 NPRM 

FROM: Glenn W. Passavant, Offi,,e of Transportation and Air Quality /' . . ~ 

TO: Public Docket EPA-HQ-OAR-2011-0 135 

A. Introduction 

On August 14, 2013 EPA staff and ,·epresentatives of General Motors met to discuss issues 

and questions related to the provisic·ns ofthe Tier 3 NPRM. A copy ofthe agenda and 

attendees is attached. 

B. Discussion: 

After personal introductions and some brief introductory remarks, discussions followed the 

agenda. The discussions were brief and heavily referenced GM comments on the Tier 3 

NPRM where applicable. There were three areas where more detailed discussions 

occurred. 

Harmonization with LEV III Program: ·aM emphasized the importance of alignment with 

the LEV III program to the greatest degree possible. When EPA inquired about the impact 

oftiming of the Tier 3 final rule action, GM responded that slipping a couple of months 

into 2014 was okay provided that k€ y related program elements impacting 2017 model 

year implementation were as expected. 

Test Procedure Adjustment Due to Change in Test Fuel CR-Factor): GM provided some 

initial verbal feedback on EPA's staff presentation to the Alliance of Automobile 

Manufacturers and the Association of Global Automakers on August 7, 2013. Key points 

byGM. 

(l) They want the R-factor issue res)lved as soon as possible. They proposed that EPA set 

it at 1.0 in the Tier 3 final rule and ~vise it through rule at a later date if necessary. EPA 

staff acknowledged the need for a timely but thorough action on the R-factor based on the 

best available data but rejected GM's idea on a move to set Rat I .0 now. 

(2) GM is very concerned about dual testing burdens (i.e., testing both FEDVs and EDVs 

on EO and E I X) fuel. 

(i) GM Does not want FEDVs to have to pass emission standards on EO and EIX. 

(ii) GM wants the option not to have to test FEDVs on EO for mpg 

calculation purposes. GM \ vants to be able to use EDV test results on ElX. 

(iii) GM supports litmus on ElX or EO at their choice. 

(iv) GM wants only one fue l for IUVP, preferably E IX. 

(3) GM provided some written feedback on August 15, 2013. This is attached. 
Certifying Nationwide Early Using LEV Ill Vehicles: GM strongly emphasized their 

interest in certifying 2015 model year LEV III vehicles nationwide using CA fuel for 

purposes on earning NMOG + NOx and early evaporative emission credits. They sought 

assurances that EPA would accept emission test results based on 7 RVP El 0 fuel. 

US06 PM Standard: Based on new information from California which is available to GM, 

EPA staff set forth the idea that the US06 PM standard should be 6mg/mi with a 12 mg /mi 

in-use standard in place during the phase-in (through the 2021 MY production). EPA asked 

GM for any data they have on US06 PM and to consider this idea. 

ORVR for HDGVs: EPA confirmed that the NPRM did not cover ORVR for incomplete 

HDGVs, but GM agreed that the requirements could cover all complete HDGVs 

independent of GVWR beginning in the 2018 MY. OM agreed to provide EPA 

information on sales of incomplete ~GVs above 8,500 lbs GWWR. 

HDGE Certification Gasoline: GM agreed that HDGEs using the engine dynamometer for 

emissions certification would have 10 be certified for emissions on Tier 3 certification fuel 

by the 2022 model year. 

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i! . 
A. Rulemaking Timing 

B. GM Comments 

Draft Agenda 

GM - EPA Tier 3 Meeting 

August 14, 2013 

I. Harmonization with •California's LEV III Program 

II. Test Procedure Adjustment Due to Change in Test Fuel (R-Factor) 

Ill. Four Wheel Drive (4WD) Dynamometers 

IV. 4WD Dynamometer Tt!St Procedure Adjustment 

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V. 4WD Dynamometer Filcility Impacts 

VI. 10 psi RVP Tier 3 Test ruel for Evaporative Emission Testing 

VII. Evaporative Emission Phase-in 

VIII. Evaporative Emission Testing Ethanol Adjustment Factor 

IX. In-Use Compliance Crit eria 

X. Expansion of AECD Requirements 

XI. Certifying Nationwide Early Using LEV Ill Vehicles 

XII. Preconditioning for ln .. use Testing 

XIII. Tier 3 Exhaust Emissions Certification Fuel 

XIV. Regulations Governin!J Use of Alternative Test Fuels 

XV. Tier 3 Certification FUE!I RVP and Marketplace Fuel RVP Should both be 9 

RVP during the Summ ~r VOC Control Season 

XVI. Gasoline Octane is Important for Emissions- Certification and Market 

Fuels 

XVII. Alternative Certification Fuels 

XVIII. Tier 3 Market Fuel Gasoline Sulfur Standards 

C. ARB Comments 
• 1 mg/mi Long-Term FTP PM Standard 

• 4 mg/mi US06 PM Standard 

• Certification Fuel Reciprocity 

D. Alliance/Global Comments 

a. Exclude >8500 lbs ineompletes from ORVR 

b. Other topics?