May 27, 2015

MEMORANDUM

SUBJECT:	Upstream emissions modeling files for HDGHG Phase 2 NPRM

FROM:	Jarrod Brown, Chemical Engineer, ASD-OTAQ-EPA

TO:	Greenhouse Gas Emissions Standards and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles - Phase 2 - Docket EPA-HQ-OAR-2014-0827


Contents:
Upstream emissions modeling for HDGHG Phase 2 includes 6 files:
1. HDGHG2_NPRM_FuelCons_Upstream_021615.xls
2. HDGHG2_NPRM_FuelCons_UpstreamMYONLY_032415.xls
3. PreHDGHG1_FuelCons_MY_Upstream_051915.xls
4. upstream_automator_v9.py
5. upstream_automator_v9MY.py
6. upstream_emissions_rev100514.xlsx

Description:
Files 1-3 contain input volumes for overall gasoline and diesel fuel generated by the MOVES model for various alternatives considered in the NPRM. File 1 contains fuel volumes output by calendar year, file 2 contains output by model year and file 3 contains volumes for scenarios considered in the Phase 1 rulemaking for historical comparison.

Files 4-5 contain Python script automating the processing of fuel volume inputs through the upstream emissions calculator. File 4 is used specifically for calendar year analysis (and should be used in conjunction with file 1), file 5 is used specifically for model year analysis (and should be used in conjunction with file 2 & 3).

File 6 contains the upstream emissions calculator used to generate criteria and select toxics emissions for the HDGHG Phase 2 NPRM. This calculator analyzes upstream emissions for specific gasoline and diesel volumes (including biofuels) and, by running the scripts contained in files 4-5, is used once for each line of input contained in files 1-3. These results are then aggregated.
