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**May 23 , 201**  **2 MEMORANDUM**  **TO: Air Docket**  **EP A**  **- HQ**  **- OAR** **- 2011**  **- 0542**  **SUBJECT: Supporting Documentation for**  **the Notice of Data Availability** 

**(NODA) Concerning Renewable Fuels Produced from Grain Sorghum Under the Renewable Fuel Standard Program**  This memorandum accompanies information related to EPA’s anal ys is of lifecycle greenhouse gas (GHG) emissions from ethanol produced from grain sorghum
. As explained in the preamble to the Notice of Data Availability (N O DA), o ur analy sis utilizes several data sources an d models. To facilitate public review, below is a brief description of the informational materials which accompan y this memorandum
. **1. Summary of**  **Grain Sorghum Modeling Inputs and Assumptions**  This memorandum provides information on the key inputs and as sumptions used in EPA’s lifecy cle anal ys is of grain sorghum used as a feedstock to produce ethanol . Assumptions include crop yi elds, co - products , processing emissions, and other important factors in our lifecycle anal ys is. **2 .**  **FASOM Results** A spreadsheet that contains domestic agricultural output from the FASOM model for the “grain sorghum control case” and the “grain sorghum 300MG case.” **3 .**  **FAPRI -**  **CARD Grain Sorghum Control Case Results** A spreadsheet that contains the international agricultural results from the FAPRI

- CARD model for the “grain sorghum control case.” **4 .**  **FAPRI -**  **CARD Grain Sorghum 300MG Case Results** A spreadsheet that contains the international agricultural results from the FAPRI

- CARD model for the “grain sorghum 300MG case.” **5 .**  **BSLAM Sor ghum NODA**  This Excel

- based model is used to perform EPA’s stochastic anal ys is of international land use change GHG emissions impacts induced b y grain sorghum ethanol . The results from this model are input into the results spreadsheet to calculate a 95% co nfidence range for lifecycle GHG emissions. **6 .**  **Sorghum Impact Calculations**

**– 0% Wet DG**  This spreadsheet calculates GHG emissions per unit of grain sorghum ethanol . The spreadsheet integrates results from of each stage of the renewable fuel lifecy cle (e. g., feedstock production, domestic and international agricultural emissions, fuel transport and distribution). The only piece of the lifecycle analy sis not calculated in this spreadsheet is the emissions from international land use change. The results fr om the impact calculation spreadsheet are used in2

the results spreadsheet, which compares the lifecycle GHG emissions of grain sorghum ethanol with the 2005 petroleum baseline. Results in this file assume 0% wet DG at the grain sorghum ethanol production process. **7. Sorghum Impact Calculations**

**– 92% Wet DG**  This spreadsheet calculates GHG emissions per unit of grain sorghum ethanol . The spreadsheet integrates results from of each stage of the renewable fuel lifecy cle (e.g., feedstock production, domest ic and international agricultural emissions, fuel transport and distribution). The only piece of the lifecycle analy sis not calculated in this spreadsheet is the emissions from international land use change. The results from the impact calculation spread sheet are used in the results spreadsheet, which compares the lifecycle GHG emissions of grain sorghum ethanol with the 2005 petroleum baseline. Results in this file assume 92% wet DG at the grain sorghum ethanol production process. **8. Sorghum Impact Calculations** 

**– 100% Wet DG**  This spreadsheet calculates GHG emissions per unit of grain sorghum ethanol . The spreadsheet integrates results from of each stage of the renewable fuel lifecy cle (e.g., feedstock production, domestic and international agricultural emissions, fuel transport and distribution). The only piece of the lifecycle analy sis not calculated in this spreadsheet is the emissions from international land use change. The results from the impact calculation spreadsheet are used in the results spreadsheet, which compares the lifecycle GHG emissions of grain sorghum ethanol with the 2005 petroleum baseline. Results in this file assume 100% wet DG at the grain sorghum ethanol production process. **9. Sorghum International Agriculture Energy Emi ssions**  This spreadsheet include s data about agricultural energy use in foreign countries . It is used to project lifecycle greenhouse gas (GHG) emissions produced by additional crop production in foreign countries. Specifically emissions associated with :

 E nergy

use per hect are of foreign crop production **10. Sorghum International Agriculture NPK Pesticide** This spreadsheet include s data about agricultural fertilizer inputs in foreign countries . It is used to project lifecy cle greenhouse gas (GHG) emissio ns produced b y additional crop production in foreign countries. Specifically emissions associated with :

 Fertilizer, pesticide and herbicide use per hectare of foreign crop production;  Nitrous oxide emissions per metric ton of foreign fertilizer applicati on; Upstream emissions from fertilizer production are calculated separatel y in the impact calculation spreadsheet.3

**11. Sorghum International Rice Emissions** This spreadsheet include s data about rice methane emissions in foreign countries . It is used to project lifecycle greenhouse gas (GHG) emissions produced by additional crop production in foreign countries. Specifically emissions associated with :

 Methane emissions per hectare of foreign rice production **12. Sorghum Results**

**– 0% Wet DG**  This spre adsheet integrate s results from all stages of the fuel life cy cle to calculate grain sorghum ethanol lifecy cle GH G emissions. The lifecy cle GHG reductions are calculated as percent emissions reductions compared to a 2005 petroleum baseline , in this case ga soline
. Results in this file assume 0% wet DG at the grain sorghum ethanol production process. **13. Sorghum Results**

**– 92% Wet DG**  This spreadsheet integrate s results from all stages of the fuel life cy cle to calculate grain sorghum ethanol lifecy cle GH G emissions. The lifecy cle GHG reductions are calculated as percent emissions reductions compared to a 2005 petroleum baseline , in this case gasoline
. Results in this file assume 92% wet DG at the grain sorghum ethanol production process. **14. Sorghum R esults** 

**– 100% Wet DG**  This spreadsheet integrate s results from all stages of the fuel life cy cle to calculate grain sorghum ethanol lifecy cle GH G emissions. The lifecy cle GHG reductions are calculated as percent emissions reductions compared to a 2005 petro leum baseline , in this case gasoline
. Results in this file assume 100% wet DG at the grain sorghum ethanol production process.