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MEMORANDUM

TO: Air Docket EPA

- HQ

- OAR

- 2013

- 0178

SUBJECT: Supporting Documentation for the Determination Concerning

Renewable Fuels Produced from Barley under the Renewable Fuel Standard Program

This memorandum accompanies information related to EPA’s analysis of lifecycle greenhouse gas (GHG) emissions from ethanol produced from barley

. As explained in the preamble of this determination, o ur analysis utilizes several da ta sources and models. To facilitate public review, below is a brief description of the informational materials which accompany this memorandum

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1. Summary of Barley Modeling Inputs and Assumptions for the Determination Concerning Renewable Fuels Produced from Barley u nder the Renewable Fuel Standard Program This memorandum provides information on the key inputs and assumptions used in EPA’s lifecycle analysis of barley used as a feedstock to produce ethanol . Assumptions include crop yields, co

- products

, processing emissions, and other im portant factors in our lifecycle analysis.

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. FASOM Results A spreadsheet that contains domestic agricultural output from the FASOM model for the

“ control case ” and the “ barley case.”

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. FAPRI

- CARD Control Case Results A spreadsheet that contains the international agricultural results from the FAP RI

- CARD model

for the “control case.”

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. FAPRI

- CARD Barley Case Results A spreadsheet that contains the international agricultural results from the FAPRI

- CARD model

for the “ barley case.”

5. Barley LCA Results This spreadsheet integrate s results from a ll stages of the fuel life cycle to calculate barley ethanol lifecycle GH G emissions. The lifecycle GHG reductions are calculated as percent emissions reductions compared to a 2005 petroleum baseline , in this case gasoline

. This file include s results for all barley ethanol pathways that we are proposing to approve in this NODA.

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. BSLAM Barley Determination

This Excel

- based model is used to perform EPA’s stochastic analysis of international land use change GHG emissions impacts induced by barley ethanol

. The results from this model are input into the results spreadsheet to calculate a 95% confidence range for lifecycle GHG emissions.

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. Barley LCA Impact Calculations This spreadsheet calculates GHG emissions per unit of barley ethanol . The spreadsheet integrates results from of each stage of the renewable fuel lifecycle (e.g., feedstock production,2

domestic and international agricultural emissions, fuel transport and distribution). The only piece of the lifecycle analysis not calculated in this spread sheet 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 barley ethanol with the 2005 petroleum baseline. This file i ncludes results for all barley ethanol pathways that we are proposing to approve in this NODA.

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. Barley International Agriculture Energy Emissions

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

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. Barley International Agriculture NPK Pesticide

This sprea dsheet include s data about agricultural fertilizer inputs 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 :

Fertilize r, pesticide and herbicide use per hectare of foreign crop production; Nitrous oxide emissions per metric ton of foreign fertilizer application;

Upstream emissions from fertilizer production are calculated separately in the impact calculation spreadsheet.

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. Barley 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. Speci fically emissions associated with :

Methane emissions per hectare of foreign rice production

11. Potential Regulatory Text for Barley Ethanol Pathway Determination This document provides example regulatory text , illustrating how EPA’s proposed barley eth anol pathways and their accompanying registration, recordkeeping, and reporting requirements might look if put into practice. This text is not being specifically proposed. Rather, it provides the

reader with a n aide to better understand how the proposed pathways could be structured within the RFS regulations.