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technology mix feedstocks, emission control assumptions, and transportation distances.

3.2  Information Organization

Identifying emissions by spatial location complicates the analysis of fuel-cycle emissions considerably, since fuel and feedstock transportation distributes emissions in several of the geographic locations considered in the study.  Therefore, the information for this project is organized into a database that calculates spatial emissions and combines these results with vehicle fuel economy to represent fuel-cycle emissions on a g/mi basis.  The information is in three databases that include the following information:

Production and distribution emission rates

Emission weighting and spatial distribution

Vehicle fuel economy

Assumptions for emission scenarios, geographic distribution, production and distribution for the fuel/feedstock combinations, and production and distribution technology mixes are discussed below.  Further information on the specific mix of technologies and energy use parameters is provided in Section 4.  These databases are included in Volume 2.  Since marginal emissions in the SoCAB represent a limited set of emissions sources, all of these sources are presented in Section 6.

3.2.1  Fuel Production Phases

These steps are categorized into eight production and distribution phases shown in Table 3-2.  These phases are grouped into the categories extraction, production, marketing, and distribution, which are later used for presenting the combined emissions in Section 6.

Table 3-2:  Fuel-Cycle Emissions Were Categorized into Eight Production and Distribution Phases

Phase No.

Description

Extraction

1.

Feedstock extraction

2.

Feedstock transportation

Production

3.

Fuel processing/refining

Marketing

4.

Fuel storage at processing site

5.

Transport to bulk storage

6.

Bulk storage

7.

Transport to local distribution station

Distribution

8.

Local station distribution

17

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