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Table 4-13 shows the marine transportation distance assumptions.  The percentages represent the weighted average of the shipping distance that corresponds to the locations indicated in the table.  Tanker travel distance in the SoCAB is taken to be 26 nautical miles.  Several studies have considered the appropriate distance to include for marine vessel inventories (Port of Los Angeles).  The SCAQMD boundaries include a 32 nautical mile section towards Venture County and a 18 nautical mi section heading to the South.  Other studies have drawn a 88 nautical mile radius from shore or a similar shape out past San Clemente Island.  Tanker ships probably reduce their power and coast when entering port that would lead to lower emissions along the coast.  A relatively shorter (26 mi) tanker travel distance was assumed for this study while tanker emissions are not adjusted for reduced load.  Assuming a longer distance and lower emissions would yield a similar result.

Table 4-13:  Partition of Marine Transport Distancesa

Location

Vancouver

Singapore, Indonesia

Alaska

Mileage Allocation

SoCAB

26

26

26

CA

544

272

180

U.S.

430

215

23

ROW

0

7710

3110

a One way distance, nautical miles

4.2  Refinery Emissions

A variety of petroleum products are produced from crude oil.  Refineries produce gasoline, diesel, kerosene/jet fuel, LPG, residual oil, asphalt and other products.  A variety of co-feedstocks, including natural gas, electricity, hydrocarbons from other refineries, and MTBE and other oxygenates, complicates the analysis of fuel-cycle emissions.  Different crude oil feedstocks, gasoline specifications, and product mixes also complicates the picture for refineries.

Determining the emissions from the production of petroleum products involved the following approach.  The SCAQMD emissions inventory includes emissions from oil production, refining, and distribution.  These emissions are broken down by type, e.g. fugitives from valves and flanges.  Emissions from base year, 1996, is based on emission use fees from stationary sources.  These values were the basis for determining emissions, on a gram per total amount of petroleum production basis.  However, these emissions need to be allocated to the various refinery products in order to reflect the energy requirements for producing different fuels.

The output from refinery model was used to determine the energy inputs required to produce different gasoline, diesel, and other petroleum products.  Refinery combustion

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