6.6 Gasoline Truck Loading
6.6.1 Emissions
Introduction
Fuels are delivered by tank trucks from the fuel terminals to service stations, commercial accounts and local bulk storage plants. Loading losses are primary source of evaporative emission from truck loading. Loading losses occur as organic vapors in the empty tank are displaced to atmosphere by the liquid being loaded into the tanks. These categories account for the organic emissions associate with transfer of gasoline to trucks from racks at terminals and bulk plants.
Methodologies
These categories contain point source emissions. Emissions were determined by the District’s Data Bank System. These data originated with information supplied by the plants and stored in the District’s Data Bank System. Throughput is updated upon permit renewal. The organic liquid storage emission factors were obtained from AP-42.
Monthly Variation
The Data Bank contains percentage of throughput data for each seasonal quarter: (December - February, March - May, June - August, September - October).
County Distribution
Emissions distributed into the nine counties were based on the actual locations of the plants in the Bay Area.
| category | ALA | CC | MAR | NAP | SF | SM | SNC | SOL | SON |
|---|---|---|---|---|---|---|---|---|---|
| #64 Bulk Plants | – | – | – | – | – | – | – | – | – |
| #898 Bulk Terminals | – | – | – | – | – | – | – | – | – |
6.6.2 Trends
History
Historical emission data was based on past years Bay Area gasoline consumption. The estimated gasoline consumption was obtained from California Taxable Gasoline Sales, Board of Equalization.
Growth
| category | backcast | forecast | profile |
|---|---|---|---|
| #64 Bulk Plants | No | Yes | #151 Gas Consumption In Mmgal/Yr |
| #898 Bulk Terminals | No | Yes | #589 Revised Bulk Plant Tputs |
Projections are based on future gasoline consumption in the Bay Area.
Control
Truck loading emissions were reduced due to the effect of Rule 8-39, adopted on October 7, 1987 and Rule 8-33, adopted on November 30, 1983. Rule 8-33 requires to reduce emissions of precursor organic compounds from gasoline transfer operations at gasoline bulk terminals and delivery vehicles (Cat # 898). Rule 8-39 requires to reduce emissions of precursor organic compounds from gasoline transfer operations at gasoline bulk plants and delivery vehicles (Cat # 64).
On April 15, 2009, the District amended Rule 8-33 (Gasoline Bulk Terminals) and Rule 8-39 (Gasoline Bulk Plants). The amendments include a requirement to minimize the release of organic compounds during maintenance and repair operations, and a reduction in the allowable backpressure in new vapor recovery system piping.
By: Michael Nguyen Date: January, 2014 Base Year 2011