The west end of the site had once been the city landfill, which at one time contained (unmodified, unstripped) Japanese Zeros brought over from after World War II.

Astra sold USOR to TrailStone in 2014,[2] which is funded by Riverstone Holdings, a private equity firm founded by key Goldman Sachs entrepreneurs.

[3] The refinery, with current crude capacity of 39,000 barrels per day (6,200 m3/d) is located on 136 acres (55 ha) in the deep-water Port of Tacoma, Washington.

The refinery has direct rail access and is close to both a major interstate highway system and the Seattle-Tacoma International Airport.

[4] These products are made by use of a few different primary process units, including vacuum distillation, catalytic reforming, isomerization, and diesel hydrotreating.