Ultramar Diamond Shamrock

As of December 31, 2001, Ultramar Diamond Shamrock Corporation was acquired by Valero Energy Corporation. Ultramar Diamond Shamrock Corporation (UDS) operated as an independent refiner and retailer of refined products and convenience store merchandise in the central, southwest, and northeast regions of the United States, as well as eastern Canada. In the northeast region of the United States and in eastern Canada, UDS sells home heating oil to approximately 250,000 households.