Alice B. Ley

Frontier Oil Corp. is an energy company, which is engaged in crude oil refining and wholesale marketing of refined petroleum products. The company operates refineries in Cheyenne, Wyoming and El Dorado, Kansas. Frontier Oil purchases crude oil to be refined and markets the refined petroleum products produced, including various grades of gasoline, diesel fuel, jet fuel, asphalt, chemicals and petroleum coke. The Cheyenne Refinery has a permitted crude oil capacity of 52,000 bpd and markets its refined products primarily in the Eastern slope of the Rocky Mountain region, which encompasses Eastern Colorado, Eastern Wyoming and Western Nebraska. It has a coking unit, which allows the refinery to process heavy crude oil for use as a feedstock. The El Dorado Refinery is in the Plains States and the Rocky Mountain region with crude oil capacity of 135,000 bpd. It markets gasoline and diesel in Denver and throughout the Plains States. Frontier Oil also owns Ethanol Management Co., a products terminal and blending facility located near Denver, Colorado. The company was founded in 1949 and is headquartered in Houston, TX.

QEP Midstream Partners LP is a limited partnership company formed to own, operate, acquire and develop midstream energy assets. The company's primary assets consist of ownership interests in four gathering systems and two FERC-regulated pipelines through which it provides natural gas and crude oil gathering and transportation services. It provides gathering, compression and transportation services to producers and users of natural gas and crude oil. The company was founded on April 19, 2013 and is headquartered in San Antonio, TX.

Arthur Andersen LLP used to provide accounting services. It was also into consulting services for clients that operate businesses throughout the United States and around the world. Arthur Andersen was founded in 1913 and was headquartered in Chicago, IL.

QEP Resources, Inc. engages in the exploration and production of oil and natural gas properties. It focuses in the Northern Region primarily in North Dakota, Wyoming and Utah, and the Southern Region primarily in Texas and Louisiana geographical regions. The company was founded in 1922 and is headquartered in Denver, CO.

Part of Marathon Petroleum Corp., QEP Midstream Partners GP LLC is a private company that provides natural gas transmission services. The company is based in Denver, CO.