Barton Brookman

Patina Oil & Gas Corp. engages in the acquisition, development, exploitation and production of oil and natural gas properties within the continental United States. The company was incorporated in June 20, 2001 and is headquartered in Denver, CO.

PDC Energy, Inc. engages in the exploration and production of oil and natural gas. The firm acquires, explores, and develops properties for the production of crude oil, natural gas, and natural gas liquids. Its primary operations are located in the Wattenberg Field in Colorado and the Delaware Basin in Texas. The company was founded in 1969 and is headquartered in Denver, CO.

PDC 2005-B Limited Partnership was organized as a limited partnership, in accordance with the laws of the State of West Virginia for the purpose of engaging in the exploration and development of oil and natural gas properties. Business operations of the Partnership commenced upon closing of an offering for the sale of Partnership units. Upon funding, the Partnership entered into a Drilling and Operating Agreement with the Managing General Partner which authorizes Petroleum Development Corporation ('PDC') to conduct and manage the Partnership's business. Upon completion of the drilling phase of the Partnership's wells, all additional general partners units were converted into units of limited partner interests and thereafter became limited partners of the Partnership. In accordance with the terms of the Limited Partnership Agreement, the Managing General Partner manages all activities of the Partnership and acts as the intermediary for substantially all Partnership transactions

PDC 2005-A Limited Partnership was organized as a limited partnership, in accordance with the laws of the State of West Virginia for the purpose of engaging in the exploration and development of oil and natural gas properties. Business operations of the Partnership commenced upon closing of an offering for the sale of Partnership units. Upon funding, the Partnership entered into a Drilling and Operating Agreement ('D&O Agreement') with the Managing General Partner which authorizes Petroleum Development Corporation ('PDC') to conduct and manage the Partnership's business. Upon completion of the drilling phase of the Partnership's wells, all additional general partners units were converted into units of limited partner interests and thereafter became limited partners of the Partnership. In accordance with the terms of the Limited Partnership Agreement, the Managing General Partner manages all activities of the Partnership and acts as the intermediary for substantially all Partnership transactions.

PDC 2003-C LP explores oil and natural gas properties. It has drilled 22 wells in Wattenberg and 5 in Grand Valley fields. The company was founded on September 26, 2003 and is headquartered in Denver, CO.

Part of Chevron Corp., PDC 2004-A LP is a company that provides oil and natural gas drilling services. The company is based in Denver, CO. PDC 2004-A was acquired by PDC Energy, Inc. on December 09, 2010.

Part of Chevron Corp., PDC 2004-C LP is a company that provides oil and natural gas drilling services. The company is based in Denver, CO.