Joseph E. Casabona

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.

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.

Rockies Region Private LP engages in the exploration and development of oil and natural gas properties in Colorado. The company was founded on December 6, 2005 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 2002-C LP engages in the exploration and development of crude oil and natural gas properties. It owns an undivided working interest in wells located in Colorado. The company was founded in 2002 and is headquartered in Denver, CO.

Rockies Region Private LP engages in the exploration and development of oil and natural gas properties in Colorado. The company was founded on December 6, 2005 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 2002-B LP produces and sells crude oil, natural gas and natural gas liquids. It owns an undivided working interest in wells located in Colorado. The firm is managed by its managing general partner PDC Energy, Inc. The company was founded in 2002 and is headquartered in Denver, CO.

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.

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.

Rockies Region Private LP engages in the exploration and development of oil and natural gas properties in Colorado. The company was founded on December 6, 2005 and is headquartered in Denver, CO.

PDC 2002-C LP engages in the exploration and development of crude oil and natural gas properties. It owns an undivided working interest in wells located in Colorado. The company was founded in 2002 and is headquartered in Denver, CO.

PDC 2002-B LP produces and sells crude oil, natural gas and natural gas liquids. It owns an undivided working interest in wells located in Colorado. The firm is managed by its managing general partner PDC Energy, Inc. The company was founded in 2002 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.

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.

Rockies Region Private LP engages in the exploration and development of oil and natural gas properties in Colorado. The company was founded on December 6, 2005 and is headquartered in Denver, CO.

PDC 2002-B LP produces and sells crude oil, natural gas and natural gas liquids. It owns an undivided working interest in wells located in Colorado. The firm is managed by its managing general partner PDC Energy, Inc. The company was founded in 2002 and is headquartered in Denver, CO.

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.

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.