NuVista has developed position descriptions for the Chief Executive Officer, the Chair of the Board, the Lead Director and the Committee Chairs.

Chief Executive Officer
The Chief Executive Officer is responsible for the day-to-day operations of NuVista in accordance with the strategies and objectives approved by the Board, which are designed to maximize shareholder value, taking into account available opportunities and the risks of the business. The Chief Executive Officer is responsible for implementing the business plan, which is reviewed and approved by the Board. The Chief Executive Officer's position description also sets out specific responsibilities with respect to personal ethics and integrity, leadership and organizational planning, management development and succession planning, board relations and communication and stakeholder relations.

Chair of the Board
The Chair of the Board is responsible for managing the affairs of the Board, ensuring the Board is organized properly, functions effectively and meets its obligations and responsibilities, including those matters set forth in the mandate of the Board.

Lead Director
To provide leadership for the independent Board members, the Board has established a Lead Director position. The Lead Director's primary role is to act as liaison between management and the independent directors to ensure the Board is organized properly, functions effectively and meets its obligations and responsibilities, including those matters set forth in the mandate of the Board. The Lead Director, in the absence of the Chair or where the Chair has excused himself due to a potential conflict, presides at meetings of the Board. The Lead Director also chairs the "in camera" portions of Board meetings held without management being present and “in camera” meetings of the independent directors that are held in conjunction with each regularly scheduled meeting of the Board.

Committee Chair
The Board of NuVista has established four committees: an Audit Committee, a Compensation Committee, a Reserves Committee, and a Governance and Nominating Committee. The Chair of each Committee, who also is an independent director, is responsible for managing the affairs of the Committee, ensuring the Committee is organized properly, functions effectively and meets its obligations and responsibilities, including those matters set forth in the mandate of the Committee.

March 2008

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POSITION DESCRIPTIONS

Chief Executive Officer
(March 6, 2008)

Chair of the Board
(March 6, 2008)

Lead Director of the Board
(March 6, 2008)

Audit Committee Chair
(March 6, 2008)

Compensation Committee Chair
(March 6, 2008)

Reserves Committee Chair
(March 6, 2008)

Governance and Nominating Committee Chair
(March 6, 2008)