REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the Management Committee of
Discovery Producer Services LLC
We have audited the accompanying consolidated balance sheets of Discovery Producer Services LLC as of
December 31, 2011 and 2010, and the related consolidated statements of income, members’ capital, and cash
flows for each of the three years in the period ended December 31, 2011. These financial statements are the
responsibility of the Company’s management. Our responsibility is to express an opinion on these financial
statements based on our audits.
We conducted our audits in accordance with the standards of the Public Company Accounting Oversight
Board (United States). Those standards require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are free of material misstatement. We were not engaged to
perform an audit of the Company’s internal control over financial reporting. Our audits included consideration
of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the
circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal
control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining,
on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the
accounting principles used and significant estimates made by management, and evaluating the overall financial
statement presentation. We believe that our audits provide a reasonable basis for our opinion.
In our opinion, the financial statements referred to above present fairly, in all material respects, the
consolidated financial position of Discovery Producer Services LLC at December 31, 2011 and 2010, and the
consolidated results of its operations and its cash flows for each of the three years in the period ended
December 31, 2011, in conformity with U.S. generally accepted accounting principles.
/s/ Ernst & Young LLP
Tulsa, Oklahoma
February 29, 2012
222