Common use of Independent Registered Public Accounting Firm Clause in Contracts

Independent Registered Public Accounting Firm. Deloitte & Touche LLP, which has certified certain financial statements of the Partnership and delivered its opinion with respect to certain audited financial statements and schedules included or incorporated by reference in the Registration Statement, the most recent Preliminary Prospectus and the Prospectus (or any amendment or supplement thereto), is an independent registered public accounting firm with respect to the Partnership within the meaning of the Securities Act and the Rules and Regulations and the rules of the Public Company Accounting Oversight Board.

Independent Registered Public Accounting Firm. Deloitte & Touche LLPLLP (“Deloitte”), which has certified who audited the financial statements, and supporting schedules and historical summaries of revenues and certain financial statements of operating expenses for the Partnership and delivered its opinion with respect to certain audited financial statements and schedules properties related thereto included or incorporated or deemed to be incorporated by reference in the Registration Statement, the most recent Preliminary Prospectus Statement and the Prospectus (or any amendment or supplement thereto)and will deliver the “comfort” letters referred to in Section 8 hereof, is an independent registered public accounting firm with respect to the Partnership within the meaning of as required by the Securities Act and the Rules and Regulations and the rules of the Public Company Accounting Oversight BoardExchange Act.

Independent Registered Public Accounting Firm. Deloitte & Touche LLP, which who has certified certain audited the audited financial statements of the Partnership and delivered its opinion with respect to certain audited financial statements and schedules included contained or incorporated by reference in the Registration Statement, the most recent Preliminary Prospectus Pricing Disclosure Package and the Prospectus (or any amendment or supplement thereto)Prospectus, is an independent registered public accounting firm with respect to the Partnership and the General Partner within the meaning of the Securities Act and the Rules applicable rules and Regulations regulations thereunder adopted by the Commission and the rules of the Public Company Accounting Oversight BoardBoard (United States) (the “PCAOB”).

Independent Registered Public Accounting Firm. Deloitte & Touche LLP, which who has certified certain financial statements of audited the Partnership and delivered its opinion with respect to certain audited financial statements and schedules included contained or incorporated by reference in the Registration Statement, the most recent Preliminary Prospectus Pricing Disclosure Package and the Prospectus (or any amendment or supplement thereto)Prospectus, is an independent registered public accounting firm with respect to the Partnership and the General Partner within the meaning of the Securities Act and the Rules applicable rules and Regulations regulations thereunder adopted by the Commission and the rules of the Public Company Accounting Oversight BoardBoard (United States) (the “PCAOB”).

Independent Registered Public Accounting Firm. Deloitte & Touche LLP, which who has certified certain financial statements of the Partnership and delivered its opinion with respect to certain audited financial statements and schedules included or incorporated by reference consolidated subsidiaries (including the related notes thereto), whose reports appear in the Registration Statement, Statement and the most recent Preliminary Prospectus and the Prospectus (Prospectus, or any amendment or supplement thereto)are incorporated by reference therein, is and was during the periods covered by such financial statements an independent registered public accounting firm with respect to the Partnership within the meaning of as required by the Securities Act and the Rules and Regulations and the rules of the Public Company Accounting Oversight Board.

Independent Registered Public Accounting Firm. Deloitte & Touche LLP, which has certified certain financial statements of the Partnership and delivered its opinion with respect to certain audited financial statements and schedules included or incorporated by reference in the Registration Statement, the most recent Preliminary Prospectus and the Prospectus (or any amendment or supplement thereto), is an independent registered public accounting firm with respect to the Partnership within the meaning of the Securities Act and the Rules and Regulations and the rules of the Public Company Accounting Oversight Board.

Independent Registered Public Accounting Firm. Deloitte & Touche LLP, which who has certified certain audited the consolidated financial statements of the Partnership and delivered its opinion with respect to certain audited financial statements and schedules included contained or incorporated by reference in the Registration Statement, the most recent Preliminary Prospectus Statement and the Prospectus (or any amendment or supplement thereto)Prospectus, is an independent registered public accounting firm with respect to the Partnership and the General Partner within the meaning of the Securities Act and the Rules applicable rules and Regulations regulations thereunder adopted by the Commission and the rules of the Public Company Accounting Oversight BoardBoard (United States) (the “PCAOB”).

Independent Registered Public Accounting Firm. Deloitte & Touche LLP, which has the accounting firm that certified certain financial statements of the Partnership and delivered its opinion with respect to certain audited financial statements and supporting schedules included in or incorporated by reference in the Registration Statement, the most recent Preliminary Prospectus General Disclosure Package and the Prospectus (or any amendment or supplement thereto)Prospectus, is an independent registered public accounting firm with respect to the Partnership within the meaning of as required by the Securities Act and the Rules and Regulations and the rules of the Public Company Accounting Oversight BoardSecurities Act Regulations.

Independent Registered Public Accounting Firm. Deloitte & Touche LLP, which has certified audited certain consolidated financial statements of the Partnership Company and its consolidated subsidiary and delivered its opinion report with respect to certain the audited consolidated financial statements of the Company and schedules the related notes and schedule included or incorporated by reference in the Registration Statement, the most recent Preliminary Statutory Prospectus and the Prospectus (or any amendment or supplement thereto)Prospectus, is an independent registered public accounting firm with respect to the Partnership within Company and its consolidated subsidiary as required by the meaning of the Securities 1933 Act and the Rules and Regulations and the rules of the Public Company Accounting Oversight Board.

Independent Registered Public Accounting Firm. Deloitte & Touche LLP, which who has certified certain audited the consolidated financial statements of the Partnership and delivered its opinion with respect to certain audited financial statements and schedules included contained or incorporated by reference in the Registration Statement, the most recent Preliminary Prospectus Statement and the Prospectus (or any amendment or supplement thereto)Prospectus, is an independent registered public accounting firm with respect to the Partnership and the General Partner within the meaning of the Securities Act and the Rules applicable rules and Regulations regulations thereunder adopted by the Commission and the rules of the Public Company Accounting Oversight BoardBoard (United States).

Independent Registered Public Accounting Firm. Deloitte & Touche LLP, which has certified audited certain consolidated financial statements of the Partnership Company and its consolidated subsidiaries and delivered its opinion report with respect to certain the audited consolidated financial statements of the Company and schedules the related notes and schedule included or incorporated by reference in the Registration Statement, the most recent Preliminary Statutory Prospectus and the Prospectus (or any amendment or supplement thereto)Prospectus, is an independent registered public accounting firm with respect to the Partnership within Company and its consolidated subsidiaries as required by the meaning of the Securities 1933 Act and the Rules and Regulations and the rules of the Public Company Accounting Oversight Board.

Independent Registered Public Accounting Firm. Deloitte & Touche LLP, which who has certified certain financial statements of the Partnership and delivered its opinion with respect to certain audited financial statements consolidated subsidiaries (including the related notes thereto), whose reports appear in the Registration Statement and schedules included the Prospectus, or are incorporated by reference in the Registration Statement, the most recent Preliminary Prospectus and the Prospectus (or any amendment or supplement thereto)therein, is and was during the periods covered by such financial statements an independent registered public accounting firm with respect to the Partnership within the meaning of as required by the Securities Act and the Rules and Regulations and the rules of the Public Company Accounting Oversight Board.

Independent Registered Public Accounting Firm. Deloitte & Touche LLP, which who has certified certain financial statements of the Partnership and delivered Summit Investments and its opinion with respect to certain audited financial statements and schedules included or incorporated by reference consolidated subsidiaries (including the related notes thereto), whose reports appear in the Registration Statement, Statement and the most recent Preliminary Prospectus and the Prospectus (or any amendment or supplement thereto)Prospectus, is and was during the periods covered by such financial statements an independent registered public accounting firm with respect to each of the Partnership within the meaning of and Summit Investments as required by the Securities Act and the Rules and Regulations and the rules of the Public Company Accounting Oversight Board.

Independent Registered Public Accounting Firm. Deloitte & Touche LLP, which has certified certain financial statements of the Partnership and MarkWest Hydrocarbon and delivered its opinion with respect to certain audited financial statements and schedules included or incorporated by reference in the Registration Statement, the most recent Preliminary Prospectus and the Prospectus (or any amendment or supplement thereto), is an independent registered public accounting firm with respect to the Partnership and MarkWest Hydrocarbon within the meaning of the Securities Act and the Rules and Regulations and the rules of the Public Company Accounting Oversight Board.

Independent Registered Public Accounting Firm. Deloitte & Touche LLP, which who has certified certain financial statements of audited the Partnership and delivered its opinion with respect to certain audited financial statements and schedules included contained or incorporated by reference in the Registration Statement, the most recent Preliminary Prospectus Pricing Disclosure Package and the Prospectus (or any amendment or supplement thereto)other than the financial statements included in the year ended December 31, 2005) is an independent registered public accounting firm with respect to the Partnership and the General Partner within the meaning of the Securities Act and the Rules applicable rules and Regulations regulations thereunder adopted by the Commission and the rules of the Public Company Accounting Oversight BoardBoard (United States) (the “PCAOB”).

Independent Registered Public Accounting Firm. Deloitte & Touche LLP, which who has certified certain financial statements of audited the Partnership and delivered its opinion with respect to certain audited financial statements and schedules included contained or incorporated by reference in the Registration Statement, Statement and the most recent Preliminary Prospectus and the Prospectus (or any amendment or supplement thereto), ) is an independent registered public accounting firm with respect to the Partnership and the General Partner within the meaning of the Securities Act and the Rules applicable rules and Regulations regulations thereunder adopted by the Commission and the rules of the Public Company Accounting Oversight BoardBoard (United States) (the “PCAOB”).

Independent Registered Public Accounting Firm. Deloitte & Touche LLP, which who has certified certain financial statements of or shall certify the Partnership and delivered its opinion with respect to certain audited financial statements and schedules included contained or incorporated by reference in the Registration Statement, Statement and the most recent Preliminary Prospectus and the Prospectus (or any amendment or supplement thereto), ) is an independent registered public accounting firm with respect to the Partnership and the General Partner within the meaning of the Securities Act and the Rules applicable rules and Regulations regulations thereunder adopted by the Commission and the rules of the Public Company Accounting Oversight BoardBoard (United States) (the “PCAOB”).

Independent Registered Public Accounting Firm. Deloitte & Touche LLP, which has certified certain financial statements of the Partnership and delivered its opinion an independent registered public accounting firm with respect to certain the Partnership, who has audited the financial statements for the year ended December 31, 2010 (including the related notes thereto and schedules included or incorporated by reference in supporting schedules) filed as part of the Registration Statement, the most recent Preliminary Prospectus Time of Sale Information and the Prospectus (or any amendment or supplement thereto), is an are independent registered public accounting firm with respect to accountants as required by the Partnership within the meaning of the Securities Act and Act, the Rules and Regulations and the rules of the Public Company Accounting Oversight Board.

Independent Registered Public Accounting Firm. Deloitte & Touche LLP, which who has certified certain financial statements of the Partnership and delivered its opinion with respect to certain audited financial statements and schedules included or incorporated by reference consolidated subsidiaries (including the related notes thereto), whose reports appear in the Registration Statement, the most recent Preliminary Prospectus Prospectus, the Pricing Disclosure Package and the Prospectus (Prospectus, or any amendment or supplement thereto)are incorporated by reference therein, is and was during the periods covered by such financial statements an independent registered public accounting firm with respect to the Partnership within the meaning of as required by the Securities Act and the Rules and Regulations and the rules of the Public Company Accounting Oversight Board.