Markwest Hydrocarbon (MWP) Inactive 10-Q2003 Q2 Quarterly report

Filed: 14 Aug 03, 12:00am

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New words: accredited, accumulated, agent, alerting, applied, assigned, audit, audited, Auditing, auditor, behalf, billed, billing, Boldman, bolster, Certification, Certifying, classification, Cobb, combat, communicate, communicated, constituted, counter, curtailed, decided, deficiency, degree, design, designed, detected, dictated, diligence, disaggregate, disclose, disclosed, discovered, discretion, dividend, Donald, downtime, duly, electrical, ensure, entry, ERCOT, error, floor, fraud, goodwill, grid, grossed, guidance, Heppermann, herewith, impairment, implementing, instance, intangible, interpretation, intrastate, investigation, jointly, leasehold, left, legal, likelihood, line, Lordstown, Lubbock, Lynchburg, manner, Matrex, matter, midyear, mineral, Mirant, misreported, month, notified, Notwithstanding, omission, outcome, oversight, Participation, payment, personnel, placement, policy, portfolio, President, pretax, previously, private, properly, proscribe, qualify, rata, receipt, recommended, relevant, remitted, rental, reserve, revision, routinely, Rule, saltwater, SAS, SEC, Secretary, setting, settlement, submit, summarized, thereunto, undersigned, understand, undeveloped, undivided, unproved, Vice, workover, written, XTO

Removed: amendment, borrowing, combined, competing, comply, developmental, entitled, environmental, funded, governmental, Henry, Hub, inherent, maximize, Mountain, negotiate, output, plant, proven, pursuing, raw, recent, Rocky, significantly, substantially, winter

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Exhibit 32.1

CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of MarkWest Hydrocarbon, Inc. (the “Company”), on Form 10-Q for the period ending June 30, 2003 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, John M. Fox, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934.

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ John M. Fox

John M. Fox
President and Chief Executive Officer
August 14, 2003

A SIGNED ORIGINAL OF THIS WRITTEN STATEMENT REQUIRED BY SECTION 906 HAS BEEN PROVIDED TO MARKWEST HYDROCARBON, INC. AND WILL BE RETAINED BY MARKWEST HYDROCARBON, INC. AND FURNISHED TO THE SECURITIES AND EXCHANGE COMMISSION OR ITS STAFF UPON REQUEST.

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