EX-99.1 3 a2081074zex-99_1.txt EXHBIT 99.1 EXHIBIT 99.1 CONSENT OF INDEPENDENT CHARTERED ACCOUNTANTS We consent to the inclusion of our report dated October 19, 2001, with respect to the combined financial statements of Leland/Watford Group included in the current report of MarkWest Hydrocarbon, Inc., on Form 8-K/A dated May 24, 2002, filed with the Securities and Exchange Commission. /s/ KPMG LLP Chartered Accountants Calgary, Canada May 24, 2002 43