MarkWest Hydrocarbon, Inc. Announces Release Date for Second Quarter 2007 Financial Results

  
    
  
  
    
      MarkWest Hydrocarbon, Inc. (AMEX: MWP) will announce second quarter 2007 
      financial results and file its Quarterly Report on Form 10-Q with the 
      Securities and Exchange Commission after market close on Wednesday, 
      August 8, 2007.
    
    
      You are invited to join a conference call and webcast on Tuesday, August 
      14, 2007, at 5:00 p.m. Eastern Time with Frank Semple, President and 
      Chief Executive Officer; Nancy Buese, Senior Vice President and Chief 
      Financial Officer; Randy Nickerson, Senior Vice President and Chief 
      Commercial Officer; and Andrew Schroeder, Vice President Finance and 
      Treasurer.
    
    
      The conference call can be accessed by dialing 888-324-4145 (passcode “MarkWest”) 
      or via webcast, the link for which is available in the “Investor 
      Relations” section of the MarkWest website at www.markwest.com.
    
    
      A replay of the conference call will be available through Tuesday, 
      August 21, 2007, by dialing 866-393-0878 (no passcode required). 
      Alternatively, the conference call will be archived on the website above.
    
    
      MarkWest Hydrocarbon, Inc. (AMEX: MWP) controls and operates MarkWest 
      Energy Partners, L.P. (NYSE: MWE), a publicly traded limited partnership 
      engaged in the gathering, processing and transmission of natural gas; 
      the transportation, fractionation and storage of natural gas liquids; 
      and the gathering and transportation of crude oil. We also market 
      natural gas and NGLs.
    
    
      This press release includes “forward-looking 
      statements” within the meaning of Section 27A 
      of the Securities Act of 1933, as amended, and Section 21E of the 
      Securities Exchange Act of 1934, as amended. All statements other than 
      statements of historical facts included or incorporated herein may 
      constitute forward-looking statements. Although we believe that the 
      expectations reflected in the forward-looking statements are reasonable, 
      we can give no assurance that such expectations will prove to be 
      correct. The forward-looking statements involve risks and uncertainties 
      that affect our operations, financial performance and other factors as 
      discussed in our filings with the Securities and Exchange Commission. 
      Among the factors that could cause results to differ materially are 
      those risks discussed in our Annual Report on Form 10-K for the year 
      ended December 31, 2006, and our Quarterly Reports on Form 10-Q, as 
      filed with the SEC.