Terms of Use

Welcome to the Web site of MarkWest Hydrocarbon, Inc. and MarkWest Energy Partners, L.P. (collectively with their subsidiaries "MarkWest", "we", "our", "us"). Please review the following terms and conditions that govern your use of our Web site. Please note that your use of our Web site constitutes your agreement to follow and be bound by the privacy policy, legal notices and terms of use (collectively, the "Terms").

Forward-Looking Statements

The MarkWest Web site contains "forward-looking statements" within the meaning of the Securities Act of 1933 and the Securities Exchange Act of 1934, each as amended, regarding MarkWest. All statements other than statements of historical facts included or incorporated on this Web site may constitute forward looking statements. Although we believe that the expectations reflected in the forward-looking statements are based on reasonable assumptions and beliefs, there can be no assurance given that the expectations will prove to be correct. The forward looking statements involve risks and uncertainties that affect our operations, financial performance and other factors discussed in our filings with the Securities and Exchange Commission. Factors that could cause MarkWest's actual results to differ materially from our expectations are included in our periodic reports that we file with the SEC, including the Annual Reports on Form 10-K and Quarterly reports on Form 10-Q. You are also urged to carefully review and consider the cautionary statements and other disclosures made in those filings, specifically those under the heading "Risk Factors." We do not undertake any duty to update any forward looking statement except as required by law.

How You May Use the Content on Our Web site

None of the information provided on our Web site constitutes investment advice or an invitation to invest in MarkWest. The information contained on our Web site is provided only for your general knowledge and you should not make any investment decision based on the information on our site.

Links to Other Web Sites and References to Other Companies

References that we make to names, marks, products or services of third parties or hypertext links to third-party Web sites or information do not constitute or imply our endorsement, sponsorship or recommendation of the third party. Links to third-party Web sites not maintained by MarkWest are provided solely for your convenience. We do not monitor or control the content of any Web sites linked to or from our Web site, and therefore we are not responsible for the content of any Web sites linked to our site or the terms of use or privacy practices employed by those other sites. Content and Liability Disclaimer Content on MarkWest's Web site may include technical inaccuracies or typographical errors, and we are not responsible for any reliance you may place on the content. MarkWest may make changes to the content and the products, services and programs described in the content at any time without notice.

Disclaimer of Warranties and Liabilities

Although MarkWest has made reasonable efforts to provide accurate and timely information, there may be inadvertent technical or factual inaccuracies, typographical errors, and information and content may not be up-to-date. MarkWest does not warrant the accuracy or completeness of the information, text, graphics, links or other items contained on or accessed through MarkWest's Web site, and MarkWest expressly disclaims liability for errors or omissions in these materials, and use or interpretation by others of any information presented here or contained on any linked sites, or on any other site accessed by or through MarkWest's Web site, or any site from which any person may have accessed MarkWest's Web site. MarkWest reserves the right to make changes and corrections at any time, without notice.

THE MARKWEST WEB SITE AND ALL CONTENT ARE PROVIDED "AS IS," AND ALL REPRESENTATIONS AND WARRANTIES, EXPRESS OR IMPLIED, RELATING TO THE WEB SITE OR THE MATERIALS AND CONTENT ARE DISCLAIMED (UNLESS SUCH WARRANTIES ARE INCAPABLE OF EXCLUSION UNDER APPLICABLE LAW), AND MARKWEST DISCLAIMS ALL RELATED REPRESENTATIONS, COVENANTS, OR OTHER ASSURANCES, IF ANY, AS TO THE WEB SITE, MATERIALS AND CONTENT, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY OF MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE, IMPLIED OR EXPRESS OR WARRANTY OF TITLE, OR OF PATENT, TRADEMARK OR COPYRIGHT NON-INFRINGEMENT, OR ANY WARRANTIES ARISING FROM COURSE OF DEALING OR USAGE OF TRADE, AS WELL AS ANY WARRANTY OF QUALITY, FUNCTIONALITY, CONDITION, ACCURACY, CURRENCY, COMPLETENESS, RELIABILITY, OPERABILITY, USE PERFORMANCE OR THAT ANY INFORMATION OR MATERIAL ACCESSIBLE THROUGH MARKWEST'S WEB SITE IS FREE, OF VIRUSES, CANCELBOTS, WORMS, LOGIC BOMBS, TROJAN HORSES OR OTHER HARMFUL CONTENTS OR COMPONENTS. YOU WARRANT THAT YOU UNDERSTAND AND ACKNOWLEDGE BY YOUR USE OF THE WEB SITE THAT ALL MATERIALS AND INFORMATION CONTAINED IN THE WEB SITE ARE PROVIDED WITH NO WARRANTY, REPRESENTATION, COVENANT OR OTHER ASSURANCE AS TO THEIR ACCURACY OR COMPLETENESS. YOU TAKE ALL MATERIALS AND INFORMATION ON AN "AS-IS" AND "AS AVAILABLE BASIS," MARKWEST MAKES NO COMMITMENT TO UPDATE THE INFORMATION CONTAINED IN THIS WEB SITE. YOU ASSUME ALL RESPONSIBILITY AND RISK OF LOSS RESULTING FROM THE USE OF OUR WEB SITE. IN NO EVENT SHALL MARKWEST OR ITS AFFILIATES BE LIABLE FOR ANY DAMAGES WHATSOEVER, IN CONTRACT, TORT OR OTHERWISE, INCLUDING SPECIAL, INDIRECT, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, EVEN IF MARKWEST HAS BEEN ADVISED OF THE POSSIBILITY OF THOSE DAMAGES OR SUCH DAMAGES ARE FORESEEABLE.

Trademarks and Copyright

Unless otherwise noted, all text, images, graphics, photographs, video clips, designs, icons, sounds, information, data and other materials (the "content") on MarkWest's Web site are copyrights, trademarks, service marks or other intellectual property or propriety rights owned or licensed by MarkWest or its affiliates. In particular, the mark and name "MarkWest" is protected by trademark laws and is the exclusive property of MarkWest. You may use the content only for limited, internal, noncommercial, informational purposes. You may print out a single copy of the content solely for those purposes, if the copy bears all copyright, trademark, service mark and other intellectual property and proprietary notices displayed on the Web page. You may not distribute, publish, transmit, modify, create derivative works from, or in any way exploit, any of the content, in whole or in part, for any purpose. Except as authorized in this paragraph, you are not being granted a license under any copyright, trademark, service mark, patent or other intellectual property or proprietary right in the content. Under no circumstances will you obtain any rights in the products, services, processes or technology described in the content. All those rights are retained by MarkWest, its affiliates and any third party owners of those rights.

The MarkWest mark is a trademark of MarkWest. All rights reserved.

Modification

MarkWest may supplement these Terms at any time. You may want to visit this Web page periodically to determine the current Terms to which you are bound. For more information e-mail us at webmaster@markwest.com.

Applicable Law

These Terms shall be governed by the laws of the State of Colorado, excluding its conflicts of law principles.