MARKWEST RANGER PIPELINE COMPANY, L.L.C. — Corrective Action Order

case documentOfficial PDFCPF2_2004_5017H_AmendCAO.pdf#

case documentOfficial PDFCPF2_2004_5017H_CAO.pdf#

case documentOfficial PDFCPF_2_2004_5017H_Amended_CAO_for_MarkWest.pdf#

220045017H_Closure Letter_10042010_text.pdf, page 1Official PDF1 CERTIFIED MAIL - RETURN RECEIPT REQUESTED October 4, 2010 Mr. John Mollenkopf Senior Vice President, Chief Operations Officer MarkWest Energy Appalachia, LLC 1515 Arapahoe St., Tower 2, Suite 700 Denver, CO 80202 CPF 2-2004-5017H Dear Mr. Mollenkopf: As a result of a pipeline failure on the MarkWest Hydrocarbon, Inc. (MarkWest) Maytown to Ranger pipeline in Floyd County, Kentucky on November 8, 2004, and pursuant to Section 60112 of Title 49, United States Code, the Pipeline and Hazardous Materials Safety Administration (PHMSA) issued a Corrective Action Order (CAO) on November 18, 2004, to MarkWest. The CAO was amended on November 19, 2004, and on March 21, 2005. The CAO required MarkWest to take certain corrective actions to protect the public and the environment. Subsequent to the issuance of the CAO and amendments MarkWest Hydrocarbon, Inc. changed its name to MarkWest Energy Appalachia, LLC. This letter is to inform you that MarkWest has complied with the terms of the CAO. No further action is necessary with regards to the CAO and this case is now closed. Please be advised that there is at least one other PHMSA case pending with regards to the above referenced pipeline failure and that this letter refers only to the CAO (re: CPF 2-2004-5017H) and not to any other PHMSA pending cases. Sincerely, Wayne T. Lemoi Director, PHMSA Southern Region Office of Pipeline Safety cc: Martin Fritz, President, EQT Midstream, 625 Liberty Av., Suite 1700, Pittsburgh, PA 15222#