MARKWEST OKLAHOMA GAS COMPANY, L.L.C. — Notice of Amendment

case documentOfficial PDF420111009M_NOA_09072011.pdf#

case documentOfficial PDF420111009M_NOA_09072011_text.pdf#

party submissionOfficial PDF420111009M_Operator Response to NOA_09292011.pdf#

420111009M_ Closure_06052012_text.pdf, page 1Official PDFCERTIFIED MAIL - RETURN RECEIPT REQUESTED June 5, 2012 Mr. John Mollenkopf COO/Senior Vice President Markwest Oklahoma Gas Company, LLC 1515 Arapahoe Street, Tower I, Suite 1600 Denver, CO 80202-2126 CPF 4-2011-1009M Dear Mr. Mollenkopf: Between April and June 2011, representatives of the Pipeline and Hazardous Materials Safety Administration (PHMSA) inspected Markwest Oklahoma Gas Company, LLC (Markwest) pipeline facilities and Operations and Maintenance Procedures. As a result of the inspection, Markwest was issued a Notice of Amendment on September 7, 2011. This Notice proposed amendment of your procedures to assure safe operation of your pipeline facilities. Markwest submitted its amended procedures from October 2011 through April 2012. My staff reviewed the amended procedures, and it appears that the inadequacies outlined in this Notice of Amendment have been corrected. This letter is to inform you no further action is necessary and this case is now closed. Thank you for your cooperation. Sincerely, R. M. Seeley Director, Southwest Region Pipeline and Hazardous Materials Safety Administration#

420111009M_Closure_06052012.pdf, page 1Official PDFu.s. Department of Transportation Pipeline and Hazardous Materials Safety Administration 8701 South Gessner, Suite 1110 Houston, TX 77074 CERTIFIED MAIL- RETURN RECEIPT REQUESTED June 5, 2012 Mr. John Mollenkopf COO/Senior Vice President Markwest Oklahoma Gas Company, LLC 1515 Arapahoe Street, Tower I, Suite 1600 Denver, CO 80202-2126 CPF 4-2011-1009M Dear Mr. Mollenkopf: Between April and June 2011, representatives of the Pipeline and Hazardous Materials Safety Administration (PHMSA) inspected Markwest Oklahoma Gas Company, LLC (Markwest) pipeline facilities and Operations and Maintenance Procedures. As a result of the inspection, Markwest was issued a Notice of Amendment on September 7, 2011 . This Notice proposed amendment of your procedures to assure safe operation of your pipeline facilities. Markwest submitted its amended procedures from October 2011 through April 2012. My staff reviewed the amended procedures, and it appears that the inadequacies outlined in this Notice of Amendment have been corrected. This letter is to inform you no further action is necessary and this case is now closed. Thank you for your cooperation. Sincerely, R. M. Seeley Director, Southwest Region Pipeline and Hazardous Materials Safety Administration#