ONEOK ROCKIES MIDSTREAM, LLC — Warning Letter

520145016W_warning letter_11132014_text.pdf, page 1Official PDFWARNING LETTER CERTIFIED MAIL - RETURN RECEIPT REQUESTED November 13, 2014 Mr. Wes Christensen Senior Vice President, Operations ONEOK Rockies Midstream, LLC. 100 West Fifth Street Tulsa, OK 74103 CPF 5-2014-5016W Dear Mr. Christensen: On July 7, 2014 through July 11, 2014, a representative of the Pipeline and Hazardous Materials Safety Administration (PHMSA) pursuant to Chapter 601 of 49 United States Code inspected your OneOK Rockies Midstream, LLC pipeline facilities in Sidney, Montana. Specifically, our representative inspected the Riverview, Grasslands, and Stateline pipeline assets. As a result of the inspection, it appears that you have committed a probable violation of the Pipeline Safety Regulations, Title 49, Code of Federal Regulations. The item inspected and the probable violation is: 1. §195.404 Maps and Records. (c) Each operator shall maintain the following records for the periods specified; (1) The date, location, and description of each repair made to pipe shall be maintained for the useful life of the pipe. (2) The date, location, and description of each repair made to parts of the pipeline other than pipe shall be maintained for at least 1 year.#

520145016W_warning letter_11132014_text.pdf, page 2(3) A record of each inspection and test required by this subpart shall be maintained for at least 2 years or until the next inspection or test is performed, whichever is longer. The mid-year inspection record for the only over pressure safety device on the pipeline system was not available for review at the time of the inspection. The missing inspection record was for the calendar year 2013. OneOK switched to a different software system to generate work orders and contends that this one inspection was not recorded. Regardless of the maintenance record- keeping system used, OneOK must ensure that over pressure protection devices are inspected at the required intervals and records of the inspection are maintained. Under 49 United States Code, § 60122, you are subject to a civil penalty not to exceed $200,000 per violation per day the violation persists up to a maximum of $2,000,000 for a related series of violations. For violations occurring prior to January 4, 2012, the maximum penalty may not exceed $100,000 per violation per day, with a maximum penalty not to exceed $1,000,000 for a related series of violations. We have reviewed the circumstances and supporting documents involved in this case, and have decided not to conduct additional enforcement action or penalty assessment proceedings at this time. We advise you to correct the item(s) identified in this letter. Failure to do so will result in OneOK being subject to additional enforcement action. No reply to this letter is required. If you choose to reply, in your correspondence please refer to CPF 5-2014-5016W. Be advised that all material you submit in response to this enforcement action is subject to being made publicly available. If you believe that any portion of your responsive material qualifies for confidential treatment under 5 U.S.C. 552(b), along with the complete original document you must provide a second copy of the document with the portions you believe qualify for confidential treatment redacted and an explanation of why you believe the redacted information qualifies for confidential treatment under 5 U.S.C. 552(b). Sincerely, Chris Hoidal Director, Western Region Pipeline and Hazardous Materials Safety Administration cc: PHP-60 Compliance Registry PHP-500 J. Haddow (#146044) 2#