TALLGRASS PONY EXPRESS PIPELINE, LLC — Notice of Probable Violation

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Pipeline and Hazardous Materials Safety AdministrationOfficial agency material

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party submissionOfficial PDF32025008NOPV_Operator Response to Notice and Request for Hearing and Request an Informal Settlement Meeting and Request Case File_07162025_(23-264835).pdf#

case documentOfficial PDF32025008NOPV_PCP PCO_06162025_(23-264835).pdf#

case documentOfficial PDF32025008NOPV_PCP PCO_06162025_(23-264835)_text.pdf#

32025008NOPV_Region Withdrawal of Notice Letter_11262025_(23-264835)_text.pdf, page 1Official PDFU.S. Department of Transportation Pipeline and Hazardous Materials Safety Administration 901 Locust Street, Suite 480 Kansas City, MO 64106 WITHDRAWAL OF NOTICE LETTER VIA ELECTRONIC MAIL TO: CEO@tallgrass.com; crystal.heter@tallgrassenergylp.com; danielle.stephens@tallgrass.com November 26, 2025 Matt Sheehy President & CEO Tallgrass Energy Partners, LP 370 Van Gordon Street Lakewood, CO 80228 CPF 3-2025-008-NOPV Dear Mr. Sheehy: On June 16, 2025, PHMSA issued a Notice of Probable Violation letter for the case number referenced above. This Notice cited Tallgrass Energy Partners, LP, for violations of Part 195. Two of the Items (Items 3 and 4) were brought as warnings. Tallgrass responded to the Notice on July 16, 2025. Following review of the case, PHMSA hereby withdraws the Notice. This letter is to inform you of the withdrawal and that the case is now closed. Sincerely, David Barrett Acting Director, Central Region, Office of Pipeline Safety Pipeline and Hazardous Materials Safety Administration cc: Ryan McClure, Attorney Advisor, PHMSA, ryan.mcclure@dot.gov Crystal Heter, Chief Operating Officer, crystal.heter@tallgrassenergylp.com Danielle Stephens, Director, PHMSA Compliance, danielle.stephens@tallgrass.com#

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