Page 1May 27, 2026 David Chislea Manager, Gas Operations Section Michigan Public Service Commission 7109 W. Saginaw Lansing, MI 48917 Re: Withdrawal of Interpretation Letter PI-18-0010 Dear Mr. Chislea: On October 4, 2018, PHMSA responded to your request for an interpretation of the federal pipeline safety regulations in 49 CFR Part 192 regarding the inspection and testing of compressor station relief valves under section 192.73l(a). This letter is to inform you that PHMSA has withdrawn that response to further consider the matter. If we can be of further assistance, please contact Joseph Berry at (720) 601-3577. Sincerely, Cameron Satterthwaite Acting Director, Standards and Rulemaking Division, Office of Pipeline Safety#

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