Rule 425. In addition to the requirements set forth in 49 C.F.R.§192.705, which is adopted by reference in R 460.20606, an operator of pipeline facilities used in the transportation of sour gas shall, at intervals of not more than 6 weeks, but not less than 12 times each calendar year, patrol all pipelines that are used in the transportation of sour gas.
Mich. Admin. Code R. 460.20425