; (II) the emergency response plan under section 192.615 of title 49, Code of Federal Regulations (or successor regulations); and (III) the procedural manual for operations, maintenance, and emergencies under section 192.605 of title 49, Code of Federal Regulations (or successor regulations). (ii) Updates Each operator of a distribution pipeline shall submit to the Secretary an updated plan or manual described in clause (i) by not later than 60 days after the date of the update. . (b) Monitoring Section 60105(e) of title 49, United States Code, is amended— (1) in the second sentence, by striking A State and inserting the following: (2) Cooperation A State ; (2) by striking The Secretary and inserting the following: (1) In general The Secretary ; and (3) by adding at the end the following: (3) Audit program Not later than 1 year after the date of enactment of this paragraph, the Secretary shall promulgate regulations to update the annual State Program Evaluations to— (A) ensure that a State authority has the capability to sufficiently review and evaluate the adequacy of the plans and manuals described in section 60109(e)(7)(C)(i); and (B) require that a State authority has a sufficient number of inspectors to ensure safe operations, as determined by a formula that takes into account factors including but not limited to— (i) the number of miles of cast iron pipe in the State; (ii) the number of customers in the State; (iii) population density in areas with gas distribution pipeline; (iv) the age of the gas distribution system in the State