Section 407-421-5 - Documentation RequirementsA.Preservation of Records1. All records required by these rules shall be preserved by the LPG operator for 1 year after the LPG Operator ceases to operate the LPG system unless otherwise designated by 49 C.F.R. Part 192.2. The LPG operator shall make such records available to the Commission upon request at the LPG operator's local office.B.LPG Operator Documentation of Gas Odorization1. All LPG delivered by distribution system to customers shall be odorized by the addition of a warning agent of such character that the gases are detectable, by a distinct odor.2. The presence of odorant shall be determined by sniff-testing or other means and the results documented upon delivery to the distribution system storage containers or when LPG is loaded into the containers of delivery vehicles at a bulk facility.65- 407 C.M.R. ch. 421, § 5