Distinctive Odor Required. The odorant level throughout the entire company distribution system shall be sufficient so that gas is detectable at 1/10 of the lower explosive limit. Tests. A system to monitor the odorant level within the distribution system shall be installed and maintained to insure the requirements of §A of this regulation. Odorant Injection. On-site odorant injection or other recognized protection means shall be provided to prevent odor fading wherever necessary when new steel mains are installed, to insure the requirements of §A of this regulation.