Section 172.328 49 CFR Ch. I (10-1-18 Edition) (c) As an alternative to the marking required in (a) and (b) of this section, a label, tag, or sign may be displayed at each location (e.g., manhole, loading head) where exposure to hydrogen sulfide vapors may occur. The label, tag, or sign must be durable, in English, and printed legibly and of a size relative to the package with a warning statement such as - Danger, Possible Hydrogen Sulfide Inhalation Hazard - to communicate the possible risk of exposure to harmful concentrations of hydrogen sulfide gas. [76 FR 3367, Jan. 19, 2011, as amended at 80 FR 1150, Jan. 8, 2015] Section 172.328 Cargo tanks. (a) Providing and affixing identification numbers. Unless a cargo tank is already marked with the identification numbers required by this subpart, the identification numbers must be provided or affixed as follows: (1) A person who offers a hazardous material to a motor carrier for transportation in a cargo tank shall provide the motor carrier the identification numbers on placards or shall affix orange panels containing the required identification numbers, prior to or at the time the material is offered for transportation. VerDate Sep<11>2014 16:41 Oct 31, 2018 Jkt 244226 PO 00000 Frm 00410 Fmt 8010 Sfmt 8010 Q:\49\49V2.TXT PC31 ER19JA11.034 400