46 CFR § 153.1025 - Motor fuel antiknock compounds.
(a) No person may load or carry any other cargo in a containment system approved for motor fuel antiknock compounds containing lead alkyls except a cargo to be used solely in the manufacture of motor fuel antiknock compounds.
(b) The master shall ensure that no person enter a pumproom or void space that contains piping from a containment system approved for motor fuel antiknock compounds containing lead alkyls unless:
(1) The pumproom or void space atmosphere has been analyzed for its lead (as Pb) content and found to be less than 0.075 mg/m 3; or
(2) The person follows the procedures for entering a cargo tank described in paragraph (c) of this section.
(c) No person may enter a cargo tank endorsed for motor fuel antiknock compounds containing lead alkyls without prior specific authorization from the Commandant (CG–ENG). This authorization may be obtained by calling telephone number 202–372–1420 or e-mail hazmatstandards@uscg.mil if the person has previously obtained approval for the cargo tank entry procedure from the Commandant (CG–ENG).
(d) No person may enter a cargo tank endorsed for motor fuel antiknock compounds if he does not follow the conditions in the authorization under paragraph (c) of this section.