33 C.F.R. § 156.125
(a) Each person conducting the transfer operation shall stop the transfer operation whenever oil or hazardous material from any source is discharged:
(b) Except as permitted under paragraph (c) of this section, no person may resume the transfer operation after it has been stopped under paragraph (a) of this section, unless:
[CGD 75-124, 45 FR 7177, Jan. 31, 1980, as amended by CGD 86-034, 55 FR 36255, Sept. 4, 1990]