Except as allowed in Sec. 157.158, the master of a foreign tank vessel having a COW system under Sec. 157.10(e), Sec. 157.10a(a)(2), or Sec. 157.10c(b)(2) that has the Crude Oil Washing Operations and Equipment Manual approved under Sec. 157.112 and is operating in the navigable waters of the United States or transferring cargo at a port or place subject to the jurisdiction of the United States and the master of a U.S. tank vessel having a COW system under Sec. 157.10(e), Sec. 157.10a(a)(2), or Sec. 157.10c(b)(2) shall ensure that during each COW operation--
(a) The procedures listed in the Crude Oil Washing Operations and Equipment Manual are followed; and
(b) The characteristics recorded in the Crude Oil Washing Operations and Equipment Manual under Sec. 157.150(b) are met. [CGD 77-058b, 45 FR 43709, June 30, 1980, as amended by CGD 82-28, 50 FR 11628, Mar. 22, 1985]