Section 98.30-19 - Supervision by person in charge(a) No person may connect, top off, disconnect, or engage in any other critical product transfer operation unless the person in charge designated in § 98.30-17 , personally supervises the operation.(b) No person may start the flow of a product to or from a portable tank or IBC unless instructed to do so by the person in charge.(c) No person may transfer a product to or from a portable tank or IBC unless the person in charge is in the immediate vicinity of the transfer operation and immediately available to the person transferring the product.CGD 73-172, 39 FR 22954, June 25, 1974, as amended by USCG-2011-0088, 78 FR 54787 , Sept. 6, 2013