Unless waived under §153.483 or §153.491, each Category C NLS cargo tank on ships built before July 1, 1986 must meet the following:

(a) Unless the tank meets the interim standard provided by paragraph (b) of this section, the tank must have a stripping quantity determined under 153.1604 that is less than 0.95 m3.

(b) Before October 3, 1994, the tank may have a total NLS residue determined under §153.1608 that is less than 3.0 m3 or 1/1000th of the tank's capacity.