Regulations for the Prevention of Pollution from Ships and for Dangerous Chemicals

87 (1) Ballast water introduced into a cargo tank that has been washed to such an extent that the ballast water contains less than 1 ppm of the noxious liquid substance previously carried in the NLS ship may be discharged into the sea without regard to the discharge rate, ship speed and discharge outlet location, provided that the discharge is made at a distance of at least 12 nautical miles from the nearest land and into waters whose depth is at least 25 m.

(2) In the case of a NLS ship built before July 1, 1994, the ballast is deemed to contain less than 1 ppm of the noxious liquid substance previously carried if the cargo tank is washed

• (a) with a water quantity not less than that required by section 20 of Appendix 6 of Annex II to the Pollution Convention using a factor of k equal to 1.0 in the formula; or

• (b) in accordance with the provisions set out in Appendix 6 of Annex II to the Pollution Convention and subsequently washed with a complete cycle of the cleaning machine.

(3) In the case of an NLS ship other than a ship referred to in subsection (2), the ballast water is deemed to contain less than 1 ppm of the substance previously carried if the cargo tank is washed in accordance with provisions set out in Appendix 6 of Annex II to the Pollution Convention.