Regulation 8 Category B and C—tank washing outside Special Areas
Where a Category B substance or a Category C substance is unloaded at a port which is not within a Special Area, then—
(a)
if it was impossible for unloading to be carried out as required by regulation 7 or to the satisfaction of a Marpol surveyor, or
(b)
in any case where the substance in question is a high residue substance,
every tank from which such substance has been unloaded shall be pre-washed and the resulting tank washings shall be discharged into a reception facility at the port of unloading.