303 



(a) the ship is proceeding en route at a speed of at least 7 knots [4 knots for 



barges] ; , , 4. 



(It) procedures and arrangements for the discharge shall be such as to assure 

 the Administration " ' on the basis of reliable calculation, that the concentration 

 of the substance discharged may be expected not to exceed 1 part per million ui 

 the wake immediately astern of the ship ; 



(c) the maximum quantity of cargo discharged into the sea from each tank 

 and its associated piping system does not exceed [1] cubic metre or [1/3,000] 

 of the tank capacity in cubic metres, whichever is the greater ; 



(d) the discharge is made below the waterline, taking into account the loca- 

 tion of the sea water intakes ; and 



(e) the discharge is made with the ship not less than [12] nautical miles 

 from the nearest land and in a depth of water of not less than [25] metres. 



(3) The discharge into the sea of substances in Category C, as defined in 

 Regulation 3(1) (c) of this Annex or those provisionally categorized as such 

 or ballast water, tank washings, or other residues or mixtures containing siich 

 substances shall be prohibited. However, such mixtures may be discharged when 

 the following conditions are all satisfied '" : 



( a ) the ship is proceeding en route at a speed of at least 7 knots [4 knots for 

 barges] ; 



(b) procedures and arrangements for the discharge shall be such as to assure 

 the Administration " ' on the basis of reliable calculation that the concentration 

 of the substance discharged may be expected not to exceed [10 parts per mil- 

 lion] '- in the wake immediately astern of the ship ; 



(c) the maximum quantity of cargo discharged from each tank and its as- 

 sociated piping system does not exceed [3] cubic metres or [1/1,000 of the tank 

 capacity in cubic metres, whichever is the greater ; 



(d) the discharge is made below the waterline, taking into account the loca- 

 tion of the sea water intakes ; and 



(e) the discharge is made with the ship not less than [12] nautical miles from 

 the nearest land and in a depth of water of not less than [25] metres. 



(4) Approved ventilation procedures may be used to remove cargo residues 

 from a tank provided that tlie Administration is satisfied that the results of 

 such procedures will be at least equivalent to those obtained by the require- 

 ments of paragraphs (1), (2) or (3) of this Regulation, whichever is applicable. 



(5) The discharge of substances which have not been categorized, provisionally 

 cateirorized, or evaluated as referred to in Regulation 4 of this Annex, or of 

 bal'ast water, tank washings, or other residues or mixtures containing such 

 substances shall be prohibited. 



(6) The discharge of clean ballast shall not be subject to the requirements 

 of this Regulation. 



BEXJULATION 6 — EXCEPTIONS 



Regulation 5 of this Annex shall not apply to : 



(a) the di.scharge of noxious substances or mixtures containing such sub- 

 stances, necessary for the purpose of securing the safety of the ship or saving life 

 at sea ; or 



(b) the escape of noxious substances or mixtures containing such substances 

 resulting from damage to a sliip or its equipment, if all reasonable precautions 

 have been taken after the occurrence of the damage or discovery of the leakage 

 for the purpose of preventing or minimizing the escape ; or 



(c) the discharge into the sea of noxious substances approved by a Contracting 

 Government for the purpose of comltating a specific pollution incident, when used 

 for that purpose under the supervision, of that Government, with a view to mini- 

 mizing the possible general damage from the pollution. 



" Sep footnote 6. 

 '" Sep footnotp fi. 

 " Spp footnotp 6. 



"(1) The criteria specified in sub-parnjrrarihs (h), (c) antl (p) of paraeraphs (2) and 

 (ii) of this Regulation are interdppendent and must hp considpred in relation to each 

 other. 



(ii) One delegation was of the opinion that for a figure of 3 cubic metres in sub- 

 paragraph (c) below, this concentration should be limited to 3 ppm. 



