578 



(b) the procedures and arrangements for discharge are ap- 

 proved by the Administration. Such procedures and arrange- 

 ments shall be based upon standards developed by the Organiza- 

 tion and shall ensure that the concentration and rate of discharge 

 of the effluent is such that the concentration of the substance in 

 the wake astern of the ship does not exceed 10 parts per million ; 



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

 and its associated piping system does not exceed the maximum 

 quantity approved in accordance with the procedures referred to 

 in sub-paragraph (b) of this paragraph, which shall in no case ex- 

 ceed the greater of 3 cubic metres or 1/1,000 of the tank capacity 

 in cubic metres ; 



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

 count the location of the sea water intakes ; and 



(e) the discharge is made at a distance of not less than 12 nauti- 

 cal miles from the nearest land and in a depth of water of not 

 less than 25 metres. 



(4) The discharge into the sea of substances in Category D as de- 

 fined in Regulation 3(1) (d) of this Annex, or those provisionally as- 

 sessed as such, or ballast water, tank washings, or other residues or 

 mixtures containing such substances shall be prohibited except when 

 all the following conditions are satisfied : 



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

 . in the case of self-propelled ships or at least 4 knots in the case 



of ships which are not self-propelled ; 



(b) such mixtures are of concentration not greater than one 

 part of the substance in ten parts of water ; and 



(c) the discharge is made at a distance of not less than 12 nauti- 

 cal miles from the nearest land. 



(5) Ventilation procedures apf)roved by the Administration may be 

 used to remove cargo residues from a tank. Such procedures shall be 

 based upon standards developed by the Organization, If subsequent 

 washing of the tank is necessary, the discharge into the sea of the re- 

 sulting tank washings shall be made in accordance with paragraph 

 (1), (2), (3) or (4) of this Regulation, whichever is applicable. 



(6) The discharge into the sea of substances which have not been 

 categorized, provisionally assessed, or evaluated as referred to in Reg- 

 ulation 4(1) of this Annex, or of ballast water, tank washings, or other 

 residues or mixtures containing such substances shall be prohibited. 



Categories A , B and O Substances icithin Special Areas 

 Subject to the provisions of Regulation 6 of this Annex, 



(7) The discharge into the sea of substances in Category A as de- 

 fined in Regulation 3(1) (a) of this Annex, or of those provisionally 

 assessed as such, or ballast water, tank washings, or other residues or 

 mixtures containing such substances shall be prohibited. If tanks con- 

 taining such substances or mixtures are to be washed the resulting 

 residues shall be discharged to a reception facility which the States 

 bordering the special area shall provide in accordance with Regula- 

 tion 7 of this Annex, until the concentration of the substance in the 

 effluent to such facility is at or below the residual concentration pre- 

 scribed for that substance in column IV of Appendix II to this Annex 



