583 



into the sea for that substance under Eegiilation 5(2) (c) of 

 this Annex outside special areas in the case of Category B 

 substances, or under Kegulations 5(3) (c) and 5(9) (c) out- 

 side and within special areas respectively in the case of Cate- 

 gory C substances. An appropriate entry shall be made in the 

 Cargo Record Book ; 



(iii) where it is intended to discharge the quantity of sub- 

 stance remaining into the sea the approved procedures shall 

 be complied with, and the necessary dilution of the substance 

 satisfactory for such a discharge shall be achieved. An appro- 

 priate entry shall be made in the Cargo Record Book ; or 



(iv) where the tank washings are not discharged into the 

 sea, if any internal transfer of tank washings takes place 

 from that tank an appropriate entry shall be made in the 

 Cargo Record Book ; and 



(v) any subsequent discharge into the sea of such tank 

 washings shall be made in accordance with the requirements 

 of Regulation 5 of this Annex for the appropriate area and 

 Category of substance involved. 



( c ) If the tank is to be cleaned in port : 



(i) the tank wasliings shall be discharged to a reception 

 facility and an appropriate entry shall be made in the Cargo 

 Record Book ; or 



(ii) the tank washings shall be retained on board the ship 

 and an appropriate entry shall be made in the Cargo Record 

 Book indicating the location and disposition of the tank 

 washings. 



(d) If after unloading a Category C substance within a special 

 area, any residues or tank washings are to be retained on board 

 until the ship is outside the special area, the Master shall so indi- 

 cate by an appropriate entry in the Cargo Record Book and in 

 this case the procedures set out in Regulation 5(3) of this Annex 

 shall be applicable. 



Co.tegory B Substances Within Special Areas 



(6) Subject to such surveillance and approval by the authorized 

 or appointed surveyor as may be deemed necessary by the Government 

 of the Party, the Master of a ship shall, with respect to a Category B 

 substance within a special area, ensure compliance with the following : 



(a) If a tank is partially unloaded or unloaded but not cleaned, 

 an appropriate entry shall be made in the Cargo Record Book. 



(b) Until that tank is cleaned every subsequent pumping or 

 transfer operation carried out in connection with that tank shall 

 also be entered in the Cargo Record Book. 



(c) If the tank is to be washed, the effluent from the tank wash- 

 ing operation, which shall contain a volume of water not less than 

 0.5 per cent of the total volume of the tank, shall be discharged 

 from the ship to a reception facility until the tank, its pump and 

 piping system are empty. An appropriate entry shall be made in 

 the Cargo Record Book. 



(d) If the tank is to be further cleaned and emptied at sea, the 

 Master shall : 



