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empty. Appropriate entries of these operations shall be made in 

 the Cargo Eecord Book and certified by the surveyor ; 



(b) After diluting the residue then remaining in the tank with 

 at least 5 per cent of the tank capacity of water, this mixture may 

 be discharged into the sea in accordance with the provisions of 

 sub-paragraphs (l)(a), (b) and (c) or 7(a), (b) and(c), which- 

 ever is applicable, or Regulation 5 of this Annex. Appropriate 

 entries of these operations shall be made in the Cargo Eecord 

 Book. ^ ^ ^ 



(4) Where the Government of the receiving Party is satisfied that 

 it is impracticable to measure the concentration of the substance in 

 the efiluent without causing undue delay to the ship, that Party may 

 accept an alternative procedure as being equivalent to sub-paragraph 

 (3) (a) provided that : 



(a) a precleaning procedure for that tank and that substance, 

 based on standards developed by the Organization, is approved 

 by the Administration and that Party is satisfied that such pro- 

 cedure will fulfill the requirements 'of paragraph (1) or (7), 

 whichever is applicable, of Regulation 5 of this Annex with re- 

 spect to the attainment of the prescribed residual concentrations ; 



(b) a surveyor duly authorized by that Party shall certify in 

 the Cargo Record Book that : 



(i) the tank, its pump and piping system have been emp- 

 tied, and that the quantity of cargo remaining in the tank is 

 at or below the quantity on which the approved precleaning 

 procedure referred to in sub-paragraph (ii) of this para- 

 graph has been based ; 



(ii) precleaning has been carried out in accordance with 

 the precleaning procedure approved by the Administration 

 for that tank and that substance ; and 



(iii) tlie tank washings resulting from such precleaning 

 have been discharged to a reception facility and the tank is 

 empty; 



(c) the discharge into the sea of any remaining residue shall 

 be in accordance with the provisions of paragraph (3) (b) of this 

 Regulation and an appropriate entry is made in the Cargo Rec- 

 ord Book. 



Category B Substances Outside Special Areas and Category C Sub- 

 stances in All Areas 

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

 or appointed surveyor as may be deemed necessary by the Govern- 

 ment of the Party, the Master of a ship shall, with respect to a Cate- 

 gory B substance outside special areas or a Category C substance in 

 all areas, ensure compliance with the following: 



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

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



(b) If the tank is to be cleaned at sea : 



(i) the cargo piping system serving that tank shall be 

 drained and an appropriate entry made in the Cargo Record 

 Book; 



(ii) the quantity of substance remaining in the tank shall 

 not exceed the maximum quantity which may be discharged 



