98 
CirrAPTER II—REQUIREMENTS FOR CONTROL OF OPERATIONAL POLLUTION 
Regulation 9 
CONTROL DISCHARGE OF OIL 
(1) Subject to the provisions of Regulations 10 and 11 of this Annex and 
paragraph (2) of this Regulation, any discharge into the sea of oil or oily mix- 
tures from ships to which this Annex applies shall be prohibited except when 
all the following conditions are satisfied : 
(a) For an oil tanker, except as provided for in sub-paragraph (b) of this 
paragraph: (i) the tanker is not within a special area; (ii) the tanker is more 
than 50 nautical miles from the nearest land; (iii) the tanker is proceeding en 
route; (iv) the instantaneous rate of discharge of oil content does not exceed 60 
litres per nautical mile; (v) the total quantity of oil discharged into the sea does 
exceed for existing tankers 1/15,000 of the total quantity of the particular cargo 
of which the residue formed a part, and for new tankers 1/30,000 of the total 
quantity of the particular cargo of which the residue formed a part; and (iv) 
the tanker has in operation, except as provided for in Regulation 15(3) of this 
Annex, an oil discharge monitoring and control system and a slop tank arrange- 
ment as required by Regulation 15 of this Annex ; 
(b) From a ship of 400 tons gross tonnage and above other than an oil tanker 
and from machinery space bilges excluding cargo pump room bilges of an oil 
tanker unless mixed with vil cargo residue: (i) the ship is not within a speciul 
aurea; (ii) the ship is more than 12 nautical miles from the nearest land; (iii) 
the ship is proceeding en route; (iv) the oil content of the effluent is less than 
100 parts per million; and (v) the ship has in operation an oil discharge moni- 
toring and control system, oily water separating equipment, oil filtering systein 
or other installation as required by Regulation 16 of this Annex. 
(2) In the case of a ship of less than 400 tons gross tonnage other than an oil 
tanker whilst outside the special area, the Administration shall ensure that it is 
equipped as far as practicable and reasonable with installations to ensure the 
storage of oil residues on board and their discharge to reception facilities or into 
the sea in compliance with the requirements of paragraph (1) (b) of this Regu- 
lation. 
(3) Whenever yisible traces of oil are observed on or below the surface of the 
water in the immediate vicinity of a ship or its wake, Governments of Parties to 
the Convention should, to the extent they are reasonably able to do So, promptly 
investigate the facts bearing on the issue of whether there has been a violation of 
the provisions of this Regulation or Regulation 10 of this Annex. The investiga- 
tion should include, in particular, the wind and sea conditions, the track and 
speed of the ship, other possible sources of the visible traces in the vicinity, and 
any relevant oil discharge records. 
(4) The provisions of paragraph (1) of this Regulation shall not apply to the 
discharge of clean or segregated ballast. The provisions of sub-paragraph (1) (b) 
of this Regulation shall not apply to the discharge of oily mixture which without 
dilution has an oil content not exceeding 15 parts per million. — 
(5) No discharge into the sea shall contain chemicals or other substances in 
quantities or concentrations which are hazardous to the marine environment or 
chemicals or other substances introduced for the purpose of circumventing the 
conditions of discharge specified in this Regulation. 
(6) The oil residues which cannot be discharged into the sea in compliance 
with paragraphs (1), (2) and (4) of this Regulation shall be retained on board 
or discharged to reception facilities. 
Regulation 10 
METHODS FOR TIE PREVENTION OF OIL POLLUTION FROM SHIPS WIILE OPERATING 
IN SPECIAL AREAS 
(1) For the purpose of this Annex the special areas are the Mediterranean Sea 
area, the Bultic Sea area, the Black Sea area, the Red Sea area and the “Gulls 
area” which are defined as follows: 
(a) The Mediterranean Sea area means the Mediterranean Sea proper includ- 
ing the gulfs and seas therein with the boundary between the Mediterranean 
