713 



able sludge deposits, or that will adversely affect aquatic life or 

 waterfowl. 



(e) (9?7, PetrochemicaJs and Immiscible Substances. Waters 

 should be free from floating debris, oil, scum and other floating 

 materials attributable to municipal, industrial or other discharges 

 in amounts sufficient to be unsightly or deleterious. 



3. Non-degradation. Notwithstanding the adoption of specific v/ater 

 ■quality objectives, all reasonable and practicable measures shall be 

 taken in accordance with paragraph 4 of Article III of the Agree- 

 ment to maintain the levels of water quality existing at the date of 

 ■entry into force of the Agreement in those areas of the boundary 

 waters of the Great Lakes System where such levels exceed the specific 

 water quality objectives. 



4. Sampling Data. The Parties agree that the determination of com- 

 pliance with specific objectives shall be based on statistically valid 

 sampling data. 



5. Mixing Zones. The responsible regulatory agencies may desig- 

 nate restricted mixing zones in the vicinity of outfalls within which 

 the specific water quality objectives shall not apply. Mixing zones 

 shall not be considered a substitute for adequate treatment or control 

 of discharges at their source. 



6. Localized Areas. There will be other restricted, localized areas, 

 such as harbours, where existing conditions such as land drainage ancl 

 land use will prevent the objectives from being met at least over the 

 short term ; such areas, however, should be identified specifically and 

 as early as possible by the responsible regulatory agencies and should 

 be kept to a minimum. Pollution from such areas shall not contribute 

 to the violation of the water quality objectives in the waters of the 

 other Party. The International Joint Commission shall be notified of 

 the identification of such localized areas, in accordance with Article 

 VIII. 



7. Consultation. The Parties agree to consult within one year from 

 the date of entry into force of the Agreement, for the purpose of 

 considering : 



(a) Specific water quality objectives for the following 

 substances : 



Ammonia Lead 



Arsenic Mercury 



Barium Nickel 



Cadmium Oil 



Chloride Organic chemicals 



Chromium Phenols 



Copper Selenium 



Cyanide Sulphate 



Fluoride Zinc 



(b) Refined objectives for radioactivity and temperature; for 

 radioactivity the objective shall be considered in the light of the 

 recommendations of the International Commission on Radiation 

 Protection. 



8. Amendment. 



(a) The objectives adopted herein shall be kept under review 

 and may be amended by mutual agreement of the Parties. 



(b) Whenever the International Joint Commission, acting pur- 

 suant to Article VI of the Agreement, shall recommend the estab- 



