Statement of Water Quality Objectives (North Western Supplementary Water Control Zone) (Chapter 358AZ)

STATEMENT OF WATER QUALITY OBJECTIVES (NORTH WESTERN SUPPLEMENTARY WATER CONTROL ZONE) CHAPTER 358AZ LONG TITLE Empowering section VerDate:24/09/1999 (Cap 358, section 5) [24 September 1999] (L.N. 228 of 1999) SECT 1 VerDate:24/09/1999 The water quality objectives set out in column 1 of the Schedule are established for those parts of the North Western Supplementary Water Control Zone set opposite those water quality objectives in column 2 of the Schedule. SECT 2 VerDate:24/09/1999 In this Statement "Map" means the map marked NWSWCZ and described as "NORTH WESTERN SUPPLEMENTARY WATER CONTROL ZONE", signed by the Secretary for Planning, Environment and Lands on 3 September 1999 and deposited in the Land Registry at Victoria; "Secondary Contact Recreation Subzone" means an area delineated as such on the Map. SCHEDULE SCHEDULE VerDate:24/09/1999 [section 1] Water Quality Objective Part or Parts of Zone A. AESTHETIC APPEARANCE (a) Waste discharges should not cause any objectionable odour or Whole zone discolouration of the water. (b) Tarry residues, floating wood, articles made of glass, plastic, rubber or of any other substances should be absent. Whole zone (c) Mineral oil should not be visible on the surface. Surfactants should not give rise to a lasting foam. Whole zone (d) There should be no recognizable sewage-derived debris. Whole zone (e) Floating, submerged and semi-submerged objects of a size likely to interfere with the free movement of vessels, or cause damage to vessels, should be absent. Whole zone (f) Waste discharges should not cause the water to contain substances which settle to form objectionable deposits. Whole zone B. BACTERIA The level of Escherichia coli should not exceed 610 per 100 mL, Secondary Contact calculated as the geometric mean of all samples collected in a calendar year. Recreation Subzones C. DISSOLVED OXYGEN Waste discharges should not cause the level of dissolved oxygen to fall Whole zone below 4 mg per litre for 90% of the sampling occasions during the whole year; values should be calculated as the water column average (arithmetic mean of at least 3 measurements at 1 m below surface, mid-depth and 1 m above seabed). In addition, the concentration of dissolved oxygen should not be less than 2 mg per litre within 2 m of the seabed for 90% of the sampling occasions during the whole year. D. pH Waste discharges should not cause the natural pH range of the water to be Whole zone extended by more than 0.2 unit. In addition, the pH of the water should be in the range of 6.5-8.5 units. E. TEMPERATURE Waste discharges should not cause the natural daily temperature range to Whole zone change by more than 2.00C. F. SALINITY Waste discharges should not cause the natural ambient salinity level to Whole zone change by more than 10%. G. SUSPENDED SOLIDS Waste discharges should not cause the natural ambient level to be raised Whole zone by more than 30% or give rise to accumulation of suspended solids which may adversely affect aquatic communities. H. AMMONIA The un-ionized ammoniacal nitrogen level should not be more than Whole zone 0.021 mg per litre, calculated as the annual average (arithmetic mean). I. NUTRIENTS (a) Nutrients should not be present in quantities sufficient to cause excessive or nuisance growth of algae or other aquatic plants. Whole zone (b) Without limiting the generality of objective (a) above, the level of inorganic nitrogen should not exceed 0.5 mg per litre, expressed as annual water column average (arithmetic mean of at least 3 measurements at 1 m below surface, mid-depth and 1 m above seabed). Whole zone J. TOXIC SUBSTANCES (a) Toxic substances in the water should not attain such levels as to produce significant toxic, carcinogenic, mutagenic or teratogenic effects in humans, fish or any other aquatic organisms, with due regard to biologically cumulative effects in food chains and to interactions of toxic substances with each other. Whole zone (b) Human activity should not cause a risk to any beneficial use of the aquatic environment. Whole zone