Statement of Water Quality Objectives (Mirs Bay Water Control Zone) (Chapter 358U)

STATEMENT OF WATER QUALITY OBJECTIVES (MIRS BAY WATER CONTROL ZONE) CHAPTER 358U LONG TITLE Empowering section VerDate:30/06/1997 (Cap 358 Section 5) [30 November 1990] (L.N. 382 of 1990) PARAGRAPH 1 VerDate:30/06/1997 The water qualify objectives set out in column 1 of the Schedule are established for those parts of the Mirs Bay Water Control Zone set opposite those water qualify objectives in column 2. (Enacted 1990) PARAGRAPH 2 VerDate:30/06/1997 In this statement "Fish Culture Subzone" means the area delineated as such on maps MBWCZ 1, MBWCZ 2 and MBWCZ 3; "map MBWCZ 1", "map MBWCZ 2" , "map MBWCZ 3" , "map MBWCZ 4" and "map MBWCZ 5" mean a series of maps numbered as such and signed by the Secretary for Planning, Environment and Lands on 23 November 1990 and deposited in the Land Registry, Victoria; (8 of 1993 s. 30) "marine waters" means all waters below the high water mark within the boundaries of the Mirs Bay Water Control Zone; "Secondary Contact Recreation Subzone" means the area delineated as such on maps MBWCZ 1, MBWCZ 2, MBWCZ 3, MBWCZ 4 and MBWCZ 5; "Water Gathering Ground Subzone" means the area delineated as such on maps MBWCZ 1 and MBWCZ 3. (Enacted 1990) SCHEDULE VerDate:30/06/1997 [paragraph 1] Water Quality Objective Part or Parts of Zone A. AESTHETIC APPEARANCE (a) Waste discharges shall cause no objectionable odours or Whole Zone discolouration of the water. (b) Tarry residues, floating wood, articles made of glass, plastic, Whole Zone rubber or of any other substances should be absent. (c) Mineral oil should not be visible on the surface. Surfactants Whole Zone should not give rise to a lasting foam. (d) There should be no recognisable sewage-derived debris. Whole Zone (e) Floating, submerged and semi-submerged objects of a size likely to Whole Zone interfere with the free movement of vessels, or cause damage to vessels, should be absent. (f) Waste discharges shall not cause the water to contain substances which Whole Zone settle to form objectionable deposits. B. BACTERIA (a) The level of Escherichia coli should not exceed 610 per 100mL, Secondary Contact calculated as the geometric mean of all samples collected in one calendar Recreation Subzones year. and Fish Culture Subzones (L.N. 456 of 1991) (b) The level of Escherichia coli should be zero per 100 ml, calculated as Water Gathering the running median of the most recent 5 consecutive samples taken at Ground Subzones intervals of between 7 and 21 days. (c) The level of Escherichia coli should not exceed 1000 per 100 ml, Other inland calculated as the running median of the most recent 5 consecutive samples waters of the Zone taken at intervals of between 7 and 21 days. C. COLOUR (a) Waste discharges shall not cause the colour of water to exceed 30 Water Gathering Hazen units. Ground Subzones (b) Waste discharges shall not cause the colour of water to exceed 50 Other inland Hazen units. waters of the Zone D. DISSOLVED OXYGEN (a) Waste discharges shall not cause the level of dissolved oxygen to fall Marine waters below 4 milligrams per litre for 90% of the sampling occasions during the excepting Fish year; values should be calculated as water column average (arithmetic mean Culture Subzones of at least 3 measurements at 1 metre below surface, mid-depth and 1 metre above seabed). In addition, the concentration of dissolved oxygen should not be less than 2 milligrams per litre within 2 metres of the seabed for 90% of the sampling occasions during the year. (b) The dissolved oxygen level should not be less than 5 milligrams per Fish Culture litre for 90% of the sampling occasions during the year; values should be Subzones calculated as water column average (arithmetic mean of at least 3 measurements at 1 metre below surface, mid-depth and 1 metre above seabed). In addition, the concentration of dissolved oxygen should not be less than 2 milligrams per litre within 2 metres of the seabed for 90% of the sampling occasions during the year. (c) Waste discharges shall not cause the level of dissolved oxygen to be Water Gathering less than 4 milligrams per litre. Ground Subzones and Other inland waters E. pH (a) The pH of the water should be within the range of 6.5-8.5 units. In Marine waters addition, waste discharges shall not cause the natural pH range to be extended by more than 0.2 units. (b) Waste discharges shall not cause the pH of the water to exceed the Water Gathering range of 6.5-8.5 units. Ground Subzones (c) The pH of the water should be within the range of 6.0-9.0 units. Other inland waters of the Zone F. TEMPERATURE Waste discharges shall not cause the natural daily temperature range to Whole Zone change by more than 2.0 degree Celsius. G. SALINITY Waste discharges shall not cause the natural ambient salinity level to Whole Zone change by more than 10%. H. SUSPENDED SOLIDS (a) Waste discharges shall neither cause the natural ambient level to be Marine waters raised by 30% nor give rise to accumulation of suspended solids which may adversely affect aquatic communities. (b) Waste discharges shall not cause the annual median of suspended Water Gathering solids to exceed 20 milligrams per litre. Ground Subzones and Other inland waters of the Zone I. AMMONIA The un-ionized ammoniacal nitrogen level should not be more than 0.021 Whole Zone milligram per litre, calculated as the annual average (arithmetic mean). J. NUTRIENTS (a) Nutrients shall not be present in quantities sufficient to cause Marine waters excessive or nuisance growth of algae or other aquatic plants. (b) Without limiting the generality of objective (a) above, the level of inorganic nitrogen should not exceed 0.3 milligram per litre, expressed as annual water column average (arithmetic mean of at least 3 measurements at 1 metre below surface, mid-depth and 1 metre above seabed). K. 5-DAY BIOCHEMICAL OXYGEN DEMAND (a) Waste discharges shall not cause the 5-day biochemical oxygen demand Water Gathering to exceed 3 milligrams per litre. Ground Subzones (b) Waste discharges shall not cause the 5-day biochemical oxygen demand Other inland to exceed 5 milligrams per litre. waters of the Zone L. CHEMICAL OXYGEN DEMAND (a) Waste discharges shall not cause the chemical oxygen demand to exceed Water Gathering 15 milligrams per litre. Ground Subzones (b) Waste discharges shall not cause the chemical oxygen demand to exceed Other inland 30 milligrams per litre. waters of the Zone M. TOXINS (a) Waste discharges shall not cause the toxins in water to attain such Whole Zone levels as to produce significant toxic, carcinogenic, mutagenic or teratogenic effects in humans or fish or any other aquatic organisms, with due regard to biologically cumulative effects in food chains and to toxicant interactions with each other. (b) Waste discharges shall not cause a risk to Whole Zone any beneficial Whole Zone uses of the aquatic environment. (Enacted 1990)