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(Cap 358, section 5) [18 June 1982] (L.N. 232 of 1982) Cap 358B TOLO HARBOUR AND CHANNEL WATER CONTROL ZONE STATEMENT OF WATER QUALITY OBJECTIVES The water quality objectives set out in the first column of the First Schedule have been established for the subzones defined in the Second Schedule set opposite such water quality objectives in the second column of the First Schedule. Cap 358B Sched 1 Water Quality Objective Subzone A. AESTHETIC APPEARANCE (i) Odours, taints and colours Waste discharges shall cause no noxious or offensive odour or offensive taint or colour in either waters or edible aquatic organisms in the subzone to be present in concentrations detectable by bioassay or organoleptic tests. (ii) Visible matter Waste discharges shall cause no visible foam, oil, grease, scum, litter or other objectionable matter in waters of the subzone. (i) Harbour subzone. (ii) Buffer subzone. (iii) Channel subzone. (i) Harbour subzone (ii) Buffer subzone (iii) Channel subzone B. BACTERIA The level of Escherichia coli should not exceed 610 per 100 mL, calculated as the geometric mean of all samples collected in one calendar year. (i) Secondary contact recreation subzone (ii) Fish culture subzones (L.N. 454 of 1991) C. CHLOROPHYLL-A Waste discharges shall not cause the level of chlorophyll-a in waters of the subzone to exceed 20 milligrams per cubic metre, calculated as a running arithmetic mean of 5 daily measurements for any single location and depth. Waste discharges shall not cause the level of chlorophyll-a in waters of the subzone to exceed 10 milligrams per cubic metre, calculated as a running arithmetic mean of 5 daily measurements for any single location and depth. Waste discharges shall not cause the level of chlorophyll-a in waters of the subzone to exceed 6 milligrams per cubic metre, calculated as a running arithmetic mean of 5 daily measurements for any single location and depth. Harbour subzone. Buffer subzone Channel subzone. D. DISSOLVED OXYGEN Waste discharges shall not cause the level of dissolved oxygen in waters of the subzone to be less than 2 milligrams per litre within two metres of the bottom, or to be less than 4 milligrams per litre in the remainder of the water column. Waste discharges shall not cause the level of dissolved oxygen in waters of the subzone to be less than 3 milligrams per litre within two metres of the bottom, or to be less than 4 milligrams per litre in the remainder of the water column. Waste discharges shall not cause the level of dissolved oxygen in waters of the subzone to be less than 4 milligrams per litre at any point in the water column. Harbour subzone Buffer subzone Channel subzone. E. LIGHT PENETRATION No changes in turbidity, suspended material, colour or other parameters arising from waste discharges shall reduce light transmission by more than 20 per cent of the normal level in the subzone at any location or any time. No changes in turbidity, suspended material, colour or other parameters arising from waste discharges shall reduce light transmission by more than 15 per cent of the normal level in the subzone at any location or any time. No changes in turbidity, suspended material, colour or other parameters arising from waste discharges shall reduce light transmission by more than 10 per cent of the normal level in the subzone at any location or any time. Harbour subzone Buffer subzone Channel subzone F. pH Waste discharges shall not cause the normal pH range of any waters of the subzone to be extended by greater than +/- 0.5 pH units at any time. Waste discharges shall not cause the normal pH range of any waters of the subzone to be extended by greater than +/- 0.3 pH units at any time. Waste discharges shall not cause the normal pH range of any waters of the subzone to be extended by greater than +/- 0.1 pH units at any time. Harbour subzone Buffer subzone Channel subzone G. SALINITY Waste discharges shall not cause the normal salinity range of any waters of the subzone to be extended by greater than +/- 3 parts per thousand at any time. (i) Harbour subzone (ii) Buffer subzone (iii) Channel subzone H. SETTLEABLE MATERIAL Waste discharges shall give rise to no bottom deposits or submerged objects which adversely influence bottom-living communities, alter the basic Harbour geometry or shipping channels, present any hazard to shipping or diving activities, or affect any other beneficial use of the waters of the subzone. (i) Harbour subzone (ii) Buffer subzone (iii) Channel subzone I. TEMPERATURE Waste discharges shall not cause the natural daily temperature range in waters of the subzone to be extended by greater than +/- 1.0℃ at any location or time. The rate of temperature change shall not exceed 0.5℃ per hour at any location, unless due to natural phenomena. (i) Harbour subzone (ii) Buffer subzone (iii) Channel subzone J. TOXICANTS Waste discharges shall not cause the toxicants in waters of the subzone to attain such a level as to produce significant toxic effects in humans, fish or any other aquatic organism, with due regard to biologically cumulative effects in food chains and to toxicant inter- actions with each other. (i) Harbour subzone (ii) Buffer subzone (iii) Channel subzone Cap 358B Sched 2 In this statement- "Harbour subzone" (海港分区) means all that water bounded by the spring high-water mark of the contiguous south-western land mass and by lines between the southern tip of Yim Tin Tsai (22o 26'55"N, 114o 12'49"E) and the northern tip of Centre Island (22o 26'34"N, 114o 13'11"E) and between the northern tip of Centre Island and the western tip of Wu Kai Sha Tsui (22o 26'20"N, 114o 14'02"E) and more particularly referred to and recorded in the Register; "Buffer subzone" (缓冲分区) means all that water bounded by the limits of the Tolo Harbour Zone to the southwest, by the spring high-water marks on the northern and southern coasts, and by a line between the northwest tip of Three Fathoms Cove (22o 26'09"N, 114o 15'56"E) and the opposite (northern) coast, passing directly through the northern tip of Bush Reef (22o 26'56"N, 114o 15'18"E) and joining the northern coast at Pak Sha Tau Chau (Harbour Island) at 22o 27'19"N, 114o 15'01"E, and more particularly referred to and recorded in the Register; "Channel subzone" (海峡分区) means all that water bounded by the limits of the Tolo Buffer Zone to the southwest, by the spring high-water marks on the northern and southern coasts, and by a line joining the eastern tip of Bluff Head (22o 30'34"N, 114o 20'02"E) and the northern tip of Ocean Point (22o 28'50"N, 114o 20'20"E) and more particularly referred to and recorded in the Register. "Secondary contact recreation subzone" (次级接触康乐活动分区) means the Harbour subzone, the Buffer subzone and the Channel subzone except any Fish culture subzone situated therein; (L.N. 454 of 1991) "Fish culture subzone" (鱼类养殖分区) means a fish culture zone that is designated in the Fish Culture Zone (Designation) Order (Cap 353 sub. leg.) and situated in the Tolo Harbour and Channel Water Control Zone. (L.N. 454 of 1991)