|
(Cap 358, section 5) [24 June 1988] (L.N. 172 of 1988) Cap 358F TOLO HARBOUR AND CHANNEL WATER CONTROL ZONE STATEMENT OF WATER QUALITY OBJECTIVES FOR WATERCOURSES The water quality objectives set out in the first column of Schedule 1 have been established for watercourses in the subzones defined in Schedule 2 and delineated in Schedule 3 described opposite such water quality objectives in the second column of Schedule 1. (Enacted 1988) Cap 358F Sched 1 Water Quality Objective for Watercourses Subzone A. AESTHETIC APPEARANCE Waste discharges shall not cause waters of the subzone to contain substances that- (a) settle to form objectionable deposits; (b) float as debris, scum, oil or other matter to form nuisances; (c) produce objectionable colour, odour, taste or turbidity; (d) injure or are toxic or produce adverse physiological responses in humans, animals or plants; or (e) are conducive to undesirable aquatic life or a nuisance to aquatic life. All watercourses B. BACTERIA Waste discharges shall not cause the level of Escherichia coli to exceed 1000 per 100 ml in waters of the subzone, levels to be calculated as a running median of the most recent 5 consecutive samples taken at intervals of between 7 and 21 days (or 14 and 42 days). (a) SM(A) (b) SM(C) (c) SM(D) (d) SM(E) (e) SM(H) (f) SM(I) (g) TP(B) (h) TP(C) (i) other water- courses Waste discharges shall not cause the level of Escherichia coli to exceed 0 per 100 ml in waters of the subzone, levels to be calculated as a running median of the most recent 5 consecutive samples taken at intervals of between 7 and 21 days (or 14 and 42 days). (a) SM(B) (b) SM(F) (c) SM(G) (d) LT(C) (e) LT(D) (f) TP(A) C. COLOUR Waste discharges shall not cause the colour of waters of the subzone to exceed 50 Hazen units at any time. (a) SM(A) (b) SM(C) (c) SM(D) (d) SM(E) (e) SM(H) (f) SM(I) (g) TP(B) (h) TP(C) (i) other water- courses Waste discharges shall not cause the colour of waters of the subzone to exceed 30 Hazen units at any time. (a) SM(B) (b) SM(F) (c) SM(G) (d) LT(C) (e) LT(D) (f) TP(A) D. pH Waste discharges shall not cause the pH of waters of the subzone to exceed the range of 6.0 to 9.0 at any time. (a) SM(D) (b) SM(E) (c) SM(I) (d) other water- courses Waste discharges shall not cause the pH of waters of the subzone to exceed the range of 6.5 to 8.5 at any time. (a) SM(A) (b) SM(B) (c) SM(C) (d) SM(F) (e) SM(G) (f) SM(H) (g) LT(C) (h) LT(D) (i) TP(A) (j) TP(B) (k) TP(C) E. TEMPERATURE All watercourse Waste discharges shall not cause the natural daily temperature range in waters of the subzone to be extended by greater than +/- 2.0 degrees Celsius at any location or time. F. SUSPENDED SOLIDS Waste discharges shall not cause the annual median of suspended solids in waters of the subzone to exceed 25 milligrams per litre. (a) SM(D) (b) SM(E) (c) SM(I) (d) other water- courses Waste discharges shall not cause the annual median of suspended solids in waters of the subzone to exceed 20 milligrams per litre. (a) SM(A) (b) SM(B) (c) SM(C) (d) SM(F) (e) SM(G) (f) SM(H) (g) LT(C) (h) LT(D) (i) TP(A) (j) TP(B) (k) TP(C) G. DISSOLVED OXYGEN Waste discharges shall not cause the level of dissolved oxygen in waters of the subzone to be less than 4 milligrams per litre or 40% saturation (at 15 degrees Celsius) at any time. All watercourses H. 5 DAYS BIOCHEMICAL OXYGEN DEMAND Waste discharges shall not cause the 5 days biochemical oxygen demand in waters of the subzone to exceed 5 milligrams per litre at any time. (a) SM(A) (b) SM(C) (c) SM(D) (d) SM(E) (e) SM(H) (f) SM(I) (g) TP(B) (h) TP(C) (i) other water- courses Waste discharges shall not cause the 5 days biochemical oxygen demand in waters of the subzone to exceed 3 milligrams per litre at any time (a) SM(B) (b) SM(F) (c) SM(G) (d) LT(C) (e) LT(D) (f) TP(A) I. CHEMICAL OXYGEN DEMAND Waste discharges shall not cause the chemical oxygen demand in waters of the subzone to exceed 30 milligrams per litre at any time. (a) SM(A) (b) SM(C) (c) SM(D) (d) SM(E) (e) SM(H) (f) SM(I) (g) TP(B) (h) TP(C) (i) other water- courses Waste discharges shall not cause the chemical oxygen demand in waters of the subzone to exceed 15 milligrams per litre at any time. (a) SM(B) (b) SM(F) (c) SM(G) (d) LT(C) (e) LT(D) (f) TP(A) J. AMMONIACAL NITROGEN Waste discharges shall not cause the ammoniacal nitrogen in waters of the subzone to exceed 0.5 milligrams per litre at any time. All watercourses K. TOXICANTS All watercourses 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. (Enacted 1988) Cap 358F Sched 2 DEFINITION OF SUBZONES 1. A water course is defined as a system that carries natural drainage storm water, excluding foul sewage systems. Wholly enclosed nullahs will not be included except when the condition of the water in the nullah poses a potential health risk to human beings or the environment by draining into a watercourse. |