Volume Three Appendix 5 Schedule 2 – Water Quality Classification Standards Standard/Parameter Interpretation of Standard/Parameter Classification Aquatic Life pH AE, FS - 8.5. The pH range must be from 6.5 to Particulate Organic Material (POM) - The daily average concentration of POM must not exceed 4m g/l. Toxicants Must not exceed the limits (µg/l -1 ) in the following list: - Aluminium 55.00 Mercury 0.60 (pH>6.5) (inorganic) Ammonia-N (at pH 0.05 Nickel 11.00 = 8.0, temperature = 20°C) Arsenic (As III) 24.00 Nitrate (NON) 2.40 3 Arsenic (As V) 13.00 Selenium (Total) 11.00 Boron 370.00 Silver 0.05 Cadmium 0.20 Zinc 8.00 Chromium (CrVI) 1.00 Chlorine 3.00 Copper 1.40 Cyanide 7.00 Lead 3.40 Hydrogen sulfide 1.00 Manganese 1900.00 Biological Growths - Bacterial and/or fungal slime growths must not be visible to AE, FS the naked eye as obvious plumose growths or mats. - The daily average carbonaceous BOD due to dissolved 5 organic compounds (i.e. those passing a GF/C filter) must not exceed 2mg/l. - Dissolved reactive phosphorus (DRP) must be <0.015mg/l when rivers are at < median flow. - Dissolved inorganic nitrogen (DIN) must be <0.444mg/l when rivers are at < median flow. Temperature - The daily maximum temperature must be ≤ 21°C, subject to AE, FS, F natural inputs. - The natural temperature of the water must not be changed by more than 3°C. Turbidity - Turbidity must be no greater than 5.6 Nephelometric Turbidity AE, FS, CR Units. App 5 – 19