River: Letaba Monitoring site: B8H028Q01 EWR Site: 7 Water quality metrics TPC The 95th percentile of the data must be between 18.5 - 23 MgSO4 mg/L The 95th percentile of the data must be between 16 20 – Na2SO4 mg/L The 95th percentile of the data must be between 24 30 – MgCl2 mg/L Inorganic salts(a) The 95th percentile of the data must be between 46 57 – CaCl2 mg/L The 95th percentile of the data must be between 153 191 – NaCl mg/L The 95th percentile of the data must be between 281 351 – CaSO4 mg/L The 95th percentile of the data must be between 44 55 – EC mS/m 5th percentile of the data must not be less than 6.7. pH 95th percentile of the data must not be greater than 8.6. Unnatural deviation from the natural temperature range. Temperature Physical variables Initiate baseline monitoring. 5th percentile of the data must be 7.2 7.0 mg/L. Initiate – Dissolved oxygen baseline monitoring for this variable. deviation from the natural conditions. Initiate baseline Turbidity monitoring. The 50th percentile of the data must be between 0.2 0.25 – TIN mg/L Nutrients The 50th percentile of the data must be between 0.02 0.025 – PO4-P mg/L Chl-a phytoplankton The 50th percentile of the data must be between 12 15 – μg/L Response variables The 50th percentile of the data must be between 17 21 – Chl-a periphyton mg/m2 Toxics listed in DWA The 95th percentile of the data must be within the A category (2008) boundaries Toxics An impact is expected if the 95th percentile of the data Other exceeds the Chronic Effects Value (CEV) as stated in DWAF (1996) (a) To be generated using TEACHA when the TPC for EC is exceeded or salt pollution expected
River: Letaba Monitoring site: B8H028Q01 EWR Site: 7 Water quality metrics TPC Inorganic salts(a) MgSO4 The 95th percentile of the data must be between 18.5 - 23 mg/L Na2SO4 The 95th percentile of the data must be between 16 – 20 mg/L MgCl2 The 95th percentile of the data must be between 24 – 30 mg/L CaCl2 The 95th percentile of the data must be between 46 – 57 mg/L NaCl The 95th percentile of the data must be between 153 – 191 mg/L CaSO4 The 95th percentile of the data must be between 281 – 351 mg/L Physical variables EC The 95th percentile of the data must be between 44 – 55 mS/m pH 5th percentile of the data must not be less than 6.7. 95th percentile of the data must not be greater than 8.6. Temperature Unnatural deviation from the natural temperature range. Initiate baseline monitoring. Dissolved oxygen 5th percentile of the data must be 7.2 – 7.0 mg/L. Initiate baseline monitoring for this variable. Turbidity deviation from the natural conditions. Initiate baseline monitoring. Nutrients TIN The 50th percentile of the data must be between 0.2 – 0.25 mg/L PO4-P The 50th percentile of the data must be between 0.02 – 0.025 mg/L Response variables Chl-a phytoplankton The 50th percentile of the data must be between 12 – 15 μg/L Chl-a periphyton The 50th percentile of the data must be between 17 – 21 mg/m2 Toxics Toxics listed in DWA (2008) The 95th percentile of the data must be within the A category boundaries Other An impact is expected if the 95th percentile of the data exceeds the Chronic Effects Value (CEV) as stated in DWAF (1996) (a) To be generated using TEACHA when the TPC for EC is exceeded or salt pollution expected