Screens (metres) Perforated casing at – – 479.5 Year drilled 1925 1936 1974 Standing water level 45.7 metres (1925) 53.0 metres – (natural surface (1974) elevation) Total depth (metres) 479.5 260 180.4 Natural surface 224 177 – elevation (mAHD) Facility status Existing Existing Existing Physicochemical parameters EC (µS/cm) 638 837 771 pH (field/lab) 7.8 8.1 8.2 Temperature (°C) 48.7 43.2 40 Chemical parameters (milligrams per litre) Dissolved oxygen – – – TDS – – – TSS 380 498 461 Sodium (Na) 146 194 178 Potassium (K) 1.5 1.6 1.5 Calcium (Ca) 2.3 3.6 3.8 Magnesium (Mg) 0.1 0.01 0.1 Chlorine (Cl) 43 74 74 Sulfate (SO4) 1 1 1 Total alkalinity 273 337 304 (calcium carbonate) Bicarbonate (HCO3–) 323 399 363 Carbonate (CO32–) 4.8 5.4 4.2 Fluoride (F) 0.7 0.99 0.83 Bromine (Br) – – – Aluminium (Al) 0.05 0.05 0.05 Arsenic (As) – – – Barium (Ba) – – – Cobalt (Co) – – – Iron (Fe) 0.01 0.01 0.01 Manganese (Mn) 0.03 0.01 0.01
Screens (metres) Perforated casing at 479.5 – – Year drilled 1925 1936 1974 Standing water level (natural surface elevation) 45.7 metres (1925) – 53.0 metres (1974) Total depth (metres) 479.5 260 180.4 Natural surface elevation (mAHD) 224 – 177 Facility status Existing Existing Existing Physicochemical parameters EC (µS/cm) 638 837 771 pH (field/lab) 7.8 8.1 8.2 Temperature (°C) 48.7 43.2 40 Chemical parameters (milligrams per litre) Dissolved oxygen – – – TDS – – – TSS 380 498 461 Sodium (Na) 146 194 178 Potassium (K) 1.5 1.6 1.5 Calcium (Ca) 2.3 3.6 3.8 Magnesium (Mg) 0.1 0.01 0.1 Chlorine (Cl) 43 74 74 Sulfate (SO4) 1 1 1 Total alkalinity (calcium carbonate) 273 337 304 Bicarbonate (HCO3–) 323 399 363 Carbonate (CO32–) 4.8 5.4 4.2 Fluoride (F) 0.7 0.99 0.83 Bromine (Br) – – – Aluminium (Al) 0.05 0.05 0.05 Arsenic (As) – – – Barium (Ba) – – – Cobalt (Co) – – – Iron (Fe) 0.01 0.01 0.01 Manganese (Mn) 0.03 0.01 0.01
gab-springs-survey-vol-2_0.docx