35. One set of jar tests in a raw water containing 30 TU and an HCO3 alkalinity concentration of 40 mg/L expressed as CaCO3. Given the data below find the optimal coagulant dose, and the theoretical amount of HCO3 (alkalinity) in mg/L that would be consumed at the optimal dose (10 points). MW of Alum - 594 g/mol MW of HCO3 = 61 g/mol Jar Test 1 5 6.0 pH Alum dose (mg/L) Settled turbidity (TU) 1 6.0 4 15 2 6.0 8 8 3 6.0 12 5 4 6.0 16 4 6 6.0 24 14 20 7