6-1. The following mineral analysis was reported for a water sample taken from Well No. 1 at the Eastwood Manor Subdivision near McHenry, Illinois (Woller and Sanderson, 1976a). Well No. 1, Lab No. 02694, November 9, 1971 Iron 0.2 Silica (SiO2) 20.0 Manganese 0.0 Fluoride 0.35 Ammonium 0.5 Boron 0.1 Sodium 4.7 Nitrate 0.0 Potassium 0.9 Chloride 4.5 Calcium 67.2 Sulfate 29.0 Magnesium 40.0 Alkalinity 284.0 as CaCO, Barium 0.5 pH 7.6 units Note: All reported as "mg/L as the ion" unless stated otherwise. Determine the total, carbonate, and noncarbonate hardness in mg/L as CaCO, using the predominant polyvalent cation definition in Section 6- 3. Answers: TH=332.8 mg/L as CaCO3 CH= 284.0 mg/L as CaCO, NCH 48.8 mg/L as CaCO, Last mo mal Jan 25

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