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Water hardness in a reservoir is measured as 14.5 grains per US gallon14.5 \text{ grains per US gallon}14.5 grains per US gallon of calcium carbonate. Convert this hardness level to milligrams per liter (mg/L\text{mg/L}mg/L). (Take 1 grain≈64.7989 mg1 \text{ grain} \approx 64.7989 \text{ mg}1 grain≈64.7989 mg and 1 US gallon≈3.78541 liters1 \text{ US gallon} \approx 3.78541 \text{ liters}1 US gallon≈3.78541 liters)