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8. You are an engineer who is conducting a water quality assessment on a surface water. You have obtained the following data for some of the chemical characteristics of the water: a. What is the total hardness of this water in mg/L as CaCO3 ? b. You are using aluminum sulfate (in natural alkaline water) as a coagulant. How much alum do you need to add for effective coagulation (in mg/L )? c. How much calcium sulfate are you producing with this coagulant dose? d. Based on this dose of coagulant, and assuming you are adding this as Al2SO414H2O, is this water at the optimal dose and pH for sweep coagulation to occur? Provide a 1 sentence explanation