Class D Water Exam Illinois| Already Passed A+

Class D Water Exam Illinois| Already Passed A+ For a water storage tank, cathodic protection is only effective for the: tank areas covered by water For a water storage system, the purpose of an altitude valve is to prevent: overflows Before using a water storage tank that has been disinfected, water from the tank must not show the presense of: coliforms High trihalomethane (THMs) levels may cause: cancer A finished water with a negative Langelier Index may be: corrosive Water with pH scale less than 7 is considered: acidic pH scale of 7 is considered neutral pH scale of 8-14 is considered? basic How many gallons of water are in 1 cubic ft? 7.48 gallons How many gallons of water are in 15 cubic ft? 15 x 7.48 = 112.2 gallons How many cubic ft of water is 20 gallons?