Integra Study Aid for Small Water Systems - Florida Rural Water ...

General Water TreatmentG1. A sounding tubeAllows air to enter well during drawdown to prevent vacuum conditions.Vents excess air during well recovery period.Permits operator to see level of gravel and add gravel as necessary.*Permits insertion of water level measuring device. Also used to add chlorine or well cleaningagents.Permits measurement of water level by means of air pressure measurements.G2. A well casingSupports the weight of the pumping unit.Provides watertight seal between the motor base and the concrete support pedestal.Permits sampling of pumped water.*Permits discharge of air in column pipe during start-up and admits air during shutdown.Used to remove first water (usually sandy) pumped at start-up.G3. Source waters include these two broad categories*Surface water and ground waterReservoirs and wellsReservoirs and ground waterFlowing water and stagnant waterG4. "Uniformity coefficient" refers to:Uniform floc formationRunning the test the same way each timeQuality of wastewater*Measure of uniformity of filter mediaG5. What conditions determine the backwash rate for a pressure filter?*Largest media sizeQuality of the backwash waterSettleability of solids in the secondary clarifierSuspended solids concentrations in the water applied to the filterG6. If your finished water turbidity changed from 0.2 NTU to 0.8 NTU and you do not want tochange the pH, what chemical would you use?AlumFerric chloride*PolymerSodium aluminateG7. The precipitate formed by coagulation with alum is aluminum ________.BicarbonateCarbonate*HydroxideSulfateG8. The correct amount of chemical used to remove turbidity is known as the:Coagulation range