Water License Exam Questions and Complete Solutions.

Water License Exam Questions and Complete Solutions A common chemical used in the disinfection of a small water supply is- - Answer: Calcium Hypochlorite The amount of Chlorine in mg/L that is used up by reacting with iron, organics, or bacteria is called? - Answer: Demand According to state requirements, all public water supply wells shall be provided with a raised concrete sealing block, screened vents and- - Answer: Flow measuring device One method to determine the drawdown of a water well is- - Answer: An air line Assuming you collect more than one bacteriological sample monthly and your system receives a notification from the lab that one of the samples taken in the distribution system comes back positive - your repeat sample(s) must be taken within ______ hours (excluding weekends) and a total of _____________ repeat samples must be collected for each positive? - Answer: 24 hours & 3 repeat samples for each positive Potable water means the water is- - Answer: - Maintained at adequate pressure - Pathogen free - Contains a chlorine residual (All of the above) In a ground water system if the operator knows the "standing" water level in the well when the pump is off and he/she knows the water level in the well during "pumping" - he/she will be able to determine the ______________ of the well. - Answer: Draw down TCEQ requires community water systems to have a minimum production capacity of __________ per connection at peak demand. - Answer: 0.6 gpm Which of the following is an acceptable disinfection residual at the far reaches of the distribution system- - Answer: - 0.2 mg/L free chlorine residual - 0.5 mg/L chloramine residual for a surface water supply - 0.8 mg/L chloramine residual when using chloramine treatment - 0.5 mg/L free chlorine residual for a groundwater supply (All of the above) One gallon of water weighs- - Answer: 8.34 pounds One foot of water inside a storage vessel will raise a pressure gauge at the bottom of the vessel by- - Answer: .433 lbs If and when a health hazard contamination event occurs in a public water system, the operator must contact the state regulatory authority within _______ hours by telephone. - Answer: 24 hours A physical connection between a potable water supply and a house well would be- - Answer: A Cross Connection A storage vessel that is the same diameter from the ground to the top and is more than 20 feet but less than 85 feet tall is called a- - Answer: Stand pipe According to the lead and copper rule, pipe and fittings may not contain more than ______ lead or solder and flux may not contain more than 0.2% lead. - Answer: 8.0% The most common valve used for isolating a water leak is the _________ valve. - Answer: Gate valve The most commonly used pump in the distribution system is- - Answer: Centrifugal A Texas Class D Certified Operator can operate a public water system up to _________ connections. - Answer: 250 All state of Texas Operator License's after issue are good for ________ years. - Answer: 3 years Water lines should be installed no closer than _________ feet to any sewer lines or other possible contaminate lines. - Answer: 9 feet Calcium Hypochlorite (HTH) is used as a disinfectant in small systems, what percentage chlorine is this material typically? - Answer: 65 - 75% Flushing dead-end mains - current state regulations require that all public water systems flush dead-end mains to assure chlorine residual and water quality. What is the minimum flushing requirement? - Answer: Once every month The process of adding enough chlorine to a water supply to complete all reactions with reducing compounds, ammonia, and organic materials so that some free chlorine is left is called- - Answer: Breakpoint chlorination Check valves on the discharge side of a pump are used to- - Answer: Prevent water from flowing back through the pump when the pump is off. After disinfection and flushing of super chlorinated new lines and service but prior to placing the line into service, bacteriological samples are required. The current standard is ________ sample(s) for every ________ feet of line. - Answer: One sample for every 1,000 feet of line For Cross Connection Control the TCEQ's proffered method is- - Answer: Physical air gap One microorganism found in water that is resistant to chlorine is- - Answer: Cryptosporidium An example of a Non- Community Water System would be? - Answer: - RV Park - Hotel/ Motel - Service Station (All of the above) Public water systems in Texas are required to compile and maintain reports showing- - Answer: - Pumpage & chemical used - Date of dead-end flushing & storage tanks cleaned - Microbiological tests & chemical analysis (All of the above) A source of groundwater would be- - Answer: Aquifer A disease that may be spread by inadequately disinfected water is- - Answer: Dysentery