Water Distribution Level 2 Exam Questions and Answers, Exams of Water Resources Planning and Management

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Water Distribution Level 2 Exam

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What do water distribution system operators have the responsibility for? - ANSWER- The health and well-being of the community they serve Frequently the water supplier tries to maintain specific minimum target __________________ throughput the distribution system. - ANSWER-Water pressure (20 PSI minimum) All trenches and excavations are unsafe until... - ANSWER-Proper shoring, used, and back filled Can the quality of water coming out of the consumers tap can be affected by what happens to the water as it travels through the consumers own system? - ANSWER-Yes Biofilms will grow more easily on materials that supply... - ANSWER-Nutrients Operators should be required to follow a prepared _________ schedule and document the work they do - ANSWER-PM (preventative maintenance) A lack of chlorine residual in a distribution system could indicate? - ANSWER-The presence of heavy contamination What is necessary to do when a new well, pump, or screen is completed - ANSWER- Disinfect The chlorine injection should never be due to causing corrosion problems - ANSWER- On the intake side of the pump What must be done before excavation can begin? - ANSWER-Location of underground installations (811 locates) When must a confined space permit be renewed? - ANSWER-each time someone leaves and re-enters the confined space What does nearly every area of a managers responsibilities require? - ANSWER-Some type of planning The sooner you deal with a disciple problem... - ANSWER-The better the outcome will be.

Who is responsible for peeve contamination of the public water system by backflow? - ANSWER-The water supplier A supervisor neglecting the safety hazards could be... - ANSWER-Fined, sentenced to jail, barred from working What is the operators most important responsibility with regards to safety? - ANSWER- Following safety procedures What is the main purpose of a water storage facility? - ANSWER-To provide a sufficient amount of water to average or equalize the daily demands What is the purpose of surge tanks? - ANSWER-To control water hammer Why should all storage facilities be sampled regular? - ANSWER-To determine the quality or the water that enters and leaves the facility? Why is backflow a concern for water distribution system operators? - ANSWER-Flow from non potable source could contaminate distribution system Why can air because a problem in a water main? - ANSWER-Air can collect and stop the flow of water completely What is a cross-connection? - ANSWER-Unprotected connection between a drinking water supply and a system NOT approved as safe. What is back pressure? - ANSWER-Backflow caused when the users water system pressure is higher than the public system Which type of corrosion-control inhibitor may stimulate bacterial growth? - ANSWER- Phosphate-based product What is the main objective of distribution system maintenance? - ANSWER-Provide maximum continuous equipment service at the lowest possible cost. What should be done immediately if there is any evidence that distribution system has been tampered with by vandals or terrorists? - ANSWER-Take facility out of service What is an air gap separation device? - ANSWER-A vertical empty space that separates a drinking wanted supply from an unapproved water system What information is available from a geographic information system (GIS) computer program? - ANSWER-Map with detailed information about the physical structures within geographic areas.

What is disinfection? - ANSWER-Selective destruction or inactivation of pathogenic organisms What happens when chlorine is added to water and the reaction of chlorine with organic and inorganic materials stops? - ANSWER-Chlorine demand has been satisfied What is the chlorine dose? - ANSWER-Chlorine demand plus chlorine residual What is the one objective of a safety program? - ANSWER-To prevent accidents What should an operator do if the operator can not remove a safety hazard? - ANSWER-Call hazard to attention of those who have authority to remove hazard What is the basic requirement for an enclosed guard? - ANSWER-Prevent hands and arms from making contact with dangerous moving parts In water distribution systems what is the primary concern when entering a confined space? - ANSWER-oxygen deficiency What is the meaning of accountability - ANSWER-When an operator ensures that the manager is informed of results or events The selection method and examination process used to evaluate applicants must be limited to which areas? - ANSWER-Applicants knowledge, skills, and abilities to preform job-related activities What is the purpose of a distribution system O & M program? - ANSWER-To ensure that the system performs as designed and intended If contamination of a water supply is discovered, what is the most important immediate concern? - ANSWER-Safety of the public What are the responsibilities of water distribution system operators? - ANSWER--deliver safe pleasant drinking water

• make sure adequate amount of water and pressure are available during emergencies Why does surface water require treatment? - ANSWER--To remove,kill, or inactivate diease causing organisms -to remove suspended and dissolved materials Which factors influence reserve storage requirements? - ANSWER-Alternative water supply Fire insurance regulations Future growth and development demand Standby requirements

Which items are abnormal operating conditions? - ANSWER-Broken or out of service pumps Excessive water demands Stale water in tanks Which of the following items are possible causes of rates and odors in storage tanks and distribution systems? - ANSWER-Algal growth Dead ends High chlorine residual What causes water hammer - ANSWER-Operating valves to quickly Rapid increase or decrease in water flow Turning pumps on and off Which factors influence distribution system preformance - ANSWER-Demands of water Fire Potential service interruption Protection against unauthorized entry Quality of the water supply Why are thrust blocks installed - ANSWER-To prevent leakage To prevent separation of joints What is the most positive type of backflow prevention available? - ANSWER-Air gap devices When is a domestic water supply consider led to be of good quality? - ANSWER- Attractive taste and appearance Distributed without undue corrosiveness Cree of disease Free of toxic chemicals What of the following inorganic substances can be found in water? - ANSWER-Arsenic, lead, mercury, nitrate Which of the following factors may cause water quality degradation in water distribution systems? - ANSWER-Biological growth Corrosion Cross connections Dead ends Operational procedures Which items should be part of a daily inspection of a storage reservoir? - ANSWER- Change water appearance Evidence water has been tampered Fence openings

Roof damage Screen openings Which of the following are purposes of water quality monitoring - ANSWER-Answer consumers questions Assistant in determining source of contamination Comply with requirements of regulations Provide a record of the quality of water Verify or refute claims Which of the following backflow prevention devices are approved for use at service connections? - ANSWER-Air gap separation Double check valve Reduces pressure principle device Which factors can cause a loss of water carrying capacity - ANSWER-Corrosion Deposition of sediment Putting Slime growth Tuberculation When does a field disinfection of distribution system mains and storage reservoirs become necessary - ANSWER-After repairs are made When they are new Whenever there is any possible of contamination Which of the following factors influence disinfection? - ANSWER-Organic matter PH Temperature Turbidity Which types of disinfectants are used to disinfect water that is delivered to consumers - ANSWER-Free chlorine Monochloramine