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50 Cards in this Set
- Front
- Back
The pumping water level is best defined as the distance from the top of the well to the
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Water after the pump has been operating for a period of time
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When bringing community water service to a home with a private well, what is the most positive method of preventing a cross connection between two systems
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Complete isolation between the two systems using an air gap
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Chlorine will destroy bacteria most rapidly at which pH?
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7
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How many pounds of a chemical applied at the rate of 3mg/L are required to dose 200,000 gallons?
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5 lbs
Solution: 3mg/L x 02.MGD x 8.34lbs/gal=5 lbs |
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Which document provides a profile of hazardous substances?
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MSDS
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What federal law is designed to protect the safety and health of operators?
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OSHA
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A mixture of air and gas is considered hazardous when the mixture exceeds what percentage of the lower explosive limit (LEL)?
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10%
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What safety measure must an operator follow prior to working on electrical equipment?
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Lock out and tag out all electrical switches.
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What is the correct procedure for mixing acid and water?
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Acid is added slowly to the water
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Unless the state has granted a waiver, how many coliform samples are required per month for a water system serving a population between 25 and 100?
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1
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Calculate drawdown, in feet, using the following data.
-The water level in a well is 20 feet below the ground surface when the pump is not in operation. -The water level is 35 feet below the ground surface when the pump is in operation |
15 feet
Solution: 35 feet- 20 feet= 15 feet |
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What device measures the flow rate of gases or liquids?
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Rotameter
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How often should operation data, such as flow rate, amount of water treated, dosage of chemical, and reservoir levels be recorded?
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Daily
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What safety procedure should an operator always follow when mixing a solution of sodium hypochlorite (liquid bleach) and fresh water?
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Wear goggles and gloves when handling hypochlorite
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What is the process of adding chlorine to water until the chlorine demand has been satisfied called?
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Breakpoint chlorination
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Which of the following terms refers to excessive internal pressure, which may be several times the normal operating pressure and can seriously damage hydropneumatic tanks,valves, and the piping network?
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Water Hammer
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Chlorine demand is satisfied at the point when
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The reaction of chlorine with organic and inorganic materials stops
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What type of fire extinguisher should be used for fires with live electricity present?
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Class C
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What source of water has the greatest natural protection from bacterial contamination?
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Deep well in gravel
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What causes water to move through pores in soil and rocks?
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Gravity
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According to the Safe Drinking Water Act, the basic definition of a public water supply system is any water system that supplies water for human consumption that serves at least
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15 service connections or 25 or more persons for 60 or more days a year.
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What agent is responsible for reporting laboratory results to the regulatory agency?
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Water system owner
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When should water quality samples for chlorine residual be analyzed?
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Immediately
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Which of the following should not be used to draw a sample into a pipet?
Mouth Bulb Pump Straw |
Mouth
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What term is used when a water utility divides its total operating expenses into the total revenue?
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Operating ratio
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the major source of error when obtaining water quality information is improper
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Sampling
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The most important responsibility of an operator is to provide
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Safe drinking water
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Calculate the average weekly flow for a system with the following data.
Sunday - 3,000 gallons Monday- 4,000 gallons Tuesday- 3,500 gallons Wednesday- 2,000 gallons Thursday- 3,000 gallons Friday- 3,500 gallons Saturday- 2,000 gallons |
3,000 gpd
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a ditch that is 4.5 feet wide, 6 feet deep, and 120 feet long has to be dug for a water line. How many cubic yards of material must be removed?
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120 cubic yards
Solution: convert feet to yards, then multiply the 3 figures. |
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Which of the following causes taste problems and has a rotten egg odor?
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Hydrogen sulfide
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Which of the following should an operator investigate first when well pump and control problems occur?
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Electricity
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Calculate the volume, in gallons, of a tank that is 75 feet long, 20 feet wide, and 10 feet deep.
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112,200 gallons
Solution= 75ft x 20ft x 10 ft= 15,000 cu ft 15,000 cu ft x 7.48gal/cu ft= 112,200gal. |
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Dynamic head is best described as the
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Total energy that a pump must develop for pumping to take place
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How often should preventive maintenance for equipment be performed?
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According to manufacturer recommendations
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What is the most important reason for maintaining a continuous positive pressure throughout the distribution system?
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Prevent contamination from backflow
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After a new water main is installed and pressure tested it should be
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Filled with a solution of 25ppm to 50ppm free chlorine for at least 24 hours prior to flushing
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Which of the following is the most important reason to keep daily records of operational data?
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Document the safe drinking water has been delivered to customers
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What are the two main causes of hardness in water?
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Calcium and magnesium
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Most pumps must be primed before startup in order to
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Start the flow of water
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Which of the following are two types of samples?
Dessicator and gooch Wet and dry Buret and flask Grab and composite |
Grab and composite
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What test method best determines chemical feed/dosage rates
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Jar
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How should samples that cannot be analyzed immediately be maintained until the analysis is conducted?
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Preserved
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What are the two most important safety concerns when entering a confined space?
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Oxygen deficiency and hazardous gases
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Two columns of water are filled completely at sea level to a height of 88 feet. Column A is 0.5 inches in diameter. Column B is 5 inches in diameter. What will two pressure gauges, one attached to the bottom of each column, read?
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Column A= 38.1 psi
Column B= 38.1psi Solution: 88 feet x 0.433= approximately 38.1 psi |
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Calculate the chlorine demand using the following data.
-Raw water flow is 0.75 MGD -Chlorinator feed rate is 4.0 mg/L -Chlorine residual is 1.8 mg/L |
2.2mg/L
Solution: 4.0mg/L- 1.8mg/L=2.2mg/L |
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To ensure that the water supplied by a public water system meets federal and state requirements, the water system operator must regularly collect samples and
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Send all analyses results to the State periodically
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What is the purpose of a check valve?
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Act as automatic shutoff valve when the pump stops
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What federal law regulated public water supplies?
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Safe Drinking Water Act
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If a customer complains about the drinking water characteristics, the operator should record the complaint and
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Investigate immediately
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According to the USEPA drinking water regulations, failure of a public water system to comply with applicable monitoring requirements and subject to Tier 3 public notice requires notifications to all customers within
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1 year
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