CA Water Treatment Plant Operator Quiz Chapter 3

50 Questions

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CA Water Treatment Plant Operator Quiz Chapter 3

Reservoir Management and Intake Structures Water Treatment Plant Operation Volume 1 Sixth Edition Please let me know if there are any issues with the quiz such as typos, wrong answers, etc. .


Questions and Answers
  • 1. 
    Methods of managing lakes and reservoirs used for domestic water supplies very widely depending on local situations.
    • A. 

      True

    • B. 

      False

  • 2. 
    Algae remove carbon dioxide from solution and convert it into cellular material as they grow.
    • A. 

      True

    • B. 

      False

  • 3. 
    Respiration by algae results in an increase in carbon dioxide in water (lowering of pH), while photosynthesis results in a decrease in water (increasing of pH)
    • A. 

      True

    • B. 

      False

  • 4. 
    Fish kills from dead algae can be the result of the algae stimulating the gills of the fish.
    • A. 

      True

    • B. 

      False

  • 5. 
    Organics released using decomposition of flooded trees and brush may contribute to increased color, chlorine demand, and trihalomethane levels following chlorination.
    • A. 

      True

    • B. 

      False

  • 6. 
    Regulated general use of pesticides and herbicides can cause serious problems of contamination in domestic water supply reservoirs.
    • A. 

      True

    • B. 

      False

  • 7. 
    Storm water runoff from highways has the potential to cause adverse impacts on reservoir water quality.
    • A. 

      True

    • B. 

      False

  • 8. 
    Alkalinity of the water is the principal factor that increases the effectiveness of copper sulfate.
    • A. 

      True

    • B. 

      False

  • 9. 
    After an algal bloom occurs, it is very easy to control the bloom and correct the bad effects on water quality.
    • A. 

      True

    • B. 

      False

  • 10. 
    Careful evaluation of reservoir monitoring must be made to determine if algae die-offs actually occur as a result of chemical application or if they simply die off due to natural circumstances.
    • A. 

      True

    • B. 

      False

  • 11. 
    With complete destratification, surface waters are warmed and deeper waters are cooled until an equilibrium is reached and the temperatures are nearly equal from top to bottom.
    • A. 

      True

    • B. 

      False

  • 12. 
    Under freezing conditions, the heaveist (most dense) water is on the bottom and is warmer than surface water.
    • A. 

      True

    • B. 

      False

  • 13. 
    Records provide the basic foundation upon which management programs are designed, implemented, and evaluated.
    • A. 

      True

    • B. 

      False

  • 14. 
    Safety hazards involved in water quality sampling may be much less than those encountered within the laboratory.
    • A. 

      True

    • B. 

      False

  • 15. 
    To obtain good water quality from a water supply reservoir, it may be necessary to draw water from different levels during different seasons of the year.
    • A. 

      True

    • B. 

      False

  • 16. 
    Intake structures andrelated facilities should be inspected, operated, and tested periodically, preferably at regular intervals.
    • A. 

      True

    • B. 

      False

  • 17. 
    What is nutrient?
    • A. 

      Any substance that is assimilated (taken in) by organisms and promotes growth

    • B. 

      That portion of a body of fresh water extending from the shoreline lakeward to the limit of occupancy of rooted plants

    • C. 

      The almost spontaneous mixing of all layers of water in a reservoir or lake

    • D. 

      The minimum odor of a water sample that can just be detected after successive dilutions with odorless water

  • 18. 
    • A. 

      Any substance that is assimilated (taken in) by organisms and promotes growth

    • B. 

      That portion of a body of fresh water extending from the shoreline lakeward to the limit of occupancy of rooted plants

    • C. 

      The almost spontaneous mixing of all layers of water in a reservoir or lake

    • D. 

      The minimum odor of a water sample that can just be detected after successive dilutions with odorless water

  • 19. 
    What are the most notable impacts on water supply reservoirs as a result of increases in organic loading caused by algal blooms?
    • A. 

      Increased color in the water supply and a major increase in chlorine demand

    • B. 

      Increase depth of the thermocline layer

    • C. 

      Increased levels of iron and manganese

    • D. 

      Increased pH in the water supply and an increase in dissolved oxygen

  • 20. 
    What causes high trihalomethane (THM) levels?
    • A. 

      Chlorination in the absence of THM precursors

    • B. 

      Chlorination of methane from anaerobic decomposition

    • C. 

      Insufficient algae present in the water supply

    • D. 

      Organic loading resulting from algal blooms and free residual chlorination

  • 21. 
    • A. 

      To eliminate or control algal blooms

    • B. 

      To eliminate or control iron, manganese, and hydrogen sulfide problems

    • C. 

      To eliminate or control nutrients

    • D. 

      To eliminate or control pH fluctuations

  • 22. 
    What is the primary purpose of any watershed management program?
    • A. 

      To collect and record changes or trends in water quality

    • B. 

      To control, minimize, or eliminate any practice within the watershed area that are harmful to water quality

    • C. 

      To enhance recreational benefits of the water supply lake or reservoir

    • D. 

      To maintain or increase property values around the lake or reservoir

  • 23. 
    • A. 

      Because algae are more susceptible to algicides at low levels of alkalinity

    • B. 

      Because copper ions react with bicarbonate and carbonate ions to form insoluble complexes that precipitate from solution

    • C. 

      Because copper sulfate costs less at low levels of alkalinity

    • D. 

      Because of the high levels of biologically active copper

  • 24. 
    Why must the operator have a reservoir monitoring program in reservoirs where algae are a potential problem?
    • A. 

      To anticipate a possible algal bloom

    • B. 

      To inform the local news media of the status of the algae

    • C. 

      To issue boil water notices

    • D. 

      To notify regulatory agencies of potential blooms

  • 25. 
    Which chemical is being considered as an alternative algicide to copper sulfate?
    • A. 

      Ammonia-based herbicides

    • B. 

      Ferric-based herbicides

    • C. 

      Hydrogen-peroxide-based herbicides

    • D. 

      Polyphosphate-based herbicides

  • 26. 
    What is destratification?
    • A. 

      The development of vertical mixing within a lake or reservoir to eliminate separate layers of temperature, plant, or animal life

    • B. 

      The introduction of air through forced air diffusers into the lower layers of the reservoir

    • C. 

      The natural process of creating supersaturated conditions in a reservoir

    • D. 

      The process of adding air to water

  • 27. 
    How is destratification accomplished?
    • A. 

      By creating circular mixing around the reservoir

    • B. 

      By encouraging winds to create horizontal mixing over the reservoir

    • C. 

      By implementing combinations of available mixing procedures

    • D. 

      By inducing vertical mixing within reservoir

  • 28. 
    • A. 

      To determine the degree of turbidity caused by the silt

    • B. 

      To estimate the potential for the growth of aquatic weeds

    • C. 

      To get an updated measure of silting as it affects available water storage

    • D. 

      To obtain information on the level of toxicity caused by the silt

  • 29. 
    What is the main safety hazard encountered during reservoir sampling?
    • A. 

      Drowning

    • B. 

      Getting wet and cold

    • C. 

      Pathogenic organisms

    • D. 

      Slips and falls

  • 30. 
    Why is it important to keep record of when and under what condition failures or malfunctions of intake facilities occur?
    • A. 

      It may be appropriate to change consultants

    • B. 

      It may be necessary to develop a new record keeping system

    • C. 

      It may be necessary to switch to another source of water

    • D. 

      It may be possible to take preventive action

  • 31. 
    Which items occuring within a reservoir's drainage area may lead to deterioration of water quality?
    • A. 

      Agricultural runoff

    • B. 

      Drainage from mining areas

    • C. 

      Grazing of livestock

    • D. 

      Industrial discharges

    • E. 

      Runoff from urban areas

  • 32. 
    • A. 

      Dissolved oxygen depletion

    • B. 

      Increased pH (which reduces chlorination efficiency)

    • C. 

      Organic loading

    • D. 

      Shortened filter runs of complete treatment plants

    • E. 

      Taste and odor problems

  • 33. 
    Reservoirs located in mountainous areas where snowmelt is the major source of runoff may experience increases in which water quality problems during snowmelt?
    • A. 

      Alkalinity

    • B. 

      Nutrient loading

    • C. 

      Organic loading

    • D. 

      Salinity

    • E. 

      Turbidity

  • 34. 
    • A. 

      Must be acceptable by the news media

    • B. 

      Must be approved by stakeholders

    • C. 

      Must be economically justifiable

    • D. 

      Must be prepared for each specific reservoir

    • E. 

      Must be technically justifiable

  • 35. 
    • A. 

      Algae control by chemical methods

    • B. 

      Development and implementation of a public relations program

    • C. 

      Direct in-line treatment of raw water

    • D. 

      Removal pf trees and brush from areas to be flooded

    • E. 

      Watershed management

  • 36. 
    During the runoff period following a wildfire, what types of pollutants may enter the reservoir?
    • A. 

      Iron and manganese

    • B. 

      Large amount of debris

    • C. 

      Lead and copper

    • D. 

      Nutrients

    • E. 

      Silt

  • 37. 
    • A. 

      A large algae die-off may occur and cause an increase in tastes and odors

    • B. 

      Fish die-offs could result from dead algal bodies clogging fish gills of from low dissolved oxygen levels

    • C. 

      Proper application of chemicals will cause unsightly algal scums, odors, and alack of water clarity

    • D. 

      Proper application of chemicals will maintain unacceptable aesthetic conditions

    • E. 

      Rate of oxygen depletion in the deeper waters will probably be increased

  • 38. 
    Which factors influence the concentration of copper sulfate needed for effective control of any particular algal bloom?
    • A. 

      Alkalinity of the water

    • B. 

      Amount of algae

    • C. 

      PH of the water

    • D. 

      Species of algae

    • E. 

      Water temperature

  • 39. 
    • A. 

      For designing new or revising existing programs

    • B. 

      For news media reports

    • C. 

      For showing compliance with federal, state, and local regulations

    • D. 

      To evaluate current and historical treatment programs

    • E. 

      To show to tour groups

  • 40. 
    • A. 

      Adequate toilet facilities and proper care of these facilities

    • B. 

      Leak proof waste containers

    • C. 

      Proper and close supervision of activities on the ice

    • D. 

      Sufficient heating facilities to keep participants warm

    • E. 

      Time limits on activities on the ice

  • 41. 
    A reservoir maintenance program should consider which items?
    • A. 

      Before draining a reservoir for maintenance, determine when, where, and how you will discharge the water in the reservoir

    • B. 

      Control shoreline vegetation such as weeds and cattails

    • C. 

      Lined reservoirs may have to be drained only during periods of low groundwater levels

    • D. 

      Lower the water level fairly slowly, because if the water level drops too quickly, the embankments may slip out and be damaged

    • E. 

      Mechanical or manual techniques can be used to remove and control vegetation

  • 42. 
    What types of laboratory analyses may best be performed for small reservoir management agency by an outside or commercial laboratory?
    • A. 

      Nutrients analyses

    • B. 

      Pesticides analyses

    • C. 

      Radioactivity analyses

    • D. 

      Toxic minerals and heavy metal analyses

    • E. 

      Trihalomethanes analyses

  • 43. 
    • A. 

      Extent of algal blooms

    • B. 

      Forecast of pathogens produced by the bloom

    • C. 

      Intensity of algal blooms

    • D. 

      Major species of algae involved in any given bloom

    • E. 

      Water quality problems that develop as a result of the bloom

  • 44. 
    • A. 

      Be alert for onshore winds

    • B. 

      Be prepared to make necessary changes in treatment plant operation to combat any sudden increases in taste and odor problems

    • C. 

      Do everything possible to keep any water with bad taste or odor that gets through the treatment plant from getting out into the distribution system

    • D. 

      Maintain a log of wind direction and velocity

    • E. 

      Maintain close surveillance of threshold odor test results

  • 45. 
    The type of screen, trash rack, or log stop used in a given intake structure depends on which factors?
    • A. 

      Depth at which the inlets are located

    • B. 

      Frequency and intensity of algal scum or algal mass accumulations

    • C. 

      Location of the intake structure in relation to where debris accumulates in the reservoir or stream

    • D. 

      Quantity and type of debris encountered

    • E. 

      Size, depth of distribution, and number of fish, crayfish, and other forms of aquatic life?

  • 46. 
    What is the surface area of a rectangular settling basin 50 feet long and 10 feet wide?
    • A. 

      400 square feet

    • B. 

      500 square feet

    • C. 

      680 square feet

    • D. 

      750 square feet

    • E. 

      900 square feet

  • 47. 
    • A. 

      1,256 square feet

    • B. 

      1,520 square feet

    • C. 

      1,963 square feet

    • D. 

      2,375 square feet

    • E. 

      2,826 square feet

  • 48. 
    • A. 

      3,200 cu ft

    • B. 

      4,000 cu ft

    • C. 

      4,800 cu ft

    • D. 

      5,300 cu ft

    • E. 

      5,800 cu ft

  • 49. 
    • A. 

      10,048 cu ft

    • B. 

      12,717 cu ft

    • C. 

      15,700 cu ft

    • D. 

      17,100 cu ft

    • E. 

      19,000 cu ft

  • 50. 
    • A. 

      300 pounds

    • B. 

      400 pounds

    • C. 

      500 pounds

    • D. 

      600 pounds

    • E. 

      700 pounds