California Water Treatment Operator Exam, Source Water: all 39 questions
All questions from the Source Water section for California Water Treatment Operator Exam, each with the correct answer.
- 1001Which source of water is generally LEAST affected by rapid changes in turbidity after a storm?
- 1002The continuous movement of water between the oceans, atmosphere and land is called the
- 1003An aquifer that is bounded above and below by layers of low permeability and is under pressure is called
- 1004The top surface of the saturated zone in an unconfined aquifer is called the
- 1005What is the static water level in a well?
- 1006A well has a static water level of 85 ft and a pumping water level of 112 ft. What is the drawdown?
- 1007A well produces 450 gpm with a drawdown of 30 ft. What is the specific capacity of the well?
- 1008The lowering of the water level around a pumping well, shaped like an inverted cone, is called the
- 1009Which part of a drilled well prevents the walls of the borehole from collapsing and keeps surface contamination out of the aquifer?
- 1010What is the purpose of the sanitary seal (annular seal) around a well casing?
- 1011Which well component is the slotted or perforated section that allows groundwater to enter while holding back sand?
- 1012Before a new or repaired well is placed in service, it is normally
- 1013Which of the following is a common sign that a well may be pumping air or sand?
- 1014A sudden increase in the drawdown of a well with no change in the pumping rate most likely indicates
- 1015Which watershed activity is the greatest threat to a surface water supply used for drinking?
- 1016A watershed sanitary survey is conducted to
- 1017Water in a deep reservoir often forms layers in summer because
- 1018Reservoir turnover in the fall or spring can cause treatment problems mainly because it
- 1019Why do many reservoir intakes have multiple withdrawal levels?
- 1020Which condition in a reservoir is most associated with taste and odor complaints in the summer?
- 1022A raw water pH of 5.8 compared with the normal range of 7.2 to 7.6 should be recognized as
- 1023Which of the following would most likely cause raw water to have a sudden, strong chemical or fuel-like odor?
- 1024Which contaminant is a microbial contaminant commonly found in surface waters affected by animal waste?
- 1025Groundwater under the direct influence of surface water is of concern because
- 1026Which chemical compounds in water are the main cause of hardness?
- 1027Which of the following is a common problem caused by hard water?
- 1028Alkalinity in natural water is mainly caused by
- 1029A water storage tank is 60 ft in diameter. How many gallons are in one foot of depth?
- 1030A rectangular basin is 40 ft long, 20 ft wide and has water 10 ft deep. How many gallons does it hold?
- 1031Which device is used to measure the flow in an open channel?
- 1032A magnetic flow meter measures flow by
- 1033Which type of flow meter creates a pressure difference across a narrowing in the pipe to calculate flow?
- 1034Water storage tanks should be disinfected after cleaning or repair mainly to
- 1035Which of the following is a recognized potential security risk at a water treatment facility?
- 1036What is pretreatment of a raw surface water supply meant to accomplish?
- 1037One acre-foot of water is equal to approximately
- 1038Water at the bottom of a storage tank 50 ft deep exerts a pressure of about
- 1039A pressure gauge on a pipe reads 52 psi. What is the equivalent head in feet?
- 1040Seasonal snowmelt in the watershed usually causes the raw water to