Water Operator Class C Questions and
Complete Solutions Graded A+
Texas Commission on Environmental Services - Answer: The state agency charged with the regulation of
public water supplies in Texas
50 ft - Answer: No ground water well shall be located within_____feet of tile or concrete sewage line,
septic tank, storm sewer or cemetery.
Sand - Answer: Well screens are installed in the well development process and keep _____ from
entering the pump
Aeration removes gases as - Answer: Methane, Hydrogen Sulfide, Carbon Dioxide and Randon
Scale on the inside of water pipes is primarily cause by - Answer: Sulfides
In the far reaches of the Distribution System there must be a minimum free chlorine residual of -
Answer: 0.2mg/L or 0.5mg/L Choramines
0.8 mg/L - Answer: The maximum residual level for Chlorine Dioxide
Squirrel Cage Induction Motor - Answer: Most electric motors that you come in contact with
Submersible pump - Answer: A pump and motor combination that is found at the bottom of a well and
pushes the water to the surface
Cryptosporidium,Giardia - Answer: Some waterborne Protozoa that are very resistant to common
chlorine dosages
Well construction companies use the well casing to - Answer: Keep the bore hole open and prevent
contamination
, Calcium and Magnesium - Answer: The measurement of total hardness
50 ft - Answer: Minimum required distance between a public water supply well and a concrete sewer
line
Iron and Manganese - Answer: Contaminants often responsible for taste and odor complaints in
groundwater systems
Possible Fecal contamination exists - Answer: When a community water system receives notice from the
lab that the water tested positive for total coliform bacteria
0.8 mg/L - Answer: Maximum residual level for Chlorine Dioxide
Pressurized Cement - Answer: The annular space between the well casing and bore line hole, from
ground level to the static water level
Centrifugal pump - Answer: Most common type of pump used by wate systems to maintain pressure
and move the water
Demand - Answer: The amount of chlorine used to react with bacteria, viruses and reducing compounds
Calcium carbonate - Answer: Generally cause a scale layer formed on the inside of a system piping and
components
The function is a well screen - Answer: Keep sand and gravel from enter the well while letting water pass
thru
Calcium and Magnesium - Answer: Minerals that cause water hardness
Demand - Answer: The amount of chlorine in mg/L that is used up by reacting with iron, organics, or
bacteria
Complete Solutions Graded A+
Texas Commission on Environmental Services - Answer: The state agency charged with the regulation of
public water supplies in Texas
50 ft - Answer: No ground water well shall be located within_____feet of tile or concrete sewage line,
septic tank, storm sewer or cemetery.
Sand - Answer: Well screens are installed in the well development process and keep _____ from
entering the pump
Aeration removes gases as - Answer: Methane, Hydrogen Sulfide, Carbon Dioxide and Randon
Scale on the inside of water pipes is primarily cause by - Answer: Sulfides
In the far reaches of the Distribution System there must be a minimum free chlorine residual of -
Answer: 0.2mg/L or 0.5mg/L Choramines
0.8 mg/L - Answer: The maximum residual level for Chlorine Dioxide
Squirrel Cage Induction Motor - Answer: Most electric motors that you come in contact with
Submersible pump - Answer: A pump and motor combination that is found at the bottom of a well and
pushes the water to the surface
Cryptosporidium,Giardia - Answer: Some waterborne Protozoa that are very resistant to common
chlorine dosages
Well construction companies use the well casing to - Answer: Keep the bore hole open and prevent
contamination
, Calcium and Magnesium - Answer: The measurement of total hardness
50 ft - Answer: Minimum required distance between a public water supply well and a concrete sewer
line
Iron and Manganese - Answer: Contaminants often responsible for taste and odor complaints in
groundwater systems
Possible Fecal contamination exists - Answer: When a community water system receives notice from the
lab that the water tested positive for total coliform bacteria
0.8 mg/L - Answer: Maximum residual level for Chlorine Dioxide
Pressurized Cement - Answer: The annular space between the well casing and bore line hole, from
ground level to the static water level
Centrifugal pump - Answer: Most common type of pump used by wate systems to maintain pressure
and move the water
Demand - Answer: The amount of chlorine used to react with bacteria, viruses and reducing compounds
Calcium carbonate - Answer: Generally cause a scale layer formed on the inside of a system piping and
components
The function is a well screen - Answer: Keep sand and gravel from enter the well while letting water pass
thru
Calcium and Magnesium - Answer: Minerals that cause water hardness
Demand - Answer: The amount of chlorine in mg/L that is used up by reacting with iron, organics, or
bacteria
