WATER TREATMENT CLASS E EXAM STUDY GUIDE QUESTIONS
WITH COMPLETE SOLUTIONS
1) What is the purpose of The Safe Drinking Water Act? -- Answer ✔✔ to protect the
public from waterborne diseases
2) Name some waterborne diseases -- Answer ✔✔ Hepatitis, Anthrax, Dysentery,
Cholera, typhoid fever, giardiasis, gastroenteritis, meningitis, polio
3) when working around electrical equipment, strictly observe all applicable rules of the
__________. -- Answer ✔✔ National Electric Safety Codes.
4) A new tank should be disinfected for ___________ before a water sample is
collected for coliform analysis -- Answer ✔✔ 24 hours
5) When a new well is completed, it is necessary to disinfect the well, pump, and
screen; a _________ residual of free chlorine is recommended -- Answer ✔✔ 50
mg/L (or ppm)
6) What are the potential consequences of excessive water draw from an aquifer? --
Answer ✔✔ Water Quality can be impacted through excessive sea water infiltration
or excessive iron and manganese .
,7) Describe an unconfined aquifer. -- Answer ✔✔ Also known as a water-table aquifer,
these aquifers' water tables can rise and fall, wells in these aquifers are prone to
change in flow rate.
8) describe a confined aquifer. -- Answer ✔✔ Also known as an artesian aquifers, these
have an impermeable/ semi impermeable layer above the aquifer and are recharged
from above. These are under pressure and when the water table intersects the
surface they are considered springs.
9) what is the purpose of a watershed sanitary survey? -- Answer ✔✔ To assess the
adequacy of supply and potential for contamination. they may also suggest protection
strategies.
10) What two conditions must be considered when choosing the depth of a
lake/reservoir's (impoundment's) intake? -- Answer ✔✔ The Trophic cycle and the
Thermal stratification of an impoundment.
11) Describe the trophic levels -- Answer ✔✔ 3 levels of lake nutrients/biological
activity, starting from lowest to highest in both aspects, these stages are the
oligotrophic, mesotrophic and eutrophic stage. the eutrophic stage is associated with
low oxygen, high turbidity and color and NOM. low oxygen can cause iron and
manganese deposits to become soluble ions.
12) describe thermal stratification -- Answer ✔✔ differences in water temperature
causes layers of water, also known as limnion, which can cause oxygen depletion and
also "lake turnover", a phenomenon where cooler surface level water sinks to the
bottom of a lake and riles up the sediment at the bottom, reducing water quality.
, 13) Watershed -- Answer ✔✔ The land area who's runoff supplies water to a water
source.
14) list the water quality issues that may result from changes in source water quality --
Answer ✔✔ Bacteriological: fecal contamination
Biological: zebra mussels, algae
Chemical: radioactive substances, spills
Physical: Temperature, pH
Agricultural: pesticides, fertilizer
Groundwater conditions: wellhead contamination
Lake stratification: taste and odor, iron or manganese
15) At what depth is shoring required when trenching in soil? -- Answer ✔✔ 5 feet or
deeper
shoring is protective system used when trenching in soil. it is not required in stable
rock.
16) at what depth is access/egress equipment like a ladder necessary? -- Answer ✔✔ 4
feet (must be located within 25 ft of all workers and extend 3 feet higher than the
trench top
17) which of the following is a positive displacement meter?
A) Venturi meter
B) Turbine meter
WITH COMPLETE SOLUTIONS
1) What is the purpose of The Safe Drinking Water Act? -- Answer ✔✔ to protect the
public from waterborne diseases
2) Name some waterborne diseases -- Answer ✔✔ Hepatitis, Anthrax, Dysentery,
Cholera, typhoid fever, giardiasis, gastroenteritis, meningitis, polio
3) when working around electrical equipment, strictly observe all applicable rules of the
__________. -- Answer ✔✔ National Electric Safety Codes.
4) A new tank should be disinfected for ___________ before a water sample is
collected for coliform analysis -- Answer ✔✔ 24 hours
5) When a new well is completed, it is necessary to disinfect the well, pump, and
screen; a _________ residual of free chlorine is recommended -- Answer ✔✔ 50
mg/L (or ppm)
6) What are the potential consequences of excessive water draw from an aquifer? --
Answer ✔✔ Water Quality can be impacted through excessive sea water infiltration
or excessive iron and manganese .
,7) Describe an unconfined aquifer. -- Answer ✔✔ Also known as a water-table aquifer,
these aquifers' water tables can rise and fall, wells in these aquifers are prone to
change in flow rate.
8) describe a confined aquifer. -- Answer ✔✔ Also known as an artesian aquifers, these
have an impermeable/ semi impermeable layer above the aquifer and are recharged
from above. These are under pressure and when the water table intersects the
surface they are considered springs.
9) what is the purpose of a watershed sanitary survey? -- Answer ✔✔ To assess the
adequacy of supply and potential for contamination. they may also suggest protection
strategies.
10) What two conditions must be considered when choosing the depth of a
lake/reservoir's (impoundment's) intake? -- Answer ✔✔ The Trophic cycle and the
Thermal stratification of an impoundment.
11) Describe the trophic levels -- Answer ✔✔ 3 levels of lake nutrients/biological
activity, starting from lowest to highest in both aspects, these stages are the
oligotrophic, mesotrophic and eutrophic stage. the eutrophic stage is associated with
low oxygen, high turbidity and color and NOM. low oxygen can cause iron and
manganese deposits to become soluble ions.
12) describe thermal stratification -- Answer ✔✔ differences in water temperature
causes layers of water, also known as limnion, which can cause oxygen depletion and
also "lake turnover", a phenomenon where cooler surface level water sinks to the
bottom of a lake and riles up the sediment at the bottom, reducing water quality.
, 13) Watershed -- Answer ✔✔ The land area who's runoff supplies water to a water
source.
14) list the water quality issues that may result from changes in source water quality --
Answer ✔✔ Bacteriological: fecal contamination
Biological: zebra mussels, algae
Chemical: radioactive substances, spills
Physical: Temperature, pH
Agricultural: pesticides, fertilizer
Groundwater conditions: wellhead contamination
Lake stratification: taste and odor, iron or manganese
15) At what depth is shoring required when trenching in soil? -- Answer ✔✔ 5 feet or
deeper
shoring is protective system used when trenching in soil. it is not required in stable
rock.
16) at what depth is access/egress equipment like a ladder necessary? -- Answer ✔✔ 4
feet (must be located within 25 ft of all workers and extend 3 feet higher than the
trench top
17) which of the following is a positive displacement meter?
A) Venturi meter
B) Turbine meter
