NM Water Level 4 exam #2 questions
and answers with solutions 2025/2026
In a water plant that uses Coagulation, Sedimentation, and Filtration to
treat the water. Which of the following Chlorine application points
would you have the lowest potential for generating THM's? - ANSWER In
the finished water clear well
You recently heard an operator explaining that the under drains at the
treatment plant were not working. What treatment unit was the
operator talking about? - ANSWER Gravity Filter
Calculate the average detention time in a rectangular basin that is 90ft
long by 40ft long of water depth of 15ft . When the flow rate is 2 MGD ?
- ANSWER 2 Days
A new 10"in water main 2640 ft long is to be disinfected by applying 60
mg/l of Chlorine and allowing it to stand for 24 hours. How many pounds
of dry hypochlorite 65% chlorine will be needed? - ANSWER 8.3
When you are using a non exchanged softening such as Zeolite are
known as? - ANSWER Resins
What is the acceptable range of accuracy for small residential water
meters? - ANSWER 98.5% to 101%
, What does the term GAC refer to? - ANSWER Granulated Active Carbon
What is indicated by the presence of fecal coliform or non coliform in a
water sample? - ANSWER Contamination by animals or humans
How does organic matter increase the chlorine demand? - ANSWER It
combines with chlorine to form less affective disinfectants
A water main break has lowered the water pressure in a section of the
distribution system. What is one possible result of this low pressure? -
ANSWER Contamination
An airline 200ft long is situated inside a well for determining the water
level. Air is pumped into the airline and the pressure gauge is stabilized
at 36 psi. What is the water level in the well in feet ? - ANSWER 117 ft
Coliform bacteria must be tested for in accordance with the NMED
drinking water regulations. What are coliform bacteria? - ANSWER
Indicator Organisms
What affect will the addiction of chlorine gas have on the PH of the
water ? - ANSWER Lower
A near 1000ft long ___ inch diameter PVC pipeline is to be installed in a
rocky area. A 24" in wide trench was excavated to a depth of 4ft. How
and answers with solutions 2025/2026
In a water plant that uses Coagulation, Sedimentation, and Filtration to
treat the water. Which of the following Chlorine application points
would you have the lowest potential for generating THM's? - ANSWER In
the finished water clear well
You recently heard an operator explaining that the under drains at the
treatment plant were not working. What treatment unit was the
operator talking about? - ANSWER Gravity Filter
Calculate the average detention time in a rectangular basin that is 90ft
long by 40ft long of water depth of 15ft . When the flow rate is 2 MGD ?
- ANSWER 2 Days
A new 10"in water main 2640 ft long is to be disinfected by applying 60
mg/l of Chlorine and allowing it to stand for 24 hours. How many pounds
of dry hypochlorite 65% chlorine will be needed? - ANSWER 8.3
When you are using a non exchanged softening such as Zeolite are
known as? - ANSWER Resins
What is the acceptable range of accuracy for small residential water
meters? - ANSWER 98.5% to 101%
, What does the term GAC refer to? - ANSWER Granulated Active Carbon
What is indicated by the presence of fecal coliform or non coliform in a
water sample? - ANSWER Contamination by animals or humans
How does organic matter increase the chlorine demand? - ANSWER It
combines with chlorine to form less affective disinfectants
A water main break has lowered the water pressure in a section of the
distribution system. What is one possible result of this low pressure? -
ANSWER Contamination
An airline 200ft long is situated inside a well for determining the water
level. Air is pumped into the airline and the pressure gauge is stabilized
at 36 psi. What is the water level in the well in feet ? - ANSWER 117 ft
Coliform bacteria must be tested for in accordance with the NMED
drinking water regulations. What are coliform bacteria? - ANSWER
Indicator Organisms
What affect will the addiction of chlorine gas have on the PH of the
water ? - ANSWER Lower
A near 1000ft long ___ inch diameter PVC pipeline is to be installed in a
rocky area. A 24" in wide trench was excavated to a depth of 4ft. How
