NM Water Level 4 exam #2 Practice test 90
QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES (VERIFIED
ANSWERS) ALREADY GRADED A+ 2025 NEW
UPDATE
A 10 MG D, conventional water treatment plant, obtains its water from a reservoir,
continuous raw water pH monitoring indicates that the pH rises throughout the daylight
hours and drops during the night. What condition is indicated by this information? -
CORRECT ANSWER: An impending tased an order problem
A 12 inch pipe carrying a flow of 1200 GPM feeds into a 6 inch pipe. If the velocity of the
water in the 12 inch pipe is 3.4 ft./s. What will the velocity of the water in the 6 inch pipe
be? - CORRECT ANSWER: 13.6
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 many cubic yards of bedding
sand will be required to provide sand encasement around the pipe for a total depth of
24" inches , assuming 12" inches of bedding is to be replaced below the pipe? -
CORRECT ANSWER: 135 cubic yards
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? - CORRECT ANSWER: 8.3
A solid contact basin combines which of the following processes? - CORRECT
ANSWER: Coagulation, flocculation and sedimentation
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? - CORRECT ANSWER:
Contamination
, A water system serving 14,000 people has a service water treatment plant that includes
it's conventional treatment. Coagulation, sedimentation, filtration and chlorine
disinfection under the capital, NM utility operators certification regulations. What level of
operator must be placed in charge of the system? - CORRECT ANSWER: Level lV (4)
According to the New Mexico drinking water regulations. How often must a groundwater
system be sampled for inorganic chemical contaminants such as Selenium ,Mercury
and Cyanide ? - CORRECT ANSWER: 3 years
According to the NM drinking water regulations, what is the maximum number of hours
allowed between a collection of a distribution system sampling and analysis for total
coliforms? - CORRECT ANSWER: 30hrs
According to the US EPA safe drinking water act regulations. What is the basis for the
number of monthly samples you must collect for BAC-T test? - CORRECT ANSWER:
The population served
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 ? - CORRECT ANSWER: 117 ft
An operator has discovered that a log has been cut from the hatch of a distribution
system storage tank. Until the incident is confirmed, treat this type of security breach
as? - CORRECT ANSWER: A potential contamination threat
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 ? - CORRECT ANSWER: 2 Days
Chlorine reacts with water to form what? - CORRECT ANSWER: Hydrochloric acid and
hypochlorous acid
QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES (VERIFIED
ANSWERS) ALREADY GRADED A+ 2025 NEW
UPDATE
A 10 MG D, conventional water treatment plant, obtains its water from a reservoir,
continuous raw water pH monitoring indicates that the pH rises throughout the daylight
hours and drops during the night. What condition is indicated by this information? -
CORRECT ANSWER: An impending tased an order problem
A 12 inch pipe carrying a flow of 1200 GPM feeds into a 6 inch pipe. If the velocity of the
water in the 12 inch pipe is 3.4 ft./s. What will the velocity of the water in the 6 inch pipe
be? - CORRECT ANSWER: 13.6
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 many cubic yards of bedding
sand will be required to provide sand encasement around the pipe for a total depth of
24" inches , assuming 12" inches of bedding is to be replaced below the pipe? -
CORRECT ANSWER: 135 cubic yards
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? - CORRECT ANSWER: 8.3
A solid contact basin combines which of the following processes? - CORRECT
ANSWER: Coagulation, flocculation and sedimentation
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? - CORRECT ANSWER:
Contamination
, A water system serving 14,000 people has a service water treatment plant that includes
it's conventional treatment. Coagulation, sedimentation, filtration and chlorine
disinfection under the capital, NM utility operators certification regulations. What level of
operator must be placed in charge of the system? - CORRECT ANSWER: Level lV (4)
According to the New Mexico drinking water regulations. How often must a groundwater
system be sampled for inorganic chemical contaminants such as Selenium ,Mercury
and Cyanide ? - CORRECT ANSWER: 3 years
According to the NM drinking water regulations, what is the maximum number of hours
allowed between a collection of a distribution system sampling and analysis for total
coliforms? - CORRECT ANSWER: 30hrs
According to the US EPA safe drinking water act regulations. What is the basis for the
number of monthly samples you must collect for BAC-T test? - CORRECT ANSWER:
The population served
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 ? - CORRECT ANSWER: 117 ft
An operator has discovered that a log has been cut from the hatch of a distribution
system storage tank. Until the incident is confirmed, treat this type of security breach
as? - CORRECT ANSWER: A potential contamination threat
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 ? - CORRECT ANSWER: 2 Days
Chlorine reacts with water to form what? - CORRECT ANSWER: Hydrochloric acid and
hypochlorous acid
