WATER TREATMENT GRADE 2 NEWEST 2025 ACTUAL
EXAM COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY
GRADED A+||BRAND NEW!!
Water being served to the public for a propulation greater than 3,300 must not
have a disinfectant residual entering the distribution system below ____________
for more than 4 hours - (ANSWER)0.2 mg/L
What is the action level for copper? - (ANSWER)1.3 mg/L
Where are the sampling points located for required sampling of coliform bacteria
in a community water system? - (ANSWER)At points where water enters the
distribution system, including all filter effluents of surface water treatment plant
Under the Surface Water Treatment Rule, disinfection residuals must be collected
at the same location in the distribution system as? - (ANSWER)coliform samples
What I the MCL for haloacetic acids (HAA5)? - (ANSWER)0.060 mg/L
An example of _______ is determining the lowest monthly average during 12
month monitoring of Giardia and virus inactivation - (ANSWER)benchmarking
,What is the MCLG for substances that are suspected carcinogens? -
(ANSWER)zero
Which regulation is designed to limit huma exposure to harmful organisms,
including Cryptosporidium, by promoting achievement of particle and turbidity
removal targets for surface water treatment systems? - (ANSWER)IESWTR
Which regulation is designed to limit human exposure to fecal contamination that
may be present in public water systems that use ground water sources? -
(ANSWER)GWR
Which regulation is designed to promote routine surveillance of distribution
system water quality to search for contamination from fecal matter and/or
disease-causing bacteria? - (ANSWER)TCR
what is the optmal pH range for the removal of particulate matter whe using alum
as a coagulant? - (ANSWER)6.5-7.2
which forces will pull particles together once they have been destabilized in the
coagulation-flocculation process? - (ANSWER)van der Waals forces
Which of the following is a common mistake that operators make in regard to
flocculation units? - (ANSWER)Allowing excessive flocculation time
,Ferric sulfate has which advantage over aluminum sulfate (alum)? -
(ANSWER)more dense floc
The lower the _________ the more difficult it is to form a proper floc. -
(ANSWER)turbidity
Jar test results are expressed in - (ANSWER)milligrams per liter
List four characteristics of raw water that must be considered in selecting a
treatment chemical? - (ANSWER)any four of the following: type and concentration
of contaminants, temperature, alkalinity, pH, turbidity, color, total organic carbon
Raw water temperature that approaches the freezing t has what effect on
coagulation and flocculation process? - (ANSWER)as the water temperature
decreases the viscosity of the water increases, which slows the rate of floc settling
How much time is required to develop heavy floc particles during the flocculation
process? - (ANSWER)30 minutes
if enteric disease-causing protozoans have been found in the effluent of a pater
plant, which of the following is the most probably solution? - (ANSWER)use a
multibarrier approach - coagulation, flocculation, sedimentation, and filtration
What is the major cause of short-circuiting in a sedimentation basin? -
(ANSWER)poor inlet baffling
, Conventional sedimentation has a _____________ removal of Cryptospoidium
oocysts. - (ANSWER)less than 0.5-log
dissolved-air flotation is particularly good for removing ______. - (ANSWER)algae
as solids settle to the bottom of a sedimentation basin, the tank pressure is
reduced. - (ANSWER)a sludge layer develops
What is the maximum weir loaing for light alum floc in solids-contact basins? -
(ANSWER)10 gmp/ft
List four components of a typical rectangular sedimentation basin. - (ANSWER)any
four of the following: sludge pipe, scum trough, flights, collector drive, baffle,
effluent adjustable weirs
Which regulation basically requires that surface water systems maintain specified
C x T values before the treated water reaches the first customer? -
(ANSWER)SWTR
What is the primary test used to indicate proper sedimentation? - (ANSWER)test
for turbidity
Which type of sludge cannot be discharged to a sanitary sewer system because its
deposits might build up and block the sewers? - (ANSWER)lime sludge
EXAM COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY
GRADED A+||BRAND NEW!!
Water being served to the public for a propulation greater than 3,300 must not
have a disinfectant residual entering the distribution system below ____________
for more than 4 hours - (ANSWER)0.2 mg/L
What is the action level for copper? - (ANSWER)1.3 mg/L
Where are the sampling points located for required sampling of coliform bacteria
in a community water system? - (ANSWER)At points where water enters the
distribution system, including all filter effluents of surface water treatment plant
Under the Surface Water Treatment Rule, disinfection residuals must be collected
at the same location in the distribution system as? - (ANSWER)coliform samples
What I the MCL for haloacetic acids (HAA5)? - (ANSWER)0.060 mg/L
An example of _______ is determining the lowest monthly average during 12
month monitoring of Giardia and virus inactivation - (ANSWER)benchmarking
,What is the MCLG for substances that are suspected carcinogens? -
(ANSWER)zero
Which regulation is designed to limit huma exposure to harmful organisms,
including Cryptosporidium, by promoting achievement of particle and turbidity
removal targets for surface water treatment systems? - (ANSWER)IESWTR
Which regulation is designed to limit human exposure to fecal contamination that
may be present in public water systems that use ground water sources? -
(ANSWER)GWR
Which regulation is designed to promote routine surveillance of distribution
system water quality to search for contamination from fecal matter and/or
disease-causing bacteria? - (ANSWER)TCR
what is the optmal pH range for the removal of particulate matter whe using alum
as a coagulant? - (ANSWER)6.5-7.2
which forces will pull particles together once they have been destabilized in the
coagulation-flocculation process? - (ANSWER)van der Waals forces
Which of the following is a common mistake that operators make in regard to
flocculation units? - (ANSWER)Allowing excessive flocculation time
,Ferric sulfate has which advantage over aluminum sulfate (alum)? -
(ANSWER)more dense floc
The lower the _________ the more difficult it is to form a proper floc. -
(ANSWER)turbidity
Jar test results are expressed in - (ANSWER)milligrams per liter
List four characteristics of raw water that must be considered in selecting a
treatment chemical? - (ANSWER)any four of the following: type and concentration
of contaminants, temperature, alkalinity, pH, turbidity, color, total organic carbon
Raw water temperature that approaches the freezing t has what effect on
coagulation and flocculation process? - (ANSWER)as the water temperature
decreases the viscosity of the water increases, which slows the rate of floc settling
How much time is required to develop heavy floc particles during the flocculation
process? - (ANSWER)30 minutes
if enteric disease-causing protozoans have been found in the effluent of a pater
plant, which of the following is the most probably solution? - (ANSWER)use a
multibarrier approach - coagulation, flocculation, sedimentation, and filtration
What is the major cause of short-circuiting in a sedimentation basin? -
(ANSWER)poor inlet baffling
, Conventional sedimentation has a _____________ removal of Cryptospoidium
oocysts. - (ANSWER)less than 0.5-log
dissolved-air flotation is particularly good for removing ______. - (ANSWER)algae
as solids settle to the bottom of a sedimentation basin, the tank pressure is
reduced. - (ANSWER)a sludge layer develops
What is the maximum weir loaing for light alum floc in solids-contact basins? -
(ANSWER)10 gmp/ft
List four components of a typical rectangular sedimentation basin. - (ANSWER)any
four of the following: sludge pipe, scum trough, flights, collector drive, baffle,
effluent adjustable weirs
Which regulation basically requires that surface water systems maintain specified
C x T values before the treated water reaches the first customer? -
(ANSWER)SWTR
What is the primary test used to indicate proper sedimentation? - (ANSWER)test
for turbidity
Which type of sludge cannot be discharged to a sanitary sewer system because its
deposits might build up and block the sewers? - (ANSWER)lime sludge
