Drinking Water Operator Certification Limited Treatment
(D-Level) Practice Exam (Michigan Department of
Environment, Great Lakes, and Energy) Questions With
Complete Solutions
0.00 ppm-1.00 ppm Correct Answers polyphosphates can be
used for sequestering iron up to what level
13432.51 lbs Correct Answers a water plant produces 1.2 mgd
and their raw water has 11.2 grains per gallon (gpg) of hardness.
if all hardness is removed, how many pounds are removed in 7
days
170 ft Correct Answers a high service pump from the plant is
uses to fill an elevated storage tank that is 145 ft tall. if the
suction lift on the pump is 25ft what is the total head that is
needed to fill the tank
178.35lbs Correct Answers a water system has a raw water
concentration of 1.8 ppm of iron and a finished water
concentration of 0.3ppm as iron. if the plant produces 3300 gpm
of finished water, how many pounds of iron will be removed in
72 hours
20.41 Gallons Correct Answers a water system treats 4.1 mgd
and wishes to maintain a chlorine residual of 0.7 ppm how many
gallons of 11.5% available chlorine will they need to feed per
day? assume it weighs 10.2lbs/gal
2000 feet Correct Answers what is the minimum isolation
distance of municipal well from a major source of contamination
, 23913 gallons Correct Answers how many gallons of water can
be treated through a softener with 275,000 grain capacity before
regeneration if the raw water has a hardness of 18.7 gpg and the
finished water has a hardness of 7.2 gpg
29.49 lbs Correct Answers how many pounds of 25%
hydrofluorosilicic acid (19.8% available fluoride) will be
required to apply 1.0 ppm of fluoride in 1 million gallons (1mg)
of water if the natural fluoride concentration is 0.3 mg/l
30 hours Correct Answers what is the maximum hold time for a
bacteriological sample
35 celsius +_ 0.5 Correct Answers what is the proper incubation
temperature when using an approved bacteriological testing
method for bacteriological samples in drinking water
4 Correct Answers if a system takes 60 routine bacteriological
samples, how many positive total coliform samples trigger a
level 1 assessment
45.33 Gallons Correct Answers a water treatment plant
produces 1125 gpm. the raw water has a demand of 0.45 ppm,
and the system wishes to maintain a residual of 1.1 ppm of
chlorine. how many gallons of 5.25% available chlorine will be
required per day to do this? assume bleach weighs 8.8 lbs/gal
5 years Correct Answers what is the record retention for
bacteriological samples results
(D-Level) Practice Exam (Michigan Department of
Environment, Great Lakes, and Energy) Questions With
Complete Solutions
0.00 ppm-1.00 ppm Correct Answers polyphosphates can be
used for sequestering iron up to what level
13432.51 lbs Correct Answers a water plant produces 1.2 mgd
and their raw water has 11.2 grains per gallon (gpg) of hardness.
if all hardness is removed, how many pounds are removed in 7
days
170 ft Correct Answers a high service pump from the plant is
uses to fill an elevated storage tank that is 145 ft tall. if the
suction lift on the pump is 25ft what is the total head that is
needed to fill the tank
178.35lbs Correct Answers a water system has a raw water
concentration of 1.8 ppm of iron and a finished water
concentration of 0.3ppm as iron. if the plant produces 3300 gpm
of finished water, how many pounds of iron will be removed in
72 hours
20.41 Gallons Correct Answers a water system treats 4.1 mgd
and wishes to maintain a chlorine residual of 0.7 ppm how many
gallons of 11.5% available chlorine will they need to feed per
day? assume it weighs 10.2lbs/gal
2000 feet Correct Answers what is the minimum isolation
distance of municipal well from a major source of contamination
, 23913 gallons Correct Answers how many gallons of water can
be treated through a softener with 275,000 grain capacity before
regeneration if the raw water has a hardness of 18.7 gpg and the
finished water has a hardness of 7.2 gpg
29.49 lbs Correct Answers how many pounds of 25%
hydrofluorosilicic acid (19.8% available fluoride) will be
required to apply 1.0 ppm of fluoride in 1 million gallons (1mg)
of water if the natural fluoride concentration is 0.3 mg/l
30 hours Correct Answers what is the maximum hold time for a
bacteriological sample
35 celsius +_ 0.5 Correct Answers what is the proper incubation
temperature when using an approved bacteriological testing
method for bacteriological samples in drinking water
4 Correct Answers if a system takes 60 routine bacteriological
samples, how many positive total coliform samples trigger a
level 1 assessment
45.33 Gallons Correct Answers a water treatment plant
produces 1125 gpm. the raw water has a demand of 0.45 ppm,
and the system wishes to maintain a residual of 1.1 ppm of
chlorine. how many gallons of 5.25% available chlorine will be
required per day to do this? assume bleach weighs 8.8 lbs/gal
5 years Correct Answers what is the record retention for
bacteriological samples results
