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CWEA COLLECTIONS SYSTEM
MAINTENANCE GRADE 3 EXAM 2026
QUESTIONS AND ANSWERS | A+
GRADED | WITH EXPERT SOLUTIONS
A Flagger should Stand?
A. On the shoulder adjacent to traffic being controlled
B. In the closed lane before stopping vehicle traffic
C. In the traffic lane.
D. As stated in "A" or "B" above. - correct answer-D. As stated in
"A" or "B" above.
Legally responsible officials are required to report category 1
sanitary sewer overflows?
A. Within 30 days
B. Before end of the day
C. As soon as possible
D. Within 2 hours - correct answer-D. Within 2 hours
When working in confined spaces or sewers, what form of lighting
would you use?
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A. Mirrors to direct the sunlight or explosion proof lighting.
B. Ordinary electric lights
C. Propane, Gas, or kerosene lanterns
D. Special matches - correct answer-A. Mirrors to direct the
sunlight or explosion proof lighting.
What can happen if water-based substances are used to
extinguish electrical fires?
a. Nothing but extinguish the fire
b. The fumes are not harmful
c. Receive an electrical shock
d. They will corrode the electrical contacts - correct answer-c.
Receive an electrical shock
When testing a manhole for explosive gases when should the first
tests be made?
a. After removing the manhole cover
b. Before removing the manhole cover
c. At any time
d. After ventilation - correct answer-b. Before removing the
manhole cover
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Atmospheric hazards encountered in manholes can include:
a. non-explosive atmospheres.
b. non-toxic atmosphere.
c. lack of oxygen.
d. non-flammable atmospheres. - correct answer-c. lack of
oxygen.
When setting up to ventilate a manhole, the air inlet should be
how many feet above street level?
a. 4.0
b. 3.0
c. 2.0
d. 1.0 - correct answer-c. 2.0
Which chemical may be used for odor control in a sewer system?
a. Calcium chloride
b. Hydrogen peroxide
c. Oxidized aluminum
d. Sodium chloride - correct answer-b. Hydrogen peroxide
CWEA COLLECTIONS SYSTEM
MAINTENANCE GRADE 3 EXAM 2026
QUESTIONS AND ANSWERS | A+
GRADED | WITH EXPERT SOLUTIONS
A Flagger should Stand?
A. On the shoulder adjacent to traffic being controlled
B. In the closed lane before stopping vehicle traffic
C. In the traffic lane.
D. As stated in "A" or "B" above. - correct answer-D. As stated in
"A" or "B" above.
Legally responsible officials are required to report category 1
sanitary sewer overflows?
A. Within 30 days
B. Before end of the day
C. As soon as possible
D. Within 2 hours - correct answer-D. Within 2 hours
When working in confined spaces or sewers, what form of lighting
would you use?
, Page | 2
A. Mirrors to direct the sunlight or explosion proof lighting.
B. Ordinary electric lights
C. Propane, Gas, or kerosene lanterns
D. Special matches - correct answer-A. Mirrors to direct the
sunlight or explosion proof lighting.
What can happen if water-based substances are used to
extinguish electrical fires?
a. Nothing but extinguish the fire
b. The fumes are not harmful
c. Receive an electrical shock
d. They will corrode the electrical contacts - correct answer-c.
Receive an electrical shock
When testing a manhole for explosive gases when should the first
tests be made?
a. After removing the manhole cover
b. Before removing the manhole cover
c. At any time
d. After ventilation - correct answer-b. Before removing the
manhole cover
, Page | 3
Atmospheric hazards encountered in manholes can include:
a. non-explosive atmospheres.
b. non-toxic atmosphere.
c. lack of oxygen.
d. non-flammable atmospheres. - correct answer-c. lack of
oxygen.
When setting up to ventilate a manhole, the air inlet should be
how many feet above street level?
a. 4.0
b. 3.0
c. 2.0
d. 1.0 - correct answer-c. 2.0
Which chemical may be used for odor control in a sewer system?
a. Calcium chloride
b. Hydrogen peroxide
c. Oxidized aluminum
d. Sodium chloride - correct answer-b. Hydrogen peroxide
