1
CWEA Collections System Maintenance Grade
3 Questions with Correct Answers | Updated
(100% Correct Answers)
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. 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 Answer: D. Within 2 hours
When working in confined spaces or sewers, what form of lighting
would you use?
© 2025 All rights reserved
,2
A. Mirrors to direct the sunlight or explosion proof lighting.
B. Ordinary electric lights
C. Propane, Gas, or kerosene lanterns
D. Special matches 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 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
© 2025 All rights reserved
, 3
d. After ventilation Answer: b. Before removing the manhole cover
Atmospheric hazards encountered in manholes can include:
a. non-explosive atmospheres.
b. non-toxic atmosphere.
c. lack of oxygen.
d. non-flammable atmospheres. 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 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
© 2025 All rights reserved
CWEA Collections System Maintenance Grade
3 Questions with Correct Answers | Updated
(100% Correct Answers)
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. 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 Answer: D. Within 2 hours
When working in confined spaces or sewers, what form of lighting
would you use?
© 2025 All rights reserved
,2
A. Mirrors to direct the sunlight or explosion proof lighting.
B. Ordinary electric lights
C. Propane, Gas, or kerosene lanterns
D. Special matches 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 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
© 2025 All rights reserved
, 3
d. After ventilation Answer: b. Before removing the manhole cover
Atmospheric hazards encountered in manholes can include:
a. non-explosive atmospheres.
b. non-toxic atmosphere.
c. lack of oxygen.
d. non-flammable atmospheres. 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 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
© 2025 All rights reserved
