CWEA Collections System Maintenance
Grade 3 Exam Questions and Answers
100% Solved
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. - ✔✔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 - ✔✔D. Within 2 hours
When working in confined spaces or sewers, what form of lighting would you
use?
A. Mirrors to direct the sunlight or explosion proof lighting.
B. Ordinary electric lights
1|Page
©KERRYMARTIN 2025/2026. YEAR PUBLISHED 2025.
,C. Propane, Gas, or kerosene lanterns
D. Special matches - ✔✔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 - ✔✔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 - ✔✔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.
2|Page
©KERRYMARTIN 2025/2026. YEAR PUBLISHED 2025.
, d. non-flammable atmospheres. - ✔✔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 - ✔✔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 - ✔✔b. Hydrogen peroxide
What information must be on a warning tag attached to a switch that has been
locked out?
a. Directions for removing tag.
b. Name of nearest physician to call in case of emergency.
c. Signature of person who locked out switch and who is the only person
authorized to remove tag.
3|Page
©KERRYMARTIN 2025/2026. YEAR PUBLISHED 2025.
Grade 3 Exam Questions and Answers
100% Solved
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. - ✔✔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 - ✔✔D. Within 2 hours
When working in confined spaces or sewers, what form of lighting would you
use?
A. Mirrors to direct the sunlight or explosion proof lighting.
B. Ordinary electric lights
1|Page
©KERRYMARTIN 2025/2026. YEAR PUBLISHED 2025.
,C. Propane, Gas, or kerosene lanterns
D. Special matches - ✔✔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 - ✔✔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 - ✔✔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.
2|Page
©KERRYMARTIN 2025/2026. YEAR PUBLISHED 2025.
, d. non-flammable atmospheres. - ✔✔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 - ✔✔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 - ✔✔b. Hydrogen peroxide
What information must be on a warning tag attached to a switch that has been
locked out?
a. Directions for removing tag.
b. Name of nearest physician to call in case of emergency.
c. Signature of person who locked out switch and who is the only person
authorized to remove tag.
3|Page
©KERRYMARTIN 2025/2026. YEAR PUBLISHED 2025.
