CWEA COLLECTION SYSTEMS
MAINTENANCE EXAM Questions and
Correct Answers Verified
1. Why are gasoline and volatile solvents objectionable when present
in a sewer?
They produce an explosion hazard.
Explanation: Gasoline and volatile solvents can form flammable vapors
that pose a significant explosion risk in sewer environments.
2. You should never attempt to install, maintain, repair, or replace
electrical equipment panels, controls, wiring, or circuits unless:
You know what you are doing, are qualified, and are authorized.
Explanation: Electrical work requires proper training and authorization
to prevent injuries or accidents.
3. What are the different areas of traffic zones?
Advance Warning Area, Transition Area, Activity Area (buffer space
and work space), Termination Area.
Explanation: Traffic control zones are divided into these areas to ensure
safety for workers and the traveling public. Justification: The transition
area is where traffic shifts from normal flow to the work zone, so it’s
critical to include it.
,4. Why should hydrogen sulfide be controlled?
To protect from corrosion and odors.
Explanation: H₂S is corrosive to infrastructure and produces foul odors.
5. Personnel entering a Permit-Required Confined Space must have
the following training:
Entry and rescue.
Explanation: Training in safe entry and rescue procedures is mandatory
for confined spaces.
6. To find protective gear before applying a product, you should:
Look at the MSDS.
Explanation: The Material Safety Data Sheet provides information on
necessary protective equipment.
7. The gas most commonly associated with septic wastewater is:
Hydrogen Sulfide.
Explanation: H₂S is produced by bacterial activity in septic systems.
8. The lack of an unpleasant odor in a manhole, lift station, or other
structures does not always mean that dangerous gases are not present
because:
Some dangerous gases are odorless (e.g., carbon monoxide).
Explanation: Odorless gases can be deadly even if no smell is detected.
, 9. What are the four conditions necessary to create an explosion?
Combustible gas, adequate oxygen, heat, and proper mixing of gas
and oxygen.
Explanation: All these conditions must be present for an explosion to
occur.
10. What does the "transition area" mean in traffic control?
It moves traffic out of its normal path.
Explanation: The transition area is where traffic is diverted or shifted
from its usual flow.
11. What elements should be considered to improve worker safety in
high-speed temporary traffic control zones?
Rerouting traffic around the work site, positioning of law enforcement
officers, and work zone training.
Explanation: Proper traffic rerouting, law enforcement presence, and
staff training are key safety elements.
12. What key features should be addressed when developing a
Standard Operating Procedure (SOP) for a lift station failure?
Traffic Control Plan, Bypass connections, and Spill containment.
Explanation: These ensure safe, efficient, and environmentally
protective response.
13. What tools are used with a power rodder?
Spring Blades.
MAINTENANCE EXAM Questions and
Correct Answers Verified
1. Why are gasoline and volatile solvents objectionable when present
in a sewer?
They produce an explosion hazard.
Explanation: Gasoline and volatile solvents can form flammable vapors
that pose a significant explosion risk in sewer environments.
2. You should never attempt to install, maintain, repair, or replace
electrical equipment panels, controls, wiring, or circuits unless:
You know what you are doing, are qualified, and are authorized.
Explanation: Electrical work requires proper training and authorization
to prevent injuries or accidents.
3. What are the different areas of traffic zones?
Advance Warning Area, Transition Area, Activity Area (buffer space
and work space), Termination Area.
Explanation: Traffic control zones are divided into these areas to ensure
safety for workers and the traveling public. Justification: The transition
area is where traffic shifts from normal flow to the work zone, so it’s
critical to include it.
,4. Why should hydrogen sulfide be controlled?
To protect from corrosion and odors.
Explanation: H₂S is corrosive to infrastructure and produces foul odors.
5. Personnel entering a Permit-Required Confined Space must have
the following training:
Entry and rescue.
Explanation: Training in safe entry and rescue procedures is mandatory
for confined spaces.
6. To find protective gear before applying a product, you should:
Look at the MSDS.
Explanation: The Material Safety Data Sheet provides information on
necessary protective equipment.
7. The gas most commonly associated with septic wastewater is:
Hydrogen Sulfide.
Explanation: H₂S is produced by bacterial activity in septic systems.
8. The lack of an unpleasant odor in a manhole, lift station, or other
structures does not always mean that dangerous gases are not present
because:
Some dangerous gases are odorless (e.g., carbon monoxide).
Explanation: Odorless gases can be deadly even if no smell is detected.
, 9. What are the four conditions necessary to create an explosion?
Combustible gas, adequate oxygen, heat, and proper mixing of gas
and oxygen.
Explanation: All these conditions must be present for an explosion to
occur.
10. What does the "transition area" mean in traffic control?
It moves traffic out of its normal path.
Explanation: The transition area is where traffic is diverted or shifted
from its usual flow.
11. What elements should be considered to improve worker safety in
high-speed temporary traffic control zones?
Rerouting traffic around the work site, positioning of law enforcement
officers, and work zone training.
Explanation: Proper traffic rerouting, law enforcement presence, and
staff training are key safety elements.
12. What key features should be addressed when developing a
Standard Operating Procedure (SOP) for a lift station failure?
Traffic Control Plan, Bypass connections, and Spill containment.
Explanation: These ensure safe, efficient, and environmentally
protective response.
13. What tools are used with a power rodder?
Spring Blades.
