1
CWEA Collection Systems Maintenance
Questions with Correct Answers | Updated
(100% Correct Answers)
Why are gasoline and volatile solvents objectionable when present
in a sewer? Answer: They produce an explosion hazard
You should never attempt to install, maintain, repair or replace
electrical equipment panels, controls, wiring or circuits unless
Answer: You know what you are doing, are qualified and are
authorized
What are the different areas of traffic zones? Answer: Advance
Warning Area, Transition Area, Activity Area (buffer space and work
space), Termination Area. Could be 4 or 5, justify your answer on
the test!
why should hydrogen sulfide be controlled? Answer: to protect
from corrosion and odors
Personnel entering a Permit Required Confined Space must have the
following training Answer: entry and rescue
To find protective gear before application of a product, you should:
Answer: look at the MSDS
© 2025 All rights reserved
,2
The gas most commonly associated with septic wastewater is
Answer: Hydrogen Sulfide
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: Answer: some dangerous gasses are odorless (for
example, carbon monoxide)
What are the four conditions necessary to create an explosion?
Answer: combustible gas, adequate oxygen, heat and proper mixing
of gas and oxygen
what does the "transition area" mean in traffic control? Answer: It
moves traffic out of its normal path
what elements should be considered to improve worker safety in
High speed Temporary Traffic control Zones? Answer: Rerouting
traffic around the work site, positioning of law enforcement officers
in the temporary traffic control zone, and work zone training
What key features would you need to address when developing an
S.O.P. for a Lift Station failure? Answer: Traffic Control Plan, By-Pass
connections, and Spill containment
What tools are used with a power rodder? Answer: Spring Blades
Tools used for sewer rodding include: Answer: porcupine, root saw,
square bar cork screw
© 2025 All rights reserved
, 3
What tool would you use to cut VCP pipe? Answer: Chain Pipe
Cutter
Which conditions should a gas detection device test for? Answer:
Hydrogen sulfide, explosive/flammable gases, oxygen
What does "LEL" mean on a gas detection meter? Answer: Lower
Explosive Limit
The oxygen level alarm normally goes off if oxygen levels are below:
Answer: 19.5 percent
When developing an S.O.P. for scheduled maintenance of electrical
equipment, what program should be addressed as a primary safety
guideline? Answer: The L.O.T.O Program
What does L.O.T.O. Stand for? Answer: Lock out tag out
What document would you require to be referenced when
developing an S.O.p. for hazardous substace spill clean up? Answer:
M.S.D.S.
in developing an S.O.P. for air monitoring in a Permit Required
Confined Space you would include what two factors? Answer:
Placement of the blower and a weather forecast
© 2025 All rights reserved
CWEA Collection Systems Maintenance
Questions with Correct Answers | Updated
(100% Correct Answers)
Why are gasoline and volatile solvents objectionable when present
in a sewer? Answer: They produce an explosion hazard
You should never attempt to install, maintain, repair or replace
electrical equipment panels, controls, wiring or circuits unless
Answer: You know what you are doing, are qualified and are
authorized
What are the different areas of traffic zones? Answer: Advance
Warning Area, Transition Area, Activity Area (buffer space and work
space), Termination Area. Could be 4 or 5, justify your answer on
the test!
why should hydrogen sulfide be controlled? Answer: to protect
from corrosion and odors
Personnel entering a Permit Required Confined Space must have the
following training Answer: entry and rescue
To find protective gear before application of a product, you should:
Answer: look at the MSDS
© 2025 All rights reserved
,2
The gas most commonly associated with septic wastewater is
Answer: Hydrogen Sulfide
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: Answer: some dangerous gasses are odorless (for
example, carbon monoxide)
What are the four conditions necessary to create an explosion?
Answer: combustible gas, adequate oxygen, heat and proper mixing
of gas and oxygen
what does the "transition area" mean in traffic control? Answer: It
moves traffic out of its normal path
what elements should be considered to improve worker safety in
High speed Temporary Traffic control Zones? Answer: Rerouting
traffic around the work site, positioning of law enforcement officers
in the temporary traffic control zone, and work zone training
What key features would you need to address when developing an
S.O.P. for a Lift Station failure? Answer: Traffic Control Plan, By-Pass
connections, and Spill containment
What tools are used with a power rodder? Answer: Spring Blades
Tools used for sewer rodding include: Answer: porcupine, root saw,
square bar cork screw
© 2025 All rights reserved
, 3
What tool would you use to cut VCP pipe? Answer: Chain Pipe
Cutter
Which conditions should a gas detection device test for? Answer:
Hydrogen sulfide, explosive/flammable gases, oxygen
What does "LEL" mean on a gas detection meter? Answer: Lower
Explosive Limit
The oxygen level alarm normally goes off if oxygen levels are below:
Answer: 19.5 percent
When developing an S.O.P. for scheduled maintenance of electrical
equipment, what program should be addressed as a primary safety
guideline? Answer: The L.O.T.O Program
What does L.O.T.O. Stand for? Answer: Lock out tag out
What document would you require to be referenced when
developing an S.O.p. for hazardous substace spill clean up? Answer:
M.S.D.S.
in developing an S.O.P. for air monitoring in a Permit Required
Confined Space you would include what two factors? Answer:
Placement of the blower and a weather forecast
© 2025 All rights reserved
