CWEA Collection Systems Maintenance/
Practice Questions & Answers for CWEA Grade
1 and 2 Tests/ 2024-2025
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!
Page 1 of 20
,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
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,
Page 2 of 20
, 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
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
Page 3 of 20
Practice Questions & Answers for CWEA Grade
1 and 2 Tests/ 2024-2025
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!
Page 1 of 20
,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
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,
Page 2 of 20
, 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
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
Page 3 of 20
