CWEA Collection Systems Maintenance/
Practice/140 Questions & Answers for CWEA
Grade 1 and 2 Tests/ 2024-2025
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
Page 1 of 20
,The gas most commonly associated with septic wastewater is - Answer: Hydrogen
Sulfide
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!
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
Page 2 of 20
, 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
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
Page 3 of 20
Practice/140 Questions & Answers for CWEA
Grade 1 and 2 Tests/ 2024-2025
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
Page 1 of 20
,The gas most commonly associated with septic wastewater is - Answer: Hydrogen
Sulfide
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!
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
Page 2 of 20
, 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
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
Page 3 of 20
