1|Page
CWEA Grade 1 and 2 Tests Collection Systems
Maintenance Questions and Answers with Complete
Solutions UPDATED!!!
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
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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
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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
CWEA Grade 1 and 2 Tests Collection Systems
Maintenance Questions and Answers with Complete
Solutions UPDATED!!!
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
,2|Page
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
, 3|Page
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
