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CWEA Collection Systems Maintenance | 140 Questions with 100% CORRECT ANSWER s
Question 1: Why are gasoline and volatile solvents
objectionable when present in a sewer?
CORRECT ANSWER : They produce an explosion hazard
Question 2: You should never attempt to install, maintain, repair
or replace electrical equipment panels, controls, wiring or circuits unless
CORRECT ANSWER : You know what you are doing, are
qualified and are authorized
Question 3: What are the different areas of traffic zones?
CORRECT 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!
Question 4: why should hydrogen sulfide be controlled?
CORRECT ANSWER : to protect from corrosion and odors
Question 5: Personnel entering a Permit Required Confined
Space must have the following training
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CORRECT ANSWER : entry and rescue
Question 6: To find protective gear before application of a
product, you should:
CORRECT ANSWER : look at the MSDS
Question 7: The gas most commonly associated with septic
wastewater is
CORRECT ANSWER : Hydrogen Sulfide
Question 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:
CORRECT ANSWER : some dangerous gasses are odorless (for
example, carbon monoxide)
Question 9: What are the four conditions necessary to create an
explosion?
CORRECT ANSWER : combustible gas, adequate oxygen, heat
and proper mixing of gas and oxygen
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Question 10: what does the "transition area" mean in traffic
control?
CORRECT ANSWER : It moves traffic out of its normal path
Question 11: what elements should be considered to improve
worker safety in High speed Temporary Traffic control Zones?
CORRECT ANSWER: Rerouting traffic around the work site,
positioning of law enforcement officers in the temporary traffic control zone, and work zone training
Question 12: What key features would you need to address
when developing an S.O.P. for a Lift Station failure?
CORRECT ANSWER : Traffic Control Plan, By-Pass
connections, and Spill containment
Question 13: What tools are used with a power rodder?
CORRECT ANSWER : Spring Blades
Question 14: Tools used for sewer rodding include:
CORRECT ANSWER : porcupine, root saw, square bar cork
screw
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Question 15: What tool would you use to cut VCP pipe?
CORRECT ANSWER : Chain Pipe Cutter
Question 16: Which conditions should a gas detection device
test for?
CORRECT ANSWER : Hydrogen sulfide, explosive/flammable
gases, oxygen
Question 17: What does "LEL" mean on a gas detection meter?
CORRECT ANSWER : Lower Explosive Limit
Question 18: The oxygen level alarm normally goes off if
oxygen levels are below:
CORRECT ANSWER : 19.5 percent
Question 19: When developing an S.O.P. for scheduled
maintenance of electrical equipment, what program should be addressed as a primary safety guideline?