CWEA Collection Systems Maintenance Exam Questions and Answers Latest Update (Graded A+)
Why are gasoline and volatile solvents objectionable when present in a sewer? - Answers They produce
an explosion hazard
You should never attempt to install, maintain, repair or replace electrical equipment panels, controls,
wiring or circuits unless - Answers You know what you are doing, are qualified and are authorized
What are the different areas of traffic zones? - Answers 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? - Answers to protect from corrosion and odors
Personnel entering a Permit Required Confined Space must have the following training - Answers entry
and rescue
To find protective gear before application of a product, you should: - Answers look at the MSDS
The gas most commonly associated with septic wastewater is - Answers 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: - Answers some dangerous gasses are odorless (for example,
carbon monoxide)
What are the four conditions necessary to create an explosion? - Answers combustible gas, adequate
oxygen, heat and proper mixing of gas and oxygen
what does the "transition area" mean in traffic control? - Answers It moves traffic out of its normal path
what elements should be considered to improve worker safety in High speed Temporary Traffic control
Zones? - Answers 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? -
Answers Traffic Control Plan, By-Pass connections, and Spill containment
What tools are used with a power rodder? - Answers Spring Blades
Tools used for sewer rodding include: - Answers porcupine, root saw, square bar cork screw
What tool would you use to cut VCP pipe? - Answers Chain Pipe Cutter
Which conditions should a gas detection device test for? - Answers Hydrogen sulfide,
explosive/flammable gases, oxygen
What does "LEL" mean on a gas detection meter? - Answers Lower Explosive Limit
The oxygen level alarm normally goes off if oxygen levels are below: - Answers 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? - Answers The L.O.T.O Program
What does L.O.T.O. Stand for? - Answers Lock out tag out
What document would you require to be referenced when developing an S.O.p. for hazardous substace
spill clean up? - Answers 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? - Answers Placement of the blower and a weather forecast
According to the State Water Resources Control Board Order No. 2006-003-DWQ, each enrollee must
develop and implement a system-specific: - Answers SSMP (Sewer System Management Plan)
How long do you have to report a category 1 SSO? - Answers 2 hours
To report in the Statewide SSO Data-base California Integrated Water Quality System (CIWQS) regarding
the location of a Category 2 SSO, how must you report the location? - Answers Using the GPS
coordinates
Biological activity in long, sluggish-flow, flat grade sewer lines will likely cause: - Answers odors
Flatter sewer line grades may cause added sewer maintenance expense and odor nuisance. This is
caused by what? - Answers A decrease in velocity which allows organic and inorganic solids to settle out.
This, in turn, allows biological activity to happen which corrodes the pipe and releases hydrogen sulfide
(H2S) which smells like rotten eggs
Clear water in entering a collection system is called what? - Answers infiltration
Infiltration can occur in a pipe when the pipe is: - Answers cracked, broken, fractures, has roots coming
into it etc.
The main reason we add sodium hypochlorite to sewers is to control: - Answers BOD
Roots can enter collection systems through: - Answers cracked pipes, broken pipes, fractured pipes
The lowest point on the inside of a pipe is called what? - Answers the invert
The very top of the outside of a pipe is called what? - Answers The crown
How often must an excavation site and adjacent areas be inspected for hazardous conditions? - Answers
Daily
protective shoring systems options include: - Answers proper shoring or benching of the sides of the
excavation, supporting the sides of a tench with shoring using a shield in an excavation area.
Proper operation and maintenance of wastewater collection is defined as: - Answers keeping
wastewater flowing through pipes
Why are gasoline and volatile solvents objectionable when present in a sewer? - Answers They produce
an explosion hazard
You should never attempt to install, maintain, repair or replace electrical equipment panels, controls,
wiring or circuits unless - Answers You know what you are doing, are qualified and are authorized
What are the different areas of traffic zones? - Answers 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? - Answers to protect from corrosion and odors
Personnel entering a Permit Required Confined Space must have the following training - Answers entry
and rescue
To find protective gear before application of a product, you should: - Answers look at the MSDS
The gas most commonly associated with septic wastewater is - Answers 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: - Answers some dangerous gasses are odorless (for example,
carbon monoxide)
What are the four conditions necessary to create an explosion? - Answers combustible gas, adequate
oxygen, heat and proper mixing of gas and oxygen
what does the "transition area" mean in traffic control? - Answers It moves traffic out of its normal path
what elements should be considered to improve worker safety in High speed Temporary Traffic control
Zones? - Answers 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? -
Answers Traffic Control Plan, By-Pass connections, and Spill containment
What tools are used with a power rodder? - Answers Spring Blades
Tools used for sewer rodding include: - Answers porcupine, root saw, square bar cork screw
What tool would you use to cut VCP pipe? - Answers Chain Pipe Cutter
Which conditions should a gas detection device test for? - Answers Hydrogen sulfide,
explosive/flammable gases, oxygen
What does "LEL" mean on a gas detection meter? - Answers Lower Explosive Limit
The oxygen level alarm normally goes off if oxygen levels are below: - Answers 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? - Answers The L.O.T.O Program
What does L.O.T.O. Stand for? - Answers Lock out tag out
What document would you require to be referenced when developing an S.O.p. for hazardous substace
spill clean up? - Answers 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? - Answers Placement of the blower and a weather forecast
According to the State Water Resources Control Board Order No. 2006-003-DWQ, each enrollee must
develop and implement a system-specific: - Answers SSMP (Sewer System Management Plan)
How long do you have to report a category 1 SSO? - Answers 2 hours
To report in the Statewide SSO Data-base California Integrated Water Quality System (CIWQS) regarding
the location of a Category 2 SSO, how must you report the location? - Answers Using the GPS
coordinates
Biological activity in long, sluggish-flow, flat grade sewer lines will likely cause: - Answers odors
Flatter sewer line grades may cause added sewer maintenance expense and odor nuisance. This is
caused by what? - Answers A decrease in velocity which allows organic and inorganic solids to settle out.
This, in turn, allows biological activity to happen which corrodes the pipe and releases hydrogen sulfide
(H2S) which smells like rotten eggs
Clear water in entering a collection system is called what? - Answers infiltration
Infiltration can occur in a pipe when the pipe is: - Answers cracked, broken, fractures, has roots coming
into it etc.
The main reason we add sodium hypochlorite to sewers is to control: - Answers BOD
Roots can enter collection systems through: - Answers cracked pipes, broken pipes, fractured pipes
The lowest point on the inside of a pipe is called what? - Answers the invert
The very top of the outside of a pipe is called what? - Answers The crown
How often must an excavation site and adjacent areas be inspected for hazardous conditions? - Answers
Daily
protective shoring systems options include: - Answers proper shoring or benching of the sides of the
excavation, supporting the sides of a tench with shoring using a shield in an excavation area.
Proper operation and maintenance of wastewater collection is defined as: - Answers keeping
wastewater flowing through pipes
