CWEA Collection Systems Maintenance(Practice
Questions for CWEA Grade 1 and 2 Tests)Answered
Correctly!!
Why are gasoline and volatile solvents objectionable when present in a sewer?
They produce an explosion hazard
You should never attempt to install, maintain, repair or replace electrical
equipment panels, controls, wiring or circuits unless
You know what you are doing, are qualified and are authorized
What are the different areas of traffic zones?
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?
to protect from corrosion and odors
Personnel entering a Permit Required Confined Space must have the following
training
entry and rescue
To find protective gear before application of a product, you should:
look at the MSDS
The gas most commonly associated with septic wastewater is
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:
some dangerous gasses are odorless (for example, carbon monoxide)
What are the four conditions necessary to create an explosion?
combustible gas, adequate oxygen, heat and proper mixing of gas and oxygen
what does the "transition area" mean in traffic control?
It moves traffic out of its normal path
what elements should be considered to improve worker safety in High speed
Temporary Traffic control Zones?
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?
Traffic Control Plan, By-Pass connections, and Spill containment
What tools are used with a power rodder?
Spring Blades
Tools used for sewer rodding include:
porcupine, root saw, square bar cork screw
What tool would you use to cut VCP pipe?
Chain Pipe Cutter
Which conditions should a gas detection device test for?
Hydrogen sulfide, explosive/flammable gases, oxygen
What does "LEL" mean on a gas detection meter?
Lower Explosive Limit
, The oxygen level alarm normally goes off if oxygen levels are below:
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?
The L.O.T.O Program
What does L.O.T.O. Stand for?
Lock out tag out
What document would you require to be referenced when developing an S.O.p.
for hazardous substace spill clean up?
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?
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:
SSMP (Sewer System Management Plan)
How long do you have to report a category 1 SSO?
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?
Using the GPS coordinates
Biological activity in long, sluggish-flow, flat grade sewer lines will likely cause:
odors
Flatter sewer line grades may cause added sewer maintenance expense and odor
nuisance. This is caused by what?
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?
infiltration
Infiltration can occur in a pipe when the pipe is:
cracked, broken, fractures, has roots coming into it etc.
The main reason we add sodium hypochlorite to sewers is to control:
BOD
Roots can enter collection systems through:
cracked pipes, broken pipes, fractured pipes
The lowest point on the inside of a pipe is called what?
the invert
The very top of the outside of a pipe is called what?
The crown
How often must an excavation site and adjacent areas be inspected for hazardous
conditions?
Daily
protective shoring systems options include:
Questions for CWEA Grade 1 and 2 Tests)Answered
Correctly!!
Why are gasoline and volatile solvents objectionable when present in a sewer?
They produce an explosion hazard
You should never attempt to install, maintain, repair or replace electrical
equipment panels, controls, wiring or circuits unless
You know what you are doing, are qualified and are authorized
What are the different areas of traffic zones?
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?
to protect from corrosion and odors
Personnel entering a Permit Required Confined Space must have the following
training
entry and rescue
To find protective gear before application of a product, you should:
look at the MSDS
The gas most commonly associated with septic wastewater is
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:
some dangerous gasses are odorless (for example, carbon monoxide)
What are the four conditions necessary to create an explosion?
combustible gas, adequate oxygen, heat and proper mixing of gas and oxygen
what does the "transition area" mean in traffic control?
It moves traffic out of its normal path
what elements should be considered to improve worker safety in High speed
Temporary Traffic control Zones?
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?
Traffic Control Plan, By-Pass connections, and Spill containment
What tools are used with a power rodder?
Spring Blades
Tools used for sewer rodding include:
porcupine, root saw, square bar cork screw
What tool would you use to cut VCP pipe?
Chain Pipe Cutter
Which conditions should a gas detection device test for?
Hydrogen sulfide, explosive/flammable gases, oxygen
What does "LEL" mean on a gas detection meter?
Lower Explosive Limit
, The oxygen level alarm normally goes off if oxygen levels are below:
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?
The L.O.T.O Program
What does L.O.T.O. Stand for?
Lock out tag out
What document would you require to be referenced when developing an S.O.p.
for hazardous substace spill clean up?
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?
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:
SSMP (Sewer System Management Plan)
How long do you have to report a category 1 SSO?
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?
Using the GPS coordinates
Biological activity in long, sluggish-flow, flat grade sewer lines will likely cause:
odors
Flatter sewer line grades may cause added sewer maintenance expense and odor
nuisance. This is caused by what?
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?
infiltration
Infiltration can occur in a pipe when the pipe is:
cracked, broken, fractures, has roots coming into it etc.
The main reason we add sodium hypochlorite to sewers is to control:
BOD
Roots can enter collection systems through:
cracked pipes, broken pipes, fractured pipes
The lowest point on the inside of a pipe is called what?
the invert
The very top of the outside of a pipe is called what?
The crown
How often must an excavation site and adjacent areas be inspected for hazardous
conditions?
Daily
protective shoring systems options include:
