CWEA Collection Systems Maintenance questions and accurate answers
Why are gasoline and volatile solvents objectionable when present in a sewer? - correct
answer-They produce an explosion hazard
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
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!
why should hydrogen sulfide be controlled? - correct answer-to protect from corrosion and
odors
Personnel entering a Permit Required Confined Space must have the following training -
correct answer-entry and rescue
To find protective gear before application of a product, you should: - correct answer-look at
the MSDS
The gas most commonly associated with septic wastewater is - correct 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: - correct answer-some
dangerous gasses are odorless (for example, carbon monoxide)
What are the four conditions necessary to create an explosion? - correct answer-
combustible gas, adequate oxygen, heat and proper mixing of gas and oxygen
what does the "transition area" mean in traffic control? - correct answer-It moves traffic
out of its normal path
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
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
What tools are used with a power rodder? - correct answer-Spring Blades
Tools used for sewer rodding include: - correct answer-porcupine, root saw, square bar
cork screw
, What tool would you use to cut VCP pipe? - correct answer-Chain Pipe Cutter
Which conditions should a gas detection device test for? - correct answer-Hydrogen
sulfide, explosive/flammable gases, oxygen
What does "LEL" mean on a gas detection meter? - correct answer-Lower Explosive Limit
The oxygen level alarm normally goes off if oxygen levels are below: - correct answer-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? - correct answer-The L.O.T.O
Program
What does L.O.T.O. Stand for? - correct answer-Lock out tag out
What document would you require to be referenced when developing an S.O.p. for
hazardous substace spill clean up? - correct answer-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? - correct answer-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: - correct answer-SSMP (Sewer
System Management Plan)
How long do you have to report a category 1 SSO? - correct answer-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? -
correct answer-Using the GPS coordinates
Biological activity in long, sluggish-flow, flat grade sewer lines will likely cause: - correct
answer-odors
Flatter sewer line grades may cause added sewer maintenance expense and odor
nuisance. This is caused by what? - correct answer-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? - correct answer-infiltration
Infiltration can occur in a pipe when the pipe is: - correct answer-cracked, broken,
fractures, has roots coming into it etc.
Why are gasoline and volatile solvents objectionable when present in a sewer? - correct
answer-They produce an explosion hazard
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
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!
why should hydrogen sulfide be controlled? - correct answer-to protect from corrosion and
odors
Personnel entering a Permit Required Confined Space must have the following training -
correct answer-entry and rescue
To find protective gear before application of a product, you should: - correct answer-look at
the MSDS
The gas most commonly associated with septic wastewater is - correct 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: - correct answer-some
dangerous gasses are odorless (for example, carbon monoxide)
What are the four conditions necessary to create an explosion? - correct answer-
combustible gas, adequate oxygen, heat and proper mixing of gas and oxygen
what does the "transition area" mean in traffic control? - correct answer-It moves traffic
out of its normal path
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
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
What tools are used with a power rodder? - correct answer-Spring Blades
Tools used for sewer rodding include: - correct answer-porcupine, root saw, square bar
cork screw
, What tool would you use to cut VCP pipe? - correct answer-Chain Pipe Cutter
Which conditions should a gas detection device test for? - correct answer-Hydrogen
sulfide, explosive/flammable gases, oxygen
What does "LEL" mean on a gas detection meter? - correct answer-Lower Explosive Limit
The oxygen level alarm normally goes off if oxygen levels are below: - correct answer-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? - correct answer-The L.O.T.O
Program
What does L.O.T.O. Stand for? - correct answer-Lock out tag out
What document would you require to be referenced when developing an S.O.p. for
hazardous substace spill clean up? - correct answer-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? - correct answer-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: - correct answer-SSMP (Sewer
System Management Plan)
How long do you have to report a category 1 SSO? - correct answer-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? -
correct answer-Using the GPS coordinates
Biological activity in long, sluggish-flow, flat grade sewer lines will likely cause: - correct
answer-odors
Flatter sewer line grades may cause added sewer maintenance expense and odor
nuisance. This is caused by what? - correct answer-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? - correct answer-infiltration
Infiltration can occur in a pipe when the pipe is: - correct answer-cracked, broken,
fractures, has roots coming into it etc.
