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