CWEA COLLECTION SYSTEMS
MAINTENANCE EXAM QUESTIONS AND
ANSWERS 2026 VERIFIED.
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
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 16
,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
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 16
, 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
@COPYRIGHT ALL RIGHTS RESERVED PAGE 3 OF 16
MAINTENANCE EXAM QUESTIONS AND
ANSWERS 2026 VERIFIED.
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
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 16
,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
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 16
, 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
@COPYRIGHT ALL RIGHTS RESERVED PAGE 3 OF 16
