CWEA Collection Systems Maintenance/
Practice Questions & Answers for CWEA Grade
1 and 2 Tests/ 2024-2025
What tools are used with a power rodder? - Answer: Spring Blades
Tools used for sewer rodding include: - Answer: porcupine, root saw, square bar
cork screw
What tool would you use to cut VCP pipe? - Answer: Chain Pipe Cutter
Which conditions should a gas detection device test for? - Answer: Hydrogen
sulfide, explosive/flammable gases, oxygen
Page 1 of 21
,What does "LEL" mean on a gas detection meter? - Answer: Lower Explosive Limit
The oxygen level alarm normally goes off if oxygen levels are below: - 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? - Answer: The
L.O.T.O Program
What does L.O.T.O. Stand for? - 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? - 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? - 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: - Answer: SSMP
(Sewer System Management Plan)
How long do you have to report a category 1 SSO? - Answer: 2 hours
Page 2 of 21
, 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? - Answer: Using the GPS coordinates
Biological activity in long, sluggish-flow, flat grade sewer lines will likely cause: -
Answer: odors
Flatter sewer line grades may cause added sewer maintenance expense and odor
nuisance. This is caused by what? - 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? - Answer: infiltration
Infiltration can occur in a pipe when the pipe is: - Answer: cracked, broken,
fractures, has roots coming into it etc.
The main reason we add sodium hypochlorite to sewers is to control: - Answer:
BOD
Roots can enter collection systems through: - Answer: cracked pipes, broken
pipes, fractured pipes
The lowest point on the inside of a pipe is called what? - Answer: the invert
Page 3 of 21
Practice Questions & Answers for CWEA Grade
1 and 2 Tests/ 2024-2025
What tools are used with a power rodder? - Answer: Spring Blades
Tools used for sewer rodding include: - Answer: porcupine, root saw, square bar
cork screw
What tool would you use to cut VCP pipe? - Answer: Chain Pipe Cutter
Which conditions should a gas detection device test for? - Answer: Hydrogen
sulfide, explosive/flammable gases, oxygen
Page 1 of 21
,What does "LEL" mean on a gas detection meter? - Answer: Lower Explosive Limit
The oxygen level alarm normally goes off if oxygen levels are below: - 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? - Answer: The
L.O.T.O Program
What does L.O.T.O. Stand for? - 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? - 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? - 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: - Answer: SSMP
(Sewer System Management Plan)
How long do you have to report a category 1 SSO? - Answer: 2 hours
Page 2 of 21
, 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? - Answer: Using the GPS coordinates
Biological activity in long, sluggish-flow, flat grade sewer lines will likely cause: -
Answer: odors
Flatter sewer line grades may cause added sewer maintenance expense and odor
nuisance. This is caused by what? - 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? - Answer: infiltration
Infiltration can occur in a pipe when the pipe is: - Answer: cracked, broken,
fractures, has roots coming into it etc.
The main reason we add sodium hypochlorite to sewers is to control: - Answer:
BOD
Roots can enter collection systems through: - Answer: cracked pipes, broken
pipes, fractured pipes
The lowest point on the inside of a pipe is called what? - Answer: the invert
Page 3 of 21
