CWEA COLLECTION SYSTEMS MAINTENANCE Q&A
WITH COMPLETE SOLUTIONS GUARANTEED PASS
2025/2026
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
,The very top of the outside of a pipe is called what? -
ANSWER ->The crown
How often must an excavation site and adjacent areas be inspected for
hazardous conditions? - ANSWER ->Daily
protective shoring systems options include: - ANSWER >proper shoring
or benching of the sides of the excavation, supporting the sides of a
tench with shoring using a shield in an excavation area.
Proper operation and maintenance of wastewater collection is defined
as: - ANSWER ->keeping wastewater flowing through pipes
What is minimum design velocity for a sewer? - ANSWER
->a minimum of two feet per second
Vitrified clay pipe is what type of pipe? - ANSWER ->Rigid
What is another name for a manhole? - ANSWER -
>Maintenance hole
What are the four parts of a manhole? - ANSWER ->lid, cone, barrel and
base
What are some sewer testing methods? - ANSWER ->Air, water,
mandrill, smoke, dye, lamping
, What are some hydraulic cleaning methods? - ANSWER >Flushing,
balling, kites, parachutes, poly pigs (pigging), high velocity cleaning,
jetting, skids and tiger tails.
what is the formula for the area of a square? - ANSWER -
>Length x width
The main advantage of using CCTV is what? - ANSWER >You can see
and record the length and severity of defective pipe
A hazard that may damage a TV camera going through a sewer is: -
ANSWER ->an offset joint
What is the formula for the volume of a cube? - ANSWER
->Length x Width x Height
What is the formula for the area of a circle? - ANSWER -
>0.785 x Diameter x Diameter
What is the formula for the volume of a pipe? - ANSWER
->0.785 x Diameter x Diameter x Length
A flow of 650 pgm would be how many mgd? - ANSWER -
>0.936
How can the members of a balling crew communicate with each other?
- ANSWER ->Hand Signals
WITH COMPLETE SOLUTIONS GUARANTEED PASS
2025/2026
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
,The very top of the outside of a pipe is called what? -
ANSWER ->The crown
How often must an excavation site and adjacent areas be inspected for
hazardous conditions? - ANSWER ->Daily
protective shoring systems options include: - ANSWER >proper shoring
or benching of the sides of the excavation, supporting the sides of a
tench with shoring using a shield in an excavation area.
Proper operation and maintenance of wastewater collection is defined
as: - ANSWER ->keeping wastewater flowing through pipes
What is minimum design velocity for a sewer? - ANSWER
->a minimum of two feet per second
Vitrified clay pipe is what type of pipe? - ANSWER ->Rigid
What is another name for a manhole? - ANSWER -
>Maintenance hole
What are the four parts of a manhole? - ANSWER ->lid, cone, barrel and
base
What are some sewer testing methods? - ANSWER ->Air, water,
mandrill, smoke, dye, lamping
, What are some hydraulic cleaning methods? - ANSWER >Flushing,
balling, kites, parachutes, poly pigs (pigging), high velocity cleaning,
jetting, skids and tiger tails.
what is the formula for the area of a square? - ANSWER -
>Length x width
The main advantage of using CCTV is what? - ANSWER >You can see
and record the length and severity of defective pipe
A hazard that may damage a TV camera going through a sewer is: -
ANSWER ->an offset joint
What is the formula for the volume of a cube? - ANSWER
->Length x Width x Height
What is the formula for the area of a circle? - ANSWER -
>0.785 x Diameter x Diameter
What is the formula for the volume of a pipe? - ANSWER
->0.785 x Diameter x Diameter x Length
A flow of 650 pgm would be how many mgd? - ANSWER -
>0.936
How can the members of a balling crew communicate with each other?
- ANSWER ->Hand Signals
