1
TCEQ Wastewater (Class D) License Prep
questions with correct answers
Minimum velocity required to keep solids in
suspension?
2ft/sec
Minimum required velocity a inverted siphon
requires?
3ft/sec
Two most common pipe materials used in the
collection system?
Clay & PVC
OSHA minimum standards for shoring, sloping, or
trench boxes are?
5ft or deeper
If the trench is _____ or deeper, use a portable ladder
or other means of exit.
4ft or deeper
The ladder most extend ____ feet above the trench
and be secured.
3ft
Ladders must be within ____ feet of trench workers
and not more than ____ feet apart.
25ft, 50ft
The excavation spoil must be at least?
2ft from the edge of the trench
Which type of pump is most often used in a lift
station?
TCEQ Wastewater (Class D) License Prep
questions with correct answers
Minimum velocity required to keep solids in
suspension?
2ft/sec
Minimum required velocity a inverted siphon
requires?
3ft/sec
Two most common pipe materials used in the
collection system?
Clay & PVC
OSHA minimum standards for shoring, sloping, or
trench boxes are?
5ft or deeper
If the trench is _____ or deeper, use a portable ladder
or other means of exit.
4ft or deeper
The ladder most extend ____ feet above the trench
and be secured.
3ft
Ladders must be within ____ feet of trench workers
and not more than ____ feet apart.
25ft, 50ft
The excavation spoil must be at least?
2ft from the edge of the trench
Which type of pump is most often used in a lift
station?
