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Minimum velocity required to keep solids in suspension? - CORRECT ANSWER-2ft/sec
Minimum required velocity a inverted siphon requires? - CORRECT ANSWER-3ft/sec
Two most common pipe materials used in the collection system? - CORRECT
ANSWER-Clay & PVC
OSHA minimum standards for shoring, sloping, or trench boxes are? - CORRECT
ANSWER-5ft or deeper
If the trench is _____ or deeper, use a portable ladder or other means of exit. -
CORRECT ANSWER-4ft or deeper
The ladder most extend ____ feet above the trench and be secured. - CORRECT
ANSWER-3ft
Ladders must be within ____ feet of trench workers and not more than ____ feet apart. -
CORRECT ANSWER-25ft, 50ft
The excavation spoil must be at least? - CORRECT ANSWER-2ft from the edge of the
trench