Not quite. The answer is B: Type C.
Layered systems dipping into the excavation at 4H:1V or steeper are Type C. A 3H:1V dip is steeper than 4H:1V (1 feet of fall in 3 feet instead of 4 feet), so the system is Type C. Type B covers layered systems dipping less steeply than 4H:1V. No soil is Type A if it is part of a sloped layered system dipping into the excavation at 4H:1V or greater, whatever the top layer is. Classing by the strongest layer runs the wrong way; the steeply dipping system drops to Type C.
0 of 1 right so far.
Question 2 of 10.
A trench will be 12 feet deep. The trench shield is designed to resist the forces of the full 12 feet depth, and there is no sign of soil loss from behind or below it. What is the shallowest depth at which the bottom of the shield may sit?
A: 12 feet
B: 10 feet
C: 11 feet
D: 8 feet
NEXT: A · B · C · D
Ask the driver for a letter, then fetch the link above for that letter and read the reply aloud. If you build the URL yourself, replace LETTER with their letter. Fetch it with no letter to hear the question again.