MEOC Excavation Techniques & Site Management 3

Question 1

When excavating in wet or saturated soil, what operational adjustment should a mini excavator operator make?

Accepted Answer

Reduce bucket fill percentage and take smaller passes

Answer

Increase bucket crowd force to compensate for weight

Answer

Use maximum swing speed to clear material faster

Answer

Lock the dozer blade down for ballast

Question 2

What is 'daylight benching' in the context of excavation site management?

Accepted Answer

Stepping back trench walls in horizontal tiers to increase stability

Answer

Scheduling excavation only during daylight hours

Answer

Grading toward natural drainage outlets

Answer

Exposing underground utilities before digging

Question 3

During excavation, you uncover what appears to be an unmarked utility line not shown on the site drawings. What is your immediate action?

Accepted Answer

Stop work, back away, and notify the site supervisor immediately

Answer

Carefully remove it with the bucket to assess

Answer

Mark it with paint and continue working around it

Answer

Call 811 while keeping the bucket in place

Question 4

What is the correct method for excavating a bell-bottom pier hole with a mini excavator?

Accepted Answer

Drill straight down and flare outward at the base with a specialty attachment

Answer

Bucket-dig an oversized hole and backfill the sides

Answer

Use the blade to push material inward at the base

Answer

Swing the boom laterally to widen the bottom

Question 5

A project specification requires 95% Proctor compaction on backfill. What does this mean for the excavation operator?

Accepted Answer

Backfill must be placed in lifts and tested for density before the next lift

Answer

The excavator must tamp each bucket of backfill before dumping

Answer

Compaction is only required on the final 12 inches of fill

Answer

The specification applies only to granular soils

Question 6

What is the safest approach for excavating next to an existing building foundation?

Accepted Answer

Excavate in short parallel passes maintaining a safe distance, working inward gradually

Answer

Excavate quickly to minimize vibration exposure time

Answer

Undermine the footing and immediately install shoring

Answer

Start at the building face and work outward

Question 7

How should a mini excavator operator handle a boulder encountered during normal soil excavation?

Accepted Answer

Assess size, then use a hydraulic hammer attachment or call for specialized equipment if needed

Answer

Attempt to crowd the bucket underneath and lever it out

Answer

Use maximum breakout force on top to shatter it

Answer

Backfill around it and redirect the excavation