Excavation and Trenching Safety

What is the maximum allowable slope for Type A soil in simple slope excavations less than 20 ft. deep?

• 1:1

• 3/4:1

• 1-1/2:1

• Vertical

Which type of soil has an unconfined compressive strength of 1.5 tons per square foot or greater?

• Type A

• Type B

• Type C

• Type D

What is the maximum slope for all simple slope excavations in Type C soil?

• 1:1

• 1-1/2:1

• 3/4:1

• 2:1

Which of the following is a characteristic of Type B soil?

• Angular gravel

• Clay, silty clay

• Granular soils

• Sandy loam

What should be done before you dig to ensure safety?

• Call 811, the " Call Before You Dig" number

• Start digging immediately

• Use heavy machinery

• Ignore safety guidelines

What is the maximum lateral distance an employee should travel to an exit within a trench?

• 10 ft

• 15 ft

• 25 ft

• 30 ft

What is the minimum width for a foundation trench?

• 1 ft

• 2 ft

• 3 ft

• 4 ft

Which color is used for a grounded conductor in electrical safety?

• Red

• White

• Black

• Green

What is the color code for Phase 1 in power wiring 120-240 volt?

• Red

• Blue

• Black

• Brown

What is the purpose of shoring in trenching?

• To increase trench depth

• To prevent soil movement

• To allow water flow

• To remove debris