OP 4530 Trench Rescue

Question 1

Types of soil and definition

Answer 1

• Compact soil: soil intact and solid
• Saturated soil: soil w/ water
• Running soil: soil thats moving/running

Question 2

Construction grade shoring

Answer 2

Best type of shoring (the strongest)

Question 3

Emergency Trench Shoring has the strength of what?

Answer 3

3/4” plywood 2x10 uprights and 4x4 whalers

Question 4

Temporary Shoring can be done with what material form engine

Answer 4

Backboards, ladders cribbing

Question 5

Types of trench shoring from strongest to weakest

Answer 5

Construction Grade (shoring company)
Emergency (USAR)
Temporary (First in)

Question 6

Tactical Elements of Trench Rescue

Answer 6

Command
Rescue
Medical
Hazards

Question 7

On scene information for Trench Rescue

Answer 7

Standard on scene with location and what you see staging and access location (possible perimeter)

Question 8

Information you want to communicate in size up

Answer 8

• type of trench
• type of collapse (additional collapse potential)
• number of victims (last known location)
• rescue or recovery mode
• need for Technical Rescue
• hazards (water in trench, gas fuel)
• exclusion zones
• Commitment

Question 9

Hazard Control responsibilities at a trench

Answer 9

• secure utilities (lock out tag out)
• mark utilities in trench
• monitor atmosphere trench
• ventilate and lighting

Question 10

Rescue Group responsibilities at trench

Answer 10

• Site control
• Set up retrieval system w/ edge protection
• Stabilize (speed shores)
• Rescue victim
• Remove water/dirt out of trench for rescue

Question 11

How do you signal evacuation at a trench rescue?

Answer 11

Must have a competent person who can see everything available with a whistle

Question 12

Compact soil must be shored when it is deeper than how many feet?

Saturated or running soil must be shored when it is deeper than how many feet?

Answer 12

5’ for compact soil

4’ for saturated or running soil

Question 13

At a trench call would start with what type of shoring?
After USAR arrives they would insert what type of shoring?
The shoring that USAR puts in would be replaced with what type of shoring and when?

Answer 13

• Temporary shoring (backboards and cribbing)
• Emergency Shoring (speed shores)
• Construction grade shoring will replace emergency shoring when we transition from rescue to recovery

Question 14

When do you need fall protection/retrieval system in trench?

Answer 14

• Trench is 20’
• Water in the Trench
• Working over bell bottom curve
• Permit required confined space