Scout's Toolbox Talks

Soil Classification Basics

Toolbox Talk:

Don't Assume - Always Verify

June 22, 2025

Soil that looks stable might not be. Field tests — not guesswork — keep you safe.

Why It Matters:

Assuming the wrong soil type can lead to using the wrong protection system. That’s how cave-ins happen. Even clay-like soil can shift or crumble if misjudged.

Key Points:

  • Never rely on looks alone — visual inspection is just step one.
  • Field tests (thumb, plasticity, ribbon) must be done at the start of every dig.
  • When unsure, default to Type C and use maximum protection.
  • The Competent Person must lead classification — and reassess if conditions change.

Assume nothing. Confirm everything.

Ask the Crew:

  • Did we actually test the soil today — or just guess?
  • What signs tell us we need to retest?
  • Are we taking the cautious route — or cutting corners?