Scout's Toolbox Talks

Soil classification isn’t guesswork — field tests give you the facts needed to choose proper protection.

Why It Matters:

Visual inspection alone can be misleading. Using simple field tests ensures the Competent Person selects the right protective system — and avoids collapse.

Key Points:

• Thumb Penetration Test:
  • Push your thumb into a fresh soil sample.
  • Hard to penetrate = likely Type A; easy = likely Type C.
• Plasticity Test:
  • Roll soil into a thin thread (⅛ inch diameter).
  • If it breaks easily, it’s likely sandy (Type C). Clay will remain flexible.
• Ribbon Test:
  • Squeeze soil between thumb and forefinger.
  • Longer ribbons mean higher cohesion (Type A/B); crumbly means less stability.
• Soil should be tested at least daily and whenever conditions change.

✅ Field tests aren’t optional — they’re your first defense.

Ask the Crew:

• Have we tested the soil today or just guessed?
• Who is responsible for daily classification?
• Are we adjusting protection when soil changes?

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