Published September 2026.

This guidance note on standard penetration test (SPT) procedure and reporting covers some issues that have recently arisen, specifically:

• Procedure for tests terminated early, including a possible conflict between BS EN ISO 22476-3 and guidance from the British Drilling Association (BDA).
• Reporting for tests terminated early, on logs and in AGS data.
• Extending SPTs to 100 blows in soft rock and other materials.
• Reporting of seating blows, on logs and in AGS data including discussion of BS EN ISO 22476-3 requirements.