E – 1291 Boring Log Interpretation

A boring log is a description of exploration procedures and subsurface conditions encountered during drilling, sampling and coring.

Learning Objectives

At the successful conclusion of this course, you’ll be able to identify and discuss:

• Topographic survey data including boring location and surface elevation, and bench mark location, and datum, if available.
• An accurate record of any deviation in the planned boring locations.
• Identification of the subsoils and bedrock including density, consistency, color, moisture, structure, geologic origin.
• The depths of the various generalized soil and rock strata encountered.
• Sampler type, depth, penetration, and recovery.
• Sampling resistance in terms of hydraulic pressure or blows per depth of sampler penetration.
• Size and type of hammer; Height of drop.
• Soil sampling interval and recovery.
• Rock core run numbers, depths & lengths, core recovery, and Rock
• Quality Designation (RQD)
• Type of drilling operation used to advance and stabilize the hole.
• Comparative resistance to drilling.
• Loss of drilling fluid.
• Water level observations with remarks on possible variations due to tides and river levels.