Type of drilling operation used to advance and stabilize the hole. Rock core run numbers, depths & lengths, core recovery, and Rock Quality Designation (RQD) Sampling resistance in terms of hydraulic pressure or blows per depth of sampler penetration. Sampler type, depth, penetration, and recovery. The depths of the various generalized soil and rock strata encountered. Identification of the subsoils and bedrock including density, consistency, color, moisture, structure, geologic origin. An accurate record of any deviation in the planned boring locations. Topographic survey data including boring location and surface elevation, and benchmark location and datum, if available. Typical boring log, core boring log and test pit log forms endorsed by the ASCE Soil Mechanics & Foundations Engineering Committee. The specific forms to be used for a given type of boring will depend on local practice. All appropriate portions of the logs should be completed in the field prior to completion of the field exploration.Ī wide variety of drilling forms are used by various agencies. The field log should be written or printed legibly and should be kept as clean as is practical. The boring log is the basic record of almost every geotechnical exploration and provides a detailed record of the work performed and the findings of the investigation.
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