Borelog
A borelog records the soil profile from surface to depth: soil type, consistency, groundwater level, and fill. Used in AS 1726:2017 geotech reports.
Ask Chalkline about this →A borelog (also called a borehole log or test pit log) is a column chart that records the soil conditions at a site from the surface down to the investigation depth. The geotechnical engineer produces one borelog per borehole or test pit during a site investigation. For residential work, the format and notation follow AS 1726:2017 Geotechnical site investigations (verified 2026-05-10).
Each borelog typically shows: depth intervals in metres below ground level, a soil description (colour, moisture condition, consistency, plasticity), the sample type (disturbed auger sample or undisturbed thin-wall tube), any test results (Dynamic Cone Penetrometer blow counts or pocket penetrometer readings in kPa), the depth at which groundwater was encountered, and a note on any fill material and whether it is controlled or uncontrolled.
Builders read the borelog to check whether consistent stiff material exists at the proposed founding depth, whether fill is documented as controlled per AS 3798:2007, and whether the profiles between multiple boreholes are consistent. Significant variation between boreholes on the same site can indicate variable conditions that may trigger Class P classification under AS 2870:2011.
Also known as: borehole log, test pit log, soil log.
Category: Structural / Site investigation.
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Last updated: 2026-05-10. Verified: 2026-05-10. Quarterly review for currency.