Practical, referenced writing on site investigation, soil classification, laboratory testing and foundation design.https://geoeq.dev/enhttps://geoeq.dev/blog/spt-n-value-corrections/https://geoeq.dev/blog/spt-n-value-corrections/What each SPT correction factor does, when it applies, and a worked example taking a field blow count of 18 through energy, borehole, rod, sampler and overburden corrections to N1(60).Wed, 12 Aug 2026 00:00:00 GMTField practiceSPTN-valueASTM D1586site investigationliquefactionhttps://geoeq.dev/blog/reading-the-plasticity-chart/https://geoeq.dev/blog/reading-the-plasticity-chart/How Atterberg limits become a USCS group symbol — the A-line, the U-line, the CL-ML band, and the checks that catch a misclassified sample before it reaches the borehole log.Mon, 10 Aug 2026 00:00:00 GMTLaboratoryUSCSAtterberg limitsASTM D2487soil classificationplasticity chart