In Port Macquarie, our geotechnical laboratory testing supports site characterisation across the Mid North Coast’s variable residual profiles and alluvial corridors. Routine physical tests—including grain size analysis (sieve + hydrometer)—quantify particle distribution from coarse sands to clay fractions, directly informing permeability estimates and fill suitability under AS 1289 methods. For fine-grained soils common in the Hastings Valley, Atterberg limits define plasticity ranges critical to classifying reactive clays and predicting volume-change potential in accordance with AS 2870.
These procedures underpin foundation design for residential slabs, road subgrade assessments, and stormwater infiltration systems where shrink-swell behaviour or drainage capacity governs performance. Integrating grain size analysis (sieve + hydrometer) with Atterberg limits delivers a reliable framework for earthworks specifications and structural footing recommendations tailored to local conditions.