In Sydney, the soil tells a story before you even break ground. We run grain size analysis on samples from Parramatta clay to Hawkesbury sandstone residuals. The mix of particle sizes defines how water drains, how compaction behaves, and whether a slope will hold. We process each sample through a nested sieve stack for the coarse fraction. The fine fraction below 75 microns goes to the hydrometer. It sounds simple, but the interpretation is where experience counts. A well-graded sand from the Nepean floodplain behaves nothing like a poorly graded sand from the Eastern Suburbs. Before you design a foundation, you need to confirm those layers with a placa de carga test on site. That link between lab numbers and field performance is what we deliver every day.
A single grain size curve can decide whether your fill compacts properly or your pavement drains in ten years.