Quentin Square Development

Opifex Field Services completed a targeted geotechnical site investigation to support the foundation design for Mettris Construction’s proposed multi‑storey mixed‑use development at 22 St Quentin Avenue, Claremont. The investigation was designed to provide high‑quality subsurface data at depths relevant to the planned four‑level basement and deep pile foundations.

Working over a focused three‑day field campaign, Opifex supervised the drilling of a 45m PQ3 cored borehole using a specialist truck‑mounted rig, with Standard Penetration Tests conducted at key intervals to characterise ground strength and density. Core recovery, material logging and defect recording were undertaken by an Opifex geotechnical engineer in accordance with AS 1726, ensuring complete traceability and robust data quality. A suite of representative soil and rock samples was collected and transported under chain‑of‑custody to a NATA‑accredited laboratory for strength, plasticity, particle size and consolidation testing.

Prior to drilling, Opifex completed a BYDA services search, site walkover and potholing to safely establish the investigation location. All fieldwork was performed under a project‑specific safety and environmental management plan, ensuring safe execution within a constrained urban site.

The outcomes of the investigation provide Mettris Construction with high‑confidence geotechnical information on the underlying Tamala Limestone and deeper sedimentary units, enabling informed pile design, basement excavation planning and overall structural optimisation for the Quentin Square redevelopment.