GROUND UP THINKING. ENGINEERED CERTAINTY.

PTG Consulting’s geotechnical team brings clarity to what lies below. From the first borehole to final certification, we help clients understand site conditions, manage risk and make confident, informed decisions about what their ground can support.

Our division is led by experienced professionals certified as CPEng, RPEQ, RPEV and NER, supported by a multidisciplinary team of engineers, geophysicists, drillers and geotechnicians. Our geotechnical investigations are backed by in-house construction materials testing through Protest CMT — fewer interfaces, faster turnaround, and a single accountable team across the life of your project.

We work across Queensland, New South Wales, Victoria and WA, with permanent bases in Brisbane, the Sunshine Coast, Gold Coast, Ormeau, Melbourne, Perth and Townsville.

40+ geotechnical specialists across Australia

CPEng, RPEQ, RPEV & NER certified
ISO 9001 certified Quality Management  |  ISO 45001 certified Safety Management  |  ISO 14001 certified Environmental Management

Offices with onsite Protest CMT laboratories:
📍 Sunshine Coast — Baringa  |  (07) 5647 0457
📍 Ormeau  |  (07) 5647 0411
📍 Townsville  |  (07) 4774 7888

Additional offices:
📍 Brisbane — Milton  |  07 3444 6666
📍 Gold Coast — Ashmore  |  (07) 5647 0419
📍 Melbourne  |  (03) 9112 3822
📍 Perth  |  (08) 6188 4500

• Site Investigation — desktop studies, geotechnical drilling (auger, sonic, rotary mud, diamond core), groundwater monitoring and test pitting
• Geophysical & Seismic Surveys — MASW, reflection and refraction seismic, 3D subsurface profiling, rippability modelling, fault and void location
• Foundations & Site Classification — AS 2870 site classification, shallow and deep foundation design, bored pile design, certification and integrity testing
• Retaining Walls & Slope Stability — reinforced earth, gravity, boulder, crib, gabion, shotcrete and anchored systems to AS 1726 and AS 4678
• Basements & Deep Excavation — PLAXIS 2D finite element modelling, staged retention design, temporary working platform design
• Infrastructure & Pavement — pavement investigation and design, road, rail and pipeline corridor investigations, dam and embankment assessments, earthworks and ground improvement
• Mining & Environmental — mine infrastructure investigations, tailings and sediment dam assessments, acid sulfate soil assessment and management plans to Queensland QASSIT manual
• Construction & Advisory — footing inspections, distressed building investigations, natural disaster remediation, expert witness and court-compliant reporting, due diligence and peer review

Integrated Protest CMT testing
In-house construction materials testing at our Sunshine Coast, Ormeau and Brisbane offices — drilling, sampling, lab testing and reporting under one quality-assured workflow.

Geophysics specialists
Our team integrates MASW, reflection and refraction seismic directly into the geotechnical model — not reported in isolation. Faster, more economical, and accessible where conventional rigs can’t reach.

PLAXIS 2D modelling
Specialist finite element modelling for deep excavations, staged retention and settlement — including hybrid systems combining anchored shotcrete and cantilevered walls.

200+ pavement projects
Our pavement team has delivered more than 200 road and runway projects across South East Queensland and beyond.

Expert witness capability
Our principals provide independent expert witness support including PLAXIS modelling calibrated against seismic data for matters before courts and tribunals.

Location-specific services

Geotechnical Engineer Sunshine Coast →Geotechnical Engineer Gold Coast & Logan →