Rock Solid Geotechnics


Rock Solid Geotechnics Pty Ltd is a company based in southern Tasmania specialising in statewide Geotechnical Assessment, Soil Testing, and Onsite Wastewater Assessment and Design, principally, but not exclusively, for residential developments.


New residential developments all require site Foundation Classification. These “Soil Tests” describe the site surface and subsurface conditions, providing essential information required to correctly design the residential footings.
Site Stability and Erosion

Geotechnical Assessments

Geotechnical Assessments, completed by a “suitably qualified and experienced geotechnical practitioner” who has appropriate professional indemnity insurance (Geotechnical Engineer or Engineering Geologist) are required by councils, engineers, builders and designers when site stability and erosion are paramount.

Australian Standard

All Geotechnical Assessments are completed in accordance with Australian Standard 1726-1993: Geotechnical Site Investigations. Residential Foundation Classifications are completed in accordance with Australian Standard AS2870-2011: Residential slabs and footings, and are usually complemented by a Wind Load Rating: AS4055-2006: Wind loads for housing.

Landslip and Erosion

Risk Assessment of Geotechnical Hazards

All Geotechnical Assessments (and “Soil Tests”) require a risk assessment of geotechnical hazards. Hazards may include landslips, expansive / reactive clay soils, steep land, areas subject to inundation, areas containing fill material, low Bearing Capacity sites, coastal erosion, contaminated sites, groundwater, erosion, or dispersive soils.

Site Investigation For Hazards

Site Investigations

Site investigations include mapping of geomorphological features and hazards, profile mapping (utilizing hand or mechanical augers, or test pitting with an excavator, and soil sampling. Laboratory assessment of clay soils is often required to accurately classify the site (Shrink / Swell Assessment).

Wastewater Assessment and System Design

Wastewater System Design

Residences located on sites that do not have council provided wastewater services require Onsite Wastewater Assessment and Wastewater System Design. These assessments and designs must be completed in accordance with Australian Standard AS/NZS1547:2012: On-site domestic-wastewater management, and must be completed by accredited Wastewater Designers.

Soil Evaluation Report

Wastewater Site and Soil Evaluation Report

A wastewater Site and Soil Evaluation Report assesses a site for suitability to dispose of domestic onsite wastewater and will ultimately be used to determine the type, size and position of a suitable wastewater system.

Onsite Wastewater Treatment and Disposal

Onsite Wastewater

Onsite Wastewater can be treated and disposed of utilizing many different types of systems. These include “traditional” septic tank and trench based systems, On ground sand filter systems (Bottomless Sand Filters, Wisconsin Mounds and Raised Beds), Aerated Wastewater Treatment Systems, and Composting toilets and greywater disposal systems to name a few.

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Southern Tasmania


0417 960 769

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