Significant Residual Impact Assessments

What is a Significant Residual Impact Assessment?

A Significant Residual Impact (SRI) assessment determines whether a proposed development will result in a significant residual impact on prescribed environmental matters after all reasonable avoidance and mitigation measures have been applied. In Queensland, a finding of significant residual impact may trigger a requirement to provide environmental offsets under the Environmental Offsets Act 2014 and the Queensland Environmental Offsets Policy.

Prescribed environmental matters include matters of state environmental significance (MSES) such as regulated vegetation, wetlands, waterways, protected wildlife habitat, and connectivity areas. Where a development is also assessed under Commonwealth legislation, matters of national environmental significance (MNES) under the Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act) may also require SRI assessment.

The SRI assessment is a critical step in the development approval process. It sits at the intersection of impact assessment and offset policy - determining not just whether ecological values are affected, but whether the residual impact remaining after avoidance and mitigation is significant enough to warrant offsets. Getting this assessment right is essential for both proponents seeking to understand their offset liabilities and regulators making informed decisions about approval conditions.

When Do You Need a Significant Residual Impact Assessment?

An SRI assessment is typically required when a development application involves impacts on one or more prescribed environmental matters. Common triggers include:

State Development Assessment

When a development application is referred to the State Assessment and Referral Agency (SARA) for assessment against state codes, the assessing authority must consider whether the development will result in a significant residual impact on MSES. This commonly arises in applications involving vegetation clearing, waterway works, or development in areas mapped as containing wildlife habitat values.

Local Government Assessment

Local governments in Queensland are responsible for assessing impacts on locally significant environmental matters. Many local planning schemes include overlays for matters such as biodiversity areas, waterway corridors, and koala habitat that may trigger SRI assessment requirements at the local level.

Commonwealth Assessment (EPBC Act)

For actions that may have a significant impact on MNES - such as listed threatened species, ecological communities, or world heritage values - the Commonwealth’s EPBC Environmental Offsets Policy applies. An SRI assessment against Commonwealth significance criteria is required to determine offset obligations for controlled actions.

Mining and Resource Activities

Environmental Authority applications for mining and petroleum activities must address significant residual impacts on prescribed environmental matters. The assessment informs conditions relating to offset requirements that may be attached to the Environmental Authority.

Our Process

Queensland Ecologists undertakes SRI assessments using a structured methodology aligned with the Queensland Environmental Offsets Policy and the significant residual impact guideline:

1. Identify Prescribed Environmental Matters - We undertake a comprehensive desktop analysis using state mapping layers (regulated vegetation, essential habitat, wetlands, waterways, wildlife habitat) and Commonwealth databases (PMST, SPRAT) to identify all prescribed matters that may be present on or adjacent to the development site.
2. Field Verification - Where desktop analysis indicates potential prescribed matters, we conduct targeted field surveys to verify their presence, extent, and ecological significance. This may include vegetation surveys, fauna habitat assessments, waterway assessments, or targeted threatened species surveys.
3. Apply the Avoidance and Mitigation Hierarchy - We work with the project team to identify opportunities to avoid impacts on prescribed matters through design modification, and to mitigate unavoidable impacts through construction management, revegetation, or other measures. This step is critical - offsets are only required for impacts that remain after all reasonable avoidance and mitigation has been applied.
4. Assess Significance of Residual Impacts - For each prescribed matter where residual impacts remain, we apply the significance criteria set out in the Queensland Environmental Offsets Policy (and the EPBC Significant Impact Guidelines where applicable). We consider factors including the extent of impact, the ecological context, the conservation status of the matter, and whether the impact may be irreversible.
5. Calculate Offset Requirements - Where a significant residual impact is identified, we use the Queensland Offsets Calculator or the EPBC Offsets Assessment Guide to determine the quantum of offset required. We present the offset obligation clearly, including the required offset area, habitat quality targets, and available delivery mechanisms.
6. Reporting - We prepare a comprehensive SRI assessment report that documents the prescribed matters assessed, the avoidance and mitigation measures considered, the significance assessment for each matter, and the resulting offset obligations. The report is formatted to meet the requirements of SARA, local government, and/or the Commonwealth Department of Climate Change, Energy, the Environment and Water.

Related Services

• Biodiversity Offset Strategies - strategic assessment of offset options and delivery mechanisms following an SRI finding
• Ecological Assessments - comprehensive ecological surveys that inform the SRI assessment
• EPBC Act Assessments - Commonwealth-level impact assessment for matters of national environmental significance
• Vegetation Management Act Assessments - assessment of regulated vegetation impacts under the VMA

Get a Quote

Understanding your offset obligations early in the development process can save significant time and cost. Queensland Ecologists provides clear, well-documented SRI assessments that give proponents and regulators confidence in the offset determination.

Contact us today for a no-obligation quote on your significant residual impact assessment.

Request a Quote Online or call us on (07) 3018 7538.