Background
McMonigal Investments Pty Ltd and BW Sewell Pty Ltd appealed a deemed refusal of a development application for an industrial subdivision at 555 Bushells Ridge Road, Bushells Ridge. The 8.78-hectare site would have been subdivided into 14 community title lots for industrial purposes, requiring demolition, vegetation removal, earthworks, internal road construction, and stormwater infrastructure. Late in the proceedings, road upgrades to Gosford Road and Bushells Ridge Road were added at the requirement of Lake Macquarie City Council, extending the project’s footprint into areas that had not been surveyed during the appropriate season.
The controversy centred on impacts to the Genoplesium insigne (variable midge orchid), a critically endangered terrestrial species endemic to New South Wales with an estimated 25–50 individual plants remaining across approximately 25 known populations in the Lake Macquarie and Central Coast areas. The species flowers between September and October, with very limited geographic distribution and an unknown ecology regarding pollination, seed dispersal, and germination. The applicant proposed a soil translocation plan as mitigation, but this approach had never been attempted on this species.
The Court’s Holding
The court dismissed the appeal and refused development consent, finding that the applicant had failed to provide adequate information to assess serious and irreversible impacts (SAII) on biodiversity values under s 7.16 of the Biodiversity Act 2016 (NSW). Porter C held that surveys conducted in December 2025 during the dehiscence (seed-shedding) period, rather than the flowering period (September–October), were insufficient to establish whether the orchid was actually present in the road reserve areas. The court rejected the applicant’s “assumed presence approach”—assuming the species was present based on habitat suitability alone, without field confirmation—as an inadequate basis for determining whether the development would cause SAII.
The court accepted the evidence of Council’s expert ecologist, Dr Chris McLean, that (1) dormancy and variability in the species means that even targeted surveys might fail to detect all individuals; (2) the actual number of plants at risk is critical to assessing impact severity, yet the applicant’s area-based calculation under the biodiversity assessment method could not establish this; (3) orchid translocation has a success rate around 66 percent but a natural recruitment rate of only 2.8 percent, with translocated orchids functioning as “living dead” that survive to senescence without reproducing; and (4) the complex symbiotic fungal relationships required for the species’ survival would be difficult or impossible to replicate in translocation. Under s 7.16(2) of the Biodiversity Act, the consent authority must refuse consent if the development is likely to have SAII on biodiversity values. Without surveys during the flowering period, the court could not determine whether SAII would occur and therefore could not grant consent.
Key Takeaways
- Biodiversity assessments for critically endangered species must be based on actual field surveys conducted during the appropriate season (flowering period for orchids), not assumptions of presence based on habitat suitability alone.
- For species with small, variable populations and dormancy cycles, the applicant must provide specific data on individual plant numbers and locations, not merely area-based calculations, to support an SAII assessment.
- Unproven translocation methods—particularly for critically endangered species—cannot reliably serve as mitigation for development impacts; low recruitment rates and complex symbiotic dependencies render such plans speculative.
- Section 7.16(2) of the Biodiversity Act creates a mandatory refusal duty when a development is likely to have SAII on biodiversity values; absence of adequate information to assess SAII is grounds for refusal rather than approval.
Why It Matters
This decision reinforces strict requirements for environmental assessment in development decisions affecting critically endangered species. It establishes that proponents cannot rely on theoretical assumptions or area-based offsets when the actual presence and number of individuals in a threatened population remain unknown. The court’s endorsement of Dr McLean’s concerns about “living dead” translocation—where transplanted orchids persist without natural reproduction—signals judicial scepticism toward unproven, experimental mitigation measures as substitutes for true impact avoidance.
The case clarifies that under NSW’s Biodiversity Act framework, the consent authority’s duty to refuse consent for likely SAII is not discretionary. Where adequate information is absent, refusal is the appropriate response rather than conditional approval pending post-consent surveys or mitigation trials. For practitioners, the decision underscores that survey timing, methodology, and species-specific ecology are non-negotiable prerequisites for major development approvals affecting threatened species, particularly orchids whose cryptic habits and variable flowering cycles demand rigorous field assessment during their detectable season.