36 Ms Burke confirmed that the existing draft policy was not comparable to the proposed biodiversity banking legislation, which would incorporate a detailed scheme with respect to assessing applicable credits and ratios.
37 When asked whether the Department considered the impacts on the site unavoidable, Ms Burke explained that the Department's position was always framed as advice to the consent authority, it being the consent authority's role to consider whether the development was appropriate. If the consent authority considered the development appropriate, then the Department provided its advice with respect to concurrence. The question of offsets would arise at that stage in the assessment. The Department had not proposed that the applicants acquire land because it inferred that the size of the development would make that course economically unviable. The proposed contribution was not ideal but, if the STIF on site was to be removed, the Department's suggestion was preferable to a mere contribution to revegetating lands already owned by the Council.
38 Ms Burke considered the Department's "offsetting principles and options" document prepared for the specific development the most relevant to understanding the policy underlying offsets. That document records the Department's view that if impacts on threatened species and endangered ecological communities were unavoidable, then development applications should include offsets to counterbalance these impacts. The document notes that the Department would support this approach where "it can be shown that no feasible alternative exists to the removal of vegetation". Further, that the decision "whether the current proposal, and any associated loss of vegetation, is justified rests with the consent authority". The objective underlying the offset approach is one of "no net loss", to balance adverse impacts, and to ensure that planning decisions do not diminish future recovery options. Accordingly, offsets should be considered a "last resort" option, to be explored "after all other options to minimise impacts have been considered". If these requirements were satisfied then the offset for any particular development should reflect six principles - namely:
1. preference should be given to a "like for like" offset.
2. the offset should be greater than the area cleared.
3. the offset should preferably be in proximity to the area impacted.
4. the offset actions should be located in strategic, targeted areas.
5. offsets should be in addition to existing initiatives and should not duplicate or replicate existing schemes or programs.
6. the offset must be secure and long-term.
39 These provisions reflect the Department's more general draft policy "principles for the use of biodiversity offsets in NSW". That draft policy also requires that offsets be underpinned by sound ecological principles, should aim for net improvements in biodiversity over time, must be enduring, should be agreed before the impact occurs, must be quantifiable in that impacts and benefits should be reliably estimated, must be targeted for a like for like or better conservation outcome, must be appropriately located in the same region, must be supplementary to existing requirements, and must be enforceable. The draft policy notes that the requirement that offsets be quantifiable involves applying a methodology based on the best available science to calculate the loss from the development and the gain from the offset, and that a state-wide tool will be developed for the bio-banking legislation based on the tools developed for the Native Vegetation Act.