41 Paragraph (c): In relation to the regional distribution of the habitat of a threatened species, population or ecological community, whether a significant area of known habitat is to be modified or removed:
In my opinion, this paragraph requires an evaluation of "a significant area", not specifically in its own right, but "in relation to the regional distribution of the habitat" of a threatened species. The significance, in that comparative sense, might lie in the size of the area compared to the area of regional distribution, and it might, independently or in addition, lie in the conservation value of the area compared to the conservation value of the regional distribution of the habitat.
42 I should interpolate here that Mr Preston dwelt at some length in his submissions on the proper construction of the words "known habitat", especially in view of the fact that par (c) uses the word "habitat" twice. I think he is correct in his submission that the words mean the habitat as known and described by the Scientific Committee in its final determination in relation to the particular threatened species. In this case, nothing much turns on this question, and I have been content to regard the "known habitat" of CPW in terms of the description in the CPW final determination.
43 As to area, Ms James' opinion was that approximately 7 hectares of CPW will be modified or removed. That area would comprise the whole of the school site of 6 hectares, and an additional one hectare outside the perimeter of the school site, the latter resulting from "edge effects", that is, indirect impact from isolation or increased inputs of water and nutrients. The 7 hectares are, in Ms James's opinion, significant by reason of being part of a larger remnant on the ADI site that is identified as a core biodiversity area for CPW, and because these hectares comprise a large remnant in their own right.
44 I do not accept that the modification or removal of up to 7 hectares of CPW will be significant compared to the regional distribution of the habitat of CPW. As some of the expert witnesses noted, NPWS 2000 indicated that about 26,724 hectares of CPW occur on the Cumberland Plain, representing about 21% of CPW that existed before European settlement. Both Dr Ambrose and Dr Robertson calculated that the an area of up to 7 hectares represents only 0.026% of the area of CPW that remains on the Cumberland Plain. Furthermore, an area of 629 hectares of CPW on the ADI site is to be located within a proposed regional park (see par 55), and Dr Ambrose pointed out that the area of that proposed regional park is about 105 times as large as the school site.
45 However, the evidence is equivocal in relation to the conservation value of the area of the school site and consequently in relation to whether a significant area of known habitat is to be modified or removed. As Dr Ambrose, Dr Robertson and Mr Thomas each pointed out, the school site is highly modified and degraded. Ms James recognised this, but she considered that the school site had good regeneration potential. Her opinion was that CPW at the school site is at a seral stage, and that sufficient diversity of native CPW species exists to allow recovery of the community to a near natural state if mowing, slashing and grazing are controlled. And in cross-examination, Dr Ambrose conceded that the school site had regeneration potential which could increase species richness and diversity.
46 A plank in Mr Norton's argument that the school site was a significant area of CPW habitat was based on its regeneration potential. He claimed that, since the existence of CPW has now been recognised on the school site, further slashing, mowing and similar activities will not be able to continue in the absence of appropriate environmental impact assessment under pt 4 or pt 5 of the EP&A Act, or under the National Parks and Wildlife Act 1974 ("the NPW Act"), or under the Environment Protection and Biodiversity Conservation Act 1999 (Cth). However, Mr Ayling submitted that little weight should be placed on the regeneration potential of the school site in the absence of evidence as to whether that potential is likely to be realised.
47 I accept the evidence that CPW on the school site has a potential to regenerate but I consider that this potential, taken on its own, is insufficient to conclude that a significant area of known habitat is to be removed or modified when compared to the regional distribution of CPW.
48 There is also a question of loss of biodiversity. Ms James thought that there were at least six regionally vulnerable species recorded on the school site that had not been recorded elsewhere on the ADI site. Dr Ambrose took issue with the number six, but conceded that there were three such regionally vulnerable species, and that, if the development on the school site was carried out, it would be possible, but unlikely (given the lack of complete surveys of the ADI site) that these three species might be lost entirely from the ADI site. However, both Mr Ayling and Mr Preston submitted, I think correctly, that the focus is not upon individual species, but upon the community of vegetation which comprises CPW as described in the CPW final determination. The question is whether a significant area of known habitat of the community is to be modified or removed, in relation to the regional distribution of the habitat of that community. The loss of three individual species (accepting that would occur, contrary to Dr Ambrose's opinion) would not require an affirmative answer to the factor specified in par (c).
49 Mr Doherty's evidence is also relevant to the issue of conservation value. His opinion was that the modification or removal of any area whatsoever of CPW would be significant. He said that all remaining patches of CPW assume significance where the vegetation type is greatly reduced and highly fragmented, whether the significance is related to existing value for flora or the potential to obtain such value via natural or assisted regeneration processes. Mr Ayling and Mr Preston each submitted, in effect, that Mr Doherty's opinion was unrealistic. I think that submission is correct. If accepted, it would render the eight part test otiose because the question posed by s 78A(8)(b) would always be answered in the affirmative. Any development that modified or removed any area of threatened species habitat would have to be regarded as likely to have a significant affect, no matter what degree of modification or removal was involved. This does not accord with the question posed by s 78A(8)(b) nor with the eight part test.
50 Having regard to all these matters, I find that, in relation to the regional distribution of the habitat of CPW, no significant area of known habitat is to be modified or removed.
51 Paragraph (d): whether an area of known habitat is likely to become isolated from currently interconnecting or proximate areas of habitat for a threatened species, population or ecological community:
The school site is located in the north-western corner of the ADI site. Its northern boundary fronts Ninth Avenue. It adjoins the ADI site on its southern and eastern boundaries. To the west is a triangular parcel of land comprising a densely wooded area of CPW.
52 The experts focussed primarily on the likelihood of isolation of the triangular area of CPW. Ms James was of the opinion that the triangular area was likely to become partially isolated because its existing contiguity eastward into the school site will be lost. Mr Doherty was of an almost identical opinion. He thought that partial isolation of the triangular area would occur on the east, although it would not be totally isolated on the south. However, Dr Ambrose's analysis was that the triangular area would have a 450 m wide interface with the rest of the ADI site over its southern boundary, wide enough to allow sufficient movement of animals and plant materials, so that there would be no isolation. Dr Robertson thought that there would be a slight reduction of connectivity, but not to the extent that would result in isolation of currently interconnecting or proximate areas of habitat. Mr Thomas was of the same opinion because of the location of the school site at the edge of the ADI site.