The Facts
22 On the applicant's application for an interlocutory injunction the applicant relied on a lengthy affidavit she had sworn and the respondent relied on an affidavit of Mr Michael Blythe and an affidavit of Dr Adrian Stokes. Mr Blythe and Dr Stokes are employees of the respondent. The affidavits I have referred to were also relied on for the respondent's application for summary judgment. The respondent also relied on affidavits filed and served since the application for an interlocutory injunction was heard and, in particular, a second affidavit of Dr Stokes. The affidavit material before me establishes the following facts.
23 In 2008 horse racing activities at Victoria Park ceased. At that time the respondent undertook a project to redevelop Victoria Park. The details of the project were embodied in a document called the Victoria Park Master Plan. Stage 1 of the project involved the redevelopment of the northern half of the Park. By early June 2011 that stage was almost complete. Stage 2 of the project involved the redevelopment of the southern half of the Park. That stage involved the upgrading of sporting pitches and the installation of a fitness track. It also involved the landscaping of the area and the installation of a new irrigation system.
24 In 2008 the current Community Land Management Plan was adopted and the Victoria Park Master Plan is appendix 1 to that Plan. In April 2010 the current Adelaide Park Lands Management Strategy was prepared by the Adelaide Park Lands Authority pursuant to s 18 of the Adelaide Park Lands Act 2005 (SA).
25 In 2009 substantial planning work was done by the respondent in relation to the redevelopment of Victoria Park. A native vegetation site survey to identify the extent of native vegetation in the Park was undertaken. Public consultation was undertaken and the applicant and the Adelaide Park Lands Preservation Association were involved in that process.
26 The respondent decided to retain an area of two hectares in size containing the best quality native vegetation in the area. That area was to be retained as a conservation area and, in fact, it was fenced off and signs erected to indicate its conservation value. The playing fields were designed around that area. The proposal was that any scattered plants outside that area would be relocated to other areas in Victoria Park.
27 On 27 April 2011 the respondent decided to proceed with the Stage 2 works, excluding a playing field (Playing Field No 10) immediately to the south east of the conservation area. Contracts were signed with the successful tenderer, ADCIV Pty Ltd, on 19 May 2011 and work commenced on 26 May 2011. As at 7 June 2011 topsoil and vegetation from approximately 75 per cent of the relevant area had been removed and stockpiled. Under the contracts with ADCIV Pty Ltd the works were required to be completed by the end of September 2011 and, according to Mr Blythe, allowing some contingency, the works had to be completed before the end of November 2011.
28 Planning of the proposed playing fields in the southern part of Victoria Park was well underway by the time of the Minister's listing of the threatened ecological community. It is convenient at this point to refer to the Minister's listing and matters associated with it.
29 On 19 March 2010 the Minister issued an instrument whereby, pursuant to s 184(1)(a) of the Act, he amended the list referred to in s 181 of the Act, which lists threatened ecological communities. He amended the list by including in it the Grey Box ecological community. It seems that the instrument commenced on 1 April 2010. The Minister described the Grey Box ecological community in a schedule to the instrument. The description is detailed and starts by outlining areas in Australia where the Grey Box ecological community may be found and the climatic and geographical conditions in which it may be found.
30 The Minister then describes the 'typical structure' of the ecological community and in that section the following statement appears:
Patches of the ecological community may occur as derived grassland, where the tree canopy and shrub layers have been removed but the native ground layer remains largely intact.
31 The Minister then describes in detail the components of the ecological community being a tree canopy, mid layer and ground layer. His description of the ground layer is as follows:
The ground layer is variable and ranges from largely absent to mostly grassy to forb-rich. The species composition also is variable and includes a range of tussock grasses, other grass-like plants, forbs and chenopods. Common graminoid genera present include Austrodanthonia (Wallaby Grasses), Austrostipa (Spear Grasses), Elymus (Wheat-grass), Enteropogon (Windmill Grasses), Dianella (Flax-lilies) and Lomandra (Mat-rushes). Chenopod genera commonly present include Atriplex, Chenopodium, Einadia, Enchylaena, Maireana, Salsola and Sclerolaena.
32 The Minister then sets out seven 'key diagnostic characteristics' for the ecological community. The last two are as follows:
• The ground layer also is highly variable in development and composition, ranging from almost absent to mostly grassy to forb-rich. Ground layer flora commonly present include one or more of the graminoid genera: Austrodanthonia, Austrostipa, Elymus, Enteropogon, Dianella and Lomandra; and one or more of the chenopod genera: Atriplex, Chenopodium, Einadia, Enchylaena, Maireana, Salsola and Sclerolaena.
• Derived grasslands are a state of the ecological community, whereby the canopy and mid layers have been mostly removed to <10% crown cover but the native ground layer remains largely intact, with 50% or more of the total vegetation cover being native.
33 The applicant put before me the Listing Advice (or part of it) of the Scientific Committee which preceded the Minister's decision to list the Grey Box ecological community. That advice contains what are called 'condition thresholds'. The function of the condition thresholds is described in the advice as follows:
Condition thresholds are intended to function as a set of criteria that assists in identifying when the EPBC Act is likely to apply to an ecological community. They provide guidance for when a patch of a threatened ecological community retains sufficient conservation values to be considered as a Matter of National Environmental Significance, as defined under the EPBC Act. This means that the protection provisions of the EPBC Act are focussed on the most valuable elements of Australia's natural environment, while heavily degraded patches, which do not trigger the 'significance test' of the EPBC Act will be largely excluded…
Condition thresholds for the Grey Box (E.microcarpa) Grassy Woodlands and Derived Native Grasslands of South-Eastern Australia are outlined in Table 1.
34 Table 1 relevantly provides:
The condition thresholds in Table 1 only apply to patches of native vegetation that meet the description of the national ecological community, including the key diagnostic characteristics, as outlined above.
Table 1. Condition thresholds for the Grey Box (E. microcarpas) Grassy Woodlands and Derived Native Grasslands of South-Eastern Australia ecological community.
Category and rationale Thresholds
Criteria that are broadly applicable 1a. The minimum patch size is 0.5 hectare;
AND
1b. The canopy layer contains Grey Box (E. microcarpa) as the dominant or co-dominant tree species;
AND
1c. The vegetative cover7 of non-grass weed8 species in the ground layer is less than 30% at any time of the year.
…
Additional criteria that apply to patches where the canopy is less developed or absent (derived grassland) (≥0.5 ha in area) 5a. Woodland density does not meet criteria 3a or 4a, or is a derived grassland with clear evidence that the site formerly was a woodland with a tree canopy dominated or co-dominated by E. microcarpa;
AND
5b. At least 50% of the vegetative cover in the ground layer is made up of perennial native species at any time of the year;
AND
5c. 12 or more native species are present in the ground layer at any time of the year.