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Roads Western Australia Harold Road Passing Lanes (Albany Highway SLK 240.4 - 243.25) Biological Assessment

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Roads Western Australia Harold Road Passing Lanes (Albany Highway SLK 240.4 - 243.25) Biological Assessment Main Roads Western Australia Harold Road Passing Lanes (Albany Highway SLK 240.4 - 243.25) Biological Assessment August 2016 Executive summary Main Roads Western Australia is proposing to upgrade a section of Albany Highway near Kojonup in the Great Southern region of Western Australia. The upgrade involves the construction of a passing lane between Straight Line Kilometre (SLK) 240.4 and 243.25 referred to as the Harold Road Passing Lane. GHD was commissioned by Main Roads to undertake a biological assessment of the Study area (17.22 ha). The purpose of the assessment was to delineate key flora, vegetation, fauna, soil, groundwater and surface water values within the Study area. This report is subject to, and must be read in conjunction with, the limitations set out in Section 1.5 and the assumptions and qualifications contained throughout the Report. The assessment determined the following key features: The survey identified two broad native vegetation types, revegetation areas and cleared (highly degraded) areas (9.98 ha). The vegetated areas include: – Eucalyptus wandoo, Allocasuarina lehmanniana and Acacia acuminata Woodland (6.93 ha) – Eucalyptus rudis Woodland (0.23 ha) – Revegetation (0.1 ha) These vegetation types align with the mapped pre-European (Beard 1979) vegetation association: ‘Medium woodland; marri & wandoo’ (Association 4). The current extent of Association 4 is below 30 % at the State and IBRA subregion level and at the local government authority level (Shire of Kojonup) The field survey did not identify the presence of any conservation significant flora species. Based on habitats present within the Study area and the known distribution of these species, 12 could possibly occur; however, these species were not recorded during the field survey The assessment recorded approximately 7.11 ha of the Critically Endangered Ecological Community, Eucalypt Woodlands of the Western Australian Wheatbelt within the Study area Where native vegetation was present it ranged in condition from Very Good (3) to Degraded-Completed Degraded (5-6). The main disturbances observed throughout the Study area included anthropogenic related disturbances, clearing and weeds A total of 124 flora taxa (93 native and 31 introduced) including subspecies and varieties, representing 36 families and 90 genera were recorded from the Study area during the field survey One species listed as a Weed of National Significance and as a Declared Pest under the Biosecurity and Agriculture Management Act 2007 was recorded during the field survey: *Asparagus asparagoides (Bridal Creeper) During the field survey no fauna species of conservation significance were recorded. Three conservation significant species are likely to occur; Carnaby's Black Cockatoo (Calyptorhynchus latirostris), Baudin's Black Cockatoo (Calyptorhynchus baudinii), and Forest Red-tailed Black Cockatoo (Calyptorhynchus banksii naso) There are 203 trees in the Study area that are large enough to be considered as potential breeding trees for Black Cockatoos (DSEWPaC 2012). Seven of these large trees contain GHD | Report for Main Roads Western Australia - Harold Road Passing Lanes (Albany Highway SLK 240.4 - 243.25), 61/34517 | i hollows that would be suitable for Black Cockatoo breeding; however, there was no evidence of current or previous breeding recorded during the field survey. The Study area contains 7.26 ha of habitat that is foraging habitat for Black Cockatoos. Environmental approvals and referrals Matters of National Environmental Significance Referral to the DotE under the EPBC Act is triggered if a proposed action has or potentially has a significant impact on any MNES. It is likely that a referral will be required for this Project due to the: Presence of Black Cockatoo habitat including potential breeding trees (203) and foraging habitat (7.26 ha) within the Study area Presence of approximately 7.11 ha of the Critically Endangered Ecological Community, Eucalypt Woodlands of the Western Australian Wheatbelt within the Study area. Environmental Protection Authority In the absence of a broader environmental assessment, the majority of the likely biological impacts associated with the project are linked to native vegetation clearing and loss of fauna habitat. The potential impacts from the loss of native vegetation and loss of fauna habitat may be effectively assessed through the Environmental Protection (Clearing of Native Vegetation) Regulations 2004. Therefore with consideration of the biological values discussed in this report, it is considered unlikely that the project would require referral to the EPA under Section 38 of the EP Act. Department of Environment Regulation One Critically Endangered Ecological Community - Eucalypt Woodlands of the Western Australian Wheatbelt was recorded from the Study area. Three fauna of conservation significance are considered likely to occur in Study area. As such, any clearing permit application should assess the significance of any potential impacts of the proposed clearing on these species. ii | GHD | Report for Main Roads Western Australia - Harold Road Passing Lanes (Albany Highway SLK 240.4 - 243.25), 61/34517 Table of contents 1. Introduction.....................................................................................................................................1 1.1 Project background..............................................................................................................1 1.2 Study area............................................................................................................................1 1.3 Scope of works ....................................................................................................................1 1.4 Relevant legislation, conservation codes and background information...............................2 1.5 Limitations............................................................................................................................2 1.6 Assumptions ........................................................................................................................3 2. Methodology...................................................................................................................................4 2.1 Desktop assessment............................................................................................................4 2.2 Field survey..........................................................................................................................4 2.3 Desktop and field survey limitations ....................................................................................8 3. Existing environment....................................................................................................................12 3.1 Climate...............................................................................................................................12 3.2 Conservation areas............................................................................................................12 3.3 Regional biogeography......................................................................................................12 3.4 Vegetation and flora...........................................................................................................13 3.5 Hydrology...........................................................................................................................14 3.6 Geology and soils ..............................................................................................................14 3.7 Fauna.................................................................................................................................14 4. Field results..................................................................................................................................15 4.1 Vegetation and flora...........................................................................................................15 4.2 Fauna.................................................................................................................................23 5. Environmental approvals and referrals ........................................................................................30 5.1 Federal approvals ..............................................................................................................30 5.2 State approvals ..................................................................................................................32 6. References...................................................................................................................................34 Table index Table 1 Vegetation condition rating scale (Keighery 1994) ..............................................................6 Table 2 Field survey constraints and limitations .............................................................................10 Table 3 Broad vegetation association extents (GoWA 2015).........................................................13 Table 4 Vegetation associations.....................................................................................................16 Table 5 Extent of the TEC Eucalypt Woodlands of the Western Australian Wheatbelt within the Study area .........................................................................................................19 Table 6 Extent of vegetation condition ratings mapped within the Study area...............................21
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