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Report of a Level 1 Flora and Vegetation Survey Along South Western Highway, Padbury Hill

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Report of a Level 1 Flora and Vegetation Survey Along South Western Highway, Padbury Hill Report of a Level 1 Flora and Vegetation survey along South Western Highway, Padbury Hill Prepared for Main Roads Western Australia January 2016 PO Box 1180 Bunbury WA 6231 9721 1377 | [email protected] Ecoedge Review Version Origin Review release Issue date date approval V1 M. Strang R. Smith 18/12/2015 V2 R. Smith M. Strang 21/12/2015 Final N. McCarthy M. Strang M. Strang 22/12/2015 Draft (MRWA) Final M. Strang M. Strang 23/12/2015 Final_ M. Strang M. Strang M. Strang 08/02/2016 080216 2 | Page Executive Summary Ecoedge was engaged by Main Roads Western Australia (MRWA) in September 2015 to undertake a Level 1 Flora and Vegetation Survey of remnant vegetation along two sections of the South Western highway between 216.96 - 221.12 SLK, in the Shires of Donnybrook- Balingup and Bridgetown-Greenbushes. The survey was required as part of an investigation the future upgrade of a south bound climbing lane and north bound descending lane to improve traffic flow through an area of steep grades. The two road sections to be surveyed, referred to as the western and eastern survey areas, were 1.66 km and 1.92 km in length, respectively. In addition to the road sections, observations of the flora and vegetation within Lot 30 (abutting the road reserve) – made by viewing the site from within the road reserve boundary, without accessing the private property - were to be recorded. The Project Area totalled approximately 13.1 ha including the existing road formation and cleared areas, of which about 4.77 ha was remnant native vegetation. The field survey was undertaken on 15th September, 2015, in accordance with Environmental Protection Authority Guidance Statement No. 51 ““Terrestrial Flora and Vegetation Surveys for Environmental Impact Assessment in Western Australia”. One hundred and eleven species of vascular flora were identified within the Project Area, of which just over half (52) were introduced species, either naturalised or as part of amenity plantings. No Declared Rare Flora, Priority Flora, species of flora listed as Endangered under the EPBC Act or other flora of conservation significance were found within the Project Area. Four vegetation units were recognised within the Project Area (A, B, C and D). Vegetation units A, B and C were dominated by native species while the unit D was mostly comprised of introduced pasture or annual weed species with scattered trees. Observations were made of the vegetation of Lot 30 (private property), which lies at the western end of the Project Area, south of the highway. Lot 30 is comprised of pasture with an overstorey of Eucalyptus rudis (Flooded Gum) in places, and, at its eastern extent, planted eucalypts adjacent to the highway. The vegetation was completely degraded Almost 90% of the 13.1 ha Project Area was classed as “Completely Degraded” or “Degraded”, and another 1.9% was comprised of plantings of amenity species. Only about 4% of the Project Area, mostly in the eastern Project Area, was in “Good” or “Very Good” condition. 3 | Page In regards to the conservation significance of the vegetation, Vegetation unit A is part of the Balingup Vegetation Complex which is poorly represented in formal and informal nature reserves, although it meets the target of 30% remaining of pre-European area. Most of the Vegetation unit A was classed as “Completely Degraded” or “Degraded”, and therefore it has low conservation value. Vegetation unit B is “Completely degraded” or “Degraded”. It occurs within both the Hester and Balingup Vegetation Complexes. The Hester Complex exceeds the 30% target for pre- European area remaining and 15% in formal and informal reserves. Unit C occurs within the Hester Vegetation Complex which is extensive and well represented in the conservation estate. None of the vegetation units resembles a Threatened or Priority Ecological Community. 4 | Page Contents Executive Summary ................................................................................................................................. 3 Statement of limitations ......................................................................................................................... 7 Reliance on Data ................................................................................................................................. 7 Report for Benefit of Client ................................................................................................................. 7 1 Introduction .................................................................................................................................... 8 1.1 Scope and objectives .............................................................................................................. 8 1.2 Biogeographic region .............................................................................................................. 9 1.3 Site location and features ....................................................................................................... 9 1.4 Geology ................................................................................................................................... 9 1.5 Vegetation ............................................................................................................................. 13 1.6 Threatened and Priority Ecological Communities................................................................. 17 1.7 Threatened and Priority Flora ............................................................................................... 18 2 Methods ........................................................................................................................................ 22 2.1 Desktop Study ....................................................................................................................... 22 2.2 Field Survey ........................................................................................................................... 23 2.3 Survey limitations ................................................................................................................. 23 3 Results ........................................................................................................................................... 24 3.1 Flora ...................................................................................................................................... 24 3.1.1 Environmental weeds ................................................................................................... 24 3.2 Vegetation ............................................................................................................................. 27 3.2.1 Vegetation Units ........................................................................................................... 27 3.2.2 Observations of the Vegetation in Lot 30 ..................................................................... 27 3.2.3 Vegetation Condition .................................................................................................... 32 3.2.4 Conservation Status of the Vegetation Units................................................................ 35 4 Discussion ...................................................................................................................................... 35 5 Conclusion ..................................................................................................................................... 36 6 References .................................................................................................................................... 37 Appendix 1. Protected Matters Search Tool Report .............................................................................. … Appendix 2. List of vascular flora found within the Project Area at Padbury Hill. ................................. … Appendix 3. Environmental Weeds found within the Project Area at Padbury Hill. ............................. … 5 | Page Table of Tables Table 1. Soil Mapping Units occurring within the Project Area. ........................................................... 13 Table 2. Description of Vegetation Complexes mapped as occurring within the Project Area (Mattiske and Havel, 1998). .................................................................................................................................. 14 Table 3. Vegetation Complexes present in the Project Area with regard to the EPA and Commonwealth retention targets (DEC 2007). .................................................................................... 14 Table 4. Beard Vegetation Associations of the Project Area assessed against the Statewide Vegetation Statistics (Government of Western Australia, 2014). ........................................................ 15 Table 5. Categories of Threatened Ecological Communities under the EPBC Act. ............................... 17 Table 6. Definitions of Declared Rare and Priority List flora (DPaW, 2015c). ....................................... 19 Table 7. Categories of Threatened Species under the EPBC Act (DotE, 2014c). ................................... 20 Table 8. List of Declared Rare and Priority List flora known to occur within 10 km of the Project Area. .............................................................................................................................................................. 21 Table 9. Vegetation condition ratings according to Keighery (1994). .................................................
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