Wetland Management Plan Lots 124, 125, 176, 177 Rendezvous Road, Vasse, 6280

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1 Vasse Property Pty Ltd Wetland Management Plan Lots 124, 125, 176, 177 Rendezvous Road, Vasse, 6280 May C Lord St Whiteman (08) (P) (08) (F) consulting@naturalarea.com.au

2 Vasse Property Pty Ltd Wetland Management Plan Lots 124, 125, 176, 177 Rendezvous Road, Vasse, 6280 May 2011 Report prepared for: Vasse Property Pty Ltd Report prepared by: Natural Area Consulting 99c Lord St Whiteman WA 6068

3 Wetland Management Plan Lots 124, 125, 176, 177 Rendezvous Rd Vasse Disclaimer Natural Area Consulting (NAC) have prepared this report for the sole use of the Client and for the purposes as stated in the agreement between the Client and NAC under which this work was completed. This report may not be relied upon by any other party without the express written agreement of NAC. NAC has exercised due and customary care in the preparation of this document and has not, unless specifically stated, independently verified information provided by others. No other warranty, express or implied is made in relation to the contents of this report. Therefore, NAC assumes no liability for any loss resulting from errors, omission or misrepresentations made by others. This document has been made at the request of the Client. The use of this document by unauthorised third parties without written permission from NAC shall be at their own risk, and accept no duty of care to any such third party. Any recommendations, opinions or findings stated in this report are based on circumstances and facts as they existed at the time NAC performed the work. Any changes in such circumstances and facts upon which this document is based may adversely affect any recommendations, opinions or findings contained in this document. No part of this document may be copied, duplicated or disclosed without the express written permission of the Client and NAC. Document Control Document: Wetland Management Plan Lots 124, 125, 176, 177 Rendezvous Rd, Vasse File: Vasse Property Pty Ltd Version Date Prepared by Reviewed by Approved by Draft 1 October 2010 Sue Brand (NAC) Aminya Ennis (DEC) Sue Brand (NAC) Draft 2 December 2010 Sue Brand (NAC) Aminya Ennis (DEC) Sue Brand (NAC) Draft 3 April 2011 Sue Brand (NAC) Aminya Ennis (DEC) Sue Brand (NAC) Final May 2011 Sue Brand (NAC) Aminya Ennis (DEC) Sue Brand (NAC) Natural Area Consulting Page 1

4 Wetland Management Plan Lots 124, 125, 176, 177 Rendezvous Rd Vasse Table of Contents Executive Summary... v 1.0 Introduction Tenure, Ownership, Vesting Zoning Use Infrastructure Wetland Significance Summary of Management Commitments Existing Natural Environment Climate Regional Context Geology, Geomorphology and Soils Hydrology Vegetation and Flora Fauna Carnaby s and Baudin s Cockatoos Western Ringtail Possum Ecological Linkages Disease Fire Existing Cultural and Social Value and Use Indigenous Heritage Potential Impacts and Threats Geology, Geomorphology and Soils Hydrology Vegetation and Flora Fauna Endangered Species Western Grey Kangaroo Other Natural Area Consulting Page 2

5 Wetland Management Plan Lots 124, 125, 176, 177 Rendezvous Rd Vasse 5.5 Ecological Linkages Disease Fire Cultural Heritage Community Use Management and Monitoring Commitments Geology, Geomorphology and Soils Hydrology Vegetation and Flora Caladenia procera Building Envelopes Revegetation & Rehabilitation Landscape Protection Area beyond Wetland Boundary Landscape Protection Area, within Conservation Category Wetland Boundary Public Open Space, within Resource Enhancement Wetland Revegetation Buffer, north of Lots 176 and Revegetation Methodology Monitoring Methodology Projected Timetable Completion criteria Weed Control Fauna Carnaby s and Baudin s Cockatoos Western Ringtail Possum Western Grey Kangaroo Other Ecological Linkages Disease Fire Cultural Heritage Community Use and Appreciation Implementation and Review Plan Responsibilities Natural Area Consulting Page 3

6 Wetland Management Plan Lots 124, 125, 176, 177 Rendezvous Rd Vasse 7.2 Community and Landowner Consultation Management Plan Implementation Risk Assessment Reporting and Auditing (Monitoring) of Management Plan Performance Plan Review and Term Funding Handover Arrangements Landscape Protection Area containing Conservation Category Wetland Area Designated Public Open Space Revegetation Buffer Northern Portion of Lots 176 and References Glossary and Acronyms Appendix 1: Approved Subdivision Lot Layout Appendix 2: Flora Species List Appendix 3: Revegetation Monitoring Record Form Appendix 4: Risk Assessment Natural Area Consulting Page 4

7 Executive Summary Natural Area Consulting (NAC) was contracted by Vasse Property Pty Ltd to prepare a wetland management plan for wetlands on Lots 124 and 125 Rendezvous Road Vasse as one of the subdivision requirements associated with the development. This plan covers only those wetlands on the lots 124 and 125, namely: Conservation category dampland on Lot 124 UFI Resource enhancement category wetland running across Lot 125 UFI It describes the characteristics of each of the wetlands, their values and the overall management aims and objectives. This plan also takes into consideration the revegetation requirements for the wetland areas, which is also a subdivision requirement. As a matter of convenience, it also includes the revegetation requirements for the buffer zone at top of Lots 176 and 177. A list of local native species has been provided to guide the revegetation process, along with suggested planting densities that consider existing vegetation on the site. Natural Area Consulting Page v

8 1.0 Introduction Natural Area Consulting (NAC) was contracted by Vasse Property Pty Ltd to prepare a management plan incorporating wetland management for wetlands on Lots 124 and 125 and revegetation management for Lots 124, 125, 176 and 177 Rendezvous Road Vasse (the site see Figure 1) as a subdivision requirement issued by the Western Australian Planning Commission (WAPC) to support the Development Guide Plan submitted for the site by RPS Koltasz Smith. It is intended to subdivide the site into 87 rural residential lots (see Appendix 1), with the expectation that the process will occur over an approximately 3 year period to allow a staged approach to provision of lots and associated management of subdivision impacts such as road construction, clearing and fencing. N Busselton Bypass Approx. site boundaries Figure 1: Site Location Plan (Source Image: NearMap, February 2010) Rendezvous Road Wetlands and their associated features are an important component of the natural environment, particularly those areas where wetland and dryland species interface. Wetland areas often support greater levels of biodiversity than dryland areas alone because of the range of species that can be supported in the differing conditions, thus they can be important habitats that need to be protected. As a low lying coastal area, Busselton and its surrounds contain a number of wetland areas, including those within the boundaries of Lots 124, 125, 176 and 177 Rendezvous Road, Vasse, as shown in Figure 2. Note that the portion of the multiple use wetland shown on Lot 176 is within a designated building and revegetation buffer area, and will otherwise be unaffected by the development. Natural Area Consulting Page 1

9 N UFI UFI 302 UFI Figure 2: Wetlands as identified by the DEC on Wetlands Base (accessed 04 May 2010) An application to make adjustments to the Geomorphic Wetlands of the Swan Coastal Plain dataset in relation to the conservation category sumpland (UFI 13178) and the multiple use wetland immediately to the east of the sumpland (UFI 303) located on Lot 124 has resulted in a decision by the DEC to: Adjust the wetland classification of UFI from a sumpland to a dampland, Adjust the boundary of UFI from that shown in Figure 2 to that shown in Figure 3, Consider the what was the eastern portion of UFI dryland, and Consider that portion of the multiple use category wetland (UFI 302) shown as occurring in Lot 124 to be dryland (refer Figure 3). During the assessment process, the DEC and the Department of Water (DoW) also opted to review the current assessment of that portion of the linear wetland across the southern portion of Lot 125 (UFI 13196), which was listed as a multiple use wetland. The decision was made to increase the management category of that portion of the wetland traversing Lot 125 to resource enhancement. This adjustment will not impact on the proposed development as the Development Guide Plan was approved by the WAPC prior to the wetland reassessment taking place. Natural Area Consulting Page 2

10 Figure 3: Wetlands on Lots 124 and 125 as reassessed by the DEC on 31 May 2010 Note that wetland areas covered by this management plan are only those on Lots 124 and 125 Rendezvous Road Vasse, namely: Conservation category dampland within Lot 124 UFI Resource enhancement wetland (management category changed May 2010) across the southern portion of Lot 125 UFI The requirements for the preparation of a Wetland Management Plan are outlined in the Department of Environment and Conservation s Guidelines Checklist for Preparing a Wetland Management Plan for Development, Subdivision or Scheme Amendment Approvals, or Local Government Development Applications (2008). The purpose of the Wetland Management Plan is to inform and guide: Rehabilitation and/or revegetation activities within each of the wetland boundaries, and Ongoing management of the wetland areas during the time the developers retain responsibility for the area, expected to be a period of two years. 1.2 Tenure, Ownership, Vesting Ownership of the lots within the site is as follows: Lot 124 Rendezvous Road on Deposited Plan 60066, Volume 2697 Folio 181 is currently owned by Mr Terrence Germain, and is currently in negotiations with Vasse Property Group Pty Ltd to sell all of what is currently Lot 124 except for that portion shown as Lot 2 on the Development Guide Plan approved by the WAPC in January Thus while this application has been prepared on behalf of Vasse Property Group, it is made with Mr Germain s knowledge and support. Natural Area Consulting Page 3

11 Lot 125 Rendezvous Road on Deposited Plan 60066, Volume 2697 Folio 182 is owned by Vasse Property Pty Ltd. Lot 176 Rendezvous Road on Plan 4918 Volume 996 Folio 122 is owned by Vasse Property Pty Ltd. Lot 177 Rendezvous Road on Plan 4918 Volume 2645 Folio 800 is owned by Vasse Property Pty Ltd. When the subdivision proceeds and the Lots as shown on the approved Development Guide Plan come into effect, ownership of all lots with the exception of what will become Lot 2 will rest with Vasse Property Pty Ltd; ownership of Lot 2 will be retained by Mr Germain. In time, it is expected that the Landscape Protection Area will be ceded to the Crown for the purposes of conservation, as per Section 152 of the Planning and Development Act, 2005 (WA), for vesting with an appropriate body for ongoing management, as decided by the WAPC. The areas designated Public Open Space will be rehabilitated using appropriate species and eventually ceded to the Shire of Busselton. 1.3 Zoning The land within the site is currently zoned as rural residential under the Shire of Busselton s Town Planning Scheme No. 5. The current Development Guide Plan endorsed by the WAPC in January 2010 (refer Appendix 1) includes the provision for no further subdivision to occur on the Lots. 1.4 Use Current land use on Lots 124 and the southern portion of Lot 125 is primarily as the residence of Mr T. Germain and his family. Mr Germain has allowed the vegetation on these lots to regrow since purchase of the property in Part of Lot 125 and Lots 176 and 177 are cleared and have been used for grazing land. When the subdivision is finalised and the lots are readied for sale, all lots except those designated landscape protection or public open space will no longer be used for grazing. Lot sizes are designed as rural residential, with vegetated lots being larger in size than those in cleared areas. It is a subdivision requirement that vegetated lots will have a maximum building envelope of 2000 m 2 specified during the subdivision process. 1.5 Infrastructure Current infrastructure on Lots 124 and 125 is limited to existing dwellings and other ancillary buildings associated with Mr Germain s tenure and ownership, as shown on Figure 2. Future infrastructure will include: Roads, Sewerage, Power and communications, Water, and Residential buildings. The Development Guide Plan (DGP) endorsed by the Western Australian Planning Commission (WAPC) shows the accepted lot layout and associated conditions for subdivision Natural Area Consulting Page 4

12 (see Appendix 1). The portion of land where the conservation category wetland is located has been designated as landscape protection. As indicated at condition 3 of the subdivision requirements, lots within the vicinity of the conservation category wetland (CCW) (UFI 13178) are larger, vegetated lots that will have building envelopes specified. A buffer will exist around the CCW where no development, clearing or other works can occur. The multiple use wetland identified as UFI has been identified by the DEC on Wetlands Base (see Figure 2) as a portion of the Busselton floodplain. It has been designated on the DGP as public open space and will serve a dual function as drainage for larger rainfall events. 1.6 Wetland Significance Both wetlands (UFI and 13196) on the site are in a less than pristine condition, with impacts to hydrology and associated vegetation occurring as a result of: Installation of the Vasse Diversion Drain, designed to drain water from the low lying areas of the Swan Coastal Plain near Busselton. It should be noted that the diversion drain extends beyond the shallow, superficial aquifer around Busselton into the deeper, Yarragadee aquifer (Woodward, Personal Communication, 2009). Drying climate, which could be attributable to climate change. Installation of the Busselton Bypass acting as a barrier between the site and the coastal fringe. The DEC Wetlands Branch (2010, personal communication) considers the dampland on Lot 124 to be significant because it: is representative of damplands in the Ngamburnup consanguineous suite, is recognised in the South West Regional Ecological Linkages (SWERL) project, and vegetation is in good condition with few weeds. The reasons the DEC Wetlands Branch (2010, personal communication) provided to support the adjustment of the management category on the wetland on Lot 125 from multiple use to resource enhancement are: the area supports a mature stand of Melaleuca rhaphiophylla and saplings, indicating that natural recruitment is occurring, crown cover is estimated at greater than 70%, and that while vegetation is degraded, it retains sufficient ecological function and potential for enhancement. Natural Area Consulting Page 5

13 2.0 Summary of Management Commitments The developers commit to the following in relation to the management of wetlands on the site: To retain those areas designated as landscape protection and public open space in perpetuity to allow for continued wetland function and the provision of habitat for fauna species. In time, it is expected that the Landscape Protection Area will be ceded to the Crown for the purposes of conservation, as per Section 152 of the Planning and Development Act, 2005 (WA), for vesting with an appropriate body for ongoing management, as decided by the WAPC. The area designated Public Open Space will be rehabilitated using appropriate species and eventually ceded to the Shire of Busselton. To undertake appropriate revegetation activities on the wetland sites to improve their condition and enhance their suitability as habitat over time for use by various fauna species, including the Western Ringtail Possum and the Carnaby s Cockatoo. It is expected that revegetation activities will commence in winter of 2011 after the first significant winter rains to maximise the potential for seedlings to become established. Fence the perimeter of the Lot containing the conservation category wetland to reduce uncontrolled access by people, vehicles and kangaroos as a means of enhancing the conservation values at the site in the longer term. Undertake vegetation monitoring during spring and autumn each year for a period of three years to review the success of ongoing management and revegetation activities, and determine whether or not there is a need for further infill planting, with results being reported to the DEC on an annual basis. It is expected the first monitoring period will occur in spring 2011 to provide the baseline conditions after the commencement of revegetation conditions. It should be noted that the above commitments will cease at the time the developers no longer have responsibility for the sites, with the nominated authorities taking over responsibility for ongoing management, monitoring, and similar. This is expected to occur after a three year period, in accordance with DEC and Shire of Busselton requirements relating to revegetation activities. Management of geology, geomorphology and soils will revolve around: Clearing will only occur in areas where roads, service corridors or fence lines are to be installed, and Any stockpiling of soil material will occur in already cleared areas, rather than vegetated areas. Natural Area Consulting Page 6

14 3.0 Existing Natural Environment When preparing management plans, it is necessary to be aware of and consider the characteristics of the natural environment. This section describes the key environmental characteristics that could potentially influence outcomes of this plan. 3.1 Climate The climate of the Busselton region is typical of the Swan Coastal Plain. It can be described as Mediterranean, characterised by cool, wet winters and hot, dry summers. Statistics available from the Bureau of Meteorology (2010) indicate the following: Average maximum temperatures range from 16.3 o C in winter to 28.5 o C in summer, Average minimum temperatures range from 7.5 o C to 14.0 o C, Average rainfall is 810 mm per year, with approximately half of that falling during winter months, and Average Humidity ranges from 50% in summer to 81% in winter. Potential climate change impacts in the vicinity of Lots 124 and 125 Rendezvous Road Vasse include: A drying climate with the potential to result in further decline in groundwater levels and associated groundwater dependent ecosystems, and Increased frequency of storm events. The Busselton Bypass will, to some extent, act as barrier to coastal flood and/or storm surge events. Reduced rainfall within the catchment combined with the presence of the Vasse Diversion Drain will mean that potential flooding from the Vasse River is not likely. 3.2 Regional Context The Rendezvous Road site is located in the most southerly portion of the Swan Coastal Plain 2 (SWA2) subregion of the Interim Biogeographic Regionalisation for Australia (Mitchell, Williams, and Desmond, 2002), near Busselton. The area is not currently covered by a management plan. The wetlands on site are not wetlands of international, national, regional or local significance, nor are they in an area considered to be a biodiversity hotspot. 3.3 Geology, Geomorphology and Soils According to the Busselton 1:50,000 Environmental Geology Sheet, the site is located on the Bassendean sands of the Swan Coastal Plan, however, the Shared Land Information Platform Natural Resource Management website indicates the soil is better described as Spearwood Sands (refer Figure 4). The topography of the site is flat, with a shallow gradient from the south towards the coast (north). Natural Area Consulting Page 7

15 N Lot 124 Rendezvous Rd, Vasse Figure 4: Soil Type, Rendezvous Road, Vasse (SLIPs, 2010) The Busselton 1:50,000 Environmental Geology sheet also indicates that the shallow subsurface conditions beneath the site comprise sands derived from Tamala Limestone overlying clayey materials. A preliminary geotechnical investigation was undertaken in October 2007 by Douglas Partners Pty Ltd and confirmed the subsurface geology comprises sands overlying clayey materials. Similar findings were made during the installation of groundwater monitoring bores by Dr Colin Walker (2009). The following summarises the soil information encountered by Douglas Partners during their 2007 survey: Topsoil dark brown silty sandy topsoil with some rootlets to depths of m; Silty sand medium dense, grey silty sand to depths of m across the majority of the site, the exceptions being locations TP8, TP10 and TP18; Sand medium dense, yellow brown and grey sand to depths between 0.60 m and test pit termination depth (commonly 2.0 m); Clayey sand medium dense, yellow brown to grey clayey sand and sand with some clay was observed at depths of 0.90 m and termination depth at TP1 (1.0 m) and TP2 (2.0 m); Sandy clay firm to stiff, yellow brown mottled grey sandy clay was observed at depths of 1.7 m to termination depth at TP16 (2.1 m), TP17 (2.2 m), TP19 (2.2 m) and TP20 (2.6 m); Clay very stiff, grey clay was from 2.1 m depth at TP20. No soil impacts within and adjacent to the management area have been identified during the various environmental and other investigations that have been carried out on site. Preliminary field investigations were carried out to assess the potential for acid sulphate soils being present on site, with the results indicating the likelihood was low (refer Walker, 2009). More in depth investigations will be carried out for locations where sub surface infrastructure such sewer lines will be placed. Natural Area Consulting Page 8

16 3.4 Hydrology Hydrology at the site is characterised by the presence of a shallow aquifer. Depth to water table varies according to the season, the amount of annual rainfall, and the normal surface on site. As a generalisation, depth to groundwater is greater: towards the southern portion of the site and lower towards the north; during wetter months after recharge by rainfall; and when the amount of annual rainfall is below average levels received at the site. 3.5 Vegetation and Flora The majority of the vegetation on Lots 124 and 125 Rendezvous Road has been allowed to grow since Mr Germain purchased the property in Prior to that time, the land was cleared and had similar uses to surrounding areas. The vegetated areas have had a number of investigations carried out to identify species present, whether or not there are rare or endangered species present, and vegetation condition. Studies include: Vegetation Condition Survey Report (Brand, 2008), Environmental Site Assessment Lots 1444, 176, 177 Rendezvous Road, Busselton (Walker, 2007a), Flora Survey and Environmental Assessment Lot 123 Rendezvous Road, Busselton (Walker, 2007b), Report on Flora Survey of Lots 123, 1444, 176, 177 Rendezvous Road, Busselton (Ekologica Pty Ltd, 2008). The outcomes of these studies have shown: The site contains two major vegetation types, namely: o woodland dominated by Corymbia calophylla (Marri) and Eucalyptus marginata (Jarrah) with Agonis flexuosa (Peppermint), Banksia grandis and Banksia attenuata and Peersonia longifolia, and o woodland in damp swales dominated by Corymbia calophylla (marri), Eucalyptus rudis (Flooded gum) with Agonis flexuosa, Banksia littoralis, Melaleuca preissiana and Melaleuca raphiophylla (Paperbark), Some 116 flora species, primarily under storey species, have been found on site (refer Appendix 2), The Carbunup King Spider Orchid, (Caladenia procera) (critically endangered EPBC Act 1999 (Cwlth), declared rare flora Wildlife Conservation Act 1950 (WA), occurs within the road reserve to the south of the site, however none have been found in within the site boundaries during recent surveys, That the vegetation condition across much of the site is degraded and in poor condition, There are a few areas where vegetation is in good condition, There are a large number of dead or dying trees on the site, There is little middle or understorey present on the site, There are numerous types of fungi present within the vegetated area, and The site contains many weeds, including the Arum Lily (Zantedeschia aethiopica). Natural Area Consulting Page 9

17 3.6 Fauna Fauna known at the site include the: Western Grey Kangaroo, Western Ringtail Possum (vulnerable EPBC Act 1999 (Cwlth), rare or likely to become extinct Wildlife Conservation Act 1950 (WA)), Carnaby s Black Cockatoo (endangered EPBC Act 1999 (Cwlth), rare Wildlife Conservation Act 1950 (WA)), Baudin s Black Cockatoo (vulnerable EPBC Act 1999, rare or likely to become extinct Wildlife Conservation Act 1950 (WA)), along with Rabbits, the occasional fox, and other local bird species Carnaby s and Baudin s Cockatoos According to the Department of Environment, Water, Heritage and the Arts (DEWHA) (Slade, 2010, personal communication), potential breeding habitat for cockatoos is considered to be woodland stands of 0.5 ha or more that contain three or more breeding trees, such as Eucalyptus wandoo (Wandoo), Eucalyptus lane-poolei (Salmon Gum), Eucalyptus gomphocephala (Tuart) or Eucalyptus marginata (Jarrah) with a diameter at breast height of greater than 500 mm. A survey targeting cockatoo use of the site was undertaken by Harewood (2008a) and found that while the Baudin s Black cockatoo was the more common species to visit the site, there was no evidence of the birds roosting or nesting within the study area. The surveys carried out by Ecosystem Solutions (2009) indicated that no cockatoos were seen or heard, and no evidence of feeding or roosting sites found. Flora surveys conducted on the site found food sources used by the endangered Carnaby s Cockatoo (Calyptorhynchus latirostris) and the Baudin s Black Cockatoo (Calyptorhynchus banksii naso). The majority of food species are found in the well vegetated areas of Lots 124 and 125. However, the age of the regrowth at just over 20 years (max.) means that they are unlikely to have developed hollows suitable for nesting. Some of the more mature trees on Lots 176, 177 and 125 may have hollows Western Ringtail Possum The Busselton area is also known for the presence of the threatened Western Ringtail Possum (Pseudocheirus occidentalis). Surveys undertaken at the site revealed a small number of possums are using some of the vegetated areas along the road reserve with a few transient animals found around Mr Germain s home (Harewood 2007, 2008b; Ecosystem Solutions, 2009). The sparse nature of the vegetation and lack of undergrowth means that the possum is unlikely to find other portions of the site suitable as habitat (Harewood, 2007; Ecosystem Solutions Pty Ltd, 2009). 3.7 Ecological Linkages According to Molloy, Wood, Hall, Wallrodt, and Whisson (2009), an ecological linkage is considered to be A series of (both contiguous and non contiguous) patches which, by virtue of their proximity to each other, act as stepping stones of habitat which facilitate maintenance of ecological processes and the movement of organisms within, and across, a landscape. Natural Area Consulting Page 10

18 On the basis of information provided by the DEC, the Rendezvous Road site is considered to be an ecological linkage because of its proximity to other vegetated areas that can act as a stepping stone to assist with the movement of fauna species from one location to another (refer Figure 5). Figure 5: Ecological Linkages in Vicinity of Rendezvous Road Site (Source: Molloy et al, 2009) It should be noted, however, that while Lots 124 and 125 appear to contain significant amounts of vegetation when viewing aerial photographs (refer Figure 1, Appendix 1), the lack of under and middle storey species and generally poor condition of the vegetation on site (refer Figure 6) mean the value of the vegetation as an ecological linkage is low for species such as the Western Ringtail Possum, which rely on the under and middle storey for safe passage. Aerial photographs show vegetated areas along the Rendezvous Road verge and on properties to the south of the site, and which were assessed by Harewood (2008b) as to their potential use by the Western Ringtail Possum. His findings include: Remnant vegetation on Lot 19 Rendezvous Road is similar to that present on Lot 124 (then Lot 123), and is similarly degraded with a lack of under and middle storey species, Connectivity between the vegetated areas is poor as a result of the spacing between the trees and the cleared areas, and The road verge between Queen Elizabeth Drive and Kaloorup Road probably provides the most suitable ecological linkage in the area for the Western Ringtail Possum. Natural Area Consulting Page 11

19 Figure 6: Lot 124 Rendezvous Road poor vegetation health and lack of under and middle storey species The use of the vegetated areas on site by smaller birds such as honey eaters and robins, includes roosting, nesting and for food. Occasionally, the site is visited by Carnaby s and Baudin s Cockatoos when foraging for food or roosting. The site is close to the former Broadwater Reserve, which is listed on the Register of the National Estate (Place ID 9479) because it supports a large number of waterbirds. However, the lack of surface water at the Rendezvous Road site suggests that the value as an ecological linkage for those species is limited. 3.8 Disease While no disease is apparent on site, Phytophthora dieback is a possibility as infections are known in areas close to the site. Discussions with the DEC (Blankendaal, 2011, personal communication) indicate that the largely degraded condition of the vegetation mean that the area would be very difficult to undertake dieback interpretation activities on. Accordingly, no detailed investigations are planned for the site. 3.9 Fire While fire has occurred on the site with limited impact because of the lack of under and middle storey plant species. The last known fire probably occurred some five+ years ago. The amount of dead leaves and other materials that could provide a fuel source are limited. A fire break exists around the perimeter of the lots on which the wetlands exist (refer Figure 2). No individual fire breaks are envisaged around individual lots. A fire management plan has been prepared for the planned subdivision, and was submitted to the Western Australian Planning Commission (WAPC) for consideration as part of the Development Guide Plan approvals process. Natural Area Consulting Page 12

20 4.0 Existing Cultural and Social Value and Use The current land tenure of the lots containing the wetlands is private property originally owned by Mr Germain, and now owned by Mr Germain and Vasse Property Pty Ltd. Lot 124 and a portion of the surrounding area was used by the military during World War 2, and a radio bunker was constructed on the site. The bunker is used by Mr Germain primarily for storage purposes, and is not open to the public. Accordingly, there has been no cultural or social use of the area other than that of Mr Germain and his family. 4.1 Indigenous Heritage Areas in and around Busselton are known to have significance to local Aboriginal groups. A search of the Aboriginal Heritage Inquiry System (AHIS) hosted by the Department of Indigenous Affairs (DIA) (2010) has a number of registered Aboriginal Heritage sites in the vicinity of Lots 124, 125, 176 and 177 Rendezvous Road, but none within the boundaries (refer Figure 7). DIA Registered Aboriginal Heritage Sites Site boundary N Figure 7: Registered Aboriginal Heritage Sites in Vicinity of Rendezvous Road A check of ethnographic and archaeological surveys recorded on AHIS for the region reveals a number of surveys that have considered all or portions of Lots 124, 125, 176 and 177 Natural Area Consulting Page 13

21 Rendezvous Road have been carried out (refer Figure 8). While this would suggest that no artefacts or similar have been found on the site, it does not preclude the potential for items to be found in the future. Site boundary Figure 8: Areas where Ethnographic or Archaeological Surveys have been carried out Natural Area Consulting Page 14

22 5.0 Potential Impacts and Threats The installation of infrastructure including roads, pipes and buildings will result in some impacts within the overall site; however impacts to the wetland areas will be relatively minor. In order to assess potential impacts and then suggest management strategies, it is useful to carry out a risk assessment of potential impacts that occur. Outcomes of the risk assessment process carried out during the development of this management plan are provided in Appendix 3. The outcomes have been used to identify potentially significant impacts and strategies that will be used to limit potential damage during development of the subdivision. 5.1 Geology, Geomorphology and Soils The flat nature of the area and the limited suitability for sub surface infrastructure due to the shallow depth to groundwater will mean that disturbance to geology, geomorphology and soils will be kept to a minimum. Some disturbance will occur during the installation of services, particularly sewerage pipes below ground, and during road construction requiring some clearing of vegetation and fill with clean sand. 5.2 Hydrology The design of the subdivision has taken particular care to adequately consider surface and groundwater interactions and how they can be managed. No impacts are expected to hydrology in the vicinity of UFI as this area has been set aside a reserve for landscape protection. There will be some impact in and around UFI as this area has been designed to accommodate stormwater from significant rainfall events, which will require some movement of soil and clearing of vegetation during implementation of the works. Other impacts from stormwater are expected to me minimal as the site is designated rural residential, with larger lots allowing greater rates of infiltration from rainfall rather than creating significant levels of overland flow. 5.3 Vegetation and Flora While there will be some impacts to vegetation and flora during the installation of roads, with areas needing to be cleared for roads, sewer and building infrastructure, an assessment of vegetation condition and the lack of under and middle storey species indicates that impacts will be kept to a minimum. Building envelopes have been nominated for the southern portion of the site, taking into consideration the location of wetlands, vegetation in good condition, and the presence of the critically endangered Caladenia procera in the road reserve. The approved development guide plan shows the maximum expected buffer of 200 m around the orchid population, however a buffer of between m was agreed with the DEC in June 2010, with the actual distance being 71.6 m, coinciding with the western boundary of the area to be reserved as landscape protection (refer Appendix 1). As is apparent from the plan shown in Appendix 1, the orchid population is unlikely to be directly impacted by on site activities as no roads or other infrastructure is planned within or immediately beyond the agreed buffer. Natural Area Consulting Page 15

23 As the orchid population occurs within the road reserve, protection measures will need to be implemented by the Shire of Busselton, who is responsible for maintaining Rendezvous Road, to prevent disturbance. Similarly, Western Power will need to ensure power line maintenance and trimming of trees beneath power lines is undertaken in a manner to prevent negative impacts on the population during routine maintenance or other activities. 5.4 Fauna The majority of fauna species using the site are likely to benefit from the subdivision, particularly due to planned rehabilitation and revegetation activities. Species considered to be pests will be impacted through active rather than the passive management that has historically occurred Endangered Species As the current usage of the site by endangered species (i.e.: Carnaby s and Baudin s Cockatoos and the Western Ringtail Possum), is low, impacts during construction are also expected to be low, particularly within vegetated areas of the lots and specifically within designated wetland areas Western Grey Kangaroo The Western Grey Kangaroo is known to utilise the proposed subdivision site for food, water and resting, however, their presence can be considered to be a nuisance species with numbers needing to be controlled on occasion. Impacts will revolve around controlling kangaroo numbers and limiting the areas they can access Other Local bird species are unlikely to be significantly impacted during construction activities. Rabbits are a pest species that can cause significant environmental damage through the development of their burrows (refer Figure 9). As the subdivision development proceeds, areas that the rabbit can inhabit will be reduced. Figure 9: Rabbit burrow, Conservation Category Wetland Site Natural Area Consulting Page 16

24 5.5 Ecological Linkages As current ecological linkages are limited, impacts during construction will also be limited. Some vegetation along the eastern boundary of the Lot designated landscape protection will be lost when the main access road to the subdivision from Rendezvous Road is constructed. No other impacts within the vicinity conservation category wetland are expected. A small amount of vegetation will also be lost when roads are constructed around the area designated Public Open Space and for driveways on lots towards the middle of the subdivision (refer Appendix 1). Vegetation loss from these areas is not likely to impact on use by cockatoos as flora species present include few that are used as a food source. Similarly, impacts to possums visiting the site are expected to be limited. 5.6 Disease The disease likely to be of greatest concern at the site is Phytophthora dieback. According to Blankendaal (2011, Personal Communication), the Department of Environment and Conservation indicate that no assessment for the occurrence of Phytophthora species has occurred at the site, Phytophthora has been found in remnant vegetation and in major drainage lines to the east and south of the site, meaning its presence at the site is a possibility, and Mapping the occurrence of Phytophthora at the site is not possible due to the degraded condition of the vegetation throughout the majority of the site. In addition to the above, geotechnical investigations and the installation of groundwater monitoring bores at the site have shown the presence of limestone with the soil, which is known to mitigate against the development of Phytophthora disease Given the nature of the site and the possibility that Phytophthora is present, it is considered to have a medium risk, as described by the Dieback Working Group (2000). On this basis, the following will be implemented by the Developers during the various subdivision activities: Landscape Protection Area o Will be treated as protectable, or that the area is assumed to currently have some impact from Phytophthora, and that activities will be carried out in and around the site in a manner that reduces the potential for Phytophthora dieback to be introduced from secondary sources; o Area will be fenced to prevent/limit access by people, animals and other machinery; o No topsoil or material removed from locations within the overall site will be stockpiled within the landscape protection area; o Gravel, soil, sand and other materials brought in to the site for road construction and similar will not be stored or stockpiled within the landscape protection area; and o Fire break installation will not occur in areas beyond the current location. Other areas All other areas on site will be treated as unprotectable, or that while the area will is assumed to have some impact from Phytophthora currently, future site activities such as the installation of roads, drainage, services and regular human and vehicle movement will mean that the potential for Phytophthora dieback entering the site from other sources will increase, meaning that the likelihood of protecting the area from infestation Natural Area Consulting Page 17

25 in the longer term is low. Accordingly, no particular protection mechanisms will be required at the site. 5.7 Fire Fire risks within the site boundaries, including the wetland areas will be low during construction and development at the subdivision stage. A firebreak exists and is maintained around the site in accordance with the approved Fire Management Plan (South West Fire Services, 2009). 5.8 Cultural Heritage The site has no known Aboriginal or European cultural heritage values, thus no impacts are expected. There is the possibility that cultural heritage values will improve in the longer term as a result of the subdivision as the areas designated landscape protection and public open space contribute to conservation and passive recreational activities within the community. However, these are not likely to occur within the period the developers are responsible for the site. 5.9 Community Use As the current human use of the site is limited to Mr Germain and his family, community impacts will be minimal. The construction of the northern road along the boundary of Lot 125 and 179 to the north of the site (refer Appendix 1) has the potential to impact on the owner/occupier of Lot 179 through the generation of noise and dust. Construction of this particular road is not expected to occur until later stages of subdivision development, and will not impact on designated wetland areas within Lots 124 and 125. Natural Area Consulting Page 18

26 6.0 Management and Monitoring Commitments 6.1 Geology, Geomorphology and Soils The flat nature of the site and subdivision design mean that impacts to geology, geomorphology and soils will be minimal. Accordingly, management will revolve around ensuring: Clearing will only occur in areas where roads, service corridors or fence lines are to be installed, and Any stockpiling of soil material will occur in already cleared areas, rather than vegetated areas. 6.2 Hydrology Management of surface and groundwater hydrology have been detailed in the Local Water Management Strategy (SMEC Urban, 2010) approved by the Department of Water in March 2010 (Department of Water, 2010). Management strategies have been refined in the Urban Water Management Plan prepared by Natural Area Consulting and Wood & Grieve Engineers (2010). Monitoring commitments are detailed in the documents mentioned above and will continue as outlined. They include undertaking semi annual water quality monitoring of groundwater during winter and summer at a range of monitoring locations across the site, including within the conservation category wetland and the within the area designated public open space. In the event surface water occurs on the site as a result of significant rainfall, storm event or flooding, episodic monitoring will be undertaken. 6.3 Vegetation and Flora As the proposed lots are zoned rural residential, further clearing of vegetation is expected to be kept to a minimum. A number of general management strategies that will assist with protecting the vegetated areas within the landscape protection area and the designated public open space will be implemented, including an indication on the endorsed DGP that no further subdivisions will be permitted (Site Requirement 2). Specific management strategies are provided in this section Caladenia procera While it is recognised that the Shire of Busselton will have the primary responsibility for preservation and management of the orchid population because it occurs within the road reserve of Rendezvous Road, the developers are committed to protecting the Caladenia procera population from impacts during subdivision and future activities. The developers are also committed to protecting any populations that may occur within Lot 124 Rendezvous Road for that time period they retain responsibility for the land in question, typically a two or three year period until relevant lots or sold and handover of reserve areas to relevant authorities (e.g.: Shire of Busselton). In order to maintain s suitable buffer distance around the population within the road reserve and protect plants that propagate within Lot 124, the following will be implemented: In consultation with the DEC, identifying a buffer zone of 71.6 m from Rendezvous Road, intersecting the boundary of the landscape protection zone where it bends to Natural Area Consulting Page 19

27 towards the north east (Webb, 2010, personal communication), where no building or development can occur as per Site Requirement 5 shown on the endorsed DGP. Specifying building envelopes of a maximum 2000 m 2 at the building licence stage for Lots 1, 3 10, as per Site Requirement 4 of the endorsed DGP. Including a requirement on title documents for Lots 1 and 3 that building envelopes will not occur within the orchid s nominated buffer zone. Reserving the area containing the conservation category wetland as landscape protection. Ensuring the firebreak remains at its current location and advising future owners of that requirement. Ensuring boundary alignments of buffers, reserves and similar are clearly demarcated in the field and fenced prior to the commencement of more extensive clearing during subdivision/development works. Fencing the designated landscape protection area with suitable materials to provide protection from uncontrolled access by humans, vehicles and kangaroos. Note that fencing materials used will be consistent with those recommended in the Kangaroo Management Plan (Natural Area Consulting, 2011). Developing and implementing a rehabilitation/revegetation plan designed to improve the vegetation condition and structure within the designated landscape protection area, which should increase the potential for the orchid to occur in areas beyond the road reserve with a higher level of protection (see section below). If required, translocation of the population will be considered after suitable discussions and agreement with the DEC and the Shire of Busselton. Considered collectively, the above strategies will provide an area of approximately 8 ha where vegetation will be retained on the site and contribute to protection of the orchid and other environmental values on site. In addition, the Shire of Busselton and Western Power have been made aware of the approximate location of the population and noted it on relevant systems (Oldfield, 2010 (Personal Communication); Morgan, 2010 (Personal Communication)). Oldfield (2010, Personal Communication) has indicated that the population has been recorded on the Shire GIS database, so if there is a need for road maintenance, widening, or similar, a check of the system will show the presence of the population and appropriate protection mechanisms implemented. Morgan (2010, Personal Communication) has advised relevant sections within Western Power of the location of the population and that it is to be considered as an environmentally sensitive area (ESA), with appropriate procedures to be implemented as and when maintenance or other works are required on the power lines Building Envelopes One means of ensuring the retention of as much vegetation as possible with Lots 124 and 125 particularly, is to specify building envelopes where residences and associated outbuildings such as sheds and garages can be located. Site Requirement 4 on the endorsed DGP indicates that building envelopes will be specified for Lots 1, 3 10 during the building licence stage. Building envelopes will take into consideration the vegetation condition within the proposed lot. An additional Site Requirement for Lot 4 is that development must occur in the northern portion of the Lot, further increasing the area of vegetation on the southern portion of the project to be retained. Natural Area Consulting Page 20

28 6.4 Revegetation & Rehabilitation The developer is committed to planning and implementing rehabilitation and revegetation activities within the landscape protection area, the public open space area and the designated revegetation buffer zone to the north of the site as part of the subdivision conditions (refer Subdivision Requirement 7). Each area has distinct requirements that will be discussed separately within this section. A comprehensive list flora species suited to the overall site has been compiled from the results of flora and vegetation surveys carried out by Dr Walker (2008) and Ekologica (2009), observations by DEC officers from Busselton and the Wetlands Branch in Perth, and the list of preferred species provided by the Shire of Busselton (see Table 1 in Appendix 2). Within the designated boundaries of wetland areas, only those species that tolerate damp conditions are recommended, rather than those that prefer wet conditions. A list of species suited to wetland areas has been provided in Table 2 of Appendix 2, with an indication of those that prefer damp conditions and thus will be preferable for rehabilitation activities within the landscape protection area and public open space. It is recommended that weed control activities be undertaken at each location where revegetation activities are to occur. This would typically involve two applications of the appropriate herbicide for the target species applied some six weeks apart, with planting occurring at least three weeks after the second application Landscape Protection Area beyond Wetland Boundary The landscape protection area beyond the boundary of the conservation category dampland (UFI 13178) will include dryland varieties only. Revegetation and rehabilitation activities will include: In fill planting with species suited to the dryland conditions to achieve an overall final density of one plant per square metre (i.e.: includes current vegetation present on site), with suitable species listed in Table 1 of Appendix 2. Replanting with dryland tree (over storey) species at a density of one per 10 m 2 to assist with the reestablishment of over storey species. Replanting with dryland under and middle storey species at a density to achieve an overall plant density of 1 per square metre. Ensuring replanting activities include the Agonis flexuosa to assist with habitat restoration for the Western Ringtail Possum. Ensuring replanting activities include species suited to provide additional habitat for the Carnaby s and Baudin s Cockatoos, particularly Banksia attenuata, Banksia grandis, Banksia littoralis, Corymbia calophylla, Eucalyptus marginata, and Hakea varia. The current driveway used by Mr Germain to access his property from Rendezvous Road will be removed when alternative access is provided through the construction of other roads to the site. The area will revegetated using a variety of dryland species at a ratio of 1 over storey species and 4 under or middle storey species per 10 m 2. Suitable species are listed in Table 1 of Appendix 2. Encouraging regeneration of species within the on site seed bank through installation of fencing to limit access by kangaroos along with uncontrolled vehicle or human access. Natural Area Consulting Page 21

29 Undertaking pest control for rabbits using Pindone within (inside) known burrows to prevent other grazing animals, particularly kangaroos, being impacted by the use of the material. Spot weed control on an as required basis, particularly for any declared plants that may occur within the landscape protection area beyond the wetland boundary. Planting in this location is expected to occur during winter 2011, assuming there are no delays with the subdivision process, as winter planting provides conditions most suited to the establishment of seedlings. If seedlings are showing significant signs of stress, watering will occur during the first summer Landscape Protection Area, within Conservation Category Wetland Boundary The landscape protection area contains the conservation category dampland (UFI 13178), thus flora species will typically include both wetland and dryland varieties, with suitable species listed in Table 2 of Appendix 2. Given that the area is not subject to permanent or seasonal inundation, and that depth to groundwater is recognised as increasing with declining rainfall associated with climate change impacts, the species used for revegetation will need to take into consideration likely survival for the current conditions. Accordingly, wetland species that prefer permanently or seasonally inundated conditions on a regular basis are less likely to survive than those that can tolerate damp but not wet conditions. The known groundwater contours at the site can be used to assist with determining the choice of species for the conditions. Revegetation and rehabilitation activities will include: In fill planting with under and middle storey species suited to the dampland conditions and associated transitional areas to achieve an overall density of one plant per square metre. Replanting with tree species suited to conditions within the wetland boundary within transitional areas at a density of one per 10 m 2 to assist with the reestablishment of over storey species. Ensuring replanting activities include the Agonis flexuosa to assist with habitat restoration for the Western Ringtail Possum. Ensuring replanting activities include species suited to provide additional habitat for the Carnaby s and Baudin s Cockatoos, particularly Banksia attenuata, Banksia grandis, Banksia littoralis, Corymbia calophylla, Eucalyptus marginata, and Hakea varia. Encouraging regeneration of species within the on site seed bank through installation of fencing to limit access by kangaroos along with uncontrolled vehicle or human access. Undertaking pest control for rabbits using Pindone within (inside) known burrows to prevent other grazing animals, particularly kangaroos, being impacted by the use of the material. Spot weed control on an as required basis, particularly for any declared plants that may occur within the wetland boundary. Planting in this location is expected to occur during winter 2011, assuming there are no delays with the subdivision process, as winter planting provides conditions most suited to Natural Area Consulting Page 22

30 the establishment of seedlings. If seedlings are showing significant signs of stress, watering will occur during the first summer Public Open Space, within Resource Enhancement Wetland The resource enhancement wetland (UFI 13196) across the middle of Lot 125 will serve a dual purpose as public open space and stormwater drainage during larger rainfall and storm events. Currently, flora species include some melaleuca s and other mature tree species, but like the majority of other areas on the site, it contains little or no middle and understorey species. It also contains no species that like regular or permanently wet conditions, such as rushes and sedges. Some of the melaleuca s towards the east of the POS area are considered to be in good condition (Brand, 2008), but other portions are in a poor or degraded condition. It is expected some of the vegetation will have to be cleared to allow works associated with the formalisation of the drainage requirements. Once the drainage area has been formalised, rehabilitation activities will occur to restore as much vegetation as possible whilst retaining sufficient areas clear to allow unimpeded drainage to occur on the site. Rehabilitation is expected to occur during the winter of Revegetation and rehabilitation activities will include: In fill planting with under and middle storey species suited to the conditions at a density of one per square metre. Ensuring replanting activities include the Agonis flexuosa to assist with habitat restoration for the Western Ringtail Possum and contribute to the enhancement of ecological linkages over the site. Ensuring replanting activities include species suited to provide additional habitat for the Carnaby s and Baudin s Cockatoos, particularly Banksia attenuata, Banksia grandis, Banksia littoralis, Corymbia calophylla, Eucalyptus marginata, and Hakea varia. Encouraging regeneration of species within the on site seed bank through installation of fencing to limit access by kangaroos along with uncontrolled vehicle or human access, at least until such time as the plants become established on the site. Undertaking pest control for rabbits using Pindone within (inside) known burrows to prevent other grazing animals, particularly kangaroos, being impacted by the use of the material. Spot weed control on an as required basis, particularly for any declared plants that may occur within the wetland boundary Revegetation Buffer, north of Lots 176 and 177 The area designated revegetation buffer at the northern boundary of Lots 176 and 177 (refer Appendix 1) is an approx ha cleared area that has been used for cattle grazing for many years. It contains some mature trees that have historically provided shade for the cattle during warmer months. The major aim of revegetation activities in this area is to create a vegetated band that acts as a visual buffer, and to a lesser extent, as a noise barrier, to traffic travelling along the Busselton Bypass. It is recognised that the developers will have the responsibility for implementing the rehabilitation of the revegetation buffer zone, but that individual Lot owners will take over the responsibility for maintaining the buffer upon purchase. Natural Area Consulting Page 23

31 Revegetation activities will commence in winter 2011 and will include: Planting with under and middle storey species suited to the conditions at a density of one per square metre. Appropriate species will primarily be chosen from those listed in Table 1 of Appendix 2, although it is recognised that faster growing species including some non native varieties may be more effective in providing vegetation of a size to be effective as a noise buffer assuming they can tolerate conditions associated with the high watertable level in the area, particularly in winter. Planting a line of taller, over storey species along the fence line, then having such species interspersed at a density of one per 5 or 10 m 2 (depending on species chosen) to both create a stable bushland ecosystem and an effective visual and noise buffer. Ensuring replanting activities include species suited to provide additional habitat for the Carnaby s and Baudin s Cockatoos, particularly Banksia attenuata, Banksia grandis, Banksia littoralis, Corymbia calophylla, Eucalyptus marginata, and Hakea varia. Ensure replanting activities include both potential food sources and trees that could develop nesting hollows over time in order to create and enhance habitat suitable for both the Carnaby s and Baudin s cockatoos. The installation of fencing along the southern portion of the visual and noise buffer to limit access by kangaroos, at least until such time as the seedlings become established on the site. This will also act to encouraging regeneration of species within the on site seed bank. Undertaking pest control for rabbits or other pest species that could act to reduce the success and effectiveness of revegetation activities on an as required basis. Spot weed control on an as required basis Revegetation Methodology The following will be adopted as the broad revegetation methodology to be implemented at the site: Revegetation will be via tubestock at the nominated densities depending on whether plant species are under, middle (1 per square metre) or over storey (1 per 10 m 2 ), Plants species to be used are those listed in Appendix 2, with the aim of recreating vegetation communities that existed prior to clearing, Tubestock will be planted with either a soil conditioning tablet such as Terracottem, or other fertiliser formulation suited to Australian native plants, Planting will occur during winter months only, after the first major rainfall event, Further infill planting will occur if survival of tubestock 12 months after planting is less than 75%, and Broadcasting of a mix of appropriate native seed can be used to assist with revegetation efforts their germination and growth will contribute to vegetation of mixed age rather than primarily a single age Monitoring Methodology Monitoring will occur annually in spring, and will involve the setting up of either quadrats or transects in each location: Natural Area Consulting Page 24

32 Delineating three 10 x 10 metre quadrats in the revegetation buffer at the northern portion of the site, A single east west transect across the POS area in the middle of the site, and Three north south transects incorporating flora within the wetland boundary and the landscape protection area. Within each of the nominated areas, the following will be assessed and recorded on the revegetation monitoring recording form (refer Appendix 3): Species numbers, Percentage cover, Presence of weeds Indication of health, Species density, and Species diversity Projected Timetable It is expected that revegetation activities will commence in autumn of 2011, with weed control activities occurring at the nominated sites, then planting of tubestock and the addition of soil conditioner or native plant fertiliser occurring during winter. Monitoring will occur in spring the following year with outcomes reported to the DEC and the Shire by the end of February the following year. The projected timetable is shown graphically in Table 1. Table 1: Projected Revegetation Timetable Lots 124, 125, 176 and 177 Rendezvous Road Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year 1 (2011) Installation of fencing around areas to be rehabilitated Weed control application 1 Weed control application 2 Planting of tubestock Spreading of seed Watering (if required) Year 2 (2012) Watering (if required) Revegetation monitoring 1 Undertake follow up weed control (if required) Undertake infill planting (if required) Report outcomes to DEC and Shire Year 3 (2013) Revegetation monitoring 2 Undertake follow up weed control (if required) Natural Area Consulting Page 25

33 Undertake infill planting (if required) Watering new tubestock (if required) Report outcomes to DEC and Shire Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Completion criteria Completion criteria for rehabilitation will be as follows: Percentage of native cover between 50 70%, Weed cover 10%,, and Improved species diversity in wetland and dryland areas by 10% or more, given the amount of vegetation that is currently present at the site Weed Control Weeds are present with the subdivision site overall, including the areas where revegetation activities will occur. As weeds compete with native plants for water and nutrients, their removal prior to revegetation activities occurring will improve the likelihood of survival of native species installed. Appropriate weed control activities using selective herbicides for grasses and broad leafed weeds should be undertaken prior to the planting of native species on at least 2 occasions six weeks apart. Planting should occur at least three weeks after the second herbicide application. Monitoring of revegetation success will include observations regarding the presence of weeds. Spot weed control will occur if monitoring activities indicate it would be appropriate to do so (i.e.: weed coverage > 10%). 6.5 Fauna Carnaby s and Baudin s Cockatoos Usage of the site by the Carnaby s Cockatoo, Baudin s Cockatoo is currently limited (refer Harewood, 2007, 2008a, 2008b; Ecosystem Solutions, 2009). As revegetation and rehabilitation activities progress, usage by cockatoos may increase as food and habitat trees mature and reach sufficient size (> 500 mm diameter) over time when nesting hollows can occur. The Carnaby s and Baudin s Cockatoo do not nest at the site (Harewood, 2007, 2008a, 2008b; Ecosystem Solutions, 2009), with only two species (Eucalyptus marginata (Jarrah) and Eucalyptus gomphocephala (Tuart) known to be used by the cockatoo for nesting. However, hollows of sufficient size to provide a nesting site for cockatoos generally do not occur in trees less than 70 years of age, and an approximate trunk diameter size of 500 mm or more (Whitford, 2001). The majority of trees on Lot 124 and the vegetated (southern) portion of Lot 125 have been allowed to regrow since Mr Germain purchased the land just over 20 years ago (Germain, 2008, personal communication), thus they are not of a sufficient size or age to form hollows suitable for cockatoo nesting. Of the trees on the northern portion of Lot 125, and Lots 176 and 177, few are of sufficient age and diameter to potentially contain hollows of sufficient size for cockatoo nesting. Natural Area Consulting Page 26

34 Walker (2007) identified a number of trees in this area that were deemed to be significant for various reasons, including the potential for the formation of nesting hollows. While it won t be possible to retain all significant trees identified by Walker because they coincide with the location of roads and property boundaries (fence lines), the majority occur in areas set aside for revegetation buffer and building setback. Of the 45 flora species known to provide a food source for the cockatoos, only 6 occur on site (Harewood, 2008a; Walker, 2007a; Ekologica, 2008). Accordingly, management will revolve around: Ensuring revegetation activities on site include flora species suitable as food sources, such as: o Banksia attenuata, o Banksia grandis, o Banksia littoralis, o Corymbia calophylla, o Eucalyptus marginata, and o Hakea varia; Where possible, retaining more mature trees with the potential to provide nesting hollows in the future, noting that trees need to be approximately 70 years old before they have the potential to develop nesting hollows, thus the majority of trees on site are too young to have done so; and Ensuring building envelopes occur in degraded or cleared areas in order to minimise the amount of further disturbance on the site Western Ringtail Possum According to Harewood (2007), the Western Ringtail Possum usage at the site was limited to transient activity and movement within the road reserve. Harewood indicated that the possum needs sufficient canopy connectivity, ground cover, and the presence of the Agonis flexuosa (Peppermint) in order to thrive in a particular area. Management aimed at encouraging Western Ringtail Possum populations within the site is based on recommendations made by Harewood (2007), and will include: include Agonis flexuosa (Peppermint) in rehabilitation and revegetation activities at a density of one per 10 metres to restore a continuous canopy between individual trees over time; retain larger lot sizes in vegetated areas with smaller lot sizes in degraded areas (refer DGP, Appendix 1); design of the subdivision such that continuous patches of trees are retained, and that ecological linkages can be improved, particularly in the southern portion of the site; defined building envelopes on what will become Lots 1, 3 10 when the subdivision proceeds (refer DGP, Appendix 1); and development of a fire management plan that considers the subdivision as a whole, rather than on an individual lot basis (refer South West Fire Services, 2009) Western Grey Kangaroo A management plan has been developed that describes how kangaroo numbers will be controlled (Natural Area Consulting, 2011). The fencing of the Landscape Protection Area and individual lots as they are sold and developed will also act to control the locations that Natural Area Consulting Page 27

35 can be readily accessed by the kangaroo, and thus the potential damage they can do to the natural features of the site Other Rabbits are known on the site and are considered to be a pest species, and will be removed through an eradication program using Pindone. Safety measures to prevent kangaroos being affected by the Pindone will include setting up the baits inside burrows, rather than in areas that can be accessed by non target species. 6.6 Ecological Linkages As the areas that will contribute to ecological linkages generally coincide with areas such as the landscape protection area, public open space and the existing road reserve, it is expected that ongoing management will occur as a result of activities associated with these areas. Note that the Shire of Busselton has the primary responsibility for management of the road reserve along Rendezvous Road rather than the developer. However, they commit to not undertaking activities within or around the road reserve beyond those already discussed and known about, such that negative impacts result. 6.7 Disease At present, disease is not an issue at the site. Observations will continue during regular visits by the developers and others, and if signs of disease become apparent, appropriate management strategies will be developed and implemented. 6.8 Fire A fire management plan has been prepared by South West Fire Services (2009) that complies with Shire, WAPC and Fire and Emergency Services Authority (FESA) requirement that outlines: Statutory conditions Vegetation types and classification Bush fire hazard assessment information Firebreaks Building envelopes Fuel reduction Hazard separation zones Roadways and emergency access Lot owners responsibilities This plan indicates that the fire risk is considered to be low. The CCW will be fenced off from the other lots, but will not have a separate fire break around it. This will limit habitat fragmentation and areas where weeds can become established. 6.9 Cultural Heritage While the site is not known for either European or Indigenous heritage, the possibility remains that artefacts or similar may be found during the construction and/or installation of service infrastructure, roads and similar. If so, work will cease immediately and the Natural Area Consulting Page 28

36 developer notified of all relevant details of the find. The developer or their nominated consultant will contact the Department of Indigenous Affairs (DIA) to determine what actions and investigations will be required before work can recommence Community Use and Appreciation Community use of the wetland areas are likely to increase as the subdivision proceeds. The CCW has been designated as a landscape protection area and the resource enhancement category wetland has been set aside for drainage and as public open space. Use of these areas for passive recreation (e.g.: walking, bird watching, photography) will be balanced with designated management aims and objectives. The developer will be responsible for ongoing management of these areas until such time as they are vested with relevant authorities during the subdivision process. Natural Area Consulting Page 29

37 7.0 Implementation and Review 7.1 Plan Responsibilities The developers are responsible for implementing this and other management plans associated with the site. Depending on the nature of the work involved, they may delegate some or all activities described within this plan to their nominated consultants or subcontractors. Any delegated works will need to be carried in accordance with this plan. 7.2 Community and Landowner Consultation The development process includes the requirement for community and stakeholder consultation to occur for a minimum of 28 days, and concerns addressed by the developer prior to plans being submitted to the WAPC for endorsement. Information provided to the community included the developers need to prepare a number of management plans, including this Wetland Management Plan. The rural location of the site and the surrounding properties mean that the potential for wider community interest in this plan is limited. This plan has been developed with the knowledge and approval of the current landowner, Mr Germain, and the developers. Consultation has also occurred with relevant government agencies including the Department of Environment and Conservation, the Shire of Busselton, the Department of Water, and the Department of Environment, Water, Heritage and the Arts. 7.3 Management Plan Implementation Risk Assessment The subdivision design process has considered the natural environmental values at the site and provided for their enhancement and ongoing protection. Accordingly, it is considered that there are few risks associated with implementing the provisions of this management plan. Details of the risk assessment process and outcomes are provided in Appendix Reporting and Auditing (Monitoring) of Management Plan Performance In order to ensure the continued effectiveness of this management plan, the success or otherwise of the required strategies described will be formally monitored on a semi annual basis, generally during spring and autumn. Monitoring will include a visual inspection of the site, including the setting up of photo monitoring points for areas where revegetation activities have occurred, checking for the presence of weeds and other pests, and checking and maintaining fences. Outcomes of monitoring activities will be reported annually to the DEC and the Shire of Busselton for a period of three years. Rehabilitation and revegetation activities will commence within the landscape protection area and the buffer zone within the northern portions of Lot 176 and 177 during winter of 2011, with reporting commencing during Revegetation activities will commence in the Public Open Space area once drainage works are concluded. At present, it is unknown when these are expected to occur. 7.5 Plan Review and Term The preparation of this management plan has including seeking input from relevant stakeholders. Accordingly, it is expected to remain current for the duration of the time the developers retain responsibility for the site. This is expected to be for a period of three years at most. Natural Area Consulting Page 30

38 7.6 Funding The developers, Vasse Property Pty Ltd, are responsible for funding all activities detailed in this management plan for a period of three years. 7.7 Handover Arrangements At the conclusion of the 3 year revegetation maintenance period, the areas designated landscape protection ; public open space and revegetation buffer will transfer from being the responsibility of the developers to other individuals or organisations as appropriate. Responsibility for the landscape protection area and the public open space are expected to be identified during the subdivision process by the WAPC, and the sale of individual Lots will occur over time according to staging of required works and availability for sale Landscape Protection Area containing Conservation Category Wetland It is expected that the Landscape Protection Area will be ceded to the Crown for the purposes of conservation, as per Section 152 of the Planning and Development Act, 2005 (WA), for vesting with an appropriate body for ongoing management, as decided by the WAPC Area Designated Public Open Space It is expected that the area designated as public open space crossing Lot 125 will eventually be vested with the Shire of Busselton Revegetation Buffer Northern Portion of Lots 176 and 177 The area designated revegetation buffer sits at the top of Lots 176 and 177 and will ultimately be sold as Lots within the subdivision are sold. Responsibility for maintaining the buffer area will transfer from the developers to the new owner after a period of three years. Lot Titles will include information about the need to maintain the buffer. Natural Area Consulting Page 31

39 References Blankendaal, P., (2011), Disease Hygiene Coordinator, DEC Bunbury, Personal Communication. Brand, S., (2008), Vegetation Condition Survey Report Lot 123 Rendezvous Road, Vasse, unpublished report prepared for Vasse Property Pty Ltd. Bureau of Meteorology, Historical Weather Data, available World Wide Web URL: accessed May 2010 (Station ID Busselton). Department of Environment and Conservation, (2008), Guidelines Checklist for Preparing a Wetland Management Plan for Development, Subdivision or Scheme Amendment Approvals, or Local Government Development Applications, available World Wide Web URL: accessed 05 May Department of Environment and Conservation Wetlands Branch, (2010), personal communication, 25 May Department of Environment and Conservation (2010), Wetlands within the Boundaries of Lots 124, 125, 176 and 177 Rendezvous Road, available World Wide Web URL: accessed May Department of Environment, Heritage, Water and the Arts, (2009a), Significant Impact Guidelines for the Vulnerable Western Ringtail Possum (Pseudocheirus occidentalis) in the Southern Swan Coastal Plain, Western Australia, Nationally Threatened Species and Ecological Communities EPBC Act Policy Statement 3.10, available World Wide Web URL: ringtail possum.html, accessed May Department of Environment, Heritage, Water and the Arts, (2009b), Background Paper to EPBC Policy Statement 3.10 Nationally Threatened Species and Ecological Communities Significant Impact Guidelines for the Vulnerable Western Ringtail Possum (Pseudocheirus occidentalis) in the Southern Swan Coastal Plain, Western Australia, available World Wide Web URL: ringtail possum.html, accessed May Department of Indigenous Affairs, (2010), Aboriginal Heritage Inquiry System, available World Wide Web URL: accessed June Department of Water, (2010), Local Water Management Strategy Approval Letter. Dieback Working Group, (2000), Managing Phytophthora Dieback Guidelines for Local Government, Available World Wide Web URL: accessed 11 February Natural Area Consulting Page 32

40 Ecosystem Solutions Pty Ltd, (2009), Survey for the Abundance and Distribution of Western Ringtail Possums (Pseudocheirus occidentalis) and Other Significant Fauna, unpublished report prepared for Vasse Property Pty Ltd. Ekologica Pty Ltd, (2008), Report on flora survey of Lots 123, 1444, 176 and 177 Rendezvous Road Busselton, unpublished report prepared for Vasse Property Pty Ltd. Environmental Protection and Biodiversity Conservation Act 1999 (Cwlth) Germain, T., (2008), owner then Lot 123 Rendezvous Road, Vasse, Personal Communication. Harewood, G., (2007), Western Ringtail Possum Assessment Survey Lots 123, 1444, 176 and 177 Rendezvous Road, Vasse, unpublished report prepared for Vasse Property Pty Ltd. Harewood, G., (2008a), Black Cockatoo Assessment Survey Lots 123, 1444, 176 and 177 Rendezvous Road, Vasse, unpublished report prepared for Vasse Property Pty Ltd. Harewood, G., (2008b), Further Information on Carnaby s and Baudin s Black Cockatoo and the Western Ringtail Possum in Relation to Lots 123, 1444, 176 and 177 Rendezvous Road Vasse, unpublished report prepared for Vasse Property Pty Ltd. Koroveshi, L., Strategic Land Use Planner, Shire of Busselton, Personal Communication. Lane, L., (2010), Personal Communication June Mitchell, D., Williams, K., Desmond, A., (2002), Swan Coastal Plain 2 (SWA2 Swan Coastal Plain Subregion), available World Wide Web URL: accessed May Molloy, S., Wood, J., Hall, S., Wallrodt, S., Whisson, G., (2009), South West Ecological Linkages Technical Report, Western Australian Local Government Association and Department of Environment and Conservation, Perth, Western Australia. Morgan, C., (2010), Senior Environmental Scientist, Western Power, (Personal Communication December 2010). Natural Area Consulting, (2011), Kangaroo Management Plan Lots 124, 125, 176 and 177 Rendezvous Road, Vasse, unpublished report prepared for Vasse Property Pty Ltd. Natural Area Consulting and Wood and Grieve Engineers, (2010), Urban Water Management Plan Lots 124, 125, 176 and 177 Rendezvous Road, Vasse, unpublished report prepared for Vasse Property Pty Ltd. Oldfield, W., (2010), Coordinator, Environmental Planning, Shire of Busselton (Personal Communication, December 2010). Natural Area Consulting Page 33

41 Planning and Development Act, 2005 (WA) Shared Land Information Platform (SLIPs), Natural Resource Management, available World Wide Web URL: accessed May Slade, A., (2010), West Australia South Australia Section Approvals and Wildlife Division, Department of the Environment, Water, Heritage and the Arts, personal communication, May SMEC Urban, (2010), Local Water Management Strategy Lots 124, 125, 176 and 177 Rendezvous Road, Vasse, unpublished report prepared for Vasse Property Pty Ltd. South West Fire Services, (2009), Fire Management Plan for Lots 123, 1444, 176 and 177 Rendezvous Road, Vasse, unpublished report prepared for Vasse Property Pty Ltd. Walker, C., (2007a), Environmental Site Assessment Lots 1444, 176, 177 Rendezvous Road, Busselton, unpublished report prepared for Vasse Property Pty Ltd. Walker, C., (2007b), Flora Survey and Environmental Assessment Lot 123 Rendezvous Road, Busselton, unpublished report prepared for Vasse Property Pty Ltd. Walker, C., (2009), Preliminary Acid Sulphate Soils Risk Assessment, Rendezvous Road, Busselton, unpublished report prepared for Vasse Property Pty Ltd. Webb, A, (2010), Officer, Department of Environment and Conservation, personal communication, June Whitford, K., (2001), Hollows in jarrah (Eucalyptus marginata) and marri (Corymbia calophylla) trees I. Hollow sizes, tree attributes and ages, in Forest Ecology and Management 5514 (2001) Wildlife Conservation Act 1950 (WA) Woodward, J., (2010), Department of Water, Personal Communication. Natural Area Consulting Page 34

42 Glossary and Acronyms CCW Dampland DEC DGP DIA DoW Term Definition Conservation category wetland wetland recognised by the Department of Environment and Conservation as having values and attributes worthy of protection through the reservation or the application of policies Seasonally waterlogged (damp) basin Department of Environment and Conservation Development Guide Plan Department of Indigenous Affairs Department of Water EPBC Environmental Protection and Biodiversity Conservation Act 1999 (Cwlth) FESA Floodplain NAC Sumpland SWA2 TP UFI WAPC Fire and Emergency Services Authority of Western Australia Area of land used during flooding events, such as the overflow of rivers or streams or storm surge in coastal areas Natural Area Consulting Seasonally inundated basin Swan Coastal Plain 2 subregion of the Interim Biogeographic Regionalisation of Australia Test pit identification number assigned by Douglas Partners during their geotechnical survey in 2007 Unique Feature Identifier identification number assigned to wetlands by the DEC Western Australian Planning Commission Natural Area Consulting Page 35

43 Appendix 1: Approved Subdivision Lot Layout Natural Area Consulting Page 36

44 Agreed buffer for Caladenia procera, agreed with DEC June 2010 Natural Area Consulting Page 37