Coliban Water Castlemaine Link - Sandhurst Reservoir Alignment Options Flora and Fauna Assessment August 2016
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Coliban Water Castlemaine Link - Sandhurst Reservoir Alignment Options Flora and Fauna Assessment August 2016 Executive summary The Castlemaine Link Harcourt Modernisation Project is a three-stage project. This report relates to a portion of Stage 2, the Castlemaine Link Project (the project), which consists of 13 km of pipe and is in the approvals phase. In 2011 Biosis conducted a flora and fauna assessment of the original alignment through the Sandhurst Reservoir area. The original alignment is no longer a viable option as a number of assets have been built over the proposed construction corridor since the original assessments were undertaken in 2011. As such, Coliban Water has developed two alternative pipeline alignment options within the Sandhurst Reservoir area. The purpose of this report is to identify the ecological values and constraints associated with the two alternative alignment options within the Sandhurst Reservoir area, to identify ways to avoid and minimise impacts to native vegetation and fauna habitat, and to determine the legislative implications that may arise for the two alignments, compared to the implications for the original alignment. WTP Alignment Summary Impacts on vegetation in the WTP Alignment would be limited to planted indigenous and non-indigenous vegetation as well as a small patch of native regrowth (0.04 ha) where the WTP Alignment is that of the original alignment (see section 4.1.1 for details). Proposed impacts to vegetation along the WTP Alignment are unlikely to require assessment under the Biodiversity Assessment Guidelines, and will not require additional permits, approvals or vegetation offsets. It is estimated that the WTP Alignment would have approximately the same impact on native vegetation as the original alignment. No flora or fauna species or communities listed under the Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act) or the Flora and Fauna Guarantee Act 1988 (FFG Act) were identified during the field assessment, or are considered likely to occur within the WTP Alignment option. Superpipe Alignment Summary Potential impacts on native vegetation within this alignment would be 0.24 ha (0.15 Habitat hectares) of Box Ironbark Forest (EVC 61), and two remnant scattered trees (see section 4.1.2 for details). Any impacts on native vegetation along the Superpipe Alignment would contribute to the overall area of native vegetation removal that the broader project requires to be documented and offset, when being assessed by the relevant authority. Approximately 69 individuals of the rare Grevillea dryophylla (Goldfields Grevillea) (listed on the Department of Environment, Land, Water and Planning (DELWP) Advisory List of Rare or Threatened Plants in Victoria (VROTS)) were observed within the alignment corridor. GHD | Report for Coliban Water - Castlemaine Link - Sandhurst Reservoir Alignment Options, 31/33964 | i The woodland habitat present along the Superpipe Alignment may provide habitat for a number of threatened fauna species, including the EPBC-listed Swift Parrot (Lathamus discolor). However, given the small amount of disturbance relative to the area of better quality habitat surrounding the proposed alignment, it is considered unlikely that the proposed construction would have a significant impact on the threatened fauna species. No flora or fauna communities listed under the EPBC Act or the FFG Act were identified during the field assessment of the Superpipe Alignment, or are considered likely to occur within the Superpipe Alignment option. Implications for existing project obligations under the Environment Effects Act 1978 As a part of the original approvals process for the broader project, the Castlemaine Link project in 2011, the Castlemaine Link project was referred under the Victorian Environment Effects Act 1978 (EE Act) (Referral number 2011R-05). The project was deemed not to require an Environment Effects Statement (EES), subject to a number of conditions (Appendix A). These conditions are based on the impacts to vegetation and fauna habitat across the broader project area, including the impacts associated with the original alignment through the Sandhurst Reservoir area. One purpose of this report was to address the potential implications of an alignment change for the project’s existing legislative obligations under EE Act. The adverse impacts to native vegetation and fauna habitat would be greater for the Superpipe Alignment option than the WTP Alignment option, and the original alignment. However, compared with the original alignment, the Superpipe Alignment impacts are not considered a material increase to ecological impacts to the project as a whole. Adopting either of the alternative alignment options will not result in the project violating the existing conditions under the EE Act for the project. Therefore, if either of the two alternative alignment options are adopted, an amendment to the existing referral under the EE Act is unlikely to be required. This report is subject to, and must be read in conjunction with, the limitations set out in section 1.4 and the assumptions and qualifications contained throughout the Report. GHD | Report for Coliban Water - Castlemaine Link - Sandhurst Reservoir Alignment Options, 31/33964 | ii Abbreviations CALP Catchment and Land Protection Act 1994 CMA Catchment Management Authority DBH Diameter at Breast Height DELWP Victorian Department of Environment, Land, Water and Planning (formerly DEPI/DSE) DEPI Victorian Department of Primary Industries DNRE Victorian Department of Natural Resources and Environment DotE Commonwealth Department of the Environment DSE Victorian Department of Sustainability and Environment (now DELWP) EE Act Victorian Environment Effects Act 1978 EPBC Act Environment Protection and Biodiversity Conservation Act 1999 EVC Ecological Vegetation Class FFG Act Flora and Fauna Guarantee Act 1988 GHD GHD Pty Ltd HabHa Habitat Hectare HZ Habitat Zone NCCMA North Central Catchment Management Authority PMST Protected Matters Search Tool TPZ Tree Protection Zone VBA Victorian Biodiversity Atlas VROTS Species listed on DELWP’s Advisory List of Rare or Threatened Plants in Victoria WONS Weed of National Significance WTP Veolia Water Treatment Plant GHD | Report for Coliban Water - Castlemaine Link - Sandhurst Reservoir Alignment Options, 31/33964 | iii Table of contents Executive summary ................................................................................................................................... i Abbreviations ........................................................................................................................................... iii 1. Introduction..................................................................................................................................... 1 1.1 Background .......................................................................................................................... 1 1.2 Purpose and scope .............................................................................................................. 1 1.3 Study area ............................................................................................................................ 2 1.4 Limitations ............................................................................................................................ 2 1.5 Assumptions ........................................................................................................................ 3 1.6 Acknowledgements .............................................................................................................. 4 2. Methods.......................................................................................................................................... 6 2.1 Desktop review .................................................................................................................... 6 2.2 Site assessment ................................................................................................................... 6 2.3 Nomenclature and conservation status ............................................................................... 7 3. Desktop assessment ...................................................................................................................... 9 3.1 Previous reports: Original alignment .................................................................................... 9 3.2 Desktop assessment for two alternative alignments ........................................................... 9 4. Site assessment ........................................................................................................................... 12 4.1 Site description .................................................................................................................. 12 4.2 Flora site assessment results ............................................................................................ 13 4.3 Fauna site assessment results .......................................................................................... 17 5. Comparison of the alignment options .......................................................................................... 22 5.1 Summary of impacts for the two alternative alignment options ......................................... 22 5.2 Comparison of impacts between three alignment options ................................................. 22 6. Policy and legislative implications ...............................................................................................