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Glyn Rhonwy Pump Storage - Phase 1 Habitat Report

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Glyn Rhonwy Pump Storage - Phase 1 Habitat Report Glyn Rhonwy Pumped Storage Development Consent Order Appendix 7.1 AECOM (2013a) Glyn Rhonwy Pump Storage - Phase 1 Habitat Report Table of Contents 1 Executive Summary .......................................................................................................................................................... 1 2 Introduction ....................................................................................................................................................................... 2 2.1 Introduction ............................................................................................................................................................ 2 2.2 Development Proposals ......................................................................................................................................... 2 2.3 Site Description...................................................................................................................................................... 2 2.4 Objectives .............................................................................................................................................................. 3 2.5 Legislation ............................................................................................................................................................. 3 2.6 Quality Assurance.................................................................................................................................................. 3 3 Methodology ...................................................................................................................................................................... 4 3.1 Desk Study ............................................................................................................................................................ 4 3.2 Extended Phase 1 Habitat Survey ......................................................................................................................... 5 3.3 Assessment of Bat Potential .................................................................................................................................. 5 3.4 Limitations to Phase 1 Survey and Desk Study ..................................................................................................... 6 4 Baseline Conditions .......................................................................................................................................................... 7 4.1 Desk Study ............................................................................................................................................................ 7 4.2 Extended Phase 1 Survey ................................................................................................................................... 11 4.3 Protected or Notable Species .............................................................................................................................. 17 5 References ....................................................................................................................................................................... 20 Figure 1: Phase 1 Habitat Map ..................................................................................................................................................... 21 Appendix A: Target Notes for Figure 1 ....................................................................................................................................... 22 Appendix B: Legislation ............................................................................................................................................................... 23 Appendix C: Biodiversity Action Plan Species and Habitats ................................................................................................... 26 Appendix D: Project Staff ........................................................................................................................................................... 28 Appendix E: Site Photographs .................................................................................................................................................... 29 Appendix F: Bird Species Records from Cofnod Local Record Centre ................................................................................... 39 Appendix G: Tree Preservation Order Plan ................................................................................................................................ 40 AECOM Glyn Rhonwy Pump Storage – Phase 1 Habitat Report 1 Capabili ies on project: Environment 1 Executive Summary AECOM were commissioned by Snowdonia Pumped Hydro (SPH) to undertake an Extended Phase 1 Habitat Survey for a proposed pumped storage scheme (hereby referred to as the Development) and associated electrical connection. This report provides an overall ecological description of the site and identifies potential ecological constraints. The report includes a desk study and an Extended Phase 1 Habitat Survey. An extension to the previous site boundary was made in 2014, and as such AECOM were commissioned to survey the full Order Limits and conduct a site walkover to confirm the status of the previously assessed areas. A previous Phase 1 Habitat Survey and further Phase 2 surveys were carried out by Cambrian Ecological Partnership in 2011. This report is an update of their findings and current conditions on the site. Ecological impacts and recommendations for mitigation will be addressed in the Ecological Assessment required for the development and will not be addressed in this report. The Development is located in a disused slate quarry 1km north west of Llanberis, Gwynedd, National Grid Reference (NGR) SH 564 608. The Development includes the flooding of quarry 1 (Q1) and quarry 6 (Q6). This will include the construction of an underground pipe (penstock) connecting the two quarries and extending north east to an outflow at Llyn Padarn. An electrical connection will run from the power house located on Platform 5 of the Glyn Rhonwy Industrial Estate platforms and follows the A4086, A4244 and B4547 roads to an electricity sub-station 7km north. For the purpose of this report, the Development has been split into two distinct areas: - The Development: includes the quarries, pipe and construction compounds. - The electrical connection: Include a buffer of 25 metres either side of the electrical connection extending from the main site to the electricity sub-station. This electrical connection is subject to a separate consenting regime and therefore is not classed as Associated Development in Wales under the Planning Act 2008. This survey has been undertaken to inform whether there are likely to be any significant cumulative effects. The Development comprises seven disused quarries with associated slate spoil heaps and slate plateaus. Further habitats within the development include mosaics of acid grassland with heath, broadleaved and mixed semi-natural woodland, scrub, improved grassland, acid grassland, semi-improved grassland, marshy grassland and coniferous plantation woodland. The site boundary extends into Llyn Padarn. The Development has potential to support lichens, bryophytes, invertebrates, fish, common amphibians, reptiles, birds, bats and badgers. The electrical connection runs adjacent to the A4086, A4244 and B4547 roads for its entire length. Semi-improved grassland verges, hedgerows, marshy grassland, improved grassland and scrub run parallel to the road and electrical connection. The route crosses two rivers the Afon Cegin and Afon Rhythallt. It crosses 17 other mapped streams or ditches which were not visible during the survey and may be culverted under the road. The electrical connection has potential to support, invertebrates, fish, common amphibians, reptiles, birds, bats, badgers, otters and water vole. Invasive plant Himalayan balsam was present within the electrical connection boundary and there is potential for invasive species to be present within the in the south eastern more disturbed and publically accessible areas of the Development, though none was directly observed. There has been no significant change in the habitats present on site since the original Phase 1 Habitat Survey by Cambrian Ecological Partnership in 2011. The Executive Summary is intended to provide a synopsis of the report only. AECOM Glyn Rhonwy Pump Storage – Phase 1 Habitat Report 2 Capabili ies on project: Environment 2 Introduction 2.1 Introduction AECOM were commissioned by Snowdonia Pumped Hydro (SPH) to undertake an Extended Phase 1 Habitat Survey for a proposed pumped storage scheme (hereby referred to as the Development) and associated electrical connection. This report provides an overall ecological description of the site and identifies potential ecological constraints. The report includes a desk study and an Extended Phase 1 Habitat Survey. A previous Phase 1 Habitat Survey and further Phase 2 surveys were carried out by Cambrian Ecological Partnership in 2011. This report is an update of their findings and current conditions on the site. Ecological impacts and recommendations for mitigation will be addressed in the Ecological Assessment required for the development and will not be addressed in this report. The Development is located in a disused slate quarry 1km north west of Llanberis, Gwynedd, National Grid Reference (NGR) SH 564 608. 2.2 Development Proposals
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