Landscape and Visual Assessment March 2021

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Landscape and Visual Assessment March 2021 STITHIANS WATER TREATMENT WORKS CORNWALL LANDSCAPE AND VISUAL ASSESSMENT MARCH 2021 TEP The Reynard Suite, Bowden Business Village, Market Harborough, Leicestershire, LE16 7SA Tel: 01858 383120 E-mail: [email protected] www.tep.uk.com Offices in Warrington, Market Harborough, Gateshead, London and Cornwall PLANNING I DESIGN I ENVIRONMENT Stithians Water Treatment Works Cornwall Landscape and Visual Assessment Document Title Landscape and Visual Assessment Prepared for nmcn on behalf of South West Water Prepared by TEP - Market Harborough Document Ref 8651.001 Author Louise Fitzgerald Date March 2021 Checked Ian Grimshaw Approved Ian Grimshaw Amendment History Check / Modified Version Date Approved Reason(s) issue Status by by 1.0 11.03.21 LF IJG Draft for client comment Draft 2.0 16.03.21 LF IJG Final Issue Final Minor amendments to development 3.0 17.03.21 LF IJG Final description Minor amendments to UV building 4.0 23.03.21 LF IJG Final description Stithians Water Treatment Works Cornwall Landscape and Visual Assessment CONTENTS PAGE Executive Summary ................................................................................................................ 1 1.0 Introduction ............................................................................................................... 3 2.0 Method, Scope and Context ...................................................................................... 4 3.0 Legislation and Policy Context .................................................................................. 6 4.0 Landscape Baseline ................................................................................................ 11 5.0 Visual Baseline ....................................................................................................... 19 6.0 The Proposed Development ................................................................................... 33 7.0 Assessment of Landscape Effects .......................................................................... 35 8.0 Assessment of Visual Effects .................................................................................. 39 9.0 Summary ................................................................................................................. 51 References ............................................................................................................................ 53 Glossary ................................................................................................................................ 54 FIGURES Figure 1: Site Location Plan Figure 2: Landscape and Environmental Designations Figure 3: Landscape Character Areas Figure 4: Topography Figure 5: Visual Receptor Plan Figure 6: Representative Viewpoints APPENDICES APPENDIX A: Site Plan APPENDIX B: Landscape Masterplan APPENDIX C: Landscape and Visual Methodology 8651.001 March 2021 Version 4.0 Stithians Water Treatment Works Cornwall Landscape and Visual Assessment Executive Summary 1. This Landscape and Visual Assessment (LVA) considers the impact of the Proposed Development at Stithians Water Treatment Works on the local landscape. The landscape and visual assessment has assessed the existing landscape character and visual amenity of the area and its sensitivity to change. 2. The Proposed Development comprises: • Provision of a Granular Activated Carbon Contactors and Primary Filters Building measuring 23.26m x 17.98m x 7.52m x 8.26m high to eaves, • Provision of an Ultra Violet Disinfection Plant Building measuring 16.225 x 7.125m x 3m high to eaves, • Provision of a Motor Control Centre Building measuring 7.5m x 4.5m x 3.3m high to eaves, 3. At the county level, the Site lies within Landscape Character Area 10 - Carnmenellis. This is an elevated undulating granite plateau with outcrops in places, incised by stream valleys. The area is open and exposed with few trees on the tops although there are some limited broadleaved plantations in the valley heads and bottoms. The field pattern varies from small fields, bounded by sinuous Cornish hedges or hedgerows, to more recent enclosure of former rough ground into strongly rectilinear field patterns. Land use is predominantly pastoral with some rough grazing. Mining (tin and copper) and quarrying have been of major importance in the area in the past and evidence of this intense industrial use is visible in the form of engine houses and tips. 4. The Site lies within the Carn Brea, Carnmenellis and Carn Marth Area of Great Landscape Value (AGLV). AGLVs are areas of high landscape quality with strong and distinctive characteristics which make them particularly sensitive to development. Within AGLVs the primary objective is conservation and enhancement of their landscape quality and individual character. 5. The study has assessed the potential effects on landscape character and concluded that these would be minor adverse to negligible in the short and long-term. The landscape character of the site would change as a result of the proposed development but would be consistent with its surroundings and would not impinge materially on landscape character beyond the Site. 6. There are private views towards the Site from residential properties at Dam Bungalows to the north of the Site, with public views possible from the local Public Rights of Way network, particularly from PRoW Bridleway 231/52/1 to the immediate north of the Site. There are long distance views towards the Site from Carnmenellis Hill and the circular route around Stithians Reservoir within the Cornwall and West Devon Mining Landscape World Heritage Site, however the Site is barely discernible at such distance. 7. During construction and operation, the Proposed Development will have a restricted landscape and visual effect, with the most significant effects occurring close to the Site from the circular route along Stithians Dam, PRoW Bridleway 231/52/1, PRoW 8651.001 Page 1 March 2021 Version 4.0 Stithians Water Treatment Works Cornwall Landscape and Visual Assessment Footpath 231/53/1, PRoW Footpath 231/9/1 and PRoW Footpath 231/17/6. During construction the overall effect on these receptors will be localised moderate or major adverse. Such effects will be mitigated by the design of the Proposed Development in conjunction with planting, although it will take time for new planting to become established. Long-term adverse effects will be restricted to those receptors close to the Site, and those in elevated positions where the residual effect in most instances will be moderate adverse. In the far extents of the study area the Proposed Development will be barely discernible beyond the existing dam structure and the effect will be negligible. 8. The Landscape Masterplan proposes a new native hedgerow, native shrubs and trees to the south of PRoW Bridleway 231/52/1 which will provide some softening in views from the Bridleway, and from PRoW Bridleway 231/53/1. Given the relative elevation of most visual receptors above the Site, the effects of the Proposed Development cannot be fully mitigated. 9. The physical change to the landscape at the Site resulting from the proposed development would have a negligible effect on the character of the wider landscape where the existing water treatment works is clearly visible. 8651.001 Page 2 March 2021 Version 4.0 Stithians Water Treatment Works Cornwall Landscape and Visual Assessment 1.0 Introduction 1.1 This report provides a landscape and visual assessment (LVA) of proposed Granular Activated Carbon (GAC) contactors and primary filters within a new building, an Ultra Violet (UV) disinfection plant and Motor Control Centre (MCC) (comprising the 'Proposed Development') on land at Stithians Water Treatment Works (the 'Site'). The provision of new clean backwash tanks, regen tanks, Clean Backwash Pumping Station, Interstage Pumping Station, Tarmac access roads, retaining walls, fencing, interconnecting pipework, associated plant and equipment are all considered to be Permitted Development, and this assessment focusses primarily on the proposed GAC, UV and MCC buildings. The Site boundary and location are shown on Figure 1. 1.2 This LVA assesses the potential effects of the proposed development on landscape character and landscape features and effects on visual amenity. The assessment is based on the proposals illustrated on the 'Site Plan' prepared by Arcadis (see Appendix A), accompanying elevations and the Landscape Masterplan (see Appendix B) and Detailed Planting Plans prepared by The Environment Partnership (TEP) Limited. 1.3 This report includes a review of published landscape documentation relevant to the Site; a description of the baseline conditions on the Site and the surrounding area; a description of existing visual amenity and views towards the Site; a description of the proposed development including embedded mitigation measures; and an assessment of the effects on both the landscape and visual amenity. 1.4 This report includes the following sections: • Section 2.0 - Method, Scope and Context; • Section 3.0 - Legislation and Policy Context; • Section 4.0 - Landscape Baseline; • Section 5.0 - Visual Baseline; • Section 6.0 - The Proposed Development; • Section 7.0 - Assessment of Landscape Effects; • Section 8.0 - Assessment of Visual Effects; and • Section 9.0 - Summary. 1.5 This LVA is supported by a series of Figures (Figures 1 to 6) provided at the end of this report. Figures show relevant local planning policy, topography, and published landscape character assessment data; identify visual receptors;
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