F. Geology & Hydrology ( PDF | 31.0 MB ) - RWE.com

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1 INTRODUCTION This report presents the results of a desk-based study and targeted peat depth survey conducted at the Clocaenog Forest Wind Farm site in Denbighshire and Conwy, North Wales. The study was undertaken to determine the extent of peat deposits in the vicinity of the proposed wind farm infrastructure, both to inform amendments to the site layout during the design stage, and to identify areas where mitigation measures are required to protect peatland habitats during construction and operation of the wind farm. The specific objectives of the peat assessment were to: • review existing information sources to identify potential areas of peat deposits across the site; • undertake a targeted peat survey of the site to ‘ground truth’ the existing sources of information and identify the extent of peat deposits in proximity to wind farm infrastructure; • inform amendments to the wind farm site layout to avoid impacting on peat deposits where possible; • calculate the approximate area and volume of peat that will be directly and indirectly impacted by the proposed scheme; and • identify areas where mitigation measures are required to prevent or reduce impacts to identified peat deposits. The remainder of this report is structured as follows. • Section 2 outlines the assessment methodology and the consultation undertaken to date with Countryside Council for Wales (CCW). • Section 3 presents the results of the desk-based study and field survey, and the calculations of direct and indirect peat loss as a result of wind farm construction. • Section 4 identifies the recommended mitigation measures to prevent and reduce impacts to the identified peat deposits. • Section 5 presents a summary of the results. ENVIRONMENTAL RESOURCES MANAGEMENT RWE NPOWER RENEWABLES LTD 1
2 ASSESSMENT METHODOLOGY 2.1 INTRODUCTION 2.2 DESK STUDY The extent and depth of peat deposits across the development area was assessed through a combination of desk-based study and field survey work, using the methodologies outlined in Sections 2.2 and 2.3 respectively. Following completion of the peat survey and finalisation of the site layout, the approximate area and volume of peat that will be directly and indirectly impacted by the proposed scheme was calculated using the method outlined in Section 2.5. A summary of the consultation undertaken with Countryside Council for Wales (CCW) to agree the proposed survey methodology is presented in Section 2.6. The purpose of the desk study was to identify the potential extent of peat deposits across the development area based on existing information. As well as determining whether the peat resource on site was extensive (ie covering the majority of the development area) or limited to more localised areas, the desk study was used to identify areas where more targeted peat probing was required and to inform initial changes to the site layout (see Chapter 3 of the ES for further information regarding how the peat assessment has informed the final site design). The desk study covered the entire development area, to ensure that as much information was gathered as possible to inform alterations to the site layout. The desk-based study included a review of the following existing information sources: • British Geological Survey (BGS) 1:50,000 solid and drift geology map data to identify potential areas of peat deposits; • Cranfield University’s National Soil Resources Institute 1:250,000 National Soil Map data (1) to identify the distribution and characteristics of soil associations across the development area, in particular to identify any soil associations with an important peat element; • Ordnance Survey 1:25,000 and 1:50,000 map data to identify those areas which may be prone to peat accumulation (eg flatter slopes, valley bottoms, saddles between river catchments, gently sloping spurs); (1) National Soil Resources Institute (2009). Full Soils Site Report for location 301000E 356500N, 5km x 5km, National Soil Resources Institute. Cranfield University, access vua https://www.landis.org.uk/sitereporter/. ENVIRONMENTAL RESOURCES MANAGEMENT RWE NPOWER RENEWABLES LTD 2
Page 1 and 2: Annex F Geology and Hydrology • F
Page 3 and 4: F1 WATER RESOURCES AND FLOODING - L
Page 5 and 6: After the GQA has been conducted, a
Page 7 and 8: Protection Zones (SPZs) across Engl
Page 9 and 10: F1.13 CLWYD STRUCTURE PLAN SECOND A
Page 11: CONTENTS 1 INTRODUCTION 1 2 ASSESSM
Page 15 and 16: • Each peat probing location was
Page 17 and 18: 3 RESULTS 3.1 DESK STUDY RESULTS 3.
Page 19 and 20: lower horizon. From these soil seri
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Page 33 and 34: 3.2.4 Peat Loss Calculations Direct
Page 35 and 36: Infrastructure component Access tra
Page 37 and 38: 4 RECOMMENDED MITIGATION MEASURES 4
Page 39 and 40: Appendix 1 CCW Consultation
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Page 43 and 44: Undertaking'. Within this document
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Page 47 and 48: We recommend the inclusion of detai
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Page 51 and 52: CADEIRYDD/CHAIRMAN: JOHN LLOYD JONE
Page 53 and 54: Peat depth Peat depth is some refec
Page 55 and 56: Annexe 1: 1.1 Overview (limited ext
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Page 59 and 60: It would be useful to define what i
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1 PHOTOLOG OF SURVEY LOCATIONS Figu
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Figure 1.5 Turbine 4 Figure 1.6 Tra
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Figure 1.9 Track past Turbine 7 Fig
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Figure 1.13 Turbine 11 - Dense fore
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Figure 1.17 Turbine 13 Figure 1.18
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Figure 1.21 Turbine 19 Figure 1.22
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Figure 1.25 Track past Turbine 25 F
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Appendix 3 Detailed Results Figures
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KEY: 0.15m 0.08m 0.2m 0.28m 0.18m 0
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KEY: Development Area Turbine Sampl
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KEY: TURBINE 4 Development Area Tur
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KEY: Development Area Turbine Sampl
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KEY: TURBINE 22 Development Area Tu
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KEY: TURBINE 26 Development Area Tu
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KEY: 0.2 0.12 Development Area Turb
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National Soil Resources Institute S
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Annex F4 Flood Consequences Assessm
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Flood Consequences Assessment - Clo
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Contents Executive Summary ........
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1 Introduction 1.1 Objectives Walli
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Runoff rates under 100-year storm t
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2 Description of the Site 2.1 Backg
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Steep channel with forest debris cl
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Figure 3 Location of proposed turbi
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2.4 Catchment Delineation An assess
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Outfall grid reference Total catchm
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Tests were attempted at two sites w
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The long term impacts on the surfac
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4 Flood Consequences Assessment 4.1
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4.3 Current Flood Risk In summary,
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Analyses are not presented for the
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WRAP fractional extents of 0.75 WRA
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5.3 Calculation of Existing Greenfi
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Afon Alwen No. 3 Afon Alwen No. 4 R
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1. Do nothing - on the grounds that
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5.6 Construction Appropriate method
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On the basis of a literature review
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Robinson, M. and Dupeyrat, A. 2005.
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Clocaenog Methodology and reasons f
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Clocaenog Methodology for mineral s
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Clocaenog Methodology for mineral s
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1.1 OVERVIEW CLOCEANOG WIND FARM BO
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Table1.1 Forest and Water Guideline
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Table 1.2 Borrow pit search areas S
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Table 1.3 Recommended borrow pit lo
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Name Easting Northing Search Area N
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360000 .000000 359000 .000000 35800
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