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

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Track Section Existing access track to W of Turbine 11 Adjusted access track corner to S of Turbine 11 Access track junction between turbines 22, 23 and 26 New access track section at junction to Turbine 26 Length of track surveyed NSRI soil Association BGS superficial deposits and underlying (m) bedrock 450 Wilcocks 2 Glacial till and peat deposits over Nantglyn Flags mudstone and siltstone bedrock 100 Wilcocks 2 Glacial till and peat deposits over Nantglyn Flags mudstone and siltstone bedrock 800 Wilcocks 2 No superficial deposits, glacial till and peat deposits over Denbigh grits mudstone, siltstone and sandstone 50 Wilcocks 2 Peat deposits over Denbigh grits mudstone, siltstone and sandstone Topography Phase 1 habitat survey Slopes gently N Slopes gently N Slopes downwards from W and E to depression around watercourse near junction Slopes down to N Coniferous plantation Coniferous plantation Heathland, marshy grassland and coniferous plantation Coniferous plantation Field Survey Completed No. Access constrained due to dense forestry. No. Access constrained due to dense forestry. Yes. Probing undertaken to both sides of existing access track where access allowed Yes. Probing undertaken along proposed route of access track Results Potential peat avoidance measures Desk study suggests existing access track crosses edge of peat deposit approx 90m in length on both sides of track. Probes in south of deposit suggest peat
3.2.4 Peat Loss Calculations Direct and indirect loss of peat as a result of construction has been calculated based on the survey results outlined in Section 3.2.2 and 3.2.3 above and using the methodology outlined in Section 2.4. To facilitate calculation of indirect loss due to drainage, the extent of drainage has been estimated based on the observed ground conditions in the development area and published research. Artificial drainage can result in a reduction in the level of the water table within peat deposits, which in turn may lead to a loss of habitat structure and loss of carbon from the accumulated peat. The reduction in water level will be greatest closest to the drainage feature and will decrease rapidly with distance, depending on hydraulic conductivity. The Scottish Government (1) guidance gives a range of drainage extent of between 1.5m and 50m depending on hydraulic conductivity. For the scheme in question it is considered that, as the peat on site has already been substantially modified by forestry activities (such as tree planting, installation of drainage and deep ploughing) the water table will already be significantly lowered within the peat and is unlikely to be further affected by the majority of construction works, except for deep excavations (eg for turbine foundations). A maximum extent of drainage of 15m has therefore been used in the calculations of indirect loss, based on research undertaken in a drained, tree-covered bog in Quebec (2) . Table 3.4 shows the total area and volume of peat that will be lost directly and indirectly as a result of the scheme, broken down per infrastructure <strong>com</strong>ponent located within, or in close proximity to, an identified peat deposit. It should be noted that the exact locations of crane hardstanding areas, road widening requirements and cable routes will not be confirmed until the detailed design stage, and the turbine locations will have a mirco-siting allowance of up to 50m. The routing of spur roads to the final turbine position will also be determined during detailed design. As a precautionary approach, the peat loss calculations have therefore assumed the maximum possible encroachment of infrastructure within identified peat deposits, in order to provide a reasonable ‘worst case’ estimate of total peat loss. (1) Nayak, D.R., Miller, D., Nolan, A., Smith, P. and Smith, J. (2008). Calculating carbon savings from wind farms on Scottish peat lands - a new approach. Scottish Government, June 2008. (2) Prevost, M., Belleau, P. and Plamondon, A.P. (1997). Substrate conditions in a treed peat land: Responses to drainage. Ecoscience 4, 543-544. ENVIRONMENTAL RESOURCES MANAGEMENT <strong>RWE</strong> NPOWER RENEWABLES LTD 22
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 and 12: CONTENTS 1 INTRODUCTION 1 2 ASSESSM
Page 13 and 14: 2 ASSESSMENT METHODOLOGY 2.1 INTROD
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
Page 21 and 22: Figure 3.3 Wilcocks 2 Comprising So
Page 23 and 24: y their peat-forming vegetation). I
Page 25 and 26: Table 3.2 Peat survey results at pr
Page 27 and 28: BGS superfiical Phase 1 Turbine NSR
Page 29 and 30: BGS superfiical deposits and underl
Page 31: Table 3.3 Existing and new access t
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
Page 41 and 42: CCW are of the view that the impact
Page 43 and 44: Undertaking'. Within this document
Page 45 and 46: Section 42 and LBAP Species/Habitat
Page 47 and 48: We recommend the inclusion of detai
Page 49 and 50: APPENDIX 1: EUROPEAN PROTECTED SPEC
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
Page 57 and 58: Yours sincerely Name Title Enc cc.
Page 59 and 60: It would be useful to define what i
Page 61 and 62: • If peat is identified through d
Page 63 and 64: 1 PHOTOLOG OF SURVEY LOCATIONS Figu
Page 65 and 66: Figure 1.5 Turbine 4 Figure 1.6 Tra
Page 67 and 68: Figure 1.9 Track past Turbine 7 Fig
Page 69 and 70: Figure 1.13 Turbine 11 - Dense fore
Page 71 and 72: Figure 1.17 Turbine 13 Figure 1.18
Page 73 and 74: Figure 1.21 Turbine 19 Figure 1.22
Page 75 and 76: Figure 1.25 Track past Turbine 25 F
Page 77 and 78: Appendix 3 Detailed Results Figures
Page 79 and 80: KEY: 0.15m 0.08m 0.2m 0.28m 0.18m 0
Page 81 and 82: 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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National Soil Resources Institute A
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National Soil Resources Institute 1
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National Soil Resources Institute P
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National Soil Resources Institute a
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National Soil Resources Institute B
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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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