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

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2.3 FIELD SURVEY • Phase 1 Habitat Survey results for the development area (Annex E) to locate any areas of identified bog habitat on the site, which could indicate significant peat accumulations; and • Aerial photography of the development area to identify areas where tree planting appears to have resulted in stunted growth which may indicate waterlogged soil conditions. Following completion of the desk-based study the areas likely to contain peat were identified and areas to be surveyed were selected. Those elements of the proposed wind farm site layout (including turbines, hardstanding areas and access tracks) that are located inside, or within approximately 100m, of potential peat deposits were included in the survey area. In addition, elements of the site layout which are located within soil associations which may contain an important peat layer were also included (see Section 3.1.3 for soil association descriptions). All accessible turbine locations were surveyed, regardless of proximity to potential peat deposits or location within peaty soil associations, in order to ‘ground truth’ the findings of the desk-based study to the greatest extent possible. A full list of those parts of the scheme included in the field survey is provided in Section 4. At each survey location, the following methodology was adopted. • For the proposed turbine locations, a 100m by 100m grid, centred on each turbine, was surveyed at a transect density of approximately 20m. This amounted to 36 hand augered probes per turbine. This survey area also included the proposed crane hardstanding areas. • For new access tracks located within potential peat deposits, the proposed track route was surveyed at 25m to 50m intervals, dependent on access constraints and whether any peat deposits were found in the area. Where accessible, three probes were taken across the proposed track route (ie centre of track and approximately 10m either side) at each survey point. In the event that peat deposits were identified, a wider pattern of lateral probing was undertaken on either side of the proposed track, in order to inform design of alternative access routes to avoid peat deposits. • For existing access tracks located within potential peat deposits, probes were taken at 50m intervals on both sides of the access track. Where access permitted, probes were taken at both 5m and 10m to 15m from each side of the track, to inform any road widening requirements and track-side cable routes. ENVIRONMENTAL RESOURCES MANAGEMENT RWE NPOWER RENEWABLES LTD 3
• Each peat probing location was recorded with a hand-held GPS, and the measured depth of peat recorded to the nearest 10cm. Thicknesses greater than 0.5m were recorded as peat. • Peat was identified based on ease of probing and visual evidence of ‘peat’ recorded on the auger on removal from the probe location. • All drainage ditches encountered during peat depth surveying were mapped in order to ascertain the current extent of drainage, which may, in turn impact on the hydrology of the area and its suitability to support peat. Survey Limitations As the scheme is located within an area of Forestry Commission Wales (FCW) upland rotational forestry, there are parts of the site to which it is currently not possible to gain safe access without significant intervention (ie brashing and felling), due to the presence of dense forestry plantation. In these areas, where possible, peat probing was conducted at the closest available location to the proposed infrastructure to provide an indication of ground conditions that may be encountered at the site itself. In those areas where no nearby access was available, further surveying will be required prior to construction of the wind farm to ensure infrastructure can be micro-sited to avoid any previously unidentified significant peat deposits. In the absence of field survey data, results of the desk-based survey are referred to in order to provide a description of the likely ground conditions at the site. 2.4 PEAT LOSS CALCULATIONS Following completion of the peat survey and confirmation of the final site layout (see Chapter 3 of the ES for details of how the peat assessment has informed the final site design), the approximate area and volume of peat that will be directly and indirectly impacted by the scheme was calculated. The calculations were undertaken following the guidance published by the Scottish Government in 2008 (1) and comprised the following steps. • Direct loss of peat was calculated based on the total area of peat that would be excavated as a result of the footprint of the proposed scheme (eg turbine foundations, crane hardstandings, access tracks and cable routes located within identified peat deposits). • Indirect loss of peat due to drainage around infrastructure components (such as access tracks and cable routes) was calculated assuming an average extent of drainage around each drainage feature. The extent of (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. ENVIRONMENTAL RESOURCES MANAGEMENT RWE NPOWER RENEWABLES LTD 4
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: 2 ASSESSMENT METHODOLOGY 2.1 INTROD
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
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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 51 and 52: CADEIRYDD/CHAIRMAN: JOHN LLOYD JONE
Page 53 and 54: Peat depth Peat depth is some refec
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Page 57 and 58: Yours sincerely Name Title Enc cc.
Page 59 and 60: It would be useful to define what i
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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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National Soil Resources Institute A
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National Soil Resources Institute e
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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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