SuDs Management at Glenconway Windfarm SuDS Introduction to Gael Force Renewables SuDs • Gael Force Renewables Ltd was formed in 2011 by McLaughlin & Harvey Ltd and William & Henry Alexander (Civil Engineering) Ltd to target onshore Wind Farm opportunities in GB & ROI. SuDs Gael Force Renewables – What We Do: • 150 years of Civil Engineering Experience • Gael Force offer full Design and Build Services • Early client and designer involvement so that innovative, safe, buildable solutions are developed. • At Gael Force we implement lessons learnt to ensure our teams constantly progress, develop and refine skills, methodologies and work sequences • Full time on site Environmental Professionals SuDs Project - Balmurrie Fell Wind Farm, Stranraer, South West Scotland. (7 x 1.3 MW Siemens WTG) SuDs Project – Glenconway Windfarm, Limavady, Northern Ireland (20 x 2.3MW WTG) SuDs Design to Construction SuDS Settlement Ponds SuDS Silt Fencing SuDS Clean water cut off drains SuDS Swales & check dams SuDS Breakouts SuDS Settlement Areas SuDS Monitoring Effectiveness • Water Quality testing (internal & external) • External inspections by Designers • Internal weekly inspections by Environmental Representative • SEARS (Safety Environmental Awareness Reporting Scheme). Positive and Negative issues raised by everyone on site. SuDS SuDS Water Quality Testing • External water quality testing was carried out every two weeks at 5 locations for Phase 1 and 8 locations for Phase 1 & 2 • Testing covered 21 chemical parameters and biological (macro invertebrate) monitoring • Internal samples took place daily for phase 1 and weekly for phase 2. Parameters included turbidity, dissolved oxygen, pH, temp & EC. SuDS Environmental Awareness • Water Quality results are displayed on site • Correlation between turbidity and rainfall is also presented on graphs. SuDS Toolbox Talks • Every Tuesday morning • Covers key issues such as waste, energy, water pollution • All site staff shared the responsibility SuDS Environmental Awareness SuDS Environmental Coaching Environmental Sessions to date:SuDS (McCloys) Peat Stability / Peat Slides (BLP) Archaeology (Gahan & Long) Flora and Fauna (Blackstaff) SuDS SuDS Conclusion • SuDS design must account for inclement weather conditions • SuDS design must be site specific • SuDS features must be installed prior to works starting • Very beneficial to have an on site environmental representative • Water Quality monitoring is important during construction – even visual inspection of water courses • Maintenance of SuDs Features is critical SuDS Construction-Phase Temporary SuDS: A75 Case Study Richard Collins BSc MSc AIEMA Construction Context • • • 3.67km carriageway realignment and upgrade: include earthworks, drainage and culverts, utility works, surfacing & underpass construction Existing drainage mitigation inadequate Filter drains & 4 balancing ponds with reed beds Key Environmental Aim ‘Protecting the Pow Water tributaries during construction’ Challenges & Uncertainties • Geology & soils Earthworks intensive EIA stated ‘potentially increased sedimentation’ True nature of soils Fine Clays • Spatial constraints Limited opportunity for temporary SuDS locations • Temporal Constraints Not scheduled in programme of works Resources to complete with immediate effect Costs Usual Suspects Exposed soils: ensuring capping/seeding is completed ASAP Stockpiles: limiting, stabilising Washing & washout facilities Haul roads: wheel wash operative (spatial constraints) Dewatering: sumps, releasing at suitable times Inclement weather: be prepared Water Management Strategy Liaise with local SEPA representative Alum sulphate required: minimal dosing policy Tiered, impermeable treatment zones Maintenance plan: Daily checks pH (6-8) & turbidity (<10ntu) testing Controlled release Tangible Results Permanent Pond Installation • Isolated pond • Limited opportunity for treatment • Use of existing vegetation • Lined sediment forebay • Aquatic bench in permanent pool; ecology, amenity & safety Native Species Planting Pond Edge Mix Yellow Flag Iris Water Avens Meadowsweet Benefits of bio-retention and enhanced biodiversity Learning Points Detailed pre-construction review of EIA Robust planning, management & maintenance required Micro-managed retention & release Maximise use of sub-catchments in design Thank you
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