Project Hurunui Wind Construction and Project Overview

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Project Hurunui Wind Construction Effects and Management Report 3.2.17 Water Demands As discussed in section 3.2.6 a water supply will be required to supply any onsite concrete batching, together with other site construction activities including dust suppression, stabilization and re-vegetation, pavement construction and for any mobile crushing plant. Indicative estimates of potential water demand are summarised below in table 16. Activity Peak Daily Demand (m 3 ) Maximum Total Water Demand (m 3 ) Time Period Dust Suppression (non potable) 80 17,000 26 days per month for 8 months Stabilisation & Revegetation (non potable) 15 3,100 26 days per month for 8 months Pavement Construction (non potable) 10 1,300 26 days per month for 5 months Mobile Crushing Plant (non potable) 5 1,000 26 days per month for 8 months Turbine Foundations & Other Concreting (potable) 80 2,600 2 per week over 4 months Total 190 25,000 Table 16: Indicative Estimates of Potential Water Demand Preliminary discussions with Hurunui District Council (HDC) suggest that a significant proportion of this demand may be met via supply from the HDC water mains. Water supply from the mains and permitted abstraction rates will need to be negotiated with HDC at the appropriate time, however it is envisaged that temporary water storage tanks would be established on site to enable the buildup of water storage volume. Any shortfall in water requirement can be met via tanker delivery from offsite, from the creation of temporary stock ponds, or by stream abstraction within any consented or permitted limits. 3.3 Discharges 3.3.1 Erosion, Sediment and Dust Control We recognise that the construction of this wind farm will require extensive earthworks. However, the potential impact from erosion, sediment run-off and dust emissions are likely to be minor given the environmental management measures that will be applied. Details on the environmental management measures are discussed in detail in Appendix E (draft Environmental Management Plan) while the impact from erosion, sediment run-off and dust emission is addressed in the Ecological Values and Assessment of Effects report prepared by Boffa Miskell. One of Meridian’s prime objectives for the construction of this wind farm is to ensure that any potential adverse effects on the environment from any erosion, or sediment and dust discharges are avoided, remedied or mitigated. To achieve this Meridian will: Ensure that environmental management is a core requirement in the management process. 5C-1604.02 February 2011 40
Project Hurunui Wind Construction Effects and Management Report Prepare and implement a robust EMP and site specific SEMPs. Ensure a partnership approach between Meridian and the contractor(s). Ensure adequate resourcing of environmental management activities. Monitor and audit the project works to determine the effectiveness of the environmental management activities being undertaken. Ensure all incidents are reported to the Project Environmental Manager. The following outlines the approach that Meridian will implement to mitigate the impact of construction activities on the environment. a) Contract Requirements Although Meridian will be ultimately responsible for ensuring EMP and consent condition compliance, the construction contract will place specific responsibilities on the contractor for environmental management. The contract will require the contractor to: Comply with the Environmental Management Plan (EMP) and Supplementary Environmental Management Plans (SEMPs). Refer to Appendix E for details on the EMP and SEMPs process. Have read and comply with resource consent conditions. Take all necessary measures to ensure no adverse effects arise from dust discharges. Attend environmental compliance meetings. Ensure all plant and equipment is clean and well maintained. Foster an environmentally responsible attitude on behalf of the contractor and his employees. Follow Meridian’s Accidental Discovery Protocol for archaeological or cultural remains. b) Erosion, Sediment and Dust Control Plans The main tool for avoiding or mitigating potential adverse effects from erosion, sediment and dust discharges is by preparing and implementing SEMPs for each major component of the work. There are four steps in preparing and implementing each SEMP: Plan Preparation Separate SEMPs will be prepared for specific locations and activities (as outlined in the EMP). To get construction underway as soon as possible, plans for partial sections of works may be prepared. 5C-1604.02 February 2011 41
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