Project Hurunui Wind Construction and Project Overview

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Project Hurunui Wind Construction Effects and Management Report 7.4 On Site Project Office The location of the main project site office including stores and initial lay down area is proposed in the front paddock of the Batchelor/Daly property adjacent to the initial section of the Northern Access Road. The layout of any other temporary site offices, workshops, stores and other construction facilities, such as the concrete batching plant, will be determined following further detailed investigations of the construction and installation strategy. One security gatehouse will be located just in from the Northern Access Road, off Motunau Beach Road, to control access in and out of the site. An indicative main site office layout is shown on Drawing Sheet 203 in Appendix A (Appendix A.8 Indicative Site Office & Lay-down Area Plan). This drawing shows the indicative dimensions and layout of the proposed structures which make up the temporary site office facilities. In general the site office structures will comprise single storey sandwich panel prefabricated structures with a combined area of approximately 380m 2 . These structures are typically 2.8m high (not including the footings) and come in two standard colours, green and white. Allowance has been made for a communication mast (approximately 6m high), diesel generator and diesel fuel tank. The diesel generator and fuel tank will be located in a bunded area to retain any fuel leakage. Sewerage and waste water will be directed to a holding tank and removed off site. At completion of the construction phase these temporary buildings will be removed off site. 7.5 Bulk Fuel Storage Facility A bulk storage facility will be located at or near the site offices or close to the active construction area. The bulk storage facility will provide fuel to specialist mini tankers that will service all vehicles on site. In special circumstances where mini tanker access is not possible, a towable tanker will be used to service the vehicles. This facility is discussed in more detail in the EMP in Appendix E of this report. 7.6 On Site Batching Plant The contractor will require a concrete batching plant to minimise the number of truck trips on the public road network and increase efficiency. Photograph F25 in Appendix F shows the concrete batching plant established at Project West Wind. This photograph illustrates an indicative layout and the structures which comprise a typical concrete batching plant proposed for this project. The likely structures and facilities which comprise a typical concrete batching plant including indicative dimensions are: • Control room and storage building (6m long, 2.8m high, 2.4m wide). • Prefabricated office and amenities structure (4.8m long, 2.8m high, 3m wide). • Mobile batching plant unit which includes, but is not limited to, hoppers, aggregate storage bins, compressor, cement silos and conveyors (18m long, 4m wide, 7m high (highest point)). 5C-1604.02 February 2011 52
Project Hurunui Wind Construction Effects and Management Report • Water tank. • Aggregate stockpile area (50m x 20m). • Truck washdown area. A concrete batching plant occupies a relatively small area for a relatively short duration (approximately 5 months) of the construction period as the plant is only on site during the foundation construction stage of the construction programme. The concrete batching process proposed under this application is a dry batching process which involves mixing dry materials in the batching plant. The dry material is then transferred into a normal concrete mixing truck and only then is water added. Minor dust discharges potentially arise from the transfer of materials into the plant and again, into the mixing truck. It is envisaged that measures to contain any dust will be outlined in the EMP or relevant SEMP. Such measures are likely to include cement storage within a silo and aggregate storage bins. Given that the concrete is mixed in the truck, rather than in the batching plant, the wash down requirements associated with conventional concrete batching plants are significantly reduced. The dry batching process ensures that there are no requirements to wash down wet concrete within the batching plant. Measures to contain any dry cement spillage in the event of a batching plant failure will be outlined in the EMP or relevant SEMP. Such measures are likely to include a temporary concrete slab beneath the loading area and containment bunding around the plant incorporating a 2 stage settling pond or sediment control pond. The concrete batching plant will not be located within 100m of any permanent watercourse. On completion of the works the site office areas and batching plant areas will be stripped of any basecourse, re-topsoiled (with material which has been removed and stockpiled) and ground cover replanted as appropriate. 8 Summary and Conclusions Construction of the civil works elements for Project Hurunui Wind will require excavation; fill site creation; potential on-site extraction; potential crushing and processing of basecourse pavement materials; construction of culverts; substation and transmission line construction; internal site cable trenching and placement; concreting works and site regeneration. The key measure we have proposed to minimise the overall environmental effect of construction is to adopt the general design philosophy of following existing tracks and tops of ridges wherever possible. Following this general design philosophy will typically • Minimise the volume of excavation. • Avoid gullies & undisturbed watercourses. • Improve geotechnical aspects. 5C-1604.02 February 2011 53
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