Project Hurunui Wind Construction and Project Overview

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Project Hurunui Wind Construction Effects and Management Report Road C Road C links Road A with Road D as well as servicing turbine C1. Road C runs at a relatively flat gradient from Road A and rises at approximately 15% prior to traversing the upper slopes of a steep knoll. A maximum cut height of approximately 10m is reached as Road C traverses this knoll to access the turbine platform for Turbine C1. Beyond Turbine C1 Road C descends in a moderate gradient winding gently between knolls to Road D. Road C crosses the upper reaches of a small gully, which will require culverting, just prior to Road D. This section is illustrated on Photograph 27 in Appendix B. Road D Road D is approximately 6m wide and typically follows one of the main project ridgelines (the other being Road A) running in a north-east to south-west direction. Road D begins in the northeast section of the site at turbine D14 and terminates at the southwest section of the site at turbine D1. The route between turbines D14 and D13 descends at a maximum gradient of approximately 5% before leveling at a saddle. From the saddle Road D steadily climbs to reach the short link road to Turbine D13. A maximum gradient of approximately 20% is expected along this section prior to the link to Turbine D13. This section is illustrated on Photograph 28 in Appendix B. Road D rises gently from Turbine D13 to Turbine D12 along moderately undulating terrain. Between Turbines D12 and D11 Road D rises in an embankment fill at a maximum gradient of about 17% and a corresponding maximum embankment fill of approximately 5m in depth before leveling off just prior to Turbine D11. From Turbine D11 to Turbine D10 the horizontal alignment of the route is relatively straight and the gradients relatively flat. Minor earthworks are expected along this section. Between Turbine D10 and Turbine D7 Road D comprises sections of cuts and fills to maintain acceptable gradients as it continues to follow a broad ridgeline along gently undulating terrain. The cut heights along this section are modest and remain under 5m. Photograph 29 in Appendix B illustrates the terrain along this section of Road D. The topography changes between Turbines D7 and D2 where the ridgeline narrows and undulates sharply constraining Road D to run in a succession of sidling cuts and saddle fills to achieve acceptable grades and alignments. Photograph 30 illustrates the section of Road D between Turbines D7 and D5 while Photograph 31 shows the section of Road D in the vicinity of Turbine D5. In order to ease the gradient of Road D prior to Turbine D5 a fill embankment is proposed across a narrow saddle as shown in Photograph 31. The maximum height of this fill embankment is approximately 16m and it is expected that suitable material from nearby road cuts will be used as structural fill. From Turbines D5 to D4 Road D descends along the sharply undulating ridgeline reaching a maximum gradient of approximately 15%. The maximum cut height along this section is approximately 10m which represents the largest road cut along Road D. Between turbines D4 to D2 the ridgeline, although narrow, is less undulating and road D descends in a series of modest cuts and fills reaching a maximum gradient of 15% over a length of approximately 300m. Photograph 32 shows this section of Road D between turbines D4 and D3 while Photograph 33 shows Road D between Turbines D3 and D2. 5C-1604.02 February 2011 20
Project Hurunui Wind Construction Effects and Management Report The route between Turbines D2 and D1 is relatively flat with minor earthworks expected. Road D comprises gently undulating broad ridgelines at the northeast and southwest ends of this route but more complex and technically challenging terrain along the middle section as described above. Road D1 Road D1 provides access to Turbines D6 and D7 and runs along gently undulating terrain. Minor earthworks are expected along this route which is shown on Photographs 38 and 39 in Appendix B. This road is approximately 6m wide. Road D2 Road D2 comprises a short section of road to access Turbine D9. This route is relatively flat and only minor earthworks are expected. Road D2 and Turbine D9 are shown on Photograph 37 in Appendix B. Road E Road E at approximately 6m wide commences at the intersection with Road D between Turbines D5 and D7 and circles around the outside of steep sided localised ridge in both sidling and box cuts to a point where both Turbines E1 and E2 can be accessed along alignments with reasonable gradients. The maximum cut height is approximately 7m with a corresponding maximum gradient of approximately 15% as Road B circles outside a steep sided ridge. Road E is shown on Photographs 34 and 35 in Appendix B. Road F Road F runs along a spur running approximately perpendicular to Road D near turbine D11. A series of moderate cuts and fills characterise Road F as it descends along moderately undulating terrain to reach turbine F1. Road F is approximately 6m wide. Road G Road G is approximately 6m wide and services turbine G1 which is located along a spur running perpendicular to the Road D ridgeline as shown on Photograph 36 in Appendix B. This route descends from Road D in a moderate sidling cut reaching a maximum down slope gradient of about 12% before leveling off in a fill embankment across a narrow saddle. Road G rises at a gentle gradient of approximately 5% from this saddle in a shallow box cut to reach turbine G1. The maximum cut height along Road G is approximately 6m. Road H Road H descends along a gently undulating spur running in a southeast direction perpendicular to Road D. The majority of the earthworks are concentrated at the latter section of this route where a maximum cut height of approximately 6m is expected. Road H is shown on Photograph 32 in Appendix B. Road H is approximately 6m wide. 3.2.2 Access Road Formation Typical Cross Sections and Extent of Cuts 5C-1604.02 February 2011 21
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Project Hurunui Wind Construction and Project Overview

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