Project Hurunui Wind Construction and Project Overview

Project Hurunui Wind Construction Effects and Management Report
Table 12: Potential Basecourse Volumes and Borrow Areas
Should all basecourse be sourced on site the potential construction footprint would be
approximately 25,000m 2 . This is minimal compared to the construction footprint of 285,000
m 2 estimated for disposal fill areas associated with core site access roads and turbines
(less than 10%).
We expect the following activities and typical measures would be incorporated into the
identification, design and operation of borrow areas, as appropriate:
A site appraisal by the design/construction team, in consultation with landowners
and other relevant stakeholders, to identify suitable borrow areas in line with the
EMP. Areas of ecological value, particularly around rocky outcrops, as described in
the road layout and fill site selection (Sections 2.3 and 2.4), will be avoided.
Detailed soil investigation involving deep boring and trial pits at identified locations
to confirm suitability for material extraction.
Initial establishment of borrow area by site clearance followed by stripping and
stockpiling topsoil.
Establishing a mobile crushing plant. A typical mobile crushing plant comprises a
hopper, jaw crusher, conveyor and screen attached to a tracked wheel vehicle. An
excavator generally fills the hopper with material for processing into basecourse.
Excavation, processing and stockpiling of materials.
Fill of excess or unwanted materials at suitable fill site locations.
Mitigation to control run-off and sedimentation. Sediment control measures, as
discussed in Section 3.3 below, will be provided to manage sediment run-off during
operation and until ground cover is established after rehabilitation of the borrow
area..
Reshaping the borrow areas to blend in with the surrounding terrain, re-topsoiling
(with material which has been removed and stockpiled) and re-vegetating. Measures
will be discussed and agreed with landowner. Note that the overburden material
extracted from borrow areas and other surplus material from the civil works may be
used to fill in borrow areas prior to topsoiling.
At Project West Wind a mobile crushing plant was established on site at a borrow area near
Oteranga Bay to produce materials for core site access roading and turbine platform
basecourse. This mobile crushing plant and borrow area is illustrated on Photograph F21
in Appendix F.
3.2.8 Soil Stockpile Areas
Topsoil will be stockpiled throughout the site for re-topsoiling fill sites, platform areas and so
on. Long-term stockpiles will be temporarily stabilised by hydroseeding or hydro-mulching,
if necessary, to reduce erosion and sediment generation.
5C-1604.02
February 2011 33