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AECOMPuketoi Wind Farm Technical Report145.3 Soil Resistivity Test and ModellingSoil resistivity testing has not been conducted in the area for the developed design. Test data is howeveravailable near the National Grid connection point and also for similar wind farm developments in the area(specifically Tararua and Te Rere Hau wind farms). Using this available data, the soil resistivity in the area ischaracterised by a two layer profile, comprising a very high resistivity (±1500m) top layer with nominal thicknessof 2m and a high resistivity (
AECOM Puketoi Wind Farm Technical Report 15calculated. The structure locations and EPR contours are plotted on the contour maps to assist in locating theseareas with respect to the Telecom network. EPR contour radii along the 220kV transmission line route aredepicted in drawings MRP-PKT-5121 to MRP-PKT-5126. The EPR is below 430V for all collection systemstructures and turbines and therefore only the 220kV structures between the substation and grid connectionpoint are included.6.0 Electromagnetic Field Strength (EMF)As part of the EMF assessment, the Electric Field Strength (EFS) and Magnetic Flux Density (MFD) arecalculated along the 220kV transmission line and 33kV line routes at 1m above ground in areas that arereasonably accessible to the public below and next to the line. The calculations consider normal operatingconditions only. The calculated maximum values are then compared to the ICNIRP reference levels. Areas inwhich the calculated maximum values are below the reference levels are then deemed to be safe in that there isno risk of adverse health effects associated with long term EMF exposure in those areas.The highest EFS in public access areas below and next to the line is 4.95kV/m at 1m above the normal standingposition of a person. This is below the 5kV/m reference level for public exposure. The EFS of the 220kVtransmission line is depicted in Figure 3.Figure 3 Electric field strength of the 220kV transmission lineSimilarly, the highest MFD in public access areas below and next to the 220kV transmission line is 32T at 1mabove ground level for the normal standing position of a person. This value is based on 1330MVA of powertransmitted on the transmission line. The MFD of the 220kV and 33kV lines are depicted in Figure 4.
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