Te Mihi Power Station Options Acoustical Assessment

Pro-Acoustics GmbH Stadtturmstrasse 19 5400 Baden Switzerland Phone +41 56 222 71 41 www.proac.ch [email protected]

Te Mihi Power Station Options

Acoustical Assessment

Document: PA-20042 Date: 2020-09-29 Revision: H-2021-07-14 Number pages: 19 Prepared: U Scholz Checked: C. Klockar

http://www.proac.ch/

Title Document Revision Page

Te Mihi Power Station - Acoustical Assessment PA-20042 H-2021-07-14 2/19

We reserve all rights in this document and in the information contained therein. Reproduction, use or disclosure to third parties without express authority is strictly forbidden. © Pro-Acoustics GmbH 2021 PRINT DATE: 21-07-14

Table of Contents

1 SUMMARY INTRODUCTION ...................................................................................... 2

2 REFERENCES ............................................................................................................ 3

3 ACOUSTICAL REQUIREMENTS ............................................................................... 3

4 PROPOSED PLANT CONFIGURATIONS .................................................................. 4

5 NOISE PREDICTION CALCULATION ........................................................................ 7

6 RESULTS .................................................................................................................. 11

7 CONSTRUCTION NOISE .......................................................................................... 13

8 CONCLUSION ........................................................................................................... 14

9 APPENDIX ................................................................................................................ 14

1 SUMMARY INTRODUCTION

Pro-Acoustics GmbH has been commissioned by Contact Energy to carry out an Acoustical Assessment of different options for the extension of the Te Mihi Power Station.

The purpose of this document is to evaluate the different options with regards to acoustical impact at the nearest noise sensitive locations and determine compliance or otherwise with the relevant noise limits specified in the Taupo District Plan.

Relevant and appropriate noise guidance and standards have been used to determine the noise impact (including the notional boundary district plan / NZS 6802).

The values presented in this report have been determined using the acoustical model Status September 2020.




2 REFERENCES

[1] Taupo district plan: https://taupo.isoplan.co.nz/eplan/

[2] NZS 6801: Acoustics – Measurement of Environmental Sound NZS 6802:1991 Assessment of Environmental Sound

[3] NZS 6802: NZS 6802:1991 Assessment of Environmental Sound

[4] NZS 6803: Acoustics Construction Noise

[5] Malcolm Hunt: “Noise Survey Report, Wairakei Binary Plant”, Report Number: 0559.05.05(A), 2005-07-11, Wellington

[6] Fabian Sepulveda: Geometrical data – Landscape of the area contour lines 2.5m resolution, format: SHP-File, 2020-08-20

[7] Fabian Sepulveda: Geometrical data – Receiver locations and addresses, format: SHP-File, 2021-07-09

3 ACOUSTICAL REQUIREMENTS

The two possible sites (referred to as THI A and THI B) on which a new geothermal power station is proposed are partially in the Industrial Environment with the balance in the Rural Environment in the Taupo District Plan. The relevant performance standards relating to noise limits specified for activities within the Rural Environment are as follows:

4b.1.8 Maximum Noise Measurement

The noise levels shall be measured in accordance with the requirements of NZS 6801:1999 Acoustics – Measurement of Environmental Sound and assessed in accordance with the requirements of NZS6802:1999 Assessment of Environmental Sound.

4b.1.9 Maximum Noise Limits

The noise level arising from any activity measured within the notional boundary of any rural environment site or within the boundary of any residential environment site, other than the site where the noise is generated, shall not exceed the following limits:

i. 7.00am – 10.00pm 55dBA Leq

ii. 10.00pm – 7.00am 40dBA Leq and 70dBA Lmax

EXCEPTIONS: for specific noise refer to following Performance Standards:

4b.1.10 Maximum Noise Construction Noise

All construction noise shall meet the requirements of New Zealand Standard NZS 6803:1999 Acoustics – Construction Noise

For the sake of completeness, it is noted that:

§ Rule 4b.1.11 Airport noise not relevant

§ Rule 4b.1.12 relates to activities within an Electricity Generation Core Site, but is not relevant to the proposed new power station options as they neither existed prior to the notification of the Taupo District Plan nor were they being approved by way of a resource consent;




§ Rule 4b.1.13 is not relevant as well drilling and testing does not form part of the current proposal; and

§ Rule 4b.1.14 provides for an exemption to compliance with the applicable noise limits for various safety features associated with the operation of activities within an Electricity Generation Core Site (subject to compliance with the requirements of section 16 of the Resource Management Act 1991).

In summary, any new geothermal power station, in combination with other sources of noise on the Te Mihi site that will exist at the time the new power station is commissioned needs to achieve a noise limit of 40dBA Leq and 70dBA Lmax at or within the boundary of a Residential Environment or the notional boundary of any dwelling in the Rural Environment.

4 PROPOSED PLANT CONFIGURATIONS

ACTUAL SITUATION TE MIHI:

The two existing steam turbines at Te Mihi have a rated capacity of 83 MW each (166 MW total).

Acoustical measurements were performed at the existing site Te Mihi in 2015. Additional measurements were taken after the optimisation of the cooling tower. Readings at the sources and in the far field (at the receptor locations and at the Contact property) were taken during all measurement campaigns. The results of these readings were used to calibrate the acoustical model of the Te Mihi site. It was possible to build up an acoustical model of the existing site and confirm the calculation results by measurements. The impact of landscape and vegetation is covered by the model with a good accuracy.

The identical calculation set up was used for the calculation of the different new options.

OPTIONS FOR THE EXTENSION TE MIHI:

The existing consents allow for the addition of a third identical steam turbine and associated equipment.

For the site Te Mihi the following options were taken into consideration:

THI_0

o This option is covered by the existing consents therefore it is not necessary to undertake acoustical calculations for THI_0 only.

o Third steam turbine unit, similar to the two existing units.

o Physical location: THI A, no works on THI B

o Generation technology: one steam turbine generator < 90MW

o Cooling system: Mechanical Draft Cooling Tower (MDCT) with 8 cells

o Acoustical basis data:

Acoustical measurements by PRO-Acoustics GmbH April 2015

For the existing site Te Mihi multiple measurements in the near field (at the sources) and in the far field were performed 2015. The results of the




measurements in the far field were used to calibrate the acoustical model for the existing two units which one is the basis for the current calculations.

THI_1

o Physical location: THI A; no works on THI B

o Turbine building similar THI_0

o Generation technology: one steam turbine generator 180MW

o Cooling system: Mechanical Draft Cooling Tower (MDCT), 13 cells, the cells have a higher thermal load compared to the THI_0 cooling tower cells (factor ca. 1.23)


Steam turbine inclusive generator and auxiliaries, acoustic data originating from measurements PRO-Acoustics GmbH at similar applications

Cladding for industrial applications

Reverberation according to measurements PRO-Acoustics GmbH at similar applications

Cooling tower – acoustic data originating from measurement data PRO-Acoustics GmbH Cooling tower Te Mihi power station with optimized gear boxes; the increased thermal load per cell was taken into consideration with an adjustment of +5dB (power 5.5 of the increased thermal load). This represents a conservative approach. For the water noise it is a linear function (less than +1dB), only for the fan an increased tip speed would result in a correction of power 5.5.

The physical location of the following options is the plot THI B. For the first calculations the new plant components were placed in the centre of THI B.

The altitude of the plot platforms are as follows:

THI A 520m

THI B 503m (NZTM)

There is an elevation between the critical receiver and THI B with an altitude of maximum 525m. This elevation results in an acoustical screening effect.

The following statements are based on the centre position in the original lot THI B (status of the modelling July 2021).

THI_2 in combination with THI_0;

o Physical location:

THI_0 at THI A

THI_2 Additional steam turbine with cooling tower at THI B,

o Generation technology: two steam turbines similar to the existing, each 90MW

o Cooling system:

THI_0 Mechanical Draft Cooling Tower (MDCT) with 8 cells






Steam turbine inclusive generator and auxiliaries, Acoustical measurements at Te Mihi power station by PRO-Acoustics GmbH April 2015

Cooling tower – acoustic data originating from measurement data PRO-Acoustics GmbH Cooling tower Te Mihi power station with optimized gear boxes

THI_3

o Physical location: THI B

o Generation technology: four binary turbines 165MW

o Cooling system: Air Cooled Condenser (ACC)


ORC turbine spectral data according to measurements at Wairakei Binary Plant [5], the higher power output is corrected by adding 3dB to the source

ACC – according to the input by a potential vendor each ACC has 60 cells (6 x 10); Spectral measurement data of the ACC of a conventional steam turbine with 160MW power output were applied. A safety margin of 6dB was added to the source because of the variation in process conditions for an ORC turbine.

THI_4 is a combination of THI_0 and THI_3 but two ORC turbines only

o Physical location:

THI_0 at THI A

THI_3 Two ORC turbines with ACC at THI B

o Generation technology:

THI_0 steam turbine similar to the two existing units 90MW

Two binary turbines 90MW

o Cooling system:


THI_4 Air Cooled Condenser (ACC)

o Acoustical basis data see THI_0 and THI_3




5 NOISE PREDICTION CALCULATION

Noise emissions in the vicinity of Te Mihi Power Station are influenced by several factors, all of which must be considered for the final attainment of "Far Field" noise levels.

Prevailing climatic conditions, i.e. wind speed

Ground and meteorological correction

Screening external to the site, i.e. vegetation and topographic situation etc.

Attenuation characteristics and insertion losses of buildings, etc.

Directivity factors applicable to certain noise sources. i.e. ACC

Plant layout effects, i.e. the use of plant items and buildings to screen or prevent noise transmission in particular directions.

The software used to calculate far field noise levels is CadnaA, Version 2021. It has been developed by DataKustik in Munich (Germany) and is based on the following published International Standards:

ISO 9613-1 and ISO9613-2: Acoustics- Attenuation of sound during propagation outdoors

Presumptions for the noise calculation: o Wind speed: 3 m/s o Wind direction: worst case (source to receiver: downwind) o Ambient temperature: 10ºC o Humidity: 70% o Ground and metrology effect: 0.9 for all areas (vegetation) o Ground and metrology effect: 0.3 for all areas inside the power plant site o Ground structure more than 13’000 contour lines with a 2.5m resolution o Number of reflections: 1

The prediction calculation is an octave band calculation in which the power plant noise sources are represented by equivalent flat face, line or point sources placed in a three-dimensional coordinate system.

Sound power levels for each (single) emitting component are based on information made available by Contact Energy or acoustical measurements taken by PRO-Acoustics. Octave band spectra assigned to the noise sources were based on benchmark data of similar projects.

The far field transmission path attenuation is estimated by means of spherical divergence, air absorption and additive correction for ground and meteorological effects, vegetation, topography and screening. Directivity and reflections are also considered in this calculation procedure.

The predicted sound pressure level at the emission point corresponds to energy mean values within the meteorological conditions usually specified for emission measurements (moderate downwind and slight temperature inversion).

The predicted attenuation within this meteorological frame is less than a long-term equivalent value. The order of magnitude of expected LAeq standard deviation is 1 to 3 dB.

After calculation of the "emission relevant" sound power level of the source, in which the correction terms for the selected attenuation are already considered, the transfer function for divergence will be determined.

The result of this calculation represents the portion of the sound pressure level emitted by each single source or group of sources at the receiver point. The total octave band sound energies arriving at the receiver are calculated by adding each single source impact on an energy basis.




The receiver locations selected constitutes the identified nearest residences and other noise sensitive locations. The coordinates of the receivers are shown in the following table (Position and addresses according [7]). Appendix 1 shows an aerial view of the area with the receiver locations close to the site marked.

ID Receiver location NZTM coordinates

X in m Y in m

R 01 104 Oruanui Rd 1’864’752 5’721’546

R 02 122 Oruanui Rd 1’864’798 5’721’747

R 03 36 Link Rd 1’865’048 5’722’418

R 04 123 Oruanui Rd 1’864’641 5’721’839

R 05 146 Oruanui Rd 1’864’885 5’722’040

R 06 43 Oruanui Rd 1’864’202 5’721’183

R 07 147 Oruanui Rd 1’864’745 5’722’036

R 08 82 Link Rd 1’865’449 5’722’601

R 09 105 Oruanui Rd A 1’864’450 5’721’751

R 10 92 Link Rd 1’865’560 5’722’686

R 11 105 Oruanui Rd B 1’864’369 5’721’761

R 12 164 Oruanui Rd 1’864’847 5’722’255

R 13 107 Oruanui Rd 1’864’448 5’721’845

R 14 24 Link Rd 1’864’897 5’722’457

R 15 173 Oruanui Rd 1’864’529 5’722’214

R 16 116 Link Rd 1’865’776 5’722’854

R 17 175 Oruanui Rd 1’864’558 5’722’327

R 18 79 Link Rd 1’865’434 5’722’803

R 19 133 Oruanui Rd 1’864’745 5’721’930

R 20 61 Link Rd 1’865’172 5’722’757

R 21 37 Link Rd 1’865’063 5’722’768

R 22 195 Oruanui Rd 1’864’266 5’722’182

R 23 205 Oruanui Rd 1’864’540 5’722’494

R 24 9 Link Rd 1’864’789 5’722’673

R 25 113 Link Rd 1’865’642 5’722’998

R 26 71 Link Rd 1’865’435 5’722’953

R 27 126 Link Rd 1’865’849 5’722’939

R 28 136 Link Rd N 1’865’940 5’723’014

R 29 33 Link Rd 1’864’997 5’722’949

R 30 137A Link Rd 1’865’741 5’723’059

R 31 215 Oruanui Rd 1’864’413 5’722’630




ID Receiver location NZTM coordinates

X in m Y in m

R 32 213 Oruanui Rd 1’864’490 5’722’554

R 33 217 Oruanui Rd 1’864’451 5’722’753

R 34 234 Oruanui Rd 1’864’586 5’722’830

R 35 254 Oruanui Rd 1’864’729 5’722’958

R 36 159 Oruanui Rd 1’864’097 5’721’921

R 37 139 Link Rd 1’865’649 5’723’229

R 38 136 Link Rd S 1’866’024 5’722’886

R 39 252 Oruanui Rd 1’864’505 5’723’036

R 40 256 Oruanui Rd 1’864’573 5’723’131

R 41 260 Oruanui Rd 1’864’423 5’723’163

R 42 170 Link Rd 1’866’271 5’723’174

R 43 429 NZ State Highway 1 1’867’073 5’722’992

R 44 250 Link Rd 1’866’902 5’723’248

R 45 144 Link Rd 1’866’192 5’722’986

R 46 269 Oruanui Rd 1’864’182 5’723’012

R 47 239 Oruanui Rd 1’864’417 5’722’827

R 48 194 Tukairangi Rd 1’864’087 5’719’177

R 49 95 E. Glade Rd 1’863’561 5’719’516

R 50 65 E. Glade Rd 1’863’561 5’719’332

R 51 1450 Mapara Rd 1’862’910 5’720’315

R 52 120 Tukairangi Rd 1’865’110 5’719’147

R 53 67 E. Glade Rd 1’863’595 5’719’421

R 54 39 E. Glade Rd 1’863’655 5’719’172

R 55 136 Tukairangi Rd 1’864’652 5’719’144

R 56 92 E. Glade Rd 1’863’628 5’719’678

R 57 68 E. Glade Rd 1’863’657 5’719’605

R 58 158 Tukairange Rd 1’864’465 5’719’165

A total of almost 300 different single sources, representing individual noise sources of the plant, were utilized to determine the sound emitted from the existing and proposed facilities over a grid of more than 120’000 points in the surroundings. Using an interpolation procedure, noise contour maps for day and night operation were calculated.

The following pictures show a 3-D view into the acoustical model for different options.




Figure 1; Te Mihi Power station and THI_1, 3-D view from South West

Figure 2; Te Mihi Power station and THI_0 and THI_2, 3-D view from South West

Figure 3; Te Mihi Power station and THI_0 and THI_3, 3-D view from North

Te Mihi Receiver

locations

THI_1 with

cooling tower

Existing THI station with

cooling tower

THI_0 with

cooling tower

THI_2 with cooling tower

Existing THI with

cooling tower

THI_3

4 ORC with ACC




Figure 4; Te Mihi Power station and THI_0 and THI_4, 3-D view from South West

6 RESULTS

The following configurations were calculated:

Existing Power Station Te Mihi

THI_1 – Noise Contour Map – Appendix 2

o Existing Power Station Te Mihi

o THI_1 - 180MW Steam turbine; cooling tower with 13 cells

THI_2 – Noise Contour Map - Appendix 3


o THI_0 – 90MW Steam turbine; cooling tower with 8 cells

o THI_2 – 90MW steam turbine; cooling tower with 8 cells

THI_3 - Noise Contour Map - Appendix 4


o THI_3 – 165MW four Binary Turbines with ACC

THI_4 – Noise Contour Map - Appendix 5


o THI_0 – 90MW Steam turbine; cooling tower with 8 cells

o THI_3 – 90MW two Binary Turbines with ACC

At the receiver locations the following sound pressure level results by the operation of the different options:

THI_4

2 ORC with ACC

THI_0 with

cooling tower




ID Receiver location Sound pressure level at receiver locations in dB(A)

Existing THI THI_1 THI_2 THI_3 THI_4

R 01 104 Oruanui Rd 36.5 38.9 37.6 39.1 38.5

R 02 122 Oruanui Rd 34.7 37.9 36.3 37.8 37.3

R 03 36 Link Rd 31.7 35.1 33.6 35.9 35.4

R 04 123 Oruanui Rd 32.6 36.0 34.3 36.4 35.6

R 05 146 Oruanui Rd 32.2 36.1 34.2 36.3 35.4

R 06 43 Oruanui Rd 30.2 35.2 33.2 35.4 35.4

R 07 147 Oruanui Rd 31.5 35.3 33.5 35.8 35.0

R 08 82 Link Rd 31.1 33.9 32.9 35.5 34.9

R 09 105 Oruanui Rd A 31.1 35.1 33.3 35.6 35.2

R 10 92 Link Rd 31.3 33.8 32.9 35.4 34.8

R 11 105 Oruanui Rd B 31.2 35.0 33.3 35.4 35.1

R 12 164 Oruanui Rd 30.9 34.7 33.0 35.4 34.6

R 13 107 Oruanui Rd 31.1 34.9 33.2 35.4 35.0

R 14 24 Link Rd 31.1 34.6 33.1 35.1 34.7

R 15 173 Oruanui Rd 31.4 34.4 33.0 35.0 34.5

R 16 116 Link Rd 30.6 32.9 32.3 34.5 33.9

R 17 175 Oruanui Rd 30.8 34.0 32.6 34.5 34.1

R 18 79 Link Rd 29.7 32.9 31.6 34.2 33.5

R 19 133 Oruanui Rd 32.1 35.6 33.8 35.1 34.3

R 20 61 Link Rd 29.5 33.0 31.5 34.0 33.5

R 21 37 Link Rd 29.7 33.5 31.5 33.8 33.3

R 22 195 Oruanui Rd 29.7 33.1 31.5 33.7 33.2

R 23 205 Oruanui Rd 29.8 33.3 31.8 33.7 33.3

R 24 9 Link Rd 29.4 33.2 31.5 33.5 33.1

R 25 113 Link Rd 29.6 32.0 31.4 33.5 32.9

R 26 71 Link Rd 29.0 32.6 30.9 33.4 32.7

R 27 126 Link Rd 27.6 30.8 30.1 33.1 32.2

R 28 136 Link Rd N 28.2 31.0 30.6 32.9 32.2

R 29 33 Link Rd 28.7 32.5 30.9 32.8 32.4

R 30 137A Link Rd 28.2 30.9 30.4 32.8 32.0

R 31 215 Oruanui Rd 28.7 32.2 30.7 32.6 32.2

R 32 213 Oruanui Rd 26.6 31.3 29.4 32.2 31.5

R 33 217 Oruanui Rd 28.3 31.8 30.4 32.2 31.8

R 34 234 Oruanui Rd 27.9 31.5 30.1 32.1 31.6

R 35 254 Oruanui Rd 27.6 31.4 30.0 31.9 31.4




ID Receiver location Sound pressure level at receiver locations in dB(A)

Existing THI THI_1 THI_2 THI_3 THI_4

R 36 159 Oruanui Rd 26.7 29.7 28.9 31.6 30.7

R 37 139 Link Rd 24.4 28.4 28.0 31.0 29.9

R 38 136 Link Rd S 27.8 30.9 30.1 31.9 31.0

R 39 252 Oruanui Rd 26.6 30.2 29.0 30.9 30.4

R 40 256 Oruanui Rd 26.4 30.2 28.8 30.7 30.1

R 41 260 Oruanui Rd 25.8 29.5 28.3 30.1 29.6

R 42 170 Link Rd 25.2 28.5 28.5 30.6 29.5

R 43 429 NZ State Highway 1 21.9 26.2 26.4 29.8 28.4

R 44 250 Link Rd 21.5 25.6 26.1 29.2 28.0

R 45 144 Link Rd 25.9 29.3 28.7 30.1 29.1

R 46 269 Oruanui Rd 22.2 26.6 25.7 28.7 27.3

R 47 239 Oruanui Rd 23.2 27.2 26.2 27.8 26.4

R 48 194 Tukairangi Rd 21.1 26.6 24.6 28.2 25.6

R 49 95 E. Glade Rd 19.9 25.6 23.1 27.5 24.5

R 50 65 E. Glade Rd 19.7 25.5 22.9 26.8 24.1

R 51 1450 Mapara Rd 19.3 25.0 21.7 24.8 24.1

R 52 120 Tukairangi Rd 20.2 25.8 24.1 26.4 24.5

R 53 67 E. Glade Rd 17.8 23.0 21.6 26.6 23.1

R 54 39 E. Glade Rd 17.6 23.2 21.2 25.1 22.3

R 55 136 Tukairangi Rd 18.0 23.7 22.5 24.6 22.8

R 56 92 E. Glade Rd 17.4 22.1 20.2 21.0 20.5

R 57 68 E. Glade Rd 14.8 19.7 18.2 20.4 18.8

R 58 158 Tukairange Rd 13.0 18.9 17.6 20.2 18.2

The requirement of 40dB(A) is fulfilled at all receiver locations.

7 CONSTRUCTION NOISE

The construction of the new geothermal power station will be able to comply with Rule 4b.1.10 relating to construction noise.

All construction noise shall meet the requirements of New Zealand Standard NZS 6803:1999 Acoustics – Construction Noise. The limits of table 2 of the standard will be applied during construction and commissioning of the plant.




8 CONCLUSION

Pro-Acoustics GmbH has carried out an Acoustical Assessment of different options for the extension of the Te Mihi Power Station.

In this document the different options were evaluated with regards to acoustical impact at the identified nearest noise sensitive locations.

The results from the noise prediction calculations show that it is possible to achieve compliance with the noise limits specified in the Taupo District Plan at all identified nearest receivers.

The values presented in this report have been determined using the acoustical model Status July 2021.

9 APPENDIX

Appendix 1: Receiver locations Te Mihi

Appendix 2: Noise contour map Existing Te Mihi Station and THI_1







Appendix 1: Receiver locations





R 01

R 02

R 03

R 04

R 05

R 06

R 07

R 08

R 09

R 10

R 11

R 12

R 13

R 14

R 15

R 16

R 17

R 18

R 19

R 20R 21

R 22

R 23

R 24

R 25

R 26 R 27

R 28

R 29

R 30

R 31

R 32

R 33

R 34

R 35

R 36

R 37

R 38

R 39

R 40R 41 R 42

R 45R 46

R 47

1864500

1864500

1865000

1865000

1865500

1865500

1866000

1866000

1866500

1866500

5720000

5720000

5720500

5720500

5721000

5721000

5721500

5721500

5722000

5722000

5722500

5722500

5723000

5723000

5723500

5723500

15 <= ... < 20

20 <= ... < 25

25 <= ... < 30

30 <= ... < 35

35 <= ... < 40

40 <= ... < 45

45 <= ... < 50

50 <= ... < 55

55 <= ... < 60

60 <= ... < 65





35

35

40

45 50

R 01

R 02

R 03

R 04

R 05

R 06

R 07

R 08

R 09

R 10

R 11

R 12

R 13

R 14

R 15

R 16

R 17

R 18

R 19

R 20R 21

R 22

R 23

R 24

R 25

R 26 R 27

R 28

R 29

R 30

R 31

R 32

R 33

R 34

R 35

R 36

R 37

R 38

R 39

R 40R 41 R 42

R 45R 46

R 47

1864500

1864500

1865000

1865000

1865500

1865500

1866000

1866000

1866500

1866500

5720000

5720000

5720500

5720500

5721000

5721000

5721500

5721500

5722000

5722000

5722500

5722500

5723000

5723000

5723500

5723500

15 <= ... < 20

20 <= ... < 25

25 <= ... < 30

30 <= ... < 35

35 <= ... < 40

40 <= ... < 45

45 <= ... < 50

50 <= ... < 55

55 <= ... < 60

60 <= ... < 65





40 45

35

50

R 01

R 02

R 03

R 04

R 05

R 06

R 07

R 08

R 09

R 10

R 11

R 12

R 13

R 14

R 15

R 16

R 17

R 18

R 19

R 20R 21

R 22

R 23

R 24

R 25

R 26R 27

R 28

R 29

R 30

R 31

R 32

R 33

R 34

R 35

R 36

R 37

R 38

R 39

R 40R 41 R 42

R 45R 46

R 47

1864500

1864500

1865000

1865000

1865500

1865500

1866000

1866000

1866500

1866500

5720000

5720000

5720500

5720500

5721000

5721000

5721500

5721500

5722000

5722000

5722500

5722500

5723000

5723000

5723500

5723500

15 <= ... < 20

20 <= ... < 25

25 <= ... < 30

30 <= ... < 35

35 <= ... < 40

40 <= ... < 45

45 <= ... < 50

50 <= ... < 55

55 <= ... < 60

60 <= ... < 65





35

30

4550 55

40

R 01

R 02

R 03

R 04

R 05

R 06

R 07

R 08

R 09

R 10

R 11

R 12

R 13

R 14

R 15

R 16

R 17

R 18

R 19

R 20R 21

R 22

R 23

R 24

R 25

R 26R 27

R 28

R 29

R 30

R 31

R 32

R 33

R 34

R 35

R 36

R 37

R 38

R 39

R 40R 41 R 42

R 45R 46

R 47

1864500

1864500

1865000

1865000

1865500

1865500

1866000

1866000

1866500

1866500

5720000

5720000

5720500

5720500

5721000

5721000

5721500

5721500

5722000

5722000

5722500

5722500

5723000

5723000

5723500

5723500

15 <= ... < 20

20 <= ... < 25

25 <= ... < 30

30 <= ... < 35

35 <= ... < 40

40 <= ... < 45

45 <= ... < 50

50 <= ... < 55

55 <= ... < 60

60 <= ... < 65

Documents

Te Mihi Power Station Options Acoustical Assessment