Environmental Noise Assessment Corder Park Pump...

Environmental Noise Assessment Corder Park Pump Station Nelson City Council

Report ref:

220423-108

21 June 2012

Revision 2

Document prepared by: Aurecon New Zealand Limited Level 4 139 Carlton Gore Road Newmarket Auckland 1149 New Zealand T: +64 9 520 6019 F: +64 9 524 7815 E: [email protected] W: aurecongroup.com

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Document ID: Hm120614hm corder park environmental noise assessment V3.docx

Rev No Date Revision details Typist Author Verifier Approver

0 16/11/2011 DRAFT FOR INTERNAL REVIEW HM HM FMP

1 14/06/2012 UPDATED REPORT FOR REVISED SITE LAYOUT HM HM FMP DW

2 21/06/2012 MINOR UPDATE HM HM FMP DW

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Environmental Noise Assessment

Project 220423-108 | File Hm120614hm corder park environmental noise assessment V3.docx | Revision 1 Aurecon Page i

Contents

1. Introduction 1

2. Assessment of site 2

3. Environmental noise criteria 3

4. Schedule of Equipment 4

5. Assessment of environmental noise emissions 7

6. Conclusion 8

Appendix A

Equipment data sheets

Appendix B

Planning maps

Appendix C

Predicted noise contours

Appendix D

Noise monitoring results


Project 220423-108 | File Hm120614hm corder park environmental noise assessment V3.docx | Revision 1 Aurecon Page 1

1. Introduction

This report details the environmental noise assessment for the proposed pump station located at Corder Park in Nelson. The site is located adjacent Atawhai Drive/ State Highway 6 in Atawhai, Nelson. An aerial image showing the site location relative to the surrounding properties can be seen in Figure 1 below. Distances are provided to the location of the standby generator which is expected to be the dominant noise source on site.

Figure 1 Aerial photo

An existing pump station is currently located on the site which is to be converted to a storage chamber. The proposed development would include four new pumps located in a dry well of depth 5.3m. A generator is also located on site in a below ground Generator & Control Room. Cross sections of the development can be seen in the Aurecons drawings RC004 RC012.

The development will be predominantly underground with batters to the west, south and east sides.

Site location

Existing exchange building

Nearest resident

Existing pump station

Noise monitoring location

Kindergarten

60 m

30 m



2. Assessment of site

A site visit was conducted on Tuesday 29 November 2011 to assess the site and install a noise logger to conduct unattended noise measurements.

Noise measurements were taken over a 24 hour period using an ARL 316 Type 1 noise logger. The logger was installed approximately 20 metres from the roadway and 10 metres from the existing pump station on site. The location of the logger can be seen in Figure 2.

Figure 2 Location of noise logger on site

The noise environment on the site is dominated by sporadic high speed traffic on Atawhai Drive (State Highway 6) which is typically constant at all hours. Measurements were carried out in general accordance with the provisions of the relevant New Zealand Standards, NZS 6801:1977 Methods of Measuring Noise and NZS 6801:2008 Acoustics measurement of environmental sound. No rain was recorded over the measurement period, there were significant overcast periods. The logger was calibrated before and after measurements. A summary of the recorded noise logger data is shown below in Table 1. Full logging results can be seen in the Appendix D. It can be seen in the noise monitoring charts that noise levels are reasonably constant throughout the night time period, with only the period around 2.00am showing significantly reduced noise levels. Nose levels measured at the logger location are expected to be generally representative of the noise levels at the nearest residents.



Table 1 Corder park noise logging results

Corder Park Noise monitoring results 29/11/2011 30/11/2011

L90, 15min dBA Leq,15 min dBA L10, 15 min dBA Lmax, 15 min dBA

Daytime

7.00am to 10.00pm

46 66 70 81

Night time

10.00pm to 7.00am

34 57 53 78

The background (L90) noise levels measured at the monitoring location are considered to be representative of those at the residential and kindergarten receivers. However, as the nearest residence is approximately 80 metres further from the highway than the monitoring location, the Leq and L10 levels are expected to be approximately 14 dBA lower at the residence than the measured results.

Table 2 Predicted noise levels at residence

Predicted noise levels at residence

Leq, 15 min dBA L10, 15 min dBA

Daytime

7.00am to 10.00pm 52 56

Night time

10.00pm to 7.00am 43 39

3. Environmental noise criteria

The site is located in the Nelson City Council area and is subject to the conditions stipulated in the Nelson Resource Management Plan. The applicable planning maps and legends for the site can be seen in Appendix B.

The site is zoned as Open Space Recreation with Coastal Environment and Scheduled Site overlays. The Nelson Resource Management Plan for Open Space Recreation Zones stipulates:

OSr37.1: Noise levels measured at or within the boundary of any site in the residential zone must not exceed:

Day time (7am to 10pm Monday to Friday and 9am to 10pm Saturdays Sundays and Public Holidays)

L10 55 dBA

Other times

L10 45 dBA

Lmax 75 dBA

The site is expected to operate 24 hours a day, seven days per week and should therefore comply with the stricter other times criteria.

It is generally accepted that noise emissions from emergency equipment may exceed the Management Plan levels by 5 dBA.



4. Schedule of Equipment

The following equipment is proposed on the site, the location of each item can be seen in Figure 3.

Figure 3 Proposed site layout

Figure 4 Proposed site cross section



Table 3 Schedule of proposed equipment

Item of equipment

Number Location Further information Total sound pressure level, L10 dBA

Pump 2 Underground Pump Room 797l/s, 50 Hz, 200kW,

990rpm 77 @ 5 metres

1

Pump 2 Underground Pump Room 307l/s, 50Hz, 20kW,

735rpm 67 @ 5 metres

1

Generator 1 Underground Generator and Control Room

500 kVA 65 dBA @ 7 metres2

75 dBA @ 7 metres3

Transformer 1 External 500 kVA 41 dBA @ 5 metres4

Notes: 1 Based on the speed and power rating of the pumps and the prediction procedure detailed in Engineering Noise Control, David

A Bies and Colin H Hanson, Fourth Edition, Spoon Press 2009. 2POWERGen Super Silent Canopy Type, details in Appendix A

3 POWERGen Soundproofed Type, details in Appendix A

4 Based on AS/NZS 60076.10:2009 Standard Limit and the power rating of the transformer. Sound Power level of 63 dBA.

Noise emissions from the odour control unit proposed to be located to the north of the new buildings are expected to be insignificant.

Noise spectra for the various items of equipment have been assumed for this assessment based on the prediction methodology in Engineering Noise Control by Bies and Hanson (2009) and test data for comparable units provided by POWERGen. A summary of the maximum noise spectra are shown in Figure 5. All equipment suppliers must ensure that selected equipment does not exceed the specified values.

Figure 5 Equipment sound power levels

30

35

40

45

50

55

60

65

70

75

80

85

90

95

100

105

110

32 63 125 250 500 1000 2000 4000 8000

So

un

d p

ow

er

leve

l d

B

Frequency Hz

Predicted sound power levels for equipment

Generator

Transformer

20kW Pump

200kW Pump

Generator exhaust Super Silent Type



Based on the equipment data, noise emission calculations are based on a maximum reverberant noise level of 90 dBA L10 in the Generator room (super silent model), and 112 dBA L10 in the pump room.

The pumps are located in a 5.3 metre dry pit. The pit, together with the concrete roof provides significant acoustic shielding. Appropriate acoustic treatment will be provided to the access doors and hatches. Access hatches have been assumed to be minimum 3mm steel. It is understood that no ventilation openings are required for the pump room.

The generator and control room is also to be located underground with a concrete roof. Doors are provided to the north side faade. Appropriate acoustic treatment will be provided to the access doors and ventilation openings in the form of acoustic seals and construction material to adequately control noise emissions. It has been assumed that ventilation inlet and exhaust ducts will be provided, with an area of 1m

2 each. Attenuators will be provided to the ventilation air paths, and the genset will be fitted

with appropriate acoustic exhaust silencers to achieve the environmental noise emission criteria. For the purposes of this assessment, it has been assumed that a 900mm long 50% open area attenuator will be required to both the intake and exhaust ventilation paths. Specification of these attenuators will be conducted in the detailed design stage when ventilation fans have been selected. Specification of the exhaust silencers will be developed with assistance from the generator supplier to ensure noise emissions from the exhausts does not exceed 65dBA at 7 metres.

The generator would be tested periodically during the daytime periods. It is expected that the only night time operation would be during an emergency.

The transformer is located outside, to the south of the proposed new building.

The site will be unoccupied and therefore negligible impact from increased traffic noise is expected.



5. Assessment of environmental noise emissions

A computational model of the site was developed using the environmental noise emission software SoundPLAN 6.4. The model incorporates noise sources, buildings, surrounding terrain and makes predictions of noise emissions to the surrounding receivers. Predicted noise contours are attached in Appendix C. Predictions of noise emissions have been made in general accordance with NZS6082:2008. As shown in the contours, noise emission levels at the site boundary are predicted to comply with the DP noise limit of 45 dBA L10.

Noise propagation from the site was predicted using the ISO9613-2:1996 model under calm meteorological conditions.

The predicted noise levels from the proposed development at the nearest sensitive receivers are shown below.

Table 4 Predicted noise emission levels

Location Standard Operation L10 dBA

Emergency Operation L10 dBA

District Plan noise limits L10 dBA

Normal operation

Day Night

Kindergarten



6. Conclusion

An acoustic assessment of the proposed pump station at Corder Park in Nelson has been conducted. The assessment included noise measurements on site and prediction of noise emissions from the proposed equipment.

Noise emissions from the proposed site have been predicted using SoundPLAN 6.4 computational noise prediction software. Acoustic mitigation measures in the form of building construction and ventilation treatment for the Generator Room have been provided in order to reduce noise emissions from the site to within the Nelson City Plan requirements. Provided the suitable noise mitigation measures are incorporated into the design, noise emissions from the development can comply with the Nelson City Plan requirements.

Appendix A Equipment data sheets

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heath.millerText Box0.5 MVA

Appendix B Planning maps

32

31

30

ATAW

HAI D

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ATAWHA

I CRES

WAS

TNEY

TER

DODSON VLY RD

RAINBOW DR

WERNETH ST

NOEL

JONE

S DR

CLOVE

LLY S

T

TUI GLEN RD

JACKSON ST

MARY

BANK

RD

JOLLIE ST

GIPPS ST

WINT

ON P

L

MANA

HTS

TRES

ILLIAN

AVE

GLENBRAE ST

DTR4

DTE1

Oldham

Crk

Nelson Haven

Coastal Marine Area (CMA) Is,Unless Otherwise Zoned,All Areas Below AssumedMHWS (See Legend)

MA

P 4

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: T

he

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able

Nea

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t P

age

39

41

40

4

3

5

1:5,000MAP 4

Maps Generated by Nelson City Council's GIS SystemThis Publication is Copyright Reserved by Nelson City Council - Cadastral Information derived from the Crown Records System.

CROWN COPYRIGHT RESERVED - Approved for internal reproduction by Nelson City Council

NELSON RESOURCE MANAGEMENT PLAN

OPERATIVE IN PART (EXCLUDING REGIONAL COASTAL PLAN)1 SEPTEMBER 2004

heath.millerLine

heath.millerText BoxSITE LOCATION

#

#

(((((((

(((((((

(((((((

(((((((

#

#

##

G

!

G

1:5,0001:2,500 1:25,0001:10,000

66kV ETL33kV ETL

220kV ETL110kV ETL

Marine ASCV

Flood Overlay

Launching Ramps

Designation Area

Grampians S.R.O.

Services Overlay

Map Limit Outlines

Heritage Precincts

Inundation Overlay

Road To Be Stopped

Nelson City Boundary

Fault Hazard Overlay

Conservation Overlay

Wakefield Quay Precinct

Land Management Overlay

Potential Quarry Overlay

Tahunanui Slump Core S.R.O.

Port Effects Control OverlayHeritage and Landscape Trees

Tahunanui Slump Fringe S.R.O.

Airport Effects Limit Overlay

Port Nelson Ltd Coastal Permit

Heritage and Landscape Woodland

Airport Effects Control OverlayHeritage Building, Object, Place

Airport Effects Advisory Overlay

Bridge Location - (No Rules Apply)

Public Car Parking Square and Places

Proposed Road (IndicativeAlignment Only)

Riparian Overlay (See App6and Zone Chapters)

Outer Limit of AirportEffects Control Overlay

Outer Limit of AirportEffects Advisory OverlayFloodpath Overlay (Also See Note 1,Flood Path Table)

PLANNING MAPS LEGEND(LEFT HAND MAPS ONLY)NOTE 1: Flood Paths not defined on the Planning Maps are shown in a table in the front page of the PlanningMaps.OVERLAYS OVERLAYSAREAS OF SIGNIFICANT CONSERVATIONVALUE (ASCV)

AIRPORT EFFECTS OVERLAYSSee Map A4.1for Extent of Overlays

NATURAL HAZARD OVERLAYS

SLOPE RISK OVERLAYS (S.R.O.)

FLOOD HAZARD OVERLAYS

PORT EFFECTS OVERLAY

ELECTRICAL TRANSMISSION LINES (ETL)

HERITAGE OVERLAYS

DESIGNATIONS

SYMBOLS

MAP EXTENT SYMBOLS

LEGEND

: LEFT

HAND

MAPS

!"$

28 September 2009 Nelson Resource Management Plan

ATAW

HAI D

R

ATAWHA

I CRES

WAS

TNEY

TER

DODSON VLY RD

RAINBOW DR

WERNETH STNO

EL JO

NES D

R

TUI GLEN RD

JACKSON ST

MARY

BANK

RD

JOLLIE ST

GIPPS ST

CR8

NP37

NP73

Nelson Haven

Coastal Marine Area (CMA) Is,Unless Otherwise Zoned,All Areas Below AssumedMHWS (See Legend)

HE

LP

TIP

: T

he

Leg

end

Slid

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Bac

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ove

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Flo

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Tab

le N

ear

Fro

nt

Pag

eM

AP

4

1:5,000

NELSON RESOURCE MANAGEMENT PLAN

OPERATIVE IN PART (EXCLUDING REGIONAL COASTAL PLAN)1 SEPTEMBER 2004

Maps Generated by Nelson City Council's GIS SystemThis Publication is Copyright Reserved by Nelson City Council - Cadastral Information derived from the Crown Rrecords System.

CROWN COPYRIGHT RESERVED - Approved for internal reproduction by Nelson City Council

MAP 4

39

41

40

42

4

3

576

heath.millerLine

heath.millerText BoxSITE LOCATION

RURAL

1:5,0001:2,500 1:25,0001:10,000

INDUSTRIAL

RESIDENTIAL

Leisure Area

CONSERVATION

Higher Density

INNER CITY-FRINGE

Scheduled Streets

Landscape Overlay

Map Limit Outlines

INNER CITY -CENTRE

View Shaft Overlay

Lower Density Area

SUBURBAN COMMERCIAL

Archaelogical Sites

Nelson City Boundary

OPEN SPACE RECREATION

Archaelogical Overlay

Intense Development Area

Lower Density Area (Stoke)

Coastal Environment Overlay

Lower Density Small Holdings Area

Nayland Road South Industrial Area

Higher Density Small Holdings Area

Public Car Parking Squares and Places

Scheduled Site (SEE Chapter 3and Zone Chapters)

Assumed MHWS and Landward Boundary of the CMA (SEE Note 2)

PLANNING MAPS LEGEND(RIGHT HAND MAPS ONLY)

ZONES OVERLAYS

HERITAGE OVERLAYS

SYMBOLS

NOTE 1: Zones are Represented on Right Hand Facing Sheet Only.NOTE 2: Mean High Water Springs (MHWS) as shown on these Planning Maps are indictative only. Where rulesin this Plan require MHWS to be located, This must be done by survey.

CAPITALS = ZONE

Lower Case = Areas Within Zone

MAP EXTENT SYMBOLS

LE

GE

ND

: R

IGH

T H

AN

D M

AP

S

Bridge Location - (No Rules Apply)


Project 220423-108 | File Hm120614hm corder park environmental noise assessment V3.docx | Revision 1 Aurecon Page i

Appendix C Predicted noise contours

PUMPROOM

WETWELL

GEN.ROOM

LEGEND:PREDICTED NOISE LEVELSLA10 dBA

303540455055606570

CLIENT

NEALE PARK SEWER PUMPING STATIONUPGRADE OPTIONS - CONTRACT No. 3142

DATE

TITLE

REVISION DETAILSDATEREV APPROVED

CHECKED

APPROVED

PROJECTDRAWN DESIGNED

220423.001PROJECT No.

SCALE SIZE

DRAWING No. REV

A3Blenheim New Zealand

89 Seymour Street (PO Box 186)

Telephone: +64 3 520 6060

Email: [email protected]

NEW PUMPSTATION - CORDER PARKPREDICTED NOISE LEVELSEMERGENCY OPERATION APPENDIX C2 A

1:750

INFORMATIONNOT FOR CONSTRUCTIONLK HM

A ISSUED FOR INFORMATION

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SCALE 1:750

7.5 15 30m

PUMPROOM

WETWELL

GEN.ROOM

LEGEND:PREDICTED NOISE LEVELSLA10 dBA

303540455055606570

CLIENT

NEALE PARK SEWER PUMPING STATIONUPGRADE OPTIONS - CONTRACT No. 3142

DATE

TITLE

REVISION DETAILSDATEREV APPROVED

CHECKED

APPROVED

PROJECTDRAWN DESIGNED

220423.001PROJECT No.

SCALE SIZE

DRAWING No. REV

A3Blenheim New Zealand

89 Seymour Street (PO Box 186)

Telephone: +64 3 520 6060

Email: [email protected]

NEW PUMPSTATION - CORDER PARKPREDICTED NOISE LEVELS

NORMAL OPERATION APPENDIX C1 A

1:750

INFORMATIONNOT FOR CONSTRUCTIONLK HM

A ISSUED FOR INFORMATION

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Project 220423-108 | File Hm120614hm corder park environmental noise assessment V3.docx | Revision 1 Aurecon Page ii

Appendix D Noise monitoring results

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Corder Park Pump Station, Atawhai Drive, Atawhai

Tuesday 29/11/2011 Wednesday 30/11/2011

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