SAVILLS PLANNING & REGENERATION Tipner, Port

SAVILLS PLANNING & REGENERATION Tipner, Port Solent and Horsea Island Concept Statements Environmental Noise Assessment Report No. 01306\R02 SAVILLS PLANNING & REGENERATION

Tipner, Port Solent and Horsea Island Concept Statements

Environmental Noise Assessment

Report No. 01306\R02

May 2010

Dr Nigel Cogger BSc CEng FIOA Louise Conroy BEng MIOA Chris Heal MEng MIOA

The English Cogger LLP 5 Charlecote Mews Staple Gardens Winchester Hampshire SO23 8SR

Telephone +44 (0)1962 858800 Fax +44 (0)1962 858809 Web www.tecp.co.uk

Registered in England • Partnership No OC312466 • VAT Registration No 750 4706 43

The English Cogger LLP Savills Planning and Regeneration Report No. 01306\R02

CONTENTS

1 EXECUTIVE SUMMARY 1

1.1 Tipner Site 1

1.2 Port Solent & Horsea Island Site 1

2 INTRODUCTION 1

3 NOISE CRITERIA 1

3.1 Planning Guidance 1

3.2 British Standards and Other Guidance 2

4 ASSESSMENT METHODOLOGY 3

4.1 Theoretical Noise Modelling 4

4.2 Measured Noise Data 4

5 TIPNER SITE ASSESSMENT 5

5.1 Road Traffic Noise 5

5.2 Noise from Tipner Firing Range 5

5.3 Mitigation Strategy 6

6 PORT SOLENT AND HORSEA ISLAND SITE ASSESSMENT 7

6.1 Site Noise Levels 7

6.2 Mitigation Strategy 8

FIGURES

APPENDIX 1: Ambient Noise Survey Details

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1 EXECUTIVE SUMMARY

Portsmouth City Council and the South East England Development Agency is developing a concept statements supporting the Local Development Framework for the regeneration of two areas of land adjacent to the M275 and M27 motorways, near Portsmouth, Hampshire. The scheme is to include residential, commercial and leisure uses. The sites comprise areas of land to the west and east of the M275 at Tipner, and an area of land on the eastern side of Horsea Island, south of the M27 and west of the M275. The sites are affected primarily by road traffic noise from those motorways, but the Tipner site, situated to the north of the Ministry of Defence Tipner Range, is also affected by noise from firearms and clay target shooting.

1.1 Tipner Site

An environmental noise assessment of the Tipner site shows that road traffic noise from the M275 results in the area being in PPG 24 Noise Exposure Categories B and C. Noise levels from operation of the Tipner Firing Range affect the land to the west of the M275 and, to a lesser extent the land to the east. It has been concluded that mitigation of noise on the Tipner site would be appropriate if the site is to be used for residential development. Such mitigation would normally be designed to enable the noise level criteria specified in BS 8233 to be met. It is also necessary to mitigate noise from Tipner Firing Range. A mitigation scheme for residential development would include one or more of the following strategies:

• design of building layouts, including arranging massing of the buildings to provide screening for gardens, noise sensitive façades and other residential properties;

• orientation of buildings with sensitive rooms facing away from noise sources;

• use of noise barriers close to the noise source and;

• improvements to the sound insulation of the building envelope.

1.2 Port Solent & Horsea Island Site

The environmental noise of the Port Solent and Horsea Island site has confirmed that the site is generally in PPG 24 NEC B, as a result of traffic noise from the M27, to the north, and the M275, to the east, assuming downwind conditions (a north easterly wind). Mitigation of road traffic noise would be appropriate where the site is to be used for residential development and would include building layouts and orientation of noise sensitive façades favourable to noise reduction and, if required, improvements to the sound insulation of the building envelope.

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2 INTRODUCTION

The English Cogger LLP has been commissioned to undertake an acoustic assessment of the area, to inform the concept statements and master-planning for the development sites. This report provides the initial noise assessments undertaken for the concept statements, with a more detailed analysis of the environmental noise issues following in a later phase. Section 2 of this report provides a background to the environmental noise criteria relevant to planning, while section 3 outlines the methodology of the initial assessment. The Tipner site is discussed in Section 4 and the Horsea Island site in Section 5.

3 NOISE CRITERIA

3.1 Planning Guidance

Guidance on the noise implications of planning proposals is provided in the Planning Policy Guidance Note PPG 24, Planning and Noise , originally published by the Department of the Environment, but now within the remit of Communities and Local Government. This document gives guidance to local authorities on the use of planning powers to minimise the adverse impact of noise and outlines the parameters that should be considered when determining planning applications, either for noise sensitive developments, or for developments that will generate noise.

The overall principle is to ensure a balance between noise sensitive and noise generating developments and to consider the use of planning conditions and appropriate mitigation measures to control the source of, or limit the exposure to, noise. Various types of noise are considered in PPG 24, including transportation noise and noise from industrial or commercial developments and recreational activities.

Where sites for new residential development are affected by transportation noise, or noise from mixed sources (defined as any combination of road, rail, air and industrial noise sources, where no individual source is dominant), Noise Exposure Categories (NECs) and associated planning advice are provided to assist the in the determination of the suitability of the site.

The NECs for road sources and the associated planning advice are reproduced below, for reference:

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Noise levels 0 corresponding to the Noise Exposure Categories for new dwellings, LAeq, T dB

Noise source Noise Exposure Category

A B C D

Road traffic 07:00-23:00 < 55 55 – 63 63 – 72 > 72 23:00-07:00 1 < 45 45 – 57 57 – 66 > 66

0 Noise levels: the noise levels used when deciding the NEC of a site should be representative of typical conditions.

1 Night-time noise levels (23:00-07:00): sites where individual noise events regularly exceed 82 dB LAmax (S time weighting) several times in any one hour should be treated as being in NEC C regardless of the L Aeq, 8h (except where the L Aeq, 8h already puts the site in NEC D).

The interpretation of these NECs, in terms of the granting of planning permission, is shown below:

NEC Planning advice

A Noise should not be considered as a determining factor i n granting planning permission, although the noise level at the high end of the category should not be regarded as a desirable level.

B Noise should be taken into account when determining planning applications and, where appropriate, conditions imposed to ensure an adequate level of protection against noise.

C Planning permission should not normally be granted. Where it is considered that permission should be given, for example because there are no alternative quieter sites available, conditions should b e imposed to ensure a commensurate level of protection against noise.

D Planning permission should normally be refused.

3.2 British Standards and Other Guidance

3.2.1 BS 8233

The British Standard BS 8233: 1999, Sound insulation and noise reduction for buildings – Code of Practice provides criteria for noise levels in the built environment, those for residential development being based on the recommendations of the World Health Organisation. The criteria for steady state, “anonymous” noise levels in unoccupied spaces within residential properties, from sources such as road traffic, mechanical services and other continuously running plant, are tabulated below:

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Criterion Typical situation Design range, L Aeq dB

Good Reasonable

Reasonable conditions for Living rooms 30 40 sleeping and resting Bedrooms 30 35

For a reasonable standard in bedrooms at night, individual noise events (measured with the F time- weighting) should not normally exceed 45 dB L Amax

The Standard also states that:

In gardens and balconies etc, it is desirable that the steady noise level does not exceed 50 dB L Aeq,T and 55 dB L Aeq, T should be regarded as the upper limit .

Recommendations for mitigation to enable these targets to be achieved are provided in the Standard, including the use of bunds and barriers to reduce external noise and space planning and sound insulation for the control of internal noise levels.

3.2.2 Target Shooting Guidance

There is no specific planning guidance for sites affected by noise from firearms (small and full bore rifles), although Clay Target Shooting, Guidance on the Control of Noise , produced by the Building Research Establishment and published by the Chartered Institute of Environmental Health, January 2003, provides a methodology for the measurement and assessment of noise from clay target shooting, which is undertaken on the MOD firing range at Tipner on alternate Sunday mornings, in addition to the normal firearms training. In the absence of other guidance, this methodology can be considered the most appropriate available for assessing the impact of operation of the range on residential development nearby.

The guidance suggests that, whilst there is no fixed shooting noise level (SNL) at which annoyance starts to occur, annoyance is less likely to occur at a mean SNL below 55 dB(A), and highly likely to occur at a mean SNL above 65 dB(A). It is recognised that the likelihood of annoyance at levels within this range will depend upon local circumstances. The SNL is derived from the 25 highest shot levels from a continuous series of short-term measurements over a 30-minute period.

4 ASSESSMENT METHODOLOGY

Both proposed sites for redevelopment are predominantly affected by noise from traffic on the M275 and on the interchange of the M275 with the M27. The Horsea Island site would also be affected by noise from the M27. The Tipner site is also affected by noise from operation of the Tipner range.

Environmental noise models have been prepared for each site, as discussed below.

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4.1 Theoretical Noise Modelling

Noise propagation models using the IMMI environmental noise modelling software developed by Wölfel Meßsysteme-Software have been prepared for each site to assess the noise from the motorways. The computer models incorporate information on the road layouts, including the horizontal and vertical alignments, and representative traffic flows from Highways Agency data for 2008 for each road section. The model incorporates topographical information, including road sections on embankments and overbridges. Existing buildings and the motorway embankments, which would provide some noise screening to the sites, have been included in each model where appropriate.

Calculations of noise propagation from the road traffic sources have been carried out over the proposed development area for each site, using a grid of receiver locations, defined at 1.5 m above the local ground level, to establish noise contours. The reference height of 1.5 m is representative of the typical height for a ground floor window and used to determine define the PPG 24 noise exposure categories. The contours that are presented within each assessment section are referenced to the PPG 24 NEC boundaries for road traffic noise, as explained in Section 2.

The noise levels within the development area are highly dependant on wind direction, with the highest levels obtained when there is a positive wind vector from the dominant section of motorway. The computer model is based on the methodology in the International Standards Organisation standard ISO 9613, Acoustics - Attenuation of sound during propogation outdoors , which predicts noise levels under downwind conditions in all directions. In the case of the land at Port Solent and Horsea Island, a downwind condition cannot exist from both the M27 and the M275 at the same time and the model would, therefore, overpredict noise levels. A directivity factor for the noise sources at Port Solent and Horsea Island has therefore been introduced in order to provide realistic noise levels for a given wind direction.

The IMMI models have also been used to develop and assess conceptual mitigation strategies, including use of barriers and the massing of buildings to provide screening and the optimisation of building layouts to limit the noise exposure of noise sensitive facades and outdoor areas.

4.2 Measured Noise Data

Monitoring of ambient noise levels from road traffic at a series of locations across the study area was undertaken between 8 and 12 April 2010 to provide calibration and verification of the computer models. A logging sound level meter was installed at the Tipner range for the whole period to provide baseline data and short-term measurements were undertaken at a series of locations on the three weekdays. Wind conditions varied over the monitoring period from generally northerly to generally southerly, with speeds of approximately 2 m/s and some periods of calm. Weather conditions were dry. A period of shooting by an independent shooting club was recorded during the monitoring period, on the Sunday morning, and the noise levels from this have been used to provide an indication of the impact of the firing range on the development site.

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Full details of the instrumentation used, the weather conditions and the measured ambient noise data are provided in Appendix 1, while a summary graph, showing the time history and wind conditions is shown as Figure 2. The diurnal variation in traffic noise at the site is clearly shown, as is the period when shooting was taking place, between 10:00 am and noon on Sunday, 11 April.

5 TIPNER SITE ASSESSMENT

The Tipner site lies to the west and east of the M275, within Portsmouth Harbour. The site location and development boundaries are shown in Figure 1. The Tipner noise environment is dominated by road traffic on the M275, which is on a 10 m high embankment, with an overbridge at Tipner Lane. Existing development to the west of the M275 include Tipner Firing Range and Harbour School, which will remain, and to the east of the M275 there are disused MOD buildings, a disused greyhound racing track and an industrial estate.

5.1 Road Traffic Noise

The day and night PPG 24 noise exposure category boundaries are presented in Figure 3. Very little of the land falls within NEC D, where the planning advice is that planning permission should normally be refused. It should be noted that the NEC’s are defined at 1.5 m above ground and the land closest to the M275 is within the shadow of the embankment and therefore has a restricted view of the carriageway. Noise levels close to the M275 above ground floor level would, however, be higher. The majority of the site to the west of the M275 lies within Category C, for which the advice is that planning permission should not normally be granted, although where it is considered that permission should be given, for example because there are no alternative quieter sites available, conditions should be imposed to ensure a commensurate level of protection against noise. To the east of the M275, the land within approximately 300m from the edge of the motorway is in NEC C, with the remaining area in NEC B, for which the advice is that noise should be taken into account when determining planning applications and, where appropriate, conditions imposed to ensure an adequate level of protection against noise . A noise mitigation strategy for residential the development of site is, therefore, appropriate to enable the recommendations of PPG 24 to be met.

5.2 Noise from Tipner Firing Range

The MOD firing range lies to the west and south of the development site and is understood to be used daily, for varying durations between 0900 and 1500, depending upon the current demands from the MOD. The range is also used at weekends, although this is typically for shorter periods. Indicative noise levels from the range during civilian shooting are shown in Figure 4. It can be seen that maximum noise levels are likely to exceed 70 dB L Amax across the development site, with levels exceeding 90 dB L Amax close to the boundary of the site. The CIEH guidance on Clay Target Shooting indicates that typical maximum noise levels above 65 dB are highly likely to cause annoyance and a mitigation strategy for this noise source is, therefore, appropriate.

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5.3 Mitigation Strategy

The assessment and the NECs for road traffic show that mitigation of noise on the Tipner site would be appropriate if the site is to be used for residential development. Such mitigation would normally be designed to enable the noise level criteria specified in BS 8233 and reproduced at Section 2.2.1 of this report, to be met. It is also necessary to mitigate noise from Tipner Firing Range. A mitigation scheme for residential development can include one or more of the following strategies:

• design of building layouts, including arranging massing of the buildings to provide screening for gardens, noise sensitive façades and other residential properties;

• orientation of buildings with sensitive rooms facing away from noise sources;

• use of noise barriers close to the noise source and;

• improvements to the sound insulation of the building envelope.

5.3.1 Optimisation of building orientation and layout

Buildings with non-sensitive uses, such as commercial and leisure facilities can be located in the noisier areas of the site and used as screening blocks for noise-sensitive (residential) properties. Where noise-sensitive buildings are located in noisy areas, the façades facing the noise sources (the M275 motorway and Tipner Firing Range) can be used for non- sensitive internal uses, such as corridors, stairwells, bathrooms, etc. Figure 5 demonstrates the effect of the massing of residential buildings, modelled as three storeys high, to provide ‘quiet’ external amenity spaces and to reduce the exposure of noise sensitive façades. Figure 6 shows a similar effect for noise from the firing range. It should be noted that the locations of these barrier blocks are to demonstrate the effect of screening on the calculated noise contours and do not imply that the locations shown are to be used for development. It can also be seen from Figures 5 and 6 that the orientation of buildings to optimise mitigation of road traffic noise can be inconsistent with the control of noise from the Firing Range.

Where noise-sensitive rooms need to be located on the more exposed façades, improvements to the sound insulation of the building envelope, as described in section 4.3.3 below, can be incorporated to reduce internal noise levels to those recommended in BS 8233.

5.3.2 Barriers

The potential effectiveness of a roadside barrier is presented in Figure 7. The results are for a 2.5 metre high barrier close to the hard shoulder of the motorway from the Portsmouth Harbour overbridge to the end of the study area. The barrier extends the area of the site that falls within the NEC B planning boundary, but any significant further improvements would require an increase of barrier height to 3 m to at least 3.5 m.

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Because of the elevation of the motorway, the only effective position for any barrier is close to the motorway edge, which would necessitate it being positioned on Highways Agency land. There are also likely to be non-acoustic issues with the use of a noise barrier including the foundation and structural implications of siting the barrier on an embankment and on the Tipner Lane motorway over-bridge. The visual implications of a barrier, both from the motorway and from the development site, would also need to be addressed.

A conventional noise barrier, 2-3 m high and located at the boundary of Tipner Firing Range would only provide limited attenuation and is unlikely to reduce exposure in noise sensitive rooms above the ground floor level. More effective screening could be achieved with, for example, a three storey (or higher) commercial building or single aspect residential buildings.

5.3.3 Building envelope.

Improvements to the sound insulation of the building envelope are usually achieved by the use of sound insulating glazing, as this is the weakest element. However, as windows would need to be kept closed to meet the acoustic conditions, an alternative source of ventilation would then be required, incorporating acoustically insulated vents. The ventilation system would need to be compatible with the requirements of parts F and L of the Building Regulations as well as being designed to ensure that the desired internal noise levels are met. A whole-house ventilation system incorporating heat recovery can provide significant thermal benefits as well as mitigation of noise.

6 PORT SOLENT AND HORSEA ISLAND SITE ASSESSMENT

6.1 Site Noise Levels

This area of land lies to the southwest of the M27 and M275 interchange. Its noise environment is dominated by traffic on the M27, M275 and associated slip roads forming the interchange. Many of the slip roads in this area are on elevated structures as they pass over the M27. The M275 continues as an elevated road on an embankment to traverse the bridge over Portsmouth Harbour. The site layout and development boundaries are shown in Figure 1.

The PPG 24 NEC boundaries for this site, calculated from the IMMI model are presented in Figure 8 for a northeast wind direction, which is considered to be the worst case. Land within approximately 50 m of the M27 and within 30 m of the M275 falls within NEC D and land within approximately 350 m of the M27 and approximately 200 m of the M275 is in NEC C. The remainder of the land, including Horsea Lake and part of the area between the lake and Port Solent is within NEC B . It is worth noting that under the prevailing southwest wind direction, as shown in Figure 9, the area in NEC C is significantly reduced and an area in the west corner of the site is in NEC A.

Whilst the highest noise levels are in the north east corner, this is likely to be retained as open space, with residential and/or commercial development limited to the existing Port Solent development (immediately south west of the marina and including the existing car parks) and the northern strip of land currently occupied by the MOD buildings associated

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with HMS Excellent. The existing amenity space between Port Solent and HMS Excellent would also be retained. The noise sensitive development area is, therefore, within NEC B.

Noise levels from gunfire at Tipner Range would be expected to be approximately 55 dB LAeq and 80 dB L Amax at HMS Excellent and approximately 3 dB lower at the Port Solent site, assuming a clear line of sight. In practice, development of the land at Tipner would provide significant screening, reducing these levels by approximately 15 dB. Further localised reductions would be expected from the massing of the buildings on Horsea Island and, whilst use of the range could be audible, the risk of disturbance would be small.

6.2 Mitigation Strategy

The assessment and the NECs for road traffic show that mitigation of noise on the Port Solent and Horsea site would be appropriate if the site is to be used for residential development and a strategy similar to that described in section 4.1 above can be developed.

6.2.1 Optimisation of building layout

The use of site layout can be a method of achieving a level of mitigation to the site. Buildings can be orientated to provide ‘quiet’ external amenity spaces and to reduce the exposure of noise sensitive façades. Internal layouts would be arranged to ensure windows to noise sensitive rooms are located on the quiet façades and, where noise-sensitive rooms need to be located on the more exposed façades, improvements to the sound insulation of the building envelope, as described in section 4.3.3 above, can be incorporated.

6.2.2 Barriers

Roadside barriers are not a practicable solution for either the main motorways, or the interchange slip roads, noise from which provides a significant contribution to the overall noise levels in the development area.

6.2.3 Building envelope.

Improvements to the building envelope can be incorporated as discussed in section 4.3.3, to bring noise levels down to those recommended in BS 8233, where other strategies are not practicable.

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Tipner Lake Boatyard M275 motorway Harbour School

Greyhound track

Industrial Disused buildings Tipner Firing Range MOD site

Tipner development site Existing development

M27 motorway Existing development

Port Solent marina

Horsea Island M275 motorway

HMS Excellent

Port Solent & Horsea Island development site

FIGURE 1: Site location plans

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90 Lmax Gunfire Leq 80 L90

dB(A) 50

Thursday Friday Saturday Sunday Monday 8 April 2010 9 April 2010 10 April 2010 11 April 2010 12 April 2010 30 N N W Calm N Calm S Calm N Calm E S S N NE NE NNE 2 m/s 1-2 m/s 0-1 m/s 0-1 m/s 2-3 m/s 0-1 m/s 0-1 m/s 2 m/s 0-1 m/s 0-1 m/s 2-3 m/s 1-2 m/s 2-3 m/s 20

10:00 12:00 14:00 16:00 18:00 20:00 22:00 00:00 02:00 04:00 06:00 08:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 00:00 02:00 04:00 06:00 08:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 00:00 02:00 04:00 06:00 08:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 00:00 02:00 04:00 06:00 08:00 Time FIGURE 2: Ambient noise survey time history

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NEC D

NEC B NEC C

NEC B

NE C C

Daytime noise contours

NEC D NEC B

NEC C NEC C

NEC B

Night -time noise contours

FIGURE 3: Daytime and night-time PPG 24 NECs – Tipner site

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dB L Aeq

dB L Amax

FIGURE 4: Noise from MOD firing range – Tipner site

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NEC B NEC C NEC D NEC B

NEC B

NEC A

NEC C NEC A NEC B

Daytime noise conto urs

NEC B

NEC D NEC B

NEC B

NEC C

NEC B

Night-time noise contours

FIGURE 5: Effect of residential block configuration – Tipner site

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dB L Aeq

dB L Amax

FIGURE 6: Effect of 3-storey buildings on noise from MOD firing range – Tipner site

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NEC D NEC B

NEC C

NEC B NEC B

Daytime noise contours

NEC D

NEC C

NEC B NEC C

NEC B

Night -time noise contours

FIGURE 7: Effect of 2.5 m high roadside barrier – Tipner site

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NEC D

NEC C

NEC B

NEC A

Northeast wi nd direction

Daytime noise contours

NEC D

NEC B NEC C

Northeast wind direction

Night -time noise contours

FIGURE 8: PPG 24 NECs under worst case wind direction - Port Solent and Horsea Island site

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NEC C

NEC D

NEC B NEC A

Southwest wind direction

Daytime noise contours

NEC D

NEC C

NEC B

NEC A

Southwest wind direction

Night -time noise contours

FIGURE 9: PPG 24 NECs under best case wind direction - Port Solent and Horsea Island site

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APPENDIX 1 Ambient Noise Survey Details

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1 SURVEY CONDITIONS

An environmental noise assessment of the site was undertaken from Thursday, 8 April to Monday 12 April 2010. Weather conditions were dry during the survey period. Wind speeds were generally low, varying between 1-3 m/s, with some periods of calm. The wind direction was mainly northerly, becoming southerly for a time during the Friday and Saturday afternoons.

A logging sound level meter was installed at the Tipner firing range, to the north of the firing point, as shown in Figure A1.1, and was set to log ambient noise levels for continuous 5-minute averaging periods from 09:50 on 8 April to 09:00 on 12 April. Short term measurements were also recorded at a further five locations on the Tipner site and four locations on Horsea Island, during 8 April, with further measurements at three locations at Tipner and one at Horsea Island on 9 April and one at Horsea Island on 12 April. The short term measurement locations are also shown in Figure A1.1.

2 INSTRUMENTATION

Noise levels at the Tipner range monitoring location and at Horsea Island location H2 on 12 April only were measured using a Larson Davis type 824 Precision Sound Level Meter and Real Time Analyser (serial number 824A 1344), fitted with a Larson Davis type 2541 ½-inch free field microphone (serial number 4418) and Larson Davis type PRM 902 preamplifier (serial number 3544). The microphone was fitted with a windshield during the measurements. The sound level meter, microphone and preamplifier were last calibrated in a calibration laboratory on 7-9 June 2008. Calibration and conformance certificates are available.

Prior to and on completion of the survey, the sound level meter and microphone calibration was checked using a Larson Davis type CAL 200 Sound Level Meter Calibrator (serial number 2206). The Calibrator was last calibrated on 23 November 2009, in accordance with the requirements of ISO 10012 and a calibration and conformance certificate is available. No change in the calibration level occurred during the survey.

All other short term measurements at Tipner and Horsea Island were recorded using:

i) Rion sound level meter, type NL-32 (serial number 002406670), with a Rion type NX-22J Sound Monitor Card installed (serial number 00630553, version 2.1) and a Rion type UC-53A ½-inch free field microphone (serial number 305924) and a Rion type NH-21 pre-amplifier (serial number 10711) fitted. The microphone was fitted with a windshield during the measurements. The sound level meter, microphone and preamplifier were last calibrated in a calibration laboratory on 12-13 November 2008 and calibration and conformance certificates are available. Prior to and on completion of the survey, the sound level meter and microphone calibration was checked using a Rion type NC-74 Sound Level Meter Calibrator (serial number 00830811). The Calibrator was last calibrated on 15 November 2008, in accordance with the requirements of ISO 10012 and a calibration and conformance certificate is available. No change in the calibration level occurred during the survey.

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ii) Rion sound level meter, type NA-28 (serial number 00170246), with a Rion type UC-59 ½-inch free field microphone (serial number 00299) and a Rion type NH-23 pre-amplifier (serial number 60254) fitted. The microphone was fitted with a windshield during the measurements. The sound level meter, microphone and preamplifier were last calibrated in a calibration laboratory on 23 March 2009 and calibration and conformance certificates are available. Prior to and on completion of the survey, the sound level meter and microphone calibration was checked using a Rion type NC-74 Sound Level Meter Calibrator (serial number 34773049). The Calibrator was last calibrated on 22 March 2009, in accordance with the requirements of ISO 10012 and a calibration and conformance certificate is available. No change in the calibration level occurred during the survey.

At all measurement locations the microphone was supported on a tripod, at a height of 1.5 m above ground level.

3 MEASURED DATA

3.1 Tipner Range Monitoring Location

The time history of the continuous monitoring at Tipner range is shown at Figure A1.2, with an indication of wind conditions. Data are shown in terms of the energy average (L Aeq ), maximum level (L Amax ) and the background noise level (L A90 ) for each 5-minute measuring period (see Appendix 2 for an explanation of the acoustical terminology). The long term average levels used to determine the PPG 24 Noise Exposure Categories (NECs) are shown in the table below:

Date Time Noise level, NEC Comments dB L Aeq 8 April 2010 09:50-23:00 51.7 A Light N winds, backing W in evening. M275 road traffic dominant 8-9 April 2010 23:00-07:00 54.0 B Calm wind conditions 9 April 2010 07:00-23:00 56.4 B Winds calm in early morning/evening; light S for rest of day. M275 dominant 9-10 April 2010 23:00-07:00 55.2 B Calm wind conditions 10 April 2010 07:00-23:00 59.3 B Generally calm; light S wind during afternoon 10-11 April 2010 23:00-07:00 55.1 B Calm wind conditions 11 April 2010 07:00-23:00 61.4 B Light NE winds. M275 road traffic dominant except 10:00-12:00 when gunfire dominant (~74 dB L Aeq ); 61.4 dB L Aeq excludes gunfire 11-12 April 2010 23:00-07:00 55.6 B Light NNE winds 12 April 2010 07:00-09:00 62.3 B Light NNE winds; M275 dominant

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The short term measurements are shown in the following table, with the reference level measured at the same time at the Tipner range monitoring location:

Date Time Location Noise level, dB L Aeq Wind Location Monitor Direction Speed 8 April 2010 10:15-10:30 T1 62.8 52.7 N ~ 2 m/s 10:20-10:35 T3 64.8 53.0 N ~ 2 m/s 10:35-10:50 T3 64.5 51.7 N ~ 2 m/s 10:30-10:45 T2 60.0 53.0 N ~ 2 m/s 11:15-11:30 T4 62.3 54.5 N ~ 2 m/s 11:30-11:35 T4 62.8 53.0 N ~ 2 m/s 11:15-11:30 T5 62.1 54.5 N ~ 2 m/s 9 April 2010 13:40-13:55 T2 60.3 57.2 S 2-3 m/s 13:55-14:05 T3 63.2 54.2 S 2-3 m/s 14:15-14:25 T5 60.0 56.2 S 2-3 m/s

3.2 Horsea Site

It was not possible to arrange access to HMS Excellent to install monitoring equipment, but a series of short term measurements was recorded at four locations, representative of the areas to be used for noise sensitive development (HMS Excellent and Port Solent). The measurement locations are shown in Figure A1.1 and the measured levels in the table below.

Date Time Location Noise level, Wind dB L Aeq Direction Speed 8 April 2010 12:10-12:25 H1 51.8 N ~ 2 m/s 13:15-13:30 H3 50.8 N ~ 2 m/s 13:40-13:55 H4 60.0 N ~ 2 m/s 14:05-14:20 H2 53.6 N ~ 2 m/s 9 April 2010 12:35-13:50 H3 43.0 S 2-3 m/s 12 April 2010 09:20-19:35 H2 57.1 NNE 2-3 m/s

The measurement undertaken on 9 April clearly shows the influence of a southerly wind on traffic noise levels from the M27 and M275, while the measurement on 12 April indicates higher levels due to the worst case north easterly winds, which give rise to significant contributions from both the M275 and the M27.

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Tipner Lake M275 motorway

T1 T2 Monitoring location T3

T5 T4

Tipn er firing range

Short term measurement locations

Tipner development site

M27 motorway

Port Solent marina

H1 H2 H4

H3 M275 motorway Horsea Island

HMS Excellent Short term measurement locations

Port Solent & Horsea Island development site

FIGURE A1.1: Ambient noise measurement locations

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Lmax Gunfire 80 Leq

L90

dB(A) 50

Thursday Friday Saturday Sunday Monday

30 8 April 2010 9 April 2010 10 April 2010 11 April 2010 12 April 2010

N N W Calm N Calm S Calm N Calm E S S N NE NE NNE 2 m/s 1-2 m/s 0-1 m/s 0-1 m/s 2-3 m/s 0-1 m/s 0-1 m/s 2 m/s 0-1 m/s 0-1 m/s 2-3 m/s 1-2 m/s 2-3 m/s 20

FIGURE A1.2: Ambient noise survey time history