I WESTPORT E.I.S.

SECTION NINE

NOISE IMPACT ASSESSMENT

Appendix /I

Site Location Map showing Noise Monitoring Stations

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I WESTPORT E.I.S.

SECTION NINE

NOISE IMPACT ASSESSMENT

by: EOLAS The Irish Science and Technology Agency Environmental Services Glasnevin DUBLIN 9

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WESTPORT E.I.S.

SECTION NINE

9. NOISE IMPACT ASSESSMENT

9.1 Baseline Studv

9.1.1 Measurements of the pre-development noise levels were made at the locations in Table No. 4. The locations chosen were selected as being

representative of the closest residences to the proposed development.

9.1.2 Continuous 24 hour monitoring of noise levels for a period of one week was carried out at Rusheen Lodge and at Westport Quay, these locations being closest to the site of the main Treatment Works and Pumping Station proposed at Cleavlagh. Noise Monitoring Stations are shown on the Location Map in Appendix II of this Section of the Statement.

9.1.3 Sampled measurements of night time background noise levels were made at the sites for the six remote pumping stations.

9.2 Measurements

9.2.1 The measurement parameters used were the hourly values of A- weighted sound pressure levels as set out below.

( 1 L1 : The level equalled or exceeded for 1% of the measurement time.

(2) L10 : The level equalled or exceeded for 10% of the measurement time.

(3) L95 : The level equalled or exceeded for 95% of the measurement time.

(4) Leq : The equivalent continuous level.

The "fast" time weighting was used.

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WESTPORT E.I.S.

LOCATION

Rusheen Lodge

Westport Quay

Streamstown

Rossbeg No. 1

Rossbeg No. 2

Roman Island

Quay

Ballinrobe Road

TABLE NO. 4:

N P E OF MEASUREMENT

Continuous 24 hour for 7 days L1, LAO, L95, Leq (hourly)

L1, L10, L95, Leq (hourly)

Sampled Background (L95) night time

Sampled Background (L95) night time

Sampled Background (L95) night time

Sampled Background (L95) night time

Sampled Background (L95) night time

Sampled Background (L95) night time

COMMENT

240 metres from nearest plant on proposed main Treatment Works Site

530 metres from nearest plant on proposed main Treatment Works Site

90 metres from proposed Remote Pumphouse

32 metres from proposed Remote Pumphouse

36 metres from proposed Remote Pumphouse

210 metres from proposed Remote Pumphouse

10 metres from proposed Remote Pumphouse

44 metres from proposed Remote Pumphouse

Summary of Fieldwork carried out as part of this Noise Impact Statement

Note: All Remote Pumphouses will be constructed so as to afford the

necessary sound insulation to meet night time criteria.

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1 WESTPORT E.I.S.

9.3 Ln Values

9.3.1 The L l values indicate the maximum values occurring during the measurement periods.

The LIO is widely used for road traffic noise studies.

The L95 values indicate the background noise levels or minimum noise

levels occurring during the measurement periods.

The Leq is an energy based average widely used in assessment of environmental impact.

9.4 Instrumentation

9.4.1 The measurements were made using a CEL model 262 Environmental Noise Analyser.

9.4.2 The measurement system was calibrated using a Sound Level Calibrator Bruel & Kjaer Type 4230.

9.4.3 The microphone height used for the measurements was 1.5 metres

above ground.

9.5 Measurement Results

I

9.5.1 The results of the Baseline Measurements are given in short-form in Table No. 5. Given that the proposed plant can operate at any time over a 24 hour period the night time values of L95 are given as being

the significant parameters for the existing noise environment at Westport.

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WESTPORT E.I.S.

Rusheen Lodge

Westport Quay

LOCATION

Streamstown Pumping Station

Rossbeg Pumping Station No. 1

Rossbeg Pumping Station No. 2

Existing Quay Pumping Station

Roman Island Pumping Station

BACKGROUND NOISE LEVEL

L95

Nightime spot sample Nightime spot sample Nightime spot sample Nightime spot sample Nightime spot

REMARKS

31 dB(A)

36 dB(A)

TABLE NO. 5: Backaround Noise Results

Nightime Mean

Nightime Mean

9.5.2 The data for Rusheen Lodge and Westport Quay is shown plotted in Appendix 2 to this Section of the Statement. Wind data was obtained from the Meteorological Service at Belmullet as an indication of

prevailing weather conditions over the measurement periods.

9.6 Noise Criteria

9.6.1 In general, noise criteria for industrial noise in European countries are related to zones such as residential, industrial, commercial, etc. "Acceptable levels" in various countries can vary from 35 to 60 dB(A)

at night and 40 to 70 dB(A) during the day, depending on the type of area. The lower levels of 35 (night time) are normally applicable to rural areas, zones of hospitals etc.

9.6.2 EOLAS experience and precedents set in planning conditions in Ireland by various local authorities and An Bord Pleanala have shown that, for general acceptability, noise level criteria outside nearby residences should normally be selected within the following ranges:

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WESTPORT E.I.S.

Night : 35 to 40 dB(A)

Day : 45 to 55 dB(A)

9.6.3 An important aspect of these criteria is the absence of prominent discrete tones or impulses.

9.6.4 Selection of the preferred noise criteria values within the range of values above depends on the pre-existing noise levels, the character

of the area and the nature of the development.

9.6.5 Taking the above into account and the low level of background noise at Westport we propose the following criteria as being appropriate for

minimal impact on the existing noise environment:

Night : 35 dB LAeq (hourly)

Day : 50 dB LA,^ (hourly)

These are limit values for the noise from the proposed plant measured outside any permanent dwelling. There should not be any significant pure tones or impulsive elements in the noise spectrum.

9.7 Potential Noise Sources of Pro~osed Develo~rnent

9.7.1 The principle plant items associated with the main treatment works proposed at Cleavlagh together with the electrical power ratings and

distances to nearest residences are given in Table No. 6.

9.7.2 Table No. 7 gives the locations and distance from residences for the Remote Pumping Stations. These Stations will be housed in purpose

built acoustically insulated structures.

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WESTPORT E.I.S.

TREATMENT

WORKS

Aerators Preliminary Units: Screezer Grit Trap Primary Sedimentation Final Clarifiers Sludge Pumps Sludge Thickener

QUANTITY INSTALLED

POWER

I 5 kW

4 kW 0.55 kW

2.5 kW 2.5 kW 12 kW

2 kW

Not Housed Not Housed

DESCRIPTION

Not Housed

Not Housed Not Housed

Housed

DISTANCE FROM

NEAREST RESIDENCE

340m

- -

- -

=

000000 TABLE NO. 7:

Housed

REMOTE PUMPING

STATIONS

Streamstown

295m

Rossbeg No. 1

Rossbeg No. 2

Roman Island

Quay

Ballinrobe No. 2

QUANTITY

I Duty, 1 Standby

1 Duty, 1 Standby I Duty, 1 Standby 1 Duty, 1

Standby 3 Duty, 2 Standby 1 Duty, I Standby

TABLE NO. 6: Principal Noise Sources on the Treatment Works Site and Proximity to Rusheen Lodge

INSTALLED

POWER

2kW

5kW

1 KW

3 kW

3 kW

3 kW

Housed I 36m

DESCRIPTION DISTANCE FROM

NEAREST RESIDENCE

Housed I 44m

Housed Housed

Housed 210m

Remote Pumping Station Plant and Proximity to Permanent Housing

Housed 44m

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WESTPORT E.I.S.

9.8 Comparison with Exisfina Treatment Plants

In an effort to establish comparisons between the proposed works and

existing Plant sited elsewhere in Mayo, noise samples were measured

at various locations in Mayo The results of these measurements are

shown in Table No. 8 below.

LOCA JION

Castlebar

Castlebar

Achill Island

Achill Island

Achill Island

Dooagh

Dooagh

PLANT

Aerators (4)

30 Hp each

Sludge Press

Aerators (2)

30 Hp each

Preliminary Units

Sludge Press

Remote Pumping

Station No. 1

Remote Pumping

Station No. 2

NOISE LEVEL

W A ) 46 dB(A)

43 dB(A)

40 dB(A)

41 dB(A)

41 dB(A)

40 dB(A)

35 dB(A)

DlS JANCE

120 metres

30 metres

120 metres

60 metres

30 metres

15 metres

7 metres

TABLE NO. 8: Results of Measurements made of similar Plant to that Proposed at Westport

COMMENT

Nind

=avowing

'ropagation

ioused

4coustic

Weakness at

Door-area of

Building

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WESTPORT E.I.S.

9.9 Control of Noise Emissions from Pro.posed Develo.pment

9.9.1 The proposed development is readily amenable to reliable noise control measures using established and proven techniques. The measures listed below will be used to ensure compliance with the environmental noise criterion given in 9.6.5 of this Report.

Treatment Works

Selection of low noise level equipment and plant

The use of silencers and attenuators on individual plant items and

equipment.

The use of local natural screening and provision of purpose built acoustic enclosures.

The orientation of plant locations and building layout on the site.

The provision of earth banks where necessary to provide screening of

noise sources.

The optimisation of plant location with regard to attenuation provided by distance and terrain losses.

Remote Pump Houses

Selection of low noise equipment and plant

Construction of purpose designed sound proofed pump houses

Impact of Proposed Development

9.10. I Treatment Works

Estimates of the expected noise levels at the nearest residences show that the combined effects of distance and noise control measures listed in 9.9.1 of this Report will enable the development to meet the

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WESTPORT E.I.S.

environmental noise criterion of 35 dB(A) night time and 50 dB(A)

daytime.

9.10.2 Remote Pumping Stations

The Remote Pumping Stations will be constructed so as to provide the

necessary sound insulation to meet the 35 dB(A) night time and 50

dB(A) daytime criterion.

9.11 Construction Noise Levels

9.11.1 For a limited period during construction, noise levels may exceed the

criteria given. As construction works is of a temporary nature the

resulting noise levels are usually acceptable. Best practise will be

followed with regard to construction noise control techniques and

procedures.

9.12 Post Commissionina Environmental Noise Assessment

9.12.1 The developer will have an environmental noise assessment

conducted when the plant has been commissioned so as to verify

compliance with noise criteria.

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1 WESTPORT E.I.S.

SECTION NINE

NOISE IMPACT ASSESSMENT

Appendix I

Data from Continuous Monitoring of Noise Levels at Rusheen Lodue and Westport Quay

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EPA Export 25-07-2013:23:44:24

ENTRY DAY 1 1 2 1 3 1 4 1

5 1 6 1 7 1 8 1

OUTPUT FROM STATISTICAL ANALYSER ................................ RUSHEEN LODGE 24-30 JULY

TIME 1.00 2.00

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OUTPUT FROM STATISTICAL ANALYSER ................................

ENTRY 53 5 4 55

j 56 5 7 5 8 59 6 0 61 62 6 3

' 64 65 66 67 6 8 69 7 0 ' 71 72 7 3 74 75 76 7 7 78 79 8 0 81 82 8 3 84

1 85 86 87 8 8 8 9 9 0 9 1

i 92 9 3 9 4 9 5 9 6 97 98

1 99 100 101 102 103 -

DAY 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5 5

RUSHEEN LODGE

TIME 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00 22.00 23.00 24.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00' i7.00 18.00

- 19.00 20.00 21.00 22.00 23.00 24.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00

24-30 JULY

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OUTPUT FROM STATISTICAL ANALYSER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ENTRY DAY 104 5 105 5 106 5 ,107 5 108 5 109 5 110 5 111 5 112 5 113 5

I 114 5 11 5 5 116 5 117 5 118 5

. 119 5 120 5 121 6 ' 122 6 123 6 124 6 125 6 126 6 127 6 128 6 ' 129 6 130 6 131 6

, 132 6 133 6 134 6 135 6 1 3 6 6 137 6 138 6

, 139 6 140 6 141 6 142 6 1143 6 144 6 145 7 146 7 147 7 148 7 149 7

I 150 7 151 7 152 7 153 7 154 7

RUSHEEN LODGE 24-30 JULY

TIME 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00 22.00 23.00 24.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00 22.00 23.00 24.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00

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EPA Export 25-07-2013:23:44:24

1

ENTRY 155 156 157 158 '159 160 161 162 163 164 165 '166 167 168

I

-,01

L10

L95

1Q

DAY 7 7 7 7 7 7 7 7 7 7 7 7 7 7

OUTPUT FROM STATISTICAL ANALYSER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RUSHEEN LODGE 24-30 JULY

NIGHT TIME DAY TIME NIGHT TIME DAY TIME NIGHT TIME DAY TIME NIGHT TIME DAY TIME

TIME 11.00 12.00 13.00 14.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00 22.00 23.00 24.00

MEAN 46.93 SO. 01 40.88 43.59 31.18

L9 5 28.00 30.00 31.00 31.00 33.00 31.00 28.00 27.00 27.00 25.00 25.00 25.00 26.00 26.00

STD. DEV. 8.56 6.13 8.92 7.19 7.25 6.76 8.44 6.21

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EPA Export 25-07-2013:23:44:24

ENTRY 1 2 3

DAY 1

OUTPUT FROM STATISTICAL ANALYSER . . ............................... WESTPORT QUAY 1-7 AUGUST 1992

TIME 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00 22.00 23.00 24.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00 22.00 23.00 24.00 1.00 2.00 3.00

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,

ENTRY 5 2 5 3 5 4 55

I 56 57 5 8 59 60 6 1 62 ' 63 6 4 65 6 6 67 68 69 70 7 1 7 2 73 7 4 7 5 76

I 77 78 79 80 8 1 8 2 83

I 84 85 86 87 88 89 9 0

I 9 1 9 2 9 3 9 4 9 5 96 97

, 98 99

100 1 0 1 1 0 2

DAY 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5

OUTPUT FROM STATISTICAL ANALYSER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . WESTPORT QUAY 1-7 AUGUST 1992

TINE 4.00 5.00 6.00 7.00 8.00 9.00

,10.00 11 .00 12.00 13.00 14.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00 22.00 23.00 24.00

1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00

10.00 11 .00 12.00 13.00 14.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00 22.00 23.00 24.00

1.00 2.00 3.00 4.00 5.00 6.00

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,

ENTRY 103 104 105 106 '107 108 109 110 111 112 113

'1114 115 116 117 118 119 120 1121 122 123 124 125 126 127 ,128 129 130 131 132 133 134 ,135 136 137 138 139 140 141: 142 ,143 144 145 146 147 148 149

' 150 151 152 153

6 -

DAY 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 7 7 7 7 7 7 7 7 7

OUTPUT FROM STATISTICAL ANALYSER ................................ WESTPORT QUAY 1-7 AUGUST 1992

TIME 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00

C, 17.00 18-00 19.00 20.00 21.00 22.00 23.00 24.00 1.00 2.00 3.00

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OUTPUT FROM STATISTICAL ANALYSER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . j WESTPORT QUAY 1-7 AUGUST 1992

ENTRY 154 155 156 157 1158 159

DAY 7 7 7 7 7

TIME 10.00 11.00 12.00 13.00

LO1 NIGHT TIME (00.00 - 08.00) DAY TIME (08.00 - 24.00)

L10 NIGHT TIME (00.00 - 08.00) DAY TIME (08.00 - 24.00)

MEAN STD. DEV.

~ 9 5 NIGHT TIME io0.00 - 08.00) 36.36 5.74 DAY TIME (08.00 - 24.00) 44.93 5.06

LAQ NIGHT TIME (00.00 - 08.00) 47.43 4.32 DAY TIME (08.00 - 24.00) 55.92 3.05

LEQ 57.00 56.00 58.00 56.00 55.00 56.00 59.00 62.00 60.00 55.00 54.00 54.00 54.00 SO. 00 48.00

NO. VALUES 56.

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