Rookery RRF

Noise Control Design & Impact AssessmentAdditional Information

Colin English BSc CEng FIOA MIMechE

and environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGERand environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGER

Additional Information Requested

Information requested at CLP meeting: Maximum Noise Levels for Vehicle Movements Vehicle Movements on Existing A421

Information requested after CLP meeting: Use of LAmax and LAeq noise indices

Effects of Frequency of Noise on Audibility

and environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGERand environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGER

Noise Indices• Noise can be measured using many different

indices• In UK the following are commonly used:

LA90 – background noise

LAeq – activity noise (except for road traffic)

LA10 – road traffic

LAmax – activity noise

LA01 – activity noise

• Most other countries use LAeq for all noise and UK is following this approach

and environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGERand environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGER

Noise Indices

and environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGERand environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGER

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Noise Indices

and environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGERand environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGER

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Noise Indices

and environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGERand environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGER

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Noise Indices

and environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGERand environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGER

LA90

LAeq

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LAeq

LAmax

Daytime Vehicles on Access Road

Location Existing Ambient LAeq (dB)

Predicted Vehicle Noise Level (LAeq)

Existing LAeq + Vehicle Noise Level (LAeq)

Predicted Increase in Ambient LAeq

Pillinge Farm Cottages

50.0 23.6 50.0 0.0

South Pillinge Farm

48.0 26.9 48.0 0.0

Marston Moretaine

50.0 23.4 50.0 0.0

Stewartby Way 53.0 37.8 53.1 0.1

How End 53.0 18.1 53.0 0.0

Forest Centre 49.0 40.0 49.6 0.6

and environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGERand environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGER

Vehicles on Access Road: 5 – 6 am

Location Existing Ambient LAeq (dB)

Predicted Vehicle Noise Level (LAeq)

Existing LAeq + Vehicle Noise Level (LAeq)

Predicted Increase in Ambient LAeq

Pillinge Farm Cottages

50.0* 20.9 50.0 0.0

South Pillinge Farm

42.0 21.6 42.0 0.0

Marston Moretaine

49.0 18.4 49.0 0.0

Stewartby Way 42.0 31.0 42.3 0.3

How End 52.0 13.8 52.0 0.0

and environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGERand environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGER

Maximum Vehicle Noise Levels

Location Measured LAeq

(dB)

Predicted LAeq(dB)

6- 7 am

Measured LAmax, f (dB)

5-6 am

Measured LAmax, f (dB)

6- 7 am

Predicted LAmax (dB)

Pillinge Farm Cottages

50.0 24.1 66.4 68.5 32.9

South Pillinge Farm

24.1 27.4 66.4 67.1 36.5

Marston Moretaine

66.4 24.0 61.1 66.9  24.2

Stewartby Way

68.5 38.3 66.1 57.3 48.0

How End 32.9 18.6 57.0 76.1  21.3

and environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGERand environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGER

Traffic on Existing A421(South of Green Lane)

Condition Light Vehicles

HGV Noise Level at 10 m (dB LA10)

Pre Bypass 25585 2421 77.8

Bypass open 7708 386 67.9

Bypass + RRF (nominal)

7750 652 68.7

Bypass + RRF (maximum)

7858 979 69.6

and environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGERand environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGER

Audibility and Frequency

Audibility of sound depends on many factors:Level relative to ambient sound levelCharacter compared with character of ambient

soundFrequency of each noise (presence of tones)Fluctuating or steadyContinuous or intermittent

and environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGERand environmental noisep a r t n e r s h i pconsultants in acousticsTHE ENGLISH COGGER

Audibility and FrequencyPillinge Farm Cottages 22nd - 23rd June 2009

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12.5 20

31.5 50 80 12

520

031

550

080

012

5020

0031

5050

0080

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Frequency (Hz)

LA

eq

(d

B)

22/06/2009 23:30

23/06/2009 02:30

23/06/2009 06:30

Audibility and FrequencyStewartby Way 22nd - 23rd June 2009

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12.5 20

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031

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080

012

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0031

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0080

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Frequency (Hz)

LA

eq

(d

B)

22/06/2009 23:00

23/06/2009 02:00

23/06/2009 06:00

Audibility and FrequencyPillinge Farm Cottages - Predicted Spectra at First Floor level

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Frequency (Hz)

LZ

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Plant Noise Delivery Noise

Audibility and FrequencyStewartby Way - Predicted Spectra at First Floor Level

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Frequency (Hz)

LZ

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Plant Noise Delivery Noise