1. Rookery RRF Noise Control Design & Impact Assessment Additional Information Colin English BSc CEng FIOA MIMechE

2. 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 L Amax and L Aeq noise indices  Effects of Frequency of Noise on Audibility

3. Noise Indices Noise can be measured using many different indices In UK the following are commonly used:  L A90 – background noise  L Aeq – activity noise (except for road traffic)  L A10 – road traffic  L Amax – activity noise  L A01 – activity noise Most other countries use L Aeq for all noise and UK is following this approach

4. Noise Indices

5. L A90

6. Noise Indices L A90 L Aeq

7. Noise Indices L A90 L Aeq L A90 L Aeq L Amax

8. Daytime Vehicles on Access Road LocationExisting Ambient L Aeq (dB) Predicted Vehicle Noise Level (L Aeq ) Existing L Aeq + Vehicle Noise Level (L Aeq ) Predicted Increase in Ambient L Aeq Pillinge Farm Cottages 50.023.650.00.0 South Pillinge Farm 48.026.948.00.0 Marston Moretaine 50.023.450.00.0 Stewartby Way53.037.853.10.1 How End53.018.153.00.0 Forest Centre49.040.049.60.6

9. Vehicles on Access Road: 5 – 6 am LocationExisting Ambient L Aeq (dB) Predicted Vehicle Noise Level (L Aeq ) Existing L Aeq + Vehicle Noise Level (L Aeq ) Predicted Increase in Ambient L Aeq Pillinge Farm Cottages 50.0*20.950.00.0 South Pillinge Farm 42.021.642.00.0 Marston Moretaine 49.018.449.00.0 Stewartby Way42.031.042.30.3 How End52.013.852.00.0

10. Maximum Vehicle Noise Levels LocationMeasured L Aeq (dB) Predicted L Aeq (dB) 6- 7 am Measured L Amax, f (dB) 5-6 am Measured L Amax, f (dB) 6- 7 am Predicted L Amax (dB) Pillinge Farm Cottages 50.024.166.468.532.9 South Pillinge Farm 24.127.466.467.136.5 Marston Moretaine 66.424.061.166.9 24.2 Stewartby Way68.538.366.157.348.0 How End32.918.657.076.1 21.3

11. Traffic on Existing A421 (South of Green Lane) ConditionLight Vehicles HGVNoise Level at 10 m (dB L A10 ) Pre Bypass25585242177.8 Bypass open770838667.9 Bypass + RRF (nominal) 775065268.7 Bypass + RRF (maximum) 785897969.6

12. Audibility and Frequency  Audibility of sound depends on many factors:  Level relative to ambient sound level  Character compared with character of ambient sound  Frequency of each noise (presence of tones)  Fluctuating or steady  Continuous or intermittent

13. Audibility and Frequency