Appendix 4.6
Predicted Noise Levels from   Sewer Construction (Unmitigated)
Sensitive receiver Distance from Construction Activities,        m Breaking up pavement, dB(A) Excavation of trench, dB(A) Installation of pipes and bedding, dB(A) Backfilling, dB(A) Reinstating road surface, dB(A)
SWL 114.5 112.5 103.8 108.0 116.5
SWL 114.53 112.45 103.77 108.01 116.50
CMV1 3 100.0 98.0 89.3 93.5 102.0
CMV2 4 97.5 95.5 86.8 91.0 99.5
CMV3 10 89.5 87.5 78.8 83.0 91.5
CMV4 12 87.9 85.9 77.2 81.4 89.9
CMV5 6 93.9 91.9 83.2 87.4 95.9
CMV6 6 93.9 91.9 83.2 87.4 95.9
THT 6 93.9 91.9 83.2 87.4 95.9
SKW1 4 97.5 95.5 86.8 91.0 99.5
SKW2 4 97.5 95.5 86.8 91.0 99.5
SKW3 3 100.0 98.0 89.3 93.5 102.0
SKW4 3 100.0 98.0 89.3 93.5 102.0
SKW5 20 83.5 81.5 72.8 77.0 85.5
SKW6* 12 77.9 75.9 67.2 71.4 79.9
SKW7* 12 77.9 75.9 67.2 71.4 79.9
SKW8* 12 77.9 75.9 67.2 71.4 79.9
SKW9* 12 77.9 75.9 67.2 71.4 79.9
SKW10 2 103.5 101.5 92.8 97.0 105.5
SKW11 6 93.9 91.9 83.2 87.4 95.9
SKW12 3 100.0 98.0 89.3 93.5 102.0
TSW1 6 93.9 91.9 83.2 87.4 95.9
TSW2 10 89.5 87.5 78.8 83.0 91.5
TSW3 6 93.9 91.9 83.2 87.4 95.9
TSW4 4 97.5 95.5 86.8 91.0 99.5
MTW1 190 63.9 61.9 53.2 57.4 65.9
MTW2 240 61.9 59.9 51.2 55.4 63.9
Note: 3 dB(A) facade effect was added in the calculation
*  Assumed 10dB(A) noise attenuation for NSR which would be totally screened from construction activity
Boldface indicate an exceedance of the noise criteria of 75dB(A) for residential uses and 70 dB(A) for temple and library