| Appendix 4.11 | |||||||
| Predicted Noise Levels from Sewer Construction (With the Use of Quiet Equipment ) | |||||||
| 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 | 106.0 | 111.6 | 103.8 | 108.0 | 105.4 | ||
| CMV1 | 3 | 91.5 | 97.1 | 89.3 | 93.5 | 90.9 | |
| CMV2 | 4 | 89.0 | 94.6 | 86.8 | 91.0 | 88.4 | |
| CMV3 | 10 | 81.0 | 86.6 | 78.8 | 83.0 | 80.4 | |
| CMV4 | 12 | 79.4 | 85.0 | 77.2 | 81.4 | 78.8 | |
| CMV5 | 6 | 85.4 | 91.0 | 83.2 | 87.4 | 84.8 | |
| CMV6 | 6 | 85.4 | 91.0 | 83.2 | 87.4 | 84.8 | |
| THT | 6 | 85.4 | 91.0 | 83.2 | 87.4 | 84.8 | |
| SKW1 | 4 | 89.0 | 94.6 | 86.8 | 91.0 | 88.4 | |
| SKW2 | 4 | 89.0 | 94.6 | 86.8 | 91.0 | 88.4 | |
| SKW3 | 3 | 91.5 | 97.1 | 89.3 | 93.5 | 90.9 | |
| SKW4 | 3 | 91.5 | 97.1 | 89.3 | 93.5 | 90.9 | |
| SKW5 | 20 | 75.0 | 80.6 | 72.8 | 77.0 | 74.4 | |
| SKW6* | 12 | 69.4 | 75.0 | 67.2 | 71.4 | 68.8 | |
| SKW7* | 12 | 69.4 | 75.0 | 67.2 | 71.4 | 68.8 | |
| SKW8* | 12 | 69.4 | 75.0 | 67.2 | 71.4 | 68.8 | |
| SKW9* | 12 | 69.4 | 75.0 | 67.2 | 71.4 | 68.8 | |
| SKW10 | 2 | 95.0 | 100.6 | 92.8 | 97.0 | 94.4 | |
| SKW11 | 6 | 85.4 | 91.0 | 83.2 | 87.4 | 84.8 | |
| SKW12 | 3 | 91.5 | 97.1 | 89.3 | 93.5 | 90.9 | |
| TSW1 | 6 | 85.4 | 91.0 | 83.2 | 87.4 | 84.8 | |
| TSW2 | 10 | 81.0 | 86.6 | 78.8 | 83.0 | 80.4 | |
| TSW3 | 6 | 85.4 | 91.0 | 83.2 | 87.4 | 84.8 | |
| TSW4 | 4 | 89.0 | 94.6 | 86.8 | 91.0 | 88.4 | |
| 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 | |||||||