Appendix 4.2
Appendix 4.2a Powered Mechanical Equipment (PME) for the Different Construction Tasks during Normal Daytime Working Hours (Maintenance Dredging)
1.0 Maintenance Dredging at 2nd Berth
| Powered Mechanical Equipment (PME) | TM Ref./ other Ref. | Scen 1 No. Items | SWL/Item dB(A) | On-time % | Total SWL dB(A) |
|---|---|---|---|---|---|
| Grab Dredgers | CNP063 | 1 | 112 | 100.0% | 112 |
| Derrick Lighters | CNP061 | 1 | 104 | 100.0% | 104 |
| Tug Boats | CNP221 | 1 | 110 | 100.0% | 110 |
Total 115
Note: Scen 1 -Concreting Scen 2 -Others
Appendix 4.2b Calculation of Construction Noise Levels at Representative Noise Sensitive Receivers During Normal Daytime Working Hours (Maintenance Dredging)
| NSR | Activity | Distance (m) | Distance Corr., dB(A) | Total SWL, dB(A) | Corrected Noise Level, dB(A) | |
|---|---|---|---|---|---|---|
| N1 | Maintenance Dredging at 2nd Berth | 303.7 | 57.6 | 115 | 60 | |
| N2 | Maintenance Dredging at 2nd Berth | 354.1 | 59.0 | 115 | 59 |