| Appendix 4.3 |
| Assumed Powered Mechanical Equipment for Submarine Outfall
Construction (Unmitigated) |
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| Erection of Steel Working
Platflorm |
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| Powered Mechanical Equipment |
Reference |
No. Items |
SWL/Item |
On-time |
Sub-total |
Total SWL |
Total SWL |
| (PME) |
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dB(A) |
% |
SWL dB(A) |
dB(A) |
dB(A) |
| Stage 1:
Setting up Steel Working Platform |
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| Air
Compressor |
CNP 003 |
1 |
104 |
100% |
104 |
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| Percussion Drill rig, equiped with down the hole hammer |
CNP 164 |
1 |
115 |
100% |
115 |
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| Generator |
CNP101 |
1 |
108 |
100% |
108 |
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| Crane |
CNP 048 |
1 |
112 |
100% |
112 |
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| Barge |
CNP 016 |
1 |
104 |
100% |
104 |
117.7 |
117.69 |
| Stage 2: Grouting |
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| Generator |
CNP101 |
1 |
108 |
100% |
108 |
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| Grout Pump |
CNP 106 |
1 |
105 |
100% |
105 |
109.8 |
109.76 |
| Stage
3: Installation of Steel Casing in Rock |
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| Air Compressor |
CNP 003 |
1 |
104 |
100% |
104 |
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| Percussion Drill rig, equiped with ODEX |
CNP 164 |
1 |
115 |
100% |
115 |
115.3 |
115.33 |
| Note: Stages 1, 2 and 3 would not be conducted
concurrently |
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| Erection of Scaffold |
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| Powered Mechanical Equipment |
Reference |
No. Items |
SWL/Item |
On-time |
Sub-total |
Total SWL |
Total SWL |
| (PME) |
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dB(A) |
% |
SWL dB(A) |
dB(A) |
dB(A) |
| Generator |
CNP101 |
1 |
108 |
100% |
108 |
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| Vibrating Hammer |
CNP 172 |
1 |
115 |
100% |
115 |
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| Barge |
CNP 016 |
1 |
104 |
100% |
104 |
6 |
116.07 |
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| Drilling and Installation of
HDPE Pipeline |
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| Powered Mechanical Equipment |
Reference |
No. Items |
SWL/Item |
On-time |
Sub-total |
Total SWL |
Total SWL |
| (PME) |
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dB(A) |
% |
SWL dB(A) |
dB(A) |
dB(A) |
| Horizontal Drilling System1 |
CNP 101 |
1 |
108 |
100% |
108 |
111.6 |
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| Direct-drive
mixing system1 |
CNP 101 |
1 |
108 |
100% |
108 |
| Reclaimer2 |
CNP 282 |
1 |
103 |
100% |
103 |
| Note: |
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| 1 Based on diesel
generator |
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| 2 Based on water pump |
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| BS BS5228 (1997) Part 1 Noise and Vibration
Control on Construction and open sites |
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