Appendix 4.2
Construction Noise Impact Assessment |
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(A1) Proposed Powered Mechanical Equipment for
Various Construction Tasks - Unmitigated Scenario |
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(I) Raw Water Mains Construction |
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Activity A
- Excavation of Trench / Breaking up Pavement |
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Powered Mechanical Equipment |
TM Ref./ |
No. of Items |
SWL/Item |
On-time |
Barrier |
Total SWL |
(PME) |
other Ref. |
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dB(A) |
% |
dB(A) |
dB(A) |
Excavator (mini) |
BS C.3, item 108 |
1 |
97 |
100% |
0 |
97 |
Breaker, mini-robot mounted |
CNP 031 |
1 |
115 |
100% |
0 |
115 |
Air Compressor |
CNP 002 |
1 |
102 |
100% |
0 |
102 |
Lorry
|
CNP 141 |
1 |
112 |
50% |
0 |
109 |
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Total |
116 |
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Activity
B - Installation of Pipes and Bedding |
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Powered Mechanical Equipment |
TM Ref./ |
No. of Items |
SWL/Item |
On-time |
Barrier |
Total SWL |
(PME) |
other Ref. |
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dB(A) |
% |
dB(A) |
dB(A) |
Mobile crane (mini) |
BS C.7, item 118 |
2 |
99 |
100% |
0 |
102 |
Lorry (mini) |
CNP 141 |
1 |
112 |
50% |
0 |
109 |
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Total |
110 |
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Activity C - Backfilling |
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Powered Mechanical Equipment |
TM Ref./ |
No. of Items |
SWL/Item |
On-time |
Barrier |
Total SWL |
(PME) |
other Ref. |
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dB(A) |
% |
dB(A) |
dB(A) |
Compactor |
CNP 050 |
2 |
105.0 |
100% |
0 |
108 |
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Total |
108 |
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Activity D - Reinstating Road
Surface |
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Powered Mechanical Equipment |
TM Ref./ |
No. of Items |
SWL/Item |
On-time |
Barrier |
Total SWL |
(PME) |
other Ref. |
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dB(A) |
% |
dB(A) |
dB(A) |
Lorry (mini) |
CNP 141 |
1 |
112 |
100% |
0 |
112 |
Concrete mixer
(electric) |
CNP 045 |
1 |
96 |
100% |
0 |
96 |
Air Compressor |
CNP 002 |
1 |
102 |
100% |
0 |
102 |
Generator |
CNP 101 |
1 |
108 |
100% |
0 |
108 |
Vibratory poker hand-held |
CNP 170 |
1 |
113 |
100% |
0 |
113 |
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Total |
116 |
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(II) Demolition of Pui O Raw Water Pumping
Station |
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Activity
A - General Site Clearance / Demolition Works |
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Powered Mechanical Equipment |
TM Ref./ |
No. of Items |
SWL/Item |
On-time |
Barrier |
Total SWL |
(PME) |
other Ref. |
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dB(A) |
% |
dB(A) |
dB(A) |
Air
compressor |
CNP 003 |
1 |
104 |
100% |
0 |
104 |
Hand-held pneumatic breaker |
CNP 026 |
1 |
114 |
100% |
0 |
114 |
Backhoe with hydraulic breaker |
CNP 028 |
1 |
122 |
100% |
0 |
122 |
Mobile Crane |
CNP 048 |
1 |
112 |
100% |
0 |
112 |
Dump truck |
CNP 067 |
1 |
117 |
100% |
0 |
117 |
Excavator |
CNP 081 |
1 |
112 |
100% |
0 |
112 |
Lorry mounted Crane |
CNP 048 |
1 |
112 |
100% |
0 |
112 |
Generator |
CNP 101 |
1 |
108 |
100% |
0 |
108 |
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Total |
125 |
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(III) Construction of Pui O Raw Water Pumping
Station |
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Activity A - Foundation |
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Powered Mechanical Equipment |
TM Ref./ |
No. of Items |
SWL/Item |
On-time |
Barrier |
Total SWL |
(PME) |
other Ref. |
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dB(A) |
% |
dB(A) |
dB(A) |
Air
compressor |
CNP 003 |
1 |
104 |
100% |
0 |
104 |
Piling Rig |
CNP 164/165 |
1 |
115 |
100% |
0 |
115 |
Backhoe with hydraulic breaker |
CNP 028 |
1 |
122 |
100% |
0 |
122 |
Mobile Crane |
CNP 048 |
1 |
112 |
100% |
0 |
112 |
Dump truck |
CNP 067 |
1 |
117 |
100% |
0 |
117 |
Excavator |
CNP 081 |
1 |
112 |
100% |
0 |
112 |
Water Pump |
CNP
281 |
1 |
88 |
100% |
0 |
88 |
Generator |
CNP 101 |
1 |
108 |
100% |
0 |
108 |
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Total |
124 |
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Activity B - Superstructural
Works |
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Powered Mechanical Equipment |
TM Ref./ |
No. of Items |
SWL/Item |
On-time |
Barrier |
Total SWL |
(PME) |
other Ref. |
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dB(A) |
% |
dB(A) |
dB(A) |
Air
compressor |
CNP 003 |
1 |
104 |
100% |
0 |
104 |
Bar Bender and Cutter |
CNP
021 |
1 |
90 |
100% |
0 |
90 |
Concrete Mixer Truck |
CNP 028 |
1 |
122 |
100% |
0 |
122 |
Concrete Poker
Vibrator |
CNP 170 |
1 |
113 |
100% |
0 |
113 |
Concrete Pump |
CNP
047 |
1 |
109 |
100% |
0 |
109 |
Mobile Crane |
CNP 048 |
1 |
112 |
100% |
0 |
112 |
Dump truck |
CNP 067 |
1 |
117 |
100% |
0 |
117 |
Excavator |
CNP 081 |
1 |
112 |
100% |
0 |
112 |
Generator |
CNP 101 |
1 |
108 |
100% |
0 |
108 |
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Total |
124 |
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Activity
C - Installation of E&M Equipment and Commissioning & Testing |
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Powered Mechanical Equipment |
TM Ref./ |
No. of Items |
SWL/Item |
On-time |
Barrier |
Total SWL |
(PME) |
other Ref. |
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dB(A) |
% |
dB(A) |
dB(A) |
Mobile Crane |
CNP
048 |
1 |
112 |
100% |
0 |
112 |
Lorry |
CNP
141 |
1 |
112 |
50% |
0 |
109 |
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Total |
114 |
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Note: |
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BS BS5228 (1997) Part 1 Noise and Vibration
Control on Construction and open sites |
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