Appendix 4.2
Construction Noise Impact Assessment |
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(D1) Calculation of Construction Noise Levels
at Representative Noise Sensitive Receivers - Mitigated (Quite Plant) |
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NSR:
"LUT" |
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SWL |
Distance |
B.C.* |
CNL |
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|
Cumulative Activities |
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|
Activity |
|
(dB(A)) |
(m) |
(dB(A)) |
(dB(A)) |
(I) |
(II) |
(III) |
(I)+(II) |
(I)+(III)A |
(I)+(III)B |
(I) + (III)C |
(I) Water Mains Construction |
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|
A |
Excavation
of Trench / Breaking up Pavement |
108 |
14 |
|
80 |
80 |
- |
- |
- |
- |
- |
- |
B |
Installation of Pipes and Bedding |
103 |
14 |
|
75 |
75 |
- |
- |
- |
- |
- |
- |
C |
Backfilling |
108 |
14 |
|
80 |
80 |
- |
- |
- |
- |
- |
- |
D |
Reinstating Road Surface |
105 |
14 |
|
77 |
77 |
- |
- |
- |
- |
- |
- |
(II) Demolishment of Pui O Raw Water Pumping
Station |
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|
A |
General Site Clearance / Demolition Works |
114 |
- |
|
- |
- |
- |
- |
- |
- |
- |
- |
(III) Construction of Pui O Raw Water Pumping
Station |
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A |
Foundation |
113 |
- |
|
- |
- |
- |
- |
- |
- |
- |
- |
B |
Superstructural Works |
112 |
- |
|
- |
- |
- |
- |
- |
- |
- |
- |
C |
Installation of E&M Equipment and Commissioning &
Testing |
102 |
- |
|
- |
- |
- |
- |
- |
- |
- |
- |
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NSR:
"BOS" (During Normal Teaching Period) |
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|
SWL |
Distance |
B.C.* |
CNL |
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|
Cumulative Activities |
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|
|
Activity |
|
(dB(A)) |
(m) |
(dB(A)) |
(dB(A)) |
(I) |
(II) |
(III) |
(I)+(II) |
(I)+(III)A |
(I)+(III)B |
(I) + (III)C |
(I) Water Mains Construction |
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|
|
|
|
|
A |
Excavation
of Trench / Breaking up Pavement |
108 |
24 |
|
75 |
75 |
- |
- |
- |
- |
- |
- |
B |
Installation of Pipes and Bedding |
103 |
24 |
|
70 |
70 |
- |
- |
- |
- |
- |
- |
C |
Backfilling |
108 |
24 |
|
75 |
75 |
- |
- |
- |
- |
- |
- |
D |
Reinstating Road Surface |
105 |
24 |
|
72 |
72 |
- |
- |
- |
- |
- |
- |
(II) Demolishment of Pui O Raw Water Pumping
Station |
|
|
|
|
|
A |
General Site Clearance / Demolition Works |
114 |
- |
|
- |
- |
- |
- |
- |
- |
- |
- |
(III) Construction of Pui O Raw Water Pumping
Station |
|
|
- |
|
- |
- |
- |
- |
A |
Foundation |
113 |
- |
|
- |
- |
- |
- |
- |
- |
- |
- |
B |
Superstructural Works |
112 |
- |
|
- |
- |
- |
- |
- |
- |
- |
- |
C |
Installation of E&M Equipment and Commissioning &
Testing |
102 |
- |
|
- |
- |
- |
- |
- |
- |
- |
- |
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|
NSR:
"LWT1" |
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|
SWL |
Distance |
B.C.* |
CNL |
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|
|
Cumulative Activities |
|
|
|
Activity |
|
(dB(A)) |
(m) |
(dB(A)) |
(dB(A)) |
(I) |
(II) |
(III) |
(I)+(II) |
(I)+(III)A |
(I)+(III)B |
(I) + (III)C |
(I) Water Mains Construction |
|
|
|
|
|
|
|
A |
Excavation
of Trench / Breaking up Pavement |
108 |
13 |
|
81 |
81 |
- |
- |
- |
- |
- |
- |
B |
Installation of Pipes and Bedding |
103 |
13 |
|
76 |
76 |
- |
- |
- |
- |
- |
- |
C |
Backfilling |
108 |
13 |
|
81 |
81 |
- |
- |
- |
- |
- |
- |
D |
Reinstating Road Surface |
105 |
13 |
|
78 |
78 |
- |
- |
- |
- |
- |
- |
(II) Demolishment of Pui O Raw Water Pumping
Station |
|
|
|
|
|
A |
General Site Clearance / Demolition Works |
114 |
- |
|
- |
- |
- |
- |
- |
- |
- |
- |
(III) Construction of Pui O Raw Water Pumping
Station |
|
|
- |
|
- |
- |
- |
- |
A |
Foundation |
113 |
- |
|
- |
- |
- |
- |
- |
- |
- |
- |
B |
Superstructural Works |
112 |
- |
|
- |
- |
- |
- |
- |
- |
- |
- |
C |
Installation of E&M Equipment and Commissioning &
Testing |
102 |
- |
|
- |
- |
- |
- |
- |
- |
- |
- |
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|
NSR:
"LWT2" |
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|
SWL |
Distance |
B.C.* |
CNL |
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|
Cumulative Activities |
|
|
|
Activity |
|
(dB(A)) |
(m) |
(dB(A)) |
(dB(A)) |
(I) |
(II) |
(III) |
(I)+(II) |
(I)+(III)A |
(I)+(III)B |
(I) + (III)C |
(I) Water Mains Construction |
|
|
|
|
|
|
|
A |
Excavation
of Trench / Breaking up Pavement |
108 |
34 |
|
72 |
72 |
- |
- |
74 |
74 |
73 |
72 |
B |
Installation of Pipes and Bedding |
103 |
34 |
|
67 |
67 |
- |
- |
71 |
71 |
70 |
67 |
C |
Backfilling |
108 |
34 |
|
73 |
73 |
- |
- |
74 |
74 |
74 |
73 |
D |
Reinstating Road Surface |
105 |
34 |
|
69 |
69 |
- |
- |
72 |
72 |
71 |
70 |
(II) Demolishment of Pui O Raw Water Pumping
Station |
|
|
|
|
|
A |
General Site Clearance / Demolition Works |
114 |
99 |
|
69 |
- |
69 |
- |
- |
- |
- |
- |
(III) Construction of Pui O Raw Water Pumping
Station |
|
|
|
|
|
A |
Foundation |
113 |
99 |
|
68 |
- |
- |
68 |
- |
- |
- |
- |
B |
Superstructural Works |
112 |
99 |
|
67 |
- |
- |
67 |
- |
- |
- |
- |
C |
Installation of E&M Equipment and Commissioning &
Testing |
102 |
99 |
|
57 |
- |
- |
57 |
- |
- |
- |
- |
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NSR:
"LWT3" |
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|
SWL |
Distance |
B.C.* |
CNL |
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|
|
Cumulative Activities |
|
|
|
Activity |
|
(dB(A)) |
(m) |
(dB(A)) |
(dB(A)) |
(I) |
(II) |
(III) |
(I)+(II) |
(I)+(III)A |
(I)+(III)B |
(I) + (III)C |
(I) Water Mains Construction * |
|
|
|
|
|
|
|
A |
Excavation
of Trench / Breaking up Pavement |
108 |
128 |
10 |
50 |
50 |
- |
- |
75 |
74 |
73 |
63 |
B |
Installation of Pipes and Bedding |
103 |
128 |
10 |
45 |
45 |
- |
- |
75 |
74 |
73 |
63 |
C |
Backfilling |
108 |
128 |
10 |
51 |
51 |
- |
- |
75 |
74 |
73 |
63 |
D |
Reinstating Road Surface |
105 |
128 |
10 |
48 |
48 |
- |
- |
75 |
74 |
73 |
63 |
(II) Demolishment of Pui O Raw Water Pumping
Station |
|
|
|
|
|
A |
General Site Clearance / Demolition Works |
114 |
51 |
|
75 |
- |
75 |
- |
- |
- |
- |
- |
(III) Construction of Pui O Raw Water Pumping
Station |
|
|
|
|
|
A |
Foundation |
113 |
51 |
|
74 |
- |
- |
74 |
- |
- |
- |
- |
B |
Superstructural Works |
112 |
51 |
|
73 |
- |
- |
73 |
- |
- |
- |
- |
C |
Installation of E&M Equipment and Commissioning &
Testing |
102 |
51 |
|
62 |
- |
- |
62 |
- |
- |
- |
- |
*
As the receiver's line of sight to the water main works would be blocked by
first and second layer of the other buildings and the topographic effect,
noise attenuation of 10 dB(A) |
have been considered in the assessment. |
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NSR:
"ALWT1" |
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|
SWL |
Distance |
B.C.* |
CNL |
|
|
|
Cumulative Activities |
|
|
|
Activity |
|
(dB(A)) |
(m) |
(dB(A)) |
(dB(A)) |
(I) |
(II) |
(III) |
(I)+(II) |
(I)+(III)A |
(I)+(III)B |
(I) + (III)C |
(I) Water Mains Construction |
|
|
|
|
|
|
|
A |
Excavation
of Trench / Breaking up Pavement |
108 |
64 |
|
66 |
66 |
- |
- |
71 |
71 |
70 |
67 |
B |
Installation of Pipes and Bedding |
103 |
64 |
|
61 |
61 |
- |
- |
70 |
69 |
68 |
63 |
C |
Backfilling |
108 |
64 |
|
67 |
67 |
- |
- |
71 |
71 |
70 |
67 |
D |
Reinstating Road Surface |
105 |
64 |
|
64 |
64 |
- |
- |
71 |
70 |
69 |
65 |
(II) Demolishment of Pui O Raw Water Pumping
Station |
|
|
|
|
|
A |
General Site Clearance / Demolition Works |
114 |
98 |
|
70 |
- |
70 |
- |
- |
- |
- |
- |
(III) Construction of Pui O Raw Water Pumping
Station |
|
|
|
|
|
A |
Foundation |
113 |
98 |
|
68 |
- |
- |
68 |
- |
- |
- |
- |
B |
Superstructural Works |
112 |
98 |
|
67 |
- |
- |
67 |
- |
- |
- |
- |
C |
Installation of E&M Equipment and Commissioning &
Testing |
102 |
98 |
|
57 |
- |
- |
57 |
- |
- |
- |
- |
|
|
NSR:
"ALWT2" |
|
|
|
|
|
|
|
SWL |
Distance |
B.C.* |
CNL |
|
|
|
Cumulative Activities |
|
|
|
Activity |
|
(dB(A)) |
(m) |
(dB(A)) |
(dB(A)) |
(I) |
(II) |
(III) |
(I)+(II) |
(I)+(III)A |
(I)+(III)B |
(I) + (III)C |
(I) Water Mains Construction |
|
|
|
|
|
|
|
A |
Excavation
of Trench / Breaking up Pavement |
108 |
32 |
|
72 |
72 |
- |
- |
73 |
73 |
73 |
73 |
B |
Installation of Pipes and Bedding |
103 |
32 |
|
67 |
67 |
- |
- |
70 |
70 |
69 |
68 |
C |
Backfilling |
108 |
32 |
|
73 |
73 |
- |
- |
74 |
74 |
73 |
73 |
D |
Reinstating Road Surface |
105 |
32 |
|
70 |
70 |
- |
- |
72 |
71 |
71 |
70 |
(II) Demolishment of Pui O Raw Water Pumping
Station |
|
|
|
|
|
A |
General Site Clearance / Demolition Works |
114 |
137 |
|
67 |
- |
67 |
- |
- |
- |
- |
- |
(III) Construction of Pui O Raw Water Pumping
Station |
|
|
|
|
|
A |
Foundation |
113 |
137 |
|
65 |
- |
- |
65 |
- |
- |
- |
- |
B |
Superstructural Works |
112 |
137 |
|
64 |
- |
- |
64 |
- |
- |
- |
- |
C |
Installation of E&M Equipment and Commissioning &
Testing |
102 |
137 |
|
54 |
- |
- |
54 |
- |
- |
- |
- |
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(D2) Calculation of Construction Noise Levels
at Representative Noise Sensitive Receiver BOS (during examination period) |
|
- Mitigated (Quite Plant) |
|
|
|
|
|
|
|
NSR:
"BOS" |
|
|
|
|
|
|
|
|
SWL |
Distance |
B.C.* |
CNL |
|
|
|
Cumulative Activities |
|
|
|
Activity |
|
(dB(A)) |
(m) |
(dB(A)) |
(dB(A)) |
(I) |
(II) |
(III) |
(I)+(II) |
(I)+(III)A |
(I)+(III)B |
(I) + (III)C |
(I) Water Mains Construction |
|
|
|
|
|
|
|
A |
Excavation
of Trench / Breaking up Pavement |
102 |
24 |
|
70 |
70 |
- |
- |
- |
- |
- |
- |
B |
Installation of Pipes and Bedding |
100 |
24 |
|
67 |
67 |
- |
- |
- |
- |
- |
- |
C |
Backfilling |
108 |
24 |
|
75 |
75 |
- |
- |
- |
- |
- |
- |
D |
Reinstating Road Surface |
105 |
24 |
|
72 |
72 |
- |
- |
- |
- |
- |
- |
(II) Demolishment of Pui O Raw Water Pumping
Station |
|
|
|
|
|
A |
General Site Clearance / Demolition Works |
114 |
- |
|
- |
- |
- |
- |
- |
- |
- |
- |
(III) Construction of Pui O Raw Water Pumping
Station |
|
|
- |
|
- |
- |
- |
- |
A |
Foundation |
113 |
- |
|
- |
- |
- |
- |
- |
- |
- |
- |
B |
Superstructural Works |
112 |
- |
|
- |
- |
- |
- |
- |
- |
- |
- |
C |
Installation of E&M Equipment and Commissioning &
Testing |
102 |
- |
|
- |
- |
- |
- |
- |
- |
- |
- |
|
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|
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|
List
of Abbreviations: |
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SWL
- Sound Power Level |
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CNL
- Corrected Noise Level |
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