Environmental
Legislation, & Standards
Identification of
Environmental Impacts
Mitigation of Adverse
Environmental Impacts
Construction Works
During Restricted Hours
Residual
Environmental Impacts
Environmental
Monitoring and Audit Requirements
Table 3.1 EIAO-TM Daytime Construction Noise Standards
Table 3.2 Acceptable Noise Levels (ANL, Leq, 5min dB(A))
Table 3.3 Road Traffic Noise Planning Criteria
Table 3.4 Representative Noise Sensitive Receivers
Table 3.5 A Summary of Cumulative Construction Noise Impacts
(Without Mitigation)
Table 3.6 Predicted Road Traffic Noise Levels in 2022
(Without Mitigation)
Table 3.7 Sound Power Levels for Specific Quiet PME
Table 3.8 A Summary of Cumulative Construction Noise Impacts
(Mitigated – Use of Quiet PME)
Table 3.10 Predicted Road Traffic Noise Levels in 2022 (With
Mitigation)
Table 3.11 Area Sensitivity Ratings for NSRs Selected for the
Indicative Assessment
Figure 3.1 San Tin – Outline Zoning Plan
Figure 3.2a Noise Sensitive Receivers within 300m from
the Project Boundary
Figure 3.2b Locations of Representative Noise Sensitive
Receivers
Figure 3.3 Construction Work Areas
Figure 3.4 Locations of Noise Barriers Proposed in Other
Project
Figure 3.5 Locations of Proposed Movable Noise Barriers
Figure 3.6 Locations of Proposed Noise Barriers
Figure 3.7 Typical Cross-Section of Proposed Noise
Barriers
Figure 3.8 Plan of Movable Barrier for Segment Carrier
Appendix 3.1 Extent of Defined New Road
Appendix 3.2 Prevailing Road Traffic Noise Levels
Appendix 3.3 Powered Mechanical Equipment for Various
Construction Activities (Unmitigated)
Appendix 3.4 Endorsement Letter from Transport Department
Appendix 3.5 Sample Computer Outputs of Road Traffic Noise
Calculations
Appendix 3.6 Predicated Construction Noise Levels
(Unmitigated)
Appendix 3.7 Assessment for Cumulative Construction Noise
Impact from Concurrent Projects
Appendix 3.8 Road Traffic Noise Assessment Results`
Appendix 3.9 Powered Mechanical Equipment for Various
Construction Activities (Mitigated-Use of Quiet Equipment)
Appendix 3.10 Predicted Construction Noise Levels
(Mitigated-Use of Quiet PME)
Appendix 3.11 Powered Mechanical Equipment for Various
Construction Activities (Mitigated-Use of Quiet Equipment and Movable Noise
Barriers)
Appendix 3.12 Predicted Construction Noise Levels
(Mitigated-Use of Quiet Equipment and Movable Noise Barriers
Appendix 3.13 Assessment for Construction Noise Impact
During Restricted Hours
Appendix 3.14 Assessment of Noise Sensitive Receivers
Eligible for Indirect Technical Remedies
· Technical Memorandum on Noise from Places other than Domestic Premises, Public Places or Construction Sites (IND-TM);
· Technical Memorandum on Noise from Construction Work in Designated Areas (DA-TM);
· Technical Memorandum on Noise from Construction Work other than Percussive Piling (GW-TM);
· Technical Memorandum on Noise from Percussive Piling (PP-TM); and
· Technical Memorandum on Environmental Impact Assessment Process (EIAO-TM).
Table 3.1 EIAO-TM Daytime Construction Noise Standards
Uses |
Noise Standard (Leq, 30 min dB(A)) |
Domestic Premises |
75 |
Educational Institutions (normal periods) |
70 |
Educational Institutions (during examination periods) |
65 |
Table 3.2 Acceptable Noise Levels (ANL, Leq, 5min dB(A))
Time Period |
Area Sensitivity Rating |
||
A |
B |
C |
|
All days during the evening (1900-2300 hours) and general holidays (including Sundays) during the day and evening (0700-2300 hours) |
60 |
65 |
70 |
All days during the night-time (2300-0700 hours) |
45 |
50 |
55 |
Factors such as ASRs, ANLs, etc could affect the assessment results of a CNP application. The Noise Control Authority would decide these at the time of assessment of such an application based on the contemporary situations/conditions. It should be noted that the situations/conditions around the sites might change from time to time.
Table 3.3 Road Traffic Noise Planning Criteria
Uses |
Road Traffic Noise, L10 (1hr) dB(A) |
Domestic premises, hotel, hostels, and offices |
70 |
Educational Institutions |
65 |
Hospital and clinics |
55 |
Place of public worship and courts of law |
65 |
Note: The criteria presented in the above apply to noise sensitive uses which rely on opened window for ventilation. |
1) The predicted overall noise level from the new road, together with other traffic noise in the vicinity must be above 70 dB(A) for residential dwellings, 65 dB(A) for education institutions and place of public worship, all in L10(1hr).
2) The predicted overall noise level is at least 1.0 dB(A) more than the prevailing traffic noise level, i.e. the total traffic noise level existing before the works to construct the road were commenced.
3) The contribution to the increase in the predicted overall noise level from the new road must be at least 1.0 dB(A).
Table 3.4 Representative Noise Sensitive Receivers
NSR ID |
Location |
Use |
No. of Floors |
Ground Elevation (mPD) |
No. of Dwellings/ Classrooms Represented |
Nearest Distance from Project Boundary (m) |
V02 |
Village house near San Tin Highway |
Residential |
2 |
14 |
3 |
225 |
V03 |
Village house near San Tin Highway |
Residential |
1 |
10.9 |
1 |
180 |
V04 |
Village house near San Tin Highway |
Residential |
1 |
11.4 |
6 |
135 |
V05 |
Village house near San Tin Highway |
Residential |
2 |
5.9 |
2 |
20 |
V06* |
Village house near San Tin Highway |
Residential |
2 |
5.9 |
2 |
10 |
V07 |
Village house near Tai Fu Tai |
Residential |
2 (1) |
6.1 |
6 |
75 |
V08 |
Village house near Tai Fu Tai |
Residential |
2 (1) |
6.2 |
4 |
110 |
V09 |
Village house near Tai Fu Tai |
Residential |
1 |
6.2 |
1 |
115 |
V10* |
Village house at Wing Ping Tsuen |
Residential |
3 |
3.9 |
3 |
150 |
V11 |
Village house at Wing Ping Tsuen |
Residential |
3 |
3.9 |
6 |
160 |
V12 |
Village house at Wing Ping Tsuen |
Residential |
3 |
3.1 |
12 |
245 |
V13 |
Village house at Tung Chan Wai |
Residential |
3 |
3.1 |
12 |
260 |
V14 |
Village house at Tung Chan Wai |
Residential |
2 |
2.9 |
5 |
285 |
V15 |
Village house at Tung Chan Wai |
Residential |
4 |
2.0 |
10 |
300 |
V16 |
Village house near San Tin Highway |
Residential |
1 |
9.5 |
1 |
140 |
V17 |
Village house near Ka Lung Road |
Residential |
3 |
11.8 |
3 |
105 |
V18* |
Village house near San Tin Highway |
Residential |
1 |
6.5 |
1 |
30 |
V19* |
Village house near San Tin Highway |
Residential |
2 |
5.1 |
2 |
40 |
V20* |
Village house near Kwu Tung Road |
Residential |
1 |
4.0 |
2 |
45 |
V22* |
Village house near Kwu Tung Road |
Residential |
2 |
8.6 |
3 |
35 |
V23* |
Village house near Kwu Tung Road |
Residential |
1 |
8.6 |
3 |
95 |
V24 |
Village house near Kwu Tung Road |
Residential |
3 |
14.0 |
3 |
100 |
V25 |
Village house near Kwu Tung Road |
Residential |
2 |
10.4 |
2 |
70 |
V26 |
Village house near Kwu Tung Road |
Residential |
2 |
18.0 |
2 |
50 |
V27 |
Village house near Castle Peak Road |
Residential |
2 |
7.7 |
2 |
55 |
V28* |
Village house near Castle Peak Road |
Residential |
2 |
6.4 |
4 |
75 |
V29 |
Village house near Lok Ma Chau Road |
Residential |
3 |
3.5 |
3 |
270 |
V30* |
Village house near Lok Ma Chau Road |
Residential |
1 |
5.3 |
1 |
105 |
Sch1* |
Tun Yu School |
Educational Institution |
1 |
8.7 |
9 |
120 |
T01 |
Temple near Tun Yu School |
Place of worship |
1 |
6.1 |
1 |
105 |
P01, P03 |
Assessment point for the ‘V’ Zone |
Residential |
3 |
3.9 |
-- |
5 |
P02 |
Assessment point for the ‘V’ Zone |
Residential |
3 |
3.9 |
-- |
10 |
P04 – P07 |
Assessment point for the ‘OU(CDWEA)’ Zone |
Residential |
|
5.6 |
-- |
5 |
Note: * Selected for construction noise assessment.
(1) Ground floor is retail.
1) Site clearance
2) Site formation
3) Construct retaining walls/slopes
4) Construct bored piles
5) Cast pilecaps and piers
6) Construct abutments
7) Construct slip roads
8) Widening of Castle Peak Road
9) Erect segments by launching girder/mobile cranes
10) Erect segments of on falsework for side spans
11) Cast concrete parapets and install movement joints
12) Road pavement and road marking
Project |
Anticipated Construction Programme |
East Rail Extension – Sheung Shui to Lok Ma Cha Spur Line (KCRC Spur Line) |
December 2002 to September 2006 |
San Tin Eastern Main Drainage Channel (EMDC) |
October 2002 to June 2006 |
Drainage Channels in Northern New Territories – NTM04 |
October 2005 to October 2009 |
Table 3.5 A Summary of Cumulative Construction Noise Impacts (Without Mitigation)
NSR ID |
Location |
Predicted Construction Noise Levels, dB(A) |
Sch1 |
Tun Yu School |
70-74 |
V06 |
Village house near San Tin Highway |
64-88 |
V10 |
Village house at Wing Ping Tsuen |
61-77 |
V18 |
Village house near San Tin Highway |
62-83 |
V19 |
Village house near San Tin Highway |
64-84 |
V20 |
Village house near Kwu Tung Road |
75-82 |
V22 |
Village house near Kwu Tung Road |
71-82 |
V23 |
Village house near Kwu Tung Road |
63-73 |
V28 |
Village house near Castle Peak Road |
72-74 |
V30 |
Village house near Lok Ma Chau Road |
70-74 |
Note: Bold value indicates the exceedance of noise criteria of 75 dB(A) for residential uses, 65 dB(A) for school during examination period.
Table 3.6 Predicted Road Traffic Noise Levels in 2022 (Without Mitigation)
NSR |
Floor |
Assessment Level mPD |
Predicted Noise Level, dB(A) |
Number of Dwellings/Classrooms Exceed the Noise Criteria |
Sch1 |
G |
9.9 |
83 |
9 |
T01 |
G |
7.3 |
63 |
0 |
V02 |
G |
15.2 |
80 |
3 |
|
1 |
18.2 |
81 |
|
V03 |
G |
12.1 |
82 |
1 |
V04 |
G |
12.6 |
84 |
6 |
V05 |
G |
7.1 |
79 |
2 |
|
1 |
10.1 |
81 |
|
V06 |
G |
7.1 |
81 |
2 |
|
1 |
10.1 |
83 |
|
V07 |
1 |
10.3 |
82 |
6 |
V08 |
1 |
10.4 |
75 |
4 |
V09 |
G |
7.4 |
73 |
1 |
V10 |
G |
5.1 |
72 |
3 |
|
1 |
8.1 |
74 |
|
|
2 |
11.1 |
74 |
|
V11 |
G |
5.1 |
70 |
4 |
|
1 |
8.1 |
71 |
|
|
2 |
11.1 |
72 |
|
V12 |
G |
4.3 |
71 |
12 |
|
1 |
7.3 |
72 |
|
|
2 |
10.3 |
72 |
|
V13 |
G |
4.3 |
69 |
0 |
|
1 |
7.3 |
69 |
|
|
2 |
10.3 |
70 |
|
V14 |
G |
4.1 |
68 |
0 |
|
1 |
7.1 |
69 |
|
V15 |
G |
3.2 |
64 |
0 |
|
1 |
6.2 |
65 |
|
|
2 |
9.2 |
66 |
|
|
3 |
12.2 |
66 |
|
V16 |
G |
10.7 |
83 |
1 |
V17 |
G |
13 |
80 |
3 |
|
1 |
16 |
80 |
|
|
2 |
19 |
80 |
|
V18 |
G |
7.7 |
82 |
1 |
V19 |
G |
6.3 |
82 |
2 |
|
1 |
9.3 |
83 |
|
V20 |
G |
5.2 |
73 |
2 |
V22 |
G |
9.8 |
75 |
3 |
|
1 |
12.8 |
77 |
|
V23 |
G |
9.8 |
77 |
3 |
V24 |
G |
15.2 |
77 |
3 |
|
1 |
18.2 |
77 |
|
|
2 |
21.2 |
77 |
|
V25 |
G |
11.6 |
76 |
2 |
|
1 |
14.6 |
79 |
|
V26 |
G |
19.2 |
78 |
2 |
|
1 |
22.2 |
81 |
|
V27 |
G |
8.9 |
82 |
2 |
|
1 |
11.9 |
83 |
|
V28 |
G |
7.6 |
80 |
4 |
|
1 |
10.6 |
80 |
|
V29 |
G |
4.7 |
70 |
0 |
|
1 |
7.7 |
70 |
|
|
2 |
10.7 |
70 |
|
V30 |
G |
6.5 |
68 |
0 |
P01 |
G |
5.1 |
80 |
-- |
|
1 |
8.1 |
81 |
|
|
2 |
11.1 |
80 |
|
P02 |
G |
5.1 |
76 |
-- |
|
1 |
8.1 |
78 |
|
|
2 |
11.1 |
78 |
|
P03 |
G |
5.1 |
76 |
-- |
|
1 |
8.1 |
76 |
|
|
2 |
11.1 |
75 |
|
P04 |
1 |
6.8 |
73 |
-- |
|
3 |
12.4 |
74 |
|
|
6 |
20.8 |
75 |
|
P05 |
1 |
6.8 |
73 |
-- |
|
3 |
12.4 |
|
|
|
6 |
20.8 |
|
|
P06 |
1 |
6.8 |
73 |
-- |
|
3 |
12.4 |
|
|
|
6 |
20.8 |
|
|
P07 |
1 |
6.8 |
72 |
-- |
|
3 |
12.4 |
|
|
|
6 |
20.8 |
|
|
Note: Bold value indicates the exceedance of EIAO-TM noise criteria of 70dB(A) for residential uses or 65dB(A) for schools and places of worship
-- Not Applicable
· Good Site Practice
· Use of quiet PME; and
· Adoption of movable noise barriers.
· All plant operated on-site should be well maintained and plant should be serviced regularly during the construction works;
· Machines and plant that may be in intermittent use should be shut down between work periods or should be throttled down to a minimum;
· Plant known to emit noise strongly in one direction should, where possible, be orientated to direct noise away from the NSRs;
· Mobile plant should be sited as far away from NSRs as possible; and
· Material stockpiles and other structures should be effectively utilised, where practicable, to screen noise from on-site construction activities.
Table 3.7 Sound Power Levels for Specific Quiet PME
PME |
BS5228 |
SWL/Item, dB(A) |
Backhoes |
Table C3, item 97 |
105 |
Dump Truck |
Table C9, item 39 |
103 |
10T Roller |
Table C8, item 30 |
101 |
3T Roller |
Table C8, item 25 |
96 |
30T Crane |
Table C7, item 112 |
102 |
100T Crane |
Table C.7, item 105 |
108 |
Segments Carriers |
Table C3, item 59 |
105 |
Paver |
Table C8, item 24 |
101 |
Hydraulic Breaker |
Table C8, item 13 |
110 |
Rubber Tyre Roller |
Table C8, item 25 |
96 |
Table 3.8 A Summary of Cumulative Construction Noise Impacts (Mitigated – Use of Quiet PME)
NSR ID |
Location |
Predicted Construction Noise Levels, dB(A) |
Sch1 |
Tun Yu School |
60-64 |
V06 |
Village house near San Tin Highway |
57-79 |
V10 |
Village house at Wing Ping Tsuen |
52-69 |
V18 |
Village house near San Tin Highway |
53-75 |
V19 |
Village house near San Tin Highway |
55-74 |
V20 |
Village house near Kwu Tung Road |
65-77 |
V22 |
Village house near Kwu Tung Road |
62-74 |
Note: Bold value indicates the exceedance of noise criteria of 75 dB(A) for residential uses, 70 dB(A) for school during normal hour
Table 3.9 A Summary of Cumulative Construction Noise Impacts (Mitigated – Use of Quiet PME and Movable Noise Barriers)
NSR ID |
Location |
Predicted Construction Noise Levels, dB(A) |
V06 |
Village house near San Tin Highway |
57-75 |
V20 |
Village house near Kwu Tung Road |
64-74 |
Note: Bold value indicates the exceedance of noise criteria of 75 dB(A) for residential uses
· Not on inclined roads;
· No sharp bend in road geometry;
· Average Annual Daily Traffic not exceeding 18,500 in traffic volume and percentage of heavy vehicles not exceeding 35%; and
· Not on roads where a minimum crossfall of 2.5% cannot be practically achieved to drain water to the roadside gullies effectively.
· A 1.5m high reflective plain barrier of about 121m long erected along the western edge of Slip Road A.
·
A 5m high
cantilevered barrier with 2m cantilever at 45 o
(reflective) of about 30m long be erected at
the junction of Castle Peak Road and slip road of San Tin Highway.
·
A 4.25m high reflective plain barrier of about 303m be erected along Slip Road
F.
Table 3.10 Predicted Road Traffic Noise Levels in 2022 (With Mitigation)
NSR |
Floor |
Assessment Level mPD |
Predicted Noise Level, dB(A) |
|
Mitigation – Existing NSRs |
Mitigation – Existing & Future/Planned NSRs |
|||
Sch1 |
G |
9.9 |
83 |
83 |
T01 |
G |
7.3 |
63 |
63 |
V02 |
G |
15.2 |
80 |
80 |
|
1 |
18.2 |
81 |
81 |
V03 |
G |
12.1 |
82 |
82 |
V04 |
G |
12.6 |
84 |
84 |
V05 |
G |
7.1 |
76 |
76 |
|
1 |
10.1 |
79 |
79 |
V06 |
G |
7.1 |
77 |
77 |
|
1 |
10.1 |
81 |
81 |
V07 |
1 |
10.3 |
82 |
82 |
V08 |
1 |
10.4 |
74 |
74 |
V09 |
G |
7.4 |
73 |
73 |
V10 |
G |
5.1 |
71 |
71 |
|
1 |
8.1 |
73 |
73 |
|
2 |
11.1 |
74 |
74 |
V11 |
G |
5.1 |
70 |
70 |
|
1 |
8.1 |
71 |
71 |
|
2 |
11.1 |
71 |
71 |
V12 |
G |
4.3 |
71 |
71 |
|
1 |
7.3 |
71 |
71 |
|
2 |
10.3 |
72 |
72 |
V13 |
G |
4.3 |
69 |
69 |
|
1 |
7.3 |
69 |
69 |
|
2 |
10.3 |
70 |
69 |
V14 |
G |
4.1 |
68 |
68 |
|
1 |
7.1 |
69 |
68 |
V15 |
G |
3.2 |
64 |
63 |
|
1 |
6.2 |
65 |
65 |
|
2 |
9.2 |
66 |
65 |
|
3 |
12.2 |
66 |
66 |
V16 |
G |
10.7 |
83 |
83 |
V17 |
G |
13 |
80 |
80 |
|
1 |
16 |
80 |
80 |
|
2 |
19 |
80 |
80 |
V18 |
G |
7.7 |
83 |
83 |
V19 |
G |
6.3 |
82 |
82 |
|
1 |
9.3 |
83 |
83 |
V20 |
G |
5.2 |
73 |
73 |
V22 |
G |
9.8 |
75 |
75 |
|
1 |
12.8 |
77 |
77 |
V23 |
G |
9.8 |
77 |
77 |
V24 |
G |
15.2 |
77 |
77 |
|
1 |
18.2 |
77 |
77 |
|
2 |
21.2 |
77 |
77 |
V25 |
G |
11.6 |
76 |
76 |
|
1 |
14.6 |
79 |
79 |
V26 |
G |
19.2 |
78 |
78 |
|
1 |
22.2 |
81 |
81 |
V27 |
G |
8.9 |
82 |
82 |
|
|
11.9 |
83 |
83 |
V28 |
G |
7.6 |
80 |
80 |
|
1 |
10.6 |
80 |
80 |
V29 |
G |
4.7 |
70 |
70 |
|
1 |
7.7 |
70 |
70 |
|
2 |
10.7 |
70 |
70 |
V30 |
G |
6.5 |
68 |
68 |
P01 |
G |
5.1 |
80 |
80 |
|
1 |
8.1 |
81 |
81 |
|
2 |
11.1 |
80 |
80 |
P02 |
G |
5.1 |
76 |
76 |
|
1 |
8.1 |
78 |
78 |
|
2 |
11.1 |
78 |
78 |
P03 |
G |
5.1 |
76 |
75 |
|
1 |
8.1 |
76 |
75 |
|
2 |
11.1 |
75 |
75 |
P04 |
1 |
6.8 |
73 |
69 |
|
|
|
|
72 |
|
|
|
|
74 |
P05 |
1 |
6.8 |
73 |
70 |
|
3 |
12.4 |
|
72 |
|
6 |
20.8 |
75 |
74 |
P06 |
1 |
6.8 |
73 |
71 |
|
3 |
12.4 |
|
73 |
|
6 |
20.8 |
75 |
74 |
P07 |
1 |
6.8 |
72 |
72 |
|
3 |
12.4 |
72 |
72 |
|
6 |
20.8 |
|
72 |
Note: Bold value indicates the exceedance of EIAO-TM noise criteria of 70dB(A) for residential uses or 65dB(A) for schools and places of worship
Table 3.11 Area Sensitivity Ratings for NSRs Selected for the Indicative Assessment
NSR |
Influencing Factor (IF) |
Degree to which NSR is affected by IF |
ASR |
V10 |
San Tin Highway |
Directly |
B |
V19 |
San Tin Highway |
Directly |
B |
V20 |
San Tin Highway |
Directly |
B |
[1] Sheung Shui to Lok Ma Chau Spur Line Environmental Impact Assessment Final Report. January 2002. KCRC