Revision History
0 |
1st Submission |
27/6/2018 |
1 |
2nd Submission |
3/7/2018 |
Rev. |
Description of Modification |
Date |
CONTENT
1.2 Purpose of the Baseline Monitoring Report
2.2 Noise Monitoring Parameters, Time, Frequency and Duration
2.3 Noise Monitoring Locations
2.4 Baseline Monitoring Methodology
List of Appendix
Appendix A Construction Programme
Appendix B Monitoring Scheulde
Appendix C Noise Monitoring Equipment Calibration Certificates
The proposed Desalination Plant at Tseung Kwan O (DPTKO) will produce potable water with an initial capacity of 135 million liters per day (MLD), expandable to an ultimate capacity of 270 Mld in the future to provide a secure and alternative fresh water resource complying with the World Health Organization (WHO) standards. The plant will adopt the Seawater Reverse Osmosis (SWRO) technology, which dominates the market due to its reliability and progressive reduction in cost as the technology advances.
In accordance with the approved Environmental Monitoring and Audit Manual (EM&A Manual) for the Project, baseline environmental monitoring for noise impact should be conducted prior to the commencement of construction works. Pursuant to EP Condition 3.4, Baseline Monitoring Report shall be submitted to the Director of Environmental Protection at least 2 weeks before the commencement of construction of the Project. Baseline monitoring for noise impact was conducted according to the EM&A Manual before the commencement of construction works at selected locations at Tseung Kwan O (TKO).
Monitoring on 7/6/2018 & 8/6/2018 were cancelled due to typhoon (Strong Wind Signal, No. 3) and the adverse weather (i.e. strong wind and heavy rain) it brought along; monitoring on 12/6/2018 was cancelled due to amber rainstorm warning. Thus, additional monitoring on 12/6/2018,13/6/2018 were scheduled, and the monitoring on 12/6/2018 was further postponed to 14/6/2018.
Daily baseline noise monitoring for A-weighted levels Leq, L10 and L90 were conducted in a sample period of 30 minutes during daytime (0700 – 1900 hrs). Details of the methodology, locations and results are presented in the report.
The baseline monitoring noise measured levels LAeq(30min.) on daytime (0700-1900 hrs) for the three Noise Sensitive Receivers (NSRs) range from 57.6 dB(A) – 72.6 dB(A). The baseline average levels, NSRs ID and Location are summarized as below. The baseline noise quality monitoring measurement and the result are recorded in Appendix D.
The baseline average levels as follows:
Daytime (0700-1900 hrs) LAeq(30min.) |
||||
NSR ID |
Location |
LAeq (dB(A)) |
L10(dB(A)) |
L90 dB(A) |
NSR4 |
Creative Secondary School |
70.0 |
72.8 |
63.3 |
NSR24* |
PLK Laws Foundation College |
72.0 |
74.4 |
60.3 |
NSR31 |
School of Continuing and Professional Studies - CUHK |
61.6 |
64.8 |
56.0 |
Remarks: *Free field correction +3dB(A) has been made for NSR24
Action and Limit Level Determination for Noise
Results of the baseline noise monitoring data are processed to provide Action Levels [“AL”] and Limit Levels [“LL”] as per the table below:
Time Period |
Action |
NSR ID |
Location |
Type of sensitive receiver(s) |
Measurement Type |
Limit (dB(A)) |
(0700- 1900 hrs) on normal working day |
When one documented complaint is received |
NSR4 |
Creative Secondary School |
Educational |
Facade |
70 dB(A), 65 dB(A) during examination |
NSR24 |
PLK Laws Foundation College |
Educational |
Free-field |
|||
NSR31 |
School of Continuing and Professional Studies - CUHK |
Educational |
Facade |
Figure 1.1 Overview of DPTKO
· Summarise the findings of baseline noise monitoring; and
· Establish the AL and LL in accordance with the EM&A Manual for the subsequent impact monitoring during the construction stage.
· Section 1 introduces the background of the Project and purpose of this Report;
· Section 2 presents the baseline monitoring methodologies, requirements, results, influencing factors, as well as determination of the AL and LL of noise; and
· Section 3 concludes the findings of baseline monitoring.
Table 2.1 Noise Monitoring Parameters, Time, Frequency and Duration
Time |
Frequency |
Duration |
Parameters |
Daytime: 0700-1900 hrs |
Daily for at least 14 days |
Continuously in Leq 5min/Leq 30min (average of 6 consecutive Leq 5min) |
Leq, L10 & L90 |
Table 2.2 Noise Sensitive Receivers
NSR ID |
Noise Sensitive Receivers |
Monitoring Location |
Position |
NSR 4 |
Creative Secondary School |
Roof Floor |
1 m from facade |
NSR 24 |
PLK Laws Foundation College |
Pedestrian Road on Ground Floor |
Free-field |
NSR 31 |
School of Continuing and Professional Studies - CUHK |
Roof Floor |
1 m from facade |
Figure 2.1 NSR4 Creative Secondary School |
5 |
Figure 2.2 NSR24 PLK Laws Foundation College |
Figure 2.3 NSR31 School of Continuing and Professional Studies - CUHK |
Table 2.3 Baseline Noise Monitoring Equipment
Equipment |
Brand and Model |
Detection Limit |
Sound Level Meter |
Nti XL2 |
30-130 dB(A) |
Sound Level Meter Calibrator |
Rion NC-74 |
Nil |
Pocket Wind Meter Anemometer |
Kestrel 1000 Wind Meter |
Nil |
Table 2.4 Summary of Baseline Noise Monitoring Results
NSR ID |
Noise in dB(A) |
|||||
Average |
Range |
|||||
Leq 30min |
L10 30min |
L90 30min |
Leq 30min |
L10 30min |
L90 30min |
|
NSR 4 |
70.0 |
72.8 |
63.3 |
68.8-72.6 |
71.3-75.6 |
59.9-68.7 |
NSR 24* |
72.0 |
74.4 |
60.3 |
68.8-74.9 |
70.9-77.0 |
56.5-64.6 |
NSR 31 |
61.6 |
64.8 |
56.0 |
57.6-69.1 |
60.0-72.2 |
51.4-60.5 |
2.6.3 Monitoring on 7/6/2018 & 8/6/2018 were cancelled due to typhoon (Strong Wind Signal, No. 3) and the adverse weather (i.e. strong wind and heavy rain) it brought along; monitoring on 12/6/2018 was cancelled due to amber rainstorm warning. Thus, additional monitoring on 12/6/2018,13/6/2018 were scheduled, and the monitoring on 12/6/2018 was further postponed to 14/6/2018.
Table 2.4 Action and Limit Levels for Noise
Time Period |
Action |
Limit (dB(A)) |
0700-1900 hrs on normal weekdays |
When one documented complaint is received from any one of the noise sensitive receivers or 75 dB(A) recorded at the monitoring station
|
· 70 dB(A) for school and · 65 dB(A) during examination period |
Notes: (a) Limits specified in the GW-TM and IND-TM for construction and operation noise, respectively. |
Baseline Noise Monitoring Schedule
Date and Monitoring Period |
Noise Monitoring Minimum 30-minutes monitoring period during (0700 – 1900 hrs) |
||
Tue |
29/5/2018 |
09:00 – 12:00 (14:30 for NSR4) |
Leq(30min), L10, L90 |
Wed |
30/5/2018 |
09:00 – 12:00 |
Leq(30min), L10, L90 |
Thu |
31/5/2018 |
09:00 – 12:00 |
Leq(30min), L10, L90 |
Fri |
1/6/2018 |
09:00 – 12:00 |
Leq(30min), L10, L90 |
Sat |
2/6/2018 |
12:00 – 15:00 |
Leq(30min), L10, L90 |
Sun |
3/6/2018 |
12:00 – 15:00 |
Leq(30min), L10, L90 |
Mon |
4/6/2018 |
12:00 – 17:00 |
Leq(30min), L10, L90 |
Tue |
5/6/2018 |
12:00 – 17:00 |
Leq(30min), L10, L90 |
Wed |
6/6/2018 |
15:00 – 18:00 |
Leq(30min), L10, L90 |
Thu |
7/6/2018 |
15:00 – 18:00 |
Leq(30min), L10, L90 |
Fri |
8/6/2018 |
15:00 – 18:00 |
Leq(30min), L10, L90 |
Sat |
9/6/2018 |
15:00 – 18:00 |
Leq(30min), L10, L90 |
Sun |
10/6/2018 |
09:00 – 12:00 |
Leq(30min), L10, L90 |
Mon |
11/6/2018 |
13:30 – 16:30 |
Leq(30min), L10, L90 |
Tue |
12/6/2018 |
15:00 – 18:00 |
Leq(30min), L10, L90 |
Wed |
13/6/2018 |
15:00 – 18:00 |
Leq(30min), L10, L90 |
Thu |
14/6/2018 |
15:00 – 18:00 |
Leq(30min), L10, L90 |
Remark:
1. Monitoring
on 7/6/2018 & 8/6/2018 were cancelled due to typhoon (Strong Wind Signal,
No. 3) and the adverse weather (i.e. strong wind and heavy rain) it brought
along; monitoring on 12/6/2018 was cancelled due to amber rainstorm warning.
Thus, additional monitoring on 12/6/2018,13/6/2018 were scheduled, and the
monitoring on 12/6/2018 was further postponed to 14/6/2018.
NSR ID: |
NSR4 |
Baseline monitoring period: |
29/5/2018 to 14/6/2018 |
Parameter : |
Leq 30min, L10 30min ,L90 30min |
Major Site Activities |
No construction works were conducted in the vicinity during the monitoring period. |
Major dust source |
Nearby traffic and school activities |
Other Factors |
NA |
Date |
Time |
Weather |
Leq-5min, dB(A) |
L-30min, dB(A) |
L10 -30min, dB(A) |
L90-30min, dB(A) |
|||||
Reading (1) |
Reading (2) |
Reading (3) |
Reading (4) |
Reading (5) |
Reading (6) |
||||||
29/5/2018 |
14:37-15:07 |
sunny |
72.1 |
72.3 |
72.9 |
73.3 |
72.4 |
72.7 |
72.6 |
75.6 |
68.7 |
30/5/2018 |
9:53-10:23 |
sunny |
68.7 |
69.0 |
68.6 |
69.6 |
68.8 |
69.4 |
69.0 |
72.3 |
61.0 |
31/5/2018 |
9:18-9:48 |
sunny |
68.9 |
68.2 |
68.7 |
68.8 |
68.4 |
70.9 |
69.1 |
72.0 |
59.9 |
1/6/2018 |
15:20-15:50 |
sunny |
69.4 |
72.7 |
68.7 |
69.5 |
70.1 |
69.1 |
70.1 |
73.0 |
62.3 |
2/6/2018 |
13:59-14:29 |
Fine |
69.5 |
70.8 |
68.2 |
70.6 |
71.4 |
70.7 |
70.3 |
72.5 |
61.8 |
3/6/2018 |
13:53-14:23 |
Fine |
69.1 |
69.4 |
68.0 |
68.8 |
70.1 |
69.5 |
69.2 |
72.4 |
62.0 |
4/6/2018 |
15:42-14:12 |
cloudy |
70.1 |
71.6 |
71.8 |
70.3 |
70.5 |
71.4 |
71.0 |
72.9 |
63.0 |
5/6/2018 |
12:28-12:58 |
cloudy |
69.4 |
68.7 |
69.9 |
70.2 |
71.5 |
70.6 |
70.1 |
72.1 |
62.8 |
6/6/2018 |
16:54-17:24 |
Cloudy |
70.3 |
71.1 |
71.8 |
72.1 |
71.4 |
70.9 |
71.3 |
73.2 |
62.1 |
7/6/2018 |
cancelled due to typhoon and the adverse weather |
||||||||||
8/6/2018 |
cancelled due to typhoon and the adverse weather |
||||||||||
9/6/2018 |
14:26-14:56 |
fine |
68.1 |
67.4 |
69.5 |
69.8 |
70.4 |
70.1 |
69.3 |
71.5 |
62.2 |
10/6/2018 |
14:16-14:46 |
Fine |
68.3 |
69.0 |
68.6 |
69.4 |
68.7 |
69.0 |
68.8 |
71.3 |
61.9 |
11/6/2018 |
13:40-14:10 |
fine |
69.8 |
68.3 |
69.2 |
69.0 |
69.2 |
67.9 |
68.9 |
72.3 |
61.6 |
12/6/2018 |
cancelled due to typhoon and the adverse weather |
||||||||||
13/6/2018 |
15:14-15:44 |
Fine |
68.4 |
69.3 |
68.7 |
69.1 |
69.6 |
70.3 |
69.3 |
73.5 |
63.6 |
14/6/2018 |
15:02-15:35 |
Fine |
68.7 |
69.3 |
69.2 |
68.3 |
69.4 |
69.5 |
69.1 |
72.4 |
64.8 |
NSR ID: |
NSR24 |
Baseline monitoring period: |
29/5/2018 to 14/6/2018 |
Parameter : |
Leq 30min, L10 30min ,L90 30min |
Major Site Activities |
No construction works were conducted in the vicinity during the monitoring period. |
Major dust source |
Nearby traffic and school activities |
Other Factors |
NA |
Date |
Time |
Weather |
Leq-5min, dB(A) |
L-30min, dB(A) |
L10 -30min, dB(A) |
L90 -30min, dB(A) |
Free-field Correction L-30min, dB(A) |
Free-field Correction L10 -30min, dB(A) |
Free-field Correction L90 -30min, dB(A) |
|||||
Reading (1) |
Reading (2) |
Reading (3) |
Reading (4) |
Reading (5) |
Reading (6) |
|||||||||
29/5/2018 |
10:18-10:48 |
sunny |
67.9 |
71.1 |
66.2 |
68.3 |
68.7 |
67.8 |
68.6 |
70.5 |
55.4 |
71.6 |
73.5 |
58.4 |
30/5/2018 |
11:10-11:40 |
sunny |
68.6 |
67.5 |
69.1 |
68.4 |
68.8 |
67.3 |
68.3 |
70.4 |
56.5 |
71.3 |
73.4 |
59.5 |
31/5/2018 |
10:35-11:05 |
sunny |
69.2 |
68.6 |
67.1 |
68.9 |
68.6 |
68.6 |
68.5 |
72.0 |
55.9 |
71.5 |
75.0 |
58.9 |
1/6/2018 |
13:50-14:20 |
sunny |
66.3 |
65.4 |
69.6 |
65.1 |
69.2 |
69.1 |
67.8 |
69.9 |
54.9 |
70.8 |
72.9 |
57.9 |
2/6/2018 |
12:57-13:27 |
Fine |
68.6 |
67.8 |
69.0 |
68.3 |
68.5 |
69.3 |
68.6 |
70.8 |
56.3 |
71.6 |
73.8 |
59.3 |
3/6/2018 |
16:28-16:58 |
Fine |
69.5 |
68.2 |
68.3 |
69.7 |
68.8 |
69.4 |
69.0 |
71.2 |
55.8 |
72.0 |
74.2 |
58.8 |
4/6/2018 |
16:55-17:25 |
cloudy |
72.6 |
71.8 |
70.5 |
71.3 |
72.2 |
72.8 |
71.9 |
74.0 |
58.4 |
74.9 |
77.0 |
61.4 |
5/6/2018 |
13:34-14:04 |
cloudy |
69.4 |
71.1 |
71.5 |
72.3 |
70.4 |
70.6 |
71.0 |
73.0 |
61.6 |
74.0 |
76.0 |
64.6 |
6/6/2018 |
14:06-14:36 |
Cloudy |
71.5 |
69.3 |
68.8 |
70.4 |
71.0 |
69.6 |
70.2 |
72.4 |
59.4 |
73.2 |
75.4 |
62.4 |
7/6/2018 |
cancelled due to typhoon and the adverse weather |
|||||||||||||
8/6/2018 |
cancelled due to typhoon and the adverse weather |
|||||||||||||
9/6/2018 |
15:24-15:54 |
fine |
64.3 |
65.2 |
65.8 |
67.1 |
66.4 |
65.3 |
65.8 |
67.9 |
59.7 |
68.8 |
70.9 |
62.7 |
10/6/2018 |
15:25-15:55 |
Fine |
68.3 |
67.9 |
69.1 |
68.6 |
67.8 |
68.0 |
68.3 |
70.3 |
55.8 |
71.3 |
73.3 |
58.8 |
11/6/2018 |
14:49-15:19 |
fine |
67.7 |
65.2 |
69.2 |
66.5 |
67.5 |
67.3 |
67.4 |
70.0 |
54.1 |
70.4 |
73.0 |
57.1 |
12/6/2018 |
cancelled due to typhoon and the adverse weather |
|||||||||||||
13/6/2018 |
15:50-16:20 |
Fine |
68.3 |
68.1 |
68.9 |
67.5 |
67.8 |
67.1 |
68.0 |
71.6 |
55.7 |
71.0 |
74.6 |
58.7 |
14/6/2018 |
17:06-17:31 |
Fine |
70.4 |
66.2 |
70.6 |
69.6 |
68.4 |
61.0 |
68.6 |
72.6 |
53.5 |
71.6 |
75.6 |
56.5 |
Remarks: Free-field correction +3dB(A)
has been made for NSR24
NSR ID: |
NSR31 |
Baseline monitoring period: |
29/5/2018 to 14/6/2018 |
Parameter : |
Leq 30min, L10 30min ,L90 30min |
Major Site Activities |
No construction works were conducted in the vicinity during the monitoring period. |
Major dust source |
Nearby traffic and school activities |
Other Factors |
NA |
Date |
Time |
Weather |
Leq-5min, dB(A) |
L-30min, dB(A) |
L10 -30min, dB(A) |
L90 -30min, dB(A) |
|||||
Reading (1) |
Reading (2) |
Reading (3) |
Reading (4) |
Reading (5) |
Reading (6) |
||||||
29/5/2018 |
11:26-11:56 |
sunny |
58.4 |
58.8 |
59.9 |
60.0 |
60.3 |
58.2 |
59.3 |
63.3 |
52.5 |
30/5/2018 |
12:16-13:46 |
sunny |
58.8 |
54.7 |
57.3 |
60.9 |
58.7 |
58.1 |
58.5 |
60.7 |
53.7 |
31/5/2018 |
12:13-12:43 |
sunny |
56.7 |
58.2 |
56.5 |
57.2 |
57.4 |
59.5 |
57.7 |
61.1 |
52.1 |
1/6/2018 |
12:06-12:36 |
sunny |
59.9 |
61.6 |
59.3 |
60.1 |
58.2 |
59.3 |
59.9 |
62.8 |
55.8 |
2/6/2018 |
11:44-12:34 |
Fine |
63.2 |
60.8 |
59.7 |
59.4 |
60.3 |
59.8 |
60.7 |
62.4 |
55.5 |
3/6/2018 |
15:19-15:49 |
Fine |
59.7 |
58.5 |
57.9 |
57.3 |
59.0 |
58.8 |
58.6 |
60.4 |
52.8 |
4/6/2018 |
14:29-14:59 |
cloudy |
67.9 |
68.3 |
69.9 |
69.1 |
69.4 |
69.6 |
69.1 |
72.2 |
60.5 |
5/6/2018 |
14:27-14:57 |
cloudy |
60.4 |
61.3 |
61.5 |
62.2 |
64.1 |
63.2 |
62.3 |
64.4 |
58.3 |
6/6/2018 |
15:14-15:44 |
Cloudy |
62.4 |
64.0 |
64.8 |
63.6 |
61.5 |
62.1 |
63.2 |
65.2 |
59.3 |
7/6/2018 |
cancelled due to typhoon and the adverse weather |
||||||||||
8/6/2018 |
cancelled due to typhoon and the adverse weather |
||||||||||
9/6/2018 |
16:22-16:52 |
fine |
58.8 |
57.5 |
57.9 |
58.4 |
58.6 |
57.6 |
58.2 |
60.0 |
53.6 |
10/6/2018 |
16:10-16:40 |
Fine |
59.1 |
57.9 |
58.3 |
58.7 |
57.8 |
59.3 |
58.6 |
60.1 |
52.7 |
11/6/2018 |
15:34-16:04 |
fine |
58.0 |
59.3 |
57.2 |
56.6 |
56.6 |
57.0 |
57.6 |
60.8 |
51.9 |
12/6/2018 |
cancelled due to typhoon and the adverse weather |
||||||||||
13/6/2018 |
16:27-16:57 |
Fine |
57.6 |
57.9 |
58.1 |
57.6 |
58.3 |
58.9 |
58.1 |
61.0 |
51.4 |
14/6/2018 |
16:04-16:34 |
Fine |
57.4 |
58.7 |
57.8 |
59.2 |
57.0 |
57.7 |
58.0 |
67.5 |
58.8 |