1.1.1
Environmental
Protection Department (hereafter referred as “EPD”) is the Project
Proponent for the Project
“Organic Waste Treatment
Facilities Phase 2” (hereafter referred as “the
Project”). The Project is a Designated Project to be implemented
under Environmental Permit No. EP-460/2013. The layout plan of the Project is shown in Appendix A.
1.1.2
AJA Joint Venture has
been awarded the EPD Contract No. EP/SP/86/15 “Organic Waste Treatment Facilities
Phase 2”. According to the Contract requirement,
AJA Joint Venture shall take over all the responsibility of the Environmental Permit No. EP-460/2013 for ease of management, therefore application for Further Environmental Permit was submitted by AJAJV to EPD on 10 September 2019 and Further Environmental Permit No. FEP-01/460/2013
was granted to AJAJV by EPD on 2 October 2019. This
baseline report also serves as the relevant EP submission for EP-460/2013.
1.1.3
Major works of
construction activities under the Project included:
(i)
Demolition the existing above ground
structures of the Sha Ling Livestock Waste Composting Plant (SLCP);
(ii)
Construction superstructure for an
administration building and enclosed waste reception area;
(iii)
Installation of treatment facilities
including waste pre-treatment equipment, digesters, biogas holding tanks,
composting, wastewater treatment, air treatment systems; and
(iv)
Facilities for biogas processing,
utilization and transmission;
1.1.4
Action-United
Environmental Services & Consulting (hereinafter
referred as “AUES”) has been commissioned by AJAJV as an Environmental
Team (hereinafter referred as “the ET”) to implement the Environmental Monitoring & Audit (EM&A) programmes in accordance with the approved EM&A Manual as well as
the associated duties.
1.1.5
As part of the EM&A programmes, baseline monitoring is required to be conducted prior to commencement of
construction works of the Project. The Environmental Monitoring
requirements are set out in the Approved EM&A Manual, only construction
noise was identified as the key issues during the construction phase of the
Project. Thus, baseline noise monitoring was conducted by the ET from 25 September 2019 to 8 October 2019 which was before the
commencement of construction of the Project on 3 December 2019. During the
baseline monitoring period, no construction activities under the Project or other
external influencing factors of significant concern such as construction
activities under the other Projects was observed.
1.1.6
This Baseline Monitoring Report presents the detailed baseline monitoring information including
project background, monitoring methodology and results, and Action/Limit (A/L)
Levels as setting in the EM&A Manual for subsequent use in the construction
phase of the Project.
1.2.1
The Baseline Monitoring Report is structured
into the following sections:-
Section 1 Introduction
Section 2 Summaries of Baseline
Monitoring Requirement.
Section 3 Baseline Monitoring
Methodology
Section 4 Baseline Monitoring
Results
Section 5 Conclusions and
Recommendations
2.1.1
According to the EM&A Manual requirement, only construction
noise monitoring is required during the construction phase of the Project. Other environmental monitoring parameter
such as air and water quality is not required during construction period.
2.1.2
Based on the EM&A Manual requirement, baseline noise monitoring
should be conducted prior to the commencement
of construction work under the Project. A summary of
the baseline monitoring requirement for construction noise as stipulated in the
EM&A Manual is presented below.
2.2.1
The
construction noise level should be measured in terms of the A-weighted
equivalent continuous sound pressure level (Leq).
Leq(30min) should be used as the
monitoring parameter between 0700 and 1900 hours during baseline monitoring
periods.
2.3.1
According to the EM&A Manual Section
4.2.3, there were four (4) noise sensitive receivers (NSR) (i.e. N1, N2,
N3 and N4) recommended for construction noise monitoring.
2.3.2
Site
visits were conducted by ET to identify the NSR. Since access to the two
designated location N2 (Village House No. 319 of Sha Ling) and N3 (Village
House No. 265 of Sha Ling) for noise monitoring was not granted by the house
owner, two alternative locations N2a (Village House No.
318 of Sha Ling) and N3a (Village House No. 261 of Sha Ling) were proposed to
carry out the baseline noise monitoring.
2.3.3
The details
of the designated monitoring location N2 & N3 and alternative monitoring
location N2a & N3a were summarized in Table 2-1 and showed in Appendix B.
Table 2-1 Distance between the original and
alternative station
|
Location ID
|
Location
|
Type of premises
|
Direction from construction site boundary
|
Slant distance from the construction site
boundary
|
|
Designated Location N2
|
Village House No. 319
|
Residential, Private
(Village Type Development)
|
North
|
92m
|
|
Alternative Location N2a
|
Village House No. 318
|
Residential, Private
(Village Type Development)
|
North
|
109m
|
|
Designated Location N3
|
Village House No. 265
|
Residential, Private
(Village Type Development)
|
Southwest
|
55m
|
|
Alternative Location N3a
|
Village House No. 261
|
Residential, Private
(Village Type Development)
|
Southwest
|
88m
|
2.3.4
The rationale
for choosing the abovementioned alternative monitoring location to carry out
noise monitoring are as follows:
Ÿ Alternative N2a and
N3a are noise sensitive receiver as defined in the under Annex 13 of EIAO-TM (Residential Uses);
Ÿ Alternative N2a and
N3a are located nearby recommend monitoring location N2 and N3 respectively. In addition, both alternative locations were close to the
major site activities and likely impacts by construction noise; and
Ÿ Alternative monitoring
N2a and N3a will have minimal disturbance to the occupants during monitoring.
2.3.5
A proposal
of alternative monitoring location with detailed justification was submitted
and the proposal was agreed by ER, IEC and EPD. Beside façade correction +3 dB(A) will be applied when noise monitoring is carried out
under free field condition noise monitoring, an additional
distance correction of +1 dB(A) and +3 dB(A) were proposed and will be applied
for alternative monitoring location N2a and N3a respectively due to the difference of slant distance between the
designated monitoring locations (N2 and N3) and the alternative monitoring
locations (N2a and N3a).
2.3.6
The noise monitoring locations for baseline noise monitoring are listed
in Table
2-2 and the photo record was shown in Appendix B.
Table 2-2 Baseline
Noise Monitoring Locations
|
Location
ID
|
Location
|
Remark
|
|
N1
|
Village House No.
308, Sha Ling
|
The designated
monitoring location
|
|
N2a
|
Village House No.
318, Sha Ling
|
Alternative location of the
designated location N2
|
|
N3a
|
Village House No.
261, Sha Ling
|
Alternative location of the
designated location N3
|
|
N4
|
Village House in Sha
Ling as located the Project south-east direction
|
The designated
monitoring location
|
2.4.1
The requirements of baseline noise monitoring
are stipulated in Sections 4.2.4 of
the approved EM&A Manual and presented
as follows.
2.4.2
One set of Leq (30 minutes)
noise measurement between 0700 and 1900 hours should be carried out daily for a
period of at least two weeks for the baseline noise monitoring as required in EM&A
Manual. However, in order to
obtain a more comprehensive baseline database, two more noise measurement
was added and overall three sets of Leq (30 minutes) noise measurement were conducted daily
for more comprehensive baseline database and presented in this report.
2.5.1
Sound level meter in compliance with the International Electrotechnical Commission Publications 651: 1979 (Type 1)
and 804: 1985 (Type 1) specifications shall be used for carrying out the noise
monitoring. The sound level meter
shall be checked using an acoustic calibrator. The wind speed shall be checked with a
portable wind speed meter capable of measuring the wind speed in ms-1. Noise monitoring equipment used for
baseline monitoring is listed in Table 2-3.
Table 2-3 Construction
Noise Monitoring Equipment
|
Equipment
|
Model
|
|
Integrating Sound Level Meter
|
B&K
Type 2238 / Rion NL-52
|
|
Calibrator
|
B&K
Type 4231 / Rion NC-75
|
|
Portable Wind Speed Indicator
|
Model
8908 AZ Instrument Wind Speed Indicator
|
2.5.2
Sound level meters listed above comply with the International Electrotechnical
Commission Publications 651: 1979 (Type 1) and 804: 1985 (Type 1) specifications, as recommended in TM issued
under the NCO. The acoustic
calibrator and sound level meter used baseline monitoring was calibrated
yearly.
2.6.1
All the obtained background noise measurement data during baseline
monitoring will be used as a reference in case of any Action / Limit levels exceedance was recorded in
construction period. The Action and Limit (A/L) Levels of construction noise stated
in the EM&A Manual Section 4.2.6 is shown in Table
2-4.
Table 2-4 Action
and Limit Levels of Construction Noise
|
Time Period
|
Action Level
|
Limit Level
|
|
0700-1900
hours on normal weekdays
|
When one documented complaint
is received
|
(*)75dB(A)
|
Note: (*) Reduces
to 70 dB(A) for schools and 65 dB(A) during the school
examination periods.
Remarks: If works
are to be carried out during restricted hours (1900 to 0700 on normal weekdays
or at any time on a general holiday including Sunday), the conditions
stipulated in the construction noise permit issued by the EPD
have to be followed.
3.1.1
The
baseline construction noise monitoring was conducted prior commencement of the
Project. During the baseline monitoring period, no construction
activities of this project or the other external influencing factors of
significant concern such as construction activities under the other Projects
was observed by the ET.
3.1.2
Baseline noise monitoring was conducted at the monitoring location stated in Table
2-1 for two consecutive
weeks from 25 September 2019 to 8 October 2019.
3.1.3
All the monitoring equipment stated in Table 2-2 was used
for the baseline monitoring. All the sound level meters and calibrators were calibrated by a
calibration & testing laboratory called Sun Creation Engineering Limited
and the valid calibration certificates for the sound level meters and calibrators
were provided in Appendix C.
3.1.4
All the noise meter used are in compliance with the detection
limit set in International Electrotechnical
Commission Publications 651: 1979 (Type 1) and 804: 1985 (Type 1)
specifications. As a QA/QC process, the sound level meter was checked using an acoustic calibrator generating a
known sound pressure level at a known frequency and the calibration
level from before and after the noise measurement was within 1.0 dB.
3.2.1
The noise measurement was performed with the meter set to FAST
response and on the A-weighted equivalent continuous sound pressure level (Leq). Leq(30mins)
in six consecutive Leq(5min) measurement are used as
the monitoring parameter throughout the baseline monitoring period. Restricted hours is 1900 to 0700 on
normal weekdays or at any time on a general holiday including Sunday.
3.2.2
During the baseline monitoring, the sound level meter was mounted
on a tripod at a height of about 1.2 m and placed at the monitoring locations
and oriented such that the microphone was pointed to the site with the
microphone facing perpendicular to the line of sight. The windshield was fitted
for the measurement. For the
baseline noise monitoring, N1, N2a, N3a, and N4 were conducted in a free-field situation i.e.
at least 3.5m distances away from reflective surfaces of the adjacent buildings
or walls.
3.2.3
Prior baseline noise measurement, the accuracy of the sound level
meter was checked using an acoustic calibrator generating a known sound
pressure level at a known frequency.
The calibration from before and after the noise measurement agrees to
within 1.0dB such ±0.5dB
of the known sound pressure level.
3.2.4
During the noise measurement, a portable wind speed meter was used
to check wind speed (m/s). No noise
monitoring was conducted when wind speed was exceeding 5m/s or gusts exceeding
10m/s. Also, no noise measurement was
conducted in the presence of fog and rain.
3.3.1
The baseline monitoring data were handled by the
ET’s in-house data
recording and management system.
3.3.2
The monitoring data recorded in the instruments were downloaded
directly from sound level meter at the end of each monitoring day. The downloaded monitoring data were
input into a computerized database properly maintained by the ET.
4.1.1
The baseline monitoring schedule is enclosed in Appendix
D. During the baseline
monitoring period, no construction activities under the Project or other
external influencing factors of significant concern such as construction
activities under the other Projects was observed.
4.1.2
The baseline noise monitoring was undertaken at N1, N2a, N3a and N4
from 25
September 2019 to 8 October 2019. In order to obtain a more comprehensive
baseline database, three sets of Leq
(30 minutes) noise measurement were conducted daily. All
the three noise measurement was carried out randomly throughout 0700 – 1900 of
the monitoring day and no specified measurement period was selected. During the noise measurement, no noise measurement was carried
out under rain and in the presence of fog.
Furthermore, a portable wind speed meter was used to check wind speed to ensure no wind speed was exceeding 5m/sec or gusts exceeding 10m/sec. The detailed measurement data, graphical
plot and field data sheet are shown in Appendix E, Appendix F and in Appendix
G respectively. Each monitoring station background noise summary is listed
in Table
4-5.
Table
4-1 Noise
Monitoring Results of N1 – Village House No. 308,
Sha Ling
|
Date
|
Start
Time
|
End
Time
|
L10
Range
Leq5min,
dB(A)
|
L90
Range
Leq5min,
dB(A)
|
Leq30min,
dB(A)
|
Façade Corrected
Leq30min, dB(A)
|
|
25-Sep-19
|
10:16
|
10:46
|
43.5-46.5
|
36.7-37.8
|
43.3
|
46.3
|
|
14:08
|
14:38
|
44.5-48.1
|
37.2-38.8
|
42.9
|
45.9
|
|
17:30
|
18:00
|
41.9-49.6
|
34.3-35.9
|
42.3
|
45.3
|
|
26-Sep-19
|
10:38
|
11:08
|
43.0 -45.2
|
37.0-38.3
|
57.1
|
60.1
|
|
14:01
|
14:31
|
43.8-57.6
|
37.2-38.9
|
59.0
|
62.0
|
|
17:16
|
17:46
|
40.8-43.2
|
35.1-37.2
|
42.4
|
45.4
|
|
27-Sep-19
|
10:36
|
11:06
|
47.5-50.0
|
40.3-41.6
|
60.5
|
63.5
|
|
13:03
|
13:33
|
42.4-48.7
|
38.1-40.1
|
57.1
|
60.1
|
|
16:14
|
16:44
|
43.4-49.3
|
37.6-38.9
|
60.9
|
63.9
|
|
28-Sep-19
|
10:31
|
11:01
|
45.0-65.8
|
39.2-41.6
|
63.5
|
66.5
|
|
13:16
|
13:46
|
45.2-47.0
|
37.3-39.3
|
59.6
|
62.6
|
|
16:24
|
16:54
|
46.7-50.8
|
32.2-34.8
|
63.1
|
66.1
|
|
29-Sep-19#
|
10:43
|
11:13
|
45.2-66.1
|
36.4-41.3
|
62.4
|
65.4
|
|
12:43
|
13:13
|
43.0-46.5
|
36.1-37.9
|
61.2
|
64.2
|
|
15:50
|
16:20
|
45.1-48.5
|
38.0-40.2
|
59.3
|
62.3
|
|
30-Sep-19
|
10:15
|
10:45
|
44.0-50.4
|
38.1-40.9
|
62.9
|
65.9
|
|
13:10
|
13:40
|
46.2-78.2
|
40.4-42.5
|
68.0
|
71.0*
|
|
16:16
|
16:46
|
46.8-48.8
|
38.1-39.5
|
63.6
|
66.6
|
|
1-Oct-19#
|
10:38
|
11:08
|
46.3-48.6
|
36.6-41.6
|
62.3
|
65.3
|
|
12:32
|
13:02
|
43.4-48.1
|
37.2-39.2
|
64.1
|
67.1
|
|
15:37
|
16:07
|
43.5-45.1
|
36.1-37.2
|
53.2
|
56.2
|
|
2-Oct-19
|
10:47
|
11:17
|
44.8-47.4
|
39.2-40.7
|
59.4
|
62.4
|
|
13:21
|
13:51
|
44.2-50.7
|
34.8-42.9
|
48.9
|
51.9
|
|
16:31
|
17:01
|
45.4-47.3
|
36.9-41.5
|
63.6
|
66.6
|
|
3-Oct-19
|
10:37
|
11:07
|
45.3-48.1
|
39.5-42.8
|
65.1
|
68.1
|
|
13:12
|
13:42
|
44.2-48.6
|
39.5-42.3
|
61.5
|
64.5
|
|
16:19
|
16:49
|
44.3-47.4
|
36.6-39.4
|
61.5
|
64.5
|
|
4-Oct-19
|
10:28
|
10:58
|
44.1-46.5
|
39.1-41.1
|
47.0
|
50.0
|
|
12:52
|
13:22
|
43.1-56.4
|
36.0-42.8
|
48.0
|
51.0
|
|
16:03
|
16:33
|
44.0-47.6
|
39.0-40.5
|
62.0
|
65.0
|
|
5-Oct-19
|
10:45
|
11:15
|
50.5-54.5
|
36.7-40.8
|
52.6
|
55.6
|
|
13:26
|
13:56
|
42.4-46.0
|
37.5-39.8
|
60.2
|
63.2
|
|
16:33
|
17:03
|
46.5-49.9
|
39.2-41.5
|
50.6
|
53.6
|
|
6-Oct-19#
|
10:36
|
11:06
|
46.1-48.4
|
36.5-37.7
|
59.6
|
62.6
|
|
12:31
|
13:01
|
43.3-45.2
|
37.1-38.6
|
61.0
|
64.0
|
|
15:37
|
16:07
|
43.0-45.9
|
37.2-38.8
|
60.8
|
63.8
|
|
7-Oct-19#
|
10:19
|
10:49
|
46.0-58.5
|
39.5-45.5
|
51.2
|
54.2
|
|
15:41
|
16:11
|
40.0-66.0
|
35.0-37.0
|
55.0
|
58.0
|
|
16:13
|
16:43
|
41.0-69.5
|
36.5-39.5
|
58.2
|
61.2
|
|
8-Oct-19
|
10:41
|
11:11
|
45.6-48.8
|
38.5-41.6
|
60.5
|
63.5
|
|
13:23
|
13:53
|
44.8-50.0
|
40.2-42.4
|
51.3
|
54.3
|
|
16:35
|
17:05
|
44.6-47.7
|
38.1-39.5
|
50.6
|
53.6
|
Note: Sound level meter set at monitoring
stations is made free-field measurement, façade correction (+3dB(A))
has added according to acoustical principles and EPD guidelines
*High noise
level recorded due to dog barking
Grey cells
with # - Monitoring events during restricted hours on Sunday or Public Holiday
Table
4-2 Noise
Monitoring Results of N2a – Village House No. 318,
Sha Ling
|
Date
|
Start
Time
|
End
Time
|
L10
Range
Leq5min,
dB(A)
|
L90
Range
Leq5min,
dB(A)
|
Leq30min,
dB(A)
|
Distance
& Façade Corrected Leq30min, dB(A)
|
|
25-Sep-19
|
10:58
|
11:28
|
45.1-83.3
|
39.5-42.2
|
70.6
|
74.6*
|
|
14:48
|
15:18
|
43.3-44.9
|
37.1-38.3
|
59.1
|
63.1
|
|
16:52
|
17:22
|
43.0-45.7
|
36.6-38.0
|
57.3
|
61.3
|
|
26-Sep-19
|
10:02
|
10:32
|
42.5-45.7
|
36.2-37.5
|
42.7
|
46.7
|
|
14:37
|
15:07
|
40.7-50.1
|
34.4-35.9
|
51.9
|
55.9
|
|
16:40
|
17:10
|
41.2-43.4
|
35.1-36.3
|
40.7
|
44.7
|
|
27-Sep-19
|
9:55
|
10:25
|
42.1-43.6
|
35.1-36.8
|
41.3
|
45.3
|
|
13:43
|
14:13
|
47.0-55.5
|
35.5-40.8
|
51.5
|
55.5
|
|
15:38
|
16:08
|
46.0-50.5
|
34.1-35.2
|
41.2
|
45.2
|
|
28-Sep-19
|
9:54
|
10:24
|
41.1-43.7
|
35.6-38.2
|
42.6
|
46.6
|
|
13:52
|
14:22
|
41.2-44.2
|
35.4-37.9
|
41.9
|
45.9
|
|
15:47
|
16:17
|
40.1-46.0
|
34.6-35.8
|
50.2
|
54.2
|
|
29-Sep-19#
|
10:04
|
10:34
|
48.0-59.2
|
40.2-42.4
|
50.1
|
54.1
|
|
13:19
|
13:49
|
46.6-53.8
|
34.0-36.5
|
52.7
|
56.7
|
|
15:14
|
15:44
|
42.8-43.9
|
35.4-36.5
|
49.5
|
53.5
|
|
30-Sep-19
|
9:39
|
10:09
|
41.9-45.8
|
35.4-37.2
|
41.9
|
45.9
|
|
13:46
|
14:16
|
42.1-45.6
|
36.0-37.5
|
45.8
|
49.8
|
|
15:40
|
16:10
|
46.2-48.7
|
35.0-36.7
|
47.5
|
51.5
|
|
1-Oct-19#
|
10:02
|
10:32
|
42.5-46.8
|
35.1-37.6
|
45.5
|
49.5
|
|
13:07
|
13:37
|
46.6-49.9
|
34.1-36.9
|
45.9
|
49.9
|
|
15:02
|
15:32
|
49.6-52.2
|
35.5-36.5
|
48.8
|
52.8
|
|
2-Oct-19
|
10:09
|
10:39
|
50.0-54.5
|
38.4-42.9
|
52.8
|
56.8
|
|
14:00
|
14:30
|
62.6-63.1
|
61.8-62.8
|
63.3
|
67.3
|
|
15:55
|
16:25
|
44.5-50.2
|
36.0-38.7
|
47.8
|
51.8
|
|
3-Oct-19
|
10:01
|
10:31
|
48.3-51.2
|
38.4-41.2
|
44.4
|
48.4
|
|
13:50
|
14:20
|
46.3-55.5
|
35.5-37.6
|
51.7
|
55.7
|
|
15:43
|
16:13
|
44.3-50.5
|
38.2-42.5
|
54.8
|
58.8
|
|
4-Oct-19
|
9:50
|
10:20
|
42.8-47.1
|
36.3-38.2
|
43.1
|
47.1
|
|
13:20
|
13:50
|
42.2-45.3
|
36.1-37.3
|
41.2
|
45.2
|
|
15:26
|
15:56
|
41.0-43.6
|
35.0-36.5
|
42.0
|
46.0
|
|
5-Oct-19
|
10:08
|
10:38
|
45.2-48.6
|
35.2-38.3
|
46.3
|
50.3
|
|
14:02
|
14:32
|
41.0-43.5
|
35.3-36.6
|
42.1
|
46.1
|
|
15:57
|
16:27
|
42.6-45.3
|
36.1-37.2
|
59.1
|
63.1
|
|
6-Oct-19#
|
9:59
|
10:29
|
46.8-50.5
|
40.3-42.4
|
45.4
|
49.4
|
|
13:07
|
13:37
|
42.0-44.6
|
34.0-35.6
|
43.1
|
47.1
|
|
15:32
|
16:02
|
42.2-44.3
|
34.6-36.4
|
42.3
|
46.3
|
|
7-Oct-19#
|
9:42
|
10:12
|
43.5-65.0
|
38.0-41.5
|
54.0
|
58.0
|
|
14:30
|
15:00
|
43.5-65.5
|
38.5-41.5
|
54.0
|
58.0
|
|
15:01
|
15:31
|
44.5-68.5
|
38.0-41.0
|
53.4
|
57.4
|
|
8-Oct-19
|
10:03
|
10:33
|
40.4-48.3
|
34.2-35.6
|
46.6
|
50.6
|
|
14:04
|
14:34
|
42.5-46.0
|
36.0-38.7
|
43.1
|
47.1
|
|
15:59
|
16:29
|
40.7-55.5
|
34.1-37.1
|
45.1
|
49.1
|
Note: Sound level meter set at monitoring
stations is made free-field measurement, façade correction (+3dB(A))
has added according to acoustical principles and EPD guidelines
A
distance correction of +1 dB(A) was applied for N2a
*High noise level
recorded due to dog barking
Grey cells
with # - Monitoring events during restricted hours on Sunday or Public Holiday
Table
4-3 Noise
Monitoring Results of N3a – Village House No. 261,
Sha Ling
|
Date
|
Start
Time
|
End
Time
|
L10
Range
Leq5min,
dB(A)
|
L90
Range
Leq5min,
dB(A)
|
Leq30min,
dB(A)
|
Distance
& Façade Corrected Leq30min, dB(A)
|
|
25-Sep-19
|
9:32
|
10:02
|
39.0-64.0
|
33.7-35.8
|
65.2
|
71.2
|
|
13:24
|
13:54
|
40.8-52.2
|
36.2-38.4
|
64.4
|
70.4
|
|
18:13
|
18:43
|
46.7-61.2
|
32.7-34.8
|
66.5
|
72.5
|
|
26-Sep-19
|
11:20
|
11:50
|
49.4-52.8
|
38.1-39.5
|
59.7
|
65.7
|
|
13:17
|
13:47
|
51.1-54.5
|
38.1-40.0
|
49.5
|
55.5
|
|
17:57
|
18:26
|
43.5-60.5
|
32.8-35.2
|
65.2
|
71.2
|
|
27-Sep-19
|
11:19
|
11:49
|
53.0-59.2
|
37.3-41.3
|
64.6
|
70.6
|
|
11:50
|
12:20
|
51.4-65.9
|
35.9-38.8
|
61.8
|
67.8
|
|
16:57
|
17:27
|
46.4-55.8
|
32.8-34.9
|
62.6
|
68.6
|
|
28-Sep-19
|
11:12
|
11:42
|
50.5-54.4
|
37.0-38.2
|
61.2
|
67.2
|
|
11:44
|
12:14
|
51.6-61.6
|
37.2-38.9
|
65.1
|
71.1
|
|
17:07
|
17:37
|
40.8-43.6
|
32.1-35.1
|
41.8
|
47.8
|
|
29-Sep-19#
|
11:27
|
11:57
|
48.2-52.1
|
30.8-32.4
|
59.0
|
65.0
|
|
11:59
|
12:29
|
44.5-51.9
|
29.1-31.3
|
62.1
|
68.1
|
|
16:31
|
17:01
|
44.8-46.5
|
29.0-30.6
|
42.9
|
48.9
|
|
30-Sep-19
|
10:59
|
11:29
|
51.3-62.5
|
38.0-40.5
|
60.9
|
66.9
|
|
11:31
|
12:01
|
51.5-69.9
|
38.0-39.6
|
65.6
|
71.6
|
|
16:57
|
17:27
|
46.5-59.6
|
32.0-34.5
|
65.8
|
71.8
|
|
1-Oct-19#
|
11:19
|
11:49
|
48.6-51.2
|
30.6-34.8
|
57.9
|
63.9
|
|
11:50
|
12:20
|
43.5-48.0
|
29.3-34.6
|
42.8
|
48.8
|
|
16:18
|
16:48
|
45.0-50.0
|
29.6-31.3
|
63.5
|
69.5
|
|
2-Oct-19
|
11:30
|
12:00
|
47.9-52.8
|
34.0-37.8
|
47.5
|
53.5
|
|
12:02
|
12:32
|
44.4-51.8
|
34.8-39.2
|
46.5
|
52.5
|
|
17:12
|
17:42
|
46.5-49.5
|
32.3-34.6
|
60.1
|
66.1
|
|
3-Oct-19
|
11:21
|
11:51
|
44.2-53.2
|
37.1-40.0
|
58.7
|
64.7
|
|
11:53
|
12:23
|
46.6-49.4
|
36.1-38.6
|
63.0
|
69.0
|
|
17:01
|
17:31
|
44.7-51.5
|
32.2-34.3
|
46.4
|
52.4
|
|
4-Oct-19
|
11:11
|
11:41
|
53.0-80.9
|
32.6-75.2
|
76.8
|
82.8*
|
|
11:41
|
12:11
|
52.0-80.6
|
43.4-75.3
|
75.4
|
81.4*
|
|
16:44
|
17:14
|
46.4-60.8
|
32.0-34.0
|
66.6
|
72.6
|
|
5-Oct-19
|
11:27
|
11:57
|
47.2-52.2
|
34.2-36.6
|
62.6
|
68.6
|
|
11:58
|
12:28
|
44.9-50.6
|
34.5-35.6
|
46.6
|
52.6
|
|
17:14
|
17:44
|
49.2-62.4
|
31.1-34.5
|
62.1
|
68.1
|
|
6-Oct-19#
|
11:19
|
11:49
|
44.0-70.6
|
32.0-35.1
|
64.1
|
70.1
|
|
11:50
|
12:20
|
44.3-52.1
|
30.5-32.3
|
57.6
|
63.6
|
|
16:18
|
16:48
|
46.3-51.5
|
30.0-32.0
|
59.4
|
65.4
|
|
7-Oct-19#
|
11:10
|
11:40
|
43.0-66.5
|
40.0-42.5
|
56.6
|
62.6
|
|
16:51
|
17:21
|
41.5-67.5
|
38.0-39.5
|
55.9
|
61.9
|
|
17:24
|
17:54
|
42.0-63.5
|
37.0-38.5
|
51.9
|
57.9
|
|
8-Oct-19
|
11:22
|
11:52
|
45.8-52.2
|
36.0-37.9
|
64.7
|
70.7
|
|
11:54
|
12:24
|
47.3-52.4
|
36.2-37.6
|
47.7
|
53.7
|
|
17:18
|
17:48
|
51.2-61.4
|
35.9-37.7
|
72.4
|
78.4*
|
Note: Sound level meter set at monitoring stations
is made free-field measurement, façade correction (+3dB(A))
has added according to acoustical principles and EPD guidelines
A distance
correction of +3 dB(A) was applied for N3a
*High noise level recorded
due to dog barking
Grey cells
with # - Monitoring events during restricted hours on Sunday or Public Holiday
Table 4-4 Noise
Monitoring Results of
N4 – Village House in
Sha Ling as located the Project south-east direction
|
Date
|
Start
Time
|
End
Time
|
L10
Range
Leq5min,
dB(A)
|
L90
Range
Leq5min,
dB(A)
|
Leq30min,
dB(A)
|
Façade Corrected
Leq30min, dB(A)
|
|
25-Sep-19
|
11:46
|
12:16
|
49.0-86.8
|
32.9-36.7
|
73.4
|
76.4*
|
|
15:32
|
16:02
|
51.6-55.8
|
38.2-38.7
|
66.1
|
69.1
|
|
16:07
|
16:37
|
49.7-61.0
|
38.5-39.1
|
63.8
|
66.8
|
|
26-Sep-19
|
9:22
|
9:52
|
51.6-54.8
|
37.5-38.5
|
58.2
|
61.2
|
|
15:18
|
15:48
|
43.9-56.6
|
32.6-34.4
|
54.9
|
57.9
|
|
15:50
|
16:20
|
42.7-48.5
|
33.6-35.5
|
55.3
|
58.3
|
|
27-Sep-19
|
9:08
|
9:38
|
40.5-46.7
|
33.5-36.4
|
57.2
|
60.2
|
|
14:25
|
14:55
|
39.1-43.3
|
32.6-36.6
|
40.7
|
43.7
|
|
14:56
|
15:26
|
41.8-45.2
|
33.5-36.0
|
44.7
|
47.7
|
|
28-Sep-19
|
9:12
|
9:42
|
40.9-45.2
|
33.0-36.3
|
59.0
|
62.0
|
|
14:33
|
15:03
|
41.0-42.5
|
33.4-34.5
|
42.1
|
45.1
|
|
15:05
|
15:35
|
42.0-45.4
|
33.6-34.6
|
41.6
|
44.6
|
|
29-Sep-19#
|
9:17
|
9:47
|
36.6-57.9
|
31.1-31.1
|
57.8
|
60.8
|
|
14:00
|
14:30
|
42.0-48.2
|
33.3-33.3
|
63.7
|
66.7
|
|
14:31
|
15:01
|
34.2-45.2
|
33.2-33.2
|
57.9
|
60.9
|
|
30-Sep-19
|
9:09
|
9:39
|
42.0-44.2
|
33.5-33.5
|
41.9
|
44.9
|
|
14:28
|
14:58
|
41.0-44.2
|
34.0-34.0
|
61.5
|
64.5
|
|
14:59
|
15:29
|
43.3-46.3
|
33.5-33.5
|
58.5
|
61.5
|
|
1-Oct-19#
|
9:20
|
9:50
|
36.4-58.2
|
31.0-31.0
|
62.4
|
65.4
|
|
13:49
|
14:19
|
41.0-46.5
|
32.6-32.6
|
65.8
|
68.8
|
|
14:20
|
14:50
|
36.7-52.8
|
32.1-32.1
|
59.0
|
62.0
|
|
2-Oct-19
|
9:24
|
9:54
|
43.5-46.7
|
33.1-33.1
|
58.8
|
61.8
|
|
14:42
|
15:12
|
41.4-50.5
|
34.0-34.0
|
63.3
|
66.3
|
|
15:13
|
15:43
|
40.2-50.5
|
33.2-33.2
|
62.0
|
65.0
|
|
3-Oct-19
|
9:18
|
9:48
|
44.5-47.6
|
33.3-33.3
|
62.5
|
65.5
|
|
14:31
|
15:01
|
43.2-52.9
|
32.0-32.0
|
59.4
|
62.4
|
|
15:02
|
15:32
|
42.6-46.5
|
32.4-32.4
|
66.1
|
69.1
|
|
4-Oct-19
|
9:07
|
9:37
|
41.9-61.5
|
34.3-34.3
|
65.4
|
68.4
|
|
14:12
|
14:42
|
41.7-57.1
|
34.5-34.5
|
62.0
|
65.0
|
|
14:44
|
15:14
|
41.2-44.2
|
34.4-34.4
|
57.6
|
60.6
|
|
5-Oct-19
|
9:25
|
9:55
|
40.5-46.1
|
34.4-34.4
|
61.2
|
64.2
|
|
14:43
|
15:13
|
49.0-54.3
|
37.0-37.0
|
68.0
|
71.0
|
|
15:14
|
15:44
|
48.4-56.5
|
37.2-37.2
|
63.2
|
66.2
|
|
6-Oct-19#
|
9:15
|
9:45
|
40.3-47.0
|
33.5-33.5
|
62.6
|
65.6
|
|
13:49
|
14:19
|
36.5-40.6
|
31.0-31.0
|
66.7
|
69.7
|
|
14:21
|
14:51
|
36.0-38.1
|
32.2-32.2
|
60.6
|
63.6
|
|
7-Oct-19#
|
9:07
|
9:37
|
50.5-70.5
|
36.5-36.5
|
61.4
|
64.4
|
|
13:13
|
13:43
|
41.0-64.5
|
37.0-37.0
|
52.8
|
55.8
|
|
13:45
|
14:15
|
42.0-60.0
|
37.5-37.5
|
51.9
|
54.9
|
|
8-Oct-19
|
9:19
|
9:49
|
43.2-48.9
|
34.0-34.0
|
57.8
|
60.8
|
|
14:46
|
15:16
|
43.6-47.8
|
33.4-33.4
|
57.1
|
60.1
|
|
15:18
|
15:48
|
44.3-48.5
|
33.7-33.7
|
59.3
|
62.3
|
Note: Sound level meter set at monitoring
stations is made free-field measurement, façade correction (+3dB(A))
has added according to acoustical principles and EPD guidelines
*High noise
level recorded due to dog barking
Grey cells
with # - Monitoring events during restricted hours on Sunday or Public Holiday
4.1.3
Based on above tables, each monitoring station background noise summary
is listed in Table 4-5.
Table 4-5 Summaries of
Noise Monitoring Results
|
Station
ID
|
Time
Period
|
Results, dB(A)
|
|
Mean
|
Max
|
Min
|
|
N1
|
Normal Daytime 0700-1900 – Leq(30min)
|
63.5
|
71.0
|
45.3
|
|
Restricted Hours 0700-1900
Sunday/holiday – Leq(30min)
|
63.3
|
67.1
|
54.2
|
|
N2a
|
Normal Daytime 0700-1900 – Leq(30min)
|
61.6
|
74.6
|
44.7
|
|
Restricted Hours 0700-1900
Sunday/holiday – Leq(30min)
|
54.4
|
58.0
|
46.3
|
|
N3a
|
Normal Daytime 0700-1900 – Leq(30min)
|
73.0
|
82.8
|
47.8
|
|
Restricted Hours 0700-1900
Sunday/holiday – Leq(30min)
|
65.3
|
70.1
|
48.8
|
|
N4
|
Normal Daytime 0700-1900 – Leq(30min)
|
66.2
|
76.4
|
43.7
|
|
Restricted Hours 0700-1900
Sunday/holiday – Leq(30min)
|
65.1
|
69.7
|
54.9
|
4.1.4
Although no construction activities under the project were observed during the baseline
monitoring period but dog barking was encountered during the baseline monitoring since all
the monitoring stations located nearby Village house in Sha Ling. Some
extremely high noise level such as N1 on 30th
September 2019 at 13:10, N2a on 25th September 2019 at 10:58, N3a on
on 8th October 2019 at 17:18, and N4 on 25th
September 2019 at 11:46 were recorded due to dog barking. In addition, two high noise measurement
were recorded at N3a on 4th October 2019 at 11:11
& 11:41 due to unloading of goods by villagers.
5.1.1
The
baseline noise monitoring was carried out during the period between 25 September
2019 and 8 October 2019. During the baseline monitoring period, no
construction activities of this project or other external influencing factors of
significant concern such as construction activities under the other Projects
was observed by the ET. Moreover, no noise measurement was carried out in the
presence of rain and fog.
5.1.2
As stipulated in the EM&A Manual, the construction noise action
and limit level is follows:
Table 5-1 Action and Limit Levels of Construction Noise
|
Monitoring Location
|
Action Level
|
Limit Level
|
|
Time Period: 0700-1900 hours on normal weekdays
|
|
N1,N2a, N3a, N4
|
When one or more documented
complaints are received
|
75 dB(A)
|
|
Note:
1
If works
are to be carried out during restricted hours, the conditions stipulated in
the construction noise permit issued by the NCA
have to be followed.
2
70dB(A) for schools
and 65dB(A) during school examination periods
3
The alternative
monitoring location N2a and N3a are proposed for both baseline and impact
monitoring
|
5.1.3
No
revision is considered required to be included in the EM&A Manual.
5.2
Recommendations
5.2.1
If the changes in baseline conditions are evident, the
environmental performance criteria should be re-established by agreement of the
Engineer and IEC and submitted to EPD endorse.
