Executive
summary
Apex Testing & Certification Limited (Apex) was commissioned to
undertake the Environmental Team (ET) services (including environmental
monitoring and audit (EM&A)) for the construction activities in Zone 2A at
WKCD, consisting of Foundation, Excavation and Lateral Support Works for
Integrated Basement and Underground Road (Contract No.: GW/2020/05/073).
The construction works and EM&A programme for Zone 2A commenced on 3
October 2020.
The Project Proponent is the West Kowloon Cultural District Authority (WKCDA).
The overall works for the WKCD fall under two separate
categories of Designated Project (DP) of the Environmental Impact Assessment
Ordinance (EIAO), namely an “engineering feasibility study of urban development
projects with a study area covering more than 20 ha or involving a total
population of more than 100 000” (Item 1 of Schedule 3) and “an underpass more
than 100m in length under the built areas” (Item A.9, Part I, Schedule 2). An
Environmental Permit No. EP-453/2013/B (EP) was issued with respect to the
“Underpass Road and Austin Road Flyover Serving the West Kowloon Cultural
District” which specifically includes the abovementioned category of DP under
Item A.9, Part I, Schedule 2 of the EIAO.
This Monthly EM&A Report presents the
monitoring works at Zone 2A from
3 to 31 October 2020.
Exceedance of Action and Limit Levels
There was no breach of Action or Limit levels for Air Quality
(1-hour TSP and 24-hour TSP) and Noise in this reporting month.
Implementation of
Mitigation Measures
Construction phase weekly site inspections
were carried out on 8, 15, 22 and 29 October 2020 for
Foundation, Excavation and Lateral Support Works in Zone 2A to confirm the implementation measures undertaken by the Contractors
in the reporting month. The outcomes are presented in Section 4 and the status
of implementation of mitigation measures in the site is shown in Appendix J.
Landscape and visual impact inspections were conducted as part of
the abovementioned weekly site inspections during the reporting month. No adverse
comment on landscape and visual aspects was made during these inspections.
Record of Complaints
No environmental complaints were recorded in the reporting month
Record of Notifications of Summons and Successful Prosecutions
No notifications of summons and successful prosecutions were
recorded in the reporting month.
Future Key Issues
The major site works for Zone 2A scheduled to be commissioned in the
coming month include:
●
Grouting Curtain Works (Trial 1
& Trial 2)
●
Bored Pile Works
–
Bored Pile Works (Predrilling)
–
Bored Pile Construction
●
ELS (Stage 1)
–
Grouting Works
Potential environmental impacts due to the construction activities,
including air, noise, water quality, waste, landscape and visual, will be
monitored or reviewed. The recommended environmental mitigation measures shall
be implemented on site and regular inspections as required will be carried out
to ensure that the environmental conditions are acceptable.
Apex Testing & Certification Limited (Apex) was commissioned to
undertake the Environmental Team (ET) services (including environmental
monitoring and audit (EM&A)) for the construction activities in Zone 2A at
WKCD, consisting of Foundation, Excavation and Lateral Support Works for Integrated
Basement and Underground Road (Contract No.: GW/2020/05/073). The purpose
of the development in Zone 2A is to reserve for Integrated Basement (IB) and
Underground Road (UR). The Zone 2A construction activities involve the
foundation, excavation and lateral support (ELS) works, road works, drainage
diversion works, and temporary car parking. The construction works and EM&A
programme for Zone 2A commenced on 3 October 2020.
The overall works for the WKCD fall under two separate categories of
Designated Project (DP) of the Environmental Impact Assessment Ordinance
(EIAO), namely an “engineering feasibility study of urban development projects
with a study area covering more than 20 ha or involving a total population of
more than 100 000” (Item 1 of Schedule 3) and “an underpass more than 100m in
length under the built areas” (Item A.9, Part I, Schedule 2). An Environmental
Permit No. EP-453/2013/B (EP) was issued with respect to the “Underpass Road
and Austin Road Flyover Serving the West Kowloon Cultural District” which
specifically includes the abovementioned category of DP under Item A.9, Part I,
Schedule 2 of the EIAO. The captioned projects include part of the
abovementioned underpass road located within the site boundary falls under this
same category.
The Monthly EM&A Report is
prepared in accordance with the Condition 3.4 of the Environmental Permit No.
EP-453/2013/B. This Monthly EM&A Report presents
the monitoring works at Zone 2A from 3 to 31 October 2020. The purpose of this report is to
summarise the findings in the EM&A of the project over the reporting
period.
The
organisation chart and lines of communication with respect to the on-site
environmental management structure together with the contact information of the
key personnel are shown in Appendix A.
During the reporting period, construction works at Zone 2A
undertaken include:
●
Preliminaries Works
●
Grouting Curtain Works (Trial 1
& Trial 2)
●
Bored Pile Works
–
Bored Pile Works (Predrilling)
–
Bored Pile Construction
●
ELS (Stage 1)
–
Grouting Works
The Construction Works Programme of Zone 2A is
provided in Appendix B. A layout plan of the Project is provided in Figure
1. Please refer to Table 4.2 on the
status of the environmental licenses.
1.4
Summary of EM&A Requirements and Alternative Monitoring Locations
The EM&A programme requires environmental monitoring of air
quality, noise, landscape and visual as
specified in the approved EM&A Manual.
A summary of impact EM&A requirements
is presented in Table 1.1.
Table 1.1: Summary
of Impact EM&A Requirements
|
Parameters
|
Descriptions
|
Locations
|
Frequencies
|
|
Air
Quality
|
24-Hours TSP
|
AM3-The
Victoria Towers Tower 1
|
At least once every 6 days
|
|
1-Hour TSP
|
AM3-The
Victoria Towers Tower 1
|
At least 3 times every 6 days
|
|
24-Hours TSP
|
AM4-Canton
Road Government Primary School
|
At least once every 6 days
|
|
1-Hour TSP
|
AM4-Canton
Road Government Primary School
|
At least 3 times every 6 days
|
|
24-Hours TSP
|
AM5-Topside Developments at West
Kowloon Terminus Site
|
At least once every 6 days
|
|
1-Hour TSP
|
AM5-Topside Developments at West
Kowloon Terminus Site
|
At least 3 times every 6 days
|
|
Noise
|
Leq,
30 minutes
|
NM2-The
Arch, Sun Tower
|
Weekly
|
|
Leq,
30 minutes
|
NM3-The
Victoria Towers Tower 1
|
Weekly
|
|
Leq,
30 minutes
|
NM4-Canton
Road Government Primary School
|
Weekly
|
|
Leq,
30 minutes
|
NM5-Development next to Austin
Station
|
Weekly
|
|
Landscape & Visual
|
Monitor implementation of proposed mitigation measures during
the construction stage
|
As described in Table 9.1 and 9.2 of the EM&A Manual
|
Bi-Weekly
|
The EM&A
programme for the Project should require 5 noise monitoring station and 5 air
quality monitoring stations located closest to the Project area. With regard to the monitoring activities
at M+ Museum and the Lyric Complex, three monitoring stations had been
considered, including AM1 (International Commerce Centre), AM2 (The Harbourside
Tower 1) for air monitoring, and NM1 (The Harbourside Tower 1) for noise
monitoring.
In the context of the construction
activities in Zone 2A, all other monitoring locations including AM3 (The Victoria Towers Tower 1), AM4 (Canton Road Government Primary
School), and AM5 (Topside Developments at West Kowloon Terminus
Site) for air monitoring; and NM2 (The Arch, Sun
Tower), NM3 (The Victoria Towers Tower 1), NM4 (Canton Road Government Primary
School) and NM5 (Development next to Austin Station) for noise
monitoring, have
been taken into account. However, access to all these originally designated
monitoring stations was declined as described below point-by-point.
The Arch management office and owners’
committee have formally declined the proposal of setting up noise monitoring
instrument on its premises at the podium level of Sun Tower (NM2) on 24 July
2014. Thus, alternative
noise monitoring location was identified at the ground floor in front of The Arch – Sun Tower (NM2A),
which is at the same location as stated in the EM&A Manual for consistency. No management
approval is required at the ground floor for conducting the noise monitoring. This alternative air monitoring location was approved by EPD on 29
September 2020.
The Victoria Towers management
office formally declined the proposal of setting up air
quality and noise monitoring instruments on its premises at the podium area
of Tower 1 (AM3/NM3) on 16 June 2020. Alternative air monitoring location was
identified at ground floor at the Northeast corner of West Kowloon Station’s
station box (AM3A), in the same direction to the area of major construction
site activities in Zone 2A. This alternative air monitoring location was
approved by EPD on 29 September 2020. An alternative noise monitoring location
was identified at the ground floor in front of the Xiqu
Centre (NM3A), which is set closer to the construction site boundary with more
direct line sight to the major site activities and higher exposure to the
construction noise with no disturbance to the premises’ occupants during noise
monitoring activities. No management approval is required at the ground floor
for conducting the noise monitoring. This alternative air monitoring location
was approved by EPD on 29 September 2020.
Canton Road Government Primary
School formally declined the proposal of setting up air
quality and noise monitoring instruments on its premise at the podium level (AM4/NM4) on 16 June 2020. Alternative air monitoring
location was identified at ground floor at the Southeast corner of West Kowloon Station’s station box
(AM4A), in same direction to the area of major construction site activities in
Zone 2A. This alternative air monitoring location was approved by EPD on 29
September 2020. An alternative noise monitoring
location was identified at the ground floor next to Tsim Sha Tsui Fire
Station (NM4A), which is set closer to the construction site boundary
with more direct line sight to the major site activities and higher exposure to
the construction noise with no disturbance to the premises’ occupants during noise monitoring
activities. No management approval is required at the ground floor for
conducting the noise monitoring. This alternative air monitoring location was
approved by EPD on 29 September 2020.
MTR also formally declined the
access to the designated AM5 location (topside developments at West Kowloon
Terminus Site) on 15 July 2020. Alternative air monitoring location was
identified at ground floor at the North
of West Kowloon Station’s station box (AM5A), in same direction
to the area of major construction site activities in Zone 2A. This alternative
air monitoring location was approved by EPD on 29 September 2020.
Grand Austin property management
office formally declined our proposal of setting up noise monitoring instrument on its premises at the podium
level (NM5) on 10 July 2020. Alternative noise monitoring location was
identified at the Pedestrian road (ground floor) outside West Kowloon Station
(NM5A), which is set closer to the
construction site boundary with more direct line sight to the major site
activities and higher exposure to the construction noise with no disturbance to
the premises’ occupants during noise monitoring activities. No management
approval is required at the ground floor for conducting the noise monitoring.
This alternative air monitoring location was approved by EPD on 29 September
2020.
The Environmental Quality Performance Limits for air quality and
noise are shown in Appendix C.
The Event and Action Plan for air quality, construction noise, and landscape and visual are shown in Appendix D.
The EM&A programme followed
the recommended mitigation measures in the EM&A Manual. The EM&A
requirements as well as the summary of implementation status of the
environmental mitigation measures are provided in Appendix J.
Air quality and noise monitoring
methodology, including the monitoring locations, equipment used, parameters, frequency
and duration etc., are described in this Section. The environmental monitoring
schedules for the reporting period and the tentative monitoring Schedule for
the coming month are provided in Appendix
E.
The relevant EM&A monitoring
requirements and details for landscape and audit impact, are also presented in
this Section.
Table
2.1 summarizes the monitoring parameters,
frequency and duration of the TSP monitoring.
Table
2.1: Air
Quality Monitoring Parameters, Frequency and Duration
|
Parameter
|
Frequency
|
Duration
|
|
24-hour TSP
|
At least once in every six-days
|
24 hours
|
|
1-hour TSP
|
At least 3 times every six-days
|
60 minutes
|
2.2.2
Monitoring Locations
Monitoring
stations and locations are given in Table 2.2
and shown in Figure 1
.
Table 2.2: Air Quality
Monitoring Station
|
Monitoring Station
|
Location Description
|
|
AM3A
|
Northeast corner of West Kowloon Station’s station box
(G/F)
|
|
AM4A
|
Southeast corner of West Kowloon Station’s station box
(G/F)
|
|
AM5A
|
North of West Kowloon Station’s station box (G/F)
|
2.2.3
Monitoring Equipment
Continuous 24-hour TSP air quality monitoring was conducted using
High Volume Sampler (HVS) (Model: TE-5170) located at the designated monitoring
station. The HVS meets all the requirements stated in of the EM&A Manual.
Portable direct reading dust meter was used to carry out the 1-hour TSP
monitoring. Table 2.3 summarizes the equipment used in the impact air quality monitoring.
Copies of the calibration certificates for the HVS, calibration kit and
portable dust meters are attached in Appendix
F.
Table 2.3: TSP
Monitoring Equipment
|
Equipment
|
Model
|
|
24-hour TSP monitoring
|
|
High Volume Sampler
|
TE-5170 (Serial No.: 4340; 3998; 4344)
|
|
Calibrator
|
TE-5025A (Orifice I.D.: 3543)
|
|
1-hour TSP monitoring
|
|
Portable direct reading dust meter
|
Sibata LD-3B (Serial No.: 276004,
336338, 567188)
|
Calibration of the HVS (five-point
calibration) using Calibration Kit was carried out every two months. The HVS
calibration orifice will be calibrated annually. Calibration certificate of the
TE-5025A Calibration Kit and the HVS are provided in Appendix F.
The 1-hour TSP monitoring
should be determined periodically (e.g. annually) by the HVS to check the
validity and accuracy of the results measured by direct reading method.
24-hour TSP Monitoring
Installation
The HVS was installed at the site boundary. The following criteria
were considered in the installation of the HVS.
–
A horizontal platform with
appropriate support to secure the sampler against gusty wind was provided.
–
The distance between the HVS
and any obstacles, such as buildings, was at least twice the height that the
obstacle protrudes above the HVS.
–
A minimum of 2 metres
separation from walls, parapets and penthouse was required for rooftop sampler.
–
A minimum of 2 metres
separation from any supporting structure, measured horizontally was required.
–
No furnace or incinerator flues
or building vent were nearby.
–
Airflow around the sampler was
unrestricted.
–
The sampler has been more than
20 metres from any drip line.
–
Permission was obtained to set
up the sampler and to obtain access to the monitoring station.
–
A secured supply of electricity
is needed to operate the sampler.
Preparation of Filter
Papers
–
Glass fibre filters were
labelled and sufficient filters that were clean and without pinholes were
selected.
–
The filters used are specified
to have a minimum collection efficiency of 99 percent for 0.3 µm (DOP)
particles.
–
All filters were equilibrated
in the conditioning environment for 24 hours before weighing. The conditioning
environment temperature was around 25 °C and not variable by more than ±3 °C
with relative humidity (RH) < 50% and was not variable by more than ±5
%. A convenient working RH was 40%. All preparation of filters was done by Hong Kong Laboratory Accreditation Scheme (HOKLAS) accredited laboratory.
Field Monitoring Procedures
–
The power supply was checked to
ensure the HVS works properly.
–
The filter holder and the area
surrounding the filter were cleaned.
–
The filter holder was removed
by loosening the four bolts and a new filter, with stamped number upward, on a
supporting screen was aligned carefully.
–
The filter was properly aligned
on the screen so that the gasket formed an airtight seal on the outer edges of
the filter.
–
The swing bolts were fastened
to hold the filter holder down to the frame. The pressure applied should be
sufficient to avoid air leakage at the edges.
–
The shelter lid was closed and
was secured with the aluminium strip.
–
The HVS was warmed-up for about
5 minutes to establish run-temperature conditions.
–
A new flow rate record sheet was
set into the flow recorder.
–
The flow rate of the HVS was
checked and adjusted at around 1.3 m3/min. The range specified in the
EM&A Manual was between 0.6-1.7 m3/min.
–
The programmable timer was set
for a sampling period of 24 hours, and the starting time, weather condition and
the filter number were recorded.
–
The initial elapsed time was
recorded.
–
At the end of sampling, the
sampled filter was removed carefully and folded in half
length so that only surfaces with collected particulate matter were in
contact.
–
It was then placed in a clean
plastic envelope and sealed.
–
All monitoring information was
recorded on a standard data sheet.
–
Filters were sent to a Hong
Kong Laboratory Accreditation Scheme (HOKLAS) accredited laboratory for
analysis.
Maintenance and Calibration
–
The HVS and its accessories are
maintained in good working condition, such as replacing motor brushes routinely
and checking electrical wiring to ensure a continuous power supply.
–
HVSs were calibrated upon
installation and thereafter at bi-monthly intervals. The calibration kits were
calibrated annually.
–
Calibration
records for HVS and calibration kit are shown in Appendix F.
1-hour TSP Monitoring
Field Monitoring
The measuring procedures of the 1-hour dust meter are in accordance with
the Manufacturer’s Instruction Manual as follows:
–
Turn the power on.
–
Close the air collecting
opening cover.
–
Push the “TIME SETTING” switch
to [BG].
–
Push “START/STOP” switch to
perform background measurement for 6 seconds.
–
Turn the knob at SENSI ADJ position
to insert the light scattering plate.
–
Leave the equipment for 1
minute upon “SPAN CHECK” is indicated in the display.
–
Push “START/STOP” switch to
perform automatic sensitivity adjustment. This measurement takes 1 minute.
–
Pull out the knob and return it
to MEASURE position.
–
Setting time period of 1 hour for the 1-hour TSP
measurement.
–
Push
“START/STOP” to start the 1-hour TSP measurement.
–
Regular checking of the time period setting to ensure monitoring time of
1 hour.
Maintenance and Calibration
–
The 1-hour dust meter would be
checked at 3-month intervals and calibrated at 1-year intervals throughout all
stages of the air quality monitoring.
–
Calibration records for direct
dust meters are shown in Appendix F.
Weather Condition
–
Meteorological data extracted
from Hong Kong Observatory for the reporting month is provided in Appendix H.
Table 2.4 summarizes the monitoring parameters,
frequency and duration of noise monitoring. The noise in A-weighted levels Leq, L10 and L90 are
recorded in a 30-minute interval between 0700 and 1900 hours.
Table 2.4: Noise Monitoring
Parameters, Period and Frequency
|
Time Period
|
Parameters
|
Frequency
|
|
Daytime
on normal weekdays
(0700-1900
hours)
|
Leq(30 min), L90(30 min) & L10 (30
min)
|
Once
every week
|
Note: *70 dB(A) for
schools and 65 dB(A) during school examination periods.
If works are to be carried out during restricted hours, the conditions
stipulated in the Construction Noise Permit (CNP) issued by the Noise Control
Authority have to be followed.
Noise monitoring stations and locations are given in Table 2.5 and shown in Figure .
Table 2.5: Noise
Monitoring Station
|
Monitoring Station
|
Location
|
|
NM2A
|
The Arch – Sun
Tower (G/F)
|
|
NM3A
|
Xiqu Centre (G/F)
|
|
NM4A
|
Next to Tsim Sha Tsui Fire Station (G/F)
|
|
NM5A
|
Pedestrian road (G/F) outside West Kowloon
Station
|
2.3.2
Monitoring Equipment
Integrating Sound Level
Meter was used for noise monitoring. It was a Type 1 sound level meter capable
of giving a continuous readout of the noise level readings including equivalent
continuous sound pressure level (LAeq) and percentile
sound pressure level (Lx). They comply with International
Electrotechnical Commission Publications 651:1979 (Type 1) and 804:1985 (Type
1). Table 2.6 summarizes the noise monitoring
equipment model being used.
Table 2.6: Noise
Monitoring Equipment
|
Equipment Model
|
|
|
Integrating Sound Level Meter
|
Calibrator
|
|
AWA5661 (Serial No.:
304723)
|
Pulsar 100B (Serial No.: 039507)
|
2.3.3
Monitoring Methodology
Field Monitoring
–
The microphone of the Sound
Level Meter was set at least 1.2 m above the ground.
–
Free Field measurement was made
at NM5A monitoring location.
–
The battery condition was
checked to ensure the correct functioning of the meter.
–
Parameters such as frequency
weighting, the time weighting and the measurement time were set as follows:
- frequency weighting:
A
- time weighting: Fast
- time measurement: 30
minutes intervals (between 0700-1900 on normal
weekdays)
–
Prior to and after each noise
measurement, the meter was calibrated using a Calibrator for 94 dB at 1
kHz. If the difference in the
calibration level before and after measurement was more than 1 dB, the
measurement would be considered invalid and has to be repeated after re-calibration or repair of the equipment.
–
During the monitoring period,
the Leq, L10 and L90
were recorded. In addition, any
site observations and noise sources were recorded on a standard record sheet.
–
A correction of +3dB(A) was
made to the free field measurements.
Maintenance and Calibration
–
The microphone head of the
sound level meter and calibrator is cleaned with soft cloth at quarterly
intervals.
–
The sound level meter and
calibrator are sent to the supplier or HOKLAS laboratory to check and calibrate
at yearly intervals.
–
Calibration records are shown
in Appendix F.
Weather Condition
–
Meteorological data extracted
from Hong Kong Observatory for the reporting month is provided in Appendix H.
2.4
Landscape and Visual
Table 2.7 details the monitoring program (as proposed in the WKCD EIA report)
for landscape and visual impact during the construction phase.
Table 2.7: Monitoring Program
for Landscape and Visual Impact during Construction Phase
|
Stage
|
Monitoring
Task
|
Frequency
|
Report
|
Approval
|
|
Construction
|
Monitor implementation of proposed mitigation
measures during the construction stage.
|
Bi-weekly
|
ET to report on Contractor’s compliance
|
Counter-signed by IEC
|
During the landscape and visual impact monitoring, any changes in
relation to the landscape and visual amenity should be monitored with reference
to the baseline conditions of the site. In addition, mitigation measures were
proposed in the WKCD EIA report to minimise the landscape and visual impacts
during the construction phase. The proposed mitigation measures as shown in
Table 9.1 and Table 9.2 of the EM&A Manual should be checked for proper
implementation.
Air quality, noise
and landscape and visual impact
monitoring was undertaken in compliance
with the EM&A Manual during the reporting
month.
3.2
Air Quality Monitoring
Results of 1-hour TSP are summarised in Table 3.1. Graphical plots of the monitoring results are shown in Appendix G.
Table 3.1: Summary
of 1-hour TSP monitoring results
|
Monitoring Station
|
Monitoring Date
|
Start Time
|
1-hour TSP (μg/m3)
|
Range (μg/m3)
|
Action Level (μg/m3)
|
Limit Level (μg/m3)
|
|
1st Result
|
2nd Result
|
3rd Result
|
|
AM3A
|
03 Oct 20
|
8:06
|
56
|
60
|
53
|
42-77
|
280.4
|
500
|
|
07 Oct 20
|
14:09
|
45
|
53
|
46
|
|
12 Oct 20
|
8:13
|
61
|
59
|
66
|
|
17 Oct 20
|
14:17
|
56
|
62
|
53
|
|
19 Oct 20
|
8:04
|
48
|
51
|
42
|
|
24 Oct 20
|
14:12
|
67
|
77
|
72
|
|
30 Oct 20
|
8:18
|
68
|
64
|
70
|
|
AM4A
|
03 Oct 20
|
8:14
|
61
|
54
|
53
|
43-73
|
278.5
|
500
|
|
07 Oct 20
|
14:17
|
49
|
55
|
53
|
|
12 Oct 20
|
8:21
|
60
|
54
|
58
|
|
17 Oct 20
|
14:25
|
51
|
60
|
64
|
|
19 Oct 20
|
8:12
|
55
|
43
|
59
|
|
24 Oct 20
|
14:20
|
61
|
62
|
73
|
|
30 Oct 20
|
8:26
|
64
|
62
|
69
|
|
AM5A
|
03 Oct 20
|
8:29
|
64
|
63
|
51
|
42-76
|
275.4
|
500
|
|
07 Oct 20
|
14:34
|
48
|
50
|
43
|
|
12 Oct 20
|
8:36
|
63
|
55
|
61
|
|
17 Oct 20
|
14:42
|
61
|
58
|
66
|
|
19 Oct 20
|
8:27
|
43
|
42
|
57
|
|
24 Oct 20
|
14:37
|
60
|
64
|
76
|
|
30 Oct 20
|
8:41
|
61
|
76
|
72
|
3.2.2
24-hour TSP
Results of 24-hour TSP are summarised in Table 3.2. Graphical plots of the monitoring results are shown in Appendix G.
Table 3.2: Summary
of 24-hour TSP monitoring results
|
Monitoring Station
|
Monitoring Date
|
Start Time
|
Monitoring Results (μg/m3)
|
Range (μg/m3)
|
Action Level (μg/m3)
|
Limit Level (μg/m3)
|
|
AM3A
|
03 Oct 20
|
10:00
|
51.6
|
40.6-65.3
|
152.4
|
260
|
|
07 Oct 20
|
10:00
|
44.2
|
|
12 Oct 20
|
10:00
|
57.2
|
|
17 Oct 20
|
10:00
|
56.7
|
|
19 Oct 20
|
10:00
|
40.6
|
|
24 Oct 20
|
10:00
|
65.3
|
|
30 Oct 20
|
10:00
|
63.2
|
|
AM4A
|
03 Oct 20
|
10:00
|
50.8
|
43.2-62.0
|
152.6
|
260
|
|
07 Oct 20
|
10:00
|
45.7
|
|
12 Oct 20
|
10:00
|
53.8
|
|
17 Oct 20
|
10:00
|
49.9
|
|
19 Oct 20
|
10:00
|
43.2
|
|
24 Oct 20
|
10:00
|
62.0
|
|
30 Oct 20
|
10:00
|
59.3
|
|
AM5A
|
03 Oct 20
|
10:00
|
49.5
|
40.6-61.1
|
141.1
|
260
|
|
07 Oct 20
|
10:00
|
40.6
|
|
12 Oct 20
|
10:00
|
53.6
|
|
17 Oct 20
|
10:00
|
58.5
|
|
19 Oct 20
|
10:00
|
40.9
|
|
24 Oct 20
|
10:00
|
57.2
|
|
30 Oct 20
|
10:00
|
61.1
|
No exceedance of 1-hour and 24-hour TSP
(Action or Limit Level) was recorded in the reporting period.
The construction noise
monitoring results are summarized in Table 3.3. Graphical plots of the
monitoring data and the station set-up as façade and free-field measurements
are shown in Appendix G.
Table 3.3: Summary
of noise monitoring results during normal weekdays
|
Monitoring
Stations
|
Monitoring
Date
|
Start Time
|
End Time
|
Leq
(30 mins) dB(A)
|
Limit Level
for Leq (dB(A))
|
|
NM2A
|
03 Oct 20
|
08:06
|
08:36
|
63.9
|
75
|
|
07 Oct 20
|
14:09
|
14:39
|
62.7
|
|
12 Oct 20
|
08:13
|
08:43
|
64.2
|
|
17 Oct 20
|
14:17
|
14:47
|
62.1
|
|
19 Oct 20
|
08:04
|
08:34
|
63.0
|
|
24 Oct 20
|
14:12
|
14:42
|
62.4
|
|
30 Oct 20
|
08:18
|
08:48
|
63.2
|
|
NM3A
|
03 Oct 20
|
09:45
|
10:15
|
74.2
|
75
|
|
07 Oct 20
|
15:51
|
16:21
|
73.4
|
|
12 Oct 20
|
09:52
|
10:22
|
73.6
|
|
17 Oct 20
|
15:59
|
16:29
|
73.1
|
|
19 Oct 20
|
09:43
|
10:13
|
73.7
|
|
24 Oct 20
|
15:54
|
16:24
|
73.5
|
|
30 Oct 20
|
10:00
|
10:30
|
74.0
|
|
NM4A
|
03 Oct 20
|
10:20
|
10:50
|
66.3
|
70^#
|
|
07 Oct 20
|
16:26
|
16:56
|
67.7
|
|
12 Oct 20
|
10:27
|
10:57
|
67.1
|
|
17 Oct 20
|
16:34
|
17:04
|
66.6
|
|
19 Oct 20
|
10:18
|
10:48
|
66.8
|
|
24 Oct 20
|
16:29
|
16:59
|
67.4
|
|
30 Oct 20
|
10:35
|
11:05
|
66.7
|
|
NM5A*
|
03 Oct 20
|
08:56
|
09:35
|
64.3
|
75
|
|
07 Oct 20
|
15:01
|
15:40
|
65.2
|
|
12 Oct 20
|
09:03
|
09:42
|
64.1
|
|
17 Oct 20
|
15:09
|
15:48
|
64.7
|
|
19 Oct 20
|
08:54
|
09:33
|
65.3
|
|
24 Oct 20
|
15:04
|
15:43
|
64.9
|
|
30 Oct 20
|
09:10
|
09:49
|
65.1
|
|
Remarks:
* +3dB (A) correction was applied to
free-field measurement.
^
70 dB(A) for schools and 65 dB(A) during school examination
periods.
# No school examination during the reporting period.
|
No exceedance (Action/Limit
Level) of construction noise was recorded in the reporting period.
Construction works
were extended to 1900-2300 hours on 19 to 24 October, and 27 to 31 October 2020
and to holidays on 18, 25 and 26 October 2020. In accordance with the EM&A
Manual, additional monitoring was carried out during the restricted hours on 18,
19, 24, 25 and 30 October 2020. the Leq (5
mins) is in the range of 52.4-69.8 dB(A).
Construction Noise Permits for the works carried out during restricted
hours were obtained and listed in Table 4.2.
3.4
Landscape and Visual Impact
Landscape and visual impact inspections were conducted as part of
the weekly site inspections on 15 and 29 October 2020 for Zone 2A during the
reporting month. As reviewed by the registered Landscape Architect, no adverse
comment on landscape and visual aspects was made during these inspections.
The landscape and visual mitigation measures were implemented during
the reporting period. The summary of implementation status of the environmental mitigation
measures is provided in Appendix J.
Construction phase weekly site
inspections were carried out on 8, 15, 22 and 29 October 2020. The joint site
inspection with IEC, ET, ER and Contractor was held on 22 October 2020. All
observations have been recorded in the site inspection checklist and passed to
the Contractor together with the appropriate recommended mitigation measures
where necessary. The
key observations from the site inspections and associated recommendations are
summarized in Table
4.1.
Table 4.1: Summary
of Site Inspections and Recommendations for Zone 2A
|
Inspection Date
|
Parameter
|
Observation / Recommendation
|
Contactor’s Responses /
Action(s) Undertaken
|
Close-out (Date)
|
|
08-Oct-20
|
Air Quality
|
Stockpile was found without proper cover. Contractor was reminded to
cover it with impervious sheeting or removed it from the site.
|
The contractor has removed the stockpile.
|
09-Oct-20
|
|
08-Oct-20
|
Noise
|
Noise barrier
are suggested to provide at sensitive area while noisy construction works
carried out.
|
Noise barrier
was provided.
|
09-Oct-20
|
|
08-Oct-20
|
Water Quality
|
Contractor was reminded to clean the settlement pool to handle
stormwater during rainstorm.
|
The contractor has cleaned the settlement pool regularly.
|
10-Oct-20
|
|
15-Oct-20
|
Air Quality
|
Stockpile was found without proper cover. The contractor was reminded
to cover it with impervious sheeting or removed it from the site.
|
The stockpile was fully covered by impervious sheet.
|
16-Oct-20
|
|
15-Oct-20
|
Noise
|
Noise insulating fabric should be lapped and avoid gap between to
maintain proper function.
|
Noise insulating fabric was fixed to minimise gap occurred.
|
17-Oct-20
|
|
15-Oct-20
|
Water Quality
|
Contractor was suggested to provide sump pump to collect and direct
stormwater from slope to the water treatment facilities.
|
Sump pump system has provided.
|
22-Oct-20
|
|
15-Oct-20
|
Water Quality
|
Drip tray should be provided to prevent chemical leakage.
|
Drip tray was provided to prevent chemical leakage.
|
16-Oct-20
|
|
22-Oct-20
|
Air Quality
|
Stockpile was found without proper cover. Contractor was reminded to
cover it with impervious sheeting or removed it from the site.
|
The stockpile was fully covered by impervious sheet.
|
23-Oct-20
|
|
22-Oct-20
|
Water Quality
|
Contractor are reminded to U-channel should be cleaned regularly.
|
U-channel was
cleaned by contractor regularly.
|
23-Oct-20
|
|
29-Oct-20
|
Air Quality
|
Stockpile was found without proper cover. Contractor was reminded to
cover it with impervious sheeting or removed it from the site.
|
The stockpile was fully covered by impervious sheet.
|
30-Oct-20
|
|
29-Oct-20
|
Water Quality
|
Contractor was reminded the sump pump system need to be connect and maintain proper function.
|
Contractor
maintained sump pump system functioned properly.
|
30-Oct-20
|
|
29-Oct-20
|
Water Quality
|
Contractor are reminded to U-channel should be cleaned regularly. The
stockpile nearby the U-channel shall fully cover and/or move away to prevent
washing away of materials into the drainage system.
|
The U-channel
was cleaned by contractor regularly. The Stockpile was covered with
tarpaulin.
|
30-Oct-20
|
4.2
Advice on the Solid and Liquid Waste Management Status
The Contractors have been
registered as a chemical waste producer for the Project. Construction and
demolition (C&D) material sorting will be carried out on site. A sufficient
number of receptacles were available for general refuse collection.
As advised by the Contractor, 18.79 tonnes, 93.03
tonnes, 2511.66 tonnes of inert C&D material were disposed of as public
fill to Chai Wan Public Fill Barging Point, Tseung Kwan O Area 137 Public Fill, and Tuen Mun
Area 38 respectively in the reporting month. 21.94 tonnes of general refuse
were disposed of at SENT landfill. 0.00 tonnes of metal, 0.00 tonnes of
paper/cardboard packaging, 0.00 tonne of plastic and 0.00 tonne of timber were
collected by recycling contractors in the reporting month. 0.00 tonne of inert
C&D material was reused on site. 0.00 tonne of inert C&D material was
reused in other projects. 0.00 tonne of chemical waste was collected by
licensed contractors in the reporting period.
The cumulative waste generation
records for Zone 2A are shown in Appendix I.
4.3
Status of Environmental
Licenses and Permits
The environmental permits,
licenses, and/or notifications on environmental protection for this Project
which were valid during the period are summarised in Table 4.2.
Table 4.2: Status
of Environmental Submissions, Licenses and Permits for Zone 2A
|
Permit / License No.
/ Notification /
Reference No.
|
Valid Period
|
Status
|
Remarks
|
|
From
|
To
|
|
Chemical Waste Producer Registration
|
|
WPN5113-256-B2597-01
|
10-Sep-20
|
--
|
Valid
|
--
|
|
Billing Account Construction Waste
Disposal
|
|
7037500
|
09-Jun-20
|
--
|
Account
Active
|
--
|
|
Construction Noise Permit
|
|
GW-RE0672-20
|
06-Aug-20
|
26-Jan-21
|
Valid
|
One
Generator
|
|
GW-RE-081620
|
25-Sep-20
|
24-Nov-20
|
Valid
|
Piling
Works
|
|
Wastewater
Discharge License
|
|
457581
|
--
|
--
|
Under
EPD Approval
|
--
|
|
Notification
under Air Pollution Control (Construction Dust) Regulation
|
|
456376
|
21-May-20
|
--
|
Notified
|
--
|
4.4
Recommended Mitigation
Measures
The EM&A programme followed
the recommended mitigation measures in the EM&A Manual. The EM&A
requirements as well as the summary of implementation status of the
environmental mitigation measures are provided in Appendix J. In particular, the following mitigation measures were
brought to attention during the site inspections:
Air Quality
– Maintain water spraying for active
construction area.
– Stockpile should be fully covered while not in use
or removed from the site.
Noise
Control
– Provide movable noise barrier for
piling works.
Temporary
Water Drainage System & Water Quality
– The temporary drainage system should be updated with the site
condition.
– U-channel should be cleaned regularly.
– Open
stockpiles should be fully covered with tarpaulin or similar fabric while not
in use to prevent the washing away of materials into any drainage system.
– Drain surface should be covered adequately to prevent silt being
washed out into the drainage system.
– Drip
tray should be provided for chemical storage area to prevent leakage.
5
Compliance with Environmental Permit
The status
of the required submission under the EP during the reporting period is
summarized in Table 5.1.
Table 5.1: Status of Submissions under the Environmental Permit
|
EP Condition
|
Submission
|
Submission
Date
|
|
Condition 3.3
|
Supplementary Baseline Monitoring Report for AM5A and NM5A
|
18 September 2020
|
There was no breach of
Action or Limit Levels for Air Quality and Noise monitoring in the reporting
month.
6.2
Record on Environmental
Complaints Received
No
environmental complaint was recorded in the reporting month. The cumulative statistics on complaints were provided in Appendix K.
No notifications of summons
or successful prosecutions were received this month. The cumulative statistics
on notifications of summons and successful prosecutions were provided in Appendix K.
● Grouting Curtain Works
(Trial 1 & Trial 2)
● Bored Pile Works
– Bored Pile Works (Predrilling)
– Bored Pile Construction
● ELS (Stage 1)
– Grouting
Works
Key issues to be considered in
the coming month include:
● Update of temporary water
drainage system;
● Noise impact from piling works;
● Generation of site surface
runoffs and wastewater from activities on-site;
● Management of stockpiles and
slopes, particularly on rainy days;
● Sorting, recycling, storage and
disposal of general refuse and construction waste; and
● Management of chemicals and
avoidance of oil spillage on-site.
The environmental site inspection and environmental
monitoring will be continued in the coming month. Impact monitoring for air
quality and noise in accordance with the approved EM&A Manual has commenced
since 3 October 2020
for Zone 2A. The tentative monitoring schedule for the
coming month is shown in the Appendix E.
The EM&A programme as recommended in the EM&A Manual has
been undertaken with the commencement of the construction activities at Zone 2A
on 3 October 2020.
Monitoring of air quality and noise with respect to the Projects is
underway. In particular, the 1-hour TSP, 24-hour TSP, noise level (as Leq, 30 minutes) under monitoring have been
checked against established Action and Limit levels. There was no breach of
Action and Limit Levels for 1-hour TSP, 24-hour TSP and noise in the reporting
month.
No environmental complaints were recorded in the reporting month. No
notifications of summons or successful prosecutions were received during the
reporting month.
Weekly
construction phase site inspections and bi-weekly landscape and visual impact
inspections were conducted during the reporting month as required. It was
observed that the Contractors had implemented all possible and feasible
mitigation measures to mitigate the potential environmental impacts during
construction phase works.
Potential environmental impacts
due to the construction activities, including air quality, noise, water quality, waste, landscape and visual, will
be monitored or reviewed. The recommended environmental mitigation measures
shall be implemented on site and regular inspections as required will be
carried out to ensure that the environmental conditions are acceptable.
