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
1 to 30 April 2021.
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) in this reporting month.
One Action Level exceedance due to one complaint with no Limit Level
exceedance of construction noise was recorded in the reporting month.
Implementation of
Mitigation Measures
Construction phase weekly site inspections
were carried out on 1, 8, 15, 22 and 28 April 2021
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.
EPD site inspection was conducted at Zone 2A project on 09 April
2021.
Record of Complaints
Two environmental complaint (of which one was related to Zone 2A) was
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:
Zone 2A-1
●
Grouting Works (Trial 1)
–
Post Drilling
–
Install Pump Wells
–
Pumping Test
●
Grouting Works (Trial 2)
–
Pumping Test
●
ELS (Stage 1) – Grouting / Pipe Pile Works
–
King Post
●
Socketed H-Pile Works
–
Remaining Socket H-Pile Works
●
Bored Pile Works
–
Bored Pile Construction
Zone 2A-2
●
Bored Pile Works
– Additional
Bored Pile Construction
●
ELS (Stage 1) – Grouting / Pipe
Pile Works
–
Stage 1a & 1b Grouting
–
Pipe Pile Construction
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 1 to 30 April 2021. 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:
Zone 2A-1
●
Grouting Works (Trial 1)
–
Stage 2 Grouting
–
Post Drilling
●
Grouting Works (Trial 2)
–
Install Pump Wells
●
Bored Pile Works
–
Bored Pile Construction
Zone 2A-2
●
Bored Pile Works
– Additional
Bored Pile Construction
●
ELS (Stage 1) – Grouting / Pipe
Pile Works
–
Stage 1a & 1b Grouting
–
Pipe Pile Construction
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.: 235811, 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 1.
Table 2.5: Noise
Monitoring Station
2.3.3
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.: 301135)
|
Pulsar 100B (Serial No.: 039507)
|
2.3.4
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
|
01-Apr-21
|
8:11
|
42
|
50
|
46
|
30-81
|
280.4
|
500
|
|
07-Apr-21
|
14:20
|
50
|
61
|
55
|
|
12-Apr-21
|
8:20
|
40
|
52
|
48
|
|
17-Apr-21
|
13:55
|
66
|
64
|
62
|
|
23-Apr-21
|
8:11
|
81
|
74
|
77
|
|
29-Apr-21
|
14:13
|
34
|
30
|
38
|
|
AM4A
|
01-Apr-21
|
8:19
|
40
|
46
|
51
|
31-79
|
278.5
|
500
|
|
07-Apr-21
|
14:28
|
66
|
62
|
59
|
|
12-Apr-21
|
8:28
|
55
|
52
|
63
|
|
17-Apr-21
|
14:03
|
68
|
63
|
70
|
|
23-Apr-21
|
8:19
|
75
|
76
|
79
|
|
29-Apr-21
|
14:21
|
31
|
33
|
36
|
|
AM5A
|
01-Apr-21
|
8:34
|
44
|
41
|
58
|
32-82
|
275.4
|
500
|
|
07-Apr-21
|
14:45
|
61
|
69
|
55
|
|
12-Apr-21
|
8:43
|
49
|
56
|
60
|
|
17-Apr-21
|
14:20
|
69
|
65
|
67
|
|
23-Apr-21
|
8:34
|
78
|
80
|
82
|
|
29-Apr-21
|
14:29
|
32
|
35
|
37
|
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
|
01-Apr-21
|
10:00
|
40.3
|
31.3-72.4
|
152.4
|
260
|
|
07-Apr-21
|
10:00
|
50.3
|
|
12-Apr-21
|
10:00
|
42.9
|
|
17-Apr-21
|
10:00
|
66.5
|
|
23-Apr-21
|
10:00
|
72.4
|
|
29-Apr-21
|
10:00
|
31.3
|
|
AM4A
|
01-Apr-21
|
10:00
|
42.2
|
31.2-73.9
|
152.6
|
260
|
|
07-Apr-21
|
10:00
|
59.9
|
|
12-Apr-21
|
10:00
|
51.6
|
|
17-Apr-21
|
10:00
|
61.3
|
|
23-Apr-21
|
10:00
|
73.9
|
|
29-Apr-21
|
10:00
|
31.2
|
|
AM5A
|
01-Apr-21
|
10:00
|
39.1
|
32.5-75.5
|
141.1
|
260
|
|
07-Apr-21
|
10:00
|
55.9
|
|
12-Apr-21
|
10:00
|
49.8
|
|
17-Apr-21
|
10:00
|
65.0
|
|
23-Apr-21
|
10:00
|
75.5
|
|
29-Apr-21
|
10:00
|
32.5
|
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
|
01-Apr-21
|
08:11
|
08:41
|
59.9
|
75
|
|
07-Apr-21
|
14:20
|
14:50
|
58.7
|
|
12-Apr-21
|
08:20
|
08:50
|
59.8
|
|
17-Apr-21
|
13:55
|
14:25
|
59.3
|
|
23-Apr-21
|
08:11
|
08:41
|
60.0
|
|
29-Apr-21
|
14:13
|
14:43
|
58.6
|
|
NM3A
|
01-Apr-21
|
09:41
|
10:11
|
71.0
|
75
|
|
07-Apr-21
|
15:53
|
16:23
|
71.7
|
|
12-Apr-21
|
09:50
|
10:20
|
68.6
|
|
17-Apr-21
|
15:28
|
15:58
|
68.7
|
|
23-Apr-21
|
09:41
|
10:11
|
70.4
|
|
29-Apr-21
|
15:55
|
16:25
|
69.7
|
|
NM4A
|
01-Apr-21
|
10:16
|
10:46
|
67.8
|
70/65^#
|
|
07-Apr-21
|
16:28
|
16:58
|
67.6
|
|
12-Apr-21
|
10:25
|
10:55
|
68.2
|
|
17-Apr-21
|
16:03
|
16:33
|
68.8
|
|
23-Apr-21
|
10:16
|
10:46
|
68.4
|
|
29-Apr-21
|
16:30
|
17:00
|
68.6
|
|
NM5A*
|
01-Apr-21
|
09:01
|
09:31
|
66.8
|
75
|
|
07-Apr-21
|
15:12
|
15:42
|
65.5
|
|
12-Apr-21
|
09:10
|
09:40
|
66.3
|
|
17-Apr-21
|
14:47
|
15:17
|
65.1
|
|
23-Apr-21
|
09:01
|
09:31
|
66.9
|
|
29-Apr-21
|
15:14
|
15:44
|
65.8
|
|
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 was during the reporting period.
|
One Action Level exceedance due to one complaint (related to Zone 2A) with
no Limit Level exceedance of construction noise was recorded in
the reporting month.
Construction works
were extended to 1900-2200 hours on 01, 07 to 10, 12 to 17, 19 to 24 and 26 to
30 April 2021; and to holidays 0900-1900 hours on 02 to 03, 06, 18 and 25 April
2021. In accordance with the EM&A Manual, additional monitoring was carried
out during the restricted hours on 01, 03, 06, 07, 12, 17, 18, 23, 25 and 29
April 2021. The Leq (5 mins) is in the range of 52.3-69.8 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 01, 15 and 29 April 2021 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 01, 08, 15, 22 and 28 April 2021. The joint
site inspection with IEC, ET, ER and Contractor was held on 15 April 2021. All
observations have been recorded in the site inspection checklist and passed to
the Contractor together with the appropriate recommended mitigation measures
where necessary.
EPD inspection was conducted at
Zone 2A project on 09 April 2021. No adverse comment in general. Verbal
advise had been given to contractor as below:
1. Final
water tank should be cleaned properly to ensure water in good quality before
discharge. 2. Final water tank should cover with tarpaulin sheet to avoid
contamination.
Follow-up actions has been taken by contractor to ensure good water
quality at final water tank before discharge.
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)
|
|
01-Apr-21
|
Air Quality
|
The contractor
was reminded that the stockpile should be fully covered / removed from site
when not in use.
|
The stockpile
was removed from the site.
|
07-Apr-21
|
|
01-Apr-21
|
Water Quality
|
The contractor
was reminded the U-channel should maintain well to ensure proper function.
|
The contractor
has cleaned and maintained the U-channel to ensure proper function.
|
07-Apr-21
|
|
01-Apr-21
|
Noise
|
The contractor
was reminded to erect noise screen at the side facing the noise sensitive
receiver to minimise noise impact.
|
The contractor
has erected the noise screen properly to screen noise effectively.
|
03-Apr-21
|
|
01-Apr-21
|
Water Quality
|
The contractor
was suggested to provide extra pump and drainage pipe to direct water to
treatment facility.
|
The contractor
has provided extra pump to direct water to treatment facility.
|
07-Apr-21
|
|
08-Apr-21
|
Waste
Management
|
The contractor was reminded to clean the drip
tray regularly to prevent chemical leakage to the ground.
|
The contractor
has cleaned the drip tray.
|
09-Apr-21
|
|
08-Apr-21
|
Air Quality
|
The contractor
was reminded to check/maintain the plant regularly to minimize generation of
dark smoke emission.
|
The contractor
has checked the plant and changed the diesel filter to minimize generation of
dark smoke emission.
|
09-Apr-21
|
|
08-Apr-21
|
Water Quality
|
The contractor
was reminded the U-channel should maintain well to ensure proper function.
|
The contractor
has improved the U-channel condition to ensure proper function.
|
10-Apr-21
|
|
15-Apr-21
|
Water Quality
|
The contractor
was reminded the drainage system and wastewater treatment facility should be
well-maintained to ensure proper function.
|
The contractor
has cleaned the drainage channel and provide regularly cleaning for
wastewater treatment facility.
|
19-Apr-21
|
|
15-Apr-21
|
Air Quality
|
The contractor
was reminded that the stockpile should be fully covered / removed from site
when not in use.
|
The stockpile
was fully covered.
|
15-Apr-21
|
|
22-Apr-21
|
Noise
|
The contractor
was reminded to erect noise screen at proper direction to minimise noise
impact to the noise sensitive receiver.
|
The contractor
has erected the noise screen properly at proper direction (which facing the
noise sensitive receiver).
|
24-Apr-21
|
|
28-Apr-21
|
Waste
Management
|
The contractor
was reminded to clean the drip tray regularly to prevent chemical leakage to
the ground.
|
The contractor
has cleaned the drip tray.
|
29-Apr-21
|
|
28-Apr-21
|
Air Quality
|
The contractor was reminded the cement bags which over 20 bags should
fully cover with tarpaulin
|
The contractor
has fully covered the cement bags with tarpaulin.
|
28-Apr-21
|
|
28-Apr-21
|
Air Quality
|
The contractor
was reminded to check/maintain the plant regularly to minimize generation of
dark smoke emission.
|
The contractor
has checked the plant and changed the diesel filter to minimize generation of
dark smoke emission.
|
29-Apr-21
|
|
28-Apr-21
|
Water Quality
|
The contractor
was reminded to keep the dusty stockpile away from the U-channel to prevent
dusty materials wash into the U-channel.
|
The contractor
has moved away the dusty stockpile from the U-channel.
|
30-Apr-21
|
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, 307.23 tonnes,
5791.48 tonnes of inert C&D material were disposed of as public fill to
Tseung Kwan O Area 137 Public Fill, and Tuen Mun Area 38 Public Fill
respectively, while 19.29 tonnes of general refuse were disposed of at SENT
landfill. 0.00 tonne of metals, 0.0 tonne of paper/cardboard packaging, 0.0
tonne of plastics and 0.0 tonne of timber was collected by recycling
contractors in the reporting month. 0.0 tonnes of inert C&D material were
reused on site. 1109.51 tonne of inert C&D material were reused in other
projects and 0.0 tonnes of inert C&D material was imported for reuse at
site in the reporting month. 0.0 tonne of inert C&D material was disposed
to sorting facility and 0.40 tonnes 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-RE-0159-21
|
11-Mar-21
|
10-Jul-21
|
Valid
|
Piling Works
|
|
Wastewater
Discharge License
|
|
WT00037344-2021
|
01-Feb-21
|
28-Feb-26
|
Valid
|
--
|
|
Notification
under Air Pollution Control (Construction Dust) Regulation
|
|
456376
|
21-May-20
|
--
|
Notified
|
--
|
|
Permit
to Dump Material at sea under Dumping at Sea Ordinance
|
|
461895
|
--
|
--
|
Under EPD Approval
|
--
|
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 and main haul road.
– Stockpile
should be fully covered when not in use or removed from the site.
– Plant/equipment
shall check regularly to minimise dark smoke emission.
Noise
Control
– Provide more noise barrier to cover the plant as far as possible to
minimise construction noise impact.
– Noise barrier shall be set at proper direction to minimise noise impact to the nearby noise
sensitive receiver.
Temporary
Water Drainage System & Water Quality
– The temporary drainage system should be well managed and updated
with the site condition.
– U-channel should be cleaned regularly.
– The
water treatment facilities should be cleaned regularly to maintain proper
function.
– Dusty
stockpile should keep away from U-channel to prevent dusty material wash into
the drainage system.
Waste
Management
–
The drip tray should be cleaned
regularly to prevent chemical leakage to the ground.
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 3.4
|
Monthly EM&A Report for February 2021
|
13 April 2021
|
There was no breach of Action or Limit Levels for Air Quality in the
reporting month.
One Action Level exceedance due to one complaint (related to Zone 2A) with
no Limit Level exceedance of construction noise was recorded in the reporting
month.
6.2
Record on Environmental
Complaints Received
Two
environmental complaint was recorded in the reporting month.
One
environmental complaint case referred by Home Affair Bureau (HAB) on the noise
disturbance at WKCD construction site was received on 12 April 2021. The
complainant claimed that construction noise was heard at the construction site
close to Xiqu Centre after 20:00.
After
carrying out the investigation with the contractor, it
is deemed that the noise source could be from the RCD
machine and associated power pack set on Zone 2A-2 site. Thus, the complaint could
be attributable to Zone 2A site. During the construction works at night (i.e.
19:00 to 22:00) on 7 to 10 April and 12 April, one single group process was
used and all work process complied with the permitted time (19:00 - 23:00).
Prompt actions have been taken to enhance the noise control measures after
reception of the complaint. Moreover, existing noise control measures have been
properly maintained on site (through trainings, noise barrier erection, noise
measurement and monitoring with no exceedance). However, the Contractor is recommended
to maintain good practices for site management and continual improvement of
noise control measures in order to minimize disturbance to site neighbours.
The
other environmental complaint was referred by EPD. On 18 April 2021, EPD has
received a complaint from a resident of The Arch relating to WKCD construction
site activities. According to email sent by EPD on 20 April 2021, the
complainant claimed that there was a noise from construction site of Zone 2A,
including the engine of lorry after 00:00 hrs on 15 and 16 April 2021.
After
carrying out the investigation with the contractors, it is revealed that only RCD works had been found out and
conducted in night from 19:00 to 22:00 within the Zone 2A site on 15 and 16
April 2021. Construction activity, material transportation / delivery or lorry
traffic could not be found out after midnight (after 00:00) within the Zone 2A
site on 15 and 16 April 2021.Thereby, the complaint might not be attributable
to the Zone 2A site. However, the Contractor has been reminded to properly
maintain noise mitigation measures on site to avoid disturbance to nearby
residents.
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.
Zone 2A-1
● Grouting Works (Trial 1)
– Post
Drilling
– Install
Pump Wells
– Pumping
Test
● Grouting Works (Trial 2)
– Pumping
Test
● ELS
(Stage 1) – Grouting / Pipe Pile Works
– King
Post
● Socketed H-Pile Works
– Remaining Socket H-Pile Works
● Bored Pile Works
– Bored Pile Construction
Zone 2A-2
● Bored Pile Works
–
Additional Bored Pile Construction
● ELS (Stage 1) – Grouting / Pipe Pile Works
– Stage
1a & 1b Grouting
– Pipe
Pile Construction
Key issues to be considered in
the coming month include:
● Generation of dust from
construction works;
● Noise impact from piling works;
● Generation of site surface
runoffs and wastewater from activities on-site;
● The temporary drainage system should
be well managed and updated with the site condition, particularly on rainy
days;
● 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 or Limit levels for Air Quality
(1-hour TSP and 24-hour TSP) in this reporting month. One Action Level exceedance due to
one complaint with no Limit Level exceedance of construction noise was recorded
in the reporting month.
Two environmental complaint was
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.
