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|
Author signature |
|
Certified by |
|
|
Name |
Alvin Yip |
Name |
F. C. Tsang |
|
Title |
Environmental Team Consultant |
Title |
Environmental Team Leader |
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Contents
1.2 Construction Works Programme
1.4 Construction Works Programme and Construction Works Area
1.5 Works undertaken during the Period
2.3 Monitoring Parameter and Frequency
2.4 Action and Limit Level for Water Quality Monitoring
2.7 Quarterly Assessment of Construction Impacts on Suspended Solids at the Project Site
3.2 Noise Monitoring Parameter, Frequency and Duration
9 Environmental Site Inspection and Audit
9.1 Implementation Status of Environmental Mitigation Measures
10 Summary of Monitoring Exceedance, Complaints, Notification of Summons and Prosecutions
10.2 Summary of Environmental Non-Compliance. 15
10.3 Summary of Environmental Complaint
10.4 Summary of Environmental Summon and Successful Prosecution
11 Conclusions and Recommendations
11.2 Comments/ Recommendations
Appendices
Appendix
1.1 Construction Programme
Appendix
1.2 Project Organization Chart
Appendix
2.1 Event and Action Plans for Water Quality
Appendix
2.2 Graphical Presentation of Water Quality Monitoring
Appendix
3.1 Event and Action Plans for Noise
Appendix
3.2 Graphical Presentation of Noise Monitoring
Figures
Figure 1.2.. Location of Work
Areas for the Project
Figure 2.1.. Impact Water Quality
Monitoring Locations
Figure 3.1.. Impact Noise
Monitoring Locations
Figure 8.1.. Area for Archaeological Survey
Figure 8.3.. Monitoring Locations of Lan Fong Study Hall at Ha Che
Executive Summary
A1. Drainage Services Department (DSD) has appointed Aurecon Hong Kong Limited (Aurecon) to undertake the Environmental Team services for the project and implement the EM&A works.
A2. The construction works commenced on 20 February 2024.
A3. This 6th Quarterly Environmental Monitoring and Audit (EM&A) Report is prepared for Contract No. DC/2022/02 Drainage Improvement Works at Yuen Long – Stage 2 (hereinafter called the “Contract”). The report summaries the findings of the EM&A programme during the reporting period from 1 May 2025 to 31 July 2025.
Key Construction Works in the
Reporting Period
A4. A summary of construction activities undertaken during the reporting period is presented below:
Ha Che
§ Site clearance;
§ Breaking ground;
§ Temporary drainage diversion;
§ Excavation and Lateral Support, relocate/ divert utilities, rebar fixing, formwork erection and cast-in, concreting;
§ Sheet pilling & backfilling and compaction; and
§ Removal of sheet piles, drain laying works, reinstatement.
Lin Fa Tei
§ Site clearance;
§ Breaking ground;
§ Temporary drainage diversion;
§ Excavation and Lateral Support, relocate/ divert utilities, rebar fixing, formwork erection and cast-in, concreting; and
§ Sheet pilling & backfilling and compaction;
§ Removal of sheet piles, drain laying works, reinstatement.
Sung Shan New Village
§ Site clearance;
§ Temporary drainage diversion;
§ Excavation and Lateral Support, relocate/ divert utilities, rebar fixing, formwork erection and cast-in, concreting;
§ Sheet pilling & backfilling and compaction; and
§ Removal of sheet piles, drain laying works, reinstatement.
Tai Wo
§ No construction activities
Breaches of Environmental Quality
Performance Limits
Water Quality
A5. No Action Level or Limit Level exceedance was recorded for water quality monitoring during the reporting period.
Noise
A6. No Action Level or Limit Level exceedance was recorded for construction noise monitoring during the reporting period.
Built Heritage
A7. No monitoring exceedance was recorded in the reporting period.
Complaint Log
A8. No environmental complaint was received in the reporting period.
Notification of Summons and
Successful Prosecutions
A9. No notification of summons or successful prosecutions was received in the reporting period.
Reporting Changes
A10. Construction works at Tai Wo are only allowed during dry season (i.e. October
to March) in accordance with Condition 3.2 of EP No. EP-596/2021. Thus, the
construction EM&A programme at Tai Wo, including impact water quality
monitoring, impact noise monitoring and weekly inspection, are temporarily
suspended during the reporting period.
1
Introduction
1.1
Project
Background
1.1.1 The Drainage Master
Plan Studies for the Yuen Long, Kam Tin, Ngau Tam Mei and Tin Shui Wai Drainage
Basin (YLDMP) were completed in 1998. The majority of the improvement
works in Yuen Long and Kam Tin recommended under the YLDMP Study have been
completed. Since completion of the DMP Studies, there have been changes in
developments within the areas and new development proposals and town planning
studies were commissioned. In addition, some new flooding complaints were
received at the upstream areas of the drainage basins, indicating that further
improvement to the drainage systems was required.
1.1.2 The Drainage Services Department
(DSD) commissioned the “Review of Drainage Master Plans in Yuen Long and North
Districts – Feasibility Study” (the Review Study) in 2008 so that the new
development scenarios could be incorporated and the effectiveness of
the previously recommended works could also be assessed. The Review Study
completed in end 2011 identified that some areas in Yuen Long District could
not meet the required flood protection level according to the latest land use
changes and future developments taking into account various factors, including
sedimentation at the downstream main channels, mangrove growth at river
estuaries, updated extreme sea level statistics at Tsim Bei Tsui and
projected climate change impacts, in the hydraulic analysis. To account for the
severity and extent of possible flooding and the works implementation time, the
Review Study proposed drainage improvement works in Yuen Long District.
1.1.3 Atkins China Ltd (ACL) was
commissioned by the DSD in November 2013 to undertake an Investigation, Design
and Construction Consultancy entitled “Agreement No. CE 22/2013 (DS) Drainage
Improvement Works in Yuen Long, Stage 1 – Investigation, Design and Construction”
(hereinafter called the Assignment). The Project comprises construction of
drainage improvement works to four villages (namely Sung Shan New Village, Tai
Wo, Lin Fa Tei and Ha Che) including landscaping, waterscaping, utilities diversion, temporary traffic
arrangements, re-provisioning / improvements to existing dry weather flow
intercepting system and any other works incidental to the completion of the
Project.
1.1.4 An Environmental Impact Assessment
(EIA) Study Brief (ESB-279/2014) for four villages namely Ha Che, Tai Wo, Lin
Fa Tei and Sung Shan New Village which is a designated project was
issued by the Environmental Protection Department (EPD) on 14 October 2014.
1.1.5 The EIA Report for Drainage
Improvement Works Near Four Villages in Yuen Long – Sung Shan New Village, Tai
Wo, Lin Fa Tei and Ha Che (referred to as “the Project”) (Register No.
AEIAR-229/2021) was approved on 3 June 2021 and the Environmental Permit (EP)
EP-596/2021, covering the Upgrading, Construction and Deepening of the Project
was granted on 28 September 2021.
1.1.6
Aurecon Hong Kong Limited
(Aurecon) is commissioned by the Wing Tat Civil Engineering Co. Limited to
undertake the Environmental Team (ET) services and carry out the Environmental
Monitoring and Audit (EM&A) for Drainage Improvement Works Near Four
Villages in Yuen Long - Sung Shan New Village, Tai Wo, Lin Fa Tei and Ha Che
(Register No. EP-596/2021).
1.1.7
This is the 6th
Quarterly EM&A Report summarizing the key
findings of the construction phase EM&A programme from 1 May 2025 to 31 July
2025 (the reporting period) and is submitted to fulfil the requirements in
Section 12.3 of the approved Updated EM&A Manual of the Project.
1.2
Construction
Works Programme
1.2.1 The construction programme and the
location plan of the Project are shown in Appendix 1.1 and Figure 1.1 respectively. The locations of the
proposed drainage improvement work at the four villages are presented in Figures 1.2a
to Figures 1.2d.
1.3
Project
Organisation
1.3.1 Involvement of relevant parties in
a collaborative and interactive manner is essential for the implementation of
the recommended EM&A programme. The following sections outline the primary
responsibilities and duties of the key EM&A programme participants. The
lines of communication with respect to EM&A works are shown in Diagram 1.1.
%20R1_files/image006.jpg)
Diagram 1.1 Organisation Chart
1.3.2 Parties with different levels of
involvement in the Project organisation are summarized in Table 1.1.
Table 1.1 Parties Involved in Project Organisation
|
Parties |
Organization / Company |
|
Project Proponent |
Drainage Services Department |
|
Supervisor / Engineer’s Representative (ER) |
Atkins China Ltd |
|
Contractor |
Wing Tat Civil Engineering Co. Limited |
|
Environmental Team (ET) |
Aurecon Hong Kong Limited |
|
Independent Environmental Checker (IEC) |
Mott MacDonald Hong Kong Limited |
1.3.3
The key personnel
contact names and numbers are summarized in Appendix 1.2.
1.4
Construction
Works Programme and Construction Works Area
1.4.1 The construction works commenced on
20 February 2024. The construction works programme and the construction works
area of the Project are shown in Appendix 1.1
and Figure 1.1 respectively.
1.5
Works
undertaken during the Period
1.5.1
The main
construction works carried out in the reporting period were as below.
§ Site clearance; work
§ Breaking ground
§ Temporary drainage diversion
§ Excavation and Lateral Support, relocate/ divert utilities, rebar fixing, formwork erection and cast-in, concreting
§ Sheet pilling & backfilling and compaction; and
§ Removal of sheet piles, drain laying works, reinstatement.
Lin Fa Tei
§ Site clearance work
§ Breaking ground
§ Temporary drainage diversion
§ Excavation and Lateral Support, relocate/ divert utilities, rebar fixing, formwork erection and cast-in, concreting; and
§ Sheet pilling & backfilling and compaction
§ Removal of sheet piles, drain laying
works, reinstatement.
Sung Shan New Village
§ Site clearance work
§ Temporary drainage diversion
§ Excavation and Lateral Support, relocate/ divert utilities, rebar fixing, formwork erection and cast-in, concreting
§ Sheet pilling & backfilling and compaction; and
§ Removal of sheet piles, drain laying works, reinstatement.
Tai Wo
§ No construction activities
1.5.2 The
environmental mitigation measures corresponding to the main construction works
implemented in the reporting period can be referred to Appendix 1.3.
2
Water
Quality
2.1
Monitoring
Requirement
2.1.1
In accordance with
the approved Updated EM&A Manual, impact water quality monitoring should be
carried out three days per week at all designated monitoring stations during
the construction period. The interval between two sets of monitoring should
not be less than 36 hours.
2.1.2
Replicate in-situ
measurements of dissolved oxygen (DO), temperature, pH, turbidity, salinity,
water depth and suspended solids (SS) for each independent sampling event shall
be collected to ensure a robust statistically interpretable database.
2.2
Monitoring
Location
2.2.1
Impact water
quality monitoring was conducted at 8 monitoring stations (except Station C4
& C5) during the reporting period which is summarized in Table 2.1. The location of water quality
monitoring stations is shown in Figure 2.1a to Figure 2.1d.
Table 2.1 Summary of Impact Water Quality Monitoring Stations
|
Stream |
Monitoring ID |
Coordinates (HK Grid) |
Remarks |
|
|
Easting |
Northing |
|||
|
SSNV |
C1A (1) |
821702 |
831945 |
Alternative Impact Monitoring Point |
|
C2 |
822459 |
831470 |
Control Monitoring Point |
|
|
C3A (2) |
822413 |
831284 |
Alternative Control Monitoring Point |
|
|
TW |
C4 (4) |
825497 |
830664 |
Control Monitoring Point |
|
C5 (4) |
825486 |
830716 |
Impact Monitoring Point |
|
|
LFT |
C6 |
827232 |
831713 |
Control Monitoring Point |
|
C7A (3) |
826865 |
832115 |
Alternative Control Monitoring Point |
|
|
C8 |
826513 |
832075 |
Impact Monitoring Point |
|
|
HC |
C9 |
828304 |
835029 |
Control Monitoring Point |
|
C10 |
827919 |
834271 |
Impact Monitoring Point |
|
Notes:
(1) At Station C1, access to safe sampling of water is not feasible due to steep banks on both sides of the stream channel. An alternative monitoring location is proposed at Station C1A, which is about 250 m along the same stream channel downstream of Station C1 and is accessible for safe water sampling.
(2) During the first day of baseline monitoring at Station C3, shallow water was observed, and the ET could not sample enough water for monitoring. As agreed by the ER, the Contractor, and the IEC, a new sampling location, Station C3A, was identified at about 130 m upstream and was accessible for water sampling.
(3) For Station C7, the location is not close to the nearest, revised works boundary (about 200 m away). An alternative monitoring location is proposed at Station C7A, which is about 23 m upstream of the nearest, revised works boundary.
(4) Construction works at Tai Wo are only allowed during dry season (i.e. October to March) in accordance with Condition 3.2 of EP No. EP-596/2021. Thus, impact water quality monitoring at these stations was temporarily suspended during the reporting period.
2.3
Monitoring
Parameter and Frequency
2.3.1 The monitoring parameters, frequency
and duration of impact water quality monitoring are listed in Table 2.2.
Table 2.2 Parameters measured in the Impact Water Quality Monitoring
|
Parameter |
Frequency |
Duration |
Stream |
Monitoring ID |
|
Dissolved oxygen (DO), temperature, turbidity, salinity, pH, stream water depth and suspended solids (SS) |
1 day in a week (1) |
Throughout the construction phase |
SSNV |
C1A |
|
C2 |
||||
|
C3A |
||||
|
LFT |
C6 |
|||
|
C7A |
||||
|
C8 |
||||
|
HC |
C9 |
|||
|
C10 |
||||
|
3 days in a week |
TW(2) |
C4 |
||
|
C5 |
Notes:
(1) Impact monitoring shall be carried out 3 days per week during the construction process. The monitoring frequency can be reduced to once per week, with sampling/ measurement at the designated monitoring locations when no exceedances were recorded during the past three-month period in accordance with Section 2.7, Appendix 4 of the Updated EM&A Manual. The change of the monitoring frequency at SSNV, LFT and HC was approved by EPD on 25 November 2024. Hence, the monitoring frequency at SSNV, LFT and HC was changed to 1 day in a week starting from 2 December 2024.
(2) No construction work would be undertaken at Tai Wo between April and September under Condition 3.2 of EP No.: EP-596/2021. Thus, impact water quality monitoring at C4 and C5 was suspended during the reporting period.
2.3.2 Monitoring
location and position, time, sampling depth, weather conditions and any special
phenomena or work underway nearby are recorded during the impact monitoring.
2.4
Action
and Limit Level for Water Quality Monitoring
2.4.1 The criteria of action and limit
levels for water quality monitoring are defined in Table 2.3.
Table 2.3 Action and Limit Levels for Water Quality
|
Parameters |
Action Level |
Limit Level |
|
DO in mg/L |
< 5%-ile of baseline data |
< 4 mg/L or < 1%-ile of baseline data |
|
SS in mg/L |
> 95%-ile of baseline data or >120% of upstream control station of the same day, whichever is higher |
> 99%-ile of baseline data or 130% of upstream control station of the same day, whichever is higher |
|
Turbidity in NTU |
> 95%-ile of baseline data or >120% of upstream control station of the same day, whichever is higher |
> 99%-ile of baseline data or > 130% of upstream control station of the same day, whichever is higher |
Note:
(1) For DO, non-compliance of the water quality limit occurs when monitoring result is lower than the limit.
(2) For SS and turbidity, non-compliance of the water quality limit occurs when monitoring result is higher than the limit.
(3) All the figures given in the table are used for reference only and the EPD may amend the figures whenever it is considered necessary.
2.4.2 Based on the criteria listed in Table 2.3, the action and limit levels for
water quality are determined in Table 2.4.
Table 2.4 Action and Limit Levels of Water Quality
|
Monitoring ID |
Parameters |
Action |
Limit |
|
|
SSNV |
C1A |
DO in mg/L |
<6.72 |
<4 (1) |
|
SS in mg/L |
>7.3 or >120% of upstream control station of the same day, whichever is higher |
>8.5 or > 130% of upstream control station of the same day, whichever is higher |
||
|
Turbidity in NTU |
>10.37 or >120% of upstream control station of the same day, whichever is higher |
>10.81 or > 130% of upstream control station of the same day, whichever is higher |
||
|
TW |
C5 |
DO in mg/L |
<8.36 |
<4 (2) |
|
SS in mg/L |
>9.9 or > 120% of upstream control station of the same day, whichever is higher |
>10.0 or > 130% of upstream control station of the same day, whichever is higher |
||
|
Turbidity in NTU |
>13.64 or > 120% of upstream control station of the same day, whichever is higher |
>13.87 or > 130% of upstream control station of the same day, whichever is higher |
||
|
LFT |
C8 |
DO in mg/L |
<5.38 |
<4 (3) |
|
SS in mg/L |
>6.3 or > 120% of upstream control station of the same day, whichever is higher |
>7.0 or > 130% of upstream control station of the same day, whichever is higher |
||
|
Turbidity in NTU |
>12.46 or > 120% of upstream control station of the same day, whichever is higher |
>12.94 or > 130% of upstream control station of the same day, whichever is higher |
||
|
HC |
C10 |
DO in mg/L |
<2.55 |
<2.43 (4) |
|
SS in mg/L |
>8.7 or > 120% of upstream control station of the same day, whichever is higher |
>8.8 or > 130% of upstream control station of the same day, whichever is higher |
||
|
Turbidity in NTU |
>20.06 or > 120% of upstream control station of the same day, whichever is higher |
>21.07 or > 130% of upstream control station of the same day, whichever is higher |
(1) The 1%-ile of baseline DO data at C1A is 6.61 mg/L, which is higher than 4 mg/L. Thus, DO concentration of 4 mg/L, which is in line with the Water Quality Objectives, is adopted as the limit level.
(2) The 1%-ile of baseline DO data at C5 is 8.09 mg/L, which is higher than 4 mg/L. Thus, DO concentration of 4 mg/L, which is in line with the Water Quality Objectives, is adopted as the limit level.
(3) The 1%-ile of baseline DO data at C8 is 5.36 mg/L, which is higher than 4 mg/L. Thus, DO concentration of 4 mg/L, which is in line with the Water Quality Objectives, is adopted as the limit level.
(4) The 1%-ile of baseline DO data at C10 is 2.43 mg/L, which is lower than 4 mg/L. Taking account of the baseline water quality condition and to minimise any false alarm of water quality deterioration during construction phase, DO concentration of 2.43 mg/L is adopted as the limit level.
2.5
Event
and Action Plan
2.5.1
Should any non-compliance
of the criteria occur, action in accordance with the Event and Action Plan in Appendix 2.1 shall be followed. Investigation
of the exceedances of environmental quality performance limits should be
conducted, and the ET will immediately notify the IEC and EPD, as
appropriate. The notification should be followed up with advice to the
IEC and EPD on the results of the investigation, proposed actions and success
of the action taken, with any necessary follow-up proposals.
2.6
Results
and Observations
2.6.1 The detailed monitoring results
during the reporting period are reported in the monthly EM&A Reports. The
graphical presentation of water quality monitoring at the monitoring stations
are shown in Appendix 2.2.
2.6.2
No exceedance of
impact water quality monitoring was recorded during the reporting period. The
summary of exceedance records of water quality monitoring during the reporting
period is summarized in Table 2.5.
Table 2.5 Summary of Exceedance Records of Water Quality Monitoring
|
Parameter |
No. of non-project related exceedances |
Total No. of non-project related exceedances |
No. of exceedance related to the Project |
Total No. of exceedance related to the Project |
||
|
AL |
LL |
AL |
LL |
|||
|
Dissolved Oxygen |
0 |
0 |
0 |
0 |
0 |
0 |
|
Turbidity |
0 |
0 |
0 |
0 |
0 |
0 |
|
Suspended Solids |
0 |
0 |
0 |
0 |
0 |
0 |
2.7
Quarterly
Assessment of Construction Impacts on Suspended Solids at the Project Site
2.7.1 The
comparison of the difference between the quarterly mean and 1.3 times of the
ambient mean is presented in Table 2.6.
Table 2.6 Comparison of the difference between the quarterly mean and 1.3 times of the ambient mean
|
Parameter |
Monitoring Location |
Quarterly Mean of SS (mg/L) |
Baseline Level of SS (mg/L) |
1.3 Times of Ambient Mean (mg/L) (1) |
Quarterly Mean of SS > 1.3 Times of Ambient Mean (Y/N) |
Request of Further Mitigation Measures (Y/N) |
|
Suspended Solids |
C1A |
4.4 |
4.8 |
6.2 |
N |
N |
|
C2 (Control Point) |
6.5 |
3.2 |
4.2 |
Y |
N/A |
|
|
C3A (Control Point) |
5.4 |
2.2 |
2.9 |
Y |
N/A |
|
|
C6 (Control Point) |
11.5 |
3.7 |
4.8 |
Y |
N/A |
|
|
C7A (Control Point) |
4.6 |
6.7 |
8.7 |
N |
N/A |
|
|
C8 |
2.5 |
4.0 |
5.2 |
N |
N |
|
|
C9 (Control Point) |
7.6 |
5.9 |
7.7 |
N |
N/A |
|
|
C10 |
3.6 |
8.5 |
11.1 |
N |
N |
Note:
(1) 1.3 times of the ambient mean equal to be defined as 30% increase of the baseline data.
Sung Shan New Village (Monitoring Locations C1A, C2 & C3A)
2.7.2 The
quarterly mean of SS at Monitoring Location C1A (Impact Point) (4.4 mg/L) is
lower than the 1.3 times of the ambient mean (6.2 mg/L). Hence, no further
mitigation measures for control of water quality impact are required at Sung
Shan New Village.
Lin Fa Tei (Monitoring Locations C6, C7A & C8)
2.7.3 The
quarterly mean of SS at Monitoring Location C8 (Impact Point) (2.5 mg/L) is
lower than the 1.3 times of the ambient mean (5.2 mg/L). Hence, no further
mitigation measures for control of water quality impact are required at Lin Fa
Tei.
Ha Che (Monitoring Locations C9 & C10)
2.7.4 The
quarterly mean of SS at Monitoring Location C10 (Impact Point) (3.6 mg/L) is
lower than the 1.3 times of the ambient mean (11.1 mg/L). Hence, no further
mitigation measures for control of water quality impact are required at Ha Che.
3
Noise
3.1
Monitoring
Locations
3.1.1 The monitoring locations for
construction noise monitoring are listed in Table 3.1 and shown in Figure 3.1a
to Figure 3.1d.
Table 3.1 Noise Monitoring Stations during Construction Phase
|
ID No. (1) |
Location |
Nature of Uses |
Type of Measurement |
|
SSNV_M2 |
Village house next to a nullah in Tong Tai Po Tsuen (near DD118 1720 S.A) |
Residential |
Façade |
|
SSNV_M3 |
Village house near a soybean sauce factory in Sung Shan New Village (near DD118 1712) |
Residential |
Façade |
|
SSNV_M6 |
#43, Sung Shan New Village |
Residential |
Free-field |
|
TW_M2 (4) |
#200, Cheung Po |
Residential |
Free-field |
|
TW_M3 (4) |
Kai Yip Garden, #3H, Tai Wo |
Residential |
Free-field |
|
LFT_M1 |
#2G, Lin Fa Tei |
Residential |
Façade |
|
LFT_M3A (2) |
Near #125B, Lin Fa Tei |
Residential |
Free-field |
|
LFT_M5 |
#156B, Lin Fa Tei |
Residential |
Façade |
|
LFT_M6 (3) |
Village house near the nullah (DD112 699 S.E) |
Residential |
Façade |
|
LFT_M11 (2) |
#210, Ngau Keng Tsuen |
Residential |
Façade |
|
HC_M3A (2) |
Next to DD111 326 S.B RP near Fan Kam Road |
- |
Free-field |
|
HC_M4 |
#1C, Chuk Hang |
Residential |
Façade |
|
HC_M6 |
The Arbutus House 12, #52, Shui Kan Shek |
Residential |
Façade |
Notes:
(1) SSNV – Sung Shan New Village; TW – Tai Wo; LFT – Lin Fa Tei; HC – Ha Che.
(2) LFT_M3A, LFT_M11, HC_M3A and are alternative noise monitoring stations proposed to replace LFT_M3, LFT_M13 and HC_M3, respectively.
(3) Due to the objection from property management office for providing access to designated monitoring location, the noise monitoring at LFT_M7 have been suspended since 27 March 2024. An alternative monitoring location LFT_M6 was proposed to replace LFT_M7 and agreed with the ER and the IEC.
(4) Construction works at Tai Wo are only allowed during dry season (i.e. October to March) in accordance with Condition 3.2 of EP No. EP-596/2021. Thus, impact noise monitoring at TW_M2 and TW_M3 was suspended during the reporting period.
3.2
Noise
Monitoring Parameter, Frequency and Duration
3.2.1 Construction
noise level was measured by the ET and measured in terms of the A-weighted
equivalent continuous sound pressure level (Leq).
Leq(30mins) used as the
monitoring parameter for the construction noise monitoring. The monitoring
should be conducted during the construction phase between 0700 and 1900 on
normal weekdays at the designated monitoring locations.
3.2.2 As
supplementary information for data auditing, statistical results such as L10
and L90 were also obtained for reference.
3.2.3 Table 3.2
summarizes the monitoring parameters, duration, and frequency of construction
noise monitoring.
Table 3.2 Construction Noise Monitoring Parameter, Frequency and Duration
|
Monitoring Station |
Parameter |
Frequency and Duration |
|
SSNV_M2, SSNV_M3, SSNV_M6, HC_M3A, HC_M4, HC_M6, TW_M2, TW_M3, LFT_M1, LFT_M3A, LFT_M5, LFT_M6 and LFT_M11 |
Leq(30mins) (as a logarithmic average of 6 consecutive Leq(5mins)) |
Once every week throughout the construction phase between 0700 and 1900 on normal weekdays |
3.3
Action
and Limit Levels
3.3.1 The Action and Limit levels were
established in accordance with the approved Updated EM&A Manual. Table 3.3 presents the Action and Limit
Levels for construction noise. Should non-compliance of the criteria occur,
action in accordance with the Event and Action Plan presented in Appendix 3.1
shall be carried out.
Table 3.3 Action and Limit Levels for Construction Noise Monitoring
|
Time Period |
Action |
Limit Level |
|
07:00 – 19:00 on normal weekdays |
When one or more documented complaints are received |
75 dB(A)(1) |
|
07:00 – 23:00 on holidays; and 19:00 – 23:00 on all other days |
45 dB(A)(2) |
|
|
23:00 – 07:00 of the next day |
30 dB(A)(2) |
Notes:
(1) Between 07:00 and 19:00, construction noise limit for school during normal term time is 70 dB(A) and 65 dB(A) during examination period.
(2) The ASR of identified noise sensitive receivers is “A”, which is a rural area that is not affected by the in Influencing Factors (Ifs). The limit levels are stipulated in the Technical Memorandum on Noise from Construction Work in Designated Areas.
3.4
Results
and Observations
3.4.1 The detailed monitoring results
during the reporting period are reported in the monthly EM&A Reports. The
graphical presentation of noise monitoring at the monitoring stations are shown
in Appendix 3.2.
3.4.2
No Action or Limit
levels exceedance was recorded in the reporting period.
4
Ecology
4.1
Freshwater
Crab
4.1.1 With reference to the approved EIA Report
(Register No.: AEIAR-229/2021), two freshwater crab species of conservation
importance were recorded within the work sites during the ecological baseline
survey. Somanniathelphusa zanklon was recorded at Lin Fa Tei and Ha Che, while Cryptopotamon anacoluthon was recorded in the
upstream area at Ha Che. Both species are endemic to Hong Kong and considered
to be “Endangered” and “Vulnerable” by the IUCN respectively (IUCN 2023). The
construction activities of the project will disturb their natural habitats and
potentially causing a direct loss of these two species due to their limited
mobility.
Post-translocation Monitoring
4.1.2 According
to Section 5.2.5 of the approved Updated EM&A Manual for the Project,
monthly post-translocation monitoring shall be conducted for at least 12 months
after pre-construction surveys to monitor their establishment. The tentative
capture and monitoring schedule and progress of the pre-construction and
post-translocation surveys are summarized in Table 4.1.
Table 4.1 Tentative Construction
Schedule and Scheduled Capture and Monitoring at Ha Che and Lin Fa Tei
|
Works Location |
2024 |
2025 |
2026 |
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|
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
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Ha Che |
CH.A11.13~ CH.A300.00 |
20/2/2024 – 7/12/2024 |
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✓ |
O |
O |
O |
O |
O |
O |
O |
O |
O |
O |
O |
O |
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CH.A300.00~ CH.A653.949 |
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23/9/2024 – 19/11/2025 |
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✓ |
O |
O |
O |
O |
O |
O |
O |
O |
O |
O |
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CH A653.949~ CH.A905.63 |
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26/3/2026 – tbc |
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Lin Fa Tei |
CH.A818.86~ CH.A500.00 |
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16/5/2025 – to be confirmed |
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* |
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CH.A200.00~ CH.A500.00 |
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29/4/2024- 18/1/2025 |
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* |
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CH.A0.00~ CH.A200.00 |
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20/3/2024 – 11/1/2025 |
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✓ |
O |
O |
O |
O |
O |
O |
O |
O |
O |
O |
O |
O |
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CH.B0.00~ CH.B149.77 |
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29/4/2024 – 20/2/2025 |
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* |
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CH.C117.50~ CH.D239.03 |
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20/3/2024 – 21/8/2025 |
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* |
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Notes: Cells in Orange = Scheduled Pre-construction Survey; Cells in Blue = Scheduled Post-translocation Monitoring; Cells in Green = Tentative Construction Schedule given in January 2024; ✓ = Survey Completed with translocated crabs, * = Survey completed without crabs translocated, O = Post-translocation Monitoring Completed
4.1.3 During
the monitoring, active visual search by hand netting and kick sampling for
aquatic fauna species would be performed at the respective receptor sites.
Potential micro-habitats and hiding spaces that is favoured by the crabs such
as rocks, organic debris, leaf litter, and riparian vegetation etc., will also
be overturned or raked.
4.1.4 Upon
discovery of any marked individuals from the pre-construction survey, date and
time of capture, size and health condition of the individual will also be
recorded once again.
4.1.5 The
practice of mark and recapture of the translocated population of S. zanklon and C. anacoluthon at the receptor site
can then be used to estimate population size, as well as inform the health and
survival status of the translocated population.
4.1.6 Post-translocation
Monitoring was carried out in the reporting period. The monitoring results are
reported in the monthly EM&A Reports prepared for this Contract.
4.1.7 None
of the translocated individuals from the pre-construction survey was found in
the upper and lower receptor sites of Ha Che during the reporting period. The
inability to recapture the translocated individuals could be due to the
structural complexity of the habitats of both sites. Given the presence
of many rocks and riffles at the Upper Ha Che receptor site, together with
large and deep pools in the Lower Ha Che receptor site, these receptors sites
provide excellent refuge and protection for the crabs.
5
Waste
Management
5.1.1
Waste generated
from the Project include inert construction and demolition (C&D) materials
and non-inert C&D wastes in the reporting period. The amount of waste
generated by the construction works of the Project during the reporting period
are shown in Appendix 5.1.
5.1.2
Sorting of
construction and demolition (C&D) materials was carried out on site.
Sufficient numbers of receptacles were provided for general refuse collection
and sorting. Excavated inert C&D materials were reused to minimize
the disposal of C&D waste to public fill.
5.1.3
The Contractor is
advised to minimize the wastes generated through recycling or reusing.
All applicable mitigation measures stipulated in the approved Updated EM&A
Manual and waste management plans will be fully implemented.
6
Land
Contamination
6.1.1 With reference to results of land
contamination assessment included in the approved EIA Report (Register No.:
AEIAR-229/2021), all identified sites with potential contamination are located
outside the work area of the Project and no potential contamination arising
from the proposed drainage improvement works is anticipated. Therefore, no land
contamination issue is anticipated for this Project.
6.1.2 Mitigation measures listed in Appendix 1.3 should be adopted if any suspended
contamination encountered during construction.
6.1.3 No suspected on-site contamination
was observed or reported by the Contractor in the reporting period.
7
Landscape
and Visual
7.1
Audit
Requirements
7.1.1 According to the approved Updated
EM&A Manual, site audits should be undertaken every week during the
construction phase to check that the proposed landscape and visual mitigation
measures are properly implemented and maintained as per their intended
objectives. Mitigation measures recommended in the EIA Report as the audit
requirements including, preservation of existing vegetation, transplanting of
affected trees, compensatory tree planting, control of night-time lighting
glare, erection of decorative screen hoarding and management of construction
activities and facilities are summarized in Appendix 1.3.
7.2
Results
and Observations
7.2.1 To monitor and audit the implementation
of landscape and visual mitigation measures, 13 weekly landscape and visual
site audits were carried out in the reporting period.
7.2.2 No
deficiency in the mitigation measures on landscape and visual was observed
during the reporting period.
8
Cultural
Heritage
8.1
Archaeology
8.1.1 According to the assessment
included in the approved EIA report (Register No.: AEIAR-229/2021) the proposed
drainage works in the Lin Fa Tei area are located immediately adjacent to
existing river course on mainly Pleistocene terraced alluvium and the western
end of the alignment on Holocene alluvium between Lin Fa Tei Site of
Archaeological Interest (SAI) and Shui Lau Tin SAI. The proposed works are
partially located within Lin Fa Tei SAI. Previous investigations within
SAI have shown both in situ and secondary deposit and with potential for wooden
features near the stream bed. As per the recommendation from EIA report,
Archaeological Survey shall be conducted prior to the construction works, the
concerned area is marked in Figure 8.1.
8.1.2 A qualified archaeologist shall be
engaged and apply for a licence under the Antiquities and Monuments Ordinance
(Cap. 53) to conduct the Archaeological Survey prior to the construction phase.
The scope and methodology of the Archaeological Survey shall be agreed with
Antiquities and Monuments Office (AMO) prior to implementation. Tentatively and
subject to agreement with AMO, a fieldscan, where
possible, twenty auger tests and four 5 by 1m narrow trenches are proposed to
further assess the archaeological potential of the area. If significant remains
are uncovered, AMO should be notified and potential need for mitigation and/ or
an appropriate way forward should be agreed by AMO and relevant parties.
8.1.3 For remaining drainage work areas
(outside the area identified for Archaeological Survey) deemed to have limited
(near Kam Sheung Road) to minimal (remainder of Works Areas) archaeological
potential, AMO shall be informed immediately if antiquities or supposed
antiquities are discovered during construction works for the proposed drainage
improvement works for ascertaining required remedial works.
8.1.4 The
licence application for archaeological survey works at Lin Fa Tei, Yuen Long
was approved by the AMO on 28 June 2024. The Archaeological Survey at Lin Fa
Tei was carried out from 16 to 28 October 2024. During this period, the
qualified Archaeologist has excavated five test trenches (5m x 1.2m each in
size) coded TT1 to TT5 respectively and executed 20 auger tests coded AH1 to
AH20 respectively.
8.1.5 Generally,
the fill deposit at the top of the excavated area is modern and formed in
recent years; the sludge deposits underneath contain no archaeological remains
whatsoever.
8.1.6 Therefore,
it can be concluded that there is no archaeological potential in the Licence
Area, and the construction works of the Project will not cause any adverse
impact to archaeological heritage in this part of the Lin Fa Tei Site of
Archaeological Interest. The completion brief of archaeological survey was
submitted to AMO for review on 30 October 2024. Draft Report on
the Archaeological Survey at Lin Fa Tei were submitted to the AMO on 19
November 2024. Comments on the draft Report from the AMO were issued on
10 March 2025. The Report was revised and submitted to the AMO for
further review on 21 March 2025. No further comment
was received from the AMO up to the end of the reporting period.
8.2
Built
Heritage
8.2.1 According to the approved Updated
EM&A manual, mitigation measures that should be implemented during the
construction phase for graded historic buildings are presented in Table 8.1.
8.2.2 Condition surveys were carried out
by qualified structural engineer for Lee Tat Bridge, Lan Fong Study Hall and St
John’s Chapel prior to construction works. The
Pre-construction Condition Survey Report were submitted to the EPD on 22
December 2023 under Condition 2.10 of the EP.
8.2.3 Due
to the distance between the works area at Ha Che and the Lan Fong Study Hall
exceeded 30m radial distance during the reporting period, no vibration
monitoring was undertaken. Settlement and tilting monitoring at Lan Fong Study
Hall at Ha Che has been carried out during the reporting period (excluded
public holiday). The distance between the north works area at Ha Che and the
Lan Fong Study Hall is around 395.34m. While the distance between the south
works area at Ha Che and the Lan Fong Study Hall is around 63.76m. The layout
plan showing distance between the works area at Ha Che and the Lan Fong Study
Hall is presented in Figure 8.2. The monitoring locations of Lan
Fong Study Hall at Ha Che is presented are Figure 8.3. No exceedance
for relevant monitoring was recorded during the reporting period.
8.2.4 As
no construction work was carried out at Tai Wo during the reporting period, no
structural monitoring was conducted at St. John’s Chapel during the reporting
period.
8.2.5 No
monitoring has been carried out at Lee Tat Bridge at Lin Fa Tei as the works
areas are more than 500 m away.
8.2.6 Monitoring
data are submitted to the AMO on quarterly basis.
8.2.7 No
monitoring exceedance was recorded in the reporting period.
Table 8.1 Mitigation Measures for Impacted Graded Historic Buildings
|
Graded Historic Buildings |
Mitigation Measures |
|
Lee Tat Bridge, Shui Tsan Tin (Grade 3) |
§ A condition survey should be carried out in advance of works and after completion of works by qualified building surveyor or structural engineer. The Condition Survey Report should contain descriptions of the structure, identification of fragile elements, an appraisal of the condition and working methods for any proposed monitoring and precautionary measures that are or were recommended with aid of photo records. The condition survey report must be submitted to the AMO for comment before construction activities commence and after the works have been completed. The contractor should implement the approved monitoring and precautionary measures. § Vibration, settlement and tilting monitoring should be undertaken during the construction works to ensure that safe levels of vibration are not exceeded. An Alert, Alarm and Action (AAA) vibration limit set at 5 / 6 / 7.5 mm/s for Grade 3 historic buildings, settlement limit set at 6/ 8/ 10mm, and tilting limit set at 1/2000; 1/1500; 1/1000 should be adopted. Monitoring proposal, including checkpoint locations, installation details, response actions for each of the AAA levels and frequency of monitoring should be submitted for AMO's consideration. Installation of monitoring checkpoints shall be carried out in great care and adequate protection shall be provided so as to avoid unnecessary disturbance/ damage to the historic fabrics. Photo records of monitoring checkpoints shall be submitted upon installation for AMO's records. Monitoring records should be submitted to AMO on regular basis and alert AMO should the monitoring reach AAA levels. |
|
Lan Fong Study Hall, Chuk Hang (Grade 3) |
|
|
St John’s Chapel, Cheung Po (Grade 2) |
9
Environmental
Site Inspection and Audit
9.1
Implementation
Status of Environmental Mitigation Measures
9.1.1 Site audits were carried out by ET
on weekly basis at least once per week to monitor the implementation of proper
environmental management practices and mitigation measures in the Project site.
9.1.2
Total 13 site
inspections were carried out during the reporting period. No outstanding issues
were reported during the reporting period. Details of observations recorded
during the site inspections are presented in Table 9.1.
Table 9.1 Site Observations
|
Date |
Environmental Observations |
Follow-up Status |
|
7 May 2025 |
Observation(s) and Recommendation(s) Lin Fa Tei: 1. The Contractor was reminded to cover stockpiles with tarpaulin when they are not in used. |
Lin Fa Tei: 1. Stockpiles has been covered with tarpaulin. |
|
12 May 2025 |
Observation(s) and Recommendation(s) Sung Shan New Village: 1. Water spray regularly to maintain dust control. |
Sung Shan New Village: 1. Water spraying has been regularly applied to maintain dust control. |
|
21 May 2025 |
Observation(s) and Recommendation(s) Ha Che: 1. The contractor was reminded to adopt regular water spraying at exposed area for dust suppression. 2. Impervious sheeting should be provided for breaker to prevent land contamination on site. |
Ha Che: 1. Water spraying has been regularly applied to maintain dust control. 2. Impervious sheeting has been provided for placing the breaker to prevent land contamination on site. |
|
28 May 2025 |
Observation(s) and Recommendation(s) Lin Fa Tei: 1. Stockpiles should be covered with tarpaulin when they are not in use. 2. The contractor was reminded to adopt water spraying on Main Haul Road for dust suppression. |
Lin Fa Tei: 1. Stockpiles have been covered with tarpaulin. 2. The contractor has been adopted water spraying on Main Haul Road for dust suppression. |
|
4 June 2025 |
Observation(s) and Recommendation(s) Nil |
Nil |
|
11 June 2025 |
Observation(s) and Recommendation(s) Nil |
Nil |
|
18 June 2025 |
Observation(s) and Recommendation(s) Ha Che: 1. Stockpiles should be covered with tarpaulin when they are not in use especially during rainy season to prevent overflowing of silt materials on site. |
Ha Che: 1. Stockpiles has been covered with tarpaulin. |
|
25 June 2025 |
Observation(s) and Recommendation(s) Nil |
Nil |
|
2 July 2025 |
Observation(s) and Recommendation(s) Sung Shan New Village: 1. The empty chemical container should be removed. 2. The contractor was reminded to adopt water spraying on all exposed area and main haul road on site as dust control. (Reminder) |
Sung Shan New Village 1. The empty chemical container has been removed. |
|
9 July 2025 |
Observation(s) and Recommendation(s) Lin Fa Tei: 1. Oil pump should put in the drip tray to prevent land contamination on site. 2. Generator should display a NRMM label. |
Lin Fa Tei: 1. Oil pump has been removed to prevent land contamination on site. 2. The NRMM label has been displayed. |
|
16 July 2025 |
Observation(s) and Recommendation(s) Nil |
Nil |
|
23 July 2025 |
Observation(s) and Recommendation(s) Ha Che: 1. NRMM label should be displayed on construction equipment. 2. Impervious sheeting should be provided for breaker to prevent land contamination on site. |
Ha Che: 1. NRMM label has been displayed on construction equipment. 2. Impervious sheeting has been provided for breaker to prevent land contamination on site. |
|
30 July 2025 |
Observation(s) and Recommendation(s) Nil |
Nil |
9.1.3 According to the EIA Study Report, Environmental
Permit, contract documents and approved Updated EM&A Manual, the mitigation
measures detailed in the documents should be implemented as much as practical
during the reporting period. An updated Implementation Status of Environmental
Mitigation Measures (EMIS) is provided in Appendix 1.3.
10
Summary
of Monitoring Exceedance, Complaints, Notification of Summons and Prosecutions
10.1
Summary
of Exceedance
Water Quality Monitoring
10.1.1
No Action Level or
Limit Level exceedance was recorded during the
reporting period.
Noise
Monitoring
10.1.2 No Action Level or
Limit Level exceedance was recorded during the reporting period.
Built
Heritage
10.1.3 No monitoring exceedance
was recorded in the reporting period.
10.2
Summary
of Environmental Non-Compliance
10.2.1 No environmental
non-compliance was recorded in the reporting period.
10.3
Summary
of Environmental Complaint
10.3.1
No environmental
complaint was recorded during the reporting period. The Cumulative Complaint
Log is presented in Appendix 10.1.
10.4
Summary
of Environmental Summon and Successful Prosecution
10.4.1 There was no
successful environmental prosecution or notification of summons received since
the Project commencement. The Cumulative Log for environmental summon and
successful prosecution is presented in Appendix 10.1.
11
Conclusions and Recommendations
11.1 Conclusion
11.1.1 This 6th Quarterly
EM&A Report presents the EM&A works during the reporting period from 1
May 2025 to 31 July 2025 in accordance with the approved Updated EM&A
Manual.
11.1.2
Water Quality
Monitoring was conducted during the reporting period.
No Action Level or Limit Level exceedance was recorded for water quality
monitoring in the reporting period.
11.1.3
Construction noise
monitoring was carried out during the reporting period. No Action Level or
Limit Level exceedance was recorded for construction noise monitoring in the
reporting period.
11.1.4
Post-translocation
monitoring was conducted during the reporting period. None
of the translocated freshwater crabs from the pre-construction survey was found
in the upper and lower receptor sites of Ha Che during the reporting period.
11.1.5
Total 13
environmental site inspections and 13 landscape and visual site audits were
carried out in the reporting period. Recommendations on mitigation measures
were given to the Contractor for remediating the deficiencies identified during
the site inspections.
11.1.6 No environmental
complaints was received during the reporting period.
11.1.7 No notification of
summons and successful prosecutions were recorded in the reporting period.
11.1.8
The EM&A
methodology has been effective in monitoring the environmental impacts of the
Project and the effectiveness of the mitigation measures. The data collected
were useful in determining whether the Project had caused unacceptable impacts
on the sensitive receivers. Analysis of all EM&A data collected throughout
the baseline and the impact monitoring periods demonstrated the environmental
acceptability of the Project.
11.2
Comments/
Recommendations
11.2.1 The key environmental mitigation
measures for the Project in the coming reporting period expected to be
associated with the construction activities include:
Noise
§ Only well-maintained plant should be operated on-site, and plant should be maintained regularly during the construction programme; and
§ Quality Powered Mechanical Equipment (QPME) should be adopted as far as possible.
Water Quality
§ No effluent discharge would be allowed before acquired the effluent discharge license;
§ Surface run-off from construction sites should be discharged into dedicated discharge point via adequately designed sand/ silt removal facilities;
§ Channels/ earth bunds/ sandbags barriers should be provided on site to properly direct stormwater to silt removal facilities;
§ Silt removal facilities, channels and manholes should be maintained, and the deposited silt and grit should be removed regularly;
§ Open stockpiles of construction materials on sites should be covered with tarpaulin or similar fabric during rainstorms; and
§ Perimeter channels should be provided on site boundaries where necessary to intercept stormwater run-off from outside the site so that it will not wash across the site.
Waste Management
§ Provision of sufficient waste disposal points and regular collection of waste;
§ Regular cleaning and maintenance programme for drainage system; and
§ Chemical containers shall be stored with drip tray underneath.
Ecology
§ Minimize loss of habitats and associated wildlife; and
§ Using directional lighting to prevent excessive light spill into adjacent natural habitat and disturbance to nocturnal fauna.
Landscape and Visual
§ Construction activities shall be carefully designed to minimize impact on existing retained trees; and
§ Adequate tree protection measures shall be provided for the trees to be retained on site.
11.2.2
The proposed mitigation
measures were properly implemented and were considered effective and efficient
in pollution control.