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|
Author signature |
|
Certified by |
|
|
Name |
Jason Man |
Name |
F. C. Tsang |
|
Title |
Environmental Team Consultant |
Title |
Environmental Team Leader |
1.2 Construction Works Programme
1.4 Construction Works Programme and Construction Works Area
1.5 Summary of Environmental Status
2.3 Monitoring Parameter and Frequency
2.4 Sampling Depths & Replication
2.8 Action and Limit Level for Water Quality Monitoring
3.2 Noise Monitoring Parameter, Frequency and Duration
3.3 Monitoring Equipment, Methodology and QA / QC Procedure
3.4 Maintenance and Calibration
4.2 Habitat Compensation for the Affected Riverine Habitat
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. 31
10.3 Summary of Environmental Complaint
10.4 Summary of Environmental Summon and Successful Prosecution
11.1 Works and Potential Environmental Issues in the next Reporting Period
12.2 Comments/ Recommendations
Appendices
Appendix 1.1 Construction Programme
Appendix 1.2 Project Organization Chart
Appendix 1.3 Implementation Status of Environmental Mitigation Measure
Appendix 2.1 Calibration Certificates of Impact Water Quality Monitoring Equipment
Appendix 2.2 Event and Action Plan for Water Quality Exceedance
Appendix 2.3 Impact Monitoring Schedule of the Reporting Month
Appendix 2.4 Impact Water Quality Monitoring Data
Appendix 3.1 Calibration Certificates of Impact Noise Monitoring Equipment
Appendix 3.2 Event and Action Plan for Noise Exceedance
Appendix 3.3 Impact Noise Monitoring Data
Appendix 11.1 Impact Monitoring Schedule of Next Reporting Month
Figures
Figure 1.1 General Site Location Plan
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 8.2 Layout plan showing distance between the works area at Ha Che and the Lan Fong Study Hall
Figure 8.3 Monitoring Locations of Lan Fong Study Hall at Ha Che
Figure 8.4 Monitoring Locations of St. John’s Chapel near Tai Wo
Tables
Table A1 Summary of EM&A activities in the Reporting Period
Table A2 Summary of Exceedances in the Reporting Period
Table A3 Summary of Exceedances of the Last Reporting Period
Table 1.1 Parties Involved in Project Organisation
Table 1.2 Status of Environmental License, Notifications and Permits
Table 1.3 Summary of Status for Key Environmental Aspects under the Approved Updated EM&A Manual
Table 2.1 Summary of Impact Water Quality Monitoring Stations
Table 2.2 Parameters measured in the Impact Water Quality Monitoring
Table 2.3 Water Quality Monitoring Equipment
Table 2.4 Method for Laboratory Analysis for Water Samples
Table 2.5 Action and Limit Levels for Water Quality
Table 2.6 Action and Limit Levels of Water Quality
Table 2.7 Summary of Exceedance Records of Water Quality Monitoring in the Reporting Period
Table 2.8 Summary of Exceedance Records of Water Quality Monitoring in the Last Reporting Period
Table 3.1 Noise Monitoring Stations during Construction Phase
Table 3.2 Construction Noise Monitoring Parameter, Frequency and Duration
Table 3.3 Construction Noise Monitoring Equipment
Table 3.4 Action and Limit Levels for Construction Noise Monitoring
Table 3.5 Summary of Construction Noise Monitoring Results
Table 3.6 Influencing Factors at Noise Monitoring Stations
Table 8.1 Mitigation Measures for Impacted Graded Historic Buildings
Table 9.1 Site Inspection Record
Executive Summary
A1. This is the 13th Monthly Environmental Monitoring and Audit (EM&A) Report for Drainage Improvement Works Near Four Villages in Yuen Long (the Project). This report was prepared by Aurecon Hong Kong Limited under Contract No. DC/2022/02 Drainage Improvement Works at Yuen Long – Stage 2 (hereinafter called the “Contract”). This report documents the findings of EM&A works during the reporting period from 1 to 28 February 2025.
Key Construction Works in the Reporting Period
A2. A summary of construction activities undertaken during the reporting period is presented below:
§ 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
§ Temporary Drainage Diversion
§ Excavation and Lateral Support, Relocate/ Divert Utilities, Rebar Fixing, Formwork Erection and Cast-in, Concreting; and
§ Sheet pilling & Backfilling and Compaction
Sung Shan New Village
§ Site Clearance
§ Temporary Drainage Diversion
§ Excavation and Lateral Support, Relocate/ Divert Utilities, Rebar Fixing, Formwork Erection and Cast-in, Concreting; and
§ Sheet pilling & Backfilling and Compaction
Tai Wo
§ Site Clearance
§ Excavation and Lateral Support, Relocate/ Divert Utilities, Rebar Fixing, Formwork Erection and Cast-in, Concreting; and
§ Sheet pilling & Backfilling and Compaction
Monitoring and Audit Programme
A3. The monthly EM&A programme was undertaken by the ET in accordance with the approved Updated EM&A Manual. A summary of the monitoring and audit activities during the reporting period is presented in Table A1.
Table A1 Summary of EM&A activities in the Reporting Period
|
EM&A Activities |
Date |
|
Water Quality Monitoring |
Ha Che, Lin Fa Tei and Sung Shan New Village: 3, 10, 17 and 24 February 2025
Tai Wo 1, 3, 5, 7, 10, 12, 14, 17, 19, 21, 24, 26 and 28 February 2025 |
|
Noise Monitoring |
Ha Che, Lin Fa Tei, Sung Shan New Village and Tai Wo 1, 4, 10, 21 and 27 February 2025 |
|
Weekly Environmental Site Inspection |
Breaches of Action and Limit Levels
A4. No exceedance was recorded in the reporting month. Summary of the environmental exceedance for the reporting month is tabulated in Table A2 & A3.
Table A2 Summary of Exceedances for Water Quality and Noise in the Reporting Period
|
Environmental Monitoring |
Parameter |
No. of non-project related exceedances |
Total No. of non-project related exceedances |
No. of exceedances related to the the project |
Total No. of exceedance related to the project |
||
|
AL |
LL |
AL |
LL |
||||
|
Water Quality |
DO |
0 |
0 |
0 |
0 |
0 |
0 |
|
Turbidity |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
SS |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
Noise |
Leq(30mins) |
0 |
0 |
0 |
0 |
0 |
0 |
Table A3 Summary of Exceedances for Cultural Heritage in the Reporting Period
|
Environmental Monitoring |
Parameter |
No. of non-project related exceedances |
Total No. of non-project related exceedances |
No. of exceedances related to the the project |
Total No. of exceedance related to the project |
||||
|
Alert Level |
Alarm Level |
Action Level |
Alert Level |
Alarm Level |
Action Level |
||||
|
Cultural Heritage |
Settlement |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Tilting |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
Vibration |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Water Quality
A5. No exceedance during impact water quality monitoring was recorded during reporting period.
Noise
A6. No Action Level or Limit Level exceedance was recorded for construction noise monitoring in the reporting period.
Cultural Heritage
A7. No exceedance was recorded for settlement, tilting and vibration monitoring during the reporting period.
Complaint Log
A8. The investigation results for the environmental complaint regarding air quality and environmental complaint regarding water quality on 22 January 2025 had been investigated during the reporting period. The summary of the investigation results was presented below:
Environmental Complaint regarding air quality on 22 January 2025
A9. It was recorded that a complaint regarding air quality was received by the EPD on 22 January 2025 and referred to DSD, ET and IEC on 24 January 2025. The complaint was related to the lack of dust suppression measures from the construction site at Lin Fa Tei.
A10. Under the investigation, the precautionary dust suppression measures were implemented on site before and on 22 January 2025 by the contractor. The following measures included:
· Regular watering had been provided for excavated works sites and main haul road;
· Water spraying for vehicle wheeling washing and dust suppression at the exit of the construction sites;
· Paving haul road with concrete to reduce generation of fugitive dust during vehicle travelling; and
· Covering open stockpiles.
A11. To enhance the dust suppression on site, the Contractor had implemented the following measures after 22 January 2025:
· Increasing watering frequency on excavated work sites and main haul roads;
· Ensuring all excavated work sites and main haul roads had adopted proper and regular watering;
· Ensuring water spraying for vehicle wheel washing and dust suppression has been adopted at the exit of the construction sites; and
· Avoiding open stockpiles placing near air sensitive receivers and ensuring that the stockpiles are covered with tarpaulin when they are not in use.
A12. During the site investigation conducted by the ET at Lin Fa Tei on 22 January 2025 and 28 January 2025, the ET observed that:
· Stockpiles are covered with tarpaulin;
· Water spraying has been adopted on main haul road and exposed area;
· Water spraying for vehicle wheel washing and dust suppression has been adopted at the exit of the construction sites; and
· No observation of fugitive dust.
A13. Based on the information provided by the Contractor and information collected from the site inspection, it concluded that dust suppression measures have been properly implemented on site to mitigate fugitive dust impact on the nearby residents. No deficiency observation in relation to fugitive dust impact were recorded during the site inspections on 22 and 28 January 2025. After the complaint, the Contractor has enhanced and properly implemented the precautionary and mitigation measures to suppress dust from the work area and within the site boundary. As no further complaint of lacking dust suppression measures was received, the case is considered closed.
Environmental Complaint regarding water quality on 22 January 2025
A14. It was recorded that a complaint regarding water quality was received from 1823 on 22 January 2025 and referred to RE, ET on same day. The complaint was related to the discharge of effluent from the construction site at Lin Fa Tei. Based on the information provided by the Contractor and the information collected from the site inspection, no effluent was discharged at the concerned area (the dewatering pit) and freshwater in the dewatering pit was properly direct to the downstream by water bypass. Therefore, it is concluded that the complaint is invalid.
A15. One environmental complaint regarding air quality and one environmental complaint about waste management were recorded during the reporting period. The relevant investigations are conducting by the related parties. The investigation results will be presented when the investigation has been completed.
Notification of Summons and Successful Prosecutions
A16. No notification of summons or successful prosecutions was received in the reporting period.
Reporting Changes
A17. No reporting changes in the reporting period.
Future Key Issues
A18. The major site activities for the next reporting period are summarized below:
§ 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
Sung Shan New Village
§ Site Clearance
§ Temporary Drainage Diversion
§ Excavation and Lateral Support, Relocate/ Divert Utilities, Rebar Fixing, Formwork Erection and Cast-in, Concreting; and
§ Sheet pilling & Backfilling and Compaction
Tai Wo
§ Site Clearance
§ Temporary Drainage Diversion
§ Excavation and Lateral Support, Relocate/ Divert Utilities, Rebar Fixing, Formwork Erection and Cast-in, Concreting; and
§ Sheet pilling & Backfilling and Compaction
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 13th
Monthly EM&A Report summarizing the key findings of the construction phase
EM&A programme from 1 to 28 February 2025 (the reporting period) and is
submitted to fulfil the requirements in Condition 4.4 of EP-596/2021 and
Section 12.2 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 works 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.
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. A summary of
construction activities undertaken during this reporting period is presented
below:
§ 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
§ Temporary Drainage Diversion
§ Excavation and Lateral Support, Relocate/ Divert Utilities, Rebar Fixing, Formwork Erection and Cast-in, Concreting; and
§ Sheet pilling & Backfilling and Compaction
Sung Shan New Village
§ Site Clearance
§ Temporary Drainage Diversion
§ Excavation and Lateral Support, Relocate/ Divert Utilities, Rebar Fixing, Formwork Erection and Cast-in, Concreting; and
§ Sheet pilling & Backfilling and Compaction
Tai Wo
§ Site Clearance
§ Excavation and Lateral Support, Relocate/ Divert Utilities, Rebar Fixing, Formwork Erection and Cast-in, Concreting; and
§ Sheet pilling & Backfilling and Compaction
1.5
Summary of Environmental Status
1.5.1 A summary of the relevant permits,
licences, and/or notifications on environmental protection for this Project is
presented in Table 1.2.
Table 1.2 Status of Environmental License, Notifications and Permits
|
Permit / License No. |
Valid Period |
Status |
|
|
From |
To |
||
|
Environmental Permit |
|||
|
EP-596/2021 |
28/09/2021 |
N/A |
Valid |
|
Notification pursuant to Air Pollution Control (Construction Dust) Regulation |
|||
|
Ref. Number: 497623 |
29/09/2023 |
N/A |
Valid |
|
Billing Account for Disposal of Construction Waste |
|||
|
7048880 |
18/10/2023 |
N/A |
Valid |
|
Registration of Chemical Waste Producer |
|||
|
5213-526-W3771-01 |
02/11/2023 |
N/A |
Valid |
|
Effluent Discharge License under Water Pollution Control Ordinance |
|||
|
Lin Fa Tei WT10002494-2023 |
24/05/2024 |
31/05/2029 |
Valid |
|
Tai Wo WT10002495-2023 |
29/07/2024 |
31/07/2029 |
Valid |
|
Ha Che WT10002496-2023 |
26/04/2024 |
30/04/2029 |
Valid |
|
Sung Shan New Village WT10002497-2023 |
10/07/2024 |
31/07/2029 |
Valid |
|
Construction Noise Permit (CNP) |
|||
|
Lin Fa Tei GW-RN0091-25 |
29/01/2025 |
28/07/2025 |
Valid |
|
Ha Che GW-RN0092-25 |
01/02/2025 |
31/07/2025 |
Valid |
|
Sung Shan New Village GW-RN1184-24 |
11/10/2024 |
01/04/2025 |
Valid |
1.5.2
The status for all
environmental aspects is presented in Table 1.3.
1.5.3 The EM&A programme has been
implemented in accordance with the recommendations presented in the approved
EIA Report and the approved Updated EM&A Manual. A summary of
implementation status of the environmental mitigation measures for the construction
phase of the Project during the reporting period is provided in Appendix 1.3.
Table 1.3 Summary of Status for Key Environmental Aspects under the Approved Updated EM&A Manual
|
The baseline water quality monitoring results have been reported in Baseline Monitoring Report and submitted to EPD under EP Condition 4.3. |
|
|
The regular impact water quality monitoring was commenced at Ha Che on 21 February 2024. Since construction works were commenced at Lin Fa Tei and Tai Wo on 20 March 2024, impact water quality monitoring at Lin Fa Tei (i.e. C6, C7A and C8) and Tai Wo (i.e. C4 and C5) were started 20 March 2024. Impact water quality monitoring at Sung Shan New Village (i.e. C1A, C2 and C3A) was commenced on 17 April 2024 since the construction work at Sung Shan New Village was begun on 16 April 2024. |
|
|
Up to the end of the reporting period, the baseline noise monitoring results for Ha Che have been reported in the Baseline Monitoring Report and submitted to the EPD under EP Condition 4.3. Baseline noise monitoring results for Tai Wo, Lin Fa Tei, and Sung Shan New Village will be further updated in the Baseline Monitoring Report and submitted to the EPD. The revised Baseline Monitoring Report was submitted to EPD for acceptance on 4 July 2024. |
|
|
The weekly impact noise monitoring was commenced at Ha Che on 23 February 2024. Since construction works were commenced at Lin Fa Tei and Tai Wo on 20 March 2024, impact noise monitoring at Lin Fa Tei (i.e. LFT_M1, LFT_M3A, LFT_M7 and LFT_M11) and Tai Wo (i.e. TW_M2 and TW_M3) were started 20 March 2024. Impact noise monitoring at Sung Shan New Village (i.e. SSNV_M2, SSNV_M3 and SSNV_M6) was commenced on 19 April 2024 since the construction work at Sung Shan New Village was begun on 16 April 2024. The noise monitoring at LFT_M7 have been suspended since 27 March 2024 due to the objection from property management office for providing access to designated monitoring location. The property management office formally refused our application of access right LFT_M7 on 29 May 2024. An alternative monitoring location LFT_M6 was proposed to replace LFT_M7 and agreed with the ER and the IEC on 29 May 2024 and 4 June 2024 respectively, impact noise monitoring was thus carried out at LFT_M6 from 4 June 2024 onward. |
|
|
The first draft of HCMP was submitted to the EPD and the Agriculture, Fisheries and Conservation Department (AFCD) on 22 December 2023. Following comments from the EPD and AFCD dated 17 January 2024, the revised HCMP was submitted to EPD and AFCD for further review. Further comment was received from EPD on 27 May 2024, the revised HCMP was submitted to EPD for approval on 13 June 2024. It was accepted by EPD on 9 July 2024. |
|
|
No suspected contamination was observed or reported by the Contractor in the reporting period. |
|
|
|
|
|
The first draft of LVMP was submitted to the EPD, the AFCD and the Planning Department (PlanD) on 22 December 2023. Following comments from the EPD, AFCD and PlanD on 7 February 2024, the LVMP is pending for further revision. The updated LVMP was submitted to EPD for review on 24 July 2024. Comment for LVMP (Rev. 6) was received from EPD on 16 August 2024, the revision of LVMP (Rev. 7) had been submitted to EPD on 21 January 2025. |
|
|
Weekly Site Audit |
|
|
The Archaeological Survey at Lin Fa Tei was carried out from 16 to 28 October 2024. The completion brief of archaeological survey was submitted to AMO for review on 30 October 2024. No comment was received from the AMO up to the end of the reporting period. |
|
|
Site Inspection covering Measures of Air Quality, Noise, Water Quality, Waste, Land Contamination, Ecological Quality, Landscape and Visual Impacts and Cultural Heritage |
|
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 10 monitoring stations 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 (3) |
825497 |
830664 |
Control Monitoring Point |
|
C5 (3) |
825486 |
830716 |
Impact Monitoring Point |
|
|
LFT |
C6 |
827232 |
831713 |
Control Monitoring Point |
|
C7A (4) |
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) 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.
(4) 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.
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 |
C4 |
||
|
C5 |
(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.
2.3.2 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
Sampling
Depths & Replication
2.4.1
During impact
water quality monitoring, each station was sampled. Due to a shallow water
depth (less than 3 m) with low flow rates in rivers, all the monitoring would
be located at mid-depth level.
2.4.2
Duplicate water
samples were collected at each sampling depth for laboratory measurement of SS.
Samples were stored in high density polythene bottles, packed in ice
(cooled to 4 °C without being frozen), and delivered to the laboratory on the
same day of collection for analysis.
2.5
Monitoring
Equipment
2.5.1
The measurement of
DO, temperature, turbidity, salinity, pH and stream water depth were undertaken
in-situ. In-situ monitoring instruments in compliance with the
specifications listed under Section 2.3 of Appendix 4 of the approved Updated
EM&A Manual were adopted to undertake the water quality monitoring for the
Project. Water quality monitoring equipment with the following
specifications shall be supplied and maintained by the ET.
Dissolved Oxygen and Temperature Measuring Equipment
2.5.2
The instrument for
measuring dissolved oxygen and temperature should be portable and weatherproof
complete with cable, sensor, and use DC power source. The equipment was capable
of measuring:
§ A dissolved oxygen level in the range of 0 – 20 mg/L and 0 – 200% saturation; and
§ The temperature within 0 – 45 °C.
2.5.3
It should have a
membrane electrode with automatic temperature compensation connected with a
cable. Sufficient stocks of spare electrodes and cables should be available for
replacement where necessary (e.g. YSI model 59 meter, YSI 5739 probe, YSI 5795A
submersible stirrer with reel and cable or an approved similar instrument).
pH
2.5.4
pH meter (e.g. Hanna
– HI 9024 or equivalent) should be used to measure pH value of water samples
in-situ. It should be readable to 0.1 pH in a range of 0 to 14.
Standard buffer solutions of at least pH 7 to pH 10 shall be used for
calibration of the instrument before and after use.
Turbidity Measurement Equipment
2.5.5
The instrument
should be a portable, weatherproof turbidity-measuring instrument with a
comprehensive operation manual. The equipment should use a DC power
source. It should have a photoelectric sensor capable of measuring
turbidity between 0 – 1000 NTU and be equipped with a cable (e.g. Hach model
2100P or an approved similar instrument).
Suspended Solids
2.5.6
A water sampler
should comprise a transparent PVC cylinder, with a capacity of not less than 2
litres, and should be effectively sealed with latex cups at both ends. The
sampler should have a positive latching system to keep it open and prevent
premature closure until released by a messenger when the sampler is at the
selected water depth (e.g. Kahlsico Water Sampler or an approved similar
instrument).
2.5.7
Water samples for
suspended solids measurement shall be collected in high density polythene
bottles, packed in ice (chilled to 4 °C without being frozen), and delivered to
the laboratory as soon as possible after collection.
Water Depth Detector
2.5.8
A portable,
battery-operated echo sounder should be used for determining water depth at
each designated monitoring station.
2.5.9
For shallow water
(less than 1 m deep), a portable water depth ruler will be used to measure
water depth.
Monitoring Position Equipment
2.5.10
A hand-held or
boat-fixed digital Global Positioning System (GPS) or other equivalent
instrument of similar accuracy shall be provided and used during water quality
monitoring to ensure the water sampling locations are correct during water
quality monitoring work.
Water Sampling Equipment
2.5.11
A transparent PVC or
glass cylinder, which has a volume of not less than 2 litres and can be sealed
at both ends with cups, should be equipped with a positive latching system.
During the water sampling, a messenger is released to trigger the closure of
the water sampler at suitable water depth.
2.5.12
For sampling
location with shallow water depth, plastic bucket would be used instead.
Calibration of In-situ Instruments
2.5.13
All in-situ
monitoring instruments should be checked, calibrated and certified by a
laboratory accredited under HOKLAS or another international accreditation
scheme before use, and subsequently re-calibrated at 3-monthly intervals
throughout all stages of the water quality monitoring. Responses of sensors and
electrodes should be checked with certified standard solutions before each use.
Wet bulb calibration for a DO meter should be carried out before measurement at
each monitoring location.
2.5.14
For the on-site
calibration of field equipment, the BS 127:1993, Guide to Field and On-Site
Test Methods for the Analysis of Water should be observed.
Back-up Equipment
2.5.15 Sufficient stocks
of spare parts should be maintained for replacements when necessary. Backup
monitoring equipment shall also be made available so that monitoring can
proceed uninterruptedly even when some equipment is under maintenance,
calibration, etc.
2.5.16
Table 2.3 summarizes the equipment used in
the water quality monitoring programme. Copies of the calibration certificates
of multi-parameter water quality monitoring system are shown in Appendix 2.1.
Table 2.3 Water Quality Monitoring Equipment
|
Equipment |
Model |
Quantity |
Serial No. |
Parameter |
Range |
Accuracy |
|
Water Sampler |
Wildco 2.2L Water Sampler with messenger or plastic bucket (used in shallow water depth) |
1 |
N/A |
N/A |
N/A |
N/A |
|
Multi-functional Water Quality Meter |
YSI ProDSS (multi-parameters) |
2 |
22D100436, and 22C106561 |
Dissolved Oxygen (DO) |
0 to 500% |
· 0 to 200%: ±1% of reading · 200 to 500%: ±8% of reading |
|
0 to 50 mg/L |
· 0 to 20 mg/L: ±0.1 mg/L or 1% of reading, whichever is greater · 20 to 50 mg/L: ±8% of reading |
|||||
|
Temperature |
-5 to 50 °C |
±0.2 °C |
||||
|
pH |
0 to 14 pH units |
±0.2 pH units |
||||
|
Turbidity |
0 to 4000 NTU |
· 0 to 999 NTU: 0.3 NTU or ±2% of reading, whichever is greater · 1000 to 4000 NTU: ±5% of reading |
||||
|
Salinity |
0 to 70 ppt |
· ±1.0% of reading or ±0.1 ppt, whichever is greater |
||||
|
Water Depth Ruler |
鼎峯0708 |
1 |
N/A |
Water depth |
0 – 7 m (Used for water depth less than 1 m) |
±0.01 m |
|
Positioning Equipment |
Garmin (GPSmap 78s) |
1 |
1WL223754 |
Positioning |
N/A |
GPS: ±1m |
2.6
Monitoring
Methodology
2.6.1
Water samples were
collected at an appropriate water depth using a sealable transparent PVC or
glass cylinder. For locations with shallow water depth, a plastic bucket
was used as an alternative. Usually, water was then transferred to the sample
bottles until they were filled to the top with no remaining air space before
the lid was securely screwed on. For samples that were preserved with
acid or alkalis prior to transport to the laboratory, the samples bottles were
filled to the level specified by the analytical laboratory.
2.6.2 Multi-functional water quality
meters were checked, calibrated and certified by Quality Pro Test-Consult
Limited (HOKLAS reg no. 259) before use, and would be subsequently
re-calibrated at 3-monthly intervals throughout all stages of the water quality
monitoring. Responses of sensors and electrodes should be checked with
certified standard solutions before each use. Wet bulb calibration for a DO
meter should be carried out before measurement at each monitoring
location. For the on-site calibration of field equipment, the BS
127:1993, Guide to Field and On-Site Test Methods for the Analysis of Water
should be observed.
2.6.3 Water samples for suspended solids
measurement were collected in high density polythene bottles, packed in ice
(chilled to 4 °C being frozen), and delivered to the laboratory as soon as
possible after collection.
2.6.4 Water sampling equipment deployed during
the monitoring programme was decontaminated by manual washing and rinsed with
clean distilled water after each sampling location.
2.6.5
All sampling
bottles were labelled with the sample ID (including the indication of sampling
station), laboratory number and sampling date. Water samples were dispatched to
the testing laboratory for analysis as soon as possible after the sampling.
All samples were stored in a cool box and kept at less than 4 °C but
without frozen. All water samples were handled under chain of custody protocols
and relinquished to the laboratory representatives at locations specified by
the laboratory. The laboratory determination works started within 24 hours
after collection of water samples.
Laboratory Analytical Methods
2.6.6
Analysis of SS was
carried out by a HOKLAS accredited laboratory (Acumen Laboratory and Testing
Limited). At least two replicate samples from each independent sampling
event were collected for the SS measurement. Sufficient water samples
(about 3,000 mL) were collected at the monitoring stations for carrying out the
laboratory SS determination. The analytical method for suspended solids
is presented in Table 2.4.
Table 2.4 Method for Laboratory Analysis for Water Samples
|
Parameters |
Analytical Method |
Detection Limit |
|
Suspended Solid (SS) |
APHA 17ed 2540-D (1) |
1 mg/L or better |
Note:
(1) APHA American Public Health Association Standard Methods for the Examination of Water and Wastewater.
2.7
QA/QC
Requirements
Decontamination Procedures
2.7.1
Water sampling
equipment used during the course of the monitoring process was decontaminated
by manual washing and rinsed with distilled water after each sampling event.
All of the disposable components/ accessories were discarded after sampling.
Sampling Management and Supervision
2.7.2
All sampling
bottles were labelled with the sample ID numbers (including the sampling
station), and sampling date. Water samples were dispatched to the testing
laboratory for analysis as soon as possible. All the collected samples were
stored in a cool box to keep the temperature less than 4 as possible after the
sampling. All samples were stored in a cool box and kept at less than 4
°C but without frozen. All water samples were handled under chain of
custody protocols and relinquished to the laboratory representatives at
locations specified by the laboratory.
Quality Control Measures for Sample Testing
2.7.3
Quality control of
laboratory analysis of water samples was performed by Acumen Laboratory and
Testing Limited for every batch of 20 samples:
§ One method blank; and
§ One set of QC sample
2.8
Action
and Limit Level for Water Quality Monitoring
2.8.1
The criteria of
action and limit levels for water quality monitoring are defined in Table 2.5.
Table 2.5 Action and Limit Levels for Water Quality
|
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 |
(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 limits
(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.
2.8.2
Based on the
criteria listed in Table 2.5,
the action and limit levels for water quality are determined in Table 2.6.
Table 2.6 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.
2.9 Event and Action Plan
2.9.1 Should any non-compliance of the criteria
occur, action in accordance with the Event and Action Plan in Appendix 2.2 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.
2.10
Results
and Observations
2.10.1
The water quality
monitoring schedule for this reporting month is shown in Appendix 2.3. The monitoring results
and graphical presentation of water quality monitoring at the monitoring
stations are shown in Appendix 2.4.
2.10.2 After confirmation
of exceedance of the water quality monitoring results, ET has issued
Notification of Exceedance (NOE) to inform relevant parties (i.e., EPD, ER, IEC
and Contractor) about the exceedances. No exceedance during impact water
quality monitoring was recorded during reporting period. The exceedance of
impact water quality monitoring in the reporting Period is summarised in Table 2.7.
Table 2.7 Summary of Exceedance Records of Water Quality Monitoring in the Reporting Period
|
Parameter |
No. of non-project related exceedances(1) |
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 |
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) |
#47, Shui Tsan Ti |
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.
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.
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 |
3.3
Monitoring
Equipment, Methodology and QA / QC Procedure
3.3.1
As referred to the
technical memorandum issued under the Noise Control Ordinance (NCO), sound level
meters in compliance with the International Electrotechnical Commission
Publications 651: 1979 (Type 1) and 804: 1985 (Type 1) specifications were used
for carrying out the construction noise monitoring.
3.3.2
Noise measurements
were not made in fog, rain, wind with a steady speed exceeding 5 m/s or wind
with gusts exceeding 10 m/s. The wind speed was checked with a portable
wind speed meter capable of measuring the wind speed in m/s.
3.3.3
Sufficient numbers
of noise measuring equipment and associated instrumentation were prepared by
the ET. All the equipment and associated instrumentation were clearly
labelled.
3.3.4
Wind data were
collected from the records of Hong Kong Observatory Shek Kong Weather Station,
which is about 2 km south-west of Ha Che and about 900 m north of Lin Fa Tei.
3.3.5
The monitoring
procedures are as follows:
§ For façade measurement, the monitoring station was set at a point 1 m from the exterior of the sensitive receivers building façade and set at a position 1.2 m above the ground. For free-field measurement, the monitoring station was set at a position 1.2 m above the ground.
§ The battery condition was checked to ensure good functioning of the meter.
§ Parameters such as frequency weighting, the time weighting and the interval were set as follows:
- Frequency weighting: A
- Time weighting: Fast
- Interval: 30 minutes (Leq(30mins)) would be determined for daytime noise by calculating the logarithmic average of six Leq(5mins) data
§ Prior to and after each noise measurement, the meter was calibrated using an acoustic calibrator for 94.0 dB at 1000 Hz. If the difference in the calibration level before and after measurement is more than 1.0 dB, the measurement was considered invalid and repeat of noise measurement will be required after re-calibration or repair of the equipment.
§ At the end of the monitoring period, the values of Leq, L90 and L10 were recorded. In addition, noise sources were recorded on a standard record sheet.
3.3.6
Table 3.3 summarizes the noise monitoring
equipment used during the construction noise monitoring. Calibration certificates
for the impact noise monitoring equipment are attached in Appendix 3.1.
Table 3.3 Construction Noise Monitoring Equipment
|
Equipment |
Model |
No. of Equipment |
Serial No. |
|
Sound Level Meter |
NTi Audio XL2 |
1 |
A2A-09696-E0 |
|
Acoustic Calibrator |
Rion NC-75 |
1 |
34724244 |
3.4
Maintenance
and Calibration
3.4.1
Maintenance and
calibration procedures are as follows:
§ The microphone head of the sound level meter and calibrator were regularly cleaned with a soft cloth; and
§ The sound level meter and acoustic calibrator were calibrated annually by a HOKLAS accredited laboratory or the manufacturer.
3.5
Action
and Limit Levels
3.5.1
The Action and
Limit levels were established in accordance with the approved Updated EM&A
Manual. Table 3.4
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 3.2 shall be carried out.
Table 3.4 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) |
(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.
3.6
Results
and Observations
3.6.1 The construction noise monitoring
was conducted on 1, 4, 10, 21 and 27 February 2025. The monitoring schedule is
presented in Appendix 2.3.
3.6.2 The construction noise monitoring
results are summarized in Table 3.5.
No Action or Limit levels exceedance was recorded in the reporting
period. Details of the results and graphical presentation are shown in Appendix 3.3.
Table 3.5 Summary of Construction Noise Monitoring Results
|
Monitoring Station |
Noise Level, dB(A) |
Limit Level |
|
|
Leq(30mins) |
|||
|
Minimum |
Maximum |
||
|
SSNV_M2 |
50.1 |
53.0 |
75 dB(A) |
|
SSNV_M3 |
59.7 |
62.3 |
75 dB(A) |
|
SSNV_M6(1) |
63.8 |
65.3 |
75 dB(A) |
|
TW_M2(1) |
54.3 |
55.2 |
75 dB(A) |
|
TW_M3(1) |
55.0 |
55.3 |
75 dB(A) |
|
HC_M3A(1) |
66.8 |
70.3 |
75 dB(A) |
|
HC_M4 |
62.3 |
64.0 |
75 dB(A) |
|
HC_M6 |
61.6 |
65.1 |
75 dB(A) |
|
LFT_M1 |
61.6 |
62.6 |
75 dB(A) |
|
LFT_M3A(1) |
60.6 |
61.7 |
75 dB(A) |
|
LFT_M5 |
58.3 |
61.1 |
75 dB(A) |
|
LFT_M6 |
59.6 |
62.9 |
75 dB(A) |
|
LFT_M11 |
56.4 |
58.3 |
75 dB(A) |
Note:
(1) For Free Field measurement, +3 dB(A) was added to the measured results.
3.6.3
During the
construction noise monitoring period, the influencing factors which may affect
the results are summarized in Table 3.6.
Table 3.6 Influencing Factors at Noise Monitoring Stations
|
Monitoring Stations |
Influencing Factors |
|
SSNV_M2 |
Nil |
|
SSNV_M3 |
Nil |
|
SSNV_M6 |
Nil |
|
TW_M2 |
Nil |
|
TW_M3 |
Nil |
|
HC_M3A |
Road Traffic Noise |
|
HC_M4 |
Road Traffic Noise |
|
HC_M6 |
Road Traffic Noise |
|
LFT_M1 |
Nil |
|
LFT_M3A |
Nil |
|
LFT_M5 |
Road Traffic Noise |
|
LFT_M6 |
Nil |
|
LFT_M11 |
Road Traffic Noise |
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.
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.
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 The
upper and lower receptor sites of Ha Che and receptor site of Lin Fa Tei were
visited on 17 February 2025 to monitor the population of freshwater crabs
translocated from Ha Che CH.A11.13~CH.A300.00, Lin Fa Tei CH.A0.00~CH.A200.00,
and Ha Che CH.A300.00~CH.A653.949.
4.1.7 Site
conditions of both receptor sites at Ha Che and Lin Fa Tei receptor site in the
reporting month were similar to previous months, i.e. no pollution or
anthropogenic disturbance was observed. However, vegetation at Lin Fa Tei
receptor site has been cleared. Representative photos of the site conditions
are presented in Plate 4.1.
Plate 4.1 Site condition of receptor sites at Ha Che and Lin Fa Tei during the reporting month
|
Upper receptor site for Cryptopotamon anacoluthon at Ha Che
|
Lower receptor site for Somanniathelphusa zanklon at Ha Che
|
Receptor site for Cryptopotamon anacoluthon and Somanniathelphusa zanklon at Lin Fa Tei
4.1.8 None
of the translocated individuals from the pre-construction surveys was found in
the upper and lower receptor sites of Ha Che or the receptor site of Lin Fa Tei
in the reporting month. The inability to recapture the translocated individuals
could be due to the structural complexity of the habitats of both sites. The
presence of many rocks and riffles at the upper Ha Che receptor site and large
and deep pools in the lower Ha Che and Lin Fa Tei receptor sites provides
excellent refuge and protection for the crabs.
4.1.9 However,
one new individual of C. anacoluthon without markings was captured at
the Ha Che Upper receptor site. This individual, however, was not a
translocated individual as their details (i.e., carapace, sex and species) did
not match with any of the translocated individuals in the record. These individuals
were released immediately after record. Its details are summarized in Table 4.1.
Table 4.1 Summary of Freshwater Crab Species Captured during the Post-Translocation Monitoring
|
Species |
ID No./Code |
Sex |
Carapace Size (mm) |
Receptor Site |
Time of Capture |
Remarks |
|
C. anacoluthon |
New Individual |
M |
13.3 |
Ha Che Upper |
19:19 |
/ |
4.2
Habitat Compensation for the Affected Riverine Habitat
4.2.1 In order to ensure the reinstated
habitat could compensate the loss of the important riverine habitat, Habitat Creation
and Management Plan (HCMP) was approved by EPD under Condition 2.9 of the EP.
The relevant drainage improvement works has been conducted continuously during
the reporting period in accordance with the HCMP.
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 have been 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, four weekly
landscape and visual site audits were carried out on 5, 12, 19 and 26 February
2025.
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. No 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. The Antiquities and Monuments
Office (AMO) had no adverse comment on the report on 3 January 2024. A formal
reply letter was issued by the EPD on 21 June 2024 for their acceptance on the
report.
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 Settlement,
tilting and vibration monitoring at St. John’s Chapel near Tai Wo were carried
out during the reporting period. The monitoring locations of St. John’s Chapel
near Tai Wo are presented in Figure 8.4. No exceedance for relevant
monitoring was recorded 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 is submitted to the AMO on
quarterly basis.
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 inspections
were carried out on a weekly basis to monitor the implementation of proper
environmental pollution control and mitigation measures under the Contract.
In the reporting period, site inspections were carried out on 5,
12, 19 and 26 February 2025 at the site portions listed in Table 9.1
below.
Table 9.1 Site Inspection Record
|
Date |
Inspected Site Portion |
Time |
|
5 February 2025 |
Ha Che |
14:30 – 15:00 |
|
12 February 2025 |
Lin Fa Tei |
14:30 – 15:00 |
|
19 February 2025 |
Sung Shan New Village |
14:00 – 15:00 |
|
26 February 2025 |
Tai Wo |
11:00 – 11:30 |
9.1.2
Environmental
deficiencies were observed during weekly site inspection. Key observations
during the site inspections and during the reporting period are summarized in Table 9.2.
|
Date |
Environmental Observations |
Follow-up Status |
|
5 Feb 2025 |
Observation(s) and Recommendation(s)
Ha Che: 1. The Contractor was reminded to place the updated CNP on site. |
Ha Che: 1. The updated CNP has been displayed on site by the contractor. |
|
12 Feb 2025 |
Observation(s) and Recommendation(s)
Lin Fa Tei: 1. The Contractor was reminded to direct waterflow to the wastewater treatment system before discharge especially during rainy day. |
Lin Fa Tei: 1. The water flow was redirected to the wastewater treatment system before discharge by the contractor. |
|
19 Feb 2025 |
Observation(s) and Recommendation(s)
Nil |
Nil |
|
26 Feb 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
10.1.1
During the
reporting month, no exceedances for impact water
quality monitoring was recorded.
10.1.2 No Action Level or
Limit Level exceedance was recorded for construction noise monitoring in the
reporting period.
10.1.3 No exceedance for
settlement and tilting monitoring was recorded during 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
The investigation
results for the environmental complaint regarding air quality and environmental
complaint regarding water quality on 22 January 2025 had been investigated
during the reporting period. The summary of the investigation results was
presented below:
Environmental Complaint regarding air quality on 22 January 2025
10.3.2 It was recorded
that a complaint regarding air quality was received by the EPD on 22 January 2025
and referred to DSD, ET and IEC on 24 January 2025. The complaint was related
to the lack of dust suppression measures from the construction site at Lin Fa
Tei.
10.3.3 Under the
investigation, the precautionary dust suppression measures were implemented on
site before and on 22 January 2025 by the contractor. The following measures
included:
· Regular watering had been provided for excavated works sites and main haul road;
· Water spraying for vehicle wheeling washing and dust suppression at the exit of the construction sites;
· Paving haul road with concrete to reduce generation of fugitive dust during vehicle travelling; and
· Covering open stockpiles.
10.3.4 To enhance the
dust suppression on site, the Contractor had implemented the following measures
after 22 January 2025:
· Increasing watering frequency on excavated work sites and main haul roads;
· Ensuring all excavated work sites and main haul roads had adopted proper and regular watering;
· Ensuring water spraying for vehicle wheel washing and dust suppression has been adopted at the exit of the construction sites; and
· Avoiding open stockpiles placing near air sensitive receivers and ensuring that the stockpiles are covered with tarpaulin when they are not in use.
10.3.5 During the site
investigation conducted by the ET at Lin Fa Tei on 22 January 2025 and 28
January 2025, the ET observed that:
· Stockpiles are covered with tarpaulin;
· Water spraying has been adopted on main haul road and exposed area;
· Water spraying for vehicle wheel washing and dust suppression has been adopted at the exit of the construction sites; and
· No observation of fugitive dust.
10.3.6 Based on the
information provided by the Contractor and information collected from the site inspection,
it concluded that dust suppression measures have been properly implemented on
site to mitigate fugitive dust impact on the nearby residents. No deficiency
observation in relation to fugitive dust impact were recorded during the site
inspections on 22 and 28 January 2025. After the complaint, the Contractor has
enhanced and properly implemented the precautionary and mitigation measures to
suppress dust from the work area and within the site boundary. As no further
complaint of lacking dust suppression measures was received, the case is
considered closed.
Environmental Complaint regarding water quality on 22 January 2025
10.3.7 It was recorded that
a complaint regarding water quality was received from 1823 on 22 January 2025
and referred to RE, ET on same day. The complaint was related to the discharge
of effluent from the construction site at Lin Fa Tei. Based on the information
provided by the Contractor and the information collected from the site
inspection, no effluent was discharged at the concerned area (the dewatering
pit) and freshwater in the dewatering pit was properly direct to the downstream
by water bypass. Therefore, it is concluded that the complaint is invalid.
10.3.8 One environmental
complaint regarding air quality and one environmental complaint about waste
management were recorded during the reporting period. The relevant
investigations are conducting by the related parties. The investigation results
will be presented when the investigation has been completed.
10.3.9 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
Future
Key Issues
11.1
Works
and Potential Environmental Issues in the next Reporting Period
11.1.1
The construction
programme for the Project for the next reporting period is presented in Appendix 1.1.
11.1.2
Works to be
undertaken in the next reporting period are summarized 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
§ Temporary Drainage Diversion
§ Excavation and Lateral Support, Relocate/ Divert Utilities, Rebar Fixing, Formwork Erection and Cast-in, Concreting; and
§ Sheet pilling & Backfilling and Compaction
Sung Shan New Village
§ Site Clearance
§ Temporary Drainage Diversion
§ Excavation and Lateral Support, Relocate/ Divert Utilities, Rebar Fixing, Formwork Erection and Cast-in, Concreting; and
§ Sheet pilling & Backfilling and Compaction
Tai Wo
§ Site Clearance
§ Excavation and Lateral Support, Relocate/ Divert Utilities, Rebar Fixing, Formwork Erection and Cast-in, Concreting; and
§ Sheet pilling & Backfilling and Compaction
11.1.3 Potential
environmental impacts arising from the above construction activities are mainly
associated with construction noise impact, water quality impact, ecological
impact, waste management, and landscape and visual.
11.2
Recommendation
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
§ 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 tentative
schedule of regular construction noise and water quality monitoring in the next
reporting period is presented in Appendix 11.1.
The regular impact noise and water quality monitoring will be conducted at the
same monitoring locations in the next reporting period.
12
Conclusions
12.1
Conclusion
12.1.1
This 13th
Monthly EM&A Report presents the EM&A works during the reporting period
from 1 to 28 February 2025 in accordance with the approved Updated EM&A
Manual.
12.1.2
No exceedance
during impact water quality monitoring was recorded during reporting period.
12.1.3 No Action Level or
Limit Level exceedance was recorded for construction noise monitoring in the
reporting period.
12.1.4 No exceedance was
recorded for settlement, tilting and vibration monitoring during the reporting
period.
12.1.5
Environmental site
inspections were conducted on 5, 12, 19 and 26 February 2025 by the ET in the
reporting period.
12.1.6
The investigation
results for the environmental complaint regarding air quality and environmental
complaint regarding water quality on 22 January 2025 had been investigated
during the reporting period. The summary of the investigation results was
presented below:
Environmental
Complaint regarding air quality on 22 January 2025
12.1.7 It was recorded
that a complaint regarding air quality was received by the EPD on 22 January
2025 and referred to DSD, ET and IEC on 24 January 2025. The complaint was
related to the lack of dust suppression measures from the construction site at
Lin Fa Tei.
12.1.8 Under the
investigation, the precautionary dust suppression measures were implemented on
site before and on 22 January 2025 by the contractor. The following measures
included:
· Regular watering had been provided for excavated works sites and main haul road;
· Water spraying for vehicle wheeling washing and dust suppression at the exit of the construction sites;
· Paving haul road with concrete to reduce generation of fugitive dust during vehicle travelling; and
· Covering open stockpiles.
12.1.9 To enhance the
dust suppression on site, the Contractor had implemented the following measures
after 22 January 2025:
· Increasing watering frequency on excavated work sites and main haul roads;
· Ensuring all excavated work sites and main haul roads had adopted proper and regular watering;
· Ensuring water spraying for vehicle wheel washing and dust suppression has been adopted at the exit of the construction sites; and
· Avoiding open stockpiles placing near air sensitive receivers and ensuring that the stockpiles are covered with tarpaulin when they are not in use.
12.1.10 During the site investigation
conducted by the ET at Lin Fa Tei on 22 January 2025 and 28 January 2025, the
ET observed that:
· Stockpiles are covered with tarpaulin;
· Water spraying has been adopted on main haul road and exposed area;
· Water spraying for vehicle wheel washing and dust suppression has been adopted at the exit of the construction sites; and
· No observation of fugitive dust.
12.1.11 Based on the information provided
by the Contractor and information collected from the site inspection, it
concluded that dust suppression measures have been properly implemented on site
to mitigate fugitive dust impact on the nearby residents. No deficiency
observation in relation to fugitive dust impact were recorded during the site
inspections on 22 and 28 January 2025. After the complaint, the Contractor has
enhanced and properly implemented the precautionary and mitigation measures to
suppress dust from the work area and within the site boundary. As no further
complaint of lacking dust suppression measures was received, the case is
considered closed.
Environmental
Complaint regarding water quality on 22 January 2025
12.1.12 It was recorded that a complaint
regarding water quality was received from 1823 on 22 January 2025 and referred
to RE, ET on same day. The complaint was related to the discharge of effluent
from the construction site at Lin Fa Tei. Based on the information provided by
the Contractor and the information collected from the site inspection, no
effluent was discharged at the concerned area (the dewatering pit) and
freshwater in the dewatering pit was properly direct to the downstream by water
bypass. Therefore, it is concluded that the complaint is invalid.
12.1.13 One environmental complaint
regarding air quality and one environmental complaint about waste management
were recorded during the reporting period. The relevant investigations are
conducting by the related parties. The investigation results will be presented
when the investigation has been completed.
12.1.14 The ET will keep track on the
construction works to confirm compliance of environmental requirements and the
proper implementation of all necessary mitigation measures.
12.2
Comments/
Recommendations
12.2.1
The proposed
mitigation measures were properly implemented and were considered effective and
efficient in pollution control.