EXECUTIVE SUMMARY

i. This Monthly Environmental Monitoring and Audit (EM&A) Report is prepared for Contract No. SPW 07/2020 “Environmental Team for Construction of Yuen Long Effluent Polishing Plant Stage 1”. Drainage Services Department (DSD) has appointed Fugro Technical Services Limited (FTS) to undertake the Environmental Team services for the project and implement the EM&A works.

ii. This is the 25th Monthly EM&A Report for the Contract which summaries findings of the EM&A programme during the reporting period from 1 April 2023 to 30 April 2023. As informed by the Contractor, major activities in the reporting month were:

• ELS works and RC structure works at IW & PST;
• Installation of 813mm pipe pile at North & West of AGS;
• ABWF and E&M works at CLP substation;
• Ground investigation at SDB;
• Sheet piling installation around Sludge digester no. 1 – 3;
• Installation of sheet pile at TTS:
• Installation of sheet pile at STB;
• Excavation of trench for laying power cables and construction of cable draw pits near entrance of YLSTP;
• Demolition of Admin. Building;
• Installation of King Post at AGS;
• Laying 1200mm outfall pipe for temp. diversion;
• Installation of sheet pile at UC5; and
• Disposal of construction waste as indicated in Appendix I.

Breaches of Environmental Quality Performance Limits (AL levels)

iii. No Action and Limit Level exceedance was recorded for air quality monitoring and construction noise monitoring in the reporting month.

iv. No Action and Limit Level exceedance was recorded for water quality monitoring in the reporting month.

v. No Action / Limit exceedance was recorded for noise levels at stations (NMS1 and NMS2) in close proximity to the two active ardeid night roosts (ANR1 and ANR2) observed within the Survey Area during the reporting month.

vi. No Action / Limit exceedance for the ecological monitoring of birds in the reporting month.

vii. No corrective actions were required according to the Event and Action Plans for the Monitoring Parameters.

Land Contamination

viii. Regular site inspection was carried out to ensure the recommended mitigation measures are properly implemented. The signed final Contamination Assessment Report (CAR) for “Main Storeroom & Workshops”, “Mechanical Workshop”, “Waste Storage Area” and “SAS Thickener House-1” were submitted to EPD respectively on 1^st November 2021, 23^rd November 2021, 29^th April 2022 and 6^th July 2022. No contaminated soil and ground water was found within the Main Storeroom & Workshop, Mechanical Workshop, Waste Storage Area and SAS Thickener House-1, and no remedial action is required for both locations. Part of the Site investigation (SI) work within the SAS Thickener House-2 (i.e. ENV-BH18, ENV-BH19, ENV-BH20 and ENV-BH21) was completed by 23^rd February 2023. While the laboratory results of sampling works show that there is no contaminated soil or groundwater within the SAS Thickener House-2, the findings are summarized in the CAR for the area which was certified by ET Leader and verified by IEC on 30^th March 2023 and submitted to EPD on 1^st April 2023.

Complaint Log

ix. No complaints were received in the reporting period.

Notifications of Summons and Successful Prosecutions

x. No notifications of summons and successful prosecutions were received in the reporting period.

Reporting Change

xi. There were no reporting changes during the reporting month.

Future Key Issues

xii. The main works will be anticipated in the next three months are as follow:

• Ground investigation at SDB;
• Excavation of trench for laying power cables and cable draw pits near entrance of YLSTP;
• ABWF work and fixing GRC panel at CLP Substation;
• ELS work and RC structure at IW & PST;
• Laying 1200mm outfall pipe for temp. diversion;
• Installation of 813mm pipe pile at North and West of AGS;
• Installation of King Post at AGS;
• Erection temp. loading platform at AGS;
• Breaking and removal of RAS (below ground);
• ELS work at AGS;
• Installation of Sheet pile at TTS;
• Installation of King post at TTS;
• Erection temp. loading platform at TTS;
• ELS work at TTS;
• Installation of sheet pile at STB;
• ELS work at STB;
• Sheet piling work around Sludge digester no. 1 – 3;
• ELS work at Sludge Digester no. 1-3;
• Removal of surcharge including concrete blocks and filled soil at Biogas Holder no. 1;

• Installation of sheet pile at Biogas Holder no. 1;
• ELS work at Biogas Holder no. 1; and
• Installation of sheet pile, ELS and construction of UC no.5.

Contents

1. INTRODUCTION

2. AIR QUALITY

3. NOISE

4. WATER QUALITY

5. ECOLOGY MONITORING

6. LANDSCAPE AND VISUAL

7. LAND CONTAMINATION

8. SITE INSPECTION AND AUDIT

9. NON-COMPLIANCE, COMPLAINTS, NOTIFICATIONS OF SUMMONS AND SUCCESSFUL PROSECUTIONS

10. IMPLEMENTATION STATUS OF ENVIRONMENTAL MITIGATION MEASURE

11. FUTURE KEY ISSUES

12. CONCLUSION AND RECOMMENDATION

Tables

Table 1.1 Contact Information of Key Personnel

Table 1.2 Environmental Licenses, Notification and Permits Summary

Table 2.1 Air Quality Monitoring Equipment

Table 2.2 Air Quality Monitoring Location

Table 2.3 Summary of Air Quality Monitoring Results

Table 2.4 Comparison of 1-hr TSP data with EIA predictions

Table 3.1 Construction Noise Monitoring Equipment

Table 3.2 Monitoring Parameters and Frequencies of Noise Monitoring

Table 3.3 Construction Noise Monitoring Location

Table 3.4 Summary of Construction Noise Monitoring Results

Table 3.5 Comparison of Noise monitoring data with EIA predictions

Table 4.1 Water Quality Monitoring and Sampling Equipment

Table 4.2 Monitoring Parameters and Frequency

Table 4.3 Coordinates of Water Quality Monitoring Locations

Table 4.4 Summary of Water Quality Exceedance

Table 5.1 Noise Monitoring Parameters (For Active Ardeid Night Roost Survey)

Table 5.2 Active Ardeid Night Roost Survey Findings

Table 5.3 Noise Monitoring Results (For Active Ardeid Night Roost Survey)

Table 5.4 Noise Monitoring Parameters

Table 5.5 Abundance of all Avifauna Species

Table 5.6 Abundance of Species of Conservation Importance

Table 5.7 Shannon Diversity Index Value of all Avifauna Species

Table 5.8 Shannon Diversity Index Value of Species with Conservation Importance

Table 5.9 Wetland habitat utilization of all avifauna species

Table 5.10 Wetland habitat utilization of avifauna species of conservation importance

Table 5.11 Noise Monitoring Results (For Ecological Monitoring of Birds)

Table 8.1 – Waste Generated by the Construction and Disposal Ground

Table 10.1 – Status of submissions required under the EP

Figures

Figure 1 Location of Proposed Yuen Long Effluent Polishing Plant

Figure 2 Location of Construction Dust Monitoring Stations

Figure 3 Noise Monitoring Locations

Figure 4 Water Quality Monitoring Locations

Figure 5 Ecology Monitoring Locations

Appendices

Appendix A Construction Programme

Appendix B Project Organization Chart

Appendix C Action and Limit Levels

Appendix D Calibration Certificates/ Reports of Monitoring Equipments

Appendix E Environmental Monitoring Schedule

Appendix F Environmental Monitoring Results

Appendix G Wind Data

Appendix H Event and Action Plan

Appendix I Waste Flow Table

Appendix J Implementation Status of Environmental Mitigation Measures

Appendix K Weather and Meteorological Conditions

Appendix L Cumulative statistics on Environmental Complaints, Notifications of Summons and Successful Prosecutions

Appendix M Summary of the ET Leader’s Site Environmental Audit in the Reporting Month

Appendix N Outstanding Issues and Deficiencies

Appendix O Active Night Roost Monitoring Area and Vantage Points; and Noise Monitoring Stations

Appendix P Ecological Bird Monitoring Area with Locations of Point Count Sites and Transect Route