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 15th Monthly EM&A Report for the Contract which summaries findings of the EM&A programme during the reporting period from 1 June 2022 to 30 June 2022. As informed by the Contractor, major activities in the reporting month were:

• Sludge Digestion Tank by 1 rigs;
• Installation of sheet pile at IW & PST;
• Piling work at PST;
• Piling work at Transformer House;
• Drilling and installation of dewatering well and observation well at IW & PST;
• ELS works at IW & PST;
• Pipe laying for Zone 3 diversion;
• Zone 3 Diversion works:

1. Temp. Gravity thickening tank – Pipe laying and E&M installation work;
2. Temp. Sludge Holding Tank – Pipe laying and E&M installation work;
3. Temp. Water heater house – Pipe laying and E&M installation work;
4. Temp. Primary Sludge Pumping Station – ELS work;
5. Temp. Digested sludge pump / Supernatant Pumping – ELS Work;
6. Ferrie Chloride and Chemical Dosing System – R.C. works;
7. Digested Sludge Pumping Station house – Pipe laying and E&M installation work;

• Demolition of Sludge Holding Tank no. 1, 3 & 4;
• Foundation works at CLP substation;
• Installation of MIC unit at MIC office;
• Backfill work at FST no. 5-8;
• Backfill work at A. Tank 6-8;
• Construction of RC chamber at Zone 2B;
• Disposal of Pond Sediment excavated from PST; 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. Two exceedances in Action Level were recorded for the ecological monitoring of birds on 13 & 17 June 2022. These include significant declines in point count method results for the species diversity of all avifauna species in the community; and species diversity of species of conservation importance only. However, the exceedances were not project-related.

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” and “Waste Storage Area” were submitted to EPD respectively on 1^st November 2021, 23^rd November 2021 and 29^th April 2022. No contaminated soil and ground water was found within the Main Storeroom & Workshop, Mechanical Workshop and the Waste Storage Area, and no remedial action is required for both locations. Part of the Site investigation (SI) work within the SAS Thickener House-1 (i.e. ENV-BH16, ENV-BH17, ENV-BH22 and ENV-BH23) was completed by 16^th May 2022. While the laboratory results of sampling works show that there is no contaminated soil or groundwater within the SAS Thickener House-1, the findings are summarized in the draft CAR for the area which is under review and will be submitted to EPD.

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:

• Demolition of Admin. Building, Settled Sewage Overflow Chamber, Sludge Holding Tanks no. 1, 3 & 4 (below ground), Water Heater House, Return Activated Sludge Screw Pump Pumping station, Air Floatation Thickener and Auxiliary Pumping Station (below ground);
• Pipe Laying and construction of RC chamber at Zone 2B and subsequence diversion work;
• ELS work and RC structure at IW & PST;
• Installation of Sheet pile at TTB;
• Piling work at PST;
• Piling work at Sludge Thickening Building;
• ELS works at IW & PST;
• Construction of RC structure at 3 zone (Location D -Temp. Primary Sludge Pumping Station);
• Pipe laying for Zone 3 diversion;
• Backfilling work and installation of pipe pile wall for demolition of Aeration Tank no. 5-8 at AGS;
• Construction of CLP Substation;
• Construction of MiC office;
• Demolition of PST no. 1 & 4;
• Ground investigation at AGS, SDB, SDT & STB;
• Sheet piling work around Sludge digester no. 1 – 3;
• Installation of brand drain at Biogas Holder no. 1;
• Installation of concrete blocks and soil Surcharge at Biogas Holder no. 1;
• Construction of temp. traffic road at north of SHT no. 3 & 4;
• Construction of PST structure;
• 3 zone diversion works:

1. E&M work at temp. Gravity thickening tank (Atal);
2. E&M work at temp. Sludge Holding Tank (Atal);
3. E&M work at temp. water heater house (Atal);
4. RC work at temp. Primary sludge pumping station;
5. ELS, RC construction and E&M work at Temp. digested sludge pump, Ferrie Chloride and Chemical Dosing System;
6. E&M work at Digested Sludge Pumping Station.
• Construction of RC chamber at Zone 2B.

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

Appendix Q Notification of Exceedance