This Monthly Environmental Monitoring and Audit (EM&A) Report is prepared for Contract No. SPW 02/2023 “Environmental Team for Construction of Yuen Long Effluent Polishing Plant Stage 1”. Drainage Services Department (DSD) has appointed Aurecon Hong Kong Limited (Aurecon) to undertake the Environmental Team services for the project and implement the EM&A works.

This is the 52^nd Monthly EM&A Report for the construction phase which summaries findings of the EM&A programme during the reporting period from 1 July 2025 to 31 July 2025. As informed by the Contractor, major activities in the reporting month were:

· Fixing GRC panel at CLP Substation

· Pipe works and manhole installation at emergency bypass chamber

· ABWF, E&M and sheet pile works at IW

· ABWF, E&M and sheet pile works at PST

· ELS work at SDB

· External works at site-wide of predrilling at walkway and water meter cabinet

· ELS work at AGS

· RC structure at TTS

· ABWF and E&M works at STB

· Demolish Existing SDT 1-4

· RC work at Sludge Digester no. 1-3

· E&M work at Biogas Holder no. 1

· Disposal of construction waste as indicated in Appendix I.

Breaches of Environmental Quality Performance Limits (AL levels)

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

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

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.

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

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

Land Contamination

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”, “SAS Thickener House-1”, “SAS Thickener House-2”and “Screening Press House” were submitted to EPD respectively on 1^st November 2021, 23^rd November 2021, 29^th April 2022, 6^th July 2022, 19^th June 2023 and 29^th October 2024. No contaminated soil and ground water was found within the Main Storeroom & Workshop, Mechanical Workshop, Waste Storage Area, SAS Thickener House-1, SAS Thickener House-2 and Screening Press House, and no remedial action is required for these locations.

Complaint Log

No complaints were received in the reporting period.

Notifications of Summons and Successful Prosecutions

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

Reporting Change

There were no reporting changes during the reporting month.

Future Key Issues

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

· Fixing GRC panel at CLP Substation

· Pipe works and manhole installation at emergency bypass chamber

· ABWF, E&M and sheet pile works at IW

· ABWF, E&M and sheet pile works at PST

· ELS work and RC work at SDB

· Predrill works at ADB

· External works at site-wide include water meter cabinet

· ELS work and RC structure at AGS

· RC structure at TTS

· ABWF and E&M work at STB

· Demolish Gas Holder GH2

· ELS work at UC3

· RC structure at Sludge Digester no. 1-3 with PP1

· ELS work at Sludge Digester no. 4-6

· RC work at Biogas Holder no. 2-3 foundation