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 28^th Monthly EM&A Report for the construction phase which summaries findings of the EM&A programme during the reporting period from 1 July 2023 to 31 July 2023. As informed by the Contractor, major activities in the reporting month were:

· Ground investigation at SDB & TTS

· Laying cable ducts and construction of cable draw pits near entrance of YLSTW

· ABWF and E&M works at CLP substation

· ELS works and RC structure works at IW & PST

· Installation of 813mm pipe pile at North of AGS

· Installation of King Post at AGS

· Breaking and removal of RAS (below ground)

· Installation of observation wells and dewatering well at AGS

· Demolition of Mixed Liquor Distribution & sludge Draw-off Chamber at FST no. 5-8

· Installation of sheet pile at TTS

· Installation of King post at TTS

· Installation of observation wells and dewatering well at TTS

· Installation of sheet pile at STB

· Demolition of underground structure at pump room of AFT

· Installation of sheet pile at UC5

· ELS works at UC5

· Sheet piling installation around Sludge digester no. 1 – 3

· Installation of sheet pile at Biogas Holder no. 1

· Construction of temporary 200m³ sludge holding tanks, and

· 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” and “SAS Thickener House-2” were submitted to EPD respectively on 1st November 2021, 23rd November 2021, 29th April 2022, 6th July 2022 and 19th June 2023. No contaminated soil and ground water was found within the Main Storeroom & Workshop, Mechanical Workshop, Waste Storage Area, SAS Thickener House-1 and SAS Thickener House-2, 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:

· Ground investigation at SDB, AGS & TTS.

· Ground investigation and footing construction works at Walkway (Portion 5)

· ABWF work and fixing GRC panel at CLP Substation

· ELS work and RC structure at IW & PST

· Installation of King Post at AGS

· Installation of 813mm pipe pile at North near West of AGS

· Installation of observation wells and dewatering well at AGS

· Erection temp. loading platform at AGS

· ELS work at AGS

· Demolition of underground structure at A. tank no. 5-8

· Installation of Sheet pile at TTS

· Installation of King post at TTS

· Installation of observation wells and dewatering well at TTS

· Erection temp. loading platform at TTS

· ELS work at TTS

· Demolition of Mixed Liquor Distribution & sludge Draw-off Chamber at FST no. 5-8

· Demolition of underground structure at pump room of AFT

· Driven pile works at STB (17nos.)

· Installation of sheet pile at STB

· ELS work at STB

· Installation of observation wells and dewatering well at STB

· ELS and construction of UC no.5

· Sheet piling work around Sludge digester no. 1-3

· ELS work at Sludge Digester no. 1-3

· Installation of observation wells and dewatering well at Sludge Digester no. 1-3

· Installation of sheet pile at Biogas Holder no. 1

· ELS work at Biogas Holder no. 1

· Driven pile works at UC (24nos.) near SDB

· Construction of temp. haul road in front of central Control Room