i. This Quarterly Environmental Monitoring and Audit (EM&A) Summary 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 9th Quarterly EM&A Summary Report for the Contract which summaries findings of the EM&A programme during the reporting period from 1 April 2023 to 30 June 2023. As informed by the Contractor, major activities in the reporting period were shown in section 1.4.1.

iii. The EM&A methodology has been effective in monitoring the environmental impacts of the Project and the effectiveness of the mitigation measures. The data collected were useful in determining whether the Project had caused unacceptable impacts on the sensitive receivers. Analysis of all EM&A data collected throughout the baseline and the impact periods demonstrated the environmental acceptability of the Project.

Breaches of Environmental Quality Performance Limits (AL levels)

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

v. No Action and Limit Level exceedance was recorded for water quality in the reporting period.

vi. No Action / Limit Level exceedance was recorded for noise levels at stations (NMS1 and NMS2) in close proximity to the active ardeid night roosts during the reporting period.

vii. No Action / Limit Level exceedance was recorded for the ecological monitoring of birds during the reporting period.

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

Land Contamination

ix. 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 laboratory results are compared against the adopted RBRGs and soil saturation limit (Csat) for soil samples and the adopted RBRGs and the solubility limits for groundwater samples. No exceedance of RBRG are recorded for both soil samples and groundwater samples. Furthermore, no exceedance of the soil saturation limit are recorded for soil samples. However, the exceedances of solubility limits for PCRs (C9-C16) are recorded for groundwater samples collected at BH-18, BH-19, BH-20 and BH-21; and also PCRs (C17-C35) for BH-21. As no non-aqueous phase liquid (NAPL) was observed during sampling, no further sampling and remediation are required. As no contaminated soil and groundwater is found within the “SAS Thickener House-2”, no remediation actions are required for contaminated soil and groundwater for the scheduled land use of 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 31^st May 2023 and submitted to EPD on 19^th June 2023.