Monitoring Activities	Frequency
Daytime Noise monitoring	13 times
Landfill Gas Monitoring	1905 times
Environmental Site Inspection	13 times

1.1. Background

1.1.1. The proposed Desalination Plant at Tseung Kwan O (DPTKO) will produce potable water with an initial capacity of 135 million litres per day (MLD), expandable to an ultimate capacity of 270 MLD in the future to provide a secure and alternative fresh water resource complying with the World Health Organization (WHO) standards. The plant will adopt the Seawater Reverse Osmosis (SWRO) technology, which dominates the market due to its reliability and progressive reduction in cost as the technology advances.

1.1.2. Pursuant to the Environmental Impact Assessment Ordinance (EIAO), the Director of Environmental Protection granted the Variation of Environmental Permit (No. EP-503/2015/A) to Water Supplies Department (WSD) for the Project on 26 January 2018.

1.1.3. The scope of the Contract may be considered in brief, to consist of the laying of about 10km long 1200mm diameter freshwater mains and the associated works along the alignment of the Project as shown with the overall view in Appendix B.

1.2. The Reporting Scope

1.2.1. This is the 17^th Quarterly EM&A Report for the Project which summarizes the key findings of the EM&A programme during the reporting period from 1 August to 31 October 2022.

1.2.2. Contact details of the key personnel are presented in Table 1.1 below:

Table 1.1 Contract Details of Key Personnel

Party	Position	Name	Telephone no.
Penta-Ocean-Concentric Joint Venture	Environmental Officer	Calvin Chik	9863-5630
Acuity Sustainability Consulting Limited	Environmental Team Leader	Jacky Leung	2698-6833
ANewR Consulting Limited	Independent Environmental Checker	James Choi	2618-2831

1.3. Summary of Construction Works

1.3.1. Details of the major construction works undertaken in this reporting quarter are shown in Table 1.2. The construction programme is presented in Appendix A.

Table 1.2 Summary of Construction Works Undertaken in the Reporting Quarter

Location	Construction Works undertaken in the Reporting Quarter
TKO Area 137
Pit A	Pipe trench excavation and pipe laying
Pit B	Pipe laying
Pit C	Pipe trench excavation and pipe laying
Wan Po Road
Workfront 1	Pipe trench excavation and pipe laying
Workfront 2	Pipe trench excavation and pipe laying
Workfront 3	Carriageway reinstatement
Workfront 5	Pipe trench excavation and pipe laying
Workfront 6	Pipe trench excavation, pipe laying and construction of Pit A0
Pit A	Hand-shield excavation between Pit A to Pit A0
Junction of Wan O Road	Pipe trench excavation and pipe laying
Central divider near Lohas Park	Backfilling & reinstatement of central divider
Pit C1	Pipe trench excavation and pipe laying
Shek Kok Road
Pit D1	Pipe trench excavation and pipe laying
Roundabout	Trench backfilling and reinstatement
Pit D	Trench backfilling and reinstatement
Pit F	Pit construction
Creative School
--	Trench excavation and pipe laying
Pung Loi Road
Pit WPR1	TBM pipe jacking
Velodrome
Pit L – Pit M	Pipe cleaning and connection
Pit M – Pit N	Hydrostatic pressure testing for completed pipe
Po Lam Road
PLR South	Trench backfilling and reinstatement
Location A	Pipe cap construction and trench excavation and pipe laying
B3	Carriageway reinstatement
Tsui Lam Road
Location B	Construction of pile cap, ELS, and excavation for cap construction
TKO Primary Service Reservoir
--	Pipe cleaning and CCTV survey

1.4. Summary of Construction Works

1.4.1. A summary of the valid permits, licences, and /or notifications on environmental protection for this Project is presented in Table 1.3.

Table 1.3 Summary of the Status of Valid Environmental Licence, Notification, Permit and Documentations

Reference	Validity Period	Remark
Variation of Environmental Permit
EP no.: EP -503/2015/A	Throughout the Contract	-
Notification of Construction Works under the Air Pollution Control (Construction Dust) Regulation (Form NA)
Ref no.: 423775	Throughout the Contract	-
Chemical Waste Producer Registration
WPN: 5213-839-P3287-01	Throughout the Contract	-
Billing Account for Disposal of Construction Waste
A/C no.: 7029491	Throughout the Contract	-
Water Discharge License
WT00032336-2018	Until 31 Dec 2023	-
Construction Noise Permit
GW-RE0326-22	Until 1 Oct 2022	Expired in the reporting period
GW-RE0329-22	Until 1 Oct 2022
GW-RE0330-22	Until 1 Oct 2022
GW-RE0353-22	Until 1 Oct 2022
GW-RE0706-22	Until 20 Oct 2022

1.4.2. The status for all environmental aspects is presented Table 1.4.

Table 1.4 Summary of Status for Key Environmental Aspects under the EM&A Manual

Parameters	Status
Noise
Baseline Monitoring	The baseline noise monitoring result has been reported in Baseline Monitoring Report and submitted to EPD under VEP Condition 3.4
Impact Monitoring	On-going
Waste Management
Mitigation Measures in Waste Management Plan	On-going
Landfill Gas Monitoring
Monitoring	On-going
Environmental Audit
Site Inspection	On-going

1.4.3. Other than the EM&A works by ET, regular environmental management meetings were conducted in order to enhance environmental awareness and closely monitor the environmental performance of the contractors.

1.4.4. The EM&A programme has been implemented in accordance with the recommendations presented in the approved EIA Report and the EM&A Manual. A summary of implementation status of the environmental mitigation measures for the construction phase of the Project during the reporting period is provided in Appendix C.

2. Noise Monitoring

2.1. Monitoring Requirements

2.1.1. To ensure no adverse noise impact, noise monitoring is recommended to be carried out within 300m radius from the nearby sensitive receivers (NSRs) during construction phase. Referring to the EM&A Manual Section 4.1.2, the impact noise monitoring should be carried out at all designated monitoring stations when there are project-related construction activities undertaken within a radius of 300m from the monitoring stations.

2.2. Monitoring Parameter

2.2.1. Impact noise monitoring was conducted weekly in the reporting quarter between 0700-1900 on normal weekdays. Construction noise level was measured in terms of the A-weighted equivalent continuous sound pressure level (L_Aeq). L_{eq 30min} was used as the monitoring parameter for the time period between 0700 and 1900 on normal weekdays. Table 2.1 summarizes the monitoring parameters, frequency, and duration of the impact noise monitoring.

Table 2.1 Noise Monitoring Parameters, Time, Frequency and Duration

Time

Frequency

Duration

Parameters

Daytime

0700 – 1900

Once per week

Continuously in

Leq 5min/Leq 30min (average of 6 consecutive Leq 5min)

Leq, L10 & L90

2.2.2. The monitoring methodology and QA/QC procedure could be referring to Section 2.4 of the Monthly EM&A Report.

2.3. Monitoring Location

2.3.1. According to the environmental findings detailed in the EIA report and Baseline Monitoring Report, the designated locations for the construction noise monitoring are listed in Table 2.2 and shown in Figure 2.1 – 2.3.

Table 2.2 Designated Nosie Monitoring Station

NSR ID	Noise Sensitive Receivers	Monitoring Location	Position
NSR4	Creative Secondary School	Roof Floor	1m from Façade
NSR24	PLK Laws Foundation College	Pedestrian Road on Ground Floor	Free-Field
NSR31	School of Continuing and Professional Studies - CUHK	Roof Floor	1m from Façade

Diagram

Description automatically generated

Figure 2.1 NSR4 Creative Secondary School

Diagram

Description automatically generated

Figure 2.2 NSR24 PLK Laws Foundation College

Diagram

Description automatically generated

Figure 2.3 NSR31 School of Continuing and Professional Studies - CUHK

2.4. Action and Limit Level

2.4.1. The Action/Limit Levels are in line with the criteria of Practice Note for Professional Persons (ProPECC PN 2/93) “Noise from Construction Activities – Non-statutory Controls” and Technical Memorandum on Environmental Impact Assessment Process issued by HKSAR Environmental Protection Department [“EPD”] under the Environmental Impact Assessment Ordinance, Cap 499, S.16 are presented in Table 2.3.

Table 2.3 Action and Limit Level for Construction Noise Monitoring

Time Period

Action Level

Limit Level

0700 – 1900 on normal weekdays

When one documented complaint is received from any one of the noise sensitive receivers

· 70 dB(A) for school and

· 65 dB(A) during examination period

Notes:

(a) Limits specified in the GW-TM and IND-TM for construction and operation noise, respectively.

2.5. Monitoring Results and Observation

2.5.1. 13 times of noise impact monitoring were conducted as schedule in the reporting quarter at NSR4 Creative Secondary School since projected-related construction activities were undertaken within a radius of 300m from the monitoring location.

2.5.2. No construction works were conducted within 300m radius of NSR4 and NSR31. Thus, no construction noise monitoring was carried out at NSR4 and NSR31 in the reporting quarter.

2.5.3. The Graphical presentation of the construction noise monitoring results was shown in Figure 2.4.

Figure 2.4 Graphical presentation of the construction noise monitoring at NSR4

2.5.4. No Action or Limit level exceedance of construction noise monitoring was recorded in the reporting quarter. Summary of exceedance could be referring to Appendix D.

2.5.5. If non-compliance occurred, actions as stated in Appendix F will be undertaken.

2.5.6. The major noise sources identified at the designated noise monitoring station were vehicle movement near the Creative Secondary School.

3. Waste Management

3.1. Mitigation measure on waste management have been implemented in accordance with the requirements of the EM&A Manual. Suitable C&D materials were reused on-site, while the remaining C&D materials and non-inert wastes were disposed at the public filling reception facilities and the landfills respectively. The quantities disposed in the reporting quarter could be referring to Appendix G.

4. Summary of Exceedance, Complaints, Notification of Summons and Prosecutions

4.1. All construction noise monitoring was conducted as schedule in the reporting quarter. No Action or Limit Level exceedance was recorded in the reporting quarter.

4.2. Landfill gas monitoring was carried out by the Registered Safety Officer of the Contractor at the excavation locations and within the consultation zones. No Action or Limit Level exceedance was recorded in the reporting quarter. Summary of Exceedance could be referring to Appendix D.

4.3. No environmental complaint, notification of summons and prosecution was received in the reporting quarter.

5. EM&A Site Inspection

5.1. Site inspections were carried out on a weekly basis to monitor the implementation of proper environmental pollution control and mitigation measures under the Contract. Three joint site inspections with IEC were carried out on 26 August, 27 September, 26 October 2022.

5.2. Minor deficiencies were observed during weekly site inspection. Key observations during the site inspections are summarized in Table 5.1 – 5.3.

Table 5.1 Site Observations (August 2022)

Date	Environmental Observations	Follow-up Status
5 August 2022	No major observation was recorded on the respective day.	Nil
12 August 2022	No major observation was recorded on the respective day.	Nil
19 August 2022	1. Drip tray should be provided for chemical storage (Pit D) 2. Muddy surface runoff should be collected and treated properly to comply the discharge license standard. (Pit D) 3. Gully should be protected / covered to avoid untreated wastewater discharge to gully. (Pit D) 4. Oil leakage was observed at Wan Po Road Pit A. Contractor was reminded to clear the oil stain and avoid further oil leakage from the machine.	1. Chemical was removed. 2. Surface runoff was collected and treated properly before discharge. 3. Gully was covered. 4. Oil leakage was prevented
26 August 2022	No major observation was recorded on the respective day.

Table 5.2 Site Observations (September 2022)

Date	Environmental Observations	Follow-up Status
1 September 2022	1. Drip tray should be provided for chemical storage. (Pit D) 2. Muddy surface runoff should be collected and treated properly and avoid runoff to nearby gully. (Pit D) 3. Gully should be protected and covered properly to avoid muddy water discharge into gully. (Pit D)	1. Chemical was removed. 2. Surface runoff was collected and treated properly. 3. Gully was covered properly.
8 September 2022	1. Pit 2 and 6 the water drains along the construction site shall be blocked or cover with sandbags to avoid any polluted water into the storm drain. 2. There are no sedimentation tanks available on site, the contractors are required to modify as soon as possible, no discharge are allowed. 3. There are general refuses found along the site Pit 2 and 3, the contractor shall provide sufficient garbage containers and clean up / remove the refuses immediately. 4. There are chemicals found in Pit 2 placed on the ground, the chemicals shall be stored properly (i.e., drip tray)	1. Water drains along the construction site was surrounded by sandbags to avoid polluted water into the storm drain. 2. Sedimentation tank was deployed on site, all wastewater was treated before discharge. 3. General refuse was removed. 4. Chemical were removed.
16 September 2022	1. Drip tray shall be provided for chemical storage. (Pit D) 2. Wastewater should be treated with wastewater treatment facility before discharge. (TKO Area 137 Pit C) 3. Muddy surface runoff should be collected and treated properly and avoid runoff to nearby gully. (Pit D)	1. Chemical was removed. 2. Wastewater treatment facility was deployed on site. 3. Surface runoff was collected and treated properly.
22 September 2022	1. Drip tray should be provided for chemical storage. (Location B, Pit X) 2. Construction materials should be removed inside the tree protection zone. (Location B)	1. Chemical was removed. 2. Construction materials were removed from the tree protection zone.
27 September 2022	1. Drip tray should be provided for chemical storage. (Creative School	1. Chemical was removed.

Table 5.3 Site Observations (October 2022)

Date	Environmental Observations	Follow-up Status
7 October 2022	1. Drip tray shall be provided for chemical storage. (Pit O) 2. Site hoarding should be properly erected. (Pit L)	1. Chemical was removed. 2. Site hoarding was properly erected.
14 October 2022	1. Drip tray should be provided for chemical container (Pit D). 2. Surface runoff should be treated and avoid direct discharge to storm drain. (Pit D) 3. Oil leakage was observed at Shek Kok Road roundabout. Contractor was reminded to regular inspect the equipment and machine to ensure it is in good condition. 4. Contraction materials should not be stored in the tree protection zone. (Shek Kok Road roundabout) 5. Smoke emitting plants such as generator should be shielded by a screen near the pedestrian at Shek Kok Road Pit D1. 6. Gully should be covered and surrounded with sandbags to avoid soil/ sand drip in. (Shek Kok Road Pit D1)	1. Chemical was removed. 2. Surface runoff was treated before discharge. 3. Oil stain was cleared, and equipment was maintained properly to avoid further leakage. 4. Construction materials were removed. 5. Generator was removed on site. 6. Gully was surrounded with sandbags.
21 October 2022	1. Chemical containers shall be stored with drip tray. (Wan Po Road Workfront 1&4) 2. Gully should be covered and avoid soil drop in. (Wan Po Road Workfront 4) 3. Polluted water should be treated with wastewater treatment facility before discharge. (Wan Po Road Workfront 1&4) 4. Stockpile of dusty materials shall be covered properly. 5. Oil leakage shall be avoided. Contractor was reminded to regular inspect the condition of the equipment. (Wan Po Road Workfront 4)	1. Chemical was removed. 2. Gully was covered. 3. No polluted water was observed discharging to nearby gully. 4. Stockpile of dusty materials was covered properly. 5. Oil leakage was cleared.
26 October 2022	No observation was recorded during site inspection.	Nil

5.3. According to the EIA Study Report, Environmental Permit, contract documents and EM&A Manual, the mitigation measures detailed in the documents should be implemented as much as practical. An updated Implementation Status of Environmental Mitigation Measures (EMIS) is provided in Appendix C.

6. Landfill Gas Monitoring

6.1. Monitoring Requirements

6.1.1. In accordance with Section 11 of the EM&A Manual, monitoring of landfill gas is required for construction works within the 250m Consultation Zone. Part of the desalination plant and the indicative area of natural slope mitigation works fall within the SENT Landfill Extension Consultation Zone; and part of the 1,200 mm diameter freshwater mains along Wan Po Road falls within the SENT Landfill and SENT Landfill Extension Consultation Zones, TKO Stage II/III Restored Landfill and TKO Stage I Restored Landfill Consultation Zones.

6.2. Monitoring Location

6.2.1. Monitoring of oxygen, methane, carbon dioxide and barometric pressure was performed for excavations at 1m depth or more within the Consultation Zone.

6.2.2. During construction of works within the consultation zones, excavations of 1m depth or more was monitored:

· At the ground surface before excavation commences;

· Immediately before any worker enters the excavation;

· At the beginning of each working day for the entire period when the excavation remains open; and

· Periodically through the working day whilst workers are in the excavation.

6.2.3. For excavations between 300mm and 1m deep, measurements should be carried out:

· Directly after the excavation has been completed; and

· Periodically whilst the excavation remains open.

6.3. Monitoring Parameter

6.3.1. Landfill Gas monitoring was carried out to identify any migration between the landfill and the Project and to ensure the safety of the construction, operation and maintenance personnel working on-site, visitors and any other person within the Project area.

6.3.2. The following parameters were monitored:

· Oxygen;

· Carbon Dioxide;

· Barometric Pressure

· Methane;

6.3.3. The monitoring methodology and equipment could be referring to Section 4.5 of the Monthly Report.

6.4. Action and Limit Level

6.4.1. Action and Limit Level are presented in Table 6.1.

Table 6.1 Action and Limit Level for Landfill Gas Monitoring

Parameters	Action Level	Limit Level
Oxygen (O₂)	<19% O₂	<19% O₂
Methane (CH₄)	>10% LEL	>20% LEL
Carbon Dioxide (CO₂)	>0.5% CO₂	>1.5% CO₂

6.5. Monitoring Result

6.5.1. In the reporting quarter, landfill gas monitoring was carried out by the Registered Safety Officer of the Contractor at the excavation locations for 1905 times. No action or limit level exceedance was recorded in the reporting quarter. The landfill gas monitoring results could be referring to Appendix J of the Monthly EM&A Report.

7. Conclusion and Recommendations

7.1. This is the 17^th quarterly Environmental Monitoring and Audit (EM&A) Summary Report prepared by ASCL. This report presents the EM&A works carried out during the period of 1 August to 31 October 2022 in accordance with the EM&A Manual and the requirement under EP-503/2015/A.

7.2. 13 times of noise impact monitoring were conducted in the reporting quarter at NSR4 Creative Secondary School since projected-related construction activities were undertaken within a radius of 300m from the monitoring location.

7.3. No Action or Limit Level exceedance of construction noise was recorded during the reporting quarter.

7.4. No landfill gas monitoring exceedance was recorded in the reporting quarter.

7.5. Weekly environmental site inspection was conducted during the reporting quarter. Minor deficiencies were observed during site inspection and were rectified. The environmental performance of the Project was therefore considered satisfactory.

7.6. According to the environmental site inspections performed in the reporting quarter, the Contractor is reminded to pay attention on proper storage of chemical and maintaining site tidiness. The Contractor is also reminded to consider the treatment of wastewater from the construction site area.

7.7. No environmental complaint, notification of summons and prosecution was received in the reporting quarter.

7.8. The ET will keep track on the construction works to confirm compliance of environmental requirements and the proper implementation of all necessary mitigation measures.

7.9. Statistics on complaints and regulatory compliance are summarized in Appendix E.

Rev.	Description of Modification	Date
1.0	1^st Submission	11/05/2023
2.0	Revised according to IEC’s comment	15/05/2023

EXECUTIVE SUMMARY