Monitoring Activities	Frequency
Daytime Noise monitoring	13 times
Landfill Gas Monitoring	2004 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 16^th Quarterly EM&A Report for the Project which summarizes the key findings of the EM&A programme during the reporting period from 1 May to 31 July 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	Mainlaying from Pit A to Wan Po Road and pipe installation works inside sleeve pipe
Pit B	Construction of combined chamber and pipe installation works inside sleeve pipe
Pit C	Construction of washout chamber and excavation from Pit C to 900 S.V. chamber and pipe installation works inside sleeve pipe
Wan Po Road
Workfront 1	Excavation and ELS works for jacking pit 1and Mainlaying from Pit 1 to Pit 2
Workfront 2	Setup for MTBM pipe jacking and Mainlaying from Pit 1 to Pit 2
Workfront 3	Pipe trench excavation and pipe laying and SRT and pavement carriageway
Workfront 4	Pipe trench excavation, pipe laying and pipe installation inside sleeve pipe
Workfront 5	MTBM pipe jacking and Pipe trench excavation and pipe laying
Pit A	Setup Platform for hand-shield
Pit A1 – Pit B	Pipe trench excavation, pipe laying and reinstatement works
Pit B – Pit C	Trench excavation and pipe laying
Shek Kok Road
Pit D – Pit C1	MTBM pipe jacking and Trench excavation and pipe laying
Wing wall hand-shield	Construction of wing wall and Setup for Hand-shield pipe jacking
Lohas Park Road
Tower 1	Wing wall construction
Pet Garden’s	Trench excavation and pipe laying and reinstatement works
Creative School	Construction of flood protection wall and re-construction of u-channel Trench excavation and pipe laying works concrete surround
Pung Loi Road
Pit WPR1	Set up for MTBM pipe jacking and MTBM pipe jacking
Pit G1A	Pipe laying inside sleeve pipe
Pit J1A	Pipe laying inside sleeve pipe
Velodrome
Pit K	Grouting for sleeve pipe and construction of concrete thrust block
Pit L – Pit M	Pressure testing of water pipeline
Pit M	Set up for Pressure testing of water pipeline and pipe laying
Pit N	Pressure testing of water pipeline
Pit O – Pit P	Site setup works for trenchless works and Grouting
Ling Hong Road
Control site 108	Ladder installation for DN900 S.V. chamber
Po Lam Road
PLR South	Trench excavation and pipe laying works
Pit X	Backfilling and Inspection chamber installation
B3	Trench excavation and pipe laying
B4	Trench excavation and pipe laying
C2	Building for pier 1 & 2
D2	Trench excavation and pipe laying works
Tsui Lam Road
--	Predrilling for mini pile and steel cage installation and grouting for mini pile
TKO Primary Service Reservoir
--	Trench excavation and pipe laying

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	-
GW-RE0329-22	Until 1 Oct 2022	-
GW-RE0330-22	Until 1 Oct 2022	-
GW-RE0353-22	Until 1 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 and 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 and 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 and 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 27 May, 27 June, 26 July 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 (May 2022)

Date	Environmental Observations	Follow-up Status
6 May 2022	1. Stockpile of dusty materials should be covered properly with impervious materials/ sheeting (Ma Wo Shui Abundant Road). 2. Shelter should be provided for cement mixing works (Pit O).	1. Stockpile of dusty materials was removed off-site. 2. Cement mixing works were carried out inside the sheltered area.
12 May 2022	1. Drip tray should be provided for chemical storage. (Pit X & Location A). 2. Slop surface should be covered during rainy season (Pit X). 3. To clean the public road regularly and avoid muddy runoff flow to public area. (Po Lam South Road)	1. Drip tray was provided for chemical storage. 2. Slop surface was covered properly. 3. Public road was cleaned regularly.
20 May 2022	1. Wastewater/ Seepage water should be treated properly to comply with the discharge standard of Water Discharge licence before discharge. (Wan Po Road Work Fount 1) 2. Drip tray should be provided for chemical storage. (Wan Po Road Work Fount 1)	1. Wastewater was treated properly to comply with the Discharge licence standard before discharge. 2. Drip tray was provided for chemical storage.
27 May 2022	No major observation was recorded on the respective day.

Table 5.2 Site Observations (June 2022)

Date	Environmental Observations	Follow-up Status
1 June 2022	No major observation was recorded on the respective day.
9 June 2022	1. Drip tray should be provided for chemical storage (HK Velodrome Park Pit O). 2. Empty chemical container should be stored at a designated area (HK Velodrome Park Pit O).	1. Drip tray was provided for chemical storage. 2. Empty chemical containers were stored in the chemical waste container.
17 June 2022	1. Drip tray should be provided for chemical storage (HK Velodrome Park Pit O).	1. Drip tray was provided for chemical storage.
24 June 2022	No major observation was recorded on the respective day.
27 June 2022	No major observation was recorded on the respective day.

Table 5.3 Site Observations (July 2022)

Date	Environmental Observations	Follow-up Status
7 July 2022	1. Drip tray should be provided for chemical storage at WPR C1.	1. Chemical was removed.
14 July 2022	No major observation was recorded on the respective day.
22 July 2022	1. Gully should be covered/ sealed properly during exaction. (Shek Kok Road roundabout) 2. Drip tray should be provided for chemical storage (Creative School) 3. Muddy surface runoff should be collected and treated properly, and the treated wastewater should comply with the Water Discharge Licence standard (Creative School)	1. Gully was covered properly. 2. Chemical was removed. 3. Exposed slope surface near the drainage was hard paved and muddy surface runoff was collected and treated properly before discharge.
26 July 2022	1. Muddy water should be collected properly and avoid discharge to nearby gully at Shek Kok Road roundabout	1. Muddy water was collected properly and avoid discharge to nearby gully.

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 2004 times. No action and 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 16^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 May to 31 July 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 and 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	02/11/2022
2.0	Revised according to IEC’s comments	10/11/2022

EXECUTIVE SUMMARY