Revision History

Rev.

Description of Modification

Date

1.0

1st Submission

21/12/2023

2.0

2nd Submission

22/12/2023

 

 

TABLE OF CONTENTS

EXECUTIVE SUMMARY.. 1

1.      Basic Project Information.. 2

2.      Noise Monitoring. 5

3.      Waste Management. 9

4.      Summary of Exceedance, Complants, Notification of Summons and Prosecutions. 9

5.      EM&A Site Inspection.. 10

6.      Landfill Gas Monitoring. 12

7.      Conclusion and Recommendations. 14

 

 

Appendix A                   Master Programme

 

Appendix B                   Overview of Mainlaying in Tseung Kwan O

 

Appendix C                   Summary of Implementation Status of Environmental Mitigation (EMIS)

 

Appendix D                  Summary of Exceedance

 

Appendix E                   Complaint Log

 

Appendix F                  Event/ Action Plan for Noise and Landfill Gas

 

Appendix G                   Waste Flow Table

 


EXECUTIVE SUMMARY

A1.          Penta-Ocean - Concentric Joint Venture (POCJV) is contracted to carry out the Mainlaying in Tseung Kwan O under Contract No. 13/WSD/16 (hereinafter known as “the Project”).

A2.          In accordance with the Environmental Monitoring and Audit (EM&A) Manual for the Project, EM&A works should be carried out by Environmental Team (ET), Acuity Sustainability Consulting Limited (ASCL), during the construction phase of the Project.

A3.          The construction works of Mainlaying in Tseung Kwan O were commenced on 30 August 2018. This is the 21st 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 2023.

A4.          All the environmental monitoring works were conducted in accordance with the EM&A Manual. The monitoring results were checked and reviewed. Site audits were conducted once per week. The implementation of the environmental mitigation measures, Event Action Plans and environmental complaint handing procedures were also checked.

A5.          A summary of the monitoring activities undertaken in this reporting period is listed below:

Monitoring Activities

Frequency

Daytime Noise monitoring

13 times

Landfill Gas Monitoring

1008 times

Environmental Site Inspection

14 times

                   

A6.          All construction noise monitoring was conducted as scheduled in the reporting quarter. No Action or Limit Level exceedance for construction noise monitoring was recorded in the reporting quarter.

A7.          No Action or Limit Level exceedance of landfill gas monitoring was recorded in the reporting quarter.

A8.          No environmental complaint, notification of summons and prosecution was received in the reporting quarter. The Complaint Log is presented in Appendix E.

A9.          There were no changes to be reported that may affect the on-going EM&A programme.


1.                Basic Project Information

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 freshwater 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 21st Quarterly EM&A Report for the Project which summarizes the key findings of the EM&A programme during the reporting period from 1 August 2023 to 31 October 2023.

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 activities carried in the reporting month

Wan Po Road and TKO Area 137

·      Hydrostatic Pressure test

·      Water main installation inside sleeve pipe

·      Trenchless method (sleeve pipe)

·      Hydrostatic Pressure test

·      Pipe cleaning

TKO Promenade (Stage 1 Landfill) & Po Yap Road Roundabout

·      Open trench method

·      Chamber Construction

·      Water main installation inside sleeve pipe

·      Hydrostatic Pressure test

·      Pipe cleaning

HK Velodrome

·      Open trench method

·      Water main installation inside sleeve pipe

·      Hydrostatic Pressure test

·      Pipe cleaning

Po Lam Road South / Ling Hong Road

·      Open trench method

·      Water main installation inside sleeve pipe

·      Trenchless method (sleeve pipe)

·      Pipe cleaning

Tsui Lam Road / Abandoned Road

·      Open trench method

·      Trenchless method (sleeve pipe)

·      Hydrostatic Pressure test

·      Pipe cleaning

 

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 No.

Valid Period

Status

Remark

From

To

Variation of Environmental Permit

EP no.: EP-503/2015/A

--

--

Valid

N/A

Notification of Construction Works under the Air Pollution Control (Construction Dust) Regulation

423775

--

--

Valid

N/A

Chemical Waste Producer Registration

5213-839-P3287-01

--

--

Valid

N/A

Billing Account for Disposal of Construction Waste

A/C no.: 7029491

--

--

Valid

N/A

Water Discharge Licence

WT00032336-2018

10 Dec 2018

31 Dec 2023

Valid

N/A

Construction Noise Permit (CNP)

GW-RE0109-23

8 Feb 2023

31 Mar 2023

Expired

Po Shun Road near junction of Wan Po Road

GW-RE0091-23

6 Feb 2023

29 Apr 2023

Expired

Construction site near junction of Wan Po Road and Pung Loi Road

 

 

 

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 (LAeq). Leq 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 NSR24 and NSR31. Thus, no construction noise monitoring was carried out at NSR24 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 21 August 2023, 22 September 2023 and 24 October 2023.

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 2023)

Date

Environmental Observations

Follow-up Status

1 Aug 2023

The chemical container should be stored

in drip dray in Pit E.

The chemical was removed

9 Aug 2023

1. The drip tray should be provided to generator. (Pit O)

2. The empty chemical container should be properly disposed or removed on site. (Pit O)

3. The smoke emission from the generator was observed during the site inspection. The Contractor should repair the generator to reduce emission. The Contractor also reminded that the smoke emission from the plant shall not

exceed Shade 1 on Ringelmann Chart continuously for 30 seconds at any time.

(Pit O1)

1. Generator was removed.

2. The chemical container was removed.

3. The generator was repaired to reduce the smoke emission.

16 Aug 2023

No major environmental deficiency was observed during site inspection.

N/A

21 Aug 2023

The oil container was found on the site area. The Contractor should provide the

drip tray to store the oil container. (Pit O)

The oil container was removed.

30 Aug 2023

Drip tray should be provided for chemical container.

Chemical container was. removed.

Table 5.2 Site Observations (September 2023)

Date

Environmental Observations

Follow-up Status

5 Sept 2023

1. Rock breaker should be placed on tarpaulin sheet (Pit D)

2. Paint leakage was observed (Pit D)

1. The rock breaker was removed.

2. Paint leakage was cleaned.

13 Sept 2023

1. Drip tray should be provided for chemical container (Pit D)

2. Stockpile of dusty materials should be covered with tarpaulin sheet (Area A)

1. Chemical containers were removed.

2. Stockpile of dusty materials was covered with tarpaulin sheet.

22 Sept 2023

1. Sandbag should be placed surrounding the drainage to prevent muddy water flowing into the drainage in Pit D.

2. Chemical container should be placed on drip tray to prevent ant leakage in Pit D and Shek Kok Road.

1. Sandbags were placed under the water safety barriers to prevent muddy water flowing into the drainage.

2. Drip tray was provided.

29 Sept 2023

No major environmental deficiency was observed during site inspection.

N/A

 

Table 5.3 Site Observations (October 2023)

Date

Environmental Observations

Follow-up Status

4 Oct 2023

Oil stain was found in the site (Creative School)

Oil stain was cleaned.

12 Oct 2023

Muddy water should not discharge directly to drainage. The Muddy water should be treated before discharge (Pit D & Shek Kok Road)

The water pumping was stopped.

17 Oct 2023

Chemical should be stored properly /place it on drip tray in Pit P

Chemical was placed on drip tray.

24 Oct 2023

No major environmental deficiency was observed during site inspection.

N/A

31 Oct 2023

No major environmental deficiency was observed during site inspection.

N/A

 

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 for landfill gas monitoring 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 1008 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 21st 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 2023 to 31 October 2023 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.             One (1) environmental complaint was received in the reporting quarter

7.8.             No notification of summons and prosecution was received in the reporting quarter.

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

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