Issues	Environmental Monitoring Parameters / Inspection	Sessions
Air Quality	1-Hour TSP	2265
24-Hour TSP	657
Construction Noise	Leq (30min) Daytime	902
Leq (5min) Evening	118
Leq (5min) Night	12
Water Quality	Marine Water Sampling	216
Inspection / Audit	Contract 1	ET Regular Environmental Site Inspection	334
Joint site audit with Project Consultant and IEC	76
Contract 2	ET Regular Environmental Site Inspection	327
Joint site audit with Project Consultant and IEC	74

Environmental Issues	Monitoring Parameters	Exceedances
Air Quality	1-Hour TSP	0	0	0
24-Hour TSP	0	0	0
Construction Noise	Leq_30minDaytime	31	0	31
Leq_5minEvening	1	95	96
Leq_5minNight	6	15	21
Water Quality (Marine Water)	DO	3	17	20
Turbidity	0	0	0
SS	19	16	35

Table of Contents

2 Project Organization and Construction progress and Submission 5

2.1 Project Organization 5

2.2 Major Construction Activities 6

2.3 Summary of Environmental Submissions 7

3 Summary of Environmental Monitoring Programmes and Requirements 9

3.1 General 9

3.2 Monitoring Parameters 9

3.3 Monitoring Locations 9

3.4 Monitoring Frequency and Period 11

3.5 Monitoring Equipment 11

3.6 Monitoring Procedures 13

3.7 Determination of Action/Limit (A/L) Levels 16

3.8 Data Management and Data QA/QC Control 17

4 Air Quality Monitoring 18

4.1 General 18

4.2 Results Of Air Quality Monitoring 18

4.3 Conclusion and Recommendations 18

5 Construction Noise Monitoring 20

5.1 General 20

5.2 Results of Noise Monitoring 20

6 Water Quality Monitoring 22

6.1 General 22

6.2 Results of water monitoring 22

6.3 Conclusions and Recommendations 24

7 Waste Management 25

7.1 General Waste Management 25

7.2 Records of Waste Quantities 25

7.3 Effectiveness Of Solid and Liquid Waste Management 26

8 Site Inspection 27

8.1 Requirements 27

8.2 Findings / Deficiencies During Construction Period 27

9 Landfill Gas Monitoring 28

9.1 General Requirement 28

9.2 Limit Levels and Event and Action Plan 28

9.3 Landfill Gas Monitoring 28

10 Environmental Complaint and Non-Compliance 30

10.1 Environmental Complaint, Summons and Prosecution 30

11 Implementation Status of Mitigation Measures 31

11.1 General Requirements 31

11.2 Noise Mitigation Measure during Operation of the Project 31

12 Conclusions and Recommendations 33

12.1 Conclusions 33

12.2 Recommendations 34

List of TABLES

Table 2-1 Documents Submission under Environmental Permit Requirement

Table 3-1 Summary of EM&A Requirements

Table 3-2 Designated Air Quality Monitoring Location recommended in EM&A Manual

Table 3-3 Designated Construction Noise Monitoring Location recommended in EM&A Manual

Table 3-4 Designated and interim alternative location for air quality and noise monitoring in the Construction Period

Table 3-5 Location of Water Quality Monitoring Station

Table 3-6 Air Quality Monitoring Equipment

Table 3-7 Construction Noise Monitoring Equipment

Table 3-8 Water Monitoring Equipment

Table 3-9 Testing Method and Reporting Limit of the Chemical Analysis

Table 3-10 Action and Limit Levels for Air Quality

Table 3-11 Action and Limit Levels for Construction Noise

Table 3-12 Action and Limit Levels for Water Quality

Table 4-1 Summary of 1-hour TSP Monitoring Results

Table 4-2 Summary of 24-hour TSP Monitoring Results

Table 4-3 Summary of Breaches of Air Quality A/L Levels

Table 5-1 Summary of Daytime Construction Noise Impact Monitoring results

Table 5-2 Summary of Additional Evening time Construction Noise Impact Monitoring results

Table 5-3 Summary of Additional Night time Construction Noise Impact Monitoring results

Table 5-4 Summary of Breaches of Construction Noise A/L Levels

Table 6-1 Summary of Dissolved Oxygen, Turbidity and Suspended Solids of the Water Quality Monitoring Results at Mid-Ebb Tide in the Construction Period

Table 6-2 Summary of Dissolved Oxygen, Turbidity and Suspended Solids of the Water Quality Monitoring Results at Mid-Flood Tide in the Construction Period

Table 6-3 Summary of Breaches of Water Quality A/L Levels

Table 7-1 Summary of Quantities of Inert C&D Materials

Table 7-2 Summary of Quantities of C&D Wastes

Table 8-1 Summary of Site Inspection

Table 9-1 Actions in the Event of Landfill Gas Being Detected in Excavations

Table 9-2 Summary of Landfill Gas Measurement Results

Table 10-1 Statistical Summary of Environmental Complaints

Table 10-2 Statistical Summary of Environmental Summons

Table 10-3 Statistical Summary of Environmental Prosecution

Table 11-1 Environmental Mitigation Measures in the Reporting Month

Table 11-2 Noise Mitigation Measure during Operation of the Project

List of Appendices

Appendix A Project Layout Plan

Appendix B Project Organization Chart & Contact Details of Key Personnel

Appendix C Monitoring Location (Air Quality, Noise and Water Quality)

Appendix D Event and Action Plan

Appendix E Graphical plots of Monitoring Results

Appendix F Waste Flow Table

Appendix G Meteorological Data

Appendix H Implementation Schedule for Environmental Mitigation Measures (ISEMM)

Appendix I Complaint Log

1. Introduction

1.1 Project Background

1.1.1 Civil Engineering and Development Department (hereafter referred as “CEDD”) is the Project Proponent and the Permit Holder of the Project Cross Bay Link, Tseung Kwan O (hereinafter referred as “the Project”) which is a Designated Project to be implemented under Environmental Permit number EP-459/2013 (hereinafter referred as “the EP-459/2013” or “the EP”).

1.1.2 AUES was awarded the CEDD Contract Agreement No. EDO/04/2018 - Environmental Team for Cross Bay Link, Tseung Kwan O (hereinafter called “the Service Contract”). The Services under the Service Contract is to provide environmental monitoring and audit (EM&A) services for the Works Contracts pursuant to the requirement of Environmental Team (ET) under the Approved EM&A Manual to ensure that the environmental performance of the Works Contracts comply with the requirement specified in the EM&A Manual and EIA Report of Agreement No. CE 43/2008 (HY) Cross Bay Link, Tseung Kwan O - Investigation and other relevant statutory requirements.

1.1.3 To facilitate management, the proposed Works of Cross Bay Link, Tseung Kwan O (hereinafter called “the Project’) was divided into two Civil Engineering and Development Department (CEDD) Works contracts included Contract 1 (Contract No. NE/2017/07) and Contract 2 (Contract No. NE/2017/08). The details of each contract Works are summarized below and the delineation of each contract is shown in Appendix A.

Contract 1 (Contract No. NE/2017/07)

(i) 400m section of marine viaducts of steel deck sections including the Eternal Arch Bridge;

(ii) 600m section of marine viaducts of concrete deck sections;

(iii) An E&M Plantroom and associated building services; and

(iv) E&M provisions.

Contract 2 (Contract No. NE/2017/08)

(i) Elevated deck structures along Road D9;

(ii) A 210m section of cycle track and footpath ramp bridge;

(iii) A 630m section of noise semi-enclosure covering the entire length of Road D9, and;

(iv) Lift, staircase, modification of existing seawall along Road D9, landscaping and miscellaneous works.

1.1.4 The date for commencement of Contract 1 is 3^rd December 2018 while the date for commencement of Contract 2 is 17^th January 2019.

1.1.5 As part of the EM&A programme, baseline monitoring shall be undertaken before the Project construction work commencement to determine the ambient environmental condition. The baseline air quality, background noise and water quality monitoring has been carried out between 21^st September 2018 and 13^th November 2018 at the designated and interim locations. The baseline monitoring report under the EP-459/2013 has been compiled by the ET and verified by Independent Environmental Checker (hereinafter the “IEC’) prior submitted to EPD on 19^th November 2018 for endorsement.

1.1.6 Since all the Work Contracts under the Project have been completed and it is confirmed that all construction activities that have the potential to result in a significant environmental impact were completed, a proposal was prepared and submitted to EPD to terminate the Construction Phase EM&A program for the Project. The proposal was approved by EPD on 15^th April 2025 and the construction phase EM&A Programme was terminated on 30^th April 2025.

1.1.7 This is the Final EM&A Report of Construction Phase for Contract 1 and 2 (hereinafter 'the Construction Period'), summarizing the monitoring results and inspection findings during the construction period from 3^rd December 2018 to 30^th April 2025.

1.2 Report Structure

1.2.1 The Final EM&A Report is structured into the following sections:-

*Section 1*	Introduction
*Section 2*	Project Organization and Construction Progress
*Section 3*	Summary of Impact Monitoring Requirements
*Section 4*	Air Quality Monitoring
*Section 5*	Construction Noise Monitoring
*Section 6*	Water Quality Monitoring
*Section 7*	Waste Management
*Section 8*	Site Inspections
*Section 9*	Landfill Gas Monitoring
*Section 10*	Environmental Complaints and Non-Compliance
*Section 11*	Implementation Status of Mitigation Measures
*Section 12*	Conclusions and Recommendations

2 Project Organization and Construction progress and Submission

2.1 Project Organization

2.1.1 The project organization is shown in Appendix B. The responsibilities of respective parties are:

The Project Consultant

2.1.2 The Project Consultant (hereinafter “the Consultant”) is responsible for overseeing the construction works and for ensuring that the works are undertaken by the Contractor in accordance with the specification and contract requirements. The duties and responsibilities of the Consultant with respect to EM&A are:

· Monitor the Contractors’ compliance with contract specifications, including the implementation and operation of the environmental mitigation measures and their effectiveness

· Monitor Contractors’, ET’s and IEC’s compliance with the requirements in the Environmental Permit (EP) and EM&A Manual

· Facilitate ET’s implementation of the EM&A programme

· Participate in joint site inspection by the ET and IEC

· Oversee the implementation of the agreed Event / Action Plan in the event of any exceedance

· Adhere to the procedures for carrying out complaint investigation

The Contractor(s) of Works Contract(s)

2.1.3 There will be one contractor for each individual works contract. The Contractor(s) should report to the Consultant. The duties and responsibilities of the Contractor are:

· Comply with the relevant contract conditions and specifications on environmental protection

· Participate in the site inspections by the ET and IEC, and undertake any corrective actions

· Provide information / advice to the ET regarding works programme and activities which may contribute to the generation of adverse environmental impacts

· Submit proposals on mitigation measures in case of exceedances of Action and Limit levels in accordance with the Event / Action Plans

· Implement measures to reduce impact where Action and Limit levels are exceeded

· Adhere to the procedures for carrying out complaint investigation

Environmental Team (ET)

2.1.4 ET shall not be in any way an associated body of the Contractor(s) and employed by the Permit Holder (i.e., CEDD) to conduct the EM&A programme. The ET should be managed by the ET Leader. The ET Leader shall be a person who has at least 7 years’ experience in EM&A and has relevant professional qualifications. Suitable qualified staff should be included in the ET, and resources for the implementation of the EM&A programme should be allocated in time under the Contract(s), to enable fulfillment of the Project’s EM&A requirements as specified in the EM&A Manual during construction of the Project. ET shall report to the Project Proponent and the duties shall include:

· Conduct baseline monitoring, impact monitoring and post-construction monitoring and the associated in-situ and laboratory tests to monitor various environmental parameters as required in the EM&A Manual and the EP

· Analyze the environmental monitoring and audit data, review the success of EM&A programme and the adequacy of mitigation measures implemented, confirm the validity of the EIA predictions and identify any adverse environmental impacts arising

· Carry out regular site inspection to investigate and audit the Contractors’ site practice, equipment/plant and work methodologies with respect to pollution control and environmental mitigation, and effect proactive action to pre-empt problems

· Monitor compliance with conditions in the EP, environmental protection, pollution prevention and control regulations and contract specifications

· Audit environmental conditions on site

· Report on the environmental monitoring and audit results to EPD, the Consultant, the IEC and Contractor(s) or their delegated representatives

· Recommend suitable mitigation measures to the Contractor in the case of exceedance of Action and Limit levels in accordance with the Event and Action Plans

· Liaise with the IEC on all environmental performance matters and timely submit all relevant EM&A proforma for approval by IEC

· Advise the Contractor(s) on environmental improvement, awareness, enhancement measures etc., on site

· Adhere to the procedures for carrying out complaint investigation

· Set up a dedicated website where the project information, all environmental monitoring and audit data and reports described in Condition 5.2 of the EP, and all finalized submissions and plans required under the EP are to be placed for public inspection

· Upload the environmental monitoring results to the dedicated website in accordance with requirements of the EP and EM&A Manual

· To carry out the Operational Phase Landfill Gas monitoring during effluent drainage system maintenance for one year

Independent Environmental Checker (IEC)

2.1.5 IEC will be employed for this Project. The Independent Environmental Checker (IEC) should not be in any way an associated body of the Contractor(s) or the ET for the Project. The IEC should be employed by the Permit Holder (i.e., CEDD) prior to the commencement of the construction of the Project. The IEC should have at least 7 years’ experience in EM&A and have relevant professional qualifications. The duty of IEC should be:

· Provide proactive advice to the Project Consultant and the Project Proponent on EM&A matters related to the project, independent from the management of construction works, but empowered to audit the environmental performance of construction

· Review and audit all aspects of the EM&A programme implemented by the ET

· Review and verify the monitoring data and all submissions in connection with the EP and EM&A Manual submitted by the ET

· Arrange and conduct regular, at least monthly site inspections of the works during construction phase, and ad hoc inspections if significant environmental problems are identified

· Check compliance with the agreed Event / Action Plan in the event of any exceedance

· Check compliance with the procedures for carrying out complaint investigation

· Check the effectiveness of corrective measures

· Feedback audit results to ET by signing off relevant EM&A proforma

· Check that the mitigation measures are effectively implemented

· Report the works conducted, the findings, recommendation and improvement of the site inspections, after reviewing ET’s and Contractor’s works, and advices to the Project Consultant and Project Proponent on a monthly basis.

2.2 Major Construction Activities

2.2.1 The commencement of Contract 1 is on 3^rd December 2018. The major construction activities undertaken throughout the Construction Period included:

Contract 1 (Contract No: NE/2017/07)

Ÿ Site Clearance Work at Works Area A

Ÿ Site Office Setup at Works Area A

Ÿ Pre-drilling works at Portion II

Ÿ Piling works at Portion II

Ÿ Concrete Work at Portion V & Portion II

Ÿ Structure Steelwork at Portion V

Ÿ Metal work at Works Area A

Ÿ Precast Pier and box girder installation at Portion II

Ÿ Stage Concrete for pile caps at portion II

Ÿ Welding of steel bracket for precast shell installation at Portion II

Ÿ Preparation of precast shell fabrication at Portion II

Ÿ Precast shell erection and fabrication at Portion II

Ÿ ABWF works, E&M Work and External Work at Portion V Plant Room Building

Ÿ Load-out and Transportation of Steel Main Bridge

Ÿ Load-out and Transportation of Floating-in of Steel Bridge Side Span

Ÿ Fabrication of bottom deck panels, top deck panels and diaphragm panels at Portion II

Ÿ Structure works for E&M Building

2.2.2 The commencement of Contract 2 is on 17^th January 2019. The major construction activities undertaken throughout the Construction Period included:

Contract 2 (Contract No. NE/2017/08)

Ÿ Site Clearance Work at Portion III and VI

Ÿ Initial Survey at Portion III and VI

Ÿ UU Detection Work at Portion III and VI

Ÿ Fencing Erection Work at Portion II and VI

Ÿ Trial Pit and Pre-drill Work at Portion VI

Ÿ Bored Pile Work at Portion IV & VI

Ÿ Sheet Pile Work at Portion VI

Ÿ Excavation Work at Portion VI

Ÿ Wheel Washing Facilities Construction at Portion VI

Ÿ RC construction for U-trough(Portion III)

Ÿ Seawall modification

Ÿ ELS & manhole construction at SMH012 &SMH011,lift shaft

Ÿ Noise barrier installation(Portion VI)

Ÿ Backfilling (Portion VI)

Ÿ Drainage Installation Work (Portion III)

Ÿ Footpath and cycle track paving work

2.3 Summary of Environmental Submissions

2.3.1 The required documents list below shall be to submit to EPD for retention:

Table 2-1 Documents Submission under Environmental Permit Requirement

EP condition	Submission to EPD	Requirement	Situation
1.11	Commencement date of construction of the Project	no later than 1 month prior to the commencement of construction of the Project	Ÿ Contract 1 notified EPD on 19 Oct 2018 Ÿ Contract 2 notified EPD on 12 Dec 2018
2.3	The date of setting up the Community Liaison Group (CLG), the membership, the terms of reference and the contact details	At least 1 month before the commencement of construction of the Project	Ÿ CLG setting has submitted to EPD on 9 Oct 2018
2.4	Management Organization of Main Construction Companies	No later than 2 weeks before the commencement of construction of the Project	Ÿ Management Organization of Contract 1 was submitted to EPD on 2 October 2018 Ÿ Management Organization of Contract 2 was submitted to EPD on 12 December 2018
2.5	Waste Management Plan (WMP)	No later than 1 month before commencement of construction of the Project	Ÿ WMP of Contract 1 was submitted to EPD in 11 October 2018 Ÿ WMP of Contract 2 was submitted to EPD in 14 December 2018
2.6	Landscape Mitigation Plan (LSMP)	No later than 1 month before commencement of construction of the Project	Ÿ LSMP was submitted on 1 Nov 2018
2.7	Detailed Qualitative Landfill Gas Hazards Assessment (QLGHA)	No later than 1 month before commencement of construction of the Project	Ÿ QLGHA of the Project was submitted to EPD on 1 November 2018

2.3.2 Upon completed baseline monitoring, a Baseline Monitoring Report was verified by IEC on 19 November 2018 and submitted to EPD on that day for endorsement.

2.3.3 The notification of Project dedicated website to EPD was made on 9 January 2019 (http://www.envcbltko.hk/).

3 Summary of Environmental Monitoring Programmes and Requirements

3.1 General

3.1.1 The Environmental Monitoring and Audit Programmes and requirements are set out in the Approved EM&A manual. Environmental issues such as air quality, construction noise and water quality were identified as the key issues during the construction phase of the Project. A summary of EM&A programmes and requirements are presented in the sub-sections below.

3.2 Monitoring Parameters

3.2.1 Monitoring parameters of air quality, noise and water quality are summarized in Table 3-1.

Table 3-1 Summary of EM&A Requirements

Environmental Issue	Parameters
Air Quality	Ÿ 1-hour TSP by Real-Time Portable Dust Meter; and Ÿ 24-hour TSP by High Volume Air Sampler
Noise	Ÿ Leq (30min) in six consecutive Leq(5min) between 07:00-19:00 on normal weekdays Ÿ Supplementary information for data auditing, statistical results such as L₁₀ and L₉₀ shall also be obtained for reference.
Water Quality	Ÿ In-situ measurement – Dissolved Oxygen (DO) concentration (mg/L) & saturation (%), pH, Salinity (mg/L), Temperature (ºC) and Turbidity (NTU); and Ÿ Laboratory analysis – SS (mg/L)

3.3 Monitoring Locations

Air Quality and Construction Noise

3.3.1 According to the Approved EM&A Manual Section 5.4 and Section 6.3, three (3) representative air sensitive receivers (ASR) and four (4) representative noise sensitive receivers were designated as monitoring stations. The designated air quality and noise monitoring locations are listed in Table 3-2 and Table 3-3, and illustrated in Appendix C.

Table 3-2 Designated Air Quality Monitoring Location recommended in EM&A Manual

ID	Location in the EM&A Manual	Currently Situation
AM1	Tung Wah Group of Hospitals Aided Primary School & Secondary School	Not yet construct
AM2	Lohas Park Stage 2 (Planned Development in Area 86)	Available for resident occupation in February 2021
AM3	Lohas Park Stage 3 (Planned Development in Area 86)	Available for resident occupation in April 2024

Table 3-3 Designated Construction Noise Monitoring Location recommended by EM&A Manual

ID	Location	Currently Situation
CNMS-1	Lohas Park Stage 1(Planned Development in Area 86, Package 4) (Southeast facade)	Available for resident occupation in November 2019
CNMS-2	Lohas Park Stage 1 (Planned Development in Area 86, Package 6) (Southeast facade)	Available for resident occupation in February 2021
CNMS-3	Lohas Park Stage 3 (Planned Development in Area 86, Package 11) (West facade)	Available for resident occupation in April 2024
CNMS-4	Tung Wah Group of Hospitals Aided Primary School & Secondary School (Southwest facade)	Not yet construct

3.3.2 As observed and confirmed by ET and IEC during the joint site visit on 29^th August 2018, the designated air quality and noise monitoring locations are under construction or yet to construct. It is considered that these designated locations are not appropriate to perform air quality and noise monitoring. In this regard, alternative locations were proposed as interim arrangement to carry out air quality and noise monitoring before occupation of the designated monitoring location. A letter enclosed with the alternative location proposal and IEC verification (Our Ref: TCS00975/18/300/L0038) was sent to EPD on 19^th October 2018 and the proposal was agreed by EPD. Therefore, air quality and construction noise impact monitoring would be performed at the agreed alternative locations until the designated sensitive receivers occupied and granted the premises.

3.3.3 Construction noise monitoring for Lohas Park Phase 4 was commenced in November 2019 while 1-Hour TSP air quality and construction noise monitoring for Lohas Park Phase 6 were commenced in February 2021 regarding the handover of residential units to purchasers. Since power supply is not available from Lohas Park Phase 6 and is only available near the site office after Cross Bay Link opened in December 2022, an interim alternative monitoring location AM2b was proposed for the 24-Hour TSP monitoring of Lohas Park Phase 6 due to the limitation on the power supply for the HVS.

3.3.4 Upon the handover of residential units of Lohas Park Phase 10 to purchasers, access permission for 1-Hour & 24-Hour TSP air quality and construction noise monitoring were requested. 1-Hour TSP air quality and construction noise monitoring for Lohas Park Phase 10 were commenced on 8 April 2024 upon approved by the Property Management Office of Lohas Park Phase 10 while installation of HVS for 24-Hour TSP monitoring was rejected by Property Management Office of Lohas Park Phase 10.

3.3.5 The designated and interim alternative monitoring location for impact air quality and noise monitoring in the Construction Period are summarized in Table 3-4 and illustrated in Appendix C.

Table 3-4 Designated and interim alternative location for air quality and noise monitoring in Construction Period

Location ID	Monitoring Parameter	Location
AM2	1-Hour TSP Air Quality	Lohas Park Phase 6
AM2b	24-Hour TSP Air Quality	Near Lohas Park Phase 6
AM3	1-Hour TSP Air Quality	Lohas Park Phase 10
AM4	1-Hour TSP Air Quality	Podium of Lohas Park Phase 2A (Le Prestige)
AM5	24-Hour TSP Air Quality	Boundary of Site Office near Junction of Wan Po Road and Wan O Road
CNMS-1	Noise (L_eq, L₁₀ & L₉₀)	Podium of Lohas Park Package 4
CNMS-2	Noise (L_eq, L₁₀ & L₉₀)	Lohas Park Package 6
CNMS-3	Noise (L_eq, L₁₀ & L₉₀)	Lohas Park Phase 10
CNMS-5	Noise (L_eq, L₁₀ & L₉₀)	Podium of Lohas Park Phase 2A (Le Prestige)

Remark: Since 24-Hour TSP Air Quality monitoring is not granted at AM4 Lohas Park Phase 2A, the 24-Hour TSP monitoring was therefore proposed at AM5 which is located at the boundary of the project site office.

Water Quality

3.3.6 According to Table 7.1 of the approved EM&A Manual Section 7.4, two Control Stations (C3 & C4), six (6) sensitive receivers (CC1, CC2, CC3, CC4, CC13 & SWI1) and one (1) Gradient station (I1) are recommended to perform water quality monitoring. Details and coordinate of these water quality monitoring stations are described in Table 3-5 and the locations is shown in Appendix C.

Table 3-5 Location of Water Quality Monitoring Station

Station	Coordinates		Description
Station	Easting	Northing	Description
CC1	843201	816416	Sensitive Receiver – Coral Sites at Chiu Keng Wan
CC2	844076	817091	Sensitive Receiver – Coral Sites at Junk Bay
CC3	844606	817941	Sensitive Receiver – Coral Sites at Junk Island
CC4	845444	815595	Sensitive Receiver – Coral Sites at Fat Tong Chau West
CC13	844200	817495	Sensitive Receiver – Coral Sites at Junk Bay near Chiu Keng Wan
SWI1	845512	817442	Sensitive Receiver – Tseung Kwan O Salt Water Intake
C3	843821	816211	Control Station (Ebb Tide) – within Junk Bay
C4	844621	815770	Control Station (Flood Tide) – within Junk Bay
I1	844602	817675	Gradient Station – in between Lam Tin Tunnel (LTT) and CBL

3.4 Monitoring Frequency and Period

3.4.1 To according with the approved EM&A Manual, impact monitoring requirements are presented as follows.

Air Quality Monitoring

3.4.2 Air quality impact monitoring frequency is as follows:

Ÿ Once every 6 days of 24-hour TSP and 3 times of 1-hour TSP monitoring; during course of works throughout the construction period

Construction Noise Monitoring

3.4.3 Construction noise monitoring frequency is as follows:

Ÿ One set of Leq_(30min)measurements in a weekly basis between 07:00 and 19:00 hours on normal weekdays during course of works as throughout the construction period

Ÿ If construction works are extended to include works during the hours of 1900-0700, additional weekly impact monitoring shall be carried out during evening and night-time works. Applicable permits under the NCO shall be obtained by the Contractor.

Water Quality (Marine Water) Monitoring

3.4.4 Marine water impact monitoring frequency is as follows:

Ÿ Three days a week, at mid ebb and mid flood tides during course of pile excavation works for the bridge pier foundations underway. Moreover, the intervals between 2 consecutive sets of monitoring day shall not be less than 36 hours.

3.5 Monitoring Equipment

Air Quality Monitoring

3.5.1 The 24-hour and 1-hour TSP levels shall be measured by following the standard high volume sampling method as set out in the Title 40 of the Code of Federal Regulations, Chapter 1 (Part 50), and Appendix B. If the ET proposes to use a direct reading dust meter to measure 1-hour TSP levels, it shall submit sufficient information to the IEC to prove that the instrument is capable of achieving a comparable results to the HVS. The instrument should be calibrated regularly, and the 1-hour sampling shall be determined on yearly basis by the HVS to check the validity and accuracy of the results measured by direct reading method. The filter paper of 24-hour TSP measurement shall be determined by HOKLAS accredited laboratory. The equipment used for air quality monitoring is listed in Table 3-6.

Table 3-6 Air Quality Monitoring Equipment

Equipment		Model
24-hour TSP	High Volume Air Sampler	TISCH High Volume Air Sampler, HVS Model TE-5170
24-hour TSP	Calibration Kit	TISCH Model TE-5025A
1- hour TSP	Portable Dust Meter	Sibata LD-5R Laser Dust Monitor or Sibata LD-3B Laser Dust Monitor

Noise Monitoring

3.5.2 Sound level meter in compliance with the International Electrotechnical Commission Publications 651: 1979 (Type 1) and 804: 1985 (Type 1) specifications shall be used for carrying out the noise monitoring. The sound level meter shall be checked using an acoustic calibrator. The wind speed shall be checked with a portable wind speed meter capable of measuring the wind speed in ms^-1. Noise equipment will be used for impact monitoring is listed in Table 3-7.

Table 3-7 Construction Noise Monitoring Equipment

Equipment	Model
Integrating Sound Level Meter	B&K Type 2238 or Rion NL-31 or Rion NL-52 or Rion NL-52A
Calibrator	B&K Type 4231 or Rion NC-74 or Rion NC-75
Portable Wind Speed Indicator	Anemometer AZ Instrument 8908

Water Quality Monitoring

3.5.3 For water quality monitoring, the equipment should fulfill the requirement under the Approved EM&A Manual Section 7.2. The requirement is summarized below:

• Dissolved Oxygen and Temperature Measuring Equipment – The instrument should be a portable, weatherproof dissolved oxygen measuring instrument completed with cable, sensor, comprehensive operation manuals, and should be operable from a DC power source. It should be capable of measuring: dissolved oxygen levels in the range of 0-20 mg/L and 0-200% saturation; and a temperature of 0-45 degrees Celsius. It should have a membrane electrode with automatic temperature compensation complete with a cable of not less than 35 m in length. Sufficient stocks of spare electrodes and cable should be available for replacement where necessary.

• Turbidity Measurement Equipment – The instrument shall be a portable, weatherproof turbidity-measuring instrument complete with comprehensive operation manual. The equipment shall use a DC power source. It shall have a photoelectric sensor capable of measuring turbidity between 0-1000 NTU.

• Salinity Measurement Instrument – A portable salinometer capable of measuring salinity in the range of 0-40 ppt should be provided for measuring salinity of the water at each monitoring location.

• Water Depth Detector – A portable, battery-operated echo sounder should be used for the determination of water depth at each designated monitoring station. A detector affixed to the bottom of the works boat, if the same vessel is to be used throughout the monitoring programme, is preferred.

• Positioning Device – hand-held or boat-fixed type digital Global Positioning System (GPS) with way point bearing indication or other equipment instrument of similar accuracy, should be provided and used during water quality monitoring to ensure the monitoring vessel is at the correct location before taking measurements.

• Water Sampling Equipment – A water sampler, consisting of a transparent PVC or glass cylinder of not less than two liters, which can be effectively sealed with cups at both ends, should be used. The water sampler should have a positive latching system to keep it open and prevent premature closure until released by a messenger when the sampler is at the selected water depth.

3.5.4 Equipment used for water quality impact monitoring is listed in Table 3-8.

Table 3-8 Water Monitoring Equipment

Equipment	Model
A Digital Global Positioning System	GPS12 Garmin
Water Depth Detector	Eagle Sonar CUDA 300
Water Sampler	A 2-litre transparent PVC cylinder with latex cups at both ends
Thermometer & DO meter	YSI ProDSS Digital Sampling System Water Quality Meter
pH meter
Turbidimeter
Salinometer
Sample Container	High density polythene bottles (provided by laboratory)
Storage Container	‘Willow’ 33-litter plastic cool box with Ice pad

3.6 Monitoring Procedures

Air Quality

1-hour TSP

3.6.1 The 1-hour TSP monitor was a brand named “Sibata LD-3 Laser Dust monitor Particle Mass Profiler & Counter” which is a portable, battery-operated laser photometer. The 1-hour TSP meter provides a real time 1-hour TSP measurement based on 90^o light scattering. The 1-hour TSP monitor consists of the following:

(a.) A pump to draw sample aerosol through the optic chamber where TSP is measured;

(b.) A sheath air system to isolate the aerosol in the chamber to keep the optics clean for maximum reliability; and

(c.) A built-in data logger compatible with Windows based program to facilitate data collection, analysis and reporting.

24-hour TSP

3.6.2 The equipment used for 24-hour TSP measurement is TISCH, Model TE-5170 TSP High Volume Air Sampler, which complied with EPA Code of Federal Regulation, Appendix B to Part 50. The High Volume Air Sampler (HVS) consists of the following:

(a.) An anodized aluminum shelter;

(b.) A 8”x10” stainless steel filter holder;

(c.) A blower motor assembly;

(d.) A continuous flow/pressure recorder;

(e.) A motor speed-voltage control/elapsed time indicator;

(f.) A 7-day mechanical timer, and

(g.) A power supply of 220v/50 Hz

3.6.3 For HVS for 24-hour TSP monitoring, the HVS is mounted in a metallic cage with a top for protection and also it is sat on the existing ground or the roof of building. The flow rate of the HVS between 0.6m³/min and 1.7m³/min will be properly set in accordance with the manufacturer’s instruction to within the range recommended in EPA Code of Federal Regulation, Appendix B to Part 50. Glass Fiber Filter 8" x 10" of TE-653 will be used for 24-Hour TSP monitoring and would be supplied by laboratory. The general procedures of sampling are described as below:-

Ÿ A horizontal platform with appropriate support to secure the samples against gusty wind should be provided;

Ÿ No two samplers should be placed less than 2 meters apart;

Ÿ The distance between the sampler and an obstacle, such as building, must be at least twice the height that the obstacle protrudes above the sample;

Ÿ A minimum of 2 meters of separation from any supporting structure, measured horizontally is required;

Ÿ Before placing any filter media at the HVS, the power supply will be checked to ensure the sampler work properly;

Ÿ The filter paper will be set to align on the screen of HVS to ensure that the gasket formed an air tight seal on the outer edges of the filter. Then filter holder frame will be tightened to the filter hold with swing bolts. The holding pressure should be sufficient to avoid air leakage at the edge.

Ÿ The mechanical timer will be set for a sampling period of 24 hours (00:00 mid-night to 00:00 mid-night next day). Information will be recorded on the field data sheet, which would be included the sampling data, starting time, the weather condition at current and the filter paper ID with the initial weight;

Ÿ After sampling, the filter paper will be collected and transfer from the filter holder of the HVS to a sealed envelope and sent to a local HOKLAS accredited laboratory for quantifying.

3.6.4 All the sampled 24-hour TSP filters will be kept in normal air conditioned room conditions, i.e. 70% HR (Relative Humidity) and 25^oC, for six months prior to disposal.

3.6.5 The HVS used for 24-hour TSP monitoring will be calibrated in two months interval for in accordance with the manufacturer’s instruction using the NIST-certified standard calibrator (Tisch Calibration Kit Model TE-5025A) to establish a relationship between the follow recorder meter reading in cfm (cubic feet per minute) and the standard flow rate, Qstd, in m³/min. Motor brushes of HVS will be regularly replaced. The calibration certificates of the air quality monitoring equipment used for the impact monitoring and the HOKLAS accredited certificate of laboratory was provided in Appendix G.

Noise Monitoring

3.6.6 As referred to in the Technical Memorandum (TM) issued under the NCO, sound level meters in compliance with the International Electrotechnical Commission Publications 651:1979 (Type 1) and 804:1985 (Type 1) specifications shall be used for carrying out the noise monitoring. Immediately prior to and following each noise measurement the accuracy of the sound level meter shall be checked using an acoustic calibrator generating a known sound pressure level at a known frequency. Measurements may be accepted as valid only if the calibration levels from before and after the noise measurement agree to within 1.0 dB.

3.6.7 All noise measurements will be performed with the meter set to FAST response and on the A-weighted equivalent continuous sound pressure level (Leq). Leq₍_{30 min)} in six consecutive Leq_{(5 min)} measurements will be used as the monitoring parameter for the time period between 07:00-19:00 hours on weekdays throughout the construction period.

3.6.8 The sound level meter will be mounted on a tripod at a height of 1.2 m and placed at the assessment point and oriented such that the microphone is pointed to the site with the microphone facing perpendicular to the line of sight. The windshield will be fitted for all measurements. Where a measurement is to be carried out at a building, the assessment point would normally be at a position 1 m from the exterior of the building façade. Where a measurement is to be made for noise being received at a place other than a building, the assessment point would be at a position 1.2 m above the ground in a free-field situation, i.e. at least 3.5 m away from reflective surfaces such as adjacent buildings or walls.

3.6.9 Immediately prior to and following each noise measurement the accuracy of the sound level meter will be checked using an acoustic calibrator generating a known sound pressure level at a known frequency. Measurements will be accepted as valid only if the calibration level from before and after the noise measurement agrees to within 1.0 dB.

3.6.10 Noise measurements will not be made in fog, rain, wind with a steady speed exceeding 5m/s or wind with gusts exceeding 10m/s. The wind speed will be checked with a portable wind speed meter capable of measuring the wind speed in m/s.

3.6.11 The sound level meter and calibrator are calibrated and certified by a laboratory accredited under HOKLAS or any other international accreditation scheme at yearly basis. The calibration certificates of noise monitoring equipment used for the impact monitoring was provided in Appendix G.

Marine Water Quality

3.6.12 Marine water quality monitoring would be conducted at all designated locations in accordance with Table 7.1 of the approved EM&A Manual. The procedures of water sampling, in-situ measurement and chemical analysis are described as below:

Ÿ A Global Positioning System (GPS) will be used to ensure that the correct location was selected prior to sample collection. A portable, battery-operated echo sounder was used for the determination of water depth at each designated monitoring station.

Ÿ The marine water sampler will be lowered into the water body at a predetermined depth. The trigger system of the sampler is activated with a messenger and opening ends of the sampler are closed accordingly then the sample of water is collected.

Ÿ During the sampling, the sampling container will be rinsed to use a portion of the marine water sample before the water sample is transferred to the container. Upon sampling completion, the container will be sealed with a screw cap.

Ÿ Before the sampling process, general information such as the date and time of sampling, weather condition and tidal condition as well as the personnel responsible for the monitoring will be recorded on the monitoring field data sheet.

Ÿ In-situ measurement including water temperature, turbidity, dissolved oxygen, salinity, pH and water depth will be recorded at the identified monitoring station and depth. At each station, marine water samples will be collected at three depths: 1m below water surface, 1m above sea bottom and at mid-depth when the water depth exceeds 6m. Samples at 1m below water surface and 1m above sea bottom will be collected when the water depth is between 3m and 6m. And sample at mid-depth will be taken when the water depth is below 3m.

Ÿ For the in-situ measurement, two consecutive measurements of sampling depth, temperature, dissolved oxygen, salinity, turbidity and pH concentration will be measured at the sea. The YSI ProDSS Multifunctional Meter will be retrieved out of the water after the first measurement and then re-deployed for the second measurement. Where the difference in the value between the first and second readings of each set is more than 25% of the value of the first reading, the reading is discarded and further readings is taken.

Ÿ Marine water sample will be collected by using a water sampler. The high-density polythene bottles will be filled after the water sample collected from the sea. Before the water sample being fills into the sampling bottles, the sampling bottles will be pre-rinsed with the same water sample. The sampling bottles will then be packed in cool-boxes (cooled at 4^OC without being frozen), and delivered to HOKLAS accredited laboratory for the chemical analysis as followed APHA Standard Methods for the Examination of Water and Wastewater 19ed 2540D, unless otherwise specified.

3.6.13 Before each round of monitoring, the dissolved oxygen probe will be calibrated by wet bulb method; a zero check in distilled water will be performed with the turbidity and salinity probes. The turbidity probe also will be checked with a standard solution of known NTU and known value of the pH standard solution were used to check the accuracy of pH value before each monitoring day. Moreover, all in-situ measurement equipment used marine water monitoring will be calibrated at three months interval.

Laboratory Analysis

3.6.14 All water samples included the duplicate samples, was tested with chemical analysis as specified in the EM&A Manual by a HOKALS accredited laboratory - ALS Technichem (HK) Pty Ltd. The chemicals analysis method and reporting limit show Table 3-9.

Table 3-9 Testing Method and Reporting Limit of the Chemical Analysis

Parameter	ALS Method Code	In-house Method Reference ⁽¹⁾	Reporting Limit
Total Suspended Solids	EA025	APHA 2540D	1 mg/L

Note:

1. The exact method shall depend on the laboratory accredited method. APHA = Standard Methods for the Examination of Water and Wastewater by the American Public Health Association.

3.6.15 The determination works will start within 24 hours after collection of the water samples or within the holding time as advised by the laboratory.

Meteorological Information

3.6.16 The meteorological information including wind direction, wind speed, humidity and temperature etc. of impact monitoring is extracted from the closest Tseung Kwan O Hong Kong Observatory Station. Moreover, the data of rainfall and air pressure would be extracted from King’s Park Station.

3.6.17 For marine water quality monitoring, tidal information would be referred to tide gauge at Tai Miu Wan.

3.7 Determination of Action/Limit (A/L) Levels

3.7.1 The baseline results form the basis for determining the environmental acceptance criteria for the impact monitoring. A summary of the Action/Limit (A/L) Levels for air quality, construction noise and water quality are shown in Tables 3-10, 3-11 and 3-12 respectively.

Table 3-10 Action & Limit Levels of Air Quality (1-Hour & 24-Hr TSP)

Monitoring Station	Action Level (mg /m³)		Limit Level (mg/m³)
Monitoring Station	1-Hour TSP	24-Hr TSP	1-Hour TSP	24-Hr TSP
AM2	278	NA	500	NA
AM2b	NA	190	NA	260
AM3	278	NA	500	NA
AM4	278	NA	500	NA
AM5	NA	190	NA	260
Note: 1-Hour & 24-Hr TSP of Action Level = (Average Baseline Results × 1.3 + Limit level)/2

Table 3-11 Action and Limit Levels for Construction Noise, dB (A)

Monitoring Location	Action Level	Limit Level
CNMS-1 CNMS-2 CNMS-3 CNMS-5	Time Period: 0700-1900 hours on normal weekdays (Leq30min)
	When one or more documented complaints are received	75 dB(A)
	Time Period: 1900-2300 hours on all days (Leq15min)
	When one or more documented complaints are received	55 dB(A)
Remarks: 1. Construction noise monitoring will be resumed at the designated locations CNMS-2, CNMS-3 and CNMS4 once they are available and permission are granted; 2. The designated locations CNMS-2 and CNMS-3 are located at residential building which are still under construction, Limit Level of 75dB(A) will be adopted until they are occupied; 3. The designated location CNMS-4 is located at planned school and still not yet to construction. When the school occupied and operated, Limit Level of 70dB(A) should be adopted and should be reduced to 65dB(A) during examination period; and 4. If construction works are required during restricted hours, the conditions stipulated in the construction noise permit issued by the Noise Control Authority shall be followed.

Table 3-12 Action and Limit Levels for Water Quality

Monitoring Station	Depth Average of SS (mg/L)
Monitoring Station	Action Level			Limit Level
CC1	7.8	OR 120% of upstream control station at the same tide of the same day (Control Station C3 at Ebb tide and Control Station C4 at Flood tide), whichever is higher		9.3	OR 130% of upstream control station at the same tide of the same day (Control Station C3 at Ebb tide and Control Station C4 at Flood tide) , whichever is higher
CC2	9.0			9.2
CC3	8.2			9.0
CC4	13.8			15.4
CC13	8.9			10.3
SWI1	8 mg/L			10 mg/L

Monitoring Location	Dissolved Oxygen (mg/L)
	Depth Average of Surface and Mid-depth			Bottom
	Action Level		Limit Level	Action Level		Limit Level
CC1	5.8		5.7	5.3		5.2
CC2	5.8		5.7	5.3		5.1
CC3	5.5		5.4	4.9		4.7
CC4	5.7		5.7	5.5		5.4
CC13	5.6		5.5	5.3		5.2
SWI1	5.4		4.8	5.1		5.0

Monitoring Location	Depth Average of Turbidity (NTU)
Monitoring Location	Action Level			Limit Level
CC1	5.8	OR 120% of upstream control station at the same tide of the same day (Control Station C3 at Ebb tide and Control Station C4 at Flood tide) , whichever is higher		6.0	OR 130% of upstream control station at the same tide of the same day (Control Station C3 at Ebb tide and Control Station C4 at Flood tide) , whichever is higher
CC2	4.6			5.5
CC3	4.8			5.4
CC4	6.1			7.1
CC13	6.0			6.3
SWI1	6.1			7.1

3.7.2 Should non-compliance of the environmental quality criteria occurs, remedial actions will be triggered according to the Event and Action Plan which presented in Appendix D.

3.8 Data Management and Data QA/QC Control

3.8.1 All monitoring data will be handled by the ET’s in-house data recording and management system. The monitoring data recorded in the equipment will be downloaded directly from the equipment at the end of each monitoring day. The downloaded monitoring data will input into a computerized database properly maintained by the ET. The laboratory results will be input directly into the computerized database and checked by personnel other than those who input the data.

3.8.2 For monitoring parameters that require laboratory analysis, the local laboratory shall follow the QA/QC requirements as set out under the HOKLAS scheme for the relevant laboratory tests.

4 Air Quality Monitoring

4.1 General

4.1.1 Total Suspended Particulate (TSP) levels monitoring and audit should be performed by the ET to ensure any deteriorating air quality could be readily detected and timely actions taken to rectify the situation. 1-hour TSP or 24-hour TSP should be measured to show the impacts of construction dust on air quality.

4.2 Results Of Air Quality Monitoring

4.2.1 Throughout the Construction Period, a total of 2265 sessions of 1-hour TSP and 657 sessions of 24-hour TSP air quality monitoring were carried out at designated monitoring locations. The monitoring results are summarized in Tables 4-1 to 4-2, and the relevant graphical plots are shown in Appendix E. Breaches of air quality A/L levels and statistical analysis of compliance for air quality monitoring results are summarized in Table 4-3. Meteorological data during the Construction Period are shown in Appendix G.

Table 4-1 Summary of 1-hour TSP Monitoring results

Monitoring Location	ASR ID in EIA	Predicted Maximum Mitigated 1-hour TSP Concentration in EIA (μg/m³)	1-hour TSP Concentration (μg/m³) Average (range)	Monitoring Period	Number of Sessions
AM2	A13	475	69 (19 – 137)	4 Feb 2021 to 28 Apr 2025	819
AM3	A16	412	51 (10 – 126)	8 Apr 2024 to 28 Apr 2025	204
AM4	A1	255	69 (18 – 124)	4 Dec 2018 to 28 Apr 2025	1242

Table 4-2 Summary of 24-hour TSP Monitoring results

Monitoring Location

ASR ID in EIA

Predicted Maximum Mitigated 24-hour TSP Concentration in EIA (μg/m³)

24-hour TSP Concentration (μg/m³)

Average (range)

Monitoring Period

Number of Sessions

AM2⁽¹⁾

A13

124

(13 – 186)

13 Jul 2021 to 29 Apr 2025

243

AM5⁽²⁾

(13 – 188)

3 Dec 2018 to 29 Apr 2025

414

⁽¹⁾AM2 includes the data of both alternative location AM2a and relocated AM2b

⁽²⁾Since there is no ASR in EIA for the alternative location AM5, the predicted maximum mitigated 24-hour TSP concentration of ASR A1 which is the closest ASR is referenced for comparison.

Table 4-3 Summary of Breaches of Air Quality A/L Levels

Monitoring Parameters	Action Level	Limit Level	Status
1-hour TSP	0	0	No NOE of Air quality exceedance was issued
24-hour TSP	0	0	No NOE of Air quality exceedance was issued

4.3 Conclusion and Recommendations

Conclusions

4.3.1 According to the EIA, with implementation of the recommended mitigation measures as well as the relevant control requirements as stipulated in the Air Pollution Control (Construction Dust) Regulation, no adverse residual impacts are predicted at all the ASRs during the construction phase.

4.3.2 The weather throughout the Construction Period was typical Hong Kong climate including rainy season (Apr to Oct) and dry season (Nov to Mar next year). The major dust sources in the Construction Period are construction activities by the Project, as well as traffic emission from Wan Po Road and Wan O Road.

4.3.3 According to the monitoring results, it was concluded that all the 1-hour TSP and 24-hour TSP monitoring results at the designated monitoring location throughout the Construction Period were below the Action/Limit Levels. No exceedances were recorded during the monitoring. Neither NOE nor the associated remedial actions were required for air quality during the Construction Period. Under the construction dust suppression measures as provided by the Contractor, the impact monitoring results were generally fulfilled of the environmental quality criteria of the parameter and comparable to EIA.

4.3.4 The predicted TSP concentration level with provided mitigation measures during the construction phase at the designated monitoring locations based on Section 5.5.6 and Table 5.9 of the EIA report are shown in Table 4-1 and 4-2 respectively. Based on the monitoring results, it is shown that the average 1-hour and 24-hour TSP concentrations recorded at the monitoring locations are below the predicted TSP concentration in EIA. Other factor such as adverse weather conditions and influence of continental airstream with severe air pollution would affect the measured TSP concentration and cause high fluctuation during the Construction Period.

4.3.5 The air quality monitoring performed during the Construction Period are effective for generating data with the necessary statistical power to categorically identify or confirm the presence or absence of the predicted environmental impacts attributable to the works under the Project. The construction dust suppression measures as recommended in the Implementation Schedule for Environmental Mitigation Measures (ISEMM) is also proven effective and adequate.

Recommendations

4.3.6 The air quality mitigation measures stipulated in ISEMM should be strictly observed throughout the construction period in future of others construction projects.

5 Construction Noise Monitoring

5.1 General

5.1.1 The construction noise level in terms of A-weighed equivalent continuous sound pressure level (Leq) measured at all designated monitoring locations should be carried out to ensure that any deteriorating construction noise could be readily detected and timely action taken to rectify the situation throughout the Construction Period.

5.2 Results of Noise Monitoring

5.2.1 Throughout the Construction Period, a total of 902 sessions of daytime noise monitoring were conducted at designated monitoring locations: CNMS-1, CNMS-2, CNMS-3, and interim alternative monitoring location CNMS-5 respectively. During the Construction Period, noise monitoring were not performed under fog, rain, wind with a steady speed exceeding 5 m/s or wind with gusts exceeding 10 m/s of weather condition.

5.2.2 A total of 118 additional evening time noise monitoring and 12 additional night time noise monitoring were also performed at monitoring locations CNMS-1, CNMS-2, and CNMS-5 during the Construction Period. The noise monitoring results throughout the Construction Period are summarized in Table 5-1 to Table 5-3, and the relevant graphical plots are shown in Appendix E

Table 5-1 Summary of Daytime Construction Noise Monitoring Results

Monitoring Location	NSR ID in EIA	Predicted Mitigated Noise Level dB(A) in EIA	Leq, 30min (dB(A)) (Range)	Monitoring Period	Number of Sessions
CNMS-1	R12	73	51.7 – 74.2	8 Nov 2019 to 28 Apr 2025	288
CNMS-2	R14	74	49.2 – 74.6	4 Feb 2021 to 28 Apr 2025	222
CNMS-3	R27	73	53.2 – 67.7	8 Apr 2024 to 28 Apr 2025	56
CNMS-5	R2	63	54.3 – 72.6	4 Dec 2018 to 28 Apr 2025	336

Table 5-2 Summary of Additional Evening Time Construction Noise Monitoring Results

Monitoring Location	Leq, 5min (dB(A)) (Range)	Monitoring Period	Number of Sessions
CNMS-1	49.7 – 61.2	14 Nov 2019 to 30 Dec 2021	41
CNMS-2	44.6 – 52.5	18 Jun 2021 to 30 Dec 2021	4
CNMS-5	58.5 – 64.0	15 Mar 2019 to 30 Dec 2021	73

Table 5-3 Summary of Additional Night Time Construction Noise Monitoring Results

Monitoring Location	Leq, 5min (dB(A)) (Range)	Monitoring Period	Number of Sessions
CNMS-1	49.6 – 54.3	18 Jun 2021 to 14 Dec 2021	4
CNMS-2	47.9 – 51.4	18 Jun 2021 to 14 Dec 2021	4
CNMS-5	55.9 – 57.1	18 Jun 2021 to 14 Dec 2021	4

5.2.3 Throughout the Construction Period, a total of 38 noise complaints were received (which trigger an Action Level), and 110 Limit Level exceedance were recorded. NOEs were issued to relevant parties upon confirmation of the monitoring result. Investigation had been conducted by ET and the investigation results were shown in corresponding Monthly EM&A Reports. Breaches of construction noise A/L levels and statistical analysis of compliance for construction noise monitoring results are summarized in Table 5-4.

Table 5-4 Summary of Breaches of Construction Noise A/L Levels

Monitoring Parameters	Action Level	Limit Level	Project related exceedance	Status
Leq (30min) Daytime	31	0	15	Investigation for all the exceedances and noise complaints and had been conducted according to the Event and Action Plan in the EM&A Manual and presented in the relevant monthly EM&A reports. All the environmental complaint received during construction phase has been resolved.
Leq (5min) Evening Time	1	95	0
Leq (5min) Night Time	6	15	0

5.2.4 According to the EIA, the noise impact associated with unmitigated construction activities for the proposed Project works would cause exceedance of the daytime construction noise criterion at the nearby NSRs during the normal working hours. Therefore, good site practices and mitigation measures including the use of quiet plant and working methods and erection of movable noise barriers to alleviate the noise impact. With the good site practices and mitigation measures in place, no residual impacts are predicted at all the NSRs.

5.2.5 According to the EIA report Section 6.6.5 and Table 6.9, the predicted construction noise level with provided mitigation measures during the construction phase at four residential monitoring locations are 67 dB(A), 74 dB(A), 73 dB(A), and 63 dB(A) respectively. In comparison with the EIA prediction of construction noise level, the range of the measured impact noise levels throughout the construction phase at monitoring stations CNMS-1, CNMS-2, and CNMS-3 were below the predicted level. However, results showed that CNMS-5 has a higher range of measured noise levels (54.3 – 72.6 dB (A)) compared to the predicted level, which might be due to external noise sources such as traffic noises during the monitoring sessions.

5.2.6 In accordance with the investigation results, 15 out of 38 Action Level exceedances were considered project-related. Upon receipt of the complaint, the Contractor took immediate action to implement appropriate noise mitigation measures to further reducing the noise impact. A joint site inspection was also carried out to verify the implementation of the associated mitigation measures, and these were considered effective. With regard to the evening and night-time action level exceedances, the investigation results demonstrated that these were not related to the project. Nevertheless, the Contractor was reminded to strictly implement the noise mitigation measures as far as practicable to reduce to noise impact to the public.

5.2.7 Regarding the Limit Level exceedances of the monitoring, no Limit Level exceedance was recorded in daytime construction noise monitoring. However, a total of 110 Limit Level exceedances were recorded and evening and night-time construction noise monitoring. According to the investigation results, the exceedances recorded were considered as project unrelated. Based on the graphical plot of the monitoring result, there are trends of narrow down of monitoring exceedances due to construction activities and the return of ambient environmental conditions in comparison with the baseline data.

5.2.8 It is considered that the construction noise monitoring performed during the Construction Period are effective for generating data with the necessary statistical power to categorically identify or confirm the presence or absence of the predicted environmental impacts attributable to the works under the Project.

5.2.9 L_eq_(30min) monitoring results registered consistent compliance of the parameter with environmental quality criteria throughout the Construction Period, indicating that the prediction of EIA prediction on the adverse noise nuisance to be generated from the construction of the Project is in general acceptable and the recommended environmental mitigation measures as stipulated in ISEMM are also adequate.

Recommendations

5.2.10 The construction noise mitigation measures stipulated in ISEMM shall be strictly observed throughout the construction period in future of others construction projects.

6 Water Quality Monitoring

6.1 General

6.1.1 The EIA Report has assessed the water quality impacts associated with the Project. According to the EIA Report, the water quality impact could be minimized with the implementation of mitigation measures. The water quality monitoring shall be necessary to undertake during the construction phase. Moreover, regular site inspections and audits undertaken to ensure that runoff/wastewater control and the recommended mitigation measures were properly implemented.

6.1.2 According to the approved EM&A Manual Section 7.6.1, the impact marine water quality monitoring work shall be carried out during the CBL piling and pile excavation works (marine construction activity) of the Project. Impact marine water quality monitoring was commenced in December 2018 when CBL piling and pile excavation works started.

6.2 Results of water monitoring

6.2.1 According to Table 7.1 of the approved EM&A Manual Section 7.4, two Control Stations (C3 & C4), six (6) sensitive receivers (CC1, CC2, CC3, CC4, CC13 & SWI1) and one (1) Gradient station (I1) are recommended to perform water quality monitoring.

6.2.2 A total of 216 sampling days were performed for marine water monitoring at nine designated locations. Monitoring results of 3 key parameters: Dissolved oxygen (DO), turbidity, and suspended solids are summarized in Tables 6-1 to 6-2:

Table 6-1 Summary of Dissolved Oxygen, Turbidity and Suspended Solids of the Water Quality Monitoring Results at Mid-Ebb Tide in the Construction Period

Station ID	Dissolved Oxygen average (mg/L) (range)	Turbidity (NTU) average (range)	Suspended solid (mg/L) average (range)	Monitoring Period
Surface & Mid Layer	Bottom Layer
CC1	7.04 (5.07 – 10.18)	6.72 (4.44 –9.26)	1.37 (0.06 – 3.86)	3.50 (1.00 – 10.43)	3 Dec 2018 to 29 Apr 2020
CC2	6.99 (5.18 – 9.40)	6.6 (4.47 – 8.73)	1.63 (0.32 – 4.40)	3.58 (1.00 – 9.10)	3 Dec 2018 to 29 Apr 2020
CC3	6.97 (5.37 – 11.34)	6.47 (4.57 – 8.36)	1.73 (0.41 – 4.42)	3.66 (1.00 – 12.07)	3 Dec 2018 to 29 Apr 2020
CC4	6.94 (5.29 – 9.61)	NA	1.53 (0.17 – 4.69)	3.89 (1.00 – 18.05)	3 Dec 2018 to 29 Apr 2020
CC13	7 (5.21 – 9.94)	6.69 (4.47 – 9.33)	1.39 (0.15 – 4.18)	3.71 (1.00 – 12.25)	3 Dec 2018 to 29 Apr 2020
SWI1	6.99 (5.37 – 10.44)	6.86 (4.86 – 9.53)	1.40 (0.16 – 4.79)	3.86 (1.00 – 15.43)	3 Dec 2018 to 29 Apr 2020
C3	6.88 (4.62 – 9.13)	6.59 (4.34 – 8.64)	1.68 (0.11 – 4.05)	3.78 (1.00 – 10.92)	3 Dec 2018 to 29 Apr 2020
C4	6.89 (4.77 – 9.00)	6.63 (4.33 – 8.83)	1.61 (0.20 – 5.07)	3.55 (1.00 – 11.03)	3 Dec 2018 to 29 Apr 2020

Station

Dissolved Oxygen average (mg/L)

(range)

Turbidity (NTU) average

(range)

Suspended solid (mg/L) average (range)

Monitoring Period

Surface & Mid Layer

Bottom Layer

CC1

7.04

(5.07 – 10.18)

6.72

(4.44 –9.26)

1.37

(0.06 – 3.86)

3.50

(1.00 – 10.43)

3 Dec 2018 to 29 Apr 2020

CC2

6.99

(5.18 – 9.40)

6.6

(4.47 – 8.73)

1.63

(0.32 – 4.40)

3.58

(1.00 – 9.10)

3 Dec 2018 to 29 Apr 2020

CC3

6.97

(5.37 – 11.34)

6.47

(4.57 – 8.36)

1.73

(0.41 – 4.42)

3.66

(1.00 – 12.07)

3 Dec 2018 to 29 Apr 2020

CC4

6.94

(5.29 – 9.61)

1.53

(0.17 – 4.69)

3.89

(1.00 – 18.05)

3 Dec 2018 to 29 Apr 2020

CC13

(5.21 – 9.94)

6.69

(4.47 – 9.33)

1.39

(0.15 – 4.18)

3.71

(1.00 – 12.25)

3 Dec 2018 to 29 Apr 2020

SWI1

6.99

(5.37 – 10.44)

6.86

(4.86 – 9.53)

1.40

(0.16 – 4.79)

3.86

(1.00 – 15.43)

3 Dec 2018 to 29 Apr 2020

6.88

(4.62 – 9.13)

6.59

(4.34 – 8.64)

1.68

(0.11 – 4.05)

3.78

(1.00 – 10.92)

3 Dec 2018 to 29 Apr 2020

6.89

(4.77 – 9.00)

6.63

(4.33 – 8.83)

1.61

(0.20 – 5.07)

3.55

(1.00 – 11.03)

3 Dec 2018 to 29 Apr 2020

Remark: No Dissolved Oxygen (Bottom) monitoring data available for CC4 due to the water depth measured at CC4 during the monitoring days were less than 3 meters.

Table 6-2 Summary of Dissolved Oxygen, Turbidity and Suspended Solids of the Water Quality Monitoring Results at Mid-Flood Tide in the Construction Period

Station ID	Dissolved Oxygen average (mg/L) (range)	Turbidity (NTU) average (range)	Suspended solid (mg/L) average (range)	Monitoring Period
Surface & Mid Layer	Bottom Layer
CC1	7.04 (5.42 – 9.47)	6.71 (4.76 – 9.36)	1.42 (0.07 – 4.00)	3.59 (1.00 – 10.55)	3 Dec 2018 to 29 Apr 2020
CC2	6.98 (5.13 – 9.26)	6.60 (4.49 – 8.58)	1.61 (0.26 – 4.59)	3.64 (1.00 – 11.88)	3 Dec 2018 to 29 Apr 2020
CC3	6.95 (5.35 – 9.61)	6.45 (4.64 – 9.03)	1.72 (0.31 – 4.30)	3.54 (1.00 – 13.77)	3 Dec 2018 to 29 Apr 2020
CC4	6.95 (5.30 – 9.59)	NA	1.59 (0.04 – 6.06)	3.88 (1.00 – 14.15)	3 Dec 2018 to 29 Apr 2020
CC13	7.00 (5.49 – 10.31)	6.69 (4.81 – 9.11)	1.47 (0.36 – 5.25)	3.89 (1.00 – 15.42)	3 Dec 2018 to 29 Apr 2020
SWI1	7.04 (5.44 –10.60)	6.85 (4.84 – 10.10)	1.40 (0.14 – 5.20)	3.85 (1.00 – 14.58)	3 Dec 2018 to 29 Apr 2020
C3	6.91 (5.01 – 9.59)	6.59 (4.43 – 8.57)	1.66 (0.25 – 5.73)	3.61 (1.00 – 10.42)	3 Dec 2018 to 29 Apr 2020
C4	6.92 (5.18 – 9.42)	6.63 (4.30 – 8.75)	1.65 (0.35 – 3.80)	3.63 (1.00 – 10.60)	3 Dec 2018 to 29 Apr 2020

Station

Dissolved Oxygen average (mg/L)

(range)

Turbidity (NTU) average

(range)

Suspended solid (mg/L) average (range)

Monitoring Period

Surface & Mid Layer

Bottom Layer

CC1

7.04

(5.42 – 9.47)

6.71

(4.76 – 9.36)

1.42

(0.07 – 4.00)

3.59

(1.00 – 10.55)

3 Dec 2018 to 29 Apr 2020

CC2

6.98

(5.13 – 9.26)

6.60

(4.49 – 8.58)

1.61

(0.26 – 4.59)

3.64

(1.00 – 11.88)

3 Dec 2018 to 29 Apr 2020

CC3

6.95

(5.35 – 9.61)

6.45

(4.64 – 9.03)

1.72

(0.31 – 4.30)

3.54

(1.00 – 13.77)

3 Dec 2018 to 29 Apr 2020

CC4

6.95

(5.30 – 9.59)

1.59

(0.04 – 6.06)

3.88

(1.00 – 14.15)

3 Dec 2018 to 29 Apr 2020

CC13

7.00

(5.49 – 10.31)

6.69

(4.81 – 9.11)

1.47

(0.36 – 5.25)

3.89

(1.00 – 15.42)

3 Dec 2018 to 29 Apr 2020

SWI1

7.04

(5.44 –10.60)

6.85

(4.84 – 10.10)

1.40

(0.14 – 5.20)

3.85

(1.00 – 14.58)

3 Dec 2018 to 29 Apr 2020

6.91

(5.01 – 9.59)

6.59

(4.43 – 8.57)

1.66

(0.25 – 5.73)

3.61

(1.00 – 10.42)

3 Dec 2018 to 29 Apr 2020

6.92

(5.18 – 9.42)

6.63

(4.30 – 8.75)

1.65

(0.35 – 3.80)

3.63

(1.00 – 10.60)

3 Dec 2018 to 29 Apr 2020

Remark: No Dissolved Oxygen (Bottom) monitoring data available for CC4 due to the water depth measured at CC4 during the monitoring days were less than 3 meters.

6.2.3 Throughout the Construction Period, a total of 22 Action Level and 33 Limit Level exceedances were recorded. NOEs were issued to relevant parties upon confirmation of the monitoring result. Investigation had been conducted by ET and the investigation result shown in corresponding Monthly EM&A Reports. Breaches of water quality A/L levels and statistical analysis of compliance for water quality results are summarized in Table 6-3.

Table 6-3 Summary of Breaches of Water Quality A/L Levels

Monitoring Parameters	Action Level	Limit Level	Project related exceedance	Status
DO	3	17	0	Investigation for all the exceedances had been conducted according to the Event and Action Plan in the EM&A Manual and presented in the relevant monthly EM&A reports.
Turbidity	0	0	0
SS	19	16	0

6.2.4 Investigation for all the exceedances had been conducted in accordance with the Event and Action Plan in the EM&A Manual. According to the investigation findings, the exceedances were concluded as project unrelated as the water quality mitigation measures were properly implemented without any abnormal and turbid discharge. Other factors such as seasonal changes, rainfall and tidal conditions may contribute to the exceedances resulted in the monitoring. Both the findings and the conclusion has presented in the relevant monthly EM&A report. Although the exceedances recorded are concluded as project unrelated, both Contractors are reminded to pay special attention on water quality mitigation measures and should fully implement the measures recommended in the EM&A Manual, in particular to prevent construction site runoff and other pollutants from flowing to local sewage system and coral sites. .

6.2.5 All the environmental complaint due to water quality issues as received during construction phase has resolved.

6.3 Conclusions and Recommendations

Conclusions

6.3.1 The graphical plot of DO, Turbidity and SS monitoring result shown that ambient environmental conditions in comparison with baseline data has been slowly resume due to construction activities narrow down.

6.3.2 Throughout the construction period, water quality monitoring recorded that most parameters consistently met environmental quality standards. This indicates that the projection of the impact of the EIA on the construction of the project is acceptable. Also, the recommended environmental mitigation measures prescribed by the ISEMM are also adequate.

Recommendations

6.3.3 The water quality mitigation measures stipulated in ISEMM shall be strictly observed throughout the construction period in future of others construction projects which near with watercourse

7 Waste Management

7.1 General Waste Management

7.1.1 Waste management would be carried out by an on-site Environmental Officer or an Environmental Supervisor from time to time.

7.2 Records of Waste Quantities

7.2.1 All types of waste arising from the construction work are classified into the following:

l Construction & Demolition (C&D) Material;

l Chemical Waste; and

l General Refuse

7.2.2 The quantities of waste for disposal in the Construction Period by mean of Waste Flow Table are presented in Appendix F. The Contractor was reminded that, whenever possible, materials were reused on-site as far as practicable. Summary of total waste generated from construction phase of the Project is shown in Table 7-1 and Table 7-2.

Table 7-1 Summary of Quantities of Inert C&D Materials

Type of Waste	Quantity		Total (‘000 m³)	Disposal Location
Type of Waste	Contract 1	Contract 2	Total (‘000 m³)	Disposal Location
C&D Materials (Inert) (‘000 m³)	17.886	69.964	87.85	-
Reused in this Contract (Inert) (‘000m³)	0	0.358	0.358	-
Reused in other Projects (Inert) (‘000m³)	0	0	0	-
Disposal as Public Fill (Inert) (‘000m³)	18.162	68.707	86.869	TKO-137
Imported Fill (Inert) (‘000 m³)	0.626	13.111	13.737	-

Table 7-2 Summary of Quantities of C&D Wastes

Type of Waste	Quantity		Total	Disposal Location
Type of Waste	Contract 1	Contract 2	Total	Disposal Location
Recycled Metal (‘000 kg)	0	8.917	8.917	Collected by licensed collector
Recycled Paper / Cardboard Packing (‘000 kg)	9.309	0.995	10.304	Collected by paper recycling company
Recycled Plastic (‘000 kg)	0	0.215	0.215	Collected by licensed collector
Chemical Wastes (‘000 kg)	0.132	0.015	0.147	Collected by licensed collector
General Refuses (‘000 m³)	17.414	8.328	25.742	NENT

7.3 Effectiveness Of Solid and Liquid Waste Management

7.3.1 Waste management was the contractor’s responsibility to ensure that all wastes produced during the construction phase are handled, stored and disposed of in accordance with good waste management practices and EPD’s regulations and requirements. The Waste Management Plan was developed by the Contractor to include the recommended mitigation measures in the construction phase.

7.3.2 During construction phase, regular site inspection as part of the EM&A procedures were carried out to determine if wastes are being managed in accordance with approved procedures and the Waste Management Plan. Different aspects of waste management including waste generation, storage, recycling, treatment, transport and disposal had included in the programme. Waste Flow Table implemented by the Project has properly recorded the total qualities of wastes generated and disposal arrangement, they were general in line with the EIA Report.

7.3.3 With the implementation of the recommended mitigation measures for the handling, transportation and disposal of the identified waste arising, residual impacts are not observed for construction phases. It is deemed that the solid and liquid waste management is effective and under control.

8 Site Inspection

8.1 Requirements

8.1.1 According to the approved EM&A Manual, the environmental site inspection shall be formulation by ET Leader. Weekly environmental site inspections should carry out to confirm the environmental performance.

8.2 Findings / Deficiencies During Construction Period

8.2.1 Throughout the Construction Period, weekly joint site inspection has been carried out by supervisor, Contractors, IEC, and ET to evaluate site environmental performance. No non-compliance was recorded and minor deficiencies were in general rectified within the specified deadlines. The environmental performance of the two Contracts as under the Project was therefore considered satisfactory. The summary of site inspection are shown in Table 8-1.

Table 8-1 Summary of Site Inspection

Date	Number of Sessions	Inspection Period
Contract 1	334	29 August 2018 to 30 April 2025
Contract 2	327	21 November 2018 to 30 April 2025

9 Landfill Gas Monitoring

9.1 General Requirement

9.1.1 Pursuant to Section 13 of the Project’s EM&A Manual, landfill gas monitoring shall perform during excavation work within the 250m Consultation Zone of Tseung Kwan O Stage II & III Landfill. For landfill gas monitoring requirements, pre entry and routine measurement shall be undertaken in accordance with the Factories and Industrial Undertaking (Confined Spaces) Regulation.

9.1.2 According to Environmental Mitigation Implementation Schedule (EMIS) S14.7.6, portable monitoring equipment can be used to conduct landfill gas monitoring. Moreover, the frequency and areas to be monitored should be set down prior to commencement of the works either by the Safety Officer or by an appropriately qualified person.

9.2 Limit Levels and Event and Action Plan

9.2.1 In event of the trigger levels specified in Table 14.6 of the EIA report being exceeded, a person, such as the Safety Officer, shall be nominated, with deputies, to be responsible for dealing with any emergency which may occur due to LFG. In an emergency situation the nominated person, or his deputies, shall have the necessary authority and shall ensure that the confined space is evacuated and the necessary works implemented for reducing the concentrations of gas. The Limit levels and relevant Action Plans for landfill gas detected in utilities and any on-site areas following construction is listed in Table 9-1.

Table 9-1 Actions in the Event of Landfill Gas Being Detected in Excavations

Parameter	Limit Level	Actions
Methane	>10% LEL (i.e. >0.5% by volume)	Ÿ Post “No Smoking” signs Ÿ Prohibit hot works Ÿ Ventilate to restore methane to <10% LEL
Methane	>20% LEL (i.e. >1% by volume)	Ÿ Stop excavation works Ÿ Evacuate personnel/prohibit entry Ÿ Increase ventilation to restore methane to <10% LEL
Carbon dioxide	>0.5%	Ÿ Ventilate to restore carbon dioxide to <0.5%
Carbon dioxide	>1.5%	Ÿ Stop excavation works Ÿ Evacuate personnel/prohibit entry Ÿ Increase ventilation to restore carbon dioxide to <0.5%
Oxygen	<19%	Ventilation to restore oxygen >19%
Oxygen	<18%	Ÿ Stop excavation works Ÿ Evacuate personnel/prohibit entry Ÿ Increase ventilation to restore oxygen to >19%

9.2.2 In the event of the trigger levels specified in Table 9-1 being exceeded, the Safety Officer shall be responsible for dealing with any emergency which may occur due to landfill gas.

9.3 Landfill Gas Monitoring

9.3.1 During the Construction Period, a total of 968 days of landfill gas monitoring was conducted by the Safety Officer or an approved and qualified person at the zone Wan O Road which excavation work of Contract 2 was carried out. The results of landfill gas measurement are summarized in Table 9-2.

Table 9-2 Summary of Landfill Gas Measurement Results

Landfill Gas Parameter	Year	Detectable at LMR		Action Level	Limit Level
Landfill Gas Parameter	Year	Min	Max	Action Level	Limit Level
Methane	2019	0.1%	0.1%	>10% LEL (>0.5% v/v)	>20% LEL (>1% v/v)
	2020	0.1%	0.1%
	2021	0%	0%
	2022	0%	0%
	2023	0%	0%
Oxygen	2019	20.8%	21.1%	<19%	<18%
	2020	20%	22%
	2021	20.6%	20.8%
	2022	20.3%	21.1%
	2023	20.3%	20.7%
Carbon Dioxide	2019	0.1%	0.2%	>0.5%	>1.5%
	2020	0.1%	0.2%
	2021	0%	0%
	2022	0%	0%
	2023	0%	0%

9.3.2 According to the measurement results, it is shown that slightly methane and carbon dioxide concentration was detected at the zone Wan O Road where the excavation work was carried out during the period. Oxygen concentration during the excavation work period was over 19.0%

9.3.3 No exceedance was triggered and therefore no corrective action was required accordingly in the excavation work period. Database of the landfill gas monitoring results can be referred to the corresponding monthly EM&A Reports.

10 Environmental Complaint and Non-Compliance

10.1 Environmental Complaint, Summons and Prosecution

10.1.1 Throughout the Construction Period, a total of 55 environmental complaints were lodged under the EM&A Programme. ET had performed investigations by auditing the mitigation measures implemented by the Contractor. Following the investigations, 16 out of 55 complaints were considered as project related complaint. The Contractors were advised to implement and enhance the relevant mitigation measures. Site check was conducted by ET to check the environmental performance after the situation has been rectified.

10.1.2 Neither environmental summons nor prosecutions were received for the Project throughout the Construction Period. The statistical summary table of environmental complaint is presented in Tables 10-1, 10-2 and 10-3. A summary of complaint log is shown on Appendix I.

Table 10-1 Statistical Summary of Environmental Complaints

Contract No	Contract Period	Environmental Complaint Statistics
Contract No	Contract Period	Cumulative Complaint	Project related complaint
Contract 1	3 Dec 2018 – 30 Apr 2025	33	11
Contract 2	17 Jan 2019 – 30 Apr 2025	26	9

Table 10-2 Statistical Summary of Environmental Summons

Contract No	Contract Period	Environmental Summons Statistics
Contract No	Contract Period	Cumulative Summons	Summons Nature
Contract 1	3 Dec 2018 – 30 Apr 2025	0	NA
Contract 2	17 Jan 2019 – 30 Apr 2025	0	NA

Table 10-3 Statistical Summary of Environmental Prosecution

Contract No	Contract Period	Environmental Prosecutions Statistics
Contract No	Contract Period	Cumulative Prosecutions	Prosecutions
Contract 1	3 Dec 2018 – 30 Apr 2025	0	NA
Contract 2	17 Jan 2019 – 30 Apr 2025	0	NA

11 Implementation Status of Mitigation Measures

11.1 General Requirements

11.1.1 The environmental mitigation measures that recommended in the Implementation Schedule for Environmental Mitigation Measures (ISEMM) in the approved EM&A Manual covered the issues of dust, noise, water and waste and they are summarized presented in Appendix H.

11.1.2 The Contractors had been implementing the required environmental mitigation measures according to the Environmental Monitoring and Audit Manual subject to the site condition. Environmental mitigation measures generally implemented by the Contractors in the Construction Period are summarized in Table 11-1.

Table 11-1 Environmental Mitigation Measures in the Construction Period.

Issues	Environmental Mitigation Measures
Construction Noise	· Regularly to maintain all plants, so only the good condition plants were used on-site ; · If possible, all mobile plants onsite operation has located far from NSRs; · When machines and plants (such as trucks) were not in using, it was switched off; · Wherever possible, plant was prevented oriented directly the nearby NSRs; · Provided quiet powered mechanical equipment to use onsite; · Weekly noise monitoring was conducted to ensure construction noise meet the criteria.
Air Quality	· Stockpile of dusty material was covered entirely with impervious sheeting or sprayed with water so as to maintain the entire surface wet; · The construction plants regularly maintained to avoid the emissions of black smoke; · The construction plants switched off when it not in use; · Water spraying on haul road and dry site area was provided regularly; · Where a vehicle leaving the works site is carrying a load of dusty materials, the load has covered entirely with clean impervious sheeting; and · Before any vehicle leaving the works site, wheel watering has been performed.
Water Quality	· Debris and refuse generated on-site collected daily; · Oils and fuels were stored in designated areas; · The chemical waste storage as sealed area provided; · Site hoarding with sealed foot were provided surrounding the boundary of working site to prevent wastewater or site surface water runoff get into public areas; and · Portable chemical toilets were provided on-site. A licensed contractor was regularly disposal and maintenance of these facilities. · Silt curtain was installed and maintained in accordance with EP condition
Waste and Chemical Management	· Excavated material reused on site as far as possible to minimize off-site disposal. · Scrap metals or abandoned equipment should be recycled if possible; · Waste arising kept to a minimum and be handled, transported and disposed of in a suitable manner; · Disposal of C&D wastes to any designated public filling facility and/or landfill followed a trip ticket system; and · Chemical waste handled in accordance with the Code of Practice on the Packaging, Handling and Storage of Chemical Wastes.
General	Ÿ The site is generally kept tidy and clean. Ÿ Mosquito control is performed to prevent mosquito breeding on site.

11.2 Noise Mitigation Measure during Operation of the Project

11.2.1 According to Environmental Permit EP-459/2013 Condition 3.4, noise mitigation measures such as low noise surfacing and semi-enclosure noise barrier shall be implemented at CBL main bridge and Road D9 to mitigate traffic noise impact arising from the operation of Project. The details of the mitigation measures are shown in Table 11-2. All the locations and dimensions of the required mitigation measures are complied with Table 1 and Figure 2 of the EP.

Table 11-2 Noise Mitigation Measures during Operation of the Project

No.	Required Mitigation Measures	Actual Mitigation Measures Implemented
N1	Approx. 300m long low noise surfacing	400m long low noise surfacing
N2	Approx. 960m long low noise surfacing	1060m long low noise surfacing
N3	Approx. 220m long 6m height + 17m width semi-enclosure	220m long 6.6m height + 17m width semi-enclosure
N4	Approx. 245m long 6m height + 10.5m width semi-enclosure	245m long 6.3m height + 10.7m width semi-enclosure
N5	Approx. 22m long 6m height +13.2m width semi-enclosure	22m long 6.3m height + 13.7m width semi-enclosure
N6	Approx. 33m long 6m height + 17.4m width semi-enclosure	33m long 6.3m height + 17.4m width semi-enclosure
N7	Approx. 90m long 6m height + 13.5m width semi-enclosure	90m long 6.3m height + 13.7m width semi-enclosure
N8	Approx. 55m long low noise surfacing	55m long low noise surfacing

12 Conclusions and Recommendations

12.1 Conclusions

12.1.1 This is the Final EM&A Report for Construction Phase for Contracts 1 and 2, summarizing the monitoring results and inspection findings during the construction period from 3^rdDecember 2018 to 30^th April 2025.

12.1.2 Throughout the Construction Period, 1-hour TSP and 24-hour TSP were conducted based on the EM&A requirement. Both 1-hour TSP and 24-hour TSP monitoring results throughout the Construction Period were below the Action /Limit Levels.

12.1.3 Throughout the Construction Period, a total of 38 Action Level and 110 Limit Level exceedances were recorded at the designated construction noise monitoring stations. NOEs were issued to the corresponding parties upon confirmation of the monitoring result, and subsequent investigations for the causes of exceedances were conducted by the ET. Based on the investigation results, 15 out of 38 Action Level exceedances were considered as project related. Upon receipt of the complaint, the Contractor had taken immediate action to implement relevant noise mitigation measures to further minimize the noise impact. Although there were 110 Limit Level exceedances recorded throughout the construction period, they were considered as project unrelated. However, Contractors were reminded to strictly implement the noise mitigation measures as far as practicable to reduce to noise impact to the public

12.1.4 Throughout the Construction Period, a total of 22 Action Level and 33 Limit Level exceedances were recorded at the water quality monitoring stations for the parameters of Dissolved Oxygen, Turbidity, and Suspended Solids. NOEs were issued to the relevant parties upon confirmation of the monitoring result, and subsequent investigations for the causes of exceedances were conducted by the ET. Although the investigation results of the exceedances are project unrelated, both Contractors are reminded to pay special attention water quality mitigation measures and should fully implement the measures recommended in the EM&A Manual.

12.1.5 Throughout the Construction Period, a total of 968 days of landfill gas monitoring was conducted by the Safety Officer or an approved and qualified person at the zone Wan O Road which excavation work of Contract 2 was carried out. No exceedance was triggered and therefore no corrective action was required accordingly in the excavation period.

12.1.6 Throughout the Construction Period, a total of 334 sessions of site inspections were conducted for Contract 1, and 327 sessions for Contract 2 were conducted by the ET to evaluate the environmental performance of both contracts. No non-compliance was recorded on both contracts, and minor deficiencies were generally rectified within the special deadlines. Therefore, the environmental performance of both contracts under the project was considered satisfactory.

12.1.7 An Independent Environmental Inspector (IEC) joined monthly site inspection with the Representative Engineer (RE), the Contractors and ET. A total of 76 audits were performed for Contract 1 and 74 for Contract 2 throughout the Construction Period. No non-compliance issues were identified; however, minor deficiencies were noted and were generally rectified within the specified deadlines. This collaborative effort contributed to maintaining effective environmental oversight and compliance for both contracts.

12.1.8 Throughout the Construction Period, a total of 55 environmental complaints were lodged under the EM&A Programme. ET had carried out investigations by auditing the mitigation measures implemented by the Contractor. After investigation, 16 out of 55 complaints were considered as project related. The Contractor was strongly advised to implement and enhance the relevant mitigation measures. Site check was conducted by ET to check the environmental performance after the situation has been rectified.

12.1.9 Throughout the Construction Period, no environmental summons or prosecutions were received for the project.

12.1.10 To conclude, monitoring results of air quality, construction noise, and water quality in general indicated satisfactory environmental performance of the Project. The environmental mitigation measures as recommended in the ISEMM are also proven effective and adequate.

12.2 Recommendations

12.2.1 Precision of the prediction of the EIA on the adverse air quality, noise, and water quality impacts as generated from the construction of the Project is acceptable. The monitoring performed during the Construction Period is effective for generating data with the necessary statistical power to categorically identify or confirm the presence and absence of the predicted environmental impacts attributable to the works under the Project.

12.2.2 The mitigation measures stipulated in ISEMM included air quality, noise, and water quality are effective and shall be strictly implemented and observed throughout the construction period in future of other construction projects to ensure ongoing environmental protection and compliance.

²²END²²




			Job No.: TCS00975/18

			CEDD Contract Agreement No. EDO/04/2018 - Environmental Team for Cross Bay Link, Tseung Kwan O

			Final environmental monitoring and audit (EM&A) review report
			Prepared For
			Civil Engineering and Development Department (CEDD)

Version	Date	Remarks
1	27 June 2025	First Submission
2	8 August 2025	Amended as per IEC’s comments