Revision History

Rev.

Description of Modification

Date

 

A

 

First Issue for Comments

 

29/11/2022

 

B

 

Revised according to IEC and SOR comment

 

30/12/2022

 

 

 

 


 

 

CONTENTS

Executive Summary......................................................................................................................... 1

Basic Project Information.......................................................................................................... 6

Noise....................................................................................................................................... 11

Water Quality.......................................................................................................................... 15

Waste...................................................................................................................................... 19

Landfill Gas Monitoring........................................................................................................... 22

Summary of Monitoring Exceedance, Complaints, Notification of Summons and Prosecutions 25

EM&A Site Inspection.............................................................................................................. 28

Conclusions and Recommendations........................................................................................ 29

 

 

Appendix A             Master Programme

 

Appendix B             Overview of Desalination Plant in Tseung Kwan O

 

Appendix C             Summary of Implementation Status of Environmental Mitigation

Appendix D             Water Quality Monitoring Graphical Presentation

Appendix E             Summary of Exceedances

Appendix F             Waste Flow Table

Appendix G             Complaint Log

 

Appendix H            Event/Action Plan for Water Quality Monitoring

Appendix I              Event/Action Plan for Construction Noise Exceedance

 

 

 

 

 

Executive Summary

 

Introduction

 

A1. The Project, Design, Build and Operate First Stage of Tseung Kwan O Desalination Plant (TKODP), is a Designated Project under the Environmental Impact Assessment Ordinance (Cap. 499) (EIAO) and is currently governed by a Further Environmental Permit (EP No. FEP - 01/503/2015/A) for the construction and operation of the Contract.

 

A2. In accordance with the Environmental Monitoring and Audit (EM&A) Manual for the Contract, EM&A works for marine water quality, noise, waste management and ecology should be carried out by Environmental Team (ET), Acuity Sustainability Consulting Limited (ASCL), during the construction phase of the Contract.

 

A3.  This is the 10th Quarterly EM&A Report, prepared by ASCL, for the Contract summarizing the monitoring results and audit findings of the EM&A programme at and around Tseung Kwan O Area 137 (TKO 137) during the reporting period from 1 June to 31 August 2022.

 

A4. The EM&A programme for this contract has covered environmental monitoring on construction noise level at selected NSRs and Contractor’s environmental performance auditing in the aspects of construction dust, construction noise, water quality, waste management, Landscape and Visual and Ecology.

 

Summary of Main Works Undertaken & Key Mitigation Measures Implemented

 

A5.      Key activities carried out in this reporting period for the Project included the followings:

 

ActiDAFF

-       Underground utility (UU) Construction Work

-       Water proofing work on roof of Cartridge Filter Plant Room and Construction of kiosk and installation of louvre

-       Construction of Side Tanks No. 5 8

-       Installation of GRP Casts in Media Chambers co. 9 16

 

CLP 132kV Substation

-       Underground utility (UU) Construction Work

-       Construction of temporary emergency vehicular access (eva)

 

On-Site Chlorine Generation Building (OSCG Bldg)

-       Internal finishing work

-       Water tightness test of water tank & flat roof

 

CO2 Tank Area

-       Internal finishing work


 

Administration Building

-       Construction of parapet and internal finishes at G/F, 1/F and 2/F

-       Installation of hoarding on 2/F

-       Construction of 3/F to 4/F walls and columns

-       Installation of curtain wall supports

 

Inspection corridor

-       Construction of stair tower and Steel fixing works for segment 6 and segment 4

-       Construction of columns and beams of FT-5, FT6, FT7 and FT-8

 

Post Treatment Building (PTB)

-       Construction of Sludge thickener, Post Treatment Building

-       Water tightness test of water tank & flat roof

 

Product Water Storage Tank (PWST)

-       Underground utility (UU) Construction Work

-       Carbon steel pipe installation Work

-       Design for Manufacturing and Assembly (DfMA) installation at PWST South side

-       Water tightness test of water tank & flat roof

 

Chemical Building

-       Underground utility (UU) Construction Work

-       Water proofing work on roof

-       Carrying out of Finishing works in the Plant Room

 

Reverse Osmosis (RO) Building

-       Underground utility (UU) Construction Work

-       Staircases and internal finishing work

-       DfMA installation at RO Building North side

-       Water tightness test of water tank & flat roof

 

Main Electrical and Central Chiller Plant building (MECCP)

-       Installation of louvre, metal doors and timber doors

-       Water tightness test of water tank & flat roof

 

Outfall Shaft

-       Install marine outfall structure, concreting, GRP Pipe installation, Dredging for diffuser

-       Bulkhead installation at Outfall tunnel

 

Intake Shaft

-       Levelling of formation level & install marine intake structure

-       General cleaning for finial inspection and flooded by seawater at Intake tunnel

 

Combined Shaft

-       Permanent structure construction from +4.9mPD to +15.3mPD

 

Pump room

-       Permanent structure Wall construction from +6.8 to 14.3mPD


 

Open Channel

-       Trench excavation and structure installation, grouting and backfill

Slope

-       Excavation at slope toe and access erection, mini piles construction

 

EM&A Works

-       Installation of building services, Lifting of steel tanks at Chemical Building

-       Installation of building services at Administration Building

-       Installation of building services, Lifting of lime silo, filter press and piping at PTB

-       Installation of building services, mechanical equipment, steel pipe at PWST

-       Installation of building services, steel pipe, Glass fiber reinforced plastics pipe pipe and lifting of electrical switchboard at RO Building

-       Installation of chillers, building services and electrical switchboard at MECCP

-       Scaffolding, installation of mechanical equipment and piping at ActiDAFF

 

A6.  The major environmental impacts brought by the above construction works include:

-     Construction dust and noise generation from marine construction works, excavation works, excavation works, construction works, rock cutting works and pipe pilling driving works;

-     Waste generation from the construction activities

-     Impact on water quality from marine construction works and inland construction works

 

A7.      The key environmental mitigation measures implemented for the Project in this reporting period associated with the above construction works include:

-     Dust suppression by regular wetting and water spraying for construction works;

-     Reduction of noise from equipment and machinery on-site and regularly inspection to machinery and plants/vehicles on-site to ensure proper functioning;

-     Sorting and storage of general refuse and construction waste; and

-     Deployment of temporary silt curtain in the area where marine construction works were conducted and deployment of water sedimentation tanks for treatment of wastewater at inland areas before discharge

Summary of Exceedance & Investigation & Follow-up

 

A8.  No noise monitoring was conducted during the reporting period since there are no project- related construction activities undertaken within a radius of 300m from the monitoring locations. No exceedance of the Action Level was recorded during the reporting period.

 

A9. The EM&A works for water quality were conducted during the reporting period in accordance with the EM&A Manual.


 

A10.    Water quality monitoring was conducted as schedule in the reporting period. Forty -four (44) action level exceedances and twenty-five (25) limit level exceedances for suspended solids (SS) of impact water quality monitoring were recorded in the reporting period. All action and limit level exceedances were concluded non-project related.

 

A11. As commented by EPD on the determination of action and limit level exceedance for water quality monitoring, the monitoring result is considered as exceedance if it exceeds either the 95%-ile of baseline data or 20% exceedance of value at any impact station compared with corresponding data from control station.

 

A12. In view of that all water quality monitoring result from March 2021 to August 2022 were reviewed using the above-mentioned determination method to reassess the number of action and limit level exceedances since the commencement of water quality monitoring.

 

A13. Total one thousand one hundred and sixty-nine (1169) action level exceedances and five hundred and sixty-two (562) limit level exceedances for turbidity were recorded during mid flood tide since the commencement of the water quality monitoring and one thousand two hundred and thirty-seven (1237) action level exceedances, and six hundred and five (605) limit level exceedances for turbidity were recorded during mid ebb tide since the commencement of the water quality monitoring. Whenever a data exceedance occurred, remeasurement at the same monitoring location was immediately conducted. Fortunately, no average turbidity data exceedances have ever been identified after such remeasurement.

 

A14. Total six hundred and ninety-seven (697) action level exceedances and five hundred and sixteen (516) limit level exceedances for suspended solids were recorded during mid flood tide since the commencement of the water quality monitoring and eight hundred and sixteen (816) action level exceedances and six hundred and ten (610) limit level exceedances for suspended solids were recorded during mid ebb tide since the commencement of the water quality monitoring.

 

A15. In this reporting period, 104 times of landfill gas monitoring were recorded at Wan Po Road (Ch1+513 - Ch1+625). No action and limit level exceedance for methane, oxygen and carbon dioxide was recorded.

 

A16. Weekly site inspections of the construction works were also carried out by ET to audit the mitigation measures implementation status. Thirteen (13) times of weekly Joint site inspections were carried out by ET and IEC.

 

A17.  A summary of the EM&A activities in this reporting period is listed in Table I and summary of the environmental exceedance of the reporting period is tabulated in Table II.


 

Table I             Summary Table for EM&A Activities in the Reporting Period

EM&A Activities

June 2022

July 2022

August 2022

Noise Monitoring

N/A

N/A

N/A

Water Quality Monitoring

2, 4, 7, 9, 11, 13, 15,

17 20, 22, 24, 28 and

30 Jun 2022

5, 7, 9, 12, 14, 16, 19,

21, 23, 26, 28 and 30

Jul 2022

2, 4, 6, 9, 11, 13, 15,

17, 21, 23, 27 and 30

Aug 2022

 

Landfill Gas monitoring

 

N/A

2, 4, 5, 6, 7, 8, 9, 11,

12, 13, 14, 15, 16, 18,

19, 20, 21, 22, 23, 25,

26, 27, 28, 29 and 30

Jul 2022

1, 2, 3, 4, 5, 6, 8, 9, 10,

11, 12, 13, 15, 16, 17,

18, 19, 20, 22, 23, 24,

25, 26, 27, 29, 30 and

31 Aug 2022

Environmental Site Inspection

7, 14, 21 and 28 Jun

2022

5, 12, 19 and 29 Jul

2022

2, 9, 16, 23 and 31

Aug 2022

 

 

Table II           Summary Table for Exceedance in the Reporting Period

 

Environmental Monitoring

 

Parameter

No. of non- Project related

exceedance

Total No. of non-Project related exceedance

No. of Project related

exceedance

Total No. of Project related exceedance

AL

LL

AL

LL

Noise

Leq (30min)

N/A

N/A

N/A

N/A

N/A

N/A

 

 

Water

DO

0

0

0

0

0

0

Turbidity

0

0

0

0

0

0

SS

44

25

69

0

0

0

pH

0

0

0

0

0

0

Salinity

0

0

0

0

0

0

 

Landfill Gas

O2

0

0

0

0

0

0

CH4

0

0

0

0

0

0

CO2

0

0

0

0

0

0

 

Complaint Handling and Prosecution

 

A18. One environmental complaint was received from the EPD in the reporting period, no notifications of summons and prosecution was received during the reporting period.

 

Reporting Change

 

A19.    There was no change to be reported that may affect the on-going EM&A programme.

 

 

 

 

 


 

Basic Project Information

 

1.1.      Background

The Acciona Agua, S.A. Trading, Jardine Engineering Corporation Limited and China State Construction Engineering (Hong Kong) Limited and as AJC Joint Venture (AJCJV) is contracted to carry out the Design, Build and Operate First Stage of Tseung Kwan O Desalination Plant (DPTKO) under Contract No. 13/WSD/17 (the Contract).

Acuity Sustainability Consulting Limited (ASCL) is commissioned by AJCJV to undertake the Environmental Team (ET) services as required and/or implied, both explicitly and implicitly, in the Environmental Permit (EP), Environmental Impact Assessment Report (EIA Report) (Register No. AEIAR-192/2015) and Environmental Monitoring and Audit Manual (EM&A Manual) for the Contract; and to carry out the Environmental Monitoring and Audit (EM&A) programme in fulfillment of the EIA Report’s EM&A requirements and Contract No. 13/WSD/17 Specification requirements.

Pursuant to the Environmental Impact Assessment Ordinance (EIAO), the Director of Environmental Protection granted the Environmental Permit (No. EP-01/503/2015) and Variation of Environmental Permit (No. EP-01/503/2015/A) to Water Supplies Department (WSD); and granted the Further Environmental Permit (No. FEP-01/503/2015/A) to AJCJV for the Contract.

1.2.      The Reporting Scope

This is the 10th Quarterly EM&A Report for the Project which summarizes the key findings of the EM&A programme during the reporting period from 1 June 2022 to 31 August 2022.

 

1.3.      Project Organization

The Project Organization structure for Construction Phase is presented in Figure 1.1.

 


                                                                                Figure 1.1       Project Organization Chart

 

 

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

 

Table 1.1        Contact Details of Key Personnel

 

 

Party

 

Position

 

Name

Telephone no.

Project Proponent

SE/CM2

Benny Lam

2634-3573

 

Supervising Officer (Binnies Hong Kong Limited)

Project Manager

Christina Ko

2608-7302

Chief Resident Engineer

 

Roger Wu

 

6343-1002

The Jardine Engineering Corporation, Limited, China State Construction Engineering (Hong Kong) Limited and Acciona Agua,

S.A. Trading

Project Manager

Stephen Yeung

2807-4665

 

Environmental Monitoring Manager

 

Brian Kam

 

9456-9541

Acuity Sustainability Consulting Limited

Environmental Team Leader

 

Jacky Leung

 

2698-6833

 

ANewR Consulting Limited

Independent Environmental Checker (IEC)

 

Louis Kwan

 

2618-2831

 

1.4.      Summary of Construction Works

Details of the major construction activities undertaken in this reporting period are shown as below. The construction programme is presented in Appendix A.

 

ActiDAFF

-            Underground utility (UU) Construction Work

-            Water proofing work on roof of Cartridge Filter Plant Room and Construction of kiosk and installation of louvre

-            Construction of Side Tanks No. 5 8

-            Installation of GRP Casts in Media Chambers co. 9 16

 

CLP 132kV Substation

-            Underground utility (UU) Construction Work

-            Construction of temporary emergency vehicular access (eva)

 

On-Site Chlorine Generation Building (OSCG Bldg)

-            Internal finishing work

-            Water tightness test of water tank & flat roof

 

CO2 Tank Area

-            Internal finishing work


 

Administration Building

-            Construction of parapet and internal finishes at G/F, 1/F and 2/F

-            Installation of hoarding on 2/F

-            Construction of 3/F to 4/F walls and columns

-            Installation of curtain wall supports

 

Inspection corridor

-            Construction of stair tower and Steel fixing works for segment 6 and segment 4

-            Construction of columns and beams of FT-5, FT6, FT7 and FT-8

 

Post Treatment Building (PTB)

-            Construction of Sludge thickener, Post Treatment Building

-            Water tightness test of water tank & flat roof

 

Product Water Storage Tank (PWST)

-            Underground utility (UU) Construction Work

-            Carbon steel pipe installation Work

-            Design for Manufacturing and Assembly (DfMA) installation at PWST South side

-            Water tightness test of water tank & flat roof

 

Chemical Building

-            Underground utility (UU) Construction Work

-            Water proofing work on roof

-            Carrying out of Finishing works in the Plant Room

 

Reverse Osmosis (RO) Building

-            Underground utility (UU) Construction Work

-            Staircases and internal finishing work

-            DfMA installation at RO Building North side

-            Water tightness test of water tank & flat roof

 

Main Electrical and Central Chiller Plant building (MECCP)

-            Installation of louvre, metal doors and timber doors

-            Water tightness test of water tank & flat roof

 

Outfall Shaft

-            Install marine outfall structure, concreting, GRP Pipe installation, Dredging for diffuser

-            Bulkhead installation at Outfall tunnel

 

Intake Shaft

-            Levelling of formation level & install marine intake structure

-            General cleaning for finial inspection and flooded by seawater at Intake tunnel

 

Combined Shaft

-            Permanent structure construction from +4.9mPD to +15.3mPD

 

Pump room

-            Permanent structure Wall construction from +6.8 to 14.3mPD


 

Open Channel

-            Trench excavation and structure installation, grouting and backfill

 

Slope

-            Excavation at slope toe and access erection, mini piles construction

 

EM&A Works

-            Installation of building services, Lifting of steel tanks at Chemical Building

-            Installation of building services at Administration Building

-            Installation of building services, Lifting of lime silo, filter press and piping at PTB

-            Installation of building services, mechanical equipment, steel pipe at PWST

-            Installation of building services, steel pipe, Glass fiber reinforced plastics pipe pipe and lifting of electrical switchboard at RO Building

-            Installation of chillers, building services and electrical switchboard at MECCP

-            Scaffolding, installation of mechanical equipment and piping at ActiDAFF

 

1.5.      Summary of Environmental Status

A summary of the valid permits, licences, and /or notifications on environmental protection for this Project is presented in Table 1.2.

Table 1.2        Summary of the Status of Valid Environmental Licence, Notification, Permit and Documentations

 

Permit/ Licenses/ Notification

Reference

Validity Period

Environmental Permit

FEP - 01/503/2015/A

Throughout the Contract

Notification of Construction Works under

the Air Pollution Control (Construction Dust) Regulation (Form NA)

 

Ref. No.: 451539

-

Billing Account for Disposal of Construction Waste

7036276

Throughout the Contract

Chemical Waste Producer Registration

5213-839-A2987-01

Throughout the Contract

Wastewater Discharge Licence (Land and Marine works)

WT00035775-2020

24/07/2020 -

31/07/2025

Construction Noise Permit for general works, TBM at combined shaft and marine works

GW-RE0337-22

01/05/2022 -

31/10/2022

GW-RE0627-22

29/06/2022 -

21/12/2022


 

The status for all environmental aspects is presented in Table 1.3.

 

Table 1.3   Summary of Status for Key Environmental Aspects under the EM&A Manual

 

Parameters

Status

Water Quality

Baseline Monitoring under EM&A Manual

The baseline water quality monitoring was conducted between 12 May 2020 and 6 June 2020

Impact Monitoring

On-going

Noise

 

Baseline Monitoring

The baseline noise monitoring result has been reported in Baseline Monitoring Report and submitted to EPD

under EP Condition 3.4

Impact Monitoring

On-going

Waste Management

Mitigation Measures in Waste Management Plan

On-going

Landfill Gas

Regular Monitoring when Construction Works are within the 250m Consultation Zone

In this reporting period, 104 times of landfill gas monitoring were recorded at Wan Po Road (Ch1+360 - Ch1+513). No exceedance of action and limit level for

methane, oxygen and carbon dioxide was observed.

Environmental Audit

Site Inspection covering Measures of Air Quality, Noise Impact, Water

Quality, Waste, Ecological Quality, Fisheries, Landscape and Visual

 

On-going

 

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

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.

 

 

 

 

 


 

Noise

 

2.1.      Monitoring Requirements

To ensure no adverse noise impact, construction noise monitoring is recommended to be carried out within 300m radius from the nearby noise sensitive receivers (NSRs), during construction phase. The NSRs selected as monitoring station are (i) NSR4 - Creative Secondary School, (ii) NSR24 - PLK Laws Foundation College, and (iii) NSR31 - School of Continuing and Professional Studies - CUHK respectively.

No impact construction noise monitoring was conducted in the reporting period due to the overly distant monitoring station from the works location, where they were farther than 1 km from the closet monitoring station NSR4 to the works location.

2.2.      Monitoring Parameters, Frequency and Duration

Construction noise level would be 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

Duration

Interval

Parameters

Daytime: 0700-1900

Day time:

0700-1900

(during normal weekdays)

Continuously in

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

Leq 30min

L10 30min & L90 30min

 

2.3.      Monitoring Locations

The monitoring locations should normally be made at a point 1m from the exterior of the NSRs building façade and be at a position 1.2m above the ground. A correction of +3dB(A) should be made to the free-field measurements.

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 below.

Table 2.2   Noise Sensitive Receivers

 

NSR ID

Noise Sensitive Receivers

Monitoring Location

Position

NSR 4

Creative Secondary School

Roof Floor

1 m from facade

NSR 24

PLK Laws Foundation College

Pedestrian Road on Ground Floor

Free-field

NSR 31

School of Continuing and Professional Studies - CUHK

Roof Floor

1 m from facade


 

The monitoring locations should normally be made at a point 1m from the exterior of the NSRs building façade and be at a position 1.2m above the ground. A correction of +3dB(A) should be made to the free-field measurements. Three noise monitoring locations for impact monitoring at the nearby sensitive receivers are shown in Figure 2.1-2.3.

 

 

Figure 2.1 NSR4 Creative Secondary School

 

Figure 2.2 NSR24 PLK Laws Foundation College


 

 

Figure 2.3 NSR31 School of Continuing and Professional Studies - CUHK

 

2.4.      Action and Limit Levels

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 Levels for Construction Noise Monitoring per EM&A Manual

 

Time Period

Action Level

Limit Level (dB(A))

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

 

If exceedances were found during noise monitoring, the actions in accordance with the Event and Action Plan shall be carried out according to Appendix E.


 

2.5.      Monitoring Results and Observations

 

Referring to EM&A manual Section 4.1.2, the impact noise monitoring should be carried out when there are project-related construction activities undertaken within a radius of 300m from the monitoring stations. No noise monitoring station was located within a radius of 300m of the Project site as shown in Figure 2.4, no impact monitoring for noise impact was conducted in the reporting period.


 

Figure 2.4       Site Layout Plan with Noise Sensitive Receivers and Desalination Plant

 

 

 

 

 


 

Water Quality

 

In accordance with the recommendations of the EIA, water quality monitoring is required during dredging for the submarine pipelines and, during operation phase. In addition, baseline water quality monitoring was conducted prior to the commencement of marine construction activities.

The following Section provides details of the water quality monitoring to be undertaken by the Environmental Team (ET) to verify the distance of sediment and brine plume dispersion and to identify whether the potential exists for any indirect impacts to occur to ecological sensitive receivers. The water quality monitoring programme was carried out to allow any deteriorating water quality to be readily detected and timely action taken to rectify the situation.

Water quality monitoring for the Project can be divided into the following stages:

 

-                      Dredging activities during construction phase;

-                      Discharge of effluent from main disinfection during construction phase;

-                      Operation phase - first year upon commissioning; and,

-                      Continuous monitoring of effluent quality.

 

3.1.      Water Quality Parameters

The parameters that have been selected for measurement in situ and in the laboratory are those that were either determined in the EIA to be those with the most potential to be affected by the construction works or are a standard check on water quality conditions. Parameters measured in the impact monitoring are listed in Table 3.1

Table 3.1   Parameters measured in the impact marine water quality monitoring