I. Introduction

This is the 3^rd Monthly EM&A Report prepared by Fugro Technical Services Limited for the Contract no. HY/2018/08 Central Kowloon Route – Central Tunnel. The Contract no. HY/2018/08 commenced on 19 September 2019. This report summarized the monitoring results and audits findings of the EM&A programme under the issued EP (EP No.: EP-457/2013/C) and in accordance with the EM&A Manual during the reporting period from 01/11/2019 to 30/11/2019.

II. Summary of Main Works Undertaken and Key Measures Implemented

The main construction works carried out in the reporting period were as follow:

· Pre-treatment for diaphragm wall;

· Pre-drilling for ventilation building foundation;

· Prebored H piling for ventilation shaft;

· Modification of existing shaft enclosure;

· Site installation;

· Erection of main site office.

III. Summary of Exceedances, Investigation and Follow-up

No Action or Limit Level Exceedance was recorded in the reporting period.

IV. Complaint Handling, Prosecution and Public Engagement

No complaints, notification of summons and prosecutions were received in the reporting period.

No public engagement activities were conducted in the reporting period.

V. Reporting Change

There were no reporting changes during the reporting month.

VI. Future Key Issues

The main works will be anticipated in the next reporting period are as follow:

· Pre-treatment for diaphragm wall;

· Prebored H piling for ventilation shaft;

· Modification of existing shaft enclosure;

· Site installation;

· Initial tunnel excavation;

· Mucking out from tunnel;

· Erection of main site office.

The recommended mitigation measures corresponding to the main works in the next reporting period are listed as follow:

· Mitigation measures in form of regular watering under a good site practice should be adopted;

· Any excavated, stockpile of dusty material or load of dusty materials on a vehicle leaving a construction site should be covered entirely by impervious sheeting;

· Bulk stock of cement, dry pulverised fuel ash (PFA) or works of grout mixing should be covered entirely by impervious sheeting or placed in an area sheltered on the top and the 3 sides;

· All construction plants / machineries should be checked / serviced on a regular basis during the courses of construction to minimize the emission of noise generation and eliminate dark smoke emission;

· All C&D materials generated should be transported and stored at temporary storage area. Suitable materials should be sorted for reuse on-site;

· Wastewater generated from drilling shall be properly collected for reuse or treated by wastewater treatment facilities before discharge;

· Provision of drip trays for equipment likely cause spillage of chemical / fuel, and provide routine maintenance;

· Conditions in the Environmental Permit and License should be followed;

· All recommended mitigation measures specified in the approved EIA Report and EM&A Manual shall be implemented.

The following EP submissions (EP-457/2013/C) were submitted during the reporting month:

Table I Status of Required Submission under Environmental Permit

EP Condition	Submission	Submission Date
3.4	Monthly EM&A Report (October 2019)	14 November 2019

Contents

EXECUTIVE SUMMARY i

1. Introduction 1

1.1 Background 1

1.2 Project Organization 2

1.3 Construction Programme and Activities 2

1.4 Works undertaken during the month 2

1.5 Status of Environmental Licences, Notification and Permits 2

2. ENVIRONMENTAL MONITORING REQUIREMENTS 3

2.1 Construction Dust and Noise Monitoring Location 3

2.2 Construction Dust Monitoring 3

2.3 Construction Noise Monitoring 6

2.4 Construction Dust and Noise Monitoring Schedule 7

2.5 The Action and Limit Levels 7

2.6 Landscape and Visual 7

3. ENVIRONMENTAL MONITORING RESULTS 8

3.1 Construction Dust Monitoring 8

3.2 Construction Noise Monitoring 8

3.3 Waste Management 9

3.4 Landscape and Visual 9

4. ENVIRONMENTAL SITE INSPECTION AND AUDIT 10

5. ENVIRONMENTAL COMPLAINT AND NON-COMPLIANCE 11

5.1 Complaint Handling, Prosecution and Public Engagement 11

5.2 Summary of Environmental Non-Compliance 11

6. IMPLEMENTATION STATUS OF ENVIRONMENTAL MITIGATION MEASURE 12

7. FUTURE KEY ISSUES 13

8. CONCLUSION AND RECOMMENDATIONS 14

Tables

Table I - Status of Required Submission under Environmental Permit

Table 1.1 - Contact Information of Key Personnel

Table 2.1 - Construction Dust and Noise Monitoring Location

Table 2.2 - Construction Dust Monitoring Equipment

Table 2.3 - Construction Noise Monitoring Parameters, Frequency and Duration

Table 2.4 - Construction Noise Monitoring Equipment

Table 3.1 - Summary of 1-hour TSP Monitoring Results in the Reporting Period

Table 3.2 - Summary of 24-hour TSP Monitoring Results in the Reporting Period

Table 3.3 - Summary of Construction Noise Monitoring Results in the Reporting Period

Table 4.1 - Observations and Recommendation of Site Inspection in the Reporting Period

Table 6.1 - Status of Required Submission under Environmental Permit

Table 1.2 - Environmental Licenses, Notification and Permits Summary

Figures

Figure 1 The Site Layout Plan of the Contract

Figure 2 The Location of the Construction Dust and Noise Monitoring Station

Appendices

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Appendix A Construction Programme

Appendix B Project Organization Chart

Appendix C Calibration Certificate for Construction Dust Monitoring Equipment

Appendix D Calibration Certificate for Construction Noise Monitoring Equipment

Appendix E Environmental Monitoring Schedule

Appendix F Action and Limit Levels for Construction Dust and Noise Monitoring

Appendix G Construction Dust Monitoring Results and Meteorological Observations

Appendix H Construction Noise Monitoring Results

Appendix I Event and Action Plan

Appendix J Implementation Status of Environment Mitigation Measures (Construction Phase)

Appendix K Cumulative Statistics on Exceedances, Complaints, Notifications of Summons and Successful Prosecutions

Appendix L Waste Flow Table

1. INTRODUCTION

1.1 Background

1.1.1 In order to meet the traffic demand and relieve traffic congestion on the existing east-west roads across Central Kowloon, Central Kowloon Route (CKR) (hereinafter referred to as “the Project”) is proposed which is a 4.7 km long dual 3-lane trunk road in Central Kowloon linking Yau Ma Tei Interchange in West Kowloon with the road network on Kai Tak Development and Kowloon Bay in East Kowloon.

1.1.2 The Central Kowloon Route – Design and Construction Environmental Impact Assessment Report (Register No.: AEIAR-171/2013) was approved with conditions by the Environmental Protection Department (EPD) on 11 July 2013. An Environmental Permit (EP-457/2013) was issued on 9 August 2013. Variations of EP (VEP) was subsequently applied for and the latest EP (EP-457/2013/C) was issued by EPD on 16 January 2017.

1.1.3 Contract no. HY/2018/08 Central Kowloon Route – Central Tunnel (hereinafter referred to as “the Contract”), is one of the contracts of CKR which included the construction of the central tunnel, cut-and-cover tunnels at Yau Ma Tei and Ma Tau Kok and construction of piles and diaphragm walls for Ho Man Tin ventilation building.

1.1.4 Fugro Technical Services Limited (FTS) was appointed by Bouygues Travaux Publics (BTP) as the Environmental Team (ET) under the Contract no. HY/2018/08) to execute the environmental monitoring and audit (EM&A) programme under the issued EP (EP No.: EP-457/2013/C) and in accordance with the EM&A Manual.

1.1.5 This is the 3^nd Monthly EM&A Report prepared by FTS for the Contract no. HY/2018/08 Central Kowloon Route – Central Tunnel. The Contract no. HY/2018/08 commenced on 19 September 2019. This report summarized the monitoring results and audits findings of the EM&A programme under the issued EP (EP No.: EP-457/2013/C) and in accordance with the EM&A Manual during the reporting period from 01/11/2019 to 30/11/2019.

1.2 Project Organization

1.2.1 The Project Organization structure is shown in Appendix B. The key personnel contact names and numbers are summarized in Table 1.1.

Table 1.1 Contact Information of Key Personnel

Party	Position	Name	Telephone
Highways Department (HyD)	E13/CKR	Mr. Joe Lam	2762 3380
Arup-Mott MacDonald Joint Venture (AMMJV)	Senior Resident Engineer	Mr. Ben Poon	3619 5967
ERM-Hong Kong, Limited (ERM)	Independent Environmental Checker (IEC)	Ms. Mandy To	2271 3000
Bouygues Travaux Publics (BTP)	Environmental Manager	Mr. Simon Wong	9281 4346
Fugro Technical Services Limited	ET Leader	Mr. David Hung	3565 4371

1.3 Construction Programme and Activities

1.3.1 The construction phase of this Contract under the EP was commenced in October 2019. The site layout plan of the Contract is shown in Figure 1.

1.3.2 The construction programme of this Contract is shown in Appendix A.

1.4 Works undertaken during the month

1.4.1 The main construction works carried out in the reporting period were as follow:

· Pre-treatment for diaphragm wall;

· Pre-drilling for ventilation building foundation;

· Prebored H piling for ventilation shaft;

· Modification of existing shaft enclosure;

· Site installation;

· Erection of main site office.

1.5 Status of Environmental Licences, Notification and Permits

1.5.1 A summary of the relevant permits, licenses and/or notifications on environmental protection for this Contract is presented in Table 1.2.

Table 1.2 Environmental Licenses, Notification and Permits Summary

Permit/ Notification/ License	Reference No	Valid From	Valid Till
Form NB	448930, 448970, 448971	Mid-Sep 2019	NA
Billing Account for Disposal of C&D waste	Account no. 7034790	6 Aug 2019	NA
Chemical Waste Producer Registration	5111-236-B2557-02	25 Sep 2019	NA
Construction Noise Permit	GW-RE0785-19	4 Oct 2019	3 Jan 2020
Water Discharge License	WT00034873-2019	22 Nov 2019	30 Nov 2024

2. ENVIRONMENTAL MONITORING REQUIREMENTS

2.1 Construction Dust and Noise Monitoring Location

2.1.1 The monitoring station for construction dust and noise monitoring pertinent to the Project has been identified based on the approved EM&A Manual for the Project. The location of the construction dust and noise monitoring station is summarized in Table 2.1 and displayed in Figure 2.

Table 2.1 Construction Dust and Noise Monitoring Location

Dust Monitoring Station ID	Noise Monitoring Station ID	Monitoring Location
M-A3	M-N3	SKH Tsoi Kung Po Secondary School

Notes:

1. The dust and noise monitoring station proposed in the EM&A Manual (i.e. Ko Fai House, Kwun Fai Court with ID: M-A6/ M-N6) was not available for impact dust and noise monitoring, therefore impact monitoring was conducted at M-A3/M-N3 as an alternative which was agreed by the ER, IEC and EPD;

2. The coordinates of SKH Tsoi Kung Po Secondary School can be represented as follow:

Latitude: 22.314719, Longitude: 114.180694 (HK80 Geographical Coordinates)

2.2 Construction Dust Monitoring

Monitoring Requirement

2.2.1 In accordance with the approved EM&A Manual, 1-hour and 24-hour Total Suspended Particulates (TSP) levels should be measured at the designated air quality monitoring stations to indicate the impacts of construction dust on air quality. Regular Impact 24-hour TSP monitoring should be carried out for at least once every 6 days, and 1-hour TSP monitoring should be done at least 3 times every 6 days when the highest dust impact occurs.

Monitoring Equipment

2.2.2 24-hour TSP air quality monitoring was performed using High Volume Sampler (HVS) deployed at the designated monitoring station. The HVS shall meet all the requirements of the EM&A Manual.

2.2.3 A portable direct reading dust meter was used to carry out the 1-hour TSP monitoring.

2.2.4 The model of the dust monitoring equipment used is summarized in Table 2.2.

Table 2.2 Construction Dust Monitoring Equipment

Equipment

Brand

Model

Serial No.

High Volume Sampler

(24-hour TSP)

Tisch

TE-5170

4388

Portable direct reading dust meter (1-hour TSP)

Sibata

Model LD-3B

647594

Monitoring Methodology for HVS

2.2.5 The following guidelines were adopted during the installation of HVS:

· Sufficient support is provided to secure the samplers against gusty wind.

· No two samplers are placed less than 2 meters apart.

· The distance between the sampler and an obstacle, such as buildings, is at least twice the height that the obstacle protrudes above the sampler.

· A minimum of 2 meters of separation from walls, parapets and penthouses is required for rooftop samples.

· A minimum of 2 meters separation from any supporting structure, measured horizontally is required.

· No furnaces or incineration flues are nearby.

· Airflow around the samplers is unrestricted.

· The samplers are more than 20 meters from the drip line.

· Any wire fence and gate, to protect the sampler, should not cause any obstruction during monitoring.

· Permission must be obtained to set up the samplers and to obtain access to the monitoring stations.

· A secured supply of electricity is needed to operate the samplers.

2.2.6 Prior to the commencement of the dust sampling, the flow rate of the high volume sampler shall be properly set. The power supply should be checked to ensure the proper functioning of the sampler. The sampler is recommended to be operated for 5 minutes to establish thermal equilibrium before placing any filter media at the designated air monitoring station.

2.2.7 The filter holding frame should be removed by loosening the four nuts and placing carefully a weighted and conditioned filter at the centre with the stamped number upwards on a supporting screen.

2.2.8 The filter should be aligned on the screen so that the gasket formed an airtight seal on the outer edges of the filter. The filter holding frame should be tightened to the filter holder with swing bolts. The applied pressure should be sufficient to avoid air leakage at the edges.

2.2.9 A programmed timer should be used to control the duration of operation. Information should be recorded on the record sheet, which included the starting time, the weather condition and the filter number.

2.2.10 After sampling process is finished, the filter should be removed and sent to the laboratory for weighting. The elapsed time should also be recorded.

2.2.11 All filters should be equilibrated in a conditioning environment for 24 hours before weighting. The conditioning environment temperature should be between 25°C and 30°C and not vary by more than ±3°C; the relative humidity (RH) should be <50% and not vary by more than ±5%. A convenient working RH is 40%.

Maintenance and Calibration for HVS

2.2.12 The high volume motors and their accessories should be properly maintained, including routine motor brushes replacement and electrical wiring checking, to ensure that the equipment and a continuous power supply were in good working condition.

2.2.13 Initial calibration of dust monitoring equipment shall be conducted upon installation and thereafter at fortnightly intervals. The transfer standard shall be traceable to the internationally recognized primary standard and be calibrated annually. The calibration certificate for the HVS is provided in Appendix C.

Monitoring Methodology for Direct Reading Dust Meter

2.2.14 Portable Laser Particle Photometer Monitors should be operated in accordance with the Manufacturer’s instruction Manual as below:

a) Pulling up the air sampling inlet cover

b) Changing the Mode 0 to BG

c) Pressing Start/Stop switch

d) Turning the knob to SENSI.ADJ and press it

e) Pressing Start/Stop switch again

f) Returning the knob to the position MEASURE slowly

g) Pressing the timer set switch to set measuring time

h) Removing the cap and start the measurement

Maintenance and Calibration for Direct Reading Dust Meter

2.2.15 ET shall submit sufficient information to the IEC to prove that the instrument is capable of achieving comparable results to the HVS. The instrument should also be calibrated regularly, and the 1-hour sampling shall be determined periodically by the HVS to check the validity and accuracy of the results measured by direct reading method. The calibration certificate for the direct reading dust meter is provided in Appendix C.

2.3 Construction Noise Monitoring

Monitoring Requirement

2.3.1 In accordance with the EM&A Manual, impact noise monitoring should be conducted at the designated noise monitoring stations for at least once a week during the construction phase of the Project. The parameters, frequency and duration of impact noise monitoring is summarized in Table 2.3.

Table 2.3 Construction Noise Monitoring Parameters, Frequency and Duration

Parameter	Duration	Frequency
A-weighted equivalent continuous sound pressure level (Leq). L10 and L90 were also recorded	30 minutes	At least once per week

Monitoring Equipment

2.3.2 Noise monitoring was performed using sound level meter at the designated monitoring station. The sound level meters deployed comply with the International Electrotechnical Commission Publications 651:1979 (Type 1) and 804:1985 (Type 1) specifications. Acoustic calibrator was deployed to check the sound level meters at a known sound pressure level.

2.3.3 The model of the noise monitoring equipment used is summarized in Table 2.4.

Table 2.4 Construction Noise Monitoring Equipment

Equipment	Brand	Model	Serial No.
Acoustic Calibrator	Casella	CEL-120	4358443
Sound Level Meter	Casella	CEL-63X	4181568

Monitoring Methodology

2.3.4 Noise measurement should be conducted as the following procedures:

a) Free field measurements was made at monitoring location M-N3. A correction of +3 dB(A) shall be made to the free field measurements.

b) The battery condition should be checked to ensure good functioning of the meter.

c) Parameters such as frequency weighting, the time weighting and the measurement time should set as follow:

(i) Frequency weighting: A

(ii) Time weighting: Fast

(iii) Measurement time: continuous 5 minutes interval

d) Prior to and after noise measurement, the meter shall be calibrated using the calibrator for 94.0 dB at 1000 Hz. If the difference in the calibration level before and after measurement is more than 1.0 dB, the measurement will be considered invalid and repeat of noise measurement is required after re-calibration or repair of the equipment.

e) The wind speed at the monitoring station shall be checked with the portable wind meter. Noise monitoring should be cancelled in the presence of fog, rain, and wind with a steady speed exceeding 5 m/s, or wind with gusts exceeding 10 m/s.

f) Noise measurement should be paused during periods of high intrusive noise if possible and observation shall be recorded when intrusive noise is not avoided.

g) At the end of the monitoring period, the Leq, L10 and L90 should be recorded. In addition, site conditions and noise sources should also be recorded on a standard record sheet.

Maintenance and Calibration

2.3.5 Maintenance and calibration procedures should also be carried out, including:

a) The microphone head of the sound level meter and calibrator should be cleaned with a soft cloth at quarterly intervals.

b) The sound level meter and calibrator should be calibrated annually by a HOKLAS laboratory or the manufacturer.

The calibration certificates for noise monitoring equipment are provided in Appendix D

2.4 Construction Dust and Noise Monitoring Schedule

2.4.1 The environmental monitoring schedule for the reporting period is provided in Appendix E.

2.5 The Action and Limit Levels

2.5.1 The Action and Limit Levels for construction dust and noise monitoring are provided in Appendix F.

2.6 Landscape and Visual

2.6.1 As per the EM&A Manuals, the landscape and visual mitigation measures shall be implemented and site inspections should be undertaken once every two weeks during the construction period. A summary of the implementation status is presented in Section 4.

3. ENVIRONMENTAL MONITORING RESULTS

3.1 Construction Dust Monitoring

3.1.1 The monitoring results for 1-hour TSP and 24-hour TSP are summarized in Table 3.1 and Table 3.2 respectively. Detailed construction dust monitoring results and daily extract of meteorological observations are presented in Appendix G.

Table 3.1 Summary of 1-hour TSP Monitoring Results in the Reporting Period

Station ID	Average (µg/m³)	Range (µg/m³)	Action Level (µg/m³)	Limit Level (µg/m³)
M-A3	86	50 – 107	333	500

Table 3.2 Summary of 24-hour TSP Monitoring Results in the Reporting Period

Station ID	Average (µg/m³)	Range (µg/m³)	Action Level (µg/m³)	Limit Level (µg/m³)
M-A3	74	61 – 95	153	260

3.1.2 No Action and Limit Level exceedance was recorded for 1-hour TSP monitoring and 24-hour TSP monitoring at the monitoring location in the reporting month.

3.1.3 Major dust sources during the monitoring included nearby traffic emission.

3.1.4 The Event and Action Plan for the construction dust monitoring is given in Appendix I.

3.2 Construction Noise Monitoring

3.2.1 The monitoring results for noise are summarized in Table 3.3 and the monitoring data is given in Appendix H.

Table 3.3 Summary of Construction Noise Monitoring Results in the Reporting Period

Station ID

¹Measured Noise Level, dB(A), Leq (30 mins)

Action Level

³Limit Level dB(A), Leq (30 mins)

M-N3

68.1– 69.8

When one documented compliant is received

For Schools:

70dB(A) during normal teaching period and 65 dB(A) during examination periods

Note:

1. Free field noise levels were adjusted with a correlation of +3 dB(A);

3.2.2 No Action and Limit Level exceedance was recorded for construction noise monitoring at the monitoring location in the reporting month.

3.2.3 Major noise sources during the monitoring included nearby traffic emission and school activities.

3.2.4 The Event and Action Plan for the construction noise monitoring is given in Appendix I.

3.3 Waste Management

3.3.1 Auditing of waste management practices during regular site inspections were confirmed that the waste generated during construction were properly, stored, handled and disposed of in general. The Contractor was responsible for the implementation of any mitigation measures to reduce waste or redress issues arising from the waste materials.

3.3.2 The implemented environmental mitigation measures for the waste management in the reporting period are summarized in Appendix J. The summary of observations and recommendations made for waste management during the site inspections are presented in Table 4.1.

3.3.3 Monthly summary of waste flow table is detailed in Appendix L.

3.4 Landscape and Visual

3.4.1 Bi-weekly inspection of the implementation of landscape and visual mitigation measures was conducted on 5 and 19 November 2019. The implementation the landscape and visual mitigation measures in the reporting period are summarized in Appendix J. The summary of observations and recommendations made for landscape and visual mitigation measures during the site inspections are presented in Table 4.1.

3.4.2 The Event and Action Plan for landscape and visual during construction phase is given in Appendix I.

4. ENVIRONMENTAL SITE INSPECTION AND AUDIT

4.1.1 Site inspections were carried out on a weekly basis to monitor the implementation of proper environmental pollution control and mitigation measures for the Project. A summary of the mitigation measures implementation status is provided in Appendix J.

4.1.2 The outstanding items of observation which recorded in the site inspection on 29 October 2019 were rectified by the Contractor on 4 November 2019. In the reporting month, four site inspections were carried out on 5, 13, 19 and 26 November 2019. Details of observations recorded during the site inspections are presented in Table 4.1.

Table 4.1 Observations and Recommendation of Site Inspection in the Reporting Period

Environmental Aspect	Date	Observations and Recommendations	Follow-up Actions
5. Air Quality	5 Nov 2019	The Contractor was reminded to provide frequent water spray of site area to avoid dust emission.	The item was rectified by the Contractor on 8 Nov 2019.
	13 Nov 2019	The Contractor was reminded to keep clear of deposited material at the vehicle entrance/exit leading to site area.	The item was rectified by the Contractor on 19 Nov 2019.
	19 Nov 2019	Non-road Mobile Machinery (NRMM) label shall be provided for the air compressor.	The item was rectified by the Contractor on 26 Nov 2019.
	26 Nov 2019	The Contractor was reminded to cover/remove the excavated material and provide regular watering of site area to prevent fugitive dust.	The item was rectified by the Contractor on 30 Nov 2019.
Noise	Nil	Nil	Nil
Water Quality	5 Nov 2019	The Contractor was reminded to provide bunding/sandbag around discharge point to avoid outflow of site water.	The item was rectified by the Contractor on 8 Nov 2019.
Waste Management	19 Nov 2019	Chemical shall be stored properly to avoid spillage.	The item was rectified by the Contractor on 26 Nov 2019.
Waste Management	26 Nov 2019	The Contractor was reminded to store the chemicals properly.	The item was rectified by the Contractor on 30 Nov 2019.
Landscape and Visual	Nil	Nil	Nil
Permit/ Licenses	Nil	Nil	Nil

6. ENVIRONMENTAL COMPLAINT AND NON-COMPLIANCE

6.1 Complaint Handling, Prosecution and Public Engagement

6.1.1 No environmental complaints, and no environmental related prosecutions or notification of summons were received in the reporting period.

6.1.2 Cumulative complaint log, summaries of complaints, notification of summons and successful prosecutions are presented in Appendix K.

6.1.3 No public engagement activities were conducted in the reporting period.

6.2 Summary of Environmental Non-Compliance

6.2.1 No environmental non-compliance was recorded in the reporting period.

6.2.2 No Action and Limit Level exceedance was recorded for construction dust and noise monitoring in the reporting month.

7. IMPLEMENTATION STATUS OF ENVIRONMENTAL MITIGATION MEASURE

7.1.1 The Contractor had implemented environmental mitigation measures and requirements as stated in the EIA Reports, the EP and EM&A Manuals. The implementation status of the environmental mitigation measures during the reporting period is summarized in Appendix J. Status of required submissions under the EP during the reporting period is summarised in Table 6.1.

Table 6.1 Status of Required Submission under Environmental Permit

EP Condition	Submission	Submission Date
3.4	Monthly EM&A Report (October 2019)	14 November 2019

8. FUTURE KEY ISSUES

8.1.1 The main works will be anticipated in the next reporting period are as follow:

· Pre-treatment for diaphragm wall;

· Prebored H piling for ventilation shaft;

· Modification of existing shaft enclosure;

· Site installation;

· Initial tunnel excavation;

· Mucking out from tunnel;

· Erection of main site office.

8.1.2 The recommended mitigation measures corresponding to the main works in the next reporting period are listed as follow: