Job No.: TCS00881/18

 

 

 

 

 

 

 

 

 

CEDD Contract CV/2016/10

Site Formation and Associated Infrastructural Works for Development of Columbarium at Sandy Ridge Cemetery

 

 

 

 

 

 

 

 

 

Monthly Environmental Monitoring and Audit Report (No.3) ¡V October 2018

 

 

 

 

 

 

 

 

Prepared For

 

 

 

 

Hsin Chong Tsun Yip Joint Venture

 

 

 

 

 

 

 

 

 

 

 

Date

Reference No.

Prepared By

Certified By

14 November 2018

TCS00881/18/600/R189v2

Nicola Hon

(Environmental Consultant)

Tam Tak Wing

(Environmental Team Leader)

 

Version

Date

Remarks

1

6 November 2018

First Submission

2

14 November 2018

Amended according to the IEC¡¦s comment 12 November 2018

 

 

 

 

 

 

 

 

 


 

 

 

 

executive summary

ES.01.        Civil Engineering and Development Department (hereafter referred as ¡§CEDD¡¨) is the Project Proponent for the Project ¡§Site Formation and Associated Infrastructural Works for Development of Columbarium, Crematorium and Related Facilities at Sandy Ridge Cemetery¡¨ (hereafter referred as ¡§the Project¡¨).  The Project is a Designated Project to be implemented under Environmental Permit No. EP-534/2017.  To facilitate the Project management, the Project works were separated into three different Contracts and they are listed below.

Ÿ   CEDD Contract No. CV/2016/10 - Site Formation and Associated Infrastructural Works for Development of Columbarium at Sandy Ridge Cemetery (hereafter referred as ¡§Contract 1¡¨)

Ÿ   CEDD Contract No. CV/2017/02 - Infrastructural Works at Man Kam To Road and Lin Ma Hang Road for Development of Columbarium at Sandy Ridge Cemetery (hereafter referred as ¡§Contract 2¡¨)

Ÿ   Other CEDD¡¦s Contract as related Development of Columbarium at Sandy Ridge Cemetery (hereafter referred as ¡§Contract 3¡¨)

 

ES.02.        Hsin Chong Tsun Yip Joint Venture (hereafter referred as ¡§HCTYJV¡¨) has been awarded the CEDD Contract No. CV/2016/10 ¡§Site Formation and Associated Infrastructural Works for Development of Columbarium at Sandy Ridge Cemetery¡¨ on 5 December 2017.  According to the Contract requirement, HCTYJV shall take over the responsibility for part of the Environmental Permit No. EP-534/2017 for ease of management, therefore application for Further Environmental Permit was submitted by HCTYJV to EPD on 26 January 2018 and Further Environmental Permit No. FEP-01/534/2017 was granted to HCTYJV by EPD on 23 February 2018.    

 

ES.03.        Action-United Environmental Services & Consulting (hereinafter referred as ¡§AUES¡¨) has been commissioned by HCTYJV as an Environmental Team (hereinafter referred as ¡§the ET¡¨) to implement the Environmental Monitoring & Audit (EM&A) programme in accordance with the approved EM&A Manual as well as the associated duties.

 

ES.04.        As notified by HCTYJV, construction works of the Contract 1 was commenced on 16 August 2018 and therefore construction phase impact monitoring was started on 16 August 2018.

 

ES.05.        This is the 3rd monthly Environmental Monitoring and Audit Report to reporting the monitoring results and inspection findings for the period from 1 to 31 October 2018 (the Reporting Month).

 

Environmental Monitoring and Audit Activities

ES.06.        Environmental monitoring activities under the EM&A program in this Reporting Month is summarized in the following table.

Table ES-4        Environmental monitoring activities in the Reporting Period

Issues

Environmental Monitoring Parameters / Inspection

Monitoring Location under CV/2016/10

Occasions

Air Quality

1-hour TSP

ASR-1

15

24-hour TSP

ASR-1

6

Construction Noise

Leq (30min) Daytime

CN-1

4

Water Quality

In-situ measurement and Water sampling

M3

14

Ecology

Monthly Monitoring

Transect within site area of CV/2016/10

1

Landscape & Visual

Monthly Site Inspection

Site area of CV/2016/10

1

Inspection / Audit

ET Regular Environmental Site Inspection

Site area of CV/2016/10

5

IEC Monthly Environmental Site Audit

Site area of CV/2016/10

1

 

Breach of Action and Limit (A/L) Levels

ES.07.        No exceedance of air quality and construction noise monitoring was recorded in this Reporting Month.  However, four (4) Limit Level exceedances were recorded in water quality monitoring.  Notification of Exceedance (NOE) of water quality was issued.  The statistics of environmental exceedance, NOE issued and investigation of exceedance are summarized in the following table.

Table ES-5        Breach of Action and Limit (A/L) Levels in the Reporting Period

Environmental Issues

Monitoring Parameters

Action Level

Limit Level

Event & Action

NOE Issued

Investigation findings

Corrective Actions

Air Quality

1-hour TSP

0

0

0

-

-

24-hour TSP

0

0

0

-

-

Construction Noise

Leq30min Daytime

0

0

0

-

-

Water Quality

DO

0

0

0

-

-

Turbidity

0

3

3

Not related to the Contract Works

NA

SS

0

1

1

Not related to the Contract Works

NA

Note:      NOE ¡V Notification of Exceedance

 

ES.08.        Investigation for the cause of water quality exceedances have been undertaken by ET. Investigation results revealed that water quality mitigation measures have been implemented to minimize the water quality impact arising from contract works.  Such as temporary bund and de-silting trench were installed at Retaining Wall RW1 to reduce the suspended solids content in runoff.  Series of sheet pile was installed at site boundary to prevent site runoff flowing to the Conservation Area (CA).  In view of the implementation of water quality mitigation measures, the site was generally order and no water quality impact was observed, it is considered that the exceedances were unlikely caused by the works under the Project.

 

Environmental Complaint

ES.09.        No environmental complaint was recorded or received in this Reporting Month.  The statistics of environmental complaint are summarized in the following table.

Table ES-6        Environmental Complaint Summaries in the Reporting Month

Reporting Period

Environmental Complaint Statistics

Frequency

Cumulative

Complaint Nature

1 ¡V 31 October 2018

0

0

NA

 

ES.010.    In addition, no complaints received and emergency events relating to violation of environmental legislation for illegal dumping and landfilling were received.  

 

Notification of Summons and Successful Prosecutions

ES.011.    No environmental summons or successful prosecution was recorded in this Reporting Month.  The statistics of summons or successful prosecutions are summarized in the following tables.

 

Table ES-7        Environmental Summons Summaries in the Reporting Month

Reporting Period

Environmental Summons Statistics

Frequency

Cumulative

Complaint Nature

1 ¡V 31 October 2018

0

0

NA

 

Table ES-8        Environmental Prosecution Summaries in the Reporting Month

Reporting Period

Environmental Prosecution Statistics

Frequency

Cumulative

Complaint Nature

1 ¡V 31 October 2018

0

0

NA

 

Reporting Change

ES.012.    There were no reporting changes in the Reporting Month.

 

Site Inspection

ES.013.    In this Reporting Period, joint site inspections to evaluate the site environmental performance at Contract 1 have been carried out by the RE, ET and the Contractor on 4th, 11th, 19th, 25th and 31st October 2018.  No non-compliance was noted during the site inspection.  Furthermore, IEC attended a joint site inspection on 19th October 2018.

 

Future Key Issues

ES.014.    The Contractors should pay special attention on water quality mitigation measures and fully implement according to the ISEMM of the EM&A Manual, in particular in rainy season to prevent surface runoff with high SS content and other pollutants from flowing to local stream and Conservation Area (CA).

 

ES.015.    Moreover, air quality and construction noise are the major environmental issues as under the Project Works.  Air quality mitigation measures such as wheel wash facilities, watering of haul roads and covering of dusty materials with tarpaulin sheet should be implemented as far as practicable. Construction noise mitigation measures such as use of movable noise barriers and Quality Powered Mechanical Equipment (QPME) should be properly provided to reduce construction noise impact.

 

ES.016.    Furthermore, daily cleaning and weekly tidiness shall be properly performed and maintained. In addition, mosquito control should be performed to prevent mosquito breeding on site.

 


 

Table of Contents

1     Introduction   1

1.1            Project Background   1

1.2            Report Structure  2

2     Organization and Construction progress of the Works Contract-1  3

2.1            Works Contract-1 Organization and Management Structure  3

2.2            Construction Progress  3

2.3            Summary of Environmental Submissions  3

2.4            Summary of Submission Under the Environmental Permit Requirements  3

3     Summary of Impact Monitoring Requirement   5

3.1            General  5

3.2            Monitoring Parameters  5

3.3            Monitoring Locations  5

3.4            Monitoring Frequency and Period   7

3.5            Monitoring Equipment  8

3.6            Equipment Calibration   10

3.7            Data Management and Data QA/QC Control  11

3.8            Determination of Action/Limit (A/L) Levels  11

4     Air Quality   12

4.1            Monitoring Results  12

4.2            Air Monitoring Exceedance  12

5     Construction Noise   13

5.1            Monitoring Results  13

5.2            Noise Monitoring Exceedance  13

6     Water Quality   14

6.1            Monitoring Results  14

6.2            Water Quality Monitoring Exceedance  14

7     Ecology Monitoring   16

7.1            Requirement  16

7.2            Methodology   16

7.3            Ecological Monitoring Survey Findings  17

8     Landscape and Visual   20

8.1            Requirement  20

8.2            Findings / Deficiencies During Site Inspection in the Reporting Month   20

9     Waste Management   21

9.1            General Waste Management  21

9.2            Records of Waste Quantities  21

10   Site Inspection   22

10.1          Requirement  22

10.2          Findings / Deficiencies During Site Inspection in the Reporting Month   22

11   Environmental Complaint and Non-Compliance   24

11.1          Environmental Complaint, Summons and Prosecution   24

12   Implementation Status of Mitigation Measures  25

12.1          General Requirements  25

12.2          Tentative Construction Activities in the Coming Month   25

12.3          Key Issues for the Coming Month   26

13   Conclusions and Recommentations  27

13.1          Conclusions  27

13.2          Recommendations  27

 


List of TABLES

Table 2-1        Status of Environmental Licenses and Permits

Table 2-2        Status of Submission as under EP and/or FEP Stipulation

Table 3-1        Summary of EM&A Requirements

Table 3-2        Designated Air Quality Monitoring Location under the Project

Table 3-3        Air Quality Monitoring Location as Related the Works Contract-1

Table 3-4        Designated Construction Noise Monitoring Location under the Project

Table 3-5        Noise Monitoring Location as Related the Works Contract-1

Table 3-6        Designated Water Quality Monitoring Stations under the Project

Table 3-7        Water Quality Monitoring Station as Related the Works Contract-1

Table 3-8        Air Quality Monitoring Equipment

Table 3-9        Noise Monitoring Equipment

Table 3-10      Water Quality Monitoring Equipment

Table 3-11      Action and Limit Levels for Air Quality Monitoring

Table 3-12      Action and Limit Levels for Construction Noise

Table 3-13      Action and Limit Levels for Water Quality

Table 4-1        Summary of 24-hour and 1-hour TSP Monitoring Results at ASR-1

Table 5-1        Summary of Construction Noise Monitoring Results, dB(A)

Table 6-1        Summary of Water Quality Monitoring Results ¡V M3

Table 6-2        Action and Limit (A/L) Levels Exceedance Record

Table 6-3        Summary of Investigation Finding of Water Quality Exceedance in the Reporting Period

Table 7-1        Action and Limit Levels for Wet Woodland Habitats Monitoring

Table 7-2        Action and Limit Levels for Non-Wet Woodland Habitats Monitoring

Table 7-3        Schedule of Faunal Surveys in each year During Construction Phase

Table 7-4        Result of Avifauna Survey

Table 7-5        Result of Reptile Survey

Table 7-6        Result of Amphibian Survey

Table 7-7        Result of Butterfly Survey

Table 7-8        Result of Odonate Survey 

Table 7-9        Result of Freshwater Communities Survey

Table 9-1        Summary of Quantities of Inert C&D Materials

Table 9-2        Summary of Quantities of C&D Wastes

Table 10-1      Site Observations for the Works of Contract 1

Table 11-1      Statistical Summary of Environmental Complaints

Table 11-2      Statistical Summary of Environmental Summons

Table 11-3      Statistical Summary of Environmental Prosecution

Table 12-1      Environmental Mitigation Measures

 

 


List of Appendices

Appendix A    Layout Plan of the Project

Appendix B    Organization Structure and Contact Details of Relevant Parties

Appendix C   Three Months rolling Programme

Appendix D    Designated Monitoring Locations as Recommended in the Approved EM&A Manual

Appendix E    Calibration Certificates of MONITORING EQUIPMENT and Laboratory Certificate

Appendix F    Event and Action Plan of Air Quality, Noise and Water Quality

Appendix G    Monitoring Schedules of the Reporting Month and Coming Month

Appendix H    Monitoring Data of 24-Hour TSP Air Quality, Noise and Water Quality

Appendix I     Graphical Plots of Air Quality, Noise and Water Quality

Appendix J     Meteorological Data of the Reporting Period

Appendix K    Ecology Survey Report

Appendix L    Landscape & Visual Inspection Checklist

Appendix M   Monthly Summary Waste Flow Table

Appendix N    Implementation Schedule for Environmental Mitigation Measures (ISEMM)

 

 


1                    Introduction

1.1              Project Background

1.1.1        Civil Engineering and Development Department is the Project Proponent for the Project ¡§Site Formation and Associated Infrastructural Works for Development of Columbarium, Crematorium and Related Facilities at Sandy Ridge Cemetery¡¨ (hereafter referred as ¡§the Project¡¨). The Project is a Designated Project to be implemented under Environmental Permit No. EP-534/2017.  The layout plan of the Project is shown in Appendix A.  To facilitate the Project management, the Project works were separated into three different Contracts which are described below sub-sections.

 

1.1.2        Contract No. CV/2016/10 - Site Formation and Associated Infrastructural Works for Development of Columbarium at Sandy Ridge Cemetery (hereafter referred as ¡§Contract 1¡¨):-

Ÿ   Site formation of about 1.77 ha of land for the proposed pick-up and drop-off area for shuttle bus operation;

Ÿ   Upgrading of a section of 900m existing Sha Ling Road from 3m wide carriageway to 7.3m wide carriageway with footpath at both sides;

Ÿ   Construction of one EVA with a total length of about 160m;

Ÿ   Construction of noise barriers along Sha Ling Road;

Ÿ   Modification of junction between Man Kam To Road and Sha Ling Road;

Ÿ   Construction of a new pick up / drop off point at Man Kam To Road;

Ÿ   Relocation and construction of a new refuse collection point near junction between Man Kam To Road and Sha Ling Road;

Ÿ   Associated geotechnical works including cut and fill slopes, soil nailing works and retaining structures;

Ÿ   Associated drainage, sewerage and waterworks along Sha Ling Road; and

Ÿ   Associated landscaping works.

 

1.1.3        Contract No. CV/2017/02 - Infrastructural Works at Man Kam To Road and Lin Ma Hang Road for Development of Columbarium at Sandy Ridge Cemetery (hereafter referred as ¡§Contract 2¡¨):-

Ÿ   Construction of a new road connecting Columbarium site to Crematorium site;

Ÿ   Construction of one EVA with a total length of about 300m;

Ÿ   Widening of a section of 1.4 km long Lin Ma Hang Road (between Man Kam To Road and Ping Yuen River) from 6m wide carriageway to 7.3m with 2m width footpath on both sides;

Ÿ   Provision of a pair of lay-by at Lin Ma Hang Road;

Ÿ   Construction of a new vehicular access connecting the Sheung Shui Landmark North PTI and Lung Sum Avenue;

Ÿ   Construction of covered walkway along Fanling Station Road;

Ÿ   Removal of planters and central divider along Fanling Station Road and San Wan Road;

Ÿ   Associated drainage, sewerage, waterworks and utility works along Man Kam To Road and Lin Ma Hang Road;

Ÿ   Associated geotechnical works including cut and fill slopes, soil nailing works and retaining structures; and

Ÿ   Associated landscaping works.

 

1.1.4        CEDD Contract No. (to be advised) (hereafter referred as ¡§Contract 3¡¨):-

Ÿ   Site Formation for the platform of the columbarium site;

Ÿ   Construction of two 2 at-grade access roads;

Ÿ   Construction of road junction between Man Kam To Road and the new access road;

Ÿ   Associated drainage, sewerage and waterworks along the two new access roads;

Ÿ   Associated geotechnical works including cut and fill slopes, soil nailing works and retaining structures; and

Ÿ   Associated landscaping works

 

1.1.5        Hsin Chong Tsun Yip Joint Venture (hereinafter ¡§HCTYJV¡¨) has been awarded the Works Contract 1 on 5 December 2017.  According to the Contract requirement, HCTYJV shall take over the responsibility for part of Environmental Permit No. EP-534/2017 for ease of management, therefore application for Further Environmental Permit was submitted by HCTYJV to EPD on 26 January 2018 and Further Environmental Permit No. FEP-01/534/2017 was granted to HCTYJV by EPD on 23 February 2018.  Major works to be executed under the Project shall include to the following:

 

A Designated Works under EP-534/2017

(i)        Site formation of about 8 hectares of land and associated drainage, sewerage and landscape works for development of Columbarium and Crematorium facilities at the Sandy Ridge Cemetery;

(ii)      Construction of a new road (about 600m) including a section of viaduct connecting the platform for Crematorium and Man Kam To Road and the pick-up/drop-off point at Man Kam To Road.;

(iii)    Widening of about 900m of the existing Sha Ling Road;

(iv)    Widening of about 1.4km of the existing Lin Ma Hang Road; and

(v)      Improvement works to the existing barging point at Siu Lam

Non-Designated Works

(i)        Construction of a sewage detention tank complete with odour and septicity control mechanism;

(ii)      Construction of noise barriers along Sha Ling Road;

(iii)    Construction of a new Refuse Collection Point (RCP) near the junction between Man Kam To Road and Sha Ling Road;

(iv)    Landscaping works (including both hard and soft landscape works);

(v)      Associated tree felling, transplanting and compensatory planting works;

(vi)    Associated street lighting, street furniture and road marking, etc.; and

(vii)  Other works which are specified in PS of the Contract.

 

1.1.6        Action-United Environmental Services & Consulting has been commissioned by HCTYJV as an Environmental Team to implement the EM&A programme in accordance with the approved EM&A Manual as well as the associated duties.  As part of the EM&A programme, baseline monitoring to determine the ambient environmental conditions was completed before construction work commencement.  The Baseline Monitoring Report (air, noise and water) certified by Environmental Team Leader (ETL) and verified by Independent Environmental Checker (IEC) was submitted to Environmental Protection Department (EPD) and it was approved by EPD on 25 October 2018.

 

1.1.7        This is the 3rd monthly Environmental Monitoring and Audit Report to reporting the monitoring results and inspection findings for the period from 1 to 31 October 2018.

 

1.2              Report Structure

1.2.1        The Monthly Environmental Monitoring and Audit (EM&A) Report is structured into the following sections:-

Section 1       Introduction

Section 2       Project Organization and Construction Progress

Section 3       Summary of Monitoring Requirements

Section 4       Air Quality Monitoring Results

Section 5       Noise Monitoring Results

Section 6       Water Quality Monitoring Results

Section 7       Ecology Monitoring Results

Section 8       Landscape & Visual

Section 9       Waste Management

Section 10     Site Inspections

Section 11     Environmental Complaints and Non-Compliance

Section 12     Implementation Status of Mitigation Measures

Section 13     Conclusions and Recommendation

 

 


2                    Organization and Construction progress of the Works Contract-1

2.1              Works Contract-1 Organization and Management Structure

2.1.1        Organization structure and contact details of relevant parties with respect to on-site environmental management are shown in Appendix B.

 

2.2              Construction Progress

2.1.2        The three month rolling construction programme are enclosed in Appendix C and the major construction activities undertaken in this Reporting Month are listed below:-

l   General site clearance;

l   Bulk Excavation

l   Construction of temporary Site Office;

l   Construction of Cut Slope, installation of soil nailing and construction of surface channel;

l   Construction of retaining wall; and

l   Construction of fill slope.

 

2.3              Summary of Environmental Submissions

2.1.3        Summary of the relevant permits, licences, and/or notifications on environmental protection for this Project in this Reporting Month is presented in Table 2-1.

Table 2-1         Status of Environmental Licenses and Permits

Item

Description

License/ Permit ref no.

License/ Permit  Status

1

Air Pollution Control (Construction Dust) Regulation

Ref. no. 428909

Acknowledged by EPD on 20/12/2017

Valid

2

Chemical waste Producer Registration

WPN: 5231-641-H3937-01

Issued by EPD on 27/03/2018

Valid

3

Water Pollution Control Ordinance

License no. WT00030795-2018

Issued date: 9/5/2018

Expire Date: 31/5/2023

Valid

4

Billing Account for Disposal of Construction Waste

Account no.: 7029769

Date approved: NA

Valid

5

Construction Noise Permit

GW-RN0490-18

Issued date: 14/9/2018

Expire Date: 18/11/2018

Valid

 

2.4              Summary of Submission Under the Environmental Permit Requirements

2.1.4        Table 2-2 summarized the submission status under the EP and/or FEP stipulation in the Reporting Month.

Table 2-2         Status of Submission as under EP and/or FEP Stipulation

Item

EP and / or FEP Stipulation

Description

Situation

1

Condition 2.10 of the EP and FEP

Management organization of : i) the main construction companies; ii) ET; and iii) IEC and the supporting team

Submitted on 11 April 2018

2

Condition 2.11 of the EP and FEP

i) Detailed phasing programme of all construction works; and ii) Location plan of all construction works

Submitted on 12 April 2018

3

Condition 2.13 of EP and Condition 2.12 of FEP

Contamination Assessment Plan (CAP)

Submitted on 11 Oct 2018

4

Condition 2.14 of EP and Condition 2.13 of FEP

Grassland Reinstatement Plan

Submitted on 28 May 2018

5

Condition 2.15 of EP and Condition 2.14 of FEP

Vegetation Survey Report

Approved by EPD on 12 Oct 2018

6

Condition 2.16 of EP and Condition 2.15 of FEP

Vegetation Transplantation Proposal

Approved by EPD on 12 Oct 2018

7

Condition 2.18 of EP and Condition 2.17 of FEP

Woodland Compensation Plan

Submitted on 15 May 2018

8

Condition 2.19 of EP and Condition 2.18 of FEP

Monitoring and Survey Plan for Golden-headed Cisticola

Submitted on 9 May 2018

9

Condition 2.22 of EP and Condition 2.20 of FEP

Landscape & Visual Mitigation and Tree Preservation Plan(s)

Submitted on 18 May 2018

10

Condition 2.24 of EP and Condition 2.22 of FEP

Traffic Noise Mitigation Plan

Submitted on 17 July 2018

11

Condition 3.3 of the EP and FEP

Baseline Monitoring Report (Air, Noise and Water)

Approved by EPD on 25 Oct 2018

12

Condition 4.2 of the EP and FEP

The Contract Internet website

Internet website address has notified EPD on 15 Jun 2018

 

 

 


3                    Summary of Impact Monitoring Requirement

3.1              General

3.1.1        The Environmental Monitoring and Audit requirements are set out in the Approved EM&A Manual. Environmental issues such as air quality, construction noise, water quality and ecology were identified as the key issues during the construction phase of the Project.

 

3.1.2        A summary of construction phase EM&A requirements are presented in the sub-sections below.

 

3.2              Monitoring Parameters

3.2.1        The EM&A impact monitoring shall cover the following environmental aspect:

            Air quality;

            Construction noise;

            Water quality; and

            Ecology

 

3.2.2        A summary of the monitoring parameters is presented in Table 3-1 below

Table 3-1         Summary of EM&A Requirements

Environmental Issue

Parameters

Air Quality

Ÿ  1-hour TSP;

Ÿ  24-hour TSP

Noise

Ÿ  Leq(30min) during normal working hours.; and

Ÿ  Leq(15min) during the construction works is undertaken in Restricted Hours

Water Quality

In-situ Measurements

Ÿ  Dissolved Oxygen Concentration (mg/L) & Saturation (% );

Ÿ  Temperature (¢J);

Ÿ  Turbidity (NTU);

Ÿ  Salinity (ppm)

Ÿ  pH unit;

Ÿ  Water depth (m); and

Ÿ  Stream Flow Velocity (m/sec).

Laboratory Analysis

Ÿ  Suspended Solids (mg/L)

Ecology

 Ecologically sensitive habitats (wetland habitats and non-wetland habitats)

 

3.3              Monitoring Locations

3.3.1        According to the Approved EM&A Manual of the Project - Site Formation and Associated Infrastructural Works for Development of Columbarium, Crematorium and Related Facilities at Sandy Ridge Cemetery, the designated monitoring locations for air quality, noise, water quality and ecology under the monitoring programme, is shown in Appendix D.

 

3.3.2        Since the Project was divided into three Works Contracts and all Contracts will be commenced at different time, the construction phase impact monitoring will only be performed at the Contract-related monitoring stations upon commencement of each Contract Works.

 

Air Quality

3.3.3        There were three (3) air quality monitoring stations / air quality sensitive receivers (ASR) recommended in the Approved EM&A Manual Section 5.6.1.1.  The designated air quality monitoring locations were listed in Table 3-2 and illustrated in Appendix D.

Table 3-2        Designated Air Quality Monitoring Location under the Project

Location ID

ASR ID in EIA

Description

Location

ASR-1

A1

Village House along Man Kam To Road

Sha Ling Village House No.6

ASR-2

A2

Village House at San Uk Ling

San Uk Ling Village House No.1

ASR-3

A3

Village House at Muk Wu Nga Yiu

Muk Wu Nga Yiu House No.28

 

3.3.4        Based on rationale in Section 3.3.2, the Contract-related air quality monitoring location under construction phase of Contract 1 is shown in Table 3-3.

Table 3-3        Air Quality Monitoring Location as Related the Works Contract-1

Location ID

ASR ID in EIA

Description

Location

ASR-1

A1

Village House along Man Kam To Road

Sha Ling Village House No.6

 

3.3.5        If the designated monitoring location is required to relocate, alternative monitoring location shall meet the following criteria:

i)               Be at the site boundary or such locations close to the major dust emission source;

ii)             Close to the sensitive receptors;

iii)           Take into account the prevailing meteorological conditions;

iv)           For monitoring location located in the vicinity of the ASRs, care shall be taken to cause minimal disturbance to the occupants during monitoring.

v)             When positioning the HVS, the following points shall be noted:

a.         a horizontal platform with appropriate support to secure the samples against gusty wind shall be provided;

b.        no two samplers shall be placed less than 2m apart;

c.         the distance between the HVS and an obstacle, such as buildings, must be at least twice the height that the obstacle protrudes above the HVS;

d.        a minimum of 2 m separation from walls, parapets and penthouses is required for HVS at the rooftop;

e.         a minimum of 2 m separation from any supporting structure, measures horizontally is required;

f.         no furnace or incinerator flue is nearby;

g.         airflow around the sampler is unrestricted;

h.        the HVS is more than 20 m from the dripline;

i.          any wire fence and gate to protect the HVS, shall not cause any obstruction during monitoring;

j.          permission must be obtained to set up the HVS and to obtain access to the monitoring stations; and

k.        a secured supply of electricity is needed to operate the HVS.

 

3.3.6        Alternative monitoring location shall agree with IEC and seek for EPD approval.

 

Construction Noise

3.3.7        There were are four (4) noise monitoring locations / noise sensitive receivers (NSR) recommended in the Approved EM&A Manual Section 6.5.1.1.  Site visits were conducted by the Contractor and ET on 6th & 10th April 2018 to review and study sensitive receivers at surrounding and adjacent to the Project.  Four designated noise monitoring locations recommended in the Approved EM&A Manual were identified during the site visits. They were listed in Table 3-4 and shown in Appendix D.

Table 3-4        Designated Construction Noise Monitoring Location under the Project

Location ID

NSR ID in EIA

Description

Location

CN-1

N5-2

Village house to the west of Sha Ling Road

Village house to the west of Sha Ling Road (free field condition)

CN-2

N9-1

Village house to the north of Man Kam To Road

Sha Ling Village House No. 25 (free field condition)

CN-3

N18-5

Village house near San Uk Ling

San Uk Ling Village House No. 18 (free field condition)

CN-4

N21-4

Village house of Muk Wu

Muk Wu Village House No. 267 (1m façade from the building)

 

3.3.8        Based on rationale in Section 3.3.2, the Contract-related noise monitoring location under construction phase of Contract 1 is listed in Table 3-5.

Table 3-5        Noise Monitoring Location as Related the Works Contract-1

Location ID

ASR ID in EIA

Description

Location

CN-1

N5-2

Village house to the west of Sha Ling Road

Village house to the west of Sha Ling Road (free field condition)

CN-2

N9-1

Village house to the north of Man Kam To Road

Sha Ling Village House No. 25 (free field condition)

 

Water Quality

3.3.9        There were four (4) water quality monitoring locations recommended in the Approved EM&A Manual Section 7.6.1.2.  The locations and coordinates of water quality monitoring were listed in Table 3-6 and illustrated in Appendix D.

Table 3-6        Designated Water Quality Monitoring Stations under the Project

Proposed Location ID

Co-ordinates

Description

North

East

M1

843 431

831 308

Midstream of Nam Hang Stream

M2

843 840

831 101

Downstream of Nam Hang Stream

M3

843 509

830 040

Wetland in the Conservation Area (CA) near Yuen Leng Chai

M4

843 997

831 783

Watercourse across Lin Ma Hang Road, running from east of San Uk Ling to Man Kam To Boundary Control Point

 

3.3.10    Based on rationale in Section 3.3.2, the Contract-related water quality monitoring station under construction phase of Contract 1 is listed in Table 3-7.

Table 3-7        Water Quality Monitoring Station as Related the Works Contract-1

Proposed Location ID

Co-ordinates

Description

North

East

M3

843 509

830 040

Wetland in the Conservation Area (CA) near Yuen Leng Chai

 

3.4              Monitoring Frequency and Period

3.4.1        The requirements of impact monitoring were stipulated in Sections 5.8.1.1, 6.7.1.1 and 7.8.1.4 of the approved EM&A Manual and presented as follows.

 

Air Quality Monitoring

3.4.2        Monitoring frequency for air quality impact monitoring is as follows:

Ÿ   1-Hour TSP

3 sets of 1-hour TSP monitoring shall be carried out once every six days during construction periods

Ÿ   24-Hour TSP

Once 24-hour TSP monitoring shall be carried out every six days during construction periods

 

Noise Monitoring

3.4.3        Noise impact monitoring shall be carried out once per week during construction periods.  The noise measurement for the time period between 0700 and 1900 hours shall be measured in terms of Leq (30 minutes) or 6 sets of Leq (5mins).

 

Water Quality Monitoring

3.4.4        The monitoring frequency shall be 3 days per week during construction phase and the interval between two sets of monitoring shall not be less than 36 hours.

 

3.5              Monitoring Equipment

3.5.1        The monitoring equipment using for the EM&A program as proposed by the ET shall be verified by the IEC.

 

Air Quality Monitoring

3.5.2        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), Appendix B.  If ET proposes to use a direct reading dust meter to measure 1-hour TSP levels, it shall submit sufficient information to IEC for approval.

 

3.5.3        The filter paper of 24-hour TSP measurement shall be determined by HOKLAS accredited laboratory.

 

3.5.4        All equipment used by ET for air quality monitoring is listed in Table 3-8.

Table 3-8         Air Quality Monitoring Equipment

Equipment

Model

24-Hr TSP

High Volume Air Sampler (HVAS)

TISCH High Volume Air Sampler, HVS Model TE-5170

Calibration Kit

TISCH Model TE-5025A

1-Hour TSP

Portable Dust Meter

Sibata LD-3 Laser Dust monitor Particle Mass Profiler & Counter

 

Wind Data Monitoring Equipment

3.5.5        According to the approved EM&A Manual, wind data monitoring equipment shall also be provided and set up for logging wind speed and wind direction near the dust monitoring locations.  The equipment installation location shall be proposed by the ET and agreed with the IEC.  For installation and operation of wind data monitoring equipment, the following points shall be observed:

1)             The wind sensors should be installed 10 m above ground so that they are clear of obstructions or turbulence caused by buildings.

2)             The wind data should be captured by a data logger. The data shall be downloaded for analysis at least once a month.

3)             The wind data monitoring equipment should be re-calibrated at least once every six months.

4)             Wind direction should be divided into 16 sectors of 22.5 degrees each.

 

3.5.6        ET has liaised with the premises owners/ landlords to grant the permission for the HVS installation.  However, they rejected to set up wind data monitoring equipment installation in their premises.

 

3.5.7        Under this situation, the ET proposed to obtain representative wind data from the Hong Kong Observatory Ta Kwu Ling Weather Station.  Ta Kwu Ling Station is located near the Project site which situated at the sea level above 15mPD and the wind data monitoring equipment is installed 10 m above the existing ground.

 

Noise Monitoring

3.5.8        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 before each noise monitoring event. Noise measurements should not be made in fog, rain, wind with a steady speed exceeding 5 m s-1 or wind with gusts exceeding 10 m s-1. 

 

3.5.9        Noise monitoring equipment used for impact monitoring is listed in Table 3-9.


Table 3-9         Noise Monitoring Equipment

Equipment

Model

Integrating Sound Level Meter

B&K Type 2238

Calibrator

B&K Type 4231

Portable Wind Speed Indicator

Testo Anemometer

 

3.5.10    Sound level meters listed above comply with the International Electrotechnical Commission Publications 651: 1979 (Type 1) and 804: 1985 (Type 1) specifications, as recommended in TM issued under the NCO.  

 

Water Quality Monitoring

3.5.11    Water quality parameters include dissolved oxygen, water temperature & depth, turbidity, salinity, pH and stream flow velocity shall be measured in-situ, and suspended solids shall be analyzed by a HOKLAS-accredited testing laboratory.

 

Dissolved Oxygen and Temperature Measurement

3.5.12    The dissolved oxygen (DO) measuring instruments should be portable and weatherproof. The equipment should also complete with cable and sensor, and DC power source. It should be capable of measuring:

       A DO level in the range of 0 ¡V 20 mg/L and 0 ¡V 200% saturation; and

       A temperature of 0 ¡V 45 degree Celsius.

 

3.5.13    The equipment should have a membrane electrode with automatic temperature compensation complete with a cable.

 

3.5.14    Should salinity compensation not be built-in to the DO equipment, in-situ salinity should be measured to calibrate the DO measuring instruments prior to each measurement.

 

Turbidity Measurement

3.5.15    The turbidity measuring instruments should be a portable and weatherproof with DC power source.  It should have a photoelectric sensor capable of measuring turbidity level between 0¡V1000 NTU (for example, Hach model 2100Q or an approved similar instrument).

 

Salinity Measurement

3.5.16    A portable salinometer capable of measuring salinity in the range of 0¡V40 parts per thousand (ppt) should be provided for measuring salinity of the water at each monitoring location.

 

pH Measurement

3.5.17    A portable pH meter capable of measuring a range between 0.0 and 14.0 should be provided to measure pH under the specified conditions accordingly to the APHA Standard Methods.

 

Water Depth Measurement

3.5.18    A portable, battery-operated echo sounder or an approved similar instrument should be used for water depths determination at each designated monitoring station.

 

Stream Flow Velocity Equipment

3.5.19    Since the EM&A Manuals do not specified instrument to use stream flow velocity measurement, the monitoring of stream flow velocity is therefore proposed to be conducted by using a flow probe which is a digital water velocity meter.

 

Water Sampling Equipment

3.5.20    A water sampler is required for suspended solid (SS) monitoring.  A water sampler e.g. Kahlsico Water Sampler, which is a transparent PVC cylinder with capacity not less than 2 litres, will be used for water sampling if water depth over than 0.5m.

 

3.5.21    For sampling from very shallow water depths e.g. <0.5 m, water sample will be collected from water surface below 100mm using plastic bottle to avoid inclusion of bottom sediment or humus.  Moreover, Teflon/stainless steel bailer or self-made sampling buckets maybe used for water sampling.  The equipment used for sampling will be depended the sampling location and depth situations.

 

Sample Containers and Storage

3.5.22    Water samples for suspended solid should be stored in high density polythene bottles with no preservative added, packed in ice (cooled to 4¢XC without being frozen) and delivered to the laboratory within 24 hours of collection and be analyzed as soon as possible after collection.

 

3.5.23    Analysis of suspended solids should be carried out in a HOKLAS or other accredited laboratory. Water samples of about 1L should be collected at the monitoring stations for carrying out the laboratory suspended solids determination.  The SS determination work should start within 24 hours after collection of the water samples. The SS analyses should follow the APHA Standard Methods 2540D with Limit of Reporting of 2 mg/L.

 

3.5.24    Details of the equipment used for water quality monitoring are listed in Table 3-10 below.

Table 3-10       Water Quality Monitoring Equipment

Equipment

Model

Water Depth Detector

Tape measures

Water Sampler

A 2-litre transparent PVC cylinder with latex cups at both ends or teflon/stainless steel bailer or self-made sampling bucket

Thermometer & DO meter

YSI 550A / YSI Pro 20

pH meter

AZ8685 pH meter

Turbidimeter

Hach 2100Q

Salinometer

Atago refractometer Atago S Salinity Meter / AZ8371 Salinity Meter

Stream Flow Velocity

FP211 Global Flow Probe

Sample Container

High density polythene bottles (provided by laboratory)

Storage Container

¡¥Willow¡¦ 33-litter plastic cool box with Ice pad

 

3.5.25    Furthermore, Suspended solids (SS) analysis was carried out by ALS Technichem (HK) Pty Ltd, he is one a local HOKLAS-accredited laboratory

 

3.6              Equipment Calibration

3.6.1        The HVAS is operated and calibrated on a regular basis in accordance with the manufacturer¡¦s instruction using Tisch Calibration Kit Model TE-5025A.  Calibration would carry out in two month interval.  The calibration data are properly documented and the records are maintained by ET for future reference.  Furthermore, Tisch Calibration Kit will be calibrated by the manufacturer in yearly basis.

 

3.6.2        The 1-hour TSP meter calibrated by a local HOKLAS-accredited laboratory would be undertaken in yearly basis.  Zero response of the equipment was checked before and after each monitoring event.

 

3.6.3        The sound level meter and acoustic calibrator are calibrated and certified by a laboratory accredited under HOKLAS or any other international accreditation scheme at yearly basis.

 

3.6.4        The multi-parameter Water Quality Monitoring System is calibrated by HOKLAS accredited laboratory of three month intervals.

 

3.6.5        All updated calibration certificates of the monitoring equipment used for the impact monitoring program in this Reporting Month are attached in Appendix E.

 

3.7              Data Management and Data QA/QC Control

3.7.1        The impact monitoring data are handled by the ET¡¦s systematic data recording and management, which complies with in-house Quality Management System. Standard Field Data Sheets (FDS) are used in the impact monitoring program.

 

3.7.2        The monitoring data recorded in the equipment e.g. 1-hour TSP meter, noise meter and Multi-parameter Water Quality Monitoring System are downloaded directly from the equipment at the end of each monitoring day.  The downloaded monitoring data are input into a computerized database properly maintained by the ET.  The laboratory results are input directly into the computerized database and QA/QC checked by personnel other than those who input the data.  For monitoring activities require laboratory analysis, the local laboratory follows the QA/QC requirements as set out under the HOKLAS scheme for all laboratory testing.

 

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

3.8.1        The baseline monitoring results form the basis for determining the environmental acceptance criteria for the impact monitoring. the air quality, construction noise and water quality criteria, namely Action and Limit levels were established according to Approved EM&A Manual, and they are listed in Tables 3-11, 3-12 and 3-13 below.

 

Table 3-11      Action and Limit Levels for Air Quality Monitoring

Monitoring Stations

Action Level (mg/m3)

Limit Level (mg/m3)

1-hour

24-hour

1-hour

24-hour

ASR-1

331

181

500

260

 

Table 3-12      Action and Limit Levels for Construction Noise

Time Period

Action Level

Limit Level

0700-1900 hours on normal weekdays

When one documented complaint is received

> 75* dB(A)

Note:      *   Reduces to 70 dB(A) for schools and 65 dB(A) during the school examination periods.

 

Table 3-13      Action and Limit Levels for Water Quality

Monitoring Location

DO (mg/L)

Turbidity (NTU)

SS (mg/L)

Action Level

Limit Level

Action Level

Limit Level

Action Level

Limit Level

M3

4.58

4.49

5.6

5.9

9.3

9.5

Notes:

      For DO, non-compliance of the water quality limits occurs when monitoring result is lower than the limits

      For turbidity and SS, non-compliance of the water quality limits occurs when monitoring result is higher than the limits.

 

3.8.2        Should non-compliance of the environmental quality criteria occurs, remedial actions will be triggered according to the Event and Action Plan enclosed in Appendix F.

 

 

 

 


4                    Air Quality

4.1              Monitoring Results

4.1.1        Air quality impact monitoring schedule was submitted to all relevant parties which shown in Appendix G.

 

4.1.2        In this Reporting Period, 6 occasions 24-hour TSP and 15 occasions 1-hour TSP of the air quality monitoring was undertaken at designated air quality monitoring location ASR-1.  The monitoring results for 24-hour and 1-hour TSP are summarized in Table 4-1.  The database of 24-hour TSP is shown in Appendix H and the graphical plots of 24-hour and 1-hour TSP result are shown in Appendix I.

Table 4-1        Summary of 24-hour and 1-hour TSP Monitoring Results at ASR-1

Date

24-hour TSP (mg/m3)

1-hour TSP (mg/m3)

Date

Start Time

1st hour measured

2nd hour measured

3rd hour measured

2-Oct-18

102

3-Oct-18

9:47

114

121

127

8-Oct-18

96

9-Oct-18

9:19

108

114

120

13-Oct-18

97

15-Oct-18

9:46

50

57

62

19-Oct-18

75

20-Oct-18

9:37

87

92

73

25-Oct-18

92

26-Oct-18

9:54

66

68

67

31-Oct-18

95

 

Average

(Range)

93

(75 - 102)

Average

(Range)

88

(50 ¡V 127)

 

4.1.3        The meteorological data during the impact monitoring days are summarized in Appendix J.

 

4.2              Air Monitoring Exceedance

4.2.1        As shown in Table 4-1, the monitoring results of 24-hour and 1-hour TSP monitoring in the Reporting Month were well below the Action Level.  No Notification of Exceedance (NOE) of air quality monitoring criteria was issued and therefore corrective action was not required.

 

 


5                    Construction Noise

5.1              Monitoring Results

5.1.1        Noise impact monitoring schedule was submitted to all relevant parties which shown in Appendix G.

 

5.1.2        In this Reporting Month, 4 occasions of noise monitoring were undertaken at designated noise monitoring location CN-1.  The sound level were set in a free field situation, and therefore a façade correction of +3dB(A) has been added according to acoustical principles and EPD guidelines.  Since the distance of current construction works of Contract 1 over 300m from CN-2, noise monitoring was not performed at that location in this Reporting Month.  The monitoring result of noise monitoring is show in Table 5-1 and the graphical plots are shown in Appendix I.

Table 5-1        Summary of Construction Noise Monitoring Results, dB(A) ¡V CN1

Date

Start Time

1st Leq5min

2nd Leq5min

3rd Leq5min

4th Leq5min

5th Leq5min

6th Leq5min

Leq30min

Corrected* Leq30min

3-Oct-18

9:50

61.8

62.7

61.5

61.8

62.7

60.7

62

65

9-Oct-18

9:16

69.8

72.5

68.2

70.2

67.3

69.4

70

73

15-Oct-18

9:43

67.1

67.1

64.5

61.7

65.5

62.9

65

68

26-Oct-18

10:00

60.0

65.7

67.5

68.3

66.7

70.8

68

71

Limit Level

-

 75

(*) A façade correction of +3dB(A) has been added according to acoustical principles and EPD guidelines.

 

5.1.3        Prior and after noise monitoring, the accuracy of the sound level meter has been checked by an acoustic calibrator to ensure the measurement within acceptance range of ¡Ó0.5dB.  Moreover, wind speed checked by portable wind speed meter has been performed before noise monitoring.  No noise measurement was performed in fog, rain, wind with a steady speed exceeding 5 m s-1 or wind with gusts exceeding 10 m s-1.  

 

5.2              Noise Monitoring Exceedance

5.2.1        As shown in Table 5-1, no noise monitoring results exceeded the Limit Level in the Reporting Month.  No Notification of Exceedance (NOE) of construction noise criterion was issued and no corrective action was therefore required.

 

 

 


6                    Water Quality

6.1              Monitoring Results

6.1.1        Water quality impact monitoring schedule was submitted to all relevant parties which shown in Appendix G.

 

6.1.2        In the Reporting Month, a total of 14 monitoring days were carried out at designated monitoring station M3 for water quality impact monitoring.  The monitoring result of key parameters including Dissolved Oxygen, Turbidity and Suspended Solids are summarized in Table 6-1.  Detailed monitoring results including in-situ measurements and laboratory analysis data are shown in Appendix H and graphical plots for monitoring result are shown in Appendix I.

Table 6-1         Summary of Water Quality Monitoring Results ¡V M3

Date

Parameters

DO (Averaged)

(mg/L)

Turbidity (Averaged)

(NTU)

Suspended Solids (Averaged)

(mg/L)

2-Oct-18

4.76

8.0

6.0

4-Oct-18

4.92

5.5

8.5

6-Oct-18

5.22

5.6

6.5

9-Oct-18

4.63

5.6

9.0

11-Oct-18

4.64

7.8

7.0

13-Oct-18

5.40

5.3

6.0

16-Oct-18

5.66

4.0

3.0

18-Oct-18

5.31

5.5

5.0

20-Oct-18

5.81

5.3

3.0

23-Oct-18

5.40

5.3

8.5

25-Oct-18

5.10

7.9

11.5

27-Oct-18

5.98

4.4

8.0

29-Oct-18

5.50

4.9

4.5

31-Oct-18

5.13

5.2

4.5

Remarks: bold and underline indicated Limit Level exceedance

 

6.1.3        During the Reporting Month, field measurements at M3 showed that temperature of stream water were within 23.0¢XC to 27.1¢XC, no salinity concentrations was detected, pH values within 6.7 to 8.7 and the stream flow velocity between 0.1 and 0.2 m/sec.

 

6.2              Water Quality Monitoring Exceedance

6.2.1        In this Reporting Period, a total of four (4) Limit Level exceedances, including three (3) Limit Level exceedances of turbidity and one (1) Limit Level exceedances of Suspended Solids were recorded at M3 they are summarized in Table 6-2. 

Table 6-2         Action and Limit (A/L) Levels Exceedance Record

Station

DO

Turbidity

SS

Total Exceedance

Project Related exceedance

Action

Limit

Action

Limit

Action

Limit

Action

Limit

Action

Limit

M3

0

0

0

3

0

1

0

4

0

0

 

6.2.2        Investigation for the cause of water quality exceedances have been undertaken by ET.  Investigation results revealed that water quality mitigation measures have been implemented to minimize the water quality impact arising from contract works.  Such as temporary bund and de-silting trench were installed at Retaining Wall RW1 to reduce the suspended solids content in runoff.  Series of sheet pile was installed at site boundary to prevent site runoff flowing to the Conservation Area (CA). Moreover, exposed surface were covered by tarpaulin sheet as far as practicable.  It was observed that construction of temporary drainage system was on-going and no muddy discharge was observed. In view of the implementation of water quality mitigation measures, the site was generally order and no water quality impact was observed, it is considered that the exceedances were unlikely caused by the works under the Project.  Since the exceedances were concluded as not project-related, increase of monitoring frequency is not required according to EM&A Manual 7.8.1.3.

6.2.3        Notifications of Exceedance (NOE) were issued to relevant parties upon confirmation of the monitoring result.  The exceedance investigation findings are summarized in Table 6-3. 

Table 6-3         Summary of Investigation Finding of Water Quality Exceedance in the Reporting Period

Date of Exceedance

Exceeded Parameter

Cause of Water Quality Exceedance In Brief

2 and 11 October 2018

NTU

In our investigation, HCTY-JV had implemented water quality mitigation measures. Having reviewed the monitoring data, there was no exceedance of Suspended Solids (SS) and the turbidity level is within the respective baseline range. In view of the implementation of water quality mitigation measures, the site was generally order and no water quality impact was observed, it is considered that the exceedances were unlikely caused by the works under the Project.

25 October 2018

NTU & SS

In our investigation, HCTY-JV had implemented water quality mitigation measures. In view of the implementation of water quality mitigation measures, the site was generally order and no water quality impact was observed, it is considered that the exceedances were unlikely caused by the works under the Project.

 

6.2.4        Although the exceedances were concluded not related the works under Contract 1, the Contractor was reminded to fully implement water quality mitigation measures such as exposed surface and area with low operation frequency should be covered by impervious sheeting.  Moreover, temporary drainage and collection system for site runoff should be fully accomplished as soon as possible which could highly reduce water quality impact to the surrounding watercourse and ecosystem.

 

 

 


7                    Ecology Monitoring

7.1              Requirement

7.1.1        According to approved EIA report (AEIAR-198/2016), habitat types within project boundary comprise of watercourse, grassland, upland grassland, plantation, woodland and developed area. Natural habitats were of moderate ecological value in terms of species diversity, species rarity, species abundance, ecological linkage as well as nursery. Moreover, 0.3ha of wet woodland on the northern side of Sandy Ridge was deemed habitat with high ecological value.  Four types of habitats were regarded as ecologically sensitive habitats, namely wet woodland, watercourses, upland grassland and woodland. Considering human disturbance in upcoming construction and operation phases, ecologically sensitive habitats shall be monitored in accordance with EM&A Manual.

 

7.1.2        The objective of ecologically sensitive habitats monitoring is to evaluate the effectiveness of measures to minimize impacts on concerned habitats from disturbance and pollution. In order to monitor the effectiveness of the measures to the minimize impact on ecologically sensitive habitats from disturbance and pollution, monthly monitoring during construction and operation phases is required as specified in EM&A Manual. Standard faunal transect and sampling surveys cover both wetland habitats (wet woodland and watercourse) and non-wetland habitats (upland grassland and woodland).

 

7.2              Methodology

7.2.1        Wetland habitats include wet woodland and watercourses. Monitoring surveys using standardized quantitative methodology will conduct at fixed points.  For seasonal watercourse, the survey will be conducted whenever the habitat appears.  Measures to respond to decreases in numbers of aquatic fauna using the wetland habitats and Action/Limit levels to trigger these measures are detailed in Table 7-1.

Table 7-1         Action and Limit Levels for Wet Woodland Habitats Monitoring

Action Level

Response

Limit Level

Response

Reduction in taxa diversity by 30%

Investigate cause and if cause identified as related to the project instigate remedial action to remove or reduce source of disturbance.

Reduction in taxa diversity by 50%

Investigate cause and if cause identified as related to the project instigate remedial action.

Remarks: Action and Limit Levels and Responses to Evidence of Declines in Aquatic Fauna

 

7.2.2        Non-wetland habitats consist of upland grassland and woodland. Monthly quantitative surveys of non-aquatic fauna will be conducted using standard route transect counts.  Measures to respond to decreases in numbers of non-aquatic fauna using the non-wetland habitats and Action/Limit levels to trigger these measures are detailed in Table 7-2.

Table 7-2         Action and Limit Levels for Non-Wet Woodland Habitats Monitoring

Action Level

Response

Limit Level

Response

Reduction in species diversity by 30%

Investigate cause and if cause identified as related to the project instigate remedial action to remove or reduce source of disturbance.

Reduction in species diversity by 50%

Investigate cause and if cause identified as related to the project instigate remedial action.

Remarks: Action and Limit Levels and Responses to Evidence of Declines in Non-Aquatic Fauna

 

7.2.3        The ecological survey includes all taxa being investigated in accordance with EIA report.  Schedule of faunal surveys in each year during construction phase is presented in Table 7-3.


Table 7-3         Schedule of Faunal Surveys in each year During Construction Phase

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Mammals

Ö

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

Birds (day)

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

Birds (night)

 

 

 

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

 

 

Herpetofauna

 

 

 

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

 

 

Dragonflies

 

 

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

 

 

Butterflies

 

 

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

 

 

Aquatic fauna

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

¡Ô

 

Mammal Survey

7.2.4        Mammal surveys will be conducted along the proposed transects (shown in Appendix D of the survey report) during both daytime and night time periods. Along with direct observations, other field signs, such as scats and tracks, will be searched and recorded if present.

 

Bird Survey

7.2.5        Bird surveys will be conducted along the transects (shown in Appendix D of the survey report) during the surveys, species and their vocalizing individuals recorded will be enumerated and recorded according to the habitat(s) they are utilizing.

 

Herpetofauna Survey

7.2.6        Reptile and amphibian surveys will be conducted along transects (shown in Appendix D of the survey report) during surveys careful searches of appropriate microhabitats and refugia for reptiles and their vocalizing individuals will be undertaken and all reptiles observed will be identified and counted.

 

Dragonfly and Butterfly Survey

7.2.7        Dragonfly and Butterfly surveys will be conducted along transects (shown in Appendix D of the survey report) during surveys all dragonflies and Butterflies seen will be identified and counted as accurately as possible.

 

Aquatic Fauna Survey

7.2.8        Freshwater fishes and macro-invertebrates will be recorded by direct observation. All species trapped/recorded will be enumerated and identified (to the lowest taxonomic level possible), and the species of conservation importance photographed.

 

7.2.9        After each ecological monitoring survey, a monthly report of the survey result and data collected will be provided with reference to EM&A Manual. An annual analysis of data will be carried out in order to study if there is any significant reduction in taxa diversity and abundance.

 

7.3              Ecological Monitoring Survey Findings

7.3.1        In the Reporting Month, ecological monitoring was undertaken on 4th October 2018.  The weather of monitoring day was fine.  The monitoring survey was included day and night sections, covering wetland and non-wetland areas.  The survey was conducted by transect and fixed points.  All species seen will be identified and counted as accurately as possible.  Results of the monitoring survey are presented below:

 

Mammal

7.3.2        There was no mammal recorded in the monitoring area

 

Birds

7.3.3        There were a total of 32 bird individuals from 10 species recorded during the survey.

 

Herpetofauna

7.3.4        There were no reptiles recorded in the monitoring area. There was two amphibian (Kaloula pulchra ,Asiatic Painted Frog, ªá¯U¤fµì) and Microhyla fissipes, Ornate Pigmy Frog, ¹¢¯¾®Vµì) found in the monitoring area.

 

Dragonfly

7.3.5        There were a total of 13 odonate individuals from 2 species.

 

Butterfly

7.3.6        There were a total of 3 butterfly individuals from 3 species recorded.

 

Aquatic Fauna Survey (Freshwater communities)

7.3.7        2 crabs of conservation importance Somanniathelphusa zanklon (ÅI¤M§ô¸yÃÉ) were found in marsh.

 

7.3.8        The summaries of faunal survey result are shown in Tables 7-4, 7-5, 7-6, 7-8 and 7-9. 

Table 7-4         Result of Avifauna Survey

Scientific Name

English Name

Chinese Name

Conservation Status

Non-

wetland

Wetland

Apus nipalensis

House Swift

¤p¥Õ¸y«B¿P

 

15

 

Lanius schach

Long-tailed Shrike

´Ä­I§B³Ò

 

 

1

Dicrurus macrocercus

Black Drongo

¶Â¨÷§À

 

1

 

Corvus macrorhynchos

Large-billed Crow

¤j¼L¯Q¾~

 

2

 

Pycnonotus jocosus

Red-whiskered Bulbul

¬õ¦Õóí

 

2

 

Pycnonotus aurigaster

Sooty-headed Bulbul

¥Õ³ï¬õÁvóí

 

2

 

Prinia inornata

Plain Prinia

¯Â¦âøkÅa

 

 

1

Garrulax chinensis

Black-throated Laughingthrush

¶Â³ï¾¸

 

 

2

Zosterops japonicus

Japanese White-eye

·tºñ¸²´³¾

 

4

 

Gracupica nigricollis

Black-collared Starling

¶Â»âÙʳ¾

 

 

2

 

Table 7-5         Result of Reptile Survey

Scientific Name

Common Name

Chinese Name

Non-wetland

Wetland

--

--

--

--

--

 

Table 7-6         Result of Amphibian Survey

Scientific Name

Common Name

Chinese Name

Conservation Status

Non-

wetland

Wetland

Kaloula pulchra

Asiatic Painted Frog, Piebald Digging Frog

ªá¯U¤fµì

 

 

 

1

Microhyla fissipes

Ornate Pigmy Frog, Ornate Ricefrog, Ornamented Pygmy Frog

¹¢¯¾®Vµì

 

 

1

 

 

Table 7-7         Result of Butterfly Survey

Scientific Name

Common Name

Chinese Name

Non-

wetland

Wetland

Parnara guttata

Common Straight Swift

ª½¯¾½_§Ë½º

1

 

Rapala manea

Slate Flash

¿P¦Ç½º

1

 

Abisara echerius

Plum Judy

³D¥Ø½Å¸Ã½º

 

1

 

Table 7-8         Result of Odonate Survey

Scientific Name

Common Name

Chinese Name

Conservation Status

Non-

wetland

Wetland

Ceriagrion auranticum

Orange-tailed Sprite

¯[²y¾ï¶Àîe

 

 

1

 

Pantala flavescens

Wandering Glider

¶À»f

 

12

 

 

Table 7-9         Result of Freshwater Communities Survey

Scientific Name

Common Name

Chinese Name

Conservation Status

4-Oct-18

Somanniathelphusa zanklon

 

ÅI¤M§ô¸yÃÉ

Fellowes et al. (2002): GC

2

 

7.3.9        The detailed survey report is attached in Appendix K.

 

7.3.10    The tentative ecology inspection and monitoring in the next reporting period (November 2018) is scheduled on 15th November 2018.

 

 


8                    Landscape and Visual

8.1              Requirement

8.1.1        The EIA has recommended EM&A for landscape and visual resources to be undertaken during the design, construction and operational stages of the project. The design, implementation and maintenance of landscape mitigation measures is a key aspect of this and should be checked to ensure that they are fully realized and that potential conflicts between the proposed landscape measures and any other project works let its are resolved at the earliest possible date and without compromise to the intention of the mitigation measures. In addition, implementation of the mitigation measures recommended by the EIA will be monitored through the site audit programme.

 

8.1.2        A number of mitigation measures to ameliorate the landscape and visual impacts of the Project implementation is summarized in the EMIS of Appendix 13.1 of the EIA Report.

 

8.1.3        The landscape and visual mitigation measures proposed should be incorporated in the landscape and engineering design.  Mitigation measures to be implemented during construction should be adopted from the start of construction and be in place throughout the entire construction period.  Mitigation measures to be implemented during operation should be integrated into the detailed design and built as part of the construction works so that they are in place on commissioning of the Project.  Tree transplantation and compensatory planting should be carried out as early as possible in the Project with transplantation carried out prior to construction starting in any particular area.

 

8.1.4        During construction phase, Landscape & Visual Monitoring of the contractor¡¦s operations should be conducted monthly and reported by ET, and countersigned by IEC.

 

8.2              Findings / Deficiencies During Site Inspection in the Reporting Month

8.2.1        In the Reporting Period, landscape & Visual inspection was carried out by the Registered Landscape Architect (RLA) on 29 October 2018. The findings / reminders recorded during the inspection are presented below:

 

Date

Findings and Reminder

29 October 2018

1.          Construction works were being started. According to ¡¥Tree Preservation¡¦ No7/2015, 26a, Contractor was reminded to provide TPZ with proper and robust fence at the dripline of all retained trees. No works were allowed to undertake within the TPZ.

2.          Typhoon Mangkhut lead to fallen trees on site, contractor was reminded to remove these risk trees.

3.          Construction material was found placing next to the retained tree, the contractor is reminded to provide robust TPZ and do not place any construction material in it.

4.          Concrete leakage on the construction site was observed, contractor is reminded to keep the site clean and tidy.

5.          Raised soil level near root flare of tree was observed, as it may lead to suffocation of tree root, contractor is reminded to lower the soil level around the tree root flare.

 

8.2.2        Inspection checklist of Landscape & Visual signed by RLA is attached in Appendix L.

 


9                    Waste Management

9.1              General Waste Management

9.1.1        Waste management was carried out by an on-site Environmental Officer or an Environmental Supervisor from time to time in accordance with the Waste Management Plan (WMP).

 

9.2              Records of Waste Quantities

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

l   Construction & Demolition (C&D) Material;

l   Chemical Waste;

l   General Refuse; and

l   Excavated Soil.

 

9.2.2        The quantities of waste for disposal in this Reporting Period are summarized in Table 9-1 and 9-2 and the Monthly Summary Waste Flow Table is shown in Appendix M.  Whenever possible, materials were reused on-site as far as practicable.

Table 9-1         Summary of Quantities of Inert C&D Materials

Type of Waste

Quantity

Disposal Location

C&D Materials (Inert) (m3)

0

-

Reused in this Contract (Inert) (m3)

2.982

Within the Contract working site

Reused in other Projects (Inert) (m3)

0

-

Disposal as Public Fill (Inert) (m3)

43.881

Tuen Mun Area 38

 

Table 9-2        Summary of Quantities of C&D Wastes

Type of Waste

Quantity

Disposal Location

Recycled Metal (kg)

0

-

Recycled Paper / Cardboard Packing (kg)

0

-

Recycled Plastic (kg)

0

-

Chemical Wastes (kg)

0

-

General Refuses (m3)

0.298

NENT Landfill

 

9.2.3        Since canteen and/or kitchen are not allowed setting on the Project site, no domestic wastewater was generated from the Project.

 

 

 


10                Site Inspection

10.1          Requirement

10.1.1    According to the approved Environmental Monitoring and Audit Manual, environmental site inspection should be formulated by the ET Leader. Regular environmental site inspections shall be carried out to assess the environmental performance once per week.

 

10.2          Findings / Deficiencies During Site Inspection in the Reporting Month

10.2.1    In the Reporting Period, joint site inspections to evaluate the site environmental performance carried out by the RE, ET and the Contractor was on 4th, 11th, 19th, 25th and 31st October 2018.  Moreover, IEC attended a joint site inspection on 19th October 2018. No non-compliance was noted.

 

10.2.2    The findings / deficiencies that observed during the weekly site inspection are listed in Table 10-1.

Table 10-1      Site Observations for the Works of Contract-1

Date

Findings / Deficiencies

Follow-Up Status

4 October 2018

Ÿ The Contractor was reminded to spray water reguarly within site area for dust suppression.

Ÿ Not required for reminder.

11 October 2018

Ÿ Chemical container without drip tray was observed. The Contractor should place the chemical container into drip tray to avoid land contamination.

Ÿ Chemical container was removed to chemical storage area.

Ÿ NRMM label was not observed for the excavator. The Contractor should display the NRMM label according the the NRMM regulation.

Ÿ The Contractor was reminded to spray water regularly within site area and ensure dust mitigation measure for construction work such as slope drilling was properly implemented for dust suppression.

Ÿ The Contractor was reminded to provide sufficient amount of rubbish bin within site area for collecting general wastes.

Ÿ The Contractor was reminded to clean the stagnant water in drip tray under generator.

Ÿ The Contractor was reminded to provide drip tray for generator within site area.

Ÿ The Contractor was reminded to provide proper mitigation measure on open slope for dust suppression.

Ÿ NRMM label was displayed on excavator.

 

 

Ÿ Not required for reminder.

 

 

 

Ÿ Not required for reminder.

 

 

Ÿ Not required for reminder.

 

Ÿ Not required for reminder.

 

Ÿ Not required for reminder.

 

19 October 2018

Ÿ Chemical containers were observed on the ground at work area of retaining wall. The Contractor should provide drip tray chemical containers to avoid oil leakage.

Ÿ Drip tray was provided for the chemical containers.

25 October 2018

Ÿ Chemical containers were observed on the ground at CS11. The Contractor should provide drip tray to chemical containers to avoid land contamination.

Ÿ The Contractor was reminded to dispose the empty cement bag properly to reduce dust impact.

Ÿ The Contractor was reminded to maintain good housekeeping on site.

Ÿ Drip tray was provided for the chemical containers.

 

Ÿ Not required for reminder.

 

 

Ÿ Not required for reminder.

 

31 October 2018

Ÿ Chemical containers were observed near site entrance. The Contractor should provide drip tray to chemical containers to avoid land contamination.

Ÿ The Contractor was reminded to dispose the empty cement bag properly to reduce dust impact.

Ÿ The Contractor was reminded to maintain good housekeeping on site.

Ÿ Drip tray was provided for the chemical containers.

 

Ÿ Not required for reminder.

 

 

Ÿ Not required for reminder.

 

10.2.3    The Contractor is reminded to cover the open slope as far as practicable to reduce turbid runoff generated during rainy days and ensure all site runoff are properly diverted and treated prior to discharge.  Moreover, all temporary catch pits shall be maintained in good condition in order to reduce water impact during heavy rainfall.

 

10.2.4    Moreover, removal of stagnant water within site areas should be conducted after rain to prevent mosquito breeding.  In addition, all retained trees within site area shall be properly protected by mean of tree protection zone to avoid damage from work.

 

 


11                Environmental Complaint and Non-Compliance

11.1          Environmental Complaint, Summons and Prosecution

11.1.1    In the Reporting Period, no environmental complaint was received.  No summons and prosecution was lodged for the Contract.  The statistical summary table of the environmental complaint, summons and prosecution are presented in Tables 11-1, 11-2 and 11-3.

Table 11-1       Statistical Summary of Environmental Complaints

Reporting Period

Environmental Complaint Statistics

Frequency

Cumulative

Complaint Nature

1 ¡V 31 October 2018

0

0

NA

 

Table 11-2       Statistical Summary of Environmental Summons

Reporting Period

Environmental Summons Statistics

Frequency

Cumulative

Complaint Nature

1 ¡V 31 October 2018

0

0

NA

 

Table 11-3       Statistical Summary of Environmental Prosecution

Reporting Period

Environmental Prosecution Statistics

Frequency

Cumulative

Complaint Nature

1 ¡V 31 October 2018

0

0

NA

 

11.1.2    In addition, no complaints received and emergency events relating to violation of environmental legislation for illegal dumping and landfilling were received.

 


12                Implementation Status of Mitigation Measures

12.1          General Requirements

12.1.1    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 N.

 

12.1.2    The Works of Contract 1 under the Project shall be implementing the required environmental mitigation measures according to the approved EM&A Manual subject to the site condition.  Environmental mitigation measures implemented in this Reporting Month is summarized in Table 12-1.

Table 12-1       Environmental Mitigation Measures

Issues

Environmental Mitigation Measures

Water Quality

¡P       Provided efficient silt removal facilities to reduce SS level before effluent discharge.

¡P       Provided ditches, earth bunds or sand bag barriers to minimize polluted runoff.

¡P       Temporary drainage was provided to prevent runoff going through site surface and minimize polluted runoff.

¡P       Provided perimeter cut-off drains at site boundaries to intercept storm runoff from crossing the site.

¡P       Exposed slopes surface were compacted and covered with tarpaulin or similar means

¡P       Provided portable chemical toilets on site.

Air Quality

¡P       Maintain damp / wet surface on access road.

¡P       Maintain low vehicular speed within the works areas.

¡P       Provided vehicle wheel washing facilities at each construction site exit;

¡P       Provided water spraying for all active works area.

¡P       Stockpiles of dusty material were covered with impervious sheeting.

¡P       Provided workers to clear dusty materials at the vehicle entrance or exit regularly.

¡P       Stockpile more than 20 bags of cement or dry pulverized fuel ash (PFA) has been covered entirely by impervious sheeting or placed in an area sheltered on the top and the 3 sides.

Noise

¡P       Restricted operation time of plants from 07:00 to 19:00 on any working day except for Public Holiday and Sunday.

¡P       Keep good maintenance of plants

¡P       Placed noisy plants away from residence and school

¡P       Provided noise barriers or hoarding to enclose the noisy plants or works

¡P       Shut down the plants when not in used.

Waste and Chemical Management

¡P       Provided on-site sorting prior to disposal

¡P       Followed requirements and procedures of the ¡§Trip-ticket System¡¨

¡P       Predicted required quantity of concrete accurately

¡P       Collected the unused fresh concrete at designated locations in the sites for subsequent disposal

General

¡P       The site was generally kept tidy and clean.

 

12.2          Tentative Construction Activities in the Coming Month

12.2.1    According to the information provided by HCTYJV, the forthcoming construction activities for Contract 1 are listed below:

(i)            General Site Clearance

(ii)          Bulk Excavation

(iii)        Construction of Temporary Site Office

(iv)        Construction of Cut Slope, installation of soil nailing and construction of surface channel.

(v)          Construction of retaining wall

(vi)        Construction of fill slope

 

12.3          Key Issues for the Coming Month

12.3.1    Key issues to be considered in the coming month for the works of Contract 1 include:

Ÿ   Implementation of control measures for rainstorm;

Ÿ   Regular clearance of stagnant water during wet season;

Ÿ   Implementation of dust suppression measures at all times;

Ÿ   Potential wastewater quality impact due to surface runoff;

Ÿ   Potential fugitive dust quality impact due from the dry/loose/exposure soil surface/dusty material;

Ÿ   Ensure dust suppression measures are implemented properly;

Ÿ   Sediment catch-pits and silt removal facilities should be regularly maintained;

Ÿ   Discharge of site effluent to the nearby wetland is prohibited;

Ÿ   Nearby wetland prohibited stockpiling and/or disposal of materials;

Ÿ   Follow-up of improvement on general waste management issues; and

Ÿ   Implementation of construction noise preventative control measures.

 

 

 


13                Conclusions and Recommentations

13.1          Conclusions

13.1.1    This is the 3rd monthly Environmental Monitoring and Audit Report presenting the monitoring results and inspection findings for the period of 1 to 31 October 2018.

 

13.1.2    No 24-hour or 1-hour TSP monitoring result that triggered the Action or Limit Levels was recorded.  No NOEs or the associated corrective action was therefore required.

 

13.1.3    No noise complaint (which is an Action Level exceedance) was received and no construction noise measurement result that exceeded the Limit Level was recorded in this Reporting Month.  No NOEs or the associated corrective actions were therefore issued.

 

13.1.4    For water quality monitoring, a total of 4 Limit Level (LL) exceedances, including 3 LL exceedance of turbidity and 1 LL exceedances of SS were recorded at designated monitoring location M3.   Investigation results revealed that water quality mitigation measures have been implemented to minimize the water quality impact arising from contract works.  Such as temporary bund and de-silting trench were installed at Retaining Wall RW1 to reduce the suspended solids content in runoff.  Series of sheet pile was installed at site boundary to prevent site runoff flowing to the Conservation Area (CA).  In view of the implementation of water quality mitigation measures, the site was generally order and no water quality impact was observed, it is considered that the exceedances were unlikely caused by the works under the Project.

 

13.1.5    Monthly ecological monitoring for sensitive habitat is undertaken on 4th October 2018.  Moreover, Landscape and visual inspection was undertaken by the RLA on 29th October 2018.

 

13.1.6    In the Reporting Period, no environmental complaint, summons and prosecution was received.  In addition, no complaints received and emergency events relating to violation of environmental legislation for illegal dumping and landfilling were received.

 

13.1.7    In the Reporting Period, joint site inspections to evaluate the site environmental performance were carried out by the RE, ET and the Contractor on 4th, 11th, 19th, 25th and 31st October 2018 and IEC attended joint site inspection on 19th October 2018.  No non-compliance of environmental issue was recorded.  In general, it was reminded that water quality mitigation measures should be fully implemented and good housekeeping practice should be maintained. 

 

13.2          Recommendations

13.2.1    The Contractors should pay special attention on water quality mitigation measures and fully implement according to the ISEMM of the EM&A Manual, in particular in rainy season to prevent surface runoff with high SS content and other pollutants from flowing to local steam and Conservation Area (CA).

 

13.2.2    Construction noise would be a key environmental issue during construction phase of the Project.  Noise mitigation measures such as using quiet plants and mobile noise barriers should be implemented in accordance with the EM&A requirement.

 

13.2.3    Since construction site under the Works of Contract 1 of the Project is located near villages, HCTYJV should fully implement air quality mitigation measures to reduce construction dust emission.

 

13.2.4    Furthermore, daily cleaning and weekly tidiness shall be properly performed and maintained. In addition, mosquito control should be performed to prevent mosquito breeding on site.