Job No.: TCS00874/16

 

 

 

 

 

 

 

 

 

CEDD Contract No. CV/2012/05

Development of a Bathing Beach at Lung Mei, Tai Po

 

 

 

 

 

 

 

 

 

1st Quarterly Environmental Monitoring and Audit Summary Report (December 2017 – February 2018)

 

 

 

 

 

 

 

 

 

 

Prepared For

 

 

 

 

Welcome Construction CO., Ltd

 

 

 

 

 

 

 

 

 

 

Date

Reference No.

Prepared By

Certified By

20 November 2019

TCS00874/16/600/R0177v2

 

Nicola Hon

(Environmental Consultant)

T.W. Tam

(Environmental Team Leader)

 

 

Version

Date

Remarks

1

27 June 2019

First Submission

2

20 November 2019

Amended against IEC’s comment

 

 

 

 


 

 

 

 

 

executive summary

ES.01     Civil Engineering and Development Department (hereafter referred as “CEDD”) is the Project Proponent and the Permit Holder of Agreement No. CE 59/2005 (EP) Development of a Bathing Beach at Lung Mei, Tai Po (hereinafter referred as “the Project”), which is a Designated Project to be implemented under Environmental Permit number EP-388/2010 (hereinafter referred as “the EP-388/2010” or “the EP”).

 

ES.02     Action-United Environmental Services & Consulting (hereinafter referred as “AUES”) has been commissioned as the Environmental Team for the Project (hereinafter referred as “the ET”) to perform relevant Environmental Monitoring and Audit (EM&A) programme, including baseline and impact environmental monitoring in accordance with the EM&A Manual approved under the Environmental Impact Assessment Ordinance (EIAO).

ES.03     The construction phase of the Project was commenced on 1st December 2017 and EM&A programme was commenced at the same day.  The marine work under the Project was commenced on 24th January 2018 subsequently.

ES.04     This is the 1st Quarterly EM&A report summarizing the monitoring results and inspection findings for the reporting period from 1 December 2017 to 28 February 2018 (hereinafter ‘the Reporting Period).  

 

Environmental Monitoring and Audit Activities

ES.05     Environmental monitoring activities under the EM&A program in the Reporting Period are summarized in the following table.

Issues

Environmental Monitoring Parameters / Inspection

Sessions Note 1

Air Quality

1-hour TSP

16

24-hour TSP

17

Construction Noise

LAeq(30min) Daytime

14

Water Quality

Marine Water Sampling

16

Inspection / Audit

ET Regular Environmental Site Inspection

6

IEC Monthly Environmental Site Audit

3

Note:  

1.)    Total sessions are counted by monitoring days.

2.)    The marine work under the Project was commenced on 24th January 2018

 

Breach of Action and Limit (A/L) Levels

ES.06     No air quality and construction noise monitoring exceedance was recorded in this Reporting Period. For water quality monitoring, fifteen (15) Action Level and seventy-one (71) Limit Level exceedances were recorded for Suspended Solids in the reporting period. NOEs were issued to notify EPD, AFCD, WSD, IEC, the Contractor and the Project Consultant. The statistics of environmental exceedance, NOE issued and investigation of exceedance are summarized in the following table.

Environmental Issues

Monitoring Parameters

Exceedance

Event & Action

Action Level

Limit Level

No. of NOE Issued

Investigation

Corrective Actions

Air Quality

1-hour TSP

0

0

0

-

-

24-hour TSP

0

0

0

-

-

Construction Noise

LAeq(30min)

0

0

0

-

-

Water Quality

DO

0

0

0

-

-

Turbidity

0

0

0

-

-

SS

15

71

8

Not project-related.

NA

Chlorophyll-a

0

0

0

-

-

Note:   NOE – Notification of Exceedance

 

ES.07     For Suspended Solid exceedances recorded in the reporting period, investigations were conducted and concluded that the exceedances were unlikely caused by the Project.  Nevertheless, the Contractor was reminded to check the implementation of silt curtain regularly to ensure no seepage of muddy water into the marine water body.

 

Environmental Complaint

ES.08     No environmental complaint was recorded or received in this Reporting Period. 

 

Notification of Summons and Successful Prosecutions

ES.09     No environmental summons or successful prosecutions were recorded in this Reporting Period. 

 

Reporting Change

ES.10     Since this is first quarterly EM&A report for the Project, no reporting change was therefore made.

 

Future Key Issues

ES.11     The forthcoming construction activities included tree transplanting, construction of groyne and construction of western box culvert. The potential environmental impacts arising from the forthcoming activities included construction waste, air quality, construction noise and water quality.

 

ES.12     In view of the marine work commencement, special attention should be paid on dredging works in which water quality mitigation measures such as erection of silt curtain should be properly implemented during the course of marine works.

 

ES.13     The Contractor was reminded that exposed slope should be covered and temporary drainage system should be maintained to prevent surface runoff entering the sea or public area.

 

ES.14     During dry season, the dust mitigation measures should be fully implemented such as water spraying during dust work to minimize dust impact as appropriate.  All dump trucks leaving the Site should be thoroughly washed by wheel washing facilities and provided with mechanical covers in good service condition.

 


 

 

 

Table of Contents

1.    Introduction   1

1.1            Project Background   1

1.2            Report Structure  1

2.    Project Organization and Construction Progress  3

2.1            Project Organization and Management Structure  3

2.2            Construction Progress  3

2.3            Summary of Environmental Submissions  3

3.    Summary of Impact Monitoring Requirements  4

3.1            General  4

3.2            Monitoring Parameters  4

3.3            Monitoring Locations  4

3.4            Monitoring Frequency and Period   6

3.5            Monitoring Instrument  7

3.6            Monitoring Procedures  8

3.7            Meteorological Information   11

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

3.9            Data Management and Data QA/QC Control  12

4.    Air Quality Monitoring   13

4.1            General  13

4.2            Results of Air Quality Monitoring   13

5.    Construction Noise Monitoring   14

5.1            General  14

5.2            Results of Noise Monitoring   14

6.    Water Quality Monitoring   15

6.1            General  15

6.2            Results of Water quality Monitoring   15

7.    Waste Management   17

7.1            General  17

7.2            Records of Waste Quantities  17

8.    Ecology   18

8.1            Ecology Monitoring (marine-based) 18

9.    Site Inspection   20

9.1            Requirements  20

9.2            Findings / Deficiencies During the Reporting Month   20

10.  Environmental Complaint and Non-Compliance   21

10.1          Environmental Complaint, Summons and Prosecution   21

11.  Implementation Status of Mitigation Measures  22

11.1          General  22

11.2          Impact Forecast  23

12.  Conclusions and Recommentations  24

12.1          Conclusions  24

12.2          Recommendations  24

 

 


List of TABLES

Table 2-1        Major Construction Activities of the Works during the Reporting Period

Table 2-1        Status of Environmental Licenses and Permits

Table 2-2        Submission Status as under the EP Stipulation

Table 3-1        Summary of EM&A Impact Monitoring Requirements

Table 3-2        Location of Air Quality Monitoring

Table 3-3        Designated Noise Monitoring Station according to the EM&A Manual

Table 3-4        Noise Monitoring Stations of the EM&A Programme

Table 3-5        Location of Marine Water Quality Monitoring Station

Table 3-6        Air Quality Monitoring Equipment

Table 3-7        Construction Noise Monitoring Equipment

Table 3-8        Instrument of Water Quality Monitoring

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

Table 3-10      Action and Limit Levels for Air Quality

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

Table 3-12      Action and Limit Levels for Water Quality

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

Table 4-2        Summaries of Breaches of Air Quality A/L Levels

Table 5-1        Summary of Construction Noise Monitoring Results

Table 5-2        Summaries of Breaches of Construction Noise A/L Levels

Table 6-1        Results Summary of Depth Average (Surface & Middle Layer) of DO (mg/L)

Table 6-2        Results Summary of Bottom Depth of DO (mg/L)

Table 6-3        Results Summary of Depth Average of Turbidity (NTU)

Table 6-4        Results Summary of Depth Average of Suspended Solids (mg/L)

Table 6-5        Results Summary of Depth Average of Chlorophyll-a (µg/L)

Table 6-6        Summary of Water Quality Exceedance

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

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

Table 9-1        Summary of Site Observations

Table 10-1      Statistical Summary of Environmental Complaints

Table 10-2      Statistical Summary of Environmental Summons

Table 10-3      Statistical Summary of Environmental Prosecution

Table 11-1      Environmental Mitigation Measures in the Reporting Month

 

List of Appendices

Appendix A    Layout Plan of the Project

Appendix B    Organization structure and contact details

Appendix C    Monitoring Location

Appendix D    Event and Action Plan

Appendix E    Graphical plots of Monitoring Results

Appendix F     Weather Information

Appendix G    Waste Flow Table

Appendix H    Implementation Schedule of Environmental Mitigation Measures

Appendix I     Implementation Schedule for Environmental Mitigation Measures

 

 

 

 

 

 

 


1.                           Introduction

1.1                       Project Background

1.1.1                 Civil Engineering and Development Department (hereafter referred as “CEDD”) is the Project Proponent and the Permit Holder of Agreement No. CE 59/2005 (EP) Development of a Bathing Beach at Lung Mei, Tai Po (hereinafter referred as “the Project”), which is a Designated Project to be implemented under Environmental Permit number EP-388/2010 (hereinafter referred as “the EP-388/2010” or “the EP”). 

 

1.1.2                 The major construction activities of the Project comprise construction of 200-metre long bathing beach with a groyne at each end, a shark prevention net; a public car park; retaining walls; and the associated roadworks, drainage and sewerage works.  Layout plan of the Project is shown in Appendix A.  Designated works of the Project under the EP shall include:

(i)            Construction of a 200m long beach with a groyne at each end of the beach which includes dredging and sandfilling works;

(ii)          Construction of one culvert at the eastern side of the beach and another small section of culvert and open drainage channel with gabion embankments at the western end, both to collect and divert surface runoff from upstream locations; and

(iii)        Construction of a beach building with associated beach building facilities, kiosk and a carpark and associated road improvement works adjoining the facility.

 

1.1.3                 CEDD is Site Resident Engineers responsible for the Project management; Welcome Construction CO., Ltd is a Main Contractor (hereinafter referred as “the Main Contractor”) responsible to construction of the Project Works; and Action-United Environmental Services & Consulting (hereinafter referred as “AUES”) has been commissioned as an Independent Environmental Team (hereinafter referred as “the ET”) to implement the relevant EM&A program in accordance with the approved EM&A Manual, as well as the associated duties.  Moreover, Environmental Resources Management is Independent Environmental Checker of the Project.

 

1.1.4                 As part of the EM&A program, baseline monitoring to determine the ambient environmental conditions including air quality, noise and water quality were undertaken between 7 June 2017 and 21 October 2017.  After completed baseline monitoring, Baseline Monitoring Report for Air Quality and Noise (AUES Ref.: TCS00874/16/600/R0022v3) and Baseline Monitoring Report for Water Quality (AUES Ref.: TCS00874/16/600/R0036v2) has been verified by IEC and submitted to EPD for endorsement.  These baseline monitoring reports has summarized the key findings of baseline condition and determined a set of Action and Limit Levels (A/L Levels) based on the baseline data.  The A/L Levels will serve as the yardsticks for assessing the acceptability of the environmental impact during construction phase of the Project Works impact monitoring.

 

1.1.5                 The construction phase of the Project was commenced on 1st December 2017 and EM&A programme was commenced at the same day.  The marine work under the Project was commenced on 24th January 2018 subsequently.

 

1.1.6                 This is the 1st Quarterly EM&A report presenting the monitoring results and inspection findings for the reporting period from 1 December 2017 to 28 February 2018.

 

1.2                       Report Structure

1.2.1                 The Quarterly 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 Impact Monitoring Requirements

Section 4         Air Quality Monitoring

Section 5         Construction Noise Monitoring

Section 6         Water Quality Monitoring

Section 7         Waste Management

Section 8         Ecology

Section 9         Site Inspection

Section 10       Environmental Complaint and non-compliance

Section 11       Implementation Status of Mitigation Measures

Section 12       Conclusion and Recommendation

 

 

 


2.                           Project Organization and Construction Progress

2.1                       Project 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

2.2.1                 The major construction activities undertaken in the Reporting Period are listed below:-

Table 2-1    Major Construction Activities of the Works during the Reporting Period

Month

Major Construction Activities

December 2017

·             Tree felling

·             Site clearance

January 2018

·             Construction of east groyne

·             Relocation of permanent marine buoy

February 2018

·             Construction of east groyne

·             Construction of western box culvert

 

2.3                       Summary of Environmental Submissions

2.3.1                 Summary of currently relevant permits, licenses, and/or notifications on environmental protection for this Project in this Reporting Period is presented in Table 2-1.

Table 2-1    Status of Environmental Licenses and Permits

Item

Description

License/Permit Status

Permit no./Account no./ Ref. no.

From

To

1

Air pollution Control (Construction Dust) Regulation

Ref. Number: 418137

N/A

N/A

2

Chemical Waste Producer Registration

Waste Producers Number (WPN): PN5213-728-W3437-01

21 August 2017

End of Project

3

Water Pollution Control Ordinance

License No.: WT00028905-2017

24 October 2017

31 October 2022

4

Waste Disposal (Charges for Disposal of Construction Waste) Regulation

Billing Account for Disposal of Construction Waste: Account No. 7017686

3 July 2013

End of Project

 

2.3.2                 The submission status as under the EP requirement is presented in Table 2-2.

Table 2-2    Submission Status as under the EP Stipulation

Item

EP condition

Description

Status

1

2.4

Report for Capture and Relocation of Common Rat Snake

Approved by EPD on 15 Sep 2017

(EPD ref.: (15) in EP2/N5/C/46 Pt.6 dated 15 Sep 2017)

2

2.5

Landscape Plan

Submitted to EPD on 28 June 2017

3

4.3

Baseline Monitoring Report for Air Quality and Noise (AUES Ref.: TCS00874/16/600/R0022v3 dated 7 Aug 2017)

Approved by EPD on 8 Jan 2018

(EPD ref.: (36) in EP2/N5/C/46 Pt.6 dated 8 Jan 2018)

4

Baseline Monitoring Report for Water Quality(AUES Ref.: TCS00874/16/600/R0036v2 dated 19 Dec 2017)

Approved by EPD on 10 Jan 2018

(EPD ref.: (37) in EP2/N5/C/46 Pt.6 dated 10 Jan 2018)

 


3.                           Summary of Impact Monitoring Requirements

3.1                       General

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

 

3.2                       Monitoring Parameters

3.2.1                 According to the Project EM&A Manual, the Impact monitoring program covers the following environmental issues:

Ÿ   Air Quality;

Ÿ   Construction Noise; and

Ÿ   Water Quality

 

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

Table 3-1         Summary of EM&A Impact Monitoring Requirements

Environmental Issue

Parameters

Air Quality

Ÿ  1-hour TSP

Ÿ  24-hour TSP

Noise

Ÿ  Leq (30min) in six consecutive Leq(5 min) between 07:00-19:00 on normal weekdays

Water Qaulity

In-situ Measurements

Ÿ  Dissolved Oxygen Concentration (mg/L);

Ÿ  Dissolved Oxygen Saturation (% );

Ÿ  Salinity (mg/L);

Ÿ  Temperature ();

Ÿ  Turbidity (NTU);

Ÿ  pH unit;

Ÿ  Current direction (degree);

Ÿ  Current speed (m/s); and

Ÿ  Water depth (m)

Laboratory Analysis

Ÿ  Suspended Solids (mg/L); and

Ÿ  Chlorophyll-a (µg/L)

 

3.3                       Monitoring Locations

Air Quality

3.3.1                 There are air quality monitoring locations (A4 and A6) recommended in Section 3.1 of the EM&A Manual.  During liaison with the landlord of A6, he refused to provide access and location for installation of High Volume Air Sampler (HVAS).  Therefore, alternative location (A7) was proposed by ET in accordance with Section 3.4 of the EM&A Manual.  The proposed alternative locations are considered capable of effectively representing the baseline conditions at the impact monitoring locations.  The proposal (ref no.: TCS00874/16/300/L0016b) for alternative monitoring locations was verified by IEC and it has been submitted to EPD for approval on 8 May 2017.   The air quality monitoring locations are in Table 3-2 and illustrated in Appendix C.

Table 3-2        Location of Air Quality Monitoring

Station ID

Location

A4

No. 101 Lung Mei Tsuen

A7

Hong Kong Eco-Farm

 


Construction Noise

3.3.2                 According to Section 4.1 of the EM&A Manual, four designated noise sensitive receivers (N1, N2, N3 and N4) were recommended and they are listed in Table 3-3.

Table 3-3        Designated Noise Monitoring Station according to the EM&A Manual

NSR

Location

N1

Village house - No. 165A Lung Mei

N2*

Village house - No. 103 Lung Mei

N3

Village house - No. 70 Lo Tsz Tin

N4

Village house - No. 79 Lo Tsz Tin

Remarks: (*)           Noise monitoring should be conducted at N2a (i.e House No. 101 Lung Mei) if it is changed to residential use during construction phase.

 

3.3.3                 As confirmed on the first day of baseline monitoring, N2a (House no. 101 Lung Mei) has been changed to residential use.  Therefore, the noise monitoring is conducted at N2a and to replace N2.  Moreover, due to the lack of accessibility of noise monitoring at NSR N3 (Village house – No. 70 Lo Tsz Tin), alternative location was proposed to replace N3 to carry out the noise monitoring.  Having reviewed the surrounding condition, NSR N3a (Village house – No. 66C Lo Tsz Tin) was proposed with the rationales summarized in below.

1)         The distance between N3 and N3a is about 18 meter apart and N3a locates at close proximity of the project site and major site activities which are likely to have noise impacts;

2)         N3a is a village type residential house and it is a noise sensitive receiver (NSR);

3)         Accessibility for noise monitoring work at N3a is available; and

4)         Minimal disturbance would be only caused to the proposed monitoring location N3a.

 

3.3.4                 The proposal (ref no.: TCS00874/16/300/L0016b) for alternative monitoring locations was verified by IEC and it has been submitted to EPD for approval on 8 May 2017.  The noise monitoring stations under the EM&A programme are listed in Table 3-4 and illustrated in Appendix C.

Table 3-4        Noise Monitoring Stations of the EM&A Programme

Station ID

Address

N1

Village house No. 165A of Lung Mei

N2a

Village house No. 101 of Lung Mei

N3a

Village house No. 66C of Lo Tsz Tin

N4

Village house No. 79 of Lo Tsz Tin

 

Water Quality

3.3.5                 According to Section 5.1.2 of the Approved EM&A Manual, two Reference Stations (R1 and R2), three impact stations (I1, I2 and I3), three sensitive receivers (FCZ1, W1 and M1) and one Gradient station (G1), were identified to perform water quality monitoring.  Detailed and co-ordnance of water quality monitoring stations is described in Table 3-5 and the graphical is shown in Appendix C.

Table 3-5        Location of Marine Water Quality Monitoring Station

Station

Coordinates

Description

Easting

Northing

G1

841483.9

835936.1

Gradient Station - to assist in the identification of the source of any impact.

R1

842307.4

835718.4

Reference Station - for the background water quality for Tolo Harbour as it is at the channel where the water exchange between the enclosed Plover Cove and Tolo Harbour take place. It is located at south of the Project dredging/sandfilling area.

R2

840739.4

836212.4

Reference Station - for the background water quality in the Plover Cove region.  It is located at southwest of the Project dredging/sandfilling area.

I1

841338.5

836588.5

Impact Station - located outside the mixing zone of dredging/sandfilling works of the Project.

I2

841590.3

836601.2

Impact Station - located outside the mixing zone of dredging/sandfilling works of the Project.

I3

841807.0

836680.9

Impact Station - located outside the mixing zone of dredging/sandfilling works of the Project.

W1

841858.9

836571.0

Sensitive Receiver - located at the Water Sport Centre, which is about 0.25 km distance to the southeast of the dredging/sandfilling area.

M1

840822.2

836416.4

Sensitive Receiver - located at the Ting Kok SSSI, which is about 0.8 km distance to the west of the dredging/sandfilling area.

FCZ1

841180.6

835230.8

Sensitive Receiver - located at the Yim Tin Tsai East Fish Culture Zone, which is about 1.5 km distance to the southwest of the dredging/sandfilling area.

 

3.4                       Monitoring Frequency and Period

3.4.1                 The frequency and the duration for impact monitoring are summarized below.

Air Quality Monitoring

Ÿ  Parameters:

1-hour TSP and 24-hour TSP

Ÿ  Frequency:

3 times every six days for 1-hour TSP and once every 6 days for 24-hour TSP

Ÿ  Duration:

Throughout the construction period

 

Noise Monitoring

Ÿ  Parameters:

LAeq(30min) and statistical results L10 & L90

Ÿ  Frequency:

Leq (30min) in 6 consecutive Leq(5min) for once a week during 07:00-19:00 on normal weekdays

Ÿ  Duration:

Throughout the construction period

 

Water Quality (Marine) Monitoring

Ÿ  Parameters:

In-situ measurements including water depth, Dissolved Oxygen (DO) concentration (mg/L) & saturation (%), Salinity (mg/L), Temperature (ºC) and Turbidity (NTU); and Suspended Solids (mg/L) and Chlorophyll-a (µg/L) are analyzed by HOKLAS-accredited laboratory.

Ÿ  Frequency:

Three days a week, at mid ebb and mid flood tides.  The interval between 2 sets of monitoring will be more than 36 hours.

Ÿ  Sampling Depth

1)        Three depths: 1m below water surface, 1m above sea bottom and at mid-depth when the water depth exceeds 6m;

2)        If the water depth is between 3m and 6m, two depths: 1m below water surface and 1m above sea bottom; and

3)        If the water depth is less than 3m, 1 sample at mid-depth is taken

Ÿ  Duration:

During marine works proceeding such as the dredging and sand filling

 

3.4.2                 In addition to the water quality parameters, other relevant data will also be to measure and record, which are included the location of the sampling stations, water depth, time, weather conditions, sea conditions, tidal stage, current water flow direction and speed, special phenomena and work activities undertaken around the monitoring and works area that may influence the monitoring results.  Observations on any special phenomena and work underway at the Project site during the time of sampling will also be to record.

 

3.5                       Monitoring Instrument

Air Quality Monitoring

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

 

3.5.2                 All equipment to be used for air quality monitoring is listed in Table 3-6.

Table 3-6         Air Quality Monitoring Equipment

Equipment

Model

24-Hour TSP

High Volume Air Sampler

TISCH High Volume Air Sampler, HVS Model TE-5170

Calibration Kit

TISCH Calibration Kit Mode TE-5025A

1-Hour TSP

Portable Dust Meter

Sibata LD-3B Laser Dust Meter and/or TSI AM510 Laser Dust Monitor

 

Noise Monitoring

3.5.3                 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 for reference.

 

3.5.4                 Monitoring equipment to be used for construction noise measurement is listed in Table 3-7.

Table 3-7         Construction Noise Monitoring Equipment

Equipment

Model

Integrating Sound Level Meter

Rion NL-31 or Rion NL-52

Acoustic Calibrator

B&K Type 4231 or Rion NC-74 or Rion NC-73

Portable Wind Speed Indicator (#)

Anemometer AZ Instrument 8908

(#) Wind speed is reference data only and there is no calibration certificate for portable wind speed indicator.

 

Water Quality Monitoring

3.5.5                 For water quality monitoring, the used equipment should be fulfill the requirements under the Approved EM&A Manual Section 5.1.1.  Requirement of instruments is described in the following sections.

 

3.5.6                 Instruments to be used for Water quality monitoring is listed in Table 3-8.

Table 3-8         Instrument of Water Quality Monitoring

Equipment

Model

A Digital Global Positioning System

GPS12 Garmin

Water Depth Detector

Eagle Sonar CUDA 300

Water Sampler

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

Thermometer & DO meter

YSI Professional Plus Multifunctional Meter

pH meter

Turbidimeter

Salinometer

Current Meter

Valeport Ltd – Model 106 Self Recording/Direct Reading Current Meter

Storage Container

‘Willow’ 33-litre plastic cool box with Ice pad

 

3.6                       Monitoring Procedures

Air Quality

1-hour TSP

3.6.1                 Operation of the 1-hour TSP meter will follow manufacturer’s Operation and Service Manual.

 

3.6.2                 The 1-hour TSP monitor, brand named Sibata LD-3B Laser Dust Meter” or “TSI AM510 Laser Dust Monitor” is a portable, battery-operated laser photometer. The 1-hour TSP meter provides a real time 1-hour TSP measurement based on 900 light scattering. The 1-hour TSP monitor consists of the following:

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

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

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

 

3.6.3                 The 1-hour TSP meter to be used will be within the valid period, calibrated by the manufacturer prior to purchasing. Zero response of the instrument will be checked before and after each monitoring event.  Annually calibration with the High Volume Sampler (HVS) in same condition would be undertaken by the Laboratory.

 

24-hour TSP

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

a.              An anodized aluminum shelter;

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

c.              A blower motor assembly;

d.             A continuous flow/pressure recorder;

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

f.              A 7-day mechanical timer, and

g.              A power supply of 220v/50 hz

 

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

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

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

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

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

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

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

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

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

 

3.6.6                 All the sampled 24-hour TSP filters will be collected and put into the filter envelope provided by the laboratory.  The sample will be kept in normal air conditioned room conditions, i.e. 70% HR (Relative Humidity) and 25oC and delivery to the office within 48 hours and sent to laboratory for analysis.  The sampled filter will be kept in the laboratory for six months prior to disposal.

 

3.6.7                 The HVS used for 24-hour TSP monitoring will be calibrated before the commencement for sampling, and after in two months interval for 1 point checking of maintenance and six months interval for five points calibrate in accordance with the manufacturer’s instruction using the NIST-certified standard calibrator (TISCH Calibration Kit Model TE-5025A) to establish a relationship between the follow recorder meter reading in cfm (cubic feet per minute) and the standard flow rate, Qstd, in m3/min.  Motor brushes of HVS will be regularly replaced of about five hundred hours per time.

 

Construction Noise

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

 

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

 

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

 

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

 

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

 

Water Quality (Marine) Monitoring

3.6.13             Marine water quality monitoring will be conducted at the designated locations in accordance with EM&A Manual. The operating and analytical of sampling procedures are described as below:

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

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

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

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

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

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

Ÿ  Water sample would be collected by a water sampler and then filled in high-density polythene bottles.  Before the water sample storage, the sampling bottles will be pre-rinsed with the same water sample.  The sample bottles then is packed in cool-boxes (cooled at 4OC without being frozen), and delivered to HOKLAS accredited laboratory for the chemical analysis as followed APHA Standard Methods. 

Ÿ  The laboratory has been comprehensive quality assurance and quality control programmes.  For QA/QC procedures, one duplicate samples of every batch of 20 samples is analyzed as followed the HOKLAS accredited requirement.

 

3.6.14             During marine water sampling period, all in-situ measurement equipment will be calibrated at three months interval accordingly. Except for the Current Velocity and Direction water flow meter will be calibrated every two years as recommended by the manufactory.   Available calibration certificates will be issued to ensure the performance of equipment to use for in-situ measurement.

 

3.6.15             Before each round of monitoring, the dissolved oxygen probe will be calibrated by wet bulb method; a zero check in distilled water will be performed with the turbidity and salinity probes; 4 and 10 values of the standard solution will be undertaken to check the accuracy of pH value.

 

3.6.16             Valid calibration certificates of monitoring equipment of air quality, construction noise and water quality are shown in respectively monthly EM&A Report.

 

Laboratory Analysis

3.6.17             Chemical analysis will be conducted for all water samples by a HOKALS accredited laboratory - ALS Technichem (HK) Pty Ltd.  The chemicals analysis method and reporting limit is shown Table 3-9.

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

Parameter

ALS Method Code

In-house Method Reference 1

Reporting Limit

Total Suspended Solids

EA025

APHA 2540D

2 mg/L

Chlorophyll-a

EP008F

APHA 10200 H2&H3

0.1 μg/L

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

 

3.7                       Meteorological Information

3.7.1                 The meteorological information including wind direction, wind speed, humidity, rainfall, air pressure and temperature etc. during impact monitoring is extracted from the closest Hong Kong Observatory Station.  To obtain the most appropriate meteorological information where available, Air Temperature/Pressure and Relative Humidity will be extracted from Tai Po Station and wind speed and direction will be extracted from Tai Mei Tuk Station.

 

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

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

Table 3-10      Action and Limit Levels for Air Quality

Monitoring Station

Action Level (mg /m3)

Limit Level (mg/m3)

1-hour TSP

24-hour TSP

1-hour TSP

24-hour TSP

A4

275

142

500

260

A7

274

141

500

260

 

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

Time Period: 0700-1900 hours on normal weekdays

Monitoring

Location

Action Level

Limit Level Note 1 & Note 2

N1, N2a, N3a, and N4

When one documented complaint is received

75

Note 1:  Acceptable Noise Levels for school should be reduced to 70 dB(A) and65 dB(A) during examination period

Note 2:  If works are to be carried out during restricted hours, the conditions stipulated in the construction noise permit issued by the NCA have to be followed.

 

Table 3-12       Action and Limit Levels for Water Quality

Monitoring Location

Action Level

Limit Level

Depth Average of SS (mg/L)

I1

7.0

OR 120% of any reference stations at the same tide of the same day

7.5

OR 130% of any reference stations at the same tide of the same day

I2

7.0

8.1

I3

8.3

15.0

W1

8.0

8.6

M1

10.0

11.0

FCZ1

7.0

8.0

Monitoring Location

Dissolved Oxygen (mg/L)

Depth Average of Surface & Mid-depth

Bottom

Depth Average of Surface & Mid-depth

Bottom

I1

5.08

N/A

4.80

N/A

I2

5.26

3.64

4.88

3.37

I3

5.03

4.09

4.77

3.19

W1

4.67

2.41

4.54

2.33

M1

4.73

N/A

4.70

N/A

FCZ1

5.00

3.43

5.00

3.18

Monitoring Location

Depth Average of Turbidity (NTU)

I1

2.8

OR 120% of any reference stations at the same tide of the same day

2.9

OR 130% of any reference stations at the same tide of the same day

I2

3.5

7.7

I3

2.6

3.0

W1

2.9

3.3

M1

5.2

6.6

FCZ1

3.2

3.4

Monitoring

Location

Surface, Middle & Bottom of Chlorophyll-a (μg/L)

I1

11.1

12.1

I2

11.0

13.1

I3

11.3

14.5

W1

11.3

16.1

M1

16.9

42.4

FCZ1

11.8

12.5

Notes:

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

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

(c)        Both Action and Limit Levels for DO (surface and middle) in the FCZ1 are less than 5 mg/L.

 

Event Action Plan

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

 

3.9                       Data Management and Data QA/QC Control

3.9.1                 The impact monitoring data were handled by the ET’s in-house data recording and management system.

 

3.9.2                 The monitoring data recorded in the equipment were downloaded directly from the equipment at the end of each monitoring day.  The downloaded monitoring data were input into a computerized database properly maintained by the ET.  The laboratory results were input directly into the computerized database and checked by personnel other than those who input the data.

 

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

 

 

 


4.                           Air Quality Monitoring

4.1                       General

4.1.1                 In the Reporting Period, air quality monitoring was performed at the proposed monitoring locations A4 and A7.

 

4.2                       Results of Air Quality Monitoring

4.2.1                 Summary of air quality monitoring results during the Reporting Period are tabulated in Table 4-1.  The database of monitoring result throughout the Reporting Period is shown in Appendix E and the relevant graphical plots are shown in Appendix F. 

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

Monitoring Location

1-hour TSP (µg/m3)

24-hour TSP (µg/m3)

Max

Min

Mean

Max

Min

Mean

A4

147

31

60

110

30

62

Record Date

7-Dec-17

26-Feb-18

48 events

12-Dec-17

21-Feb-18

17 events

A7

155

27

60

81

33

56

Record Date

7-Dec-17

26-Feb-18

48 events

22-Dec-17

1-Dec-17

17 events

 

4.2.2                 Breaches of air quality A/L levels and statistical analysis of compliance for the air quality monitoring results are summarized in Table 4-2.

 

Table 4-2         Summaries of Breaches of Air Quality A/L Levels

Location

Exceedance

1-hour TSP

24- hour TSP

Total

A4

Action Level

0

0

0

Limit Level

0

0

0

A7

Action Level

0

0

0

Limit Level

0

0

0

 

4.2.3                 As shown in Tables 4-1 to 4-2, all the 1-hour TSP and 24-hour TSP monitoring results were below the Action/Limit Levels.  No Notification of Exceedance (NOE) was issued in this Reporting Period.

 

4.2.4                 The summary of weather conditions during the Reporting Period is presented in Appendix G.

 


5.                           Construction Noise Monitoring

5.1                       General

5.1.1                 In the Reporting Period, construction noise quality was were performed at the designated monitoring locations N1, N2a, N3a and N4.

 

5.2                       Results of Noise Monitoring

5.2.1                 Free-field status were performed at N1 and N3a and façade correction (+3 dB(A)) has been added for the correction in according to the acoustical principles and EPD guidelines.  The noise monitoring results at the designated locations are summarized in Tables 5-1.  The database of monitoring result throughout the Reporting Period is shown in Appendix E and the relevant graphical plots are shown in Appendix F. 

Table 5-1         Summary of Construction Noise Monitoring Results

Monitoring Location

Leq, 30min (dB((A))

Max

Min

N1(*)

61

52

Record Date

10-Jan-18,16-Jan-18, 8-Feb-18

20-Feb-18

N2a

63

50

Record Date

19-Dec-17

20-Feb-18

N3a(*)

74

54

Record Date

4-Jan-18

1-Dec-17, 16-Jan-18, 14-Feb-18

N4

62

54