Job No.: TCS00881/18

 

 

 

 

 

 

 

 

 

Site Formation and Associated Infrastructural Works for Development of Columbarium, Crematorium and Related Facilities at Sandy Ridge Cemetery

 

 

 

 

 

 

 

 

 

Baseline Monitoring Report (Air, Noise and Water)

 

 

 

 

 

 

 

 

Prepared For

 

 

 

 

Hsin Chong Tsun Yip Joint Venture

 

 

 

 

 

 

 

 

 

 

 

Date

Reference No.

Prepared By

Certified By

8 August 2018

TCS00881/18/600/R0037v3

Ben Tam

(Environmental Consultant)

Tam Tak Wing

(Environmental Team Leader)

 

Version

Date

Remarks

1

28 May 2018

First Submission

2

8 August 2018

Amended against EPD’s comments

3

5 September 2018

Amended against EPD’s comments

 

 

 

 

 

 


 

 

 

 

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

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

Ÿ   Other CEDD’s Contract as related Development of Columbarium at Sandy Ridge Cemetery

 

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 part of the EM&A programme, baseline monitoring is required to be conducted prior to commencement of the construction works under the Project.  Baseline monitoring for air quality was conducted from 25 April 2018 to 9 May 2018 and baseline noise monitoring was conducted from 25 April 2018 to 8 May 2018.  For baseline water quality monitoring, due to accessibility to the monitoring point, it was conducted from 27 April 2018 to 23 May 2018 for Locations M1, M3 and M4 and from 12 July 2018 to 6 August 2018 for Location M2.  During the baseline monitoring period, no construction activities under the Project or other external influencing factors of significant concern were observed.

 

ES.05.        This report summarizes the key findings and presents the process and rationale behind determining a set of Action and Limit Levels (A/L Levels) of air quality, construction noise and water quality based on the baseline monitoring data.  These A/L Levels will serve as the yardsticks for assessing the acceptability of the environmental impact during construction phase of the Project Works.  They are statistical in nature and derived according to the criteria set out in the Approved EM&A Manual.

 

ES.06.        Results of the derived Action and Limit Levels for the air quality, noise and water quality are given in Tables ES-1, ES-2 and ES-3 below.

Table ES-1        Action and Limit Levels of Air Quality Monitoring

Monitoring Station

Action Level (mg /m3)

Limit Level (mg/m3)

1-hour TSP

24-hour TSP

1-hour TSP

24-hour TSP

ASR-1

331

181

500

260

ASR-2

316

165

500

260

ASR-3

307

160

500

260

 


Table ES-2        Action and Limit Levels of Construction Noise Monitoring

Monitoring Location

Action Level

Limit Level in dB(A)

Time Period: 0700-1900 hours on normal weekdays

CN-1,CN-2, CN-3, CN-4

When one or more documented complaints are received

75 dB(A)

Note 1:     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 ES-3        Action and Limit Levels of Water Quality Monitoring

Parameter

Performance criteria

Monitoring Location

M1

M2

M3

M4

DO (mg/L)

Action Level

3.03

4.99

4.58

3.62

Limit Level

2.97

4.90

4.49

3.52

Turbidity (NTU)

Action Level

7.1

39.7

5.6

5.4

Limit Level

7.6

42.2

5.9

5.9

SS (mg/L)

Action Level

8.5

29.0

9.3

4.8

Limit Level

10.1

31.0

9.5

5.0

 

ES.07.        In case where exceedance of these environmental criteria occurs, actions should be carried out in accordance with the Event Action Plan in the Approved EM&A Manual.

 

 


Table of Contents

1     Introduction   1

1.1            Project Background   1

1.2            Report Structure  2

2     Summary of Baseline Monitoring Requirement   3

2.1            General  3

2.2            Monitoring Parameters  3

2.3            Monitoring Locations  3

2.4            Monitoring Frequency and Period   5

2.5            Monitoring Equipment  5

2.6            Derivation of Action/Limit (A/L) Levels  8

3     Baseline monitoring methdology   10

3.1            General  10

3.2            Location of Baseline Monitoring   10

3.3            Monitoring Equipment at Baseline Monitoring   10

3.4            Monitoring Procedures  10

3.5            Data Management and Data QA/QC Control  12

4     Baseline Monitoring Results  13

4.1            General  13

4.2            Results of Air Quality Monitoring   13

4.3            Results of Noise Monitoring   14

4.4            Results of Water Quality Monitoring   17

4.5            Discussion and Recommendations  20

5     Conclusions and Recommentations  21

5.1            Conclusions  21

5.2            Recommendations  21

 


List of TABLES

Table 2-1        Summary of EM&A Requirements

Table 2-2        Baseline Monitoring Stations for Air Quality

Table 2-3        Baseline Monitoring Stations for Construction Noise

Table 2-4        Baseline Monitoring Stations for Water Quality

Table 2-5        Air Quality Monitoring Equipment

Table 2-6        Construction Noise Monitoring Equipment

Table 2-7        Water Quality Monitoring Equipment

Table 2-8        Derivation of Action and Limit Levels for Air Quality

Table 2-9        Derivation of Action and Limit Levels for Construction Noise

Table 2-10      Derivation of Action and Limit Levels for Water Quality

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

Table 4-2        Summary of 24-hour and 1-hour TSP Monitoring Results – ASR-2

Table 4-3        Summary of 24-hour and 1-hour TSP Monitoring Results – ASR-3

Table 4-4        Action and Limit Levels for Air Quality Monitoring for all Stations

Table 4-5        Summary of Noise Monitoring Results (dB(A)) – CN-1

Table 4-6        Summary of Noise Monitoring Results (dB(A)) – CN-2

Table 4-7        Summary of Noise Monitoring Results (dB(A)) – CN-3

Table 4-8        Summary of Noise Monitoring Results (dB(A)) – CN-4

Table 4-9        Action and Limit Levels of Construction Noise Monitoring

Table 4-10      Summary of Water Quality Monitoring Results - Dissolved Oxygen, mg/L

Table 4-11      Summary of Water Quality Monitoring Results - Turbidity, NTU

Table 4-12      Summary of Water Quality Monitoring Results – Suspended Solids, mg/L

Table 4-13      Action and Limit Levels for Water Quality Monitoring

 

 

List of Appendices

Appendix A    Layout Plan of the Project

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

Appendix C    Monitoring Locations for Baseline Monitoring

Appendix D    Valid Calibration Certificate of Monitoring Equipment

Appendix E    HOKLAS-accreditation Certificate of the Testing Laboratory.

Appendix F    Baseline Monitoring Schedules

Appendix G    Meteorological Data during Baseline Monitoring (Ta Kwu Ling Station)

Appendix H    Monitoring Results Data of the air quality (24-hour TSP), Noise and Water Quality

Appendix I     Laboratory Data Report

 

 

 


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”. 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 and they are listed below.

 

1.1.2                 Contract No. CV/2016/10 - Site Formation and Associated Infrastructural Works for Development of Columbarium at Sandy Ridge Cemetery

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

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)

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 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 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 HCTY-JC by EPD on 23 February 2018.  Major works to be executed under the Project shall include to the following:

 

A Designated Project 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 Project

(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 is required to determine the ambient environmental conditions before construction work commencement. 

 

1.1.7                 Baseline monitoring for air quality was conducted from 25 April 2018 to 9 May 2018 and baseline noise monitoring was conducted from 25 April 2018 to 8 May 2018.  For baseline water quality monitoring, due to accessibility to the monitoring point, it was conducted from 27 April 2018 to 23 May 2018 for Locations M1, M3 and M4 and from 12 July 2018 to 6 August 2018 for Location M2.  During the baseline monitoring period, no construction activities under the Project or other external influencing factors of significant concern were observed.

 

1.1.8                 This Baseline Monitoring Report presents the detailed baseline study including project background, monitoring methodology, monitoring results, summary of findings, and Action/Limit (A/L) Levels established for subsequent use in the Project construction phase EM&A programme.

 

1.2                       Report Structure

1.2.1                 The Baseline Monitoring Report is structured into the following sections:-

Section 1    Introduction

Section 2    Summaries of Baseline Monitoring Requirement.

Section 3    Baseline Monitoring Methodology

Section 4    Baseline Monitoring Results

Section 5    Conclusions and Recommendations

 

 

 

 


2                             Summary of Baseline Monitoring Requirement

2.1                       General

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

 

2.1.2                 This report presents the results obtained during the baseline monitoring of air quality, noise and water quality. A summary of the baseline EM&A requirement for air quality, noise and water quality monitoring are presented in the sub-sections below.

 

2.2                       Monitoring Parameters

2.2.1                 The EM&A baseline monitoring shall cover the following environmental aspect:

                     Air quality;

                     Construction noise; and

                     Water quality.

 

2.2.2                 A summary of the monitoring parameters is presented in Table 2-1 below

Table 2-1         Summary of EM&A Requirements

Environmental Issue

Parameters

Air Quality

Ÿ  1-hour TSP;

Ÿ  24-hour TSP

Noise

Ÿ  Leq (30min) in normal working days (Monday to Saturday) 07:00-19:00 except public holiday; and

Ÿ  3 sets of consecutive Leq (5min) on restricted hours i.e. 19:00 to 07:00 next day, and whole day of public holiday or Sunday

Water Quality

In-situ Measurements

Ÿ  Dissolved Oxygen Concentration (mg/L);

Ÿ  Dissolved Oxygen Saturation (% );

Ÿ  Temperature ();

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)

 

2.3                       Monitoring Locations

2.3.1                 According to the Approved EM&A Manual, the designated monitoring locations for air quality, noise and water quality under the monitoring programme are shown in Appendix B. 

 

Air Quality

2.3.2                 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.  When alternative monitoring locations area proposed. The proposed site should be selected based on the following criteria as far as practicable:

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.

 

2.3.3                 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.  Three (3) designated air quality monitoring locations recommended in the Approved EM&A Manual were identified during the site visit.  Moreover, the premises owners for these 3 locations were agreed to set up the monitoring equipment for monitoring work. The locations chosen to conduct air quality baseline monitoring are considered capable of effectively representing the baseline conditions at the impact monitoring locations.  The baseline air quality monitoring locations are listed in Table 2-2 and illustrated in Appendix C.

Table 2-2        Baseline Monitoring Locations for Air Quality

Location ID

Location ID in EM&A Manual

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

 

Construction Noise

2.3.4                 There were 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 visit. They are listed in Table 2-3 and shown in Appendix C.

Table 2-3        Baseline Monitoring Locations for Construction Noise

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)

 

Water Quality

2.3.5                 There were four (4) water quality monitoring locations recommended in the Approved EM&A Manual Section 7.6.1.2.  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.  Water quality monitoring stations M1, M3 and M4 have been identified during the site visit.  Having assessed the possible routes to M2, the access to M2 was finally granted in late June 2018.

 

2.3.6                 The location and coordinates for baseline water quality monitoring are listed in Table 2-4 and illustrated in Appendix C.  

Table 2-4        Baseline Monitoring Stations for Water Quality

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

 

2.4                       Monitoring Frequency and Period

2.4.1                 The requirements of baseline monitoring are stipulated in Sections 5.7.1.1, 6.6.1.1 and 7.7.1.2 of the approved EM&A Manual and presented as follows.

 

Air Quality Monitoring

2.4.2                 Monitoring frequency for air quality baseline monitoring is as follows:

Ÿ   1-Hour TSP

3 sets of 1-hour TSP monitoring shall be carried out daily for a period of at least two weeks.

Ÿ   24-Hour TSP

Continuous monitoring of 24-hour shall be carried out daily for a period of at least two weeks.

 

Noise Monitoring

2.4.3                 The baseline noise monitoring shall be carried out continuous daily for a period of at least two weeks. The baseline 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).  For restricted hours between 19:00 and 07:00 (next morning), 3 sets of Leq (5mins) of noise level measurement shall be carry out daily for a period of at least two weeks. However, the baseline monitoring for construction noise in restricted hours was considered as less significance with the following rationales:

                 Setting A/L Levels for construction noise is not based on baseline noise levels at any monitoring stations (refer to the following Section 6.8: Action/Limit Levels and Event Action Plan); and

                 No construction activities are to be undertaken during the restricted hours, no construction noise impacts related to the works under the Project are therefore envisaged during the restricted hours.

 

Water Quality Monitoring

2.4.4                 The baseline monitoring frequency shall be 3 days per week, for at least 4 weeks prior to the commencement of construction works.  The interval between two sets of monitoring shall not be less than 36 hours.

 

2.5                       Monitoring Equipment

Air Quality Monitoring

2.5.1                 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 approve.

 

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

 

2.5.3                 All equipment used for baseline air quality monitoring is listed in Table 2-5.

Table 2-5         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

2.5.4                 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.

 

2.5.5                 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 at their premises.

 

2.5.6                 Under this situation, the ET proposed to use alternative method to obtain representative wind data which extract from the Hong Kong Observatory Ta Kwu Ling Weather Station.  Ta Kwu Ling Station is 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

2.5.7                 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.

 

2.5.8                 Noise monitoring equipment used for baseline monitoring is listed in Table 2-6.

Table 2-6         Construction Noise Monitoring Equipment

Equipment

Model

Integrating Sound Level Meter

B&K Type 2238 / Rion NL-52 / NL-31

Calibrator

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

Portable Wind Speed Indicator

Testo Anemometer

 

2.5.9                 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.  The acoustic calibrator and sound level meter used in the baseline monitoring was calibrated yearly.

 

Water Quality Monitoring

2.5.10             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

2.5.11             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 – 20 mg/L and 0 – 200% saturation; and

       A temperature of 0 – 45 degree Celsius.

 

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

 

2.5.13             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

2.5.14             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 0–1000 NTU (for example, Hach model 2100P or an approved similar instrument).

 

Salinity Measurement

2.5.15             A portable salinometer capable of measuring salinity in the range of 0–40 parts per thousand (ppt) should be provided for measuring salinity of the water at each monitoring location.

 

 

pH Measurement

2.5.16             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

2.5.17             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

2.5.18             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

2.5.19             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.

 

2.5.20             For sampling from very shallow water depths e.g. <0.5 m, water sample collection will be directly from water surface below 100mm use sampling 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

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

 

2.5.22             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.

 

2.5.23             Water quality monitoring equipment used in the baseline monitoring is listed in Table 2-7.

Table 2-7         Water Quality Monitoring Equipment

Equipment

Model

Water Depth Detector

Eagle Sonar CUDA 300 or tape measures

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 ProDSS Digital Sampling System Water Quality Meter or YSI Professional Plus Multifunctional Meter

pH meter

YSI ProDSS Digital Sampling System Water Quality Meter or YSI Professional Plus Multifunctional Meter

Turbidimeter

YSI ProDSS Digital Sampling System Water Quality Meter or Hach 2100Q

Salinometer

YSI ProDSS Digital Sampling System Water Quality Meter or YSI Professional Plus Multifunctional 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

 

2.5.24             Furthermore, Suspended solids (SS) analysis is carried out by a local HOKLAS-accredited laboratory - ALS Technichem (HK) Pty Ltd.

 

2.6                       Derivation of Action/Limit (A/L) Levels

2.6.1                 The baseline results form the basis for determining the environmental acceptance criteria for the impact monitoring.  A summary of derivation of Action/Limit (A/L) Levels for air quality, construction noise and water quality are shown in Table 2-8, 2-9 and 2-10 respectively.

Table 2-8        Derivation of Action and Limit Levels for Air Quality

Parameter

Action Level

Limit Level

24-hour TSP

For baseline level £ 200 mg/m3:

Action level = (Baseline × 1.3 + Limit level)/2

260 mg/m3

For baseline level > 200 mg/m3:

Action level = Limit level

1-hour TSP

For baseline level £ 384 mg/m3:

Action level = (Baseline × 1.3 + Limit level)/2

500 mg/m3

For baseline level > 384 mg/m3:

Action level = Limit level

 

Table 2-9         Derivation of Action and Limit Levels for Construction Noise

Time Period

Action Level in dB(A)

Limit Level in dB(A)

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. 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 2-10       Derivation of Action and Limit Levels for Water Quality

Parameters

Action

Limit

DO in mg/l

5 percentile of baseline data [1]

4 mg/L or 1 percentile of baseline data [1]

SS in mg/l

95 percentile of baseline data [2]

99 percentile of baseline data [2]

Turbidity in NTU

95 percentile of baseline data [2]

99 percentile of baseline data [2]

Notes:

[1]      For DO measurement, non-compliance occurs when monitoring result is lower than the limits.

[2]      For SS and turbidity, non-compliance of water quality results when monitoring results is higher than the limits.

Remarks:

All the figures given in the table are used for reference only and the EPD may amend the figures whenever necessary.


3                             Baseline monitoring methdology

3.1                       General

3.1.1                 The baseline monitoring of air quality, noise and water quality were conducted prior commencement of the Project.  During the baseline monitoring period, there were no construction activities of this project or other external influencing factors of significant concern observed by the ET.

 

3.2                       Location of Baseline Monitoring

3.2.1                 Baseline monitoring for air quality was conducted from 25 April 2018 to 9 May 2018 and baseline noise monitoring was conducted from 25 April 2018 to 8 May 2018.  For baseline water quality monitoring, due to accessibility to the monitoring point, it was conducted from 27 April 2018 to 23 May 2018 for Locations M1, M3 and M4 and from 12 July 2018 to 6 August 2018 for Location M2. The information of monitoring stations is referred to Tables 2-2, 2-3 and 2-4 and the location of monitoring locations are shown in Appendix C.

 

3.3                       Monitoring Equipment at Baseline Monitoring

3.3.1                 All the monitoring equipment to be used for baseline monitoring are listed in Tables 2-5, 2-6 and 2-7 and they has been agreed with the IEC prior to commencement of the baseline monitoring.

 

3.4                       Monitoring Procedures

Air Quality

1-hour TSP

3.4.1                 The 1-Hour TSP monitor, a Sibata LD-3 Laser Dust monitor Particle Mass Profiler & Counter was used for baseline monitoring, which 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 consisted 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.

 

3.4.2                 The 1-hour TSP meter used is within the valid period, calibrated by the manufacturer prior to purchasing. Zero response of the instrument was checked before and after each monitoring event.  Operation of the 1-hour TSP meter was follow manufacturer’s Operation and Service Manual.  A valid calibration certificate is attached in Appendix D.

 

24-hour TSP

3.4.3                 The equipment used for 24-hour TSP measurement is a Tisch Environmental, Inc. Model TE-5170 TSP high volume air sampling system, which complied with EPA Code of Federal Regulation, Appendix B to Part 50. The High Volume Air Sampler (HVS) consists of the following:

a.              An anodized aluminum shelter;

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

c.              A blower motor assembly;

d.             A continuous flow/pressure recorder;

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

f.              A 7-day mechanical timer, and

g.              A power supply of 220v/50 hz

 

3.4.4                 Prior of 24-hour TSP monitoring, the HVS was calibrated in accordance with the manufacturer’s instruction using the NIST-certified standard calibrator (Tisch Calibration Kit Model TE-5025A).  The 24-hour TSP Monitoring using the HVS was also processed in accordance with the manufacturer’s Operations Manual.  A valid calibration certificate of the calibration kit with the certificate of HVS calibrated is attached in Appendix D.

 

3.4.5                 24-hour TSP was collected by the ET on filters of HVS and quantified by a local HOKLAS accredited laboratory, ALS Technichem (HK) Pty Ltd (ALS), upon receipt of the samples.  The ET keeps all the sampled 24-hour TSP filters in normal air conditioned room conditions, i.e. 70% HR (Relative Humidity) and 25oC, for six months prior to disposal.

 

Background Noise

3.4.6                 Sound level meter listed above comply with the International Electrotechnical Commission Publications 651: 1979 (Type 1) and 804: 1985 (Type 1) specifications, as recommended in Technical Memorandum (TM) issued under the Noise Control Ordinance (NCO), which was used for baseline noise monitoring.  A valid of calibration certificates including sound level meter and an acoustic were shown in Appendix D.

 

3.4.7                 The noise measurement was performed with the meter set to FAST response and on the A-weighted equivalent continuous sound pressure level (Leq).  Leq(30min) in six consecutive Leq(5min) and three sets of Leq(5min) measurements were respective used as the monitoring parameter throughout the baseline monitoring period during the daytime and the restricted hours.

 

3.4.8                 During the baseline monitoring, the sound level meter was mounted on a tripod at a height of about 1.2 m and placed at the monitoring locations and oriented such that the microphone was pointed to the site with the microphone facing perpendicular to the line of sight. The windshield was fitted for the measurement.  For the baseline noise monitoring, CN-1, CN-2 and CN-3 were conducted in a free-field situation i.e. at least 3.5 m away from reflective surfaces of the adjacent buildings or walls; furthermore CN-4 measurement was carried at 1 m from the exterior of the building façade.

 

3.4.9                 Prior baseline noise measurement, the accuracy of the sound level meter was checked using an acoustic calibrator generating a known sound pressure level at a known frequency.  The calibration level from before and after the noise measurement agrees to within 1.0dB.

 

3.4.10             During the noise measurement, a portable wind speed meter was used to check wind speed (m/s).  For baseline noise monitoring, no wind speed was exceeding 5m/s or gusts exceeding 10m/s.  Also, noise measurement in time was no fog and rain.

 

Water Quality

3.4.11             Water quality monitoring was conducted at the four designated locations. In-situ of replicate measurements was undertaken during baseline monitoring; where the difference in value between the first and second in-situ measurement of DO or turbidity parameters is more than 25% of the value of the first reading, the reading was discarded then further readings to be take.  Moreover, duplicate sample collection was also conducted from each monitoring location.  The sampling and in-situ measurement process are below:

 

Sampling Procedure

3.4.12             A Digital Global Positioning System (GPS) was used to identify the designated monitoring stations.  Prior to water sampling, a portable, battery-operated echo sounder or tape measure was used for the determination of water depth at each station.  At each station, water samples were collected from 0.1m below water surface or water surface to prevent the river bed sediment for stirring.

 

3.4.13             The sample container was rinsed with a portion of the water sample.  The water sample then was transferred to the high-density polythene bottles as provided by the laboratory, labeled with a unique sample number and sealed with a screw cap.

 

3.4.14             Before commencement of the sampling, general information such as the date and time of sampling and weather condition as well as the personnel responsible for the monitoring were be recorded on the monitoring field data sheet.

 

3.4.15             A ‘Willow’ 33-liter plastic cool box packed with ice was used to preserve the collected water samples prior to arrival at the laboratory for chemical determination.  The water temperature of the cool box was maintained at a temperature as close to 4 as possible without being frozen.  Samples collected were delivered to the laboratory upon collection.

 

In-situ Measurement

3.4.16             YSI Professional Plus Multifunctional Meter was used for water in-situ measures, which automates the measurements and data logging of water temperature, dissolved oxygen & dissolved oxygen saturation, pH unit and salinity.  Before each round of monitoring, the instrument was checked in accordance with the manufactory manual instruction to sure it valid.

 

3.4.17             A portable Hach 2100Q Turbidimeter was used for in-situ turbidity measurement. The turbidity meter is capable of measuring turbidity in the range of 0 – 1000 NTU.  StablCal® Standards 10NTU and 100NTU are used for calibration of the instrument before and after measurement.

 

3.4.18             All in-situ measurement equipment were calibrated by HOKLAS accredited laboratory of three month interval. The valid certificates are shown in Appendix D.

 

3.4.19             A flow probe brand named FP211 Global Flow Probe was used to carry out stream/river flow velocity measurement.  The measurement was conducted between water surface and 0.1m below at each water quality monitoring location.

 

Laboratory Analysis

3.4.20             All water samples were analyzed the concentration of Suspended Solids (SS) as specified in the EM&A Manual by a local HOKLAS-accredited testing laboratory (ALS Technichem (HK) Pty Ltd HOKLAS registration no. 66).  SS analysis was determined by the laboratory upon receipt of the water samples using APHA Standard Methods 2540D.  HOKLAS-accreditation certificate of the testing laboratory is provided in Appendix E.  The SS determination is started within 48 hours upon receipt, which is well within the required maximum sample storage time of the parameter of 7 days.

 

3.5                       Data Management and Data QA/QC Control

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

 

3.5.2                 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.

 

3.5.3                 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                             Baseline Monitoring Results

4.1                       General

4.1.1                 The baseline monitoring schedules are presented in Appendix F and the monitoring results are presented in the following sub-sections.

 

4.2                       Results of Air Quality Monitoring

4.2.1                 Baseline air quality monitoring was carried out at ASR-1, ASR-2 and ASR-3 during the period between 25 April 2018 and 9 May 2018.  The results for 24-hour and 1-hour TSP are summarized in Tables 4-1 to 4-3.  The detailed 24-hour TSP data are shown in Appendix G.

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

Date

24-hour TSP (mg/m3)

1-hour TSP (mg/m3)

Date

Start Time

1st Measurement

2nd Measurement

3rd Measurement

25/4/2018

136

25/4/2018

9:36

87

92

110

26/4/2018

101

26/4/2018

9:31

272

255

241

27/4/2018

71

27/4/2018

9:37

350

276

249

28/4/2018

131

28/4/2018

9:33

129

137

137

29/4/2018

69

29/4/2018

10:08

159

156

154

30/4/2018

113

30/4/2018

9:54

86

96

103

01/5/2018

48

01/5/2018

9:34

123

128

131

02/5/2018

59

02/5/2018

9:24

74

80

86

03/5/2018

38

03/5/2018

9:28

89

84

90

04/5/2018

128

04/5/2018

9:21

121

120

126

05/5/2018

63

05/5/2018

8:51

80

78

71

06/5/2018

19

06/5/2018

9:43

68

69

76

07/5/2018

63

07/5/2018

9:34

58

60

53

08/5/2018

62

08/5/2018

9:36

79

83

82

Average

(Range)

78

(19-136)

Average

(Range)

124

(53-350)

 

Table 4-2         Summary of 24-hour and 1-hour TSP Monitoring Results – ASR-2

Date

24-hour TSP (mg/m3)

1-hour TSP (mg/m3)

Date

Start Time

1st Measurement

2nd Measurement

3rd Measurement

25/4/2018

PSF

25/4/2018

9:29

85

95

106

26/4/2018

74

26/4/2018

9:34

221

214

211

27/4/2018

83

27/4/2018

9:44

255

208

172

28/4/2018

65

28/4/2018

9:39

119

121

128

29/4/2018

60

29/4/2018

9:49

100

108

114

30/4/2018

45

30/4/2018

10:02

80

84

93

01/5/2018

41

01/5/2018

9:57

63

66

74

02/5/2018

68

02/5/2018

9:34

62

63

68

03/5/2018

41

03/5/2018

9:37

91

92

87

04/5/2018

59

04/5/2018

9:30

94

92

94

05/5/2018

45

05/5/2018

8:58

85

77

66

06/5/2018

36

06/5/2018

9:54

46

53

62

07/5/2018

45

07/5/2018

9:40

50

51

53

08/5/2018

41

08/5/2018

9:45

78

84

79

09/5/2018

47

 

 

 

 

 

Average

(Range)

54

(36-83)

Average

(Range)

101

(46-255)

Remarks: PSF – Power Supply Failure

 


Table 4-3         Summary of 24-hour and 1-hour TSP Monitoring Results – ASR-3

Date

24-hour TSP (mg/m3)

1-hour TSP (mg/m3)

Date

Start Time

1st Measurement

2nd Measurement

3rd Measurement

25/4/2018

76

25/4/2018

9:22

88

94

108

26/4/2018

64

26/4/2018

9:45

195

180

166

27/4/2018

70

27/4/2018

9:59

98

65

104

28/4/2018

46

28/4/2018

9:39

108

117

132

29/4/2018

54

29/4/2018

10:11

90

107

114

30/4/2018

40

30/4/2018

10:06

89

85

102

01/5/2018

37

01/5/2018

10:10

63

65

71

02/5/2018

43

02/5/2018

9:41

58

61

64

03/5/2018

PSF

03/5/2018

9:49

85

86

87

04/5/2018

55

04/5/2018

9:41

83

81

82

05/5/2018

41

05/5/2018

9:03

76

82

77

06/5/2018

20

06/5/2018

10:09

49

54

60

07/5/2018

32

07/5/2018

9:46

49

47

51

08/5/2018

33

08/5/2018

9:54

73

74

71

09/5/2018

29

 

 

 

 

 

Average

(Range)

46

(20-76)

Average

(Range)

88

(47-195)

Remarks: PSF – Power Supply Failure

 

4.2.2                 During the baseline monitoring period, no construction activities under the project were observed.  However, other dust source from the road traffic of Sha Ling Road and Lin Ma Hang Road was observed at ASR-1 and ASR-2 respectively since they are road side stations.  The dust source from the road traffic is considered as the background condition as it already existed before the project commencement.

 

4.2.3                 The meteorological data during the baseline monitoring period are summarized in Appendix H.

 

Action/Limit Levels for Air Quality

4.2.4                 Following the criteria shown in Table 2-8 of this report, the proposed Action and Limit Levels for 24-hour and 1-hour TSP are listed in Table 4-4.

Table 4-4         Action and Limit Levels for Air Quality Monitoring for all Stations

Monitoring Station

Action Level (mg /m3)

Limit Level (mg/m3)

1-hour TSP

24-hour TSP

1-hour TSP

24-hour TSP

ASR-1

331

181

500

260

ASR-2

316

165

500

260

ASR-3

307

160

500

260

Note:    1-hour & 24-hour TSP Action Level = (Baseline × 1.3 + Limit level)/2

 

4.3                       Results of Noise Monitoring

4.3.1                 The baseline noise monitoring was undertaken at CN-1, CN-2, CN-3 and CN-4 form 25 April 2018 to 8 May 2018.  During the noise measurement, a portable wind speed meter was used to check wind speed (m/s) to ensure no wind speed was exceeding 5m/s or gusts exceeding 10m/s and no noise measurement were carried out under rain.  The measurement data are shown in Appendix F and summarized in Table 4-5 to Table 4-8. 

Table 4-5         Summary of Noise Monitoring Results (dB(A)) – CN-1

Date

Daytime (07:00 – 19:00)

Restricted Hours (19:00 – 07:00 next day)

(#)LAeq30mins

Observation

1st

(#)LAeq5mins

2nd

(#)LAeq5mins

3rd

(#)LAeq5mins

Observation

25-Apr-18

67.4

Normal

55.8

55.7

54.6

Normal

26-Apr-18

66.0

Normal

64.4

67.4

63.7

Normal

27-Apr-18

66.9

Normal

57.7

55.2

58.1

Normal

28-Apr-18

71.3

Dog Barking

74.3

68.0

70.6

Dog Barking

29-Apr-18*

54.7

Normal

63.8

60.8

65.8

Normal

30-Apr-18

75.5

Dog Barking

57.0

63.5

57.1

Normal

1-May-18*

53.0

Normal

74.2

63.4

57.5

Dog Barking

2-May-18

72.3

Barking

62.2

63.4

58.6

Normal

3-May-18

70.0

Dog Barking

63.4

52.5

60.7

Normal

4-May-18

76.1

Vehicle Noise

70.2

67.2

62.6

Normal

5-May-18

72.9

Dog Barking

52.5

53.9

66.5

Normal

6-May-18*

52.8

Normal

63.9

62.9

58.5

Dog Barking

7-May-18

79.2

Vehicle Noise

72.5

58.2

62.7

Dog Barking

8-May-18

68.5

Normal

72.8

57.6

73.6

Dog Barking

Remarks:

(#) Sound level meter set at CN-1 is made free-field measurement, façade correction (+3dB(A)) has added according to acoustical principles and EPD guidelines

(*) Sunday or Public Holiday

Note:

Figures refer to the measurement recorded at the designated station during the entire baseline period for general reference.

 

Table 4-6         Summary of Noise Monitoring Results (dB(A)) – CN-2

Date

Daytime (07:00 – 19:00)

Restricted Hours (19:00 – 07:00 next day)

(#)LAeq30mins

Observation

1st

(#)LAeq5mins

2nd

(#)LAeq5mins

3rd

(#)LAeq5mins

Observation

25-Apr-18

65.1

Normal

63.4

64.4

64.2

Normal

26-Apr-18

64.3

Normal

65.3

65.3

56.4

Normal

27-Apr-18

67.5

Normal

62.2

63.3

64.5

Normal

28-Apr-18

67.1

Normal

60.4

61.0

61.3

Normal