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Job
No.: TCS00975/18 |
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CEDD Contract Agreement No.
EDO/04/2018 - Environmental Team for Cross Bay Link, Tseung Kwan O |
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Baseline Monitoring Report |
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Prepared For Civil
Engineering and Development Department |
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Quality Index |
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Date |
Reference No. |
Prepared By |
Approved By |
11 February 2019 |
TCS00975/18/600/R0027v3 |
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Martin Li Environmental
Consultant |
TW
Tam Environmental Team Leader |
Version |
Date |
Description |
1 |
16 November 2018 |
First Submission |
2 |
9 January 2019 |
1st Revision |
3 |
11 February 2019 |
2nd Revision |
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executive summary
ES.01
Action-United
Environmental Services & Consulting (AUES) was awarded the Civil Engineering
and Development Department (CEDD) Contract
Agreement
No. EDO/04/2018 - Environmental Team for Cross Bay Link, Tseung
Kwan O (hereinafter
called ¡§the Contract Agreement).
ES.02 According
to the Approved Environmental
Monitoring & Audit (EM&A) Manual, air quality, noise
and water quality monitoring are required
to be conducted during the construction phase of Cross Bay Link, Tseung Kwan O (hereinafter called
¡§the Project¡¨). As
part of the EM&A programme, baseline monitoring
is required to determine the ambient environmental conditions. Prior to the commencement of construction
work of the Project, baseline water quality monitoring at
the all designated stations was carried out from 21st September 2018 to 22nd
October 2018. In addition, the air quality at the interim alternative locations
was carried out from 30th October 2018 to 12th
November 2018 while noise baseline monitoring was carried out from 29th
October 2018 to 13th November 2018.
ES.03 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 data obtained. 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 Approved EM&A Manual.
ES.04 Results of the derived Action
and Limit Levels for air quality, construction noise and water quality are
given in Tables ES-1, ES-2 and ES-3 as follows.
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 |
|
Interim Alternative Location ¡V Lohas Park Phase 2A (AM4) |
278 |
NA |
500 |
NA |
Interim Alternative Location ¡V the
Project site office (AM5) |
NA |
190 |
NA |
260 |
Remarks: Air quality
monitoring will be resumed at the designated locations AM1, AM2 and AM3 once
they are available and permission are granted. |
Table ES-2 Action
and Limit Levels of Construction Noise Monitoring
Monitoring Location |
Action Level |
Limit Level in dB(A) (Leq30min) |
Time Period: 0700-1900 hours on normal
weekdays |
||
Interim Alternative Location ¡V Lohas Park Phase 2A (CNMS-5) |
When
one or more documented complaints to be received |
75 |
Remarks: (i)
Construction noise monitoring
will be resumed at the designated locations CNMS-1, CNMS-2, CNMS-3 and CNMS4 once
they are available and permission are granted; (ii)
The designated locations CNMS-1,
CNMS-2 and CNMS-3 are located at residential building which are still under construction, Limit
Level of 75dB(A) will be adopted until they are occupied; (iii)
The designated location
CNMS-4 is located at planned
school and still not yet to construction. When the school occupied and operated, Limit Level of 70dB(A) should be adopted
and should be reduced to 65dB(A) during examination period; and (iv)
If construction
works are required during restricted hours, the conditions stipulated in the construction noise
permit issued by the Noise Control Authority shall be followed. |
Table ES-3 Action
and Limit Levels of Water Quality Monitoring
Monitoring Station |
Depth Average of SS (mg/L) |
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Action Level |
Limit Level |
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CC1 |
7.8 |
OR
120% of upstream control station at the same tide of the same day (Control Station C3 at Ebb tide and Control Station C4 at Flood tide),
whichever is higher |
9.3 |
OR
130% of upstream control station at the same tide of the same day (Control Station C3 at Ebb tide and Control Station C4 at Flood tide),
whichever is higher |
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CC2 |
9.0 |
9.2 |
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CC3 |
8.2 |
9.0 |
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CC4 |
13.8 |
15.4 |
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CC13 |
8.9 |
10.3 |
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SWI1 |
8 mg/L |
10 mg/L |
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Monitoring Location |
Dissolved
Oxygen (mg/L) |
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Depth
Average of Surface and Mid-depth |
Bottom |
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Action
Level |
Limit Level |
Action
Level |
Limit Level |
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CC1 |
5.8 |
5.7 |
5.3 |
5.2 |
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CC2 |
5.8 |
5.7 |
5.3 |
5.1 |
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CC3 |
5.5 |
5.4 |
4.9 |
4.7 |
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CC4 |
5.7 |
5.7 |
5.5 |
5.4 |
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CC13 |
5.6 |
5.5 |
5.3 |
5.2 |
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SWI1 |
5.4 |
4.8 |
5.1 |
5.0 |
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Monitoring Location |
Depth Average of Turbidity (NTU) |
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Action Level |
Limit Level |
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CC1 |
5.8 |
OR
120% of upstream control station at the same tide of the same day (Control Station C3 at Ebb tide and Control Station C4 at Flood tide),
whichever is higher |
6.0 |
OR
130% of upstream control station at the same tide of the same day (Control Station C3 at Ebb tide and Control Station C4 at Flood tide),
whichever is higher |
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CC2 |
4.6 |
5.5 |
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CC3 |
4.8 |
5.4 |
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CC4 |
6.1 |
7.1 |
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CC13 |
6.0 |
6.3 |
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SWI1 |
6.1 |
7.1 |
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Notes:
(a)
For
DO, non-compliance of water quality limits occurs when monitoring result is
lower than the limits
(b)
For SS and turbidity, in order to better utilize the baseline data in
the derivation of water quality limit, the water quality limits were set as 95/99%-ile of
baseline data OR 120/130% of upstream control station at the same tide of the
same day, whichever is higher.
(c)
For
SS and turbidity, non-compliance of the water quality limits occurs when
monitoring result is higher than the limits.
(d)
For
SS at SWI1, the Action and Limit Level were set according the approved EM&A
Manual based on the assessment criteria of the WSD salt water intake.
ES.05 In cases where exceedance of these criteria occurs,
actions should be carried out in accordance with the Event Action Plan as showed
in the Approved EM&A Manual.
Table of Contents
1.0 Introduction 1
Background 1
Report Structure 1
2.0 Summary of Baseline Monitoring Requirement 3
General 3
Monitoring Parameters 3
Monitoring Locations 3
Monitoring Frequency and Period 4
Monitoring Equipment 5
Derivation of Action/Limit (A/L) Levels 6
Event Action Plan 7
3.0 Baseline monitoring methodology 8
General 8
Location of Baseline Monitoring 8
Monitoring Equipment of Baseline Monitoring 8
Monitoring Procedure 9
Meteorological Information 12
Equipment Calibration 12
Data Management and Data QA/QC Control 12
4.0 Baseline Monitoring Results
13
General 13
Results of Air Quality Monitoring 13
Results of Background Noise Monitoring 13
Results of Marine Water Quality Monitoring 14
Discussion and Recommendations 15
5.0 Conclusions and Recommentations
17
Conclusions 17
Recommendations 18
List
of TABLES
Table
2-1 Summary of Baseline Monitoring
Parameters
Table
2-2 Designated Air Quality
Monitoring Location recommended in EM&A Manual
Table
2-3 Designated Construction
Noise Monitoring Location Recommended in
Table
2-4 Proposed Alternative
Monitoring Location
Table
2-5 Location of Water
Quality Monitoring Station
Table
2-6 Derivation of Action and
Limit Levels for Air Quality
Table
2-7 Derivation of Action
and Limit Levels for Construction Noise
Table
2-8 Derivation of Action
and Limit Levels for Water Quality
Table
3-1 Air Quality Monitoring
Equipment
Table
3-2 Construction Noise
Monitoring Equipment
Table
3-3 Water Monitoring
Equipment
Table
3-4 Testing Method and
Reporting Limit of the Chemical Analysis
Table
4-1 Summary of 1-hour TSP
and 24-Hr Monitoring Results ¡V Alternative Monitoring Location AM4 (1-Hour TSP)
and AM5 (24-Hour TSP)
Table
4-2 Action and Limit
Levels for Air Quality Monitoring
Table
4-3 Summary of Noise
Monitoring Results ¡V Alternative Monitoring Location CNMS-5
Table
4-4 Action / Limit Levels
of Construction Noise Monitoring
Table
4-5 Water Depths of Water
Quality Monitoring Stations Summary
Table
4-6 Summaries of Maine
Water In-situ Measurement Results
Table
4-7 Summaries of Suspended
Solids Analysis Results
List
of Appendices
Appendix A Project
site layout plan
Appendix B Designated
Monitoring locations and Alternative Air Noise Monitoring Location
Appendix C calibration
certificates of Equipment and the Accreditation Laboratory Certificate
Appendix D Baseline
monitoring schedule
Appendix E Database
for 24-hour TSP Data of Air Quality
Appendix F Database
for Noise Measurement Data
Appendix G Database
for Marine Water Quality Monitoring Data with Laboratory Result
Appendix H Meteorological
Data during baseline monitoring period
Appendix I Event
Action Plan (Air Quality and Construction Noise)
Appendix J Tidal
Pattern of Junk Bay from Hong Kong Tidal Stream Prediction System
1.01
Cross Bay Link, Tseung Kwan O is a
designated project under Part I of Schedule 2 to the EIAO (Cap. 499) and Environmental Permit No. EP-459/2013 is granted from
EPD for construction and operation
phases of the Project. The Project commenced on 10 August 2018.
1.02
AUES was awarded the CEDD Contract Agreement No. EDO/04/2018 - Environmental Team for
Cross Bay Link, Tseung Kwan O (hereinafter called ¡§the Service Contract¡¨).
The Services under the Service Contract is to provide environmental monitoring
and audit (EM&A) services for the Works Contracts pursuant to the
requirement of Environmental Team (ET) under the Approved EM&A Manual to
ensure that the environmental performance of the Works Contracts comply with
the requirement specified in the EM&A Manual and EIA Report of Agreement No. CE 43/2008 (HY) Cross Bay
Link, Tseung Kwan O - Investigation and other relevant statutory requirements.
1.03
The Project involved two major infrastructure works
contracts. The scope of works
covered in these works contracts namely Contract 1 and 2 comprises as listed
below. In addition, route-wide
traffic control and surveillance system (TCSS) will be implemented along Cross
Bay Link (CBL) of the Project.
Contract
1 (Contract No. NE/2017/07) ¡V Cross
Bay
Link, Tseung Kwan O - Main Bridge and Associated
Works
(i)
400m section of marine viaducts
of steel deck sections including the Eternal Arch Bridge;
(ii)
600m section of marine viaducts
of concrete deck sections; and
(iii)
An E&M Plantroom and
associated building services and E&M provisions
Contract 2 (Contract No. NE/2017/08) ¡V Cross Bay Link, Tseung Kwan O - Road D9 and Associated Works
(i)
Elevated deck structures along Road D9;
(ii)
A 210m section of cycle track and footpath ramp bridge;
(iii)
A 630m section of noise semi-enclosure covering the
entire length of Road D9, and;
(iv)
Lift, staircase,
modification of existing seawall along Road D9, landscaping and miscellaneous
works.
Contract 3 (Contract No. NE/2017/06) - Lam Tin Tunnel - Traffic Control and
Surveillance System (TCSS) and Associated Works (for portions of Cross Bay
Link)
(i)
Traffic control and surveillance system (TCSS) works
1.04
Action-United Environmental Services &
Consulting (hereinafter referred as
¡§AUES¡¨) has been commissioned as an Environmental Team (hereinafter referred as
¡§the ET¡¨) to implement the relevant EM&A programme in accordance with the approved EM&A
Manual, as well as the associated duties.
1.05
As part of the EM&A programme, baseline
monitoring is required to determine the ambient environmental conditions. Baseline monitoring including air quality, background noise
and water quality were conducted in periods from 21st September 2018
to 13th
November 2018
before construction work of Project commencement.
1.06
This Baseline Monitoring Report presents the details of the
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.
1.07
This Baseline Monitoring 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. 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 Conclusion
and Recommendation
2.01
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.
2.02
This report presents the results obtained during the baseline
monitoring of air quality, background noise and water quality in periods from 21st September 2018 to
13th
November 2018. A summary of the baseline EM&A
requirements for air quality, background noise and water quality monitoring are
presented in the sub-sections below.
2.03
The baseline monitoring programme covers
the following environmental aspects:
• Air Quality;
• Construction Noise; and
• Water Quality
2.04
A summary of baseline monitoring parameters is presented in Table
2-1:
Table 2-1 Summary
of Baseline Monitoring Parameters
Environmental Issue |
Parameters |
Air Quality |
1-hour TSP by Real-Time
Portable Dust Meter; and
24-hour TSP by High Volume Air Sampler. |
Background Noise |
LAeq(30min) for daytime (0700 ¡V 1900) of
normal working day; LAeq(15min) for evening (1900 ¡V 2300), night-time (2300 ¡V 0700
next day) and public holidays (include Sundays) between 0700 and 2300 on all days |
Water Quality |
In-situ measurement
¡V Dissolved Oxygen (DO) concentration (mg/L) & saturation (%), pH,
Salinity (mg/L), Temperature (ºC) and Turbidity (NTU); and Laboratory analysis
¡V SS (mg/L) |
Air Quality and Construction Noise
2.05
According to
the Approved EM&A Manual Section 5.4
and Section 6.3, three (3) representative air sensitive receivers (ASR) and
four (4) representative noise sensitive receivers
were designated as monitoring stations.
The designated air quality and noise monitoring locations are listed in Table
2-2 and Table 2-3, and shown in Appendix B.
Table 2-2 Designated
Air Quality Monitoring Location recommended in
EM&A Manual
ID |
Location
in the EM&A Manual |
Currently Situation |
AM1 |
Tung Wah Group of Hospitals
Aided Primary School & Secondary School |
Not yet
construct |
AM2 |
Lohas Park Stage 2
(Planned Development in Area 86) |
Under
Construction |
AM3 |
Lohas Park Stage 3
(Planned Development in Area 86) |
Under
Construction |
Table 2-3 Designated
Construction Noise Monitoring Location recommended by
EM&A Manual
ID |
Location |
Currently Situation |
CNMS-1 |
Lohas Park Stage
1(Planned Development in Area 86, Package 5) (Southeast facade) |
Under
Construction |
CNMS-2 |
Lohas Park Stage 1
(Planned Development in Area 86, Package 6) (Southeast facade) |
Under
Construction |
CNMS-3 |
Lohas Park Stage 3
(Planned Development in Area 86,Package 11) (West facade) |
Under
Construction |
CNMS-4 |
Tung Wah Group of Hospitals Aided Primary School &
Secondary School (Southwest facade) |
Not yet
construct |
2.06
As observed and confirmed by ET and IEC during the joint site visit on 29th August 2018, the designated
air
quality and noise monitoring
locations are under construction or yet to construct. It is considered that these
designated locations are not appropriate to perform air quality and noise
monitoring. In this regard, alternative locations were proposed as interim arrangement to carry
out air quality and noise monitoring before occupation of the designated
monitoring location. A letter enclosed with the alternative location proposal
and IEC verification (Our Ref: TCS00975/18/300/L0038) was sent to EPD on 19th
October 2018 and the proposal was agreed by EPD.
2.07
The agreed
alternative monitoring locations for baseline
monitoring was carried out are summarized in Table 2-4 and are shown in Appendix B.
Table 2-4 Proposed
Alternative Monitoring Location
Location ID |
Monitoring Parameter |
Location |
AM4 |
1-Hour TSP Air
Quality |
Podium of Lohas Park Phase 2A (Le Prestige) |
AM5 |
24-Hour TSP Air
Quality |
Boundary of Site Office near Junction of Wan Po Road and Wan O Road |
CNMS-5 |
Noise (Leq, L10 & L90) |
Podium of Lohas Park Phase 2A (Le Prestige) |
Remark: Since
24-Hour TSP Air Quality monitoring is not granted at AM4 Lohas
Park Phase 2A, the 24-Hour TSP monitoring was therefore proposed at AM5 which
is located at the boundary of the project site office.
Water Quality
2.08
According to Table
7.1 of the
approved EM&A Manual Section 7.4, two Control
Stations (C3 & C4), six (6) sensitive
receivers (CC1, CC2, CC3, CC4, CC13
& SWI1) and one (1) Gradient station (I1) were
recommended to perform water quality monitoring. Details and
coordinate of these water quality monitoring stations are described in Table
2-5 and the graphical layout plan is shown in Appendix B.
Table 2-5 Location of Water Quality
Monitoring Station
Station |
Coordinates |
Description |
|
Easting |
Northing |
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CC1 |
843201 |
816416 |
Sensitive Receiver ¡V Coral Sites at Chiu Keng Wan |
CC2 |
844076 |
817091 |
Sensitive Receiver ¡V Coral Sites at Junk Bay |
CC3 |
844606 |
817941 |
Sensitive Receiver ¡V Coral Sites at Junk Island |
CC4 |
845444 |
815595 |
Sensitive Receiver ¡V Coral Sites at Fat Tong Chau West |
CC13 |
844200 |
817495 |
Sensitive
Receiver ¡V Coral
Sites at Junk Bay near Chiu Keng Wan |
SWI1 |
845512 |
817442 |
Sensitive Receiver ¡V Tseung Kwan
O Salt Water Intake |
C3 |
843821 |
816211 |
Control Station (Ebb Tide) ¡V within Junk Bay |
C4 |
844621 |
815770 |
Control Station (Flood Tide) ¡V within Junk
Bay |
I1 |
844602 |
817675 |
Gradient Station ¡V between LTT and CBL |
2.09
According
to the Hong Kong Tidal Stream Prediction System operated by the Marine
Department, the marine water will flow into the Junk Bay and Kowloon Bay at
Flood tide while will flow out from the Junk Bay and Kowloon Bay at Ebb tide.
The upstream control station at Flood tide will be the Control Station C4 and
at Ebb tide will be the Control Station C3. The tide pattern in Junk Bay at
both ebb tide and flood tide was illustrated in Appendix J.
2.10
In
case of exceedance was recorded, the results obtained from the upstream control
station (C3 for ebb tide & C4 for flood tide) and the gradient station I1
will be used as appropriate to identify the source(s) of impact.
2.11
The
baseline monitoring should be conducted prior to commencement
of the construction work under the Project. No construction activities are allowed
to be undertaken during the baseline monitoring period. Frequency
and duration of baseline monitoring programme
including air quality, background noise and marine water quality were carried
out in accordance with the approved EM&A Manual Sections 5.5.3, 6.4.1.1 and 7.5.1 and are
listed as below:
Air Quality
2.12
Continuous 24-hour TSP monitoring and 3 times of 1-hour TSP monitoring at
the available
designated or alternative monitoring locations should be carried out daily for at
least 14 consecutive days.
Background Noise
2.13
Continuous
baseline noise monitoring of the A-weighted levels Leq,
L10 and L90 should be carried out
daily for a period of at least two weeks, with a sampling period of 30 minutes
between 0700 and 1900 hours and 15 minutes (as three consecutive Leq(5min)
readings) for evening time (between 1900 and 2300 hours on normal
weekdays), general holidays
including Sundays (between 0700 and 2300 hours) and night-time (between 2300
and 0700 on all days).
Marine Water Quality
2.14
Marine
water quality monitoring at the specified stations as shown in Table
2-5, should be conducted 3 days a week, at mid-flood and mid-ebb tides,
for at least 4 weeks to prior commencement any marine construction activities
such as the pile excavation works for the bridge pier foundations.
The intervals between 2 consecutive sets of monitoring should not less than
36 hours.
Air Quality Monitoring
2.15
The 24-hour and 1-hour TSP levels should 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, sufficient information shall
be submitted to the IEC to prove that the instrument is capable
of achieving a comparable result to the HVAS. 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.
Noise Monitoring
2.16
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.
Marine Water Quality Monitoring
2.17
For
water quality monitoring, the equipment should fulfill the requirement under
the Approved EM&A Manual Section 7.2. The requirement is summarized below:
•
Dissolved Oxygen and Temperature Measuring
Equipment ¡V The instrument should be a portable, weatherproof dissolved oxygen
measuring instrument completed with cable, sensor, comprehensive operation
manuals, and should be operable from a DC power source. It should be capable of
measuring: dissolved oxygen levels in the range of 0-20 mg/L and 0-200%
saturation; and a temperature of 0-45 degrees Celsius. It should have a
membrane electrode with automatic temperature compensation complete with a
cable of not less than 35 m in length. Sufficient stocks of spare electrodes
and cable should be available for replacement where necessary.
•
Turbidity Measurement Equipment ¡V The
instrument shall be a portable, weatherproof turbidity-measuring instrument
complete with comprehensive operation manual. The equipment shall use a DC
power source. It shall have a photoelectric sensor capable of measuring
turbidity between 0-1000 NTU.
•
Salinity Measurement Instrument ¡V A portable salinometer
capable of measuring salinity in the range of 0-40 ppm should be provided for
measuring salinity of the water at each monitoring location.
•
Water Depth Detector ¡V A portable, battery-operated echo sounder
should be used for the determination of water depth at each designated
monitoring station. A detector affixed to the bottom of the works boat, if the
same vessel is to be used throughout the monitoring programme,
is preferred.
•
Positioning Device ¡V hand-held or boat-fixed type digital Global
Positioning System (GPS) with way point bearing indication or other equipment
instrument of similar accuracy, should be provided and used during water
quality monitoring to ensure the monitoring vessel is at the correct location
before taking measurements.
•
Water Sampling Equipment ¡V A water sampler, consisting of a
transparent PVC or glass cylinder of not less than two liters, which can be
effectively sealed with cups at both ends, should be used. The water sampler
should have a positive latching system to keep it open and prevent premature
closure until released by a messenger when the sampler is at the selected water
depth.
2.18
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
Tables
2-6, 2-7 and 2-8 respectively.
Table 2-6 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 ¡Ñ 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 ¡Ñ 1.3 + Limit
level)/2 |
500
mg/m3 |
For
baseline level > 384 mg/m3: Action
level = Limit level |
Table 2-7 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.
Table 2-8 Derivation
of Action and Limit Levels for Water Quality
Parameter |
Action Level |
Limit Level |
SS in mg/L (depth-averaged) (a) (c)(d) |
CC1, CC2, CC3, CC4 and CC13 95%-ile of baseline data, or 120% of
upstream control station at the same tide of the same day, whichever is
higher. SWI1 only 8mg/L |
CC1, CC2, CC3, CC4 and CC13 99%-ile of baseline data, or 130% of
upstream control station at the same tide of the same day, whichever is
higher. SWI1 only 10mg/L |
DO in mg/L (b) |
Surface and Middle 5%-ile of baseline data for surface and middle layer Bottom 5%-ile of baseline data for bottom layers |
Surface and Middle 4mg/L or 1%-ile
of baseline for surface and middle layer Bottom 2mg/L or 1%-ile
of baseline data for bottom layer |
Turbidity in NTU (depth-averaged) (a)
(c) (d) |
CC1, CC2, CC3, CC4, CC13 and SWI1 95%-ile
of baseline data, or 120% of upstream control
station at the same tide of the same day, whichever is higher. |
CC1, CC2, CC3, CC4, CC13 and SWI1 99%-ile
of baseline data, or 130% of upstream control
station at the same tide of the same day, whichever is higher. |
Notes: (a)
¡§Depth-averaged¡¨ is
calculated by taking the arithmetic means of reading of all three depths. (b)
For DO,
non-compliance of the water quality limits occurs when monitoring result is
lower than the limits. (c)
For
SS and turbidity, in order to better utilize the baseline data in the
derivation of water quality limit, the water quality limits were set as
95/99%-ile of baseline data OR 120/130% of upstream
control station at the same tide of the same day, whichever is higher. (a)
For SS and turbidity, non-compliance of
the water quality limits occurs when monitoring result is higher than the
limits. (b)
For
SS at SWI1, the Action and Limit Level were set according the approved
EM&A Manual based on the assessment criteria of the WSD salt water
intake. |
2.19
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 I.
3.01
Baseline monitoring of air quality, background noise and marine
water quality were conducted from 21st September 2018 to 13th
November 2018. During the
baseline monitoring period, no construction activities were carried out under
the Project.
Air
Quality
3.02
Baseline air quality monitoring, 1-hour TSP measurement at AM4 from
30th October 2018 to 12th November 2018 and 24-hour TSP measurement at
AM5 were undertaken from 30th
October 2018 to 13th November 2018. The monitoring locations of AM4 and AM5
were shown in Table 2-1 and Appendix
B.
Background
Noise
3.03
Baseline 24-Hour noise monitoring was undertaken at alternative location CNMS-5 from 29th October 2018 to 13th November 2018.
The location of CNMS-5 was shown in Table 2-2 and Appendix B.
Water
Quality
3.04
Baseline marine water quality monitoring was undertaken at the all
designated monitoring stations from 21st September 2018 to 22nd
October 2018. The detailed
information of monitoring stations was shown in Tables 2-3 and Appendix
B.
Air
Quality
3.05
Equipment
used for baseline air quality monitoring is listed in Table 3-1.
Table 3-1 Air
Quality Monitoring Equipment
Equipment |
Model |
|
24-hour
TSP |
High Volume Air Sampler |
TISCH High
Volume Air Sampler, HVAS Model TE-5170 |
Calibration Kit |
TISCH Model
TE-5025A |
|
1- hour TSP |
Portable Dust Meter |
Laser Dust Monitor Sibata LD-3B Laser Dust Monitor |
3.06
Equipment
used for baseline noise monitoring is listed in Table 3-2.
Table 3-2 Construction
Noise Monitoring Equipment
Equipment |
Model |
Integrating Sound Level Meter |
B&K
Type 2238 |
Calibrator |
B&K
Type 4231 |
Portable Wind Speed Indicator |
Anemometer
AZ Instrument 8908 |
Water
Quality
3.07
Equipment used for marine water quality monitoring proposed by ET was
verified by IEC prior of baseline monitoring work commencement. The detail of equipment used for
baseline monitoring is listed in Table 3-3 as below.
Table 3-3 Water
Monitoring Equipment
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 |
Thermometer & DO meter |
YSI
ProDSS Digital Sampling System Water Quality Meter |
pH meter |
YSI
ProDSS Digital Sampling System Water Quality Meter |
Turbidimeter |
YSI
ProDSS Digital Sampling System Water Quality Meter |
Salinometer |
YSI
ProDSS Digital Sampling System Water Quality Meter |
Sample Container |
High density polythene
bottles (provided by laboratory) |
Storage Container |
¡¥Willow¡¦ 33-litter plastic
cool box with Ice pad |
3.08
The procedures to conduct air quality, noise
and marine water quality monitoring are summarized in following sub-sections.
Air
Quality
1-hour TSP
3.09
Operation of the 1-hour TSP meter would be to follow
manufacturer¡¦s Operation and Service Manual.
3.10
The 1-hour TSP monitor, brand named ¡§Model AM510 SidePakTM
Personal Aerosol Monitor/ Sibata LD-3B Laser Dust monitor Particle Mass
Profiler & Counter¡¨ 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 programme
to facilitate data collection, analysis and reporting.
24-hour TSP
3.11
The equipment used for 24-hour TSP measurement is the High
Volume Air Sampler (hereinafter the ¡§HVAS¡¨) 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
6-day mechanical timer, and
g.
A
power supply of 220v/50 Hz
3.12
For HVAS for 24-hour TSP monitoring, the HVAS is mounted in a
metallic cage with a top for protection and is sat on the existing ground. The flow rate of the HVAS between 0.6m3/min
and 1.7m3/min would 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 would be used for 24-Hour TSP monitoring and would be supplied by
laboratory. The general procedures
of sampling are described as below:-
A horizontal platform with appropriate support to secure the
samples against gusty wind should be provided;
No two samplers should be placed less than 2 meters apart;
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;
A minimum of 2 meters of separation from any supporting structure,
measured horizontally is required;
Before placing any filter media at the HVAS, the power supply should
be checked to ensure the sampler work properly;
The filter paper should be set to align on the screen of HVAS to
ensure that the gasket formed an air tight seal on the outer edges of the
filter. Then filter holder frame should
be tightened to the filter hold with swing bolts. The holding pressure should be
sufficient to avoid air leakage at the edge.
The mechanical timer should be set for a sampling period of 24
hours (12:00 afternoon to 12:00 afternoon next day). Information will be recorded on the
field data sheet, which should included the sampling
data, starting time, the weather condition at current and the filter paper ID
with the initial weight;
After sampling, the filter paper should be collected and transfer
from the filter holder of the HVAS to a sealed envelope and sent to a local
HOKLAS accredited laboratory for quantifying.
3.13
All the sampled 24-hour TSP filters were kept in normal air
conditioned room conditions, i.e. 70% HR (Relative Humidity) and 25oC,
for six months prior to disposal.
3.14
The HVAS used for 24-hour TSP monitoring was calibrated before the
commencement for sampling, with five-point calibration 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.
Construction
Noise
3.15
As referred to 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 should be used for carrying out the noise
monitoring.
3.16
All noise measurements were performed with the meter set to FAST
response and on the A-weighted equivalent continuous sound pressure level (Leq). Throughout
baseline monitoring period, 24-Hours continuous noise monitoring was conducted
in order to obtained Leq(30min) and three
sets of Leq(5min) measurements for the daytime
(between 07:00-19:00 hours) and evening / mid-night (between 19:00-07:00 hours
next day) respectively.
3.17
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 would 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.
3.18
Immediately prior to and following each noise measurement the
accuracy of the sound level meter would be checked using an acoustic calibrator
generating a known sound pressure level at a known frequency. Measurement results would be accepted as
valid only if internal check the used sound level meter at before and after the
noise measurement to record as ¡Ó0.5dB of the known sound pressure level.
3.19
Noise measurements should not be made in fog, rain, wind with a
steady speed exceeding 5m/s or wind with gusts exceeding 10m/s. The wind speed would be checked with a
portable wind speed meter capable of measuring the wind speed in m/s.
Marine
Water Quality
3.20
Marine water quality monitoring was conducted at all designated locations in accordance with Table 7.1 of the approved EM&A Manual. The
operating and analytical of sampling procedures are described as below:
A Global
Positioning System (GPS) was used to ensure that the correct location was
selected prior to sample collection.
A portable, battery-operated echo sounder was used for the determination
of water depth at each designated monitoring station.
The marine water sampler was 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.
During the sampling, the
sampling container was rinsed to use
a portion of the marine water sample before the water sample is transferred to
the container. Upon sampling
completion, the container was sealed with a screw cap.
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 was recorded on the monitoring field data
sheet.
In-situ measurement including
water temperature, turbidity, dissolved oxygen, salinity, pH
and water depth was recorded at the identified monitoring point. At
each station, marine water samples were 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 were collected when the water depth is
between 3m and 6m. And samples at mid-depth was taken when the water depth is below
3m.
For the in-situ measurement, two consecutive
measurements of sampling depth, temperature, dissolved oxygen, salinity,
turbidity and pH concentration was measured at the sea. The YSI ProDSS Multifunctional Meter was 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.
Marine
water sample was collected by using a water sampler. The high-density polythene
bottles will be filled after the water sample collected from the sea. Before the water sample
being fill into the sampling bottles, the sampling bottles will be
pre-rinsed with the same water sample.
The sampling bottles will then be 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 for the Examination of
Water and Wastewater 19ed 2540D, unless otherwise specified.
3.21
All marine
water in-situ measurement equipment used are
calibrated at three months interval.
3.22
Before each round of monitoring, the
dissolved oxygen probe was calibrated by wet bulb method; a zero check in
distilled water was performed with the turbidity and salinity probes. The
turbidity probe was checked with a standard solution of known NTU and known value of the pH standard solution were used to check the accuracy of pH value before each monitoring day.
Laboratory Analysis
3.23
All water samples included the duplicate samples, was tested with
chemical analysis as specified in the EM&A Manual by a
HOKALS accredited laboratory - ALS Technichem (HK) Pty Ltd. The
chemicals analysis method and reporting limit show Table 3-4.
Table 3-4 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 |
1 mg/L |
Note:
1.
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.
3.24
The determination works was start within 24 hours after collection
of the water samples or within the holding time as advised by the laboratory.
3.25
The meteorological information including wind direction, wind speed,
humidity and temperature etc. during baseline monitoring was extracted
from the closest Tseung Kwan
O Hong Kong
Observatory Station. Moreover, the
data of rainfall and air pressure were extracted from King¡¦s Park Station.
3.26
For
marine water quality monitoring, tidal information was referred to tide gauge
at Tai Miu Wan.
3.27
Valid calibration
certificates of monitoring equipment/instruments including air, noise &
water and the HOKLAS-Accreditation
certificate of the testing laboratory respectively are attached in Appendix
C.
3.28
The baseline monitoring data were handled by the
ET¡¦s in-house data
recording and management system.
3.29
The monitoring data recorded in the equipment were downloaded
directly from the equipment at each monitoring day or after completion of
baseline measurement. 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.
3.30
If monitoring parameters require laboratory analysis, the local
laboratory would follow the QA/QC requirements as set out under the HOKLAS
scheme for the relevant laboratory tests.
4.01
The baseline monitoring schedules of air quality, background noise
and marine water quality are presented in Appendix D and the monitoring
results are detailed in the following sub-sections.
4.02
Baseline 1-hour TSP from 30th October 2018 to 12th
November 2018 and 24-hour TSP monitoring were carried out from 30th
October 2018 to 13th November 2018. The results for 1-hour and 24-hour TSP
are summarized in Table 4-1. The
24-hour TSP data are shown in Appendix E.
AM5 |
AM4 |
|||||
24-hour TSP (mg/m3) |
1-hour TSP (mg/m3) |
|||||
Date |
Meas. Result |
Date |
Start Time |
1st
Meas. |
2nd
Meas. |
3rd
Meas. |
30-Oct-18 |
93 |
30-Oct-18 |
9:34 |
29 |
27 |
28 |
31-Oct-18 |
86 |
31-Oct-18 |
9:46 |
26 |
27 |
30 |
1-Nov-18 |
93 |
1-Nov-18 |
9:38 |
42 |
39 |
41 |
2-Nov-18 |
45 |
2-Nov-18 |
9:52 |
37 |
33 |
34 |
3-Nov-18 |
42 |
3-Nov-18 |
9:30 |
31 |
28 |
30 |
4-Nov-18 |
70 |
4-Nov-18 |
9:30 |
38 |
35 |
37 |
5-Nov-18 |
71 |
5-Nov-18 |
9:42 |
52 |
54 |
52 |
6-Nov-18 |
* |
6-Nov-18 |
9:36 |
50 |
42 |
47 |
7-Nov-18 |
67 |
7-Nov-18 |
9:24 |
44 |
42 |
40 |
8-Nov-18 |
121 |
8-Nov-18 |
9:34 |
55 |
61 |
58 |
9-Nov-18 |
166 |
9-Nov-18 |
9:49 |
53 |
56 |
58 |
10-Nov-18 |
69 |
10-Nov-18 |
9:26 |
51 |
53 |
49 |
11-Nov-18 |
71 |
11-Nov-18 |
9:18 |
50 |
48 |
52 |
12-Nov-18 |
94 |
12-Nov-18 |
9:41 |
49 |
59 |
57 |
13-Nov-18 |
197 |
-- |
-- |
-- |
-- |
-- |
Average (Range) |
92 (42 ¡V 197) |
Average (Range) |
43 (26 ¡V 61) |
*24-Hour
TSP failure due to power supply issue
Action/Limit Levels of Air Quality
4.03
Following the criteria shown in Table 2-6 of this report,
the proposed Action and Limit Levels for 24-hour and 1-hour TSP are listed in Table
4-2.
Table 4-2 Action
and Limit Levels for 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 |
|
AM4 |
278 |
NA |
500 |
NA |
AM5 |
NA |
190 |
NA |
260 |
Note: 1-hour & 24-hour TSP Action Level = (Average Baseline Result ¡Ñ 1.3
+ Limit level)/2
4.04
The
baseline continuous noise monitoring was undertaken from 29th
October 2018 to 13th November 2018. The measurement data are shown in Appendix
F and summarized in Table 4-3.
Table 4-3 Summaries
of Noise Monitoring Results ¡V Alternative Monitoring Location CNMS-5
Time Period |
Mean |
Max |
Min |
Normal
Daytime 0700-1900 ¡V Leq(30min) |
64.7 |
69.4 |
59.7 |
Restricted
Hours 0700-1900 holiday ¡V Leq(30min) |
60.7 |
68.1 |
56.6 |
Restricted
Hours 1900-2300 ¡V Leq(15min) |
59.4 |
65.7 |
55.6 |
Restricted
Hours 2300-0700 next day ¡V Leq(15min) |
56.1 |
62.2 |
53.2 |
Remark: The sound meter was set
up at the Podium of Lohas Park Phase 2A (Le Prestige)
with 1m façade
Action/
Limit Levels of Construction Noise
4.05
According to the criteria shown in Table 2-7 of this report,
the proposed Action/Limit
levels of construction noise monitoring station are illustrated in Table
4-4.
Table 4-4 Action
/ Limit Levels of Construction Noise Monitoring
Monitoring Location |
Action Level |
Limit Level (Leq30min) |
Time Period: 0700-1900 hours
on normal weekdays |
||
CNMS-5 |
When
one or more documented complaints are received |
75 dB(A) |
Remarks: If works are to be carried out during
restricted hours, the conditions stipulated in the construction noise
permit issued by the Noise Control Authority have to be followed. |
4.06
Since the designated locations CNMS-1, CNMS-2, CNMS-3 and CNMS-4
are currently unavailable to carry out noise monitoring, the construction noise
monitoring will be resumed at these designated monitoring locations once they
are available. Limit Level
of 75dB(A) will be adopted for the impact noise
monitoring at CNMS-1,
CNMS-2 & CNMS-3. For designated
location CNMS-4 which is located at planned school, Limit Level of 70dB(A) for normal school day and Limit Level of 65dB(A) for
examination period will be adopted for the impact noise monitoring when the
school is occupied.
4.07
Four weeks of baseline water quality monitoring at nine (9) designated
monitoring stations were performed as between 21st September 2018 and 22nd October 2018.
The summary of water depth recorded at each designated monitoring
station presents in Table 4-5.
Table 4-5 Water
Depths of Water Quality Monitoring Stations Summary
Monitoring Station |
Status |
Water Depth, (m) |
Co-ordnance |
|||
Min |
Max |
Ave. |
East |
North |
||
CC1 |
Sensitive Receiver |
6.4 |
9.3 |
8.0 |
843201 |
816416 |
CC2 |
Sensitive Receiver |
11 |
13.1 |
12.0 |
844076 |
817091 |
CC3 |
Sensitive Receiver |
8.6 |
9.9 |
9.1 |
844606 |
817941 |
CC4 |
Sensitive Receiver |
1.6 |
4.3 |
2.7 |
845444 |
815595 |
CC13 |
Sensitive Receiver |
7.2 |
8.9 |
7.9 |
844200 |
817495 |
SWI1 |
Sensitive Receiver |
3.6 |
4.9 |
4.1 |
845512 |
817442 |
C3 |
Control Station ¡V Ebb Tide |
14.2 |
16.4 |
15.4 |
843821 |
816211 |
C4 |
Control Station ¡V Flood Tide |
14.8 |
17 |
16.2 |
844621 |
815770 |
I1 |
Gradient Station |
9.3 |
10.7 |
9.9 |
844602 |
817675 |
4.08
In-situ measurements results including ¡§Dissolved Oxygen¡¨ and ¡§Turbidity¡¨ are summarized in Tables 4-6. Detailed monitoring results of in-situ
measurements are shown in Appendix G.
Table 4-6 Summaries
of Marine Water In-situ Measurement Results
Summary
of Results Conditions |
CC1 |
CC2 |
CC3 |
CC4 |
CC13 |
SWI1 |
C3 |
C4 |
I1 |
Dissolved
Oxygen ¡V Depth Average of Surface & Mid-depth (mg/L) |
|||||||||
5%-ile |
5.8 |
5.8 |
5.5 |
5.7 |
5.6 |
5.4 |
N/A |
N/A |
N/A |
1%-ile |
5.7 |
5.7 |
5.4 |
5.7 |
5.5 |
4.8 |
N/A |
N/A |
N/A |
Average |
6.5 |
6.3 |
6.3 |
6.2 |
6.2 |
6.2 |
6.2 |
6.2 |
6.2 |
Min |
5.7 |
5.6 |
5.4 |
5.7 |
5.5 |
4.7 |
5.6 |
5.6 |
5.7 |
Max |
8.2 |
7.6 |
7.9 |
7.0 |
7.4 |
9.5 |
7.5 |
7.5 |
7.5 |
Dissolved Oxygen ¡V Bottom
Depth (mg/L) |
|||||||||
5%-ile |
5.3 |
5.3 |
4.9 |
5.5 |
5.3 |
5.1 |
N/A |
N/A |
N/A |
1%-ile |
5.2 |
5.1 |
4.7 |
5.4 |
5.2 |
5.0 |
N/A |
N/A |
N/A |
Average |
6.0 |
5.8 |
5.5 |
5.9 |
5.7 |
5.9 |
5.8 |
5.8 |
5.6 |
Min |
5.2 |
5.0 |
4.6 |
5.4 |
5.2 |
5.0 |
5.1 |
5.1 |
4.9 |
Max |
6.8 |
6.4 |
6.2 |
6.8 |
6.3 |
7.5 |
6.4 |
6.4 |
6.5 |
Turbidity ¡V Depth Average (NTU) |
|||||||||
95%-ile |
5.8 |
4.6 |
4.8 |
6.1 |
6.0 |
6.1 |
N/A |
N/A |
N/A |
99%-ile |
6.0 |
5.5 |
5.4 |
7.1 |
6.3 |
7.1 |
N/A |
N/A |
N/A |
Average |
3.5 |
3.3 |
3.4 |
4.5 |
3.9 |
3.9 |
4.2 |
3.9 |
3.5 |
Min |
1.9 |
1.8 |
1.9 |
2.9 |
2.2 |
2.2 |
2.5 |
2.5 |
1.8 |
Max |
6.0 |
5.8 |
5.6 |
7.3 |
6.3 |
7.3 |
6.5 |
6.3 |
5.6 |
N/A: Not
applicable
4.09
Laboratory analysis result of ¡§Suspended Solids (SS)¡¨ is
summarized in Tables 4-7.
Laboratory data reports are shown in Appendix G.
Table 4-7 Summaries
of Suspended Solids Analysis Results
Summary
of Results Conditions |
CC1 |
CC2 |
CC3 |
CC4 |
CC13 |
SWI1 |
C3 |
C4 |
I1 |
Suspended Solids ¡V Depth Average (mg/L) |
|||||||||
95%-ile |
7.8 |
9.0 |
8.2 |
13.8 |
8.9 |
12.3 |
N/A |
N/A |
N/A |
99%-ile |
9.3 |
9.2 |
9.0 |
15.4 |
10.3 |
15.8 |
N/A |
N/A |
N/A |
Average |
5.5 |
5.2 |
4.5 |
7.5 |
6.0 |
6.7 |
6.2 |
6.0 |
5.0 |
Min |
1.7 |
1.3 |
1.0 |
3.0 |
1.9 |
2.0 |
2.4 |
1.8 |
1.0 |
Max |
9.8 |
9.2 |
9.2 |
15.8 |
10.8 |
16.8 |
9.3 |
8.8 |
9.9 |
N/A: Not
applicable
Remark: SS result of
SWI1 Mid-Flood Bottom on 26 Sep 2018 and of CC13 Mid-Ebb Bottom on 22 Oct 2018
were discarded from the calculation due to abnormal high result
obtained.
Possible
Influence of Seasonal Changes
4.10
The baseline air quality monitoring was conducted from 30th October 2018 to 13th November 2018 which most of the monitoring were
conducted during
Hong Kong dry seasons. The baseline
data collected therefore represent the baseline air quality of the dry season
immediately prior to commencement of the Project. The data obtained may not reflect the
air quality conditions of wet seasons in Hong Kong which are normally different.
4.11
The baseline marine quality monitoring was conducted from 21st
September 2018 to 22nd October 2018 which reflect typical water quality at the monitoring
locations during wet seasons (April to October). The baseline
DO, SS and turbidity conditions at the monitoring locations may differ from dry
season especially during rainy days and in particular under high tide flow
conditions.
Possible
Influence of Other Construction Projects
4.12
During the air quality and noise baseline monitoring at interim
alternative monitoring locations,
there are other on-going construction works carried out nearby (e.g. at the
designated air and noise monitoring locations) which may influence the baseline
and impact monitoring at the
interim alternative monitoring location.
4.13
Therefore,
it is recommended to regularly review the air quality and marine water quality
baseline conditions, in particular during season changes and after the
designated monitoring locations are occupied. The environmental performance criteria
may need to be re-established if it is evident that the baseline conditions
have changed significantly. An
updated baseline data should then be sought for re-establishment of the updated
environmental performance criteria for Event and Action Plan to be smoothly implemented.
5.01
The baseline air quality, noise and marine water monitoring were undertaken
during the period from 21st
September 2018 to 13th November 2018 at the agreed monitoring location. During the baseline monitoring, there
were no construction activities undertaken under this Project.
5.02
Based on the baseline monitoring results, the recommended
environmental performance criteria for air quality, construction noise and
water quality are summarized as follows:
Recommended Action & Limit Levels of Air Quality |
||||
Monitoring Station |
Action Level (mg /m3) |
Limit Level (mg/m3) |
||
1-hour TSP |
24-hour TSP |
1-hour TSP |
24-hour TSP |
|
Alternative Location ¡V Lohas Park Phase 2A (AM4) |
278 |
NA |
500 |
NA |
Interim Alternative Location ¡V the
Project site office (AM5) |
NA |
190 |
NA |
260 |
Remarks: Air quality
monitoring will be resumed at the designated locations AM1, AM2 and AM3 once
they are available and permission are granted. |
Recommended
Action & Limit Levels of Construction Noise |
||
Monitoring Location |
Action Level |
Limit Level in dB(A) (Leq30min) |
Time Period: 0700-1900 hours on normal
weekdays |
||
Alternative Location ¡V Lohas Park Phase 2A (CNMS-5) |
When
one or more documented complaints to be received |
75 |
Remarks: (i)
Construction noise monitoring
will be resumed at the designated locations CNMS-1, CNMS-2, CNMS-3 and CNMS4 once
they are available and permission are granted; (ii)
The designated locations
CNMS-1, CNMS-2 and CNMS-3 are residential building which are still under construction, Limit
Level of 75dB(A) will be adopted until they are occupied; (iii)
The designated location
CNMS-4 is located at planned
school and still not yet to construction. When the school occupied and operated, Limit Level of 70dB(A) should be
adopted and should be reduced to 65dB(A) during examination period; and (iv)
If
construction works are required during restricted hours, the conditions
stipulated in the construction noise permit issued by the
Noise Control Authority shall be followed. |
Monitoring Station |
Depth Average of SS (mg/L) |
|||||
Action Level |
Limit Level |
|||||
CC1 |
7.8 |
OR
120% of upstream control station at the same tide of the same day (Control Station C3 at Ebb tide and Control Station C4 at Flood tide),
whichever is higher |
9.3 |
OR
130% of upstream control station at the same tide of the same day (Control Station C3 at Ebb tide and Control Station C4 at Flood tide)
, whichever is higher |
||
CC2 |
9.0 |
9.2 |
||||
CC3 |
8.2 |
9.0 |
||||
CC4 |
13.8 |
15.4 |
||||
CC13 |
8.9 |
10.3 |
||||
SWI1 |
8 mg/L |
10 mg/L |
||||
|
||||||
Monitoring Location |
Dissolved
Oxygen (mg/L) |
|||||
Depth
Average of Surface and Mid-depth |
Bottom |
|||||
Action
Level |
Limit Level |
Action
Level |
Limit Level |
|||
CC1 |
5.8 |
5.7 |
5.3 |
5.2 |
||
CC2 |
5.8 |
5.7 |
5.3 |
5.1 |
||
CC3 |
5.5 |
5.4 |
4.9 |
4.7 |
||
CC4 |
5.7 |
5.7 |
5.5 |
5.4 |
||
CC13 |
5.6 |
5.5 |
5.3 |
5.2 |
||
SWI1 |
5.4 |
4.8 |
5.1 |
5.0 |
||
Monitoring Location |
Depth Average of Turbidity (NTU) |
|||||
Action Level |
Limit Level |
|||||
CC1 |
5.8 |
OR
120% of upstream control station at the same tide of the same day (Control Station C3 at Ebb tide and Control Station C4 at Flood tide)
, whichever is higher |
6.0 |
OR
130% of upstream control station at the same tide of the same day (Control Station C3 at Ebb tide and Control Station C4 at Flood tide)
, whichever is higher |
||
CC2 |
4.6 |
5.5 |
||||
CC3 |
4.8 |
5.4 |
||||
CC4 |
6.1 |
7.1 |
||||
CC13 |
6.0 |
6.3 |
||||
SWI1 |
6.1 |
7.1 |
||||
Notes:
(a)
For
DO, non-compliance of water quality limits occurs when monitoring result is
lower than the limits
(b)
For
SS and turbidity, in order to better utilize the baseline data in the
derivation of water quality limit, the water quality limits were set as 95/99%-ile of baseline data OR 120/130% of upstream control
station at the same tide of the same day, whichever is higher.
(c)
For
SS and turbidity, non-compliance of the water quality limits occurs when
monitoring result is higher than the limits.
(d)
For
SS at SWI1, the Action and Limit Level were set according the approved EM&A
Manual based on the assessment criteria of the WSD salt water intake.
5.03
The baseline air quality and noise monitoring was conducted during
dry season (November to March) while baseline marine water quality was
conducted during typical wet season (April to October) in Hong Kong. It is
important to note that influence of seasonal changes should be taken into
account when interpreting monitoring data obtained.
5.04
In addition, since some of the designated air and noise monitoring
locations located near the interim alternative air and noise monitoring
locations are still under construction, the baseline air quality and noise
monitoring conducted may be influenced by the construction work carried out
nearby.
5.05
Review of the baseline conditions may need to be conducted
regularly, in particular during seasonal changes. If the changes in baseline
conditions are evident, the environmental performance criteria should be
re-established by agreement of the ER and IEC and submitted for EPD endorsement.