1.1.1. Development of Anderson Road Quarry
Site (ARQ) project is to provide land and the associated infrastructures for
the proposed land uses at the existing Anderson Road Quarry Site at the
North-eastern of East Kowloon according to the final Recommended Outline
Development Plan. ARQ project involved three major infrastructures work
contracts namely Contract 1, 2 and 3.
1.1.2.
The scope of works under Contract 3 - Road Improvement Works and
Pedestrian Connectivity Facilitates Work Phase 2A (Contract No. NE/2017/03)
comprises as below and the location of the Project is shown Figure 1.1.
(i)
Road
Improvement Works (RIW) -
a)
RIW
1- at junction of New Clear Water Bay Road and Shun Lee Tsuen Road including
the road widening works at New Clear Water Bay Road, modification of existing
subway structure and provision of noise mitigation measures;
b)
RIW
2- at junction of Clear Water Bay Road and On Sau Road, including the provision
of U-turn facility and noise mitigation measures; and
c)
RIW
3- at junction of Sau Mau Ping Road and Lin Tak Road, construction of bridge
above Tseung Kwan O Road, provision of loading and unloading bays along Lin Tak
Road and noise mitigation measures.
(ii)
Construction
of elevated walkways, escalators and lift towers with associated staircases and
lifts for pedestrian connectivity facilities;
(iii)
Bus-bus
interchange public toilet;
(iv)
Associated
landscaping works, and
(v)
Provision
of Barrier-Free Access Facilities at Subway KS27.
1.1.3.
In accordance with Clause 3.3 stated in the Environmental Permit (no.:
EP-513/2016), Four hard copy and one electronic copy of the Baseline Monitoring
Report shall be submitted to the Director at least 2 weeks before the
commencement of construction of the project.
1.1.4.
In accordance with Section 11.2.1 of the Project Environmental
Monitoring and Audit (EM&A) Manual, the Baseline Environmental Monitoring
Report should be prepared and submitted within 10 working days after completion
of the baseline monitoring works.
1.2.
1.2.1.
The purpose of the baseline monitoring is to review the baseline
conditions of air quality, noise level and water quality along the Project
boundary, and to establish baseline levels for air quality, noise and water
quality in accordance with the EM&A Manual. These levels would be used as
the basis for assessing environmental impact and compliance during construction
stage of the corresponding component the Project
1.2.2. This baseline monitoring report
presents the baseline monitoring requirements, methodologies, monitoring results and determination of the action and limit
levels for each monitoring parameter at EIGHT designated air quality monitoring stations, FIVE designated noise monitoring stations and
FOUR designated water quality monitoring stations as described in the
EM&A Manual.
2.1.1 In accordance
with the Project EM&A Manual, baseline 1-hour TSP levels at EIGHT air quality
monitoring stations should be established by conducting baseline 1-hour TSP
monitoring for at least consecutive 14 days prior to the commencement of the
construction work. The 1-hour TSP sampling shall be done at least three times
per day at each monitoring station.
2.1.2 The baseline air
quality monitoring at EIGHT monitoring stations were conducted during the
baseline monitoring period from 13 August 2018 to 29 August 2018 and the relevant findings are summarized in this
report. The baseline monitoring schedule is shown in Appendix A.
2.1.3 Due to hoisting of
typhoon signal No. 3, the baseline air quality monitoring on 14 August 2018 was
rescheduled to 27 August 2018.
2.1.4 Due to EPD security
concern and unable to access the monitoring station LTR_AMS-2 (EPD Landfill
Site Office) on Public Holiday. The baseline air quality monitoring at
LTR_AMS-2 on 19 and 26 August 2018 was rescheduled to 28 and 29 August 2018
respectively.
2.1.5 The baseline air
quality monitoring of these days were rescheduled until having 14 days baseline
monitoring data.
2.2.1 The 1-hour TSP
air quality monitoring was performed by using portable direct reading dust
meters at each designated monitoring station. The brand and model of the
equipment are given in Table 2.1.
Table 2.1 Air Quality
Monitoring Equipment
|
Equipment
|
Brand
and model
|
Series
Number
|
|
Portable
direct reading dust meter
|
Met
One BT- 645
|
R22586
X19295
X19296
X19297
X19298
X19299
|
|
Met
One AEROCET 831
|
W14016
W15448
W15449
W16848
|
Remark: Portable direct reading dust meter Met One
831 W15449 started to use on 20 August 2018.
2.2.2 The calibration
certificate and certificate of comparison check with High Volume Sampler of the
air quality monitoring equipment listed in Table
2.1 can refer to Appendix B.
2.3.1 Given some of the
original proposed air quality monitoring locations were either rejected or not
favourable for monitoring, fine adjusted monitoring location was therefore
proposed (which is (a) at the site boundary or such locations close to the
major dust emission source; (b) close to the sensitive receptors; and (c) take
into account the prevailing meteorological conditions) based on the procedure
under S1.5 of Appendix D2 of the General Technical Requirements of
Environmental Monitoring. The detail and information of the monitoring stations
for baseline air quality monitoring conducted are presented in Table 2.2 and shown in Figures 2.1 and 2.2.
Table 2.2 Baseline Air
Quality Monitoring Stations Location
|
Monitoring
Station ID
|
Monitoring
Location
|
Level
(in terms of
no. of floor)
|
|
NCWBR_AMS-1 1
|
Shun Lee Fire Station
|
2/F Roof
|
|
NCWBR_AMS-2 2
|
Shun Lee Estate Lee Hang House
|
G/F
|
|
NCWBR_AMS-3 3
|
Shun Lee Disciplined Services Quarters (Block 6)
|
4/F podium
|
|
NCWBR_AMS-4 4
|
Sienna Garden
|
G/F
|
|
NCWBR_AMS-5 5
|
Shun Chi Court Shun Fung House
|
Roof
|
|
LTR_AMS-1 6
|
St Edward's Catholic Primary School
|
G/F
|
|
LTR_AMS-2
|
Environmental
Protection Department's Restored Landfill Site Office
|
G/F
|
|
LTR_AMS-3
|
Po Tat Estate Tat Kai House
|
3/F podium
|
Remarks 1: NCWBR_AMS-1 recommended under EM&A manual
is surrounded by boundary wall and occupied by planter and emergency vehicle
parking area inside the Fire Station which is considered as not representative
/ suitable for air quality monitoring and not feasible for installation of
monitoring equipment. A fine adjusted monitoring location was therefore
proposed, where is at the roof of the Fire Station.
Remarks 2: As advised by the management office of Shun
Lee Estate Lee Hang House, the permission of access could not be obtained from
designated monitoring locations proposed in the EM&A manual, a fine
adjustment of location at the boundary of Shun Lee Estate Lee Hang House was
therefore proposed.
Remarks 3: The management office of Shun Lee Disciplined
Services Quarters prefers conducting the monitoring at the podium level at 4/F
facing New Clear Water Road, where can minimize the disturbance to the
residents. A fine adjustment of location was therefore proposed for baseline monitoring.
Remarks 4: The recommended monitoring location
NCWBR_AMS-4 under EM&A manual is behind the boundary and fence wall which
is considered as not representative / suitable for air quality monitoring for
the upper floors of the Sienna Garden. A fine adjustment of monitoring location
was therefore proposed to represent Sienna Garden.
Remarks 5: The recommended monitoring location
NCWBR_AMS-5 under EM&A manual is located at the edge of roof top without
proper fencing and protection. Due to the safety concern on working at height,
a fine adjustment of location was therefore proposed.
Remarks 6: As permission of access could not be obtained
from St. Edward's Catholic Primary School for conducting monitoring at the
recommended monitoring location under EM&A manual, a fine adjustment of
location at the boundary of St. Edward's Catholic Primary School was therefore
proposed.
2.4.1 The monitoring
parameters, frequency and duration of air quality monitoring are summarized in Table
2.3
Table 2.3 Air Quality Monitoring Parameters, Frequency and Duration
|
Monitoring Period
|
Duration
|
Sampling Parameter
|
Frequency
|
|
Baseline Monitoring
|
At least 14 consecutive days
prior to the commissioning of the construction works
|
1-hour TSP
|
3 times per day
|
2.5.1 Measuring
Procedures
(a)
Check the calibration period of portable direct
reading dust meter prior to monitoring (The direct reading dust meter was
calibrated at 2-years interval and checked with High Volume Sampler (HVS)
yearly, details refer to Section 2.5.2)
(b)
Record the site condition near / around the
monitoring stations.
(c)
Install the portable direct reading dust meter to
the monitoring location.
(d)
Slide the power switch to turn the power on.
(e)
Check of portable direct reading dust meter to
ensure the equipment operation in normal condition.
(f)
Select the period of measurement to 60mins.
(g)
Check and set the correct time.
(h)
Select the appropriate unit display for the
equipment.
(i)
Slide the power switch to turn the power off when
the monitoring period ended (3 times 1 hour TSP monitoring per day).
(j)
Uninstall the portable direct reading dust meter
(k)
Collected the sampled data for analysis.
(l)
Remark: Procedures (c) to (h) may be different
subject to the brands and models of portable direct reading dust meter
2.5.2
Maintenance and Calibration
(a)
The direct reading dust meter was calibrated at
2-years interval and checked with High Volume Sampler (HVS) yearly to determine
the accuracy and validity of the results measured.
(b)
Checking of direct reading dust meter will be carried
out in order to determine the conversion factor between the direct reading dust
meter and the standard equipment, HVS. The comparison check is to be considered
valid based on correlation coefficient checked by HOKLAS laboratory
2.5.3
Wind data
Hong Kong Observatory (HKO) meteorological information is widely
accepted to be used in various environmental monitoring practices within HKSAR
due to its professional quality and precision. Therefore, the daily wind data
including Prevailing Wind Direction (degrees) and Mean Wind Speed (km/h) were
obtained from HKO Automatic Weather Station to serve as the representative data
for meteorological condition during monitoring, given the overall Project
location is divided into three separate works section and the air quality
monitoring stations are located at different elevated ground. The representative
wind data from Tateˇ¦s Cairn HKO Automatic Weather Station and Tseung Kwan O HKO
Automatic Weather Station were obtained covering the 1-hr TSP monitoring
periods. The wind data were extracted and shown in Appendix D.
2.6
Results and Observations
2.6.1 The baseline 1-hour TSP
monitoring were carried out from 13 August 2018 to 29 August 2018 for consecutive 14 days and the weather
were mostly sunny with traces of rainfall. Major dust sources were from nearby
traffic emissions.
2.6.2 The baseline monitoring results for 1-hour
TSP are summarized in Table 2.4
respectively. Detailed air quality monitoring results are presented in Appendix C.
Table 2.4 Summary of 1-hour TSP Baseline Monitoring Results
|
Parameter
|
Monitoring Location
|
Average (µg˘Am3)
|
Range (µg˘Am3)
|
|
1-hour TSP Level in µg˘Am3
|
NCWBR_AMS-1
|
52.9
|
13.4 - 127.2
|
|
NCWBR_AMS-2
|
49.8
|
14.8 - 106.3
|
|
NCWBR_AMS-3
|
58.3
|
6.3 - 126.1
|
|
NCWBR_AMS-4
|
48.6
|
10.6 - 99.3
|
|
NCWBR_AMS-5
|
30.8
|
2.6 - 76.0
|
|
LTR_AMS-1
|
34.0
|
7.8 - 113.6
|
|
LTR_AMS-2
|
47.8
|
4.8 - 110.7
|
|
LTR_AMS-3
|
54.0
|
11.9 - 138.2
|
2.7
Action and Limit Levels
2.7.1 The Action and
Limit Levels for air quality impact monitoring were based on the criteria
adopted from the EM&A Manual as presented in Table 2.5.
Table 2.5 Derivation of Action and Limit Levels for Air Quality
|
Parameters
|
Action Level
|
Limit Level
|
|
1-hour TSP
Level in Łgg/m3
|
For baseline level ≤ 384Łgg/m3, Action level =
(baseline level * 1.3 + Limit level)/2;
For baseline level > 384Łgg/m3, Action level = Limit
level
|
500 Łgg/m3
|
2.7.2
The derived Action and Limit levels are presented in Table 2.6.
Table 2.6 Derived
Action and Limit Levels for Air Quality
|
Parameter
|
Monitoring
Station
|
Action
Level (µg˘Am3)
|
Limit
Level (µg˘Am3)
|
|
1-hour TSP
Level in µg˘Am3
|
NCWBR_AMS-1
|
284.4
|
500.0
|
|
NCWBR_AMS-2
|
282.4
|
500.0
|
|
NCWBR_AMS-3
|
287.9
|
500.0
|
|
NCWBR_AMS-4
|
281.6
|
500.0
|
|
NCWBR_AMS-5
|
270.0
|
500.0
|
|
LTR_AMS-1
|
272.1
|
500.0
|
|
LTR_AMS-2
|
281.1
|
500.0
|
|
LTR_AMS-3
|
285.1
|
500.0
|
3
NOISE
MONITORING
3.1.1 In accordance with the EM&A
Manual, the baseline noise monitoring at FIVE monitoring stations shall be
carried out daily for a period of at least two weeks
3.1.2 The baseline
noise monitoring at FIVE monitoring stations were conducted during the
monitoring period from 13 August 2018 to 2 September 2018
and the relevant findings are summarized in this report. The baseline
monitoring schedule is shown in Appendix
A.
3.1.3
Due to hoisting of typhoon signal No. 3, the
baseline noise monitoring on 14 August 2018 (all time period) was rescheduled
to 27 August 2018. The baseline noise monitoring on 27 August 2018 (1900-2300
hours and 2300-0700 hours of next day) was further rescheduled to 30 August
2018 due to the adverse weather condition.
3.1.4 Due to adverse
weather condition, the baseline noise monitoring on 22 August 2018 from
1900-2300 hours was rescheduled to 28 August 2018. The baseline noise
monitoring on 28 August 2018 was further rescheduled to 31 August 2018 due to
the adverse weather condition.
3.1.5 Due to adverse
weather condition, the baseline noise monitoring at NMC04 and NMC05 on 23
August 2018 from 1900-2300 hours was rescheduled to 29 August 2018. The baseline
noise monitoring at NMC04 and NMC05 on 29 August 2018 from 1900-2300 hours was
further rescheduled to 1 September 2018 due to the adverse weather condition.
3.1.6 Due to adverse
weather condition, the baseline noise monitoring on 26 August 2018 (2300-0700
hours of next day) was rescheduled to 1 September 2018.
3
3.1
3.2
3.2.1 Noise monitoring was
performed using sound level meter at
the designated monitoring locations. The sound level meters shall comply with the International Electrotechnical Commission Publications
651:1979 (Type 1) and
804:1985 (Type 1)
specifications.
Acoustic calibrator shall
be deployed to check the sound level meters at a known sound pressure level. Brand and model of the equipment is given in Table
3.1.
Table 3.1 Noise Monitoring Equipment
|
Equipment
|
Brand and
Model
|
Series Number
|
|
Integrated Sound Level Meter
|
Larson Davis LxT
|
0003737
0004796
|
|
B&K2238
|
2160277
|
|
HONGLIM HLES-01
|
201692136
|
|
Acoustic Calibrator
|
Rion NC-73
|
10707358
|
|
Acoustic Calibrator
|
Larson Davis CAL200
|
13098
13128
13437
|
3.2.2
The calibration certificates of the noise monitoring equipment are
attached in Appendix B.
3.3
3.3.1 Given some of the
original proposed noise monitoring locations were not favourable for
monitoring, fine adjusted monitoring location was therefore proposed (which is
still within the boundary of the designated noise sensitive receivers). In
accordance with the EM&A Manual, the noise monitoring stations for baseline noise
monitoring is presented
in Table 3.2 and shown in Figures 3.1 and
3.2.
Table 3.2
Baseline Noise
Monitoring Stations
|
Monitoring Station ID
|
Monitoring Location
|
Measurement Type
|
Level
(in terms of no. of floor)
|
|
NMC01 1
|
Kei Shun Special School
|
Facade
|
G/F
|
|
NMC02
|
Shun Lee Disciplined
Services Quarters Block
6
|
Facade
|
3/F podium
|
|
NMC03 2
|
Sienna Garden Block 6
|
Free-field
|
G/F
|
|
NMC04 3
|
Po Tat Estate Tat Kai House
|
Free-field
|
3/F podium
|
|
NMC05
|
Hong Wah Court Block B
Yee Hong House
|
Facade
|
G/F
|
Remarks 1: The recommended
monitoring location NMC01 under EM&A manual would not be accessible for
baseline noise monitoring from 1900 to 0700 hours of next day. The fine
adjusted location located between the recommended monitoring location and proposed
construction site was proposed, which is accessible from 1900 to 0700 hours of
next day.
Remarks 2: The recommended
monitoring location NMC03 under EM&A manual is behind the boundary and
fence wall which is considered as not representative / suitable for noise
quality monitoring for the upper floors of the Sienna Garden. A fine adjustment
of monitoring location was therefore proposed to represent the boundary
condition of Sienna Garden.
Remarks 3: The recommended
monitoring location NMC04 under EM&A manual is located at
semi-enclosed/enclosed area. As such, it was considered as not suitable for
noise monitoring. A fine adjustment of monitoring location was therefore
proposed at the open area of 3/F Podium of Po Tat Estate Tat Kai House for
baseline monitoring.
3.4
Monitoring Parameters,
Frequency and Duration
3.4
3.4.1 The
monitoring parameters, frequency and duration
of
noise monitoring
are
summarized in Table 3.3.
Table 3.3 Baseline Noise Monitoring
Parameters, Frequency and Duration
|
Monitoring
Period
|
Duration
|
Measurement Parameter
|
Measurement Period
|
Frequency
|
|
Baseline Monitoring
|
Consecutive days of at least 2
weeks before commencement of major construction works
|
A-weighted levels Leq,
L10 and L90
Including 30 minutes (six
consecutive Leq(5min) readings) for (i), (ii) and (iii)
|
(i) between 0700 and 1900 hours;
(ii) between 1900 and 2300 hours; and
(iii) between 2300 to 0700 hours of next day
|
Daily
|
3.5
3.5.1
Monitoring Procedure
(a)
The monitoring station shall normally be at a point 1m from the
exterior of the sensitive receiverˇ¦s building façade and be at a position 1.2m
above the ground.
(b)
Facade
measurements were made at the monitoring locations.
For free-field measurement, a correction factor of +3 dB (A) would be applied.
(c)
The
battery condition was checked to ensure the correct functioning of the meter.
(d)
Parameters such
as frequency weighting, the time weighting and the measurement time were set as follows:
(i)
Frequency weighting: A time weighting: Fast
(ii)
Time measurement: Daily measurement of
A-weighted levels Leq, L10 and L90 shall be
conducted for at least two weeks. Daily measurement periods should include: (i)
between 0700 and 1900 hours; (ii) between 1900 and 2300 hours; and (iii)
between 2300 to 0700 hours of next day. Each of the daily sampling periods
shall include 30 minutes (six consecutive Leq(5min) readings).
(e)
Prior
and after to the noise measurement, the meter was checked using the acoustic calibrator for 94dB (A) at 1000 Hz. If the difference in the calibration level before and after measurement was more
than ˇÓ1 dB (A),
the measurement would be considered invalid and repeat of noise measurement would be required after re-calibration or repair of the equipment.
3.5.2
Maintenance and
Calibration
(a)
The microphone head of the sound level meter was cleaned with soft cloth at regular intervals.
(b)
The sound level meter and calibrator were calibrated
at yearly intervals.
3.6.1 The baseline noise monitoring were carried out from 13 August 2018 to 2
September 2018 for recording over two weeks monitoring
data and the weather were mostly sunny with traces of rainfall. During the
baseline monitoring period, no construction activities were observed. The major noise source was traffic noise around the
monitoring stations (especially Clear Water Bay Road near NMC03).
3.6.2 The baseline noise monitoring results are
summarized in Table 3.4
respectively. Detailed noise monitoring results are presented in Appendix E.
Table 3.4 Summary of Baseline Noise
Monitoring Results
|
Monitoring Station
|
0700-1900 hrs on normal weekdays
|
0700-2300 hrs on holidays (including Sundays); and 1900-2300 hrs on
all days
|
2300-0700 hrs of all days
|
|
Leq (30min), dB(A)
|
Leq (5min), dB(A)
|
|
Average
|
Range
|
Average
|
Range
|
Average
|
Range
|
|
NMC01
|
69.3
|
67.8 - 70.5
|
69.0
|
61.2 - 71.8
|
66.6
|
60.6 - 71.6
|
|
NMC02
|
72.0
|
70.3 - 73.1
|
66.3
|
63.3 - 69.6
|
68.6
|
62.4 - 71.9
|
|
NMC03
|
78.2
|
77.1 - 79.5
|
77.9
|
73.3 - 82.1
|
73.8
|
65.8 - 79.7
|
|
NMC04
|
66.6
|
63.7 - 70.3
|
64.0
|
61.9 - 71.8
|
62.1
|
58.7 - 66.0
|
|
NMC05
|
61.8
|
59.2 - 64.8
|
59.8
|
56.5 - 73.7
|
57.9
|
53.6 - 62.0
|
|
Remark: Each
of the daily 30 minutes sampling period include six consecutive Leq
(5min) reading
|
3.6
3.7
3.7.1 The Action and Limit Levels of noise monitoring have been set in accordance with the criteria specified in the updated EM&A Manual as shown in Table 3.5 below.
3.7.2
Not used
Table 3.5 Action and Limit Levels for
Construction Noise
|
Monitoring Station
|
Action Level
|
Limit Level (dB(A))
|
|
0700-1900 hrs on normal weekdays
|
0700-2300 hrs on holidays (including Sundays); and 1900-2300 hrs on
all days 2
|
2300-0700 hrs of all days 2
|
|
NMC01
|
When one documented complaint is received
|
65 / 70 1
|
60 / 65 / 70 3
|
45 / 50 / 55 3
|
|
NMC02
|
75
|
|
NMC03
|
75
|
|
NMC04
|
75
|
|
NMC05
|
75
|
Remark 1: Limit
level of NMC01 - Kei Shun Special School reduce to 65 dB (A) during examination
periods if any.
Remark 2: Construction
noise during restricted hours is under the control of Noise Control Ordinance Limit
Level to be selected based on Area Sensitivity Rating.
Remark 3: Limit
Level for restricted hour monitoring shall act as reference level only. Investigation
would be conducted on CNP compliance if exceedance recorded during restricted
hour noise monitoring period.
4
WATER QUALITY MONITORING
4.1
Monitoring
Requirements
1.
1.1.
1.1.1.
4.1.1 In accordance with the Project EM&A
Manual, baseline water monitoring shall be carried out at FOUR designated
monitoring stations, three days per week, for at least 4 weeks prior to the
commencement of construction works. Temporal and spatial variations should be
taken into account. The interval between 2 sets of monitoring should not be
less than 36 hours. Replicate in-situ measures should be carried out in each
sampling event. The levels of dissolved oxygen (DO), turbidity and pH shall be
measured in situ while suspended solids (SS) is determined by laboratory
analysis at all the designated monitoring stations.
4.1.2 The baseline water quality monitoring was
conducted during the baseline monitoring period from 13 August 2018 to 7 September 2018 and the relevant findings are summarized
in this report.
4.2
Monitoring
Equipment
1.1.2.
4.2.1 Water quality monitoring was performed
using multifunctional meter and weatherproof turbidity-measuring instrument at
the monitoring locations. They are capable of measuring:
ž
a dissolved oxygen level in the range of 0-20mg/L and 0-200%
saturation
(Detection Limit:
0.01mg/L and 0.1%)
ž
a temperature of 0-45 degree Celsius (Detection Limit: 0.1 degree
Celsius)
ž
turbidity level between 0-1000NTU (Detection Limit: 0.01NTU)
ž
salinity in the range of 0-70ppt (Detection Limit: 0.01ppt)
ž
pH value in range of 0.0-14.0 (Detection Limit: 0.01units)
4.2.2 Brand and model of the equipment are given
in Table 4.1.
Table 4.1 Water
Quality Monitoring Equipment
|
Equipment
|
Brand and model
|
Series Number
|
|
Multifunctional Meter
|
YSI Professional Plus
|
14K100322
17F100236
|
|
Turbid meter
|
Xin Rui WGZ-3B
|
1403009
1309192
|
4.2.3 Due to low water level as mentioned in
Section 6.4.3 of the EIA report, bucket sampler (Approximate 1L) will be use
instead of water sampler in order to obtain surface water sample without
disturb the stream sediment and collect representative results.
4.2.4 The calibration certificates of the water
quality monitoring equipment are attached in Appendix B.
4.3
Monitoring
Locations
4.3.1 The water quality monitoring stations for
baseline water quality monitoring is presented in Table 4.2 and shown in Figures
4.1 and 4.2.
Table 4.2 Details of Baseline Water
Quality Monitoring
Stations
|
Inland Water
|
Stations
|
Description
|
Easting
|
Northing
|
|
Channelized nullah across
the Project site
|
E
|
Upstream
Control Station
|
841329
|
821753
|
|
F
|
Downstream Impact Station
|
841469
|
821635
|
|
Ma Yau Tong Stream
|
H
|
Upstream Control Station
|
843008
|
819880
|
|
I
|
Downstream Impact Station
|
842652
|
819573
|
4.4
Monitoring Parameters,
Frequency and Duration
1.1.3.
4.4.1 The monitoring parameters, frequency and
duration of water quality monitoring are summarized in Table 4.3.
4.4.2
The levels of DO, turbidity and pH shall be measured in situ while SS is
determined by laboratory analysis at all the designated monitoring stations.
4.4.3
In association with the water quality parameters, other relevant data
shall also be recorded, such as monitoring location / position, time, water
temperature, salinity, DO saturation, weather conditions, and any special
phenomena underway near the monitoring station.
Table 4.3 Water Quality Monitoring Parameters,
Frequency
|
Monitoring Period
|
Duration
|
Sampling Parameter
|
Frequency
|
Remarks
|
|
Baseline
Monitoring
|
at least 4 weeks
prior to the commencement of construction works
|
Dissolved oxygen
(DO), turbidity, suspended solids (SS) level and pH
|
three days per
week
|
Replicate in-situ
measures for DO, pH and Turbidity.
|
1.1.4.
4.5.1 Monitoring Procedure
(a)
The condition near the monitoring stations shall be observed and
recorded on the data log sheet.
(b)
Check of sensors and electrodes with certified standard solutions
before each use.
(c)
Wet bulb calibration for a DO meter should be carried out before measurement.
(d)
Sample would be taken using bucket sampler at surface level.
(e)
Transfer the sampled water carefully into cleaned water bottles
(2x 500ml) provided by the laboratory at the spot after the collection of the
water sample for the subsequent laboratory Suspended Solid testing.
(f)
Transfer the sampled water from the bucket sampler to the rinsed
water container for in-situ measurement (In case of the in-situ measurement
cannot be carried at spot due to safety and adverse weather condition, sampled
water from the bucket sampler will be transfer to cleaned water bottles
provided by laboratory. Then, In-situ measurement will be conducted at a safe
location which sampled water inside cleaned water bottle will be transfer to
the rinsed water container for in-situ measurement) In-situ measurement shall
be measured in duplicate.
(g)
Parameters including Water Temperature (˘J), pH
(units), Salinity (ppt), DO (mg/L), DO saturation (%) will be measured by the
Multifunctional Meter and Turbidity (NTU) will be measured by turbid meter.
(Water Temperature and Salinity will be measured as reference parameters)
(h)
Record the result on the data log sheet and record
any special finding during / after in-situ measurement.
(i)
The water sample bottles will store in a cool box,
which shall be delivered to HOKLAS laboratory (Pilot Testing Limited) for
further testing to determine the level of SS.
4.5.2 Maintenance and Calibration
(a)
The responses of sensors and electrodes of the
water quality monitoring equipment were cleaned and checked at regular intervals.
(b)
DO meter (Multifunctional Meter) and turbid meter
was certified by a laboratory accredited under HOKLAS or any other
international accreditation scheme, and subsequently re-calibrated at three
monthly intervals.
4.5.3 Laboratory measurement
Analysis of suspended solid will be conducted by a HOKLAS accredited
laboratory, which is Pilot Testing Limited.
4.6.1 The baseline water quality monitoring was
carried out from 13
August 2018 to 7 September 2018 and the weather was mostly sunny with traces of rainfall. During the
baseline monitoring period, no construction activities were observed.
4.6.2 The baseline water quality monitoring
results are summarized in Table 4.4
respectively. Detailed water quality monitoring results are presented in Appendix F.
Table 4.4 Summary
of Baseline Water Quality Monitoring Results
|
Monitoring Station
|
pH
|
DO (mg/L)
|
Turbidity (NTU)
|
SS (mg/L)
|
|
Average
|
Range
|
Average
|
Range
|
Average
|
Range
|
Average
|
Range
|
|
E
|
7.30
|
6.59 - 7.95
|
6.48
|
6.02 - 6.83
|
24.73
|
7.92 - 129.90
|
22.55
|
3.25 - 175.80
|
|
F
|
6.94
|
6.28 - 8.38
|
6.44
|
5.40 - 6.82
|
16.46
|
5.46 - 78.54
|
9.69
|
1.80 - 50.95
|
|
H
|
7.48
|
6.57 - 8.51
|
6.23
|
4.83 - 7.10
|
184.92
|
7.62 - 648.48
|
589.76
|
2.95 - 5650.25
|
|
I
|
7.38
|
6.69 - 8.43
|
6.20
|
5.42 - 6.72
|
132.79
|
7.69 - 894.00
|
102.28
|
2.15 - 748.50
|
Remarks: The
value of <1.0mg/L represents the recorded suspended solid level is under the
minimum laboratory reporting limit of 1.0mg/L.
4.7
Action and Limit Levels
4.7.1 The Action and Limit Levels of water
quality monitoring have been set in accordance with the derivation criteria
specified in EM&A Plan as shown in Table
4.5 below.
Table 4.5 Action and Limit Levels for Water
Quality Monitoring
|
Parameters
|
Action
Level
|
Limit
Level
|
|
Surface DO in mg/L
|
5 percentile (%-ile) of baseline
data
|
4 mg/L or 1%-ile of baseline data
|
|
Surface SS in mg/L
|
95 %-ile of baseline data or 120%
of control stationˇ¦s SS on the same day of measurement
|
25 mg/L or 99 %-ile of baseline
or 130% of control stationˇ¦s SS on the same day of measurement
|
|
Surface Turbidity in NTU
|
95 %-ile of baseline data or 120%
of control stationˇ¦s turbidity on the same day of measurement
|
99 %-ile of baseline or 130% of
control stationˇ¦s turbidity on the same day of measurement
|
|
Surface pH
|
Beyond the range 6.6 to 8.4
|
Beyond the range of 6.5 to 8.5
|
4.7.2
Further review the baseline water quality monitoring data, the action and
limit level will be derived with the following justification:
-
The turbidity and SS level recorded during baseline period at upstream monitoring stations
(Monitoring Station E and H) were higher than downstream monitoring stations
(Monitoring Station F and I) in general (Table
4.6, Table 4.7, Table 4.8 and Table 4.9 refers). The usage of the 120% or 130% of control stationˇ¦s (Upstream
monitoring station) turbidity and SS on the same day of measurement to establish
the action and limit level is not realistic in this case. As such, it is
recommended that upstream monitoring station (Monitoring Station E and H) would
be taken as control reference for exceedance investigation only. Action and
limit level would not be established for upstream monitoring station
(Monitoring Station E and H).
-
Having further reviewed the baseline water
quality monitoring data, it was observed the turbidity and SS level recorded on
5 September 2018 (Maximum Turbidity and SS) at Monitoring Station F and 27
August 2018 (Maximum Turbidity and SS) at Monitoring Station I were out of the
normal range as compared with other data recorded during the baseline
monitoring period. As such, the SS and turbidity data recorded on those dates
would take as outliers to set the Action and Limit Level in order to establish the
representative action and limit levels.
-
The establishment of DO limit level using
1%-ile of baseline data was 5.5mg/L (for Monitoring Station F) and 5.4mg/L (for
Monitoring Station I) which was would be stricter than using 4mg/L to set up DO
limit level and would be a better limit level to safeguard the water quality
monitoring.
-
After the exclusion of abnormal data, the
establishment of SS limit level using 99%-ile of baseline data was 23.8 mg/L at
Monitoring Station F which would be stricter than using 25mg/L as SS limit
level and would be better limit level to safeguard the water quality.
-
After the exclusion of abnormal data, the establishment
of SS action level using 95%-ile of baseline data at Monitoring Station I was
176.3mg/L. As such, the adoption of 25 mg/L as limit level is not realistic
(Action Level > Limit Level) in this case.
-
According to Table 6.1 of EIA Report of the
Project (AEIAR-195/2016) - Summary of Water Quality Objectives for Victoria
Harbour WCZ, the SS annual median for inland water shall not exceed 25 mg/L due
to human activity. Since the average SS level recorded for Station F on 17
August 2018 was about 25.6mg/L which was around the range stated under the WQO,
the data was considered as normal.
-
According to Table 6.4 of EIA Report of the
Project (AEIAR-195/2016), - Summary of Water Quality Monitoring Data for Ma Yau
Tong Stream (Wet Season), the maximum Turbidity and SS level recorded was
255.5NTU and 201.5mg/L respectively. Given the data recorded for Station I on
17 August 2018 and 20 August 2018 was similar to EIA reportˇ¦s data, (i.e. 17
August 2018 - Turbidity: 197.6NTU, SS: 137.1mg/L; 20 August 2018 - Turbidity:
216.1NTU, SS: 208.5mg/L), the data was considered as normal.
4.7.3
The action and limit level were derived and presented in Table 4.10.
Table 4.6 Comparison of turbidity level at upstream and downstream
monitoring station (Channelized nullah across the Project site)
|
Date
|
Monitoring Station
|
Comparison
|
|
Monitoring Station E (Upstream)
|
Monitoring Station F (Downstream)
|
|
Turbidity (NTU)
|
|
13/8/2018
|
8.43
|
5.47
|
Upstream>Downstream
|
|
15/8/2018
|
21.71
|
9.72
|
Upstream>Downstream
|
|
17/8/2018
|
129.90
|
34.79
|
Upstream>Downstream
|
|
20/8/2018
|
14.00
|
8.87
|
Upstream>Downstream
|
|
22/8/2018
|
8.84
|
7.09
|
Upstream>Downstream
|
|
24/8/2018
|
15.87
|
5.46
|
Upstream>Downstream
|
|
27/8/2018
|
20.00
|
6.78
|
Upstream>Downstream
|
|
29/8/2018
|
18.26
|
12.19
|
Upstream>Downstream
|
|
31/8/2018
|
7.99
|
14.07
|
Downstream>Upstream
|
|
3/9/2018
|
7.92
|
6.85
|
Upstream>Downstream
|
|
5/9/2018
|
34.46
|
78.54
|
Downstream>Upstream
|
|
7/9/2018
|
9.39
|
7.73
|
Upstream>Downstream
|
Table 4.7 Comparison of SS level at upstream and downstream monitoring
station (Channelized nullah across the Project site)
|
Date
|
Monitoring Station
|
Comparison
|
|
Monitoring Station E (Upstream)
|
Monitoring Station F (Downstream)
|
|
SS (mg/L)
|
|
13/8/2018
|
6.55
|
3.65
|
Upstream>Downstream
|
|
15/8/2018
|
5.70
|
3.00
|
Upstream>Downstream
|
|
17/8/2018
|
175.80
|
25.55
|
Upstream>Downstream
|
|
20/8/2018
|
8.35
|
6.25
|
Upstream>Downstream
|
|
22/8/2018
|
5.65
|
2.85
|
Upstream>Downstream
|
|
24/8/2018
|
10.30
|
2.95
|
Upstream>Downstream
|
|
27/8/2018
|
5.55
|
5.35
|
Upstream>Downstream
|
|
29/8/2018
|
3.25
|
3.60
|
Downstream>Upstream
|
|
31/8/2018
|
4.30
|
8.45
|
Downstream>Upstream
|
|
3/9/2018
|
8.95
|
1.80
|
Upstream>Downstream
|
|
5/9/2018
|
31.85
|
50.95
|
Downstream>Upstream
|
|
7/9/2018
|
4.30
|
1.85
|
Upstream>Downstream
|
Table 4.8 Comparison of turbidity level at upstream and downstream
monitoring station (Ma Yau Tong Stream)
|
Date
|
Monitoring Station
|
Comparison
|
|
Monitoring Station H (Upstream)
|
Monitoring Station I (Downstream)
|
|
Turbidity (NTU)
|
|
13/8/2018
|
193.43
|
64.32
|
Upstream>Downstream
|
|
15/8/2018
|
61.46
|
26.65
|
Upstream>Downstream
|
|
17/8/2018
|
423.80
|
197.63
|
Upstream>Downstream
|
|
20/8/2018
|
392.95
|
216.08
|
Upstream>Downstream
|
|
22/8/2018
|
53.26
|
49.15
|
Upstream>Downstream
|
|
24/8/2018
|
310.00
|
82.27
|
Upstream>Downstream
|
|
27/8/2018
|
648.48
|
894.00
|
Downstream>Upstream
|
|
29/8/2018
|
69.32
|
13.57
|
Upstream>Downstream
|
|
31/8/2018
|
23.66
|
13.23
|
Upstream>Downstream
|
|
3/9/2018
|
21.65
|
17.99
|
Upstream>Downstream
|
|
5/9/2018
|
13.40
|
10.93
|
Upstream>Downstream
|
|
7/9/2018
|
7.62
|
7.69
|
Downstream>Upstream
|
Table 4.9 Comparison of SS level at upstream
and downstream monitoring station (Ma Yau
Tong Stream)
|
Date
|
Monitoring Station
|
Comparison
|
|
Monitoring Station H (Upstream)
|
Monitoring Station I (Downstream)
|
|
SS (mg/L)
|
|
13/8/2018
|
120.2
|
39.6
|
Upstream>Downstream
|
|
15/8/2018
|
24.1
|
11.5
|
Upstream>Downstream
|
|
17/8/2018
|
459.6
|
137.1
|
Upstream>Downstream
|
|
20/8/2018
|
439.1
|
208.5
|
Upstream>Downstream
|
|
22/8/2018
|
23.0
|
10.8
|
Upstream>Downstream
|
|
24/8/2018
|
254.5
|
44.0
|
Upstream>Downstream
|
|
27/8/2018
|
5650.3
|
748.5
|
Upstream>Downstream
|
|
29/8/2018
|
59.7
|
6.5
|
Upstream>Downstream
|
|
31/8/2018
|
23.2
|
9.6
|
Upstream>Downstream
|
|
3/9/2018
|
17.4
|
6.9
|
Upstream>Downstream
|
|
5/9/2018
|
3.0
|
2.4
|
Upstream>Downstream
|
|
7/9/2018
|
3.4
|
2.2
|
Upstream>Downstream
|
Table 4.10 Derived Action and Limit levels
|
Monitoring Station
|
Surface pH
|
Surface DO (mg/L)
|
Surface
Turbidity (NTU)
|
Surface SS (mg/L)
|
|
Action Level
|
Limit Level
|
Action Level
|
Limit Level
|
Action Level
|
Limit Level
|
Action Level
|
Limit Level
|
|
E
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
|
F
|
Beyond the range 6.6-8.4
|
Beyond the range 6.5-8.5
|
5.8
|
5.5
|
24.4
|
32.7
|
17.0
|
23.8
|
|
H
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
|
I
|
Beyond the range 6.6-8.4
|
Beyond the range 6.5-8.5
|
5.5
|
5.4
|
206.9
|
214.2
|
172.8
|
201.4
|
*Remarks:
The value of 1.0mg/L was taken as the value for
measurement with suspended solid level of <1.0mg/L for Action and Limit
level calculation.
It is recommended that upstream
monitoring station (monitoring station E and H) would be taken as control
reference for exceedance investigation only. Action and limit level would not be
established using the baseline data.
3.8
5.1.1 With respect to
fine adjustment of monitoring locations were proposed in the baseline monitoring
report, the fine adjusted air and noise monitoring locations are recommended in
the EM&A manual. It is also recommended
that the air and noise
monitoring station condition should be regularly reviewed and fine adjustment
or relocation may be needed in order to obtain respective impact monitoring
results. The fine adjustment or relocation of monitoring location shall be
addressed in the updated EM&A manual during impact monitoring.
Comment
Water Quality of Seasonal Changes
6.1.1 The nature of
monitoring streams is for rainwater drainage. The catchment areas of those
streams are widely ranged and collected the rainwater and nature surface runoff
across the stream catchment area at Clear Water Bay Road and Ma Yau Tong Stream.
6.1.2 For impact water quality monitoring during
wet season, it is anticipated the water quality monitoring results may be similar to the baseline condition with a wide range of recorded
Turbidity and SS. As
such, it is recommended that the water quality monitoring shall act as an alarm
system to review the site condition. Review of site drainage and inspection
along site boundary shall be conducted by Contractor / RSS / ET to ensure no
surface runoff or seepage into the monitoring stream and cause contamination. Monitoring
condition during adverse weather shall also be recorded to avoid false alarm.
6.1.3 For impact water quality monitoring during
dry season, the water quality monitoring may not be feasible due to the extremely
shallow of water at the monitoring station. In case the situation was not
feasible for monitoring due to insufficient water flow, it is recommended that
inspection around the monitoring station to be conducted by ET to record the stream
condition.
Air Quality of Seasonal Changes
6.1.4 Baseline air quality monitoring was
conducted during typical Hong Kong wet season. The baseline data collected
therefore represent the baseline air quality of the wet season immediately
prior to commencement of the Project. It is therefore recommended that the
interpretation of the air quality monitoring data should take into account the
influence of the seasonal changes, and the baseline conditions should be
regularly reviewed.
Other noise sources
6.1.5 Baseline noise monitoring was conducted
prior to the construction works start. During the baseline monitoring period,
no construction activities were observed. The major noise source was traffic
noise around the monitoring stations (especially Clear Water Bay Road near
NMC03). It is possible that other noise sources would be identified during the impact
monitoring period such as other development project, road works or public
activities around the monitoring locations. It is recommended that the noise
monitoring station condition should be regularly reviewed and fine adjustment
or relocation may be needed in order to obtain respective impact monitoring
results.
6.1.6 Not used
Conclusion
6.1.7 In accordance with the Project EM&A
Manual and EP, baseline monitoring has been undertaken prior to commencement of
the construction works of the Contract for the following baseline monitoring
components: Air Quality; Noise and Water Quality.
6.1.8 As highlighted under Tables 2.2 and 3.2,
several fine adjustments of locations were proposed for baseline monitoring.
Nevertheless, given the fine adjusted location with similar pollution sources
and prevailing meteorological condition to the original locations recommended
in the EM&A manual, it is considered to be representative for the air and
noise sensitive receiver identified in EIA manual.
6.1.9 The baseline air quality monitoring was
conducted at eight (8) monitoring locations from 13 to 29 August 2018. Overall,
the baseline air quality monitoring results are considered representative to
the ambient air quality conditions of the respective sensitive receivers. The
Action and Limit Levels for air quality (for 1-hour TSP levels) were
established based on the baseline monitoring results.
6.1.10 Baseline noise monitoring was conducted at
five (5) designated monitoring stations from 13 August 2018 to 2 September 2018.
The major noise sources identified at the monitoring station are the noise from
traffic noise. The baseline monitoring results are considered representative of
the ambient noise level.
6.1.11 Baseline water quality monitoring was
conducted at four (4) monitoring stations from 13 August 2018 to 7 September
2018. No observable pollution source was recorded at the monitoring stations
and the baseline monitoring results are thus considered representative of the
ambient water quality levels. Action and Limit Levels were established for DO,
SS and turbidity based on the baseline monitoring results.
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