1.1.1
Civil Engineering
and Development Department (hereafter referred as “CEDD”) is the Project
Proponent and the Permit Holder of Agreement No. CE 59/2005 (EP)
Development of a Bathing Beach at Lung Mei, Tai Po (hereinafter
referred as “the Project”), which is a Designated Project to be implemented
under Environmental Permit number EP-388/2010 (hereinafter
referred as “the EP-388/2010” or “the EP”).
1.1.2
The major construction activities of the
Project comprise construction of 200-metre
long bathing beach with a groyne at each end, a shark prevention
net; a public car park; retaining walls; and the associated roadworks, drainage
and sewerage works. Layout plan of the Project is shown in Appendix A. Designated
works of the Project under the EP shall
include:
(i)
Construction of a 200m long beach with a groyne at each end of the beach which includes dredging and
sandfilling works;
(ii)
Construction of one culvert at the eastern side of the
beach and another small section of culvert and open drainage channel with
gabion embankments at the western end, both to collect and divert surface
runoff from upstream locations; and
(iii)
Construction of a beach building with associated beach
building facilities, kiosk and a carpark and associated road improvement works
adjoining the facility.
1.1.3
CEDD is Site
Resident Engineers responsible for the Project management; Welcome Construction
CO., Ltd is a Main Contractor (hereinafter referred as “the Main Contractor”) responsible to construction of the Project Works; and Action-United
Environmental Services & Consulting (hereinafter
referred as “AUES”) has been commissioned as an Independent Environmental Team
(hereinafter referred as “the ET”) to implement the relevant EM&A
program in accordance with the approved
EM&A Manual, as well as the associated duties. Moreover, Environmental
Resources Management is Independent Environmental Checker of the Project.
1.1.4
As part of the EM&A program, baseline
monitoring to determine the ambient environmental conditions including air
quality, noise and water quality were undertaken between 7 June 2017 and 21
October 2017. After
completed baseline monitoring, Baseline Monitoring Report for Air Quality and Noise (AUES Ref.: TCS00874/16/600/R0022v3) and Baseline
Monitoring Report for
Water Quality (AUES Ref.:
TCS00874/16/600/R0036v2) has been verified by IEC and submitted to EPD for endorsement. These baseline monitoring reports has summarized the key findings of
baseline condition and
determined a set
of Action and Limit Levels (A/L Levels) based on the baseline
data. The A/L Levels will serve as the
yardsticks for assessing the acceptability of the environmental impact during
construction phase of the Project Works impact monitoring.
1.1.5
The
construction phase of the Project was commenced on 1st December 2017
and EM&A programme was
commenced at the same day. The marine
work under the Project was commenced on 24th January 2018 subsequently.
1.1.6
This is the 3rd Quarterly EM&A report presenting the monitoring results and
inspection findings for the reporting period from 1 June 2018 to 31 August
2018.
1.2.1
The Quarterly EM&A Report is structured
into the following sections:-
Section 1 Introduction
Section 2 Project
Organization and Construction progress
Section 3 Summary of
Impact Monitoring Requirements
Section 4 Air Quality
Monitoring
Section 5 Construction
Noise Monitoring
Section 6 Water
Quality Monitoring
Section 7 Waste Management
Section 8 Ecology
Section 9 Site
Inspection
Section 10 Environmental
Complaint and non-compliance
Section 11 Implementation
Status of Mitigation Measures
Section 12 Conclusion
and Recommendation
2.1.1
Organization structure and contact details of relevant parties
with respect to on-site environmental management are shown in Appendix B.
2.2.1
The
major construction activities undertaken in the Reporting Period are listed
below:-
Table 2-1 Major
Construction Activities of the Works during the Reporting Period
|
Month
|
Major Construction Activities
|
|
June 2018
|
·
Site formation
·
Construction of Western Open Channel / Box
Culvert
·
Dredging and Construction of Groynes (East and
West)
|
|
July
2018
|
·
Site formation
·
Construction of Western Open Channel / Box
Culvert
·
Dredging and Construction of Groynes (East and
West)
|
|
August
2018
|
·
Site formation
·
Construction of Western Open Channel / Box Culvert
·
Dredging and Construction of Groynes (East and
West)
|
2.3
Summary of Environmental Submissions
2.3.1
Summary of currently relevant permits,
licenses, and/or notifications on environmental protection for this Project in
this Reporting Period is presented in Table 2-2.
Table 2-2 Status of Environmental Licenses and Permits
|
Item
|
Description
|
License/Permit Status
|
|
Permit
no./Account no./ Ref. no.
|
From
|
To
|
|
1
|
Air pollution Control (Construction
Dust) Regulation
|
Ref. Number: 418137
|
N/A
|
N/A
|
|
2
|
Chemical Waste Producer Registration
|
Waste
Producers Number (WPN): PN5213-728-W3437-01
|
21 August
2017
|
End of
Project
|
|
3
|
Water Pollution Control Ordinance
|
License No.: WT00028905-2017
|
24 October
2017
|
31 October
2022
|
|
4
|
Waste Disposal (Charges for Disposal of
Construction Waste) Regulation
|
Billing
Account for Disposal of Construction Waste: Account No. 7017686
|
3 July 2013
|
End of
Project
|
|
5
|
Construction Noise Permit (Noise Control
Ordinance)
|
GW-RN0379-18
|
27 Jul 2018
|
26 Sep 2018
|
2.3.2
The submission status as under the EP requirement
is presented in Table 2-3.
Table
2-3 Submission Status as under the EP Stipulation
|
Item
|
EP
condition
|
Description
|
Status
|
|
1
|
2.3
|
Management Organization of the Main Construction Companies
|
The updated version to be submitted in May 2018
|
|
2
|
2.4
|
Report for Capture and
Relocation of Common Rat
Snake
|
Approved by EPD on 15 Sep 2017 (EPD ref.: (15) in
EP2/N5/C/46 Pt.6 dated 15 Sep 2017)
|
|
3
|
2.5
|
Landscape Plan
|
Submitted to EPD on 28 June 2017
|
|
4
|
3.12
|
Mangrove Seedling Planting Proposal
|
Not yet submitted
|
|
5
|
3.13
|
Detailed Landscape As-built
Drawing(s)
|
Not yet submitted
|
|
6
|
4.3
|
Baseline Monitoring Report for Air Quality
and Noise (AUES Ref.: TCS00874/16/600/R0022v3)
|
Approved by EPD on 8 Jan 2018 (EPD ref.: (36) in
EP2/N5/C/46 Pt.6 dated 8 Jan 2018)
|
|
7
|
Baseline Monitoring Report for Water Quality(AUES Ref.: TCS00874/16/600/R0036v2)
|
Approved by
EPD on 10 Jan 2018 (EPD ref.: (37) in EP2/N5/C/46 Pt.6 dated 10 Jan 2018)
|
3.1.1
The Environmental Monitoring and Audit requirements are set out in
the EM&A manual. Environmental issues such as air quality, construction
noise and water quality were identified as the key issues during the
construction phase of the Project. A
summary of the EM&A requirements for air quality, noise monitoring and
water quality are presented in the sub-sections below.
3.2.1
According to the Project EM&A Manual, the Impact monitoring program
covers the following environmental issues:
Ÿ
Air Quality;
Ÿ
Construction Noise; and
Ÿ
Water Quality
3.2.2
A summary of the monitoring parameters is presented in Table
3-1 below.
Table 3-1 Summary
of EM&A Impact Monitoring Requirements
|
Environmental
Issue
|
Parameters
|
|
Air Quality
|
Ÿ 1-hour TSP
Ÿ 24-hour TSP
|
|
Noise
|
Ÿ
Leq (30min) in six consecutive Leq(5 min) between 07:00-19:00 on normal
weekdays
|
|
Water Qaulity
|
In-situ Measurements
Ÿ Dissolved Oxygen
Concentration (mg/L);
Ÿ Dissolved Oxygen Saturation
(% );
Ÿ Salinity (mg/L);
Ÿ Temperature (℃);
Ÿ Turbidity (NTU);
Ÿ pH unit;
Ÿ Current direction (degree);
Ÿ Current speed (m/s); and
Ÿ Water depth (m)
Laboratory Analysis
Ÿ Suspended Solids (mg/L); and
Ÿ Chlorophyll-a (µg/L)
|
Air Quality
3.3.1
There are air quality monitoring locations (A4 and
A6) recommended in
Section 3.1 of the EM&A Manual.
During liaison with the landlord of A6, he refused to provide access and
location for
installation of High Volume Air Sampler (HVAS). Therefore, alternative location (A7) was proposed by
ET in accordance with Section 3.4 of the EM&A Manual. The proposed alternative locations are considered capable of
effectively representing the baseline conditions at the impact monitoring
locations. The proposal (ref no.: TCS00874/16/300/L0016b) for alternative monitoring
locations was verified by IEC and it has been submitted to EPD for approval on 8 May 2017. The air quality
monitoring locations
are in Table
3-2 and illustrated in Appendix C.
Table 3-2 Location of Air Quality Monitoring
|
Station ID
|
Location
|
|
A4
|
No. 101 Lung Mei Tsuen
|
|
A7
|
Hong Kong Eco-Farm
|
Construction
Noise
3.3.2
According to Section 4.1 of the EM&A
Manual, four designated
noise sensitive receivers (N1, N2, N3 and N4) were
recommended and they are listed in Table 3-3.
Table 3-3 Designated
Noise Monitoring Station according to the EM&A Manual
|
NSR
|
Location
|
|
N1
|
Village
house - No. 165A Lung Mei
|
|
N2*
|
Village
house - No. 103 Lung Mei
|
|
N3
|
Village
house - No. 70 Lo Tsz Tin
|
|
N4
|
Village
house - No. 79 Lo Tsz Tin
|
Remarks:
(*) Noise monitoring should be conducted at N2a (i.e House No. 101 Lung Mei) if it is changed to residential
use during construction phase.
3.3.3
As confirmed on the first day of
baseline monitoring, N2a (House no. 101 Lung Mei) has been changed to
residential use. Therefore, the
noise monitoring is conducted at N2a and to replace N2. Moreover, due to the lack of accessibility of noise
monitoring at NSR N3 (Village house – No. 70 Lo Tsz Tin), alternative location was
proposed to
replace N3 to carry out the noise monitoring. Having reviewed the
surrounding condition, NSR N3a (Village house – No. 66C Lo Tsz Tin) was proposed
with the
rationales summarized in below.
1)
The
distance between N3 and N3a is about 18 meter apart and N3a locates at close
proximity of the project site and major site activities which are likely to
have noise impacts;
2)
N3a is
a village type residential house and it is a noise sensitive receiver (NSR);
3)
Accessibility
for noise monitoring work at N3a is available; and
4)
Minimal
disturbance would be only caused to the proposed monitoring location N3a.
3.3.4
The proposal (ref no.:
TCS00874/16/300/L0016b) for alternative monitoring locations was
verified by IEC and it has been submitted to EPD for approval on 8 May 2017. The noise monitoring
stations under the EM&A programme are listed in Table 3-4 and illustrated in Appendix C.
Table 3-4 Noise Monitoring Stations of the EM&A Programme
|
Station ID
|
Address
|
|
N1
|
Village
house No. 165A of Lung Mei
|
|
N2a
|
Village
house No. 101 of Lung Mei
|
|
N3a
|
Village
house No. 66C of Lo Tsz Tin
|
|
N4
|
Village
house No. 79 of Lo Tsz Tin
|
Water Quality
3.3.5
According to Section 5.1.2 of the Approved EM&A Manual, two Reference Stations
(R1 and R2), three impact stations (I1, I2 and I3), three sensitive receivers (FCZ1, W1 and M1) and one Gradient station (G1),
were identified to
perform water quality monitoring.
Detailed and co-ordnance of water quality monitoring stations is described
in Table
3-5 and the graphical is shown in Appendix C.
Table 3-5 Location
of Marine Water Quality Monitoring Station
|
Station
|
Coordinates
|
Description
|
|
Easting
|
Northing
|
|
G1
|
841483.9
|
835936.1
|
Gradient Station - to assist in the identification of the
source of any impact.
|
|
R1
|
842307.4
|
835718.4
|
Reference Station - for the background water quality for Tolo Harbour as it is at the
channel where the water exchange between the enclosed Plover Cove and Tolo Harbour take place. It is
located at south of the Project dredging/sandfilling area.
|
|
R2
|
840739.4
|
836212.4
|
Reference Station - for the background water quality in the Plover
Cove region. It is located at
southwest of the Project dredging/sandfilling area.
|
|
I1
|
841338.5
|
836588.5
|
Impact Station - located outside the mixing zone of
dredging/sandfilling works of the Project.
|
|
I2
|
841590.3
|
836601.2
|
Impact Station - located outside the mixing zone of
dredging/sandfilling works of the Project.
|
|
I3
|
841807.0
|
836680.9
|
Impact Station - located outside the mixing zone of
dredging/sandfilling works of the Project.
|
|
W1
|
841858.9
|
836571.0
|
Sensitive Receiver - located at the Water Sport Centre,
which is about 0.25 km distance to the southeast of the dredging/sandfilling
area.
|
|
M1
|
840822.2
|
836416.4
|
Sensitive Receiver - located at the Ting Kok
SSSI, which is about 0.8 km distance to the west of the dredging/sandfilling
area.
|
|
FCZ1
|
841180.6
|
835230.8
|
Sensitive Receiver - located at the Yim Tin Tsai East Fish
Culture Zone, which is about 1.5 km distance to the southwest of the
dredging/sandfilling area.
|
3.4.1
The frequency and the
duration for impact monitoring are summarized below.
Air Quality Monitoring
|
Ÿ Parameters:
|
1-hour TSP and 24-hour TSP
|
|
Ÿ Frequency:
|
3 times every six
days for 1-hour TSP and once every 6 days for 24-hour TSP
|
|
Ÿ Duration:
|
Throughout the
construction period
|
Noise Monitoring
|
Ÿ Parameters:
|
LAeq(30min) and statistical results L10 & L90
|
|
Ÿ Frequency:
|
Leq (30min) in 6
consecutive Leq(5min) for once a week during
07:00-19:00 on normal weekdays
|
|
Ÿ Duration:
|
Throughout the
construction period
|
Water Quality (Marine) Monitoring
|
Ÿ Parameters:
|
In-situ measurements including water
depth, Dissolved
Oxygen (DO) concentration (mg/L) & saturation (%), Salinity (mg/L),
Temperature (ºC) and Turbidity (NTU); and Suspended Solids (mg/L) and Chlorophyll-a (µg/L) are analyzed by
HOKLAS-accredited laboratory.
|
|
Ÿ Frequency:
|
Three days a week, at mid ebb and mid
flood tides. The interval between 2 sets of monitoring
will be more than 36 hours.
|
|
Ÿ Sampling Depth
|
1)
Three depths: 1m below water surface, 1m
above sea bottom and at mid-depth when the water depth exceeds 6m;
2)
If the water depth is between 3m and 6m,
two depths: 1m below water surface and 1m above sea bottom; and
3)
If the water depth is less than 3m, 1
sample at mid-depth is taken
|
|
Ÿ Duration:
|
During marine works proceeding such as the dredging and sand filling
|
3.4.2
In addition to the water quality
parameters, other relevant data will also be to measure and record, which are
included the location of the sampling stations, water depth, time, weather
conditions, sea conditions, tidal stage, current water flow direction and
speed, special phenomena and work activities undertaken around the monitoring
and works area that may influence the monitoring results. Observations on any special phenomena
and work underway at the Project site during the time of sampling will also be
to record.
Air Quality Monitoring
3.5.1
The 24-hour and 1-hour TSP levels shall be measured by following
the standard high volume sampling method as set out in the Title 40 of the Code of Federal Regulations, Chapter 1 (Part 50), Appendix B. If the ET proposes to use a direct
reading dust meter to measure 1-hour TSP levels, it shall submit sufficient
information to the IEC to prove that the instrument is capable
of achieving a comparable results to the HVS. The instrument should be calibrated
regularly, and the 1-hour sampling shall be determined on yearly basis by the
HVS to check the validity and accuracy of the results measured by direct
reading method. The filter paper of 24-hour
TSP measurement shall be determined by HOKLAS accredited laboratory.
3.5.2
All equipment to be used for air quality monitoring is listed in Table
3-6.
Table 3-6 Air
Quality Monitoring Equipment
|
Equipment
|
Model
|
|
24-Hour TSP
|
|
High Volume Air Sampler
|
TISCH High Volume Air Sampler, HVS Model
TE-5170
|
|
Calibration Kit
|
TISCH Calibration Kit Mode TE-5025A
|
|
1-Hour TSP
|
|
Portable Dust Meter
|
Sibata LD-3B Laser Dust Meter
|
Noise Monitoring
3.5.3
Sound level meter in compliance with the International Electrotechnical Commission Publications 651: 1979 (Type 1)
and 804: 1985 (Type 1) specifications shall be used for carrying out the noise
monitoring. The sound level meter
shall be checked using an acoustic calibrator. The wind speed shall be checked with a
portable wind speed meter capable of measuring the wind speed in ms-1
for reference.
3.5.4
Monitoring equipment to be used for construction noise measurement
is listed in Table 3-7.
Table 3-7 Construction
Noise Monitoring Equipment
|
Equipment
|
Model
|
|
Integrating Sound Level Meter
|
Rion NL-31 or Rion NL-52 or Brϋel & Kjær 2238
|
|
Acoustic Calibrator
|
Rion NC-74 or Rion NC-73 or Brϋel & Kjær 4231
|
|
Portable Wind Speed Indicator (#)
|
Anemometer
AZ Instrument 8908
|
(#) Wind speed is reference data only and there is no calibration certificate for portable wind speed indicator.
Water Quality Monitoring
3.5.5
For
water quality monitoring, the used equipment should be fulfill the requirements
under the Approved EM&A
Manual Section 5.1.1. Requirement of instruments is described in
the following sections.
3.5.6
Instruments to be used for Water
quality monitoring is listed in Table 3-8.
Table 3-8 Instrument
of Water Quality Monitoring
|
Equipment
|
Model
|
|
A
Digital Global Positioning System
|
GPS12
Garmin & Garmin eTrex
|
|
Water Depth Detector
|
Eagle Sonar CUDA 300 & Garmin ECHO 100
|
|
Water Sampler
|
A 2-litre transparent PVC
cylinder with latex cups at both ends or teflon/stainless
steel bailer or self-made sampler & Aquatic Research Transparent PC
Vertical Water Sampler 2.2L /
3L / 5L
|
|
Thermometer & DO meter
|
YSI
Professional Plus Multifunctional Meter &
|
|
pH meter
|
|
Turbidimeter
|
|
Salinometer
|
|
Current
Meter
|
Valeport Ltd – Model 106 Self Recording/Direct Reading Current Meter & Acoustic Doppler Current Profiler - RiverSurveyor M9
|
|
Storage Container
|
‘Willow’ 33-litre plastic cool box with Ice
pad
|
Air Quality
1-hour TSP
3.6.1
Operation of the 1-hour TSP meter will follow manufacturer’s Operation and Service Manual.
3.6.2
The 1-hour TSP monitor, brand named “Sibata LD-3B Laser Dust Meter” or “TSI AM510 Laser Dust Monitor” is a
portable, battery-operated laser photometer. The 1-hour
TSP meter provides a real time 1-hour TSP measurement based on 900
light scattering. The 1-hour TSP monitor consists of the following:
a.
A pump
to draw sample aerosol through the optic chamber where TSP is measured;
b.
A
sheath air system to isolate the aerosol in the chamber to keep the optics
clean for maximum reliability; and
c.
A
built-in data logger compatible with Windows based program to facilitate data
collection, analysis and reporting.
3.6.3
The 1-hour
TSP meter to be used will be within the valid period, calibrated by the manufacturer
prior to purchasing. Zero response of the instrument will be checked before and after each monitoring event. Annually calibration with the High
Volume Sampler (HVS) in same condition would be undertaken by the Laboratory.
24-hour TSP
3.6.4
The equipment used for 24-hour TSP measurement is the High
Volume Sampler (hereinafter the “HVS”) brand named TISCH, Model TE-5170 TSP
High Volume Air Sampler, which complied with EPA Code of Federal Regulation, Appendix B to Part 50. The HVS consists of the following:
a.
An anodized aluminum shelter;
b.
A 8”x10” stainless steel filter holder;
c.
A blower motor assembly;
d.
A continuous flow/pressure recorder;
e.
A motor speed-voltage control/elapsed time indicator;
f.
A 7-day mechanical timer, and
g.
A power supply of 220v/50 hz
3.6.5
For HVS for 24-hour TSP monitoring, the HVS is mounted in a
metallic cage with a top for protection and also it is sat on the existing
ground or the roof of building. The
flow rate of the HVS between 0.6m3/min and 1.7m3/min will
be properly set in accordance with the manufacturer’s instruction to within the
range recommended in EPA Code of Federal
Regulation, Appendix B to Part 50. Glass Fiber Filter 8" x 10" of
TE-653 will be used for 24-Hour TSP monitoring and would be supplied by
laboratory. The general procedures
of sampling are described as below:-
Ÿ
A horizontal platform with appropriate support to secure the
samples against gusty wind should be provided;
Ÿ
No two samplers should be placed less than 2 meters apart;
Ÿ
The distance between the sampler and an obstacle, such as
building, must be at least twice the height that the obstacle protrudes above
the sample;
Ÿ
A minimum of 2 meters of separation from any supporting structure,
measured horizontally is required;
Ÿ
Before placing any filter media at the HVS, the power supply will
be checked to ensure the sampler work properly;
Ÿ
The filter paper will be set to align on the screen of HVS to
ensure that the gasket formed an air tight seal on the outer edges of the
filter. Then filter holder frame
will be tightened to the filter hold with swing bolts. The holding pressure should be
sufficient to avoid air leakage at the edge.
Ÿ
The mechanical timer will be set for a sampling period of 24 hours
(00:00 mid-night to 00:00 mid-night next day). Information will be recorded on the
field data sheet, which would be included the sampling data, starting time, the
weather condition at current and the filter paper ID with the initial weight;
Ÿ
After sampling, the filter paper will be collected and transfer
from the filter holder of the HVS to a sealed envelope and sent to a local
HOKLAS accredited laboratory for quantifying.
3.6.6
All the sampled 24-hour TSP filters will be
collected and put into the filter envelope provided by the laboratory. The sample will be kept in normal air conditioned
room conditions, i.e. 70% HR (Relative Humidity) and 25oC and
delivery to the office within 48 hours and sent to laboratory for analysis. The sampled filter will be kept in the
laboratory for six
months prior to disposal.
3.6.7
The HVS used for 24-hour TSP monitoring will be calibrated before
the commencement for sampling, and after in two months interval for 1 point
checking of maintenance and six months interval for five points calibrate in
accordance with the manufacturer’s instruction using the NIST-certified
standard calibrator (TISCH Calibration Kit Model TE-5025A) to establish a relationship
between the follow recorder meter reading in cfm (cubic feet per minute) and
the standard flow rate, Qstd, in m3/min. Motor brushes of HVS will be regularly
replaced of about five hundred hours per time.
Construction Noise
3.6.8
As referred to in the Technical Memorandum (TM) issued under the
NCO, sound level meters in compliance with the International Electrotechnical
Commission Publications 651: 1979 (Type 1) and 804:1985 (Type 1) specifications
shall be used for carrying out the noise monitoring. Immediately prior to and
following each noise measurement the accuracy of the sound level meter shall be
checked using an acoustic calibrator generating a known sound pressure level at
a known frequency. Measurements may be accepted as valid only if the
calibration levels from before and after the noise measurement agree to within
1.0 dB.
3.6.9
All noise measurements will be performed with the meter set to
FAST response and on the A-weighted equivalent continuous sound pressure level (Leq). Leq(30 min) in six
consecutive Leq(5 min) measurements will be used as the
monitoring parameter for the time period between 07:00-19:00 hours on weekdays.
3.6.10
The sound level meter will be mounted on a tripod at a height of
1.2 m and placed at the assessment point and oriented such that the microphone
is pointed to the site with the microphone facing perpendicular to the line of
sight. The windshield will be fitted for all measurements. Where a
measurement is to be carried out at a building, the assessment point would
normally be at a position 1 m from the exterior of the building façade. Where a
measurement is to be made for noise being received at a place other than a
building, the assessment point would be at a position 1.2 m above the ground in
a free-field situation, i.e. at least 3.5 m away from reflective surfaces such
as adjacent buildings or walls.
3.6.11
Immediately prior to and following each noise measurement the
accuracy of the sound level meter will be checked using an acoustic calibrator
generating a known sound pressure level at a known frequency. Measurements will be accepted as valid
only if the calibration level from before and after the noise measurement
agrees to within 1.0 dB.
3.6.12
Noise measurements will not be made in fog, rain, wind with a
steady speed exceeding 5m/s or wind with gusts exceeding 10m/s. The wind speed
will be checked with a portable wind speed meter capable of measuring the wind
speed in m/s.
Water Quality (Marine) Monitoring
3.6.13
Marine water quality monitoring will be conducted at the
designated locations in accordance with EM&A Manual. The operating and
analytical of sampling procedures are described as below:
Ÿ A Global
Positioning System (GPS) will be used to ensure that the correct location was
selected prior to sample collection.
A portable, battery-operated echo sounder will be used for the
determination of water depth at each designated monitoring station.
Ÿ The marine water sampler will
be lowered into the water body at a predetermined depth. The trigger system of
the sampler is activated with a messenger and opening ends of the sampler are
closed accordingly then the sample of water is collected.
Ÿ During the sampling, the
sampling container will be rinsed to use a portion of the marine water sample
before the water sample is transferred to the container. Upon sampling completion, the container
is sealed with a screw cap.
Ÿ Before the sampling process,
general information such as the date and time of sampling, weather condition
and tidal condition as well as the personnel responsible for the monitoring will
be recorded on the monitoring field data sheet.
Ÿ In-situ measurement including
water temperature, turbidity, dissolved oxygen, salinity, pH and water depth
undertake at the identified monitoring point. At
each station, marine water samples are collected at three depths: 1m below
water surface, 1m above sea bottom and at mid-depth when the water depth
exceeds 6m. Samples at 1m below
water surface and 1m above sea bottom are collected when the water depth is
between 3m and 6m. Only 1 sample at
mid-depth is taken when the water depth is below 3m.
Ÿ For the
in-situ measurement, two consecutive measurements of sampling depth,
temperature, dissolved oxygen, salinity, turbidity and pH concentration will be
measured at the sea. The YSI ProDSS
Multifunctional Meter is retrieved out of the water after the
first measurement and then re-deployed for the second measurement. Where the difference in the value
between the first and second readings of each set is more than 25% of the value
of the first reading, the reading is discarded and further readings is taken.
Ÿ Water
sample would be collected by a water
sampler and then filled in high-density polythene bottles. Before the water sample storage, the
sampling bottles will be pre-rinsed with the same water sample. The sample bottles then is packed in
cool-boxes (cooled at 4OC without being frozen), and delivered to
HOKLAS accredited laboratory for the chemical analysis as followed APHA
Standard Methods.
Ÿ The laboratory has been comprehensive quality
assurance and quality control programmes. For QA/QC procedures, one duplicate
samples of every batch of 20 samples is analyzed as followed the HOKLAS
accredited requirement.
3.6.14
During marine
water sampling period, all in-situ measurement equipment will be calibrated at
three months interval accordingly. Except for the Current Velocity and
Direction water flow meter will be
calibrated every two years as recommended by the manufactory. Available
calibration certificates will be issued to ensure the performance of equipment
to use for in-situ measurement.
3.6.15
Before each
round of monitoring, the dissolved oxygen probe will be calibrated by wet bulb
method; a zero check in distilled water will be performed with the turbidity and
salinity probes; 4 and 10 values of the standard solution will be undertaken to
check the accuracy of pH value.
3.6.16
Valid calibration
certificates of monitoring equipment of air quality, construction noise and
water quality are shown in respectively monthly EM&A Report.
Laboratory Analysis
3.6.17
Chemical analysis will be
conducted for all water
samples by a HOKALS accredited laboratory - ALS Technichem
(HK) Pty Ltd. The chemicals analysis method and reporting
limit is shown Table
3-9.
Table 3-9 Testing Method and
Reporting Limit of the Chemical Analysis
|
Parameter
|
ALS Method Code
|
In-house
Method Reference 1
|
Reporting Limit
|
|
Total
Suspended Solids
|
EA025
|
APHA
2540D
|
2 mg/L
|
|
Chlorophyll-a
|
EP008F
|
APHA 10200 H2&H3
|
0.1 μg/L
|
Note: The exact method shall
depend on the laboratory accredited method. APHA = Standard Methods for
the Examination of Water and Wastewater by the American Public Health
Association.
3.7.1
The meteorological information including wind direction, wind speed,
humidity, rainfall, air pressure and temperature etc. during impact
monitoring is
extracted from the closest Hong Kong Observatory Station. To obtain the most appropriate meteorological information
where available,
Air Temperature/Pressure and Relative Humidity will be extracted from Tai Po
Station and wind speed and direction will be extracted from Tai Mei Tuk Station.
3.8.1
The baseline results form the basis for determining the
environmental acceptance criteria for the impact monitoring. A summary of the Action/Limit (A/L)
Levels for air quality, construction noise and water quality are shown in Table
3-10, 3-11 and 3-12 respectively.
Table 3-10 Action
and Limit Levels for Air Quality
|
Monitoring Station
|
Action Level (mg /m3)
|
Limit Level (mg/m3)
|
|
1-hour TSP
|
24-hour TSP
|
1-hour TSP
|
24-hour TSP
|
|
A4
|
275
|
142
|
500
|
260
|
|
A7
|
274
|
141
|
500
|
260
|
Table 3-11 Action and Limit Levels for
Construction Noise, dB(A)
|
Time Period: 0700-1900 hours on normal weekdays
|
|
Monitoring
Location
|
Action Level
|
Limit Level Note 1 & Note 2
|
|
N1,
N2a, N3a, and N4
|
When one documented complaint
is received
|
75
|
Note 1: Acceptable Noise Levels for school should be
reduced to 70 dB(A) and65 dB(A) during examination period
Note 2: If works are to be carried out during
restricted hours, the conditions stipulated in the construction noise
permit issued by the NCA have to be followed.
Table 3-12 Action and Limit Levels for
Water Quality
|
Monitoring Location
|
Action Level
|
Limit Level
|
|
Depth Average of SS (mg/L)
|
|
I1
|
7.0
|
OR
120% of any reference stations at the same tide of the same day
|
7.5
|
OR
130% of any reference stations at the same tide of the same day
|
|
I2
|
7.0
|
8.1
|
|
I3
|
8.3
|
15.0
|
|
W1
|
8.0
|
8.6
|
|
M1
|
10.0
|
11.0
|
|
FCZ1
|
7.0
|
8.0
|
|
Monitoring Location
|
Dissolved
Oxygen (mg/L)
|
|
Depth
Average of Surface & Mid-depth
|
Bottom
|
Depth
Average of Surface & Mid-depth
|
Bottom
|
|
I1
|
5.08
|
N/A
|
4.80
|
N/A
|
|
I2
|
5.26
|
3.64
|
4.88
|
3.37
|
|
I3
|
5.03
|
4.09
|
4.77
|
3.19
|
|
W1
|
4.67
|
2.41
|
4.54
|
2.33
|
|
M1
|
4.73
|
N/A
|
4.70
|
N/A
|
|
FCZ1
|
5.00
|
3.43
|
5.00
|
3.18
|
|
Monitoring Location
|
Depth Average
of Turbidity (NTU)
|
|
I1
|
2.8
|
OR
120% of any reference stations at the same tide of the same day
|
2.9
|
OR 130% of any reference stations at the same tide
of the same day
|
|
I2
|
3.5
|
7.7
|
|
I3
|
2.6
|
3.0
|
|
W1
|
2.9
|
3.3
|
|
M1
|
5.2
|
6.6
|
|
FCZ1
|
3.2
|
3.4
|
|
Monitoring
Location
|
Surface, Middle
& Bottom of
Chlorophyll-a (μg/L)
|
|
I1
|
11.1
|
12.1
|
|
I2
|
11.0
|
13.1
|
|
I3
|
11.3
|
14.5
|
|
W1
|
11.3
|
16.1
|
|
M1
|
16.9
|
42.4
|
|
FCZ1
|
11.8
|
12.5
|
Notes:
(a)
For
DO, non-compliance of water quality limits occurs when monitoring result is
lower than the limits
(b)
For
SS, chlorophyll-a and turbidity, non-compliance of the
water quality limits occurs when monitoring result is higher than the limits.
(c)
Both
Action and Limit Levels for DO (surface and middle) in the FCZ1 are less than 5
mg/L.
Event Action Plan
3.8.2
Should
non-compliance of the environmental quality criteria occurs, remedial actions
will be triggered according to the Event and Action Plan which presented in Appendix D.
3.9
Data Management and Data QA/QC Control
3.9.1
The impact monitoring data were handled by the
ET’s in-house data
recording and management system.
3.9.2
The monitoring data recorded in the equipment were downloaded
directly from the equipment at the end of each monitoring day. The downloaded monitoring data were
input into a computerized database properly maintained by the ET. The laboratory results were input
directly into the computerized database and checked by personnel other than
those who input the data.
3.9.3
For monitoring parameters that require laboratory analysis, the
local laboratory shall follow the QA/QC requirements as set out under the
HOKLAS scheme for the relevant laboratory tests.
4.
Air Quality Monitoring
4.1.1
In the Reporting Period, air quality monitoring was performed at the proposed monitoring
locations A4 and A7.
4.2.1
Summary of air quality monitoring results
during the Reporting Period are tabulated in Table 4-1. The database of monitoring result
throughout the Reporting Period is shown in Appendix E and
the relevant graphical plots are shown in Appendix F.
Table 4-1 Summary
of 24-hour and 1-hour TSP Monitoring Results
|
Monitoring Location
|
1-hour TSP (µg/m3)
|
24-hour TSP (µg/m3)
|
|
Max
|
Min
|
Mean / No. of Sessions
|
Max
|
Min
|
Mean / No. of Sessions
|
|
A4
|
107
|
12
|
56
|
130
|
17
|
53
|
|
Record Date
|
30-Jul-18
|
12-Jul-18
|
16 sessions
|
30-Jul-18
|
6-Jun-18
|
13 sessions (#)
|
|
A7
|
117
|
12
|
57
|
101
|
20
|
43
|
|
Record Date
|
22-Aug-18
|
12-Jul-18
|
16 sessions
|
25-Aug-18
|
6-Jun-18
|
16 sessions
|
(#) 3 sessions of 24-hour TSP monitoring at Station
A4 were suspended due to power supply issue.
4.2.2
Breaches of air quality A/L levels and
statistical analysis of compliance for the air quality monitoring results are summarized in Table 4-2.
Table 4-2 Summaries
of Breaches of Air Quality A/L Levels
|
Location
|
Exceedance
|
1-hour TSP
|
24- hour TSP
|
Total
|
|
A4
|
Action Level
|
0
|
0
|
0
|
|
Limit Level
|
0
|
0
|
0
|
|
A7
|
Action Level
|
0
|
0
|
0
|
|
Limit Level
|
0
|
0
|
0
|
4.2.3
As shown in Tables 4-1 to 4-2, all the 1-hour TSP and 24-hour TSP monitoring results were below
the Action/Limit Levels. No
Notification of Exceedance (NOE) was issued in this Reporting Period.
4.2.4
The summary of weather conditions during the Reporting Period is
presented in Appendix G.
5.1.1
In the Reporting Period, construction noise quality was performed at the designated monitoring
locations N1, N2a, N3a and N4.
5.2.1
Free-field
status were performed at N1 and N3a and façade correction (+3 dB(A)) has been added for the correction in according to the
acoustical principles and EPD guidelines.
The noise monitoring results at the designated locations are summarized
in Tables
5-1. The database of monitoring result
throughout the Reporting Period is shown in Appendix E and
the relevant graphical plots are shown in Appendix F.
Table 5-1 Summary of Construction Noise Monitoring
Results
|
Monitoring
Location
|
Leq, 30min (dB((A))
|
|
Max
|
Min
|
|
N1(*)
|
69
|
58
|
|
Record Date
|
12-Jul-18
|
7-Jun-18
|
|
N2a
|
65
|
55
|
|
Record Date
|
7-Jun-18
|
30-Jul-18
|
|
N3a(*)
|
69
|
54
|
|
Record Date
|
16-Aug-18
|
30-Jul-18
|
|
N4
|
67
|
56
|
|
Record Date
|
7-Jun-18
|
30-Jul-18
|
Remark:
(*) A façade correction of +3dB(A)
has been added according to acoustical principles and EPD guidelines.
5.2.2
Breaches of construction noise A/L
levels and statistical analysis of compliance for construction noise monitoring results are summarized in Table 5-2.
