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Contract No. HY/2011/03
Hong Kong-Zhuhai-Macao Bridge Hong Link Road Section between Scenic Hill and Hong Kong Boundary Crossing Facilities
Method Statement – Silt Curtain Pilot Test
Rev. 9
22 October 2013
1. Introduction ................................
1.1 Background ................................
2. Silt Curtain ................................
2.1 Introduction ................................
2.2 Pilot Test ................................
3. Silt Curtain – Pilot Test ................................
3.1 Objectives ................................
3.2 Pilot Test Sampling Points ................................
3.2.1 Sample Depths ................................
3.2.2 Sampling Points ................................
3.3 Sampling Parameters and Equipment
3.3.1 Sampling Parameters
3.3.2 Sampling Equipment
3.3.3 Sampling Equipment Cali
3.4 Pilot Test Duration and Sampling Frequency
3.4.1 Pilot Test Duration
3.4.2 Sampling Frequency
3.5 Other Conditions ................................
3.5 Determination of Silt Removal Efficiency
Figures Figure 1 Water Quality Impact Monitoring StationsFigure 2 Location of the SiteFigure 3 Sampling Points for Floating Type Silt Curtain
Contract No. HY/2011/03 : Hong Kong
Hong Kong Link Road
and Hong Kong Boundary Crossing Facilities
Method Statement –
Contents
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Sampling Parameters and Equipment ................................................................................................
Sampling Parameters ................................................................................................
Sampling Equipment ................................................................................................
Sampling Equipment Calibration ................................................................
Pilot Test Duration and Sampling Frequency ................................................................
Pilot Test Duration ................................................................................................
Sampling Frequency................................................................................................
................................................................................................................................
Determination of Silt Removal Efficiency ................................................................................................
Water Quality Impact Monitoring Stations Location of the Site Sampling Points for Floating Type Silt Curtain
Contract No. HY/2011/03 : Hong Kong-Zhuhai-Macao Bridge
Hong Kong Link Road - Section between Scenic Hill
and Hong Kong Boundary Crossing Facilities
Silt Curtain Pilot Test (Rev.9)
Page i
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`
1. Introduction
1.1 Background
The Hong Kong-Zhuhai-Macao Bridge (“H
Main Bridge at the Hong Kong Special Administrative Region (
Boundary Crossing Facilities (“HKBCF
Airport (“HKIA”). The Contract No. and Contract Title of this Contract are HY/2011/03 and HZMB Hong Kong
Link Road – Section between Scenic Hill and Hong Kong Boundary Cro
2).
This Method Statement outlines the requirements
Contract, specifically, Section 9.6 of the
HKLR (“Updated EM&A Manual”).
adopted for the Contract. There will be no dredging activities but
The Method Statement – Silt Curtain Pilot Test (Rev. 7)
layout has been changed due to the setup of temporary barging point for importing of fill material (Southern) and
interfacing with Contract No. HY/2010/02
has to be updated based on the latest silt curtain layout
2. Silt Curtain
2.1 Introduction
In accordance with Section 9.6 of the
contractor, China State Construction Engineering (Hong Kong) Ltd. (“CS
during the contract.
The silt curtains are intended as a measure to prevent the displacement and movement of sediments
construction and reclamation activities at the site
need to be verified by carrying out a Pilot Test
2.2 Pilot Test
The contract documents require that
the project. In order to ensure that the
preventing the movement of silt from within the
The Pilot Test will be carried out during early construction
curtains that are deployed by CSHK
rates, as specified in Section 9.6.4 of the
reduction of the water passing through the
Contract No. HY/2011/03 : Hong Kong
Hong Kong Link Road
and Hong Kong Boundary Crossing Facilities
Method Statement –
Macao Bridge (“HZMB”) Hong Kong Link Road (“HKLR”) serves to connect the HZMB
Main Bridge at the Hong Kong Special Administrative Region (“HKSAR”) Boundary and the HZMB Hong Kong
HKBCF”) located at the north eastern waters of the Hong Kong International
The Contract No. and Contract Title of this Contract are HY/2011/03 and HZMB Hong Kong
Section between Scenic Hill and Hong Kong Boundary Crossing Facilities respecti
outlines the requirements for a Silt Curtain Pilot Test that is required as part of the above
, specifically, Section 9.6 of the Updated Environmental Monitoring and Audit Manual
Based on the latest engineering design, a non-dredged method has been
adopted for the Contract. There will be no dredging activities but there will be filling works
Curtain Pilot Test (Rev. 7) was approved by EPD on 9 May 2013
layout has been changed due to the setup of temporary barging point for importing of fill material (Southern) and
HY/2010/02 HZMB HKBCF Reclamation Works (Northern)
based on the latest silt curtain layout and site conditions.
Section 9.6 of the Updated EM&A Manual, suitable silt curtains shall be deployed by the
contractor, China State Construction Engineering (Hong Kong) Ltd. (“CSHK”) enclosing the entire site at all times
a measure to prevent the displacement and movement of sediments
activities at the site. Therefore the effectiveness of the silt removal curtains will
carrying out a Pilot Test, during the early stages of marine construction
that single layer of floating type silt curtains will be required during the course of
In order to ensure that the type of silt curtain that is deployed at the site will be effective in
preventing the movement of silt from within the contract area, a Pilot Test will be undertaken.
will be carried out during early construction and reclamation activities
HK can meet the required silt removal efficiency. The req
, as specified in Section 9.6.4 of the Updated EM&A Manual, are defined as the degree of
water passing through the silt curtain are provided in Table 1 below.
Contract No. HY/2011/03 : Hong Kong-Zhuhai-Macao Bridge
Hong Kong Link Road - Section between Scenic Hill
and Hong Kong Boundary Crossing Facilities
Silt Curtain Pilot Test (Rev.9)
Page 1
) serves to connect the HZMB
) Boundary and the HZMB Hong Kong
rn waters of the Hong Kong International
The Contract No. and Contract Title of this Contract are HY/2011/03 and HZMB Hong Kong
respectively (see Figure
that is required as part of the above
Environmental Monitoring and Audit Manual (Version 1.0) for
dredged method has been
s for the Contract.
on 9 May 2013. The silt curtain
layout has been changed due to the setup of temporary barging point for importing of fill material (Southern) and
(Northern). Therefore, the plan
EM&A Manual, suitable silt curtains shall be deployed by the
enclosing the entire site at all times
a measure to prevent the displacement and movement of sediments during
he effectiveness of the silt removal curtains will
tages of marine construction.
floating type silt curtains will be required during the course of
deployed at the site will be effective in
e undertaken.
activities to confirm that the silt
efficiency. The required silt removal
defined as the degree of suspended solid
`
Table 1 Required Removal
Testing Scenario
Scenario 1 - Floating Type Single Silt Curtain
3. Silt Curtain – Pilot Test
3.1 Objectives
As outlined in Section 2 above, the silt
solids. The performance of the silt curtains
suspended solids within the water as it passes
In order to determine the efficiency of the
selected inside and outside the area
background concentrations of turbidity
A Pilot Test for the floating type silt curtain
sampling data to be collected during
To ensure that the Pilot Test that is undertaken is representative of the works undertaken at the HKLR site, the
Pilot Test will only be undertaken wh
3.2 Pilot Test Sampling Points
In order to determine the effectiveness of the
Section 3.2.2 below) inside and outside the area delineated by the silt curtains
of two (2) control points.
Measurements and water samples are to
depending upon the water depth (see Section 3.2.1
3.2.1 Sample Depths
Water parameters and the concentrations of suspended solids, will be
sampling location and control point location
• 1m below the surface of the water
• Mid depth at the sampling point
• 1m above the sea bed.
However, if the depth of water at a sampling
and parameters will be taken.
A portable, battery powered echo sounder
sampling locations and control point
Contract No. HY/2011/03 : Hong Kong
Hong Kong Link Road
and Hong Kong Boundary Crossing Facilities
Method Statement –
Removal Efficiency of Silt Curtain for Filling Activities
Silt Removal Rate to be Tested
Filling Activities
Single Silt Curtain 45%
Pilot Test
, the silt curtains need to be effective at reducing the concentration of suspended
. The performance of the silt curtains, for this contract, is measured as a percentage of
as it passes through the curtain.
In order to determine the efficiency of the silt curtains, water quality data will be required from
inside and outside the area delineated by the silt curtains. Control points will also be used to provide
turbidity that are typically present in the area of the project.
silt curtain scenario will be required, the sampling points to be used and the
be collected during the Pilot Test is outlined below.
To ensure that the Pilot Test that is undertaken is representative of the works undertaken at the HKLR site, the
Pilot Test will only be undertaken when marine filling activities are underway at the HKLR site.
Points
determine the effectiveness of the single layer of silt curtain, a suitable number of
inside and outside the area delineated by the silt curtains will be required
are to be collected from each sampling point at up to three (3)
(see Section 3.2.1 below) at each sampling point.
the concentrations of suspended solids, will be needed at the following depths
location:
of the water.
point.
sampling location is found to be less than 3m, then only the mid depth
powered echo sounder (or similar) is to be used to determine the depth of
locations.
Contract No. HY/2011/03 : Hong Kong-Zhuhai-Macao Bridge
Hong Kong Link Road - Section between Scenic Hill
and Hong Kong Boundary Crossing Facilities
Silt Curtain Pilot Test (Rev.9)
Page 2
Silt Removal Rate to be Tested
Filling Activities
45%
concentration of suspended
is measured as a percentage of reduction of
data will be required from sampling points
ontrol points will also be used to provide
sampling points to be used and the
To ensure that the Pilot Test that is undertaken is representative of the works undertaken at the HKLR site, the
en marine filling activities are underway at the HKLR site.
number of sampling points (see
will be required, along with the use
three (3) different depths,
the following depths at each
location is found to be less than 3m, then only the mid depth sample
e the depth of water at each of the
`
3.2.2 Sampling Points
For the purposes of the Pilot Tests
sampling point and one (1) downstream
will be undertaken at Seawall Chainage (SWCH)
position of the sampling points for each of the Pilot Tests.
Control data will be required for the
from the impact monitoring Control Stations CS
Given that the predicted currents from the EIA model simulations for this specific coastal area are rather weak
and that the localized flow pattern is complicated by the new construction activities associated with the HKBCF,
the actual conditions at the proposed monitori
influenced by the HKBCF (that have not been modeled) the proposed monitoring stations may be all located
upstream of the identified filling work that will be undertaken by CSHK.
Given the complicated situation envisaged within the sampling area, the water current should be determined at
each of the proposed monitoring positions prior to undertaking the proposed testing.
monitoring positions be identified to be weak
unanticipated direction etc.) for the proposed testing, alternative sampling points suitable situated relative to each
of the initial filling points will be proposed
Table 2 below provides details on the number of proposed monitoring points for each of the anticipated
construction scenarios.
Table 2 Monitoring Details for Silt Curtain Pilot Test
Monitoring Details
Control Stations
Sampling Points
Collection of Parameters at Depth
Water Sample (for suspended solids) D
Contract No. HY/2011/03 : Hong Kong
Hong Kong Link Road
and Hong Kong Boundary Crossing Facilities
Method Statement –
s, sampling points inside and outside the silt curtains
downstream sampling point will be used. According to CSHK, the initial filling work
will be undertaken at Seawall Chainage (SWCH) 300 – 800 and SWCH 900 – 1300.
sampling points for each of the Pilot Tests.
Pilot Tests, therefore water parameters and water samples will
ontrol Stations CS2 and CS(Mf)5 (see Figure 1).
predicted currents from the EIA model simulations for this specific coastal area are rather weak
and that the localized flow pattern is complicated by the new construction activities associated with the HKBCF,
the actual conditions at the proposed monitoring positions may vary. Additionally, given the variable conditions
influenced by the HKBCF (that have not been modeled) the proposed monitoring stations may be all located
upstream of the identified filling work that will be undertaken by CSHK.
complicated situation envisaged within the sampling area, the water current should be determined at
each of the proposed monitoring positions prior to undertaking the proposed testing. Should conditions at the
monitoring positions be identified to be weak or unsuitable (e.g. low current flow rate, or current in an
unanticipated direction etc.) for the proposed testing, alternative sampling points suitable situated relative to each
proposed to confirm the effectiveness of the silt curtain.
below provides details on the number of proposed monitoring points for each of the anticipated
Monitoring Details for Silt Curtain Pilot Tests
Single Layer of Floating Type Silt Curtain
CS2 and CS(Mf)5
4 number for each tidal condition, to be collected on the same
day. See Figure 3. Additionally, sample points within the
perimeter shall be sampled first.
(i) Ebb condition when filling works are undertaking at SWCH
300-800 – Undertake water sampling work at
and S3) and downstream (S2 and S4) locations.
(ii) Flood condition when filling works are undertaking at
SWCH 900-1300 – Undertake water sampling work
upstream (S6 and S8) and downstream (S5 and S7)
locations.
1m below water surface, mid-depth and 1m above seabed(for suspended solids) Depths
Contract No. HY/2011/03 : Hong Kong-Zhuhai-Macao Bridge
Hong Kong Link Road - Section between Scenic Hill
and Hong Kong Boundary Crossing Facilities
Silt Curtain Pilot Test (Rev.9)
Page 3
s and one (1) upstream
According to CSHK, the initial filling work
00. Figure 3 indicates the
and water samples will be collected
predicted currents from the EIA model simulations for this specific coastal area are rather weak
and that the localized flow pattern is complicated by the new construction activities associated with the HKBCF,
ng positions may vary. Additionally, given the variable conditions
influenced by the HKBCF (that have not been modeled) the proposed monitoring stations may be all located
complicated situation envisaged within the sampling area, the water current should be determined at
Should conditions at the
or unsuitable (e.g. low current flow rate, or current in an
unanticipated direction etc.) for the proposed testing, alternative sampling points suitable situated relative to each
below provides details on the number of proposed monitoring points for each of the anticipated
Floating Type Silt Curtain
4 number for each tidal condition, to be collected on the same
. Additionally, sample points within the
condition when filling works are undertaking at SWCH
Undertake water sampling work at upstream (S1
and S3) and downstream (S2 and S4) locations.
Flood condition when filling works are undertaking at
Undertake water sampling work at
upstream (S6 and S8) and downstream (S5 and S7)
depth and 1m above seabed
`
3.3 Sampling Parameters and Equipment
3.3.1 Sampling Parameters
As the silt removal efficiency of the silt curtains will be determined by the
following parameters, outlined in Table 3
Table 3 Parameters Required for th
Parameter
Dissolved Oxygen
Salinity
Temperature
pH
Turbidity
Suspended Solids
Water depth
Water velocity and direction
3.3.2 Sampling Equipment
The equipment used at each sampling
• Dissolved oxygen (“DO”) and temperature measurements, DO in the range of 0
saturation, and a temperature range of 0
with automatic temperature compensation complete with a cable.
• Salinity measured in the range of 0
• The pH measured between 0 and 14 on the pH scale.
• Turbidity will be measured in th
• Water depth will be recorded using a portable battery powered echo sounder or similar.
• A water current meter capable of measuring the rate and direction of flow
6.06m/s and an accuracy of 0.03m/s
Falmouth Scientific, Inc. 2-Dimensional Acoustic Current Meter, or
• A hand held or boat-fixed type digital Global Positioning System (dGPS) with way point bearing
indication and Radio Technical Commission for maritime Type 16 error message “screen pop
facilities (for real-time auto
Hydrographic Office), or other equipment of similar accuracy, should be used during maritime water
monitoring to ensure the monitoring vessel is at the correct location before taking measurements.
Water samples, for analysis for suspended solids, will be collected using a
similar instrument. The water samples
added (cooled to 4oC without being frozen)
laboratory within 24hours of the sample being collected.
Contract No. HY/2011/03 : Hong Kong
Hong Kong Link Road
and Hong Kong Boundary Crossing Facilities
Method Statement –
Parameters and Equipment
efficiency of the silt curtains will be determined by the analysis of collected
Table 3, will be analysed.
Parameters Required for the Silt Curtain Pilot Tests
Data Recorded in situ with Meter Water Sampl
�
�
�
�
�
�
�
sampling point will be required to record the following:
and temperature measurements, DO in the range of 0 –
and a temperature range of 0 – 45 degrees Celsius. It should have a membrane electrode
with automatic temperature compensation complete with a cable.
Salinity measured in the range of 0 -40 on the practical salinity scale.
between 0 and 14 on the pH scale.
in the range of 0 – 1,000NTU.
Water depth will be recorded using a portable battery powered echo sounder or similar.
meter capable of measuring the rate and direction of flow with a range of 0.1m/s to
6.06m/s and an accuracy of 0.03m/s. For example, the water current meter to be used shall be a
Dimensional Acoustic Current Meter, or an approved similar instrument.
fixed type digital Global Positioning System (dGPS) with way point bearing
indication and Radio Technical Commission for maritime Type 16 error message “screen pop
time auto-display of error messages and dGPS corrections from the Hong Kong
Hydrographic Office), or other equipment of similar accuracy, should be used during maritime water
monitoring to ensure the monitoring vessel is at the correct location before taking measurements.
r suspended solids, will be collected using a Kahlsico Water Sampler or
The water samples will be stored in high density polythene bottle ware
C without being frozen), kept in the dark and transported to an HOKLAS
laboratory within 24hours of the sample being collected.
Contract No. HY/2011/03 : Hong Kong-Zhuhai-Macao Bridge
Hong Kong Link Road - Section between Scenic Hill
and Hong Kong Boundary Crossing Facilities
Silt Curtain Pilot Test (Rev.9)
Page 4
collected water samples, the
Water Sample Required
�
20mg/l and 0 -200%
It should have a membrane electrode
Water depth will be recorded using a portable battery powered echo sounder or similar.
with a range of 0.1m/s to
he water current meter to be used shall be a
an approved similar instrument.
fixed type digital Global Positioning System (dGPS) with way point bearing
indication and Radio Technical Commission for maritime Type 16 error message “screen pop-up”
rrections from the Hong Kong
Hydrographic Office), or other equipment of similar accuracy, should be used during maritime water
monitoring to ensure the monitoring vessel is at the correct location before taking measurements.
Kahlsico Water Sampler or approved
bottle ware with no preservatives
HOKLAS approved testing
`
For quality assurance and quality control purposes, independent duplicate water samples for suspended solids
are to be taken at each sampling point and
Duplicate samples will be taken for the
HOKLAS or other international accredited laboratory.
hours after collection of the water samples.
Table 4 Laboratory Analysis for Suspended Solids
Parameter
Suspended Solid (SS)
Two consecutive measurements of DO concentration, DO saturation, pH, salinity, temperature
data quality control. The monitoring probes shall be retrieved out of water after the first measurement and then
redeployed for the second measurement
of DO or turbidity parameters is more than 25% of the value of the first reading, the reading shall be discarded
and further readings shall be taken.
3.3.3 Sampling Equipment Calibratio
The pH meter, DO meter, water meter
meter and turbidimeter will be certified by a laboratory accredited under HOKLAS or any other international
accreditation scheme. The responses of s
solutions before use. Wet bulb calibration for the DO meter will be carried out before carrying out
measurements at each monitoring location.
3.4 Pilot Test Duration and Sampling
3.4.1 Pilot Test Duration
In order to ascertain the efficiency of the silt curtains that are
is proposed that the Pilot Tests outlined in this Method Statement
during ebb and flood tides, subject to
The sampling parameters will be collected from the
Test.
3.4.2 Sampling Frequency
It is proposed that the water parameters
sampling points, before commencement of the Pilot Test,
intervals dependent upon the flood condition
flood conditions will be conducted at the same time as commencement of the marine filling works.
For ebb conditions it is proposed that the sampling interval will be
and for flood conditions it is proposed that the sampling interval will b
hours.
Contract No. HY/2011/03 : Hong Kong
Hong Kong Link Road
and Hong Kong Boundary Crossing Facilities
Method Statement –
For quality assurance and quality control purposes, independent duplicate water samples for suspended solids
are to be taken at each sampling point and control station.
the suspended solids measurement and the analysis shall be carried
international accredited laboratory. The laboratory determination work shall start within 24
water samples. The analysis for SS is summarized in Table 4
Laboratory Analysis for Suspended Solids
Instrumentation Reference Method Detection Limit
Weighting APHA 2540-D 0.5mg/l
of DO concentration, DO saturation, pH, salinity, temperature
e monitoring probes shall be retrieved out of water after the first measurement and then
redeployed for the second measurement. Where the difference in value between the first and second readings
of DO or turbidity parameters is more than 25% of the value of the first reading, the reading shall be discarded
Equipment Calibration
, water meter and turbidimeter shall be checked and calibrated before use. The DO
meter and turbidimeter will be certified by a laboratory accredited under HOKLAS or any other international
The responses of sensors and electrodes will be checked with certified standard
solutions before use. Wet bulb calibration for the DO meter will be carried out before carrying out
measurements at each monitoring location.
Sampling Frequency
In order to ascertain the efficiency of the silt curtains that are intended for use by CSHK during filling
outlined in this Method Statement last for a period of 4 hour
, subject to marine construction activities and encountered weather conditions
will be collected from the sampling points indicated in Section 3.2.2
the water parameters and water samples for SS outlined in Table 3 will
, before commencement of the Pilot Test, at commencement of the Pilot Test, and then
flood condition for the duration of the Pilot Test. The Pilot Test
will be conducted at the same time as commencement of the marine filling works.
it is proposed that the sampling interval will be 30 minutes for a total time period of
and for flood conditions it is proposed that the sampling interval will be 30 minutes for a total time period of
Contract No. HY/2011/03 : Hong Kong-Zhuhai-Macao Bridge
Hong Kong Link Road - Section between Scenic Hill
and Hong Kong Boundary Crossing Facilities
Silt Curtain Pilot Test (Rev.9)
Page 5
For quality assurance and quality control purposes, independent duplicate water samples for suspended solids
shall be carried out at a
The laboratory determination work shall start within 24
4 below.
Detection Limit
0.5mg/l
of DO concentration, DO saturation, pH, salinity, temperature and turbidity for
e monitoring probes shall be retrieved out of water after the first measurement and then
. Where the difference in value between the first and second readings
of DO or turbidity parameters is more than 25% of the value of the first reading, the reading shall be discarded
and turbidimeter shall be checked and calibrated before use. The DO
meter and turbidimeter will be certified by a laboratory accredited under HOKLAS or any other international
ensors and electrodes will be checked with certified standard
solutions before use. Wet bulb calibration for the DO meter will be carried out before carrying out
during filling activities, it
ours and be undertaken
weather conditions.
points indicated in Section 3.2.2 during the Pilot
will be collected from the
commencement of the Pilot Test, and then at
The Pilot Test under ebb and
will be conducted at the same time as commencement of the marine filling works.
for a total time period of 2 hours
minutes for a total time period of 2
`
3.5 Other Conditions
As stated in the Updated EM&A Manual, regardless of the measured efficiency of the silt curtain system the event
and action plan provided in the Updated
designated monitoring stations.
The Environmental Project Office, S
least one week in advance of conducting the pilot test.
If inclement weather conditions are forecast for the day of the Pilot Test, the test will be postponed
as appropriate.
3.5 Determination of Silt Removal Efficiency
The laboratory results of the pilot test will be utilized to determine the efficiency of the
deployed at the site. The silt curtain is intended to act as a barrier to suspended solids by holding them in a
stagnation pocket behind the silt curtain.
In order to quantify the effectiveness of the silt curtain type that is deployed by CSHK, the concentrations of SS
and the levels of turbidity inside and outside of the curtain will be compared
of SS is to be used as the effectiveness
difference in readings.
The overall reduction in the concentrations of SS will be determined for the three depth positions and an overall
reduction will also be calculated for all depths to provide the silt removal efficiency of the silt curtain.
The TSS removal efficiency shall be calcula
��� ������� % �
Contract No. HY/2011/03 : Hong Kong
Hong Kong Link Road
and Hong Kong Boundary Crossing Facilities
Method Statement –
A Manual, regardless of the measured efficiency of the silt curtain system the event
Updated EM&A Manual will only be based on the monitoring results at the
, Supervising Office and Environmental Protection Department
least one week in advance of conducting the pilot test.
forecast for the day of the Pilot Test, the test will be postponed
Determination of Silt Removal Efficiency
The laboratory results of the pilot test will be utilized to determine the efficiency of the silt curtains that will be
The silt curtain is intended to act as a barrier to suspended solids by holding them in a
stagnation pocket behind the silt curtain.
In order to quantify the effectiveness of the silt curtain type that is deployed by CSHK, the concentrations of SS
e levels of turbidity inside and outside of the curtain will be compared. The percent reduction in the level
effectiveness parameter. Percent reduction is defined as 100 times the ratio of the
l reduction in the concentrations of SS will be determined for the three depth positions and an overall
reduction will also be calculated for all depths to provide the silt removal efficiency of the silt curtain.
The TSS removal efficiency shall be calculated by:
Upstream TSS �mg/l� � Downstream TSS �mg
Upstream TSS �mg/l�
Contract No. HY/2011/03 : Hong Kong-Zhuhai-Macao Bridge
Hong Kong Link Road - Section between Scenic Hill
and Hong Kong Boundary Crossing Facilities
Silt Curtain Pilot Test (Rev.9)
Page 6
A Manual, regardless of the measured efficiency of the silt curtain system the event
EM&A Manual will only be based on the monitoring results at the
epartment will be notified at
forecast for the day of the Pilot Test, the test will be postponed to the next day
silt curtains that will be
The silt curtain is intended to act as a barrier to suspended solids by holding them in a
In order to quantify the effectiveness of the silt curtain type that is deployed by CSHK, the concentrations of SS
The percent reduction in the level
Percent reduction is defined as 100 times the ratio of the
l reduction in the concentrations of SS will be determined for the three depth positions and an overall
reduction will also be calculated for all depths to provide the silt removal efficiency of the silt curtain.
mg/l� x 100
`
Contract No. HY/2011/03 : Hong Kong
Hong Kong Link Road
and Hong Kong Boundary Crossing Facilities
Method Statement –
Contract No. HY/2011/03 : Hong Kong-Zhuhai-Macao Bridge
Hong Kong Link Road - Section between Scenic Hill
and Hong Kong Boundary Crossing Facilities
Silt Curtain Pilot Test (Rev.9)
Page 7
FIGURES
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N
11/11AWA
AW
1:25000 @A1
11/11
A
SKRY
TENDER
ENVIRONMENTAL MONITORING
STATIONS
LEGEND
820000 N
815000 N
TUNG CHUNG
AIRPORT CHANNEL
HONG KONG INTERNATIONAL AIRPORT (
HKIA)
(BY OTHERS)
FACILITIES (HKBCF)
BOUNDARY CROSSING
PROPOSED HONG KONG
(BY OTHERS)
CHEK LAP KOK LINK
PROPOSED TUEN MUN-
LINK ROAD (HKLR)
PROPOSED HONG KONG
WAN
SHEK
SAN
HKS
AR
BO
UN
DA
RY
HKLR
PROPOSED
(BY OTHERS)
MAIN BRIDGE
HZMB
WAN
LO
SHA
IS5
IS7
IS8
IS10
IS(Mf)9
IS(Mf)6 SR4
SR5
AMS
NMS
NMS5
AMS5
NMS3
AMS3
NMS2
AMS2
AMS6
LANTAU ISLAND
(WATER QUALITY)
IMPACT STATIONS
(WATER QUALITY)
CONTROL/FAR FIELD STATIONS
(WATER QUALITY)
SENSITIVE RECEIVERS STATIONS
(AIR QUALITY)
MONITORING STATIONS
(NOISE)
MONITORING STATIONS
IS
CS
SR
ST
RESULT (WATER QUALITY)
STATION FOR SENSITIVITY TEST
NOTES
TENDER ADDENDUM ISSUE
ENVIRONMENTAL MONITORING AND AUDIT WORKS.
STIPULATED IN THE EM&A MANUALS TO CONDUCT THE
3. THE CONTRACTOR SHALL COMPLY WITH THE REQUIREMENTS
CS2
PROPOSED LOCATION OF THE MONITORING STATIONS.
APPROVED BY THE SUPERVISING OFFICER FOR THE
ENVIRONMENTAL PROJECT OFFICE (ENPO) AND
INDEPENDENT ENVIRONMENTAL CHECKER (IEC) AND
ENVIRONMENTAL TEAM (ET) SHALL AGREE WITH THE
TO BE DETERMINED ON SITE. THE CONTRACTOR AND
1. EXACT LOCATIONS OF MONITORING STATIONS ARE
8100
00
E
8150
00
E
8050
00
E805000
E
810000
E
815000
E
820000 N
815000 N(TUNG CHUNG BAY)
MUDFLAT SURVEY
(SAN TAU)
MUDFLAT SURVEY
N
824500 N
822500
E
822000 N
825000
E
827500
E
SR10A
SR10B
TSING MA BRIDGE
MA WAN
TSING YI
LANTAU ISLAND
INSET A N
LANTAU ISLAND
HKIA
KEY PLAN
INSET A
TUEN MUN
E&MA MANUALS.
THE REQUIREMENTS STIPULATED IN THE EIA REPORTS AND
DETAILS OF THE MUDFLAT SURVEY IN ACCORDANCE WITH
WITH THE IEC, ENPO AND SUPERVISING OFFICER THE
THE CONTRACTOR AND ET SHALL DETERMINE AND AGREE
SHOWN ON THIS DRAWING ARE APPROXIMATE ONLY.
2. THE LOCATION AND EXTENT OF MUDFLAT SURVEY
SR3
CS(Mf)5
Filena
me :
J:\
214
487\
Record\
HY
_2
011_
03\
Tender
Addendu
m (2
011-11-11)\
DG
N\
E-
HY
_2
011_
03-
DR
G_
310-
A-00.d
gn
10/11/2011
Printed by :
Rev.
Status
Rev DateByDescription
Drawn
Drawing no.
Date Checked
Drawing title
Scale
Consultant
Approved
Contract No. and Title:
COPYRIGHT RESERVED
c OVE ARUP & PARTNERS HONG KONG LIMITED.
ALL RIGHTS RESERVED.
DO NOT SCALE DRAWING. CHECK ALL DIMENSIONS ON SITE.
Contract No. HY/2011/03
Hong Kong Boundary Crossing Facilities
Section Between Scenic Hill and
Hong Kong Link Road -
Hong Kong-Zhuhai-Macao Bridge
TUNG CHUNG
SCENIC HILLAFSCTANK FARM
HONG KONG INTERNATIONAL AIRPORT
AIRPORTCARGO AREA
CHEK LAP KOK
CATHAYCITY
GSE
Location of the Site
0 100 200 Meters
LEGEND
Site Boundary of Contract HY/2011/03
EASTING NORTHING
S1 811988.425 817848.268
S2 812005.160 817837.315
S3 811904.755 817903.033
S4 812088.830 817782.550
S5 812214.385 819032.287
S6 812203.432 819015.553
S7 812269.150 819115.958
S8 812148.668 818931.882
COORDINATESSAMPLING
POINT
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