1.1.1
A residential development and a Wetland Nature
Reserve (“WNR”) (hereinafter collectively called the “Project”) is proposed to
be developed at existing fishponds at Lot 1457 R.P.,
D.D. 123 Fung
Lok Wai, (the Subject site). The Project comprises the following main
components: -
·
approximately 4.0 ha
of residential land for 148,000m2 GFA residential development and a
club house for residents;
·
approximately 76.1 ha of
enhanced and managed WNR, comprising enhanced fish ponds, marsh complex and
alternative egretry;
1.1.2
According to Item P of Part I, Schedule 2 of the Environmental Impact Assessment (EIA) Ordinance,
the Project is classified as a Designated Project. Error! Reference source not found. shows the site
boundary and the proposed access road.
1.1.3
As part of the Environmental
Impact Assessment (EIA) study for the Project, a Manual for guiding the setup
of an Environmental Monitoring and Audit (EM&A) programme to check the
implementation of the relevant environmental mitigation measures recommended in
the EIA is required. The EM&A
programme will be useful in providing a means to verify the effectiveness and adequacy
of the mitigation measures recommended in the EIA such that additional
mitigation measures or remedial action, if deemed necessary, can be formulated.
1.1.4
As part of the EIA study for
the Project, CH2M HILL Hong Kong Limited (the Consultant) has been
commissioned as the lead consultant to prepare this EM&A manual in
associated with RPS, Asia Ecological Consultant, ADI Ltd. and Archaeological
Assessments.
1.1.5
Through the EIA study for the
Project, a number of environmental mitigation measures are recommended to be implemented
during the construction and operational phases of the Project. These mitigation measures and their
implementation requirements are summarised in the Implementation Schedule
contained in Appendix I of this EM&A Manual.
1.1.6
In order to ensure that these
recommended environmental mitigation measures are fully and effectively
implemented, the EIA Report for the Project recommended the following:
·
Carrying out of EM&A works
with respect to construction dust and noise during the construction phase of
the Project;
·
Carrying out water quality
monitoring during the construction phase;
·
Carrying out landscape and
visual monitoring during the construction phase;
·
Checking of construction waste
management practices through an environmental audit process; and
·
Carrying out ecological
monitoring during the construction and operation phase.
1.1.7
These EM&A works are
recommended to be carried out by an Environmental Team (ET) formed before the
commencement of the construction works.
1.1.8
This Manual provide systematic
procedures for the carrying out of recommended monitoring and auditing works
for checking of potential environmental impacts which may arise from the
project. Mitigation measures recommended
in the EIA Report for each key environmental aspect are also summarised and
presented.
1.1.9
Environmental regulations
currently enforced in Hong Kong pertaining to
air quality, noise and waste, etc. and the recommendations given in the EIA
study report for the Project have been observed in the preparation of this
Manual.
1.2.1
The main objectives of the
EM&A programme include:
1.
To provide a database on
baseline environmental quality for subsequent checking of any short or long
term environmental impacts arising from the Project;
2.
To provide information at an
early stage for identification of potential problem areas and formulation of
additional environmental mitigation measures where necessary should any of the
environmental control measures or practices fail to achieve the target standards;
3.
To monitor the performance of
the Project from an environmental viewpoint and the sufficiency and
effectiveness of the implemented mitigation measures;
4.
To verify the environmental
impacts predicted in the EIA Study for the Project;
5.
To determine compliance of the
Project with relevant regulatory standards, requirements and guidelines;
6.
To take remedial action should
unexpected problems or unacceptable impacts are identified;
7.
To provide baseline and compliance
monitoring data to assist the carrying out of effective environmental audits.
1.3.1
The recommended EM&A
programme in this Manual contains the following information:
1.
Duties of the Environmental Team
(ET) in the environmental monitoring and audit programme;
2.
Information on project
organisation, construction schedule and activities;
3.
Information on the tentative
construction programme and the necessary environmental monitoring and audit
programme to track the varying environmental impacts;
4.
Definition of Action and Limit
levels, and establishment of Event and Action Plans;
5.
Requirements of reviewing
pollution sources and work procedures in the event of non-compliance of the
environmental criteria;
6.
Requirements of presentation of
environmental monitoring and audit data and appropriate reporting procedures;
7.
An Implementation Schedule
(Appendix I) of the environmental mitigation measures recommended in the EIA
report for the Project;
8.
Record forms (Appendix II) to
be adopted where applicable during the construction phase of the Project.
1.3.2
The EM&A Manual shall be
regarded as an evolving document that should be updated when necessary in order
to maintain its relevance during the detailed design stage and/or the
construction phase (e.g. when alternative monitoring locations are
proposed). The updated EM&A Manual
shall be submitted to the ER and EPD for agreement.
2.1.1
The Subject Site is located at Lot 1457 R.P. in D.D. 123, Fung Lok Wai and the total
site area is about 80.1 ha. The about 4 ha residential site will be formed by
filling the fishponds at the southern part of the Subject Site with a WNR to be
established to its north. The access road connects the Project to the Yuen Long
Industrial Area through existing Fuk
Shun Street. Approximately half of the proposed
Fung Lok Wai Wetland Nature Reserve lies within the Mai Po Inner Deep Bay
Ramsar Site (Buffer Zone 1), with the remaining area within Buffer Zone 2. The
northern boundary adjoins the Inner Deep Bay Site of Special Scientific
Interest (SSSI).
2.2.1
shows the tentative construction programme of
the Project. Construction activities are planned to commence in the 3rd
quarter of 2010 for
completion in the 3rd quarter of 2016. i.e. a total of about 6 years.
1.
First phase (3rd
quarter of 2010 to 2nd quarter of 2013) - establishment
of the Wetland Nature Reserve (WNR). Key construction activities to be carried
out include:
·
Relocating water from Sector 1,
Sector 2 and Sector 3 ponds at different phases;
·
Draining, removing bunds and
installing water controls at Sector 1, Sector 2 and Sector 3 of the WNR at
different phases;
·
Re-filling ponds at Sector 1,
Sector 2 and Sector 3 of the WNR;
·
Selective felling and
vegetation management at Sector 1, Sector 2 and Sector 3 of the WNR at
different phases;
·
Land formation and water
control structures construction of the Marshland area;
·
Habitat creation of the
Marshland area;
·
Constructing facilities of the
Marshland area, such as board walks, hides, toilets and shelters.
2.
Second phase (2nd
quarter of 2011 to 3rd quarter of 2016) - construction
works for development area. Key construction activities to be carried out are
listed below:
·
Site clearance for the
construction works for development area;
·
Pond draining and dredging at
built area;
·
Delivery of fill material by
trucks to the site;
·
Spreading and compaction of
fill material at built area;
·
Foundation and superstructure
works for buildings;
·
Construction of sewage pump house;
·
Laying of drainage, sewerage
and utilities;
·
Paving of internal access road.
3.
Third phase (4th
quarter of 2014 to 3rd quarter of 2016) – widening works
of the access road leading to the Project site. Key construction activities
include:
·
Site clearance and formation
for the widening of the Access Road leading to the site;
·
Laying of drainage, sewerage
and utilities;
·
Formation of road sub-base,
levelling and compaction;
·
Road paving and installation of
road furniture;
·
Construction of landscape
works;
·
Soft landscape establishment
works.
2.2.3
sets out the indicative boundary of the various site
portions.
2.3.1
The following areas, identified
in the EIA for this Project, will require EM&A during the construction or
operational phase:
·
Air Quality: construction dust
·
Noise Impact: construction
noise
·
Water Quality
·
Waste Management
·
Ecology
·
Landscape and Visual
3.1.1
The key parties in an EM&A
programme include the Contractor, the Engineer[1] or
the Engineer’s representative (ER)1, the Environmental Team (ET), the
Independent Checker (Environment) (IC(E)) and the Environmental Protection
Department (EPD). Sufficient and suitably qualified professional and technical
staff shall be employed by the respective parties to ensure full compliance
with their duties and responsibility, as required under the EM&A programme
for the duration of the project.
3.1.2
A typical construction phase
environmental monitoring and audit procedure is enclosed in Appendix III for
reference.
Environmental Team
3.1.3
An Environmental Team (ET)
shall be appointed to carry out the recommended EM&A works for the
Project. The ET shall not be in any way
an associated body of the Contractor. The ET shall be under the supervision of
the ET Leader
in fulfilling the EM&A duties specified in this Manual. The ET Leader shall plan, organise and manage
the implementation of the EM&A programme, and to ensure that the EM&A
works are undertaken to the required standards.
The ET Leader shall have relevant professional qualifications in
Environmental Sciences or Environmental Engineering, and possesses at least 7
years experience in EM&A and/ or environmental management.
3.1.4
The ET Leader shall be
responsible for the implementation of the EM&A programme in accordance with
the EM&A requirements specified in this Manual. The ET Leader shall keep a contemporaneous
log-book of each and every instance or circumstance or change of circumstances
which may affect the EIA and each and every non-compliance with the
Environmental Permit or the recommendations in the EIA report. This log-book shall be kept readily available
for inspection by the IC(E), and Director of Environmental Protection (DEP) or
his authorized officers. The ET shall
not be an associated body of the IC(E) in the project.
3.1.5
The board categories of woks of
the ET comprise the followings:
1.
Sampling, analysis and
statistical evaluation of monitoring parameters with reference to the EIA study
recommendations and requirements;
2.
Environmental site
surveillance;
3.
Audit of compliance with environmental
protection, and pollution prevention and control regulations;
4.
Monitor the implementation of
environmental mitigation measures;
5.
Monitor compliance with the
environmental protection clauses/specifications in the Contract;
6.
Review establishment, construction and operation programmes of the
Project and provide comments as necessary;
7.
Review work methodologies which
may affect the extent of environmental impact during the establishment,
construction and operation phases and comment as necessary;
8.
Complaint investigation,
evaluation and identification of corrective measures;
9.
Liaison with the Project
Independent Checker (Environmental) (IC(E)) on all environmental performance
matters, and timely submission of all relevant EM&A proforma for IC(E)’s
approval;
10.
Advice to the Contractor on
environmental improvement, awareness, enhancement matters, etc., on site; and
11.
Timely submission of the
EM&A report to the Project Proponent and the DEP.
3.1.6
In the event of any exceedance in
action/ limit levels, the ET shall immediately inform the IC(E), Engineer/ ER
and the Contractor so that appropriate remedial action can be undertaken by the
Contractor promptly. The ET is also
responsible for the preparation of the monthly EM&A reports for submission
to IC(E), the Contractor and the Engineer/ ER, and through the Engineer/ ER to
EPD. The ET shall assist the Contractor
and the Engineer/ ER in formulating any necessary corrective actions and/ or additional
mitigation measures, and liaising with relevant Government Departments where
necessary.
Independent Checker (Environment)
3.1.7
The Independent Checker
(Environment) (IC(E)) shall advise the ER on environmental issues related to
the project. The IC(E) shall not be in any
way an associated body of the Contractor or the ET for the Project. The IC(E)
shall be empowered to audit from an independently viewpoint the environmental
performance during the construction and operation of the Project. The IC(E) shall be a person who has at least
7 years’ experience in EM&A or environmental management. The IC(E) shall be responsible for the duties
defined in the Environmental Permit and this EM&A Manual, and shall audit
the overall EM&A programme, including the implementation of all
environmental mitigation measures, submissions required in this EM&A
Manual, and any other submissions required under the Environmental Permit. The IC(E) shall be responsible for verifying
the environmental acceptability of permanent and temporary works, relevant
design plans and submissions under the Environmental Permits. The IC(E) shall verify the log-book prepared
and kept by the ET Leader. The IC(E)
shall notify DEP by fax, within 24 hours of each and every occurrence, change
of circumstances or non-compliance with the EIA Report or the Environmental
Permit, which might affect the monitoring or control of adverse environmental
impact.
3.1.8
The main duty of the IC(E) is
to carry out independent environmental audit of the Project. This shall
include, inter alias, the followings:
1.
Review and audit in an
independent, objective and professional manner in all aspects of the EM&A
programme;
2.
Validate and confirm the
accuracy of monitoring results; appropriateness of monitoring equipment, monitoring
locations with reference to the locations of the nearby sensitive receivers,
and monitoring procedures;
3.
Carry out random sample check
and audit on monitoring data and sampling procedures, etc;
4.
Conduct random site inspection;
5.
Audit the EIA recommendations
and requirements against the status of implementation of environmental
protection measures on site;
6.
Review the effectiveness of
environmental mitigation measures and project environmental performance;
7.
On a need basis, verify and
certify the environmental acceptability of the construction methodology (both
temporary and permanent works), relevant design plans and submissions under the
environmental permit. Where necessary, the IC(E) shall agree in consultation with the ET Leader and the
Contractor the least impact alternative;
8.
Verify investigation results of
complaint cases and the effectiveness of corrective measures;
9.
Verify EM&A report
submitted and certified by the ET Leader; and
10.
Feedback audit results to ET/ER
by signing according to the Event/ Action Plans specified in this EM&A
Manual.
The Contractor
3.1.9
The Contractor is responsible
for providing requested information to the ET in the event of any exceedance in
the environmental criteria (action/ limit levels) specified in this Manual or
other current environmental standards, and to rectify unacceptable
practices. The Contractor shall discuss
with the ET, IC(E) and ER on any additional mitigation measures identified to
be required by the ET and implement the agreed measures to alleviate any
identified environmental impact to acceptable levels. The Contractor shall report to the ET on the
actions taken targeting at environmental protection for inclusion in the monthly
report to be prepared by the ET.
The Engineer or the Engineer’s
Representative
3.1.10
The Engineer, or the ER shall
be responsible for overseeing the operations of the Contractor, the ET. He shall advise, co-ordinate and give
instruction when appropriate for efficient implementation of any specific
environmental mitigation measures identified to be required by the contractor,
and/or outstanding EM&A works required to be carried out by ET in
consultation with the IC(E). The ER
shall supervise the Contractor’s activities and ensure that the requirements in
the EIA Report and EM&A Manual are fully complied with. He shall inform the Contractor when action is
required to reduce impacts in accordance with the Event/ Action Plans. He shall
review the EM&A Reports submitted by the ET and follow up the
recommendations. He shall ensure that
the Contractor is implementing the environmental controls and mitigation
measures as set out in the EIA report and EM&A Manual, as well as
additional measures necessary for compliance with the relevant environmental
standards.
4.
Construction dust monitoring
4.1.1
Monitoring and audit of Total
Suspended Particulate (TSP) levels shall be carried out by the ET during the construction
phase of Road A, which include site formation, slope construction and
subsequent roadwork, to ensure that any deteriorating air quality could be
readily detected and timely action taken to rectify the situation.
4.1.2
24-hour and 1-hour Total Suspended
Particulate (TSP) levels shall be measured according to the recommended
programme. 24-hour and 1-hour TSP levels
shall be measured by following the standard high volume sampling method as set
out in Title 40 of the Code of Federal Regulations, Chapter 1 (Part 50),
Appendix B.
4.1.3
Upon approval of the ER on the
advice of EPD, 1-hour TSP levels can alternatively be measured by direct
reading methods which are capable of producing comparable results as that by
the high volume sampling method, to indicate short event impacts. However, the ET should submit sufficient
information to the IC(E) and the ER to prove that the instrument is capable of
achieving a comparable result as that a High Volume Sampler (HVS) and maybe used
for 1-hr sampling.
4.1.4
All relevant data including
temperature, pressure, weather conditions, elapsed-time meter reading for the
start and stop of the sampler, identification and weight of the filter paper,
and other special phenomena and work progress of the concerned site etc. shall
be recorded down in details, where appropriate.
A sample data sheet is shown in .
4.2.1
Regarding the high volume
sampling method, HVS in compliance with the following specifications shall be
used for carrying out the 1-hour and 24-hour TSP monitoring:
1.
0.6-1.7 m3/min.
(20-60 SCFM) adjustable flow range;
2.
Equipped with a timing/control
device with ±5 minutes accuracy for 24 hours
operation;
3.
Installed with elapsed-time
meter with ±2 minutes accuracy for 24 hours
operation;
4.
Capable of providing a minimum
exposed area of 406 cm2 (63 in2);
5.
Flow control accuracy: ±2.5% deviation over 24-hr sampling period;
6.
Equipped with a shelter to
protect the filter and sampler;
7.
Incorporated with an electronic
mass flow rate controller or other equivalent devices;
8.
Equipped with a flow recorder
for continuous monitoring;
9.
Provided with a peaked roof
inlet;
10.
Incorporated with a manometer;
11.
Able to hold and seal the filter
paper to the sampler housing at horizontal position;
12.
Easy to change the filter; and
13.
Capable of operating
continuously for 24-hr period.
4.2.2
If the ET proposes to use a
direct reading dust meter to measure 1-hr TSP levels, he shall submit sufficient
information to the IC(E) to prove that the instruments is capable of achieving
a comparable result as that the HVS and may be used for the 1-hr sampling. The
instrument shall also be calibrated regularly, and the 1-hr sampling shall be
determined periodically by HVS to check the validity and accuracy of the
results measured by direct reading method.
4.2.3
During the course of the
project, the ET is responsible for provision of the monitoring equipment. He
shall ensure that sufficient number of HVSs with an appropriate calibration
kit, and direct reading dust meters are available for the carrying out of
baseline monitoring, regular impact monitoring and ad hoc monitoring.
4.2.4
The HVSs shall be equipped with
an electronic mass flow controller and be calibrated against a traceable
standard at regular intervals. All the
equipment, calibration kit, filter papers, etc. shall be clearly labelled.
4.2.5
Initial calibration of HVSs
shall be conducted upon installation and thereafter at bi-monthly
intervals. The transfer standard shall
be traceable to the internationally recognised primary standard and be
calibrated annually. The calibration data
shall be properly documented for future reference by the concerned parties such
as the IC(E). All the data should be
converted into standard temperature and pressure condition.
4.2.6
The flow-rate of the sampler
before and after the sampling exercise with the filter in position shall be
verified to be constant and be recorded down in the data sheet given in .
4.2.7
Wind data monitoring equipment
shall also be provided and set up at a conspicuous location for logging wind
speed and wind direction near to the dust monitoring locations. The location for equipment installation shall
be proposed by the ET and agreed with the ER and IC(E). For installation and operation of wind data
monitoring equipment, the following points shall be observed:
1.
The wind sensors should be
installed on masts at an elevated level 10m above ground so that they are clear
of obstructions or turbulence caused by the buildings;
2.
The wind data should be
captured by a data logger and to be downloaded for processing at least once a
month;
3.
The wind data monitoring equipment
should be re-calibrated at least once every six months; and
4.
Wind direction should be
divided into 16 sectors of 22.5 degrees each.
4.2.8
In exceptional situations, the
ET may propose alternative methods to obtain representative wind data upon
approval from the ER and agreement from the IC(E).
4.3.1
A clean laboratory with
constant temperature and humidity control, and equipped with necessary
measuring and conditioning instruments, to handle the dust samples collected, shall
be available for sample analysis, and equipment calibration and
maintenance. The laboratory should be
HOKLAS accredited.
4.3.2
If a site laboratory is set up
or a non-HOKLAS accredited laboratory is hired for carrying out the laboratory
analysis, the laboratory equipment shall be approved by the ER in consultation
with the IC(E) and the measurement procedures shall be witnessed by the IC(E)
and the ER. The ET shall provide the ER
with one copy of the Title 40 of the Code of Federal Regulations, Chapter 1 (Part
50), Appendix B for his reference.
4.3.3
Filter paper of size 8”x10”
shall be labelled before sampling. It
shall be a clean filter paper with no pinhole, and shall be conditioned in a humidity
controlled chamber for over 24-hr and be pre-weighed before use for the
sampling.
4.3.4
After sampling, the filter
paper loaded with dust shall be kept in a clean and tightly sealed plastic bag.
The filter paper is then returned to the laboratory for reconditioning in the
humidity controlled chamber followed by accurate weighing by an electronic
balance with readout down to 0.1 mg. The
balance shall be regularly calibrated against a traceable standard.
4.3.5
All the collected samples shall
be kept in a good condition for 6 months before disposal.
4.4.1
The air quality impact
assessment presented in the EIA report indicated that the nearby air sensitive
receivers (ASRs) would not be subjected to adverse dust impact among all phases
of the project when standard dust mitigation measures are properly applied
onsite. The dust mitigation measures
have been recommended and shall be implemented by the Contractor in accordance
with the requirements under the Air Pollution Control (Construction Dust)
Regulation. The Contractor shall be
responsible for the design and implementation of the dust mitigation measures.
4.4.2
shows the locations of the proposed air quality monitoring
locations (AM1 to
AM 7) identified for the air quality monitoring for the three
phases of the construction programme as mentioned in Section 2.2.2. Table 4-1 summarizes the locations of air
quality monitoring stations. The appointed ET may like to propose alternative monitoring
locations taking into consideration of the latest status, availability and/or
accessibility of the various possible monitoring locations. The alternative monitoring locations proposed
by the ET shall be approved by the ER and agreed by IC(E).
Table 4‑1 Locations of Air Quality
Monitoring Stations
|
Monitoring Station ID
|
Category
|
|
|
|
AM1
|
Phase 1
|
|
|
AM2
|
Phase 1
|
|
|
AM3
|
Phase 1
& 2
|
|
|
AM4
|
Phase 2
& 3
|
|
|
AM5
|
Phase 2
|
|
|
AM6
|
Phase 3
|
|
|
AM7
|
Phase 3
|
|
4.4.3
When alternative monitoring
locations are proposed, the following criteria should be followed as far as
practicable:
·
At the site boundary or such
locations close to the major dust emission sources;
·
Close to the sensitive receptors;
and
·
Take into account the
prevailing meteorological conditions.
4.4.4
The ET Leader shall agree with
the ER in consultation with the IC(E) on the position of the HVSs for
installation of the monitoring equipment. When positioning the samplers, the following
points shall be noted:
·
A horizontal platform with
appropriate support to secure the samplers against gusty wind should be
provided;
·
No two samplers should be
placed less than 2 meter apart;
·
The distance between the
sampler and an obstacle, such as buildings, must be at least twice the height
that the obstacle protrudes above the sampler;
·
A minimum of 2 metres of
separation from walls, parapets and penthouses is required for rooftop
samplers;
·
A minimum of 2 metre separation
from any supporting structure, measured horizontally is required;
·
No furnace or incinerator flue
is nearby;
·
Airflow around the sampler is
unrestricted;
·
The sampler is more than 20
metres from the dripline;
·
Any wire fence and gate, to
protect the sampler, should not cause any obstruction during monitoring;
·
Permission must be obtained to
set up the samplers and to obtain access to the monitoring stations; and
·
A secured supply of electricity
is needed to operate the samplers.
4.5.1
Baseline monitoring shall be carried
out by the appointed ET Leader at all of the designated monitoring locations
for at least 14 consecutive days to obtain daily 24-hr TSP samples. 1-hr sampling shall also be done at least 3
times per day during daytime when there are planned construction
activities. The ET Leader should inform
the IC(E) of the baseline monitoring programme before commencement such that
the IC(E) can conduct on-site audit to ensure accuracy of the baseline
monitoring results.
4.5.2
During the baseline monitoring,
there should not be any dust generation construction activities in the vicinity
of the monitoring stations arising from the subject site.
4.5.3
In case the baseline monitoring
cannot be carried out at the designated monitoring locations during the baseline
monitoring period, the ET Leader shall carry out the monitoring at alternative
locations which can effectively represent the baseline conditions at the impact
monitoring locations. The alternative
baseline monitoring locations shall be approved by the ER and agreed with
IC(E).
4.5.4
In exceptional cases, when
insufficient baseline monitoring data or questionable results are obtained, the
ET Leader shall liaise with the IC(E) and EPD to agree on an appropriate set of
data to be used as a baseline reference and submit to ER for approval.
4.5.5
If the ET Leader considers that
the ambient conditions have been changed and a repeat of the baseline
monitoring is required to be carried out for obtaining the updated baseline
levels, the monitoring should be carried out at times when the contractor’s
activities are not generating dust in the proximity of the monitoring
station. Should change in ambient
conditions be determined, the baseline levels and, in turn, the air quality criteria,
should be revised. The revised baseline
levels and air quality criteria should be agreed with the IC(E) and EPD.
4.6.1
The ET Leader shall carry out
impact monitoring during the course of the construction works at the
recommended dust monitoring station. For
regular impact monitoring, a sampling frequency of at least once in every
six-days shall be followed at the selected monitoring stations for 24-hr TSP
monitoring. The specific time to start
and stop the 24-hr TSP monitoring shall be clearly defined and be strictly
followed by the operator. Before
commencement, the ET Leader shall inform the IC(E) of the impact monitoring
programme such that the IC(E) can conduct on-site audit to ensure accuracy of
the impact monitoring results.
4.6.2
For 1-hr TSP monitoring, a sampling
frequency of at least three times in every six-days shall be undertaken
during the hours when the highest dust impact is predicted to occur based on
the nature of the construction works.
The Contractor shall inform the ER, IC(E) and ET Leader in advice the
time when blasting activities are planned for the team to formulate the dust
monitoring programme accordingly. The
1-hr TSP monitoring can be undertaken on the same day as the 24-hr TSP
monitoring.
4.6.3
In case of non-compliance with
the air quality criteria, more frequent monitoring exercise, as specified in
the following section, shall be conducted within 24 hours after the result is
obtained. This additional monitoring
shall be continued until the excessive dust emission or the deterioration in
air quality is rectified.
4.7.1
The baseline monitoring results
form the basis for determining the air quality criteria for the impact
monitoring. The ET shall compare the
impact monitoring results with air quality criteria set up for 24-hour TSP and
1-hour TSP. Table 4-2 shows the
air quality criteria, namely Action and Limit levels to be used. Should non-compliance of the air quality
criteria occurs, the ET shall undertake the relevant action in accordance with
the Action Plan in Table 4-3.
Table 4‑2 Action and Limit Levels for Air Quality
|
Parameters
|
Action
|
Limit
|
|
24 Hour TSP Level in mg/m³
|
For baseline level £ 200 mg/m³, Action level = (Baseline level x 1.3 + Limit
level) /2;
For baseline level > 200 mg/m³, Action level = Limit level;
|
260 mg/m³
|
|
1 Hour TSP Level in mg/m³
|
For baseline level £ 384 mg/m³, Action level = (Baseline level x 1.3 + Limit
level) /2;
For baseline level > 384 mg/m³, Action level = Limit level;
|
500mg/m³
|
Table 4‑3 Event/Action Plan for Air Quality
|
|
ACTION
|
|
EVENT
|
ET Leader
|
IC(E)
|
ER
|
CONTRACTOR
|
|
ACTION
LEVEL
|
|
Exceedance for one sample
|
1. Identify source, investigate the causes of exceedance and propose
remedial measures
2. Inform ER, IC(E) and Contractor
3. Repeat measurement to confirm finding
4. Increase monitoring frequency to daily
|
1. Check monitoring data submitted by ET
2. Check Contractor’s working method
|
1. Notify Contractor
|
1. Rectify any unacceptable practice
2. Amend working methods if appropriate
|
|
Exceedance for two or more consecutive samples
|
1. Identify source, investigate the causes of exceedance and propose
remedial measures
2. Inform ER, IC(E) and Contractor
3. Repeat measurements to confirm findings
4. Increase monitoring frequency to daily
5. Discuss with IC(E) and Contractor on remedial actions
6. If exceedance continues, arrange meeting with IC(E) and ER
7. If exceedance stops, cease additional monitoring
|
1. Checking monitoring data submitted by ET
2. Check Contractor’s working method
3. Discuss with ET Leader and Contractor on possible remedial measures
4. Advise the ER on the effectiveness of the proposed remedial measures
5. Supervisor implementation of remedial measures
|
1. Confirm receipt of notification of failure in writing
2. Notify Contractor
3. Ensure remedial measures properly implemented
|
1. Submit proposals for remedial actions to IC(E) within 3 working days
of notification
2. Implement the agreed proposals
3. Amend proposal if appropriate
|
|
LIMIT LEVEL
|
|
Exceedance for one sample
|
1. Identify source, investigate the causes of exceedance and propose
remedial measures
2. Inform ER, EPD, IC(E) and Contractor
3. Repeat measurement to confirm finding
4. Increase monitoring frequency to daily
5. Assess effectiveness of Contractor's remedial actions and keep IC(E),
EPD and ER informed of the results
|
1. Checking monitoring data submitted by ET
2. Check Contractor’s working method
3. Discuss with ET and Contractor on possible remedial measures
4. Advise the ER on the effectiveness of the proposed remedial measures
5. Supervisor implementation of remedial measures
|
1. Confirm receipt of notification of failure in writing
2. Notify Contractor
3. Ensure remedial measures properly implemented
|
1. Take immediate action to avoid further exceedance
2. Submit proposals for remedial actions to IC(E) within 3 working days
of notification
3. Implement the agreed proposals
4. Amend proposal if appropriate
|
|
Exceedance for two or more consecutive samples
|
1. Identify source, investigate the causes of exceedance and propose
remedial measures
2. Notify ER, EPD, IC(E) and Contractor
3. Repeat measurement to confirm findings
4. Increase monitoring frequency to daily
5. Carry out analysis of Contractor’s working procedures to determine
possible mitigation to be implemented
6. Arrange meeting with IC(E) and ER to discuss the remedial actions to
be taken
7. Assess effectiveness of Contractor's remedial actions and keep IC(E),
EPD and ER informed of the results
8. If exceedance stops, cease additional monitoring
|
1. Discuss amongst ER, ET and Contractor on the potential remedial
actions
2. Review Contractor’s remedial actions whenever necessary to assure their
effectiveness and advise the ER accordingly
3. Supervise the implementation of remedial measures
|
1. Confirm receipt of notification of failure in writing
2. Notify Contractor
3. In consultation with the IC(E), agree with the Contractor on the remedial
measures to be implemented
4. Ensure remedial measures properly implemented
5. If exceedance continues, consider what portion of the work is
responsible and instruct the Contractor to stop that portion of work until
the exceedance is abated
|
1. Take immediate action to avoid further exceedance
2. Submit proposals for remedial actions to IC(E) within 3 working days
of notification
3. Implement the agreed proposals
4. Resubmit proposals if problem still not under control
5. Stop the relevant portion of works as determined by the ER until the
exceedance is abated
|
4.8
Dust Mitigation Measures
4.8.1
The EIA report has recommended
various dust control and mitigation measures.
The following measures are specifically recommended for implementation
together with those presented in the Air Pollution Control (Construction Dust)
Regulation.
General Site Works
1.
Use appropriate working methods
to minimize dust emission;
2.
Ensure all dust control system
are properly functioning during construction operation;
3.
Twice daily watering of all
dust emission sources, adjust frequency depending on meteorological conditions;
4.
Provide hard paved surface for site
area with regular vehicular movements;
5.
Impose a speed limit of 10km/hr
for dump trucks and other vehicles traveling on unpaved site roads;
6.
Cover side and tail boards of
dusty trucks with tarpauline which extends at least 300m over edges of side and
tail boards;
7.
Provide wheel-wash troughs and
hoses at exit points of site;
8.
Arrange truck to unload filling
material to drained ponds directly without stockpiling at site;
9.
Keep filled ponds and stockpile
wet by water spraying;
10. Side enclosure and covering, where practicable, of any aggregate or
other dusty material storage piles to reduce emissions;
11. All dusty material should be sprayed with water immediately prior to
any loading, unloading or transfer operation to minimise dust emission;
12. Instigation of a programme to monitor the construction process in
order to enforce controls and modify methods of work if dusty conditions arise;
and
13. Phasing of dusty construction activities to control dust generation
during the construction period.
4.8.2
The effectiveness of these dust
control measures shall be checked by the EM&A requirements recommended in
the above section. If the measures
adopted and implemented by the contractor are found not be sufficient to keep
dust levels within acceptable levels, the Contractor shall liaise with the ET
Leader on the implementation of some other mitigation measures. The additional
dust mitigation measures shall be approved by the ER before implementation.
5.1.1
The construction noise level
shall be measured in terms of the A-weighted equivalent continuous sound
pressure level (LAeq). LAeq(30
min.) shall be used as the monitoring parameter for the time period
between 0700-1900 hours on normal weekdays.
For all other time periods, LAeq(5 min) shall be employed for
comparison with the NCO criteria.
5.1.2
As supplementary information
for data auditing, statistical results such as L10 and L90
shall
also be obtained for reference. A sample data record sheet is shown in for reference.
5.2.1
As referred to in the Technical
Memorandum issued under the Noise Control Ordinance (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 before and after the noise measurement agree to within
1.0dB.
5.2.2
Noise measurements should be
made in accordance with standard acoustical principles and practices in
relation to weather conditions.
5.2.3
The ET Leader is responsible for
the availability of the monitoring equipment.
He shall ensure that sufficient noise measuring equipment and associated
instrumentation are available for carrying out the baseline monitoring, regular
impact monitoring and ad hoc monitoring.
All the equipment and associated instrumentation shall be clearly
labelled.
5.3.1
The proposed locations for noise monitoring for the
three phases of the construction programme as mentioned in Section
2.2.2, namely NM1 to NM7, are shown in and
summarized in Table 5-1.
Table 5‑1 Locations of Construction Noise
Monitoring Stations
|
Monitoring Station ID
|
Category
|
|
|
|
NM1
|
Phase 1
|
|
|
NM2
|
Phase 1
|
|
|
NM3
|
Phase 1
& 2
|
|
|
NM4
|
Phase 2
& 3
|
|
|
NM5
|
Phase 2
|
|
|
NM6
|
Phase 3
|
|
|
NM7
|
Phase 3
|
|
5.3.2
The appointed ET Leader may
like to propose alternative monitoring locations based on consideration of the latest
status, availability and/or accessibility of the various possible monitoring
locations. Alternative monitoring locations proposed by the ET Leader shall be
approved by the ER and agreed by EPD and the IC(E).
5.3.3
When alternative monitoring locations
are proposed, the monitoring locations should be chosen based on the following
criteria:
·
At locations close to the major
site activities which are likely to have noise impacts;
·
Close to the noise sensitive
receivers; and
·
For monitoring locations located
in the vicinity of the sensitive receivers, care should be taken to cause
minimal disturbance to the occupants during monitoring.
5.3.4
The monitoring station shall
normally be at a point 1m from the exterior of the sensitive receivers building
facade and be at a position 1.2m above ground.
If there is problem with access to the normal monitoring position, an
alternative position may be chosen, and a correction to the measurements shall
be made. For reference, a correction of
+3dB(A) shall be made to free field measurement data. The ET Leader shall agree with the IC(E) on
the monitoring position and the corrections adopted. Once the positions for the monitoring
stations are chosen, the baseline monitoring and the impact monitoring shall be
carried out at the same positions.
5.4.1
Baseline monitoring shall be carried out by the ET prior to the
commencement of the construction works.
The baseline monitoring shall be carried out daily for a period of at
least two weeks. A schedule on the
baseline monitoring for construction noise shall be submitted to the ER for
approval before the commencement of the monitoring.
5.4.2
There shall not be any construction activities in the vicinity of the
stations during the baseline monitoring.
5.4.3
In exceptional cases, such as insufficient baseline monitoring data or
questionable results are obtained, the ET Leader shall liaise with IC(E) and
EPD for agreement on an appropriate set of data to be used as the baseline reference
and submit to the ER for approval.
5.5.1
Noise monitoring shall be
carried out by the ET at the selected representative noise monitoring
stations. The following is an initial
guide on the regular monitoring frequency for each station on a per week basis
when noise generating activities are underway:-
(a) one set of measurement between 0700-1900 hours on normal weekdays
(i.e. Monday to Saturday);
(b) one set of measurement between 1900-2300 hours;
(c) one set of measurement between 2300-0700 hours of next day; and
(d) one set of measurement between 0700-1900 hours on holidays.
5.5.2
For the measurements (b), (c) and (d) above, one set of measurement
shall at least include 3 consecutive Leq(5min) results for construction works to
be carried out during restricted hours.
General construction work carrying out during restricted hours is
controlled by construction noise permit (CNP) system under the NCO. Without a valid
construction noise permit (CNP) issued by EPD under Noise Control Ordinance
(NCO), no construction work shall be carried out during restricted hours. Once a
valid CNP for the construction activities is issued by EPD, the ET Leader shall
be appointed to carry out additional noise measurements and the IC(E) shall
also be appointed to carry out additional site investigations and audits during
the restricted hours specified in the CNP.
5.5.3
Moreover, the ET Leader shall
propose an additional noise monitoring schedule certified by the IC(E) to the
ER for approval before the commencement of the construction works during the
restricted hours.
5.5.4
In case of non-compliance with
the construction noise criteria, more frequent monitoring as specified in the
Action shall be carried out. This additional
monitoring shall be continued until the recorded noise levels are rectified or
proved to be irrelevant to the construction activities.
5.6.1
The Action and Limit Levels for
construction noise are defined in Error! Reference source not found.. In case that a valid CNP is issued by EPD,
the Action Level is the same as the non-restricted hours and the Limit Level
shall be the same as the standard stated in the CNP.
5.6.2
Should non-compliance of the
criteria occurs, actions in accordance with the Action Plan as shown in Table5-3 should be carried out.
Table 5‑2 Action and Limit Levels for Construction Noise
|
Time
Period
|
Action
|
Limit
|
|
0700-1900
hrs on normal weekdays
|
When
one documented complaint is received
|
75*
dB(A)
|
|
Restricted
hours
|
Same
as CNP
|
* Reduce to 70dB(A) for schools and
65dB(A) during school examination periods.
Table 5‑3 Event and Action Plan for Construction Noise Monitoring
|
|
ACTION
|
|
EVENT
|
ET
Leader
|
IC(E)
|
ER
|
CONTRACTOR
|
|
ACTION LEVEL
|
|
Action Level
|
1.
Notify
ER, IC(E) and Contractor
2.
Carry
out investigation
3.
Report
the results of investigation to the ER, IC(E) and Contractor
4.
Discuss
with the IC(E) and Contractor, and formulate remedial measures
5.
Increase
monitoring frequency to check mitigation effectiveness
|
1.
Review
the analysed results submitted by the ET
2.
Review
the proposed remedial measures by the Contractor and advise the ER
accordingly
3.
Supervise
the implementation of remedial measures
|
1.
Confirm
receipt of notification of failure in writing
2.
Notify
Contractor
3.
Require
Contractor to propose remedial measures fro the analysed noise problem
4.
Ensure
remedial measures are properly implemented
|
1.
Submit
noise mitigation proposals to IC(E)
2.
Implement
noise mitigation proposals
|
|
Limit Level
|
1.
Notify
IC(E), ER, EPD and Contractor
2.
Identify
source
3.
Repeat
measurement to confirm findings
4.
Increase
monitoring frequency to daily
5.
Carry
out analysis of Contractor’s working procedures to determine possible
mitigation to be implemented
6.
Inform
IC(E), ER and EPD the causes & actions taken for the exceedances
7.
Assess
effectiveness of Contractor’s remedial actions and keep IC(E), EPD and ER
informed of the results
8.
If
exceedance stops, cease additional monitoring
|
1.
Discuss
amongst ER, ET, and Contractor on the potential remedial actions
2.
Review
Contractor’s remedial actions whenever necessary to assure their
effectiveness and advise the ER accordingly
3.
Supervise
the implementation of remedial measures
|
1.
Confirm
receipt of notification of failure in writing
2.
Notify
Contractor
3.
Require
Contractor to propose remedial measures for the analysed noise problem
4.
Ensure
remedial measures are properly implemented
5.
If exceedance
continues, consider what portion of the work is responsible and instruct the
Contractor to stop that portion of work until the exceedance is abated
|
1.
Take
immediate action to avoid further exceedance
2.
Submit
proposals for remedial actions to IC(E) within 3 working days of notification
3.
Implement
the agreed proposals
4.
Resubmit
proposals if problem still not under control
5.
Stop
the relevant portion of works as determined by the ER until the exceedance is
abated
|
5.7.1
The EIA report has recommended
various construction noise control and mitigation measures. These are
summarised below for easy reference. The
Contractor shall be responsible for
5.7.2
Noise emissions from construction
sites can be minimised by adopting a number of practicable noise mitigation
options, such as:
·
Use of quiet/silenced
equipment;
·
Erecting temporary noise
barriers and Provision of Noise Enclosure;
·
Phasing of the Construction
Activities for the Blasting Restricted Area during Site Formation; and
·
Good site practice and noise
management.
Selecting Quiet/ Silenced PME
5.7.3
Quiet types of equipment for
use in construction activities are available in Hong Kong. It is advised that the contractor should diligently
seek equivalent models of quiet/ silenced PMEs with SWLs similar to or less than
that as presented in the EIA report as far as practicable.
5.7.4
For the types of equipment
presented in Table 5-4 that are likely required in the construction works of the
Project, quiet/silenced plant with SWL that is similar or less than that
presented shall be adopted as far as possible.
Table 5‑4 Quiet/ Silenced
Equipment Inventory
|
Powered Mechanical Equipment
|
SWL of quiet/silenced PME, dB(A)
|
|
Bulldozer
|
104
|
|
Excavator
|
104
|
|
Compactor
|
105
|
|
Dump
truck
|
103
|
|
Grader
|
110
|
|
Piling,
large diameter bored, oscillator
|
115
|
|
Piling,
large diameter bored, reverse circulation drill
|
100
|
|
Generator
|
95
|
|
Mobile
crane
|
101
|
|
Concrete
lorry mixer
|
100
|
|
Concrete
pump
|
109
|
|
Compressor
|
100
|
|
Hoist,
Material
|
95
|
|
Crane (Tower)
|
95
|
|
Steel
bending machine
|
90
|
|
Vibratory
poker
|
98
|
|
Trench
compactor
|
105
|
|
Lorry
|
101
|
|
Asphalt
paver
|
101
|
|
Road
roller
|
101
|
Use of Temporary Noise Barriers and
Acoustic Enclosures
5.7.5
The erection of temporary mobile noise
barriers between noise sources and NSRs will be effective in reducing the potential
construction noise impact, especially for the low-rise village huts which are
the target NSRs to be protected.
5.7.6
The erection of noise barriers
between noise sources and NSRs will be effective in reducing the noise impact,
especially for low-rise residential premises.
When required, temporary barriers of sufficient height (typically 3-5m
high depending on the size of the machines that need to be screened) can be
erected within a few metres from stationary plants, and at practicable distance
from mobile plants operating over a small area or using a well defined route,
to alleviate the construction noise impact. The minimum effective height of the
noise barriers should be such that no part of the noise source will be visible
from the target NSRs to be protected. The guidelines contained in the Booklet
entitled “A Practical Guide for the
Reduction of Noise from Construction Works” issued by EPD have recommended
the design of the temporary acoustic barriers. Barriers/enclosures should have
no openings or gaps, and preferably have a superficial surface density of at
least 10 kg/m2. The locations of the temporary noise barriers shall
be adjusted where necessary taking into consideration the locations of the
noise sources and the NSRs intended to be protected.
5.7.7
Particular attention should be drawn to bored
piling works at the residential area where they are considered the major
construction noise sources. Noise barriers are recommended to be erected close
to the stationary point of piling works during piling to alleviate the
potential noise impact to the adjacent village huts.
5.7.8
To the NSRs along Fuk Shun Street which are represented by
NM4, the widening works of access road is considered the major noise nuisance
during the construction phase. Considering the close proximity of the village
huts (NM4) to the construction site of access road, setting up of a noise
barrier with approximate 3m height between the noise source and those village
huts along Fuk Shun Street
is considered necessary during the construction works of access road.
5.7.9
The contractor shall provide
the designs of such noise barriers/acoustic enclosures certified by the ET
Leader and verified by the IC(E) to EPD for approval prior to the commencement
of the construction works.
Other
Recommended Noise Mitigation Measures
5.7.10
To be prudent in the
construction noise management, the following additional noise mitigation and
good site practices are also recommended for implementation.
1.
The Contractor shall comply
with and observe the Noise Control Ordinance (NCO) and its current subsidiary
regulations;
2.
Before the commencement of any
work, the Contractor shall submit to the Engineer for approval the method of
working, equipment and sound-reducing measures intended to be used at the site;
3.
The Contractor shall devise and
execute working methods that will minimise the noise impact on the surrounding
environment; and shall provide experienced personnel with suitable training to ensure
that these methods are implemented;
4.
Only well-maintained plants
should be operated on-site;
5.
Plants should be serviced
regularly during the construction programme;
6.
Machines that may be in intermittent
use should be shut down or throttled down to a minimum between work periods;
7.
Methods of noise reduction
suggested in BS 5228 Part I: 1997 should be referred. For example, silencer and mufflers on
construction equipment should be utilised and should be properly maintained
during the construction programme;
8.
Noisy activities can be
scheduled to minimise exposure of nearby NSRs to high levels of construction
noise. For example, noisy activities can be scheduled for midday or at times
coinciding with periods of high background noise (such as during peak traffic
hours);
9.
Noisy equipment such as
emergency generators shall always be sited as far away as possible from noise
sensitive receivers;
10.
Mobile plants should be sited as
far away from NSRs as possible; and
11.
Material stockpiles and other
structures should be effectively utilised as noise barrier, where practicable.
6.1.1
The Subject
Site is surrounded by existing fishponds. The Shan
Pui River
and the Tai River are to the east and west of the
Subject Site respectively. The Inner
Deep Bay
area is at the northern side of Subject Site. Potential water quality impact on
these inland water bodies during the construction and operation of the Project
should be minimised.
6.1.2
The
Contractor shall adopt the Best Management Practices (BMPs) in controlling
potential water pollution through following the guidelines for handling and
disposal of construction site drainage as detailed in EPD’s ProPECC Note PN1/94
Construction Site Drainage during the
construction phase. During the
operational phase, the control measures recommended in the EIA as well as in
the Habitat Creation and Management Plan should be implemented.
6.1.3
Water quality monitoring at designated locations in the nearby inland
water bodies are proposed to be carried out during the construction phase to
monitor any sub-standard water discharge into the nearby water bodies from the
site.
6.1.4
Furthermore, since the Subject Site is located in the vicinity of the WNR,
water quality monitoring shall be conducted in the vicinity of the fishpond
areas during both construction and operational phases which contribute to one
of the criteria for ensuring the overall ecological impacts are within
acceptable levels. Details of the ecological monitoring programme
are presented in Section 9 of this EM&A Manual.
6.2.1
Required
construction activities of the development will mainly be land-based. Potential water quality impact could be resulted
from runoff loaded with suspended particulate or other contaminants. The ET should carry out spot check to ensure
that the Contractor has undertaken all recommended control measures to prevent
direct contact of pollutants with rainwater or runoff, and measures to abate
contaminants in the stormwater runoff.
6.2.2
The
parameters
shown in Table 6‑1 are
recommended to be recorded/ monitored in the routine monitoring programme.
Table
6‑1 Water Quality Parameters
|
Phase
|
Water Quality Parameters
|
|
Construction
|
·
Temperature (°C)
·
pH (pH unit)
·
Turbidity (NTU)
·
Water Depth (m)
·
Salinity (mg/L)
·
Dissolved oxygen (DO) (mg/L and
% of saturation)
·
Suspended solids (SS) (mg/L)
|
6.2.3
It is
recommended to carry out sampling at least three times per week to measure turbidity,
suspended solids, dissolved oxygen, pH, salinity and water temperature at a
number of control and monitoring locations recommended below. The monitoring frequency required shall be
reviewed after the first three months and regularly thereafter.
6.2.4
In association, other relevant
data such as monitoring locations/positions, time, water depth, water
temperature, salinity, weather conditions, sea conditions, tidal stage and any
special phenomena and work underways should be recorded. A sample monitoring
record sheet is shown in for reference.
6.3.1
All monitoring equipment shall
be provided by the ET and approved by the ER in consultation with the IE(C).
Dissolved Oxygen and Temperature Measuring Equipment
6.3.2
The instrument shall be a
portable, weatherproof dissolved oxygen measuring instrument complete with cable,
sensor, comprehensive operation manuals, and use a DC power source. It should
be capable of measuring:
·
a dissolved oxygen level in the
range of 0-20 mg/l and 0-200% saturation; and
·
a temperature of 0-45° C.
6.3.3
It shall have a membrane
electrode with automatic temperature compensation complete with a cable.
Sufficient stocks of spare electrodes and cables shall be available for
replacement where necessary (e.g. YSI model 59 meter, YSI 5739 probe, YSI 5795A
submersible stirrer with reel and cable or an approved similar instrument).
6.3.4
Should salinity compensation
not be built-in in the DO equipment, in-situ salinity shall be measured to
calibrate the DO equipment prior to each DO measurement.
Turbidity Measurement Instrument
6.3.5
The instrument shall be a portable,
weatherproof turbidity-measuring instrument complete with comprehensive
operation manual. The equipment shall use a DC power source. It shall have a
photoelectric sensor capable of measuring turbidity between 0-1000 NTU and be
complete with a cable (e.g. Hach model 2100P or an approved similar
instrument).
Suspended Solids
6.3.6
A water sampler comprises a
transparent PVC cylinder, with a capacity of not less than 2 litres and can be
effectively sealed with latex cups at both ends. The sampler shall also have a positive
latching system to keep it open and prevent premature closure until released by
a messenger when the sampler is at the selected water depth (e.g. Kahlsico
Water Sampler or an approved similar instrument).
6.3.7
Water samples for suspended solids
measurement should be collected in high density polythene bottles, packed in
ice (cooled to 4°C without being frozen), and delivered to the laboratory as
soon as possible after collection.
Water Depth Detector
6.3.8
A portable, battery-operated echo
sounder should be used for the determination of water depth at each designated
monitoring station. This unit can either be handheld or affixed to the bottom
of the work boat, if the same vessel is to be used throughout the monitoring
programme.
Salinity
6.3.9
A portable salinometer capable
of measuring salinity in the range of 0-40 ppt shall be provided for measuring
salinity of the water at each monitoring location.
Checking and Calibration of Equipment
6.3.10
A hand-held or boat-fixed type digital
Global Positioning System (GPS) with way point bearing indication or other
equivalent instrument of similar accuracy shall be provided and used during
monitoring to ensure the monitoring vessel is at the correct location before
taking measurements.
6.3.11
All in-situ monitoring
instrument shall be checked, calibrated and certified by a laboratory
accredited under HOKLAS or any other international accreditation scheme before
use, and subsequently re-calibrated at 3 monthly intervals throughout all
stages of the water quality monitoring.
Responses of sensors and electrodes shall be checked with certified
standard solutions before each use. Wet
bulb calibration for a DO meter shall be carried out before measurement at each
monitoring location.
6.3.12
For the on site calibration of
field equipment, the BS 127:1993, "Guide to Field and on-site test methods
for the analysis of waters" shall be observed.
6.3.13
Sufficient stocks of spare
parts shall be maintained for replacements when necessary. Backup monitoring equipment shall also be
made available so that monitoring can proceed uninterrupted even when some
equipment is under maintenance, calibration, etc.
6.4.1
Analysis of suspended solids
shall be carried out in a HOKLAS or other internationally accredited
laboratory. Water samples of about 1,000 ml shall be collected at the
monitoring stations for carrying out the laboratory SS determination. The
detection limit shall be 1 mgL-1 or better.
The SS determination work shall start within 24 hours after collection
of the water samples. The SS determination shall follow APHA 17ed 2540D or
equivalent methods subject to approval of DEP.
6.4.2
The testing laboratory shall be
HOKLAS accredited (or if not, approved by the ER) and comprehensive quality
assurance and control procedures in place in order to ensure quality and
consistency in results.
6.4.3
If a site laboratory is set up,
or a non-HOKLAS and non-international accredited laboratory, is hired for
carrying out the laboratory analysis, the laboratory equipment, analytical
procedures, and quality control shall be approved by the DEP. All the analyses
shall be witnessed by the ER and the IC(E). The ET Leader shall provide the ER and
IC(E) with one copy of the relevant chapters of the "Standard Methods for
the Examination of Water and Wastewater" updated edition and any other
relevant document for his reference.
6.4.4
For the testing methods of
other parameters as recommended by the EIA or required by DEP, detailed testing
methods, pre-treatment procedures, instrument use, Quality Assurance/Quality
Control (QA/QC) details (such as blank, spike recovery, number of duplicate
samples per batch, etc.), detection limits and accuracy shall be submitted to
DEP for approval prior to the commencement of monitoring programme. The QA/QC shall be in accordance with the
requirement of HOKLAS or international accredited scheme. The QA/QC results shall be reported. DEP may also request the laboratory to carry
out analysis of known standards provided by DEP for quality assurance. Additional duplicate samples may be required
by DEP for inter laboratory calibration.
Remaining samples after analysis shall be kept by the laboratory for 3
months in case repeat analysis is required.
If in-house or non-standard methods are proposed, details of the method
verification may also be required to be submitted to DEP. In any circumstance, the sample testing shall
have comprehensive quality assurance and quality control programme. The laboratory shall be prepared to
demonstrate the programmes to DEP or his representatives when requested.
6.5.1
It is recommended to establish control and impact monitoring station approach
to monitor water quality impact during construction phase. Control stations shall be selected to compare
the water quality from potentially impacted sites with the ambient water
quality. Hence, control stations shall
be located within the same water body as the impact monitoring stations but
outside the vicinity of the influence of the works and, as far as practicable,
not affected by any other works.
6.5.2
The proposed water quality monitoring stations are shown in Table 6‑2. The locations
of the control stations (Stations C1 and C2) are set in the inlet points of the
drainage channel “X” and “Y” in the nearby catchment areas respectively. Corresponding impact stations (W1 and W2) are
set at the outfall of drainage channel “X” and “Y”. An additional impact
station W3 was set at the downstream of the Tai
River to monitor the quality of water
discharging into Inner Deep Bay The monitorirng stations W1 and W2 at the
upstream of Tai River can serve the purpose of control
station of W3. presents the
locations of the water quality monitoring stations.
Table
6‑2 Locations of Water Quality
Monitoring Stations
|
Phase
|
Monitoring Station ID
|
Category
|
|
|
|
Construction
|
C1
|
Control Station
|
|
|
C2
|
Control
Station
|
|
|
W1
|
Impact
Station
|
|
|
W2
|
Impact
Station
|
|
|
W3
|
Impact
Station
|
|
6.5.3
It is expected that the exact
locations of the control and monitoring stations may need to be altered subject
to the location of the construction work areas and the wastewater effluent
discharge points from the site. The Contractor shall submit the
wastewater effluent discharge plan as stipulated in the Water Discharge License
to the ET and the ET shall change the corresponding monitoring points in
accordance to the submission. The exact locations of the control and monitoring stations should
also be confirmed by the ET taking into account factors such as accessibility,
suitability, etc. The ET shall seek
approval from the IC(E) and DEP on the monitoring locations proposed prior to
the commencement of the baseline and construction phase sampling programme.
6.5.4
When alternative monitoring
locations are proposed, they should be chosen based on the following criteria:
·
at locations close to and
preferably at the boundary of the mixing zone of the major site activities,
which are likely to have water quality impacts;
·
close to the sensitive
receptors which are directly or likely to be affected;
·
for monitoring locations located
in the vicinity of the sensitive receptors, care should be taken to cause
minimal disturbance during monitoring; and
·
control station shall be
selected at a location to allow a comparison of the water quality at the
potentially impacted site with the ambient water quality. The control station shall be selected such
that it is located within the same body of water as the impact monitoring
station but is located outside the area of influence of the works.
6.5.5
At monitoring stations
coincident with seawater intakes, the measurements should make reference to the
vertical levels of the individual intake pipes.
Where the
water depth is less than 6 m, the mid-depth station may be omitted. Should the water
depth be less than 3m, only the mid-depth station shall be
monitored. The ET Leader shall seek
approval from the IC(E) and DEP on all monitoring station locations. Replicates in situ measurements and sample
collected from each independent sampling event are required for all parameters
to ensure a robust statistically interpretable dataset.
6.6.1
Baseline
conditions of water quality should be established by the ET and agreed with IC(E) and DEP. The purposes of the baseline monitoring are to
establish ambient conditions prior to the commencement of the works, to
demonstrate the suitability of the proposed control and impact monitoring
stations, and for establishment of the action and limit levels.
6.6.2
The
baseline conditions should be established by measuring the water quality
parameters specified in section 6.2.2 above.
The measurements shall be taken at all the designated control
and monitoring stations (i.e. Stations C1 and C2, W1, W2 and W3 respectively),
3 days a week, under two tidal conditions (mid-flood
and mid-ebb) at 3 water depths, namely, 1 m below water surface, mid-depth and
1 m above seabed,
for a period of 4 weeks prior to the commencement of construction works. Where the water depth is less than 6 m, the
mid-depth station may be omitted. Should
be water depth be less than 3 m, only the mid-depth station shall be
monitored. The interval between two sets
of monitoring shall not be less than 36 hours and the baseline monitoring
schedule shall be submitted to EPD at least one week prior to the commencement
of the baseline monitoring. Flow rates
and sample depth shall also be recorded, where appropriate. Also, all seasonal variations such as
rainfall, tidal flow, typhoons and shipping activities shall be assessed. The
target is to collect sufficient data to enable the baseline situation,
including background variation in water quality, to be quantified. Alternative proposal including the sampling
frequencies proposed by the ET should be agreed with IC(E)
and DEP in prior.
6.6.3
There shall not be any major construction activities in the vicinity of
the stations during the baseline monitoring.
6.6.4
In exceptional cases when insufficient
baseline monitoring data or questionable results are obtained, the ET Leader
shall seek approval from EPD on an appropriate set of data to be used as
baseline reference.
6.7.1
During the course of the
construction works, impact monitoring shall be undertaken three days per week, at
mid-flood and mid-ebb tides, with sampling/measurement at the designated
control and monitoring stations (i.e. Stations C1 and C2, W1, W2 and W3 respectively). The interval
between two sets of monitoring shall not be less than 36 hours except where there
are exceedances of Action and/or Limit levels, in which case the monitoring
frequency shall be increased.
6.7.2
Measurement shall be taken at 3
water depths, namely, 1 m below water surface, mid-depth and 1 m above sea bed,
except where the water depth less than 6 m, the mid-depth station may be
omitted. Should the water depth be less
than 3 m, only the mid-depth station shall be monitored.
6.7.3
Upon completion of all
construction activities, a post project monitoring exercise on water quality
shall be carried out for four weeks in the same manner as the impact
monitoring.
6.7.4
Proposed water quality
monitoring schedule shall be faxed to EPD at least 1 week before the first day
of the monitoring month. EPD shall also be
notified immediately for any changes in schedule by fax.
6.8.1
The water quality criteria,
namely Action and Limit levels shall be based on the results of baseline
monitoring, the Water Quality Objectives, or based on the results of
statistical analysis on the difference between impact monitoring results and
30% above control, and/or specific levels defined for the sensitive
receivers. Should non-compliance of the
action or limit levels occurs, the ET should review and identify the potential
source(s) of the impact, devise and implement appropriate mitigate measures in
a collaborative manner. The Action and
Limit Levels for water quality is presented in Table 6‑3.
6.8.2
When the monitoring results of
the water quality parameters at any designated monitoring stations exceed the
water quality criteria, the actions in accordance with the Event and Action
Plan in Table
6‑4 shall be carried out.
Table 6‑3 Typical Action and Limit Levels for Water Quality
|
Parameters
|
Action
|
Limit
|
|
DO in mg/L
(Surface, Middle & Bottom)
|
Surface & Middle
5%-ile of baseline data for surface and middle layer
Bottom
5%-ile of baseline data for bottom layer
|
Surface
& Middle
4
mg/L or 1%-ile of baseline data for surface and middle layer
Bottom
2 mg/L or 1%-ile of
baseline data for bottom layer
|
|
SS in mg/L
(depth-averaged)
|
95%-ile of baseline data or 120% of upstream control station’s SS at
the same tide of the same day
|
99%-ile of baseline, or 130% of upstream control
station's SS at the same tide of the same day and specific sensitive receiver
water quality requirements
|
|
Turbidity (Tby) in NTU
(depth-averaged)
|
95%-ile of baseline data or 120% of upstream control station's Tby at
the same tide of the same day
|
99%-ile of baseline or 130% of upstream control station's Tby at the same
tide of the same day
|
Table 6‑4 Event and Action Plan for Water
Quality Monitoring
|
EVENT
|
ACTION
|
|
ET
|
IC(E)
|
ER
|
CONTRACTOR
|
|
ACTION LEVEL
|
|
Action level being exceeded by one sampling day
|
1.
Repeat in situ measurement to confirm findings;
2.
Repeat in situ measurement to confirm findings;
3.
Identify source(s) of impact;
4.
Inform IC(E), contractor and ER;
5.
Check monitoring data, all plant, equipment and Contractor’s
working methods;
6.
Discuss mitigation measures with IC(E) and Contractor; and
7.
Repeat measurement on next day of exceedance.
|
1.
Discuss with ET and Contractor on the mitigation
measures. Review proposals on
mitigation measures submitted by Contractor and advise the ER accordingly;
and
2.
Assess the effectiveness of the implemented mitigation
measures.
|
1.
Discuss with IC(E) on the proposed
mitigation measures; and
2.
Make agreement on the mitigation measures to be
implemented.
|
1.
Inform the ER and confirm notification of the
non-compliance in writing;
2.
Rectify unacceptable practice;
3.
Check all plant and equipment;
4.
Consider changes of working methods;
5.
Discuss with ET and IC(E) and propose mitigation
measures to IC(E) and ER;
6.
Implement the agreed mitigation measures.
|
|
Action level being exceeded by two or more consecutive
sampling days
|
1.
Repeat in-situ measurement to confirm findings;
2.
Identify source(s) of impact;
3.
Inform IC(E), contractor;
4.
Check monitoring data, all plant, equipment and
Contractor’s working methods;
5.
Discuss mitigation measures with IC(E),
ER and Contractor;
6.
Ensure mitigation measures are implemented;
7.
Prepare to increase the monitoring frequency to daily;
8.
Repeat measurement on next day of exceedance.
|
1. Discuss with ET and Contractor on the mitigation
measures. Review proposals on
mitigation measures submitted by Contractor and advise the ER accordingly;
and
2. Assess the effectiveness
of the implemented mitigation measures.
|
1.
Discuss with IC(E) on the proposed
mitigation measures; and
2.
Make agreement on the mitigation measures to be
implemented.
3.
Assess the effectiveness of the implemented mitigation
measures.
|
1.
Inform the Engineer and confirm notification of the
non-compliance in writing;
2.
Rectify unacceptable practice;
3.
Check all plant and equipment and
4.
Consider changes of working methods;
5.
Discuss with ET and IC(E) and propose mitigation
measures to IC(E) and ER within 3 working days;
6.
Implement the agreed mitigation measures.
|
|
EVENT
|
ACTION
|
|
ET
|
IC(E)
|
ER
|
CONTRACTOR
|
|
LIMIT LEVEL
|
|
Limit level being exceeded by one sampling day
|
1.
Repeat measurement on next of exceedance to confirm
findings;
2.
Identify source(s) of impact;
3.
Inform IC(E), contractor, ER and EPD;
4.
Check monitoring data, all plant, equipment and
Contractor’s working methods;
5.
Discuss mitigation measures with IC(E),
ER and Contractor;
|
1.
Check monitoring data submitted by ET and Contractor’s
working methods;
2.
Discuss with ET and Contractor on possible mitigation measures; and
3.
Review the proposed mitigation measures submitted by
Contractor and advise the ER accordingly.
|
1.
Confirm receipt of notification of failure in writing;
2.
Discuss with IC(E), ET and Contractor on
the proposed mitigation;
3.
Request Contractor to view the working methods; and
4.
Ensure mitigation measures are properly implemented.
|
1.
Inform the ER and confirm notification of the
non-compliance in writing;
2.
Rectify unacceptable practice;
3.
Check all plant and equipment and consider changes of
working methods;
4.
Discuss with ET, IC(E) and ER and propose
mitigation measures to ER and IC(E) within 3 working days;
and
5.
Implement the agreed mitigation measures.
|
|
Limit level being
exceeded by two or more consecutive sampling days
|
1.
Repeat measurement on next of exceedance to confirm
findings;
2.
Identify source(s) of impact;
3.
Inform IC(E), contractor, ER and EPD;
4.
Check monitoring data, all plant, equipment and
Contractor’s working methods;
5.
Discuss mitigation measures with IC(E),
ER and Contractor;
6.
Ensure mitigation measures are implemented; and
7.
Increase the monitoring frequency to daily until no
exceedance of Limit level for two consecutive days.
|
1.
Check monitoring data submitted by ET and Contractor’s
working methods.
2.
Discuss with ET and Contractor on possible mitigation
measures;
3.
Review the proposed mitigation measures submitted by
Contractor and advise the ER accordingly; and
4.
Supervise the implementation of mitigation measures.
|
1.
Discuss with IC(E), ET and Contractor on
the proposed mitigation measures;
2.
Request Contractor to critically review the working
methods;
3.
Make agreement on the mitigation measures to be
implemented;
4.
Ensure mitigation measures are properly implemented; and
5.
Consider and instruct, if necessary, the Contractor to slow
down or to stop all or part of the construction activities until no
exceedance of Limit level.
|
1.
Take immediate action to avoid further exceedance
2.
Discuss with ET, IC(E) and ER and propose
mitigation measures to ER and IC(E) within 3 working days;
3.
Implement the agreed mitigation measures;
4.
Resubmit proposals of mitigation measures if problem still
not under control; and
5.
As directed by the Engineer, to slow down or to stop all
or part of the construction activities until no exceedance of Limit level.
|
6.9.1
The EIA report has recommended
mitigation measures during the construction and operational phases of the
Project. The implementation schedule for
the recommended mitigation measures is presented in Appendix I.
Construction Phase
6.9.2
Control of potential water
quality impact arising from the construction works shall be implemented based
on the following principles:
·
Minimisation of runoff;
·
Prevention or minimisation of
the likelihood of the identified pollutants being in contact with rainfall or
runoff; and
·
Measures to abate pollutants in
the stormwater runoff.
6.9.3
Surface runoff and pollutant
could be minimised by scheduling the foundation and WNR construction works
during the dry seasons only (i.e. from December to April of the next year).
During the dry seasons, the fishponds will have maximum spare capacity to allow
temporary storage of pond water during re-profiling of the WNR so as to avoid
the discharge of pond water. The Contractor should make best use of existing
ponds for the purpose of temporary storage during bunds removal and realignment
upon the construction of WNR. In addition, stormwater runoff will be reduced to
minimum.
6.9.4
Besides, the Best Management
Practices (BMPs) will be implemented in controlling water pollution during the
construction phase. The guidelines for handling and disposal of construction
site discharges as detailed in EPD’s ProPECC Note PN1/94 “Construction Site Drainage”
will be followed. The water pollution control measures that are considered most
relevant to this Project are listed below which should be implemented by the
Contractor during the execution of the site formation and road works, where
practicable:
Runoff from Construction Site
1.
High loading of suspended
solids (SS) in construction site runoff shall be prevented through proper site
management by the Contractor;
2.
The boundary of critical work
areas shall be surrounded by ditches or embankment. Accidental release of soil or refuse into the
adjoining land should be prevented by the provision of site hoarding or earth
bunds, etc. at the site boundary. These
facilities should be constructed in advance of site formation works and
roadworks;
3.
Consideration should be given
to plan construction activities to allow the use of natural topography of the
site as a barrier to minimise uncontrolled non-point source discharge of
construction site runoff;
4.
Temporary ditches, earth bunds
should be provided to facilitate directed and controlled discharge of runoff
into storm drains via sand/ silt removal facilities such as sand traps, silt
traps and sediment retention basin. Oil
and grease removal facilities should also be provided where appropriate, for example,
in area near plant workshop/ maintenance areas;
5.
Sand and silt removal
facilities, channels and manholes should be maintained and the deposited silt
and grit should be removed regularly by the contractor, and at the onset of and
after each rainstorm to ensure that these facilities area functioning properly;
6.
Slope exposure should be
minimised where practicable especially during the wet season. Exposed soil
surfaces should be protected from rainfall through covering temporarily exposed
slope surfaces or stockpiles with tarpaulin or the like;
7.
Access roads should be
protected by crushed rock, gravel or other granular materials to minimise
discharge of contaminated runoff;
8.
Slow down water run-off flowing
across exposed soil surfaces;
9.
Plant workshop/ maintenance
areas should be bunded and constructed on a hard standing. Sediment traps and
oil interceptors should be provided at appropriate locations;
10.
Manholes (including newly
constructed ones) should be adequately covered or temporarily sealed so as to
prevent silt, construction materials or debris from getting into the drainage
system;
11.
Construction works should be
programmed to minimise soil excavation works where practicable during rainy
conditions;
12.
Chemical stores should be contained
(bunded) to prevent any spills from contact with water bodies. All fuel tanks and/ or storage areas should
provided with locks and be sited on hard surface;
13.
Chemical waste arising from the
site should be properly stored, handled, treated and disposed of in compliance
with the requirements stipulated under the Waste Disposal (Chemical Waste)
(General) Regulation;
14.
Drainage facilities must be
adequate for the controlled release of storm flows.
15.
Dredged materials requiring
temporary storage on-site (for filling of marshland afterwards) should be
securely stored and covered, if possible. Dried up mud materials can then be
used for marshland formation.
Wastewater from Construction Site
1.
Sewage generated from the
construction workforce should be contained in chemical toilets before
connection to public foul sewer can be provided. Chemical toilets should be provided at a
minimum rate of about 1 per 50 workers. The facility should be serviced and
cleaned by a specialist contractor at regular intervals;
2.
Foul water from canteens should
also be contained by chemical toilets before connection to public foul sewer
can be provided;
3.
Vehicle wheel washing facilities
should be provided at the site exit such that mud, debris, etc. deposited onto
the vehicle wheels or body can be washed off before the vehicles are leaving
the site area;
4.
Section of the road between the
wheel washing bay and the public road should be paved with backfill to reduce
vehicle tracking of soil and to prevent site run-off from entering public road
drains;
5.
Bentonite slurries used in
diaphragm wall and bore-pile construction, etc. should be reconditioned and
reused as far as practicable. Spent
bentonite should be kept in a separate slurry collection system for disposal at
a marine spoil grounds subject to obtaining a marine dumping licence from EPD. If used bentonite slurry is to be disposed of
through public drainage system, it should be treated to meet the respective
applicable effluent standards for discharges into sewers, storm drains or the
receiving waters.
Oils and Solvents
1.
Spillage of fuel oils or other polluting
fluids should be prevented at source. It
is recommended that all stocks should be stored inside proper containers and
sited on sealed areas, preferably surrounded by bunds.
Draining of Fishpond Water
1.
Through transferring the pond
water within the subject site, the need of discharging pond water into the
surrounding water bodies during the construction of the Project can be
minimized.
2.
Any draining of fishpond water
should be handled with prudence. Water quality should be checked and monitored to ensure that relevant
water quality criteria can be complied with the requirements as stipulated in
the EM&A programme.
3.
Sedimentation tanks should be
set up at the construction site so that water to be discharged can be retained
for sedimentation if any discharging activity is considered necessary.
Operational Phase
6.9.5
The project proponent or the
developer shall be responsible for the following measures:
Residential Development and Access Road
6.9.6
All domestic sewage generated
will be discharged to the public sewerage. The drainage system will be designed
to avoid any case of flooding based on the 1 in 50 years scenario with
provision of treatment facilities including sand traps and oil interceptors.
Temporary buffer containers should be provided to retain wastewater in case
emergency discharge from sewage pump houses and sewer bursting discharge occur
as a contingency measure.
6.9.7
Regular cleaning and sweeping of
the access road and other paved areas are suggested so as to minimise exposure
of pollutants to stormwater. Stormwater gullies and ditches provided along the
access road and among the residential development will be regularly inspected.
6.9.8
Planter strips are provided
along the access road and around the residential development where practicable.
In the event of emergency (e.g. car accident) where there is a major spillage
of oil, chemical or fuel, dispersants or fire fighting foam, etc., a system of
contaminant bunding is recommended as far as practicable.
Wetland Nature Reserve
6.9.9
Best management practice will
be adopted for the maintenance of the wetland and fishpond areas. Regular
maintenance of fishponds will be exercised to remove excessive nutrients. Fish
species will be carefully selected and the quantity will be controlled to avoid
excessive fish farming as usually happened before the development of the
Project.
6.9.10
A Wetland Nature Reserve management
plan has been devised. No application of herbicides, or pesticides is
considered necessary. Re-circulation pumping system will be provided for
circulation of water between ponds and in turn to reduce the likelihood of
overflowing of ponds due to even distribution of water volume.
6.9.11
Fishponds in the WNR will be
self-contained. During normal operation, under the management of conservation
manager, pond water will only be transferred within the WNR and the likelihood
of pond water discharge will be minimal.
6.9.12
The temporary storage of water
at the storage pond can allow sedimentation and removal of pollutants before
discharge. It is particularly useful prior to wet season as cleaner water will
be discharged to allow spare capacity for rainstorm.
6.9.13
The way to avoid overflow by
intentional discharge upon the water quality, for example, is also recommended.
Reed bed and alike can be provided in the marshland area to reduce nutrient
discharge.
Mitigation Implementation Schedule
6.9.14
The implementation schedules of mitigation measures for water quality
control during construction and operational phases are presented in Appendix I.
6.9.15
The effectiveness of these water quality control measures shall be checked by the EM&A requirements
recommended in the above section. If the
above measures
are not sufficient to restore the water quality to an acceptable levels, the
Contractor (during construction) or the project proponent (during operational
phase) shall liaise with the ET Leader, propose to ER, and IC(E) for
approval, on the implementation of some other
mitigation measures.
7.1.1
The Contractor is responsible
for proper handling of construction and demolition material (C&DM), chemical
waste and general refuse within the construction site, for disposal offsite,
and to implement measures to minimise waste generation.
7.2.1
The overall construction
management strategy shall be minimisation of waste generation, coupled with
maximum reuse and recycling of construction and demolition materials onsite or
offsite as far as practicable. Contract
requirements should include the responsibilities of the Contractor for waste
collection and disposal. The following
measures are recommended at this planning stage for proper handling of waste
material during the construction phase.
Waste
Management Plan
7.2.2
To ensure the appropriate
handling of the C&DM, it is recommended that a Waste Management Plan (WMP) shall
be proposed by the Contractor at the commencement of the construction works.
The WMP should be developed taking into account the recommended control
measures given in the EIA Report for the Project, which are summarised below. The WMP shall be submitted to the Engineer at
the commencement of the Project for approval and submission to EPD as per the
requirement of the Environmental Permit.
Overall Waste
Management
7.2.3
Storage areas for different
waste types - different types of waste should be segregated and stored in
different containers, skips or stockpiles to enhance reuse or recycling of
materials and their proper disposal. An
on-site temporary storage area equipped with required control measures (e.g.
dust) should be provided;
7.2.4
Trip-ticket system - in order
to monitor the disposal of inert C&DM at public filling facilities and the
remaining C&D waste to landfills, and control fly-topping, a trip-ticket
system should be included as a contractual requirements and audited by the
Environmental Team;
7.2.5
Records of Wastes - a recording
system for the amount of wastes generated, recycled and disposed (including the
disposal sites) should be proposed;
7.2.6
Training - training should be
provided to workers in respect of site cleanliness and appropriate waste management
procedure, including waste reduction, reuse and recycling, and avoid
contamination of reusable C&DM.
Construction
& Demolition Material
7.2.7
“Selective demolition” approach
is recommended to facilitate to avoid the mixing of reusable/ recyclable
material with the waste requiring disposal;
7.2.8
Construction waste such as used
wood from framework, surplus concrete, etc. is not expected to be in large
quantity due to the nature of the roadwork;
7.2.9
Generation of surplus construction
material is recommended to be minimised by the Contractor through careful
design, planning, good site management, control of ordering procedures,
segregation and reuse of material;
7.2.10
Maximise the reuse
opportunities of excavated material onsite;
7.2.11
Proper disposal of inert
excavated material offsite to public filling areas.
Chemical Waste
7.2.12
Chemical material generated
shall be recycled/ reused onsite/ offsite as far as practicable;
7.2.13
Chemical waste requiring disposal
shall be handled, collected and delivered to the Tsing Yi Chemical Waste
Treatment Facility in accordance with the Waste Disposal (Chemical Waste)
(General) Regulation.
General Refuse
7.2.14
General refuse shall be properly
handled, collected and disposed of to avoid cross contamination and minimise
potential odour, pest and litter impacts.
8.1.1
The
EIA has recommended the EM&A for landscape and visual resources is
undertaken during the design, construction and operational phases of the
project. The design, implementation and
maintenance of landscape mitigation measures is a key aspect of this and should
be checked to ensure that they are fully realised and that potential conflicts
between the proposed landscape measures and any other project works and
operational requirements are resolved at the earliest possible date and without
compromise to the intention of the mitigation measures. In addition, implementation of the mitigation
measures recommended by the EIA will be monitored through the site audit
programme.
8.2.1
The
Landscape and Visual Assessment of the EIA recommended a series of mitigation measures
for both the construction and operation phases to ameliorate the landscape and
visual impacts of the Project. These
measures include the following as shown in Table 8‑1 and Table 8‑2,
which are also summarised in the environmental mitigation implementation
schedules provided in Appendix I:
Table 8‑1 Proposed
Construction Stage Mitigation Measures
|
Mit. Code
|
Mitigation Measure
|
|
CP1
|
Preservation
of Existing Vegetation - The development proposals would avoid disturbance
to the existing trees as far as practicable within the confines of both the
development site, Southern Development Access and the proposed Wetland Nature
Reserve (WNR). It is recommended that a full tree survey and felling
application will be undertaken and submitted for approval by the relevant
government departments in accordance with WBTC No. 03/2006, Management and
Maintenance of Natural Vegetation and Landscape Works, and Tree Preservation
during the detailed design phase of the project. Where possible all trees
which are not in conflict with the proposals would be retained and shall be protected
by means of fencing where appropriate to prevent potential damage to tree
canopies and root zones from vehicles and storage of materials.
Specifications for the protection of existing trees will be circulated for
approval by the relevant government authorities during the preparation of the
detailed tree survey.
|
|
CP2
|
Preservation
of Existing Topsoil - Topsoil disturbed during
the construction phase will be tested using a standard soil testing
methodology and where it is found to be worthy of retention stored for
re-use. The soil will be stockpiled to a maximum height of 2m and will be either temporarily
vegetated with hydroseeded grass during construction or covered with a
waterproof covering to prevent erosion. The stockpile should be turned over
on a regular basis to avoid acidification and the degradation of the organic
material, and reused after completion. Alternatively, if this is not
practicable, it should be considered for use elsewhere, including other
projects.
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CP3
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Development
Site and Temporary Works Areas - The landscape of these works areas would be
restored following the completion of the construction phase. Construction
site controls shall be enforced, where possible, to ensure that the landscape
and visual impacts arising from the construction phase activities are
minimised including the storage of materials, the location and appearance of
site accommodation and the careful design of site lighting to prevent light
spillage. Screen hoarding may not be a practicable for this project due to
the viewing distances involved and the elevated viewing position of the
majority of VSRs.
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CP4
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Mitigation
Planting - Replanting of disturbed vegetation
should be undertaken at the earliest possible stage of the construction phase
of the project and this should use predominantly native plant species. All
imported plants should be quarantined in local nursery for a minimum of 1
month to check there are no symptoms of infection by pests or diseases prior
to planting on site. It
is proposed that the origin of the trees be established through site visits
to the nursery. In addition, certain
trees will be brought to a temporary holding nursery at a small size as
early in the construction period as possible and grown to the semi-mature
size required as part of the proposed mitigation planting. This nursery will
be located either on site or within the local area.
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CP5
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Transplantation
of Existing Trees - Existing trees to be transplanted
as shown in the Landscape Master Plan (approximately
28 trees), final recipient site will
subject to the findings of the detailed tree survey and felling application
undertaken at the detailed design stage
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Table 8‑2 Proposed Operational Stage Mitigation Measures
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Mit. Code
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Mitigation Measure
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OP1
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Design of
Built Development - the proposed residential development will incorporate design
features including:
·
Stepped building height
principle
– The proposed residential blocks for Option 1A will range in height from 14 to 18 floors fronted
by low-rise buildings in order to provide a greater sense of visual
integration with the existing landscape context and mirror the form of the
existing landform particularly the ridgeline to the south of the development
site. The proposed built form will also provide a more visually interesting
architectural form contrasting with the abrupt nature of the existing
development associated with Tin Shui Wai. Whereas Option 1B will adopt a
common height (15 storeys) for the blocks which will also be fronted by
low-rise buildings which also serve to enhance the development’s visual
integration.
·
Building massing and
permeable development facade - the proposed use of slightly higher building
blocks for Option 1A has
allowed the incorporation of significant view corridors and the creation of
voids in the façade of each of the blocks allowing views through the development
to the green backdrop formed by the wooded hillsides to the south. These view
corridors and viods within the façade of each block also allow the
development to avoid the walling effect evident in the existing developments
to the south and west particularly when viewed from locations such as the
development in the northern part of Tin Shui Wai. The adoption of a slightly
lower building height for Option 1B will require the introduction of one
additional block and a subsequent reduction in the width of the proposed view
corridors.
·
Maintenance of existing
ridgeline and green backdrop – the proposed development form allows the
maintenance of the existing ridgeline and green backdrop to the south of the
development site even in relatively close views. This is achieved in Options 1A and 1B through a combination of the
building heights and the creation of the view corridors.
·
Colour treatment of
building facades - the architectural design for both Option 1A and 1B seeks to reduce the apparent
visual mass of the development further through the use of colour blocking
utilising range of visually recessive earth colours and tones on the facades
of the different blocks.
·
Underground car parking - the proposed
development for Options 1A
and 1B will utilise underground car
parking in order to maximise the area available for landscaping and minimise
potential impacts of extensive hard surfaced areas in elevated views both
within and without the development site.
·
Responsive building finishes - In terms of the building
finishes for Options 1A
and 1B natural tones should be considered for the colour palette with
non-reflective finishes are recommended on the outward facing building
facades to reduce glare effect.
·
Responsive lighting design – Aesthetic design of architectural
and road lighting with following glare design measures:
-
Directional and full cut off lighting is recommended
particularly for recreation and roadside areas to minimise light spillage to
the surrounding areas.
-
Minimise geographical spread of lighting, only applied for
safety at the key access points and staircases;
-
Limited lighting intensity to meet the minimum safety and
operation requirement; and
-
High pressure sodium road lighting is recommended for more
stringent light control reducing spillage and thus visual impacts.
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OP2
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Landscape
Buffer Planting – According to the guidelines provided in the Final Report of the
Fish Pond Study at Deep Bay Area, the buffer area will extend around the periphery
of the development to the proposed marsh habitat in WNR providing screening
of the development at low levels and creating a transitional structure, not
less than 50m wide,
between the low-lying fishponds of the WNR and the upright forms of the proposed
built development. This planting in addition to the proposed bamboo planting
proposed as part of the ecological mitigation measures will also serve to
visually integrate the proposals into the existing landscape framework. The buffer will utilise native tree species
to link where possible to the existing wooded areas with the advantage of
creating a more coherent landscape framework whilst also improving the
ecological connectivity between existing woodland habitats. A woodland
management programme will be employed during the operational phase of the
project with the objective of conserving and enhancing the ecological
interest (approximate area 3750 square metres equating to 750 trees at 2.5m planting centres).
Apart from the landscape
buffer planting, some limited tree clusters will be planted on bunds within
the WNR to facilitate the establishment of habitat for different
bird species. The primary objective of the tree planting within the WNR
will be ecological in the creation of a favourable habitat for birds rather
than for amenity purposes. As such within the fishpond or freshwater
marshland area, trees will be planted in small clusters in positions designed
not to intrude upon the bird flight lines, create enclosure or shade the
marshland and fishponds. Some fruit-bearing trees, such as Ficus hispida, Ficus microcarpa and Melia
azedarach, are recommended from ecological perspectives to enhance
foraging opportunities for some bird species. Whilst wide canopied tree
species such as Ficus microcarpa in
combination with bamboo species such as Bambusa
eutuldoides are recommended to be planted at the edge of the alternative
egretry I in order to provide a favourable habitat for the egrets and screen
the area from human activity.
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OP3
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Landscape
Strategy for the Design of Amenity Space - The proposals are described in detail below (approximate
area 3.4 ha).
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OP4
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Compensatory Planting Proposals - the planting
proposals for the residential amenity areas and landscape woodland buffer areas
presented as Figure 11-12, Landscape Master Plan include some 300 new
specimen trees in addition to the 3750 square metres of mass woodland
planting described under OP2 above would be established within the project
boundary. The proposed planting of some 1050 trees will result in a
compensatory planting ratio of 2.6:1 (new tree planting: trees recommended
for felling). This compares favourably with the report's assertion that some
399 trees would be felled due to the proposals in this area. Following the
retention of existing trees, the successful establishment of newly planted
trees and the transplantation of some of the existing trees, the project area
will contain approximately 1316 trees. Trees forming part of the landscape
buffer area will utilise species native to Hong Kong
while the species selection for the areas within the development site will
respond to the landscape concept for the area. These proposals will be
subject to the detailed design stage of the project.
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OP5
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Southern
Development Access – the landscape of the road
corridor will be restored to its existing condition following the completion
of the road enhancement works.
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8.3.1
The
landscape measures proposed within the EIA to mitigate the landscape and visual
impacts of the scheme should be embodied into the detailed landscape design
drawings and contract documents including the protection of existing trees
where possible, the transplanting of existing trees and the planting of new
trees and shrubs. Designs should be
checked to ensure that the measures are fully incorporated and that potential
conflicts with building, civil engineering, geo-technical, structural,
lighting, signage, drainage, underground utility and operational requirements
are resolved prior to construction.
8.3.2
The
design phase EM&A requirements for landscape and visual resources comprise
the audit of the detailed landscaping and visual specifications to be prepared
during the detailed design together with ensuring that the design is sensitive
to landscape and visual impacts and that landscape resources are retained as
far as practicable. Monitoring of design
works against the recommendations of the landscape and visual impact
assessments within the EIA should be undertaken as and when the designs are
produced to ensure that they fulfil the intentions of the mitigation measures.
8.3.3 The landscape and visual auditor shall
review the designs as and when they are prepared and liaise with the landscape
architect and design engineer to ensure all measures have been incorporated in
the design in a format that can be specified to the Contractor for
implementation. In the event of a
non conformity, the Event/Action plan as detailed in Table 8‑3
below should be followed.
Table 8‑3 Event /
Action Plan for Design Phase
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Action Level
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Landscape
and Visual Auditor
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Project Architect
(PA)/ Project Engineer (PE)
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Project
Landscape Architect (PLA)
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Non Conformity (with Design Standards and Specification)
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1.
Identify Source;
2.
Inform PA, PE and PLA;
3.
Discuss remedial actions with PA,PE, PLA; and
4.
Verify remedial actions when complete.
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1.
Amend building or engineering designs;
2.
Notify PLA;
3.
Discuss remedial actions with PLA; and
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