CONTENTS
Page No.
1. INTRODUCTION 1
1.1 Purpose of the Manual 1
1.2 Review of the EM&A Manual 2
1.3 Background 2
1.4 Site Location 2
1.5 Sensitive Receivers 2
1.6 Environmental Monitoring and Audit Requirements 2
1.7 Project Organisation 2
1.8 Construction Programme 4
2. AIR QUALITY 5
2.1 Introduction 5
2.2 Dust Mitigation Measures 5
2.3 Environmental Monitoring & Audit 7
3. NOISE 8
3.1 Introduction 8
3.2 Event and Action Plan for Noise 8
3.3 Noise Mitigation Measures 10
3.3.1 Good Site Practice 10
3.3.2 Selecting Quieter Plant and Working Methods 10
3.4 Environmental
Monitoring & Audit 11
4. WATER QUALITY 12
4.1 Introduction 12
4.2 Water Quality Parameters 12
4.3 Monitoring Equipment 12
4.3.1 Dissolved Oxygen and Temperature Measuring Equipment 12
4.3.2 Turbidity Measurement Instrument 12
4.3.3 Sample Containers and Storage 12
4.3.4 Calibration of In-Situ Instruments 13
4.3.5 Laboratory Measurement/Analysis 13
4.4 Monitoring Locations 13
4.5 Baseline Monitoring 14
4.6 Impact Monitoring 14
4.7 Event and Action Plan for Water Quality 15
4.8 Mitigation Measures 18
4.9 Environmental Monitoring & Audit 20
4.10 Groundwater
Monitoring 22
4.10.1 Impact on Loss of Groundwater 22
4.10.2 Mitigation Measures 22
4.10.3 Environmental Monitoring & Audit 22
5. FISHERIES 24
5.1 Introduction 24
5.2 Mitigation Measures 24
6. ECOLOGY 25
6.1 Introduction 25
6.2 Mitigation Measures 25
6.2.1 Terrestrial Ecology 25
6.2.2 Marine Ecology 25
6.3 Environmental Monitoring & Audit 26
7. CULTURAL HERITAGE 27
7.1 Introduction 27
7.2 Recommended Mitigation Measures 27
7.3 Environmental Monitoring & Audit 27
8. LANDSCAPE AND VISUAL IMPACTS 29
8.1 Introduction 29
8.2 Mitigation Measures 29
9. WASTE MANAGEMENT 31
9.1 Introduction 31
9.2 Waste Mitigation Measures 31
9.3 Environmental Monitoring & Audit 33
10. health 34
10.1 Introduction 34
10.2 Monitoring Requirements 34
11. SITE ENVIRONMENTAL AUDIT 35
11.1 Site Inspections 35
11.2 Compliance with Legal and
Contractual Requirements 36
11.3 Environmental Complaints 36
12. REPORTING 38
12.1 General 38
12.2 Baseline Monitoring Report 38
12.3 EM&A Reports 39
12.4 Data Keeping 44
12.5 Interim Notifications of
Environmental Quality Limit Exceedances 44
112222224555788810101011121212121212121313131414151820222222222424242525252525262727272729292931313133343434353536363838383944441. INTRODUCTION 1
1.1 Purpose of the Manual 1
1.2 Review of the EM&A Manaul 2
1.3 Background 2
1.4 Site Location 2
1.5 Sensitive Receivers 2
1.6 Environmental Monitoring and Audit
Requirements 2
1.7 Project Organisation 2
1.8 Construction Programme 3
2. AIR
QUALITY 4
2.1 Introduction 4
2.2 Dust Mitigation Measures 4
2.3 Environmental Monitoring & Audit 6
3. NOISE 7
3.1 Introduction 7
3.2 Event and Action Plan for Noise 7
3.3 Noise Mitigation Measures 9
3.3.1 Good Site Practice 9
3.3.2 Selecting Quieter Plant and Working Methods 9
3.4 Environmental
Monitoring & Audit 10
4. WATER
QUALITY 11
4.1 Introduction 11
4.2 Water Quality Parameters 11
4.3 Monitoring Equipment 11
4.3.1 Dissolved Oxygen and Temperature Measuring
Equipment 11
4.3.2 Turbidity Measurement Instrument 11
4.3.3 Sample Containers and Storage 11
4.3.4 Calibration of In-Situ Instruments 12
4.3.5 Laboratory Measurement/Analysis 12
4.4 Monitoring Locations 12
4.5 Baseline Monitoring 13
4.6 Impact Monitoring 13
4.7 Event and Action Plan for Water Quality 14
4.8 Mitigation Measures 16
4.9 Environmental Monitoring & Audit 18
4.10 Groundwater
Monitoring 19
5. FISHERIES 20
5.1 Introduction 20
5.2 Mitigation Measures 20
6. ECOLOGY 21
6.1 Introduction 21
6.2 Mitigation Measures 21
6.2.1 Terrestrial Ecology 21
6.2.2 Marine Ecology 21
6.3 Environmental Monitoring & Audit 22
7. CULTURAL
HERITAGE 23
7.1 Introduction 23
7.2 Recommended Mitigation Measures 23
7.3 Environmental Monitoring & Audit 23
8. LANDSCAPE
AND VISUAL IMPACTS 25
8.1 Introduction 25
8.2 Mitigation Measures 25
9. WASTE MANAGEMENT 27
9.1 Introduction 27
9.2 Waste Mitigation Measures 27
9.3 Environmental Monitoring & Audit 29
10. health 30
10.1 Introduction 30
10.2 Monitoring
Requirements 30
11. SITE
ENVIRONMENTAL AUDIT 31
11.1 Site
Inspections 31
11.2 Compliance
with Legal and Contractual Requirements 32
11.3 Environmental
Complaints 32
12. REPORTING 34
12.1 General 34
12.2 Baseline
Monitoring Report 34
12.3 EM&A
Reports 35
12.4 Data
Keeping 40
12.5 Interim
Notifications of Environmental Quality Limit Exceedances 40
1. INTRODUCTION
1.1 Purpose of the Manual
1.2 Review of the EM&A Manual
1.3 Background
1.2 Background
1.43 Site Location
1.54 Sensitive Receivers
1.65 Environmental Monitoring and Audit
Requirements
1.76 Project Organisation
1.87 Construction Programme
2. AIR
QUALITY
2.1 Introduction
2.2 Dust Mitigation Measures
2.3 Environmental Monitoring & Audit
3. NOISE
3.1 Introduction
3.2 Event and Action Plan for Noise
3.3 Noise Mitigation Measures
3.3.1 Good Site Practice
3.3.2 Selecting Quieter Plant and Working Methods
3.4 Environmental
Monitoring & Audit
4. WATER
QUALITY
4.1 Introduction
4.2 Water Quality Parameters
4.3 Monitoring Equipment
4.3.1 Dissolved Oxygen and Temperature Measuring
Equipment
4.3.2 Turbidity Measurement Instrument
4.3.3 Sample Containers and Storage
4.3.4 Calibration of In-Situ Instruments
4.3.5 Laboratory Measurement/Analysis
4.4 Monitoring Locations
4.5 Baseline Monitoring 12
4.6 Impact Monitoring
4.7 Event and Action Plan for Water Quality 13
4.8 Mitigation Measures 17
4.9 Environmental Monitoring & Audit 19
4.10 Groundwater
Monitoring 20
5. FISHERIES 21
5.1 Introduction 21
5.2 Mitigation Measures 21
6. ECOLOGY 22
6.1 Introduction 22
6.2 Mitigation Measures 22
6.2.1 Terrestrial Ecology 22
6.2.2 Marine Ecology 22
6.3 Environmental Monitoring & Audit 23
7. CULTURAL
HERITAGE 24
7.1 Introduction 24
7.2 Recommended Mitigation Measures 24
7.3 Environmental Monitoring & Audit 24
8. LANDSCAPE
AND VISUAL IMPACTS 26
8.1 Introduction 26
8.2 Mitigation Measures 26
9. WASTE MANAGEMENT 28
9.1 Introduction 28
9.2 Waste Mitigation Measures 28
9.3 Environmental Monitoring & Audit 30
10. health 31
10.1 Introduction 31
10.2 Monitoring
Requirements 31
11. SITE
ENVIRONMENTAL AUDIT 32
11.1 Site
Inspections 32
11.2 Compliance
with Legal and Contractual Requirements 33
11.3 Environmental
Complaints 33
12. REPORTING 35
12.1 General 35
12.2 Baseline
Monitoring Report 35
12.3 EM&A
Reports 36
12.4 Data
Keeping 41
12.5 Interim
Notifications of Environmental Quality Limit Exceedances 41
1. INTRODUCTION
1.1 Purpose of the Manual
1.2 Background
1.3 Site Location
1.4 Sensitive Receivers
1.5 Environmental Monitoring and Audit Requirements
1.6 Project Organisation
1.7 Construction Programme
2. AIR QUALITY
2.1 Introduction
2.2 Dust Mitigation Measures
2.3 Environmental Monitoring & Audit
3. NOISE
3.1 Introduction
3.2 Event and Action Plan for Noise
3.3 Noise Mitigation Measures
3.3.1 Good Site Practice
3.3.2 Selecting Quieter Plant and Working Methods
3.4 Environmental
Monitoring & Audit
4. WATER QUALITY
4.1 Introduction
4.2 Water Quality Parameters
4.3 Monitoring Equipment
4.3.1 Dissolved Oxygen and Temperature Measuring Equipment
4.3.2 Turbidity Measurement Instrument
4.3.3 Sample Containers and Storage
4.3.4 Calibration of In-Situ Instruments
4.3.5 Laboratory Measurement/Analysis
4.4 Monitoring Locations
4.5 Baseline Monitoring
4.6 Impact Monitoring
4.7 Event and Action Plan for Water Quality
4.8 Mitigation Measures 16
4.9 Environmental Monitoring & Audit 18
4.10 Groundwater Monitoring 18
5. FISHERIES 19
5.1 Introduction 19
5.2 Mitigation Measures 19
6. ECOLOGY 20
6.1 Introduction 20
6.2 Mitigation Measures 20
6.2.1 Terrestrial Ecology 20
6.2.2 Marine Ecology 20
6.3 Environmental Monitoring & Audit 21
7. CULTURAL HERITAGE 22
7.1 Introduction 22
7.2 Recommended Mitigation Measures 22
7.3 Environmental Monitoring & Audit 22
8. LANDSCAPE AND VISUAL IMPACTS 23
8.1 Introduction 23
8.2 Mitigation Measures 23
9. WASTE MANAGEMENT 25
9.1 Introduction 25
9.2 Waste Mitigation Measures 25
9.3 Environmental Monitoring & Audit 27
10. health 28
10.1 Introduction 28
10.2 Monitoring Requirements 28
11. SITE ENVIRONMENTAL AUDIT 29
11.1 Site Inspections 29
11.2 Compliance with Legal and Contractual
Requirements 30
11.3 Environmental Complaints 30
12. REPORTING 32
12.1 General 32
12.2 Baseline Monitoring Report 32
12.3 EM&A Reports 33
12.4 Data Keeping 38
12.5 Interim Notifications of Environmental Quality
Limit Exceedances 38
1. INTRODUCTION
1.1 Purpose of the Manual
1.2 Background
1.3 Site Location
1.4 Sensitive Receivers
1.5 Environmental Monitoring and Audit Requirements
1.6 Project Organisation
1.7 Construction Programme
2. AIR
QUALITY
2.1 Introduction
2.2 Dust Mitigation Measures
2.3 Environmental Monitoring & Audit 5565
3. NOISE 7686
3.1 Introduction 7686
3.2 Event and Action Plan for Noise 7686
3.3 Noise Mitigation Measures 98108
3.3.1 Good Site Practice 98108
3.3.2 Selecting Quieter Plant and Working Methods 98108
3.4 Environmental
Monitoring & Audit 109119
4. WATER
QUALITY 11101210
4.1 Introduction 11101210
4.2 Water Quality Parameters 11101210
4.3 Monitoring Equipment 11101210
4.3.1 Dissolved Oxygen and Temperature Measuring
Equipment 11101210
4.3.2 Turbidity Measurement Instrument 11101210
4.3.3 Sample Containers and Storage 11101210
4.3.4 Calibration of In-Situ Instruments 12111311
4.3.5 Laboratory Measurement/Analysis 12111311
4.4 Monitoring Locations 12111311
4.5 Baseline Monitoring 12111311
4.6 Impact Monitoring 13121412
4.7 Event and Action Plan for Water Quality 13121412
4.8 Mitigation Measures 17151915
4.9 Environmental Monitoring & Audit 19172117
5. FISHERIES 20182218
5.1 Introduction 20182218
5.2 Mitigation Measures 20182218
6. ECOLOGY 21192319
6.1 Introduction 21192319
6.2 Mitigation Measures 21192319
6.2.1 Terrestrial Ecology 21192319
6.2.2 Marine Ecology 21192319
6.3 Environmental Monitoring & Audit 22202420
7. CULTURAL
HERITAGE 23212621
7.1 Introduction 23212621
7.2 Recommended Mitigation Measures 23212621
7.3 Environmental Monitoring & Audit 23212621
8. LANDSCAPE
AND VISUAL IMPACTS 25222822
8.1 Introduction 25222822
8.2 Mitigation Measures 25222822
9. WASTE MANAGEMENT 27243024
9.1 Introduction 27243024
9.2 Waste Mitigation Measures 27243024
10. health 30273327
10.1 Introduction 30273327
10.2 Monitoring
Requirements 30273327
11. SITE
ENVIRONMENTAL AUDIT 31283428
11.1 Site
Inspections 31283428
11.2 Compliance
with Legal and Contractual Requirements 32293529
11.3 Environmental
Complaints 32293529
12. REPORTING 34313731
12.1 General 34313731
12.2 Baseline
Monitoring Report 34313731
12.3 EM&A
Reports 35323832
12.4 Data
Keeping 40374337
12.5 Interim
Notifications of Environmental Quality Limit Exceedances 40374337
112222234445666888910101010101010111111111212151717181818191919191920
212121212222222625262526252928292829283029302931303130333233323332343339383938
1. INTRODUCTION 1
1.1 Purpose
of the Manual 1
1.2 Background 2
1.5 Environmental
Monitoring and Audit Requirements 2
1.6 Project
Organisation 2
1.7 Construction
Programme 3
2. AIR
QUALITY 4
2.1 Introduction 4
3. NOISE 65
3.1 Introduction 65
3.2 Event
and Action Plan for Noise 65
3.3 Noise
Mitigation Measures 87
6. ECOLOGY 1914
7. CULTURAL
HERITAGE 2116
8. LANDSCAPE
AND VISUAL IMPACTS 2217
9.1 Introduction 2519
9.2 Waste
Mitigation Measures 2519
Table 9.1 Waste
Management Plan 2519
10. health 2822
11. SITE
ENVIRONMENTAL AUDIT 2923
11.1 Site
Inspections 2923
11.2 Compliance
with Legal and Contractual Requirements 3024
11.3 Environmental
Complaints 3024
12. REPORTING 3226
12.1 General 3226
12.2 Baseline
Monitoring Report 3226
12.3 EM&A
Reports 3327
12.4 Data
Keeping 3832
12.5 Interim
Notifications of Environmental Quality Limit Exceedances 3832
LIST OF TABLES
Table
3.1 Actions and Limit Levels
for Construction Noise
Table 3.2 Event/Actions Plan for Construction
Noise
Table
4.1 Water Sample Handling
Requirements
Table
4.2 Typical Action and Limit
Levels for Water Quality
Table
4.3 Event/Action Plan for Water
Quality
Table
9.1 Waste Management Plan
LIST OF FIGURES
Figure 1.1 Location Plan
Figure 1.2 Location of the identified air and
noise sensitive receivers
Figure 1.3 Project
Organisation and Lines of Communication
Figure 1.4 Outline Construction Programme
Figure 4.1 Locations of the Proposed Three
Water Quality Monitoring Points
Figure 9.1 Complaint Response Procedures
ANNEXES
Annex A Implementation Schedule
Annex B Implementation Status Proforma
Annex C Complaint Log
Annex D Environmental Monitoring Data
Recording Sheets
Annex
E Interim Notification of
Environmental Quality Limit Exceedances
The purpose of this
Environmental Monitoring and Audit (EM&A) Manual, hereafter referred to as
the Manual, is to guide the setup of an EM&A programme to ensure compliance
with the Environmental Impact Assessment (EIA) study recommendations, to assess
the effectiveness of the recommended mitigation measures and to identify any
further need for additional mitigation measures or remedial action. This Manual outlines the monitoring and audit
programme proposed for the installation of 3 x 132kV circuit from Pui O via Chi
Ma Wan peninsula via sea crossing towards Cheung Chau.
This Manual contains the
following:
a)
responsibilities
of the Contractor, the Engineer or Engineer's Representative (ER) Independent
Checker (Environmental) and Environmental Team (ET) with respect to the
environmental monitoring and audit requirements during the course of the
project;
b)
information
on project organisation and programming of construction activities for the
project;
c)
the
hypotheses of potential impacts, the basis for and description of the broad
approach underlying the environmental monitoring and audit programme;
d)
requirements
with respect to the construction schedule and the necessary environmental
monitoring and audit programme to track the varying environmental impacts;
e)
the
specific questions and testable hypotheses that the monitoring programme is
designed to answer;
f)
details
of the methodologies to be adopted, including all field, laboratory and analytical
procedures, and details on quality assurance and quality control programme;
g)
the
rationale on which the environmental monitoring data will be evaluated and
interpreted and the details of the
statistical procedures that will be used to interpret the data;
h)
definition
of Action and Limit levels (AL Levels);
i)
establishment
of Event and Action Plans;
j)
requirements
for reviewing pollution sources and working procedures required in the event of
non-compliance of the environmental criteria and complaints;
k)
requirements
for presentation of environmental monitoring and audit data and appropriate
reporting procedures; and
l)
requirements
for review of EIA predictions and effectiveness of the environmental monitoring
and audit programme.
For the purpose of this Manual,
the "Engineer" shall refer to the Engineer as defined in the Contract
and the Engineer's Representative (ER), in cases where the Engineer's powers
have been delegated to the ER, in accordance with the Contract. The ET leader, who shall be responsible for
and in charge of the ET, shall refer to the person delegated the role of
executing the environmental monitoring and audit requirements.
It shall be noted that this EM&A Manual is
subject to changes. The Manaul shall be reviewed and updated later, where
necessary, near the commencement of construction of the Project.
CLP Power Hong Kong Limited (CLP) proposes to
construct 3 x 132 kV transmission link from Pui O via Chi Ma Wan peninsula via
sea crossing towards Cheung Chau in order to maintain the integrity of the
network in transmission and distribution.
This project is a Designated Project under Schedule
2, Q.1, of the Environmental Impact Assessment Ordinance (EIAO) as part of the
proposed transmission line passes through Lantau South Country Park. Therefore,
CLP is required to undertake an Environmental Impact Assessment (EIA) Study to
provide information on the nature and extent of environmental impacts arising
from the construction and operation of the proposed designed project and
related activities taking place concurrently.
The proposed transmission link commences from the
existing Pui O Substation on South Lantau Island, via Chi Ma Wan Peninsula via
Adamasta Channel towards Cheung Chau North and Cheung Chau South as shown in Figure 1.1.
Sensitive receivers (SRs)
have been identified within the study area of the Project. These include Ham
Tin Tsuen, Pui O Lo Wai Tsuen, Cheung Kwai Estate, Greenery Crest, Buddhist Wai
Yan Memorial College, Adamasta Channel, Cheung Chau Typhoon Shelter, Cheung Sha
Wan Fish Culture Zone, Fish Fry Nursery Area, Tung Wan, Nam Tam Wan, Tai
Kai Wan, Po Yuen Wan, Pak Tso Wan, Tai Long Wan, Yi Long Wan, Yi Long Pai, Chi
Ma Wan Road Ham Tin Section, Pui O Wan Beach Camp Site, village houses near Tin
Hau Temple (Pui O Wan), detached houses (Pui O Wan), on Kai-to along Adamasta
Channel and Tai Long Wan. Location of the identified air and noise sensitive
receivers, as well as proposed three water quality monitoring points are shown
in Figures 1.2 and 4.1 respectively.
The EIA study identified the likely environmental impacts during construction and operational phases, including health, ecological and landscape/visual. These impacts can be minimised to acceptable levels with the implementation of environmental mitigation measures. In order to ensure the acceptability, monitoring and audit requirements for health, ecology and landscape/visual resource and character have been identified and are described in details in the subsequent sections.
The proposed project organisation is shown in Figure 1.3. The
responsibilities of respective parties are:The project
organisation and lines of communication with respect to environmental
protection works is shown in Figure 1.3.
The Contractor
·
provide assistance to ET in
carrying out monitoring
·
submit proposals on mitigation
measures in case of exceedances of Action and Limit
levels in accordance
with the Event and Action Plans
·
implement measures to reduce
impact where Action and Limit levels are exceeded
·
adhere to the procedures for
carrying out complaint investigation in accordance with 11.3.
The Engineer or Engineers Representative
·
supervise the Contractors
activities and ensure that the requirements in the EM&A Manual are fully
complied with
·
inform the Contractor when action
is required to reduce impacts in accordance with the Event and Action Plans
·
employ an IC(E) to audit the
results of the EM&A works carried out by the ET
·
adhere to the procedures for
carrying out complaint investigation in accordance with 11.3.
The Environmental Team
·
monitor the various environmental
parameters as required in the EM&A Manual
·
analyse the EM&A data and
review the success of EM&A programme to cost effectively confirm the
adequacy of mitigation measures implemented and the validity of the EIA predictions and to identify any
adverse environmental impacts arising
·
carried out site inspection to
investigate and audit the Contractor’s site practice, equipment and work
methodologies with respect to pollution control and environmental mitigation, and anticipate environmental
issues for proactive action before problems arise
·
audit and prepare audit repots on the environmental monitoring data and
the site environmental conditions
·
report on the EM&A results to
the IC(E), Contractor, the ER, and the EPD
·
recommended suitable mitigation
measures to the Contractor in the case of exceedance of action and Limit levels
in accordance with the Event and Action Plans
·
adhere to the procedures for
carrying out complaint investigation in accordance with 11.3
The
ET leader shall have relevant professional qualifications, or have sufficient
relevant EM&A experience subject to approval of the ER and the
Environmental Protection Department (EPD).
Independent Checker (Environment)
·
review the EM&A works
performed by the ET
·
audit the monitoring activities
and results
·
evaluate the EM&A reports
submitted by the ET
·
review the proposals for
mitigation measures submitted by the Contractor in accordance with the Event
and Action Plans
·
adhere to the procedures for
carrying out complaint investigation in accordance with 11.3
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. The ET shall not be in any way an associated body of the
Contractor.
The Environmental Team (ET) shall
not be in any way an associated body of the Contractor. The ET leader shall have relevant
professional qualifications, or have sufficient relevant EM&A experience
subject to approval of the Engineer's Representative (ER) and the Environmental
Protection Department (EPD).
Appropriate staff shall be
included in the ET, under the supervision of the ET Leader, to fulfil the
EM&A duties of the ET Leader specified in this manual. Basically, the duties comprise the
following:
a)To monitor the various
environmental parameters as required in EIA study final report;
b)To investigate and audit the
Contractors' equipment and work methodologies with respect to pollution control
and environmental mitigation, and anticipate environmental issues for proactive
action before problems arise;
c)To audit and prepare audit
reports on the environmental monitoring data and the site environmental
conditions; and
d)To report on the environmental
monitoring and audit results to the Contractor, the ER, and the EPD or its
delegate.
Appropriate resources shall also
be allocated under the Contractor and the ER to fulfil their duties specified
in this manual.
The Independent Checker
(Environmental), IC(E), shall be an independent person or company with a
minimum of 7 years EIA experience and proven track record in EM&A similar
to the scope proposed in this Manual.
A preliminary project
programme is shown in Figure 1.4.
The major construction
activities are manufacturing and delivery of material, underground cable laying
and circuit up-rating.
Installation of the proposed 3 x 132kV supply
transmission line, submarine cables, cable tunnel and the associated
underground cables are planned to commence in mid 2002 for completion by end
2004.
The installation of the 132kV circuit will not lead to cause an
adverse dust impacts. It is predicted that all ASRs would have
an acceptable dust level. In addition to the recommended mitigation measures
and good site practice, further dust suppression can be achieved. As a result,
no baseline dust monitoring and dust impact monitoring are recommended prior to
and during the construction works, respectively.
Specific
Dust
suppression efficiencyt of 50% can be achieved by applying watering twice
a day.
General
The
following control measures are stipulated in the Air Pollution Control
(Construction Dust) Regulation and should be implemented to minimise the dust
nuisance.
·
the stockpile
should be properly treated and sealed with latex, vinyl, bitumen or other
suitable surface stabiliser if a stockpile of dusty materials is more than 1.2m
but less than 2m high and lies within 50m from any site boundary that adjoins a
road, street, or other area accessible to the public;
·
effective dust
screens, sheeting or netting should be provided to enclose the scaffolding from
the ground floor level of the building or if a canopy is provided at the first
floor level, from the first floor level, up to the highest level of the
scaffolding where a scaffolding is erected around the perimeter of a building
under construction;
·
dump truck for
material transport should be totally enclosed by impervious sheeting;
·
any excavated
dusty materials or stockpile of dusty materials should be covered entirely by impervious
sheeting or sprayed with water so as to maintain the entire surface wet, and
recovered or backfilled or reinstated within 24 hours of the excavation or
unloading;
·
stockpile of
dusty materials should not extend beyond the pedestrian barriers, fencing or
traffic cones;
·
dusty materials
remaining after a stockpile is removed should be wetted with water and cleared
from the surface of roads;
·
vehicle washing
facilities should be provided at every vehicle exit point;
·
the area where
vehicle washing takes place and the section of the road between the washing
facilities and the exit point should be paved with concrete, bituminous
materials or hardcores;
·
where a site
boundary adjoins a road, streets or other area accessible to the public,
hoarding of not less than 2.4m high from ground level should be provided along
the entire length except for a site entrance or exit;
·
every main haul
road should be scaled with concrete and kept clear of dusty materials or
sprayed with water so as to maintain the entire road surface wet;
·
the portion of
road leading only to a construction site that is within 30m of a designated
vehicle entrance or exit should be kept clear of dusty materials;
·
every stock of
more than 20 bags of cement should be covered entirely by impervious sheeting
or placed in an area sheltered on the top and the 3 sides;
·
loading,
unloading, transfer, handing or storage of bulk cement or any cement during or
after the de-bagging process should be carried out in a totally enclosed system
or facility, and any vent or exhaust should be fitted with an effective fabric
or equivalent air pollution control system or equipment;
·
cement, or any
other dusty materials collected by fabric filters or other air pollution
control system or equipment should be disposed of in totally enclosed
containers;
·
stockpile of
dusty materials should be either covered entirely by impervious sheeting,
placed in an area sheltered on the top and the 3 sides; or sprayed with water
so as to maintain the entire surface wet;
·
all dusty
materials should be sprayed with water prior to any loading, unloading or
transfer operation so as to maintain the dusty material wet;
·
vehicle speed
should be limited to 10 kph except on completed access roads;
·
every vehicle
should be washed to remove any dusty materials from its body and wheels before
leaving the construction sites;
·
the load of
dusty materials carried by vehicle leaving a construction site should be
covered entirely by clean impervious sheeting to ensure that the dusty
materials do not leak from the vehicle;
·
the working
area of excavation should be sprayed with water immediately before, during and
immediately after the operations so as to maintain the entire surface wet;
Blasting of Works
·
the area within 30m from the blasting area shall be
wetted with water prior to blasting;
·
blasting shall not be carried out when the strong
wind signal or tropical cyclone warning signal No. 3 or higher is hoisted
unless prior permission of the Commissioner of Mines is obtained.
·
wire mesh, gunny sacks and sandbags should be used
on top of the blast area at each shot to prevent flying rock and dust;
·
water the surface of the blast area to increase its
moisture content;
·
dust filters should be fitted to the tunnel
construction ventilation systems;
·
vents of all silos and weighing scale shall be
fitted with fabric filtering system; and
·
seating of pressure relief valves of all silos
shall be checked, and the valves resealed if necessary, before each delivery.
the area
within 30m from the blasting area should be wetted with water prior to
blasting; and
·blasting
should not be carried out when the strong wind signal or tropical cyclone
warning signal No. 3 or higher is hoisted unless prior permission of the
Commissioner of Mines is obtained.
Construction dust impact on the ASRs from the
limited construction works would unlikely to be of a concern. Nevertheless,
practicable and cost-effective mitigation measures are outlined below to
minimise the dust nuisance.
Material
Handling
·The height from
which fill materials are dropped should be controlled to a minimum practical
height to limit fugitive dust generation from unloading;
·Any stockpiles
of aggregate or spoil should be covered and water applied;
·Water spray
should be used during the handling of excavated and fill material where dust is
likely to be created; and
·All dusty
materials should be sprayed with water immediately prior to any loading,
unloading or transfer operation so as to maintain moisture content of the dusty
materials.
Earthworks
·The amount of
exposed soil should be kept in minimal by re-vegetation of completed
earthworks.
The implementation schedule of control measures is presented in Annex A.
Full compliance with the AQOs during construction
will likely achieved at all air sensitive receivers with the implementation of
mitigation measures such as regular watering twice a day. Therefore, routine
dust monitoring during construction is not required but regular site audits are
recommended to be conducted to ensure the implementation of good site practice
and appropriate mitigation measures.Routine dust
monitoring during construction is not required but regular site audits (e.g. a
monthly basis) are recommended to be conducted to ensure the implementation of good
site practice and appropriate mitigation measures.
According to the findings of the EIA Report, noise
exceedances during construction phase are not expected with the implementation
of noise mitigation measures such as using quiet equipment, movable temporary
noise barriers and rescheduling of noisy activities. Routine noise monitoring
is not required during construction but regular site audits are recommended to
be conducted to ensure the effectiveness of these good site practices and
appropriate mitigation measures.
The AL Levels for
construction noise are defined in Table
3.1. Should non-compliance of the
criteria occurs, action in accordance with the Action Plan in Table 3.2, shall be carried out.
Table 3.1 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) |
|
0700-2300 hrs on
holidays; and 1900-2300 hrs on all other days |
60/65/70** dB(A) |
|
|
2300-0700 hrs of
next day |
45/50/55** dB(A) |
* Reduce to
70 dB(A) for schools and 65 dB(A) during school examination periods.
** To be selected based on Area Sensitivity Rating.
Table 3.2 Event/Action
Plan for Construction Noise
|
EVENT |
ACTION |
|
|
|
|
|
ET Leader |
IC(E) |
ER |
Contractor |
|
Action Level |
1. Notify IC(E) and Contractor 2. Carry out investigation 3. Report the results of investigation to the
IC(E) and Contractor 4. Discuss with the 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 for 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 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 |
The EIA Report has recommended construction noise
control and mitigation measures. The Contractor shall be responsible for the
design and implementation of these measures.
Noise generated from construction sites can be
minimised through good site practice and selecting quiet plant. These methods
are discussed in the following paragraphs.
Good site practice and noise management can
considerably reduce the impact of construction site activities on nearby
NSRs. The following package of measures
shall be followed during each phase of construction:
· only well-maintained plant
shall be operated on-site and plant shall be serviced regularly during the
construction works;
· machines and plant that may
be in intermittent use shall be shut down between work periods or shall be
throttled down to a minimum;
· plant known to emit noise
strongly in one direction, shall, where possible, be orientated to direct noise
away from nearby NSRs;
· mobile plant shall be sited
as far away from NSRs as possible; and
· material stockpiles and
other structures shall be effectively utilised, where practicable, to screen
noise from on-site construction activities.
The Contractor may be able
to obtain particular models of plant that are quieter than standard types given
in the GW-TM. Benefits which can be achieved through this
approach will depend on the details of the Contractor chosen methods of
working. As it is considered too
restrictive to define specific items of plant for the construction operations,
it is more practical to specify an overall plant noise performance
specification to apply to the total SWL of all plant on the site so that the
Contractor is allowed some flexibility to select plant to suit his needs The benefits achievable for each of the measures
proposed will depend on the details of the Contractors' chosen methods of
working, and it is considered too restrictive to specify items of plant that a
Contractor has to use during construction activities. It is therefore both preferable and practical to specify an
overall plant noise performance specification to apply to the total SWL of all
plant on the site, so that the Contractor is allowed some flexibility to select
plant to suit his needs.
The nature of the construction noise sources of the
project allows the introduction of a wide range of possible mitigation
measures. Commonly used noise
mitigation measures include:
·
Application
of properly designed silencers, mufflers, acoustically dampened panels and
acoustic sheds or shields, etc.;
·
Use
of electric-powered equipment where applicable instead of diesel-powered or
pneumatic-powered equipment;
·
Erecting
noise enclosures around noisy plants;
·
Location
of noise emitting plants at maximum possible distances from sensitive receivers;
·
Contractual
clauses for construction works;
·
Schedule
of noisy operations during non-restricted hours; and
·
Regular
maintenance of site plant/equipment.
·
A
temporary cantilevered barriers of 4m high is proposed to be erected at the
tunnel portal area in order to alleviate the construction noise impact by
blocking the line of view from the nearby receivers. The barrier material needs
to have a surface density (> 7 kg/m2) to provide sufficient
screening effect (approx. 10 dB(A)).
Mitigation Measures during
blasting of works (Specific)
Tunnel
portal doors should be closed when the construction activities carried out
within the tunnel.
If the above measures are not sufficient to restore
the construction noise quality to an acceptable levels upon the advice of ET
Leader, the Contractor shall liaise with the ET Leader on some other mitigation
measures, propose to ER for approval, and carry out the mitigation measures.
The implementation schedule of mitigation measures
is presented in Annex A.
Laying underground cables is a typical installation
and CLP has established good trade practices for this work such that they
minimise the construction noise and dust impacts. With the implementation of
noise mitigation measures and scheduling the construction activities in front
of the school, full compliance with the environmental criteria is expected to
be achieved. Therefore, routine environmental monitoring for construction noise
is not required during the construction phase. Regular site audits are however
recommended to be conducted to ensure the effectiveness of these good site
practices and appropriate mitigation measures
A
sSediment
plume modelling was
undertaken to determine the environmental acceptability of laying cables across the Adamasta
Channel. The model results indicated full compliance with the WQO’s at the
defined sensitive receivers for the direct burying method. For the option of
cable laying using dredging, mitigation measures need to be applied to ensure
compliance. As a result it is suggested that confirmatory monitoring of the
conclusions of the EIA is undertaken if direct burying is undertaken and
compliance monitoring if dredging is considered.the impacts on receiving water
quality under various likely scenarios during construction. Although no
exceedance of Water Quality Objective (WQO) of suspended solids is anticipated
at the monitoring locations, water quality monitoring is recommended for
submarine cable laying from Chi Ma Wan Peninsula via Adamasta Channel towards
Cheung Chau for the general protection of marine resources..
Monitoring for Dissolved
Oxygen (DO), temperature, turbidity, pH and suspended solids (SS), shall be
undertaken at designated monitoring stations. The purpose of which is to ensure that any
deterioration in water quality can be readily detected and timely action can be
taken to resolve any problems. It should be noted that DO, temperature,
turbidity and pH should be measured in-situ whereas SS assayed in laboratory.
In association with the
water quality parameters, other relevant data shall also be measured, such as
monitoring location/position, time, weather conditions, and any special
phenomena and description of work underway at the construction site etc.
The following equipment and facilities shall be
provided by the ET and used for the monitoring of water quality impacts:
(a) The instrument should
be portable and weatherproof using a DC power source. The equipment should be capable of measuring:
·
a DO level in the range of 0-20 mg/1 and 0-200%
saturation; and
·
a temperature of between 0-45 degree Celsius.
(b) It should have a
membrane electrode with automatic temperature compensation complete with a
cable.
The instrument should be portable and weatherproof
using a DC power source. It should have
a photoelectric sensor capable of measuring turbidity between 0-1000 NTU, such
as a Hach model 2100P or similar approved.
(a) Water samples for SS analysis should be stored in high
density polythene bottles with no preservative added, packed in ice (cooled to
4oC without being frozen), delivered to the laboratory, and analysed
as soon as possible after collection.
(b) Water samples for oil & grease
measurement should be stored in glass bottles, acidified to pH 2 or lower with
1:1 HCl, packed in ice (cooled to 4oC
without being frozen), and delivered to the laboratory as soon as possible
after collection.
All pH meters, DO meters and turbidimeters shall be
checked and calibrated prior to use. DO
meters and turbidimeters shall be calibrated by a laboratory accredited under
HOKLAS or any other international accreditation scheme, 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 calibrations for all DO
meters shall be carried out before measurement at each monitoring location. .
For the on site calibration of field equipment, BS 127:1993, "Guide to field and on-site test
methods for the analysis of
waters" should be observed.
Analysis shall be carried out in a HOKLAS or other international
accredited laboratory. If a site
laboratory is set up or a non-HOKLAS or 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 DEPEngineer.
Sample volume and maximum storage time for each analytical parameter carried out in the laboratory are shown below in Table 4.1
Table
4.1 Water Sample Handling
Requirements
|
Analytical Parameter |
Sample Volume Taken (ml) |
Storage Temperature |
Maximum Storage Time After Sampling |
|
SS |
500 |
4°C |
24
hours |
Each sample shall be analysed in accordance with the
APHA Standard Methods for the Examination of Water and Wastewater, 18th
edition, or an equivalent method approved by the EngineerDEP. If an in-house or non-standard method is
proposed, details of the method verification may require to be submitted to the
EngineerDEP. In any circumstance, the sample testing
shall comply with a comprehensive quality assurance and quality control
programme. The laboratory should be
prepared to demonstrate the quality programmes to the EngineerDEP when
requested.
The proposedd three
water quality monitoring points including Cheung Sha Wan Fish Culture Zone, Cheung Chau Typhoon Shelter, Tai, Kwai Wan, Tai Long Wan, South of Hei Ling Chau Typhoon Shelter, and Pui O Beach and Adamasta Channel, are illustrated in Figure 4.1. The locations and and number of the
monitoring points (and frequency of the confirmatory monitoring in the case of direct
burying) shall) shall be agreed
with EPD before undertaking any works. The status and locations of water
quality sensitive receivers may change after issuing this manual. If such cases
exist, the ET leader shall propose updated monitoring locations and seek
approval from the IC(E) and DEP.
When
alternative monitoring locations are proposed, they shall be chosen based on
the following criteria:
(a) at locations close to and preferably at the
boundary of the mixing zone of the major site activities as indicated in the
EIA final report, which are likely to have water quality impacts;
(b) close to the sensitive receptors which are
directly or likely to be affected;
(c) for monitoring locations located in the
vicinity of the sensitive receptors, care shall be taken to cause minimal
disturbance during monitoring;
(d) two or more control stations which shall be at
locations representative of the project site in its undisturbed condition. Control stations shall be located, as far as
is practicable, both upstream and down stream of the works area.
Control
stations are necessary to compare the water quality from potentially impacted
sites with the ambient water quality.
Control stations shall be located within the same body of water as the
impact monitoring stations but shall be outside the area of influence of the
works and, as far as practicable, not affected by any other works.
Measurements
shall be taken at 3 water depths, namely, 1m below water surface, mid-depth and
1m above sea bed, except where the water depth less than 6m, the mid-depth
station may be omitted. Should the
water depth be less than 3m, only the mid-depth station will be monitored. The ET Leader shall seek approval from the
IC(E) and DEP on all the monitoring stations.
Replicates in-situ measurements
and samples collected from each independent sampling event are required for all
parameters to ensure a robust statistically interpretable dataset.
Baseline conditions for the water quality of
Southern Waters shall be established and agreed with DEP prior to the
commencement of works. The purposes of the baseline monitoring are to establish
ambient conditions prior to the commencement of the marine works and to
demonstrate the suitability of the proposed impact, control and reference
monitoring points.
The baseline
conditions shall normally be established by measuring the water quality
parameters specified in Section 4.2. The measurements shall be taken at all
designated monitoring stations including control points, 3 days per week, at
mid-flood and mid-ebb tides, for at least four weeks prior to the commencement
of marine works.
There shall not be any construction activities over
water in the vicinity of the points during the baseline monitoring.
In exceptional case when insufficient baseline monitoring data or
questionable results are obtained, the ET Leader shall seek approval from the
IC(E) and DEP on an appropriate set of data to be used as baseline reference.
Baseline monitoring schedule shall be faxed to EPD 1 week prior to the
commencement of baseline monitoring. The interval between 2 sets of monitoring
shall not be less than 36 hours.
During the course of the
marine works, monitoring shall be undertaken three days per week, at mid-flood
and mid-ebb tides, with sampling at the designated monitoring points. The
interval between 2 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 will be increased.
Upon completion of all marine activities, a post project monitoring
exercise on Southern Waters water quality shall be carried out for four weeks
in the same manner as the impact monitoring.
Proposed water quality monitoring schedule shall be faxed to EPD on or
before the first day of the monitoring month, EPD shall be notified immediately
of any change in schedule by fax.
The water quality assessment
criteria, namely Action and Limit levels are based on the results of baseline
monitoring and WQO of the Southern Waters water control zone (Table 4.2). The
actions in accordance with the Action Plan in Table 4.3 shall be carried out if
the water quality assessment criteria are exceeded at any designated monitoring
points.
Table
4.2 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 4mg/l except 5mg/l
for FCZ or 1%-ile of baseline
data for surface and middle layer Bottom 2mg/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 (e.g. required suspended solids
levels for concerned sea water intakes) |
|
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 |
Notes:
- For DO, non-compliance of the water quality limits occurs
when monitoring result is lower than the limits.
-
For
SS and Tby, non-compliance of the water quality limits occurs when monitoring
result is higher than the limits.
-
All
the figures given in the table are used for reference only and the EPD may amend
the figures whenever it is considered as necessary.
Table
4.3 Event/Action
Plan for Water Quality
|
Event |
ET Leader |
IC(E) |
ER |
Contractor |
|
Action Level being exceeded
by one sampling day |
1. Repeat in-situ measurement
to confirm finding; 2. Identify source(s) of
impact; 3. Inform IC(E) and
Contractor; 4. Check monitoring data, all
plant, equipment and Contractor’s working methods; 5. Discuss mitigation measures
with IC(E) and Contractor; and 6. Repeat measurement on next day of
exceedance. |
1. Discuss with ET and
Contractor on the mitigation measures; 2. Review proposals on
mitigation measures submitted by Contractor and advise the ER accordingly;
and 3. 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; and 6. Implement the agreed
mitigation measures. |
|
Action Level being exceeded
by more than one consecutive sampling day |
1. Repeat in-situ measurement
to confirm finding; 2. Identify source(s) of
impact; 3. Inform IC(E) and
Contractor; 4. Check monitoring data, all
plant, equipment and Contractor’s working methods; 5. Discuss mitigation measures
with IC(E) and Contractor; 6. Ensure mitigation measures are implemented; 7. Prepare to increase the monitoring
frequency to daily; and 8. Repeat measurement on next day of
exceedance. |
1. Discuss with ET and
Contractor on the mitigation measures; 2. Review proposals on
mitigation measures submitted by Contractor and advise the ER accordingly;
and 3. Assess the effectiveness of
the implemented mitigation measures. |
1. Discuss with IC(E) on the
proposed mitigation measures; 2. Make agreement on the
mitigation measures to be implemented; and 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; 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; and 6. Implement the agreed
mitigation measures. |
|
Limit Level being exceeded
by one sampling day |
1. Repeat in-situ measurement
to confirm finding; 2. Identify source(s) of
impact; 3. Inform IC(E), Contractor
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. |
1. Discuss with ET and
Contractor on the mitigation measures; 2. Review proposals on
mitigation measures submitted by Contractor and advise the ER accordingly;
and 3. Assess the effectiveness of
the implemented mitigation measures. |
1. Discuss with IC(E), ET and
Contractor on the proposed mitigation measures; and 2. Request Contractor to
critically review the working methods; 3. Make agreement on the
mitigation measures to be implemented; and 4. 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; 4. Consider changes of working
methods; 5. Discuss with ET and IC(E)
and ER and propose mitigation measures to IC(E) and ER within 3 working days;
and 6. Implement the agreed
mitigation measures. |
|
Limit Level being exceeded
by more than one consecutive sampling day |
1. Repeat in-situ measurement
to confirm finding; 2. Identify source(s) of
impact; 3. Inform IC(E), Contractor
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. Discuss with ET and
Contractor on the mitigation measures; 2. Review proposals on
mitigation measures submitted by Contractor and advise the ER accordingly;
and 3. Assess the effectiveness of
the implemented mitigation measures. |
1. Discuss with IC(E), ET and
Contractor on the proposed mitigation measures; and 2. Request Contractor to
critically review the working methods; 3. Make agreement on the
mitigation measures to be implemented; 4. Assess the effectiveness of
the implemented mitigation measures; and 5. Consider and instruct, if
necessary, the Contractor to slow down or to stop all or part of the marine
work until no exceedance of Limit Level. |
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 ER and propose mitigation measures to IC(E) and ER within 3 working days;
6. Implement the agreed
mitigation measures; and 7. As directed by the
Engineer, to slow down or to stop all or part of the marine work or
construction activities. |
Direct Burying
Interpretation of the model results
indicates that no mitigation measures are required for direct burying
regardless of the tide and season. Full
compliance with the WQO’s at the sensitive receivers are predicted.
Dredging
It is recognised that although the
majority of the cables will be laid by direct burying, at either end minor
dredging works may be required as the shallow depth of water is unsuitable for
the direct burying machine to operate. Such minor dredging works would best be
carried out during the dry season with a single cable trench being dredged at
any given time to ensure compliance with the WQO’s.
In the event that dredging takes place during the
wet season then additional mitigation measures to be adopted include the use of
closed and sealed grabs. This will reduce the release of sediment by at least
50% and coupled with a controlled rate of lifting (can be up to 50% reduction
in suspended solids release) of the dredged material will be adequate to ensure
compliance with the WQO’s will be achieved at the sensitive receivers.
In the event that dredging three trenches
simultaneously is considered the use of closed and sealed grabs will be
adequate to achieve compliance with the WQO’s at the sensitive receivers during
the dry season. During the wet season the combined suite of mitigation measures
such as closed and sealed grabs, controlled lifting rate and a reduction in the
rate of dredging (by 40%) will be needed to reduce the release of suspended
solids to enable compliance with the WQO’s.
In Summary
Mitigation measures may also be required to
minimise the effects of construction on receiving water quality through the
control of surface runoff from sites, and the provision of appropriate
collection, treatment and disposal facilities for the wastes (liquid and solid)
which are generated during the implementation of the works.
It should also be noted that the extent of
mitigation measures will vary depending upon the nature of the contract. In
order to provide a cost effective package of mitigation measures which can be
included in the environmental requirements of each contract, a suite of general
measures have been proposed for the protection of receiving water quality.
Simulated worst
possible cases to allow effect of mitigation (if required) were assessed. The
water quality assessment has concluded that mitigation measures may be required
to minimise the effects of construction on receiving water quality. These
include the control of direct burying/dredging cable trenches, the control of
surface runoff from sites during construction and the provision of collection,
treatment and disposal facilities for the wastes (liquid and solid) which are
generated during the implementation of the works. It should also be noted that
the extent of mitigation measures will vary depending upon the nature of the
contract. In order to provide a cost effective package of mitigation measures
which can be included in the environmental requirements of each contract, a
suite of general measures have been proposed for the protection of receiving
water quality.
General
Mitigation Measures
The Contractor should be
responsible for the design and implementation of the following mitigation
measures.
·
All
waste water generated on the site shall be collected, removed from site via a
suitable and properly designed temporary drainage system and disposed of at a
location and in a manner that will cause neither pollution nor nuisance;
·
The
Contractor should construct, maintain, remove and reinstate, as necessary,
temporary drainage works and take all other precautions necessary for the
avoidance of damage by flooding and silt washed down from the works. HeThe Contractor should also provide
adequate precautions to ensure that no spoil or debris of any kind is allowed
to be pushed, washed down, fall or be deposited on land or on the seabed
adjacent to the site;
·
Around any material storage, batching plants or
other facilities where spillage may occur, a bund with a capacity of 110% will
be provided;
·
The
Contractor should not permit any sewage, waste water or other effluent
containing sand, cement, silt or any other suspended or dissolved material to
flow from the site onto any adjoining land or allow any solid waste to be
deposited anywhere within the site or onto any adjoining land and shall have
all such materials removed from the site;
·
The
Contractor should be responsible for temporary drainage, diverting or
conducting of open streams or drains intercepted by any works and for
reinstating these to their original courses on completion of the works;
·
Any
proposed temporary diversions to stream courses or nullahs shall be submitted
to the Engineer for agreement one month prior to such diversion works being
commenced. Diversions shall be constructed to allow the water flow to discharge
without overflow, erosion or washout. The area through which the temporary
diversion runs is to be reinstated to its original condition when the temporary
diversion is no longer required;
·
The
Contractor shall not discharge directly or indirectly (by runoff) or cause or
permit to be discharged into any public sewer, storm-water drain, channel,
stream-course or sea, any effluent or foul or contaminated water or cooling
water without the prior consent of the relevant Authority who may require the
Contractor to provide, operate and maintain at the Contractor’s own expense,
within the premises or otherwise, suitable works for the treatment and disposal
of such effluent or foul or contaminated or cooling or hot water;
·
If any office, site canteen or toilet facilities is
erected, foul water effluent shall, subject to clause as stated in the last
paragraph above, be directed to a foul sewer or to a sewage treatment
facilities either directly or indirectly by means of pumping;
·
The
Contractor shall at all times ensure that all existing stream courses and
drains within, and adjacent to the site are kept safe and free from any debris
and any excavated materials arising from the works. The Contractor shall ensure
that chemicals and concrete agitator washings are not deposited in
watercourses; and
·
All
Contractor’s equipment shall be designed and maintained to minimise the risk of
silt and other contaminants being released into the water column or deposited
in other than designated locations.
General Pollution
Prevention Measures to be Adopted During Dredging
·
use of closed and sealed grabs to
be used to reduce sediment release rate by at least 50%;
·
mechanical grabs shall be
designed and maintained to avoid spillage and shall seal tightly while being lifted;
all vessels shall be sized such that adequate clearance is maintained between
vessels and the sea bed at all states of the tide to ensure that undue
turbidity is not generated by turbulence from vessel movement or propeller
wash;
·
dredging rate must be lower than
547m3/day during dry season
·
dredging rate must be lower than
328m3/day during wet season (if three trenches dredged
simultaneously);
mechanical
grabs shall be designed and maintained to avoid spillage and shall seal tightly
while being lifted; all vessels shall be sized such that adequate clearance is
maintained between vessels and the sea bed at all states of the tide to ensure
that undue turbidity is not generated by turbulence from vessel movement or
propeller wash. Dredging rate should not exceed 547 m3/day
·
dredging should
preferably be carried out during the dry season;
·
the marine
works shall cause no visible foam, oil, grease, scum, litter or other
objectionable matter to be present on the water within the Site or dumping
grounds;
·
all barges
shall be fitted with tight fitting seals to their bottom openings to prevent
leakage of material;
·
excess material
shall be cleaned from the decks and exposed fittings of barges before the
vessel is moved
·
loading of
barges and hoppers shall be controlled to prevent splashing of dredged material
to the surrounding water and barges or hoppers shall not be filled to a level
which will cause overflowing of material or polluted water during loading or
transportation;
·
the Engineer
may monitor any or all vessels transporting material to ensure that no dumping
outside the approved location takes place.
The Contractor shall provide all reasonable assistance to the Engineer
for this purpose;
·
all vessels
used for marine works must be currently registered as such with the marine
department; and
·
water quality
monitoring shall be carried out by the Contractor during the dredging. Requirements and extent of monitoring will
be agreed with DEP and the Engineer.
In addition to
the foregoing general protection measures the following control measures for
dredging may also apply when exceedances of SS levels at the monitoring
locations are identified:
·use of closed
and sealed grabs to reduce release rate by at least 50%;
·if programme
permits schedule dredging works during dry season;
·control release
of suspended sediments to achieve 50% reduction; and
·dredging one
trench at a time.
·
e Specifically: the following control measures for
dredging may also apply in the event that dredging is proposed:
·
dredging works should be scheduled
to take place during the dry season wherever possible; and
·
dredging rate should be lower
than 328 m3/day
during wet season.
General
Pollution Prevention Measures to be Applied During Direct Burying
·
other than exerting
due care when carrying out the works, direct burying can be carried out without
any special mitigation measures being required to protect sensitive receivers
regardless of the tide or season.
·rates of
burying can be carried out at up to 400m/day without any adverse impact being
detected at water sensitive receivers.
·between
completing one direct burying activity and commencing the next a rest period of
6 hours should be observed to allow the sediment levels to reduce to pre-works
levels.
·in the event
that direct burying techniques generate suspended solids levels greater than
30% above ambient (to be defined in the baseline survey but taken as 3.9 mg/L
for the purposes of this assessment) consideration may need to be given to
working within a shield over the face of the direct burying machine.
General
Pollution Prevention Measures to be Applied During Placing of Cables in Cheung
Chau Typhoon Shelter
·
use of silt
screens may be required, either side of the cable laying if the placing of
cables causes elevation in suspended solids in excess of 30% above the ambient
level as defined through the baseline water quality monitoring data. For the
purposes of this assessment this is assumed to be 3.9 mg/L.
General
Water Pollution Prevention Measures to be Applied if TBM’s Used
·
all wastewater generated
must be treated to the appropriate standard given in the TM on “Standards for
Effluents Discharged into Drainage and Sewerage Systems, Inland and Coastal
Waters”.
·
in the event
that conventional sedimentation techniques are inadequate to treat wastewater
generated, consideration should be given to use of alternative techniques such
as mobile microfiltration plants.
General Pollution
Prevention Measures to be Adopted if Drill and Blast Method is Adopted
·
all wastewater
generated must be treated to the appropriate standard given in the TM on
“Standards for effluents Discharged into Drainage and Sewerage Systems, Inland
and Coastal Waters”.
·
in
the event that conventional sedimentation techniques are inadequate to treat
wastewater generated, consideration should be given to use of alternative
techniques such as mobile microfiltration plants.
.
The implementation schedule
of mitigation measures is present in Annex
A.
To
confirm compliance with the WQO’s it is proposed that an environmental
monitoring and audit programme is established. This will focus on confirmatory
monitoring for the direct burying option, and compliance monitoring in the
event dredging is proposed.
Water
quality monitoring should include locations at Cheung Sha Wan Fish Culture
Zone, Cheung Chau Typhoon Shelter, Tai Kwai Wan, Tai Long Wan, South of Hei
Ling Chau Typhoon Shelter and, Pui O Beach and Adamasta Channel. The locations and number of the monitoring points shall be agreed
with EPD before undertaking any works. Details of the water quality monitoring
and their monitoring locations are presented in the section 4 of Environmental
Monitoring and Audit Manual.
With the
implementation of the water quality mitigation measures, no exceedance of WQO
of suspended solids is anticipated at the monitoring locations. However, a
robust environmental monitoring and audit will be implemented to ensure that
the general mitigation measures are effective and the actual water quality
impacts during the installation of submarine cables and the temporary working platform at Pui O Beach
are acceptable.
Site investigations have been conducted to identify
the ground condition in Chi Ma Wan Peninsula along the proposed cable
alignment. The investigation revealed that the proposed tunnelling will have
negligible effect on the water catchment and is unlikely to cause any significant
drawndown of the groundwater profile and as a result it does not affect
existing plantation within the study area. However, as a preventive measure,
monitoring points are proposed at appropriate locations to monitor any change
of the ground water profile during the construction period.
The purpose of the groundwater monitoring is to:-
· monitor the existing ground water table, in case of
any substantial change or abnormal loss of groundwater, mitigation measures
could be implemented at the first instance; and
· implement mitigation measures wherever appropriate
to prevent further groundwater inflow into the proposed cable tunnel and to
alleviate the drawdown effect which although unlikely has the potential to
affect the existing plantation.
The proposed tunnel is located approximately 120m
below the ground surface in Chi Ma Wan Peninsula. The estimated catchment
affected by the proposed tunnel will be approximately 390,000m2
based on a 400m zones of influence as described in McFeat et al, 1998. The
water inflow into the proposed cable tunnel will depend on the amount of rock
joints, types of joint infill and aperture thickness. Major water inflows occur
where fracture zones and open joints are encountered. It is recommended that
groundwater monitoring points are installed at shallow cover locations such as
in Lung Mei and where fracture zones and open joints are anticipated.
In case any substantial and abnormal changes in the
ground water table are observed from the monitoring point as a result of
groundwater inflow into the proposed cable tunnel, mitigation measures as
outlined below are recommended to prevent further groundwater loss. The mitigation measures include:-
· traditional pre-injection systems using cement
grout will be applied in the identified fault intersection zone to reduce the water
inflow, if necessary; and
· apply 2mm thick typical high performance PVC
waterproof membrane and geotextile fleece mats as suggested in the tunnel
preliminary design report to ensure watertighteness of the tunnel.
In order to ensure no ground water loss during the
cable tunnelling work, monitoring of ground water table and the monitoring requirements as
defined below will be specified in the Contract Document. The monitoring
requirements during construction period include:-
· The contractor is required to submit a layout plan
showing the proposed locations groundwater monitoring points to the
satisfaction of EPD; and
· The contractor is required to submit method
statements for the proposed mitigation measures to prevent further ground water
inflow into the proposed cable tunnel to the satisfaction of EPD, the
mitigation measures are:-
(i)
pre-injection system using
approved cement grout and any equivalent approved methods and/or proprietary
products which could achieve the same performance and purpose; and
(ii)
lining and waterproof membrane
for the cable tunnel.
Groundwater
levels will be monitored wherever groundwater maintenance is required during
construction, for operational or environmental reasons in accordance with the
requirements in Geoguide 4, Guide to Cavern Engineering. This shall be done
with piezometer installations along the cable tunnel alignments, particularly
at shallow cover locations such as in Lung Mei and critical location such as
the Shap Long Reservoir. Monitoring frequency and the number and location of
monitoring points will be established for different ground conditions subject
to the agreement of GEO and EPD.
Mitigation
Measures
According to the Assessment Report on “The Effect of the Proposed CLP Chi Ma Wan
Cable Tunnel on Shap Long Reservoir”, January 2001, Atkins China Ltd., the recommended mitigation measures are adopted as
follows:
·traditional pre-injection systems using bentonite
cement grout will be specified in the potential fault intersection zone to
reduce the water inflow if necessary; and
·typical 2mm thick high performance pvc waterproof
membrane and geotextile fleece mat will be proposed in the preliminary design
stage to ensure watertighteness of the tunnel.
An assessment of potential
impacts to fisheries associated with the construction and operation of 3 x
132kV supply circuit from Pui O via Chi Ma Wan Peninsula via sea crossing
towards Cheung Chau has been carried out. The direct impact lead to minor temporary habitat loss is likely to be
negligible due to a small scale of reclamation
worksworking platform at
Pui O Wan which will be reinstated once
excavation of the cable tunnel is complete. The indirect impacts during
construction include an increase in suspended sediment concentrations and
decrease in dissolved oxygen in the water column are anticipated to be
localized and transient.
TThe
Contractors should take all necessary steps to avoid impacts to water quality
during the ccable laying in order to prevent any
potential impacts to fisheries resources and fishing ooperations. It is considered that the
protection measures recommended in Section 4.6 to ccontrol impacts to water quality to
within acceptable levels, are also expect to control impacts tto fisheries resources and fish
culture operations. Impacts on fishing operations can be rreduced by confining the construction
area in the radius of 50m from the laying barge and bburying machine from Marine Department.
Thus, no specific mitigation measures for ffisheries
resources are required during construction of the cable.
The monitoring and audit
activities, designed to detect and mitigate any unacceptable impacts on water
quality and marine ecology, will also serve to protect against unacceptable
impacts on fisheries resources. The
EM&A programme will provide management actions and supplemental mitigation
measures to be employed should impacts arise, thereby ensuring the
environmental acceptability of the project.
As insignificant impacts to the fishery are expected to occur, the
development and implementation of a monitoring and audit programme specifically
designed to assess the effects on commercial fisheries resources is not
necessary.
The proposed 132 kV circuits
will mainly be located on existing road/footpaths. The impacts due to the construction and operation of the
underground cable are considered to be low, and no adverse residual impact is
expected. The most sensitive issue is
the direct habitat loss (0.12 ha of tall shrubland) within the South Lantau
Country Park, in which no unacceptable residual impact will be expected. Mitigation measures in the form of good
construction practice and scrub compensatory planting are recommended to
minimise potential disturbance to the surrounding environment.
Constraints on controlling
impacts to water quality to within acceptable levels during construction are
expected to also control impacts on marine ecology. No unacceptable impacts are expected to occur during the
operation phase of the Project. Hence,
monitoring and auditing of marine ecological resources during the construction
and operation of the Project is deemed not necessary.
The following mitigation measures to minimise disturbance due to the
project are recommended below.
·
Prevent
stream sedimentation during construction, particularly tunnel construction, by
erection of sediment barriers and operation of stilling ponds in streams which
could be potentially affected.
·
Erect
fences along the boundary of construction sites before the commencement of
works to prevent tipping, vehicle movements, and encroachment of personnel into
adjacent areas, particularly streams S1 to S4, forest beside the Pui O portal,
Pui O Marsh and Pui O Taro Bed.
·
Regularly
check the work site boundaries to ensure that they are not exceeded and that no
damage occurs to surrounding areas.
·
Treat
any damage that may occur to individual major trees in the adjacent area with
surgery.
·
Reinstate
temporary work sites/disturbed areas immediately after completion of the
construction by on-site tree/shrub planting.
Tree/shrub species used should take reference from those in the
surrounding area.
·
Prohibit
and prevent open fires within the site boundary during construction and provide
temporary fire fighting equipment in the work areas, particularly close to
forest areas.
Construction Phase
The marine ecological
assessment indicates that during construction works the potential impacts to
marine ecological assemblages are environmentally acceptable and no marine
ecology specific mitigation measures are required. Constraints on controlling impacts to water quality to within
acceptable levels during construction are expected to also control impacts to
marine ecology. In accordance with the
guidelines in the EIA-TM on marine ecology impact assessment the
general policy for mitigating impacts to marine ecological resources, in order
of priority, are:
·
Avoidance: Potential impacts should be
avoided to the maximum extent practicable by adopting suitable alternatives;
·
Minimisation: Unavoidable impacts should be
minimised by taking appropriate and practicable measures such as constraints on
intensity of works operations or timing of works operations; and
·
Compensation: The loss of important species
and habitats may be provided for elsewhere as compensation. Enhancement and other conservation measures
should always be considered whenever possible.
The previous discussion has
indicated that the following habitats within the Study Area will be lost:
·
Low
Ecological Value - 0.01855 ha of intertidal sandy shore
at Pui O as a result of reclamationprovision of temporary working platform, but this will
be resinstated
following completion of the excavation
of the tunnel;
·
Low
Ecological Value - 0.5 ha of subtidal soft bottom benthos as a result of submarine providing the concrete indication layer over the
cable. This will be re-established by
natural sedimentation over time; cable laying.
·
Medium
Ecological Value - small narrow areas of rocky shores as a result of cable
landing works.
The habitats to be permanently lost due to the
construction activities associated with the proposed Project are small in area
and of low or medium ecological value.
Given that constraints on controlling impacts to water quality to within
acceptable levels during construction can control impacts on marine ecology, no
mitigation measures for marine ecological resources are required. It is
expected that over time rocky shore organisms will colonise the concrete
covered cable trough and similar communities will be re-established.
Operation Phase
Impacts to marine ecological
resources during operation of the electric cable circuit are not predicted to
occur. Hence no marine ecology specific
mitigation measures are required during Project operation.
The
implementation schedule of mitigation measures is presented in Annex A.
Terrestrial Ecology
The implementation of the terrestrial ecological mitigation measures
stated in Section 6.3.5 of EIA report should be
checked regularly (e.g. on a monthly basis) as part of the environmental
monitoring and audit procedures during the construction period.
Marine Ecology
Mitigation
measures to control impacts to water
quality to within acceptable levels during construction are expected to also
control impacts on marine ecology. No
unacceptable impacts are expected to occur during the operation phase of the
Project. Hence, monitoring and auditing
of marine ecological resources during the construction and operation of the
Project is deemed not necessary.
The
implementation schedule of mitigation measures is presented in Annex A.
Literature reviews of
existing information supplemented with the results of field surveys on cultural
heritage resources indicate that 31 historical buildings and features and two
known archaeological sites are located within the Study Area. The proposed development has tried to avoid
the heritage sites as far as possible but concerns have been raised regarding
the potential impact on some of the identified sites.
The objective of the study
is presented as follows:
To identify any negative
impacts on site of cultural heritage and to propose measures to mitigate these
impacts.
Mitigation measures have
been recommended to avoid impacts to cultural heritage resources; control of
the construction work schedule during peak visiting hour at Pui O Tin Hau
Temple.
The indirect air and noise
impact on Pui O Tin Hau Temple will require consultation with villagers to
identify peak visiting periods to the temple, such as festival days, to avoid
construction works to be undertaken at those times. The relevant air and noise assessment at the Tin Hau Temple area
is presented in relevant sections of this report.
IIn order to avoid
reaching the core area of the sandbar at Pui O Public School area (Site A), it
is rrecommended
to keep the circuit alignment as east as possible at the margin of the sandbar
near the junction between South Lantau Road and Chi Ma Wan Road to minimise the
direct impact. It is also recommended
that the trench to be dug out to lay the cable should follow the existing road
and does not penetrate into the ‘no-dig’ zone as defined by AMO to avoid
reaching the original ground surface which may contain the cultural remains
from the lime kilns.
WWith regard to the
direct impact on the inner raised beach at Pui O (Site B), it is rrecommended that
the detail design of the underground cable construction should not allow any
disturbance of the Tang dynasty layer (4.38 - 4.9 mPD), which is 1.5 m from
existing ground level (6.2 - 6.9 mPD) within this section.
TThe future levels of the proposed Chi
Ma Wan Road widening implemented by Highways ddepartment need to be carefully
designed to allow for the minimum 1000 mm cover for the ccables, which
shall be laid above the Tang dynasty layer or the `no dig’ zone as defined by AAMO. If the cover requirement cannot be achieved,
approval from Highway Department sshould be sought in advance for
allowing the cables to be laid in a shallow depth with additional protection
such as concrete surround to protect the cables.
The
implementation schedule of mitigation measures is presented in Annex A.
The recommended mitigation measure of avoiding the
cultural layer in sites A and B is expected to prevent damage to the existing
archaeological deposits. However, as a
precautionary measure arising from the possibility that the level of the
cultural layer may vary from point-to-point it is recommended that
archaeological monitoring is undertaken in the sections within the Pui O Archaeological
Site during construction to preserve the archaeological deposit, if any, by
record and take environmental samples for future study if necessary. The construction contractor should cooperate
with a qualified archaeologist appointed to undertake the monitoring to allow
sufficient time for recording archaeological deposit and take environmental
samples if necessary.
The level of significance of
the landscape and visual impacts of the project has been classified in
accordance with Annex 10 of the
EIA-TM. Based on the criteria in Annex 10, the landscape and visual
impacts are considered acceptable for the following reasons:
·
the change to the baseline condition will be negligible
except Section 2, 4 & 5 of the EIA report;
·
in some locations, Cheung Chau Sai Tai Road (Section 5
of the EIA report), the proposed alignment can be sited so as to avoid
disturbances to the existing tree along the promenade.
·
Landscape
and visual impacts are considered to be significance during construction only
in Section 1 and 6, significant impacts persist in Section 2, 4 & 5 of the
EIA report where permanent structures will be built. However all potentially high landscape impacts can be reduced or
offset to a large extent by landscape mitigation measures as indicated in
Tables 8-5 and 8-6 of the EIA report.
The alignment of
the circuit is significantly constrained by the technical engineering requirements. However, the nature of the proposed works
means that most of alignment can be constructed with minimal disturbance to the
existing landscape owing the limited working boundary along existing roads,
footpaths. In conclusion therefore, the
proposed works will have limited adverse impacts or negligible impacts on
baseline condition with appropriate mitigation measures.
A number of on-site landscape mitigation measures are recommended for incorporation into the Project. The mitigation measures are summarised in the following paragraphs. No off-site mitigation measures have been proposed.
Landscape Mitigation Measure
1 (LMM1) - Construction Programming and Works Areas
The construction programme
for the Project should be reduced to the shortest possible period and should be
executed in phases, particularly in those locations where severe or high
landscape and visual impacts are expected such as Pui O tunnel portal. Additionally, the extent and periphery of
the works areas should be managed so that they are as small as possible and do
not appear cluttered, untidy and unattractive, particularly to pedestrians and
people undertaking recreation activities in the Country Parks, beach and Cheung
Chau Promenade. Measures should be
implemented during construction to prevent soil erosion, such as temporary
drainage around excavations, covering of topsoil stockpiles with impermeable
material and sandbagging diversions around exposed soil. Temporary hoarding
barriers should be of a recessive visual appearance in both colour and form.
Measures should be implemented during construction to store materials in areas
with the least obstruction to residents, pedestrians and traffic and cover all
material stockpiles with impermeable material and sandbagging diversions around
exposed soil. The temporary reclaimed working
platform area
at the Puui O portal is required for stockpiles
from construction of the tunnel portal.
Topsoil will aalso
be stockpiled and used in the restatement of the disturbed coastline after
construction. AAnd
those stockpiles should not be more than 2m high.
Landscape Mitigation Measure
2 (LMM2) – Advanced Transplantation and Planting Works
Where possible, the
transplantation of existing valuable trees affected by the proposed works and
new compensatory planting works; should be carried out as early as possible in
the construction period instead of at the end.
This will allow the maximum time for maintenance, resulting in a higher
success rate for the survival of transplanted trees and the early establishment
of new screen trees and compensatory planting.
The protected orchid species, Aphyllorchis montana which was found in
the area of the Pui O Tunnel Portal (Section2a) should be temporarily moved to
a new location on site and carefully monitored and maintained. Following completion of the construction
works they should be reinstated in a condition and suitable location as near as
possible to the original habitat.
The protected orchid species,
Aphyllorchis montana which was found in the proposed Pui O Tunnel Portal
(Section2a) is proposed to be transplanted.
IIn compensation for the disturbance, a
planting reinstatement scheme will be implemented. It wwill comprise replanting 750m2 of
the Pui O tunnel portal area and 700 m2 of the Tai Long WWan landfall area with similar tree
species to those found in the existing environs, on a mminimum 1 to 1 basis, a matrix of
nursery stock seedlings and transplants are proposed at a rrate of 1/m2. A 12-month
maintenance (i.e. defects liability) period will also be needed to eensure transplantation in successful.
Landscape Mitigation Measure
3 (LMM3) – Colour Finishes of Ancillary Elements
TThe design of the tunnel portal, and
landfall areas should incorporate materials, details and textures so as to be
as visually recessive as possible and in a style that fits with the surrounding
rural setting. Colour should be of low chromatic intensity to reduce the
potential contrast between the structures and their background. External
finishing of the tunnel portal and landfall area will be designed in
conjunction with the landscape scheme.
Considering these two elements in tandem will integrate and improve the
visual mitigation of the overall proposed works. Where possible the use of
visually permeable security fencing is recommended. This type of fencing will
help to reduce the level of visual impact of the portal building by maximising
the ground width available for planting. Grass-Crete planter incorporated onto
the roof of the portal.
LLandscape Mitigation Measure 4 (LMM4)
– Reinstatement of Planting and Shoreline
TThe works areas at both Pui O and Tai
Long Wan Tunnel portals should be restored to their pprevious condition, including the
re-creation of natural and rocky shoreline, footpath and re-eestablishment of disturbed vegetation.
Topsoil dredged out during construction of the tunnel wwill be used in restatement of the
disturbed coastline. Where mature trees are felled that are cconsidered high in environmental
amenity, a replacement semi-mature tree should be planted. EExisting trees cleared by construction
activity should be replaced so that there is a net gain in ttree numbers after the project is
completed.
The implementation schedule
of mitigation measures is presented in Annex
A.
The Contractor is responsible for waste control within the construction
site, removal of waste material produced by the site and the implementation of
any mitigation measures to minimise waste or redress problems arising from site
waste. The waste material may include
site clearance waste, excavated materials, construction and demolition
(C&D) waste, chemical waste and general refuse.
The proposed re-use, recycling, storage, collection, transport and
disposal methods for various wastes which are recommended to avoid or minimise
potential adverse impacts are detailed below.
Specifically, it is recommended that during the construction phase, the
Contractor incorporate the recommendations into an on-site waste management
plan.
The Contractor shall also pay attention to the Waste Disposal Ordinance
and its subsidiary regulations, the Public Health and Municipal Services
Ordinance and the Water Pollution Control Ordinance, and carry out the
appropriate waste management work. The
relevant license/permit, such as the effluent discharge license, the chemical
waste producer registration, etc. shall be obtained. The Contractor shall refer to the relevant booklets issued by EPD
when applying for the license/permit.
During the site inspections and the document review procedures, the ET
Leader shall pay special attention to the issues relating to waste management,
and check whether the Contractor has followed the relevant contract
specifications and the procedures specified under the laws of Hong Kong.
A summary of the proposed mitigation measures and proposed disposal options are presented in Table 9.1 and form the Waste Management Plan for the proposed project works.
Table 9.1 Waste Management Plan
|
|
Control
Measures |
Proposed Disposal Method /
Area |
|
General Requirements |
Detailed
Design Stage ·
maximising
the opportunity for re-use of excavated materials for example, forming the
temporary working platform ·
Provide
treatments for converting unsuitable excavated materials for use in other
purpose e.g. upgrading of subsoil to topsoil by mixing with compost; ·
providing
an area within the construction site to allow for sorting and segregation of
materials. |
- |
|
|
C ·
minimisation
of waste generation for disposal (via reduction/recycling/re-use); ·
segregating
waste materials according to type to facilitate re-use and recycling; ·
separation
of inert construction and demolition materials for either re-use on-site or
use as public fill; |
|
|
|
·
·
co-ordinate
material deliveries to site in order to minimise storage times on site and
the likelihood of causing damage; ·
training
site staff in waste minimisation practices; ·
transport
of wastes off site as soon as possible; ·
maint ·
use of
re-useable metal hoardings / signboards; ·
no on-site
burning will be permitted; ·
follow the
practice set out in WBTC No.5/99 “Trip-ticket System for Disposal of
construction and Demolition Material”. |
|
|
Cleared vegetation from site clearance |
·
segregation ·
segregation
of excavated topsoil from roots and re-use for the landscaping works to
minimise the volume of waste requiring off-site disposal. |
Re-use / landfill |
|
Demolition waste |
·
segregation
of ma ·
appropriate
stockpile management; ·
follow the
practice set out in WBTC No.5/98 “On site Sorting of Construction Waste on
Demolition Sites”. |
Public fill for inert wastes |
|
Excavated materials |
·
segregation
of materials to facilitate disposal / reuse; ·
appropriate
stockpile management; ·
re-use of
excavated material on or off site (where possible); ·
special
handling and disposal procedures in the event that contam ·
follow the
practice set out in WBTC No.5/99 “Trip-ticket System for Disposal of
construction and Demolition Material”. |
Re-use on site for suitable material. Disposal to public fill areas for
unsuitable materials. |
|
Construction waste |
·
segregation
of materials to facilitate recycling/reuse (within designated area and in
appropriate containers/stockpiles); ·
appropriate
stockpile management; ·
planning
and design considerations to reduce over ordering and waste generation; ·
recycling
and re- ·
for
material which cannot be re-used/recycled, collection should be carried out
by an approved waste contractor for landfill disposal; ·
follow the
practice set out in WBTC No.5/98 “On site Sorting of Construction Waste on
Demolition Sites”. |
Public fill for inert wastes. Disposal to landfill for materials
unsuitable for public filling |
|
Chemical waste |
·
storage
within locked, covered and bunded area; ·
the storage
area should not be located adjacent
to sensitive receivers e.g. drains; ·
minimise
waste production and recycle oils/solvents where possible ·
a spill
response procedure should be in place and absorption material available for
minor spillages; ·
use
appropriate and labelled containers; ·
educate
site workers on site cleanliness/waste management procedures; ·
if chemical
wastes are to be generated, the contractor must register with EPD as a
chemical waste producer; ·
collection
by a licensed chemical waste collector. |
CWTC or SENT |
|
Municipal waste |
·
waste
should ·
regular,
daily collections are required by an approved waste collector; ·
provide
sanitary facilities. |
- |
|
Operational waste |
·
wastes
should be stored within a designated storage area; ·
waste such
as material wrapping should be segregated into recyclable, non recyclable and
putrescible w |
Dependent upon material type – refer to the waste
categories above. |
The implementation schedule
of mitigation measures is presented in Annex
A.
It has been recommended that auditing of each waste
stream should be carried out periodically by the contractor to determine if
wastes are being managed in accordance with approved procedures and the site
waste management plan. The audits
should look at all aspects of waste management including waste generation,
storage, recycling, treatment, transport, and disposal. An appropriate audit programme would be to
undertake a first audit at the commencement of the construction works, and then
to audit quarterly thereafter.
The predicted values of EMFs for the proposed underground cable would
be well under the stipulated guideline limits (below 1/5 of guideline limits)
issued by the ICNIRP. As such, the
existence of EMF associated with the proposed project is not anticipated to pose
any adverse impact on public health.
The measurement of similar design circuits
and predictions of EMF for the proposed uunderground cables, cables
in tunnel and submarine cables demonstrated that the predicted values would be
well under the stipulated guideline limits issued by ICNIRP. In order to verify
compliance with the ICNIRP guideline levels, field measurements will be carried
out within six months after commissioning of this circuit.
Site Inspections provide a direct means to trigger
and enforce the specified environmental protection and pollution control
measures. They shall be undertaken
routinely by the ET Leader to inspect the construction activities in order to
ensure that appropriate environmental protection and pollution control
mitigation measures are properly implemented.
With well defined pollution control and mitigation specifications and a
well established site inspection, deficiency and action reporting system, the
site inspection is one of the most effective tools to enforce the environmental
protection requirements on the construction site.
The ET Leader is responsible for formulation of the
environmental site inspection, deficiency and action reporting system, and for
carrying out the site inspection works.
He shall submit a proposal on the site inspection, deficiency and action
reporting procedures within 21 days of the construction contract commencement to
the Contractor for agreement and to the ER for approval.
Regular site inspections shall be carried out twice
per month. The areas of inspection
shall not be limited to the pollution control and mitigation measures within
the site; it shall also review the environmental situation outside the site
area which is likely to be affected, directly or indirectly, by the site
activities. A copy of Implementation
Status Proforma is shown in Annex B. The ET Leader shall make reference to the
following information in conducting the inspection:
a)
the
EIA recommendations on environmental protection and pollution control
mitigation measures;
b)
works
progress and programme;
c)
individual
works methodology proposals (which shall include proposal on associated
pollution control measures);
d)
the
contract specifications on environmental protection;
e)
the
relevant environmental protection and pollution control laws; and
f)
previous
site inspection results.
The Contractor shall update the ET Leader with all
relevant information of the construction contract for him to carry out the site
inspections. The inspection results and
its associated recommendations on improvements to the environmental protection
and pollution control works shall be submitted to the IC(E) and the Contractor within
24 hours, for reference and for taking immediate action. The Contractor shall follow the procedures
and time-frame as stipulated in the environmental site inspection, deficiency
and action reporting system formulated by the ET Leader to report on any
remedial measures subsequent to the site inspections.
Ad hoc site inspections shall also be carried out if significant
environmental problems are identified.
Inspections may also be required subsequent to receipt of an
environmental complaint, or as part of the investigation work, as specified in
the Action Plan for environmental monitoring and audit.
There are contractual environmental protection and
pollution control requirements as well as environmental protection and
pollution control laws in Hong Kong which the construction activities shall
comply with.
In order that the works are in compliance with the
contractual requirements, all the works method statements submitted by the
Contractor to the ER for approval shall also be sent to the ET Leader for
vetting to see whether sufficient environmental protection and pollution
control measures have been included.
The ET Leader shall also review the progress and
programme of the works to check that relevant environmental laws have not been
violated, and that any foreseeable potential for violating the laws can be
prevented.
The Contractor shall regularly copy relevant
documents to the ET Leader so that the checking work can be carried out. The document shall at least include the updated
Work Progress Reports, the updated Works Programme, the application letters for
different license/permits under the environmental protection laws, and all the
valid license/permit. The site diary
shall also be available for the ET Leader's inspection upon his request.
After reviewing the document, the ET Leader shall
advise the ER and the Contractor of any non-compliance with the contractual and
legislative requirements on environmental protection and pollution control for
them to take follow-up actions. If the
ET Leader's review concludes that the current status on license/permit
application and any environmental protection and pollution control preparation
works may not cope with the works programme or may result in potential
violation of environmental protection and pollution control requirements by the
works in due course, he shall advise the Contractor and the ER accordingly.
Upon receipt of the advice, the Contractor shall
undertake immediate action to remedy the situation. The ER shall follow up to ensure that appropriate action has been
taken by the Contractor in order that the environmental protection and
pollution control requirements are fulfilled.
Complaints shall be referred to the ET Leader for
carrying out complaint investigation procedures. The ET Leader shall undertake the following procedures upon
receipt of complaint:
a)
log
complaint and date of receipt onto the complaint database and inform the IC(E)
immediately;
b)
investigate
the complaint to determine its validity, and to assess whether the source of
the problem is due to works activities;
c)
if
a complaint is valid and due to works, identify mitigation measures;
d)
if
mitigation measures are required, advise the Contractor accordingly;
e)
review
the Contractor's response on the identified mitigation measures, and the
updated situation;
f)
if
the complaint is transferred from EPD, submit interim report to EPD on status
of the complaint investigation and follow-up action within the time frame
assigned by EPD;
g)
undertake
additional monitoring and audit to verify the situation if necessary, and
review that any valid reason for complaint does not recur;
h)
report
the investigation results and the subsequent actions to the source of complaint
for responding to complainant (If the source of complaint is EPD, the results
shall be reported within the time frame assigned by EPD); and
i)
record
the complaint, investigation, the subsequent actions and the results in the
monthly EM&A reports.
During the complaint investigation work, the
Contractor and ER shall cooperate with the ET Leader in providing all the
necessary information and assistance for completion of the investigation. If mitigation measures are identified in the
investigation, the Contractor shall promptly carry out the mitigation. The ER shall ensure that the measures have
been carried out by the Contractor. A
copy of compliant log is shown in Annex C.
A flow chart of the complaint response procedures is
shown in Figure 9.1.
The reporting guidelines referred to in this section
are based upon a paper based system, however, the same information can be
provided by an electronic medium upon agreeing the format with the ER and
EPD. All the monitoring data (baseline
and impact) shall also be submitted in diskettes in a format shown in Annex D.
The
ET Leader shall prepare and submit a Baseline Environmental Monitoring Report
within 10 working days of completion of the baseline monitoring. Copies of the Baseline Environmental
Monitoring Report shall be submitted to all parties; the Contractor, the IC(E),
the ER and the EPD. The format and
content of the report, and the representation of the baseline monitoring data
shall be in a format to the satisfaction of EPD and include, but not be limited
to the following:
a)
up
to half a page executive summary;
b)
brief
project background information;
c)
drawings
showing locations of the baseline monitoring stations;
d)
monitoring
results (in both hard and diskette copies) together with the following
information:
· monitoring methodology;
· name of laboratory and types
of equipment used and calibration details;
· parameters monitored;
· monitoring locations (and
depth);
· monitoring date, time,
frequency and duration;
· QA/QC results and detection
limits;
e) details on influencing
factors, including
· major activities, if any,
being carried out on the site during the period;
· weather conditions during
the period;
· other factors which might
affect the results.
f) determination of the AL Levels for each
monitoring parameter and statistical analysis of the baseline data; the
analysis shall conclude if there is any significant difference between control
and impact stations for the parameters monitored, and the following information
shall be recorded:
· graphical plots of monitored
parameters in the month annotated against;
· the major activities being
carried out on site during the period;
g) revisions for inclusion in the EM&A Manual; and
h) comments and conclusions.
The results and findings of
all EM&A work required in the Manual shall be recorded in the monthly
EM&A reports prepared by the ET Leader.
The EM&A report shall be prepared, endorsed by IC(E) and submitted
within 10 working days of the end of each reporting month, with the first
report due in the month after construction commences. Before submission of the first EM&A report, the ET Leader
shall liaise with the parties on the exact number of copies and format of the
monthly reports in both hard copy and electronic medium requirement. The ET Leader shall review the number and
location of monitoring stations and parameters to monitor every 6 months or on
as needed basis in order to cater for the changes in surrounding environment
and nature of works in progress.
First Monthly EM&A
Report
The First Monthly EM&A
Report shall include at least the following :
(a) 1-2 pages executive summary;
· Breaches of AL levels;
· Complaints Log;
· Notifications of any summons
and successful prosecutions;
· Reporting Changes;
· Future key issues.
(b) Basic Project Information
· Project organisations
including key personnel contact names and telephone numbers;
· Programme
· Management structure; and
· Works undertaken during the
month;
(c) Environmental Status
· Work undertaken during the
month with illustrations (such as location of works daily dredging/filling
rates percentage fines in the fill material used);and
· Drawing showing the project
area, any environmental sensitive receivers and the locations of the monitoring
and control stations.
(d) Summary of EM&A requirements
· All monitoring parameters;
· AL Levels;
· Event-Action Plans;
· Environmental mitigation
measures, as recommended in the project EIA Report;
· Environmental requirements
in contract documents;
(e) Implementation Status
Advice on the implementation
status of environmental protection and pollution control/mitigation measures,
as recommended in the project EIA Report, summarised in the updated
implementation schedule (in Annex A);
(f) Monitoring Results
To provide monitoring
results (in both hard and diskette copies) together with the following
information:
· Monitoring methodology
· Name of laboratory and types
of equipment used and calibration details
· Parameters monitored
· Monitoring locations (and
depth)
· Monitoring date, time,
frequency, and duration;
· Weather conditions during
the period; and
· Any other factors which
might affect the monitoring results;
· QA/QC results and detection
limits
(g)
Report on Non-compliance, Complaints, Notifications of Summons and Successful
Prosecutions
· Record of all noncompliance
(exceedances) of the environmental quality performance limits (AL Levels);
· Record of all complaints
received (written or verbal) for each media, including locations and nature of
complaints investigation, liaison and consultation undertaken, actions and
follow-up procedures taken, results and summary;
· Record of all notifications
of summons and successful prosecutions for breaches of the current
environmental protection/pollution control legislations, including locations
and nature of the breaches, investigation, follow-up actions taken, results and
summary;
· Review of the reasons for
and the implications of non-compliance, complaints, summons and prosecutions
including review of pollution sources and working procedures; and
· Description of the actions
taken in the event of noncompliance and deficiency reporting and any follow-up
procedures related to earlier noncompliance;
(h) Others
· An account of the future key
issues as reviewed from the works programme and work method statements; and
· Advice on the solid and
liquid waste management status.
Subsequent Monthly EM&A
Reports
The subsequent Monthly
EM&A Reports shall include the following :
(a) Executive Summary (1-2 pages)
· Breaches of AL levels
· Complaint Log
· Notifications of any summons
and successful prosecutions;
· Future key issues
(b) Environmental Status
· Works undertaken during the
month with illustrations including key personnel contact names and telephone
number; and
· Drawing showing the project
area, any environmental sensitive receivers and the locations of the monitoring
and control stations
(c) Implementation Status
Advice on the implementation
status of environmental protection and pollution control/mitigation measures
including measures for ecological, landscape and visual impacts, as recommended
in the EIA Report, summarised in the updated implementation schedule (see Annex A).
(d) Monitoring Results
To provide monitoring
results (in both hard and diskette copies) together with the following
information:
· Monitoring methodology
· Name of laboratory and types
of equipment used and calibration details
· Parameters monitored
· Monitoring locations (and
depth);
· Monitoring date, time,
frequency, and duration;
· Weather conditions during
the period; and
· Any other factors which
might affect the monitoring results;
· QA/QC results and detection
limits
(e) Report on Non-compliance, Complaints, Notifications of Summons
and Successful Prosecutions
· Record of all noncompliance
(exceedances) of the environmental quality performance limits (AL Levels);
· Record of all complaints
received (written or verbal) for each media, including locations and nature of
complaints investigation, liaison and consultation undertaken, actions and
follow-up procedures taken, results and summary;
· Record of all notifications
of summons and successful prosecutions for breaches of the current
environmental protection/pollution control legislations, including locations
and nature of the breaches, investigation, follow-up actions taken, results and
summary;
· Review of the reasons for
and the implications of non-compliance, complaints, summons and prosecutions
including review of pollution sources and working procedures; and
· a description of the actions
taken in the event of noncompliance and deficiency reporting and any follow-up
procedures related to earlier noncompliance;
(f) Others
· An account of the future key
issues as reviewed from the works programme and work method statements; and
· Advice on the solid and
liquid waste management status.
(g) Appendix
· AL levels
· Graphical plots of trends of
monitored parameters at key stations over the past four reporting periods for
representative monitoring stations annotated against the following:
i) major activities being carried out on site
during the period;
ii) weather conditions during the period; and
iii) any other factors which might affect the
monitoring results
· Monitoring schedule for the
present and next reporting period
· Cumulative statistics on
complaints, notifications of summons and successful prosecutions
· Outstanding issues and
deficiencies
Quarterly EM&A Summary
Reports
The Quarterly EM&A
Summary Report which shall generally be around 5 pages (including about 3 of
text and tables and 2 of figures) shall contain at least the following
information.
a)
up
to half a page executive summary;
b)
basic
project information including a synopsis of the project organisation,
programme, contacts of key management, and a synopsis of work undertaken during
the quarter;
c)
a
brief summary of EM&A requirements including:
·
monitoring
parameters;
·
environmental
quality performance limits (AL Levels); and
·
environmental
mitigation measures, as recommended in the EIA Report;
d) advice on the implementation status of
environmental protection and pollution control/mitigation measures, as recommended
in the project EIA study report, summarised in the updated implementation
schedule;
e) drawings showing the project area, any
environmental sensitive receivers and the locations of the monitoring and
control stations;
f) graphical plots of the trends of monitored
parameters over the past 4 months (the last month of the previous quarter and
the present quarter) for representative monitoring stations annotated against;
·
the
major activities being carried out on site during the period;
·
weather
conditions during the period; and
·
any
other factors which might affect the monitoring results;
g) advice on the solid and liquid waste
management status;
h) a summary of noncompliance (exceedances) of the environmental
quality performance limits (AL Levels);
i) an quarterly assessment of constructional impacts on water
quality at the project site including but not limited to comparison of the
difference between the quarterly mean and 1.3 times of the ambientment which is
defined as 30% increase of the baseline data or EPD data of the related
parameters by using appropriate statistical procedures. Suggestion of appropriate mitigation
measures if the quarterly assessment analytical results demonstrate that the
quarterly mean is significantly higher than the liaison water quality times of
the ambient mean (p < 0.05);
j) a brief review of the reasons for and the implications of
non-compliance including review of pollution sources and working procedures;
k) a summary description of the actions taken in the event of
non-compliance and any follow-up procedures related to earlier non-compliance;
l) a summary record of all complaints received (written or verbal)
for each media, liaison and consultation undertaken, actions and follow-up
procedures taken;
m) comments (e.g. effectiveness and efficiency of the mitigation
measures), recommendations (e.g. any improvement in the EM&A programme) and
conclusions for the quarter; and
n) proponents' contacts and any hotline telephone number for the
public to make enquiries.
Annual/Final EM&A Review
Reports
The Annual/Final EM&A
Report shall contain at least the following information:
a) Executive Summary (1-2 pages);
b) drawings showing the project area, any environmental sensitive
receivers and the locations of the monitoring and control stations:
c) basic project information including a synopsis of the project
organization contacts of key management, and a synopsis of work undertaken
during the course of the project or past twelve months;
d) a brief summary of EM&A requirements including:
(i) environmental mitigation measures, as recommended in the
project EIA Report;
(ii) environmental impact hypotheses tested;
(iii) AL Levels;
(iv) all monitoring parameters
(v) Event-Action Plans;
e) a summary of the implementation status of environmental
protection and pollution control/mitigation measures as recommended in the
project EIA study report summarized in the updated implementation schedule;
f) graphical plots and the statistical analysis of the trends of
monitored parameters over the course of the project, including the post project
monitoring (for the past twelve months for annual report) for all monitoring
stations against:
· the major activities being
carried out on site during the period;
· weather conditions during
the period; and
· any other factors which
might affect the monitoring results
g) a summary of noncompliance (exceedances) of the environmental
quality performance limits (AL Levels);
h) a review of the reasons for and the
implications of non-compliance including review of pollution sources and
working procedures as appropriate;
i) a description of the actions taken in the event of
non-compliance;
j) a summary record of all complaints received (written or verbal)
for each media liaison and consultation undertaken, action and follow-up
procedures taken;
k) a summary record of notifications of summons and successful
prosecutions for breaches of the current environmental protection pollution
control legislations locations and nature of the breaches, investigation, follow-up
actions taken and results;
l) a review of the validity of EIA Report predictions and
identification of shortcomings in EIA Report recommendations; and
m) a
review of the effectiveness and efficiency of the mitigation measures;
n) a review of success of the EM&A programme to cost effectively
identify deterioration and to initiate prompt effective mitigatory action when
necessary.
The site document such as the monitoring field records, laboratory
analysis records, site inspection forms, etc. are not required to be included
in the monthly EM&A reports for submission. However, the document shall be well kept by the ET Leader and be
ready for inspection upon request. All
relevant information shall be clearly and systematically recorded in the
document. The monitoring data shall
also be recorded in magnetic media form, and the software copy can be available
upon request. The water quality data
software format shall be agreed with EPD.
All the documents and data shall be kept for at
least one year after completion of the construction contract.
With reference to Event/Action Plans in Table 3.2, when the environmental quality limits are exceeded, the ET
Leader shall immediately notify the ER and EPD, as appropriate. The notification shall be followed up with
advice to EPD on the results of the investigation, proposed action and success
of the action taken, with any necessary follow-up proposals. A sample template for the interim
notifications is shown in Annex E.