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

 


1.            INTRODUCTION

 

1.1            Purpose of the Manual

 

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.

 

1.2  Review of the EM&A Manaul

1.2       Review of the EM&A Manual

 

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.

 

1.3            Background

 

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.

 

1.43       Site Location

 

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.

 

 

1.54            Sensitive Receivers

 

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.

 

1.65            Environmental Monitoring and Audit Requirements

 

            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.

 

1.76       Project Organisation

 

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. 

 

1.87            Construction Programme

 

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.

 

2.         AIR QUALITY

 

2.1            Introduction

 

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.

 

2.2       Dust Mitigation Measures

 

The construction works at the Pui O tunnel portal if nowithout any mitigation measures are in place, are likely to cause dust impact on the nearby ASRs. However, the construction dust impact can be reduced to an acceptable level with the implementation of dust control measures. Both general and specific mitigation measures are recommended to ensure no adverse air quality impact during construction phase.

 

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.

 

2.3            Environmental Monitoring & Audit

 

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.

 

3.         NOISE

 

3.1            Introduction

 

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.

 

3.2       Event and Action Plan for Noise

 

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

 



3.3       Noise Mitigation Measures

 

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.

 

3.3.1    Good Site Practice

 

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.

 

3.3.2            Selecting Quieter Plant and Working Methods

 

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.

 

3.4            Environmental Monitoring & Audit

 

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

 

4.            WATER QUALITY

 

4.1            Introduction

 

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..

 

4.2       Water Quality Parameters

 

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.

 

4.3            Monitoring Equipment

 

The following equipment and facilities shall be provided by the ET and used for the monitoring of water quality impacts:

 

4.3.1            Dissolved Oxygen and Temperature Measuring Equipment

 

(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.

 

4.3.2            Turbidity Measurement Instrument

 

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.

 

4.3.3    Sample Containers and Storage

 

(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.

 


4.3.4            Calibration of In-Situ Instruments

 

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.

 

4.3.5            Laboratory Measurement/Analysis

 

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.

 

4.4            Monitoring Locations

 

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.

           

4.5            Baseline Monitoring

 

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.

 

4.6       Impact Monitoring

 

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.

 

4.7       Event and Action Plan for Water Quality

 

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.

 


4.8            Mitigation Measures

 

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.

 

4.9            Environmental Monitoring & Audit

 

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.

 


4.10            Groundwater Monitoring

 

4.10.1  Impact on Loss of Groundwater

 

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.

 

 

4.10.2            Mitigation Measures

 

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.

 

4.10.3            Environmental Monitoring & Audit

 

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.

 

 


5.            FISHERIES

 

5.1            Introduction

 

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.

 

5.2            Mitigation Measures

 

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.

 


6.            ECOLOGY

 

6.1            Introduction

 

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.

 

6.2            Mitigation Measures

 

6.2.1            Terrestrial Ecology

 

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.

 

6.2.2    Marine Ecology

 

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.

 

6.3            Environmental Monitoring & Audit

 

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.


7.            CULTURAL HERITAGE

 

7.1            Introduction

 

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.

 

7.2            Recommended Mitigation Measures

 

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.

 

7.3            Environmental Monitoring & Audit

 

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 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 implementation schedule of mitigation measures is presented in Annex A.


8.            LANDSCAPE AND VISUAL IMPACTS

 

 

8.1            Introduction

 

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.

 

8.2            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.


 


9.            WASTE MANAGEMENT

 

9.1            Introduction

 

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.

 

9.2       Waste Mitigation Measures

 

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 platformreclamation;

·         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.

 

-

 

CConstruction Stage

·         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;

 

 

 

·         dduring demolition works, segregating materials at source as far as practical;

·         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;

·         maintain enance  aof comprehensive accurate waste records;

·         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

·         segregationion  of materials to facilitate disposal;

·         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 maaterials to facilitate disposal;

·         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 contamminated materials are excavated;

·         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--use of materials where possible (e.g. metal, wood from hoardings, formwork);

·         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 possiblee;

·         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  be stored within a temporary refuse collection facility, in appropriate containers prior to collection and disposal;

·         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 wwastes, where possible to facilitate disposal.

 

Dependent upon material type – refer to the waste categories above.

 

The implementation schedule of mitigation measures is presented in Annex A.

 

9.3            Environmental Monitoring & Audit

 

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.

 


10.            health

 

10.1            Introduction

 

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.

 

10.2            Monitoring Requirements

 

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.

 


11.       SITE ENVIRONMENTAL AUDIT

 

11.1     Site Inspections

 

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.

 


11.2            Compliance with Legal and Contractual Requirements

 

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.

 

11.3            Environmental Complaints

 

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.

 


12.            REPORTING

 

12.1            General

 

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.

 

12.2            Baseline Monitoring Report

 

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.


12.3     EM&A Reports

 

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.

 

12.4     Data Keeping

 

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.

 

12.5     Interim Notifications of Environmental Quality Limit Exceedances

 

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.