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