Environmental Monitoring &Audit Manual

 

Proposed Development at

 

Fung Lok Wai, Yuen Long

 

Lot 1457 R. P. in D.D. 123

 

 

 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


CH2M HILL Hong Kong Limited

in association with

 

RPS

ADI Ltd.

Archaeological Assessments

MVA Hong Kong Limited

 

 

 

Reference         R225-2.07

 

Client               Mutual Luck Investment Limited

 

Date                July 2008

 

 

 

 

 

 

 

 

 

 

 
 

 

 

 

 

 

 

 

 

 

 

 


TABLE OF CONTENTS

1.           Introduction_ 1-1

1.1     Background_ 1-1

1.2     Objectives of this EM&A Programme 1-1

1.3     Content of this EM&A Manual 1-2

2.           Project Description_ 2-2

2.1     The Subject Site and its Environs 2-2

2.2     Implementation Schedule of the Project 2-2

2.3     Environmental Monitoring and Audit Requirements 2-3

3.           Project Organisation_ 3-4

4.           Construction dust monitoring_ 4-1

4.1     Air Quality Parameters 4-1

4.2     Monitoring Equipment 4-1

4.3     Laboratory Measurement / Analysis 4-2

4.4     Proposed Monitoring Locations 4-2

4.5     Baseline Monitoring_ 4-3

4.6     Impact Monitoring_ 4-4

4.7     Event and Action Plan for Air Quality 4-4

4.8     Dust Mitigation Measures 4-6

5.           Construction NOISE Monitoring_ 5-7

5.1     Noise Parameters 5-7

5.2     Monitoring Equipment 5-7

5.3     Monitoring Locations 5-7

5.4     Baseline Monitoring_ 5-8

5.5     Impact Monitoring_ 5-8

5.6     Event and Action Plan for Construction Noise 5-9

5.7     Noise Mitigation Measures 5-10

6.           Water Quality MOnitoring_ 6-1

6.1     Introduction_ 6-1

6.2     Water Quality Parameters 6-1

6.3     Monitoring Equipment 6-1

6.4     Laboratory Measurement / Analysis 6-3

6.5     Proposed Monitoring Locations 6-3

6.6     Baseline Monitoring_ 6-4

6.7     Impact Monitoring_ 6-5

6.8     Event and Action Plan for Water Quality 6-5

6.9     Control/ Mitigation Measures Addressing Water Quality Impact 6-7

7.           Construction Waste Management_ 7-11

7.1     Introduction_ 7-11

7.2     Mitigation Measures 7-11

8.           Landscape and Visual_ 8-1

8.1     Introduction_ 8-1

8.2     Mitigation Measures 8-1

8.3     Design Phase Audit 8-3

8.4     Baseline Monitoring_ 8-4

8.5     Construction and Operational Phase Audit 8-4

9.           ECOLOGICAL MITIGATION_ 9-1

9.1     General Requirements 9-1

9.2     Ecological Monitoring_ 9-2

9.3     Reporting_ 9-11

9.4     Event and action plan for ecological attributes 9-11

10.          Cultural heritage_ 9-1

11.          SITE ENVIRONMENTAL AUDIT_ 9-1

11.1       Site Surveillance 9-1

11.2       Compliance with Legal and Contractual Requirements 9-2

11.3       Environmental Complaints 9-2

11.4       Documentation_ 9-3

12.          REPORTING_ 9-4

12.1       General 9-4

12.2       Baseline Monitoring Report 9-4

12.3       Monthly EM&A Reports 9-5

12.4       First Monthly EM&A Report 9-5

12.5       Subsequent Monthly EM&A Reports 9-7

12.6       Quarterly EM&A Summary Reports 9-8

12.7       Final EM&A Summary Reports 9-9

12.8       Forms to be Adopted_ 9-10

12.9       Data Keeping_ 9-10

12.10     Interim Notifications of Environmental Quality Limit Exceedances 9-11

 

APPENDICES

APPENDIX IA                       Implementation Schedule of Recommended Environmental Mitigation Measures

APPENDIX IB                       Implementation Schedule of Recommended Landscape and Visual Mitigation Measures

APPENDIX II                         Record of Forms

APPENDIX III                        A Typical Construction Phase Environmental Monitoring & Audit Procedure


LIST OF FIGURES

Figure 1‑1      The Site Boundary and the Proposed Access Road of the Project Error! Bookmark not defined.

Figure 2‑1      Tentative Construction Programme for the Project 2-4

Figure 2‑2      Indicative Boundary of Various Site Portions 2-4

Figure 4‑1      Air Quality Monitoring Field Record Sheet 4-7

Figure 4‑2      Location of the Proposed Air Quality Monitoring Stations 4-7

Figure 5‑1      Noise Monitoring Field Record Sheet 5-11

Figure 5‑2      Locations of the Proposed Noise Monitoring Stations 5-11

Figure 6‑1      Water Quality Monitoring Field Record Sheet 6-11

Figure 6‑2      Locations of the Water Quality Monitoring Stations 6-11

Figure 11‑1     Preliminary Site Inspection, Deficiency and Action Reporting System.. 9-4

Figure 11‑2     Complaint - Response Procedures 9-4

Figure 12‑1     Sample Template for Interim Notifications of Environmental Quality Limits Exceedances 9-12

 

 

LIST OF TABLES

Table 4‑1        Locations of Air Quality Monitoring Stations 4-3

Table 4‑2        Action and Limit Levels for Air Quality. 4-4

Table 4‑3        Event/Action Plan for Air Quality. 4-5

Table 5‑1        Locations of Construction Noise Monitoring Stations 5-7

Table 5‑2        Action and Limit Levels for Construction Noise. 5-9

Table 5‑3        Event and Action Plan for Construction Noise Monitoring. 5-9

Table 5‑4        Quiet/ Silenced Equipment Inventory. 5-10

Table 6‑1        Water Quality Parameters 6-1

Table 6‑2        Locations of Water Quality Monitoring Stations 6-3

Table 6‑3        Typical Action and Limit Levels for Water Quality. 6-5

Table 6‑4        Event and Action Plan for Water Quality Monitoring. 6-6

Table 8‑1        Proposed Construction Stage Mitigation Measures 8-1

Table 8‑2        Proposed Operational Stage Mitigation Measures 8-2

Table 8‑3        Event / Action Plan for Design Phase. 8-3

Table 8‑4        Construction / Operational Phase Audit Checklist 8-5

Table 8‑5        Responsibilities of Parties in the Event of Non-compliance. 8-6

Table 9‑1        Mitigation targets for key wetland bird species of conservation importance within remaining wetland areas of the Study Site required to fully compensate for habitat loss and disturbance impacts during construction. 9-3

Table 9‑2        Mitigation Targets for Enhanced Aquaculture Pond Species (other than birds) 9-4

Table 9‑3        Ecological monitoring programme for Fung Lok Wai WNR (Construction Phase) 9-4

Table 9‑4        Mitigation Targets for Enhanced Aquaculture Ponds 9-7

Table 9‑5        Mitigation targets for key wetland bird species of conservation importance within enhanced aquaculture ponds during the operational phase. 9-7

Table 9‑6        Mitigation Targets for Enhanced Aquaculture Pond Species (other than birds) 9-8

Table 9‑7        Mitigation Targets for Marsh Habitat 9-8

Table 9‑8        Bird Species Expected to use the Marsh Habitat 9-8

Table 9‑9        Ecological monitoring programme for Fung Lok Wai WNR (Operation Phase) 9-9

Table 9‑10       Key Action Levels and Limits and their associated management actions 9-12

 

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1.                  Introduction

1.1       Background

1.1.1            A residential development and a Wetland Nature Reserve (“WNR”) (hereinafter collectively called the “Project”) is proposed to be developed at existing fishponds at Lot 1457 R.P., D.D. 123 Fung Lok Wai, (the Subject site). The Project comprises the following main components: -

·        approximately 4.0 ha of residential land for 148,000m2 GFA residential development and a club house for residents;

·        approximately 76.1 ha of enhanced and managed WNR, comprising enhanced fish ponds, marsh complex and alternative egretry;

1.1.2            According to Item P of Part I, Schedule 2 of the Environmental Impact Assessment (EIA) Ordinance, the Project is classified as a Designated Project. Error! Reference source not found. shows the site boundary and the proposed access road.

1.1.3            As part of the Environmental Impact Assessment (EIA) study for the Project, a Manual for guiding the setup of an Environmental Monitoring and Audit (EM&A) programme to check the implementation of the relevant environmental mitigation measures recommended in the EIA is required.  The EM&A programme will be useful in providing a means to verify the effectiveness and adequacy of the mitigation measures recommended in the EIA such that additional mitigation measures or remedial action, if deemed necessary, can be formulated.

1.1.4            As part of the EIA study for the Project, CH2M HILL Hong Kong Limited (the Consultant) has been commissioned as the lead consultant to prepare this EM&A manual in associated with RPS, Asia Ecological Consultant, ADI Ltd. and Archaeological Assessments. 

1.1.5            Through the EIA study for the Project, a number of environmental mitigation measures are recommended to be implemented during the construction and operational phases of the Project.  These mitigation measures and their implementation requirements are summarised in the Implementation Schedule contained in Appendix I of this EM&A Manual.

1.1.6            In order to ensure that these recommended environmental mitigation measures are fully and effectively implemented, the EIA Report for the Project recommended the following:

·        Carrying out of EM&A works with respect to construction dust and noise during the construction phase of the Project;

·        Carrying out water quality monitoring during the construction phase;

·        Carrying out landscape and visual monitoring during the construction phase;

·        Checking of construction waste management practices through an environmental audit process; and

·        Carrying out ecological monitoring during the construction and operation phase.

1.1.7            These EM&A works are recommended to be carried out by an Environmental Team (ET) formed before the commencement of the construction works.

1.1.8            This Manual provide systematic procedures for the carrying out of recommended monitoring and auditing works for checking of potential environmental impacts which may arise from the project.  Mitigation measures recommended in the EIA Report for each key environmental aspect are also summarised and presented.

1.1.9            Environmental regulations currently enforced in Hong Kong pertaining to air quality, noise and waste, etc. and the recommendations given in the EIA study report for the Project have been observed in the preparation of this Manual.

 

1.2       Objectives of this EM&A Programme

1.2.1            The main objectives of the EM&A programme include:

1.      To provide a database on baseline environmental quality for subsequent checking of any short or long term environmental impacts arising from the Project;

2.      To provide information at an early stage for identification of potential problem areas and formulation of additional environmental mitigation measures where necessary should any of the environmental control measures or practices fail to achieve the target standards;

3.      To monitor the performance of the Project from an environmental viewpoint and the sufficiency and effectiveness of the implemented mitigation measures;

4.      To verify the environmental impacts predicted in the EIA Study for the Project;

5.      To determine compliance of the Project with relevant regulatory standards, requirements and guidelines;

6.      To take remedial action should unexpected problems or unacceptable impacts are identified;

7.      To provide baseline and compliance monitoring data to assist the carrying out of effective environmental audits.

 

1.3       Content of this EM&A Manual

1.3.1            The recommended EM&A programme in this Manual contains the following information:

1.      Duties of the Environmental Team (ET) in the environmental monitoring and audit programme;

2.      Information on project organisation, construction schedule and activities;

3.      Information on the tentative construction programme and the necessary environmental monitoring and audit programme to track the varying environmental impacts;

4.      Definition of Action and Limit levels, and establishment of Event and Action Plans;

5.      Requirements of reviewing pollution sources and work procedures in the event of non-compliance of the environmental criteria;

6.      Requirements of presentation of environmental monitoring and audit data and appropriate reporting procedures;

7.      An Implementation Schedule (Appendix I) of the environmental mitigation measures recommended in the EIA report for the Project;

8.      Record forms (Appendix II) to be adopted where applicable during the construction phase of the Project.

1.3.2            The EM&A Manual shall be regarded as an evolving document that should be updated when necessary in order to maintain its relevance during the detailed design stage and/or the construction phase (e.g. when alternative monitoring locations are proposed).  The updated EM&A Manual shall be submitted to the ER and EPD for agreement.

2.                  Project Description

2.1       The Subject Site and its Environs

2.1.1            The Subject Site is located at Lot 1457 R.P. in D.D. 123, Fung Lok Wai and the total site area is about 80.1 ha. The about 4 ha residential site will be formed by filling the fishponds at the southern part of the Subject Site with a WNR to be established to its north. The access road connects the Project to the Yuen Long Industrial Area through existing Fuk Shun Street. Approximately half of the proposed Fung Lok Wai Wetland Nature Reserve lies within the Mai Po Inner Deep Bay Ramsar Site (Buffer Zone 1), with the remaining area within Buffer Zone 2. The northern boundary adjoins the Inner Deep Bay Site of Special Scientific Interest (SSSI).

 

2.2       Implementation Schedule of the Project

2.2.1             shows the tentative construction programme of the Project. Construction activities are planned to commence in the 3rd quarter of 2010 for completion in the 3rd quarter of 2016. i.e. a total of about 6 years.

2.2.2            The construction programme consists of the following three main phases: -

1.      First phase (3rd quarter of 2010 to 2nd quarter of 2013) - establishment of the Wetland Nature Reserve (WNR). Key construction activities to be carried out include:

·              Relocating water from Sector 1, Sector 2 and Sector 3 ponds at different phases;

·              Draining, removing bunds and installing water controls at Sector 1, Sector 2 and Sector 3 of the WNR at different phases;

·              Re-filling ponds at Sector 1, Sector 2 and Sector 3 of the WNR;

·              Selective felling and vegetation management at Sector 1, Sector 2 and Sector 3 of the WNR at different phases;

·              Land formation and water control structures construction of the Marshland area;

·              Habitat creation of the Marshland area;

·              Constructing facilities of the Marshland area, such as board walks, hides, toilets and shelters.

2.      Second phase (2nd quarter of 2011 to 3rd quarter of 2016) - construction works for development area. Key construction activities to be carried out are listed below:

·              Site clearance for the construction works for development area;

·              Pond draining and dredging at built area;

·              Delivery of fill material by trucks to the site;

·              Spreading and compaction of fill material at built area;

·              Foundation and superstructure works for buildings;

·              Construction of sewage pump house;

·              Laying of drainage, sewerage and utilities;

·              Paving of internal access road.

3.      Third phase (4th quarter of 2014 to 3rd quarter of 2016) – widening works of the access road leading to the Project site. Key construction activities include:

·              Site clearance and formation for the widening of the Access Road leading to the site;

·              Laying of drainage, sewerage and utilities;

·              Formation of road sub-base, levelling and compaction;

·              Road paving and installation of road furniture;

·              Construction of landscape works;

·              Soft landscape establishment works.

2.2.3             sets out the indicative boundary of the various site portions.

 

2.3       Environmental Monitoring and Audit Requirements

2.3.1            The following areas, identified in the EIA for this Project, will require EM&A during the construction or operational phase:

·        Air Quality: construction dust

·        Noise Impact: construction noise

·        Water Quality

·        Waste Management

·        Ecology

·        Landscape and Visual


3.                  Project Organisation

3.1.1            The key parties in an EM&A programme include the Contractor, the Engineer[1] or the Engineer’s representative (ER)1, the Environmental Team (ET), the Independent Checker (Environment) (IC(E)) and the Environmental Protection Department (EPD). Sufficient and suitably qualified professional and technical staff shall be employed by the respective parties to ensure full compliance with their duties and responsibility, as required under the EM&A programme for the duration of the project.

3.1.2            A typical construction phase environmental monitoring and audit procedure is enclosed in Appendix III for reference.

 

Environmental Team

3.1.3            An Environmental Team (ET) shall be appointed to carry out the recommended EM&A works for the Project.  The ET shall not be in any way an associated body of the Contractor. The ET shall be under the supervision of the ET Leader[2] in fulfilling the EM&A duties specified in this Manual.  The ET Leader shall plan, organise and manage the implementation of the EM&A programme, and to ensure that the EM&A works are undertaken to the required standards.  The ET Leader shall have relevant professional qualifications in Environmental Sciences or Environmental Engineering, and possesses at least 7 years experience in EM&A and/ or environmental management.

3.1.4            The ET Leader shall be responsible for the implementation of the EM&A programme in accordance with the EM&A requirements specified in this Manual.  The ET Leader shall keep a contemporaneous log-book of each and every instance or circumstance or change of circumstances which may affect the EIA and each and every non-compliance with the Environmental Permit or the recommendations in the EIA report.  This log-book shall be kept readily available for inspection by the IC(E), and Director of Environmental Protection (DEP) or his authorized officers.  The ET shall not be an associated body of the IC(E) in the project.

3.1.5            The board categories of woks of the ET comprise the followings:

1.      Sampling, analysis and statistical evaluation of monitoring parameters with reference to the EIA study recommendations and requirements;

2.      Environmental site surveillance;

3.      Audit of compliance with environmental protection, and pollution prevention and control regulations;

4.      Monitor the implementation of environmental mitigation measures;

5.      Monitor compliance with the environmental protection clauses/specifications in the Contract;

6.      Review establishment, construction and operation programmes of the Project and provide comments as necessary;

7.      Review work methodologies which may affect the extent of environmental impact during the establishment, construction and operation phases and comment as necessary;

8.      Complaint investigation, evaluation and identification of corrective measures;

9.      Liaison with the Project Independent Checker (Environmental) (IC(E)) on all environmental performance matters, and timely submission of all relevant EM&A proforma for IC(E)’s approval;

10.   Advice to the Contractor on environmental improvement, awareness, enhancement matters, etc., on site; and

11.   Timely submission of the EM&A report to the Project Proponent and the DEP.

 

3.1.6            In the event of any exceedance in action/ limit levels, the ET shall immediately inform the IC(E), Engineer/ ER and the Contractor so that appropriate remedial action can be undertaken by the Contractor promptly.  The ET is also responsible for the preparation of the monthly EM&A reports for submission to IC(E), the Contractor and the Engineer/ ER, and through the Engineer/ ER to EPD.  The ET shall assist the Contractor and the Engineer/ ER in formulating any necessary corrective actions and/ or additional mitigation measures, and liaising with relevant Government Departments where necessary.

 

Independent Checker (Environment)

3.1.7            The Independent Checker (Environment) (IC(E)) shall advise the ER on environmental issues related to the project.  The IC(E) shall not be in any way an associated body of the Contractor or the ET for the Project. The IC(E) shall be empowered to audit from an independently viewpoint the environmental performance during the construction and operation of the Project.  The IC(E) shall be a person who has at least 7 years’ experience in EM&A or environmental management.  The IC(E) shall be responsible for the duties defined in the Environmental Permit and this EM&A Manual, and shall audit the overall EM&A programme, including the implementation of all environmental mitigation measures, submissions required in this EM&A Manual, and any other submissions required under the Environmental Permit.  The IC(E) shall be responsible for verifying the environmental acceptability of permanent and temporary works, relevant design plans and submissions under the Environmental Permits.  The IC(E) shall verify the log-book prepared and kept by the ET Leader.  The IC(E) shall notify DEP by fax, within 24 hours of each and every occurrence, change of circumstances or non-compliance with the EIA Report or the Environmental Permit, which might affect the monitoring or control of adverse environmental impact. 

3.1.8            The main duty of the IC(E) is to carry out independent environmental audit of the Project. This shall include, inter alias, the followings:

1.      Review and audit in an independent, objective and professional manner in all aspects of the EM&A programme;

2.      Validate and confirm the accuracy of monitoring results; appropriateness of monitoring equipment, monitoring locations with reference to the locations of the nearby sensitive receivers, and monitoring procedures;

3.      Carry out random sample check and audit on monitoring data and sampling procedures, etc;

4.      Conduct random site inspection;

5.      Audit the EIA recommendations and requirements against the status of implementation of environmental protection measures on site;

6.      Review the effectiveness of environmental mitigation measures and project environmental performance;

7.      On a need basis, verify and certify the environmental acceptability of the construction methodology (both temporary and permanent works), relevant design plans and submissions under the environmental permit. Where necessary, the IC(E) shall agree in  consultation with the ET Leader and the Contractor the least impact alternative;

8.      Verify investigation results of complaint cases and the effectiveness of corrective measures;

9.      Verify EM&A report submitted and certified by the ET Leader; and

10.   Feedback audit results to ET/ER by signing according to the Event/ Action Plans specified in this EM&A Manual.

 

The Contractor

3.1.9            The Contractor is responsible for providing requested information to the ET in the event of any exceedance in the environmental criteria (action/ limit levels) specified in this Manual or other current environmental standards, and to rectify unacceptable practices.  The Contractor shall discuss with the ET, IC(E) and ER on any additional mitigation measures identified to be required by the ET and implement the agreed measures to alleviate any identified environmental impact to acceptable levels.  The Contractor shall report to the ET on the actions taken targeting at environmental protection for inclusion in the monthly report to be prepared by the ET.

 

The Engineer or the Engineer’s Representative

3.1.10         The Engineer, or the ER shall be responsible for overseeing the operations of the Contractor, the ET.  He shall advise, co-ordinate and give instruction when appropriate for efficient implementation of any specific environmental mitigation measures identified to be required by the contractor, and/or outstanding EM&A works required to be carried out by ET in consultation with the IC(E).  The ER shall supervise the Contractor’s activities and ensure that the requirements in the EIA Report and EM&A Manual are fully complied with.  He shall inform the Contractor when action is required to reduce impacts in accordance with the Event/ Action Plans. He shall review the EM&A Reports submitted by the ET and follow up the recommendations.  He shall ensure that the Contractor is implementing the environmental controls and mitigation measures as set out in the EIA report and EM&A Manual, as well as additional measures necessary for compliance with the relevant environmental standards.  


4.                  Construction dust monitoring

4.1       Air Quality Parameters

4.1.1            Monitoring and audit of Total Suspended Particulate (TSP) levels shall be carried out by the ET during the construction phase of Road A, which include site formation, slope construction and subsequent roadwork, to ensure that any deteriorating air quality could be readily detected and timely action taken to rectify the situation.

4.1.2            24-hour and 1-hour Total Suspended Particulate (TSP) levels shall be measured according to the recommended programme.  24-hour and 1-hour TSP levels shall be measured by following the standard high volume sampling method as set out in Title 40 of the Code of Federal Regulations, Chapter 1 (Part 50), Appendix B.

4.1.3            Upon approval of the ER on the advice of EPD, 1-hour TSP levels can alternatively be measured by direct reading methods which are capable of producing comparable results as that by the high volume sampling method, to indicate short event impacts.  However, the ET should submit sufficient information to the IC(E) and the ER to prove that the instrument is capable of achieving a comparable result as that a High Volume Sampler (HVS) and maybe used for 1-hr sampling.

4.1.4            All relevant data including temperature, pressure, weather conditions, elapsed-time meter reading for the start and stop of the sampler, identification and weight of the filter paper, and other special phenomena and work progress of the concerned site etc. shall be recorded down in details, where appropriate.  A sample data sheet is shown in  .

 

4.2       Monitoring Equipment

4.2.1            Regarding the high volume sampling method, HVS in compliance with the following specifications shall be used for carrying out the 1-hour and 24-hour TSP monitoring:

1.      0.6-1.7 m3/min. (20-60 SCFM) adjustable flow range;

2.      Equipped with a timing/control device with ±5 minutes accuracy for 24 hours operation;

3.      Installed with elapsed-time meter with ±2 minutes accuracy for 24 hours operation;

4.      Capable of providing a minimum exposed area of 406 cm2 (63 in2);

5.      Flow control accuracy: ±2.5% deviation over 24-hr sampling period;

6.      Equipped with a shelter to protect the filter and sampler;

7.      Incorporated with an electronic mass flow rate controller or other equivalent devices;

8.      Equipped with a flow recorder for continuous monitoring;

9.      Provided with a peaked roof inlet;

10.   Incorporated with a manometer;

11.   Able to hold and seal the filter paper to the sampler housing at horizontal position;

12.   Easy to change the filter; and

13.   Capable of operating continuously for 24-hr period.

4.2.2            If the ET proposes to use a direct reading dust meter to measure 1-hr TSP levels, he shall submit sufficient information to the IC(E) to prove that the instruments is capable of achieving a comparable result as that the HVS and may be used for the 1-hr sampling. The instrument shall also be calibrated regularly, and the 1-hr sampling shall be determined periodically by HVS to check the validity and accuracy of the results measured by direct reading method.

4.2.3            During the course of the project, the ET is responsible for provision of the monitoring equipment. He shall ensure that sufficient number of HVSs with an appropriate calibration kit, and direct reading dust meters are available for the carrying out of baseline monitoring, regular impact monitoring and ad hoc monitoring.

4.2.4            The HVSs shall be equipped with an electronic mass flow controller and be calibrated against a traceable standard at regular intervals.  All the equipment, calibration kit, filter papers, etc. shall be clearly labelled.

4.2.5            Initial calibration of HVSs shall be conducted upon installation and thereafter at bi-monthly intervals.  The transfer standard shall be traceable to the internationally recognised primary standard and be calibrated annually.  The calibration data shall be properly documented for future reference by the concerned parties such as the IC(E).  All the data should be converted into standard temperature and pressure condition.

4.2.6            The flow-rate of the sampler before and after the sampling exercise with the filter in position shall be verified to be constant and be recorded down in the data sheet given in  .

4.2.7            Wind data monitoring equipment shall also be provided and set up at a conspicuous location for logging wind speed and wind direction near to the dust monitoring locations.  The location for equipment installation shall be proposed by the ET and agreed with the ER and IC(E).  For installation and operation of wind data monitoring equipment, the following points shall be observed:

1.      The wind sensors should be installed on masts at an elevated level 10m above ground so that they are clear of obstructions or turbulence caused by the buildings;

2.      The wind data should be captured by a data logger and to be downloaded for processing at least once a month;

3.      The wind data monitoring equipment should be re-calibrated at least once every six months; and

4.      Wind direction should be divided into 16 sectors of 22.5 degrees each.

4.2.8            In exceptional situations, the ET may propose alternative methods to obtain representative wind data upon approval from the ER and agreement from the IC(E).

 

4.3       Laboratory Measurement / Analysis

4.3.1            A clean laboratory with constant temperature and humidity control, and equipped with necessary measuring and conditioning instruments, to handle the dust samples collected, shall be available for sample analysis, and equipment calibration and maintenance.  The laboratory should be HOKLAS accredited.

4.3.2            If a site laboratory is set up or a non-HOKLAS accredited laboratory is hired for carrying out the laboratory analysis, the laboratory equipment shall be approved by the ER in consultation with the IC(E) and the measurement procedures shall be witnessed by the IC(E) and the ER.  The ET shall provide the ER with one copy of the Title 40 of the Code of Federal Regulations, Chapter 1 (Part 50), Appendix B for his reference.

4.3.3            Filter paper of size 8”x10” shall be labelled before sampling.  It shall be a clean filter paper with no pinhole, and shall be conditioned in a humidity controlled chamber for over 24-hr and be pre-weighed before use for the sampling.

4.3.4            After sampling, the filter paper loaded with dust shall be kept in a clean and tightly sealed plastic bag. The filter paper is then returned to the laboratory for reconditioning in the humidity controlled chamber followed by accurate weighing by an electronic balance with readout down to 0.1 mg.  The balance shall be regularly calibrated against a traceable standard.

4.3.5            All the collected samples shall be kept in a good condition for 6 months before disposal.

 

4.4       Proposed Monitoring Locations

4.4.1            The air quality impact assessment presented in the EIA report indicated that the nearby air sensitive receivers (ASRs) would not be subjected to adverse dust impact among all phases of the project when standard dust mitigation measures are properly applied onsite.  The dust mitigation measures have been recommended and shall be implemented by the Contractor in accordance with the requirements under the Air Pollution Control (Construction Dust) Regulation.  The Contractor shall be responsible for the design and implementation of the dust mitigation measures.

4.4.2             shows the locations of the proposed air quality monitoring locations (AM1 to AM 7) identified for the air quality monitoring for the three phases of the construction programme as mentioned in Section 2.2.2.  Table 4-1 summarizes the locations of air quality monitoring stations.  The appointed ET may like to propose alternative monitoring locations taking into consideration of the latest status, availability and/or accessibility of the various possible monitoring locations.  The alternative monitoring locations proposed by the ET shall be approved by the ER and agreed by IC(E).

             Table 41           Locations of Air Quality Monitoring Stations

Monitoring Station ID

Category

AM1

Phase 1

 

AM2

Phase 1

 

AM3

Phase 1 & 2

 

AM4

Phase 2 & 3

 

AM5

Phase 2

 

AM6

Phase 3

 

AM7

Phase 3

 

 

4.4.3            When alternative monitoring locations are proposed, the following criteria should be followed as far as practicable:

·        At the site boundary or such locations close to the major dust emission sources;

·        Close to the sensitive receptors; and

·        Take into account the prevailing meteorological conditions.

4.4.4            The ET Leader shall agree with the ER in consultation with the IC(E) on the position of the HVSs for installation of the monitoring equipment. When positioning the samplers, the following points shall be noted:

·        A horizontal platform with appropriate support to secure the samplers against gusty wind should be provided;

·        No two samplers should be placed less than 2 meter apart;

·        The distance between the sampler and an obstacle, such as buildings, must be at least twice the height that the obstacle protrudes above the sampler;

·        A minimum of 2 metres of separation from walls, parapets and penthouses is required for rooftop samplers;

·        A minimum of 2 metre separation from any supporting structure, measured horizontally is required;

·        No furnace or incinerator flue is nearby;

·        Airflow around the sampler is unrestricted;

·        The sampler is more than 20 metres from the dripline;

·        Any wire fence and gate, to protect the sampler, should not cause any obstruction during monitoring;

·        Permission must be obtained to set up the samplers and to obtain access to the monitoring stations; and

·        A secured supply of electricity is needed to operate the samplers.

 

4.5       Baseline Monitoring

4.5.1            Baseline monitoring shall be carried out by the appointed ET Leader at all of the designated monitoring locations for at least 14 consecutive days to obtain daily 24-hr TSP samples.  1-hr sampling shall also be done at least 3 times per day during daytime when there are planned construction activities.  The ET Leader should inform the IC(E) of the baseline monitoring programme before commencement such that the IC(E) can conduct on-site audit to ensure accuracy of the baseline monitoring results.

4.5.2            During the baseline monitoring, there should not be any dust generation construction activities in the vicinity of the monitoring stations arising from the subject site.

4.5.3            In case the baseline monitoring cannot be carried out at the designated monitoring locations during the baseline monitoring period, the ET Leader shall carry out the monitoring at alternative locations which can effectively represent the baseline conditions at the impact monitoring locations.  The alternative baseline monitoring locations shall be approved by the ER and agreed with IC(E).

4.5.4            In exceptional cases, when insufficient baseline monitoring data or questionable results are obtained, the ET Leader shall liaise with the IC(E) and EPD to agree on an appropriate set of data to be used as a baseline reference and submit to ER for approval.

4.5.5            If the ET Leader considers that the ambient conditions have been changed and a repeat of the baseline monitoring is required to be carried out for obtaining the updated baseline levels, the monitoring should be carried out at times when the contractor’s activities are not generating dust in the proximity of the monitoring station.  Should change in ambient conditions be determined, the baseline levels and, in turn, the air quality criteria, should be revised.  The revised baseline levels and air quality criteria should be agreed with the IC(E) and EPD.

 

4.6       Impact Monitoring

4.6.1            The ET Leader shall carry out impact monitoring during the course of the construction works at the recommended dust monitoring station.  For regular impact monitoring, a sampling frequency of at least once in every six-days shall be followed at the selected monitoring stations for 24-hr TSP monitoring.  The specific time to start and stop the 24-hr TSP monitoring shall be clearly defined and be strictly followed by the operator.  Before commencement, the ET Leader shall inform the IC(E) of the impact monitoring programme such that the IC(E) can conduct on-site audit to ensure accuracy of the impact monitoring results.

4.6.2            For 1-hr TSP monitoring, a sampling frequency of at least three times in every six-days shall be undertaken during the hours when the highest dust impact is predicted to occur based on the nature of the construction works.  The Contractor shall inform the ER, IC(E) and ET Leader in advice the time when blasting activities are planned for the team to formulate the dust monitoring programme accordingly.  The 1-hr TSP monitoring can be undertaken on the same day as the 24-hr TSP monitoring.

4.6.3            In case of non-compliance with the air quality criteria, more frequent monitoring exercise, as specified in the following section, shall be conducted within 24 hours after the result is obtained.  This additional monitoring shall be continued until the excessive dust emission or the deterioration in air quality is rectified.

4.7       Event and Action Plan for Air Quality

4.7.1            The baseline monitoring results form the basis for determining the air quality criteria for the impact monitoring.  The ET shall compare the impact monitoring results with air quality criteria set up for 24-hour TSP and 1-hour TSP.  Table 4-2 shows the air quality criteria, namely Action and Limit levels to be used.  Should non-compliance of the air quality criteria occurs, the ET shall undertake the relevant action in accordance with the Action Plan in Table 4-3.

Table 42          Action and Limit Levels for Air Quality

Parameters

Action

Limit

24 Hour TSP Level in mg/m³

For baseline level £ 200 mg/m³, Action level = (Baseline level x 1.3 + Limit level) /2;

For baseline level > 200 mg/m³, Action level = Limit level;

260 mg/m³

1 Hour TSP Level in mg/m³

For baseline level £ 384 mg/m³, Action level = (Baseline level x 1.3 + Limit level) /2;

For baseline level > 384 mg/m³, Action level = Limit level;

500mg/m³

 

Table 43          Event/Action Plan for Air Quality

 

ACTION

EVENT

ET Leader

IC(E)

ER

CONTRACTOR

ACTION LEVEL

Exceedance for one sample

1.     Identify source, investigate the causes of exceedance and propose remedial measures

2.     Inform ER, IC(E) and Contractor

3.     Repeat measurement to confirm finding

4.     Increase monitoring frequency to daily

1.     Check monitoring data submitted by ET

2.     Check Contractor’s working method

1.     Notify Contractor

1.  Rectify any unacceptable practice

2.  Amend working methods if appropriate

Exceedance for two or more consecutive samples

1.     Identify source, investigate the causes of exceedance and propose remedial measures

2.     Inform ER, IC(E) and Contractor

3.     Repeat measurements to confirm findings

4.     Increase monitoring frequency to daily

5.     Discuss with IC(E) and Contractor on remedial actions

6.     If exceedance continues, arrange meeting with IC(E) and ER

7.     If exceedance stops, cease additional monitoring

1.     Checking monitoring data submitted by ET

2.     Check Contractor’s working method

3.     Discuss with ET Leader and Contractor on possible remedial measures

4.     Advise the ER on the effectiveness of the proposed remedial measures

5.     Supervisor implementation of remedial measures

1.     Confirm receipt of notification of failure in writing

2.     Notify Contractor

3.     Ensure remedial measures properly implemented

1.     Submit proposals for remedial actions to IC(E) within 3 working days of notification

2.     Implement the agreed proposals

3.     Amend proposal if appropriate

LIMIT LEVEL

Exceedance for one sample

 

1.     Identify source, investigate the causes of exceedance and propose remedial measures

2.     Inform ER, EPD, IC(E) and Contractor

3.     Repeat measurement to confirm finding

4.     Increase monitoring frequency to daily

5.     Assess effectiveness of Contractor's remedial actions and keep IC(E), EPD and ER informed of the results

1.     Checking monitoring data submitted by ET

2.     Check Contractor’s working method

3.     Discuss with ET and Contractor on possible remedial measures

4.     Advise the ER on the effectiveness of the proposed remedial measures

5.     Supervisor implementation of remedial measures

1.     Confirm receipt of notification of failure in writing

2.     Notify Contractor

3.     Ensure remedial measures properly implemented

1.     Take immediate action to avoid further exceedance

2.     Submit proposals for remedial actions to IC(E) within 3 working days of notification

3.     Implement the agreed proposals

4.     Amend proposal if appropriate

Exceedance for two or more consecutive samples

1.     Identify source, investigate the causes of exceedance and propose remedial measures

2.     Notify ER, EPD, IC(E) and Contractor

3.     Repeat measurement to confirm findings

4.     Increase monitoring frequency to daily

5.     Carry out analysis of Contractor’s working procedures to determine possible mitigation to be implemented

6.     Arrange meeting with IC(E) and ER to discuss the remedial actions to be taken

7.     Assess effectiveness of Contractor's remedial actions and keep IC(E), EPD and ER informed of the results

8.     If exceedance stops, cease additional monitoring

1.     Discuss amongst ER, ET and Contractor on the potential remedial actions

2.     Review Contractor’s remedial actions whenever necessary to assure their effectiveness and advise the ER accordingly

3.     Supervise the implementation of remedial measures

1.     Confirm receipt of notification of failure in writing

2.     Notify Contractor

3.     In consultation with the IC(E), agree with the Contractor on the remedial measures to be implemented

4.     Ensure remedial measures properly implemented

5.     If exceedance continues, consider what portion of the work is responsible and instruct the Contractor to stop that portion of work until the exceedance is abated

1.     Take immediate action to avoid further exceedance

2.     Submit proposals for remedial actions to IC(E) within 3 working days of notification

3.     Implement the agreed proposals

4.     Resubmit proposals if problem still not under control

5.     Stop the relevant portion of works as determined by the ER until the exceedance is abated

4.8       Dust Mitigation Measures

4.8.1            The EIA report has recommended various dust control and mitigation measures.  The following measures are specifically recommended for implementation together with those presented in the Air Pollution Control (Construction Dust) Regulation.

General Site Works

1.    Use appropriate working methods to minimize dust emission;

2.    Ensure all dust control system are properly functioning during construction operation;

3.    Twice daily watering of all dust emission sources, adjust frequency depending on meteorological conditions;

4.    Provide hard paved surface for site area with regular vehicular movements;

5.    Impose a speed limit of 10km/hr for dump trucks and other vehicles traveling on unpaved site roads;

6.    Cover side and tail boards of dusty trucks with tarpauline which extends at least 300m over edges of side and tail boards;

7.    Provide wheel-wash troughs and hoses at exit points of site;

8.    Arrange truck to unload filling material to drained ponds directly without stockpiling at site;

9.    Keep filled ponds and stockpile wet by water spraying;

10. Side enclosure and covering, where practicable, of any aggregate or other dusty material storage piles to reduce emissions;

11. All dusty material should be sprayed with water immediately prior to any loading, unloading or transfer operation to minimise dust emission;

12. Instigation of a programme to monitor the construction process in order to enforce controls and modify methods of work if dusty conditions arise; and

13. Phasing of dusty construction activities to control dust generation during the construction period.

4.8.2            The effectiveness of these dust control measures shall be checked by the EM&A requirements recommended in the above section.  If the measures adopted and implemented by the contractor are found not be sufficient to keep dust levels within acceptable levels, the Contractor shall liaise with the ET Leader on the implementation of some other mitigation measures. The additional dust mitigation measures shall be approved by the ER before implementation.


5.                   Construction NOISE Monitoring

5.1       Noise Parameters

5.1.1            The construction noise level shall be measured in terms of the A-weighted equivalent continuous sound pressure level (LAeq).  LAeq(30 min.) shall be used as the monitoring parameter for the time period between 0700-1900 hours on normal weekdays.  For all other time periods, LAeq(5 min) shall be employed for comparison with the NCO criteria.

5.1.2            As supplementary information for data auditing, statistical results such as L10 and L90 shall also be obtained for reference. A sample data record sheet is shown in  for reference.

 

5.2       Monitoring Equipment

5.2.1            As referred to in the Technical Memorandum issued under the Noise Control Ordinance (NCO), sound level meters in compliance with the International Electrotechnical Commission Publications 651: 1979 (Type 1) and 804: 1985 (Type 1) specifications shall be used for carrying out the noise monitoring.  Immediately prior to and following each noise measurement, the accuracy of the sound level meter shall be checked using an acoustic calibrator generating a known sound pressure level at a known frequency.  Measurements may be accepted as valid only if the calibration levels before and after the noise measurement agree to within 1.0dB.

5.2.2            Noise measurements should be made in accordance with standard acoustical principles and practices in relation to weather conditions.

5.2.3            The ET Leader is responsible for the availability of the monitoring equipment.  He shall ensure that sufficient noise measuring equipment and associated instrumentation are available for carrying out the baseline monitoring, regular impact monitoring and ad hoc monitoring.  All the equipment and associated instrumentation shall be clearly labelled.

 

5.3       Monitoring Locations

5.3.1            The proposed locations for noise monitoring for the three phases of the construction programme as mentioned in Section 2.2.2, namely NM1 to NM7, are shown in  and summarized in Table 5-1.

  Table 51      Locations of Construction Noise Monitoring Stations

Monitoring Station ID

Category

NM1

Phase 1

 

NM2

Phase 1

 

NM3

Phase 1 & 2

 

NM4

Phase 2 & 3

 

NM5

Phase 2

 

NM6

Phase 3

 

NM7

Phase 3

 

 

5.3.2            The appointed ET Leader may like to propose alternative monitoring locations based on consideration of the latest status, availability and/or accessibility of the various possible monitoring locations. Alternative monitoring locations proposed by the ET Leader shall be approved by the ER and agreed by EPD and the IC(E).

5.3.3            When alternative monitoring locations are proposed, the monitoring locations should be chosen based on the following criteria:

·        At locations close to the major site activities which are likely to have noise impacts;

·        Close to the noise sensitive receivers; and

·        For monitoring locations located in the vicinity of the sensitive receivers, care should be taken to cause minimal disturbance to the occupants during monitoring.

5.3.4            The monitoring station shall normally be at a point 1m from the exterior of the sensitive receivers building facade and be at a position 1.2m above ground.  If there is problem with access to the normal monitoring position, an alternative position may be chosen, and a correction to the measurements shall be made.  For reference, a correction of +3dB(A) shall be made to free field measurement data.  The ET Leader shall agree with the IC(E) on the monitoring position and the corrections adopted.  Once the positions for the monitoring stations are chosen, the baseline monitoring and the impact monitoring shall be carried out at the same positions.

 

5.4       Baseline Monitoring

5.4.1            Baseline monitoring shall be carried out by the ET prior to the commencement of the construction works.  The baseline monitoring shall be carried out daily for a period of at least two weeks.  A schedule on the baseline monitoring for construction noise shall be submitted to the ER for approval before the commencement of the monitoring. 

5.4.2            There shall not be any construction activities in the vicinity of the stations during the baseline monitoring.

5.4.3            In exceptional cases, such as insufficient baseline monitoring data or questionable results are obtained, the ET Leader shall liaise with IC(E) and EPD for agreement on an appropriate set of data to be used as the baseline reference and submit to the ER for approval.

 

5.5       Impact Monitoring

5.5.1            Noise monitoring shall be carried out by the ET at the selected representative noise monitoring stations.  The following is an initial guide on the regular monitoring frequency for each station on a per week basis when noise generating activities are underway:-

(a) one set of measurement between 0700-1900 hours on normal weekdays (i.e. Monday to Saturday);

(b) one set of measurement between 1900-2300 hours;

(c) one set of measurement between 2300-0700 hours of next day; and

(d) one set of measurement between 0700-1900 hours on holidays.

5.5.2            For the measurements (b), (c) and (d) above, one set of measurement shall at least include 3 consecutive Leq(5min) results for construction works to be carried out during restricted hours.  General construction work carrying out during restricted hours is controlled by construction noise permit (CNP) system under the NCO.  Without a valid construction noise permit (CNP) issued by EPD under Noise Control Ordinance (NCO), no construction work shall be carried out during restricted hours[3]. Once a valid CNP for the construction activities is issued by EPD, the ET Leader shall be appointed to carry out additional noise measurements and the IC(E) shall also be appointed to carry out additional site investigations and audits during the restricted hours specified in the CNP. 

5.5.3            Moreover, the ET Leader shall propose an additional noise monitoring schedule certified by the IC(E) to the ER for approval before the commencement of the construction works during the restricted hours.

5.5.4            In case of non-compliance with the construction noise criteria, more frequent monitoring as specified in the Action shall be carried out.  This additional monitoring shall be continued until the recorded noise levels are rectified or proved to be irrelevant to the construction activities.

 

5.6       Event and Action Plan for Construction Noise

5.6.1            The Action and Limit Levels for construction noise are defined in Error! Reference source not found..  In case that a valid CNP is issued by EPD, the Action Level is the same as the non-restricted hours and the Limit Level shall be the same as the standard stated in the CNP.

5.6.2            Should non-compliance of the criteria occurs, actions in accordance with the Action Plan as shown in Table5-3 should be carried out.

 

Table 52          Action and Limit Levels for Construction Noise

Time Period

Action

Limit

0700-1900 hrs on normal weekdays

When one documented complaint is received

75* dB(A)

Restricted hours

Same as CNP

* Reduce to 70dB(A) for schools and 65dB(A) during school examination periods.

 

Table 53          Event and Action Plan for Construction Noise Monitoring

 

ACTION

EVENT

ET Leader

IC(E)

ER

CONTRACTOR

ACTION LEVEL

Action Level

1.     Notify ER, IC(E) and Contractor

2.     Carry out investigation

3.     Report the results of investigation to the ER, IC(E) and Contractor

4.     Discuss with the IC(E) and Contractor, and formulate remedial measures

5.     Increase monitoring frequency to check mitigation effectiveness

1.     Review the analysed results submitted by the ET

2.     Review the proposed remedial measures by the Contractor and advise the ER accordingly

3.     Supervise the implementation of remedial measures

1.    Confirm receipt of notification of failure in writing

2.    Notify Contractor

3.    Require Contractor to propose remedial measures fro the analysed noise problem

4.    Ensure remedial measures are properly implemented

1.    Submit noise mitigation proposals to IC(E)

2.    Implement noise mitigation proposals

Limit Level

1.     Notify IC(E), ER, EPD and Contractor

2.    Identify source

3.    Repeat measurement to confirm findings

4.    Increase monitoring frequency to daily

5.    Carry out analysis of Contractor’s working procedures to determine possible mitigation to be implemented

6.    Inform IC(E), ER and EPD the causes & actions taken for the exceedances

7.    Assess effectiveness of Contractor’s remedial actions and keep IC(E), EPD and ER informed of the results

8.    If exceedance stops, cease additional monitoring

1.    Discuss amongst ER, ET, and Contractor on the potential remedial actions

2.    Review Contractor’s remedial actions whenever necessary to assure their effectiveness and advise the ER accordingly

3.    Supervise the implementation of remedial measures

1.     Confirm receipt of notification of failure in writing

2.    Notify Contractor

3.    Require Contractor to propose remedial measures for the analysed noise problem

4.    Ensure remedial measures are properly implemented

5.    If exceedance continues, consider what portion of the work is responsible and instruct the Contractor to stop that portion of work until the exceedance is abated

1.     Take immediate action to avoid further exceedance

2.    Submit proposals for remedial actions to IC(E) within 3 working days of notification

3.    Implement the agreed proposals

4.    Resubmit proposals if problem still not under control

5.    Stop the relevant portion of works as determined by the ER until the exceedance is abated

 

5.7       Noise Mitigation Measures

5.7.1            The EIA report has recommended various construction noise control and mitigation measures. These are summarised below for easy reference.  The Contractor shall be responsible for

5.7.2            Noise emissions from construction sites can be minimised by adopting a number of practicable noise mitigation options, such as:

·        Use of quiet/silenced equipment;

·        Erecting temporary noise barriers and Provision of Noise Enclosure;

·        Phasing of the Construction Activities for the Blasting Restricted Area during Site Formation; and

·        Good site practice and noise management.

Selecting Quiet/ Silenced PME

5.7.3            Quiet types of equipment for use in construction activities are available in Hong Kong.  It is advised that the contractor should diligently seek equivalent models of quiet/ silenced PMEs with SWLs similar to or less than that as presented in the EIA report as far as practicable.

5.7.4            For the types of equipment presented in Table 5-4 that are likely required in the construction works of the Project, quiet/silenced plant with SWL that is similar or less than that presented shall be adopted as far as possible.

Table 54          Quiet/ Silenced Equipment Inventory

Powered Mechanical Equipment

SWL of quiet/silenced PME, dB(A)

Bulldozer

104

Excavator

104

Compactor

105

Dump truck

103

Grader

110

Piling, large diameter bored, oscillator

115

Piling, large diameter bored, reverse circulation drill

100

Generator

95

Mobile crane

101

Concrete lorry mixer

100

Concrete pump

109

Compressor

100

Hoist, Material

95

Crane  (Tower)

95

Steel bending machine

90

Vibratory poker

98

Trench compactor

105

Lorry

101

Asphalt paver

101

Road roller

101

 

 

Use of Temporary Noise Barriers and Acoustic Enclosures

5.7.5            The erection of temporary mobile noise barriers between noise sources and NSRs will be effective in reducing the potential construction noise impact, especially for the low-rise village huts which are the target NSRs to be protected.

5.7.6            The erection of noise barriers between noise sources and NSRs will be effective in reducing the noise impact, especially for low-rise residential premises.  When required, temporary barriers of sufficient height (typically 3-5m high depending on the size of the machines that need to be screened) can be erected within a few metres from stationary plants, and at practicable distance from mobile plants operating over a small area or using a well defined route, to alleviate the construction noise impact. The minimum effective height of the noise barriers should be such that no part of the noise source will be visible from the target NSRs to be protected. The guidelines contained in the Booklet entitled “A Practical Guide for the Reduction of Noise from Construction Works” issued by EPD have recommended the design of the temporary acoustic barriers. Barriers/enclosures should have no openings or gaps, and preferably have a superficial surface density of at least 10 kg/m2. The locations of the temporary noise barriers shall be adjusted where necessary taking into consideration the locations of the noise sources and the NSRs intended to be protected.

5.7.7            Particular attention should be drawn to bored piling works at the residential area where they are considered the major construction noise sources. Noise barriers are recommended to be erected close to the stationary point of piling works during piling to alleviate the potential noise impact to the adjacent village huts.

5.7.8            To the NSRs along Fuk Shun Street which are represented by NM4, the widening works of access road is considered the major noise nuisance during the construction phase. Considering the close proximity of the village huts (NM4) to the construction site of access road, setting up of a noise barrier with approximate 3m height between the noise source and those village huts along Fuk Shun Street is considered necessary during the construction works of access road.

5.7.9            The contractor shall provide the designs of such noise barriers/acoustic enclosures certified by the ET Leader and verified by the IC(E) to EPD for approval prior to the commencement of the construction works.

Other Recommended Noise Mitigation Measures

5.7.10         To be prudent in the construction noise management, the following additional noise mitigation and good site practices are also recommended for implementation.

1.      The Contractor shall comply with and observe the Noise Control Ordinance (NCO) and its current subsidiary regulations;

2.      Before the commencement of any work, the Contractor shall submit to the Engineer for approval the method of working, equipment and sound-reducing measures intended to be used at the site;

3.      The Contractor shall devise and execute working methods that will minimise the noise impact on the surrounding environment; and shall provide experienced personnel with suitable training to ensure that these methods are implemented;

4.      Only well-maintained plants should be operated on-site;

5.      Plants should be serviced regularly during the construction programme;

6.      Machines that may be in intermittent use should be shut down or throttled down to a minimum between work periods;

7.      Methods of noise reduction suggested in BS 5228 Part I: 1997 should be referred.  For example, silencer and mufflers on construction equipment should be utilised and should be properly maintained during the construction programme;

8.      Noisy activities can be scheduled to minimise exposure of nearby NSRs to high levels of construction noise. For example, noisy activities can be scheduled for midday or at times coinciding with periods of high background noise (such as during peak traffic hours);

9.      Noisy equipment such as emergency generators shall always be sited as far away as possible from noise sensitive receivers;

10.   Mobile plants should be sited as far away from NSRs as possible; and

11.   Material stockpiles and other structures should be effectively utilised as noise barrier, where practicable.


6.                  Water Quality MOnitoring

6.1       Introduction

6.1.1            The Subject Site is surrounded by existing fishponds. The Shan Pui River and the Tai River are to the east and west of the Subject Site respectively. The Inner Deep Bay area is at the northern side of Subject Site. Potential water quality impact on these inland water bodies during the construction and operation of the Project should be minimised.

6.1.2            The Contractor shall adopt the Best Management Practices (BMPs) in controlling potential water pollution through following the guidelines for handling and disposal of construction site drainage as detailed in EPD’s ProPECC Note PN1/94 Construction Site Drainage during the construction phase.  During the operational phase, the control measures recommended in the EIA as well as in the Habitat Creation and Management Plan should be implemented.

6.1.3            Water quality monitoring at designated locations in the nearby inland water bodies are proposed to be carried out during the construction phase to monitor any sub-standard water discharge into the nearby water bodies from the site. 

6.1.4            Furthermore, since the Subject Site is located in the vicinity of the WNR, water quality monitoring shall be conducted in the vicinity of the fishpond areas during both construction and operational phases which contribute to one of the criteria for ensuring the overall ecological impacts are within acceptable levels.  Details of the ecological monitoring programme are presented in Section 9 of this EM&A Manual.

 

6.2       Water Quality Parameters

6.2.1            Required construction activities of the development will mainly be land-based.  Potential water quality impact could be resulted from runoff loaded with suspended particulate or other contaminants.  The ET should carry out spot check to ensure that the Contractor has undertaken all recommended control measures to prevent direct contact of pollutants with rainwater or runoff, and measures to abate contaminants in the stormwater runoff.

6.2.2            The parameters shown in Table 6‑1 are recommended to be recorded/ monitored in the routine monitoring programme. 

  Table 61      Water Quality Parameters

Phase

Water Quality Parameters

Construction

·    Temperature (°C)

·    pH (pH unit)

·    Turbidity (NTU)

·    Water Depth (m)

·    Salinity (mg/L)

·    Dissolved oxygen (DO) (mg/L and % of saturation)

·    Suspended solids (SS) (mg/L)

6.2.3            It is recommended to carry out sampling at least three times per week to measure turbidity, suspended solids, dissolved oxygen, pH, salinity and water temperature at a number of control and monitoring locations recommended below.  The monitoring frequency required shall be reviewed after the first three months and regularly thereafter.

6.2.4            In association, other relevant data such as monitoring locations/positions, time, water depth, water temperature, salinity, weather conditions, sea conditions, tidal stage and any special phenomena and work underways should be recorded. A sample monitoring record sheet is shown in  for reference.

 

6.3       Monitoring Equipment

6.3.1            All monitoring equipment shall be provided by the ET and approved by the ER in consultation with the IE(C).

Dissolved Oxygen and Temperature Measuring Equipment

6.3.2            The instrument shall be a portable, weatherproof dissolved oxygen measuring instrument complete with cable, sensor, comprehensive operation manuals, and use a DC power source. It should be capable of measuring:

·      a dissolved oxygen level in the range of 0-20 mg/l and 0-200% saturation; and

·      a temperature of 0-45° C.

6.3.3            It shall have a membrane electrode with automatic temperature compensation complete with a cable. Sufficient stocks of spare electrodes and cables shall be available for replacement where necessary (e.g. YSI model 59 meter, YSI 5739 probe, YSI 5795A submersible stirrer with reel and cable or an approved similar instrument).

6.3.4            Should salinity compensation not be built-in in the DO equipment, in-situ salinity shall be measured to calibrate the DO equipment prior to each DO measurement.

Turbidity Measurement Instrument

6.3.5            The instrument shall be a portable, weatherproof turbidity-measuring instrument complete with comprehensive operation manual. The equipment shall use a DC power source. It shall have a photoelectric sensor capable of measuring turbidity between 0-1000 NTU and be complete with a cable (e.g. Hach model 2100P or an approved similar instrument).

Suspended Solids

6.3.6            A water sampler comprises a transparent PVC cylinder, with a capacity of not less than 2 litres and can be effectively sealed with latex cups at both ends.  The sampler shall also have a positive latching system to keep it open and prevent premature closure until released by a messenger when the sampler is at the selected water depth (e.g. Kahlsico Water Sampler or an approved similar instrument).

6.3.7            Water samples for suspended solids measurement should be collected in high density polythene bottles, packed in ice (cooled to 4°C without being frozen), and delivered to the laboratory as soon as possible after collection.

Water Depth Detector

6.3.8            A portable, battery-operated echo sounder should be used for the determination of water depth at each designated monitoring station. This unit can either be handheld or affixed to the bottom of the work boat, if the same vessel is to be used throughout the monitoring programme.

Salinity

6.3.9            A portable salinometer capable of measuring salinity in the range of 0-40 ppt shall be provided for measuring salinity of the water at each monitoring location.

Checking and Calibration of Equipment

6.3.10         A hand-held or boat-fixed type digital Global Positioning System (GPS) with way point bearing indication or other equivalent instrument of similar accuracy shall be provided and used during monitoring to ensure the monitoring vessel is at the correct location before taking measurements.

6.3.11         All in-situ monitoring instrument shall be checked, calibrated and certified by a laboratory accredited under HOKLAS or any other international accreditation scheme before use, and subsequently re-calibrated at 3 monthly intervals throughout all stages of the water quality monitoring.  Responses of sensors and electrodes shall be checked with certified standard solutions before each use.  Wet bulb calibration for a DO meter shall be carried out before measurement at each monitoring location.

6.3.12         For the on site calibration of field equipment, the BS 127:1993, "Guide to Field and on-site test methods for the analysis of waters" shall be observed.

6.3.13         Sufficient stocks of spare parts shall be maintained for replacements when necessary.  Backup monitoring equipment shall also be made available so that monitoring can proceed uninterrupted even when some equipment is under maintenance, calibration, etc.

 

6.4       Laboratory Measurement / Analysis

6.4.1            Analysis of suspended solids shall be carried out in a HOKLAS or other internationally accredited laboratory. Water samples of about 1,000 ml shall be collected at the monitoring stations for carrying out the laboratory SS determination. The detection limit shall be 1 mgL-1 or better.  The SS determination work shall start within 24 hours after collection of the water samples. The SS determination shall follow APHA 17ed 2540D or equivalent methods subject to approval of DEP.

6.4.2            The testing laboratory shall be HOKLAS accredited (or if not, approved by the ER) and comprehensive quality assurance and control procedures in place in order to ensure quality and consistency in results.

6.4.3            If a site laboratory is set up, or a non-HOKLAS and non-international accredited laboratory, is hired for carrying out the laboratory analysis, the laboratory equipment, analytical procedures, and quality control shall be approved by the DEP. All the analyses shall be witnessed by the ER and the IC(E). The ET Leader shall provide the ER and IC(E) with one copy of the relevant chapters of the "Standard Methods for the Examination of Water and Wastewater" updated edition and any other relevant document for his reference.

6.4.4            For the testing methods of other parameters as recommended by the EIA or required by DEP, detailed testing methods, pre-treatment procedures, instrument use, Quality Assurance/Quality Control (QA/QC) details (such as blank, spike recovery, number of duplicate samples per batch, etc.), detection limits and accuracy shall be submitted to DEP for approval prior to the commencement of monitoring programme.  The QA/QC shall be in accordance with the requirement of HOKLAS or international accredited scheme.  The QA/QC results shall be reported.  DEP may also request the laboratory to carry out analysis of known standards provided by DEP for quality assurance.  Additional duplicate samples may be required by DEP for inter laboratory calibration.  Remaining samples after analysis shall be kept by the laboratory for 3 months in case repeat analysis is required.  If in-house or non-standard methods are proposed, details of the method verification may also be required to be submitted to DEP.  In any circumstance, the sample testing shall have comprehensive quality assurance and quality control programme.  The laboratory shall be prepared to demonstrate the programmes to DEP or his representatives when requested.

 

6.5       Proposed Monitoring Locations

6.5.1            It is recommended to establish control and impact monitoring station approach to monitor water quality impact during construction phase.  Control stations shall be selected to compare the water quality from potentially impacted sites with the ambient water quality.  Hence, control stations shall be located within the same water body as the impact monitoring stations but outside the vicinity of the influence of the works and, as far as practicable, not affected by any other works. 

6.5.2            The proposed water quality monitoring stations are shown in Table 6‑2.  The locations of the control stations (Stations C1 and C2) are set in the inlet points of the drainage channel “X” and “Y” in the nearby catchment areas respectively.  Corresponding impact stations (W1 and W2) are set at the outfall of drainage channel “X” and “Y”. An additional impact station W3 was set at the downstream of the Tai River to monitor the quality of water discharging into Inner Deep Bay  The monitorirng stations W1 and W2 at the upstream of Tai River can serve the purpose of control station of W3.  presents the locations of the water quality monitoring stations.

  Table 62      Locations of Water Quality Monitoring Stations

Phase

Monitoring Station ID

Category

Construction

C1

Control Station

 

C2

Control Station

 

W1

Impact Station

 

W2

Impact Station

 

W3

Impact Station

 

 

6.5.3            It is expected that the exact locations of the control and monitoring stations may need to be altered subject to the location of the construction work areas and the wastewater effluent discharge points from the site.  The Contractor shall submit the wastewater effluent discharge plan as stipulated in the Water Discharge License to the ET and the ET shall change the corresponding monitoring points in accordance to the submission.  The exact locations of the control and monitoring stations should also be confirmed by the ET taking into account factors such as accessibility, suitability, etc.  The ET shall seek approval from the IC(E) and DEP on the monitoring locations proposed prior to the commencement of the baseline and construction phase sampling programme.

6.5.4            When alternative monitoring locations are proposed, they should be chosen based on the following criteria:

·      at locations close to and preferably at the boundary of the mixing zone of the major site activities, which are likely to have water quality impacts;

·      close to the sensitive receptors which are directly or likely to be affected;

·      for monitoring locations located in the vicinity of the sensitive receptors, care should be taken to cause minimal disturbance during monitoring; and

·      control station shall be selected at a location to allow a comparison of the water quality at the potentially impacted site with the ambient water quality.  The control station shall be selected such that it is located within the same body of water as the impact monitoring station but is located outside the area of influence of the works.

6.5.5            At monitoring stations coincident with seawater intakes, the measurements should make reference to the vertical levels of the individual intake pipes.  Where the water depth is less than 6 m, the mid-depth station may be omitted.  Should the water depth be less than 3m, only the mid-depth station shall be monitored.  The ET Leader shall seek approval from the IC(E) and DEP on all monitoring station locations.  Replicates in situ measurements and sample collected from each independent sampling event are required for all parameters to ensure a robust statistically interpretable dataset.

 

6.6       Baseline Monitoring

6.6.1            Baseline conditions of water quality should be established by the ET and agreed with IC(E) and DEP.  The purposes of the baseline monitoring are to establish ambient conditions prior to the commencement of the works, to demonstrate the suitability of the proposed control and impact monitoring stations, and for establishment of the action and limit levels. 

6.6.2            The baseline conditions should be established by measuring the water quality parameters specified in section 6.2.2 above.  The measurements shall be taken at all the designated control and monitoring stations (i.e. Stations C1 and C2, W1, W2 and W3 respectively), 3 days a week, under two tidal conditions (mid-flood and mid-ebb) at 3 water depths, namely, 1 m below water surface, mid-depth and 1 m above seabed, for a period of 4 weeks prior to the commencement of construction works.  Where the water depth is less than 6 m, the mid-depth station may be omitted.  Should be water depth be less than 3 m, only the mid-depth station shall be monitored.  The interval between two sets of monitoring shall not be less than 36 hours and the baseline monitoring schedule shall be submitted to EPD at least one week prior to the commencement of the baseline monitoring.  Flow rates and sample depth shall also be recorded, where appropriate.  Also, all seasonal variations such as rainfall, tidal flow, typhoons and shipping activities shall be assessed.  The target is to collect sufficient data to enable the baseline situation, including background variation in water quality, to be quantified.  Alternative proposal including the sampling frequencies proposed by the ET should be agreed with IC(E) and DEP in prior.

6.6.3            There shall not be any major construction activities in the vicinity of the stations during the baseline monitoring.

6.6.4            In exceptional cases when insufficient baseline monitoring data or questionable results are obtained, the ET Leader shall seek approval from EPD on an appropriate set of data to be used as baseline reference.

 

6.7       Impact Monitoring

6.7.1            During the course of the construction works, impact monitoring shall be undertaken three days per week, at mid-flood and mid-ebb tides, with sampling/measurement at the designated control and monitoring stations (i.e. Stations C1 and C2, W1, W2 and W3 respectively).  The interval between two sets of monitoring shall not be less than 36 hours except where there are exceedances of Action and/or Limit levels, in which case the monitoring frequency shall be increased.

6.7.2            Measurement shall be taken at 3 water depths, namely, 1 m below water surface, mid-depth and 1 m above sea bed, except where the water depth less than 6 m, the mid-depth station may be omitted.  Should the water depth be less than 3 m, only the mid-depth station shall be monitored.

6.7.3            Upon completion of all construction activities, a post project monitoring exercise on water quality shall be carried out for four weeks in the same manner as the impact monitoring.

6.7.4            Proposed water quality monitoring schedule shall be faxed to EPD at least 1 week before the first day of the monitoring month.  EPD shall also be notified immediately for any changes in schedule by fax.

 

6.8       Event and Action Plan for Water Quality

6.8.1            The water quality criteria, namely Action and Limit levels shall be based on the results of baseline monitoring, the Water Quality Objectives, or based on the results of statistical analysis on the difference between impact monitoring results and 30% above control, and/or specific levels defined for the sensitive receivers.  Should non-compliance of the action or limit levels occurs, the ET should review and identify the potential source(s) of the impact, devise and implement appropriate mitigate measures in a collaborative manner.  The Action and Limit Levels for water quality is presented in Table 6‑3. 

6.8.2            When the monitoring results of the water quality parameters at any designated monitoring stations exceed the water quality criteria, the actions in accordance with the Event and Action Plan in Table 6‑4 shall be carried out.

Table 63          Typical Action and Limit Levels for Water Quality

Parameters

Action

Limit

DO in mg/L

(Surface, Middle & Bottom)

Surface & Middle

5%-ile of baseline data for surface and middle layer

 

Bottom

5%-ile of baseline data for bottom layer 

Surface & Middle

4 mg/L or 1%-ile of baseline data for surface and middle layer

 

Bottom

2 mg/L or 1%-ile of baseline data for bottom layer

SS in mg/L

(depth-averaged)

95%-ile of baseline data or 120% of upstream control station’s SS at the same tide of the same day

99%-ile of baseline, or 130% of upstream control station's SS at the same tide of the same day and specific sensitive receiver water quality requirements

Turbidity (Tby) in NTU

(depth-averaged)

95%-ile of baseline data or 120% of upstream control station's Tby at the same tide of the same day

99%-ile of baseline or 130% of upstream control station's Tby at the same tide of the same day

 

Table 64          Event and Action Plan for Water Quality Monitoring

EVENT

ACTION

ET

IC(E)

ER

CONTRACTOR

ACTION LEVEL

Action level being exceeded by one sampling day

1.  Repeat in situ measurement to confirm findings;

2.  Repeat in situ measurement to confirm findings;

3.  Identify source(s) of impact;

4.  Inform IC(E), contractor and ER;

5.  Check monitoring data, all plant, equipment and Contractor’s working methods;

6.  Discuss mitigation measures with IC(E) and Contractor; and

7.  Repeat measurement on next day of exceedance.

1.  Discuss with ET and Contractor on the mitigation measures.  Review proposals on mitigation measures submitted by Contractor and advise the ER accordingly; and

2.  Assess the effectiveness of the implemented mitigation measures.

1. Discuss with IC(E) on the proposed mitigation measures; and

2. Make agreement on the mitigation measures to be implemented.

1. Inform the ER and confirm notification of the non-compliance in writing;

2. Rectify unacceptable practice;

3. Check all plant and equipment;

4. Consider changes of working methods;

5. Discuss with ET and IC(E) and propose mitigation measures to IC(E) and ER;

6. Implement the agreed mitigation measures.

Action level being exceeded by two or more consecutive sampling days

 

1.  Repeat in-situ measurement to confirm findings;

2. Identify source(s) of impact;

3. Inform IC(E), contractor;

4.  Check monitoring data, all plant, equipment and Contractor’s working methods;

5. Discuss mitigation measures with IC(E), ER  and Contractor;

6. Ensure mitigation measures are implemented;

7. Prepare to increase the monitoring frequency to daily;

8. Repeat measurement on next day of exceedance.

1. Discuss with ET and Contractor on the mitigation measures.  Review proposals on mitigation measures submitted by Contractor and advise the ER accordingly; and

2. Assess the effectiveness of the implemented mitigation measures.

1. Discuss with IC(E) on the proposed mitigation measures; and

2. Make agreement on the mitigation measures to be implemented.

3. Assess the effectiveness of the implemented mitigation measures.

 

1. Inform the Engineer and confirm notification of the non-compliance in writing;

2. Rectify unacceptable practice;

3. Check all plant and equipment and

4. Consider changes of working methods;

5. Discuss with ET and IC(E) and propose mitigation measures to IC(E) and ER within 3 working days;

6. Implement the agreed mitigation measures.

 

 

EVENT

ACTION

ET

IC(E)

ER

CONTRACTOR

LIMIT LEVEL

Limit level being exceeded by one sampling day

 

1.  Repeat measurement on next of exceedance to confirm findings;

2.  Identify source(s) of impact;

3.  Inform IC(E), contractor, ER and EPD;

4.  Check monitoring data, all plant, equipment and Contractor’s working methods;

5.  Discuss mitigation measures with IC(E), ER and Contractor;

1.  Check monitoring data submitted by ET and Contractor’s working methods;

2.  Discuss with ET and Contractor on  possible mitigation measures; and

3.  Review the proposed mitigation measures submitted by Contractor and advise the ER accordingly.

1.  Confirm receipt of notification of failure in writing;

2.  Discuss with IC(E), ET and Contractor on the proposed mitigation;

3.  Request Contractor to view the working methods; and

4.  Ensure mitigation measures are properly implemented.

1. Inform the ER and confirm notification of the non-compliance in writing;

2. Rectify unacceptable practice;

3. Check all plant and equipment and consider changes of working methods;

4. Discuss with ET, IC(E) and ER and propose mitigation measures to ER and IC(E) within 3 working days; and

5. Implement the agreed mitigation measures.

Limit level being exceeded by two or more consecutive sampling days

1.  Repeat measurement on next of exceedance to confirm findings;

2.  Identify source(s) of impact;

3.  Inform IC(E), contractor, ER and EPD;

4.  Check monitoring data, all plant, equipment and Contractor’s working methods;

5.  Discuss mitigation measures with IC(E), ER and Contractor;

6.  Ensure mitigation measures are implemented; and

7.  Increase the monitoring frequency to daily until no exceedance of Limit level for two consecutive days.

1.  Check monitoring data submitted by ET and Contractor’s working methods.

2.  Discuss with ET and Contractor on possible mitigation measures;

3.  Review the proposed mitigation measures submitted by Contractor and advise the ER accordingly; and

4.  Supervise the implementation of mitigation measures.

1.  Discuss with IC(E), ET and Contractor on the proposed mitigation measures;

2.  Request Contractor to critically review the working methods;

3.  Make agreement on the mitigation measures to be implemented;

4.  Ensure mitigation measures are properly implemented; and

5.  Consider and instruct, if necessary, the Contractor to slow down or to stop all or part of the construction activities until no exceedance of Limit level.

1. Take immediate action to avoid further exceedance

2. Discuss with ET, IC(E) and ER and propose mitigation measures to ER and IC(E) within 3 working days;

3. Implement the agreed mitigation measures;

4. Resubmit proposals of mitigation measures if problem still not under control; and

5. As directed by the Engineer, to slow down or to stop all or part of the construction activities until no exceedance of Limit level.

 

 

6.9       Control/ Mitigation Measures Addressing Water Quality Impact

6.9.1            The EIA report has recommended mitigation measures during the construction and operational phases of the Project.  The implementation schedule for the recommended mitigation measures is presented in Appendix I.

 

Construction Phase

6.9.2            Control of potential water quality impact arising from the construction works shall be implemented based on the following principles:

·          Minimisation of runoff;

·          Prevention or minimisation of the likelihood of the identified pollutants being in contact with rainfall or runoff; and

·          Measures to abate pollutants in the stormwater runoff.

 

6.9.3            Surface runoff and pollutant could be minimised by scheduling the foundation and WNR construction works during the dry seasons only (i.e. from December to April of the next year). During the dry seasons, the fishponds will have maximum spare capacity to allow temporary storage of pond water during re-profiling of the WNR so as to avoid the discharge of pond water. The Contractor should make best use of existing ponds for the purpose of temporary storage during bunds removal and realignment upon the construction of WNR. In addition, stormwater runoff will be reduced to minimum.

6.9.4            Besides, the Best Management Practices (BMPs) will be implemented in controlling water pollution during the construction phase. The guidelines for handling and disposal of construction site discharges as detailed in EPD’s ProPECC Note PN1/94 “Construction Site Drainage” will be followed. The water pollution control measures that are considered most relevant to this Project are listed below which should be implemented by the Contractor during the execution of the site formation and road works, where practicable:

Runoff from Construction Site

1.            High loading of suspended solids (SS) in construction site runoff shall be prevented through proper site management by the Contractor;

2.            The boundary of critical work areas shall be surrounded by ditches or embankment.  Accidental release of soil or refuse into the adjoining land should be prevented by the provision of site hoarding or earth bunds, etc. at the site boundary.  These facilities should be constructed in advance of site formation works and roadworks;

3.            Consideration should be given to plan construction activities to allow the use of natural topography of the site as a barrier to minimise uncontrolled non-point source discharge of construction site runoff;

4.            Temporary ditches, earth bunds should be provided to facilitate directed and controlled discharge of runoff into storm drains via sand/ silt removal facilities such as sand traps, silt traps and sediment retention basin.  Oil and grease removal facilities should also be provided where appropriate, for example, in area near plant workshop/ maintenance areas;

5.            Sand and silt removal facilities, channels and manholes should be maintained and the deposited silt and grit should be removed regularly by the contractor, and at the onset of and after each rainstorm to ensure that these facilities area functioning properly;

6.            Slope exposure should be minimised where practicable especially during the wet season. Exposed soil surfaces should be protected from rainfall through covering temporarily exposed slope surfaces or stockpiles with tarpaulin or the like;

7.            Access roads should be protected by crushed rock, gravel or other granular materials to minimise discharge of contaminated runoff;

8.            Slow down water run-off flowing across exposed soil surfaces;

9.            Plant workshop/ maintenance areas should be bunded and constructed on a hard standing. Sediment traps and oil interceptors should be provided at appropriate locations;

10.         Manholes (including newly constructed ones) should be adequately covered or temporarily sealed so as to prevent silt, construction materials or debris from getting into the drainage system;

11.         Construction works should be programmed to minimise soil excavation works where practicable during rainy conditions;

12.         Chemical stores should be contained (bunded) to prevent any spills from contact with water bodies.  All fuel tanks and/ or storage areas should provided with locks and be sited on hard surface;

13.         Chemical waste arising from the site should be properly stored, handled, treated and disposed of in compliance with the requirements stipulated under the Waste Disposal (Chemical Waste) (General) Regulation;

14.         Drainage facilities must be adequate for the controlled release of storm flows.

15.         Dredged materials requiring temporary storage on-site (for filling of marshland afterwards) should be securely stored and covered, if possible. Dried up mud materials can then be used for marshland formation.

Wastewater from Construction Site

1.            Sewage generated from the construction workforce should be contained in chemical toilets before connection to public foul sewer can be provided.  Chemical toilets should be provided at a minimum rate of about 1 per 50 workers. The facility should be serviced and cleaned by a specialist contractor at regular intervals;

2.            Foul water from canteens should also be contained by chemical toilets before connection to public foul sewer can be provided;

3.            Vehicle wheel washing facilities should be provided at the site exit such that mud, debris, etc. deposited onto the vehicle wheels or body can be washed off before the vehicles are leaving the site area;

4.            Section of the road between the wheel washing bay and the public road should be paved with backfill to reduce vehicle tracking of soil and to prevent site run-off from entering public road drains;

5.            Bentonite slurries used in diaphragm wall and bore-pile construction, etc. should be reconditioned and reused as far as practicable.  Spent bentonite should be kept in a separate slurry collection system for disposal at a marine spoil grounds subject to obtaining a marine dumping licence from EPD.  If used bentonite slurry is to be disposed of through public drainage system, it should be treated to meet the respective applicable effluent standards for discharges into sewers, storm drains or the receiving waters.

Oils and Solvents

1.            Spillage of fuel oils or other polluting fluids should be prevented at source.  It is recommended that all stocks should be stored inside proper containers and sited on sealed areas, preferably surrounded by bunds.

Draining of Fishpond Water

1.            Through transferring the pond water within the subject site, the need of discharging pond water into the surrounding water bodies during the construction of the Project can be minimized.

2.            Any draining of fishpond water should be handled with prudence. Water quality should be checked and monitored to ensure that relevant water quality criteria can be complied with the requirements as stipulated in the EM&A programme.

3.            Sedimentation tanks should be set up at the construction site so that water to be discharged can be retained for sedimentation if any discharging activity is considered necessary.

 

Operational Phase

6.9.5            The project proponent or the developer shall be responsible for the following measures:

Residential Development and Access Road

6.9.6            All domestic sewage generated will be discharged to the public sewerage. The drainage system will be designed to avoid any case of flooding based on the 1 in 50 years scenario with provision of treatment facilities including sand traps and oil interceptors. Temporary buffer containers should be provided to retain wastewater in case emergency discharge from sewage pump houses and sewer bursting discharge occur as a contingency measure.

6.9.7            Regular cleaning and sweeping of the access road and other paved areas are suggested so as to minimise exposure of pollutants to stormwater. Stormwater gullies and ditches provided along the access road and among the residential development will be regularly inspected.

6.9.8            Planter strips are provided along the access road and around the residential development where practicable. In the event of emergency (e.g. car accident) where there is a major spillage of oil, chemical or fuel, dispersants or fire fighting foam, etc., a system of contaminant bunding is recommended as far as practicable.

Wetland Nature Reserve

6.9.9            Best management practice will be adopted for the maintenance of the wetland and fishpond areas. Regular maintenance of fishponds will be exercised to remove excessive nutrients. Fish species will be carefully selected and the quantity will be controlled to avoid excessive fish farming as usually happened before the development of the Project.

6.9.10         A Wetland Nature Reserve management plan has been devised. No application of herbicides, or pesticides is considered necessary. Re-circulation pumping system will be provided for circulation of water between ponds and in turn to reduce the likelihood of overflowing of ponds due to even distribution of water volume.

6.9.11         Fishponds in the WNR will be self-contained. During normal operation, under the management of conservation manager, pond water will only be transferred within the WNR and the likelihood of pond water discharge will be minimal.

6.9.12         The temporary storage of water at the storage pond can allow sedimentation and removal of pollutants before discharge. It is particularly useful prior to wet season as cleaner water will be discharged to allow spare capacity for rainstorm.

6.9.13         The way to avoid overflow by intentional discharge upon the water quality, for example, is also recommended. Reed bed and alike can be provided in the marshland area to reduce nutrient discharge.

Mitigation Implementation Schedule

6.9.14         The implementation schedules of mitigation measures for water quality control during construction and operational phases are presented in Appendix I.

6.9.15         The effectiveness of these water quality control measures shall be checked by the EM&A requirements recommended in the above section.  If the above measures are not sufficient to restore the water quality to an acceptable levels, the Contractor (during construction) or the project proponent (during operational phase) shall liaise with the ET Leader, propose to ER, and IC(E) for approval, on the implementation of some other mitigation measures.


7.                  Construction Waste Management

7.1       Introduction

7.1.1            The Contractor is responsible for proper handling of construction and demolition material (C&DM), chemical waste and general refuse within the construction site, for disposal offsite, and to implement measures to minimise waste generation.

 

7.2       Mitigation Measures

7.2.1            The overall construction management strategy shall be minimisation of waste generation, coupled with maximum reuse and recycling of construction and demolition materials onsite or offsite as far as practicable.  Contract requirements should include the responsibilities of the Contractor for waste collection and disposal.  The following measures are recommended at this planning stage for proper handling of waste material during the construction phase.

Waste Management Plan

7.2.2            To ensure the appropriate handling of the C&DM, it is recommended that a Waste Management Plan (WMP) shall be proposed by the Contractor at the commencement of the construction works. The WMP should be developed taking into account the recommended control measures given in the EIA Report for the Project, which are summarised below.  The WMP shall be submitted to the Engineer at the commencement of the Project for approval and submission to EPD as per the requirement of the Environmental Permit.

Overall Waste Management

7.2.3            Storage areas for different waste types - different types of waste should be segregated and stored in different containers, skips or stockpiles to enhance reuse or recycling of materials and their proper disposal.  An on-site temporary storage area equipped with required control measures (e.g. dust) should be provided;

7.2.4            Trip-ticket system - in order to monitor the disposal of inert C&DM at public filling facilities and the remaining C&D waste to landfills, and control fly-topping, a trip-ticket system should be included as a contractual requirements and audited by the Environmental Team;

7.2.5            Records of Wastes - a recording system for the amount of wastes generated, recycled and disposed (including the disposal sites) should be proposed;

7.2.6            Training - training should be provided to workers in respect of site cleanliness and appropriate waste management procedure, including waste reduction, reuse and recycling, and avoid contamination of reusable C&DM.

Construction & Demolition Material

7.2.7            “Selective demolition” approach is recommended to facilitate to avoid the mixing of reusable/ recyclable material with the waste requiring disposal;

7.2.8            Construction waste such as used wood from framework, surplus concrete, etc. is not expected to be in large quantity due to the nature of the roadwork;

7.2.9            Generation of surplus construction material is recommended to be minimised by the Contractor through careful design, planning, good site management, control of ordering procedures, segregation and reuse of material;

7.2.10         Maximise the reuse opportunities of excavated material onsite;

7.2.11         Proper disposal of inert excavated material offsite to public filling areas.

Chemical Waste

7.2.12         Chemical material generated shall be recycled/ reused onsite/ offsite as far as practicable;

7.2.13         Chemical waste requiring disposal shall be handled, collected and delivered to the Tsing Yi Chemical Waste Treatment Facility in accordance with the Waste Disposal (Chemical Waste) (General) Regulation.

General Refuse

7.2.14         General refuse shall be properly handled, collected and disposed of to avoid cross contamination and minimise potential odour, pest and litter impacts.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


8.                    Landscape and Visual

8.1       Introduction

8.1.1           The EIA has recommended the EM&A for landscape and visual resources is undertaken during the design, construction and operational phases of the project.   The design, implementation and maintenance of landscape mitigation measures is a key aspect of this and should be checked to ensure that they are fully realised and that potential conflicts between the proposed landscape measures and any other project works and operational requirements are resolved at the earliest possible date and without compromise to the intention of the mitigation measures.  In addition, implementation of the mitigation measures recommended by the EIA will be monitored through the site audit programme.

8.2       Mitigation Measures

8.2.1            The Landscape and Visual Assessment of the EIA recommended a series of mitigation measures for both the construction and operation phases to ameliorate the landscape and visual impacts of the Project.  These measures include the following as shown in Table 8‑1 and Table 8‑2, which are also summarised in the environmental mitigation implementation schedules provided in Appendix I:

 

Table 81                    Proposed Construction Stage Mitigation Measures

Mit. Code

Mitigation Measure

CP1

 

Preservation of Existing Vegetation - The development proposals would avoid disturbance to the existing trees as far as practicable within the confines of both the development site, Southern Development Access and the proposed Wetland Nature Reserve (WNR). It is recommended that a full tree survey and felling application will be undertaken and submitted for approval by the relevant government departments in accordance with WBTC No. 03/2006, Management and Maintenance of Natural Vegetation and Landscape Works, and Tree Preservation during the detailed design phase of the project. Where possible all trees which are not in conflict with the proposals would be retained and shall be protected by means of fencing where appropriate to prevent potential damage to tree canopies and root zones from vehicles and storage of materials. Specifications for the protection of existing trees will be circulated for approval by the relevant government authorities during the preparation of the detailed tree survey.

CP2

 

Preservation of Existing Topsoil  - Topsoil disturbed during the construction phase will be tested using a standard soil testing methodology and where it is found to be worthy of retention stored for re-use. The soil will be stockpiled to a maximum height of 2m and will be either temporarily vegetated with hydroseeded grass during construction or covered with a waterproof covering to prevent erosion. The stockpile should be turned over on a regular basis to avoid acidification and the degradation of the organic material, and reused after completion. Alternatively, if this is not practicable, it should be considered for use elsewhere, including other projects.

CP3

 

Development Site and Temporary Works Areas - The landscape of these works areas would be restored following the completion of the construction phase. Construction site controls shall be enforced, where possible, to ensure that the landscape and visual impacts arising from the construction phase activities are minimised including the storage of materials, the location and appearance of site accommodation and the careful design of site lighting to prevent light spillage. Screen hoarding may not be a practicable for this project due to the viewing distances involved and the elevated viewing position of the majority of VSRs.

CP4

 

Mitigation Planting - Replanting of disturbed vegetation should be undertaken at the earliest possible stage of the construction phase of the project and this should use predominantly native plant species. All imported plants should be quarantined in local nursery for a minimum of 1 month to check there are no symptoms of infection by pests or diseases prior to planting on site. It is proposed that the origin of the trees be established through site visits to the nursery. In addition, certain trees will be brought to a temporary holding nursery at a small size as early in the construction period as possible and grown to the semi-mature size required as part of the proposed mitigation planting. This nursery will be located either on site or within the local area.

CP5

 

Transplantation of Existing Trees - Existing trees to be transplanted as shown in the Landscape Master Plan (approximately 28 trees), final recipient site will subject to the findings of the detailed tree survey and felling application undertaken at the detailed design stage

 

Table 82                    Proposed Operational Stage Mitigation Measures

Mit. Code

Mitigation Measure

OP1

 

Design of Built Development - the proposed residential development will incorporate design features including:

·        Stepped building height principle – The proposed residential blocks for Option 1A will range in height from 14 to 18 floors fronted by low-rise buildings in order to provide a greater sense of visual integration with the existing landscape context and mirror the form of the existing landform particularly the ridgeline to the south of the development site. The proposed built form will also provide a more visually interesting architectural form contrasting with the abrupt nature of the existing development associated with Tin Shui Wai. Whereas Option 1B will adopt a common height (15 storeys) for the blocks which will also be fronted by low-rise buildings which also serve to enhance the development’s visual integration.

·        Building massing and permeable development facade - the proposed use of slightly higher building blocks for Option 1A has allowed the incorporation of significant view corridors and the creation of voids in the façade of each of the blocks allowing views through the development to the green backdrop formed by the wooded hillsides to the south. These view corridors and viods within the façade of each block also allow the development to avoid the walling effect evident in the existing developments to the south and west particularly when viewed from locations such as the development in the northern part of Tin Shui Wai. The adoption of a slightly lower building height for Option 1B will require the introduction of one additional block and a subsequent reduction in the width of the proposed view corridors.

·        Maintenance of existing ridgeline and green backdrop – the proposed development form allows the maintenance of the existing ridgeline and green backdrop to the south of the development site even in relatively close views. This is achieved in Options 1A and 1B through a combination of the building heights and the creation of the view corridors.

·        Colour treatment of building facades - the architectural design for both Option 1A and 1B seeks to reduce the apparent visual mass of the development further through the use of colour blocking utilising range of visually recessive earth colours and tones on the facades of the different blocks.

·        Underground car parking - the proposed development for Options 1A and 1B  will utilise underground car parking in order to maximise the area available for landscaping and minimise potential impacts of extensive hard surfaced areas in elevated views both within and without the development site.

·        Responsive building finishes - In terms of the building finishes for Options 1A and 1B natural tones should be considered for the colour palette with non-reflective finishes are recommended on the outward facing building facades to reduce glare effect. 

·        Responsive lighting design – Aesthetic design of architectural and road lighting with following glare design measures:

-         Directional and full cut off lighting is recommended particularly for recreation and roadside areas to minimise light spillage to the surrounding areas.

-         Minimise geographical spread of lighting, only applied for safety at the key access points and staircases;

-         Limited lighting intensity to meet the minimum safety and operation requirement; and

-         High pressure sodium road lighting is recommended for more stringent light control reducing spillage and thus visual impacts.

 

OP2

 

Landscape Buffer Planting – According to the guidelines provided in the Final Report of the Fish Pond Study at Deep Bay Area, the buffer area will extend around the periphery of the development to the proposed marsh habitat in WNR providing screening of the development at low levels and creating a transitional structure, not less than 50m wide, between the low-lying fishponds of the WNR and the upright forms of the proposed built development. This planting in addition to the proposed bamboo planting proposed as part of the ecological mitigation measures will also serve to visually integrate the proposals into the existing landscape framework.  The buffer will utilise native tree species to link where possible to the existing wooded areas with the advantage of creating a more coherent landscape framework whilst also improving the ecological connectivity between existing woodland habitats. A woodland management programme will be employed during the operational phase of the project with the objective of conserving and enhancing the ecological interest (approximate area 3750 square metres equating to 750 trees at 2.5m planting centres).

Apart from the landscape buffer planting, some limited tree clusters will be planted on bunds within the WNR to facilitate the establishment of habitat for different bird species. The primary objective of the tree planting within the WNR will be ecological in the creation of a favourable habitat for birds rather than for amenity purposes. As such within the fishpond or freshwater marshland area, trees will be planted in small clusters in positions designed not to intrude upon the bird flight lines, create enclosure or shade the marshland and fishponds. Some fruit-bearing trees, such as Ficus hispida, Ficus microcarpa and Melia azedarach, are recommended from ecological perspectives to enhance foraging opportunities for some bird species.  Whilst wide canopied tree species such as Ficus microcarpa in combination with bamboo species such as Bambusa eutuldoides are recommended to be planted at the edge of the alternative egretry I in order to provide a favourable habitat for the egrets and screen the area from human activity.  

 

OP3

Landscape Strategy for the Design of Amenity Space - The proposals are described in detail below (approximate area 3.4 ha).

OP4

Compensatory Planting Proposals - the planting proposals for the residential amenity areas and landscape woodland buffer areas presented as Figure 11-12, Landscape Master Plan include some 300 new specimen trees in addition to the 3750 square metres of mass woodland planting described under OP2 above would be established within the project boundary. The proposed planting of some 1050 trees will result in a compensatory planting ratio of 2.6:1 (new tree planting: trees recommended for felling). This compares favourably with the report's assertion that some 399 trees would be felled due to the proposals in this area. Following the retention of existing trees, the successful establishment of newly planted trees and the transplantation of some of the existing trees, the project area will contain approximately 1316 trees. Trees forming part of the landscape buffer area will utilise species native to Hong Kong while the species selection for the areas within the development site will respond to the landscape concept for the area. These proposals will be subject to the detailed design stage of the project.

OP5

Southern Development Access – the landscape of the road corridor will be restored to its existing condition following the completion of the road enhancement works.

 

8.3            Design Phase Audit

8.3.1        The landscape measures proposed within the EIA to mitigate the landscape and visual impacts of the scheme should be embodied into the detailed landscape design drawings and contract documents including the protection of existing trees where possible, the transplanting of existing trees and the planting of new trees and shrubs.  Designs should be checked to ensure that the measures are fully incorporated and that potential conflicts with building, civil engineering, geo-technical, structural, lighting, signage, drainage, underground utility and operational requirements are resolved prior to construction.

8.3.2        The design phase EM&A requirements for landscape and visual resources comprise the audit of the detailed landscaping and visual specifications to be prepared during the detailed design together with ensuring that the design is sensitive to landscape and visual impacts and that landscape resources are retained as far as practicable.  Monitoring of design works against the recommendations of the landscape and visual impact assessments within the EIA should be undertaken as and when the designs are produced to ensure that they fulfil the intentions of the mitigation measures.

8.3.3       The landscape and visual auditor shall review the designs as and when they are prepared and liaise with the landscape architect and design engineer to ensure all measures have been incorporated in the design in a format that can be specified to the Contractor for implementation. In the event of a non conformity, the Event/Action plan as detailed in Table 8‑3 below should be followed.

 Table 83                     Event / Action Plan for Design Phase

Action Level

Landscape and Visual Auditor

Project Architect (PA)/ Project Engineer (PE)

Project Landscape Architect (PLA)

Non Conformity (with Design Standards and Specification)

1.   Identify Source;

2.   Inform PA, PE and PLA;

3.   Discuss remedial actions with PA,PE, PLA; and

4.   Verify remedial actions when complete.

 

1.   Amend building or engineering designs;

2.   Notify PLA;

3.   Discuss remedial actions with PLA; and