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Currently, around 5 million tonnes of waste are disposed of each year at the three strategic landfills in Hong Kong, including the West New Territories (WENT) Landfill, the South East New Territories (SENT) Landfill, and the North East New Territories (NENT) Landfill.

In order to maintain the continuity of landfill capacity for disposal of wastes, the Director of Environmental Protection commissioned a study CE45/99 on “Extension of Existing Landfills and Identification of Potential New Waste Disposal Sites” in 2000. The Study (CE45/99) was completed in early 2003 and proposed a Strategic Plan for the development of landfill extension and new sites for the disposal of solid wastes in the next 50 years.

The WENT Landfill Extension forms an integral part in the Strategic Plan in maintaining the continuity of landfill capacity in the West New Territories. The project is to develop the WENT Landfill Extension (about 200 hectares with capacity of 81Mm³) next to the existing WENT Landfill.

The eastern part of the site is located in Tsang Kok Valley which is a hilly terrain site sparsely vegetated with grass and limited patched of shrubs. The easterly ridge forms a boundary with the existing WENT Landfill. The northern part is the CLP Tsang Tsui Ash Lagoons and the former BBC Relay Station. The southern area is bounded by the natural topography, with ridgelines rising southwards from the coastline to meet the major east-west trending ridgeline at about +290mPD. The southern part of the site will also encroach onto the Tsing Shan Firing Range.

The location plan of the WENT Landfill Extension site is shown on Figure 1.1.

1.2 Purpose and Scope of this Manual

Environmental Monitoring and Audit (EM&A) is an important aspect in the EIA process which specifies the timeframe and responsibilities for the implementation of environmental mitigation measures. The requirements on environmental monitoring (including baseline and impact monitoring) are given in the EM&A Manual (the Manual) which is a supplementary document to the EIA Study for the Project and prepared in accordance with the requirements in the EIA Study Brief and Technical Memorandum on Environmental Impact Assessment Process (TM-EIAO).

The purpose of this EM&A Manual is to guide the establishment of an EM&A programme to ensure compliance with the EIA recommendations, to assess the effectiveness of recommended mitigation measures, and to identify further need for additional mitigation measures or remedial action.

This Manual outlines the monitoring and audit requirements for the construction, operation, restoration and aftercare stages of the WENT Landfill Extension. It aims to provide systematic procedures for monitoring, auditing and minimising environmental impacts associated with construction works and operation activities.

Hong Kong environmental regulations and the Hong Kong Planning Standards and Guidelines have served as environmental standards and guidelines in the preparation of this Manual. This EM&A Manual was prepared in accordance with the requirements as stipulated in Annex 21 of the TM-EIAO.

This Manual contains the following information:

· Organisation, hierarchy and responsibilities of the DBO Contractor, Environmental Team (ET), Independent Environmental Checker (IEC), and Independent Consultant (IC), with respect to the EM&A requirements during the construction, operation, restoration and aftercare phases of WENT Landfill Extension;

· Information on project organisation and programming of construction activities;

· Requirements with respect to the construction schedule and necessary EM&A programme to track the varying environmental impacts;

· Full details of methodologies to be adopted, including all field, laboratory and analytical procedures, and details on quality assurance;

· Procedure for undertaking on-site environmental audits;

· Definition of Action and Limit Levels;

· Establishment of Event and Action Plans;

· Requirements of reviewing pollution sources and working procedures required in the event of non-compliance of environmental criteria and complaints;

· Requirements for reviewing the EIA predictions, implementation of mitigation measures, and effectiveness of environmental protection and pollution control measures adopted; and

· Presentation of requirements for EM&A data and appropriate reporting procedures.

1.3 Description of the Project

1.3.1 General Description of the Project

The development of the WENT Landfill Extension will involve the following works:

· Site formation, drainage diversion and preparation;

· Installation of liner system;

· Installation of leachate collection, treatment and disposal facilities;

· Installation of gas collection, utilization and management facilities;

· Operation and environmental monitoring of landfill;

· Restoration and aftercare.

1.3.2 Key Project Requirements

The key project requirements for the WENT Landfill Extension are:

· Development of a landfill that covers an area of about 200ha with an estimated void space of 81Mm³;

· Provision of liner system for the landfill to prevent contamination of land and water resources;

· Provision of leachate collection, treatment and disposal facilities with sufficient capacity for handling the leachate arising from the new landfill;

· Provision of landfill gas (LFG) collection, utilisation and management facilities;

· Provision of utilities, drainage and road network necessary for the proper operation of the Project;

· Provision of facilities (both civil works and electrical and mechanical equipment) for waste reception, inspection, charging, handling and compaction, and plant maintenance;

· Provision of facilities for site administration;

· Operation of landfill in compliance with all relevant engineering, geotechnical and environmental standards;

· Restoration of landfill in compliance with all relevant engineering, geotechnical and environmental standards;

· Provision of aftercare for the landfill for a period of about 30 years

· Carrying out environmental monitoring and audits throughout construction, operation, restoration and aftercare of the landfill; and

· Implementation of environmental measures necessary for the protection of the surrounding environment.

1.3.3 Size, Scale, Shape and Design of the Project

The landfill extension site is a bowl-shape area with a large void space in the middle for waste filling. The total site area is about 200 ha and the final height of the landfill would be about +290mPD.

The key design features are listed as follows:

· Bottom liner system - to separate rubbish and leachate from groundwater;

· Storm water drainage system - to collect surface runoff generated from the landfill;

· Leachate collection system - to collect liquid leaching from the waste mass and convey it to a on-site leachate treatment plant prior to discharging to downstream outfall chamber and Urmston Road Submarine Outfall;

· Landfill gas collection system - to collect gases formed during the decomposition of waste. These gases will be treated and utilised for production of electricity on-site;

· Covering and capping - to seal off the top of the landfill with a gas venting layer, an impermeable mineral layer, a drainage layer and top soil.

Various activities during construction, operation, restoration and aftercare of landfill are discussed in the following sub-sections.

1.3.4 Construction Phase and Activities

Simple excavation and slope formation works will be carried out during the construction stage. The permanent works comprise cut and fill earthworks, slope formation and earth wall construction. The temporary works will involve the formations of temporary ditches along the sides of excavations and associated drainage works, and material storage areas.

During site formation, sediment will be contained in permanent detention ponds/silt traps that will be constructed according to landfill phasing. Final design and location of sediment traps are yet to be decided, but are likely to be down gradient of each landfill phase. Where possible they will be maintained during the operation of each phase to ensure the effective control of operational soil erosion problem.

1.3.5 Operation Phase and Activities

During operation, waste will be disposed of at individual landfill cells. Deposited waste will be compacted to thin layers. The works will be maintained at a gradient of not greater than 1 in 3 to ensure the effectiveness of the compaction equipment. Daily cover (about 150mm if soil cover used) will be applied to control environmental nuisances such as windblown litter, odour, vermin, flies and birds.

Temporary cover (such as impermeable plastic sheets) will also be provided for inactive tipping phases. It helps to control environmental nuisances as well as to minimize the generation of leachate and high suspended solids runoff.

1.3.6 Restoration Phase and Activities

Restoration is a process to restore a landfill site to a condition suitable for afteruse.

After completion of waste filling, final capping will be applied to minimise infiltration of rainwater into the waste body thus reducing the amount of leachate generated. After placement of the final capping system, the areas will be landscaped. Vertical landfill gas extraction wells will be drilled during restoration. The restoration works will also include the construction of permanent surface water drains.

1.3.7 Aftercare Phase and Activities

Upon completion of site restoration, the period of aftercare will begin and last for 30 years. During the aftercare period, by-products from waste disposal will continue to be generated including leachate and landfill gas. The established leachate and landfill gas management control and treatment facilities will continue to operate throughout the aftercare period.

Regular site maintenance will be required during the aftercare period to keep the incorporated systems functioning as designed. Site monitoring during the aftercare period will continue in accordance with the monitoring plan, but may be decreased if warranted and approved by the EPD.

During the aftercare period, afteruse(s) could be developed on the restored landfill for beneficial uses. However, the scope and extent of the afteruse development is not yet determined at this stage, thus a separate feasibility study and environmental study will be carried out for the development of the afteruse(s) if required.

1.4 Project Programme

The WENT Landfill Extension will start receiving waste-deliveries only when the existing WENT Landfill ceases operation. The timing of this has yet to be determined, depending on the rate of waste-deliveries in the forthcoming period. As a preliminary prediction, the capacity of the existing WENT Landfill will probably have its capacity run out by end 2018, by which time the Landfill Extension shall start operation.

The site formation will be divided into six phases. A tentative outline programme for implementation of the WENT Landfill Extension is shown in Appendix A. Table 1.1 below summaries the estimated implementation period for each phase of the WENT Landfill Extension. The stated period includes site clearance, site formation and site preparation works as mentioned above.

Table 1.1 Implementation Programme for WENT Landfill Extension

Phases	Construction	Operation	Completion
1	Yr 2016	Yr 2018	Yr 2028
2	Yr 2017	Yr 2019	Yr 2028
3	Yr 2018	Yr 2020	Yr 2028
4	Yr 2020	Yr 2022	Yr 2028
5	Yr 2021	Yr 2023	Yr 2028
6	Yr 2022	Yr 2024	Yr 2028

Nevertheless, the exact timing of the various activities may vary, depending on actual volume of waste to be delivered in the forthcoming years.

It is anticipated that the DBO (Design-Build-Operate) contract form, which has hitherto worked well for the existing waste management contracts (notably the three strategic landfill contracts and the refuse transfer station contracts), will be adopted for WENT Landfill Extension. Detailed design and formulation of technical details for the construction, operation, restoration and aftercare of the WENT Landfill Extension will be carried out by the DBO Contractor, in accordance with requirements stipulated in the Specification and other documents of the DBO Contract.

2 Scope of EM&A Programme

The requirements of EM&A programme should include the recommendations from the EIA study and with reference to EPD’s “Environmental Monitoring and Audit Guidelines for Development Projects in Hong Kong”. Detailed requirements of the EM&A programme for construction, operation, restoration and aftercare phases of this Project are described in the following sections of this EM&A Manual.

2.1 Objectives of EM&A Programme

The EM&A requirements recommended in the EIA Report will ensure compliance with the specified mitigation measures. An EM&A programme should be designed based on these requirements to achieve the following key objectives:

· Establishment of existing environmental setting of the site to assist the development of landfill design and to establish a baseline against which any adverse environmental impacts can be evaluated;

· Provision of a database against which any short- or long-term environmental impacts of the Project can be determined against the Project compliance with regulatory requirements, standards and Government policies;

· Verification of environmental impacts predicted in the EIA study and provision of an early indication of any failure of environmental control measures or practices to achieve the acceptable standards;

· Evaluation of environmental impacts during site preparation works and operation phases of the WENT Landfill Extension project to assist the determination of effectiveness of the mitigation measures to be implemented, ensure compliance with the relevant environmental regulations, and design of any additional mitigation measures requirements;

· Provision of information to enable environmental audit of Project activities during construction, operation, restoration and aftercare phases, and taking remedial action if unexpected problems or unacceptable impacts arise; and

· Provision of a basis for long-term monitoring programme following the completion of works during the aftercare phase.

2.2 Organisation for EM&A Programme

The line of communication and working relationship are shown in Appendix B, which consists of the Project Proponent (EPD/WFG), DBO Contractor, Environmental Team (ET), Independent Environmental Checker (IEC), and Independent Consultant (IC), etc. It should be established to take the responsibilities for environmental protection for this landfill extension project. The IEC will be appointed by the Project Proponent as part of the IC to conduct independent auditing of the overall EM&A programme including environmental and operation monitoring, implementation of mitigation measures, EM&A submissions, and any other submissions required under the Environmental Permit (EP). The individual responsibilities are:

DBO Contractor

· Employment of an ET to carry out environmental monitoring, laboratory analysis and reporting of environmental monitoring and audit;

· Submission of proposals of mitigation measures in case of exceedances of Action and Limit (A/L) Levels in accordance with the Event and Action Plan (EAP);

· Implementation of mitigation measures to reduce the impacts where A/L Levels are exceeded; and

· Adherence to the agreed procedures for carrying out complaint investigation.

· Setting up of all the required environmental monitoring stations;

· Monitoring of various environmental parameters as required;

· Analysis of monitoring and audit data and review the success of EM&A programme to cost-effectively confirm the adequacy of mitigation measures implemented and the validity of the EIA predictions and to identify any adverse environmental impacts arising;

· Carrying out site inspections to investigate and audit the DBO Contractor’s site practices, equipment and work methodologies with respect to pollution control and environmental mitigation, and take proactive actions to resolve problems;

· Auditing and preparation of audit reports on environmental monitoring data and site conditions;

· Reporting of environmental monitoring and audit results to the IEC, DBO Contractor, IC and Project Proponent or its delegated representative;

· Recommendation of suitable mitigation measures to the DBO Contractor in case exceedance of A/L Levels in accordance with the EAP;

· Undertaking of regular on-site audits/ inspections and reporting to the DBO Contractor and IC of any potential non-compliance; and

· Following up and closing out of non-compliance actions.

IEC

· Review of EM&A programme by the ET (at not less than monthly intervals);

· Auditing of monitoring activities and results (at not less than monthly intervals);

· Reporting of audit results to the IC and Project Proponent in parallel;

· Reviewing of EM&A reports (monthly, quarterly and annual summary reports) submitted by the ET;

· Reviewing of proposal of mitigation measures submitted by the DBO Contractor in accordance with the EAP;

· Checking of mitigation measures recommended in the EIA Report and EM&A Manual, and ensuring they are properly implemented in timely manner when required; and

· Reporting of findings of site inspections and other environmental performance reviews to IC and Project Proponent.

· Verification and checking DBO Contractor’s activities and ensure that the requirements in the EM&A Manual are fully complied with;

· Informing DBO Contractor when action is required to reduce impacts in accordance with the EAP; and

· Ensure compliance with the agreed EAP in case any exceedance.

Sufficient and suitably qualified professional and technical staff should be employed by the respective parties to ensure full compliance with their duties and responsibilities, as required under the EM&A programme for the duration of the Project.

2.3 Environmental Management Plan

A systematic Environmental Management Plan (EMP) should be developed and implemented by the DBO Contractor in accordance with the ETWB TC(W) 19/2005 Environmental Management on Construction Sites to ensure effective implementation of the mitigation measures, monitoring and remedial requirements presented in the EIA, EM&A and environmental mitigation implementation schedule (EMIS) (Appendix C). The IEC should audit the implementation status of EMP and advise the necessary remedial action as required. Such remedial actions should be enforced through contractual requirements. The EMP should be certified by the ET and verified by the IEC.

The EMP should require the DBO Contractor (and sub-contractors) and ET to define in details how to implement the recommended mitigation measures in order to achieve the environmental performance stipulated in the Hong Kong environmental legislation and EIA documents. The review of on-site environmental performance should be undertaken by IEC through a systematic checklist and audit once the construction commences. The environmental performance review programme comprises a regular assessment on the effectiveness of the EMP.

The EMP should summarise the requirements for the DBO Contractor to submit a Landfill Monitoring Plan (LMP) and an Emergency Response Plan (ERP) for approval. The LMP should describe the procedures and provide details of the environmental monitoring programme for the DBO Contractor to carry out throughout the construction, operation, restoration and aftercare phases of the Project. The ERP should address various scenarios within WENT Landfill Extension, in particular in the event of leakage of LFG/ leachate, failure of LFG/ leachate treatment operation, fire, chemical/ DG spillage, etc.

If the DBO Contractor would adopt alternative construction methods or implementation schedules, the detailed modifications of methodology and equipment should be submitted to the ET Leader for certification and IEC for verification before submission to EPD for approval prior to the commencement of works. Any changes in construction methods should be indicated in the revised EMP. The DBO Contractor should review the EMIS with respect to the design developments and construction methodology. All necessary mitigation measures identified and recommended in the EIA study are summarised in the EMIS, which specifies the extent, locations, time frame and responsibilities for the implementation of the environmental mitigation measures identified.

2.4 Waste Management Plan

The DBO Contractor should develop the waste management requirements as part of the EMP in Section 2.3 above for the construction phase of the Project. The DBO Contractor should also prepare a Waste Management Plan (WMP) for the Project during the operation, restoration and aftercare phases. Where waste generation is unavoidable, any opportunities for recycling or reuse of the wastes should be maximised. If the wastes cannot be recycled, recommendations for appropriate disposal routes should be provided in the WMP. A method statement for stockpiling and transportation of the excavated materials and other construction wastes should also be included in the WMP and approved before the commencement of construction. All mitigation measures arising from the approved WMP should be fully implemented. The WMP should be certified by the ET and verified by IEC.

It is not anticipated that excavated C&D materials would require off-site disposal, as the excavated materials will be reused on site. Notwithstanding this, a trip-ticket system should be put in place in accordance with ETWB TC(W) No 31/2004. Copies/ counterfoils from trip-tickets (showing the quantities of C&D Materials taken off-site, if required) should be kept for record purposes.

For the purpose of enhancing the management of Construction and Demolition (C&D) materials including rock, and minimising its generation at source, construction would be undertaken in accordance with the Environment, Transport and Works Bureau Technical Circular (Works) No 33/2002 – Management of Construction and Demolition Material Including Rock, or its latest versions. The management measures stipulated in the Technical Circular should be incorporated.

2.5 Baseline Monitoring

Prior to the commencement of construction works, the baseline conditions of environmental parameters should be established at designated monitoring locations to determine the nature and ranges of natural variation and to demonstrate the suitability of the proposed impact, control and reference monitoring locations in the EM&A programme. The baseline conditions of the following environmental parameters should be established by the ET, including air quality (dust, organic emissions, odour), noise, water quality (groundwater and surface water), ecology (vegetation and biodiversity), landscape and visual, and cultural heritage.

2.6 Impact Monitoring

During the implementation of the Project, environmental monitoring should be conducted at designated monitoring locations to detect the changes of environmental parameters attributed to the Project. Impact monitoring should be conducted during all phases of the Project. The environmental monitoring parameters during construction phase should include air quality (dust, organic emissions, odour), noise, water quality (groundwater and surface water), ecology (vegetation and biodiversity), landscape and visual, and cultural heritage. The monitoring during operation, restoration and aftercare phases should include all parameters of construction phase, in addition to leachate, LFG and PFA hazard.

2.7 Compliance with Action and Limit Levels

The A/L Levels should be defined for environmental monitoring at designated monitoring locations exceeding which a prescribed response should be required. Individual A/L Levels should be quantitatively defined for the respective environmental monitoring parameters according to the following basic principles:

2.7.1 Action Level

Action Levels indicate deteriorating ambient environmental quality potentially due to the Project implementation. It acts as a sign to trigger appropriate remedial actions in order to rectify any mal-practices or non-conformance of Project activities thereby preventing the deterioration of environmental quality and to resume the ambient environmental quality back to normal levels.

2.7.2 Limit Level

Limit Levels are the statutory and/or contractual levels below which environmental conditions are considered unacceptable. If Limit Levels were exceeded, the relevant part of the works should not be continued without implementation of immediate remedial action, including a critical review of plant and working methods.

2.8 Event and Action Plan

The EAP should lay down the systematic procedures for implementation in case exceedance of A/L Levels and environmental complaints in order to timely address, investigate and resolve such incidents and minimise their recurrence. The EAP should define the action under specific conditions, i.e. exceedance of A/L Levels, and trigger the relevant parties in the EM&A programme to take the action.

2.9 Environmental Audit

Environmental audit should include the following components:

· Regular inspection of site practices should be conducted to assess and ensure the environmental protection and pollution control measures to be in accordance with the EIA recommendations and complied with contract specifications.

· Examination of all available information related to the investigation of the nature and cause of actual, potential and cumulative environmental impacts and complaints/ queries;

· Proposal for remedial measures for resolution of impacts, effective implementation of proposed mitigation measures, documentation and summary of audit findings, and liaison and consultation with the public and concerned parties on the effects of such remedial works; and

· Enquiries and complaints related to the environmental performance of the Project should be anticipated from individuals and organisations, which should be referred to the ET Leader for investigation and action. Systematic procedures for environmental complaints should be established and followed. During the complaint investigation, the DBO Contractor and IEC should facilitate the ET by providing all necessary information.

2.10 Reporting

2.10.1 Baseline Monitoring

Baseline Monitoring Report should be prepared by the ET and submitted within 4 weeks of completion of baseline monitoring to include all the baseline monitoring data and findings. The Report should be certified by the ET and verified by the IEC prior to submission to the EPD.

2.10.2 Impact Monitoring

Monthly EM&A Reports should be prepared by the ET and submitted within 21 days of each reporting month during construction, operation, restoration and aftercare phases to include all the impact monitoring data, findings and recommendations. Quarterly Summary, Annual Review and Final Review EM&A Reports should be prepared by the ET and submitted within 10 days of each reporting quarter, reporting year and cessation of project phase, respectively, during construction and operation, restoration and aftercare phases to include all the summary of monitoring trends, findings and recommendations. These reports should be certified by the ET and verified by the IEC prior to formal submission to the EPD.

2.11 Cessation of EM&A Programme

To implement the EM&A programme according to the Construction and Operation Phases, Restoration Phase and Aftercare Phase in which different EM&A requirements should be imposed, the ET and IEC should notify the EPD the completion of EM&A programme for the specific Project phases and request for agreement to cease the EM&A programme.

3 Air Quality Monitoring

3.1 Construction Dust

3.1.1 Air Quality Parameters

Monitoring of the Total Suspended Particulate (TSP) levels shall be carried out by the ET to ensure that any deteriorating air quality could be readily detected and timely action be taken to rectify the situation. 1-hour and 24-hour TSP levels should be measured to indicate the impacts of construction dust on air quality. The TSP levels shall be measured by following the standard high volume sampling method as set out in the Title 40 of the Code of Federal Regulations, USA, Chapter 1 (Part 50), Appendix B. Upon approval by the IEC, 1-hour TSP levels can 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.

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.

3.1.2 Monitoring Equipment

High volume sampler (HVS) in compliance with the following specifications shall be used for carrying out the 1-hr and 24-hr TSP monitoring:

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

· equipped with a timing/control device with +/- 5 minutes accuracy for 24 hours operation;

· installed with elapsed-time meter with +/- 2 minutes accuracy for 24 hours operation;

· capable of providing a minimum exposed area of 406 cm² (63 in² );

· flow control accuracy: +/- 2.5% deviation over 24-hr sampling period;

· equipped with a shelter to protect the filter and sampler;

· incorporated with an electronic mass flow rate controller or other equivalent devices;

· equipped with a flow recorder for continuous monitoring;

· provided with a peaked roof inlet;

· incorporated with a manometer;

· able to hold and seal the filter paper to the sampler housing at horizontal position;

· easy to change the filter; and

· capable of operating continuously for 24-hr period.

The ET Leader is responsible for provision of the monitoring equipment. He shall ensure that sufficient number of HVSs with an appropriate calibration kit are available for carrying out the baseline monitoring, regular impact monitoring and ad hoc monitoring. 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.

Initial calibration of dust monitoring equipment 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. All the data should be converted into standard temperature and pressure condition. 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.

If the ET Leader proposes to use a direct reading dust meter to measure 1-hr TSP levels, he shall submit sufficient information to the IC and IEC to prove that the instrument is capable of achieving a comparable result as that of the HVS and may be used for the 1-hr sampling. The instrument should 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.

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

· 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;

· the wind data should be captured by a data logger and to be downloaded for processing at least once a month;

· the wind data monitoring equipment should be re-calibrated at least once every six months; and

· wind direction should be divided into 16 sectors of 22.5 degrees each.

In exceptional situations, the ET Leader may propose alternative methods to obtain representative wind data upon approval from the IC and IEC, and agreement from EPD.

3.1.3 Laboratory Measurement/Analysis

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.

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 IC and IEC and the measurement procedures (first measurement) shall be witnessed by the IC and IEC. The ET Leader shall provide the IC and IEC with one copy of the Title 40 of the Code of Federal Regulations, Chapter 1 (Part 50), Appendix B for his reference.

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

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 a readout down to 0.1 mg. The balance shall be regularly calibrated against a traceable standard. All the collected samples shall be kept in a good condition for 6 months before disposal.

3.1.4 Monitoring Locations

The dust monitoring locations are shown in Figure 3.1. The status and locations of dust sensitive receivers may change after issuing this manual. If such cases exist, the ET Leader shall propose updated monitoring locations and seek approval from IC and IEC and agreement from EPD on the proposal.

The ET shall also write to the relevant private owners or owner’s incorporation for their agreement to install the HVS at suitable location at least 3 months before construction works. The purpose of monitoring (to minimize potential impact and to safeguard the residential) should be clearly stipulated. The specification, wiring, fixing, maintenance, communication and payment of electricity cost shall be detailed in the letter. If there is objection from the owner, alternative monitoring location at premises in the vicinity shall be identified and agreed with EPD, IEC and IC. The monitoring location is illustrated in Figure 3.1.

Table 3.1 Description of dust monitoring locations

AML ID	EIA ASR Ref	Location	Land Uses	Monitoring Parameters
AM(D)1	A1-1	Ha Pak Nai	Residential	1-hr and 24-hr TSP
AM(D)2	A1-2	Ha Pak Nai	Residential
AM(D)3	A1-3	Ha Pak Nai	Residential
AM(D)4	A2-1	Black Point Power Station (Office and Cotnrol Room)	Industrial
AM(D)5	A4-1	Lung Kwu Sheung Tan	Place of Worship

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

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

· Close to the sensitive receptors; and

· Account for the prevailing meteorological conditions.

The ET Leader shall agree with the IC and IEC on the position of the HVS 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 separation from walls, parapets and penthouses is required for rooftop samplers;

· a minimum of 2 metres 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 drip-line;

· 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.

3.1.5 Baseline Monitoring

The ET Leader shall carry out baseline monitoring at all of the designated monitoring locations for at least 14 consecutive days prior to the commencement of the construction works to obtain daily 24-hr TSP samples. 1-hour sampling shall also be done at least 3 times per day while the highest dust impact is expected. During the baseline monitoring, there should not be any construction or dust generation activities in the vicinity of the monitoring stations.

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 IC and IEC and agreed with EPD.

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

If the baseline level for air quality exceeds the limit level, the ET shall carry out an investigation to determine the cause of the exceedance in consultation with EPD. Regardless of whether the exceedance was caused by poor weather condition (e.g. high API) or as a result of inadequate control measures on construction activities being carried out on other nearby construction sites, a second set of baseline monitoring shall be conducted by the ET to determine an appropriate baseline level for the EM&A programme in agreement with EPD.

Ambient conditions may vary seasonally and shall be reviewed at every three months. 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 at times when the DBO Contractor's activities are not generating dust, at least in the proximity of the monitoring stations. 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 EPD.

3.1.6 Impact Monitoring

The ET Leader shall carry out impact monitoring during the course of the Works. For regular impact monitoring, the sampling frequency of at least once in every six-days, shall be strictly observed at all the monitoring stations for 24-hr TSP monitoring. For 1-hr TSP monitoring, the sampling frequency of at least three times in every six-days should be undertaken when the highest dust impact occurs. The specific time to start and stop the 24-hr TSP monitoring shall be clearly defined for each location and be strictly followed by the DBO Contractor.

In case of non-compliance with the dust criteria, more frequent monitoring exercise, as specified in the Action Plan in Section 3.1.7, 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.

An Environmental Monitoring Implementation Schedule (EMIS) of the recommended mitigation measures is presented in Appendix C1.

3.1.7 Event and Action

The baseline monitoring results form the basis for determining the air quality criteria for the impact monitoring. The ET Leader shall compare the impact monitoring results with air quality criteria set up for 24-hour TSP and 1-hour TSP. Table 3.2 shows the dust criteria, namely Action and Limit levels to be used. Should non-compliance of the air quality criteria occur, the ET, the IC/IEC and the DBO Contractor shall undertake the relevant action in accordance with the Action Plan in Table 3.3.

Table 3.2 Action and limit levels for dust impact

Parameters	Action	Limit
24-hour TSP Level in µg/m³	For baseline level 200 µg/m³, Action level = (130% of baseline level + Limit level)/2 For baseline level > 200 µg/m³, Action level = Limit level	260
1-hour TSP Level in µg/m³	For baseline level 384 µg/m³, Action level = (130% of baseline level + Limit level)/2 For baseline level > 384 µg/m³, Action level = Limit level	500

Parameters

Action

Limit

24-hour TSP Level in µg/m³

For baseline level 200 µg/m³, Action level = (130% of baseline level + Limit level)/2

For baseline level > 200 µg/m³, Action level = Limit level

260

1-hour TSP Level in µg/m³

For baseline level 384 µg/m³, Action level = (130% of baseline level + Limit level)/2

For baseline level > 384 µg/m³, Action level = Limit level

500

Table 3.3 Event/Action plan for dust impact

Event	ET	IEC	IC	DBO Contractor
Exceedance of Action Level
1. Exceedance for one sample	· Identify source · Inform IEC and DBO Contractor · Repeat measurement to confirm findings · Increase monitoring frequency to daily	· Check monitoring data and DBO Contractor's working methods	· Notify DBO Contractor for the identification of cause	· Rectify any unacceptable practice · Amend working methods if appropriate
2. Exceedance for two or more consecutive samples	· Identify source · Notify IEC and DBO Contractor · Repeat measurements to confirm findings · Increase monitoring frequency to daily · Discuss with IEC/IC for remedial actions required · If exceedance continues, arrange meeting with IEC · If exceedance stops, cease additional monitoring	· Review with analysed results submitted by ET · Review the proposed remedial measures by DBO Contractor and advise IC accordingly · Supervise the implementation of remedial measures	· Confirm receipt of notification of exceedance in writing · Notify DBO Contractor · Require DBO Contractor to propose remedial measures for the analysed dust problem · Ensure remedial measures are properly implemented	· Submit roposals for remedial actions to IEC within 3 working days of notification · Implement the agreed proposals · Amend proposal if appropriate

Event	ET	IEC	IC	DBO Contractor
Exceedance of Limit Level
1.Exceedance for one sample	· Identify source · Inform IEC and DBO Contractor · Repeat measurement to confirm findings · Increase monitoring frequency to daily · Assess effectiveness of DBO Contractor's remedial actions and keep EPD and IEC/IC informed of the results	· Check monitoring data and DBO Contractor's working methods · Discuss with ET Leader and DBO Contractor potential remedial actions · Supervise the implementation of remedial measures	· Confirm receipt of notification of exceedance in writing · Notify DBO Contractor · Require DBO Contractor to propose remedial measures for the analysed dust problem · Ensure remedial measures are properly implemented	· Take immediate action to avoid further exceedance · Submit proposals for remedial actions to IEC within 3 working days of notification · Implement the agreed proposals · Amend proposal if appropriate
2.Exceedance for two or more consecutive samples	· Identify source · Inform IEC, IC, and EPD the causes and actions taken for the exceedance · Increase monitoring frequency to confirm findings · Carry out analysis of DBO Contractor’s working procedures to determine possible mitigation to be implemented · Assess effectiveness of DBO Contractor’s remedial actions and keep IEC, EPD and IC informed of the results · If exceedance stops, cease additional monitoring	· Discuss amongst IC, ET Leader and DBO Contractor on the potential remedial actions. · Review DBO Contractor’s remedial actions whenever necessary to assure their effectiveness and advise IC accordingly · Supervise the implementation of remedial measures	· Confirm receipt of notification of exceedance in writing · Notify DBO Contractor · Require DBO Contractor to propose remedial measures for the analysed dust problem · Ensure remedial measures are properly implemented · If exceedance continues, consider what activity of the work is responsible and instruct DBO Contractor to stop that activity of work until the exceedance is abated	· Take immediate action to avoid further exceedance · Submit proposals for remedial actions to IEC within 3 working days of notification · Implement the agreed proposals · Resubmit proposals if problem still not under control · Stop the relevant activity of works as determined by the IC until the exceedance is abated

3.1.8 Dust Mitigation Measures

The EIA report has recommended dust control and mitigation measures. The DBO Contractor shall be responsible for the design and implementation of these measures:

· Dust emission from construction vehicle movement are confined within the worksites area.

· Watering facilities will be provided at every designated vehicular exit point.

· Watering will be carried out 8 times per day during construction phase.

If the above measures are not sufficient to restore the air quality to acceptable levels upon the advice of ET Leader, the DBO Contractor shall liaise with the ET Leader on some other mitigation measures, propose to IC and IEC for approval, and implement the mitigation measures.

3.2 Odour

3.2.1 Odour Patrol

Odour patrol is conducted by independent trained personnel / competent persons patrolling and sniffing around the boundary of WENT Landfill Extension and Air Sensitive Receivers to detect any odour at the concerned hours. Odour patrol should commence once the WENT Landfill Extension starts receiving waste. It should also be undertaken during aftercare phase.

The independent trained personnel / competent persons shall :

· have their individual odour threshold of n-butanol in nitrogen gas in the range of 20 to 80 ppb/v required by the European Standard Method (EN 13725).

· be at least 16 years of age and willing and able to follow instructions.

· be free from any respiratory diseases.

· be engaged for a sufficient period to build up and monitor/detect at several monitoring location;

· not be allowed to smoke, eat, drink (except water) or use chewing gum or sweets 30 min before and during odour patrol;

· take great care not to cause any interference with their own perception or that of others by lack of personal hygiene or the use of perfumes, deodorants, body lotions or cosmetics; and

· not communicate with each other about the results of their choices.

At least three independent trained personnel / competent persons shall be selected to form a patrol team to conduct the odour patrol.

The independent trained personnel / competent persons shall use their nose (olfactory sensors) to sniff odours at different locations. The main odour emission sources and the areas to be affected by the odour nuisance shall be identified.

The perceived odour level is to be divided into 5 levels which are ranked in the descending order as follows:

Table 3.4a Odour Level

Class	Odour Level	Description
0	Not Detected	No odour perceived or an odour so weak that it cannot be easily characterised or described.
1	Slight	Identified odour, slight
2	Moderate	Identified odour, moderate
3	Strong	Identified odour, strong
4	Extreme	Severe odour

The independent trained personnel / competent persons shall record the findings including odour level, odour nature and possible odour sources, and also the local wind speed and direction at each location. In addition, some relevant meteorological data such as daily average temperature, and daily average humidity, on that surveyed day shall be obtained from the Hong Kong Observatory Station for reference.

3.2.2 Odour Patrol Locations

The odour patrol locations are shown in Table 3.4b. The status and locations of air sensitive receivers may change after issuing this manual. If such cases exist, the ET Leader shall propose updated monitoring locations and seek approval from IC and IEC and agreement from EPD on the proposal. The monitoring locations are illustrated in Figure 3.1.

Table 3.4b Description of odour monitoring locations

AML ID	EIA ASR Ref	Location ^[1]	Land Uses	Monitoring Parameters
AM(O)1	A1-1	Ha Pak Nai	Residential	Odour Level
AM(O)2	A1-2	Ha Pak Nai	Residential
AM(O)3	A1-3	Ha Pak Nai	Residential
AM(O)4	A2-1	Black Point Power Station (Office and Control Room)	Industrial
AM(O)5	A4-1	Lung Kwu Sheung Tan	Place of Worship
AM(O)6	-	Project Boundary
AM(O)7
AM(O)8
AM(O)9

3.2.3 Event and Action

Table 3.5 shows the Action and Limit levels to be used, and the patrol frequency is listed in Table 3.6. Should non-compliance of the air quality criteria occur, the ET, the IC/IEC and the DBO Contractor shall undertake the relevant action in accordance with the Action Plan in Table 3.7.

Table 3.5 Action and limit levels for odour nuisance

Parameters	Action	Limit
Odour Nuisance (from odour patrol)	· When two documented complaint are received; or · Odour level of 2 is perceived from odour patrol.	· Five or more consecutive genuine documented complaints within a week; or · Odour level of 3 or above is perceived from odour patrol.

Parameters

Action

Limit

Odour Nuisance (from odour patrol)

· When two documented complaint are received; or

· Odour level of 2 is perceived from odour patrol.

· Five or more consecutive genuine documented complaints within a week; or

· Odour level of 3 or above is perceived from odour patrol.

Table 3.6 Odour Patrol Frequency

Phase	Patrol Locations	Patrol Frequency	Parameters
Operation / Restoration Aftercare	Patrol along Extension Site Boundary and ASRs Patrol along Extension Site Boundary and ASRs	Daily, three times a day in the morning, afternoon and evening / night (between 1800 and 2300) conducted by the ET and the IEC. Three times per week on different days conducted by an independent third party together with the ET and IEC^[1]. Weekly odour patrol.	Odour Level (see Table 3.4a) Odour Level (see Table 3.4a)

Phase

Patrol Locations

Patrol Frequency

Parameters

Operation / Restoration

Aftercare

Patrol along Extension Site Boundary and ASRs

Daily, three times a day in the morning, afternoon and evening / night (between 1800 and 2300) conducted by the ET and the IEC.

Three times per week on different days conducted by an independent third party together with the ET and IEC^[1].

Weekly odour patrol.

Odour Level (see Table 3.4a)

[1] Patrol shall be scheduled so that they are carried out together with one of the daily patrols to be carried out jointly by the ET and the IEC.

Table 3.7 Event/Action plan for odour nuisance

Event	ET	IEC	IC	DBO Contractor
Action Level	· Identify source · Inform IEC and DBO Contractor · If nuisance stops or external source has been identified, resume monitoring to routine mode · Recommend precautionary measures	· Review submissions and reports from ET	· Notify DBO Contractor · Ensure implementation of precautionary measures	· Rectify any unacceptable practice · Review the operation of odour enhancement facilities at leachate treatment plants · Amend working methods if appropriate · Carry out precautionary measures
Limit Level	· Identify source · Inform IEC, and IC, the causes and actions taken for the nuisance · Carry out analysis of DBO Contractor’s working procedures to determine possible mitigation to be implemented · Assess effectiveness of DBO Contractor’s remedial actions and keep IEC, EPD and IC informed of the results · If nuisance stops or external source has been identified, resume monitoring to routine mode	· Discuss amongst IC, ET Leader and DBO Contractor on the potential remedial actions. · Review DBO Contractor’s remedial actions whenever necessary to assure their effectiveness and advise IC accordingly · Supervise the implementation of remedial measures	· Confirm receipt of notification of exceedance in writing · Notify DBO Contractor · Require DBO Contractor to propose remedial measures for the analysed odour nuisance · Ensure remedial measures are properly implemented · If nuisance continues, instruct DBO Contractor to stop that activity of work suspected to be the origin of the nuisance source until the nuisance is abated	· Take immediate action to avoid further nuisance · Submit proposals for remedial actions to IEC within 3 working days of notification · Proposals include tipping at the far end of the upwind location; thicker daily cover can be arranged in case odour patrol identify potential odour nuisance; and use of immediate soil cover for sewage sludge, animal waste · Implement the agreed proposals · Resubmit proposals if problem still not under control

Event

IEC

DBO Contractor

Action Level

· Identify source

· Inform IEC and DBO Contractor

· If nuisance stops or external source has been identified, resume monitoring to routine mode

· Recommend precautionary measures

· Review submissions and reports from ET

· Notify DBO Contractor

· Ensure implementation of precautionary measures

· Rectify any unacceptable practice

· Review the operation of odour enhancement facilities at leachate treatment plants

· Amend working methods if appropriate

· Carry out precautionary measures

Limit Level

· Identify source

· Inform IEC, and IC, the causes and actions taken for the nuisance

· Carry out analysis of DBO Contractor’s working procedures to determine possible mitigation to be implemented

· Assess effectiveness of DBO Contractor’s remedial actions and keep IEC, EPD and IC informed of the results

· If nuisance stops or external source has been identified, resume monitoring to routine mode

· Discuss amongst IC, ET Leader and DBO Contractor on the potential remedial actions.

· Review DBO Contractor’s remedial actions whenever necessary to assure their effectiveness and advise IC accordingly

· Supervise the implementation of remedial measures

· Confirm receipt of notification of exceedance in writing

· Notify DBO Contractor

· Require DBO Contractor to propose remedial measures for the analysed odour nuisance

· Ensure remedial measures are properly implemented

· If nuisance continues, instruct DBO Contractor to stop that activity of work suspected to be the origin of the nuisance source until the nuisance is abated

· Take immediate action to avoid further nuisance

· Submit proposals for remedial actions to IEC within 3 working days of notification

· Proposals include tipping at the far end of the upwind location; thicker daily cover can be arranged in case odour patrol identify potential odour nuisance; and use of immediate soil cover for sewage sludge, animal waste

· Implement the agreed proposals

· Resubmit proposals if problem still not under control

3.3 Precautionary/Mitigation Measures During Operation, Restoration and Aftercare Phases

3.3.1 Stack Discharge from ASP, Flare and LFG Power Generator

· The maximum allowable discharge limit for ASP, flare and LFG power generator should be specified in the design specification.

· Owing to the requirement for the installation of stack, the design requirement shall be submitted to IEC and IC for vetting by the DBO Contractor under the Air Pollution Control (Furnaces, Ovens and Chimneys) (Installation and Alternation) Regulations.

· Subject to the subsequent EPD’s requirement on chimney installation, regular stack monitoring shall be carried out to demonstrate compliance during the operations. The monitoring parameters are summarised in Table 3.7a.

Table 3.7a Monitoring Parameters

Facilities	Monitoring Frequency	Monitoring Parameters
Ammonia Stripping Plant (ASP) & LFG Power Generator	Once every 3 months Continuous	NO_x,SO_2,RSP, NMOCs, Vinyl Chloride and Benzene Exhaust gas temperature Exhaust gas velocity
Flare	Once every 3 months Continuous	NO_x,SO_2,RSP, NMOCs, Vinyl Chloride and Benzene Exhaust gas temperature Exhaust gas velocity

Facilities

Monitoring Frequency

Monitoring Parameters

Ammonia Stripping Plant (ASP) & LFG Power Generator

Once every 3 months

Continuous

NO_x,SO_2,RSP, NMOCs, Vinyl Chloride and Benzene

Exhaust gas temperature

Exhaust gas velocity

Flare

Once every 3 months

Continuous

NO_x,SO_2,RSP, NMOCs, Vinyl Chloride and Benzene

Exhaust gas temperature

Exhaust gas velocity

· A monthly monitoring report should be prepared by ET and submitted to IEC and IC for approval.

3.3.2 Odour from Leachate Treatment Facilities

For the proposed leachate treatment plant in WENT Landfill Extension, the overall leachate treatment facilities include:

· Adopted updated treatment method such as Sequencing Batch Reactor for future leachate treatment. Provision of ventilated cover for the leachate storage tanks and emissions extracted to suitable odour removal filters with odour removal efficiency of 99%.

· Ferric nitrate or sodium hypochlorite can be added to oxidise the odourous chemical in the leachate. The pH value of leachate can be controlled to a suitable value from future on-site experiment such that the generation of any odourous H₂S and ammonia can be optimised.

· The locations of discharge points and discharge heights should be in accordance with the assumptions adopted in the EIA Report. If the future locations / heights of the stacks deviate from the assumptions adopted in the EIA Study, reassessment of the air quality impact should be conducted.

· The overall arrangement should be investigated in details by the DBO Contractor and agreed with IEC and EPD. As such, the odour emission from the future leachate treatment facilities will be insignificant.

3.3.3 Odour from Waste Transfer and Tipping Activities

During Operation / Restoration Phases

· Planting rows of trees along the northern side of WENT Landfill Extension (ie slope toe) and along realigned Nim Wan Road.

· Providing a vehicle washing facility before the exit of the landfill and providing sufficient signage to remind RCV drivers to pass through the facility before leaving the landfill.

· Reminding the RCV drivers to empty the liquor collection sump and close the valve before leaving the tipping face.

· Washing down the area where spillage of RCV liquor is discovered promptly.

· Reminding operators to properly maintain their RCVs properly and that liquor does not leak from the vehicles.

· Installation of vertical and/or horizontal LFG extraction system to enhance extraction of LFG from the waste mass and hence minimise odour associated with fugitive LFG emissions.

· Progressive / temporary restoration of the areas which reach the finished profile (a final capping system including an impermeable liner will be put in place) and installation of a permanent LFG extraction system.

· Maintaining the size of the active tipping face not greater than 2 x 60 m x 30 m. Only one tipping face within 1100m from ASR A1-3, 1200m from ASR A2-1 & 1200m from ASR A4-1 is allowed.

· Daily cover the compacted waste with 150mm of soil.

· Covering the non-active phase with 300mm to 600mm of soil / an impermeable liner (on top of the intermediate cover), which will not only prevent odour emissions from landfilled waste but also enhance LFG extraction by the LFG extraction system.

· Providing deodoriser for the LTP.

· Enclosing all the leachate storage and treatment tanks and diverting the exhaust air from these tanks to a deodoriser to avoid potential odour emissions from the LTP.

· As an improvement measure to enhance to environmental standard for waste transfer, EPD could take the initiative to recommend others to use enclosed type RCVs (dominantly government vehicles and sludge vehicles).

· Cleaning / watering of the surface and clearing of the waste water receptor of government RCV is recommended before leaving refuse transfer station or government Refuse Collection Point (FEHD).

· The trench for special waste shall be covered with soil immediately upon the disposal of special waste to reduce the odour emission.

· The use of alternative daily cover (less permeable layer) instead of inert material should be considered under worst-case weather condition, subject to EM&A Programme.

· The use of immediate daily cover for odorous waste such as animal waste etc. under critical condition should also be considered, subject to EM&A Programme.

· In accordance with some reference from New Zealand, odour from active tipping area can be much reduced if the waste is covered by sandwich covering material such that it is confined in a solid/semi solid condition. Such covering material will be acted as sandwich protective layers to block the interaction of waste. Only diffusion mode (small scale) will be present. These would be applied during very hot and stable weather condition. Twice daily covering (mid day and close of business) can be arranged in case odour patrol identify potential odour nuisance, subject to EM&A Programme.

· During stable and calm weather condition and subject to EM&A programme, tipping could be arranged to further increase the setback distance.

During Aftercare Phase

· Continue to maintain the integrity of the capping system.

· Provision of vertical and/or horizontal LFG extraction system to enhance extraction of LFG from the waste mass and hence minimise odour associated with fugitive LFG emissions.

· Enclosing all the leachate storage and treatment tanks and diverting the exhaust air from these tanks to a deodoriser to avoid potential odour emissions from the LTP.

3.3.4 VOC Surface Emission

· The VOC monitoring requirements are discussed in Section 7. Details will be further established in the Landfill Monitoring Plan (LMP) to be developed by the future DBO Contractor based on EM&A Manual for landfill gas monitoring.

· Subject to future engineering design, the arrangement of the landfill gas collection system and surface covering material for inactive tipping phases shall be reviewed by DBO Contractor every 5 years to identify any modern technology/arrangement (covering material, LFG well spacing and locations) and the latest WHO/USEPA health-risk criteria. A working team shall be formulated to review all processes, control practice and extraction system in order to maximise the efficiency of the system. A review report should be prepared by the DBO Contractor for the submission to IC and IEC on the implementation/arrangement of LFG extraction system. The first review report should be submitted to IC and IEC for agreement before commencement. With a good system to collect LFG (high extraction efficiency), surface release of VOC to the nearby environment can be much reduced or utilised.

· Maintain a slightly negative pressure within the entire tipping area (by suction). Minimise any potential leakage of LFG to the surrounding by increase the number of gas-extraction wells. Improve the extraction efficiency by checking/reinstate gas wells with abnormally low extraction rate due to blockage/soil movement or sedimentation.

· Increase the coverage of inactive tipping phases with HDPE/plastic sheet which can enhance the anaerobic decomposition (reduce air getting in and VOC leaking out).

· EM&A will be conducted at ASR to establish the future VOC ambient level. This monitoring work should be carried out in a frequency once every 3 months. By comparing the monitoring data at the boundary and at ASR, the cause of VOC and the general downwind dispersion effect (dilution effect) from the boundary to the ASR can be identified. The findings of the monitoring should be incorporated into the landfill gas collection system review report as mentioned above.

· The monitoring location is listed in Table 3.8 and illustrated in Figure 3.1. This off-site VOC monitoring report shall be submitted to IC and IEC for vetting.

Table 3.8 Off-site Surface gas monitoring locations at ASRs

AML ID		EIA ASR Ref	Location	Land Uses	Monitoring Indicator
AM(V)1	A1-1		Ha Pak Nai	Residential	VOCs as listed in Appendix D
AM(V)2	A1-2		Ha Pak Nai	Residential
AM(V)3	A1-3		Ha Pak Nai	Residential
AM(V)4	A2-1		Black Point Power Station (Office and Control Room)	Industrial
AM(V)5	A4-1		Lung Kwu Sheung Tan	Place of Worship

· VOCs monitoring results will be evaluated against the limit levels. The limit levels at the Extension Site Boundary are defined as WHO/USEPA/CARB’s ambient criteria if available or the odour thresholds or 1% of Occupational Exposure Limit (OEL) as stipulated in the “UK Health and Safety Executive (HSE) EH 40/05 Occupational Exposure Limits” whichever is lower.

· In case of exceedance of the limits levels, more frequent monitoring, as specified in the EAP in Section 7, should be conducted. This additional monitoring should be continued until the non-compliance is rectified.

4 Noise Monitoring

4.1 Monitoring Parameters

4.1.1 Construction Noise

Construction noise level shall be measured in terms of the A-weighted equivalent continuous sound pressure level (L_eq). Leq_30min shall be used as the monitoring parameter for the time period between 0700 and 1900 hours on normal weekdays. For all other time periods, Leq_5min shall be employed for comparison with the Noise Control Ordinance (NCO) criteria. As supplementary information for data auditing, statistical results such as L₁₀ and L₉₀ shall also be obtained for reference.

4.1.2 Operation and Traffic Noise

The noise level shall be measured in terms of the A-weighted equivalent continuous sound pressure level over a period of 30 minutes (L_{Aeq, 30mins}) and A-weighted 10% of time over a period of one hour (L_{A10, 1hr}) for operation noise and operation traffic noise, respectively. As supplementary information for data auditing, statistical results such as L_A10,L_Aeq and L_A90 shall also be obtained for reference.

4.2 Monitoring Equipment

In accordance with the Technical Memorandum (TM) 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 level from before and after the noise measurement agree to within 1.0dB.

The ET Leader shall be responsible for the provision, installation and maintenance of the monitoring equipment. He shall ensure that sufficient noise monitoring 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. The location of equipment installation should be proposed by the ET Leader and agreed with the IC and EPD in consultation with the IEC.

Noise measurements should not be made in the presence of fog, rain, wind with a steady speed exceeding 5m/s or wind with gusts exceeding 10m/s. The wind speed shall be checked with a portable wind speed meter capable of measuring the wind speed in m/s.

4.3 Monitoring Location

The ET shall carry out noise monitoring during the construction and operation phases at 1 monitoring station as shown in Table 4.1 and Figure 4.1. The status and locations of noise sensitive receivers (NSRs) may change after issuing this EM&A Manual. In such cases, the ET Leader should propose updated monitoring locations and seek approval from EPD.

Table 4.1 Noise monitoring locations

Monitoring ID	EIA NSR Ref	Location	Type of Monitoring	Monitoring Parameters	Supplementary Information
NM1	NSR-1	Ha Pak Nai	Construction & Operation	L_{Aeq, 30mins}	L_A10 and L_A90

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;

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

The monitoring station shall normally be at a point 1m from the exterior of the sensitive receivers building façade. In case of free-field noise measurement, the microphone shall be located at a position 1.2m above the 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 the free field measurements. The ET Leader shall agree with the IEC on the monitoring positions 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.

4.4 Baseline Monitoring

The ET shall carry out baseline noise monitoring prior to the commencement of the operation of landfill. The continuous baseline monitoring shall be carried out daily for a period of at least two weeks in a sample period of 5 minutes or 30 minutes. A schedule on the baseline monitoring shall be submitted to the IC and IEC for approval before the monitoring starts.

In exceptional case, when insufficient baseline monitoring data or questionable results are obtained, the ET Leader shall liaise with the IC, IEC 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 Construction Noise

During normal construction working hour (0700-1900 Monday to Saturday), monitoring of Leq_30min noise levels (as 6 consecutive Leq_5min readings) shall be carried out at the agreed monitoring locations once every week.

If a school exists near the construction activity, noise monitoring shall be carried out at the monitoring stations for the schools during the school examination periods. The ET Leader shall liaise with the school’s personnel and the Examination Authority to ascertain the exact dates and times of all examination periods during the course of the contract.

In case of non-compliance with the construction noise criteria, more frequent monitoring as specified in the Event and Action Plan 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.

A schedule on the compliance monitoring shall be submitted to the IEC and IC for approval before the monitoring starts.

4.6 Operation Noise

During normal operation working hours, monitoring of L_{Aeq, 30min}noise levels (as six consecutive L_{Aeq, 5min}readings) shall be carried out at the agreed monitoring locations once every week in accordance with the methodology in the TM.

Other noise sources such as road traffic and construction activities may make a significant contribution to the overall noise environment. Therefore, the results of noise monitoring activities shall take into account such influencing factors, which may not be present during the baseline monitoring period.

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

4.6.1 Traffic Noise

During normal operation working hours, monitoring of L_{A10, 1hr}noise levels shall be carried out at the agreed monitoring locations once every week in accordance with the methodology in the Section III of the “Calculation of Road Traffic Noise, 1998”.

The operation traffic noise monitoring will be measured in term of the A-weighted L₁₀ within the peak traffic hour for each designated noise monitoring location. Measurements were paused if noise detected from other non-traffic activities became dominant.

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

4.6.2 Event and Action Plan

The Action and Limit levels for construction, operation and traffic noise are defined in Tables 4.2-4.4. Should non-compliance of the criteria occur, actions in accordance with the EAP in Tables 4.5-4.6 shall be carried out.

Table 4.2 Action and limit levels for construction noise

Time Period

Action Level

Limit Level

0700 - 1900 hours on normal weekdays

When one documented complaint is received

75 dB(A)*

If works are to be carried out during restricted hours, the conditions stipulated in the construction noise permit issued by the Noise Control Authority have to be followed.

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

Table 4.3 Action and limit levels for operation noise

Time Period	Action Level	Limit Level
0700-1900 on all days	When one documented complaint is received	60dB(A) *
1900-2300 on all days		60dB(A) *
2300-0700 on all days		50 dB(A) *

* Only apply to operation noise without road traffic and construction activities noise.

Table 4.4 Action and limit levels for traffic noise

Time Period	Action Level	Limit Level
Hotel, hostels & all domestic premises including temporary housing accommodation	When one documented complaint is received	70dB(A)
Schools & Place of Public Worship	When one documented complaint is received	65 dB(A)

Table 4.5 Event and action plan for construction noise

Event	ET	IEC	IC	DBO Contractor
Exceedance of Action Level	· Identify source, investigate the causes of exceedance and propose remedial measures; · Notify IEC and DBO Contractor; · Report the results of investigation to IEC, IC and DBO Contractor; · Discuss with DBO Contractor and formulate remedial measures; · Increase monitoring frequency to check mitigation effectiveness.	· Review the analysed results submitted by ET; · Review the proposed remedial measures by DBO Contractor and advise IC accordingly; · Supervise the implementation of remedial measures.	· Confirm receipt of notification of failure in writing; · Notify DBO Contractor; · Require DBO Contractor to propose remedial measures for the analysed noise problem; · Ensure remedial measures are properly implemented.	· Submit noise mitigation proposals to IEC; · Implement noise mitigation proposals.
Exceedance of Limit Level	· Identify source; · Inform IEC, IC, EPD and DBO Contractor; · Repeat measurements to confirm findings; · Increase monitoring frequency; · Carry out analysis of Contractor’s working procedures to determine possible mitigation to be implemented; · Inform IEC, IC and EPD the causes and actions taken for exceedance; · Assess effectiveness of DBO Contractor’s remedial actions and keep IEC, EPD and IC informed of the results; · If exceedance stops, cease additional monitoring.	· Discuss amongst IC, ET, and DBO Contractor on the potential remedial actions; · Review DBO Contractors remedial actions whenever necessary to assure their effectiveness and advise IC accordingly; · Supervise implementation of remedial measures.	· Confirm receipt of notification of failure in writing; · Notify DBO Contractor; · Require DBO Contractor to propose remedial measures for the analysed noise problem; · Ensure remedial measures properly implemented; · If exceedance continues, consider what portion of the work is responsible and instruct DBO Contractor to stop that portion of works until the exceedance is abated.	· Take immediate action to avoid further exceedance; · Submit proposals for remedial actions to IEC within 3 working days of notification; · Implement the agreed proposals; · Resubmit proposals if problem still not under control; · Stop the relevant portion of works as determined by IC until the exceedance is abated.

Event

IEC

DBO Contractor

Exceedance of Action Level

· Identify source, investigate the causes of exceedance and propose remedial measures;

· Notify IEC and DBO Contractor;

· Report the results of investigation to IEC, IC and DBO Contractor;

· Discuss with DBO Contractor and formulate remedial measures;

· Increase monitoring frequency to check mitigation effectiveness.

· Review the analysed results submitted by ET;

· Review the proposed remedial measures by DBO Contractor and advise IC accordingly;

· Supervise the implementation of remedial measures.

· Confirm receipt of notification of failure in writing;

· Notify DBO Contractor;

· Require DBO Contractor to propose remedial measures for the analysed noise problem;

· Ensure remedial measures are properly implemented.

· Submit noise mitigation proposals to IEC;

· Implement noise mitigation proposals.

Exceedance of Limit Level

· Identify source;

· Inform IEC, IC, EPD and DBO Contractor;

· Repeat measurements to confirm findings;

· Increase monitoring frequency;

· Carry out analysis of Contractor’s working procedures to determine possible mitigation to be implemented;

· Inform IEC, IC and EPD the causes and actions taken for exceedance;

· Assess effectiveness of DBO Contractor’s remedial actions and keep IEC, EPD and IC informed of the results;

· If exceedance stops, cease additional monitoring.

· Discuss amongst IC, ET, and DBO Contractor on the potential remedial actions;

· Review DBO Contractors remedial actions whenever necessary to assure their effectiveness and advise IC accordingly;

· Supervise implementation of remedial measures.

· Confirm receipt of notification of failure in writing;

· Notify DBO Contractor;

· Require DBO Contractor to propose remedial measures for the analysed noise problem;

· Ensure remedial measures properly implemented;

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

· Take immediate action to avoid further exceedance;

· Submit proposals for remedial actions to IEC within 3 working days of notification;

· Implement the agreed proposals;

· Resubmit proposals if problem still not under control;

· Stop the relevant portion of works as determined by IC until the exceedance is abated.

Table 4.6 Event and action plan for operation and traffic noise

Event	ET	IEC	IC	DBO Contractor
Exceedance of Action Level	· Notify IEC and DBO Contractor · Carry out investigation · Report the results of investigation to IEC and the DBO Contractor · Discuss with the DBO Contractor and formulate remedial measures · Increase monitoring frequency to check mitigation measures	· Review with analysed results submitted by ET · Review the proposed remedial measures by DBO Contractor and advise IC accordingly · Supervise the implementation of remedial measures	· Confirm receipt of notification of exceedance in writing · Notify DBO Contractor · Require DBO Contractor to propose remedial measures for the analysed noise problem · Ensure remedial measures are properly implemented	· Submit noise mitigation proposals to IEC · Implement noise mitigation proposals
Exceedance of Limit Level	· Identify source · Notify IEC, IC, EPD and DBO Contractor · Repeat measurement to confirm findings · Increase monitoring frequency · Carry out analysis of DBO Contractor’s working procedures to determine possible mitigation to be implemented · Inform IEC, IC, and EPD the causes and actions taken for the exceedance · Assess effectiveness of DBO Contractor’s remedial actions and keep IEC, EPD and IC informed of the results · If exceedance stops, cease additional monitoring	· Discuss amongst IC, ET Leader and DBO Contractor on the potential remedial actions. · Review DBO Contractor’s remedial actions whenever necessary to assure their effectiveness and advise IC accordingly · Supervise the implementation of remedial measures	· Confirm receipt of notification of exceedance in writing · Notify DBO Contractor · Require DBO Contractor to propose remedial measures for the analysed noise problem · Ensure remedial measures are properly implemented · If exceedance continues, consider what activity of the work is responsible and instruct DBO Contractor to stop that activity of work until the exceedance is abated	· Take immediate action to avoid further exceedance · Submit proposals for remedial actions to IEC within 3 working days of notification · Implement the agreed proposals · Resubmit proposals if problem still not under control · Stop the relevant activity of works as determined by the IC until the exceedance is abated

Event

IEC

DBO Contractor

Exceedance of Action Level

· Notify IEC and DBO Contractor

· Carry out investigation

· Report the results of investigation to IEC and the DBO Contractor

· Discuss with the DBO Contractor and formulate remedial measures

· Increase monitoring frequency to check mitigation measures

· Review with analysed results submitted by ET

· Review the proposed remedial measures by DBO Contractor and advise IC accordingly

· Supervise the implementation of remedial measures

· Confirm receipt of notification of exceedance in writing

· Notify DBO Contractor

· Require DBO Contractor to propose remedial measures for the analysed noise problem

· Ensure remedial measures are properly implemented

· Submit noise mitigation proposals to IEC

· Implement noise mitigation proposals

Exceedance of Limit Level

· Identify source

· Notify IEC, IC, EPD and DBO Contractor

· Repeat measurement to confirm findings

· Increase monitoring frequency

· Carry out analysis of DBO Contractor’s working procedures to determine possible mitigation to be implemented

· Inform IEC, IC, and EPD the causes and actions taken for the exceedance

· Assess effectiveness of DBO Contractor’s remedial actions and keep IEC, EPD and IC informed of the results

· If exceedance stops, cease additional monitoring

· Discuss amongst IC, ET Leader and DBO Contractor on the potential remedial actions.

· Review DBO Contractor’s remedial actions whenever necessary to assure their effectiveness and advise IC accordingly

· Supervise the implementation of remedial measures

· Confirm receipt of notification of exceedance in writing

· Notify DBO Contractor

· Require DBO Contractor to propose remedial measures for the analysed noise problem

· Ensure remedial measures are properly implemented

· If exceedance continues, consider what activity of the work is responsible and instruct DBO Contractor to stop that activity of work until the exceedance is abated

· Take immediate action to avoid further exceedance

· Submit proposals for remedial actions to IEC within 3 working days of notification

· Implement the agreed proposals

· Resubmit proposals if problem still not under control

· Stop the relevant activity of works as determined by the IC until the exceedance is abated

4.6.3 Environmental Mitigation Measures

The DBO Contractor shall be responsible for implementation of the noise control and mitigation measures during construction and operation phases, which shall include, but not limited to, the following:

· Quiet equipment and construction method should be employed;

· Only well-maintained plant shall be operated on site and plant shall be serviced regularly during the construction work;

· Machines and plant that may be in intermittent use (such as breakers) shall be shut down between work periods or should be throttled down to a minimum;

· Mobile plant shall be sited as far away from NSRs as possible;

· Material stockpiles and other structures shall be effectively utilised, where practicable, to screen noise from on-site construction activities;

· Silencers or mufflers on construction equipment should be properly fitted and maintained during the construction works.

· Build a noise bund of about 3.5m tall along the north eastern seafront of the existing WENT Landfill to provide a screening effect of at least 5dB(A) from the berths.

An EMIS of the recommended mitigation measures is presented in Appendix C2.

5 Water Quality Monitoring

5.1 Introduction

Potential water pollution sources arising from construction activities include sources mainly from land-based activities, such as construction site runoff; sewage effluent due to workforce on site; accidental spillage of chemical; drainage diversion; and groundwater seepage.

Potential water pollution sources arising from operation include sources mainly from land-based activities, such as seepage of leachate, accidental leakage of leachate and erosion.

The EIA Report has assessed the water quality impacts caused by the construction and operation of WENT Landfill Extension. Mitigation measures have been recommended in the EIA to ensure compliance with the relevant legislative requirements. These mitigation measures are summarised in following sections. An EMIS of the recommended mitigation measures is presented in Appendix C3.

5.2 Precautionary / Mitigation Measures during Construction, Operation, Restoration and Aftercare Phases

5.2.1 Construction Phase

5.2.1.1 Construction Site Runoff

In accordance with the Practice Note for Professional Persons on Construction Site Drainage, Environmental Protection Department, 1994 (ProPECC PN 1/94), and DSD Technical Circular TC14/2000, construction phase precautionary measures as presented in Appendix C3 shall be implemented where necessary. By adopting the above precautionary measures with Best Management Practices (BMPs) it is anticipated that the impacts of runoff from the construction site will be reduced to satisfactory levels before discharges.

The construction runoff discharged from the landfill site shall fully comply with the standards stated in Section 5.2 of the EIA report, otherwise the discharge shall be collected and conveyed to the on-site leachate treatment plant.

5.2.1.2 Sewage from Workforce

Portable chemical toilets and sewage holding tanks will be provided for handling the sewage generated by the workforce. A licensed contractor will be employed to provide appropriate and adequate portable toilets and be responsible for appropriate disposal and maintenance.

5.2.1.3 Accidental Spillage of Chemical

Any service workshops and maintenance facilities will be located within a bunding area, and sumps and oil interceptors will be provided. Maintenance of equipment involving activities with potential for leakage and spillage will only be undertaken within the areas appropriately equipped to control these discharges.

5.2.2 Operation, Restoration and Aftercare Phases

5.2.2.1 Contingency Plan on Accidental Leakage of Leachate

Existing Contingency Plan for Groundwater Contamination

The existing Contingency Plan is comprehensive and well-developed and will be used as basis for developing the Contingency Plan for the extension site. The parameters to be monitored include groundwater level and groundwater quality. The objective of the monitoring programme is to ensure that the trigger levels below are not exceeded.

Ammonia Nitrogen : 0.5 mg/L

COD : 20 mg/L

BOD: 5 mg/L

In the event that the above trigger levels are exceeded, the DBO Contractor will implement a Corrective Action Programme, which shall include:

· groundwater interception and diversion; and

· groundwater extraction (by active pumping of leachate from leachate and groundwater collection layers) and treatment prior to discharge.

Proposed Modifications to Contingency Plan for Groundwater Contamination

Potential actions to be taken in case of identification of groundwater contamination should also include:

· Installation of additional ground-water monitoring well;

· Increased frequency of ground-water quality testing;

· Installation of ground-water extraction wells to remove contaminated groundwater for treatment;

· Installation of subsurface barriers, such as bentonite;

· Detailed investigation of the potential impact to be performed within six months of the first detection of the justified impact.

Contingency Plan for Surface Water Contamination

Surface water monitoring will be conducted to keep the ammonia-nitrogen, BOD and COD below the following trigger levels:

Ammonia Nitrogen : 0.5 mg/L

COD : 30 mg/L

BOD : 20 mg/L

In the event that any one of the above parameters was exceeded, the landfill operation should implement a Corrective Action Programme. The key elements shall include:

· Surface water interception and temporary storage of the contaminated surface water;

· Installation of surface barriers, such as sand bund along the surface water channel / site boundary to avoid overflow off-site;

· Active pumping of the contaminated surface water to the on-site leachate treatment plant;

· Additional monitoring locations will be selected to determine the pollution source;

· Installation of surface barriers, such as intercepting bund to separate the active and inactive tipping area;

· Change of working methods to prevent surface water contamination; and

· Implementation of diversionary works.

5.2.2.2 Erosion Control

The DBO Contractor shall devise a soil erosion control plan during the detailed design stage so as to define the site-specific measures and procedures (including the specific operation plan, implementation frequency, monitoring procedures, maintenance schedules, etc). Such requirement shall be specified in contract documents. Appendix C3 summarizes the most popular erosion control methods for reference.

5.2.2.3 Surface Water Drainage System

A temporary surface water drainage system to manage runoff will be adopted during construction and operation. It consists of perimeter channels around the site perimeter. It will collect surface water from higher elevations to lower elevations and ultimately to the discharge point.

The surface flow discharge from the landfill site shall fully comply with the standards stated in Section 5.2 of the EIA report, otherwise the contaminated surface flow shall be collected and disposed of at the on-site leachate treatment plant.

5.3 Leachate Monitoring

The DBO Contractor shall develop and operate a programme of monitoring which shall record the progressive generation of leachate at the WENT Landfill Extension in accordance with the following objectives:

· To determine the level of leachate within the landfill;

· To determine the quality of leachate arising from the landfill;

· To determine the quantity of leachate arising from the landfill and being treated;

· To monitor the quantity and quality of treated leachate from the leachate treatment works before discharging into leachate pipeline connecting to DSD Lung Kwu Cheung Tan Outfall Chamber, which finally discharge to the Urmston Road Submarine Outfall;

· To ascertain the landfill characteristics and effectiveness of the leachate treatment works.

The leachate monitoring programme shall commence at the start of landfill operations and continue until the issue of the Aftercare Certificate. The programme shall be developed with in-built flexibility to allow for modification during the development of the leachate treatment works and any modifications to the monitoring of the quality and quantity of leachate generated.

5.3.1 Equipment

Routine sampling and on-site measurements of leachate quality shall be carried out with appropriate equipment which includes:

· Portable thermometer, pH and electrical conductivity (EC) meter

· Sample bottle of glass or PET of volume not less than 1 litre

· Flowmeters

Level sensors shall be incorporated for measurement of leachate level. In addition, a dipstick and measuring tape shall be used to determine (in-situ) normal leachate levels if the level sensor is not operative.

5.3.2 Calibration and Maintenance

The DBO Contractor shall ensure that all equipment are calibrated and maintained according to manufacturer’s instructions. Routine maintenance shall be carried out in strict accordance with the manufacturer’s requirements. Where calibration intervals are not specified by the equipment manufacturer, the length of time between calibration periods shall not be greater than 6 months.

An inspection procedure shall be established to ensure that the frequency of maintenance is regularised for each equipment. Results from the monitoring programme shall be used to assist in the ongoing operation of the leachate treatment works to ensure that the facility is being operated under the optimum conditions, and that the leachate discharge complies with the trigger levels specified in Section 5.3.8.

5.3.3 Procedures

The DBO Contractor shall monitor leachate levels within the landfill using calibrated submersible level sensors.

Quantity of raw leachate shall be monitored using in-line flow meters installed in the pipe. The flow meters shall be designed and constructed to determine the volume and rate of leachate leaving the landfill site to an accuracy and precision of within +/- 1%.

At the same locations, the leachate shall also be monitored periodically to assess leachate quality produced within operation areas and after treatment. This shall be achieved using in-line sampling valves/taps. The design and construction of these valves/taps shall be such that samples of leachate of between 1 and 25 litres can be readily and easily obtained without sampling rates being too high resulting in unacceptably-high levels of splashing or too low making the duration of sampling unacceptably long.

The DBO Contractor shall use the groundwater drainage layer to detect any leachate escaping through the liner system. The detection system shall involve daily sampling at the groundwater discharge point (shown as Leachate Leakage Detector) and the groundwater monitoring boreholes.

5.3.4 Analysis Parameters

All leachate samples shall be collected and transported to a HOKLAS accredited laboratory as soon after sampling as possible. Appropriate pre-treatment of samples shall be prepared in respect of the analytical parameters, with due regard to its holding times.

Leachate quality shall be monitored as a feedback to the operation for optimisation of the leachate treatment works and to establish its trend over the life of the landfill. The programmes shall generate data to support the establishment of a procedure for the necessary treatment and safe disposal of effluent from WENT Landfill Extension.

The following parameters shall be measured in accordance with the standards contained within the Specification:

Table 5.1 Suite 1 - Leachate Monitoring :

Programme A			Programme B
Parameters	Detection Limit	Frequency	Parameters	Detection Limit	Frequency
Temperature *	0.1°C	Weekly basis initially and then monthly when settled values are obtained for the first 3 years of WENT Landfill Extension operation	Mg	50 mg/L	Monthly basis initially and then 3 monthly Intervals when settled values are obtained for the first 3 years of WENT Landfill Extension operation
pH *	0.1		Ca	50 mg/L
Electrical conductivity *	1 mS/cm		K	50 mg/L
COD	10 mg/L		Fe	50 mg/L
BOD5	3 mg/L		Ni	1 mg/L
TOC	1 mg/L		Zn	10 mg/L
SS	0.1 mg/L		Mn	1 mg/L
Ammonia-nitrogen	0.2 mg/L		Cu	1 mg/L
Nitrate	0.5 mg/L		Pb	1 mg/L
Nitrite	0.5 mg/L		Cd	0.2 mg/L
Total Nitrogen	0.4 mg/L
Sulphate	5 mg/L
Phosphate	0.01 mg/L
Chloride	0.5 mg/L
Sodium	50 mg/L
Alkalinity	1 mg/L
Volatile fatty Acids	2 mg/L

* On-site measurement

Table 5.2 Suite 2 - Leachate Monitoring

Parameters	Detection Limit	Parameters	Detection Limit	Frequency
Temperature	0.1°C	Phosphate	0.01 mg/L	Quarterly Basis after the first 3 years of WENT Landfill Extension operation
pH	0.1	Chloride	0.5 mg/L
COD	10 mg/L	Sodium	50 mg/L
BOD5	3 mg/L	Alkalinity	1 mg/L
SS	0.1 mg/L	Fe	50 mg/L
Ammonia-nitrogen	0.2 mg/L	Zn	10 mg/L
Nitrate	0.5 mg/L	Cu	1 mg/L
Total Nitrogen	0.4 mg/L	Cd	0.2 mg/L
Sulphate	5 mg/L	Cd	0.2 mg/L

Suite 1 (Programme A and Programme B) shall be used to establish the quality of leachate from each collection point (i.e., before and after treatment) for the first 3 years of WENT Landfill Extension operation, and Suite 2 shall be used for routine monitoring thereafter.

For leachate leakage detection, the DBO Contractor shall analyse the samples taken at the groundwater discharge point for ammonia-nitrogen, pH and conductivity. If necessary, COD shall be tested when high ammonia-nitrogen is detected at the groundwater discharge point. Samples shall be stored and preserved according to the guidelines of the approved accredited laboratory.

5.3.5 Frequency and Locations of Sampling

The DBO Contractor shall take raw leachate samples and treated leachate samples. The frequency and sampling locations are summarized in Table 5.3.

Table 5.3 Frequency and Locations of Sampling

Program	Frequency	Location
Suite 1, Programme A	Weekly intervals initially and then monthly when settled values are obtained	At new leachate Collection Points (i.e prior to discharging points at raw leachate storage tank for raw leachate monitoring and discharge point of SBR tank.)
Suite 1, Programme B	At monthly intervals and then three monthly intervals when settled values are obtained for the first three years of WENT Landfill Extension operation
Suite 2	At quarterly intervals after Suite 1 programme B

The DBO Contractor shall monitor levels of leachate continuously using calibrated submersible pressure transducers via data retrieving equipment. Daily records of leachate production shall be maintained via data logging flow meters for all abstraction of liquid from the site and leachate quantities leaving the site.

The DBO Contractor shall determine the locations of leachate monitoring points and submit the proposed plan to the Independent Consultant for approval.

5.3.6 Results

All sample containers shall be clearly marked, and identified with relevant sampling information. In addition, all monitoring results and observations made at time of sampling shall be recorded in a field data sheet specifically allocated to that sampling task. The following information shall be recorded on each sampling visit:

· Sampling point;

· Data and time of sample collection;

· Name of technician carrying out the sampling;

· Weather conditions and ambient temperature;

· General appearance, condition and temperature of the water body;

· Sampling device and method used;

· Sample preservation used;

· Storage requirements adopted;

· Space for listing analytical determinations.

5.3.7 Leachate Leakage Detection

Facilities to detect leakage within a 24-hr period shall be placed in the manner and positions specified and be monitored daily for the presence of leachate or contaminated water.

5.3.8 Trigger Levels

The DBO Contractor shall operate a programme of monitoring with the following objectives:

· Determine the level of leachate within the landfill;

· Determine the quality of leachate from the landfill;

· Determine the quantity of leachate from the landfill.

The DBO Contractor shall monitor the levels of leachate continuously at the leachate collection point through the use of calibrated submersible level sensors via data retrieving equipment. The level of leachate at any point within the landfill shall not exceed 1m height above the top of the primary barrier of the landfill liner system.

The proposed leachate treatment process will be designed by the future operator to suit its landfill development phasing and sequence. It is up to the future operator to determine which treatment process is preferred to enhance cost-effective.

In general, the objective of leachate treatment at tall landfill sites is to attain the required standards for discharge. It is noted that the Discharge License for the existing WENT Landfill EP760/431/009097/T has set out the following limits for the effluent discharge. Due to the ‘No Net Increase in Pollution Loads Requirement in Deep Bay’, it is reasonable to assume the same standards to be applied for the WENT Landfill Extension.

Table 5.3a Treatment Objectives

Determinand	Limit
Flow rate for total effluent	2,600 m³/day
pH	6-10
Suspended Solids	< 800 mg/l
Biochemical Oxygen Demand (5days)	< 800 mg/l
Chemical Oxygen Demand	< 2,000 mg/l
Total Nitrogen	< 200 mg/l

The discharge limit of treated leachate set out in the licence for the existing WENT Landfill is 2,600 m³/day (800m³/day for General Effluent and Grease Trap Waste Treatment Effluent; and 1,800m³/day for Landfill Leachate). To minimise the environment impacts to surrounding and the sewage impact to downstream DSD Lung Kwu Sheung Tan Outfall Chamber and Urmston Road Outfall, the discharge limit fot the combined existing WENT Landfill and its extension will be the same as existing Discharge Licence, ie 2,600 m³/day.

The treated leachate from the leachate treatment works will discharge to DSD Lung Kwu Sheung Tan Outfall Chamber and then Urmston Road Outfall.

5.3.9 Corrective Action

If the trigger levels in Section 5.3.8 are exceeded, the DBO Contractor shall implement a Corrective Action Programme, which shall include:

· Leachate extraction;

· Phased development and closure to minimise the active area footprint;

· Temporary geosynthetic covers to minimize infiltration in active cells;

· Run-on and runoff control systems for active and closed areas;

· Low permeability final cover system to minimise infiltration during post-closure;

In event that the DBO Contractor detects leachate leakage (i.e. the trigger level is exceeded at the groundwater discharge point), the liquid shall be treated at the leachate treatment plant prior to discharge to the Lung Kwu Sheung Tan Outfall Chamber and Urmston Road Outfall.

5.4 Groundwater Monitoring

Groundwater Level

5.4.1 Introduction

Groundwater levels shall be monitored over the working life of the site to determine the following information:

· Natural seasonal variation in groundwater levels;

· Effects of any ground water abstraction;

· Identification of hydraulic gradients;

· Variation caused by the construction, operation or aftercare.

5.4.2 Equipment

A portable dip meter, not affected by condensation, shall be used to measure water depth and checked before use. The dip meter shall comprise a graduated tape and sonic indicator of water level.

5.4.3 Procedures

Water level measurements shall be carried out prior to any purging or sampling from monitoring holes.

The DBO Contractor shall take groundwater level measurements relative to a permanent fixed datum at a measured elevation at each location, situated and marked on the monitoring borehole casing or cover. Recorded levels shall be expressed as metres relative to Principal Datum, and the levels checked 3 times prior to recording the measurements.

5.4.4 Frequency and Locations of Sampling

All manual groundwater level measurements shall be carried out at least once a month.

In the event that automatic measuring equipment is installed, the associated data loggers shall be interrogated / downloaded at least on a monthly basis. The automatic monitoring equipment shall be calibrated monthly and periodic manual water level measurements shall be carried out to corroborate the measurements.

Monthly groundwater monitoring shall be carried out at specified points G1-G63 in accordance with Figure 5.1 unless otherwise approved by the IC.

5.4.5 Results

All manual water level measurements shall be recorded relative to both monitoring borehole datum and Principal Datum. All automatic monitoring equipment shall be in a form that can be input to computer and displayed in numerical or graphical form. Results shall include site name; unique monitoring borehole reference or location code; date and water level in metres below monitoring borehole datum and to Principal Datum.

Groundwater Quality

5.4.6 Equipment

The criteria for selection of appropriate equipment shall depend upon the purpose of the sampling exercise, the site characterisation and the parameters that are to be analysed. This shall be assessed using the following criteria:

· Required sampling accuracy and precision

· Sampling frequency;

· Sampler construction material;

· Required head;

· Required discharge rate;

· Reliability and ease of maintenance, including availability of spares.

Teflon and/or stainless steel samplers (e.g. bailers) shall be used to sample groundwater.

Where sampling relies on the sample being pumped to the surface via tubing, the tubing used shall be Teflon, Teflon lined, or polypropylene. Bladder pumps shall be used to purge and to sample. Groundwater may be pumped from depths in excess of 100m below ground level, due to the depth to groundwater and the topographic level of the site.

5.4.7 Calibration and maintenance

Before each purging process, field meters shall be calibrated according to manufacturer specifications and the calibration results recorded in a calibration log file. All sampling equipment shall be thoroughly decontaminated as per standard sampling protocol prior to use.

5.4.8 Procedures

The DBO Contractor shall purge a monitoring borehole before a sample is taken in order that representative groundwater is sampled. This process shall be combined with field monitoring of determinants such as electrical conductivity, pH and temperature, so that stable sampling conditions can be achieved. If the water is contaminated it shall be contained and treated as leachate, otherwise abstracted groundwater shall be discharged to the surface water drainage system.

Samples shall be stored and preserved according to the guideline of approved accredited laboratory. Representative groundwater sample shall be collected, in approved receptacles as follows:

· Sampling containers shall be pre-rinsed with the water being collected, except in the case where specific determinations require preservatives in pre-prepared bottles;

· Glass containers shall be used for receipt of samples for organic analysis;

· Polyethylene containers shall be used for other determinants, except trace metals determinants such as mercury;

· Water shall be poured into sampling bottles carefully until filled completely, unless a specific volume is required by the analytical laboratory;

· A minimum of one litre sample shall be taken, unless otherwise specified;

· On-site measurement of EC, pH and temperature shall be carried out;

· On completion of sampling, portable equipment shall be removed from the borehole, and cleaned prior to use at next installation.

All sample bottles shall be labelled, samples shall be kept at for degrees centigrade and sent to the laboratory within specified holding times for the analytical methods. Samples shall be sent to the laboratory with appropriate chain-of-custody documentation.

Analysis of samples shall be carried out in accordance with methods described in American Society for Testing and Material (ASTM) or American Public Health Association (APHA) – American Water Works Association (AWWA) – Water Pollution Control Federation (WPCF).

5.4.9 Results

All sample containers shall be clearly marked to show the site name, location and date of sample collection. All results shall be presented as following:

· Site name;

· Unique sampling location reference;

· Time and date of the sampling;

· Name of the sampling technician;

· Weather conditions and air temperature;

· Appearance, condition and temperature of the water body;

· Sampling device used;

· On-site measurements of EC, pH and temperature;

· Volume of water purged prior to sampling;

· Physical description of the sample.

5.4.10 Analysis Parameters

The DBO Contractor shall measure the parameters according to the Table 5.4 in monthly basis. In the event of contamination being detected in the monthly monitoring programme, additional groundwater monitoring shall be carried out in weekly basis.

Table 5.4 Groundwater Monitoring

Parameters	Detection Limit	Normal Frequency	Additional Frequency
Temperature	0.1°C	Monthly basis
pH	0.1	Monthly basis	Weekly Basis
Electrical conductivity	1 mS/cm	Monthly basis	Weekly Basis
COD	10 mg/L	Monthly basis	Weekly Basis
BOD₅	3 mg/L	Monthly basis	Weekly Basis
SS	0.1 mg/L	Monthly basis	Weekly Basis
Ammonia-nitrogen	0.2 mg/L	Monthly basis	Weekly Basis
Nitrate	0.5 mg/L	Monthly basis	-
TKN	0.4 mg/L	Monthly basis	-
Sulphate	5 mg/L	Monthly basis	-
Sulphite	2 mg/L	Monthly basis	-
Phosphate	0.01 mg/L	Monthly basis	-
Chloride	0.5 mg/L	-	Weekly Basis
Iron	50 mg/L	-	Weekly Basis
Zinc	10 mg/L	-	Weekly Basis
Coliform Count	1 cfu/ 100mL	Monthly basis	Weekly Basis

5.4.11 Trigger Levels

The DBO Contractor shall propose a permanent monitoring network at the site to include the following:

· Detailed information on the hydrogeological regime;

· Details on seasonal groundwater level fluctuations and short-term variations in certain areas;

· Detailed baseline groundwater quality information;

· Detailed pumping test data for areas down gradient of the site where contaminants are likely to migrate.

The DBO Contractor shall monitor groundwater around the site to ensure that the following trigger levels are not exceeded Table 5.4a.

Table 5.4a Trigger Levels of NH₃-N, COD and BOD

Monitoring Point	Trigger Level (mg/l)
Monitoring Point	NH3-N	COD	BOD
Groundwater monitoring hole	0.5	20	5

5.4.12 Corrective Action

In the event that the above trigger levels are exceeded, the DBO Contractor shall implement a Corrective Action Programme, which shall include:

· Groundwater extraction and, if necessary, treatment prior to discharge;

· Groundwater interception and diversion.

5.5 Surface Water Monitoring

5.5.1 Introduction

The DBO Contractor shall carry out surface water monitoring from the commencement of the works until the issue of the Aftercare Certificate in accordance with the following objectives:

· To assess the performance of the registered design, where: surface water leaves the site and/or the landfill boundary; surface water leaves an operation area; and surface water leaves areas of potential contamination e.g., waste reception area, vehicle and wheel washing, haul route, vehicle servicing, etc.

· To ensure no long-term deterioration in surface water quality adjacent to the site;

· To provide data for the design and to monitor the effectiveness of any remedial measures which may be necessary in the event of excessive leachate migration or liner failure.

Surface water monitoring stations shall be established in and around the site as part of the monitoring programme.

5.5.2 Equipment

For monitoring surface water quality, the DBO Contractor shall use the following sampling and measuring equipment:

· Varying water sample containers, as appropriate to the type of analysis being determined, fabricated from polyethylene, polypropylene, polycarbonate, aluminium, stainless steel or glass

o Glass containers for organic constituents, but where major constituents of glass are to be analysed (e.g. sodium, potassium, boron, silicon and trace metallic impurities), glass containers shall not be used.

o Polyethylene containers shall not be used for trace metallic impurities such as mercury.

· Silicon sieve/disposable filters for removal of suspended solids

· Thermometer with a range of 0-50°C

· Digital pH meter

· Electrical conductivity meter

A clamp, pole or string shall be attached to the bottle if the water poses a threat to the sampling technician or if direct contact is likely to be made with skin. However, in all situations, gloves shall be worn as a matter of routine when sampling potentially-contaminated water.

The following equipment or the approved equivalents shall be provided for monitoring flow:

· IS32 flow monitor complete with Druck transducer capable of measuring parameters of depth and velocity at specified intervals, with trip mode built-in.

· Velocity calibrator – Montec 3013 portable Doppler measurement for in-situ calibrations of velocity. A 1.25m logging wand shall be used for recording in-situ measurements.

· Monitoring software – specifically designed for use with IS32 and Montec 3013, to produce depth, velocity and discharge graphs, as well as tabulated data.

5.5.3 Calibration and Maintenance

Clean, pre-conditioned/washed sample containers shall be used during the sampling programme. Sample containers shall be used only once with the exception of glass containers appropriately decontaminated at the analytical laboratory prior to use. All sampling equipment including open-mouthed collection vessels (buckets and cans) and sieves shall be decontaminated prior to use between sample points to prevent cross contamination. Decontamination procedures involve the use of laboratory grade detergent and rinsing in de-ionized water. Sample bottles that contain chemical preservatives shall not be rinsed or cleansed in any way.

Thermometers shall be rinsed with de-ionized water and then wiped with disposable towels immediately after use before being replaced in the carrying case.

All flow measuring equipment shall be calibrated according to the manufacturer’s specifications.

5.5.4 Procedures

The DBO Contractor shall undertake sampling of surface water quality with reference to the following documents:

· British Standard Institution (BSI) BS6068: 1981 Water Quality Sampling Section 6.1. Guidance on the Design of Sampling Programmes

· International Standard Organisation (SO) ISO 5667-6 1990 Guidance on Sampling of Rivers and Streams

· BSI, BS 6068 1983 Water Quality Section 6.2 Guidance on Sampling Techniques. Health and Safety Executive

· BSI, BS 6068: 1986 Water Quality Section 6.3 Guidance on the Preservation and Handling of Samples (International Standards Organisation ISO 5667/3 – 1985 Water quality – Sampling – Part 3: Guidance on the Preservation and Handling of Samples).

Before sampling, the flow rate of the stream/river shall be determined and the water and air temperature, pH and electrical conductivity shall be measured and recorded.

All the precautions outlined in the Specification for avoiding contamination during sampling shall be taken, for example, pre-rinsing sampling containers (excluding those containers which are preserved by certain type of chemicals) with the surface water to be collected. In addition, appropriate health and safety precautions including the wearing of protective waterproof gloves shall be followed.

In general, samples shall be collected from within 500mm of the water surface. Samples shall be collected within an open mouthed vessel with the lip pointing upstream. The sample shall be filtered as appropriate. Alternatively the sample shall be collected directly into the sample container. Sampling of the surface film layer shall be avoided during the sampling programme.

During sample collection, care shall be taken so that air is not introduced into the samples thereby altering the relative compositions of the determinants. Once the sample bottle is filled to the top with no remaining air space the lid shall be securely screwed on. Where samples are to be preserved with acid or alkalis prior to transport to the laboratory, the sample bottles shall be filled to the level specified by the analytical laboratory.

Samples shall be transported to the laboratory for analysis as soon as possible after the sample is collected, since the longevity of some of the sample determinants is limited. All samples shall be stored at 4°C and transported to the laboratory within 48 hours from sampling.

Analyses shall be carried out in accordance with methods described in ASTM or APHA – AWWA – WPCF Standard.

Flow measurements shall also be taken continuously using automatic logging equipment.

5.5.5 Analysis Parameters

The DBO Contractor shall measure the all parameters according to Table 5.5 in monthly basis. In the event of contamination being detected in the monthly monitoring programme, additional surface water monitoring shall be carried out in weekly basis.

Table 5.5 Surface Water Monitoring

Parameters	Detection Limit	Normal Frequency	Additional Frequency
pH	0.1	Monthly basis	Weekly Basis
Electrical conductivity	1 mS/cm	Monthly basis	Weekly Basis
Alkalinity	1 mg/L	Monthly basis	-
COD	10 mg/L	Monthly basis	Weekly Basis
BOD5	3 mg/L	Monthly basis	Weekly Basis
TOC	1 mg/L	Monthly basis	Weekly Basis
SS	0.1 mg/L	Monthly basis	Weekly Basis
Ammonia-nitrogen	0.2 mg/L	Monthly basis	Weekly Basis
TKN	0.4 mg/L	Monthly basis	-
Nitrate	0.5 mg/L	Monthly basis	-
Sulphate	5 mg/L	Monthly basis	-
Sulphite	2 mg/L	Monthly basis	-
Phosphate	0.01 mg/L	Monthly basis	-
Chloride	0.5 mg/L	Monthly basis	-
Sodium	50 mg/L	Monthly basis	-
Mg	50 mg/L	Monthly basis	-
Ca	50 mg/L	Monthly basis	-
K	50 mg/L	Monthly basis	-
Fe	50 mg/L	Monthly basis	Weekly Basis
Ni	1 mg/L	Monthly basis	-
Zn	10 mg/L	Monthly basis	Weekly Basis
Mn	1 mg/L	Monthly basis	-
Cu	1 mg/L	Monthly basis	-
Pb	1 mg/L	Monthly basis	-
Cd	0.2 mg/L	Monthly basis	-
Coliform Count	1 cfu/ 100mL	Monthly basis	Weekly Basis
Oil and Grease	5 mg/L	Monthly basis	-

Surface water flow shall be monitored continuously using automatic data logging equipment. Following periods of heavy rainfall, flow shall be monitored weekly and more frequently to determine peak discharge rates.

5.5.6 Locations of Sampling

Monthly surface water monitoring shall be carried out at specified points WM1 in accordance with Figure 5.1 unless otherwise approved by the IC. The sampling points shall be readily accessible and sampling shall be obtained from a flow that is moderate and steady. Turbulent flowing streams or stagnant polls shall be avoided.

5.5.7 Results

Upon completion of each sampling exercise, the sample containers shall be clearly labelled with site name; sampling location reference; date and time of collection and sample number.

In addition, the sampling technician shall record any abnormality which may affect water quality in their record notebooks. The sampling record shall include the following details:

· Sampling site and sampling point;

· Date and time of collection;

· Name of sampling technician;

· Weather conditions and air temperature;

· Appearance, condition and temperature of the water body;

· Sampling method and sampling device used;

· Sample preservation;

· Storage requirements;

· List of parameters (with space for the analytical results).

5.5.8 Trigger Levels

The DBO Contractor shall conduct the surface water monitoring programme in order to keep ammonia-nitrogen, COD and BOD below the following trigger levels as shown in Table 5.5a:

Table 5.5a Trigger Levels of NH₃-N, COD and BOD

Monitoring Point	Trigger Level (mg/l)
Monitoring Point	NH3-N	COD	BOD
Surface water sampling point	0.5	30	20

5.5.9 Corrective Action

In the event that these trigger levels are exceeded, the DBO Contractor shall implement a Corrective Action Programme, which shall include:

· Sampling upstream into landfill to trace the source;

· Surface water interception and treatment prior to discharge;

· Changes to working methods to prevent surface water contamination;

· Diversionary works.

Where analytical results indicate the presence of contamination, additional monitoring locations shall be selected to determine the pollution source. The DBO Contractor shall implement procedures in accordance with the corrective action plan to mitigate any contamination sources identified, or discharge the surface water to the leachate treatment plant.

5.6 Event and Action Plan

The Action and Limit levels for surface and ground water quality are defined in Table 5.6 and Table 5.7. Should non-compliance of the criteria occur, action in accordance with the Action Plan in Table 5.8 shall be carried out.

Table 5.6 Action and Limit Levels for Surface Water Quality

Parameters		Action	Limit
Construction	DO in mg L^-1 (Surface, Middle & Bottom)	Surface and Middle 5 percentile of baseline data for surface and middle layer Bottom 5 percentile of baseline data for bottom layer	Surface and Middle 4 mg L^-1 or 1%-ile of baseline data for surface and middle layer Bottom 2 mg L^-1 or 1%-ile of baseline data for bottom layer
Construction	pH (depth averaged), Turbidity in NTU (depth-averaged), SS in mg L^-1 (depth-averaged)	95 percentile of baseline data or 120% of upstream control station's pH, Turbidity, SS at the same tide of the same day	99 percentile of baseline or 130% of upstream control station's pH, Turbidity, SS at the same tide of the same day
Operation	BOD, COD, Ammonia-nitrogen	---	Ammonia-nitrogen: 0.5mg/L COD: 30 mg/L BOD: 20 mg/L
Operation	SS in mg L^-1	---	20mg/L

Notes: 1. "depth-averaged" is calculated by taking the arithmetic means of reading of all three depths.

2. For DO, non-compliance of the water quality limits occurs when monitoring result is lower than the limits.

3. For turbidity, SS, Ammonia-nitrogen, COD, non-compliance of the water quality limits occurs when monitoring result is higher than the limits.

4. For pH, non-compliance of the water quality limits occurs when monitoring result is outside the specified range.

5. All the figures given in the table are used for reference only and the EPD may amend the figures whenever it is considered as necessary.

Table 5.7 Action and Limit Levels for Ground Water Quality

Parameters	Action	Limit	Remark
BOD, COD, Ammonia-nitrogen	---	BOD: 5 mg/L COD: 20 mg/L Ammonia-nitrogen: 0.5mg/L	For COD, Ammonia-nitrogen, non-compliance of the water quality limits occurs when monitoring result is higher than the limits.

Parameters

Action

Limit

Remark

BOD, COD,

Ammonia-nitrogen

---

BOD: 5 mg/L

COD: 20 mg/L

Ammonia-nitrogen: 0.5mg/L

For COD, Ammonia-nitrogen, non-compliance of the water quality limits occurs when monitoring result is higher than the limits.

Table 5.8 Event and Action Plan for Water Quality

Event	ET	IEC	IC	DBO Contractor
Action level being exceeded by one sampling day	Identify source(s) of impact; Inform IEC, DBO contractor; Check monitoring data, all plant, equipment and DBO Contractor's working methods. Repeat measurement on next day of exceedance.	Check monitoring data and DBO Contractor’s working methods.	Confirm receipt of notification of non-compliance in writing; Notify Contractor.	Rectify unacceptable practice; Amend working methods if appropriate.
Action level being exceeded by two or more consecutive sampling days	Identify source(s) of impact; Inform IEC, DBO contractor; Check monitoring data, all plant, equipment and Contractor's working methods; Discuss mitigation measures with IEC, IC and Contractor; Ensure mitigation measures are implemented; Increase the monitoring frequency to daily until no exceedance of Action level; Repeat measurement on next day of exceedance.	Check monitoring data and DBO Contractor’s working method; Discuss with ET and DBO Contractor on possible remedial actions; Review the proposed mitigation measures; Supervise the implementation of mitigation measures.	Discuss with IEC on the proposed mitigation measures; Ensure mitigation measures are properly implemented; Assess the effectiveness of the implemented mitigation measures.	Rectify unacceptable practice; Check all plant and equipment and consider changes of working methods; Submit proposal of additional mitigation measures to IEC within 3 working days of notification; Implement the agreed mitigation measures.
Limit level being exceeded by one sampling day	Identify source(s) of impact; Inform IEC, IC and DBO contractor; Check monitoring data, all plant, equipment and Contractor's working methods; Discuss mitigation measures with IEC, IC and Contractor; Ensure mitigation measures are implemented; Increase the monitoring frequency to daily until no exceedance of Limit level;	Check monitoring data submitted by ET and Contractor’s working method; Discuss with ET and Contractor on possible remedial actions; Review the proposed mitigation measures submitted by Contractor and advise the IC accordingly.	Confirm receipt of notification of failure in writing; Discuss with IEC, ET and Contractor on the proposed mitigation measures; Request Contractor to review the working methods.	Take immediate corrective actions to avoid further exceedance; Submit proposal of mitigation measures to IEC within 3 working days; Implement the agreed mitigation measures; Submit further mitigation measures if problem still not under control;
Limit level being exceeded by two or more consecutive sampling days	Identify source(s) of impact; Inform IEC, IC, EPD Check monitoring data, all plant, equipment and Contractor's working methods; Discuss mitigation measures with IEC, ICR and Contractor; Ensure mitigation measures are implemented; Ensure mitigation measures are implemented; Increase the monitoring frequency to daily until no exceedance of Limit level for two consecutive days;	Check monitoring data submitted by ET and Contractor’s working method; Discuss with ET and Contractor on possible remedial actions; Review the Contractor’s mitigation measures whenever necessary to assure their effectiveness; Supervise the implementation of mitigation measures.	Discuss with IEC, ET and Contractor on the proposed mitigation measures; Request Contractor to critically review the working methods; Make agreement on the mitigation measures and ensure mitigation measures are properly implemented; Consider and instruct, if necessary, to slow down or stop that activity of work until exceedance is abated.	Take immediate corrective actions to avoid further exceedance; Submit proposal of mitigation measures to IEC within 3 working days; Implement the agreed mitigation measures; Resubmit proposals if problem still not under control; Slow down or to stop relevant activity until exceedance is abated.

Event

IEC

DBO Contractor

Action level being exceeded by one sampling day

Identify source(s) of impact;

Inform IEC, DBO contractor;

Check monitoring data, all plant, equipment and DBO Contractor's working methods.

Repeat measurement on next day of exceedance.

Check monitoring data and DBO Contractor’s working methods.

Confirm receipt of notification of non-compliance in writing;

Notify Contractor.

Rectify unacceptable practice;

Amend working methods if appropriate.

Action level being exceeded by two or more consecutive sampling days

Identify source(s) of impact;

Inform IEC, DBO contractor;

Check monitoring data, all plant, equipment and Contractor's working methods;

Discuss mitigation measures with IEC, IC and Contractor;

Ensure mitigation measures are implemented;

Increase the monitoring frequency to daily until no exceedance of Action level;

Repeat measurement on next day of exceedance.

Check monitoring data and DBO Contractor’s working method;

Discuss with ET and DBO Contractor on possible remedial actions;

Review the proposed mitigation measures;

Supervise the implementation of mitigation measures.

Discuss with IEC on the proposed mitigation measures;

Ensure mitigation measures are properly implemented;

Assess the effectiveness of the implemented mitigation measures.

Rectify unacceptable practice;

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

Submit proposal of additional mitigation measures to IEC within 3 working days of notification;

Implement the agreed mitigation measures.

Limit level being exceeded by one sampling day

Identify source(s) of impact;

Inform IEC, IC and DBO contractor;

Check monitoring data, all plant, equipment and Contractor's working methods;

Discuss mitigation measures with IEC, IC and Contractor;

Ensure mitigation measures are implemented;

Increase the monitoring frequency to daily until no exceedance of Limit level;

Check monitoring data submitted by ET and Contractor’s working method;

Discuss with ET and Contractor on possible remedial actions;

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

Confirm receipt of notification of failure in writing;

Discuss with IEC, ET and Contractor on the proposed mitigation measures;

Request Contractor to review the working methods.

Take immediate corrective actions to avoid further exceedance;

Submit proposal of mitigation measures to IEC within 3 working days;

Implement the agreed mitigation measures;

Submit further mitigation measures if problem still not under control;

Limit level being exceeded by two or more consecutive sampling days

Identify source(s) of impact;

Inform IEC, IC, EPD

Check monitoring data, all plant, equipment and Contractor's working methods;

Discuss mitigation measures with IEC, ICR and Contractor;

Ensure mitigation measures are implemented;

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

Check monitoring data submitted by ET and Contractor’s working method;

Discuss with ET and Contractor on possible remedial actions;

Review the Contractor’s mitigation measures whenever necessary to assure their effectiveness;

Supervise the implementation of mitigation measures.

Discuss with IEC, ET and Contractor on the proposed mitigation measures;

Request Contractor to critically review the working methods;

Make agreement on the mitigation measures and ensure mitigation measures are properly implemented;

Consider and instruct, if necessary, to slow down or stop that activity of work until exceedance is abated.

Take immediate corrective actions to avoid further exceedance;

Submit proposal of mitigation measures to IEC within 3 working days;

Implement the agreed mitigation measures;

Resubmit proposals if problem still not under control;

Slow down or to stop relevant activity until exceedance is abated.

6 Waste Management

6.1 Introduction

It will be the DBO Contractor’s responsibility to ensure that all wastes produced during the WENT Landfill Extension are handled, stored and disposed of in accordance with good waste management practices and EPD’s regulations and requirements.

The major waste material generated during construction activities has been identified to be construction and demolition (C&D) material and recommended to be audited at regular intervals (at least weekly) to ensure that proper storage, transportation and disposal practices, if necessary, will be implemented.

Monitoring of waste management practices will ensure that these solid wastes generated during construction will not be disposed of at the nearby coastal waters. The DBO Contractor will be responsible for the implementation of any mitigation measures to minimise waste or redress problems arising from the waste materials.

6.2 Waste Control and Mitigation Measures

Construction and Operation Phases

Mitigation measures for waste management are summarised below. With the appropriate handling, storage and removal of waste arisings during the construction phase as defined below, the potential to cause adverse environmental impacts would be minimised. The EMIS of the recommended mitigation measures is presented in Appendix C4.

Good Site Practices and Waste Reduction Measures

It is expected that adverse impacts from waste management would not arise, provided that good site practices are strictly followed. Recommendations for good site practices during construction include:

· Nomination of approved personnel to be responsible for good site practices and making arrangements for collection of all wastes generated on-site and effective disposal;

· Training of site personnel for cleanliness, proper waste management procedures including chemical waste handling, and waste reduction, reuse and recycling concepts;

· Provision of sufficient waste collection points and regular collection for disposal;

· Appropriate measures to minimise windblown litter and dust during transportation of waste by either covering trucks or by transporting wastes in enclosed containers;

· Regular cleaning and maintenance programme for drainage systems, sumps and oil interceptors;

· Appropriate waste management should be implemented in accordance with the ETWB TC(W) No 19/2005; and

· Recording system for the amount of wastes generated, recycled and disposed (including the disposal sites), if necessary, should be proposed.

A trip-ticket system should be implemented in accordance with WBTC No 31/2004 for proper record of the quantity of C&D material generated on-site. Construction Waste Disposal Charging Scheme under the Waste Disposal Ordinance also applies to control the disposal of construction waste. Good management and control will prevent the generation of significant amounts of waste.

Waste reduction is best achieved at the planning and design stage, as well as by ensuring the implementation of good site practices. Recommendations include:

· Segregation and storage of different types of waste in different containers, skips or stockpiles to enhance reuse or recycling of materials and their proper disposal;

· Separate labelled bins should be provided to segregate aluminium cans from other general refuse generated by the work force and to encourage collection of aluminium cans by individual collectors;

· Any unused chemicals or those with remaining functional capacity should be recycled;

· Maximising the use of reusable steel formwork to reduce the amount of C&D material;

· Prior to disposal of C&D waste, it is recommended that wood, steel and other metals should be separated for re-use and/or recycling to minimise the quantity of waste to be disposed of to landfill;

· Proper storage and site practices should be implemented to minimise the potential for damage or contamination of construction materials;

· Plan and stock construction materials carefully to minimise amount of waste generated and avoid unnecessary generation of waste; and

· Minimise excessive ordering of concrete, mortars and cement grout by doing careful check before ordering.

In addition, specific mitigation measures are recommended below for the identified waste arisings to minimise environmental impacts during handling, transportation and disposal of these wastes, if necessary.

C&D Material

As the design has adopted a C&D material balance approach, the impact on the handling, collection, transportation and disposal of C&D material is insignificant. Excavated slope, stockpiled material and bund walls will be covered (e.g. by a tarpaulin) until used in order to prevent wind-blown dust during dry weather, and to reduce muddy runoff during wet weather. If any topsoil-like materials need to be stockpiled for any length of time, consideration should be given to hydroseeding of the topsoil on the stockpile to improve its visual appearance and prevent soil erosion.

Chemical Wastes

Plant/ equipment maintenance schedule should be designed to optimise maintenance effectiveness and to minimise the generation of chemical wastes. Chemical waste should be properly stored and transported off-site for treatment by a licensed collector. The DBO Contractor should register with EPD as a chemical waste producer. Where possible, chemical wastes (e.g. waste lube oil) should be recycled by licensed treatment facilities.

General Refuse

All recyclable materials (separated from the general waste) should be stored on-site in appropriate containers with cover prior to collection by a local recycler for subsequent reuse and recycling. Residual, non-recyclable, general waste should be stored in appropriate containers to avoid odour. Regular collection should be arranged by an approved waste collector in purpose-built vehicles that minimise environmental impacts during transportation.

Sludge

Sludge from the leachate treatment plant for the existing WENT Landfill and its extension will be transported to the STF for treatment.

Restoration and Aftercare Phases

Chemical Wastes

With the implementation of proper preventive and mitigation measures similar to the construction management approach for the handling, transport and disposal of chemical waste, no insurmountable environmental impact is anticipated during the restoration and aftercare phases.

General Refuse

With the implementation of proper preventive and mitigation measures similar to the construction management approach for the handling, transport and disposal of general refuse, no insurmountable environmental impact is anticipated during the restoration and aftercare phases.

Sludge

With the implementation of proper preventive and mitigation measures similar to the construction management approach for the handling, transport and disposal of sludge, no insurmountable environmental impact is anticipated during the restoration and aftercare phases.

7 Landfill Gas Monitoring

7.1 Background

The qualitative risk assessment for landfill gas (LFG) hazards associated with the construction, operation, restoration and aftercare phases indicated that the overall risks to the receivers within the WENT Landfill Extension site was categorised as “Medium” to “High” and that to the receivers outside the WENT Landfill Extension site was “Low” to “Medium”.

The sensitive receivers falling within the newly proposed 250m Consultation Zone may be prone to LFG potential risk and appropriate protective and precautionary measures including engineering design and monitoring programme have been proposed to reduce such risk to acceptable levels. With these measures in place, no adverse impact is anticipated. LFG monitoring should be conducted throughout various phases of WENT Landfill Extension with the following key objectives:

· To ensure the safety and health of workers during the construction stage of WENT Landfill Extension;

· To determine the performance and effectiveness of LFG mitigation measures and control systems for preventing uncontrolled LFG migration, with respect to the LFG risk on properties, residents and vegetation;

· To establish a system for assessment and monitoring of any potential ecological stress in the vicinities of the site;

· To establish a monitoring regime for buildings within the site services routes and other enclosed areas providing a warning system for detection of potential build-up of hazardous LFG; and

· To ascertain the characteristics of the landfill and estimate the quantity and quality of the LFG production in order to assess the potential for future utilisation.

This EM&A Manual specifies the basic requirements for LFG monitoring in WENT Landfill Extension, including the monitoring locations, parameters, equipment, procedures, frequency, reporting format, A/L Levels, EAP and ECP, etc. Further details of LFG monitoring requirements should be established in the LMP to be developed by the future DBO Contractor based on this EM&A Manual.

7.2 General Requirements

The LFG monitoring programme should include on-site and off-site monitoring at the agreed period of time and frequency. On-site and off-site LFG monitoring during different phases of landfill development should cover:

· Quantity and quality of extracted LFG at individual gas well heads;

· Quantity of LFG automatically monitored at LFG pumping station;

· Fixed surface and borehole locations along the landfill site boundary and at potential sources of concern;

· Monitoring safe level of LFG concentration, and implementation of sufficient mitigation measures when entering confined spaces within the landfill site; and

· Off-site monitoring for LFG.

LFG monitoring should be conducted in monthly basis at designated monitoring locations and gas monitoring boreholes, supplemented by monthly site surveys of the surrounding environment including natural cracks and fissures, service drains and ducts, area with sign of vegetation death, and any below ground enclosed spaces, which include normal bulk gas using portable instrument verified by gas sampling and laboratory analyses. If the monitoring results indicate evidence of gas migration, the monitoring frequency should be increased accordingly, with the implementation of appropriate mitigation measures under the EAP.

LFG monitoring should commence at the start of construction works through the operation, restoration and until completion of aftercare phases. The measured LFG results should be checked for compliance against pre-defined A/L Levels in this EM&A Manual and the LMP. In case exceedance of compliance level was detected at any locations, the EAP should be triggered for necessary action to be taken.

If abnormally high LFG levels are detected at off-site sensitive receivers, the ECP should be strictly followed to timely trigger the listed action without delay, which includes evacuation of occupants, provision of forced ventilation to the concerned sensitive receiver, investigation of potential source of LFG, increase LFG extraction rate on-site for minimise leakage etc. Details of the procedures will be documented in the ECP.

7.3 Monitoring Parameters

A suite of LFG monitoring parameters include:

· Monitoring borehole:	Methane (CH₄), carbon dioxide (CO₂), oxygen (O₂), flammable gas
· Surface gas location:	CH₄, CO₂, O₂
· Gas well head:	CH₄, CO₂, O₂, flammable gas, volatile organic compounds (VOC)
· Off-site location:	VOC

7.4 Monitoring Equipment

Monitoring for Construction Works

Intrinsically safe portable gas detectors should be used during excavation or when working in any confined spaces, which have the potential for presence of LFG and risk of explosion or asphyxiation. The monitoring equipment should alarm, both audibly and visually, when the concentrations of the following gases were exceeded:

· CH₄: > 10% of the Lower Explosion Limit (LEL);

· CO₂: > 0.5% by volume; and

· O₂: < 19% by volume

Monitoring at Designated Locations

Pre-entry and routine monitoring should be conducted at boreholes, gas well heads, utilities’ manholes and chambers throughout the WENT Landfill Extension development. The LFG monitoring should be conducted regularly. The LFG monitoring instrument should:

· Comply with EPD’s Landfill Gas Hazard Assessment – Guidance Note as intrinsically safe;

· Be capable of continuous monitoring of CH₄, CO₂, O₂, barometric pressure and gas pressure measurement;

· Normally operate in diffusion mode unless required for spot sampling, when it should be capable of operating by means of an aspirator or pump;

· Have low battery, fault and over range indication incorporated;

· Store monitoring date and be capable of being down-loaded directly; and

· Measure within these ranges: methane 0-100% LEL & 0-100% v/v; oxygen 0-25% v/v; carbon dioxide 0-100% v/v; barometric pressure mBar (absolute); gas pressure (relative to atmosphere) pascals; and temperature 0-100°C.

Proper gas sampling devices such as stainless steel gas cylinders or Tedlar bags should be used for collection of ambient gas samples at specified surface and off-site locations and delivered to laboratory for testing using gas chromatography analysis.

All buildings within the WENT Landfill Extension site should be monitored for the presence of LFG with a permanent detection system with the following features:

· Detector heads to be located within buildings;

· Main control box which houses individual control devices for each detector head;

· Central control panel to alert site personnel, audibly and visually, when gas concentration reached or exceeded threshold levels; and

· Dial-out facility to enable appropriate personnel to be alerted if detectors are triggered outside operation hours.

Calibration and Maintenance

All portable instrument should be calibrated and serviced according to the manufacturer’s instructions. Calibration gases should be used for checking portable instrument for methane and carbon dioxide detection before and after use. Instrument for monitoring oxygen should be calibrated against normal expected air concentrations. Any significant variations in instrument performance outside that expected through normal drift should be noted with the instrument calibration timely corrected.

7.5 Monitoring Locations

During the construction works within the WENT Landfill Extension site with excavation of 1m deep or more, LFG concentrations should be monitored before entry and periodically during the progress of works. If drilling is required, the procedures for safety management and working procedures as stipulated in EPD’s Landfill Gas Hazard Assessment – Guidance Note should be strictly adopted.

Throughout the WENT Landfill Extension development, when service voids, manholes or inspection chambers within the project site are entered for maintenance, monitoring and a checklist system of safety requirements should be performed before entry in accordance with the Code of Practice on Safety and Health at Work in Confined Spaces.

The proposed LFG monitoring locations including designated boreholes and surface locations, gas wells, and off-site locations for WENT Landfill Extension development are shown in Figure 5.1, which are subject to changes depending on the design and modification by the future DBO Contractor. Detailed requirements of LFG monitoring should be established in the LMP by the DBO Contractor.

7.6 Monitoring Frequency

If the monitoring results indicate evidence of gas migration, the monitoring frequency should be increased accordingly, with the implementation of appropriate mitigation measures under the EAP.

The monitoring frequency should be reviewed throughout the on-going development of WENT Landfill Extension and revised as necessary based on the LFG monitoring data. Detailed requirements of LFG monitoring frequency should be established in the LMP by the DBO Contractor.

7.7 Monitoring Procedures

Surface Gas Emission

· Walkover survey for the whole site area should be undertaken at a slow pace with the inlet tube of the probe only a few centimeters above ground level.

· Measurements will be taken in areas off-site and/or beyond the landfill boundary where there is visible vegetation stress or die-back which may be caused by depletion of soil oxygen and accumulation of toxic gases or vapors in the root zone.

· Survey of the capping, focusing upon cracks or areas of settlement, surface drains, sub-surface service entries to buildings and any other enclosed spaces should be taken.

Monitoring Borehole

· The sampling port should be connected to the gas monitoring probe.

· The gas analyser should be turned on to sample the gas for about one minute.

· The sampling port should be removed and the temperature probe should be inserted into the gas monitoring probe to record the temperature.

· Results should be recorded on a log sheet.

· Pressure (within installations, relative to atmospheric pressure) should be monitored at any monitoring probe where methane was detected on the previous monitoring occasion. The order of monitoring should be pressure, followed by flammable gas (CH₄), O₂, CO₂ and temperature.

· Bulk samples of LFG should be drawn from gas monitoring probes with tubing connected directly to a 10L Tedlar bag and sent for laboratory analysis.

Well Head

· Proper hoses should be connected from the GEM-500 to the wellhead.

· Black striped Tygon hose with the external filter/water trap assembly should be attached to the static port on the GEM-500.

· Almond-coloured male quick connect should be placed on the end of this tubing to read the static pressure on the Accu-Flo wellhead.

· Clear Tygon hose should be connected to the impact port of the GEM-500. A chrome plated brass male fitting should be placed on the end of the clear tubing. This chrome fitting should be used to measure the impact pressure at the wellhead.

· Gas analyser should be turned on and gas should be sampled for 60 seconds.

· Results should be recorded on a log sheet.

· Pressure (within installations, relative to atmospheric pressure) should be monitored at any monitoring probe where CH₄ was present on the previous monitoring occasion. The order of monitoring will be pressure, followed by flammable gas (CH₄), O₂, CO₂ and temperature.

· Bulk samples of LFG should be drawn from gas monitoring probes with tubing connected directly to a 10L Tedlar bag and sent for laboratory analysis for all listed VOCs.

Site Building and Confined Space

· Permanent gas detection system should be installed at each on-site building for the continuous and automatic monitoring of gas ingress into the building.

· The effectiveness of the system will further be monitored by inspection of main gas detector panel every 4 hours; inspection of air inlets to ensure no blockages, daily; and monitoring of all maintenance holes, ducts and confined spaces both inside and within close proximity to the Landfill Site Boundary for flammable gas and carbon dioxide, monthly.

· The gas detection system will be set for alarm (audible and visual) if

§ CH₄: > 10% of the Lower Explosion Limit (LEL);

§ CO₂: > 0.5% by volume; and

§ O₂: < 19% by volume

Off-site Location

VOCs

· A sample list of VOC monitoring parameter is listed in Appendix D.

· Prior to sampling, the sampler should be attached to the canister by tubing.

· The canister valve should be opened and the canister pressure gauge should be recorded.

· Ambient air should be pumped into the canister by the sampler’s diaphragm pump. The flow rate should be maintained at about 67mL/min for 3 hours in order to fill the 6L canister to 2 atm. The system timer should be programmed to activate and deactivate the sample collection.

· After sampling, the canister valve should be closed and the final sample pressure should be recorded on the sampling data sheet.

· Monitoring for VOCs should not be carried out if it is raining.

CH₄

· A sample-collecting air bag should be situated within an airtight drum. The bag should be opened to the atmosphere and a vacuum should be applied to the inside of the drum by means of a vacuum pump. The negative pressure causes the air bag to inflate, drawing in an atmospheric air sample. The bag should then be sealed immediately.

· Sample containers should be labeled and delivered to the accredited laboratory as soon as is practicable.

7.8 A/L Levels and EAP

The A/L Levels and relevant EAP for LFG detected in excavation, utilities and enclosed on-site areas are summarised in Table 7.1.

Table 7.1 A/L Levels and EAP for LFG

Parameter	Level	Action
Oxygen (O₂)	Action Level <19% O₂	Ventilate trench/void to restore O₂ to >19%
Oxygen (O₂)	Limit Level <18% O₂	Stop works Evacuate personnel/prohibit entry Increase ventilation to restore O₂ to >19%
Methane (CH₄)	Action Level >10% LEL*	Prohibit hot works Increase ventilation to restore CH₄ to <10% LEL
Methane (CH₄)	Limit Level >20% LEL	Stop works Evacuate personnel/prohibit entry Increase ventilation to restore CH₄ to<10% LEL
Carbon dioxide (CO₂)	Action Level >0.5% CO₂	Ventilate to restore CO₂ to < 0.5%
Carbon dioxide (CO₂)	Limit Level >1.5% CO₂	Stop works Evacuate personnel / prohibit entry Increase ventilation to restore CO₂ to <0.5%

* LEL: Lower Explosive Limit – concentrations in air below which there is not enough fuel to continue an explosion.

** This Action Level of CO₂ at 0.5% is set for reference only, assuming no CO₂ emission from a particular location. Depending on the baseline CO₂ levels, the Action Level at a particular location will be changed.

VOC monitoring results will be evaluated against the limit levels as defined as WHO/USEPA/CARB’s ambient criteria if available or the odour thresholds or 1% of Occupational Exposure Limit (OEL) as stipulated in the “UK Health and Safety Executive (HSE) EH 40/05 Occupational Exposure Limits” whichever is lower. In case of exceedance of the limit levels, more frequent monitoring, as specified in the EAP (see Table 7.2) should be conducted. This additional monitoring should be continued until the non-compliance is rectified.

Table 7.2 EAP for VOC

Event	ET Leader	IEC	IC	DBO Contractor
Limit level being exceeded for VOCs at the monitoring locations	· Identify source(s) and investigate the cause(s) of exceedance · Inform IEC, IC, Project Proponent and Contractor whether the cause of exceedance is due to the Project · Prepare the Notification of Exceedance within 24 hours · Repeat measurement to confirm finding · Increase monitoring frequency to monthly · Discuss remedial actions with the IEC and the Contractor · Assess effectiveness of Contractor's remedial actions and keep the Project Proponent, IC, IEC informed of the results	· Verify the Notification of Exceedance submitted by the ET Leader · Check with Contractor on the operating activities and implementation of landfill gas control measures · Discuss with ET Leader and Contractor on the possible remedial actions · Advise the IC on the effectiveness of the proposed remedial measures · Supervise implementation of remedial measures	· Confirm receipt of notification of exceedance in writing · Require Contractor to propose remedial measures, if necessary · Ensure remedial measures are properly implemented	· Rectify any unacceptable practice; · Amend working methods as required · Implement amended working methods, if necessary

Event

ET Leader

IEC

DBO Contractor

Limit level being exceeded for VOCs at the monitoring locations

· Identify source(s) and investigate the cause(s) of exceedance

· Inform IEC, IC, Project Proponent and Contractor whether the cause of exceedance is due to the Project

· Prepare the Notification of Exceedance within 24 hours

· Repeat measurement to confirm finding

· Increase monitoring frequency to monthly

· Discuss remedial actions with the IEC and the Contractor

· Assess effectiveness of Contractor's remedial actions and keep the Project Proponent, IC, IEC informed of the results

· Verify the Notification of Exceedance submitted by the ET Leader

· Check with Contractor on the operating activities and implementation of landfill gas control measures

· Discuss with ET Leader and Contractor on the possible remedial actions

· Advise the IC on the effectiveness of the proposed remedial measures

· Supervise implementation of remedial measures

· Confirm receipt of notification of exceedance in writing

· Require Contractor to propose remedial measures, if necessary

· Ensure remedial measures are properly implemented

· Rectify any unacceptable practice;

· Amend working methods as required

· Implement amended working methods, if necessary

7.9 Mitigation Measures

The protection and precautionary measures to minimise LFG hazards for the areas within and outside the WENT Landfill Extension site during construction, operation, restoration and aftercare phases are summarised in the EMIS in Appendix C5.

Due to the close proximity to the existing WENT Landfill site, the mitigation measures within WENT Landfill Extension site generally encompass specific protection against hazards of exposure to LFG e.g. ignition, explosion, asphyxiation, toxicity, etc when undertaking construction activities including excavation and trenching.

During operation, restoration and aftercare phases, due care for strict implementation protection measures should be taken when operations within service voids, manholes and inspection chambers need to be exercised within the WENT Landfill Extension site. All new-built permanent building structures within the WENT Landfill Extension site should be installed with specific gas protection measures.

8 Landscape and Visual Monitoring

8.1 Introduction

The EIA study has recommended landscape and visual mitigation measures to be undertaken during the construction and operation phases, as well as the restoration and aftercare phases of the project. This section outlines the EM&A requirements of these measures to mitigate the landscape and visual impacts. An EMIS of the recommended mitigation measures is presented in Appendix C6.

8.2 Monitoring Details

The design, implementation and maintenance of landscape and visual mitigation measures should be checked to ensure that they are fully implemented and that potential conflicts between the proposed landscape measures and other works and operation requirements are timely resolved without compromise to the intention of the proposed mitigation measures.

Baseline Monitoring

Photographic records of the project site should be taken at the time when the DBO Contractor take over the site, which should be approved by the IC. The approved photographic records should be submitted to the Project Proponent, ET, IEC and EPD.

Monitoring Locations and Frequency

In order to monitor the landscape and visual impact after providing mitigation measures effectively, all the specified and affected landscape character areas, landscape resources and visually sensitive receivers should be monitored. Photographical records should be taken for the monitoring locations monthly from the commencement of works. Those records are recommended to be stated in the Specification and DBO Contractor’s monthly progress report.

Design Phase

The mitigation measures proposed in the EIA study to mitigate the landscape and visual impacts should be embodied into the detailed engineering design and landscape design drawings and contract documents. Designs should be checked to ensure that the mitigation measures are fully incorporated and that potential conflicts with civil, geo-technical, structural, drainage, underground utilities and operation requirements are resolved prior to construction and operation of the project. The DBO Contractor should develop a detailded management programme to mitigate the landscape and visual impacts.

Construction and Operation Phases

Measures to mitigate the landscape and visual impacts during the construction and operation phases should be checked to ensure compliance with the intended aims of the measures. The progress of the engineering works should be regularly reviewed on site to identify the earliest practical opportunities for the landscape works to be undertaken. The event and action plan for landscape and visual monitoring during the construction and operation phases is summarised in Table 8.1.

Restoration and Aftercare Phases

Measures to mitigate landscape and visual impacts during the restoration and aftercare phases should be checked to ensure compliance with the intended aims of the measures. The success of all planting works intended to mitigate the visual and landscape impact should be monitored, including long-term maintenance of the restoration planting works under the detailed management programme. The event and action plan for landscape and visual monitoring during the restoration and aftercare phases is summarised in Table 8.2.

Table 8.1 Summary of event and action plan for landscape and visual monitoring during construction and operation phases

	ET	IEC	IC	DBO Contractor
Design checking	· Check final design conforms to the requirements of EP and prepare report	· Check report. · Recommend remedial design if necessary	· Undertake remedial design if necessary	· Ensure compliance with EP requirements
Exceedance on one occasion	· Identify source of impact · Inform IEC and IC · Discuss remedial actions with IEC, IC and DBO Contractor · Monitor remedial actions until rectification has been completed	· Check report · Check DBO Contractor's working method · Discuss with ET and DBO Contractor on possible remedial measures · Advise IC on effectiveness of proposed remedial measures · Check implementation of remedial measures	· Notify DBO Contractor · Ensure remedial measures are properly implemented	· Amend working methods · Rectify damage and undertake any necessary replacement
Repeated Exceedance(s)	· Identify source of impact · Inform IEC and IC · Increase monitoring frequency · Discuss remedial actions with IEC, IC and DBO Contractor · Monitor remedial actions until rectification has been completed · If exceedance stops, cease additional monitoring	· Check monitoring report · Check DBO Contractor's working method · Discuss with ET and DBO Contractor on possible remedial measures · Advise IC on effectiveness of proposed remedial measures · Supervise implementation of remedial measures	· Notify DBO Contractor · Ensure remedial measures are properly implemented	· Amend working methods · Rectify damage and undertake any necessary replacement

Table 8.2 Summary of event and action plan for landscape and visual monitoring during restoration and aftercare phases

	Maintenance Agency	Management Agency
Exceedance	· Identify source of impact · Discuss remedial actions with Management Agency. · Monitor remedial actions until rectification has been completed.	· Check report. · Discuss with Maintenance Agency possible remedial measures. · Supervise implementation of remedial measures.

Maintenance Agency

Management Agency

Exceedance

· Identify source of impact

· Discuss remedial actions with Management Agency.

· Monitor remedial actions until rectification has been completed.

· Check report.

· Discuss with Maintenance Agency possible remedial measures.

· Supervise implementation of remedial measures.

9 Cultural Heritage Monitoring

9.1 Introduction

Built heritage survey and archaeological survey have been conducted within the study area of the WENT Landfill Extension. During the built heritage survey, the Hung-Shing and Dragon Mother Temple (Hung-Shing Temple) was investigated for its dating and heritage value, and nine graves were investigated for their dating and current status. During the archaeological survey, 15 test pits and 24 auger holes were excavated in the confined study area on the Government land within the identified boundary of the Tsang Tsui Archaeological Site (TTAS). The EIA study has recommended the archaeological and built heritage mitigation measures arising from the WENT Landfill Extension project. This section outlines the specific EM&A requirements of these measures. An EMIS of the recommended mitigation measures is presented in Appendix C7.

9.2 Built Heritage Monitoring

The Hung-Shing Temple was completely rebuilt in 1988, and two graves have been rebuilt in the past two decades; therefore, the cultural heritage value of these structures is relatively low. Before the relocation of these structures, it is unnecessary to take further mitigation measures on the two graves; the Hung-Shing Temple, however, should be duly surveyed for record purpose prior to the relocation.

9.3 Archaeological Monitoring

The original boundary of the TTAS has been revised based on the discovery of the 2008 survey. Since the WENT Landfill Extension would cover the area of the TTAS, a rescue excavation shall be conducted before the commencement of the construction. Subject to the findings of an additional archaeological survey, the rescue excavation shall cover the revised site boundary in order to protect the potential archaeological heritage of the TTAS comprehensively in record.

The project proponent shall appoint a qualified and experienced archaeologist to carry out the additional archaeological survey and rescue excavation. The archaeologist shall apply for a licence for carrying out the survey and rescue excavation. A separate Archaeological Action Plan following relevant parts of the Guidelines for Cultural Heritage Impact Assessment shall be prepared by the archaeologist detailing the archaeological actions required to mitigate impacted archaeological deposits in Tsang Tsui Archaeological Site. The plan shall include the following:

a. a detailed plan for the additional archaeological survey;

b. a detailed plan for the rescue excavation;

c. a contingency plan to address possible arrangement when significant archaeological findings are unearthed.

The project proponent shall allow sufficient funding, time and personnel to implement the plan prior to commencement of construction work. The Archaeological Action Plan shall be submitted and agreed with AMO prior to licence application by the archaeologist. As Tsang Tsui Archaeological Site is an important archaeological site in Hong Kong, all the archaeological works for the site shall be conducted by qualified and experienced archaeologists. The contractual arrangement (including the contract brief) for the archaeological survey and rescue excavation shall be agreed with AMO prior to engagement of archaeologists.

9.4 AMO requirements for Photographic and Cartographic Survey for the Temple

9.4.1 Requirements for Photographic Survey

A. All the photographic recording must be done in both colour slides and in digital format (of at least 6.0 mega pixels of each jpeg image and to be saved in low compression). The following recording is required:

(1) The overall historic site including the sitting of the historic building and its ancillary building(s) and structure(s) together with its/ their immediate surroundings, the general landscape, including important trees, garden details, courtyard details and types of paving.

(2) An aerial-photo (at oblique angle) showing the characteristics of the site.

(3) The exterior and interior of each structure in detail with the following shots, using the appropriate lenses for the task, including perspective correction, macro, wide-angle and telephoto as necessary for the followings:

Exterior

(a) identification view including the surrounding area;

(b) each of the four external elevations [using a perspective correction (PC) lens as appropriate];

(d) close up of the main entrance

(e) details showing eaves, verges and ridges

(f) typical windows

(g) any other architectural details, such as : decorations on the ridges, eaves, gable walls, pediments, windows, doors, roofs, towers, openings, chimneys, foundation stones, commemorative plaques, stone tablets, inscriptions, couplets, etc. (using a macro lens as appropriate)

Interior

(a) interior of each room in the buildings, general view, ceiling and floors; and

(b) close-ups of any other important features, such as: fireplaces, staircases, mechanical features, structural steelwork details, commemorative plaques, stone tablets, inscriptions, couplets, murals, carvings, furnishings, furniture and fittings, etc. (using a macro lens as appropriate)

Construction Details

(a) close-ups of any notable construction details, such as type of brick bonding, different courses of brickwork to each wall, etc; and

(b) images showing building materials used in the construction of the principal elements, e.g. floors, roofs stairs, windows, balconies, etc.

B. All the photographic records shall be projection prints (in 4” x 6” size) and presented with their location plans in an A4-size report properly captioned in both Chinese and English. All the prints should be easily referenced to their location on key drawings and should be numbered and cross-referenced for easy retrieval.

C. All the slides must be properly captioned in both Chinese and English, easily referenced to their location on key drawings and should be numbered and cross-referenced for easy retrieval. Slides should be unmounted (in strips).

D. The following photographic records should be submitted to the Antiquities and Monuments Office (AMO), Leisure and Cultural Services Department, on or before the date specified by / agreed with the AMO AND before any building work on the historic site is commenced:

(1) one full set of original slides (in strips);

(2) two sets of contact prints (in 8x10 proof);

(3) three hardcopies of the Photographic Survey Report (in A4 size or other agreed size not larger than A3 size); and

(4) three softcopies (CD-ROM in approved format) of all the images and the Photographic Survey Report.

9.4.2 Requirements for Cartographic Survey

A. The following measured drawings are required showing the existing condition of the building:

(1) Site plan showing the location of the building to 1:50 with key plan to 1:20,000.

(2) Floor plan(s) showing all structural walls, and original non-structural partitions and built-in fittings to 1:50.

(3) Floor plan(s) of the external areas showing any important features in the courtyard, garden or area adjoining the building to 1:50.

(4) Roof Plan to 1:50.

(5) Axonometric diagrams of the building to 1:50

(6) At least two cross-sections through the building sufficient to show the architectural characteristics of the building to 1:50. The cross-sections have to be agreed with the Antiquities and Monuments Office (AMO).

(7) Elevation of each face of the building to 1:50

(8) Reflected Ceiling Plan to 1:50 showing the roof structure, number of joists, rafters and battens to the roof etc.

(9) Measured drawings of architectural details including but not limited to archways, doorways, porches, windows, beams, roof trusses, pediments, keystones, columns, paving, flooring, fireplaces, panelling, plaster decoration and ornamented features, mouldings, stairs, ramps chimneys, parapets, brick construction patterns, roof ridge decorations, column bases, lintels, boards, screen windows and doors, gable walls, bracket systems, eaves, steps, altars, any decorative feature and any other item of historical or conservation interest to scale 1:10 or 1:5 as appropriate together with location plans showing each architectural feature. All the features should be numbered and listed on a cross-referenced checklist together with the reference number of their photographs (as recorded in the photographic survey) and their location plans and detailed drawings.

(10) Plan, elevation and cross section of any important fittings within the building, particularly relating to its commercial/industrial use, to appropriate scale.

(11) Construction details should be noted, such as type of brick bonding, joints in timbers, joints in granite features, etc, to scale 1:10 or 1:5 as appropriate. The number of courses of brickwork or masonry work to each wall should also be recorded on the appropriate elevation plan(s). This also applies to the detailed drawings of flooring, roof and truss system of the building, such as construction pattern of finish flooring to each floor, number of joists to each floor, rafters and battens to the roof, and etc.

(12) All the plans should have North point.

B. Drawings should be annotated with descriptions of the building materials used in the construction of the principal elements, e.g. floors, roofs, stairs, windows, balconies, etc.

C. THREE full sets of the cartographic drawings (in both hard and soft copies i.e. CD_ROM in .dwg & .dxf format) should be submitted to the AMO of Leisure and Cultural Services Department on or before the date specified by/ agreed with the AMO AND before any building work on the historic site is commenced.

10 Ecological Monitoring

10.1 Introduction

The EIA stipulated that ecological monitoring should be undertaken throughout the design, construction, operation, restoration and aftercare phases of WENT Landfill Extension to ensure that all mitigation measures should be fully complied with. The objectives of design audit for ecology are to ensure that the design for ecological mitigation specified in the EIA Report will be conducted to ensure that such designs are ecologically feasible and effective.

The EM&A objectives for ecology during the construction, operation, restoration and aftercare should be to ensure that the ecological contract works and construction mitigation procedures recommended are carried out as specified and are effective. The construction and operation phase ecological EM&A should be carried out as part of the overall EM&A programme.

The purposes of ecological monitoring and audit are:

· To verify the accuracy of the predictions of the ecological assessment study;

· To detect unpredicted ecological impacts arising from the proposed project;

· To monitor the effectiveness of the mitigation measures; and

· To recommend action plans in response to unpredicted impacts, and/ or failed mitigation

The performance of monitoring and audit from an ecological prospective should be integrated with the overall monitoring and audit plan for the project as a whole. The information on the commencement and programme of the engineering works should enable the ecological monitoring to be prepared with considerations of seasonality factors. An EMIS of the recommended mitigation measures is presented in Appendix C8.

10.2 Ecological Mitigation Measures

Mitigation measures required for the Project to minimise ecological impacts and to preserve ecological resources will be specified in the Environmental Permit. Ecological mitigation measures to be implemented during the construction phase and operation phase include the following:

· Transplantation of three plant species of conservation interest within the project area prior to site clearance. They are Aquilaria sinensis, Nepenthes mirabilis and Arundina graminifolia. Their locations are shown in Figure 10.2 of the EIA report.

· 21 ha of woodland compensatory planting, with 5 ha to be planted on the existing WENT Landfill and the remaining 16 ha to be planted on the WENT Landfill Extension site after restoration phase.

· Creation of 5 ha of freshwater ponds, each with a minimum of 0.5 ha in size, with 3 ha to be constructed on the existing WENT Landfill site and the remaining 16 ha to be planted on the WENT Landfill Extension site after restoration phase, to provide habitats for bird species of conservation concern, including Little Grebe.

· Set up of water quality monitoring stations inside Tai Shui Hang catchment to monitor the conditions of the habitat for the rare freshwater fish, Acrossocheilus parallens.

· Regular site audit and good site practices to avoid encroachment onto the nearby natural habitats and disturbance to wildlife. These are listed in various sections (including air, water, noise, waste sections) of the EIA and the other sections of this EM&A Manual.

Ecological mitigation measures to be implemented before commencement of construction phase should include survey and transplantation of plant species of conservation interest and water quality monitoring stations inside Tai Shui Hang catchment. In addition, although potential impacts to stream loss and fish species of conservation interest are ranked as minor and insignificant and no mitigation is required, a precautionary measure – fish capture and translocation survey for the three fish species of conservation interest including Squaliobarbus curriculus, Osteochilus vittatus and Kuhlia marginata will also be implemented before site clearance.

The 3 ha of freshwater pond habitat on existing WENT Landfill should be constructed before demolition of the middle ash lagoon during the last phase of WENT Landfill Extension. planting of 5 ha of woodland will be implemented on the existing WENT Landfill site after the restoration phase and completed before the complete loss of woodland in the last phase of the WENT Landfill Extension to ensure continuous of provision of woodland habitat in the study area .

Ecological mitigation measures to be implemented after restoration phase of the WENT Landfill Extension should include creation of the remaining 2 ha of freshwater pond habitat and 16 ha of woodland compensatory planting and monitoring.

The objective of creation of freshwater pond habitat is to mitigate for loss of ash lagoon habitat for Little Grebe. The conceptual design and layout should follow the mitigation measures specified in Section 10 of the EIA Report.

To evaluate the effectiveness of the mitigation measures, a 3-year monthly ecological monitoring during the major breeding season from March to August is proposed upon completion of pond construction. Breeding activities of Little Grebe will be monitored and evaluated.

The objective of compensatory planting is to mitigate for vegetation loss. The ratio of compensation, species composition, and schedule of planting should follow the mitigation measures specified in Section 8 of the EIA Report.

To ensure the survival and establishment of the compensatory planting, a 10 year ecological monitoring extending to the aftercare phase, i.e. early 2030s – early 2040s, is proposed. Apart from the standard practices and regular maintenance covered by the landscape contract, monitoring of survival, height, health condition of species planted will be monitored.

Good site practices should be implemented to avoid encroachment onto the nearby natural habitats and disturbance to wildlife. Examples are detailed in various sections of the EIA report and include:

· Placement of equipment or stockpile in designated works areas and access routes selected on existing disturbed land to minimise disturbance to natural habitats.

· Restriction of construction activities to the work areas that would be clearly demarcated.

· Reinstatement of the work areas immediately after completion of the works.

· Only well-maintained plant should be operated on-site and plant should be serviced regularly during the construction programme;

· Machines and plant (such as trucks, cranes) that may be in intermittent use should be shut down between work periods or should be throttled down to a minimum;

· Plant known to emit noise strongly in one direction, where possible, be orientated so that the noise is directed away from nearby NSRs;

· Silencers or mufflers on construction equipment should be properly fitted and maintained during the construction works;

· Mobile plant should be sited as far away from NSRs as possible and practicable;

· Material stockpiles, site office and other structures should be effectively utilised, where practicable, to screen noise from on-site construction activities;

· Use of “quiet” plant and working methods

· Construction phase mitigation measures in the Practice Note for Professional Persons on Construction Site Drainage.

· Design and set up of the temporary on-site drainage system will be undertaken by the DBO Contractor prior to the commencement of construction.

· Design and incorporation of silt/sediment traps in the permanent drainage channels to enhance deposition rates and regular removal of reposited silt and grit.

· Minimization of surface excavation works during the rainy seasons (April to September), and in particular, control of silty surface runoff during storm events, especially for areas located near steep slopes.

· Regular inspection and maintenance of all drainage facilities and erosion and sediment control structures to ensure proper and efficient operation at all times and particularly following rainstorms.

· Provision of oil interceptors in the drainage system downstream of any oil/fuel pollution sources.

10.3 Monitoring and Audit for Ecology

The ecological monitoring and audit programme should be implemented as set out in this EM&A Manual. Four major components should be included and samples and measurements should be taken as summarised in Table 10.1:

· Survey and transplantation of the three plant species of conservation interest before site clearance and 2 years of monitoring after;

· Survey and, if found, translocation of the three fish species of conservation interest before site clearance, including Squaliobarbus curriculus, Osteochilus vittatus and Kuhlia marginata;

· Three-year ecological monitoring of nesting of Little Grebe in created freshwater ponds during its breeding season.

· 10-year ecological monitoring of compensatory woodland planting during the restoration and after-care phases;

Table 10.1 Ecological monitoring and audit requirements

Monitoring parameter	Frequency, Duration and Response
Transplantation of plant species of conservation concern before commencement of works
Survey of plant species of conservation concern within the Project Area	Survey of orchid and Pitcher Plant during dry season prior to Site Clearance to locate and mark the individuals to allow sufficient time for transplantation between March and May. Site preparation work for tree transplantation at least ½ year before transplantation. Select sites for transplantation.
Transplantation of tree and herbs	During early wet season for tree and orchid to enhance survival (March to May). Collection of node cuttings and cultivation for Pitcher Plant must be completed before end of May (beginning of flowering season) and transplantation must be completed within the wet season of the same year.
Monitoring of survival and growth of transplanted species	Monitoring should be conducted at least once a month during the first six months and twice a month in the following 18 months to ensure survival. The need of any further monitoring will be reviewed according to the monitoring results after the 2-year monitoring.
Translocation of fish species of conservation concern before commencement of works
Survey and translocation of fish species of conservation concern within the Project Area	Survey should be carried out within the wet season (Apr – Oct) prior to Site Clearance and should species of conservation concern be identified, the fish would be captured and released to receptor site on the same day. Survey should cease if no target species were found three consecutive days.
Ecological monitoring of created freshwater ponds after restoration phase (at both existing WENT Landfill site and the WENT Landfill Extension site)
Monitoring of nesting of Little Grebe in created freshwater ponds	A total of 3 years. Monthly during the major breeding season (March – August). The presence of nesting population will be monitored and recorded. The need of any further monitoring will be reviewed according to the monitoring results after the 3-year monitoring.
Ecological monitoring of woodland compensatory planting after restoration phase (at both existing WENT Landfill site and the WENT Landfill Extension site)
Monitoring of survival, growth and health conditions of planted trees	A total of 10 years. Quarterly during the first two years and every six months during the following three years of Phase 1 on exotic trees. Quarterly during the first two years and every six months during the following three years of Phase 2 on native trees. The need of any further monitoring will be reviewed according to the monitoring results after the 10-year monitoring.

Survey and Transplantation of Plant Species

Preparation work for transplantation of trees should be conducted in accordance to ETWB TC(W) No. 3/2006 – Tree Preservation, which specifies that when tree transplantation is required, the project office should allow at least 12 months in advance for consultation to obtain approval, sourcing of receptor location, and preparation works for transplanting operation.

This EIA identified at least four plant species of conservation interest within the Project area that would have been directly impacted by the WENT Landfill Extension. The STF EIA recorded 1 no. of Aquilaria sinensis, while the ecological surveys for the current WENT EIA recorded 2 no. of Arundina graminifolia, a few individuals and one major colony of Nepenthes mirabilis, and a few individuals of Ixonanthes reticulata. To minimise the ecological impacts, transplantation is recommended to three of these species, including the affected individuals of Aquilaria sinensis and Arundina graminifolia and the colony of Nepenthes mirabilis to suitable nearby habitats prior to the construction phase as far as practicable. Transplantation of Ixonanthes reticulata is not recommended due to the commonness of the plant and low survival after transplantation.

A detailed vegetation survey covered the affected habitats would be conducted prior to the commencement of site clearance works by a suitably qualified botanist /ecologist. The aim of the survey is to update, identify and record the location and number, health condition and suitability for transplantation of the affected individuals in order to provide details for the transplantation scheme. Locations of the species of conservation interest should be referred to but not be limited to those as shown in Figure 10.2 of the EIA Report. Each identified individual should be tagged. The requirements of detailed vegetation survey will be specified in the WENT Landfill Extension Contract.

Feasibility and suitability of transplanting the affected plant species of conservation interest would be carefully studied and suitable receptor sites would be identified by the transplantation scheme. Examples of the potential receptor sites for Aquilaria sinensis will be the peripheral area of new leachate treatment facilities at the WENT Landfill Extension site, while potential receptor site for Arundina graminifolia and Nepenthes mirabilis will be grassland habitat along the ravine of Stream B to the south of the Project Area (Figure 10.7 of the EIA Report). Proximity of the receptor sites to the Project Area will allow access for transplantation and monitoring while avoiding potential disturbance inside the Project Site due to earth work.

Local successful experience of Pitcher Plant transplantation (Weatherhead, undated), including site selection and propagation and transplantation methods were reviewed and should be followed. The recipient site should be of similar range and nature (NWNT, granitic rock, near permanent stream, similar associated plant species in shrubland and grassland). A potential location for transplantation is at Stream B (see Figure 10.7 of the EIA Report). Transplantation should be implemented between March and July. Nodal cutting must be conducted from March to May before flowering where vegetative growth is most prominent. The cuttings should have a minimum of three nodes with leaves and pitchers trimmed and nodes immediately inserted into damp peat moss in polythene bags. The potted cuttings should be put in a temporary on-site nursery with shelter net for screening and keep in moist environment for two to three weeks until at least two leaves are produced and auxiliary roots establish (If needed, cutting surfaces should be applied with fungicide to prevent decay, and rooting hormone should be applied as needed to stimulate root growth (Pietropaolo and Pietropaolo 1986). Then the potted cuttings can be transplanted to the recipient site. Transplantation must be completed before July in the same wet season to ensure survival of the plant. A detailed transplantation protocol and monitoring programme should be prepared by a suitably qualified ecologist or botanist appointed by the DBO contractor and submitted to AFCD for review and comments and EPD for approval prior to commencement of work. A detailed vegetation survey covered the affected habitats would be conducted by the qualified botanist / ecologist to identify and record the affected individuals in order to provide details for the transplantation scheme prior to the commencement of site clearance works. The requirements of detailed vegetation survey will be specified in the WENT Landfill Extension Contract.

To ensure good preparation of the transplantation work, the transplantation scheme should be formulated during the detailed design stage for this Project based on the information collected during the detailed vegetation survey. It should include careful selection of receptor sites, detailed transplantation methodology, and should be implemented and supervised by a suitably qualified botanist/ horticulturist. A monitoring programme should be set out to monitor the survival and evaluate the successfulness of transplantation. Upon completion of transplantation, monitoring should be implemented for 2 years. The health and condition of individuals of the transplanted plant species of conservation interest should be monitored during the first 2 years after transplantation. Monitoring should be conducted monthly during first 6 months, and bi-monthly in the next 18 month to ensure survival. Since die-back of current year’s growth is not uncommon, new stems, leaves and/or flowers produced from the cuttings in the following years, if observed in the following season, should be marked separately but also counted as survived individuals.

During construction, operation, restoration and aftercare phases, routine site inspection should be conducted on a weekly basis to audit the mitigation measures on disturbance on habitats adjacent to the work areas. Monitoring of transplantation should be audited as part of the site audit programme.

Survey and Translocation of Fish Species

The fish species Squaliobarbus curriculus, Osteochilus vittatus and Kuhlia marginata were not recorded in latest surveys from other studies and/or the present survey within the Project Area. These three species are not protected or threatened species, and it is expected that they should have a wider local distribution than the records showed. Similar habitats are also available in nearby streams. Nevertheless, a capture and translocation survey for fish is recommended given their limited records in Hong Kong. Survey should be conducted at Tsang Kok Stream and Stream A prior to the commencement of construction works in the two streams. Fish species of conservation concern found during the survey should be collected and translocated to suitable locations as agreed by AFCD. A detailed fish capture and translocation plan should be prepared by a qualified ecologist and submitted by the DBO contractor to AFCD for approval prior to commencement of work.

Creation and Ecological Monitoring of Compensatory Freshwater Pond

To mitigate the loss of 5 ha of water body including 3 ha of breeding habitats for Little Grebe, a total of 5 ha of freshwater ponds, with 3 ha will be created after the restoration phase of the existing WENT Landfill (Figure 8.12 of the EIA Report), and 2 ha provided after the restoration phase of the WENT Landfill Extension. Phasing of site formation on the WENT Landfill Extension site will be controlled to ensure the provision of the 3 ha of ponds on the existing landfill before the demolition of the middle ash lagoon.

These 5 ha of ponds would be designed according to the habitat requirements of this species recorded in the literature and supplemented by field observation. It is also anticipated that these ponds would also serve as an aquatic habitat to attract various waterbirds and aquatic fauna, and therefore enhance the ecological value of the site.

The number of nesting pairs in the east, middle and west lagoons between March 2007 and August 2008 were one, three and one respectively. Overall five pairs of Little Grebes might have nested in the three lagoons between March 2007 and August 2008. Therefore, the created ponds should provide breeding habitats for at least five pairs of Little Grebe.

Due to the moderate gradient of the terrain of existing landfill, it is technical more feasible to construct several small ponds than one large ponds. The size of each freshwater pond would be at least 0.5 ha, and each will accommodate at least one nesting pair of Little Grebe. This is supported by previous examples where Little Grebe bred in ponds with size ranged from 0.24ha to 0.89ha and eight pairs of Little Grebes nested in an enhanced fishpond of 1 ha in size (Table 10.4 of the EIA Report). Although the nesting distance recorded in the middle lagoon during the current study was larger (135m-173m), the condition of middle lagoon was not optimal due to ash deposits and large portion of dry surfaces even during breeding season. Nesting distance can be significantly reduced to 13m by higher vegetation cover (Masterson et al. 1994 in MWH 2003). Therefore, provision of 5 ha of ponds, each with at least 0.5 ha in size would be sufficient for compensation for Little Grebe habitats in terms of both area and function.

A schematic layout of the freshwater pond is provided in Figure 10.8 of the EIA Report. The pond slope will be profiled to gentle gradient of 1:4 to 1:6 to encourage the development of emergent plants. The gentle slope gradient also facilitates the use of the freshwater wetlands by wading birds (e.g., ardeids). Emergent plants could provide habitats for amphibian and dragonflies. Foraging perches for kingfishers could be provided by erected bamboo sticks on the pond shore. The ponds would be rain-fed with water depth of about 0.8 to 1.5m. The pond should be lined with hydric soil to ensure impermeability while allowing vegetation to develop. Drainage pipes or pumping systems should also be installed to adjust water level as needed. To maintain the water level of the ponds, a freshwater supply system and small water tank will be provided to refill the pond water due to evaporation. Automatic water level detection sensors will be installed at the ponds and tapped water will be pumped from the water tank to the ponds when the sensors hit the lower threshold point. In order to make tap water safe for pond life, pond water additives such as chlorine reduction agent and heavy metal neutralizer should be added. Native emergent aquatic vegetation (e.g. Phragmites, Carex, and Scirpus spp.) would also be planted on the pond slopes with water depths less than 0.5m. Tall grasses will be planted on the bund of the compensation wetland to provide some screening effect. These grasses could also provide nesting habitats for some passerines (e.g., prinias, munias). Emergent plants provide nesting substratum for Little Grebe. However, high coverage or overgrowth by emergent plants may reduce the value of the pond as nesting habitat of Little Grebe. Spread of vegetation could be controlled through either the placing of deep ditches (1.5m deep) around vegetation stands or the placing of vertical barriers, e.g. concrete sheets, in the substrate, both of which should restrict rhizome creep.

Small rafts can be anchored within the pond to provide nesting sites for Little Grebe. This could significantly improve breeding success since in Hong Kong heavy seasonal rain not infrequently results in nests being flooded.

MWH (2003) suggested the nesting density of Little Grebe might be related to the abundance of aquatic insects. Wetland without fish, which prey on aquatic insects, may be optimal breeding habitat of Little Grebe. Aquatic invertebrate populations in the compensation wetland will be enhanced through the exclusion of fish. No fish will be stocked in the ponds, and management practice should include regular removal of fish in these ponds.

Although the freshwater ponds are designed to mitigate the loss of breeding habitats of Little Grebe, these ponds also provide suitable habitats and microhabitats for other wetland fauna (e.g., waterbirds, raptors, dragonflies and aquatic fauna (e.g. Atyid shrimps). Therefore provision of freshwater ponds would enhance the overall ecological values of both the existing WENT Landfill and the WENT Landfill Extension site.

A habitat creation and management plan (HCMP) should be prepared by a qualified ecologist during the design and construction phase for the pond creation mitigation measures and would be circulated to relevant departments including AFCD for review and comment and EPD for approval before implementation.

Use of created ponds by Little Grebe should also be monitored monthly during its major breeding seasons (March - August) for 3 years. Activities of breeding including nests should be recorded, and the effectiveness of the mitigation measures evaluated. Other parameters including water level and vegetation cover will also be monitored.

The Trigger and Action Levels and Event Action Plan for monitoring of the created freshwater ponds are defined in Table 10.2.

Table 10.2 Trigger and Action Levels for monitoring of the created freshwater ponds

Parameter	Trigger and Action level	Event Action Plan
Water level	Trigger level: Beyond the range of 0.8m -1.5m	If the Trigger Level is exceeded, the ET Leader should inform DBO Contractor and IEC immediately. Automatic water level detection sensors should be checked, and frequency of monitoring should increase to closely monitor the water level and results reported to the DBO Contractor.
Water level	Action Level: Beyond the range of 0.8m -1.5m in 2 consecutive months	If the Trigger Level is exceeded, the ET Leader should inform all parties (DBO Contractor, EPD, AFCD and IEC) immediately. The DBO Contractor should propose alternative plan and work out the solution (e.g. replacing malfunction sensors, fixing leakage, pumping water into or draining the pond) according to the requirements of EPD and AFCD. Once the solution has been identified and agreed with all parties, the DBO Contractor should implement the solution.
Vegetation cover	Trigger level: Beyond the range of 10-30% on pond surface	If the Trigger Level is exceeded, the ET Leader should inform DBO Contractor and IEC immediately. Frequency of monitoring should increase to closely monitor the vegetation cover and results reported to the DBO Contractor.
Vegetation cover	Action Level: Beyond the range of 10-30% on pond surface in 2 consecutive months	If the Trigger Level is exceeded, the ET Leader should inform all parties (DBO Contractor, EPD, AFCD and IEC) immediately. The DBO Contractor should propose alternative plan and work out the solution according to the requirements of EPD and AFCD. Once the solution has been identified and agreed with all parties the DBO Contractor should implement the solution.

Ecological Monitoring of Compensatory Woodland

A qualified botanist/ecologist who forms a member of ET should review the detailed design of the compensatory planting in order to provide details for ecological monitoring scheme. He/she should oversee the planting work and conduct subsequent monitoring. The survival and health conditions of individuals of the selected plant species should be monitored over the 10-year period. Since planting will be conducted in phases in 5 years where native species will be planted in Years 3 to 5, ecological monitoring should be conducted by phases to ensure the survival of native species.

The Trigger and Action Levels and Event Action Plan for monitoring of compensatory woodland planting are defined in Table 10.3.

The implementation of mitigation measures and ecological works, DBO Contractor’s compliance with environmental requirements, and effectiveness of site mitigation measures during construction, operation, restoration and aftercare phases should be monitored and audited as detailed in the EM&A programme. The details of the ecological monitoring plans should be developed by the ecologist of the ET and agreed by EPD and AFCD prior to commencement of construction works.

Table 10.3 Trigger and Action Levels and Event Action Plan for monitoring of compensatory woodland planting

Parameter	Trigger and Action level	Event Action Plan
Mortality*	Trigger Level: > 20% of mortality of any sampled planted species or overall survival.	If the Trigger Level is exceeded the ET Leader should inform DBO Contractor and IEC) immediately. Frequency of monitoring should increase to closely monitor the survival and results reported to the DBO Contractor.
Action Level: > 30% of mortality of any of each transplanted species.	If the Trigger Level is exceeded the ET Leader should inform all parties (DBO Contractor, EPD, AFCD and IEC) immediately. The DBO Contractor should propose alternative plan and work out the solution (e.g. replacement planting) according to the requirements of EPD and AFCD. Once the solution has been identified and agreed with all parties the DBO Contractor should implement the solution.

Parameter

Trigger and Action level

Event Action Plan

Mortality*

Trigger Level:

> 20% of mortality of any sampled planted species or overall survival.

If the Trigger Level is exceeded the ET Leader should inform DBO Contractor and IEC) immediately. Frequency of monitoring should increase to closely monitor the survival and results reported to the DBO Contractor.

Action Level:

> 30% of mortality of any of each transplanted species.

If the Trigger Level is exceeded the ET Leader should inform all parties (DBO Contractor, EPD, AFCD and IEC) immediately. The DBO Contractor should propose alternative plan and work out the solution (e.g. replacement planting) according to the requirements of EPD and AFCD. Once the solution has been identified and agreed with all parties the DBO Contractor should implement the solution.

* Total defoliation with no evidence of regeneration (such as presence of leaf buds, stem buds).

11 Pulverized Fuel Ash Monitoring

11.1 Introduction

According to the health risk assessment, there is no significant radiological hazard to the workers at the proposed part of the WENT Landfill Extension on an ash lagoon during construction, operation, restoration and aftercare phases. However, recommended measures/ good practices shall be considered during the design, construction, operation, restoration and aftercare of the WENT Landfill Extension.

11.2 Mitigation Measures

For buildings within the WENT Landfill Extension, prevention of radon of at least 1m from the PFA to the buildings is preferred as good practices. A soil cover can be provided beneath the buildings on top of ash lagoon prior to construction works because it reduces the level of radon influx significantly. Slab-on-grade can be an option on foundation design. In addition, soil suction can also prevent radon from entering the buildings by drawing the radon from below the buildings and venting it through a pipe, or pipes, to the air above the buildings.

Sufficient ventilation should be provided at the interior of the buildings within the WENT Landfill Extension. Forced and natural ventilation should be introduced properly to enhance air exchange rate in the buildings. If basement is provided, pressurization by using a fan to blow air into the basement areas from outdoors is suggested. This would create enough pressure at the lowest level indoors to prevent radon from entering into the buildings.

Regular maintenance should be provided for the floor slabs and walls. Cracks and other openings in the foundation should be properly sealed to reduce radon ingress. Sealing the cracks limits the flow of radon into the buildings thereby making other radon reduction techniques more effective and cost-efficient. It also reduces the loss of conditioned air.

Prior the occupation of the buildings, radon concentrations shall be measured by professional persons in accordance with EPD ProPECC Note PN 1/99 Control of Radon Concentration in New Buildings Appendix 2, “Protocol of Radon Measurement for Non-residential Building” to ensure the radon concentration is in compliance with the guidance value. The EMIS is included in Appendix C9.

12 Environmental Audit

12.1 Site Inspection

Site inspection provides a direct means to initiate and enforce the specified environmental protection and pollution control measures. These should be undertaken routinely to inspect construction activities to ensure these measures are implemented properly. Site inspection is one of the most effective tools to enforce the environmental requirements on-site.

The ET Leader should be responsible to formulate the environmental site inspection requirements, deficiency and action reporting system, and to conduct the site inspection works. Within 21 days of the commencement of construction works, the ET Leader should submit a proposal for site inspection and deficiency and action reporting procedures to the DBO Contractor for agreement and the IEC and IC for approval. The ET’s proposal for rectification should be made known to the IEC.

Regular site inspections should be carried out at least once per week. The areas of inspection should not be limited to the environmental situation, pollution control and mitigation measures within the site. The inspection should also include a review of the environmental situations outside the works area which would likely to be affected, directly or indirectly, by the works activities. The ET Leader should make reference to the following information when conducting site inspection:

· Recommendations in EIA Report on the environmental protection and pollution control mitigation measures;

· Works progress and programme;

· Individual works methodology and proposals, including proposal on the associated pollution control measures;

· DBO Contract specifications on environmental protection requirements;

· Relevant environmental protection and pollution control legislation; and

· Previous site inspection results.

The DBO Contractor should keep the ET Leader updated with all relevant information on the construction contract necessary to carry out the site inspections. All inspection findings and associated recommendations for improvements to the environmental protection and pollution control works should be submitted to the IEC and DBO Contractor within 24 hours after inspection. The DBO Contractor should follow the procedures and time-frame as recommended in the site inspection and the deficiency and action reporting system formulated by the ET Leader to report on any remedial measures implemented subsequently. Ad-hoc site inspections should be carried out if significant environmental problems were identified. Inspections may also be required subsequent to receipt of environmental complaints or as part of the investigation work as specified in the EAP for the EM&A programme.

12.2 Compliance with Environmental Requirements

There are contractual environmental protection and pollution control requirements as well as environmental protection and pollution control legislation in Hong Kong with which construction activities should comply. All works method statements submitted by the DBO Contractor to the IC for approval should be sent to the ET Leader for review and vetting to ensure sufficient environmental protection and pollution control measures have been included. The EMIS is included in Appendix C.

The ET Leader should review the progress and programme of the project works to check that relevant environmental legislation has not been violated and that any foreseeable potential for violating the laws should be avoided. The DBO Contractor should regularly copy the relevant documents to the ET Leader so that proper audit and checking should be conducted. Such documents should at least include the updated works progress reports, works programme, correspondences for application of different environmental licenses/permits under the environmental protection legislation, and copies of all valid environmental licenses/permits. Site diary should be available for ET Leader's inspection upon request.

The ET Leader should advise the IEC and DBO Contractor of any non-compliance and non-conformance with the contractual and legislative requirements on environmental protection and pollution control for follow-up action. If the ET Leader's review concluded that the current status on environmental license/permit application and environmental protection and pollution control preparation works may result in potential violation of the specified requirements, the ET Leader should advise immediately inform the DBO Contractor and IC accordingly. Upon receipt of such advice, the DBO Contractor should take immediate action to rectify the situation. The IC should follow up with the cases to ensure that appropriate action has been taken to satisfy contractual and legal requirements.

12.3 Environmental Complaints

All environmental complaints should be referred to the ET Leader for further action. The ET Leader should undertake the following procedures upon receipt of any complaints:

· Log the complaint and date of receipt into the complaint database and inform the IEC immediately;

· Investigate the complaint to determine its validity and assess whether the source of problem would be due to the project works activities;

· Identify the mitigation measures in consultation with the IEC if the complaint was valid and due to the project works;

· Advise the DBO Contractor if further mitigation measures were required;

· Review the DBO Contractor's response to the identified complaint, mitigation measures and updated situation;

· If the complaint was transferred from the EPD, submit the interim report to the EPD on the status of the complaint investigation and follow-up action within the time frame as assigned by the EPD;

· Conduct additional monitoring and audit to verify the situation if necessary and review the circumstances leading to the complaint to avoid no recurrence;

· Report the investigation findings and subsequent action to the complainant. If the source of complaint was originated from the EPD, the findings should be reported within the timeframe as assigned by the EPD; and

· Record the environmental complaint, investigation, subsequent action taken and investigation findings in the monthly EM&A reports.

13 Reporting

13.1 General

Reports should be provided in an electronic medium upon agreement of the format for submission to the EPD. All the monitoring data (baseline and impact) should also be submitted on diskettes or other agreed media. The formats of monitoring data to be submitted should be separately agreed. The types of reports that the ET Leader should prepare and submit include Baseline Monitoring Report, Monthly EM&A Reports, Quarterly EM&A Summary Report, Annual EM&A Review Report, and Final EM&A Review Report during the completion and cessation of each project phases.

13.2 Baseline Monitoring Report

The ET Leader should prepare and submit a Baseline Environmental Monitoring Report within 10 working days of completion of the baseline monitoring. Copies of the Baseline Environmental Monitoring Report should be submitted to the DBO Contractor, IEC, IC, Project Proponent and EPD. The ET Leader should liaise with the relevant parties on the exact number of copies they require. The report format and baseline monitoring data format should be agreed with the EPD prior to submission. The Baseline Monitoring Report should include at least the following:

· Up to half a page executive summary;

· Brief project background;

· Drawings showing baseline monitoring locations;

· Monitoring results (both hard and soft copies) together with: monitoring methodology, name of laboratory and types of equipment used and calibration details, parameters monitored, monitoring locations, date, time, frequency and duration, and quality assurance (QA) / quality control (QC) results and detection limits;

· Details of influencing factors including major activities being carried out on-site, weather conditions and other factors during the monitoring period which might affect results;

· Determination of the Action and Limit Levels for each monitoring parameter and statistical analysis of the baseline data, the analysis should conclude if there is any significant difference between control and impact stations for the parameters monitored;

· Revisions for inclusion in the EM&A Manual; and

· Comments, recommendations and conclusions.

13.3 Impact EM&A Reports

The results and findings of all phases of EM&A programme should be recorded in the Monthly, Quarterly, Annual and Final EM&A Reports prepared by the ET. The EM&A reports should be submitted within 10 working days of the end of each reporting month, with the first Monthly EM&A Report due the month after commencement of construction works. Each EM&A report should be submitted to the DBO Contractor, IEC, IC, Project Proponent and EPD. Prior to submission of the first Monthly EM&A Report, the ET Leader should liaise with all parties for the required number of copies and format of the report in both hard copy and electronic medium. The ET leader should also review the number, parameter and location for impact monitoring on six-monthly basis, or as needed, so as to cater any changes in the baseline condition and surrounding environment.

First Monthly EM&A Report

The first Monthly EM&A Report should include at least the following:

· Executive summary (1-2 pages): Exceedance of A/L Levels, complaint log, notifications of summons and successful prosecutions, reporting changes, and future key issues;

· Brief project information: Project organisation e.g. key personnel, their contact names and telephone numbers, project programme, management structure, and works undertaken during the month;

· Environmental performance status: Works undertaken during the month with illustrations (e.g. location of works, daily excavation rate, etc) and drawings showing the project area, environmental sensitive receivers and impact monitoring and control/ reference locations (with co-ordinates);

· Brief summary of EM&A requirements: All monitoring parameters, environmental quality performance limits (A/L Levels), EAP, environmental mitigation measures as recommended in the EIA Report, and contractual environmental requirements;

· Implementation status of mitigation measures: Advice on the implementation status of environmental protection and pollution control/mitigation measures as recommended in EIA Report;

· Monitoring results (in both hard and soft copies) with the following information: Monitoring methodology, name of laboratory and types of equipment/instrument deployed and calibration details, parameters monitored, monitoring locations, date, time, frequency and duration, weather conditions, other factors affecting the monitoring results, and QA/QC results and detection limits;

· Non-compliance, complaints and notifications of summons and successful prosecutions: Record of all non-compliance or exceedance of the environmental quality performance limits (A/L Levels), complaints received (written or verbal) for each media e.g. locations and nature of complaints investigation, liaison and consultation undertaken, actions and follow-up procedures taken, results and summary, notification of summons and successful prosecutions for breaches of current environmental protection/pollution control legislation, including locations and nature of the breaches, investigation, follow-up actions taken, results and summary, reasons for and the implications of non-compliance, complaints, summons and prosecutions including review of pollution sources and working procedures, and description of the actions taken in the event of non-compliance and deficiency reporting and any follow-up procedures related to earlier non-compliance; and

· Other information: Account of future key issues as reviewed from the works programme and method statements, advice on waste management status, and comments on effectiveness and efficiency of mitigation measures, recommendations on any improvement in the EM&A programme, and conclusion.

Subsequent Monthly EM&A Reports

Subsequent monthly EM&A reports should include the following:

· Executive summary (1-2 pages): Breaches of A/L Levels, complaints log, notifications of summons and successful prosecutions, reporting changes, and future key issues;

· Brief project information: Project organisation e.g. key personnel, their contact names and telephone numbers, project programme, management structure, and works undertaken during the month;

· Implementation status of mitigation measures: Advice on the implementation status of environmental protection and pollution control/mitigation measures as recommended in EIA Report;

· Non-compliance, complaints and notifications of summons and successful prosecutions: Record of all non-compliance or exceedance of the environmental quality performance limits (A/L Levels), complaints received (written or verbal) for each media e.g. locations and nature of complaints investigation, liaison and consultation undertaken, actions and follow-up procedures taken, results and summary, notification of summons and successful prosecutions for breaches of current environmental protection/pollution control legislation, including locations and nature of the breaches, investigation, follow-up actions taken, results and summary, reasons for and the implications of non-compliance, complaints, summons and prosecutions including review of pollution sources and working procedures, and description of the actions taken in the event of non-compliance and deficiency reporting and follow-up procedures related to earlier non-compliance;

· Appendix: A/L levels, graphical plots of trends of monitored parameters at key stations over the past 4 reporting periods for representative monitoring stations annotated against the major activities being carried out on site during the period, weather conditions during the period, and any other factors that might affect the monitoring results, monitoring schedule for the present and next reporting period, cumulative statistics on complaints, notifications of summons and successful prosecutions, and outstanding issues and deficiencies.

Quarterly EM&A Summary Reports

Quarterly EM&A Summary Report of around 5 pages should include the following information:

· Executive summary (1-2 pages);

· Brief project information including a synopsis of the project organisation, works programme, contacts of key personnel of the EM&A programme, and synopsis of works undertaken during the reporting quarter;

· Brief summary of EM&A requirements e.g. monitoring parameters, environmental quality performance limits (A/L Levels), and environmental mitigation measures as recommended in the EIA Report;

· Advice on implementation status of environmental protection and pollution control/mitigation measures as recommended in the EIA Report and summarised in the updated EMIS;

· Drawings showing the project area, environmental sensitive receivers and the monitoring and control locations;

· Graphical plots of trends in monitored parameters over the past four months (the last month of the previous quarter and the reporting quarter) for representative monitoring locations annotated against: major activities being carried out on-site, weather conditions, and other factors which might affect the monitoring results during the reporting quarter;

· Advice on the waste management status;

· Summary of non-compliance or exceedance of the environmental quality performance limits (A/L Levels);

· Brief review of the reasons for and implications of the non-compliance, e.g. review of pollution sources and working procedures;

· Summary description of action taken in the event of non-compliance and follow-up procedures related to any earlier non-compliances;

· Summarised records of all complaints received (written or verbal) for each media, liaison and consultation undertaken, follow-up action and procedures taken;

· Comments (e.g. a review of the effectiveness and efficiency of environmental mitigation measures and performance of the environmental management system of the overall EM&A programme), recommendations (e.g. improvement in the EM&A programme) and conclusion for the reporting quarter; and

· Project Proponent’s contacts and any hotline telephone number for the public to make enquiries.

Annual EM&A Review Reports

The Annual EM&A Report should include at least the following information:

· Executive summary (1-2 pages);

· Drawings showing the project area, environmental sensitive receivers and monitoring and control locations;

· Brief project information including a synopsis of the project organisation, contacts of key personnel of the EM&A programme, and synopsis of work undertaken during the past 12 months;

· Brief summary of EM&A requirements e.g. environmental mitigation measures as recommended in the EIA Report, environmental impact hypotheses tested, environmental quality performance limits (A/L Levels), all monitoring parameters, and EAP;

· Summary of the implementation status of environmental protection and pollution control/mitigation measures as recommended in the project EIA Report and summarised in the updated EMIS;

· Graphical plots and statistical analysis of the trends of monitored parameters annotated against major activities carried out on-site, weather conditions and other factors which might affect the monitoring results during the reporting year;

· Summary of non-compliance or exceedance of the environmental quality performance limits (A/L Levels);

· Review of the reasons for and implications of non-compliances including the pollution sources and working procedures as appropriate;

· Description of actions taken in the event of non-compliances;

· Summary record of all complaints received (written or verbal) for each media, liaison and consultation undertaken, follow-up action and procedures taken;

· Summary record of notifications of summons and successful prosecutions for breaches of the current environmental protection / pollution control legislation, locations and nature of the breaches, investigation follow-up actions taken and results;

· Review of the validity of EIA predictions and identification of shortcomings in EIA recommendations, and

· Comments (e.g. a review of the effectiveness and efficiency of environmental mitigation measures and performance of the environmental management system of the overall EM&A programme); and

· Recommendations and conclusions (e.g. review of success of the overall EM&A programme to cost-effectively identify deterioration and to initiate prompt effective rectification action when necessary) of the reporting year.

Final EM&A Review Report

The Final EM&A Review Reports should be submitted prior to the completion and cessation of each project phases including the Construction and Operation, Restoration, and Aftercare Phases. The report should include at least the following information:

· Executive summary (1-2 pages);

· Drawings showing the project area, environmental sensitive receivers and monitoring and control locations;

· Brief project information including a synopsis of the project organisation, contacts of key personnel of the EM&A programme, and synopsis of work undertaken during the entire reporting project phase;

· Summary of the implementation status of environmental protection and pollution control/mitigation measures as recommended in the project EIA Report and summarised in the updated EMIS;

· Summary of non-compliance or exceedance of the environmental quality performance limits (A/L Levels);

· Review of the reasons for and implications of non-compliances including the pollution sources and working procedures as appropriate;

· Description of actions taken in the event of non-compliances;

· Summary record of all complaints received (written or verbal) for each media, liaison and consultation undertaken, follow-up action and procedures taken;

· Review of the validity of EIA predictions and identification of shortcomings in EIA recommendations, and

· Comments (e.g. a review of the effectiveness and efficiency of environmental mitigation measures and performance of the environmental management system of the overall EM&A programme); and

13.4 Data Keeping

No site-based documents such as monitoring field records, laboratory analysis records, site inspection forms, etc should be required to include in the monthly EM&A reports. However, any such documents should be well kept by the ET Leader ready for inspection on request. All relevant information should be clearly and systematically recorded. All monitoring data should also be recorded in magnetic media form, with the soft copy readily available on request. The data format should be agreed with the EPD. All documents and data should be kept for at least 1 year following the project completion.

13.5 Interim Notification of Environmental Exceedance

With reference to the EAP, when the environmental quality performance limits (i.e. A/L Levels) are exceeded, the ET Leader should immediately notify the IEC, IC, Project Proponent and EPD, as appropriate. The notification should be followed up with advice to the IEC and EPD on the results of the investigation, proposed action and outcome of action taken, with necessary follow-up proposals.