1. INTRODUCTION

1.1 Purpose of the Manual

1.1.1 The purpose of this Environmental Monitoring and Audit (EM&A) Manual is to guide the set up of an EM&A programme to ensure compliance with the Environmental Impact Assessment (EIA) study recommendations, to assess the effectiveness of the recommended mitigation measures and to identify any further need for additional mitigation measures or remedial action. This Manual outlines the monitoring and audit programme for the construction of the Yau Tong Bay (YTB) reclamation. It aims to provide systematic procedures for monitoring, auditing and minimizing environmental impacts associated with construction works and operational activities.

1.1.2 Hong Kong environmental regulations for water quality, noise, waste, the Hong Kong Planning Standards and Guidelines, and recommendations in the EIA study final report on Reclamation of Yau Tong Bay have served as environmental standards and guidelines in the preparation of the Manual.

1.1.3 This Manual contains the following:

· responsibilities of the Contractor, the Engineer or Engineer’s Representative (ER), Environmental Team (ET), and the Independent Checker (Environment) (IC(E)) with respect to the environmental monitoring and audit requirements during the course of the project;

· information on project organization and programming of construction activities for the project;

· requirements with respect to the construction schedule and the necessary environmental monitoring and audit programme to track the varying environmental impact;

· full details of the methodologies to be adopted, including all field laboratory and analytical procedures, and details on quality assurance and quality control programme;

· the rationale on which the environmental monitoring data will be evaluated and interpreted and the details of the statistical procedures that will be used to interpret the data;

· 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 the environmental criteria and complaints;

· requirements of presentation of environmental monitoring and audit data and appropriate reporting procedures; and

· requirements for review of EIA predictions and the effectiveness of the mitigation measures/environmental management systems and the EM&A programme.

1.1.4 For the purpose of this manual, the ET leader who shall be responsible for and in charge of the ET, shall refer to the person delegated the role of executing the environmental monitoring and audit requirements.

1.2 Project Description

1.2.1 The site is located in the eastern side of Kowloon to the south of the Eastern Harbour Crossing and is in an area of existing development. The site location plan is given in Figure 1.1. The site is bounded on the north and to the east by Cha Kwo Ling Road and existing development, to the south by Ko Fai Road and existing development and to the west by Victoria Harbour. Figures 1.2a and 1.2b show the proposed layout plan of Yau Tong Bay reclamation – Full Reclamation Option and Minimised Reclamation Option respectively. The proposed reclamation site is significantly zoned as Comprehensive Development Area (CDA) on the current Cha Kwo Ling, Yau Tong, Lei Yue Mun Outline Zoning Plan No. S/K/15/13. A request for rezoning of Yau Tong Bay CDA was submitted by David C Lee Surveyors Ltd. on behalf of Main Wealth Development Ltd. on 1 August 1998 and approval in principle was given on 11 December 1998 by the MPC. The amended population of the development on the proposed CDA is about 39,000 persons.

1.2.2 The project area is about 28.5 hectares and 21.5 hectares for Full Reclamation option and Minimised Reclamation option respectively. About 9.6 hectares of the project area are Yau Tong Bay Marine Lots and 0.55 hectare is government lots. The area of reclamation in Full Reclamation option and Minimised Reclamation option are 18 hectares and 12 hectares respectively. In the 18 hectares of reclamation area of the Full Reclamation option, about 3.8 hectares are the additional reclamation area for open space at waterfront and construction of the viaducts foundation of WCR.

1.2.3 The proposed Full Reclamation option of Yau Tong Bay reclamation is larger than the Minimised Reclamation option in terms of area of reclaimed land and volume of dredging and filling. The environmental impacts, especially water quality impact, generated by the Full Reclamation option within the same construction period and duration, are undoubtedly more significant than the Minimised Reclamation option or the Gazetted Reclamation. For the purpose of EIA study, the Full Reclamation is, therefore, taken as the worst scenario for the environmental impact assessment. If the environmental impacts due to the Full Reclamation option are not insurmountable, then the impacts of Minimised Reclamation option can be assumed environmentally surmountable.

1.2.4 The reclamation of Yau Tong Bay consists of two main grounds of works - Marine Works and Lands Works.

1.3 Marine Works

1.3.1 The Yau Tong Bay reclamation – Full Reclamation option will involve the construction of total length 340m (290m for Minimised Reclamation option) of new seawall at the western side of the Site facing to Victoria Harbour. The new seawall will be situated on dredged foundation which will be formed by removing the soft marine deposit at the seabed. Rockfill will be placed onto the dredged seawall trench to form the foundation of seawall. Above the foundation, the new seawall will be built by precast concrete blocks or rockfill.

1.3.2 The recommended reclamation scheme and phasing have been based on engineering, amount of available land, programme and cost considerations.

General Reclamation Areas

1.3.3 It is recommended to use a “drained” reclamation with preloading for general reclamation areas. Drained reclamation relies on the installation of additional drainage paths into the soft compressible deposits. These additional drainage paths shorten the overall drainage path of the marine compressible material resulting in quicker consolidation. Preloading comprises subjecting the ground to a temporary load which is greater than the envisaged final loading. The aim of preloading is to speed up the rate of settlement and slightly over consolidate the ground, thus minimize the amount of residual settlement and enable the site to be handed over for other construction activities as early as possible. The details of the recommended scheme are presented below:-

· Place Geotextile across the area to be reclaimed to prevent the formation of mud waves.

· Place sand blankets of 0.5m, 0.5m and 1.0m thick across the site. Placement of sandfill by Grabbing or Pelican Barge.

· Installation of vertical band drains as a marine operation.

· Bulk filling to +2.5mPD, or an appropriate level which breaks the mean high water mark. Bottom dumping of fill material should be employed while there is sufficient depth of water. After that, placement of filling material can be carried out by Pelican Barge.

· Bulk filling to preload level. Placement of fill by Pelican Barge with dump trucks and loader.

· Surcharge period.

· Remove preloading mount to formation level once the anticipated settlement of the preloading mount has been achieved.

· Handing over the Site for utilities, infrastructure and foundation works.

1.3.4 There are three reasons to place geotextile over the seabed to be reclaimed. Firstly, to minimize seabed disturbance during filling processes and therefore reduce the amount of suspended solids in the water column. Secondly, to reduce the amount of intermixing between the seabed deposits and the placed fill material. Thirdly, to minimize the risk of mud waves occurring. The placement of a thin layer of sand blankets also helps to reduce the risk of mud waves occurring.

Reclamation above the Pipe Reserve

1.3.5 No matter which reclamation options will be adopted, it is recommended that a removable concrete decking supported on bored piles should be constructed above the submarine WSD 1400mm diameter fresh water main and twin 600mm diameter gas pipelines. The decking is removable in order to enable emergency repair or maintenance of the submarine gas pipelines and watermain. An access opening of minimum 35m x 10m will be provided in the piled deck to allow for routine maintenance of WSD Cha Kwo Ling Saltwater Pumping Station which is located adjacent to the decking. Rubbish, if trapped underneath the decking, can be easily removed through this opening on deck. Also, it can prevent the accumulation of gas trapped underneath the deck in case of leakage of gas in the submarine pipelines. The function of the decking is to provide an open space to form a continuous promenade should government considers that a waterfront promenade is desirable. Besides, the most important purpose of the decking is to create a smooth coastline with adjoining seawalls which can improve the abrupt coastline of the small embayment formed by the new vertical bored pile seawall and the existing seawall.

Reclamation under Roads and Utility Reserves

1.3.6 It is recommended that the same scheme outlined above shall be applied for the reclamation beneath proposed internal roads except the the fill material shall be compacted to achieve an over consolidation ratio of 1.2 under working conditions in the marine deposit. This will reduce the residual settlements.

Reclamation at Proposed Box Culverts

1.3.7 It is recommended that the marine deposit at the foundation of the two main box culverts should be dredged to minimize the settlement of the culverts. The preloading of culvert foundation will be started after bulk filling to the required level. Details of culvert construction will be determined and agreed with DSD in detailed design stage.

Permanent Seawalls (Except the Seawall adjacent to the Submarine Pipelines)

1.3.8 Except the seawall adjacent to the submarine pipelines, all permanent seawalls are recommended to be founded on dredged foundations. The dredged foundations can be replaced by DCM, Jet Grouting, Stone Columns or Sand Columns if these method have been shown to be applicable in a trial.

1.3.9 Seawalls facing to Victoria Harbour will be designed as wave absorbing seawall with a wave-reflecting coefficient of less 0.5 in accordance with WBTC 3/95. In order to achieve this, the use of sloping seawalls or vertical caisson seawall is recommended. At locations where berthing of marine vessels is allowed, either a piled quay deck over the sloping seawall or a caisson seawall should be constructed.

Permanent Seawall Adjacent to the Submarine Pipelines

1.3.10 Bore piled seawall in accordance with WSD requirements is recommended for the permanent seawall adjacent to the existing submarine pipelines. This type of seawall will be costly and time consuming to construct, however it is the only solution which can satisfy the requirements of WSD currently. The bore piled seawall is one of the possible solutions but it is not the only solution. Alternatives to this costly type of seawall should be investigated during the preliminary or detailed design stages if necessary.

1.3.11 A temporary dredged seawall should be constructed in accordance with the WSD’s allowable dredging limit. This temporary seawall is used to enclose the main body of the reclamation while the bored pile seawall is being constructed.

Temporary Reclamation Edge Structures

1.3.12 As described in Section 1.5 below, it is proposed to phase the majority of the reclamation on a rolling programme. This should preclude the need for temporary reclamation edge structures. However, if there is a requirement for a temporary reclamation edge structure, one of the following should be used: vertical cantilever (braced bulkhead); vertical seawall; sloping seawall; or a 1:10 to 1:15 “beach” slope.

1.3.13 The leading edge of the reclamation should generally be formed using a 1:10 to 1:15 “bench” slope.

1.3.14 The southern edge of Phase 1a reclamation should be formed using a temporary sloping seawall which utilises the dredged foundation of the permanent culvert. This will ensure a clear marine access to the remaining reclamation construction.

1.3.15 The interface between the WCR reclamation and the Yau Tong Bay Reclamation should be formed using a sloping seawall.

Temporary Culvert / Channel

1.3.16 It is proposed to provide a temporary culvert/channel along the existing eastern and southern seawall of Yau Tong Bay to collect and convey the discharge form the outfalls of the existing stormwater box culverts into the harbour. This structure should utilise the existing seawall foundations wherever possible. The temporary culvert/channel should be constructed at the beginning of reclamation to prevent stormwater from the existing culvert from discharging into the embayment formed by permanent and temporary seawalls, otherwise, the polluted stormwater trapped in the embayment would affect the environment.

1.4 Lands Works

1.4.1 The area surrounding Yau Tong Bay currently consists of low-rise industrial building structures which include shipyards, concrete batching plant, timber yards and sawmills. In order to allow the re-development of Yau Tong Bay, these existing building structures will be decommissioned and demolished. The major land works involved in the reclamation of Yau Tong Bay is the demolition of existing building structures and land decontamination works.

1.5 Construction Programme and Phasing

1.5.1 The following is a list of the assumptions and imposed constraints considered when formulating the reclamation phasing :-

· Reprovision of the drainage culverts discharging into Yau Tong Bay.

· Provision of land for the Western Coast Road (WCR) – Coastal Option construction

· The WSD and Hong Kong and China Gas Co. submarine pipe reserve in the northwest corner of the Site.

· The reclamation works for this project will commence on February 2004.

· The temporary culvert needs to be constructed before the bay is fully enclosed.

· The bay should be fully enclosed, except for a 50m wide marine access, before the main filling works commence.

· An average filling rate of 4,000 m³ per day, with a maximum of 10,000 m³ per day.

· The reclamation works should be constructed utilizing a rolling programme wherever possible.

1.5.2 The assumed average filling rate is based on :-

	Filling Activity	Filling Method	Filling Rate
1.	Sand Blanket	Grabbing or Pelican Barge (Delicately)	1,000 m³/day
2.	Bulk Filling below ‑4mPD	Bottom dumping	10,000 m³/day
3.	Bulk Filling above ‑4mPD	Pelican Barge	1,000 m³/day to 7000 m³/day (Average 4,000³/day)

1.5.3 Placement of filling material for the sand blanket is of small amount. After placement of the sand blanket, level of the western portion of the bay will be probably below -4mPD, therefore, bottom dumping can be carried out in this area. The average filling rate of the Pelican barges has been used instead of a higher value to counter act the uncertainty in the supply of filling materials under the following possible situations during construction. They are :-

· Uncertainty in supply rate of filling material from the Pearl River Delta.

· Size and number of marine vessels available.

· Limitation on the number of marine vessels that allowed by Marine Department of the Government of HKSAR to work at Victoria Harbour.

· Congestion within Yau Tong Bay with other activities, i.e. marine installation of vertical band drains.

1.5.4 In order to satisfy the above constraints, three construction phases have been proposed (Figure 1.3). Phase 1 is the main body of the reclamation. Phase 2 is to reclaim the remaining area between the bore piled seawall and the temporary seawall. Phase 3 is the concrete decking construction above the submarine pipe.

1.5.5 Phase 1 will form the main body of the reclamation. The lines within the Phase 1 reclamation area represent the leading edge of the reclamation at each sub-phase. Phase 1a is specifically reclaimed to provide land for the WCR construction. Except for Phase 1a, the edge of each of the other sub-phases (1b, 1c, and 1d) should be formed by a 1:10 to 1:15 “beach” slope. A temporary sloping seawall should be constructed along the southern edge of Phase 1a reclamation by utilizing the dredged foundation of the proposed culvert extension.

1.5.6 Phase 2 of the reclamation is to reclaim the portion of land between the temporary seawall and the permanent bore piled seawall adjacent to the submarine pipelines.

1.5.7 Phase 3 of the reclamation is the removable concrete decking above the submarine pipe reserve.

1.5.8 The tentative works programme for the project is given in Appendix H. This programme is for the ET Leader to obtain an initial idea of the projection of the works. The ET Leader shall make reference to the actual works progress and programme during the construction stage to schedule the EM&A works, and the Contractor shall provide the respective information to the ET leader for formulating the EM&A.

1.6 Project Organization

1.6.1 The proposed project organization and lines of communication with respect to environmental protection works are shown in Figure 1.4.

1.6.2 The ET leader shall be an independent party from the contractor and have relevant professional qualifications, or have sufficient relevant EM&A experience subject to approval of the Engineer’s Representative (ER) and the Environmental Protection Department (EPD).

1.6.3 The responsibility of respective parties are:

The Contractor:

· Employ an Environmental Team (ET) to undertake monitoring, laboratory analysis and reporting of environmental monitoring and audit;

· Provide assistance to ET in carrying out monitoring;

· Submit proposals on mitigation measures in case of exceedances of Action and Limit levels in accordance with the Event and Action Plans;

· Implement measures to reduce impact where Action and Limit levels are exceeded; and

· Adhere to the procedures for carrying out complaint investigation in accordance with Section 8.3.

Engineer or Engineer’s Representative:

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

· Inform the Contractor when action is required to reduce impacts in accordance with the Event and Action Plans;

· Employ an Independent Checker (Environment)(IC(E)) to audit the results of the EM&A works carried out by the ET; and

· Adhere to the procedures for carrying out complaint investigation in accordance with Section 8.3.

Environmental Team:

· Monitor the various environmental parameters as required in the EM&A Manual;

· Analyse the environmental 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;

· Carry out site inspection to investigate and audit the Contractors' site practice, equipment and work methodologies with respect to pollution control and environmental mitigation, and effect proactive action to pre-empt problems;

· Audit and prepare audit reports on the environmental monitoring data and site environmental conditions;

· Report on the environmental monitoring and audit results to the IC(E), Contractor, the ER and EPD or its delegated representative;

· Recommend suitable mitigation measures to the Contractor in the case of exceedance of Action and Limit levels in accordance with the Event and Action Plans; and

· Adhere to the procedures for carrying out complaint investigation in accordance with Section 8.3.

Independent Checker (Environment):

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

· Audit the monitoring activities and results (at not less than monthly intervals);

· Report the audit results to the ER and EPD in parallel;

· Review the EM&A reports (monthly & quarterly summary reports) submitted by the ET;

· Review the proposal on mitigation measures submitted by the Contractor in accordance with the Event and Action Plans; and

· Adhere to the procedures for carrying out complaint investigation in accordance with Section 8.3.

1.6.4 Sufficient and suitably qualified professional and technical staff shall 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. NOISE

2.1 Noise Sensitive Receivers (NSRs)

2.1.1 Although the construction noise assessment indicates that the predicted mitigated noise levels at all NSRs comply with the noise criterion, a limited amount of daytime noise monitoring for 30 active minutes on a bi-weekly basis shall be carried out during construction phase to ensure the construction complying with the EIAO-TM. Details of noise monitoring and recommendation on mitigation measures during construction phase are given in Sections 2.2 and 2.3.

2.2 Construction Phase

Noise Parameters

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

Monitoring Equipment

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

2.2.3 Noise measurements should not be made in accordance with standard acoustical principles and practices in relation to weather conditions.

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

Monitoring Locations

2.2.5 The noise monitoring shall be conducted at the identified monitoring stations as shown in Table 2.1 and Figure 2.1. The status and locations of noise sensitive receivers may change after issuing this manual. If such cases exist, the Engineer shall propose updated monitoring locations and seek agreement from EPD of the proposal.

Table 2.1 Noise Monitoring Locations

NSRs	Noise Monitoring Locations
RYTE1	Yau Tong Estate (Phase 1)
REHC2	Eastern Harbour Crossing Site (Phase 2)
RSCH2	New School at Yau Tong Estate (South)

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

a) at locations close to the major site activities which are likely to have noise impacts;

b) close to the noise sensitive receivers (N.B. for the purposes of this section, any domestic premises, hotel, hostel, temporary housing accommodation, hospital, medical clinic, educational institution, place of public worship, library, court of law, performing art centre should be considered as noise sensitive receiver); and

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

2.2.7 The monitoring station shall normally be at a point 1m from the exterior of the sensitive receivers building facade and be at a position 1.2 m 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 correct of +3dB(A) shall be made to the free field measurements. Once the positions for the monitoring stations are chosen, the baseline monitoring and the impact monitoring shall be carried out at the same positions.

Baseline Monitoring

2.2.8 Baseline monitoring shall be carried out in all of the identified monitoring stations for at least one consecutive weeks prior to the commissioning of the construction work for the purpose of determining the nature and ranges of natural variation.

Impact Monitoring of Construction Noise

2.2.9 Noise monitoring shall be carried out at all the designated monitoring station. The monitoring frequency shall depend on the scale of the construction activities. The following is an initial guide on the regular monitoring frequency for each station on a per bi-week basis when noise generating activities are underway:-

· one set of measurements between 0700-1900 hours on normal weekdays.

2.2.10 No night-time construction works are scheduled to be carried out in this project. If general construction works are necessary to be carried out during restricted hours, it will be controlled by CNP system under the NCO.

2.2.11 Noise monitoring shall be carried out at the monitoring station for RSCH2 during the school examination periods. The Engineer shall liaise with the college personnel and the Examination Authority to ascertain the exact dates and times of all examination periods during the course of the contract.

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

Event and Action Plan for Noise

2.2.13 The Action and Limit levels for construction noise are defined in Table 2.2. Should non-compliance of the criteria occur, action in accordance with the Action Plan in Table 2.3 shall be carried out.

Table 2.2 Action and Limit Levels for Construction Noise

Time Period	Action	Limit
0700-1900 hours on normal weekdays	When one documented complaint is received	75* dB(A)

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

Event and Action Plan for Construction Noise

2.2.14 For the measured construction noise levels breaching the noise quality performance limits given in Table 2.2, the actions as shown in the following Table 2.3 should be taken.

Table 2.3 Event and Action Plan for Construction Noise

Limit Breached

Engineer’s Action

Contractors’ Action

Action Level

· impose daily monitoring

· notify all contractors & EPD if required

· request additional mitigation proposals

· reply letters of complaint

· take measurement

· identify noise source

· review operations

· submit mitigation proposals to Engineer

· implement remedial action

· notify Engineer of action

Limit Level

· impose daily monitoring

· notify all contractors & EPD if required

· request additional mitigation proposals

· review investigation report & forward to EPD if required

· identify noise source

· review operations

· submit mitigation proposals to Engineer

· implement remedial action

· notify Engineer of action

· render investigation report

· reschedule operations as required by Engineer

· stop the relevant portion of works as determined by the ER until the exceedance is abated

2.3 Noise Mitigation Measures

2.3.1 The contractor should be requested to adopt the following mitigation measures:-

· Scheduling of work

· Siting of facilities

· Use of Quiet Powered Mechanical Equipment (PME)

· Use of temporary noise barriers

· Adopt good site practice

Scheduling of Work

2.3.2 The Contractor has to make the choice of the number and types of construction equipment taking into account the use of quiet plant while devising a feasible work programme.

2.3.3 This includes minimizing noisy operations during examination periods; avoiding simultaneous operation of noisy equipment; retaining existing features that can act as a noise barrier until the last phase; and erecting, as early as possible, any new structures which will have the effect of screening noise sources. Such screens can reduce noise levels by 15dB(A) or more.

Siting of Facilities

2.3.4 Noisy equipment, such as emergency generators and water pumps, should always be sited as far as possible from noise sensitive receivers. Consideration should also be given to the use of structures such as site offices and stores as noise barriers.

Use of Quiet Powered Mechanical Equipment (PME)

2.3.5 The contractor should be requested to use quiet PME, whose actual SWL is less than the value specified in TM2. This is one of the most effective measures and is increasingly practicable because of the availability of quiet equipment. Examples of SWLs (or Sound Pressure Levels (SPLs) at 7m) for specific silenced PME, which are generally available in Hong Kong, are given in the following Table 2.4.

Table 2.4 Listing of Quiet PME items

Powered Mechanical Equipment (PME)	Maximum SWL, dB(A) (or SPL at 7m)
Dump Truck	110
Excavator	105
Lorry	105
Concrete Pumps	105
Compressors	100
Generators	100
Water Pumps	88
Poker Vibrator	110
Loader	105
Modern Breakers (mounted on demolition robot)	SPL 91 at 7m
Crusher (hand-held or mounted on demolition robot)	SPL 69 at 7m

Use of Temporary Noise Barriers

2.3.6 It is recommended to erect a noise barrier of 3m to 5m high along the site boundary adjoining Cha Kwo Ling Road and Ko Fai Road during the construction phase. The noise barrier should be constructed of impervious material with minimum 15kg/m2 surface density. The noise barrier would provide screening losses of 3 to 5 dB(A) and reduce the construction noise impact on the NSRs. Location of site access should be carefully chosen without significantly compromising the effectiveness of the site barriers.

2.3.7 Mobile or movable barriers that can be located close to noisy plant can be very effective at screening NSRs from particular plant. A 3 m high mobile barrier with skid footing and a small cantilevered upper portion can be located within a few metres of static plant and within about 5 m of more mobile plant such as excavators, etc. It is estimated that mobile noise barriers of this type can produce 10dB(A) of screening for static plant and 5dB(A) for mobile plant. Where these screening effects can be achieved at upper floors of NSRs, greater reduction would result at lower floors. The noise screening benefit for each plant considered in this study is listed as follows:

· stationary plant - 10dB(A) screening: compressor, water pump, concrete pump, generator, various hand tools and saw.

· mobile plant - 5dB(A) screening: excavator, loader, truck mixer, mobile crane, vibrator and breaker.

Adopt Good site practice

2.3.8 Good site practice and noise management can considerably reduce the impact of the construction sites’ activities on nearby NSRs. The following measures should be followed during each phase of construction:

· 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) 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, should, where possible, be orientated so that the noise is directed away from nearby NSRs;

· silencers or mufflers on construction equipment should be utilised and should be properly maintained during the construction period;

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

· material stackpiles and other structures should be effectively utilised, where practicable, to screen noise from on-site construction activities.

2.3.9 The implementation schedule for noise control is given in Appendix B.

2.4 Operational Phase

2.4.1 Mitigation measures are not required for the operational phase of the Reclamation.

3. WATER QUALITY

3.1 Water Quality Parameter

3.1.1 As identified in the EIA Report, a key water quality issue of the construction phase will be dredging and sandfilling works for the seawall foundations and the Phase 1 reclamation. Marine water quality monitoring shall be carried out during the construction phase to ensure that any unacceptable increase in suspended solids/turbidity and decrease in dissolved oxygen due to dredging and filling activities could be readily detected and timely action be taken to rectify the situation.

3.1.2 Dissolved oxygen (DO), turbidity and suspended solids (SS) levels shall be monitored at designated marine water quality monitoring stations during the construction phase. DO and turbidity should be measured in-situ whereas SS should be determined by laboratory.

3.1.3 The water quality impact assessment undertaken in the EIA study concluded that adverse impacts on water quality arising from the release of heavy metals in contaminated sediment are not anticipated during the dredging works. A quantification of the release of heavy metals from the sediment pore water indicated that the predicted instantaneous concentrations in the marine waters surrounding the dredging site would not exceed the UK Water Quality Standards. The monitoring of heavy metals in the water column is therefore not considered necessary during the dredging works.

3.1.4 Other relevant data shall also be recorded, such as: monitoring location/position, time, water depth, tidal stages, weather conditions and any special phenomena or work underway at the construction site.

3.1.5 The proposed water quality monitoring schedule shall be faxed to EPD on or before the first day of the monitoring month. EPD shall also be notified immediately for any changes in schedule by fax.

3.2 Monitoring Equipment

Dissolved Oxygen and Temperature Measuring Equipment

(i) The instrument should be a portable and weatherproof dissolved oxygen (DO) measuring instrument complete with cable and sensor, and use a DC power source. The equipment should be capable of measuring:

· a DO level in the range of 0‑20 mgL^-1 and 0‑200% saturation; and

· a temperature of 0‑45 degree Celsius.

(ii) It should have a membrane electrode with automatic temperature compensation complete with a cable.

(iii) Should salinity compensation not be built-in in the DO equipment, in-situ salinity should be measured to calibrate the DO equipment prior to each DO measurement.

Turbidity Measurement Instrument

3.2.1 The instrument should be a portable and weatherproof turbidity measuring instrument using a DC power source. It should have a photoelectric sensor capable of measuring turbidity between 0-1000 NTU (e.g. Hach model 2100P or an approved similar instrument).

Sampler

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

Water Depth Detector

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

Salinity

3.2.4 A portable salinometer capable of measuring salinity in the range of 0-40 part per thousand (ppt) should be provided for measuring salinity of the water at each monitoring location.

Sample Containers and Storage

3.2.5 Water samples for SS determination should be stored in high density polythene bottles with no preservative added, packed in ice (cooled to 4°C without being frozen) and delivered to the laboratory and analyzed as soon as possible after collection.

Monitoring Position Equipment

3.2.6 A hand-held or boat-fixed type digital Differential Global Positioning System (DGPS) with way point bearing indication and Radio Technical Commission for maritime (RTCM) Type 16 error message ‘screen pop-up’ facilities (for real-time auto-display of error messages and DGPS corrections from the Hong Kong Hydrographic Office), or other equipment instrument of similar accuracy, should be provided and used during marine water monitoring to ensure the monitoring vessel is at the correct location before taking measurements.

Calibration of In-Situ Instruments

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

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

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

3.3 Laboratory Measurement / Analysis

3.3.1 Duplicate samples from each independent sampling event are required by EPD for all parameters. Analysis of suspended solids shall be carried out in a HOKLAS or other international accredited laboratory. Water samples of about 1000 ml shall be collected at the monitoring stations for carrying out the laboratory SS determination. The detection limit shall be 1 mgL^-1 or better. The SS determination work shall start within 24 hours after collection of the water samples. The SS determination shall follow APHA 19ed 2540D or equivalent methods subject to approval of EPD.

3.3.2 If a site laboratory is set up or a non-HOKLAS and non-international accredited laboratory is hired for carrying out the laboratory analysis, the laboratory equipment, analytical procedures, and quality control shall be approved by EPD. All the analysis shall be witnessed by the ER. The ET Leader shall provide the ER with one copy of the relevant chapters of the “APHA Standard Methods for the Examination of Water and Wastewater” 19th edition and any other relevant document for his reference.

3.3.3 Additional duplicate samples may be required by EPD for inter laboratory calibration. Remaining samples after analysis shall be kept by the laboratory for 3 months in case repeat analysis is required. In any circumstance, the sample testing shall have comprehensive quality assurance and quality control programmes. The laboratory shall prepare to demonstrate the programmes to EPD or his representatives when requested.

3.4 Monitoring Locations

3.4.1 The marine water quality monitoring stations during the construction works are shown in Figure 3.1. These stations are chosen based on the following criteria:

(i) Locations close to the boundary of the mixing zone, i.e. to just outside the sediment plume generated by dredging and filling works (as indicated in the EIA Report);

(ii) Close to the sensitive receptors (i.e. the seawater intakes of the operating saltwater pumping stations) which are directly or likely to be affected;

(iii) For monitoring locations located in the vicinity of the sensitive receptors, care should be taken to cause minimal disturbance during monitoring; and

(iv) Two or more control stations which shall be at locations representative of the project site in its undisturbed condition. Control stations should be located, as far as is practicable, both upstream and downstream of the works area.

3.4.2 The co-ordinates of the proposed monitoring stations are listed in Table 3.1. As shown on Figure 3.1, the proposed locations for the sensitive receiver monitoring stations represent the sensitive receivers which are predicted to be affected by the sediment plume modelling undertaken in the EIA Study. The model simulations of the mitigated dredging and filling works indicate that the sediment plume is confined to the vicinity of Yau Tong Bay for both the dry season and wet season, spring and neap tides. The seawater intakes located along the waterfront of Hong Kong Island are shown not to be affected by the mitigated dredging and filling works (Section 4.7.2.1 of EIA Report).

Table 3.1 Proposed Marine Water Quality Monitoring Stations

Station	Easting	Northing
S1 (Dairy Farm Ice Factory Saltwater Intake)	841855	817664
S2 (Existing WSD Cha Kwo Ling Saltwater Pumping Station (CKLSPS))*	841895	817667
S3 (Operating WSD Yau Tong Saltwater Pumping Station (YTSPS))*	842196	817071
M1	841156	817377
M2	841683	817052
C1	840286	817536
C2	842196	816536

Note: *Depending on the progress of various projects, station S3 will be located close to the operating YTSPS (either the existing YTSPS or the reprovisioned YTSPS). Station S2 will be located at the existing CKLSPS since the CKLSPS can only be reprovisioned after the completion of the reclamation.

3.4.3 Control stations are necessary to compare the water quality from potentially impacted sites with the ambient water quality. Control stations shall be located within the same body of water as the impact monitoring stations but should be outside the area of influence of the works and, as far as practicable, not affected by any other works.

3.4.4 Measurements shall be taken at 3 water depths, namely, 1 m below water surface, mid-depth and 1 m above seabed, except where the water depth is less than 6 m, the mid-depth station may be omitted. Should the water depth be less than 3 m, only the mid-depth station will be monitored. The status and locations of water sensitive receivers and the marine activities may change after issuing this Manual. If such cases exist, the ET Leader shall propose with justification for changes to monitoring locations or other requirements of the EM&A programme, and seek approval from the IC(E) and DEP [and Director of Agriculture, Fisheries and Conservation (DAFC) if monitoring locations for mariculture zones are involved].

3.5 Baseline Monitoring

3.5.1 Baseline conditions for marine water quality shall be established and agreed with EPD prior to the commencement of works. The purposes of the baseline monitoring are to establish ambient conditions prior to the commencement of the works and to demonstrate the suitability of the proposed impact and control monitoring stations. The baseline conditions shall normally be established by measuring the water quality parameters specified in Section 3.1. The measurements shall be taken at all designated monitoring stations including control stations, three days per week, at mid-flood and mid-ebb tides, for at least four weeks prior to the commencement of marine works.

3.5.2 Other relevant data shall also be recorded, such as: monitoring location/position, time, water depth, tidal stages, weather conditions and any special phenomena underway near the monitoring station. There shall not be any marine construction activities in the vicinity of the stations during the baseline monitoring.

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

3.5.4 Baseline monitoring schedule shall be faxed to EPD one week prior to the commencement of baseline monitoring. The interval between two sets of monitoring shall not be less than thirty-six hours.

3.6 Impact Monitoring

3.6.1 During the dredging and filling works for the seawall foundation and reclamation construction, monitoring shall be undertaken three days per week, at mid-flood and mid-ebb tides, with sampling/measurement at the designated monitoring stations. The interval between two sets of monitoring shall not be less than thirty-six hours except where there are exceedances of Action and/or Limit levels, in which case the monitoring frequency will be increased.

3.6.2 If the impact monitoring results indicate that dredging/filling works have caused adverse impacts on water quality at the monitoring stations close to the salt water intakes (for instance, non-compliance with WSD’s seawater quality standards), appropriate actions including the lowering of production rates for dredging and filling, or rescheduling of works to avoid the peak saltwater intake hours, should be taken and additional mitigation measures should be implemented as necessary.

3.7 Post-construction Monitoring

3.7.1 Upon completion of all marine-based construction activities, a post-project monitoring exercise on water quality shall be carried out for 4 weeks in the same manner as the impact monitoring, plus monitoring of ammoniacal nitrogen and E. coli. The necessity of additional 6-month post-water quality monitoring will be subject to the results obtained after the 4-week monitoring period at the Cha Kwo Ling Saltwater intake. For other sensitive receivers, a 4-week post-project monitoring will be adequate. Whenever the proposed mitigation measures failed to maintain the water quality within the WSD’s WQOs, further mitigation measures should be proposed and implemented. If further mitigation measures are still found to be ineffective, remedial actions (such as relocation of the pumping station) should be proposed and implemented.

3.8 Environmental Quality Performance Limits

3.8.1 Marine water quality criteria, namely Action and Limit levels, are shown in Table 3.2. These criteria should be applied to ensure that any deteriorating water quality could be readily detected. When the monitoring results of the water quality parameters at any designated monitoring stations exceed the water quality criteria, the actions in accordance with the Event and Action Plan in Table 3.3 shall be carried out.

3.8.2 It is recommended that if monitoring results indicate that the dredging or filling works have caused an adverse impact on water quality at the WSD saltwater pumping stations or Dairy Farm Factory saltwater cooling intake, WSD should be informed. Additional mitigation measures should be recommended to rectify the non-compliance or the construction programme should be carefully reviewed so as to slow down the rate of dredging or filling such that the water quality at these sensitive receivers is in compliance with the WQOs or WSD’s seawater quality standards. The working schedule and the mitigation measures should be reviewed by the Contractor, the IC(E), the ET Leader and the ER, and if necessary, works should be slowed down or suspended until such impact is reduced to an acceptable level.

3.8.3 The ET Leader should assess the effectiveness and efficiency of the proposed mitigation measures and/or remedial actions for the on-going construction activities. The performance of the environmental management system (i.e. of the overall EM&A programme) should be reviewed by the ET Leader on a quarterly basis. The findings of this review should be included in the quarterly EM&A summary reports, together with any recommendations to improve the performance of the EM&A programme.

Table 3.2 Action and Limit Levels for Marine Water Quality

Parameters	Action	Limit
DO in mgL^-1 (Surface, Middle & Bottom)	Surface & Middle 5 percentile of baseline data for surface and middle layer Bottom 5 percentile of baseline data for bottom layer	Surface & Middle 4 mgL^-1 or 1 percentile of baseline data for surface and middle layer Bottom 2 mgL^-1 or 1 percentile of baseline data for bottom layer
SS in mgL^-1 (depth-averaged)	95 percentile of baseline data or 120% of upstream control station's SS at the same tide of the same day	99 percentile of baseline or 130% of upstream control station's SS at the same tide of the same day
SS in mgL^-1 (surface layer at monitoring stations close to WSD seawater intakes)	10	20
Turbidity in NTU (depth-averaged)	95 percentile of baseline data or 120% of upstream control station's Turbidity at the same tide of the same day	99 percentile of baseline or 130% of upstream control station's Turbidity at the same tide of the same day

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 and SS, non-compliance of the water quality limits occurs when monitoring result is higher than the limits.

4 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.

Event	ET Leader	IC(E)	ER	Contractor
Action level being exceeded by one sampling day	Repeat in-situ measurement on next day of exceedance to confirm findings; Identify source(s) of impact; Inform IC(E), contractor and ER; Check monitoring data, all plant, equipment and Contractor's working methods. If exceedance occurs at Sensitive Receiver Monitoring Stations: Inform WSD.	Check monitoring data submitted by ET and Contractor’s working methods.	Confirm receipt of notification of non-compliance in writing; Notify Contractor.	Inform the ER and confirm notification of the non-compliance in writing; Rectify unacceptable practice; Amend working methods if appropriate.
Action level being exceeded by two or more consecutive sampling days	Repeat measurement on next day of exceedance to confirm findings; Identify source(s) of impact; Inform IC(E), contractor, ER and EPD; Check monitoring data, all plant, equipment and Contractor's working methods; Discuss mitigation measures with IC(E), ER and Contractor; Ensure mitigation measures are implemented; Increase the monitoring frequency to daily until no exceedance of Action level. If exceedance occurs at Sensitive Receiver Monitoring Stations: Inform WSD	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 ER accordingly; Supervise the implementation of mitigation measures.	Discuss with IC(E) on the proposed mitigation measures; Ensure mitigation measures are properly implemented; Assess the effectiveness of the implemented mitigation measures.	Inform the Engineer and confirm notification of the non-compliance in writing; Rectify unacceptable practice; Check all plant and equipment and consider changes of working methods; Submit proposal of additional mitigation measures to ER within 3 working days of notification and discuss with ET, IC(E) and ER; Implement the agreed mitigation measures.
Limit level being exceeded by one sampling day	Repeat measurement on next day of exceedance to confirm findings; Identify source(s) of impact; Inform IC(E), contractor, ER and EPD; Check monitoring data, all plant, equipment and Contractor's working methods; Discuss mitigation measures with IC(E), ER and Contractor. If exceedance occurs at Sensitive Receiver Monitoring Stations: Inform WSD	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 ER accordingly.	Confirm receipt of notification of failure in writing; Discuss with IC(E), ET and Contractor on the proposed mitigation measures; Request Contractor to review the working methods.	Inform the ER and confirm notification of the non-compliance in writing; Rectify unacceptable practice; Check all plant and equipment and consider changes of working methods; Submit proposal of mitigation measures to ER within 3 working days of notification and discuss with ET, IC(E) and ER;
Limit level being exceeded by two or more consecutive sampling days	Repeat measurement on next day of exceedance to confirm findings; Identify source(s) of impact; Inform IC(E), contractor, ER and EPD; Check monitoring data, all plant, equipment and Contractor's working methods; Discuss mitigation measures with IC(E), ER and Contractor; Ensure mitigation measures are implemented; Increase the monitoring frequency to daily until no exceedance of Limit level for two consecutive days. If exceedance occurs at Sensitive Receiver Monitoring Stations: Inform WSD.	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 and advise the ER accordingly; Supervise the implementation of mitigation measures.	Discuss with IC(E), ET and Contractor on the proposed mitigation measures; Request Contractor to critically review the working methods; Make agreement on the mitigation measures to be implemented; Ensure mitigation measures are properly implemented; Consider and instruct, if necessary, the Contractor to slow down or to stop all or part of the construction activities until no exceedance of Limit level.	Take immediate action to avoid further exceedance; Submit proposal of mitigation measures to ER within 3 working days of notification and discuss with ET, IC(E) and ER; Implement the agreed mitigation measures; Resubmit proposals of mitigation measures if problem still not under control; As directed by the Engineer, to slow down or to stop all or part of the construction activities until no exceedance of Limit level.

3.9 Water Quality Mitigation Measures

Construction Phase

3.9.1 It is important that appropriate measures be undertaken to ensure that potential impacts on water quality during construction can be kept to within acceptable levels as defined by the WQO. Temporary mitigation measures are necessary to protect the water sensitive receivers (WSRs), so that the WSD’s seawater quality standards and other in-house water quality standards at saltwater intakes can be satisfied. The use of appropriate dredging and filling methods will reduce the amount of sediment suspension, and, in turn, minimize adverse impacts on the WSRs.

Implementation of the following measure to avoid the accumulation of the pollutants within the embayed water during construction:

· Construct a temporary channel / culvert to divert the existing culvert outfalls out of the YTB before the commencement of marine works.

Implementation of the following measures for dredging and filling works during seawall construction:

· Use of closed grab dredgers for mud dredging for seawall foundation.

· Place silt curtains around closed grab dredgers during the dredging and filling of seawall foundation.;

· Design and provision of a single layer of silt screens (typically made from synthetic geotextile fabrics) across the Dairy Farm saltwater intake and the intakes of the WSD YTSPS and CKLSPS.;

· Maximum daily production rate during the seawall construction shall not exceed 1,550 m³ day^-1 for dredging and 2,200 m³ day^-1 for sand filling.; and

· Inspection and maintenance of the silt screens and curtains.

Implementation ofor the following measures for dredging and filling works during Phase 1 and Phase 2 reclamation:

· Bulk filling (by bottom dumping) in Phase 1 and Phase 2 reclamation should commence after the completion of seawall construction.

· A single layer of silt curtain (made from impervious material such as coated nylon) will be placed across the seawall opening before bottom dumping in Phase 1 and Phase 2 reclamation.

· Design and provision of double layers of silt screens across the saltwater intakes at the Dairy Farm Ice Factory, the WSD YTSPS and CKLSPS.

· Maximum daily production rate shall not exceed 10,000 m³ day ^–1 for sand filling in Phase 1.

· Maximum daily production rate shall not exceed 6,000 m³ day ^–1 for sand filling in Phase 2.

· Inspection and maintenance of the silt screens and curtains through visual inspection and review of marine water quality at the intakes.

· Should the monitoring results indicate continuous non-conformance, proposal of additional mitigation measures should be submitted by the contractor and developer’s representative in accordance with the Event and Action Plan (Table 3.2).

Implementation of following measures for dredging and filling works during Phase 3 construction of proposed concrete decking near the mouth of YTB:

· Provision of double layers of silt screens (typically made from synthetic geotextile fabrics) across the saltwater intakes at the Dairy Farm Ice Factory, the WSD’s Cha Kwo Ling and Yau Tong saltwater pumping stations.

· Inspection and maintenance of the silt screens through visual inspection and review of marine water quality at the intakes; and

· If the monitoing results indicate continuous non-conformance, the contractor should propose additional mitigation measures.

Design Consideration for the Future Potential Reprovisioned Cha Kwo Ling WSD Saltwater Intake under Full Reclamation Option

3.9.2 If it is the intention of WSD to relocate the existing CKLSPS and Full Reclamation Option is adopted, then the intake of the future potential reprovisioned CKLSPS should be located below -2.0 mPD to avoid abstracting the surface sewage plume from any discharge from the Yau Tong Sewage Pumping Station emergency outfall.

3.9.3 Optimal intake configuration should be reviewed and decided at the detailed design stage for the reprovisioning of the CKLSPS.

Good Operational Practices

3.9.4 Implementation of the following measures for minimizing potential adverse potential impacts:

· minimize disturbance to the seabed while dredging;

· minimize leakage of dredged material during lifting;

· prevent loss of material during transport of dredged material;

· prevent discharge of dredged material except at approved locations;

· dredging operations should involve leaving sediment in place whenever practicable; and

· ensure that the construction works will cause no visible foam, oil, grease, scum, litter or other objectionable matter to be present in the water within and adjacent to the site or dumping grounds.

3.9.5 The licensee should formulate his design and construction methods with these factors in mind, and provide specification in the tender submission.

3.9.6 The contractor should provide the work schedule of the dredging and filling activities to WSD before the commencement of construction works.

Pollution Avoidance Measures During Dredging and Dumping

3.9.7 Implementation of the following measures for pollution avoidance during dredging and dumping:

· mechanical grabs shall be designed and maintained to avoid spillage and shall seal tightly while being lifted (closed-grab clamshell dredgers);

· all vessels shall be sized such that adequate clearance is maintained between vessels and the sea bed at all states of the tide to ensure that undue turbidity is not generated by turbulence from vessel movement or propeller wash;

· all pipe leakages shall be repaired promptly and plant shall not be operated with leaking pipes;

· excess material shall be cleaned from the decks and exposed fittings of barges before the vessel is moved;

· adequate freeboard shall be maintained on barges to ensure that decks are not washed by wave action;

· all barges shall be fitted with tight fitting seals to their bottom openings to prevent leakage of material; and

· loading of barges shall be controlled to prevent splashing of dredged material to the surrounding water, and barges shall not be filled to a level which will cause the overflow of materials or polluted water during loading or transportation.

Contaminated Marine Sediments

3.9.8 Implementation of the following special EPD procedures for avoidance of pollution during contaminated mud handling:

(a) Uncontaminated mud shall not be dumped other than in dumping grounds as may be approved for the purpose by the Director of Environmental Protection (DEP) and in accordance with the Dumping at Sea Ordinance. If the contaminated mud cannot be left in situ, it shall be dumped at East Sha Chau Contaminated Mud Disposal Pits (CMPs) or other disposal pits as may be approved for the purpose by the DEP. The Contractor shall be responsible for obtaining all necessary licences for these operations.

(b) When the Contractor dumps the contaminated mud at East Sha Chau CMPs, he shall place the contaminated mud at a location and in such a manner as directed by the Management Team of the Civil Engineering Department. The Contractor shall proceed with the disposal operation as instructed by the Management Team and in accordance with guidance notes which are issued by the Management Team. The Contractor shall not carry out any dumping without permission of the Management Team or when the Management Team is not in operation.

(c) The Contractor shall carry out the dumping operation in strict accordance with the method statement agreed by the DEP, any non-compliance with the agreed method shall be a breach of conditions of the relevant licence issued by the DEP and is an offence under the Dumping at Sea Ordinance.

(d) When dredging, transporting and disposing of designated contaminated marine mud, the Contractor shall implement additional special procedures for the avoidance of pollution which shall include, but not be limited to, the following:

(i) employ a grab dredger with a closed watertight grab for dredging of designated contaminated marine mud;

(ii) transport designated contaminated marine mud by split barge of not less than 750m³ capacity, well maintained and capable of rapid opening and discharge at the disposal site;

(iii) design properly and maintain carefully all operational plant so as to minimize the risk of sediments or other pollutants being released into the water column and deposited in the seabed other than designated locations. The Contractor’s work shall cause no visible foam, oil, grease, scum, litter or other objectionable matter to be present in the water within the site;

(iv) fit all barges with tight fitting seals to their bottom openings to prevent leakage of material;

(v) release the mud rapidly and close the hoppers immediately; any material adhering to the sides of the hopper shall not be washed out of the hopper and the hopper shall re-closed until the barge next returns to the disposal site. The Contractor shall ensure that the dumping vessel shall be stationary throughout the dumping operation;

(vi) size all vessels such that adequate clearance is maintained between the seabed and vessels at all states of the tide, to ensure that undue turbidity is not generated by turbulence from vessel movement or propeller wash. Adequate freeboard shall be maintained on barges to ensure that decks are not washed by wave action;

(vii) employ only barges equipped with automatic self-monitoring devices for the dumping operation, and shall co-operate with and facilitate the DEP to inspect the device and retrieve the record stored in the device on a regular basis;

(viii) provide experienced full time personnel on board all dumping vessels and provide suitable training to ensure that appropriate methods to minimize pollution are implemented. Records shall be maintained to satisfy the DEP that there is no short dumping or dumping outside the Designated Dumping Area. The Contractor shall also make available to the DEP and the secretary of Marine Fill Committee (S/MFC), Civil Engineering Department, at any time upon the written request of the DEP, all information and records relevant to the dredging and mud disposal operation. This information shall include, but not be limited to, all data on the plant used by the Contractor, up-to-date periodic data on production rates and record copies of Notification of Dumping which have been sent to the Management Team, etc.

Operation Phase

3.9.9 In the present study, it was found that the proposed YTB reclamation will have negligible effect on the flow condition within Victoria Harbour and thus, unacceptable water quality is not expected in the long run. In view of the concern expressed by WSD regarding potential emergency sewage discharge at the Yau Tong Sewage Pumping Station (as the pumping station is located in the vicinity of WSD’s saltwater pumping station), it is proposed that a communication channel be established between WSD and DSD for dealing with this event.[1] It is recommended that this communication procedure between the two government departments be established at the detailed design stage. Should discharge of sewage be made through the emergency outfall, DSD should inform WSD of the details of such discharge, e.g. volume, timing and duration, in advance where possible. It is also recommended that DSD should minimize the discharge and liaise with WSD to avoid discharge during the peak operation hours of WSD’s saltwater pumping station.

3.9.10 To avoid accumulation of floating debris at water below the decked promenade near the intake of existing CKLSPS, floating booms shall be deployed near the intake and any floating debris detained by the floating booms should be collected and removed regularly. Air slots should be included in the detailed design of the decked promenade to enhance the air flow below.

3.9.11 No other mitigation measure is recommended for the operation phase in the present study. Furthermore, the scope of the present EIA study covers mainly the environmental impact of the Yau Tong Bay reclamation during the construction phase. The impact of the subsequent development on the reclaimed land will be addressed under a separate EIA study. Hence, mitigation measures, if any, for the subsequent development will be addressed in the corresponding EIA study.

3.9.12 The implementation schedule for water pollution control is given in Appendix C.

4. WASTE MANAGEMENT

4.1 Introduction

4.1.1 Waste management will be the contractor’s responsibility to ensure that all wastes produced during the construction of the proposed YTB reclamation are handled, stored and disposed of in accordance with good waste management practices and EPD’s regulations and requirements. The contractor will be required to ensure that loss of dredged material does not take place during transportation of the material in barges to the designated marine disposal ground.

4.1.2 Other waste materials generated during construction activities, such as construction and demolition (C&D) materials, chemical wastes and general refuse from the workforce, are recommended to be audited at regular intervals (at least monthly) to ensure that proper storage, transportation and disposal practices are being implemented. This monitoring of waste management practices will ensure that these solid and liquid wastes generated during construction are not disposed into the surrounding marine waters. The Contractor will be responsible for the implementation of any mitigation measures to minimise waste or redress problems arising from the waste materials.

4.2 Waste Control and Mitigation Measures

4.2.1 Mitigation measures for waste management are summarised below. With the appropriate handling, storage and removal of waste arisings during the construction of the proposed YTB reclamation as defined below, the potential to cause adverse environmental impacts will be minimized. The implementation schedule of recommended mitigation measures for waste management is presented in Appendix D.

Construction Phase

Marine Sediments

4.2.2 In order to minimize any potential adverse effects from marine sediment disposal, the Hong Kong Government has allocated gazetted marine disposal areas which are allocated by the Marine Fill Committee (MFC) and EPD, depending on the quantities and the levels of contamination of the spoil to be disposed (Works Bureau Technical Circular (WBTC) Nos. 3/2000 and 12/2000).

4.2.3 The dredged marine sediments will be loaded onto barges and transported to designated disposal sites depending on their level of contaminants. The majority of the marine sediments to be dredged for the YTB reclamation fall into Class C contaminated material (or Category H sediment (biological test not required)). The dredged contaminated mud shall be transported with great care and disposed at the East Sha Chau Contaminated Mud Pits which is designated for the disposal of contaminated mud. Dredged sediments identified as Category L and Category M sediment passing biological test will be suitable for open sea disposal.

4.2.4 A sediment sampling and testing programme will be required at the design stage of the Project in accordance with the requirements of WBTC No. 3/2000. To determine the disposal requirements of the dredged sediment along the seawall foundation and at the bored pile seawall identified as Category H with contaminant levels 10 times higher than the LCEL, Tier III biological screening (dilution test) would be required. The need for any special treatment/disposal procedures for dredged sediments from the YTB reclamation would be examined in detail at the design stage of the Project, as necessary, based on the results of biological screening. The recommended special disposal methodology is the sealing of dredged contaminated sediments in geosynthetic containers in the hopper barge and to drop the geosynthetic containers with the contaminated sediment into the designated contaminated mud pit at East Sha Chau, where it would be covered by further mud disposal and later by the mud pit capping, thereby meeting the requirements for fully confined mud disposal.

4.2.5 In the event that the biological test results show that special disposal arrangements are necessary, field trials are recommended to be undertaken during the detailed design site investigation stage (using uncontaminated mud) to establish the optimum container capacity and handling method, and to demonstrate the effectiveness of the recommended disposal method.

4.2.6 The following are the measures for minimizing potential impacts during transportation and disposal of the dredged marine sediments:

· Bottom opening of barges and hopper dredgers shall be fitted with tight fitting seals to prevent leakage of material. Excess material shall be cleaned from the decks and exposed fittings of barges and dredgers before the vessel is moved.

· Loading of barges and hopper dredgers shall be controlled to prevent splashing of dredged material to the surrounding water, and barges or hoppers shall not be filled to a level which will cause the overflow of materials or polluted water during loading or transportation.

· Employ only transport barges or vessels equipped with automatic self-monitoring devices for the dumping operation, as specified by the Director of Environmental Protection (DEP). The Contractor shall co-operate with and facilitate the DEP to inspect the device and retrieve the record stored in the device on a regular basis.

·Records shall be maintained to satisfy the DEP that there is no short dumping or dumping outside the Designated Dumping Area. The Contractor shall also make available to the DEP and the secretary of Fill Management Committee (S/FMC), Civil Engineering Department (CED), at any time upon the written request of the DEP, all information and records relevant to the dredging and mud disposal operation. This information shall include, but not be limited to, all data on the plant used by the Contractor, up-to-date periodic data on production rates and record copies of Notification of Dumping which have been sent to the Management Team of CED.

Good Site Practice and Waste Reduction Measures

4.2.7 In order to minimize the potential for adverse impacts on the environment, it is recommended that good site practices and waste reduction measures be adhered to, as follows:

· The reuse and recycling of materials wherever possible.

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

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

· Provision of an enclosed transfer facility for storage and containment.

· Separation of chemical wastes for special handling and appropriate treatment at the Chemical Waste Treatment Facility.

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

To minimize the potential impact on health and safety/contamination exposure during the special disposal arrangements for the seriously contaminated sediments, the following protective measures should be followed:

· No unauthorized persons shall be allowed into the works areas, and necessary precautions shall be taken to prohibit unauthorized entry to the Site or works areas.

· Eating, drinking, smoking or any practice that increases the probability of hand to mouth transfer and ingestion of material is prohibited .

· Food, beverages, tobacco products, etc, are prohibited in any area designated as being contaminated. Adequate warning signs shall be posted to this effect.

· Hands must be thoroughly washed upon leaving the works area, and before eating, drinking or any other activities.

· All field personnel shall wear protective gear such as gloves to minimize exposure to any contaminated material.

4.2.8 A trip-ticket system should be included as one of the contractual requirements and implemented by the Environmental Team so as to monitor the disposal of C&D material and solid wastes at public filling areas and landfills, and to control fly-tipping. An Independent Checker (Environment) should be responsible for auditing the result of the system.

4.2.9 Good management and control can 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 to achieve waste reduction are as follows:

Planning and Design Stage

· Drained reclamation technique to minimize volume of dredged materials.

· Public fill generated from demolition works to be re-used on-site in the reclamation works as far as practicable to reduce off-site disposal.

Construction Stage

· 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.

· To encourage collection of aluminum cans by individual collectors, separate labeled bins should be provided to segregate this waste from other general refuse generated by the workforce.

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

· Prior to disposal of C&D waste, it is recommended that wood, steel and other metals 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 to minimise the potential for damage or contamination of construction materials.

· Plan and stock construction materials carefully to minimize amount of waste generated and avoid unnecessary generation of waste.

4.2.10 A recording system for the amount of wastes generated, recycled and disposed (including the disposal sites) should be proposed. Quantities could be determined by weighing each load or other suitable methods.

4.2.11 In addition to the above good site practices and waste reduction measures, specific mitigation measures are recommended below for the identified construction waste arisings :

General Site Wastes

· A collection area should be provided where waste can be stored and loaded prior to removal from site. An enclosed and covered area is preferred to reduce the occurrence of 'wind blow' light material. If an open area is unavoidable for the storage or loading/unloading of wastes, then the area should be bunded and all the polluted surface run-off collected within this area should be diverted into sewers.

Workforce Wastes

· Suitable collection sites around site offices and canteen will be required. It is recommended that for environmental hygiene reasons and to minimise odour, putrescible wastes are not stored for a period exceeding 48 hours, however, removal every 24 hours is preferable.

Maintenance and Chemical Wastes

· Any chemical wastes (e.g. cleaning fluids, solvents, lubrication oil and fuel) should be handled according to the Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes.

· Spent chemicals shall be disposed to a licensed treatment facility such as the Chemical Waste Treatment Facility (CWTF) located at Tsing Yi, which is designed to treat most of the chemical waste from the territory.

· Any service shop and minor maintenance facilities should be located on hard standings within a bunded area, and sumps and oil interceptors should be provided. Maintenance of vehicles and equipment involving activities with potential for leakages and spillage should only be undertaken with the areas appropriately equipped to control these discharges.

· The contractor should contact EPD and the contractor operating the CWTF, who offer a chemical waste collection service.

· The contractor shall check to ensure that the handling methods for the wastes in question are appropriate, and that separation of chemical wastes from other waste arisings is conducted.

· Any other contractor employed for the collection of chemical waste must be a registered chemical waste collector in accordance with the Chemical Waste (General) Regulation.

4.2.12 Should asbestos containing materials (ACM) be found in the buildings scheduled for demolition at the site, the ACM should be removed by registered contractors and disposed of at a designated landfill site. Where temporary on-site storage of ACM is necessary, the storage facilities should be designed in accordance with the Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes issued by EPD.

Construction and Demolition Material ~~and Infrastructure Wastes~~

· It is recommended that the selective demolition method be employed to minimize the effort of sorting mixed C&D materials. This requires a proper demolition sequence to remove material of the same category at a time.

· C&D material shall be separated on-site into C&D wastes (non-inert material) and public fill (inert material). The former, such as wood, glass, plastic, steel and other metals shall be reused or recycled and, as a last resort, disposed of to landfill. The latter, such as concrete and rubble, shall be disposed of to a public filling area.

· A suitable area should be designated to facilitate the sorting process and a temporary stockpiling area will be required for the separated materials. Considering that a large quantity of C&D material will be generated from the demolition works and in order to minimise the impact resulting from collection and transportation of material for off-site disposal, public fill should be re-used on-site in the reclamation works where possible.

· When disposing ~~C&D material~~ public fill at a public filling area, ~~the material~~ it should ~~shall~~ only consist of earth, building debris and broken rock and concrete. The material shall be free from marine mud, household refuse, plastic, metals, industrial and chemical waste, animal and vegetable matter, and other material considered to be unsuitable by the public filling supervisor. Small quantities of timber mixed with otherwise suitable material would be permitted.

4.2.13 The Contractor shall pay attention to the Waste Disposal Ordinance, the Dumping at Sea Ordinance, the Public Health and Municipal Services Ordinance and the Water Pollution Control Ordinance, and carry out the appropriate waste management work. The relevant licence/permit, such as the chemical waste producer registration, etc. shall be obtained. The Contractor shall refer to the relevant booklets issued by EPD when applying for the licence/permit.

4.2.14 Nomination of an approved personnel (such as a site manager), to be responsible for good site practices and effective arrangements for collection and disposal to an appropriate facility of all wastes generated at the works area, is recommended. Training of site personnel in proper waste management and chemical handling procedures shall be undertaken.

4.2.15 During the site inspections as described in Sections 8.1 of this Manual, the ET Leader shall pay special attention to the issues relating to waste management, and check whether the Contractor has followed the relevant contract specifications and the procedures specified under the laws of Hong Kong. Stringent control and audit will be necessary to ensure that effective waste management practices and correct storage, transportation and disposal requirements for the various waste materials are being implemented.

5. BIOGAS RISK ASSESSMENT

5.1 Introduction

5.1.1 The biogas risk assessment carried out in the EIA study recommended that a precautionary principle be applied as sensitive ‘at risk’ rooms were identified at the proposed YTB development (both at ground level and below ground). Gas protection measures are therefore recommendedhave therefore been proposed to be incorporated in the building design. These recommended mitigation measures to prevent the ingress and/or accumulation of any methane gas emissions to potentially dangerous concentrations are described in Section 5.5. Precautionary measures to be taken prior to entry into any below ground services or confined space within the reclamation site are also recommended. The EIA Report recommended that gas monitoring be undertaken in the immediate post-reclamation period to measure methane concentrations in the fill and to determine actual rates of methane gas emissions. The recommended monitoring requirements are detailed below.

5.1.2 With the incorporation of the recommended gas protection measures in the design of the development together with the implementation of the other recommended precautionary measures, the risk to people and property due to biogas emissions from the reclamation is considered to be low. The EIA Report proposed that the results of the recommended gas monitoring at the YTB reclamation be reviewed against a trigger value to determine the extent and type of mitigation measure requirements to be incorporated in the detailed design of the proposed development. the predicted methane flux. Should the measured rates of methane gas emissions be substantially less than the predicted rate in the EIA Report, further discussions would be held with EPD to re-examine the mitigation measure requirements to be incorporated in the detailed design of the development.

5.2 Borehole Monitoring

5.2.1 Monitoring should be undertaken via purposely installed monitoring wells within boreholes drilled into the fill material. The boreholes should be drilled down to the level of the groundwater (mean sea water level) and standard landfill gas-type monitoring wells installed. These should be fitted with a removable cap and gas monitoring valve so that gas concentrations may be measured as well as flow rates from the open well. During the drilling of boreholes, the safety and working procedures described in the Landfill Gas Hazard Assessment Guidance Note, EPD (1997) should be followed.

5.2.2 Concentrations of methane gas should be measured using portable gas monitoring instruments, as described in paragraph 5.4.1. Fluxes should also be measured if the emission velocities are not too low. It is recommended that monitoring be undertaken monthly for a period of at least one year prior to the commencement of construction works on the reclamation. The results of the gas monitoring should be reviewed to determine whether the length of the monitoring period should be extended beyond one year. It is also recommended that gas flow rates from the wells be monitored under different meteorological conditions and to include some occasions when atmospheric pressure is falling quite quickly (e.g. immediately preceding a typhoon).

5.3 Monitoring Locations

5.3.1 Proposed locations for borehole monitoring are shown in Figures 5.1a and 5.1b, and comprise locations within the reclamation site and near the reclamation perimeter. The monitoring wells located near the perimeter would need to be placed a distance of approximately 20 metres from the existing seawalls as the rubble mounds for this type of seawall usually extend between 15 to 20 metres.

5.3.2 Where possible, it is recommended that monitoring wells be located in areas designated for open space as it may be possible to continue monitoring at these locations throughout the construction period. Monitoring wells should be located away from the areas dredged for the permanent stormwater culvert (as shown on Figures 2.2a and 2.2c of the EIA Report) and the temporary channel/culvert construction (as shown on Figure 2.2a of the EIA Report).

5.4 Monitoring Equipment

5.4.1 Monitoring shall be carried out using intrinsically safe, portable gas monitoring instruments. The gas monitoring instrument shall:

· Be capable of continuous monitoring of methane;

· Be capable of continuous barometric pressure and gas pressure measurements;

· Be capable of monitoring temperature of the gas;

· Where possible, comply with BS6020 and be approved by BASEEFA as intrinsically safe, suitable for use in a Zone 2 area to BS5345;

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

· Display any parameters monitored by clear unambiguous readings given on an alpha numeric display LCD screen with wide angle viewing;

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

· Store monitoring date, and shall be capable of being down-loaded directly to a PC;

· Measure in the following ranges:

- methane 0-100% LEL & 0-100% v/v

- barometric pressure mBar (absolute)

- gas pressure (relative to atmospheric) Pascals atmospheric

- temperature 0-100°C

· Have removable and rechargeable batteries with more than 12 hours continuous operating life;

· Have back-up batteries;

· Have an oxygen sensor with a life of not less than twelve months and other sensors shall have a life of more than two years before deterioration in performance of the sensor.

5.4.2 To measure the gas flow rates from the open monitoring wells, very sensitive techniques (such as micro-anemometer) will need to be used to measure the anticipated very low flow rates.

5.4.2 The gas monitoring equipment shall be calibrated and maintained in accordance with the manufacturer’s recommendations for calibration and maintenance.

5.4.3

5.5 Mitigation Measures

5.5.1 The mitigation measures recommended in the EIA Report are described below, and comprise precautionary gas protection measures to be incorporated in the design of the development, precautions to be taken during construction works on the reclamation, and measures to be taken prior to entry of any below ground services or confined space within the reclamation site.

Precautionary Gas Protection Measures

General Guidelines

5.5.2 At this stage it is difficult to formulate specific guidelines on what measures would be required for the measured rates of gas emission as this would depend on the detailed design of the individual buildings to be constructed. The following criteria may be used as general guidelines. The maximum “safe” rate of methane gas emission of 10 L m^-2 per day derived from the Waste Management Paper No. 26A on Landfill Completion is proposed to be adopted as the trigger value.

Scenario 1

If rates of methane emission are consistently much less than the trigger value (10 L m^-2 per day), including monitoring occasions when atmospheric pressure is falling rapidly, then it is considered that the buildings will not require gas protection measures.

The trigger value is an area emission rate (that is, rate at which gas is emitted per unit area of the reclamation). In order to convert this into an emission rate from a borehole, it is necessary to make an assumption about the "area of influence" of a freely venting borehole which depends on a number of factors. A key factor is the ease by which gas can escape from the surface of the site. For a site with cover in the form of low permeability paving or concrete, it would be expected that a borehole would have a much greater area of influence than if the site had soft landscaping.

To be conservative, it is proposed to adopt an area of influence of 20 m²(radius of 2.5m)[2], which would give:

· Trigger value of 10 L m^-2 per day x 20 m² = 200 L per day emitted from the borehole.

The criterion for “safe” flow rate from a free venting borehole becomes:

· Flow rate of methane (in terms of litre per day) < 200 L per day; or

· (Gas flow rate in terms of litre per day) x (concentration of methane in gas (in % gas)) < 200 L per day.

Scenario 2

If the rate of methane emission frequently exceeds the trigger value or shows a rising trend such that future emission rates are likely to exceed the trigger value, then any buildings to be constructed on that part of the site will require some form of gas protection measures, that is,

· (Gas flow rate in terms of litre per day) x (concentration of methane in gas (in % gas)) > 200 L per day.

The type of gas protection measures would be dependent on the design and use of the particular building. A possible measure is the incorporation of a low gas permeability membrane in the floor slab of the building or mechanical ventilation of ‘at risk’ rooms. Further investigation may be required to determine the area of land which is affected by gas emissions. The analysis and assessment of the results and design of any gas protection measures should be undertaken by suitably qualified and experienced professionals who are familiar with the properties of biogas and building protection design measures.

Scenario 3

If there are occasional exceedances of the trigger value for methane emission rate from a borehole or if there is a significant fluctuation of the monitoring results with some readings coming close to the trigger value, then any trends in the results will need to be assessed to determine their significance and the need for any building protection measures. It may be necessary to undertake further monitoring by extending the monitoring period, for example, if a spuriously high reading is noted towards the end of the monitoring period or if it seems likely that future emission rates may exceed the trigger value. The analysis and assessment of the monitoring results and design of any gas protection measures should be undertaken by suitably qualified and experienced professionals who are familiar with the properties of biogas and building protection design measures.

Scenario 4

If the rate of methane emission from any borehole frequently exceeds the upper UK guidance value of 432 L m^-2 per day (that is, Carpenter’s guidance level at which it is recommended that development should not take place), or shows a rising trend such that future emission rates are likely to exceed this value, then no buildings should be constructed on that part of the site. That is when:

· Upper UK guidance value of 432 L m^-2 per day x 20 m² = 8,640 L per day emitted from the borehole; or

· (Gas flow rate in terms of litre per day) x (concentration of methane in gas (in % gas)) > 8,640 L per day.

Depending on the monitoring results, it may be necessary to incorporate a number of gas protection measures into the design of the proposed development. Specific details cannot be provided until the results of the monitoring are available, and the building detailed designs are known and confirmed. A combination of different measures may be used for protecting both the ground level and underground structures at the development against possible risks due to biogas emissions. Discussions would need to be held with the developer and architects to determine the protection measures which are the most appropriate and feasible. At this stage, discussions with the architect have identified feasible gas protection measures that may be adopted to prevent the ingress and/or accumulation of any methane gas emissions generated from the reclamation. These gas protection measures are described below and would apply to both the Full and Minimized Reclamation options.

The following gas protection measures are recommended to be incorporated into the design of the development. A combination of different measures may be used for protecting both the ground level and underground structures at the development against possible risks due to biogas emissionsProtection of Above Ground Structures

5.5.3 Passive sub-floor ventilation may be incorporated in the building design for those buildings with no underground basement or rooms. Passive control measures for buildings to prevent gas build-up involve the creation of a clear void beneath the structure allowing natural air movements such that any emissions of gas from the ground are mixed and diluted by air.

Measures to Prevent Ingress of Gas into ‘At Risk’ Rooms

5.5.4 To prevent the ingress of methane gas into a building, a low gas permeability membrane may be incorporated in the design of the floor and any below ground walls of identified ‘at risk’ rooms (e.g. rooms housing electrical equipment, pumps or switchgear). In addition, measures should be taken to avoid or seal any openings in the floor (e.g. at services entry points). Such techniques are commonly used where there is a risk of landfill gas entering a building and have been employed on a number of developments in Hong Kong.

5.5.5 There are various proprietary products available in the market and the specific details of their application will depend on the detailed design of the ‘at risk’ rooms. Possible measures include gas-resistant polymeric membranes which can be incorporated into the floor or wall construction as a continuous sealed layer. Membranes should be able to demonstrate low gas permeability and resistance to possible chemical attack. Other building materials such as dense well-compacted concrete or steel shuttering also enhance resistance to gas permeation. In all cases, extreme care is needed during the installation of the membrane and subsequent construction works to avoid damage to the membrane.

Ventilation within ‘At Risk’ Rooms

5.5.6 As an additional measure for the protection of specific ‘at risk’ rooms, mechanical ventilation may be provided to ensure that if any gas enters the room it is dispersed and cannot accumulate to potentially dangerous concentrations. For particularly sensitive rooms, such as below ground confined spaces which contain sources of ignition, forced ventilation may be used in addition to the use of a low gas permeability membrane.

5.5.7 Three basement carparks are proposed at the Yau Tong Bay development which would be susceptible to ingress and accumulation of any biogas emissions from the reclamation. The ventilation systems for the basement carparks will be designed to ensure that the car park air quality guidelines given in ProPECC PN 2/96 Control of Air Pollution in Car Parks are achieved. Several ventilation systems would be installed and evenly distributed within the basement carpark to prevent breakdown of the entire exhaust system in the event of equipment failure. To cater for the situation of power failure, it is recommended that a back-up power supply be provided so that certain designated exhaust systems would still operate.

Protection of Utilities or Below Ground Services

5.5.8 Below ground ducts or trenches for the installation of utilities or services (e.g. telecommunications, gas, water, electricity supply or drainage connections) would be particularly prone to the ingress and accumulation of any biogas emissions. It is therefore important to prevent such ducts and trenches acting as routes by which gas may enter buildings by avoiding, as far as possible, the penetration of floor slabs by such services. In addition, any unavoidable penetrations should be carefully sealed using puddle flanges, low permeability sealant and/or membrane.

Precautions During Construction Works

5.5.9 Special care must be taken during the first two years of construction activities on the reclamation. Sub-surface excavations into the mud layers might encounter gas occasionally, but not at levels likely to be dangerous provided that the gas vents freely to atmosphere. Emission rates are unlikely to be sufficient to sustain a flame. These gas bubbles will only occur for short periods, and therefore, as a precaution, smoking and naked flames in the vicinity of drilling activities and excavations of 1m depth or more should be prohibited.

5.5.10 Precautions may be required to ensure that there is no risk due to the accumulation of gas within any temporary structures, such as site offices, during construction works on the reclamation area. It may be necessary, for example, to raise such structures slightly off the ground so that any gas emitted from the ground beneath the structure may disperse to atmosphere rather than entering the structure. A minimum clear separation distance of 500mm, as measured from the highest point on the ground surface to the underside of the lowest floor joist, is recommended in the Landfill Gas Hazard Assessment Guidance Note, EPD (1997).

Precautions Prior to Entry of Below Ground Services

5.5.11 Following construction, accumulation of gas within any below ground services can pose a risk to the staff of the utility companies. As a good working practice, prior to entry into any confined space within the reclamation site (such as manholes, underground culverts and utility casings), the gas atmosphere within the confined space should be monitored for oxygen, methane and carbon dioxide. Personnel should be made aware of the potential dangers and advised to take appropriate precautions.

5.5.12 The working practices should follow the Landfill Gas Hazard Assessment Guidance Note, EPD (1997) guidelines as follows:

· Any chamber, manhole or culvert which is large enough to permit access to personnel should be subject to entry safety procedures. Such work in confined spaces is controlled by the Factories and Industrial Undertakings (Confined Spaces) Regulations of the Factories and Industrial Undertakings Ordinance. Following the Safety Guide to Working in Confined Spaces ensures compliance with the above regulations.

· The entry or access point should be clearly marked with a warning notice (in English and Chinese) which states that there is the possibility of flammable and asphyxiating gases accumulated within.

· The warning notice should also give the telephone number of an appropriate competent person who can advise on the safety precautions to be followed before entry and during occupation of the manhole.

· Personnel should be made aware of the dangers of entering confined spaces potentially containing hazardous gases and, where appropriate, should be trained in the use of gas detection equipment.

· Prior to entry, the atmosphere within the chamber should be checked for oxygen, methane and carbon dioxide concentrations. The chamber may then only be entered if oxygen is greater than 18% by volume, methane is less than 10% of the Lower Explosive Limit (LEL), which is equivalent to 0.5% by volume (approximately), and carbon dioxide is less than 0.5% by volume.

· If either carbon dioxide or methane are higher, or oxygen lower, than the values given above, then entry to the chamber should be prohibited and expert advice sought.

· Even if conditions are safe for entry, no worker should be permitted to enter the chamber without having another worker present at the surface. The worker who enters the chamber should wear an appropriate safety/recovery harness and, preferably, should carry a portable methane, carbon dioxide and oxygen meter.

5.5.13 In general, when work is being undertaken in confined spaces sufficient approved resuscitation equipment, breathing apparatus and safety torches should be available. Persons involved in or supervising such work should be trained and practised in the use of such equipment. A permit-to-work system for entry into confined spaces should be developed by an appropriately qualified person and consistently employed.

5.5.14 The implementation schedule for biogas risk is given in Appendix E.

6. Land Contamination

6.1 Land Contamination Impact Assessment

6.1.1 Land contamination impact assessment conducted for the marine lots confirmed that the site had been contaminated by heavy metals and petroleum hydrocarbons due to past industrial operations. A Remediation Action Plan (RAP) has been prepared which specified soil remediation measures required to be carried out prior to further development of the site. The RAP is contained in Section 7 of the EIA report which shall be referred. Bio-piling, solidification and excavation for disposal are the three soil treatment method proposed in the RAP together with the corresponding monitoring requirements. The project proponent shall ensure that these remediation measures as well as the monitoring requirements as specified in the RAP are followed.

7. LANDSCAPE AND VISUAL IMPACT

7.1 Introduction

7.1.1 The EIA Report has recommended mitigation measures to minimize the landscape and visual impact due to the proposed reclamation of Yau Tong Bay. The following is a summary of the recommended measures.

7.2 Detailed Design Stage

7.2.1 The proponent shall be responsible for the implementation of the following recommended measures to enhance the landscape and visual quality of the reclamation work:-

· Incorporate of landscape input to the design of the seawall in advance to improve the interface between land and sea and maximize the recreational use of the promenade.

· Careful design of the seawall and site formation works to minimize the restriction on the design of planting and building structure for the promenade e.g. pavilion and tree pits along the seawall.

· Sloped seawall to be formed facing Victoria Harbour to create a move natural waterfront

7.3 Construction Phase

7.3.1 The Contractor shall be responsible for the implementation of the following recommended mitigation measures during the Construction Phase:-

· Provide good site management and to properly organize the construction activities on site

· Erection and maintenance of decorative screen/hoarding around the site

· Minimize the height of the temporary buildings

· Control of night time lighting

· Preservation and protection of existing mature trees of high amenity value

· Transplanting of existing mature trees if necessary

7.4 Operational Phase

7.4.1 The Contractor shall be responsible for the implementation of the following recommended mitigation measures during the Operational Phase:-

· Provide hydro-seeding in and around the development

7.4.2 The implementation schedule for landscape and visual impact risk is given in Appendix G.

8. SITE ENVIRONMENTAL AUDIT

8.1 Site Inspections

8.1.1 Site inspections provide a direct means to initiate and enforce specified environmental protection and pollution control measures. These shall be undertaken routinely to inspect construction activities in order to ensure that appropriate environmental protection and pollution control mitigation measures are properly implemented. The site inspection is one of the most effective tools to enforce the environmental protection requirements at the works area.

8.1.2 The ET Leader shall be responsible for formulating the environmental site inspection, the deficiency and action reporting system, and for carrying out the site inspection works. Within 21 days of the construction contract commencement he shall submit a proposal for site inspection and deficiency and action reporting procedures to the Contractor for agreement, and to the ER for approval. The ET’s proposal for rectification would be made known to the IC(E).

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

(i) EIA recommendations on environmental protection and pollution control mitigation measures;

(ii) works progress and programme;

(iii) individual works methodology proposals (which shall include proposal on associated pollution control measures);

(iv) contract specifications on environmental protection;

(v) relevant environmental protection and pollution control laws; and

(vi) previous site inspection results.

8.1.4 The Contractor shall keep the ET Leader updated with all relevant information on the construction contract necessary for him to carry out the site inspections. Inspection results and associated recommendations for improvements to the environmental protection and pollution control works shall be submitted to the IC(E) and the Contractor within 24 hours. The Contractor shall follow the procedures and time-frame as stipulated in the environmental site inspection, and the deficiency and action reporting system formulated by the ET Leader, to report on any remedial measures subsequent to the site inspections.

8.1.5 Ad hoc site inspections shall also be carried out if significant environmental problems are identified. Inspections may also be required subsequent to receipt of an environmental complaint, or as part of the investigation work, as specified in the Action Plan for environmental monitoring and audit.

8.2 Compliance with Legal and Contractual Requirements.

8.2.1 There are contractual environmental protection and pollution control requirements as well as environmental protection and pollution control laws in Hong Kong with which construction activities must comply.

8.2.2 In order that the works are in compliance with the contractual requirements, all works method statements submitted by the Contractor to the ER for approval shall be sent to the ET Leader for vetting to see whether sufficient environmental protection and pollution control measures have been included. The implementation schedule of mitigation measures is summarised in Appendices B, C, D, E, F and G.

8.2.3 The ET Leader shall also review the progress and programme of the works to check that relevant environmental laws have not been violated, and that any foreseeable potential for violating laws can be prevented.

8.2.4 The Contractor shall regularly copy relevant documents to the ET Leader so that work checking can be carried out. The document shall at least include the updated Work Progress Reports, updated Works Programme, any application letters for different licence/permits under the environmental protection laws, and copies of all valid licences/permits. The site diary shall also be available for the ET Leader's inspection upon his request.

8.2.5 After reviewing the document, the ET Leader shall advise the IC(E) and Contractor of any non-compliance with contractual and legislative requirements on environmental protection and pollution control for them to take follow-up actions. If the ET Leader's review concludes that the current status on licence/ permit application and any environmental protection and pollution control preparation works may result in potential violation of environmental protection and pollution control requirements, he shall also advise the Contractor and the ER accordingly.

8.2.6 Upon receipt of the advice, the Contractor shall undertake immediate action to correct the situation. The ER shall follow up to ensure that appropriate action has been taken in order to satisfy contractual and legal requirements.

8.3 Environmental Complaints

8.3.1 Complaints shall be referred to the ET Leader for action. The ET Leader shall undertake the following procedures upon receipt of any complaint:

(i) log complaint and date of receipt onto the complaint database and inform the IC(E) immediately;

(ii) investigate the complaint to determine its validity, and assess whether the source of the problem is due to works activities;

(iii) identify mitigation measures in consultation with the IC(E) if a complaint is valid and due to works;

(iv) advise the Contractor if mitigation measures are required;

(v) review the Contractor's response to identified mitigation measures, and the updated situation;

(vi) if the complaint is transferred from EPD, submit interim report to EPD on status of the complaint investigation and follow-up action within the time frame assigned by EPD;

(vii) undertake additional monitoring and audit to verify the situation if necessary, and review that circumstances leading to the complaint do not recur;

(viii) report investigation results and subsequent actions to complainant (if the source of complaint is EPD, the results should be reported within the timeframe assigned by EPD); and

(ix) record the complaint, investigation, the subsequent actions and the results in the monthly EM&A reports.

8.3.2 The complaints handling procedure is shown in Table 8.1. During any complaint investigation work, the Contractor and ER shall co-operate with the ET Leader in providing all necessary information and assistance for completion of the investigation. If mitigation measures are identified as being required in the investigation, the Contractor shall promptly carry out the mitigation. The ER shall ensure that all necessary measures have been carried out by the Contractor.

Table 8.1 Procedures in the Event of a Complaint

Step	Action	Responsible Party
Step	Action	ET	ER	Contractor	IC(E)
1	The party who receives the complaint shall notify other parties on the same day: · ET notifies ER and the Contractor; or · The Contractor notifies ET and ER; or · ER notifies ET and the Contractor.	Ö	Ö	Ö
2	Check workers and sub-contractor’s working methods and remind them of their contractual obligations.			Ö
3	If complaint is related to noise or dust, ER may instruct ET to increase monitoring frequency and to verify the validity of the complaint. ET notifies ER and the Contractor of the monitoring results.	Ö	Ö
4	Discuss with the Contractor about the complaint and remedial measures within one day when feasible.	Ö	Ö
5	Implement remedial measures on the same day if feasible.			Ö
6	If complaint is related to noise or dust, ER may instruct ET to increase monitoring frequency to assess the efficacy of the remedial actions. Notify the Contractor of the monitoring results.	Ö	Ö
7	May increase site audit frequency to access efficacy of remedial measures. Inform the Contractor of the effect of the remedial measures.				Ö
8	Party who received the complaint shall inform the complainant of the actions taken.	Ö	Ö	Ö

9. REPORTING

9.1 General

9.1.1 Reports can be provided in an electronic medium upon agreeing the format with the ER and EPD. This would enable a transition from a paper/historic and reactive approach to an electronic/real time proactive approach. All the monitoring data (baseline and impact) shall also be submitted in diskettes. The format for water quality monitoring data to be submitted in diskette is shown in Appendix I.

9.1.2 Types of reports that the ET Leader shall prepare and submit include baseline monitoring report, monthly EM&A report, quarterly EM&A summary report and annual/final EM&A review report. In accordance with Annex 21 of the TM on Environmental Impact Assessment Process, a copy of the monthly, quarterly summary and annual/final review EM&A reports shall be made available to the DAFC.

9.2 Baseline Monitoring Report

9.2.1 The ET Leader shall prepare and submit a Baseline Environmental Monitoring Report within 10 working days of completion of the baseline monitoring. Copies of the Baseline Environmental Monitoring Report shall be submitted to the Contractor, the IC(E), the ER and EPD. The ET Leader shall liaise with the relevant parties on the exact number of copies they require. The report format and baseline monitoring data format shall be agreed with EPD prior to submission.

9.2.2 The baseline monitoring report shall include at least the following:

(i) up to half a page executive summary;

(ii) brief project background information;

(iii) drawings showing locations of the baseline monitoring stations;

(iv) monitoring results (in both hard and diskette copies) together with the following information:

· monitoring methodology;

· name of laboratory and types of equipment used and calibration details;

· parameters monitored;

· monitoring locations (and depth where applicable);

· monitoring date, time, frequency and duration; and

· QA/QC results and detection limits.

(v) details of influencing factors, including:

· major activities, if any, being carried out on the site during the period;

· weather conditions during the period; and

· other factors which might affect results;

(vi) determination of the Action and Limit Levels for each monitoring parameter and statistical analysis of the baseline data, the analysis shall conclude if there is any significant difference between control and impact stations for the parameters monitored;

(vii) revisions for inclusion in the EM&A Manual; and

(viii) comments, recommendations and conclusions.

9.3 Monthly EM&A Reports

9.3.1 The results and findings of all EM&A work required in the Manual shall be recorded in the monthly EM&A reports prepared by the ET Leader. The EM&A report shall be prepared and submitted within 10 working days of the end of each reporting month, with the first report due the month after construction commences. Each monthly EM&A report shall be submitted to the following parties: the Contractor, the IC(E), the ER and the EPD. Before submission of the first EM&A report, the ET Leader shall liaise with the parties on the required number of copies and format of the monthly reports in both hard copy and electronic medium.

9.3.2 The ET leader shall review the number and location of monitoring stations and parameters every six months, or on as needed basis, in order to cater for any changes in the surrounding environment and the nature of works in progress.

First Monthly EM&A Report

9.3.3 The first monthly EM&A report shall include at least the following :

(i) executive summary (1-2 pages):

· breaches of Action and Limit levels;

· complaint Log;

· notifications of any summons and successful prosecutions;

· reporting Changes; and

· future key issues.

(ii) basic project information:

· project organisation including key personnel contact names and telephone numbers;

· programme;

· management structure, and

· work undertaken during the month;

(iii) environmental status:

· works undertaken during the month with illustrations (such as location of works, daily dredging/filling rates, percentage fines in the fill material used); and

· drawing showing the project area, any environmental sensitive receivers and the locations of the monitoring and control stations (with co-ordinates of the monitoring locations).

(iv) a brief summary of EM&A requirements including:

· all monitoring parameters;

· environmental quality performance limits (Action and Limit levels);

· Event-Action Plans;

· environmental mitigation measures, as recommended in the project EIA study final report; and

· environmental requirements in contract documents;

(v) implementation status:

· advice on the implementation status of environmental protection and pollution control/mitigation measures, as recommended in the project EIA study;

(vi) monitoring results (in both hard and diskette copies) together with the following information;

· monitoring methodology;

· name of laboratory and types of equipment used and calibration details;

· parameters monitored;

· monitoring locations (and depth);

· monitoring date, time, frequency, and duration;

· weather conditions during the period;

· any other factors which might affect the monitoring results; and

· QA/QC results and detection limits.

(vii) report on non-compliance, complaints, notifications of summons and successful prosecutions:

· record of all non-compliance (exceedances) of the environmental quality performance limits (Action and Limit levels);

· record of all complaints received (written or verbal) for each media, including locations and nature of complaints investigation, liaison and consultation undertaken, actions and follow-up procedures taken, results and summary;

· record of all 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;

· review of the reasons for and the implications of non-compliance, complaints, summons and prosecutions including review of pollution sources and working procedures; and

· description of the actions taken in the event of non-compliance and deficiency reporting and any follow-up procedures related to earlier non-compliance.

(viii) Others

· an account of the future key issues as reviewed from the works programme and work method statements;

· advice on the solid and liquid waste management status; and

· comments (e.g. effectiveness and efficiency of the mitigation measures), recommendations (e.g. any improvement in the EM&A programme) and conclusions.

Subsequent EM&A Reports

9.3.4 Subsequent monthly EM&A reports shall include the following :

(i) executive summary (1-2 pages):

· breaches of Action and Limit levels;

· complaints log;

· notifications of any summons and successful prosecutions;

· reporting changes; and

· future key issues.

(ii) basic project information:

· project organisation including key personnel contact names and telephone numbers;

· programme;

· management structure, and

· work undertaken during the month;

(iii) environmental status:

· works undertaken during the month with illustrations (such as location of works, daily dredging/filling rates, percentage fines in the fill material used); and

· drawing showing the project area, any environmental sensitive receivers and the locations of the monitoring and control stations.

(iv) implementation status:

· advice on the implementation status of environmental protection and pollution control/mitigation measures, as recommended in the project EIA study;

(v) monitoring results (in both hard and diskette copies) together with the following information;

· monitoring methodology;

· name of laboratory and types of equipment used and calibration details;

· parameters monitored;

· monitoring locations (and depth);

· monitoring date, time, frequency, and duration;

· weather conditions during the period;

· any other factors which might affect the monitoring results; and

· QA/QC results and detection limits.

(vi) report on non-compliance, complaints, notifications of summons and successful prosecutions:

· record of all non-compliance (exceedances) of the environmental quality performance limits (Action and Limit levels);

· review of the reasons for and the implications of non-compliance, complaints, summons and prosecutions including review of pollution sources and working procedures; and

· description of the actions taken in the event of non-compliance and deficiency reporting and any follow-up procedures related to earlier non-compliance.

(vii) others

· an account of the future key issues as reviewed from the works programme and work method statements;

· advice on the solid and liquid waste management status; and

· comments (e.g. effectiveness and efficiency of the mitigation measures), recommendations (e.g. any improvement in the EM&A programme) and conclusions.

(viii) appendix

· Action and Limit levels;

· graphical plots of trends of monitored parameters at key stations over the past four reporting periods for representative monitoring stations annotated against the following:

a) major activities being carried out on site during the period;

b) weather conditions during the period; and

c) any other factors which might affect the monitoring results.

· monitoring schedule for the present and next reporting period;

· cumulative statistics on complaints, notifications of summons and successful prosecutions; and

· outstanding issues and deficiencies.

9.4 Quarterly EM&A Summary Reports

9.4.1 A quarterly EM&A summary report of around 5 pages shall be produced and shall contain at least the following information:

(i) executive summary (1-2 pages);

(ii) basic project information including a synopsis of the project organisation, programme, contacts of key management, and a synopsis of work undertaken during the quarter;

(iii) a brief summary of EM&A requirements including:

· monitoring parameters;

· environmental quality performance limits (Action and Limit levels); and

· environmental mitigation measures, as recommended in the project EIA study final report;

(iv) advice on the implementation status of environmental protection and pollution control/ mitigation measures, as recommended in the project EIA study report, summarised in the updated implementation schedule;

(v) drawings showing the project area, any environmental sensitive receivers and the locations of the monitoring and control stations;

(vi) graphical plots of any trends in monitored parameters over the past 4 months (the last month of the previous quarter and the present quarter) for representative monitoring stations annotated against;

· the major activities being carried out on site during the period;

· weather conditions during the period; and

· any other factors which might affect the monitoring results;

(vii) advice on the solid and liquid waste management status;

(viii) a summary of non-compliance (exceedances) of the environmental quality performance limits (Action and Limit levels);

(ix) a brief review of the reasons for and the implications of any non-compliances, including a review of pollution sources and working procedures;

(x) a summary description of actions taken in the event of non-compliance and any follow-up procedures related to any earlier non-compliances;

(xi) a summarized record of all complaints received (written or verbal) for each media, liaison and consultation undertaken, actions and follow-up procedures taken;

(xii) comments (e.g. a review of the effectiveness and efficiency of the mitigation measures and the performance of the environmental management system i.e. of the overall EM&A programme); recommendations (e.g. any improvement in the EM&A programme) and conclusions for the quarter; and

(xiii) proponents' contacts and any hotline telephone number for the public to make enquiries.

9.5 Annual/Final EM&A Review Reports

9.5.1 The annual/final EM&A report should contain at least the following information:

(i) executive summary (1-2 pages);

(ii) drawings showing the project area, any environmental sensitive receivers and the locations of the monitoring and control stations;

(iii) basic project information including a synopsis of the project organization, contacts of key management, and a synopsis of work undertaken during the course of the project or past twelve months;

(iv) a brief summary of EM&A requirements including:

· environmental mitigation measures, as recommended in the project EIA study final report;

· environmental impact hypotheses tested;

· environmental quality performance limits (Action and Limit levels);

· all monitoring parameters;

· Event-Action Plans.

(v) a summary of the implementation status of environmental protection and pollution control/mitigation measures, as recommended in the project EIA study report, summarised in the updated implementation schedule;

(vi) graphical plots and the statistical analysis of the trends of monitored parameters over the course of the project, including the post-project monitoring (or the past twelve months for annual reports) for all monitoring stations annotated against;

· the major activities being carried out on site during the period;

· weather conditions during the period; and

· any other factors which might affect the monitoring results;

(vii) a summary of non-compliance (exceedances) of the environmental quality performance limits (Action and Limit levels);

(viii) a review of the reasons for and the implications of non-compliance including review of pollution sources and working procedures as appropriate;

(ix) a description of the actions taken in the event of non-compliance;

(x) a summary record of all complaints received (written or verbal) for each media, liaison and consultation undertaken, actions and follow-up procedures taken;

(xi) a 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;

(xii) a review of the validity of EIA predictions and identification of shortcomings in EIA recommendations; and

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

(xiv) recommendations and conclusions (e.g. a review of success of the overall EM&A programme to cost-effectively identify deterioration and to initiate prompt effective mitigatory action when necessary).

9.6 Data Keeping

9.6.1 No site based documents (such as monitoring field records, laboratory analysis records, site inspection forms, etc.) are required to be included in the monthly EM&A reports. However, any such document shall be well kept by the ET Leader and be ready for inspection upon request. All relevant information shall be clearly and systematically recorded in the document. Monitoring data shall also be recorded in magnetic media form, and the software copy must be available upon request. Data format shall be agreed with EPD. All documents and data shall be kept for at least one year following completion of the construction contract.

9.7 Interim Notifications of Environmental Quality Limit Exceedances

9.7.1 With reference to the Event and Action Plan, when the environmental quality performance limits are exceeded, the ET Leader shall immediately notify the IC(E) and EPD, as appropriate. The notification shall be followed up with advice to IC(E) and EPD on the results of the investigation, proposed actions and success of the actions taken, with any necessary follow-up proposals. A sample template for the interim notifications is presented in Appendix J.

EIA Ref ^#	EM&A Log Ref	Environmental Protection Measures/Mitigation Measures	Location/ Timing	Implementation Agent	Implementation Stages*	Relevant Legislation and Guidelines
Sec 3.7	Sec 2.3	· Use of quiet equipment · Erect a 3m tall noise barrier along the site boundary	Work site/ Throughout the phases of the reclamation works	Contractor		ü			NCO
Sec 3.7	Sec 2.3	· Use of acoustic barriers as close to the source as possible. Equipment to be shielded: compressor, water pump, concrete pump, generator, various hand tools, saw, excavator, loader, truck mixer, mobile crane, vibrator and breaker.	Proposed school (RSCH2) to the east of the site/ During examination periods	Contractor		ü			NCO

Appendix C Implementation Schedule for Water Quality Control

EIA Ref^#	EM&A Log Ref	Environmental Protection Measures/Mitigation Measures	Location/ Timing	Implementation Agent	Implementation Stages*				Relevant Legislation and Guidelines
EIA Ref^#	EM&A Log Ref	Environmental Protection Measures/Mitigation Measures	Location/ Timing	Implementation Agent	Des	C	O	Dec	Relevant Legislation and Guidelines
Sec 4.8	Sec 3.9	Implementation of the following measure to avoid the accumulation of the pollutants within the embayed water during construction: Construct a temporary channel / culvert to divert the existing culvert outfalls out of the YTB before the commencement of marine works.	Marine works site / Prior to commencement of marine works	Project proponent and contractor	ü	ü
Sec 4.8	Sec 3.9	Implementation of following measures for dredging and filling works during seawall construction and dredging works during construction of stormwater box culvert: · Use closed grab dredgers for mud dredging for seawall foundation; · Place silt curtain around close grab dredgers during dredging and back filling of seawall foundation; · Maximum daily production rate shall not exceed 1550 m³day^-1 for dredging and 2200 m³day^-1 for sand filling; · Design and provision of a single layer of silt screens across (typically made of synthetic geotxtile fabrics) the saltwater intakes at the Dairy Farm Ice Factory, the WSD’s Cha Kwo Ling and Yau Tong saltwater pumping stations; and · Inspection and maintenance of the silt screens and curtains.	Marine works site and at the identified water sensitive receivers / During seawall construction	Project proponent and contractor	ü	ü
Sec 4.8	Sec 3.9	Implementation of following measures for dredging and filling works during Phase 1 and Phase 2 reclamations: · Sand filling (by bottom dumping) in Phase 1 and Phase 2 reclamations should commence after the completion of seawall construction; · Place a single layer of silt curtain (made from impervious material such as coated nylon) across the seawall openings before sand filling by bottom dumping in the Phase 1 and Phase 2 reclamations; · Maximum daily production rate shall not exceed 10,000 m³day^-1 for sand filling in Phase 1; · Maximum daily production rate shall not exceed 6,000 m³day^-1 for sand filling in Phase 2; · Design and provision of double layers of silt screens (typically made of synthetic geotextile fabrics) across the saltwater intakes at the Dairy Farm Ice Factory, the WSD’s Cha Kwo Ling and Yau Tong saltwater pumping stations; · Inspection and maintenance of the silt screens and curtains through visual inspection and review of marine water quality at the intakes; and · If the monitoring results indicate continuous non-conformance, the contractor should propose additional mitigation measures.	Marine works site and at the identified water sensitive receivers / During Phase 1 and Phase 2 reclamations	Project proponent and contractor	ü	ü
Sec 4.8	Sec 3.9	Implementation of following measures for dredging and filling works during Phase 3 construction of proposed concrete decking near the mouth of YTB: · Provision of double layers of silt screens (typically made from synthetic geotextile fabrics) across the saltwater intakes at the Dairy Farm Ice Factory, the WSD’s Cha Kwo Ling and Yau Tong saltwater pumping stations. · Inspection and maintenance of the silt screens through visual inspection and review of marine water quality at the intakes; and · If monitoring results indicate continuous non-conformance, the contractor should propose additional mitigation measures.	Marine works site and at the identified water sensitive receivers / During Phase 3 construction	Project proponent and contractor	ü	ü
Sec 4.8	Sec 3.9	Design consideration for the future potential Reprovisioned Cha Kwo Ling (CKL) Saltwater Intake: · If WSD intent to relocate the existing CKL Saltwater Pumping Station, the saltwater intake of the potential reprovisioned CKLSWPS should be located at below -2.0 mPD to avoid abstracting the surface sewage plume from the Yau Tong Sewage Pumping Station emergency outfall at Ko Fai Road; and · Optimal intake configuration should be reviewed and decided in the detailed design stage for the reprovisioning of the CKLSWPS.	Cha Kwo Ling Saltwater Intake / During detailed design stage	Not known at this stage	ü
Sec 4.8	Sec 3.9	Mitigation measures for the existing Cha Kwo Ling Saltwater Intake during the operation phase of the Project: · To avoid accumulation of floating debris at water below the decked promenade near the intake of existing CKLSPS, floating booms shall be deployed near the intake and any floating debris detained by the floating booms should be collected and removed regularly. Air slots should be included in the detailed design of the decked promenade to enhance the air flow below.	Cha Kwo Ling Saltwater Intake / During operation phase (for floating booms) and during detailed design stage (for air slots)	Project proponent and contractor	ü		ü
Sec 4.8	Sec 3.9	Implementation of following pollution avoidance measures for dredging and dumping: · Mechanical grabs shall be designed and maintained to avoid spillage and shall seal tightly while being lifted (closed-grab clamshell dredgers); · All vessels shall be sized such that adequate clearance is maintained between vessels and the sea bed at all states of the tide to ensure that undue turbidity is not generated by turbulence from vessel movement or propeller wash; · All pipe leakages shall be repaired promptly and plant shall not be operated with leaking pipes; · Excess material shall be cleaned from the decks and exposed fittings of barges before the vessel is moved; · Adequate freeboard shall be maintained on barges to ensure that decks are not washed by wave action; · All barges shall be fitted with tight fitting seals to their bottom openings to prevent leakage of material; · Loading of barges shall be controlled to prevent splashing of dredged material to the surrounding water, and · Barges shall not be filled to a level which will cause the overflow of materials or polluted water during loading or transportation.	Marine works site, disposal ground and during transportation / During dredging and dumping activities	Contractor		ü
Sec 4.8	Sec 3.9	Implementation of the following special EPD procedures for avoidance of pollution for handling of contaminated mud: · The locations and depths of areas of contaminated marine sediments shall be indicated in the construction contract. (The stipulation of the sediment contamination details shall be conducted during preparation of the tender documents and is the responsibility of the project proponent or its agent); · Contaminated marine sediments shall be dredged, transported and placed in approved special dumping grounds in accordance with the EPD Technical Circular No. 1-1-92, Works Branch Technical Circular (WBTC) No. 22/92 and WBTC No. 6/92. · Contaminated mud shall be placed at a location and in such a manner as directed by the Management Team of CED; · All dumping operations shall be carried out in strict accordance with the method statement agreed by the DEP; · Employ a grab dredger with a closed watertight grab for dredging of contaminated marine mud; · Transport designated contaminated marine mud by split barge of not less than 750m³ capacity, well maintained and capable of rapid opening and discharge at the disposal site; · Design properly and maintain carefully all operational plant so as to minimize the risk of sediments or other pollutants being released into the water column and deposited in the seabed other than designated locations; · Fit all barges with tight fitting seals to their bottom openings to prevent leakage of material; · Release the mud rapidly and close the hoppers immediately; any material adhering to the sides of the hopper shall not be washed out of the hopper and the hopper shall remain closed until the barge next returns to the disposal site. The dumping vessel shall be stationary throughout the dumping operation;	Marine works site, disposal ground and during transportation / Dredging, transportation and disposal of contaminated sediment	Contractor		ü			EPD Technical Circular No. 1-1-92 Works Branch Technical Circular (WBTC) No. 22/92 and WBTC No. 6/92
		· Size all vessels such that adequate clearance is maintained between the seabed and vessels at all states of the tide, to ensure that undue turbidity is not generated by turbulence from vessel movement or propeller wash. Adequate freeboard shall be maintained on barges to ensure that decks are not washed by wave action;
		· Employ only barges equipped with automatic self-monitoring devices for the dumping operation, and shall co-operate with and facilitate the DEP to inspect the device and retrieve the record stored in the device on a regular basis;
		· Provide experienced full time personnel on board all dumping vessels and provide suitable training to ensure that appropriate methods to minimize pollution are implemented. Records shall be maintained to satisfy the DEP that there is no short dumping or dumping outside the designated Dumping Area. The Contractor shall also make available to the DEP and the secretary of Fill Management Committee (S/FMC), CED, at any time upon the written request of the DEP, all information and records relevant to the dredging and mud disposal operation. This information shall include, but not be limited to, all data on the plant used by the Contractor, up-to-date periodic data on production rates and record copies of Notification of Dumping which have been sent to the Management Team, etc.
Sec 4.8	Sec 3.9	Establish communication procedure between WSD and DSD for dealing with the event of potential emergency sewage discharge at the Yau Tong sewage pumping station. DSD should inform WSD of the details of such discharge through the emergency outfall, e.g. volume, timing and duration, in advance where possible. DSD should minimize the discharge and liaise with WSD to avoid discharge during peak operation hours of WSD’s saltwater pumping station.	During detailed design stage	Project proponent	ü
Sec 4.8	Sec 3.9	Subject to the sampling results of Contamination Assessment Plan of the site, any contaminated land treatments are subjected to EPD’s requirements on handling, treatment and disposal. Should effluent stream and/or extracted ground water be discharged from the site, the discharge shall comply with the WPCO and any EPD special requirements.	Work sites / During construction stage	Contractor		ü
Sec 9.2	Sec 3.5	EM&A program · Baseline monitoring: to establish the baseline water quality conditions. For at least 4 weeks prior to the commencement of marine works, 3 days per week, at both mid-flood and mid-ebb tides. Interval between 2 sets of monitoring shall not be less than 36 hours.	Works site and designated monitoring locations / Prior to commencement of marine works	Contractor and Environmental Team		ü
Sec 9.2	Sec 3.6	EM&A program · Impact monitoring: to monitor the nearby water quality to identify any need for additional mitigation measures or modifying methods of work if non-compliance should arise. Monitoring to be carried out during construction of reclamation, 3 days per week (except at the CKLSPS where water quality monitoring will be undertaken every day), at both mid-flood and mid-ebb tides. Interval between 2 sets of monitoring shall not be less than 36 hours. The monitoring results for CKLSPS shall be submitted to WSD on a weekly basis. · If the impact monitoring results indicate that dredging/filling works have caused an adverse impact on water quality at the monitoring stations at the salt water intakes, for instance, non-compliance with WSD WQOs, appropriate actions, including the lowering of production rates for dredging and filling or rescheduling of works to avoid the peak saltwater intake hours, should be taken and additional mitigation measures should be implemented as necessary.	Works site and designated monitoring locations / During construction period	Contractor and Environmental Team		ü
Sec 9.2	Sec 3.7	EM&A program · Post-project monitoring: Upon completion of all marine-based construction activities, a post-project monitoring exercise on water quality shall be carried out for 4 weeks in the same manner as the impact monitoring, plus monitoring of ammoniacal nitrogen and E. coli. the necessity of additional 6-month post-project water quality monitoring will be subject to the results obtained after the 4-week monitoring period at the CKLSPS intake. For other sensitive receivers, a 4-week post-project monitoring period will be adequate.	Works site and designated monitoring locations / After the completion of marine works	Contractor and Environmental Team		ü

# All recommendations and requirements resulted during the course of EIA/EA Process, including ACE and/or accepted public comment to the proposed project.

* Des - Design, C - Construction, O - Operation and Dec - Decommissioning

Appendix D Implementation Schedule for Waste Management & Mud Disposal

EIA Ref^#	EM&A Log Ref	Environmental Protection Measures/Mitigation Measures	Location/ Timing	Implementation Agent	Implementation Stages*				Relevant Legislation and Guidelines
EIA Ref^#	EM&A Log Ref	Environmental Protection Measures/Mitigation Measures	Location/ Timing	Implementation Agent	Des	C	O	Dec	Relevant Legislation and Guidelines
Sec 5.6	Sec 4.2	Transportation and disposal of dredged marine sediment · Dispose dredged sediments at designated marine disposal ground depending on level of contamination. · Bottom opening of barges shall be fitted with tight fitting seals to prevent leakage of material. Excess material shall be cleaned from the decks and exposed fittings of barges and hopper dredgers before the vessel is moved. · Loading of barges and hopper dredgers shall be controlled to prevent splashing of dredged material to the surrounding water, and barges or hoppers shall not be filled to a level which will cause the overflow of materials or polluted water during loading or transportation. · Monitoring of barge loading shall be conducted to ensure that loss of material does not take place during transportation. Transport barges or vessels shall be equipped with automatic self monitoring devices as specified by the DEP (Director of Environmental Protection).	Along transportation route and at marine disposal ground / During construction period	Contractor		ü			WBTC No. 3/2000 Management of Dredged/ Excavated Sediment
Sec 5.6	Sec 4.2	The need for any special disposal procedures for dredged contaminated sediments shall be examined in detail at the design stage of the Project, as necessary, based on the results of biological screening. The recommended special disposal methodology is the sealing of dredged contaminated sediments in geosynthetic containers in the hopper barge and to drop the geosynthetic containers with the contaminated sediment into the designated contaminated mud pit at East Sha Chau, where it would be covered by further mud disposal and later by the mud pit capping, thereby meeting the requirements for fully confined mud disposal. In the event that the biological test results show that special disposal arrangements are necessary, field trials are recommended to be undertaken during the detailed design site investigation stage (using uncontaminated mud) to establish the optimum container capacity and handling method, and to demonstrate the effectiveness of the recommended disposal method.	Work site / During design phase	Project proponent/ Contractor	ü				WBTC No. 3/2000
Sec 5.6	Sec 4.2	Good Site Practice and Waste Reduction Measures · Nominate an approved personnel, such as a site manager, to be responsible for good site practices and effective arrangements for collection and disposal to an appropriate facility of all wastes generated at the works area. Training of site personnel in proper waste management and handling procedures shall be undertaken. · Construction materials should be planned and stocked carefully to minimise and avoid unnecessary generation of waste · General refuse shall be stored and collected separately from other construction and chemical wastes. Provide on-site refuse collection facilities and enclosed transfer facility for storage and containment.. · Waste points should be provided sufficiently and waste should be collected regularly	Marine works site and along transportation route to disposal location / During construction period	Contractor		ü
Sec 5.6	Sec 4.2	· Separate chemical wastes for special handling and appropriate treatment at the Chemical Waste Treatment Facility located at Tsing Yi. Chemical waste shall be handled according to the Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes. · Regular cleaning and maintenance programme for drainage systems, sumps and oil interceptors. · Develop procedures such as a trip-ticket system to monitor the disposal of C&D material and solid wastes at public filling areas and landfills, and to control fly-tipping. · A recording system for the amount of wastes generated, recycled and disposed should be proposed.				ü			Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes
Sec 5.6	Sec 4.2	To minimize the potential impact on health and safety/contamination exposure, the following protective measures shall be followed: · No unauthorized persons shall be allowed into the works areas, and necessary precautions shall be taken to prohibit unauthorized entry to the Site or works areas. · Eating, drinking, smoking or any practice that increases the probability of hand to mouth transfer and ingestion of material are prohibited . · Food, beverages, tobacco products, etc, are prohibited in any area designated as being contaminated. Adequate warning signs shall be posted to this effect. · Hands must be thoroughly washed upon leaving the works area, and before eating, drinking or any other activities. · All field personnel shall wear protective gear such as gloves to minimize exposure to any contaminated material.	During special disposal arrangements for seriously contaminated sediment	Contractor		ü
Sec 5.6	Sec 4.2	General Site Wastes · Collection area for construction site waste should be provided where waste can be stored prior to removal from site · An enclosed and covered area for the collection of the waste is recommended to reduce ‘wind blow’ of light material · An open area used for storage or loading/unloading of wastes should be bunded and all the polluted surface run-off collected within this area should be diverted into sewers	Marine works site and along transportation route to disposal location / During construction period	Contractor		ü
Sec 5.6	Sec 4.2	Workforce Wastes · Suitable collection sites around site offices and canteen should be required · Waste should be removed daily or as often as required	Marine works site and along transportation route to disposal location / During construction period	Contractor		ü
Sec 5.6	Sec 4.2	Chemical Waste · After use, chemical waste should be handled according to the Code of Practice on the Package, Labelling and Storage of Chemical Wastes · Waste should be properly stored on site within suitably designed containers and should be collected by an approved licensed waste collectors for disposal at the Chemical Waste Treatment Centre (CWTC) or other licenced facility in accordance with the Chemical Waste (General) Regulation · Any service shop and minor maintenance facilities should be located on hard standing within a bunded area, and sumps and oil interceptors should be provided · Provision of appropriate on-site temporary storage facility for any asbestos containing materials (ACM) where necessary. Storage facilities shall be designed in accordance with the Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes. Employ registered contractors for removal of ACM off-site and disposal at a designated landfill site.	Marine works site and along transportation route to disposal location / During construction period	Contractor		ü			Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes
Sec 5.6	Sec 4.2	Construction and Demolition Material · The selective demolition method is recommended to be employed to minimize the effort of sorting mixed C&D materials. · Separate construction and demolition material into C&D waste (non-inert material) and public fill (inert material) for appropriate disposal. Public fill disposed at a public filling area shall only consist of earth, building debris, broken rock and concrete. The material shall be free from marine mud, household refuse, plastic, metals, industrial and chemical waste, animal and vegetable matter, and other unsuitable material. Small quantities of timber mixed with otherwise suitable material would be permitted. C&D waste, such as wood, glass, plastic, steel and other metals, shall be reused or recycled and, as a last resort, disposed to landfill. · A suitable area should be designated to facilitate the sorting process and a temporary stockpiling area will be required for the separated materials. Public fill should be re-used on-site in the reclamation works where possible.	Existing shipyard buildings and structures at Yau Tong Bay~~Marine works site and along transportation route to disposal location~~ / During construction period	Contractor		ü

# All recommendations and requirements resulted during the course of EIA/EA Process, including ACE and/or accepted public comment to the proposed project.

* Des - Design, C - Construction, O - Operation and Dec - Decommissioning

Appendix E Implementation Schedule for Biogas Risk

EIA Ref^#	EM&A Log Ref	Environmental Protection Measures/Mitigation Measures	Location/ Timing	Implementation Agent	Implementation Stages*				Relevant Legislation and Guidelines
EIA Ref^#	EM&A Log Ref	Environmental Protection Measures/Mitigation Measures	Location/ Timing	Implementation Agent	Des	C	O	Dec	Relevant Legislation and Guidelines
Sec 6.5	Sec 5.2 to 5.4	Gas monitoring: · Monitoring should be undertaken via purposely installed wells within boreholes drilled into the fill material. · Where possible, monitoring wells should be located in areas designated for open space. · Concentrations of methane gas should be measured by portable gas monitoring instruments. Gas flow rates and fluxes should also be measured if emission velocities are not too low. · It is recommended that monitoring be undertaken monthly for a period of at least one year prior to the commencement of construction works on the reclamation. Subject to the review of the gas monitoring results and agreement with EPD, the length of the monitoring period may be required to be extended beyond one year.	Within reclaimed area and near reclamation perimeter (approx. 20 m from existing seawalls)	Contractor and Environmental Team		ü			Landfill Gas Hazard Assessment Guidance Note, EPD (1997)
Sec 6.5	Sec 5.5	Monitoring Guidelines & Precautionary Gas Protection Measures At this stage it is difficult to formulate specific guidelines on what protection measures would be required for the measured rates of gas emission as this would depend on the detailed design of the individual buildings to be constructed and the ‘at risk’ rooms identified. The following criteria may be used as general guidelines. Scenario 1 If rates of methane emission are consistently much less than the trigger value (10 L m^-2 per day), including monitoring occasions when atmospheric pressure is falling rapidly, it is considered that the buildings will not require gas protection measures. To be conservative, it is proposed to adopt an area of influence of 20 m²(radius of 2.5m), which would give: · Trigger value of 10 L m^-2 per day x 20 m² = 200 L per day emitted from the borehole The criterion for “safe” flow rate from a free venting borehole becomes: · Flow rate of methane (in terms of litre per day) < 200 L per day; or · (Gas flow rate in terms of litre per day) x (concentration of methane in gas (in % gas)) < 200 L per day Scenario 2 If the rate of methane emission frequently exceeds the trigger value or shows a rising trend such that future emission rates are likely to exceed the trigger value, then any buildings to be constructed on that part of the site will require some form of gas protection measures, that is, · (Gas flow rate in terms of litre per day) x (concentration of methane in gas (in % gas)) > 200 L per day. The type of gas protection measures would be dependent on the design and use of the particular building. A possible measure is the incorporation of a low gas permeability membrane in the floor slab of the building. Further investigation may be required to determine the area of land that is affected by gas emissions. The analysis and assessment of the results and design of any gas protection measures should be undertaken by suitably qualified and experienced professionals who are familiar with the properties of biogas and building protection design measures. Scenario 3 If there are occasional exceedences of the trigger value for methane emission rate from a borehole or if there is significant fluctuation of the monitoring results with some readings coming close to the trigger value, then any trends in the results will need to be assessed to determine their significance and the need for any building protection measures. It may be necessary to undertake further monitoring by extending the monitoring period, for example, if a spuriously high reading is noted towards the end of the monitoring period or if it seems likely that future emission rates may exceed the trigger value. The analysis and assessment of the monitoring results and design of any gas protection measures should be undertaken by suitably qualified and experienced professionals who are familiar with the properties of biogas and building protection design measures. Scenario 4 If the rate of methane emission from any borehole frequently exceeds the upper UK guidance value of 432 L m^-2 per day (that is, Carpenter’s guidance level at which it is recommended that development should not take place), or shows a rising trend such that future emission rates are likely to exceed this value, then no buildings should be constructed on that part of the site. That is when: · Upper UK guidance value of 432 L m^-2 per day x 20 m² = 8,640 L per day emitted from the borehole; or · (Gas flow rate in terms of litre per day) x (concentration of methane in gas (in % gas)) > 8,640 L per day. Depending on the monitoring results, it may be necessary to incorporate a number of gas protection measures into the design of the proposed development. Specific details cannot be provided until the results of the monitoring are available, and the exact building design are known and confirmed. A combination of different measures may be used for protecting both the ground level and underground structures at the development against possible risks due to biogas emissions. Discussions would need to be held with the developer and architects to determine the protection measures which are the most appropriate and feasible. Typical gas protection measures that may be adopted are described below.	Within reclaimed area / Immediate post-reclamation period	Contractor and Environmental Team		ü	ü		Waste Managem-ent Paper No. 26A on Landfill Completion, UK DOE (1993)
Sec 6.5	Sec 5.5	Precautionary gas protection measures: · For buildings with no underground basement or rooms, passive sub-floor venting should be incorporated in the building design. · For identified ‘at risk’ rooms, a low gas permeability membrane may be incorporated in the design of the floor and any below ground walls. In addition, measures should be taken to avoid or seal any openings in the floor (e.g. at service entry points). · Mechanical ventilation should be provided in specific ‘at risk’ rooms. For particularly sensitive rooms, such as below ground confined spaces which contain sources of ignition, forced ventilation may be used in addition to the use of a low gas permeability membrane.	Building structures within reclamation area / During design, construction & operation phase	Project proponent/ Contractor/ Utility companies	ü	ü	ü		ProPECC PN 2/96 Control of Air Pollution in Car Parks
		· For the three proposed basement car parks, the ventilation systems should be designed to ensure that the car park air quality guidelines given in ProPECC PN 2/96 Control of Air Pollution in Car Parks are achieved. Several ventilation systems should be installed and evenly distributed within the basement carpark, and a back-up power supply should be provided for the ventilation system.
		· Penetration of floor slabs by utilities or below ground services should be avoided, as far as possible. Any unavoidable penetrations should be carefully sealed using puddle flanges, low permeability sealant and/or membrane.
Sec 6.5	Sec 5.5	Precautions during construction works: · Smoking and naked flames in the vicinity of drilling activities should be prohibited. · Temporary structures, such as site offices, should be raised slightly off the ground. A minimum clear separation distance of 500mm, as measured from highest point on the ground surface to underside of lowest floor joist, is recommended.	Reclaimed area / During construction phase	Contractor		ü			Landfill Gas Hazard Assessment Guidance Note, EPD (1997)
Sec 6.5	Sec 5.5	Precautions prior to entry of below ground services: · Prior to entry, the atmosphere within the chamber should be checked for oxygen, methane and carbon dioxide concentrations. The chamber may then only be entered if oxygen is greater than 18% by volume, methane is less than 10% of the Lower Explosive Limit (LEL), which is equivalent to 0.5% by volume (approximately), and carbon dioxide is less than 0.5% by volume. · The entry or access point of chamber, manhole or culvert which is large enough to permit access to personnel should be clearly marked with a warning notice (in English and Chinese) which states that there is the possibility of flammable and asphyxiating gases accumulated within. · The warning notice should also give the telephone number of an appropriate competent person who can advise on the safety precautions to be followed before entry and during occupation of the manhole. · Personnel should be made aware of the dangers of entering confined spaces potentially containing hazardous gases and, where appropriate, should be trained in the use of gas detection equipment. · If either carbon dioxide or methane are higher, or oxygen lower, than the values given above, then entry to the chamber should be prohibited and expert advice sought. · Even if conditions are safe for entry, no worker should be permitted to enter the chamber without having another worker present at the surface. The worker who enters the chamber should wear an appropriate safety/recovery harness and, preferably, should carry a portable methane, carbon dioxide and oxygen meter.	Reclaimed area / During construction and operation phases	Utility companies		ü	ü		Landfill Gas Hazard Assessment Guidance Note, EPD (1997)

# All recommendations and requirements resulted during the course of EIA/EA Process, including ACE and/or accepted public comment to the proposed project.

* Des - Design, C - Construction, O - Operation and Dec - Decommissioning

EIA Ref^#	Environmental Protection Measures/Mitigation Measures	Location/ Timing	Implementation Agent	Implementation Stages*	Relevant Legislation and Guidelines
· Sec 7, · Para 8 of Appendix 7C, · Para 3.5 of Appendix 7A,	· Further land contamination assessments to be carried out for inaccessible lots, as well as areas that required further sampling to ascertain contamination extent. Supplementary CAP, CAR and RAPs to be submitted to EPD for endorsement before commencement of remediation work. These reports shall detail the further sampling & remediation works required. The development construction work shall only commence after all the remediation work has been completed.	Inaccessible marine lots as described under para. 3.5 of Appendix 7A as well as areas that required further sampling to ascertain contamination extent./ Upon availability of site access Supplementary CAP, CAR and RAPs to be submitted to EPD for endorsement before commencement of the remediation work. Development construction work should only commence after all the remediation work has been completed.	Environmental consultant, Site investigation contractor, Laboratory, to be appointed by the project proponent.			Ö	· Guidance Notes for Investigation and Remediation of Contaminated Sites of Petrol Filling Stations, Boatyards, and Car Repair / Dismantling Workshops, EPD. · Practice Note for Professional Persons for Contaminated Land Assessment and Remediation, ProPECC PN 3/94
· Para 6.7 of Appendix 7C	· A pilot test shall be conducted to ascertain the concrete mix receipe and leachability of the product prior to a full scale solidification and a method statement detailing the solidification procedure (including the sampling proposal for process monitoring) shall be submitted to EPD for endorsement.	All areas identified to require solidification of soil as land remediation / The pilot test results and method statement shall be submitted and endorsed prior to the full scale solidification works.	Environmental consultant, land remediation contractor, to be appointed by the project proponent		Ö
· Para 6.6 of Appendix 7C	· A method statement detailing the biopiling methodology, monitoring and verification procedures shall be submitted to EPD for endorsement.	All soil identified and to be identified as contaminated with TPH / The method statement shall be submitted and endorsed prior to the commencement of the biopiling works.	Environmental consultant, land remediation contractor, to be appointed by the project proponent	Ö
· Sec 7 · Para 6.1, 6.2, 6.3, 6.6, 6.7, 6.8, Table 6-2, 6-3, Table 6-4 & Table 6-5 and Para. 8.2.6 of Appendix 7C	· A Remediation Report should be submitted to EPD to demonstrate that the remediation work has been properly carried out.	All areas identified to require soil and groundwater remediation / The Remediation Report shall be submitted and endorsed prior to the commencement of the development construction works.	Environmental consultant, land remediation contractor, to be appointed by the project proponent.		Ö
· Addendum to Land Contamination Assessment	· Inspections of all the Yau Tong Bay marine lots for dioxin. Should there be signs of incineration facilities, burn pits or facilities that utilises high temperature burning, soil sampling for dioxin will be carried out. Details regarding such sampling shall be submitted to EPD for approval. A detailed proposal for dealing with dioxin contaminated material, if found, shall also be submitted to EPD for approval.	All the Yau Tong Bay marine lots Inspection and testing shall commence upon availability of site.	Environmental consultant, land remediation contractor, to be appointed by the project proponent.		Ö

[1] DSD have stated (by fax dated 25 April 2000) that they have no objection to the proposed communication channel between WSD and DSD for dealing with the emergency discharge at Yau Tong Sewage Pumping Station.

([2]) ERM Hong Kong Ltd. (March 2000). Agreement No. CE 70/97, Green Island Development Engineering Investigation and Planning Review. Environmental Impact Assessment Review - Biogas Assessment (Final).

Noise Monitoring Report
Location:					Date:
Weather:	Wind Strength: Wind Direction: Temperature: Cloud Cover: Other (e.g. rain, fog) Sea State (e.g. calm, choppy)
Equipment:
Calibration:		before:		after:
Measurement Time and Period:			Start:		Finish:
Recorded Level Leq dB(A):
Factors influencing Recorded Noise Level (if any) :
Construction Activity Noticeable during measurement period:
Recommendations / Conclusions:
Report prepared by: Signature: