Annex A   Implementation Schedule

1 IMPLEMENTATION SCHEDULE

This Annex provides a consolidation of the mitigation measures recommended for the Project.  The consolidation is presented in the form of an Implementation Schedule in accordance with the format specified in Section 3.4.11.3 of the EIA Study Brief No. ESB-087/2001.

The Implementation Schedule has the following column headings:

EIA Ref

This denotes the section number or reference from the EIA Report Main text.

EM&A Log Ref

This denotes the sequential number of each of the recommended mitigation measures specified in the Implementation Schedule.

Environmental Protection Measures

This denotes the recommended mitigation measures, courses of action or subsequent deliverables that are to be adopted, undertaken or delivered to avoid, minimise or ameliorate predicted environmental impacts.

Objectives

This denotes the objectives of the recommended mitigation measures and main concerns to address.

Location/Duration of Measures/Timing of Completion of Measures

This indicates the spatial area in which the recommended mitigation measures are to be implemented together with details of the programming or timing of their implementation.

Implementation Agent

This denotes where the responsibility lies for the implementation of the recommended mitigation measures.

Implementation Stage

This denotes the stage at which the recommended mitigation measures are to be implemented either during the Design, Construction, Operation or Decommissioning.

Relevant Legislation

This section defines the controlling legislation that is required to be compiled with.

Implementation Schedule

EIA* Ref.

EM&A Log Ref

Environmental Protection Measures

Objectives

Location/Duration of Measures/Timing of Completion of Measures

Implementation Agent

Implementation Stage**

Relevant Legislation & Guidelines

 

 

 

 

 

 

Des

C

O

Dec

 

4.7

 

WATER QUALITY - Construction Phase

 

 

 

 

 

 

 

 

 

 

1

Operational Constraints

 

 

 

 

 

 

 

 

 

 

The following operational constraints should be applied to the jetting and dredging works. 

To avoid potential adverse water quality impacts associated with jetting and dredging

During jetting and dredging

Construction Contractor

 

ü

 

 

 

 

 

·          The forward speed of the jetting machine should be limited to a maximum of 1.08 km day-1 (67.5 m hr-1 for 16 hours per day) in Tolo Harbour and Channel (as defined by the Tolo Harbour and Channel Water Control Zone) and 1.62 km day-1 in Mirs Bay (67.5 m hr-1 for 24 hours per day) (as defined by the Mirs Bay Water Control Zone).

·          A trailer suction hopper dredger should conduct the dredging and only one dredger is allowed to dredge at any one time along the pipelines route.

·          The dredging rate for the section within Mirs Bay should not exceed 11,880 m3 hour-1.  The hourly rate of dredging may be increased subject to further detailed modelling investigations to be agreed with EPD in advance.

·          No overflow is permitted from the trailer suction hopper dredger but the Lean Mixture Overboard (LMOB) system will be in operation at the beginning and end of the dredging cycle when the drag head is being lowered and raised. 

·          During jetting works within 2 km of the Tai Po Industrial Estate Seawall a silt curtain should be established as detailed in Figure 4.6a.

·          Excavation works at the Tai Po Landing Site should be conducted within a silt curtain established as detailed in Figure 4.6a.

·          Dredged marine mud shall be disposed of in a gazetted marine disposal area in accordance with the Dumping at Sea Ordinance (DASO) permit conditions.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dumping at Sea Ordinance (DASO)

 

2

Good Practices

 

 

 

 

 

 

 

 

 

 

The following good practices shall apply.

See below

During jetting and dredging

Construction Contractor

 

ü

 

 

 

 

 

·          All trailers shall be fitted with tight bottom seals.

To prevent leakage of dredged material during transport

 

 

 

 

 

 

 

 

 

·          All trailers shall be filled to an appropriate level, which ensures that material does not spill over during transport to the disposal site.

To ensure that dredged material does not spill over during transport to the disposal site

 

 

 

 

 

 

 

 

 

·          Adequate freeboard shall be maintained for all trailers. 

To ensure that the decks are not washed by wave action

 

 

 

 

 

 

 

 

 

·          After dredging, any excess materials shall be cleaned from decks and exposed fittings before the vessel is moved from the dredging area.

To avoid potential adverse water quality impacts

 

 

 

 

 

 

 

 

 

·          The contractor(s) shall ensure that the works cause no visible foam, oil, grease, litter or other objectionable matter to be present in the water within and adjacent to the dredging site.

To avoid potential adverse water quality impacts

 

 

 

 

 

 

 

 

 

·          The design of the suction heads on suction dredgers shall minimise over-break and sedimentation around the head.

To avoid potential adverse water quality impacts

 

 

 

 

 

 

 

 

 

·          Dragheads shall improve suction efficiency, thus reducing suction effect, for silty materials which contain significant quantities of organic material and natural gases.

To improve suction efficiency and reduce suction effect

 

 

 

 

 

 

 

 

 

·          Degassing systems shall be used

To avoid irregular cavitation within the pump

 

 

 

 

 

 

 

 

 

·          The speed of the control pump shall be carefully controlled.

To maximise the concentration where density of the transport mixture is critical

 

 

 

 

 

 

 

 

 

·          Monitoring and automation systems shall be used to improve the crew’s information regarding the various dredging parameters.

To improve dredging accuracy and efficiency

 

 

 

 

 

 

 

 

 

·          Control and monitoring systems shall be used to alert the crew to leaks or any other potential risks.

To alert the crew to leaks or any other potential risks

 

 

 

 

 

 

 

 

 

·          When the dredged material has been unloaded at the disposal areas, any material that has accumulated on the deck or other exposed parts of the vessel shall be removed and placed in the hold or a hopper.  Under no circumstances should decks be washed clean in a way that permits material to be released overboard.

To prevent release of dredged materials overboard

 

 

 

 

 

 

 

 

 

·          All pipe leakages shall be repaired promptly and plant shall not be operated with leaking pipes.

To prevent release of dredged materials

 

 

 

 

 

 

 

 

 

·          All dredgers shall maintain adequate clearance between vessels and the seabed at all states of the tide and reduce operations speed.

To ensure that under turbidity is not generated by turbulence from vessel movement or propeller wash

 

 

 

 

 

 

 

4.10

3

Water quality monitoring will be required for the following activities:

·          excavation works at the Tai Po seawall;

·          jetting works within 2 km of the Tai Po seawall;

·          jetting works within 2 km either side of Pak Sha Tau;

·          jetting works within Tolo Channel (between Wong Wan Tsui and Wong Chuk Kok Tsui);

·          jetting works within 2 km of the boundary of the Tung Ping Chau Marine Park; and

·          dredging works within 1 km of the HKSAR boundary on the Mainland side.

 

A pilot test, as detailed in the EM&A Manual will be required during the first three days of the jetting works to verify the jetting machine’s performance.

To ensure that unacceptable impacts do not occur during construction.

 

 

 

ü

 

 

 

5.6.2

 

WASTE- Planning and Design Phases

 

 

 

 

 

 

 

 

 

4

Construction &Demolition Material (C&DM)

 

 

 

 

 

 

 

 

 

 

The following waste management hierarchy shall be implemented during project planning and design.

To allow maximum waste reduction and achieve high reuse levels

During project planning and design stages

Onshore Areas

Construction Contractor

ü

 

 

 

 

 

 

·          avoidance and minimisation, that is, reduction of waste generation through changing or improving practices and design.

·          reuse of materials, thus avoiding disposal (generally with only limited reprocessing).

·          recovery and recycling, thus avoiding disposal (although reprocessing may be required).

·          treatment and disposal, according to relevant law, guidelines and good practice.

 

 

 

 

 

 

 

 

5.6.2

 

WASTE- Construction Phase

 

 

 

 

 

 

 

 

 

5

Excavated Materials

 

 

 

 

 

 

 

 

 

 

Excavated materials should be segregated from other wastes.

To avoid contamination thereby ensuring acceptability at public filling areas and avoiding the need for landfill disposal

Worksite/during construction

Construction Contractors

 

ü

 

 

WBTC No 16/96; WBTC 4/98A

 

 

A recording system shall be implemented to keep records of quantities of wastes generated, recycled and disposed (locations).

To monitor disposal of excavated materials

Worksite/during construction

Construction Contractors

 

ü

 

 

 

 

6

Construction &Demolition Material (C&DM)

 

 

 

 

 

 

 

 

 

 

C&DM shall be recycled as much as possible on-site.  Public fill and C&D waste shall be segregated and stored in different containers or skips to facilitate reuse or recycling of materials and their proper disposal.  Specific areas of the work site should be designated for such segregation and storage if immediate use is not practicable.

To enhance reuse, recycling and, as appropriate, proper disposal of C&DM

Work site/during construction

Construction Contractors

 

ü

 

 

Waste Disposal Ordinance (Cap.354); WBTC No 19/99; WBTC No 12/2002

 

 

The use of wooden hoardings shall not be allowed.  An alternative material, which can be reused or recycled, for example, metal (aluminium, alloy, etc) shall be used.

To achieve high reuse levels

Work site / during  construction

Construction Contractors

 

ü

 

 

WBTC No. 4/98, 5/98, 21/2002, 25/99, 12/2000.

 

7

Dredged Materials

 

 

 

 

 

 

 

 

 

 

Dredged marine mud shall be disposed of in a gazetted marine disposal area in accordance with the DASO permit conditions.

To minimise potential impacts on water quality during transportation and disposal of the dredged marine sediments

Worksite / during construction

Construction Contractors

 

ü

 

 

DASO Permit

 

8

Chemical Waste

 

 

 

 

 

 

 

 

 

 

Chemical waste, as defined by Schedule 1 of the Waste Disposal (Chemical Waste) (General) Regulation, shall be handled in accordance with the Code of Practice on the Packaging, Handling and Storage of Chemical Wastes as follows.

To minimise potential environmental impacts during packaging, handling and storage of chemical wastes

Work site/during construction

Construction Contractors

 

ü

 

 

Waste Disposal (Chemical Waste) (General) Regulation, Code on Practice on the Packaging, Labelling and Storage of Chemical Wastes

 

 

·          Containers used for storage of chemical wastes shall:

 

 

 

 

 

 

 

 

 

 

o         be suitable for the substance they are holding, resistant to corrosion, maintained in a good condition, and securely closed.

 

 

 

 

 

 

 

 

 

 

o         have a capacity of less than 450 L unless the specifications have been approved by the EPD.

 

 

 

 

 

 

 

 

 

 

o         display a label in English and Chinese in accordance with instructions prescribed in Schedule 2 of the Regulations.

 

 

 

 

 

 

 

 

 

 

·          The storage area for chemical wastes shall:

 

 

 

 

 

 

 

 

 

 

o         be clearly labelled and used solely for the storage of chemical waste.

 

 

 

 

 

 

 

 

 

 

o         be enclosed on at least 3 sides.

 

 

 

 

 

 

 

 

 

 

o         have an impermeable floor and bunding, of capacity to accommodate 110% of the volume of the largest container or 20% by volume of the chemical waste stored in that area, whichever is the greatest.

 

 

 

 

 

 

 

 

 

 

o         have adequate ventilation.

 

 

 

 

 

 

 

 

 

 

o         be covered to prevent rainfall entering (water collected within the bund must be tested and disposed of as chemical waste, if necessary).

 

 

 

 

 

 

 

 

 

 

o         be arranged so that incompatible materials are appropriately separated.

 

 

 

 

 

 

 

 

 

 

·          Disposal of chemical waste shall:

 

 

 

 

 

 

 

 

 

 

o         via a licensed waste collector.

o         to a facility licensed to receive chemical waste, such as the Chemical Waste Treatment Facility which also offers a chemical waste collection service and can supply the necessary storage containers. .

 

 

 

 

 

 

 

 

 

9

Sewage

 

 

 

 

 

 

 

 

 

 

An adequate number of portable toilets shall be provided for the on-site construction workforce.  The portable toilets shall be maintained in a state that will not deter the workers from using them.  Night soil should be regularly collected by a licensed collector for disposal at the Tai Po Sewage Treatment Works.

To minimise potential impacts on water quality arising from disposal of sewage

Worksite/during construction

Construction Contractors

 

ü

 

 

Waste Disposal Ordinance

(Cap. 354)

 

10

General Refuse

 

 

 

 

 

 

 

 

 

 

The following procedures and measures shall be implemented for the management of general refuse.

To minimise adverse impacts from waste management

Work site/during construction

Construction Contractors

 

ü

 

 

Waste Disposal Ordinance

(Cap. 354)

 

 

·          General refuse shall be stored in enclosed bins or compaction units separately from construction and chemical wastes.  A reputable waste collector shall be employed by the Contractor to remove general refuse from the site, separately from construction and chemical wastes, on a daily basis to minimise odour, pest and litter impacts.  The burning of refuse on construction sites is prohibited by law.

 

 

 

 

 

 

 

 

 

 

·          Aluminium cans are often recovered from the waste stream by individual collectors if they are segregated and made easily accessible.  As such, separate, labelled bins for their deposit shall be provided if feasible.

 

 

 

 

 

 

 

 

 

 

·          Office wastes can be reduced through the recycling of paper if volumes are large enough to warrant collection.  Participation in a local collection scheme shall be considered if available.  In addition, waste separation facilities for paper, aluminium cans, plastic bottles etc., should be provided.

 

 

 

 

 

 

 

 

 

11

Trip Ticketing System

 

 

 

 

 

 

 

 

 

 

A trip-ticket system shall be established in accordance with Works Bureau Technical Circular No. 21/2002.  The trip-ticket system shall be included as one of the contractual requirements and implemented by the Towngas.  Towngas should also conduct regular audits of the results of the system.

To monitor disposal of solid waste at transfer stations and landfills and to control fly-tipping.

Worksite/during construction

Towngas

 

ü

 

 

Works Bureau Technical Circular No. 21/2002

 

12

Staff Training

 

 

 

 

 

 

 

 

 

 

Training shall be provided to workers on the concepts of site cleanliness and on appropriate waste management procedures, including waste reduction, reuse and recycling at the beginning of the Contract.

To raise staff awareness on good site practices and waste management

Prior to commencement of construction

Construction Contractors

 

ü

 

 

 

Annex H

13

Waste Management Plan

 

 

 

 

 

 

 

 

 

 

The construction Contractors shall incorporate the above recommendations into a Waste Management Plan (WMP) for the construction works.  The WMP shall be submitted to Towngas for approval prior to commencement of works.  The WMP shall incorporate site-specific factors, such as the designation of areas for the segregation and temporary storage of reusable and recyclable materials.

To describe the arrangements for avoidance, reuse, recovery and recycling, storage, collection, treatment and disposal (including disposal sites) of different waste types to be generated from construction.

Prior to construction

Construction Contractors

 

ü

 

 

Waste Disposal Ordinance (Cap.354); WBTC No 29/2000

 

5.6.3

14

WASTE - Operation Phase

 

 

 

 

 

 

 

 

 

 

No mitigation measures are required.

 

 

 

 

 

 

 

 

6.7

15

Marine Ecology – Planning and Design Phases

 

 

 

 

 

 

 

 

 

 

In accordance with the guidelines in the EIAO TM on marine ecology impact assessment, the general policy for mitigating impacts to marine ecological resources, in order of the following priority, shall be applied.

To avoid potential impacts to marine ecological resources

During project planning and design

Design Team

ü

 

 

 

 

 

 

·          Avoidance:  Potential impacts should be avoided to the maximum extent practicable by adopting suitable alternatives.

 

 

 

 

 

 

 

 

 

 

·          Minimisation:  Unavoidable impacts should be minimised by taking appropriate and practicable measures such as constraints on the intensity of works operations (eg dredging rates) or timing of works operations.

 

 

 

 

 

 

 

 

 

 

·          Compensation:  The loss of important species and habitats may be provided for elsewhere as compensation.  Enhancement and other conservation measures should always be considered whenever possible.

 

 

 

 

 

 

 

 

 

 

Impacts to marine ecological resources have largely been avoided during the installation of the pipelines through the following measures.

To avoid potential impacts to marine ecological resources

During project planning and design

Design Team

ü

 

 

 

 

 

 

·          Pipelines Alignment:  A number of alternative pipeline routes were studied and the preferred alignment avoids direct impacts to ecologically sensitive habitats and species.

 

 

 

 

 

 

 

 

 

 

·          Bundle Configuration:  As the pipelines will be bundled together and laid in the same trench the area of direct impact has been reduced and consequently the magnitude of potential impacts to ecological resources reduced.

 

 

 

 

 

 

 

 

 

 

·          Reduction in Indirect Impacts:  The alignment chosen for the two pipelines is located at a sufficient distance from ecological sensitive receivers so that the temporary dispersion of sediment from the installation works does not affect the receivers at levels of concern (as defined by the WQO and tolerance criteria).  By laying the pipelines in the same trench, the horizontal spread of suspended sediment is restricted to a confined area in the centre of the Tolo Channel.  Should the pipelines have been laid in separate trenches the horizontal spread of suspended sediment would have been much larger.

 

 

 

 

 

 

 

 

 

 

·          Installation Equipment:  The use of injection jetting along the majority of the route has minimised the severity of perturbations to water quality and hence allowed compliance with the WQOs at the sensitive receivers.  This careful selection of installation equipment has helped avoid impacts to sensitive ecological receivers such as corals.

 

 

 

 

 

 

 

 

 

 

·          Adoption of Acceptable Working Rates:  The modelling work has demonstrated that the selected working rates for the dredging and jetting works will not cause unacceptable impacts to the receiving water quality.  Consequently, unacceptable indirect impacts to marine ecological resources have been avoided.

 

 

 

 

 

 

 

 

6.7

16

Marine Ecology – Construction Phase

 

 

 

 

 

 

 

 

 

 

1.1.1.          Marine ecology monitoring will be required for the following activities:

·          jetting works within Tolo Channel (between Wong Wan Tsui and Wong Chuk Kok Tsui); and,

·          dredging works on the Mainland side within 1km of the HKSAR border.

To avoid impacts to marine ecological resource during construction

During pipelines installation

Contractor

 

ü

 

 

 

6.7

17

Marine Ecology – Operation Phase

 

 

 

 

 

 

 

 

 

 

No mitigation measures are required.

 

 

 

 

 

 

 

 

7.7

18

Fisheries – Planning and Design Phases

 

 

 

 

 

 

 

 

 

 

In accordance with the guidelines in the EIAO TM, the general policy for mitigating impacts to fisheries shall be applied in order of the following priority: avoidance, minimization and compensation.

To avoid potential impacts to fisheries resources

During project planning and design

Design Team

ü

 

 

 

 

7.7

19

Fisheries – Construction Phase

 

 

 

 

 

 

 

 

 

 

No mitigation measures are required.

 

 

 

 

 

 

 

 

7.7

20

Fisheries – Operation Phase

 

 

 

 

 

 

 

 

 

 

No mitigation measures are required.

 

 

 

 

 

 

 

 

8.9

21

Risk 

 

 

 

 

 

 

 

 

 

 

Gas Receiver Station

 

 

 

 

 

 

 

 

 

 

Well-defined operational and maintenance procedures for receiving operations shall be implemented.

To avoid potential environmental impacts related to landfill gas and leachate during operation

During operation of the Gas Receiver Station

 

 

 

ü

 

 

 

 

Liaison with external parties (e.g Fire Services Department and adjoining facilities) shall be undertaken.

To ensure that an off-site emergency plan is in place in the event of an incident at the Gas Receiving Station

During operation of the Gas Receiver Station

 

 

 

ü

 

 

 

22

Route Option 2 Onshore Pipelines

 

 

 

 

 

 

 

 

 

 

The location of the pipelines shall be clearly marked on admiralty charts.

To limit the potential for damage due to excavation works

During operation of the pipelines

 

 

 

ü

 

 

 

 

Liaison with external parties (e.g Fire Services Department and adjoining facilities) shall be undertaken.

To ensure that an off-site emergency plan is in place in the event of a pipeline incident

During operation of the pipelines

 

 

 

ü

 

 

 

23

Subsea Pipelines

 

 

 

 

 

 

 

 

 

 

The location of the pipelines shall be clearly marked on admiralty charts.

To limit the potential for damage due to anchor impact

During operation of the pipelines

 

 

 

ü

 

 

 

 

Additional pipeline protection ie rock armour, shall be provided.  The practicability of additional pipeline protection should has been subjected to a detailed risk assessment.

To provide additional pipeline protection

During operation of the pipelines

 

 

 

ü

 

 

 

 

Landfill Gas – Construction Phase

 

 

 

 

 

 

 

 

9.8

24

Safety Plan

 

 

 

 

 

 

 

 

 

 

The Contractor’s Safety Plan shall be reviewed and verified to ensure adequate consideration has been given by the Contractor to the occurrence and management of emergency situations and that emergency plans have been developed to cover contingencies relating to landfill gas and leachate.

To ensure the Contractor’s Safety Plan is technically robust

Prior to commencement of construction

Towngas

 

ü

 

 

 

9.8

25

Method Statements

 

 

 

 

 

 

 

 

 

 

The Contractor shall submit Method Statements or statements of working procedures to the Engineer prior to commencing specific activities on site.

To ensure that adequate measures are incorporated in the procedures to counter any possible adverse effects.

Prior to commencement of construction

Construction Contractor

 

ü

 

 

 

9.7.3

26

Precautionary Measures

 

 

 

 

 

 

 

 

 

 

The following precautionary measures shall be implemented when works are to be carried out within the Consultation Zone of Shuen Wan Landfill.

See below

During construction within the Consultation Zone of Shuen Wan Landfill.

 

 

ü

 

 

 

 

 

·          During all works, safety procedures should be implemented to minimise the risks of fires and explosions, asphyxiation of workers and toxicity effects resulting from contact with contaminated soils and groundwater.

To minimise the risks of fires and explosions, asphyxiation of workers and toxicity effects resulting from contact with contaminated soils and groundwater.

 

 

 

 

 

 

 

 

 

·          Safety officers, specifically trained with regard to landfill gas and leachate related hazards and the appropriate actions to take in adverse circumstances, shall be present on the site throughout the works, in particular, when works are undertaken below ground.

 

 

 

 

 

 

 

 

 

 

·          All personnel who work inside the pipeline trench should be made aware of the possibility of ignition of gas in the vicinity of the works, the possible presence of contaminated water and the need to avoid physical contact with it.

 

 

 

 

 

 

 

 

 

 

·          Monitoring for methane, carbon dioxide and oxygen shall be undertaken at work areas within the Consultation Zone of the Shuen Wan Landfill where works involve deep excavations or entry into confined spaces ie manhole.  The frequency and areas to be monitored shall be documented in the Contractors Safety Plan prior to commencement of works.

 

 

 

 

 

 

 

 

 

 

·          All monitoring shall be carried out by trained technicians and equipment calibrated according to the manufacturers instructions.  A standard record form, detailing the location, time of monitoring and equipment used, together with the gas concentrations measured, shall be used to ensure all relevant data are recorded for future reference.

 

 

 

 

 

 

 

 

 

 

·          Depending on the results of gas monitoring and the environment under which it is conducted (ie confined space or atmospheric works), appropriate actions will vary and shall be stated as part of the Contractor’s safety plan.

 

 

 

 

 

 

 

 

 

 

·          Enhanced personal hygiene practices including washing thoroughly after working and eating only in "clean" areas should be adopted where contact may have been made with any groundwater which is thought to be contaminated with leachate.

 

 

 

 

 

 

 

 

9.8.1

27

Landfill Gas – Operation Phase

 

 

 

 

 

 

 

 

 

 

No mitigation measures are required.

 

 

 

 

 

 

 

 

10.5

28

Air Quality

 

 

 

 

 

 

 

 

 

 

Dust suppression measures in accordance with the Air Pollution Control (Construction Dust) Regulation shall be implemented and incorporated into the Contract Specification.

To minimise potential dust nuisance arising from the works.

During construction

Construction Contractor

 

ü

 

 

 

11.7

29

Cultural Heritage

 

 

 

 

 

 

 

 

 

 

No mitigation measures are required.