Table I – Recommended Mitigation Measures stipulated in EM&A Manual of the Project

(Further information on observations/reminders/non-compliance made during site audit should refer to Table II)

 

Key:       ^      Mitigation measure was fully implemented.            

*      Observation/reminder was made during site audit but improved/rectified by the contractor.

#      Observation/reminder was made during site audit but not yet improved/rectified by the contractor.

X     Non-compliance of mitigation measure

·      Non-compliance but rectified by the contractor

N/A  Not Applicable

 

EIA Ref.

Recommended Mitigation Measures

Objectives of the recommended Measures & Main Concerns to address

Who to implement the measures?

Location of the measures

When to

Implement the measures?

What requirements or standards for the measures to achieve?

Status

Air Quality Impact

S3.8.1

Watering eight times a day on active works areas, exposed areas and paved haul roads 

To minimize the dust impact

Contractor

All Active Work Sites

Construction phase

APCO

*(1)/#(1)

S3.8.1

Enclosing the unloading process at barging point by a 3-sided screen with top tipping hall, provision of water spraying and flexible dust curtains 

To minimize the dust impact

Contractor

Barging Points

Construction phase

APCO

N/A

S3.8.7

Dust suppression measures stipulated in the Air Pollution Control (Construction Dust) Regulation and good site practices:

-       Use of regular watering to reduce dust emissions from exposed site surfaces and unpaved roads, particularly during dry weather.

-       Use of frequent watering for particularly dusty construction areas and areas close to ASRs.

-       Side enclosure and covering of any aggregate or dusty material storage piles to reduce emissions.  Where this is not practicable owing to frequent usage, watering shall be applied to aggregate fines.

-       Open stockpiles shall be avoided or covered.  Where possible, prevent placing dusty material storage piles near ASRs.

-       Tarpaulin covering of all dusty vehicle loads transported to, from and between site locations.

-       Establishment and use of vehicle wheel and body washing facilities at the exit points of the site.

-       Provision of wind shield and dust extraction units or similar dust mitigation measures at the loading area of barging point, and use of water sprinklers at the loading area where dust generation is likely during the loading process of loose material, particularly in dry seasons/ periods.

-       Provision of not less than 2.4m high hoarding from ground level along site boundary where adjoins a road, streets or other accessible to the public except for a site entrance or exit.

-       Imposition of speed controls for vehicles on site haul roads.

-       Where possible, routing of vehicles and positioning of construction plant should be at the maximum possible distance from ASRs

-       Every stock of more than 20 bags of cement or dry pulverised fuel ash (PFA) should be covered entirely by impervious sheeting or placed in an area sheltered on the top and the 3 sides.

-       Instigation of an environmental monitoring and auditing program to monitor the construction process in order to enforce controls and modify method of work if dusty conditions arise.

To minimize the dust impact

Contractor

All Construction Work Sites

Construction phase

APCO and Air Pollution Control (Construction Dust) Regulation

 

 

*(1)/#(1)

 

*(1)/#(1)

 

^

 

 

^

 

^

 

^

 

N/A

 

 

 

^

 

 

^

^

 

*(1)/#(1)

 

 

^

 

/

Emission from Vehicles and Plants

·              All vehicles shall be shut down in intermittent use.

·              Only well-maintained plant should be operated on-site and plant should be serviced regularly to avoid emission of black smoke.

·              All diesel fuelled construction plant within the works areas shall be powered by ultra low sulphur diesel fuel (ULSD)

Reduce air pollution emission from construction vehicles and plants

Contractor

All construction sites

Construction stage

• APCO

 

 

^

*(1)/#(1)

 

^

/

Valid No-road Mobile Machinery (NRMM) labels should be provided to regulated machines

Reduce air pollution emission from construction vehicles and plants

Contractor

All construction sites

Construction stage

• APCO

 

^

 

Noise Impact (Construction Phase)

S4.8

-       Use of quiet PME. Use of movable noise barriers for Excavator, Lorry, Dump Truck, Mobile Crane, Compactor, Concrete Mixer Truck, Concrete Lorry Mixer, Breaker, Mobile Crusher, Backhoe, Vibratory Poker, Saw, Asphalt Paver, Vibratory Roller, Vibrolance, Hydraulic Vibratory Lance and Piling (Vibration Hammer). Use of full enclosure for Air Compressor, Compressor, Bar Bender, Generator, Drilling Rig, Chisel, Large Diameter Bore Piling, Grout Mixer & Pump and Concrete Pump.

To minimize construction noise impact arising from the Project at the affected NSRs

Contractor

Work Sites

Construction phase

EIAO-TM, NCO

N/A

 

Noise Mitigation Plan

Use of Temporary Noise Barriers or Full Enclosure for PME according to the approved Noise Mitigation Plan

To minimize construction noise impact arising from the Project at the affected NSRs

Contractor

Work Sites

Construction phase

EIAO-TM, NCO

*(2)/#(2)

S4.9

Good Site Practice

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

-       Silencers or mufflers on construction equipment should be utilized and should be properly maintained during the construction program.

-       Mobile plant, if any, should be sited as far away from NSRs as possible.

-       Machines and plant (such as trucks) that may be in intermittent use should be shut down between works periods or should be throttled down to a minimum.

-       Plant known to emit noise strongly in one direction should, wherever possible, be orientated so that the noise is directed away from the nearby NSRs.

-       Material stockpiles and other structures should be effectively utilized, wherever practicable, in screening noise from on-site construction activities.

To minimize construction noise impact arising from the Project at the affected NSRs

Project Proponent

Work sites

Construction Period

EIAO-TM, NCO

 

^

 

^

 

^

^

 

^

 

^

 

S4.9

Scheduling of Construction Works during School Examination Period

 

To minimize construction noise impact arising from the Project at the affected NSRs

Contractor

Work site near school

Construction phase

EIAO-TM, NCO

N/A

Water Quality Impact (Construction Phase)

S5.6.24

The dry density of filling material for the TKO-LT Tunnel reclamation should be 1,900kg/m3, with fine content of 25% or less

Control potential impacts from filling activities

CEDD’s Contractors

Work site

Construction Phase

EIAO-TM, WPCO

N/A

S5.8.1

Non-dredged method by constructing steel cellular caisson structure with stone column shall be adopted for construction of seawall foundation.  During the stone column installation (also including the installation of steel cellular caisson), silt curtain shall be employed around the active stone column installation points.

Control potential impacts from filling activities

CEDD’s Contractors

Work site

Construction Phase

EIAO-TM, WPCO

N/A

S5.8.2

Formation of seawall enclosing the reclamation for Road P2 (notwithstanding an opening of about 50m for marine access) shall be completed prior to the filling activities.  The seawall opening of about 50m wide for marine access shall be selected at a location as indicatively shown in Appendix 5.10. No more than 3 filling barge trips per day shall be made with a maximum daily rate of 3,000m3 (i.e. 1,000 m3 per trip) for the filling operation at the reclamation area for Road P2.  All filling works shall be carried out behind the seawall with the use of single silt curtain at the marine access.

Control potential impacts from filling activities

CEDD’s Contractors

Work site

Construction Phase

EIAO-TM, WPCO

N/A

S5.8.3

Other good site practices should be undertaken during filling operations include:

-       all marine works should adopt the environmental friendly construction methods as far as practically possible including the use of cofferdams to cover the construction area to separate the construction works from the sea;

-       floating single silt curtain shall be employed for all marine works;

-       all vessels should be sized so that adequate clearance is maintained between vessels and the seabed in all tide conditions, to ensure that undue turbidity is not generated by turbulence from vessel movement or propeller wash;

-       all hopper barges should be fitted with tight fitting seals to their bottom openings to prevent leakage of material;

-       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 reduce the likelihood of decks being washed by wave action;

-       loading of barges and hoppers should be controlled to prevent splashing of filling material into the surrounding water.  Barges or hoppers should not be filled to a level that will cause the overflow of materials or polluted water during loading or transportation;

-       any pipe leakages shall be repaired quickly. Plant should not be operated with leaking pipes;

-       construction activities should not cause foam, oil, grease, scum, litter or other objectionable matter to be present on the water within the site or dumping grounds; and

-       before commencement of the reclamation works, the holder of Environmental Permit has to submit plans showing the phased construction of the reclamation, design and operation of the silt curtain.

Control potential impacts from filling activities and marine-based construction

CEDD’s Contractors

Work site

Construction Phase

EIAO-TM, WPCO, Waste Disposal Ordinance (WDO)

 

*(3)/#(3)

 

 

*(3)/#(3)

^

 

 

^

 

*(3)/#(3)

 

^

 

^

 

 

^

 

^

 

^

S5.8.4

Site specific mitigation plan for reclamation areas using public fill materials should be submitted for EPD agreement before commencement of construction phase with due consideration of good site practices.

Control potential impacts from filling activities and marine based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

N/A

ERR S5.6.1

To minimize water quality impact arising from the dredging and filling works for Reclamation for Road P2, the following mitigation measures shall be implemented:

-          Before carrying out any dredging and underwater filling works, a temporary barrier shall first be constructed to a height above the high water mark to completely enclose the works site (without any opening at the barrier wall)

-          The temporary barrier fully enclosing the dredging and underwater filling works site shall not be removed before completion of all dredging and underwater filling works.

-          Water quality sampling and testing shall be carried out to demonstrate that the water quality inside the enclosed barrier is comparable to the ambient or baseline levels prior to the removal of the fully enclosed barrier. 

-          Silt curtains shall be deployed for the installation and removal of the temporary barrier and at the double water gates marine access opening during its operation. The general of arrangement of silt curtain is shown in Figure 7 of the existing Environmental Permit (No. EP-458/2013/C).

Control potential impacts from dredging and filling works for Reclamation for Road P2

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

 

 

^

 

 

^

 

N/A

 

 

^

S5.8.5

It is important that appropriate measures are implemented to control runoff and drainage and prevent high loading of SS from entering the marine environment.  Proper site management is essential to minimise surface water runoff, soil erosion and sewage effluents.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

^

 

S5.8.6

Any practical options for the diversion and realignment of drainage should comply with both engineering and environmental requirements in order to ensure adequate hydraulic capacity of all drains.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Design Stage and Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO, TM-DSS

^

S5.8.7

Construction site runoff and drainage should be prevented or minimised in accordance with the guidelines stipulated in the EPD's Practice Note for Professional Persons, Construction Site Drainage (ProPECC PN 1/94). Good housekeeping and stormwater best management practices, as detailed in below, should be implemented to ensure that all construction runoff complies with WPCO standards and no unacceptable impact on the WSRs arises due to construction of the TKO-LT Tunnel.  All discharges from the construction site should be controlled to comply with the standards for effluents discharged into the corresponding WCZ under the TM-DSS.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO, TM-DSS

*(4)

S5.8.8

Exposed soil areas should be minimised to reduce the potential for increased siltation, contamination of runoff, and erosion.  Construction runoff related impacts associated with the above ground construction activities can be readily controlled through the use of appropriate mitigation measures which include:

-       use of sediment traps; and

-       adequate maintenance of drainage systems to prevent flooding and overflow.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

 

 

 

 

N/A

^

S5.8.9

Construction site should be provided with adequately designed perimeter channel and pretreatment facilities and proper maintenance.  The boundaries of critical areas of earthworks should be marked and surrounded by dykes or embankments for flood protection.  Temporary ditches should be provided to facilitate runoff discharge into the appropriate watercourses, via a silt retention pond.  Permanent drainage channels should incorporate sediment basins or traps and baffles to enhance deposition rates.  The design of efficient silt removal facilities should be based on the guidelines in Appendix A1 of ProPECC PN 1/94.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

^

 

S5.8.10

Ideally, construction works should be programmed to minimise surface excavation works during the rainy season (April to September). All exposed earth areas should be completed as soon as possible after earthworks have been completed, or alternatively, within 14 days of the cessation of earthworks where practicable.  If excavation of soil cannot be avoided during the rainy season, or at any time of year when rainstorms are likely, exposed slope surfaces should be covered by tarpaulin or other means.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

^

S5.8.11

Sedimentation tanks of sufficient capacity, constructed from pre-formed individual cells of approximately 6 to 8m3 capacity, are recommended as a general mitigation measure which can be used for settling surface runoff prior to disposal.  The system capacity is flexible and able to handle multiple inputs from a variety of sources and particularly suited to applications where the influent is pumped.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

S5

*(5)

S5.8.12

Earthworks final surfaces should be well compacted and the subsequent permanent work or surface protection should be carried out immediately after the final surfaces are formed to prevent erosion caused by rainstorms.  Appropriate drainage like intercepting channels should be provided where necessary.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

S5

^

S5.8.13

Measures should be taken to minimize the ingress of rainwater into trenches.  If excavation of trenches in wet seasons is necessary, they should be dug and backfilled in short sections.  Rainwater pumped out from trenches or foundation excavations should be discharged into storm drains via silt removal facilities.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

S5

^

S5.8.14

Open stockpiles of construction materials (for examples, aggregates, sand and fill material) of more than 50m3 should be covered with tarpaulin or similar fabric during rainstorms.  Measures should be taken to prevent the washing away of construction materials, soil, silt or debris into any drainage system.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

^

S5.8.15

Manholes (including newly constructed ones) should always be adequately covered and temporarily sealed so as to prevent silt, construction materials or debris being washed into the drainage system and storm runoff being directed into foul sewers.  Discharge of surface run-off into foul sewers must always be prevented in order not to unduly overload the foul sewerage system.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

^

 

S5.8.16

Precautions to be taken at any time of year when rainstorms are likely, actions to be taken when a rainstorm is imminent or forecast, and actions to be taken during or after rainstorms are summarised in Appendix A2 of ProPECC PN 1/94.  Particular attention should be paid to the control of silty surface runoff during storm events, especially for areas located near steep slopes.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

^

S5.8.17

Oil interceptors should be provided in the drainage system and regularly cleaned to prevent the release of oils and grease into the storm water drainage system after accidental spillages.  The interceptor should have a bypass to prevent flushing during periods of heavy rain.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

N/A

S5.8.18

All vehicles and plant should be cleaned before leaving a construction site to ensure no earth, mud, debris and the like is deposited by them on roads.  An adequately designed and located wheel washing bay should be provided at every site exit, and washwater should have sand and silt settled out and removed at least on a weekly basis to ensure the continued efficiency of the process.  The section of access road leading to, and exiting from, the wheelwash bay to the public road should be paved with sufficient backfall toward the wheel-wash bay to prevent vehicle tracking of soil and silty water to public roads and drains.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

^

S5.8.19

Silt removal facilities, channels and manholes should be maintained and the deposited silt and grit should be removed regularly, at the onset of and after each rainstorm to ensure that these facilities are functioning properly at all times.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

^

S5.8.20

It is recommended that on-site drainage system should be installed prior to the commencement of other construction activities. Sediment traps should be installed in order to minimise the sediment loading of the effluent prior to discharge into foul sewers. There shall be no direct discharge of effluent from the site into the sea.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

^

S5.8.21

All temporary and permanent drainage pipes and culverts provided to facilitate runoff discharge should be adequately designed for the controlled release of storm flows. All sediment control measures should be regularly inspected and maintained to ensure proper and efficient operation at all times and particularly following rain storms. The temporarily diverted drainage should be reinstated to its original condition when the construction work has finished or the temporary diversion is no longer required.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

^

S5.8.22

All fuel tanks and storage areas should be provided with locks and be located on sealed areas, within bunds of a capacity equal to 110% of the storage capacity of the largest tank, to prevent spilled fuel oils from reaching the coastal waters.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

^

 

S5.8.23

Minimum distances of 100m shall be maintained between the existing or planned stormwater discharges and the existing or planned seawater intakes during construction and operational phases

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

EIAO-TM, WPCO, TMDSS

^

S5.8.24

Under normal circumstances, groundwater pumped out of wells, etc. for the lowering of ground water level in basement or foundation construction, and groundwater seepage pumped out of tunnels or caverns under construction should be discharged into storm drains after the removal of silt in silt removal facilities.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

^

S5.8.25 - S5.8.27 & Table 5.18

Grouting would be adopted as measure to reduce the groundwater inflow into the tunnel. During the tunnel excavation, the inflow rate of groundwater into the tunnel will be measured during the excavation.  The groundwater levels above the tunnel will also be monitored by piezometers.  If the inflow rate exceeds the pre-determined groundwater control criteria or the groundwater drawdown exceeds the required limit, pre-excavation grouting will be required to reduce the groundwater inflow.  No significant change of groundwater levels would therefore be expected. Any chemicals/ foaming agents which would be entrained to the groundwater should be biodegradable and non-toxic throughout the tunnel construction.  Potential groundwater quality impact would be minimal as the used material is non-toxic and biodegradable.  No adverse groundwater quality would therefore be expected. Prescriptive measures in the form of an Action Plan with pre-emptive and re-active to preserve the groundwater levels at all times during the tunnel construction are set out in Table 5.18.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO, Buildings Ordinance

N/A

S5.8.28

Water used in ground boring and drilling for site investigation or rock / soil anchoring should as far as practicable be recirculated after sedimentation.  When there is a need for final disposal, the wastewater should be discharged into storm drains via silt removal facilities.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Design Stage and Construction Phas

ProPECC PN 1/94, EIAOTM, WPCO

N/A

S5.8.29 - S5.8.31

Wastewater generated from the washing down of mixing trucks and drum mixers and similar equipment should whenever practicable be recycled.  The discharge of wastewater should be kept to a minimum. To prevent pollution from wastewater overflow, the pump sump of any water recycling system should be provided with an online standby pump of adequate capacity and with automatic alternating devices. Under normal circumstances, surplus wastewater may be discharged into foul sewers after treatment in silt removal and pH adjustment facilities (to within the pH range of 6 to 10).  Disposal of wastewater into storm drains will require more elaborate treatment.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

^

S5.8.32

All vehicles and plant should be cleaned before they leave a construction site to ensure no earth, mud, debris and the like is deposited by them on roads.  A wheel washing bay should be provided at every site exit if practicable and wash-water should have sand and silt settled out or removed before discharging into storm drains.  The section of construction road between the wheel washing bay and the public road should be paved with backfall to reduce vehicle tracking of soil and to prevent site run-off from entering public road drains.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

^

S5.8.33

Bentonite slurries used in diaphragm wall and borepile construction should be reconditioned and reused wherever practicable.  If the disposal of a certain residual quantity cannot be avoided, the used slurry may be disposed of at the marine spoil grounds subject to obtaining a marine dumping licence from EPD on a case-by-case basis.                       

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

N/A

S5.8.34

If the used bentonite slurry is intended to be disposed of through the public drainage system, it should be treated to the respective effluent standards applicable to foul sewer, storm drains or the receiving waters as set out in the WPCO Technical Memorandum on Effluent Standards.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

N/A

S5.8.35

Water used in water testing to check leakage of     structures and pipes should be reused for other purposes as far as practicable.  Surplus unpolluted water could be discharged into storm drains.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

N/A

S5.8.36

Sterilization is commonly accomplished by chlorination.  Specific advice from EPD should be sought during the design stage of the works with regard to the disposal of the sterilizing water.  The sterilizing water should be reused wherever practicable.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Design Stage and Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

N/A

S5.8.37

Before commencing any demolition works, all sewer and drainage connections should be sealed to prevent building debris, soil, sand etc. from entering public sewers/drains.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

N/A

S5.8.38

Wastewater generated from building construction activities including concreting, plastering, internal decoration, cleaning of works and similar activities should not be discharged into the stormwater drainage system.  If the wastewater is to be discharged into foul sewers, it should undergo the removal of settleable solids in a silt removal facility, and pH adjustment as necessary

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

^

S5.8.39

Acidic wastewater generated from acid cleaning, etching, pickling and similar activities should be neutralized to within the pH range of 6 to 10 before discharging into foul sewers.  If there is no public foul sewer in the vicinity, the neutralized wastewater should be tinkered off site for disposal into foul sewers or treated to a standard acceptable to storm drains and the receiving waters

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

^

S5.8.40

Wastewater collected from canteen kitchens, including that from basins, sinks and floor drains, should be discharged into foul sewer via grease traps capable of providing at least 20 minutes retention during peak flow.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

N/A

S5.8.41

Drainage serving an open oil filling point should be connected to storm drains via a petrol interceptor with peak storm bypass.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

^

S5.8.42

Vehicle and plant servicing areas, vehicle wash bays and lubrication bays should as far as possible be located within roofed areas. The drainage in these covered areas should be connected to foul sewers via a petrol interceptor. Oil leakage or spillage should be contained and cleaned up immediately. Waste oil should be collected and stored for recycling or disposal in accordance with the Waste Disposal Ordinance.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

*(6)/#(6)

S5.8.43

Construction work force sewage discharges on site are expected to be connected to the existing trunk sewer or sewage treatment facilities. The construction sewage may need to be handled by portable chemical toilets prior to the commission of the on-site sewer system. Appropriate numbers of portable toilets shall be provided by a licensed contractor to serve the large number of construction workers over the construction site. The Contractor shall also be responsible for waste disposal and maintenance practices.

Control potential impacts from construction site runoff and land-based construction

CEDD’s Contractors

Work site

Construction Phase

ProPECC PN 1/94, EIAOTM, WPCO

^

S5.8.44

Contractor must register as a chemical waste producer if chemical wastes would be produced from the construction activities. The Waste Disposal Ordinance (Cap 354) and its subsidiary regulations in particular the Waste Disposal (Chemical Waste) (General) Regulation should be observed and complied with for control of chemical wastes.

Control potential impacts from accidental spillage of chemicals

CEDD’s Contractors

Work site

Construction Phase

EIAO-TM, WPCO, WDO

^

S5.8.45

Any service shop and 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 leakage and spillage should only be undertaken within the areas appropriately equipped to control these discharges.

Control potential impacts from accidental spillage of chemicals

CEDD’s Contractors

Work site

Construction Phase

EIAO-TM, WPCO

*(7)

S5.8.46

Disposal of chemical wastes should be carried out in compliance with the Waste Disposal Ordinance. The “Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes” published under the Waste Disposal Ordinance details the requirements to deal with chemical wastes. General requirements are given as follows:

-       suitable containers should be used to hold the chemical wastes to avoid leakage or spillage during storage, handling and transport;

-       chemical waste containers should be suitably labelled, to notify and warn the personnel who are handling the wastes, to avoid accidents; and

-       storage area should be selected at a safe location on site and adequate space should be allocated to the storage area.

Control potential impacts from accidental spillage of chemicals

CEDD’s Contractors

Work site

Construction Phase

EIAO-TM, WPCO, WDO

 

 

 

 

^

 

^

 

^

 

S5.8.47

Collection and removal of floating refuse should be performed at regular intervals on a daily basis.  The contractor should be responsible for keeping the water within the site boundary and the neighbouring water free from rubbish.

Control potential impacts from floating refuse and debris

CEDD’s Contractors

Work site

Construction Phase

EIAO-TM, WPCO,

*(8)

Ecological Impact

S6.8.4

Measures to Minimize Disturbance

-      Use of Quiet Mechanical Plant during the construction phase should be adopted wherever possible.

-      Hoarding or fencing should be erected around the works area boundaries during the construction phase. The hoarding would screen adjacent habitats from construction phase activities, reduce noise disturbance to these habitats and also to restrict access to habitats adjacent to works areas by site workers;

-      Regular spraying of haul roads to minimize impacts of dust deposition on adjacent vegetation and habitats during the construction activities

Minimize noise, human and traffic disturbance  to terrestrial habitat and wildlife; and reduce dust generation

Design Team / Contractor

Land-based works are

Construction Phase

N/A

 

^

 

^

 

 

 

^

S6.8.5

Standard Good Site Practice

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

-       Construction activities should be restricted to works areas that should be clearly demarcated. The works areas should be reinstated after completion of the works.

-     Waste skips should be provided to collect general refuse and construction wastes. The wastes should be properly disposed off-site in a timely manner.

-     General drainage arrangements should include sediment and oil traps to collect and control construction site run-off.

-     Open burning on works sites is illegal, and should be strictly prohibited.

-     Measures should also be put into place so that litter, fuel and solvents do not enter the nearby watercourses.

Reduce disturbance to surrounding habitats

Contractor

Land-based works are

Construction Phase

N/A

 

*(9)

 

^

 

*(9)

 

*(9)

 

^

^

S6.8.6

Measure to Minimize Groundwater Inflow

-     The drained tunnel construction method with groundwater inflow control measures would generally be adopted.  

-     During the tunnel excavation, pre-excavation grouting could be adopted to reduce the groundwater inflow and ensure that the tunnel would meet the long term water tightness requirements. 

Minimize groundwater inflow

Contractor

Tunnel

Construction Phase

N/A

 

N/A

 

N/A

S6.8.8

Measure to Minimize Impact on Corals

Coral translocation

-     It is recommended to translocate the affected coral colonies, except the locally common Oulastrea crispata, within the reclamation area and bridge footprint to the other suitable locations as far as practicable.   

-     The coral translocation should be conducted during the winter months (November-March) in order to avoid disturbance during their spawning period (i.e. July to October).  

-     A detailed coral translocation plan with a description on the methodology for pretranslocation coral survey, translocation methodology, identification/proposal of coral recipient site, monitoring methodology for posttranslocation should be prepared during the detailed design stage.  

-     The coral translocation plan should be subject to approval by relevant authorities (e.g. EPD and AFCD) before commencement of the coral translocation. All the translocation exercises should be conducted by experienced marine ecologist(s) who is/are approved by AFCD prior to commencement of coral translocation.

Post translocation Monitoring

-     A coral monitoring programme is recommended to assess any adverse and unacceptable impacts to the translocated coral communities

-     Information gathered during each posttranslocation monitoring survey should include observations on the presence, survival, health condition and growth of the translocated coral colonies.  These parameters should then be compared with the baseline results collected from the pre-translocation survey.

Minimize loss of coral

          

Design team, contractor, project operator

Within reclamation areas and pier footprint

Prior construction

N/A

 

 

^

 

 

^

 

^

 

 

^

 

 

 

 

 

^

 

^

S6.8.9 S6.8.10

Measure to Control Water Quality Impact

-     Deployment of silt curtains around the active stone column installation points, opening of newly installed seawall and marine works area.

-     Diverting of the site runoff to silt trap facilities before discharging into storm drain;

-     Proper waste and dumping management; and 

-     Standard good-site practice for land-based construction.

Control water quality impact, especially on suspended solid level; minimize the contamination of wastewater discharge, accidental chemical spillage and construction site runoff to the receiving water bodies

Design Team, contractor

Marine and landbased works area

Construction phase

WQO

 

N/A

 

^

 

^

^

S6.8.11

Compensation for Vegetation Loss

-       Felling of mature trees should be compensated by planting of standard or heavy standard trees within or in vicinity of the affected area as far as practicable.  Such compensatory planting for trees should be provided with at least a 1:1 ratio.  In addition, vegetation at the temporarily affected area should be reinstated with species similar to the existing condition.

Compensate for the vegetation loss

Design Team, contractor

Land-based works area

Construction phase

N/A

 

^

Fisheries Impact

S7.7.3

Measure to Control Water Quality Impact

-       Deployment of silt curtains around the active stone column installation points, opening of newly installed seawall and marine works area.

Control water quality impact, especially on suspended solid level

Design Team / Contractor

Marine work area

Construction phase

WQO

 

^

Waste Management (Construction Phase)

S8.6.3

Good Site Practices and Waste Reduction Measures

-       Nomination of an approved person, such as a site manager, to be responsible for good site practices, arrangements for collection and effective disposal to an appropriate facility, of all wastes generated at the site;

-       Training of site personnel in site cleanliness, proper waste management and chemical handling procedures;

-       Provision of sufficient waste disposal points and regular collection of waste;

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

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

To reduce waste management impacts

Contractor

All work sites

Construction Phase

Waste Disposal Ordinance (Cap. 354)

 

Land (Miscellaneous Provisions) Ordinance (Cap. 28)

 

^

 

 

^

 

*(10)/#(10)

^

 

*(10)/#(10)

^

S8.6.4

Good Site Practices and Waste Reduction Measures (con’t)

-       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;

-       Encourage collection of aluminium cans by providing separate labelled bins to enable this waste to be segregated from other general refuse generated by the workforce;

-       Proper storage and site practices to minimize the potential for damage or contamination of construction materials; and

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

To achieve waste reduction

Contractor

All work sites

Construction Phase

Waste Disposal Ordinance (Cap. 354)

 

Land (Miscellaneous Provisions) Ordinance (Cap. 28)

 

^

 

^

 

^

 

^

S8.6.5

Good Site Practices and Waste Reduction Measures (con’t)

The Contractor shall prepare and implement a WMP as part of the EMP in accordance with ETWB TCW No. 19/2005 which describes the arrangements for avoidance, reuse, recovery, recycling, storage, collection, treatment and disposal of different categories of waste to be generated from the construction activities. Such a management plan should incorporate site specific factors, such as the designation of areas for segregation and temporary storage of reusable and recyclable materials. The EMP should be submitted to the Engineer for approval.  The Contractor should implement the waste management practices in the EMP throughout the construction stage of the Project. The EMP should be reviewed regularly and updated by the Contractor.    

To achieve waste reduction

Contractor

All work sites

Construction Phase

ETWB TCW No. 19/2005

 

^

S8.6.6

Good Site Practices and Waste Reduction Measures (con’t)

-       C&D materials would be reused in the project and other local concurrent projects as far as possible.

To achieve waste reduction

Contractor

All work sites

Construction Phase

ETWB TCW No. 19/2005

 

^

S8.6.7

Storage, Collection and Transportation of Waste

Should any temporary storage or stockpiling of waste is required, recommendations to minimize the impacts include: 

-       Waste, such as soil, should be handled and stored well to ensure secure containment, thus minimizing the potential of pollution;

-       Maintain and clean storage areas routinely;

-       Stockpiling area should be provided with covers and water spraying system to prevent materials from wind-blown or being washed away; and

-       Different locations should be designated to stockpile each material to enhance reuse.

To minimize potential adverse environmental impacts arising from waste storage

Contractor

All work sites

Construction Phase

-

 

 

 

^

 

^

^

 

^

S8.6.8

Storage, Collection and Transportation of Waste (con’t)

-       Remove waste in timely manner;

-       Waste collectors should only collect wastes prescribed by their permits;

-       Impacts during transportation, such as dust and odour, should be mitigated by the use of covered trucks or in enclosed containers;

-       Obtain relevant waste disposal permits from the appropriate authorities, in accordance with the Waste Disposal Ordinance (Cap. 354), Waste Disposal (Charges for Disposal of Construction Waste) Regulation (Cap. 345) and the Land (Miscellaneous Provisions) Ordinance (Cap. 28);

-       Waste should be disposed of at licensed waste disposal facilities; and

-       Maintain records of quantities of waste generated, recycled and disposed.

To minimize potential adverse environmental impacts arising from waste collection and disposal

Contractor

All work sites

Construction Phase

 

 

*(10)/#(10)

^

^

 

^

 

 

 

^

^

S8.6.9

Storage, Collection and Transportation of Waste (con’t)

-       Implementation of trip ticket system with reference to DEVB TC(W) No. 6/2010, Trip Ticket System for Disposal of Construction & Demolition Materials, to monitor disposal of waste and to control fly-tipping at PFRFs or landfills.  A recording system for the amount of waste generated, recycled and disposed (including disposal sites) should be proposed.

To minimize potential adverse environmental impacts arising from waste collection and disposal

Contractor

All work sites

Construction Phase

DEVB TCW No. 6/2010

 

^

S8.6.11 - S8.6.13

Sorting of C&D Materials

-       Sorting to be performed to recover the inert materials, reusable and recyclable materials before disposal off-site.

-       Specific areas shall be provided by the Contractors for sorting and to provide temporary storage areas for the sorted materials.

-       The C&D materials should at least be segregated into inert and non-inert materials, in which the inert portion could be reused and recycled in the reclamation as far as practicable before delivery to PFRFs. While opportunities for reusing the non-inert portion should be investigated before disposal of at designated landfills

To minimize potential adverse environmental

Contractor

All work sites

Construction Phase

 

DEVB TCW No. 6/2010

 

ETWB TCW No. 33/2002

 

ETWB TCW No. 19/2005

 

^

 

^

 

^

S8.6.15 – S8.6.16

Sediments

-       Sediment encountered may be reused as filling material on-site after cement stabilization. Cement-stabilization process is undertaken by mixing sediment and cement and will convert sediment to earth filling material. The treated sediment has to comply with Risk-Based Remediation Goals (RBRGs) before being reused in order not to raise any land contamination issue. The adoption of RBRGs to assess stabilized sediment has been proposed in the current C&DMMP. MFC has no adverse comment on the current C&DMMP. The sediment quality indicates that all sediments comply with most stringent RBRGs except for one sediment sample (TKO-EBH501 3-3.95m) with lead exceeding the RBRG. Except for the sediment sample (TKO-EBH501 3-3.95m), the chemical screening results do not indicate sediment as contaminated soil. It is anticipated that reuse of sediment except sediment sample (TKO-EBH501 3-3.95m) will not lead to land contamination.

-       Despite exceedance of RBRG, onsite reuse of sediment under sample (TKO-EBH501 33.95m) as filling material after cement stabilization is also a suitable treatment. Sediment quality indicates the sediment sample (TKO-EBH501 3-3.95m) exceed RBRG for lead. While cement stabilization will immobilize metal contaminants, it is capable to treat the exceedance on lead. The stabilized material should comply with UTS of Lead and UCS. If the treated material do not comply with UTS or UCS, re-stabilization have to be undertaken to meet compliance of UTS and UCS before reusing the treated sediment as filling material. However, further agreement on final disposal/treatment on sediment under sample (TKO-EBH501 3-3.95m) has to be sought from DEP

To ensure the sediment to be disposed of in an authorized and least impacted way

contractor

All works areas with sediments concern

Construction Phase

RBRG

 

N/A

 

 

 

 

 

 

 

 

 

 

 

 

N/A

S8.6.17 – S8.6.20

Sediments (con’t)

-       Requirements of the Air Pollution Control (Construction Dust) Regulation, where relevant, shall be adhered to during boring, excavation, transportation and disposal of sediments or cement stabilization of sediment.

-       A treatment area should be confined for carrying out the cement stabilization mixing and temporary stockpile. The area should be designed to prevent leachate from entering the ground. Leachate, if any, should be collected and discharged according to the Water Pollution Control Ordinance (WPCO).

-       In order to minimise the potential odour / dust emissions during boring, excavation and transportation of the sediment, the excavated sediments should be kept wet during excavation/boring and should be properly covered when placed on barges/trucks.  Loading of the excavated sediment to the barge should be controlled to avoid splashing and overflowing of the sediment slurry to the surrounding water.

-       In order to minimise the exposure to contaminated materials, workers should, when necessary, wear appropriate personal protective equipments (PPE) when handling contaminated sediments.  Adequate washing and cleaning facilities should also be provided on site.

To determine the best handling and treatment of sediment

Contractor

All works areas with sediments concern

Construction Phase

 

 

N/A

 

 

N/A

 

 

 

N/A

 

 

 

 

N/A

S8.6.21

Sediments (con’t)

-       Alternatively, excavated sediment can be treated with marine disposal. The basic requirements and procedures for excavated sediment disposal specified under ETWB TC(W) No. 34/2002 shall be followed. MFC is responsible for the provision and management of disposal capacity and facilities for the excavated sediment, while the permit of marine dumping is required under the Dumping at Sea Ordinance and is the responsibility of the DEP.

To ensure the sediment to be disposed of in an authorized and least impacted way

contractor

All works areas with sediments concern

Construction Phase

ETWB TC(W) No. 34/2002 & Dumping at Sea Ordinance

 

N/A

 

S8.6.23

Sediments (con’t)

-       For allocation of sediment disposal sites and application of marine dumping permit, separate SSTP has to be submitted to EPD for agreement under DASO. Additional site investigation, based on the SSTP, maybe carried out in order to confirm the disposal arrangements for the proposed sediments removal. A Sediment Quality Report (SQR) shall then be required for EPD agreement under DASO prior to the tendering of the construction contract, discussing in details the site investigation, testing results as well as the delineation of each of the categories of excavated materials and the corresponding types of disposal.

To determine the best handling and disposal option of sediment

Contractor

All works areas with sediments concern

Construction Phase

ETWB TC(W) No. 34/2002 & Dumping at Sea Ordinance

 

N/A

 

S8.6.24 -  S8.6.28

Sediments (con’t)

-       The excavated sediments is expected to be loaded onto the barge and transported to the designated disposal sites allocated by the MFC. The excaveted sediment would be disposed of according to its determined disposal options and ETWB TC(W) No. 34/2002.

-       Stockpiling of contaminated sediments should be avoided as far as possible.  If temporary stockpiling of contaminated sediments is necessary, the excavated sediment should be covered by tarpaulin and the area should be placed within earth bunds or sand bags to prevent leachate from entering the ground, nearby drains and surrounding water bodies. The stockpiling areas should be completely paved or covered by linings in order to avoid contamination to underlying soil or groundwater. Separate and clearly defined areas should be provided for stockpiling of contaminated and uncontaminated materials. Leachate, if any, should be collected and discharged according to the Water Pollution Control Ordinance (WPCO).

-       In order to minimise the potential odour / dust emissions during boring and transportation of the sediment, the excavated sediments should be kept wet during excavation/boring and should be properly covered when placed on barges.  Loading of the excavated sediment to the barge should be controlled to avoid splashing and overflowing of the sediment slurry to the surrounding water.

-       The barge transporting the sediments to the designated disposal sites should be equipped with tight fitting seals to prevent leakage and should not be filled to a level that would cause overflow of materials or laden water during loading or transportation. In addition, monitoring of the 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.

-       In order to minimise the exposure to contaminated materials, workers should, when necessary, wear appropriate personal protective equipments (PPE) when handling contaminated sediments.  Adequate washing and cleaning facilities should also be provided on site.

-       Another possible arrangement for Type 3 disposal is by geosynthetic containment. A geosynthetic containment method is a method whereby the sediments are sealed in geosynthetic containers and, at the disposal site, the containers would be dropped into the designated contaminated mud pit where they would be covered by further mud disposal and later by the mud pit capping, thereby meeting the requirements for fully confined mud disposal.

To ensure handling of sediments are in accordance to statutory requirements

Contractor

All works areas with sediments concern

Construction Phase

ETWB TC(W) No. 34/2002 & Dumping at Sea Ordinance

 

N/A

 

 

N/A

 

 

 

 

 

 

 

 

N/A

 

 

 

 

N/A

 

 

 

 

 

N/A

 

 

 

N/A

 

S8.6.26

Chemical Wastes.

-       If chemical wastes are produced at the construction site, the Contractor would be required to register with the EPD as a Chemical Waste Producer and to follow the guidelines stated in the Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes.  Good quality containers compatible with the chemical wastes should be used, and incompatible chemicals should be stored separately.  Appropriate labels should be securely attached on each chemical waste container indicating the corresponding chemical characteristics of the chemical waste, such as explosive, flammable, oxidizing, irritant, toxic, harmful, corrosive, etc.  The Contractor shall use a licensed collector to transport and dispose of the chemical wastes, to either the Chemical Waste Treatment Centre at Tsing Yi, or other licensed facility, in accordance with the Waste Disposal (Chemical Waste) (General) Regulation.

To ensure proper management of chemical waste

Contractor

All works sites

Construction Phase

Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes

 

Waste Disposal (Chemical Waste) (General) Regulation

 

^

S8.6.27

General Refuse

-       General refuse should be stored in enclosed bins or compaction units separate from C&D material.  A reputable waste collector should be employed by the contractor to remove general refuse from the site, separately from C&D material.  Preferably an enclosed and covered area should be provided to reduce the occurrence of 'wind blown' light material.

To ensure proper management of general refuse

Contractor

All works sites

Construction Phase

Public Health and Municipal Services Ordinance (Cap. 132)

^

Impact on Cultural Heritage (Construction Phase)

S9.6.4

Dust and visual impacts 

-       Temporarily fenced off buffer zone with allowance for public access (minimum 1 m) should be provided;

-       The open yard in front of the temple should be kept as usual for annual Tin Hau festival;

-       Monitoring of vibration impacts should be conducted when the construction works are less than 100m from the temple.

To prevent dust and visual impacts

Contractors

Work areas

Construction Phase

EIAO; GCHIA; AMO

 

^

 

^

^

 

S9.6.4

Indirect vibration impact

-       Vibration level is suggest to be controlled within a peak particle velocity (ppv) limit of 5mm/s measured inside the historical buildings;

-       Monitoring of vibration should be carried out during construction phase.

-       Tilting and settlement monitoring should will be applied on the Cha Kwo Ling Tin Hau Temple as well.

-       A proposal with details for the mitigation measures and monitoring of impacts on built heritage shall be submitted to AMO for comments before commencement of work.

To prevent indirect vibration impact

Contractors

Work areas

Construction Phase

Vibration Limits on Heritage Buildings by CEDD; GCHIA; AMO.

 

^

 

^

^

 

^

 

Landscape and Visual Impact (Construction Phase)

Table 10.8.1

CM1 - Construction area and contractor’s temporary works areas to be minimised to avoid impacts on adjacent landscape.        

Avoid impact on adjacent landscape areas

CEDD (via Contractor)

General

Construction planning and during construction period

N/A

^

Table 10.8.1

CM2 - Reduction of construction period to practical minimum.

Minimise duration of impact

CEDD (via Contractor)

N/A

Construction planning

N/A

^

Table 10.8.1

CM3 - Topsoil, where the soil material meets acceptable criteria and where practical, to be stripped and stored for re-use in the construction of the soft landscape works. The Contract Specification shall include storage and reuse of topsoil as appropriate.

To allow re-use of topsoil

CEDD (via Contractor)

General

Site clearance

As per the Particular Specification

^

Table 10.8.1

CM4 - Existing trees at boundary of site and retained trees within site boundary to be carefully protected during construction. Detailed Tree Protection Specification shall be provided in the Contract Specification, under which the Contractor shall be required to submit, for approval, a detailed working method statement for the protection of trees prior to undertaking any works adjacent to all retained trees, including trees in contractor’s works areas. (Tree protection measures will be detailed at Tree Removal Application stage).

To minimize tree loss

CEDD (via Contractor)

As per approved Tree Removal Application(s)

Site clearance and throughout construction period

ETWB TC 3/2006 and as per tree protection measures in Particular Specification

* (11)

Table 10.8.1

CM5 - Trees unavoidably affected by the works shall be transplanted where practicable. Where possible, trees should be transplanted direct to permanent locations rather than temporary holding nurseries. A detailed tree transplanting specification shall be provided in the Contract Specification and sufficient time for preparation shall be allowed in the construction programme.

To maximize preservation of existing trees

CEDD (via Contractor)

As per approved Tree Removal Application(s)

Site clearance

ETWB TC 3/2006 and as per tree protection measures in Particular Specification

^

Table 10.8.1

CM6 - Advance screen planting of fast growing tree and shrub species to noise barriers and hoardings. Trees shall be capable of reaching a height >10m within 10 years.

To maximize screening of the works

CEDD (via Contractor)

At Lam Tin Interchange and edge of Road P2 landscape deck, TKO

Beginning of construction period

N/A

^

Table 10.8.1

CM7 - Hydroseeding or sheeting of soil stockpiles with visually unobtrusive material

To reduce visual intrusion

CEDD (via Contractor)

General

Throughout construction period

As per Particular Specification

N/A

Table 10.8.1

CM8 - Control of night-time lighting by hooding all lights and through minimisation of night working periods.

To reduce visual intrusion

CEDD (via Contractor)

General

Throughout construction period

N/A

^

Table 10.8.1

CM9 - Screening of works areas with hoardings with appropriate colours compatible with the surrounding area

Reduction of visual intrusion

CEDD (via Contractor)

Project site Boundary

Excretion of site hoarding

N/A

^

Table 10.8.1

CM10 - Avoidance of excessive height and bulk of site buildings and structure

Reduction of visual intrusion and integration with environment

CEDD (via Contractor)

Built structures

Design and construction stage

N/A

^

Table 10.8.1

CM11 - Limitation of run-off into freshwater streams, ponds and sea areas

Avoidance of contamination of water courses and water bodie

CEDD (via Contractor)

TKO reclamation, TKO  tunnel portal, Cha Kwo Ling roadworks

Throughout construction period

N/A

^

Table 10.8.1

CM12 - Minimise area of reclamation and design the edges sensitively to tie in with adjacent coastline characte

Minimise loss of Junk Bay and integration with existing coastlin

CEDD (via Contractor)

Temporary reclamation for barging points at TKO and Lam Tin and permanent reclamation for TKO Interchange slip roads and Road P2

Construction planning and reclamation stages

N/A

N/A

Landfill Gas Hazard (Design and Construction Phase)

S11.5.9

A Safety Officer, trained in the use of gas detection equipment and landfill gas-related hazards, should be present on site throughout the groundworks phase.  The Safety Officer should be provided with an intrinsically safe portable instrument, which is appropriately calibrated and able to measure the following gases in the ranges indicated below:

Methane        0-100% LEL and 0100% v/v

Carbon dioxide  0-100%

Oxygen         0-21%

 

Protect the workers from landfill gas hazards

Contractor

Project sites within the Sai Tso Wan Landfill Consultation Zone

Construction phase

EPD’s Landfill Gas Hazard Assessment Guidance Note

^

S11.5.10 S11.5.25

Safety Measures

-       For staff who work in, or have responsibility for at risk area, such as all excavation workers, supervisors and engineers working within the Consultation Zone, should receive appropriate training on working in areas susceptible to landfill gas, fire and explosion hazards.

-       An excavation procedure or code of practice to minimize landfill gas related risk should be devised and carried out.

-       No worker should be allowed to work alone at any time in or near to any excavation.  At least one other worker should be available to assist with a rescue if needed.

-       Smoking, naked flames and all other sources of ignition should be prohibited within 15m of any excavation or ground-level confined space.  No smoking and No naked flame notices should be posted prominently on the construction site and, if necessary, special areas should be designed for smoking. 

-       Welding, flame-cutting or other hot works should be confined to open areas at least 15m from any trench or excavation.

-       Welding, flame-cutting or other hot works may only be carried out in trenches or confined spaces when controlled by a permit to work procedure, properly authorized by the Safety Officer (or, in the case of small developments, other appropriately qualified person).

-       The permit to work procedure should set down clearly the requirements for continuous monitoring for methane, carbon dioxide and oxygen throughout the period during which the hot works are in progress.  The procedure should also require the presence of an appropriately qualified person, in attendance outside the 'confined area', who should be responsible for reviewing the gas measurements as they are made, and who should have executive responsibility for suspending the work in the event of unacceptable or hazardous conditions.  Only those workers who are appropriately trained and fully aware of the potentially hazardous conditions which may arise should be permitted to carry out hot works in confined areas.

-       Where there are any temporary site offices, or any other buildings located within the Sai Tso Wan Landfill Consultation Zone which have enclosed spaces with the capacity to accumulate landfill gas, then they should either be located in an area which has been proven to be free of landfill gas (by survey using portable gas detectors); or be raised clear of the ground by a minimum of 500mm.  This aims to create a clear void under the structure which is ventilated by natural air movement such that emission of gas from the ground are mixed and diluted by air.

-       Any electrical equipment, such as motors and extension cords, should be intrinsically safe. During piping assembly or conduiting construction, all valves/seals should be closed immediately after installation.  As construction progresses, all valves/seals should be closed to prevent the migration of gases through the pipeline/conduit.  All piping /conduiting should be capped at the end of each working day.

-       During construction, adequate fire extinguishing equipment, fire-resistant clothing and breathing apparatus (BA) sets should be made available on site.

-       Fire drills should be organized at not less than six monthly intervals.

-       The contractor should formulate a health and safety policy, standards and instructions for site personnel to follow.

-       All personnel who work on the site and all visitors to the site should be made aware of the possibility of ignition of gas in the vicinity of excavations.  Safety notices (in Chinese and English) should be posted at prominent position around the site warning danger of the potential hazards.

-       Service runs within the Consultation Zone should be designated as “special routes”; utilities companies should be informed of this and precautionary measures should be implemented.  Precautionary measures should include ensuring that staff members are aware of the potential hazards of working in confined spaces such as manholes and service chambers, and that appropriate monitoring procedures are in place to prevent hazards due to asphyxiating atmospheres in confined spaces.  Detailed guidance on entry into confined spaces is given in Code of Practice on Safety and Health at Work in Confined Spaces (Labour Department, Hong Kong).

-       Periodically during ground-works construction within the 250m Consultation Zone, the works area should be monitored for methane, carbon dioxide and oxygen using appropriately calibrated portable gas detection equipment.  The monitoring frequency and areas to be monitored should be set down prior to commencement of ground-works either by the Safety Officer or an approved and appropriately qualified person.

Protect the workers from landfill gas hazards

Contractor

Project sites within the Sai Tso Wan Landfill Consultation Zone

Construction phase

EPD’s Landfill Gas Hazard Assessment Guidance Note Labour Department’s Code of Practice for Safety and Health at Work in Confined Space

 

^

 

 

 

^

 

^

 

^

 

 

 

^

 

^

 

 

 

^

 

 

 

 

 

 

 

 

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^

 

^

^

 

^

 

 

 

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S11.5.26 - S11.5.31

Monitoring

l   Routine monitoring should be carried out in all excavations, manholes, chambers, relocation of monitoring wells and any other confined spaces that may have been created.  All measurements in excavations should be made with the extended monitoring tube located not more than 10 mm from the exposed ground surface.  Monitoring should be performed properly to make sure that the area is free of landfill gas before any man enters into the area.

l   For excavations deeper than 1m, measurements should be carried out:

-  at the ground surface before excavation commences;-

-  immediately before any worker enters the excavation;

-  at the beginning of each working day for the entire period the excavation remains open; and

-  periodically throughout the working day whilst workers are in the excavation.

l   For excavations between 300mm and 1m deep, measurements should be carried out:

- directly after the excavation has been completed; and

- periodically whilst the excavation remains open.

l   For excavations less than 300mm deep, monitoring may be omitted, at the discretion of the Safety Officer or other appropriately qualified person.

l   Depending on the results of the measurements, actions required will vary and should be set down by the Safety Officer or other appropriately qualified person.

l   The exact frequency of monitoring should be determined prior to the commencement of works, but should be at least once per day, and be carried out by a suitably qualified or qualified person before starting the work of the day.  Measurements shall be recorded and kept as a record of safe working conditions with copies of the site diary and submitted to the Engineer for approval. The Contractor may elect to carry out monitoring via an automated monitoring system.

Protect the workers from landfill gas hazards

Contractor

Project sites within the Sai Tso Wan Landfill Consultation Zone

Construction phase

EPD’s Landfill Gas Hazard Assessment Guidance Note

 

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^

 

 

 

 

 

^

 

 

^

 

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S11.5.32

The hazards from landfill gas during the construction stage within the Sai Tso Wan Landfill Consultation Zone should be minimized by suitable precautionary measures recommended in Chapter 8 of the Landfill Gas Hazard Assessment Guidance Note. 

construction stage within the Sai Tso Wan

Protect the workers from landfill gas hazards

Contractor

Project sites within the Sai Tso Wan Landfill Consultation Zone

Construction phase

EPD’s Landfill Gas Hazard Assessment Guidance Note

N/A

 


 

Table II - Observations/reminders/non-compliance made during Site Audit

 

Key:       *      Observation/reminder was made during site audit but improved/rectified by the contractor.

#      Observation/reminder was made during site audit but not yet improved/rectified by the contractor.

X     Non-compliance of mitigation measure

·      Non-compliance but rectified by the contractor

 

Status / Remark

EIA Ref.

Recommended Mitigation Measures

Contract No.

Work Sites

Details of Observation/Reminder

Air Quality Impact

* (1)

S3.8.1

 

S3.8.7

Watering eight times a day on active works areas, exposed areas and paved haul roads 

Dust suppression measures stipulated in the Air Pollution Control (Construction Dust) Regulation and good site practices:

-       Use of regular watering to reduce dust emissions from exposed site surfaces and unpaved roads, particularly during dry weather.

-       Use of frequent watering for particularly dusty construction areas and areas close to ASRs.

-       Only well-maintained plant should be operated on-site and plant should be serviced regularly to avoid emission of black smoke.

-       Every stock of more than 20 bags of cement or dry pulverised fuel ash (PFA) should be covered entirely by impervious sheeting or placed in an area sheltered on the top and the 3 sides.

NE/2015/01

Construction of Lam Tin Interchange

Air quality mitigation measures should be provided to slopes in TKO site and LTI for dust suppression.

NE/2015/01

Construction of Lam Tin Interchange

Dust curtain should be provided at Cha Kwo Ling barging point for dust suppression

NE/2015/01

Construction of Lam Tin Interchange

Appropriate NRMM labels should be displayed on PMEs in Portion IVC

NE/2015/01

Construction of Lam Tin Interchange

Water spraying should be provided to slopes in LTI for dust suppression.

NE/2015/01

Construction of Lam Tin Interchange

Water spraying should be provided to slopes in LTI for dust suppression.

NE/2015/01

Construction of TKO Portal

NRMM labels should be properly displayed on PMEs in Portion 6 in TKO site.

NE/2015/01

Construction of Lam Tin Interchange

Water spraying should be provided to slopes in LTI more frequently for dust suppression..

 

NE/2015/02

Construction of Road P2

Dust mitigation should be enhanced in Portion 4 and Work Area A.

NE/2015/02

Construction of Road P2

The Contractor was reminded to repair the tarpaulin cover of the cement mixing tank under the silo.

NE/2015/02

Construction of Road P2

Haul road at Portion 4 was observed dry. The Contractor should provide sufficient water spraying for dust suppression.

NE/2015/02

Construction of Road P2

The Contractor was reminded to repair the retractable tube of the drill rig in Portion 4 and ensure its integrity at all time.

NE/2015/01

Construction of TKO Portal

Bagged cement on haul road at Portion 6 in TKO site should be covered or sheltered on top and three sides.

 

NE/2015/02

Construction of Road P2

The Contractor was reminded to properly cover the bagged cement in Portion 7 to prevent dust emission.

# (1)

NE/2015/01

Construction of Lam Tin Interchange

Water sprinklers on Slope H should be provided to all breaking works for dust suppression.

NE/2015/02

Construction of Road P2

The Contractor was reminded to provide water spraying for unloading/ loading activity at Portion 5.

 

 

 

NE/2015/02

Construction of Road P2

The Contractor was reminded to maintain the construction vessels regularly to prevent black smoke emission.

 

 

 

NE/2015/02

Construction of Road P2

The Contractor was reminded to lower the level of stockpiles in Work Area A and cover them with impervious sheet.

 

 

 

NE/2017/02

Construction of Road P2/D4

Dusty materials should be removed to prevent dust generation.

Noise Impact (Construction Phase)

* (2)

Noise Mitigation Plan

Use of Temporary Noise Barriers or Full Enclosure for PME according to the approved Noise Mitigation Plan

NE/2015/01

Construction of Lam Tin Interchange

Acoustic materials wrapped on breaker head of PMEs on Slope H in LTI should be kept well maintained.

NE/2015/01

Construction of Lam Tin Interchange

The Contractor was reminded to place noise barriers next to breakers to reduce noise nuisance to nearby NSRs.

NE/2015/01

Construction of Lam Tin Interchange

Noise mitigation measures at Portion IVC next to Nga Lai House should be enhanced to minimize noise nuisance to NSRs nearby.

NE/2015/01

Construction of Lam Tin Interchange

The Contractor should ensure the noise barrier mounted on PME faces the nearby NSRs during works.

NE/2015/01

Construction of Lam Tin Interchange

Gaps between noise barriers near Slope H in LTI should be avoided.

NE/2015/01

Construction of Lam Tin Interchange

Acoustic materials should be placed next to breaking works on slopes in LTI

NE/2015/01

Construction of Lam Tin Interchange

Cantilever facing Nga Lai House should be provided on noise barriers in Portion IVC to reduce noise nuisance to NSRs

NE/2015/01

Construction of Lam Tin Interchange

Noise barriers on Slope H should be repaired and properly erected.

NE/2015/01

Construction of Lam Tin Interchange

Gaps between noise barriers in Portion IVC should be minimized to reduce noise nuisance to NSRs nearby.

NE/2015/01

Construction of Lam Tin Interchange

Acoustic materials on noise barrier on Slope H in LTI and wrapped on breaker in Portion IVC should be repaired or maintained.

NE/2015/02

Construction of Road P2

The Contractor was reminded to properly erect noise barriers for the drill rig in Portion 7 to reduce noise nuisance to nearby NSR.

# (2)

NE/2015/02

Construction of Road P2

To place the acoustic box properly for breaking work in Portion 4.

NE/2015/02

Construction of Road P2

The Contractor was reminded to erect an effective acoustic mat for the derrick barge at the unloading area in Portion 7 and properly erect the noise barrier near the entrance of Portion 7.

NE/2015/02

Construction of Road P2

The Contractor was reminded to replace NRMM labels when needed.

Water Quality Impact (Construction Phase)

* (3)

S5.8.3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Other good site practices should be undertaken during filling operations include:

-       all marine works should adopt the environmental friendly construction methods as far as practically possible including the use of cofferdams to cover the construction area to separate the construction works from the sea;

-       floating single silt curtain shall be employed for all marine works;

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NE/2015/01

Construction of TKO Portal

Silt curtain should enclose the entire area of marine works at TKO site to prevent effluent discharge.

NE/2015/01

Construction of TKO Portal

Gaps between silt curtains at TKO site should be avoided.

NE/2015/01

Construction of TKO Portal

Gap was found between the two units of the silt curtain. The contractor was reminded to repair the silt curtain and ensure that the geotextile is extended from the sea surface to the seabed

NE/2015/01

Construction of TKO Portal

Gaps between silt curtains in TKO site should be avoided.

NE/2015/02

Construction of Road P2

The Contractor was reminded to keep the deck of hopper barge free of excess material before the vessel is moved.

NE/2015/02

Construction of Road P2

Minor gap was found between 2 units of silt curtain near Type 1 cofferdam. The Contractor was reminded to carry out maintenance regularly to ensure integrity of silt curtain at all time. 

NE/2015/02

Construction of Road P2

The Contractor was reminded to remove the excess material from the deck of barge when vessel is moved

NE/2015/02

Construction of Road P2

Silty water was found accumulated at the boundary of Portion 7. The Contractor should clear and treat the water properly.

NE/2015/02

Construction of Road P2

The Contractor was reminded to ensure the hopper barges are filled to a level that marine sediments would not spill over during loading or transportation.

NE/2015/02

Construction of Road P2

Water was found slightly opaque outside the frame type silt curtain. The Contractor was reminded to ensure the integrity of frame-type silt curtain at all time.

NE/2015/02

Construction of Road P2

Silt curtains near the double water gate are observed damaged. The Contractor should maintain the silt curtains properly and ensure the geotextile is extended to seabed.

# (3)

NE/2015/01

Construction of TKO Portal

Silt curtain near marine platform in TKO site should be maintained to prevent untreated discharge.

NE/2015/02

Construction of Road P2

To repair the damaged silt curtain at the double water gate and deploy silt curtains around the cofferdam properly without gaps.

NE/2015/02

Construction of Road P2

The Contractor was reminded to clear the sediment at the unloading area at Portion 7 regularly.

* (4)

S5.8.7

Construction site runoff and drainage should be prevented or minimised in accordance with the guidelines stipulated in the EPD's Practice Note for Professional Persons, Construction Site Drainage (ProPECC PN 1/94). Good housekeeping and stormwater best management practices, as detailed in below, should be implemented to ensure that all construction runoff complies with WPCO standards and no unacceptable impact on the WSRs arises due to construction of the TKO-LT Tunnel.  All discharges from the construction site should be controlled to comply with the standards for effluents discharged into the corresponding WCZ under the TM-DSS.

NE/2015/02

Construction of Road P2

The Contractor was reminded to remove the accumulated silt from the drainage surround the outside of Work Area A more frequently.

#(5)

S5.8.11

Sedimentation tanks of sufficient capacity, constructed from pre-formed individual cells of approximately 6 to 8m3 capacity, are recommended as a general mitigation measure which can be used for settling surface runoff prior to disposal.  The system capacity is flexible and able to handle multiple inputs from a variety of sources and particularly suited to applications where the influent is pumped.

NE/2015/03

Construction of Northern Footbridge

Water leakage was found in the sedimentation tank in West Pier. The Contractor was reminded to rectify immediately and check the performance regularly

* (6)

 

S5.8.42

Vehicle and plant servicing areas, vehicle wash bays and lubrication bays should as far as possible be located within roofed areas. The drainage in these covered areas should be connected to foul sewers via a petrol interceptor. Oil leakage or spillage should be contained and cleaned up immediately. Waste oil should be collected and stored for recycling or disposal in accordance with the Waste Disposal Ordinance.

NE/2015/01

NE/2015/02

Construction of TKO Portal

Oil stain on the ground should be removed near the excavator at TKO site

NE/2015/02

Construction of Road P2

PME in Portion 6 in TKO site should be maintained regularly to avoid oil leakage.

NE/2015/02

Construction of Road P2

Oil stain was found under an idling drill rig in Portion 7

NE/2015/02

Construction of Road P2

Oil stain was found under the drill rig in Portion 7. The Contractor was reminded to carry out maintenance as necessary

NE/2015/02

Construction of Road P2

Oil stain was found on the paved ground in Portion 4. The Contractor was reminded to clear the oil stain properly

NE/2015/02

Construction of Road P2

Oil stain was found on the paved ground in Portion 4. The Contractor was reminded to clear the oil stain properly

NE/2015/02

Construction of Road P2

To clear the oil stain found under the pre-boring machine in Portion 5.

# (6)

NE/2015/02

Construction of Road P2

The Contractor was reminded to properly clear the oil stain at the double water gate and Portion 4.

* (7)

 

 

S5.8.45

Any service shop and 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 leakage and spillage should only be undertaken within the areas appropriately equipped to control these discharges.

NE/2015/01

NE/2015/02

Construction of TKO Portal

Drip tray should be provided to chemical containers at Portion 6 in TKO site

NE/2015/01

NE/2015/02

Construction of TKO Portal

Drip tray should be provided to chemical containers at Portion IVC.

NE/2015/01

NE/2015/02

Construction of TKO Portal

Drip tray should be provided to chemical containers on marine platform in TKO site

NE/2015/01

NE/2015/02

Construction of TKO Portal

Drip tray should be provided to chemical containers in Portion 6 in TKO site

NE/2015/01

NE/2015/02

Construction of TKO Portal

Drip tray should be provided to chemical containers in WA1.

NE/2015/03

Construction of Northern Footbridge

Stagnant water was found in the drip tray in West Pier. The Contractor was reminded to check and clean it up regularly

NE/2015/01

Construction of TKO Portal

Drip tray should be provided to chemical containers at Portion 6 in TKO site.

Ecological Impact

* (8)

S6.8.5

Standard Good Site Practice

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

-     General drainage arrangements should include sediment and oil traps to collect and control construction site run-off.

-     Waste skips should be provided to collect general refuse and construction wastes. The wastes should be properly disposed off-site in a timely manner.

NE/2017/02

Construction of Road P2/D4

Dusty materials should be removed to prevent dust generation.

 

Waste Management (Construction Phase)

* (9)

S8.6.3 /

S 8.6.8

Good Site Practices and Waste Reduction Measures

-       Provision of sufficient waste disposal points and regular collection of waste;

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

Storage, Collection and Transportation of Waste (con’t)

Remove waste in timely manner;

NE/2015/02

Construction of Road P2

Accumulation of waste should be avoided and housekeeping should be enhanced in Portion 7.

NE/2015/01

Construction of TKO Portal

General refuse on access road in TKO site should be removed

NE/2015/01

Construction of TKO Portal

General refuse at TKO site should be properly cleared.

NE/2017/02

Construction of P2/D4

General refuse should be collected and disposed regularly.

NE/2015/03

Construction of Northern Footbridge

A proper label is needed for the “Tree Protection Zone” in West Pier.