Table 12.1    Summary Table for Site Activities, Potential Environmental Impacts and Recommended Mitigation Measures in the Coming Months

Contract No.

Major Site Activities
 (August to
October 2025)

Location/ Working Period

Potential Environmental Impact

Recommended Mitigation Measures

ND/2019/01

(a)      Excavation / Backfilling

Portion 1c, 6a, 7, 8a, 9b

- Construction Dust impact

- Noise Impact (Construction Phase)

- Water Quality Impact (Construction Phase)

- Waste Management (Construction Waste)

 

Air

-              Watering on exposed earth and haul road.

-              Cover the stockpiles or dusty materials.

-              Deploy water bowsers to water the haul road.

-              Deploy mist-cannon on site

-              Provide shelter with top and 3-sides for cement production activities.

-              Cover the Arsenic-containing soil.

-              Store the bulk cement in enclosed silo tank for soil treatment.

-              Close the mechanical cover of the vehicles used for transporting dusty materials.

-              Establish vehicle wheel washing facilities at vehicle exit points.

-              Speed control of site vehicles.

Noise

-              Regular inspect of construction plants in good condition.

-              Provide temporary noise screens if necessary.

-              Use of Quiet plants (QPME) and working methods if possible.

-              Sequencing operation of construction plants where practicable.

-              Shut down the machines and plant if not in use.

-              Only well-maintained plant to be operated on-site

-              Mobile plant to be sited as far away from NSRs as possible practicable.

-              Conduct noise monitoring regularly.

-              Erect silent-up noise barrier at portion 6b.

Water

-              Set up wastewater treatment system (AquaSed) on site

-              Erect soil bund / temporary drain to divert /collect surface runoff.

-              Maintain the drainage and wastewater treatment facilities.

Waste / Chemical Management

-              Sort out demolition debris and excavated materials from demolition works to recover reusable / recyclable portions

-              Provide recycling bins on site, encourage reuse and recycle as much as possible.

-              Provide drip trays for chemical containers.

-              Chemical spill kit available on site.

-              Chemical waste cabinet available on site.

-              Chemical wastes to be stored in appropriate containers and collected by a licensed chemical waste collector.

-              Delivery of yard waste to tree shredding facility for upcycling.

(b)      Site formation

Portion 1c, 2, 5

(c)       Planting / Metal works / RC structure works / E&M works

Portion 8a

(d)      Construction of subway

Portion 2

(e)       Sewage Works

Portion 1c, 7

(f)       RC Construction of fresh water service reservoir

Portion 8a

(g)      District Cooling System

Portion 6a, 9b

(h)      Operation of HAC treatment facility / HAC soil treatment

Portion 3, 6b

(i)        Drainage works / watermains works

Portion 1a, 1c, 2, 5, 6a, 7, 8a, 8b, 9b, 10b, 11b

(j)        Road works

Portion 1c, 2, 6a, 7, 8a, 9b

(k)      Soil nail / Slope works

Portion 1a, 2, 6a, 8a

(l)       Grouting, ground treatment

Portion 8b

(m)    Road lighting works

Portion 6a

(n)      Sheet piling/ ELS

Portion 1a, 1c, 8b, 9b

(o)      Stockpile of soil

Portion 13

ND/2019/02

(a)        Pipe Jacking

Portions 2, 4

Air, Noise, Waste

-              Dusty works should be spray water. Idle stockpile or slop should be covered by Tarpaulin sheet properly.

-              Wheel washing should be carried out at every exit.

-              Plants should be well maintained to prevent dark smoke and oil leakage. Idle plant should be turned off.

-              Drip tray should be provided for all chemical and stationary plants.

-              No construction works shall be carried out in restricted hours (7:00 pm to 7:00 am) unless CNP is obtained.

-              Erect noise screen along site boundary.

-              Waste should be sorted and dispose according to the Waste Management Plan

-              No direct discharge of wastewater into storm drains is allowed. Wastewater must be de-silted before discharged in accordance with the water discharge license.

-              Dull green barrier and ecological measures should be implemented according to the Ecological protection plan.

(b)       Backfilling

Portions 4

Air, Noise, Waste

(c)        Concreting

Portions 3, 11

Air, Noise, Water, Waste, Ecology

(d)       Bedding & Pipe Laying

Portion 5, 6

Air, Noise, Water, Waste, Ecology

(e)        ELS

Portions 4, 5, 6

Air, Noise, Water, Waste, Ecology

(f)        Grouting

Portion 6, 11

Air, Noise, Water

(g)       Cut and Fill of Slope

Portion 5, 6

Air, Noise, Water, Waste

(h)       Sheet pile installation

Portion 5

Air, Noise, Water, Waste

ND/2019/03

N/A

N/A

N/A

N/A

ND/2019/04

(a)        Rebar Fixing, formwork erection and scaffolding erection

Bridge F, A1, A2, A3, Portion J, K, H, A, B

-     Air, Noise, Waste

-              Dusty works should be sprayed with water or stockpile should be covered by tarpaulin properly.

-              Plants should have maintenance to prevent dark smoke and oil leakage. Idle plant should be turned off.

-              Drip tray should be provided for all chemical and stationary plants.

-              No construction works shall be carried out in restricted hours (7:00 pm to 7:00 am) unless CNP is granted.

-              Waste should be sorted and disposed according to Waste Management Plan.

-              No direct discharge of wastewater into storm water drains is allowed. Wastewater must be desilted before discharging according to water discharge license.

(b)       Concreting

Portion F, B, N, K

-     Air, Noise, Waste

(c)        Grouting

Bridge F, A1, A2, A3 and Portion J, K, H

-     Air, Noise, Water, Waste

(d)       Back filling

Bridge A1, Portion F

-     Air, Noise, Waste

(e)        Excavation & ELS

Portion A, B, J, H, K

-     Air, Noise, Waste

(f)        Road works

Portion A, B, H, K

-     Air, Noise, Waste

(g)       MIC

Portion J

-     Air, Noise, Waste

(h)       Sheet piling

NIL

-     NIL

(i)         UU diversion

Portion J and K

-     Air, Noise, Waste

ND/2019/05

(a)        ELS & Pile Cap Construction

NB69 Bay 2~8

NB110 Bay 6~7

-     Construction Dust Impact

-     Noise Impact

-     Water Quality Impact (Construction Phase)

-     Waste Management  (Construction Waste)

-     Landscape and Visual

-     Cultural Heritage

Regular watering on exposed worksites and haul road.

-              Stockpiling area should be provided with covers and water spraying system.

-              Only well maintained plant to be operated on site.

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

-              mobile plant to be sited as far away from NSRs as possible practicable.

-              All open stockpiles of construction materials of more than 50m3 to be cove red with tarpaulin.

-              Manholes to be adequately covered and temporarily sealed so as to prevent silt, construction materials or debris being washed into the drainage system.

-              All vehicles and plant to be cleaned before leaving a construction site to ensure no earth, mud, debris and the like is deposited by them on roads.

-              Segregate and store different types of waste in different containers, skip or stockpiles to enhance reuse or recycling of materials and their proper disposal.

-              Sort out demolition debris and ex cavated materials from demolition works to recover reusable/recyclable portions.

-              Provide training to workers on appropriate waste management procedures, including waste reduction, reuse and recycling.

-              To adopt other good site practice, such as arrangements for collection and effective disposal to an appropriate facility, of all wastes generated at the site and regular cleaning and maintenance programme for drainage.

-              Chemical wastes to be stored in appropriate containers and collected by a licensed chemical waste Contractor. Chemical wastes (e.g. spent lubricant oil) should be recycled at an appropriate facility as far as possible, while the chemical waste that ca nnot be recycled should be disposed of at either the Chemical Waste Treatment Centre, or another licensed facility, in accordance with the Waste Disposal (Chemical Waste) (General) Regulation.

-              Conducting Construction Vibration Monitoring

-              Tree Protection & Preservation Exiting trees to be retained within the Project Site should be carefully protected during construction. In particular OVTs will be preserved according to ETWB Technical Circular (Works) No. 29/2004.

-              Tree Transplantation Trees unavoidably affected by the Project works should be transplanted where practical. Trees should be transplanted straight to their final receptor site and not held in a temporary nursery as far as possible.

-              Erect 2m high dull green site boundary fence.

(b)       Cap Construction

E3-04a, E3-04b, E4-01 and E4-02

(c)        Cross head construction

B2-01, B2-02 and B2-03

(d)       Pier / Pier head Construction

D2-01 and E305M

(e)        Fabrication for segment

C2, C1, D1, D2, E1, E4

(f)        Form Traveler

E3-01 construction 3rd to 6th pair

E2-02 construction 14th pair & dismantling of FT1

D2-02 construction 6th to 8th pair

D2-03 construction 2nd pair to 4th pair

E2-01 erection of 5th set of form traveler.

(g)       Segment Erection by Launching Girder & Crane

Bridges C3, C2

(h)       SOP construction (precast & in-situ cast in type)

D2-01

(i)         Road construction

TWSRW, TWSRE

(j)         Road works

Jockey Club Rd, TWSRW

(k)       Base slab construction

NB109 – bay 11~12

(l)         Tree Works

All works areas

(m)     Drainage works

On Kui Street

ND/2019/06

N/A

N/A

N/A

N/A

ND/2019/07

(a)        Road works

Portion 1, 3, 4

-     Construction Dust Impact

-     Noise Impact

-     Water Quality Impact (Construction Phase)

-     Waste Management (Construction Waste)

-     Landscape and Visual

-              Regular watering on exposed worksites and haul road.

-              Stockpiling area should be provided with covers and water spraying system.

-              Only well-maintained plant to be operated on-site.

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

-              mobile plant to be sited as far away from NSRs as possible practicable.

-              All open stockpiles of construction materials of more than 50m3 to be covered with tarpaulin.

-              Manholes to be adequately covered and temporarily sealed so as to prevent silt, construction materials or debris being washed into the drainage system.

-              All vehicles and plant to be cleaned before leaving a construction site to ensure no earth, mud, debris and the like is deposited by them on roads.

-              Segregate and store different types of waste in different containers, skip or stockpiles to enhance reuse or recycling of materials and their proper disposal.

-              Sort out demolition debris and excavated materials from demolition works to recover reusable/recyclable portions.

-              Provide training to workers on appropriate waste management procedures, including waste reduction, reuse and recycling.

-              To adopt other good site practice, such as arrangements for collection and effective disposal to an appropriate facility, of all wastes generated at the site and regular cleaning and maintenance programme for drainage.

-              Chemical wastes to be stored in appropriate containers and collected by a licensed chemical waste Contractor. Chemical wastes (e.g. spent lubricant oil) should be recycled at an appropriate facility as far as possible, while the chemical waste that cannot be recycled should be disposed of at either the Chemical Waste Treatment Centre, or another licensed facility, in accordance with the Waste Disposal (Chemical Waste) (General) Regulation.

-              Tree Protection & Preservation – Exiting trees to be retained within the Project Site should be carefully protected during construction. In particular OVTs will be preserved according to ETWB Technical Circular (Works) No. 29/2004.

-              Tree Transplantation – Trees unavoidably affected by the Project works should be transplanted where practical. Trees should be transplanted straight to their final receptor site and not held in a temporary nursery as far as possible.

-              Erect 2m high dull green site boundary fence.

-              Light Control – Construction day and night time lighting should be controlled to minimize glare impact to adjacent VSRs during the Construction phase.

(b)       C&D waste disposal

Portion 2, 4

(c)        Filling works

Portions 2

(d)       Construction of site haul road

Portions 4

(e)        Drainage Works

Portion 1, 2, 3, 4

(f)        Sewerage works

Portion 3, 4

(g)       Construction of Noise Barrier

Portion 4

(h)       Waterworks

Portion 1, 2, 3, 4