12           FUTURE KEY ISSUES

Contract No.

Major Site Activities (June to July 2022)

Location/ Working Period

Potential Environmental Impact

Recommended Mitigation Measures

ND/2019/01

(a)       Site clearance

Portion 1a, 1b, 1e, 2, 3, 5, 6a, 7

- 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

-              Install sprinklers system for dust suppression.

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

-              Entirely 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.

-              Erect solid dull green hoarding.

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 bin on site, encourage reuse and recycle as much as possible.

-              Provide drip tray 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)      GI works

Portion 1b, 9b

(c)       Excavation

Portion 1b, 3, 5, 6a, 7, 8a, 8b,9b,9c,10a, 10b

(d)      Construction of retaining wall

Portion 6a, 8a

(e)       Site Formation

Portion 2

(f)       Demolition of existing structure

Portion 1a

(g)      Construction of temporary site haul road

Portion 2, 5, 10a

(h)      Operation of HAC treatment facility

Portion 6b

(i)        Tree felling

Portion 1a, 1e, 2

(j)        Drainage Works

Portion 1b, 5, 6a, 7, 8a, 9b, 10a, 10b

(k)      Grouting

Portion 8b

(l)        Construction of reservoir

Portion 8a

(m)    Sheet piling / ELS

Portion 1b, 5, 6a, 7, 8b, 9b, 10a, 10b

ND/2019/02

(a)        Pipe Jacking

Portions 1 & 3

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.

-              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

Portion 3

Air, Noise, Waste

(c)        Concreting

Portions 3, 9 & 10

Air, Noise, Water, Waste, Ecology

(d)       Bedding & Pipe Laying

Portion 3

Air, Noise, Water, Waste, Ecology

(e)        ELS

Portions 3 & 7

Air, Noise, Water, Waste, Ecology

(f)        Sheet Pile Installation

Portions 3, 4 & 7

Air, Noise, Water, Waste

(g)       Cut and Fill of Slope

Portion 7

Air, Noise, Water, Waste

ND/2019/03

(a)        Excavation & ELS

Portion 1, 1A, 2, 3, 4, 4A, 4B, 5 and 5A

-     Waste

-     Air pollution

-     Noise pollution

-              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)       Site Clearance

Section 7, 8 and 9

-     Waste

-     Air pollution

-     Noise pollution

(c)        Tree Felling

Section 6, 7, 8 and 9

-     Waste

-     Air pollution

Noise pollution

ND/2019/04

(a)        Sheet piling

Bridge A2, A3, Portion K

-     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)       Bored piling

Bridge A1, A2, A3

-     Air, Noise, Water, Waste

(c)        Predrill

Bridge A3, Portion K

-     Air, Noise, Water, Waste

(d)       Excavation and ELS

Portion H, A2, A3

-     Air, Noise, Waste

(e)        Site clearance

Portion K

-     Air, Noise, Waste

(f)        Tree felling

Portion Q, R

-     Air, Noise, Waste

ND/2019/05

(a)        Pre drilling for bored piles

B1 & B2(Portion II), C1(Portion II) & C1 03

-     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 covered with tarpaulin.

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

-              All vehicles and plant to be cleaned before leaving a construction site to ensure noearth, 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 arrangementsfor 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.

-              Conducting Construction Vibration Monitoring

-              Tree Protection & Preservation –Exiting trees to be retained within the Project Site should be carefully protectedduring 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 transplantedstraight 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)       Bored piling

B1(Portion I), B1&B2(Portion II), C1(Portion II), C1-02b, C103, C2-02, C2-03a, C2-03b, C3-02, C3-03a, C3-04a, D2-01, E2-01.

(c)        Pipe Pilling

D2-03

(d)       Interface Coring works

D2-02, B1-01 P8, B1-02b P2, C1-04a P1, C2-01 P5, C2-02 P1, C2-02

P3 & C2-02 P6

(e)        ELS & Pile Cap Construction

C1-04, C3-04b, D1-01, D1-02, D1-03, D1-04, E1-01, E1-02, E1-03 &

E1-04, E2-03 E3-01, E3-03, D2-02

(f)        Bailey bridge construction Portal Beam

C4-01

(g)       Footing Construction

C4-02

(h)       Utilities Diversion/construction Works and Permanent Road Works

Venton Area

Portion 11, Portion 13, Portion 17 and 18

(i)         Pier/ Column Construction

C3-03b, C4-03, C4-04aM, C4-04bM, D1-01, E1-01, E1-02, E1-03& E1-04

(j)         Haul road construction

B2-03 to C1-02a at Portion II

(k)       Launching Girder & Form Traveler Fabrication

CTC Storage Yard

(l)         Slope works

RW06, FS04

(m)     Demolition

HD Warehouse

ND/2019/06

N/A

N/A

N/A

N/A

ND/2019/07

(a)        Site clearance

Portion 4, 5

-     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)       Erection of site hoarding

Portion 3, 4

(c)        C&D waste disposal

Portion 1, 2, 4, 5

(d)       Ground investigation works

Portion 4

(e)        Construction of box culvert

Portion 2

(f)        Filing works

Portion 1, 2, 4

(g)       Tree felling/ disposal of yard waste

Portion 4, 5

(h)       Construction of site haul road

Portion 4, 5

(i)         Drainage works

Portion 1, 3, 4, 5

(j)         Sewage works

Portion 1, 3, 4, 5

(k)       Construction of Noise Barrier

Portion 5

(l)         Watermains

Portion 1