12           FUTURE KEY ISSUES

Contract No.

Major Site Activities (July and August 2021)

Location/ Working Period

Potential Environmental Impact

Recommended Mitigation Measures

ND/2019/01

(a) Site clearance

Portion 1f, 2, 3, 5, 6a, 7, 10b

- Construction Dust impact

- Noise Impact (Construction Phase)

- Water Quality Impact (Construction Phase)

- Waste Management (Construction Waste)

Air

-              Regular watering on exposed worksites and haul road.

-              Cover the stockpiles or dusty materials.

-              Deploy water browsers to water the haul road.

-              Deploy mist-cannon on site

-              Install sprinkler 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 Solidification / Stabilization 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.

-              Shotcrete on exposed slope.

-              Erect solid site 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 and 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 Y-Park for reuse or other agreed alternative site (Tung Wah camp site).

(b) GI works

Portion 2, 8b

(c) Excavation

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

(d) Construction of retaining wall

Portion 5, 6a, 8a

(e) Soil nailing / shotcrete

Portion 6a, 8a

(f)  Demolition of existing structure

Portion 8a

(g) Construction of temporary site haul road

Portion2, 6a, 1f

(h) Pilot trial for arsenic soil treatment works

Portion 6b

(i)  Tree felling

Portion 2, 3, 5, 7

(j)  Sheetpiling

Portion 9b, 10a

ND/2019/02

(a)        Pre-bored Socketed H-pile

Portion 7, 9, 10

Air, Noise, Water, Waste, Ecology

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

-              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)       Hoarding erection

Portion 10

Air, Noise, Waste

(c)        Tree Felling

Portion 7

Air, Noise, Waste

(d)       ELS

Portion 1, 9

Air, Noise, Water, Waste, Ecology

ND/2019/03

(a)        Excavation of irrigation channel

Long Valley

-     C&D waste

-     Air pollution

-     Noise pollution

-              Watering exposed earth regularly

-              Cover C&D material by tarpaulin

-              Adopt QPME for excavation

(b)       Excavation of trench in Yin Kong Road

Portion 1 and Portion 1A

-     C&D waste

-     Air pollution

-     Noise pollution

-     Water pollution

-              Watering exposed earth regularly

-              Cover C&D material by tarpaulin

-              Noise barrier for screening from source of noise

-              Wastewater will be treated before discharging to channel

(c)        Demolition of existing structure

Long Valley

-     C&D material

-     Air Pollution

-              Cover C&D material by tarpaulin

-              Watering while demolish the structure

(d)       Construction works of storage shed and Type 2 Storage House

Long Valley

-     C&D material

-     Air Pollution

-              Watering exposed earth regularly

-              Cover C&D material by tarpaulin

(e)        Asbestos Removal in Long Valley

Long Valley

-     Air Pollution

-              Removing the asbestos containing material according to requirement of COP

ND/2019/04

(a)        Socket H-piling

Portion N

-     Air, Noise, Water, 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 A2, F

-     Air, Noise, Water, Waste

(c)        Excavation

Bridge F

-     Air, Noise, Waste

(d)       Site clearance

Portion A, B

-     Air, Noise, Waste

(e)        Tree felling

Portion A

-     Air, Noise, Waste

ND/2019/05

(a)        Ground investigation works

FLN3-DH016, ABH02, ABH04, D39(P), ABH10

-     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 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

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

-              Erect 2m high dull green site boundary fence.

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

(b)       Pre drilling for bored piles

B1 (Portion I), C2-01, C2-02, E2-01, B1 (Portion II), B2 (Portion II), C1-01 & C1-02 (Portion II), C3-02

(c)        Bored piling

C3-03b, C3-04b, C2-04B, D1-03, E1-03, D1-04, E1-04, E2-03, C3-01b, C2-01, B1(Portion 1), C3-04b, E3-01, C3-01a, C2-03b, C3-03a, C3-04a, D1-02, E1-02,

E2-01, D2-01.

(d)       Soil Nail

Jockey Club Road

(e)        Pile Cap Construction

E2-01, C4-03, C4-04, E3-03, D1-01, E1-01, HKY-P02 pile cap & HKY-AB ELS. C4-01a and C4-01b

(f)        Footing Construction

HKYFB Cap P-02 and Cap AB

(g)       Site Formation

Portion XI, XII, TWSRW

(h)       Utitilies Diversion Works and Permanent Road Works

TWSRW

(i)         Tree work

TWSRW, Jockey Club Road

(j)         TTA

Jockey Club Road

(k)       Drainage & Water Mains construction

Box culvert BC5, TWSRE

(l)         UU diversion

Tai Wo Service Road West

(m)     Gas main diversion

Jockey Club Road

(n)       Road works for temporary road diversion

D2-03, Portion XI

(o)       Retaining wall construction

FW04, FW05, FW06, FW52

(p)       Slope construction

C363, FS04, Jockey Club Road

(q)       Footbridge staircase demolition

Ho Ka Yuen Footbridge

ND/2019/06

(a)        Construction of finishing works and E&M works for the Management Office Building (MOB)

Portion 4

-     Noise pollution

-     Water pollution

-              Adopt noise barrier in screening noise

-              Wastewater generated after wheel washing of

vehicles should be treated properly before discharge

(b)       Construction of retaining wall FW21 and ramp structure

Portion 3

-     Water pollution

-              Wastewater generated after wheel washing of vehicles should be treated properly before disposal

-              Provide sand bags for prevent polluted water discharge off site without wastewater treatment

(c)        Erection of the steel members of steel canopy; Construction of ground slab of the market stall area and concrete carriageway; Construction of underground utilities in the final stage market

Portion 3

-     C&D waste

-     Air pollution

-     Noise pollution

-     Water pollution

-              Cover C&D waste by impervious sheeting

-              Spray with water to work area before, during and

after the work

-              Adopt QPME for excavator

-              Wastewater generated after wheel washing of vehicles should be treated properly before disposal

(d)       Installation and Construction of sheet piles for ELS for footings of additional carriageway steel cover

Portion 3

-     C&D waste

-     Air pollution

-     Noise pollution

-     Water pollution

-              Cover C&D waste by impervious sheeting

-              Spray with water to work area before, during and

after the work

-              Adopt QPME for excavator

-              Wastewater generated after wheel washing of vehicles should be treated properly before disposal

ND/2019/07

(a)        Site clearance

Portion 1, Portion 2

-     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 s praying 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 – Existing 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 1

(c)        C&D waste disposal

Portion 1, Portion 2

(d)       Ground investigation works

Portion 1

(e)        Construction of box culvert

Portion 2

(f)        Filing works

Portion 2

(g)       Tree felling/ disposal of yard waste

Portion 1, Portion 2

(h)       Construction of site haul road

Portion 1

(i)         Trial pit

Ma Sik Road

(j)         Demolition of villager’s houses

Portion 1, Portion 2