12 FUTURE KEY ISSUES

Key Issues in the Coming Three Months

12.1 The major site activities, potential environmental impacts and recommended mitigation measures for the coming three months are shown in Table 12.1.

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

Contract No.	Major Site Activities (June to August 2024)	Location/ Working Period	Potential Environmental Impact	Recommended Mitigation Measures
ND/2019/01	(a) Site clearance / tree felling	Portion 13	- 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) Stockpile of soil	NIL
	(c) Excavation / Backfilling	Portion 6a, 7, 8a, 9b, 11b
	(d) Slope works	Portion 3
	(e) Construction of noise barrier	Portion 1c
	(f) Site Formation	Portion 1c, 2, 3, 5, 13
	(g) Removal of existing structure	Portion 13
	(h) Construction of subway	Portion 2
	(i) Operation of HAC treatment facility	Portion 6b
	(j) Drainage works / watermains works	Portion 1a, 2, 3, 6a, 7, 8a, 8b, 9b, 11b
	(k) Road Construction	Portion 2, 7
	(l) Trenchless	Portion 8b
	(m) Construction of reservoir/receiving pit	Portions 8a
	(n) Ground Treatment	Portions 8b
	(o) Erection of hoarding	NIL
	(p) Sheet piling / ELS & pipe pile / Shoring	Portion 1a, 2, 9b
	(q) District Cooling System	Portion 6a, 9b
	(r) Sewage works	NIL
	(s) Pipe jacking	Portion 5
ND/2019/02	(a) Pipe Jacking	Portions 1, 2, 4, 5	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	Portion 10	Air, Noise, Waste
	(c) Concreting	Portions 4, 7, 8, 10	Air, Noise, Water, Waste, Ecology
	(d) Bedding & Pipe Laying	Portion 5	Air, Noise, Water, Waste, Ecology
	(e) ELS	Portions 4, 5, 8	Air, Noise, Water, Waste, Ecology
	(f) Sheet Pile Removal	NIL	NIL
	(g) Cut and Fill of Slope	Portion 4, 5	Air, Noise, Water, Waste
	(h) Sheet pile installation	Portion 5, 6, 7	Air, Noise, Water, Waste
ND/2019/03	(a) Excavation & ELS	Portion 1, 1A, 2, 3, 4, 4A, 4B, 5, 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	Sections 7, 8 and 9	- Waste - Air pollution - Noise pollution
	(c) Tree Felling	Sections 6, 7, 8 and 9	- Waste - Air pollution - Noise pollution
ND/2019/04	(a) Rebar Fixing, formwork erection and scaffolding erection	Bridge F, A1, A2, A3, Portion J, K, H	- 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) Pile cap	Bridge A1, A3 and Portion J, K	- Air, Noise, Water, Waste
	(c) Grouting	Bridge F, A1, A2, A3 and Portion J, K, H	- Air, Noise, Water, Waste
	(d) Sheet piling removal	Bridge A1, Portion F	- Air, Noise, Water, Waste
	(e) Excavation & ELS	Portion J, H, K, X, S, F03, Bridge A1, A2, A3, F01	- Air, Noise, Waste
	(f) Road works	Portion B, J, H, U and VY	- Air, Noise, Waste
	(g) Pre-drilling	NIL	- NIL
	(h) Sheet piling	Portion B	- Air, Noise, Waste
	(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 3^rd to 6^th pair E2-02 construction 14^th pair & dismantling of FT1 D2-02 construction 6^th to 8^th pair D2-03 construction 2^nd pair to 4^th pair E2-01 erection of 5^th 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 ¡V 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, 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 ¡V 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 ¡V 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 ¡V 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 1, 2, 4
	(c) Filling works	Portions 2, 4
	(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 5
	(h) Waterworks	Portion 1, 2, 4

12.2 The major site activities in coming three months are shown in Table IV.

Monitoring Schedule for the Next Month

12.3 The tentative environmental monitoring schedule for the next month is shown in Appendix D.

Construction Programme for the Next Month

12.4 A tentative construction programme is provided in Appendix A.