12.1
The major site activities, potential
environmental impacts and recommended mitigation measures for the coming three months are shown in Table 12.1.
12.2
The major site activities in coming three months are shown in Table IV.
12.3 The tentative environmental
monitoring schedule for the
next month is shown in Appendix D.
12.4 A tentative construction programme is provided in Appendix A.
Table 12.1 Summary Table for Site Activities,
Potential Environmental Impacts and Recommended Mitigation Measures in the Coming Months
|
Contract No. |
Major Site Activities (October to |
Location/ Working Period |
Potential Environmental Impact |
Recommended Mitigation Measures |
|
ND/2019/01 |
(a)
Site
clearance / tree felling |
Portions
1a, 1c, 2 |
-
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)
GI works |
Portions 1a |
|||
|
(c)
Excavation |
Portions 1b, 3, 5, 7, 9b, 10a, 10b |
|||
|
(d)
Construction
of retaining wall |
Portions 8a, 9b |
|||
|
(e)
Site
Formation |
Portions 1a, 1c, 1e, 2, 7 |
|||
|
(f)
Removal
of existing structure |
Portions 1a,
1c |
|||
|
(g)
Construction
of subway |
Portions 2 |
|||
|
(h)
Operation
of HAC treatment facility |
Portions 6b |
|||
|
(i)
Drainage works |
Portions 1b,
3, 5, 6a, 7, 8a, 9b, 10a, 10b |
|||
|
(j)
Road
Construction |
Portion 1b, 5, 10a |
|||
|
(k)
Trenchless |
Portion 8b |
|||
|
(l)
Construction of reservoir |
Portions 8a |
|||
|
(m)
Sheet piling/ELS |
Portion 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. -
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 3
& 9 |
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, 5 & 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, 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)
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 A1 |
- Air, Noise, Water, Waste |
||
|
(d)
Excavation
& ELS |
Portion H, K Bridge A2, A3, F |
- Air, Noise, Waste |
||
|
(e)
Site
clearance |
Portion K |
- Air, Noise, Waste |
||
|
(f)
Tree felling and transplant |
Felling: Portion D, F, C |
- Air, Noise, Waste |
||
|
ND/2019/05 |
(a)
Pre-drilling |
B2-03-P3, P5, P6, E3-04b, E3-05M and E4-01 |
- 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)
Bored
piling (Rotary type / RCD) |
B1, B2
& C1(Portion II) and D2-01. |
|||
|
(c)
Piling |
E3-04b, E3-05M and E4-01 |
|||
|
(d)
Erection of steel
bridge |
HKY FB (East) |
|||
|
(e)
ELS & Pile Cap Construction |
B1-01m, B1-02ab, C1-01b, C1-02b, C1-03ab, C2-01, C2-02, C2-03a,
C2-04a, C3-01a, C3-02, D1-02 and E2-01, E2-03 |
|||
|
(f)
Base slab Construction |
NB109 |
|||
|
(g)
Duct Works and backfilling |
Portion 13, Portion 17 and 18, TWSR (West),TWSR(East) |
|||
|
(h)
Pier/Pier head
Construction |
B1-02ab, C1-01ab, C1-02ab, C1-03ab, C1-04ab, C2-01, C2-02, D1-02,
E1-04 & E2-01, E3-02, E2-03, D2-02, D2-03 |
|||
|
(i)
Road Construction |
Venton Area |
|||
|
(j)
Segment Fabrication |
bridge C2 & C3 & D1 & E1 |
|||
|
(k)
Segments Erection |
bridges D1 and E1 |
|||
|
(l)
SOP & Segment construction (precast & in-situ cast in sype) |
C4-04, E3-03, E2-02 |
|||
|
ND/2019/06 |
Site Clearnace |
Portions 4 |
N/A |
N/A |
|
ND/2019/07 |
(a)
Erection of site hoarding |
Portions 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 1, 2, 4, 5 |
|||
|
(c)
Construction of box culvert |
Portions 2 |
|||
|
(d)
Filling works |
Portions 1, 2, 4 |
|||
|
(e)
Construction of site haul road |
Portions 4 |
|||
|
(f)
Drainage Works |
Portion 1, 3, 4, 5 |
|||
|
(g)
Sewerage works |
Portion 1, 3, 4, 5 |
|||
|
(h)
Construction of Noise Barrier |
Portion 5 |
|||
|
(i)
Waterworks |
Portion 1 |