12.1 The
major site activities, potential
environmental impacts and recommended mitigation measures for
the coming two 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 (February to March
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 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. -
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/ upcycling or agreed alternative site. |
|
(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)
Soil
nailing/ grouting |
Portion
8a |
|||
|
(f)
Demolition
of existing structure |
Portion 1a, 1e, 9b |
|||
|
(g)
Construction
of temporary site haul road |
Portion 2, 5, 6a, 7, 8a, 10a |
|||
|
(h)
Operation
of HAC treatment facility |
Portion 6b |
|||
|
(i)
Tree
felling |
Portion 1a, 2, 3 |
|||
|
(j)
Drainage
Works |
Portion 1b, 5, 6a, 7, 8a, 9b, 10a, 10b, 11b |
|||
|
(k) Sheetpiling |
Portion 1b, 5,
6a, 7, 8b, 9b, 10a, 10b |
|||
|
|
|
|||
|
ND/2019/02 |
(a)
Pipe Jacking |
Portion 1, 3 |
Air, Noise, Waste |
-
Dusty
works should be spray water or 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)
ELS |
Portion 3, 7,
9 |
Air, Noise, Waste |
||
|
(c)
Concreting |
Portion 3, 9,
10 |
Air, Noise, Water, Waste, Ecology |
||
|
(d)
Backfilling |
Portion 3 |
Air, Noise, Water, Waste, Ecology |
||
|
(e)
Sheet Pile Installation |
Portion 3, 7 |
Air, Noise, Water, Waste, Ecology |
||
|
(f)
Bedding and Pipe Laying |
Portion 3 |
Air, Noise, Water, Waste |
||
|
|
(g)
Cut and Fill of Slope |
Portion 7 |
Air, Noise, Water, Waste |
|
|
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 |
|
|
ND/2019/04 |
(a)
Sheet
piling |
Portion
H, Bridge F, A2 |
-
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, A3, Portion E, H |
-
Air,
Noise, Water, Waste |
||
|
(d)
Excavation
and ELS |
Portion H |
-
Air,
Noise, Waste |
||
|
(e)
Site
clearance |
Portion H |
-
Air,
Noise, Waste |
||
|
(f)
Tree
felling |
Portion H |
-
Air,
Noise, Waste |
||
|
ND/2019/05 |
(a)
Pre drilling for bored piles |
C1 01aM P1, B2
02 P2 & C1 02a P2 |
-
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. |
|
(b)
Bored piling |
D2 03 , B1 01M P4, B1 01M P6, C1 04aM P3, C1
04bM P2, C2 01 P1, C2 02 P6, C2 03a P1 |
|||
|
(c)
Pipe Pilling |
D1 01, E1 01,
E1 02 and E1 03 , C1 01bM, C3 04b, E1 04 & D1 04 |
|||
|
(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 |
Portion 17 and
18 E2 03 E3 01 , C3 03b & C4
03 |
|||
|
(f)
Footing Construction |
C4-02 |
|||
|
(g) Utitilies Diversion Works and Permanent
Road Works |
Portion 11 |
|||
|
(h)
Pier/
Column Construction |
E2 02 E3 03 , C4 04 |
|||
|
(i)
Haul road
construction |
Portion 6 |
|||
|
(j)
Launching Girder & Form Traveler Fabrication |
CTC Storage Yard |
|||
|
(k)
Drainage & Water Mains construction |
Portion XI,
XIII, XVII, XVIII |
|||
|
(l)
Catch Fence Construction |
D2 01 |
|||
|
(m)
Tree Removal |
CTC yard |
|||
|
(n)
Demolition |
HD existing
factory, TSH portion A D |
|||
|
ND/2019/06 |
A.
Rectification
works for T&C of E&M installations for the steel canopy, MOB and
additional water tank and pump house |
Portion 3 |
-
Noise
pollution - Air pollution |
-
Adopt
noise barrier in screening noise -
Adopt
ultra-low Sulphur diesel |
|
B.
Electrical
board installations at stall area under the steel canopy |
Portion 3 |
-
Air
pollution -
Noise
pollution |
-
Adopt
“Approved” NRMM Label -
loading
material shall be kept in minimum height and speed |
|
|
C.
Construction
of concrete carriageway |
Portion 3 |
-
Air
pollution -
Noise
pollution |
-
Adopt
QPME for excavator -
Washing
the truck wheel before leaving the site |
|
|
D.
Construction
of screeding on stall area |
Portion 3 |
-
Noise
pollution -
Air
pollution |
-
Adopt
noise barrier in screening noise -
Wastewater
generated from screeding should be treated properly before disposal |
|
|
E.
Construction
of footings of additional covered |
Portion 3 |
-
Noise
pollution -
C&D
waste |
-
Adopt
QPME for excavator -
Cover
C&D waste by impervious sheeting -
Washing
the truck wheel before leaving the site |
|
|
F.
Finishing
works for the additional water tank and pump house |
Portion3 |
-
Air
pollution -
Noise
pollution |
-
Unloading
materials shall be kept in minimum height and speed -
Adopt “ Approved” NRMMM\Label |
|
|
G.
Installation
of Cat Ladder (Water tank of new pump house) |
Portion3 |
-
Air
pollution -
Noise
pollution |
-
Sprinkled
dusty works with water -
Adopt
noise barrier in screening noise |
|
|
H.
CI covers
and grating installation |
Portion 3 |
-
Noise
pollution |
-
loading
material shall be kept in minimum height and speed |
|
|
|
I.
Road
light installation |
Portion 3 |
-
Noise
pollution |
-
loading
material shall be kept in minimum height and speed |
|
|
J.
Clearance
of drainage channels and general site clearance |
Portion 3 |
-
C&D
waste -
Air
pollution |
-
Waste are sorted properly -
Adopt
ultra-low Sulphur diesel |
|
N D/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 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 4 |
|||
|
(c)
C&D waste disposal |
Portion 1, 2,
4, 5 |
|||
|
(d) Ground
investigation works |
Portion 3, 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 1, 4 |
|||
|
(i)
Sewage works |
Portion 1, 3 |
|||
|
(j)
Demolition of villager’s houses |
Portion 4, 5 |
|||
|
(k) Drainage
Works |
Portion 1, 3 |
|||
|
|
|
12.2
The major
site activities in coming two months is shown in Table IV.
12.3
The
tentative environmental monitoring schedule for next month is shown in Appendix D.
12.4
A
tentative construction programme is provided in Appendix A.