Table 11.1    Summary Table for Site Activities, Potential Environmental Impacts and Recommended Mitigation Measures in the coming Two Months

 

Contract No.

Major Site Activities (November and December 2020)

Location/ Working Period

Potential Environmental Impact

Recommended Mitigation Measures

ND/2019/01

(a)   Site clearance

Portion 1f, 2, 5, 6a,7,8a,9c, 10a, 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.

-              Install sprinkler system for dust suppression.

-              Erect scaffolding with dust screens for demolition of existing structure.

-              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 practicable.

-              Conduct noise monitoring regularly.

 

Water

-              Re-circulation / re-use of water to minimize wastewater generation.

-              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 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 EcoPark for reuse.

(b)  GI works

Portion 2, 7

(c)   Excavation

Portion 6a,10a

(d)  Construction of temporary road

Portion 7, 8a

(e)   Construction of retaining wall

Portion 8a

(f)   Sheetpiling

Portion 6a, 10a

(g)  Soil nailing / shotcrete

Portion 6a, 8a

(h)  Demolition of existing structure

Portion 11a

(i)    Pre-bored H pile

Portion 6a

(j)    Pilot trial for arsenic soil treatment works

Portion 6b

ND/2019/02

(a)         Underground Utility Detection

All Portions

No impacts

-              Dusty works should be sprayed with water or idle stockpile or slope 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 disposed 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 licence.

-              Dull green barrier and ecological measures should be implemented according to the Ecological protection plan.

(b)         Tree Felling

Portion 7, 10

Air, Noise,Waste

(c)         Trial Pit

Portion 7, 9, 10

Air, Noise,Water,

Waste

(d)        GI

Portion 7, 9, 10

Air, Noise,Waste

(e)         Hoarding erection

Portion 7, 9, 10

Air, Noise,Water,

Waste

(f)          Pre-bored Socketed H-pile

Portion 7, 9, 10

Air, Noise, Water, Waste, Ecology

(g)         ELS

Portion 7, 9, 10

Air, Noise, Water, Waste, Ecology

(h)         Lowering the Existing Carriageway

Portion 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/2019/05

(a)         Bored piling

D2-02, E2-02& E3-02

-     Construction Dust Impact

-     Noise Impact

-     Water Quality Impact (Construction Phase)

 

-     Waste Management  (Construction Waste)

-              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

(b)         Socketed H-pile installation

Ho Ka Yuen Footbridge

(c)         Formation of site entrance

C1-02 and C3-03

(d)        Construction of haul road, temporary footpath and cycle track

D2-02, C4-01a, C2-01

(e)         Road widening, site clearance and tree pruning for haul road

E2-02

(f)          Structural works

Project Manager¡¦s Site Accommodation

(g)         Public service removal application

Jockey Club Road

(h)         Permanent footpath construction

Jockey Club Road

(i)          Removal of existing noise barrier

Tai Wo Service Road West

(j)          Pedestrian Refuge Island Removal

Tai Wo Service Road West

(k)         Underground utility diversion

Tai Wo Service Road West

(l)          Box culvert BC5 and associated drainage construction

Tai Wo Service Road East

(m)       Temporary removal of noise barrier and sign gantry for D2-03 construction

Fanling Highway

ND/2019/06

(a)         Construction of superstructure and finishing works of 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 disposal

(b)         Breaking up the concrete surface and disposal of C&D material off site

Portion 3

-     C&D waste

-     Noise Pollution

-              Cover C&D waste by impervious sheeting

-              Adopt QPME for excavator

(c)         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)        Tree felling

Portion 6

-     C&D waste

-     Noise Pollution

-              Cover C&D waste by impervious sheeting

-              Adopt QPME for excavator

(e)         Off-site fabrication and welding test of columns and steel truss of steel canopy

China

None

None

(f)          Application of coating for columns and steel truss of steel canopy

China

None

None

(g)         Demolition of existing public toilet

Portion 5

-     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

(h)         Slope improvement works

Portion 6

-     C&D waste

-     Air Pollution

-     Noise Pollution

-              Cover C&D waste by impervious sheeting

-              Spray with water to work area before, during and after the work

-              Adopt QPME for excavator