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

Contract No.

Site Activities (October and November 2020)

Potential Environmental Impact

Control Measures

ND/2019/01

(a)   Ground Investigation, Site Clearance, Tree Felling in Portion 1f;

Dust impact from exposed site surfaces during dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from drill rigs, other plants

1. Well-maintained plant and equipment

2. Deployment of proprietary noise barriers for noisy works near sensitive receivers 

Timber waste

1. Sorting, cutting & delivering the suitable timber to shredding facilities for recycling and reuse

(b)  Site Clearance, Ground Investigation, Construct temporary road in Portion 2

Dust impact from exposed site surfaces during dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from drill rigs, other plants

1. Well-maintained plant and equipment

2. Deployment of proprietary noise barriers for noisy works near sensitive receivers 

(c)   Tree Survey, Site Clearance in Portion 3

Dust impact from exposed site surfaces during dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from grass trimmer or other plants

1. Well-maintained plant and equipment

2. Deployment of proprietary noise barriers for noisy works near sensitive receivers 

(d)  Construct temporary noise barrier, construct open channel and sand trap in Portion 4

Dust impact from exposed site surfaces during dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from hand-held breaker or other plants

1. Well-maintained plant and equipment

2. Deployment of proprietary noise barriers for noisy works near sensitive receivers 

(e)   Site Clearance, temporary slope cutting temporary soil nailing in Portion 5

Dust impact from exposed site surfaces during dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from grass trimmer or other plants

1. Well-maintained plant and equipment

2. Deployment of proprietary noise barriers for noisy works near sensitive receivers 

Wash water from dust suppression sprays

1. Appropriate & sufficient desilting/sedimentation devices provided on site for treatment before discharge

2. Establish sediment control measure (retention pit with soil berm)  at near all excavation area / low-lying region

(f)   Site Clearance, temporary slope cutting temporary soil nailing, sheetpiling and excavation, pipes laying in Portion 6a

Dust impact from exposed site surfaces during dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from grass trimmer or other plants

1. Well-maintained plant and equipment

2. Deployment of proprietary noise barriers for noisy works near sensitive receivers 

Wash water from dust suppression sprays

1. Appropriate & sufficient desilting/sedimentation devices provided on site for treatment before discharge

2. Establish sediment control measure (retention pit with soil berm)  at near all excavation area / low-lying region

(g)  Completion of Soil Treatment Facility, Pilot trial for Ex-situ cement mixing (ECM) for soil treatment, provide soil treatment for HAC soil by ECM in Portion 6b;

Dust impact from active works area, exposed site surfaces and unpaved roads, particularly during dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from concrete mixing backhoes, other plants

1. Well-maintained plant and equipment

2. Deployment of proprietary noise barriers for noisy works near sensitive receivers 

Dust from Arsenic-containing soil

1.Cover the Arsenic-containing soil with impervious sheeting to prevent dust emission or run-off during heavy rain

(h)  Site Clearance, Tree felling, Construction of temporary road for alternative Po Lau Road, Land contamination assessment in Area T1, T2 & T3 in Portion 7;

Dust impact from active works area, exposed site surfaces and unpaved roads, particularly during dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from grass trimmer or other plants

1. Well-maintained plant and equipment

2. Deployment of proprietary noise barriers for noisy works near sensitive receivers 

(i)    Ground Investigation, Construction of Retaining Wall, cut slope and soil nailing works in Portion 8a;

Dust impact from active works area, exposed site surfaces and unpaved roads, particularly during dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from drill rigs, other plants

1. Well-maintained plant and equipment

2. Deployment of proprietary noise barriers for noisy works near sensitive receivers

Runoff and drainage from the works area

1. Appropriate & sufficient desilting/sedimentation devices provided on site for treatment before discharge

2. Well maintain the drainage system to prevent the spillage of wastewater

3. Establish sediment control measure (retention pit with soil berm)  at near all excavation area / low-lying region

4. Covering stockpiling area by impervious sheets

5. Slope stabilization (such as hydroseeding)

Fuel and lubricants from maintenance of construction vehicles and mechanical equipment.

1.      Sufficient drip tray & spill kit on site

2.      Store chemical containers in chemical storage area/on drip-tray

(j)    Tree Survey, Site Clearance, Ground Investigation in Portion 9b&9d

Dust impact from exposed site surfaces during dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from grass trimmer or other plants

1. Well-maintained plant and equipment

2. Deployment of proprietary noise barriers for noisy works near sensitive receivers 

(k)  Stockpile of soil in Portion 9c;

Dust from stockpiles in dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

Wash water from dust suppression sprays

Runoff and drainage from the works area

1. Appropriate & sufficient desilting/sedimentation devices provided on site for treatment before discharge

2. Establish sediment control measure (retention pit with soil berm)  at near all excavation area / low-lying region

(l)    Site Clearance, Tree felling, Excavation, Pipes Laying in Portion 10a; and

Dust impact from active works area, exposed site surfaces and unpaved roads, particularly during dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from grass trimmer or other plants

1. Well-maintained plant and equipment

2. Deployment of proprietary noise barriers for noisy works near sensitive receivers 

(m)      Site Clearance, Demolition of existing structure in 10b

Dust impact from active works area, exposed site surfaces and unpaved roads, particularly during dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from concrete breaker or other plants

1. Well-maintained plant and equipment

2. Deployment of proprietary noise barriers for noisy works near sensitive receivers 

ND/2019/03

(a)   Road and Drainage work, Soil Replacing in Portion 1;

Dust impact from active works area, exposed site surfaces and unpaved roads, particularly during dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from concrete breaker or other plants

1. Well-maintained plant and equipment

2. Deployment of proprietary noise barriers for noisy works near sensitive receivers 

(b)  Portion 2 to Portion 20

 

 

-          Recommended initial maintenance work

Dust impact from active works area, exposed site surfaces and unpaved roads, particularly during dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

-          Erection of Permanent Boundary Structure at Portion 18 in Portion 2 to 20

Dust impact from exposed area

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

-          Installation of Lockable Gate at Portion 18

Noise from electric breaker, other plants

1. Well-maintained plant and equipment

2. Deployment of proprietary noise barriers for noisy works near sensitive receivers 

-          Construction of Irrigation Channel

Dust impact from active works area, exposed site surfaces and unpaved roads, particularly during dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from concrete breaker or other plants

1. Well-maintained plant and equipment

2. Deployment of proprietary noise barriers for noisy works near sensitive receivers 

-          Geotechnical Works in Long Valley(Trail Pits & Drill Hole)

 

Dust impact from active works area, exposed site surfaces and unpaved roads, particularly during dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from drill rigs, other plants

1. Well-maintained plant and equipment

2. Deployment of proprietary noise barriers for noisy works near sensitive receivers 

-          Construction of Temporary Road in Long Valley

 

Dust impact from active works area, exposed site surfaces and unpaved roads, particularly during dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from roadworks

1. Well-maintained plant and equipment

2. Enclose relatively noisy mechanical part by noise isolating mat

3. Deployment of proprietary noise barriers for noisy works near sensitive receivers

-          Demolition of Existing Construction in Handed over Area

 

Dust impact from exposed area

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from concrete breaker or other plants

1. Well-maintained plant and equipment

2. Enclose relatively noisy mechanical part by noise isolating mat

3. Deployment of proprietary noise barriers for noisy works near sensitive receivers

-          Construction works of storage shed and type 2 Storage House

 

Dust impact from exposed area

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from concrete breaker or other plants

1. Well-maintained plant and equipment

2. Enclose relatively noisy mechanical part by noise isolating mat

3. Deployment of proprietary noise barriers for noisy works near sensitive receivers

-          Wetland Creation & Restoration works after Obtaining Approval from AFCD

N/A

N/A

(c)   Site clearance and Demolition in Portion 22

Dust impact from exposed area

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from concrete breaker or other plants

1. Well-maintained plant and equipment

2. Enclose relatively noisy mechanical part by noise isolating mat

3. Deployment of proprietary noise barriers for noisy works near sensitive receivers

(d)  Fish Cage Placing for Pre-Translocation in Portion 23 and 24

N/A

N/A

(e)   Fence off Portion 26

Dust impact from exposed area

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

ND/2019/05

(a)   Site Clearance

Dust impact from exposed area

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from concrete breaker or other plants

1. Well-maintained plant and equipment

2. Enclose relatively noisy mechanical part by noise isolating mat

3. Deployment of proprietary noise barriers for noisy works near sensitive receivers

(b)  Establishment of Temporary Site

Dust impact from exposed area

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

(c)   Tree Felling

Dust impact from exposed area

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from grass trimmer or other plants

1. Well-maintained plant and equipment

2. Deployment of proprietary noise barriers for noisy works near sensitive receivers 

Timber waste

1. Sorting, cutting & delivering the suitable timber to shredding facilities for recycling and reuse

(d)  Trial Pits

Dust impact from active works area, exposed site surfaces and unpaved roads, particularly during dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from excavator, other plants

1. Well-maintained plant and equipment

2. Deployment of proprietary noise barriers for noisy works near sensitive receivers 

(e)   Installation of site hoarding, fencing and temp. facilities

Dust impact from active works area, exposed site surfaces and unpaved roads, particularly during dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

(f)   Construction of PM’s Site Accommodation Ground Investigation/Pre-drilling

Dust impact from active works area, exposed site surfaces and unpaved roads, particularly during dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from drill rigs, other plants

1. Well-maintained plant and equipment

2. Deployment of proprietary noise barriers for noisy works near sensitive receivers 

ND/2019/06

(a)   Construction of Management Office Building;

Dust impact from active works area, exposed site surfaces and unpaved roads, particularly during dry weather

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from drill rigs, other plants

1. Well-maintained plant and equipment

2. Deployment of proprietary noise barriers for noisy works near sensitive receivers 

Runoff and drainage from the works area

1. Appropriate & sufficient desilting/sedimentation devices provided on site for treatment before discharge

2. Well maintain the drainage system to prevent the spillage of wastewater

3. Establish sediment control measure (retention pit with soil berm)  at near all excavation area / low-lying region

4. Covering stockpiling area by impervious sheets

5. Slope stabilization (such as hydroseeding)

(b)   Breaking up the concrete surface and disposal of C&D material off site at Portion 3

Dust impact from exposed area

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from concrete breaker or other plants

1. Well-maintained plant and equipment

2. Enclose relatively noisy mechanical part by noise isolating mat

3. Deployment of proprietary noise barriers for noisy works near sensitive receivers

Fuel and lubricants from maintenance of construction vehicles and mechanical equipment.

1. Sufficient drip tray & spill kit on site

2. On-site sorting and screening for reuse (e.g. backfilling, hard paving the haul road & reuse in other projects)

3. Store chemical containers in chemical storage area/on drip-tray

(c)   Construction of footings of steel canopy of final stage market

Dust impact from exposed area

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Fuel and lubricants from maintenance of construction vehicles and mechanical equipment.

1. Sufficient drip tray & spill kit on site

2. Store chemical containers in chemical storage area/on drip-tray

1.    Tree felling at Portion 3 and 6

Dust impact from exposed area

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from grass trimmer or other plants

1. Well-maintained plant and equipment

2. Deployment of proprietary noise barriers for noisy works near sensitive receivers 

Timber waste

1. Sorting, cutting & delivering the suitable timber to shredding facilities for recycling and reuse

2.    Fabrication of Container type toilets for relocation of public toilet

Dust impact from exposed area

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

3.    Fabrication and welding test of columns and steel truss of steel canopy in China.

Dust impact from exposed area

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

4.    Application of coating for columns and steel truss of steel canopy in China.

Fuel and lubricants from maintenance of construction vehicles and mechanical equipment.

1. Sufficient drip tray & spill kit on site

2. Store chemical containers in chemical storage area/on drip-tray

5.    Site clearance and concreting of blinding layer for erection of container type toilets.

Dust impact from exposed area

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from concrete breaker or other plants

1. Well-maintained plant and equipment

2. Enclose relatively noisy mechanical part by noise isolating mat

3. Deployment of proprietary noise barriers for noisy works near sensitive receivers

6.    Erection of temporary public toilet.  Connection of electricity and water supply for the container type toilets.

Dust impact from exposed area

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from electric breaker or other plants

1. Well-maintained plant and equipment

2. Enclose relatively noisy mechanical part by noise isolating mat

3. Deployment of proprietary noise barriers for noisy works near sensitive receivers

7.    Demolition of existing public toilet.

Dust impact from exposed area

1. Covering stockpiling area by impervious sheets

2. Spraying all dusty material with water immediately prior to any loading transfer operations

3. Keep the haul road wet by water sprinkler or water bowser

4. Cover the dusty material on the dump truck

5. Speed control for the site vehicles

Noise from concrete breaker or other plants

1. Well-maintained plant and equipment

2. Enclose relatively noisy mechanical part by noise isolating mat

3. Deployment of proprietary noise barriers for noisy works near sensitive receivers

8.    Relocation of Refuse Collection Point (RCP).

Accumulation of refuse on site

1.Clear the refuse on site regularly

2.Provide rubbish bins for workforces