Appendix A            IMPLEMENTATION SCHEDULE

Construction Phase

3.32

2.34

Installation of 2m high solid fences around the construction site of Pumping Station P2.

Work site / during construction

Contractor

Ö

3.34

2.34

Adopting the following good site practices and follow the dust control requirements of the Air Pollution Control (Construction Dust) Regulation:

·      Stockpiles of imported material kept on site should be contained within hoardings, dampened and / or covered during dry and windy weather;

·      Material stockpiled alongside trenches should be covered with tarpaulins whenever works are close to village houses;

·      Water sprays should be used during the delivery and handling of cement, sands, aggregates and the like.

·      Any vehicle used for moving sands, aggregates and construction waste should have properly fitting side and tail boards. Materials should not be loaded to a level higher than the side and tail boards, and should be covered by a clean tarpaulin.

Work site / during construction

All contractors

Ö

EIAO-TM, APCO,

Air Pollution Control (Construction Dust) Regulation

3.36

Section 2

1 hour and 24 hour dust monitoring and site audit

Designated air monitoring locations / throughout construction period

Contractor/ Environmental Team

Ö

EM&A Manual

Operation Phase

3.35

2.35

All proposed pumping stations, sequence batching reactor (SBR) feed pump station and sludge dewatering room would be enclosed and the outlet air from these facilities would be properly treated by deodorization facilities with 99.5% odour removal efficiency before discharge via vent pipes. 

Proposed pumping stations &STW / during operation

Contractor/DSD

Ö

Ö

Construction Phase

4.41-4.43

3.19

·         Use of quiet PME for the construction of the pumping stations

·         Use of temporary noise barrier during the construction of Pumping Station P1a

Work site /during the construction of Pumping Stations 

Contractor

Ö

EIAO-TM, NCO

4.44 – 4.49

3.19

Implementation of following measures during the sewer construction:

·       Use of quiet PME or method;

·       Restriction on the number plant (1 item for each type of plant); and

·      Good Site Practices

-      Only well-maintained plant should be operated on-site and plant should be serviced regularly during the construction program.

-      Mobile plant, if any, should be sited as far away from NSRs as possible.

-      Machines and plant (such as trucks) that may be in intermittent use should be shut down between work periods or should be throttled down to a minimum.

-      Plant known to emit noise strongly in one direction should, wherever possible, be orientated so that the noise is directed away from the nearby NSRs.

-      Material stockpiles and other structures should be effectively utilized, wherever practicable, in screening noise from on-site construction activities.

Work site /during the construction of Sewer.

Contractor

Ö

4.50 – 4.53

3.19

·          Use of noise screening structures such as acoustic shed and barrier wherever practicable and feasible in areas with sufficient clearance and headroom.

·         Adoption of manual working method wherever practicable and feasible in areas where the worksites of the proposed sewer alignment are located less than 20 m from the residential NSRs and less than 30 m from the temple (THT) and the public library.

·         Use of PME for the construction of the section of sewer between the NSR and the Pumping Station P1a should not be allowed during the excavation work of Pumping Station P1a.

Work site /during the construction of Sewer.

Contractor

Ö

4.60

Section 35

Noise monitoring

Designated noise monitoring locations / throughout construction period

Contractor/ Environmental Team

Ö

EM&A Manual

Operation Phase

4.55

3.20

Installation of silencer at Pumping Station P1a.

Pumping Station P1a / during construction

E&M Contractor

Ö

Maintenance of silencer at Pumping Station P1a

Pumping Station P1a / during operation

DSD

Ö

Construction Phase

5.77

4.35

No-dig method using Horizontal Directional Drilling (HDD) would be used for the installation of outfall pipe of about 480 m from shore to minimize the potential water quality impacts arising from the dredging works required for the submarine outfall construction.

Silt curtains will be installed around the exit area of the pilot drill.

Marine works site /

During construction of submarine outfall

Contractor

Ö

5.73 – 5.78

4.36

Dredging Works

Implementation of following measures during the dredging works:

·     dredging should be undertaken using closed grab dredgers with a maximum total production rate of 55m³/hr;

·     deployment of 2-layer silt curtains with the first layer enclosing the grab and the second layer at around 50m from the dredging area while dredging works are in progress;

·     dredging operation should be undertaken during ebb tide only;

·     all vessels should be sized such that adequate clearance (i.e. minimum clearance of 0.6m) is maintained between vessels and the sea bed at all states of the tide to ensure that undue turbidity is not generated by turbulence from vessel movement or propeller wash;

·     all pipe leakages should be repaired promptly and plant should not be operated with leaking pipes;

·     excess material should be cleaned from the decks and exposed fittings of barges before the vessel is moved;

·     adequate freeboard (i.e. minimum of 200mm) should be maintained on barges to ensure that decks are not washed by wave action;

·     all barges should be fitted with tight fitting seals to their bottom openings to prevent leakage of material;

Marine works site and at the identified water sensitive receivers/

During construction

Contractor

Ö

·     loading of barges should be controlled to prevent splashing of dredged material to the surrounding water, and barges should not be filled to a level which will cause the overflow of materials or polluted water during loading or transportation; and

·     the decks of all vessels should be kept tidy and free of oil or other substances that might be accidentally or otherwise washed overboard.

5.79

4.37

Construction Run-off and Drainage

Implementation of the following site practices outlined in ProPECC PN 1/94 for “Construction Site Drainage”

·     Provision of perimeter channels to intercept storm-runoff from outside the site.  These should be constructed in advance of site formation works and earthworks.

·     Works programmes should be designed to minimize works areas at any one time, thus minimizing exposed soil areas and reducing the potential for increased siltation and runoff.

·     Sand / silt removal facilities such as sand traps, silt traps and sediment basins should be provided to remove the sand / silt particles from run-off. These facilities should be properly and regularly maintained. These facilities should be carefully planned to ensure that they would be installed at appropriate locations to capture all surface water generated on site.

·     Careful programming of the works to minimise soil excavation works during rainy seasons.

·     Exposed soil surface should be protected by paving or hydroseeding as soon as possible to reduce the potential of soil erosion.

Construction works sites

Contractor

Ö

ProPECC PN 1/94

·          Trench excavation should be avoided in the wet season, and if necessary, these should be excavated and backfilled in short sections.

·          Open stockpiles of construction materials on site should be covered with tarpaulin or similar fabric.

5.80

4.38

General Construction Activities

Debris and rubbish generated on-site should be collected, handled and disposed of properly to avoid entering the nearby coastal waters and stormwater drains. All fuel tanks and storage areas should be provided with locks and be sited on sealed areas, within bunds of a capacity equal to 110% of the storage capacity of the largest tank. Open drainage channels and culverts near the works areas should be covered to block the entrance of large debris and refuse.

Construction works sites

Contractor

Ö

5.81

4.39

Wastewater Arising from Workforce

Portable toilets should be provided by the Contractors, where necessary, to handle sewage from the workforce. The Contractor should also be responsible for waste disposal and maintenance practices.

Construction works sites

Contractor

Ö

5.96

Section 4

Water quality monitoring 

Designated water monitoring locations/ throughout construction period

Contractor

Ö

EM&A Manual

Operation Phase

5.84 – 5.90

4.40

The following mitigation measures and contingency measures implemented in order to minimize the potential impact from emergency discharge on the nearby FCZ:

·       Provision of standby pump at all pumping stations and the STW in case of pump failure;

·       Provision of standby generator at all pumping stations in case of interruption of electrical power supply;

·       Provision of 24-hour temporary storage for all pumping stations in emergency;

·       Use of SBR units as storage tanks in case STW failure;

·       No emergency discharge is allowed at Pumping Station P2 and the STW;

·       Automatically shutdown the pumping station at Lo So Shing in case of Pumping Station P1a failure;

·       Automatically shutdown the upstream pumping stations (Pumping Station P1a and Lo So Shing pumping station) in case of Pumping Station P1b failure;

·       Automatically shutdown the upstream pumping stations (including Pumping Stations P1a and P1b, and Lo So Shing pumping station) in case of Pumping Station P2 failure;

·       Automatically shutdown all pumping stations (including Pumping Stations P1a, P1b and P2, Lo So Shing and Mo Tat Wan Pumping Stations) in case of STW failure;

·       Implement a telemetry system to ensure prompt action to be undertaken in an emergency occasion.

Proposed pumping station & STW

DSD/Contractor

Ö

Ö

5.83

4.42

The proposed STW would provide a full secondary level sewage treatment with nitrogen removal and UV disinfection.

STW / During operation of the STW

DSD

Ö

5.92

4.41

A detailed emergency response plan for emergency discharges based on the major components in Appendix 5.4 should be prepared during the subsequent detailed design stage.

Pumping stations and STW / During operation phase

DSD

Ö

Ö

5.96

Section 4

Water quality monitoring 

Designated water monitoring locations/ 1 year following operation of the STW

DSD

Ö

EM&A Manual

6.17

5.3

Follow the requirement and procedures for dredged mud disposal specified under the WBTC No. 34/2002.

Marine works site / during dredging works

Contractor

Ö

WBTC No. 34/2002

6.18

5.4

Implement appropriate dredging methods which have been incorporated into the recommended water quality mitigation measures.

Marine works site, during dredging works

Contractor

Ö

6.19

5.5

During the transportation and disposal of the dredged sediment, the following measures should be taken:

·       Bottom opening of barges should be fitted with tight fitting seals to prevent leakage of material. Excess material should be cleaned from the decks and exposed fittings of barges and hopper dredgers before the vessel is moved.

·       Monitoring of the barge loading should be conducted to ensure that loss of material does not take place during transportation. Transport barges or vessels should be equipped with automatic self monitoring devices as specified by the DEP.

Marine works site and at the identified sensitive receivers

Contractor

Ö

Construction Phase

7.14

6.4

Good site practices

·          Nomination of an approved person, such as a site manager, to be responsible for implementation of good site practices, arranging for collection and effective disposal to an appropriate facility, of all wastes generated at the site

·          Training (proper waste management and chemical handling procedure) should be provided for site staffs

·          Appropriate measures to minimize windblown litter and dust during transportation of waste by either covering trucks or by transporting wastes in enclosed containers.

·          Provision of sufficient waste disposal points and regular collection for disposal.

·          Separation of chemical wastes for special handling and appropriate treatment at the Chemical Waste Treatment Facility.

·          Regular cleaning and maintenance programme for drainage systems, sumps and oil interceptors.

·          Maintain records of the quantities of wastes generated, recycled and disposed.

Work sites/During construction

Contractor

Ö

Waste Disposal Ordinance (Cap.54)

7.15

6.5

To monitor the disposal of C&D waste at landfills and to control fly tipping, a trip-ticket system should be included as one of the contractual requirements and implemented by an Environmental Team undertaking the Environmental Monitoring and Audit work.  An Independent Environmental Checker should be responsible for auditing the results of the system.

Work sites/During construction

Contractor

Ö

WBTC No. 21/2002

7.16

6.6

Recommendations to achieve waste reduction include:

·           segregation and storage of different types of waste in different containers, skips or stockpiles to enhance reuse or recycling of materials and their proper disposal;

·           to encourage collection of aluminium cans by individual collectors, separate labelled bins should be provided to segregate this waste from other general refuse generated by the work force;

·           any unused chemicals or those with remaining functional capacity should be recycled;

·           use of reusable non-timber formwork to reduce the amount of C&D material;

·           prior to disposal of C&D waste, it is recommended that wood, steel and other metals should be separated for re-use and / or recycling to minimise the quantity of waste to be disposed of to landfill;

·           proper storage and site practices to minimise the potential for damage or contamination of construction materials; and

Work sites/During construction

Contractor

Ö

WBTC No. 4/98, 5/98

·          plan and stock construction materials carefully to minimise amount of waste generated and avoid unnecessary generation of waste.

7.18

6.7

General Site Wastes

·          A collection area for construction site waste should be provided where waste can be stored prior to removal from site

·          An enclosed and covered area for the collection of the waste is recommended to reduce ‘wind blow’ of light material

Work sites/During construction

Contractor

Ö

Public Health and Municipal Services Ordinance (Cap. 132)

7.19-7.20

6.8 – 6.9

Chemical Wastes

·          After use, chemical waste should be handled according to the Code of Practice on the Package, Labelling and Storage of Chemical Wastes

·          Any unused chemicals or those with remaining functional capacity should be recycled

·          Waste should be properly stored on site within suitably designed containers and should be collected by an approved licensed waste collectors for disposal at the Chemical Waste Treatment Facility or other licenced facility in accordance with the Waste Disposal (Chemical Waste) (General) Regulation under the Waste Disposal Ordance.

·          Any service shop and minor maintenance facilities should be located on hard standing within a bunded area, and sumps and oil interceptors should be provided.

Work sites/During construction

Contractor

Ö

Waste Disposal (Chemical Waste) (General) Regulation, Code of Practice on the Packaging Labelling and Storage of Chemical Wastes

·          Maintenance of vehicles and equipment involving activities with potential for leakage and spillage should be undertaken within the designated areas equipped control these discharges

7.21-7.22

6.10 – 6.11

Construction and Demolition Material

·          The C&D waste should be separated on-site into three categories:

-      public fill, the inert portion of the C&D material (e.g. concrete and rubble), which should be re-used on-site or disposed of at a public filling area;

-      C&D waste for re-use and / or recycling, the non-inert portion of the C&D material, (e.g. steel and other metals, woods, glass and plastic);

-      C&D waste which cannot be re-used and / or recycled (e.g. wood, glass and plastic)

·          Where possible, inert material should be re-used on-site

·          Where practicable, steel and other metals should be separated for re-use and/or recycling prior to disposal of C&D material

During all construction phases

Contractors

Ö

WBTC No. 4/98, 5/98, 21/2002, 25/99, 12/2000

Operation Phase

7.24

6.12

Sewage sludge generated from the STW would be dewatered on-site and the sludge cake would be either delivered to Sok Kwu Wan refuse transfer station for subsequent disposal to nearby landfill.

STW / During operation

DSD

Ö

EIA Ref

EM&A Ref

Environmental Protection Measures*

Location / Timing

Implementation Agent

Implementation Stages

Relevant Legislation & Guidelines

D

C

O

Construction Phase

8.157

7.2

Terrestrial Ecology

-     Labeling and fencing of the uncommon tree species

-    Avoidance of use of woodland habitats as Works Area, in particular where trees are located

Work sites / during construction phase

Contractor

Ö

8.159 – 8.160

7.3

Subtidal Ecology

Use of HDD technique

Dredging

-      Use of closed-grab dredger

-      Deploy silt curtains during dredging.

Marine works site / during dredging works

Contractor

Ö

8.161

7.4

Site runoff

-      Construction and maintenance of sand / silt removal facilities

-      Silt curtains

-      Timing of earthworks

-      Coverage of sand / fill piles during storms.

-      Barriers along the landward side of Pumping Station P2 site boundary (to prevent site runoff from entering area with Romer’s Tree Frog)

All work sites / during construction phase

Contractor

Ö

9.29

8.3

Use of closed grab dredging and silt curtains around the immediate dredging area and low dredging rates as recommended in Water Quality of the EIA report

Marine works site, during dredging works

Contractor

Ö

TM on EIA Process

9.32

Section 8

Water quality monitoring  (see Implementation Schedule for Water Quality Control Measures)

Designated monitoring locations / throughout construction period and 1 year following operation of the STW

Contractor and Environmental Team

Ö

Ö

EM&A Manual

Construction Phase

10.74

9.10

Retaining existing trees and minimizing damage to vegetation by close coordination and on site alignment adjusted of rising main and gravity sewer pipelines.

All sites

Contractor

Ö

WBTC No. 14/2002

Careful and efficient transplanting of affected trees to temporary or final transplant location (the proposed tree to be transplanted is a semi-mature Macaranga tanarius and is located at the proposed Pumping Station P2 location).

All sites

Contractor

Ö

WBTC No. 14/2002

Short excavation and immediate backfilling sections upon completion of works to reduce active site area.

All sites

Contractor

Ö

Screening of site construction works by use of hoarding that is appropriate to its site.

All sites

Contractor

Ö

WBTC No. 19/2001

Conservation of topsoil for reuse.

All sites

Contractor

Ö

Night-time light source from marine fleets should be directed away from the residential units.

Outfall area.

Contractor

Ö

Operation Phase

10.75

9.12

Architectural finishes to proposed structures, which area sympathetic to the surrounding landscape

Pumping stations and STW

DSD

Ö

Soft landscape to proposed structures

Pumping stations and STW

DSD

Ö

Ö

WBTC No. 14/2002

Planting to reformed slope in-keeping with the surrounding landscape character

Reformed Slope behind STW

DSD

Ö

Ö

WBTC No. 17/2000 & 25/93

Appropriate finishes to reinstated areas of footpath in-keeping with existing finishes

All sites

DSD

Ö

Ö

WBTC No. 14/2002

Appropriate paint finishes to sections of exposed pipeline

All sites

DSD

Ö

Ö