Appendix A     Implementation Schedule of Proposed Mitigation Measures

Table A1          Implementation Schedule for Air Quality Impact

EIA Ref #

EM&A Ref#

Environmental Protection Measures / Mitigation Measures

Location / Timing

Implementation Agent

Implementation Stages*

Relevant Legislation and Guidelines

Des

C

O

Dec

S3.25

S2.57

Implementation of the dust suppression measures stipulated in the Air Pollution Control (Construction Dust) Regulation.

 

Construction site / construction phase

Contractor

 

Ö

 

 

EIAO-TM

S3.25

S2.57

Good site practices and a comprehensive dust monitoring and audit programme are recommended to minimise dust impacts.  Control measures relevant to this Project are listed below:

 

·         Skip hoist for material transport should be totally enclosed by impervious sheeting;

·         Vehicle washing facilities should be provided at every vehicle exit point;

·         The area where vehicle washing takes place and the section of the road between the washing facilities and the exit point should be paved with concrete, bituminous materials or hardcore;

·         Where a site boundary adjoins a road, streets or other areas accessible to the public, hoarding of not less than 2.4 m high from ground level should be provided along the entire length except for a site entrance or exit;

·         Use of regular watering, with complete coverage, to reduce dust emissions from exposed site surfaces and unpaved roads, particularly during dry weather;

·         Side enclosure and covering of any aggregate or dusty material storage piles to reduce emissions.  Where this is not practicable owing to frequent usage, watering shall be applied to aggregate fines;

·         Open stockpiles shall be avoided or covered.  Where possible, prevent placing dusty material storage piles near ASRs;

·         Tarpaulin covering of all dusty vehicle loads transported to, from and between site locations;

·         Every stock of more than 20 bags of cement should be covered entirely by impervious sheeting placed in an area sheltered on the top and the 3 sides;

·         Every vehicle should be washed to remove any dusty materials from its body and wheels before leaving the construction sites; and

·         Instigation of an environmental monitoring and auditing program to monitor the construction process in order to enforce controls and modify method of work if dusty conditions arise.

 

Construction site / construction phase

Contractor

 

Ö

 

 

EIAO-TM

S3.25

S2.59

·         Installation of a deodourizing unit (granular activated carbon) with 90% of odour removal efficiency.  A backup deodourizing unit (90% odour removal efficiency) shall also be provided for maintenance or breakdown of the main deodorization unit.

 

TM54SPS / operation phase

 

DSD

Ö

 

Ö

 

EIAO-TM

S3.27

S2.60

·         The entire TM54SPS; especially wet wells and screening collection areas should be enclosed in a building structure;

·         Discharge point of the odour removal system should be directed away from the adjacent sensitive uses as shown in Figure 2.1 and the exhaust air should be at a vertical upward flow direction;

·         Screened material from the TM54SPS should be stored in a covered container;

·         The transportation of screened material during maintenance should be transported in an enclosed type vehicle and disposed off on the same working day;

·         Checking and maintenance of the odour removal system should be implemented at least once every half year to maintain the removal efficiency; and

·         Odour removal systems, e.g. activated carbon filters, should be provided to reduce the odour emissions.

TM54SPS / operation phase

 

DSD

Ö

 

Ö

 

EIAO-TM

# All recommendations and requirements resulted during the course of EIA/EA Process, including ACE and / or accepted public comment to the proposed project.

* Des - Design, C - Construction, O – Operation, and Dec - Decommissioning


Table A2          Implementation Schedule for Noise Impact

EIA Ref #

EM&A Ref#

Environmental Protection Measures / Mitigation Measures

Location / Timing

Implementation Agent

Implementation Stages*

Relevant Legislation and Guidelines

Des

C

O

Dec

S4.35 &

App. 4.1

S3.16

Adoption of quiet plant for following construction activities/scenarios:

 

·         Site clearance

·         Bulk excavation for sub-structure and site formation

·         Steel fixing concreting of sub-structure

·         Steel fixing and concreting of roof and columns

·         Brick Works & Finishing, M&E Installation & Pipeworks, Landscape Works & Roadworks

 

Work Site / Construction Phase

Contractor

 

Ö

 

 

EIAO-TM, NCO

S4.37

S3.16

Good site practices listed below should be adopted to further abate any residual impacts during the construction phase of the Project and should be included in the contract document:

 

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

·         Silencers or mufflers on construction equipment should be utilized and should be properly maintained during the construction program;

·         Mobile plant, if any, should be sited as far 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; and

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

 

Work Site / Construction Phase

Contractor

 

Ö

 

 

EIAO-TM, NCO

S4.32

S3.18

The transformer shall be housed in enclosed 200 mm thick reinforced concrete structure with the soundproof door. The pump sets and mechanically raked screens shall be located at the basement and housed in a 200mm thick reinforced concrete structure with soundproof door.  The silencers shall be provided at the louvers of the pump house.   Acoustic silencer with noise attenuation of 10 dB(A) shall be provided for the exhaust fan of the deodorization unit.

 

TM54SPS / Operation Phase

DSD

Ö

 

Ö

 

EIAO-TM

App. 4.2

S3.18

The SWL of the pump set should not exceed 88dB(A)  The SWL of the transformer and mechanically raked screen should not exceed 85 dB(A) and 89 dB(A), respectively.  The SWL of the ventilation fan should not be higher than 83 dB(A) (make reference to Good Practices on Ventilation System Noise Control)

 

TM54SPS / Operation Phase

DSD

Ö

 

Ö

 

EIAO-TM

# All recommendations and requirements resulted during the course of EIA/EA Process, including ACE and / or accepted public comment to the proposed project.

* Des - Design, C - Construction, O – Operation, and Dec - Decommissioning


Table A3          Implementation Schedule for Water Quality Impact

EIA Ref #

EM&A Ref #

Environmental Protection Measures / Mitigation Measures

Location / Timing

Implementation Agent

Implementation Stages*

Relevant Legislation and Guidelines

Des

C

O

Dec

S5.26

S4.3

Construction Site Run-off and Drainage

The site practices outlined in ProPECC PN 1/94 “Construction Site Drainage” should be followed as far as practicable in order to minimise surface runoff and the chance of erosion:

§         At the start of site establishment, perimeter cut-off drains to direct off-site water around the site should be constructed with internal drainage works and erosion and sedimentation control facilities implemented.  Channels (both temporary and permanent drainage pipes and culverts), earth bunds or sand bag barriers should be provided on site to direct storm water to silt removal facilities.  The design of the temporary on-site drainage system will be undertaken by the contractor prior to the commencement of construction.

§         Sand/silt removal facilities such as sand/silt traps and sediment basins should be provided to remove sand/silt particles from runoff to meet the requirements of the Technical Memorandum standard under the Water Pollution Control Ordinance.  The design of efficient silt removal facilities should be based on the guidelines in Appendix A1 of ProPECC PN 1/94, which states that the retention time for silt/sand traps should be 5 minutes under maximum flow conditions.  The detailed design of the sand/silt traps shall be undertaken by the contractor prior to the commencement of construction.

§         All drainage facilities and erosion and sediment control structures should be regularly inspected and maintained to ensure proper and efficient operation at all times and particularly during rainstorms.  Deposited silt and grit should be regularly removed, at the onset of and after each rainstorm to ensure that these facilities are functioning properly at all times.

§         Measures should be taken to minimize the ingress of site drainage into excavations.  Water pumped out from foundation excavations should be discharged into storm drains via silt removal facilities.

§         If surface excavation works cannot be avoided during the wet season (April to September), temporarily exposed slope/soil surfaces should be covered by a tarpaulin or other means, as far as practicable, and temporary access roads should be protected by crushed stone or gravel, as excavation proceeds. Interception channels should be provided (e.g. along the crest/edge of the excavation) to prevent storm runoff from washing across exposed soil surfaces.  Arrangements should always be in place to ensure that adequate surface protection measures can be safely carried out well before the arrival of a rainstorm.  Other measures that need to be implemented before, during and after rainstorms are summarized in ProPECC PN 1/94.

§         All vehicles and plant should be cleaned before leaving a construction site to ensure no earth, mud, debris and the like is deposited by them on roads.  An adequately designed and sited wheel washing facility should be provided at every construction site exit where practicable.  Wash-water should have sand and silt settled out and removed at least on a weekly basis to ensure the continued efficiency of the process.  The section of access road leading to, and exiting from, the wheel-wash bay to the public road should be paved with sufficient backfall toward the wheel-wash bay to prevent vehicle tracking of soil and silty water to public roads and drains.

§         Open stockpiles of construction materials or construction wastes on-site of more than 50m3 should be covered with tarpaulin or similar fabric during rainstorms.

 

Work site / During the construction period

Contractor

 

Ö

 

 

ProPECC PN 1/94; WPCO

S5.27 - 5.28

S4.4-4.5

General Construction Activities

·        Debris and refuse generated on-site shall be collected, handled and disposed of properly to avoid entering any nearby storm water drain.  Stockpiles of cement and other construction materials shall be kept covered when not being used. 

·        Oils and fuels shall only be used and stored in designated areas which have pollution prevention facilities.  All fuel tanks and storage areas shall 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.  The bund shall be drained of rainwater after a rain event.

 

Work site / During the construction period

Contractor

 

Ö

 

 

ProPECC PN 1/94; WPCO

S5.29

S4.6

Sewage from Construction Workforce

 

Temporary sanitary facilities, such as portable chemical toilets, shall be employed on-site.  A licensed contractor shall be responsible for appropriate disposal and maintenance of these facilities.

 

Work site / During the construction period

Contractor

 

Ö

 

 

WPCO

S5.30

-

Design of TM54SPS

 

The precautionary measures listed below should be incorporated in the design of TM54SPS to avoid emergency bypass of sewage to the maximum practicable extent:

 

§         A standby pump shall be provided to cater for breakdown and maintenance of the three duty pumps in order to avoid sewage bypass

§         Backup power supply in the form of dual power supply shall be provided to secure electrical power supply

§         An alarm would be installed to signal emergency high water level in the wet well

§         Regular maintenance and checking of plant equipment to prevent equipment failure

 

TM54SPS / Design Stage

DSD

Ö

 

 

 

 

# All recommendations and requirements resulted during the course of EIA/EA Process, including ACE and / or accepted public comment to the proposed project.

* Des - Design, C - Construction, O – Operation, and Dec - Decommissioning


Table A4          Implementation Schedule for Waste Management Implications

EIA Ref #

EM&A Ref #

Environmental Protection Measures / Mitigation Measures

Location / Timing

Implementation Agent

Implementation Stages*

Relevant Legislation and Guidelines

Des

C

O

Dec

S6.21

S5.5

Good Site Practices

 

Recommendations for good site practices during the construction activities include:

 

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

·         Training of site personnel in proper waste management and chemical handling procedures

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

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

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

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

 

Work site / During the construction period

Contractor

 

Ö

 

 

Waste Disposal Ordinance (Cap.54)

ETWB TCW No. 19/2005

S6.22

S5.6

Waste Reduction Measures

 

Waste reduction is best achieved at the planning and design stage, as well as by ensuring the implementation of good site practices. 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.

·         Encourage collection of aluminium cans by providing separate labelled bins to enable this waste to be segregated from other general refuse generated by the work force

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

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

·         A recording system for the amount of wastes generated, recycled and disposed (including disposal sites) shall be proposed.

·         Training shall be provided to workers about the concepts of site cleanliness and appropriate waste management procedures, including waste reduction, reuse and recycle.

 

Work site / During planning & design stage, and construction stage

Contractor

Ö

Ö

 

 

 

S6.24

S5.8

General Refuse

 

General refuse should be stored in enclosed bins or compaction units separate from C&D material.  A reputable waste collector should be employed by the contractor to remove general refuse from the site, separately from C&D material.  Preferably an enclosed and covered area should be provided to reduce the occurrence of 'wind blown' light material.

 

Work site / During the construction period

Contractor

 

Ö

 

 

Public Health and Municipal Services Ordinance (Cap. 132)

S6.25

S5.9

Construction and Demolition Material

 

In order to minimise the impact resulting from collection and transportation of C&D material for off-site disposal, the excavated material should be reused on-site as fill material as far as possible for general filling under the Phase 2 works for the Formation, Roads and Drains in Tuen Mun Area 54. The surplus excavated material should be disposed of at the designated public fill reception facility, as agreed with the Secretary of the Public Fill Committee, for other beneficial uses.

 

C&D waste generated from site clearance and dismantling of formwork would require disposal to the designated landfill site.  In order to monitor the disposal of C&D material at the public fill reception facility and landfill and to control fly-tipping, a trip-ticket system should be included.  One may make reference to ETWB TCW No. 31/2004 for details.

 

Work site / During design stage & construction period

Contractor

Ö

 

Ö

 

 

 

 

ETWB TCW No. 33/2002

ETWB TCW No. 19/2005

S6.26

S5.10

Chemical Waste

 

If chemical wastes are produced at the construction site, the Contractor would be required to register with the EPD as a Chemical Waste Producer and to follow the guidelines stated in the Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes.   Good quality containers compatible with the chemical wastes should be used, and incompatible chemicals should be stored separately. Appropriate labels should be securely attached on each chemical waste container indicating the corresponding chemical characteristics of the chemical waste, such as explosive, flammable, oxidizing, irritant, toxic, harmful, corrosive, etc.  The Contractor shall use a licensed collector to transport and dispose of the chemical wastes, to either the Chemical Waste Treatment Centre, or another licensed facility, in accordance with the Waste Disposal (Chemical Waste) (General) Regulation.

 

Work site / During the construction period

Contractor

 

Ö

 

 

Waste Disposal (Chemical Waste) (General) Regulation

S6.27

-

Screenings

 

The screenings should be properly stored in a covered container.  The screenings would require transportation in an enclosed vehicle for disposal to the designated landfill site.

 

Inside the TM54SPS / During the operation phase

DSD

 

 

Ö

 

 

# All recommendations and requirements resulted during the course of EIA/EA Process, including ACE and / or accepted public comment to the proposed project.

* Des - Design, C - Construction, O – Operation, and Dec - Decommissioning


Table A5          Implementation Schedule for Landscape and Visual Impact

EIA Ref #

 

EM&A Ref#

Environmental Protection Measures / Mitigation Measures

Location / Timing

Implementation Agent

Implementation Stages*

Relevant Legislation and Guidelines

Des

C

O

Dec

Table 7.6

Table 7.2

No-intrusion Zone

 

To maximize protection to existing trees, woodland, plantation areas and ground vegetation, construction contracts may designate “No-intrusion Zone” to various areas within the site boundary with rigid and durable fencing for each individual no-intrusion zone.

 

The contractor should closely monitor and restrict the site working staff not to enter the “no-intrusion zone”, even for non-direct construction activities and storage of equipment.

 

Design / construction Planning

CEDD / Contractor

Ö

Ö

 

 

EIAO-TM Annex 10, 18

ETWB TCW 2/2004

ETWB TCW 3/2006

Table 7.6

Table 7.2

Hoarding

 

Hoarding or boundary fencing for construction shall be considered. It should be sensitively designed, subtle, camouflaged and more ‘permeable’ so that they fit into the existing environment when looking from outside.

 

Design / construction Planning

CEDD / Contractor

Ö

Ö

 

 

EIAO-TM Annex 10, 18

ETWB TCW 2/2004

ETWB TCW 3/2006

Table 7.6

Table 7.2

Minimize disturbance of construction workers

 

To ensure minimum disturbance to existing village, rustic dwellings and workshops users, construction works may only enter these areas with their helmets and safely vests properly stored or carried in non-transparent bags. They shall also properly and cleanly dress.

 

The construction contract should require the main contractor to issue guideline to the construction works to minimize disturbance to existing village, rustic dwellings and workshops. .

 

Work site / construction phase

CEDD / Contractor

 

Ö

 

 

EIAO-TM Annex 10, 18

ETWB TCW 2/2004

ETWB TCW 3/2006

Table 7.6

Table 7.2

Dust and Erosion Control for Exposed Soil

 

Excavation works and demolition of existing squatters / workshops which will be highly visible form surrounding areas should be well planned and with precautions to suppress dust.

 

Exposed soil shall be covered or ‘camouflaged’ and watered often. Areas that are expected to be left with bare soil for a long period of time after excavation shall be properly covered with suitable protective fabric. Silt and erosion shall be controlled by ground barriers around the slope cutting area.

 

Work site / construction phase

CEDD / Contractor

 

Ö

 

 

EIAO-TM Annex 10, 18

ETWB TCW 2/2004

ETWB TCW 3/2006

Table 7.6

Table 7.2

Construction Light

 

All security floodlights for construction sites shall be equipped with adjustable shield, frosted diffusers and reflective covers, and be carefully controlled to minimize light pollution and night-time glare to nearby village.

 

The Contractor shall consider other security measures which shall minimize the visual impacts.

 

Work site / construction phase

CEDD / Contractor

 

Ö

 

 

EIAO-TM Annex 10, 18

ETWB TCW 2/2004

ETWB TCW 3/2006

Table 7.6

Table 7.2

Re-use of Existing Soil

 

Existing topsoil shall be re-used where possible for new planting areas within the project.

 

The construction program shall consider using the soil removed from one phase for backfilling another. Suitable storage ground, gathering ground and mixing ground may be set up on-site as necessary.

 

Design / construction Planning

CEDD / Contractor

Ö

Ö

 

 

EIAO-TM Annex 10, 18

ETWB TCW 2/2004

ETWB TCW 3/2006

Table 7.6

Table 7.2

Establishment Period

 

12 month establishment period for the soft landscape works will be allowed in the main contract. Most construction contracts in Hong Kong require the Contractor to carry out routine horticultural operations, including watering, pruning, weeding, pest control, replacement of dead plants etc. to ensure healthy establishment of new planting during a 12 month establishment period.

 

This period also serves as a kind of warranty / guarantee on the quality of the plants supplied and installed by the Contractor. 

 

Work site / construction phase

CEDD / Contractor

Ö

Ö

 

 

EIAO-TM Annex 10, 18

ETWB TCW 2/2004

ETWB TCW 3/2006

Table 7.7

Table 7.3

Re-instatement of excavated Area

 

All excavated area and disturbed area for utilities diversion, temporary road diversion, and pipeline woks will be reinstated to former conditions, subject to applicable Government Standards.

 

Design / Operation phase

DSD

Ö

 

Ö

 

EIAO-TM Annex 10, 18

ETWB TCW 2/2004

ETWB TCW 3/2006

Table 7.7

Table 7.3

Architectural Treatment for the proposed structures

 

Compatible design, construction materials and surface finishes of TM54SPS should be harmony with proposed GIC development within Site 4A. (open space and 6 nos. schools development) so as to achieve visual uniformity.

Finishing materials shall have due consideration to form, basic color, color/tone variation, micro- and macro-texture, and reflectivity/light absorbance to avoid glare. 

Design / Operation phase

CEDD (Design) / DSD (Operation)

Ö

 

Ö

 

EIAO-TM Annex 10, 18

ETWB TCW 2/2004

ETWB TCW 3/2006

Table 7.7

Table 7.3

Greening for TM54SPS

 

Permeable boundary wall with tree and shrub planting (with 1.2m topsoil depth planting strip) shall be used. The tree planting (21 nos. of trees) should be in heavy standard sized (the stem diameter is exceeding 75mm but not exceeding 150mm measure at a height of 1m from the root collar) to provide early screening effect. Trees with normal standard size (the stem diameter is exceeding 45mm but not exceeding 75mm measure at a height of 1m from the root collar) (14 nos. of trees) and shrub are proposed for buffer planting.  The trees would be one or more of following species: Bauhinia blakeana, Bischofia trifoliate, Cassia surattensis, Callistemon rigidus and Magnolia grandiflora.  The shrubs would be one or more of following species: Codiaeum variegatum, Hibiscus rosa-sinensis, Jasminum sambac, Osmanthus fragrans and Rhododendron pulchrum.  One or more of the following climbers: Bauhinia glauca, Bougainvillea spectabilis, Lonicera japonica, Parthenocissus himalayana, Pyrostegia venusta and Wisteria sinensis, flowers racks or other vertical greening should be installed to soften the monolithic effects of boundary wall.  Green roof with shrub and groundcovers is proposed. 

 

 

Design / Operation phase

CEDD (Design) / DSD (Operation)

Ö

 

Ö

 

EIAO-TM Annex 10, 18

ETWB TCW 2/2004

ETWB TCW 3/2006

# All recommendations and requirements resulted during the course of EIA/EA Process, including ACE and / or accepted public comment to the proposed project.

* Des - Design, C - Construction, O – Operation, and Dec – Decommissioning


Table A6          Implementation Schedule for Cultural Heritage

EIA Ref #

Environmental Protection Measures / Mitigation Measures

Location / Timing

Implementation Agent

Implementation Stages*

Relevant Legislation and Guidelines

Des

C

O

Dec

S8.21

Site 4A of Tuen Mun Area 54 is recommended to be added to the programme of archaeological survey and rescue excavation to be undertaken by the Antiquities and Monuments Office (AMO) of LCSD for the proposed development at Tuen Mun Area 54 prior to the commencement of construction works.

 

Work site / Prior to construction phase

AMO of LCSD

Ö

 

 

 

-

# All recommendations and requirements resulted during the course of EIA/EA Process, including ACE and / or accepted public comment to the proposed project.

* Des - Design, C - Construction, O – Operation, and Dec - Decommissioning