3.6.1.1 2.1 General Dust Control Measures The following dust suppression measures should be implemented:
To minimize | Contractor | Construction | During | EIA Recommendation |
adverse dust | Works Sites | Construction | and Air Pollution | |
emission generated | Control (Construction | |||
from various | Dust) Regulation | |||
construction | ||||
activities of the | ||||
works sites |
The relevant best practices for dust control as stipulated in the Air Pollution Control (Construction Dust) Regulation should be adopted to further reduce the construction dust impacts of the Project. These best practices include:
Good site management
Disturbed Parts of the Roads
To minimize | Contractor | Construction | During | EIA Recommendation |
adverse dust | Works Sites | Construction | and Air Pollution | |
emission generated | Control (Construction | |||
from various | Dust) Regulation | |||
construction | ||||
activities of the | ||||
works sites |
Exposed Earth
� Exposed earth should be properly treated by compaction, hydroseeding, vegetation planting or seating with latex, vinyl, bitumen within six months after the last construction activity on the site or part of the site where the exposed earth lies.
Loading, Unloading or Transfer of Dusty Materials
� All dusty materials should be sprayed with water immediately prior to any loading or transfer operation so as to keep the dusty material wet.
Debris Handling
Transport of Dusty Materials
� Vehicle used for transporting dusty materials/spoils should be covered with tarpaulin or similar material. The cover should extend over the edges of the sides and tailboards.
Wheel washing
� Vehicle wheel washing facilities should be provided at each construction site exit. Immediately before leaving the construction site, every vehicle should be washed to remove any dusty materials from its body and wheels.
Use of vehicles
Site hoarding
� Where a site boundary adjoins a road, street, service lane or other area accessible to the public, hoarding of not less than 2.4m high from ground level should be provided along the entire length of that portion of the site boundary except for a site entrance or exit.
Blasting
� The areas within 30m from the blasting area should be wetted with water prior to blasting.
Air Quality Impact (Operation)
3.5.2.2 2.2 The following odour containment and control measures will be provided for the proposed sewage treatment work at the BCP site:
To minimize DSD BCP Operation EIA recommendation potential odour Phase impact from operation of the proposed sewage treatment work at BCP The use of movable barrier for certain PME can further alleviate the construction noise impacts. In general, a 5 dB(A) reduction for movable PME and 10 dB(A) for stationary PME can be achieved depending on the actual design of the movable noise barrier. The Contractor shall be responsible for design of the movable noise barrier with due consideration given to the size of the PME and the requirement for intercepting the line of sight between the NSRs and PME. Barrier material with surface mass in excess of 7 kg/m2 is recommended to achieve the predicted screening effect.
Noise Impact (Construction) | |||||||
---|---|---|---|---|---|---|---|
4.4.1.4 | 3.1 | Adoption of Quieter PME | To minimize the | Contractors | Construction | During | EIA recommendation, |
Use of the recommended quieter PME such as those given in the BS5228: Part 1:2009 and presented in Table 4.14, which can be found in Hong Kong. | construction airborne noise impact | Work Sites | Construction | EIAO and Noise Control Ordinance (NCO) |
To minimize the | Contractors | Construction | During | EIA recommendation, |
construction air- | Work Sites | Construction | EIAO and NCO | |
borne noise impact |
4.4.1.4 3.1 Use of Noise Enclosure/ Acoustic Shed To minimize the Contractors Construction During EIA recommendation, construction air-Work Sites Construction EIAO and NCO
The use of noise enclosure or acoustic shed is to cover stationary PME borne noise impact
such as air compressor and concrete pump. With the adoption of the noise enclosure, the PME could be completely screened, and noise reduction of 15 dB(A) can be achieved according to the GW-TM.
4.4.1.4 3.1 Use of Noise Insulating Fabric To minimize the Contractors Construction During EIA recommendation, construction air-Work Sites Construction EIAO and NCO
Noise insulating fabric can be adopted for certain PME (e.g. drill rig, borne noise impact
pilling auger etc). The insulating fabric should be lapped such that there are no openings or gaps on the joints. Technical data from manufacturers state that by using the Fabric, a noise reduction of over 10 dB(A) can be achieved on noise level.
The good site practices listed below should be followed during each phase of construction:
To minimize the | Contractors | Construction | During | EIA recommendation, |
construction air- | Work Sites | Construction | EIAO and NCO | |
borne noise impact |
Noise Impact (Operation) Road Traffic Noise | ||||||||
---|---|---|---|---|---|---|---|---|
Table 4.42 and Figure 4.20.1 to 4.20.4 | 3.2 | Erection of noise barrier/ enclosure along the viaduct section. | To minimize the road traffic noise along the connecting road of BCP | Contractor | Loi Tung and Fanling Highway Interchange | Before Operation | EIAO and NCO | |
Fixed Plant Noise | ||||||||
Table 4.46 | 3.2 | Specification of the maximum allowable sound power levels of the proposed fixed plants during daytime and night-time. | To minimize the fixed plant noise impact | Managing Authority of the buildings / Contractor | BCP, Administration Building and all ventilation buildings | Before Operation | EIA recommendation, EIAO and NCO |
4.5.2.4 3.2 The following noise reduction measures shall be considered as far as practicable during operation:
To minimize the | Managing | BCP, | Before | EIAO and NCO |
fixed plant noise | Authority of | Administration | Operation | |
impact | the buildings / | Building and all | ||
Contractor | ventilation | |||
buildings |
Water Quality Impact (Construction)
The site practices outlined in ProPECC Note PN 1/94 should be followed as far as practicable in order to minimise surface runoff and the chance of erosion. The following measures are recommended to protect water quality and when properly implemented should be sufficient to adequately control site discharges so as to avoid water quality impacts:
To control site | Contractor | Construction | Construction | Practice Note for |
runoff and | Works Sites | Phase | Professional Persons | |
drainage; prevent | on Construction Site | |||
high sediment | Drainage (ProPECC | |||
loading from | Note PN 1/94) | |||
reaching the | ||||
nearby | ||||
watercourses |
Temporary ditches should be provided to facilitate the runoff discharge into stormwater drainage system through a sediment/silt trap. The sediment/silt traps should be incorporated in the permanent drainage channels to enhance deposition rates, if practical.
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 TM standards under the WPCO. The design of efficient silt removal facilities should be based on the guidelines in Appendix A1 of ProPECC Note PN 1/94. Sizes may vary depending upon the flow rate. The detailed design of the sand/silt traps should 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. If excavation of trenches in wet periods is necessary, they should be dug and backfilled in short sections wherever practicable. 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 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 Note PN 1/94.
The overall slope of the site should be kept to a minimum to reduce
the erosive potential of surface water flows. | |
� | 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 construction site exit where practicable. Wash-water should have sand and silt settled out and removed regularly 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 should be covered with tarpaulin or similar fabric during rainstorms. Measures should be taken to prevent the washing away of construction materials, soil, silt or debris into any drainage |
system. | |
� | Manholes (including newly constructed ones) should be adequately covered and temporarily sealed so as to prevent silt, construction materials or debris being washed into the drainage system and stormwater runoff being directed into foul sewers. |
� | Precautions should be taken at any time of the year when rainstorms are likely. Actions should be taken when a rainstorm is imminent or forecasted and actions to be taken during or after rainstorms are summarized in Appendix A2 of ProPECC Note PN 1/94. Particular attention should be paid to the control of silty surface runoff during storm events, especially for areas located near steep slopes. |
� | Bentonite slurries used in piling or slurry walling should be reconditioned and reused wherever practicable. Temporary enclosed storage locations should be provided on-site for any unused bentonite that needs to be transported away after all the related construction activities are completed. The requirements in ProPECC Note PN 1/94 should be adhered to in the handling and disposal of bentonite slurries. |
5.6.1.1 4.1 GoThca | od site practices for works within water gathering grounds e following conditions should be complied, if there is any works to be rried out within the water gathering grounds: To minimize water quality impacts to the water gathering grounds Contractor Construction Works Sites within the water gathering Construction Phase ProPECC Note PN 1/94 |
grounds
Water Supplies.
Construction solid waste, debris and refuse generated on-site should be collected, handled and disposed of properly to avoid entering any nearby stormwater drain. Stockpiles of cement and other construction materials should be kept covered when not being used.
Oils and fuels should only be stored in designated areas which have pollution prevention facilities. To prevent spillage of fuels and solvents to any nearby stormwater drain, 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. The bund should be drained of rainwater after a rain event.
To minimize water Contractor All construction Construction EIA Recommendation quality impacts works sites phase
5.6.1.3 4.1 Sewage effluent from construction workforce To minimize water Contractor All construction Construction EIA Recommendation quality impacts works sites with phase and Water Pollution
Temporary sanitary facilities, such as portable chemical toilets, should
on-site sanitary Control Ordinance be employed on-site where necessary to handle sewage from the
facilities (WPCO)
workforce. A licensed contractor should be employed to provide appropriate and adequate portable toilets and be responsible for appropriate disposal and maintenance.
5.6.1.4 4.1 Hydrogeological Impact To minimize water Contractor Construction Construction EIA Recommendation quality impacts works sites of phase and WPCO
Grout injection works would be conducted before blasting, for sealing a the drill and limited area around the tunnel with a grout of a suitable strength for blast tunnel
controlling the potential groundwater inflows. The pre-injection grouting method would be supplemented by post-injection grouting where necessary to further enhance the groundwater inflow control. On-site treatment for the groundwater ingress pumped out would be required to remove any contamination by grouting materials before discharge off-site.
Water Quality Impact (Operation)
No mitigation measure is required.
Sewage and Sewerage Treatment Impact (Construction)
6.7 | 5 | The sewage generated by the on-site workforce should be collected in chemical toilets and disposed of off-site by a licensed waste collector. | To minimize water quality impacts | Contractor | All construction works sites with on-site sanitary facilities | Construction phase | EIA recommendation and WPCO | |
---|---|---|---|---|---|---|---|---|
Sewage and Sewerage Treatment Impact (Operation) | ||||||||
6.6.3 | 5 | Sewage generated by the BCP and Chuk Yuen Village Resite will be collected and treated by the proposed on-site sewage treatment facility using Membrane Bioreactor treatment with a portion of the treated wastewater reused for irrigation and flushing within the BCP. | To minimize water quality impacts | DSD | BCP | Operation phase | EIA recommendation and WPCO | |
6.5.3 | 5 | Sewage generated from the Administration Building will be discharged to the existing local sewerage system. | To minimize water quality impacts | DSD | Administration Building | Operation phase | EIA recommendation and WPCO |
Waste Management Implication (Construction) | ||||||
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7.6.1.1 | 6 | Good Site Practices | To minimize | Construction | Construction | EIA recommendation; |
Adverse impacts related to waste management such as potential hazard, air, odour, noise, wastewater discharge and public transport as mentioned in section 3.4.7.2 (ii)(c) of the Study Brief are not expected to arise, provided that good site practices are strictly followed. 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 | adverse environmental impact | works sites (general) | Phase | Waste Disposal Ordinance; Waste Disposal (Chemical Wastes) (General) Regulation; and ETWB TC(W) No. 19/2005, Environmental Management on Construction Site | ||
� Training of site personnel in proper waste management and chemical handling procedures | ||||||
� Provision of sufficient waste disposal points and regular collection of waste | ||||||
� Dust suppression measures as required under the Air Pollution Control (Construction Dust) Regulation should be followed as far as practicable. Appropriate measures to minimise windblown litter and dust/odour during transportation of waste by covering trucks or in enclosed containers | ||||||
� General refuse shall be removed away immediately for disposal. As |
such odour is not anticipated to be an issue to distant sensitive
receivers
7.6.1.2 | 6 | Waste Reduction Measures | To reduce the | Contractor | Construction | Construction | EIA recommendation |
Good management and control can prevent the generation of a significant amount of waste. Waste reduction is best achieved at the | quantity of wastes | works sites (General) | Phase | and Waste Disposal Ordinance | |||
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 |
7.6.1.3 7.6.1.4 | 6 6 | of waste generated and avoid unnecessary generation of waste � In addition to the above measures, specific mitigation measures are recommended below for the identified waste arising to minimise environmental impacts during handling, transportation and disposal of these wastes. C&D Materials In order to minimise impacts resulting from collection and transportation of C&D material for off-site disposal, the excavated materials should be reused on-site as backfilling material as far as practicable. The surplus rock and other inert C&D material would be disposed of at the Government’s Public Fill Reception Facilities (PFRFs) at Tuen Mun Area 38 for beneficial use by other projects in the HKSAR as the last resort. C&D waste generated from general site clearance and tree felling works would require disposal to the designated landfill site. Other mitigation requirements are listed below: � A Waste Management Plan should be prepared and implemented in accordance with ETWB TC(W) No. 19/2005 Environmental Management on Construction Site; and � In order to monitor the disposal of C&D material and solid wastes at public filling facilities and landfills, and to control fly-tipping, a trip-ticket system (e.g. ETWB TCW No. 31/2004) should be included. General refuse General refuse should be stored in enclosed bins or compaction units separated from other C&D material. A reputable waste collector is to be employed by the Contractor to remove general refuse from the site separately. Preferably an enclosed and covered area should be provided to reduce the occurrence of 'wind blown' litter. | To minimize impacts resulting from C&D material To minimize impacts resulting from collection and transportation of general refuse for off-site disposal | Contractor Contractor | Construction Works Sites (General) Construction works sites (General) | Construction Phase Construction phase | EIA recommendation; Waste Disposal Ordinance; and ETWB TCW No. 31/2004 Waste Disposal Ordinance and Public Health and Municipal Services Ordinance Public Cleansing and Prevention of Nuisances Regulation |
7.6.1.5 | 6 | Chemical waste If chemical wastes are produced at the construction site, the Contractor will 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 | To minimize impacts resulting from collection and transportation of chemical waste for off-site disposal | Contractor | Construction works sites (General) | Construction phase | Waste Disposal (Chemical Waste) (General) Regulation and Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes |