Appendix A2
Implementation Schedule for Recommended Mitigation Measures for Designated Project Road D1
EIA Ref. |
EM&A Log Ref. |
Environmental Protection Measures |
Location / Duration of Measure / Timing of Completion of Measures |
Implementation Agent |
Implementation Stage |
Relevant Legislation & Guidelines |
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Des |
C |
O |
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CONSTRUCTION PHASE MITIGATION MEASURES |
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3.5 |
3.8 |
NOISE (Construction Phase) |
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Use of Quiet Plant |
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3.5.21 |
3.8.2 |
The use of quiet plant (also referred as silenced equipment) can provide significant reduction in noise level. Quiet plant is defined as PME whose actual sound power level is less than the value specified in TM on Noise from Construction Work other than Percussive Piling for the same piece of equipment. To allow the Contractor some flexibility to select equipment to suit his needs, it is considered too restrictive to specify which specific items of silenced equipment to be used for the construction operations. It should be noted that various types of silenced equipment can be found in Hong Kong and are readily available on the market. BS 5228 also provide examples of quiet construction plant and their sound power level. |
Site formation works for Lok Wo Sha near NSR C3 Li Po Chun United World College; Construction of Road D1 (including the two slip roads to Road T7) and local roads near NSRs C1(To Tau), C2(Wu Kai Sha), C3(Li Po Chun United World College) & C7(future Wu Kai Sha Station developmet); building construction works near NSR C6(Monte Vista) / During the whole construction period / Before start of construction works |
Construction Contractor |
ü |
TMEIA |
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Use of Movable (Mobile) Barriers |
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3.5.23 |
3.8.3 |
Movable (mobile) barriers can be used to screen NSRs from particular items of plant or noisy operations. Movable barriers of 3 to 5 m height with a small cantilevered upper portion and skid footing can be located within a few metres of stationary plant (e.g. generator, compressor) and within about 5 m or more of a mobile equipment (e.g. excavator, mobile crane), such that the line of sight to the NSR is blocked by the barriers. It would be possible for the Contractor to provide purpose-built noise barriers or screens constructed of appropriate material with a minimum superficial density of 15 kg/m2 located close to operating equipment. Certain types of stationary equipment, such as generators and compressors, can be completely screened by portable barriers giving a total noise reduction of 10 dB(A) or more. |
Construction of Road D1 (including the two slip roads to Road T7) and local roads near NSRs C1 & C3 / During the whole construction period / Before start of construction works |
Construction Contractor |
ü |
TMEIA |
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Use of Temporary Noise Screening Structures or Purpose-built Temporary Noise Barriers |
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3.5.25 |
3.8.4 |
Since some of the NSRs close to the Project area are typically low-rise village houses, it would be effective to have noise screening structures or temporary noise barriers purposely-built along the site boundary to provide additional protection to NSRs close to the construction site. This could be in the form of purposely-built site hoarding constructed from appropriate materials with a minimum superficial density of 15 kg/m2. Merely using plywood would not be effective. The noise barrier should have a vertical height of 3.5 m or above, have no gaps or opening at joints. The Contractor should regularly inspect and maintain the noise barrier to ensure its effectiveness. |
Construction of Road D1 (including the two slip roads to Road T7) and local roads near NSRs C1 & C3 / During the whole construction period / Before start of construction works |
Construction Contractor |
ü |
TMEIA |
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Good Site Practices |
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3.5.27 |
3.8.5 |
(a) Noisy equipment and activities should be sited by the Contractor as far from close-proximity sensitive receivers as practical. Prolonged operation of noisy equipment close to dwellings should be avoided. |
All construction site / During the whole construction period / Before start of construction works |
Construction Contractor |
ü |
TMEIA |
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(b) The Contractor should minimise construction noise exposure to the schools (especially during examination periods) as much as possible. The Contractor should liaise with the school and the Examination Authority to ascertain the exact dates and times of all examination periods during the course of the contract and to avoid noisy activities during these periods. |
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(c) Noisy plant or processes should be replaced by quieter alternatives where possible. Silenced diesel and gasoline generators and power units, as well as silenced and super-silenced air compressors, can be readily obtained. |
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(d) Noisy activities should be scheduled to minimise exposure of nearby sensitive receivers to high levels of construction noise. For example, noisy activities can be scheduled for midday, or at times coinciding with periods of high background noise (such as during peak traffic hours). |
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(e) Idle equipment should be turned off or throttled down. Noisy equipment should be properly maintained and used no more often than is necessary. |
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(f) The power units of non-electric stationary plant and earth-moving plant should be quietened by vibration isolation and partial or full acoustic enclosures for individual noise-generating components. |
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(g) Construction activities should be planned so that parallel operation of several sets of equipment close to a given receiver is avoided, thus reducing the cumulative impacts between operations. The numbers of operating items of powered mechanical equipment should be minimised. Noise can be reduced by increasing the distance between the operating equipment and the NSRs or by reducing the number of items of equipment and / or construction activity in the area at any one time. |
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(h) Construction plant should be properly maintained (well-greased, damage and worn parts promptly replaced) and operated. Construction equipment often has silencing measures built in or added on, e.g. bulldozer silencers, compressor panels, and mufflers. Silencing measures should be properly maintained and utilised. Where possible, rubber or damping materials should be introduced between metal panels to avoid rattle and reverberation of noise. |
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(i) Equipment known to emit sound strongly in one direction, should where possible, be oriented so that the noise is directed away from nearby NSRs. |
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(j) Material stockpiles and other structures (such as site offices) should be effectively utilised to shield construction noise. Noise can also be reduced by construction of temporary noise barriers which screen the lower floors from viewing the sites. Temporary noise barriers should be installed at active parts of construction areas where construction equipment is being operated in close proximity to NSRs. |
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(k) The Contractor should devise, arrange methods of working and carry out the works in such manner as to minimise noise impacts on the surrounding environment, and should provide experienced personnel with suitable training to ensure that these measures are implemented properly. |
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4.6 |
2.9 |
AIR QUALITY (Construction Phase) |
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4.6.13 |
2.9.1 |
Dust Mitigation Measures (i) The Contractor shall observe and comply with the Air Pollution Control Ordinance and its subsidiary regulations, particularly the Air Pollution Control (Construction Dust) Regulation. (ii) The Contractor shall undertake at all times to prevent dust nuisance as a result of his activities. Effective dust suppression measures should be employed to ensure that the air quality, at the boundary of his site and at any ASRs, complies with the Hong Kong Air Quality Objectives. |
Whole construction sites / Whole construction periods / Before start of construction works |
Construction Contractor |
ü |
Air Pollution Control Ordinance, Air Pollution Control (Construction Dust) Regulation |
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(iii) The Contractor shall ensure that there will be adequate water supply / storage for dust suppression purposes. |
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(iv) The Contractor shall frequently clean and water the site to minimize fugitive dust emissions. |
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(v) Effective water sprays shall be used during the delivery and handling of aggregate, and other similar materials, when dust is likely to be created and to dampen all stored materials during dry and windy weather. |
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(vi) Watering of exposed surfaces shall be exercised as often as possible depending on the circumstance. |
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(vii) Areas within the site where there is a regular movement of vehicles must be regularly watered. |
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(viii) Where dusty materials are being discharged to vehicle from a conveying system at a fixed transfer point, a three-sided roofed enclosure with a flexible curtain across the entry shall be provided. Exhausted fans shall be provided for this enclosure and vented to a suitable fabric filter system. |
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(ix) The Contractor shall restricted all motorized vehicles within the site, excluding those on public roads, to a maximum speed of 15 km per hour and confine haulage and delivery vehicles to designated roadways inside the site. |
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(x) Wheel washing facilities shall be installed and used by all vehicles leaving the site. No earth, mud, debris, dust and the like shall be deposited on public roads. Water in wheel cleaning facility shall be changed at frequent intervals and sediments shall be removed regularly. The Contractor shall submit detailed proposals for the wheel cleaning facilities to the Engineer prior to construction of the facility. Such wheel washing facilities shall be usable prior to any earthworks excavating activity on the site. The Contractor shall also provide a hard-surfaced road between any washing facility and the public road. |
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(xi) The Contractor shall devise, arrange methods of working and carrying out the works in such a manner so as to minimize dust impacts on the surrounding environment, and shall provide experienced personnel with suitable training to ensure that these methods are implemented. |
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(xii) All site vehicles exhausts should be directed vertically upwards or directed away from the ground. |
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(xiii) All stockpile of dusty material shall be either: (a) covered entirely by impervious sheeting; (b) placed in area sheltered on the top and the three sides; or (c) sprayed with water or a dust suppression chemical so as to maintain the entire surface wet. |
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5.4 |
4.9 |
WATER QUALITY (Construction Phase) |
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5.4.18 |
4.9.2 |
Suspended solids in runoff should be reduced by the provision of a good surface drainage system with suitably designed catchpits to retain sediment. Silt removal devices should be well-maintained. For areas where no drainage is present or prior to drainage being constructed, sediment should be collected by excavating a pit into which surface runoff is directed and where settlement and/or infiltration can occur. A mobile sedimentation tank should also be provided to reduce the SS level of the wastewater. |
Whole construction site / Whole construction phase / Before start of construction works |
Construction Contractor |
ü |
WPCO / TM on Effluents Discharged into Drainage and Sewerage Systems, Inland and Coastal Waters |
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5.4.19 |
4.9.3 |
It should be noted that Starfish Bay is a water and ecological sensitive receiver. Any construction activities close to it should be regarded as of particular concern. Silt traps should be installed and well-maintained to prevent any silty runoff from entering Starfish Bay. All wastewater generated during construction must be monitored and treated as necessary prior to discharging into the north and west shore of Whitehead. |
Whole construction site / Whole construction phase / Before start of construction works |
Construction Contractor |
ü |
WPCO / TM on Effluents Discharged into Drainage and Sewerage Systems, Inland and Coastal Waters |
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5.4.20 |
4.9.4 |
Stockpiles should be covered during wet season to avoid generating silty runoff. A surrounding drainage system and the use of flat and exposed permeable area should be provided to facilitate control and infiltration of site runoff. |
Whole construction site / Whole construction phase / Before start of construction works |
Construction Contractor |
ü |
WPCO / TM on Effluents Discharged into Drainage and Sewerage Systems, Inland and Coastal Waters |
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5.4.21 |
4.9.5 |
Site cleanliness and immediate cleanup/remedial action in case of chemical spill (such as fuel) are the most effective mitigation measures to minimize water quality impacts from general site run-off and should be adhered to in all construction sites. In addition, adequate sanitary facilities for workers on site should be provided and grease trap facilities should be installed for any canteen facilities. |
Whole construction site / Whole construction phase / Before start of construction works |
Construction Contractor |
ü |
WPCO / TM on Effluents Discharged into Drainage and Sewerage Systems, Inland and Coastal Waters |
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5.4.22 |
4.9.6 |
Concrete washings will increase pH in receiving waterbodies. Close monitoring of pH should be conducted to avoid damage to the marine ecology. Buffer agents should be added where necessary to neutralise concrete wastewaters before its discharge to stormdrains or watercourses. A particular location within the site away from any water receiver should be selected for washing the concrete mixer. Infiltration/sedimentation pits should be used to settle out washings before discharge/treatment. Bored-pile suspension should also be settled in infiltration/sedimentation pits. |
Whole construction site / Whole construction phase / Before start of construction works |
Construction Contractor |
ü |
WPCO / TM on Effluents Discharged into Drainage and Sewerage Systems, Inland and Coastal Waters |
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5.4.23 |
4.9.7 |
Oil interceptors should be installed for maintenance workshop and storage areas. These should be emptied regularly and should have a by-pass to prevent flushing during periods of heavy rain. |
Whole construction site / Whole construction phase / Before start of construction works |
Construction Contractor |
ü |
WPCO / TM on Effluents Discharged into Drainage and Sewerage Systems, Inland and Coastal Waters |
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5.4.24 |
4.9.8 |
A section of road between the wheel washing bay and the public road should be paved, with backfall, to prevent wash water or other site runoff from entering public road drains. Sand and grit from wheel washing bays should be settled out and removed before the water is discharged into storm drains. The wheel washing bay should be designed to reuse settled wheel washing water. |
Whole construction site / Whole construction phase / Before start of construction works |
Construction Contractor |
ü |
WPCO / TM on Effluents Discharged into Drainage and Sewerage Systems, Inland and Coastal Waters |
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5.4.25 |
4.9.9 |
For general construction works, mitigation measures and site practice for construction site drainage as stated in ProPECC PN 1/94 should be followed. |
Whole construction site / Whole construction phase / Before start of construction works |
Construction Contractor |
3 |
WPCO / TM on Effluents Discharged into Drainage and Sewerage Systems, Inland and Coastal Waters |
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6.8 |
N/A |
ECOLOGY (Construction Phase) |
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6.8.2 |
Impacts to woodland and plantation on site has been partially avoided by preserving a total of 7.05 ha of plantation in 5 patches of "preserved plantation" and 1.98 ha of woodland in 4 patches of "preserved woodland". These include the 2 headlands where natural understorey of plantation is gradually established and the secondary woodland along the west coast and at the knoll. |
The preserved plantation and preserved woodland as shown in the preliminary Preferred Development Option / During detailed design, construction and operation |
PlanD / LandsD / Construction Contractor / TDD / Developer / |
ü |
ü |
ü |
PELB Technical Circular 1/97, WBTC 4/97 / TMEIA |
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6.8.3 |
Loss of woodland and plantation lying on the fringe of the preserved woodland area where no earthwork is required should also be minimised as possible. |
Woodland and plantation lying on the fringe of the preserved woodland area / Whole construction phase / Before construction phase |
TDD / Developer / Detailed Design Engineer / Construction Contractor |
ü |
ü |
PELB Technical Circular 1/97, WBTC 4/97 / TMEIA |
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6.8.4 |
Mature native trees which are commercially unavailable or difficult to establish should be transplanted, where feasible. A tree survey should be performed at the detailed design stage to assess in details the overall suitability of a tree (based on conservation status, size, health, form, landscaping value, etc.) for transplantation. |
The proposed development / During detailed design and construction phase / During detailed design and construction phase |
TDD / Developer / Detailed Design Engineer / Construction Contractor |
ü |
ü |
PELB Technical Circular 1/97, WBTC 4/97 / TMEIA |
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6.8.5 |
Loss of woodland/plantation can be mitigated by extending the existing secondary woodlands. A total size of 1.87 ha comprising several areas at the east and west of the proposed development will be available for this purpose ("Extension Area of Secondary Woodland" in Figure 6.5). Native tree and shrub species should be planted in order to ensure like-to-like mitigation for the function of the woodland. |
The proposed development / During detailed design and construction phase / During detailed design and construction phase |
Developer / Detailed Design Engineer / Construction Contractor |
ü |
ü |
PELB Technical Circular 1/97, WBTC 4/97 / TMEIA |
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6.8.6 |
The two compensatory planting areas of 1.07 ha in total on government land at the southeast end of the Study Area and the proposed Botanical Garden of about 4.12 ha in size at the northern end of the development area would potentially provide space for transplanted trees. They can also provide opportunities for compensatory planting for the loss of woodland/plantation, though plantation is not a natural habitat type. Other landscape planting in Whitehead Site 1 and roadside planting within the study area could also compensate part of the plantation loss. |
The proposed development / During detailed design, construction and operation phase / During detailed design and construction phase |
TDD / Detailed Design Engineer / Construction Contractor / AFCD to carry out maintenance of compensatory planting at the 1.07 ha land for ecological mitigation purpose / LCSD to maintain the Botanical Garden and public roadside planting |
ü |
ü |
ü |
PELB Technical Circular 1/97, WBTC 4/97 / TMEIA |
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6.8.7 |
Site runoff should be desilted and re-used on-site where possible. Runoff should not be discharged into the embayed sandflat area. These measures will reduce the potential for suspended sediments, organics and other contaminants to enter the local marine environment. |
Whole construction site / Duration construction phase / Before start of construction works |
Construction Contractor |
ü |
TMEIA / WPCO |
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6.8.8 |
Coffer dam silt curtain should be deployed during subtidal construction works if necessary. Given the scale of works involved, this mitigation measure should be able to prevent sedimentation during constructions. |
Where construction works are undertaken close to the coast / Duration construction phase / Before start of construction works |
Construction Contractor |
ü |
TMEIA / WPCO |
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7.8 |
N/A |
CULTURAL HERITAGE (Construction Phase) |
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Archaeological Resources |
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7.8.9, 7.10.1 & Table 7.8.3 |
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Whole construction site / Whole construction phase |
PlanD / LandsD / Detailed Design Engineer / TDD / Developer / Construction Contractor |
ü |
ü |
Guidance Notes: Assessment of impact on sites of Cultural Heritage in Environmental Impact Assessment Studies (notes 19 21) / TMEIA |
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Built Heritage |
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7.10.2, Tables 7.9.3 & 7.9.4 |
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Whole construction site / Whole construction phase |
PlanD / TDD / Detailed Design Engineer / Construction Contractor |
ü |
ü |
Guidance Notes: Assessment of impact on sites of Cultural Heritage in Environmental Impact Assessment Studies (notes 19 21) / TMEIA |
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8.6 |
5.2 |
LANDSCAPE AND VISUAL QUALITY (Construction Phase) |
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8.6.29 - 8.6.30, Table 8.6.3 & Figure 8.21 |
Table 5.1 |
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Whole construction stage / Whole construction periods |
Detailed Design Engineer / TDD / Developer / Construction Contractor |
ü |
ü |
TMEIA |
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OPERATIONAL PHASE MITIGATION MEASURES |
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3.6 |
NOISE (Operational Phase) |
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Traffic Noise |
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N/A |
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Train Noise (MOS Rail) |
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N/A |
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Fixed Noise |
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N/A |
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4.7 |
N/A |
AIR QUALITY (Operational Phase) |
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N/A |
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5.5 |
N/A |
WATER QUALITY (Operational Phase) |
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Sewage |
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N/A |
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Stormwater Runoff |
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5.5.21 |
All stormwater runoff generated north of the Study Area should be collected and discharged at the outfalls at the northern and western coast of Whitehead. No stormwater runoff due to the development to the north of Sai Sha Road should be discharged to Starfish Bay. |
The proposed development / During operation stage of the development / Drainage system in place before operation |
TDD to provide drainage network for the proposed development / DSD to provide maintenance during operation |
ü |
ü |
WPCO / Technical Memorandum on Effluents Discharged into Drainage and Sewerage Systems, Inland and Coastal Waters |
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5.5.24 |
Impacts from stormwater runoff should be mitigated through preventative and control measures. Prevention measures include sweeping of roads, minimising the use of excessive volumes of chemicals such as bleaching and cleaning materials in buildings, controlling the use of fertilisers in parks and maintaining a clean environment through raising public awareness. |
The proposed development / During operation stage |
Developer for the proposed residential development / HyD & FEHD for public roads, footpaths & cycletracks / LSCD for recreational areas |
ü |
WPCO |
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7.8 |
N/A |
CULTURAL HERITAGE (Operational Phase) |
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Archeological Resources |
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7.8.9, 7.10.1 & Table 7.8.3 |
Fencing should be provided along the section of Road D1(N) abutting the sand bar of the prehistoric archaeological site to prevent disturbances during the operational stage phase. |
The section of Road D1(N) abutting the sand bar of the prehistoric archaeological site / Operation stage / Operation stage |
Detailed Design Engineer / TDD / Construction Contractor / HyD to provide maintenance |
ü |
ü |
ü |
Guidance Notes: Assessment of impact on sites of Cultural Heritage in Environmental Impact Assessment Studies (notes 19 21) / TMEIA |
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Built Heritage |
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7.8.9, 7.10.2 & Table 7.8.3 |
Complementary landscaping should be implemented in the vicinity of the Wu Kai Sha Village Well. |
Vicinity of the Wu Kai Sha Village Well / Operation stage / Operation stage |
Detailed Design Engineer / TDD / Construction Contractor / LCSD to provide maintenance |
ü |
ü |
ü |
Guidance Notes: Assessment of impact on sites of Cultural Heritage in Environmental Impact Assessment Studies (notes 19 21) / TMEIA |
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8.7 |
5.2 |
LANDSCAPE AND VISUAL IMPACT ASSESSMENT (Operational phase) |
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8.7.21 8.7.22, Table 8.7.3 & Figure 8.22 |
Table 5.2 |
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Whole Site / Whole operational phase |
TDD / Developer / LCSD / HyD/ Detailed Design Engineer |
ü |
ü |
TMEIA |
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Notes:
AFCD : Agriculture, Fisheries and Conservation Department
ArchSD : Architectural Services Department
DSD : Drainage Services Department
FEHD : Food and Environmental Hygiene Department
LandsD : Lands Department
LCSD : Leisure and Cultural Services Department
PlanD : Planning Department
TDD : Territory Development Department
WSD : Water Supplies Department
Des : Detailed Design Stage
C : Construction Stage
O : Operational Stage
APCO : Air Pollution Control Ordinance
NCO : Noise Control Ordinance
WPCO : Water Pollution Control Ordinance
TM : Technical Memorandum
TMEIA : Technical Memorandum on Environmental Impact Assessment Process
WBTC : Works Branch Technical Circular
N/A : Not Applicable
NSR C1 : Construction Noise Sensitive Receivers at To Tau
NSR C2 : Construction Noise Sensitive Receivers at Wu Kai Sha
NSR C3 : Construction Noise Sensitive Receivers at Li Po Chun United World College
NSR C4 : Construction Noise Sensitive Receivers at Symphony Bay
NSR C5 : Construction Noise Sensitive Receivers at Cheung Muk Tau
NSR C6 : Construction Noise Sensitive Receivers at Monte Vista
NSR C7 : Construction Noise Sensitive Receivers at future Wu Kai Sha Station
Development