Contents
2.1 General Description of the Project
2.2 Background and History of the Project
2.3 Environmental Benefits of the Project
3 SUMMARY OF
ENVIRONMENTAL IMPACT ASSESSMENT
3.1 Approach to Environmental Impact Assessment
3.5 Waste Management Implications
3.10 Environmental Monitoring and Audit
Figure 2.1
Location
of the Project
Figure 2.2
General
Arrangement of Pedestrian Interchange (Sheet 1 of 2)
Figure 2.3
General
Arrangement of Pedestrian Interchange (Sheet 2 of 2)
1.1.1.1
This Executive Summary summarizes the
results of the Environmental Impact Assessment (EIA) for Elevated Pedestrian
Corridor in Yuen Long Town Connecting with Long Ping Station – Investigation,
Design and Construction Project. The EIA has been prepared in accordance with the
requirements of the Environmental Impact Assessment Ordinance (EIAO) and the
EIA Study Brief (ESB-278/2014).
1.2.1.1
Over the years, with the completion of
major infrastructure improvements including Light Rail Transit (LRT) in late
80s, the operation of Tai Lam Tunnel in 1998 and the West Rail Service in 2003,
Yuen Long has been experiencing substantial changes. Rapid growth in major residential
developments and large scale integrated developments in Yuen Long Town and its
surrounding areas was observed in recent years. These new developments and
growing population have further exacerbated the congestion problem in Yuen Long
Town and have resulted in surging demand for safe and convenient pedestrian
facilities. Inadequate pedestrian facilities are long-standing problems in the
town centre of Yuen Long. However, improvements have been constrained by the
existing urban characteristics such as the presence of LRT, narrow footpaths
along Castle Peak Road - Yuen Long Section.
1.2.1.2
The Chief Executive has pledged in his 2008-2009 Policy Address to
improve the pedestrian environment in business districts, shopping centres and
leisure areas with heavy pedestrian flows as to minimize vehicle-pedestrian
conflicts and improve roadside air quality. Amongst other areas with heavy
pedestrian flows, Yuen Long Town is selected as one of the key locations.
1.2.1.3
The first public engagement for developing pedestrian environmental
improvement schemes commenced in 2009 and the proposed elevated pedestrian
corridor was presented to Yuen Long District Council Meeting in 2010.
1.2.1.4
In September 2011, Highway Department
(HyD) commissioned a Feasibility Study (FS) on the major improvement schemes
including the proposed elevated pedestrian corridor, which in form of a
footbridge, along Yuen Long Town Nullah connecting with West Rail Long Ping
Station (WRLPS). A public engagement was conducted in March and April 2013 to
consult the public on the preliminary proposals for the major improvement
schemes formulated in the FS. The public and Yuen Long District Council
expressed support for the proposed footbridge and urged its early
implementation.
1.2.1.5
The Technical Feasibility
Statement (TFS) prepared by HyD for the proposed elevated pedestrian corridor
along Yuen Long Town Nullah between WRLPS and Kau Yuk Road with provision for
future extension was approved by the Development Bureau in July 2013. The
findings of the above FS and the TFS set out the basis for the current proposal
for the proposed elevated pedestrian corridor under the Project.
1.3.1.1 The Project involves construction of an elevated pedestrian corridor of about 540m in length and 6m clear width footbridge along Yuen Long Town Nullah and six pedestrian interchanges. It would also require the construction of pile foundation for the footbridge and box structure on piles for the pedestrian interchanges within the Yuen Long Town Nullah.
1.3.1.2 The Project involves construction works at the Yuen Long Town Nullah which eventually discharges into the Mai Po Marshes, a Site of Special Scientific Interest (SSSI). Hence, the Project is classified as a Designated Project (DP) under Item I.1(b)(i) under Part I of the Schedule 2 of the EIAO - A drainage channel or river training and diversion works which discharges or discharge into an area which is less than 300m from the nearest boundary of an existing or planned site of special scientific interest. Therefore, a detailed EIA for approval by the Director of Environmental Protection (DEP) is therefore required to apply the environmental permit (EP) for the construction and operation of the Project.
1.4.1.1 In accordance with the requirement of Section 5(1) of the Environmental Impact Assessment Ordinance (EIAO) (Cap. 499), a Project Profile (PP-514/2014) for the Project was submitted to the Director of Environmental Protection (DEP) for application for an EIA Study Brief in August 2014. Pursuant to Section 5(7)(a) of the EIAO, DEP issued an EIA Study Brief (ESB-278/2014) in September 2014 for this EIA Study.
1.4.1.2 The purpose of this EIA Study Brief is to set out the purposes and objectives of the EIA study, the scope of environmental issues which shall be addressed, the requirements that the EIA study shall need to fulfil, and the necessary procedural and reporting requirements. The Applicant shall demonstrate in the EIA report that the criteria in the relevant sections of the Technical Memorandum on Environmental Impact Assessment Process of EIAO (TM-EIAO) are complied with.
2.1
General Description of the Project
2.1.1.1
The proposed elevated pedestrian corridor
is located in the vicinity of Yuen Long Town Nullah. Its alignment would generally follow the
nullah, and connects West Rail Long Ping Station to the south of the Kau Yuk Road.
The proposed elevated pedestrian corridor will be in form of a footbridge and
will be connected to at-grade footpath via a total of six pedestrian
interchanges (comprising staircases / lifts / escalators) located along both
sides of the nullah. The location and layout of the Project is shown in
Figure 2.1.
2.1.1.2 As described in the EIA Report, the scope of the Project includes:
·
construction of a covered footbridge of about 540m
in length and 6m clear width with staircases / lifts / escalators along Yuen
Long Town Nullah from West Rail
Long Ping Station to the south of the Kau Yuk Road;
·
connection of the footbridge with West Rail Long
Ping Station;
·
connection of the footbridge with at-grade footways
in Yuen Long On Ling Road, Castle Peak Road – Yuen Long Section and Kau Yuk
Road;
·
provision at the southern end of the footbridge to
allow for future extension;
·
measures for mitigating drainage impact for the
sections of Yuen Long Town Nullah underneath the footbridge;
·
landscaping and streetscape works of the footpaths
along both sides of Yuen Long Town Nullah between West Rail Long Ping Station and Kau
Yuk Road; and
·
associated civil, road, drainage, geotechnical,
traffic aids, utility, diversion street lighting, landscaping, E&M works
and environmental mitigation measures and temporary traffic arrangement during
construction stage.
2.1.1.3 The proposed elevated pedestrian corridor will be connected to the footways on both sides of Yuen Long On Ning Road, Castle Peak Road – Yuen Long Section and Kau Yuk Road through six pedestrian interchanges to be constructed on the northern and southern sides of these roads along the three existing vehicular bridges supporting the sections of these road across nullah. Each pedestrian interchange will consist of a box structure on pile foundation and will be equipped with staircase, escalator and lift for connection with the deck of the footbridge. Plantation areas would also be included within these pedestrian interchanges. The schematic arrangement of these six pedestrian interchanges are shown in Figure 2.2 and Figure 2.3. Other than the pedestrian interchanges, the proposed footbridge will also be designed to have four viewing platforms which would allow the pedestrians to enjoy the views along the corridor.
2.2
Background and History of the Project
2.2.1
General Increase in
Population in Yuen Long District
2.2.1.1 As mentioned in Section 1.2, there are numbers of residential and commercial developments in Yuen Long over the last decades, especially in the vicinity of Yuen Long Town. Currently, there is a total of 16 public housing estates, Yuen Long Industrial Estate, and many private developments and villages etc., in Yuen Long District. While these developments have contributed to the urban transformation and economic vibrancy of the district as a whole, the population within Yuen Long District has also experienced a rapid growth.
2.2.1.2 According to the Population Census in Year 2011, the population in Yuen Long District has increased from 449,070 in Year 2001 to 578,529 in Year 2011, which is equivalent to approximately a 29% increase within 10 years. When compared to other Districts, Yuen Long District is one of those districts that has been experiencing a rapid growth in population.
2.2.2
Traffic Congestion in Yuen
Long Town Centre
2.2.2.1 All the existing and new population would inevitably generate traffic that would commute within the district or travel to other districts as necessary. For those commuting within the district, Yuen Long Town Centre is one of the mostly visited area where most of the commercial activities are located (e.g. along Yuen Long On Ning Road, Castle Peak Road – Yuen Long Section, etc), and where the West Rail Long Ping Station is also located. Other than road-based traffic, the existing and new population would also generate significant pedestrian movements at road levels. The traffic flow and pedestrian flow are much higher especially during morning and afternoon peaks, and public holidays.
2.2.2.2 Given the existing issue on road-based traffic and pedestrian movements, it would be beneficial to have a convenient north-south pedestrian corridor connecting West Rail Long Ping Station to Yuen Long Town Centre, which would help reducing the needs of the road-based traffic by encouraging the use of West Rail and improving the pedestrian condition by diverting pedestrian flow from at-grade footpath to the proposed elevated pedestrian corridor.
2.2.3
Existing Constraints in Yuen
Long Town Centre
2.2.3.1 As the Yuen Long Town Centre has been developed for decades, some sections of the existing infrastructures such as roads, footpaths and pedestrian crossing facilities may be facing issues in handling the current circumstances. As a result, issues on traffic congestion and vehicle-pedestrian conflicts within the Yuen Long Town Centre have been identified and discussed in Yuen Long District Council (DC).
2.2.3.2 During meetings of Yuen Long DC in recent years (e.g. 7th DC meeting in Year 2012, 2nd DC meeting in Year 2013, 2nd DC meeting in Year 2014, etc), many DC members agreed that there were serious traffic congestion and vehicle-pedestrian conflicts problem within Yuen Long Town Centre. The circumstances were more serious at Castle Peak Road – Yuen Long Section and Kau Yuk Road, as well as footpaths along them, especially during peak hours, weekends and public holidays. The existing relatively narrow footpaths (e.g. Castle Peak Road, Kau Yuk Road, Yuen Long On Ning Road, etc) were not capable to cope with the high pedestrian flow and hence resulting in safety concern, especially for those requiring special considerations including the elderly, wheelchair users and baby cart users etc. For example, there are about 10 bus stops and LRT stations located long the Castle Peak Road – Yuen Long Road. During the peak hour, the passengers of the buses or shuttle buses have occupied certain space of the existing narrow footpaths and causing blockages of the footpaths. Similarly, there are numbers of schools within Yuen Long Town Centre. Narrow footpaths near the schools are occupied by the students during peak hour and thus blockage of footpaths were observed.
2.2.3.3 Besides, Yuen Long Town Centre has been already developed with numbers of residential buildings in high density. Hence, there is limited space for widening the footpaths unless expanding towards the roads. In fact, expanding the footpaths toward the roads will further execrate the existing traffic congestion problem.
2.2.4
Public Supports
2.2.4.1
The Chief Executive has pledged in his 2008-2009 Policy Address to
improve the pedestrian environment in business districts, shopping centres and
leisure areas with heavy pedestrian flows as to minimize vehicle-pedestrian
conflicts and improve roadside air quality. Amongst other areas with heavy pedestrian
flows, Yuen Long Town is selected as one of the key locations.
2.2.4.2
The first public engagement for developing pedestrian environmental
improvement schemes was commenced in 2009 and the proposed elevated pedestrian
corridor was presented to Yuen Long District Council Meeting in 2010.
2.2.4.3
Subsequently, HyD commissioned
a Feasibility Study (FS) “CE 4/2011 (HY)
- Improvements to Pedestrian Environment in Yuen Long Town” which
recommended a number of improvement schemes to formulate potential solutions to
the vehicle-pedestrian conflicts issues. The FS recommended an elevated pedestrian corridor along Yuen Long Town
Nullah connecting with the West Rail Long Ping Station.
2.2.4.4
During the public engagement conducted in March and April 2013, the
public and Yuen Long DC expressed support for the proposed elevated pedestrian
corridor and urged its early implementation. In addition, some DC members have
requested early implementation of the proposed an elevated pedestrian corridor
during the first special meeting of Traffic and Transport Committee under Yuen
Long DC (DC Paper No. 65/2013).
2.2.5
Purposes of the Proposed
Elevated Pedestrian Corridor Connecting to Long Ping Station
2.2.5.1
The key purpose of the proposed elevated pedestrian corridor are to 1)
provide a north-south pedestrian corridor within Yuen Long Town Centre to
divert the pedestrian flow from the ground level footpaths; 2) provide a
convenient access to the West Rail Long Ping Station with ancillary facilities
(e.g. elevators); and 3) act as a convenient pedestrian crossing facilities
across busy roads within Yuen Long Town Centre.
2.2.5.2
After completion of the Project, this will help relieving the traffic
and pedestrian congestion situation at ground level as well as minimizing
vehicle-pedestrian conflicts, hence significantly improve the walking
environment in the area.
2.3
Environmental Benefits of the Project
2.3.1
Minimizing the Potential
Nuisance from Vehicular Emission and Noise on the Pedestrian
2.3.1.1 The Project can minimize the potential nuisance from vehicular emission and noise by providing an alternative access connecting the West Rail Long Ping Station and the southern part of the Yuen Long Town Centre, such as residential buildings and schools along Kau Yuk Road and Castle Peak Road – Yuen Long Section. Besides, it could alleviate the existing conflicts between pedestrians and vehicles.
2.3.1.2 Under the current situation, there are three major existing north-south pedestrian routes in Yuen Long Town Centre from Kau Yuk Road to West Rail Long Ping Station, including (1) along Hong Lok Road and eastern side of the nullah, (2) along Kik Yeung Road and western side of the nullah, and (3) along Fung Nin Road, On Shun Street and Chun Yin Square. According to the latest traffic study, the footpaths across Castle Peak Road - Yuen Long Section and Kau Yuk Road are the busiest sections of these three pedestrian routes. The estimated maximum pedestrian flow of these sections ranged from about 1750 to 7310 per hour in Year 2022. With the proposed elevated pedestrian corridor, the maximum pedestrian flow of these three pedestrian routes would be reduced to about 760 to 4,640 per hour. Over 50% of the pedestrian flow at most of those sections at the north-south at-grade pedestrian routes will be diverted to the proposed elevated pedestrian corridor. The Project can therefore minimize the potential nuisance from vehicular emission and noise by diverting pedestrian on the at-grade footpaths to the proposed elevated pedestrian corridor.
2.3.2
Enhanced Visual and Landscape
Resources at Street Level
2.3.2.1
The existing Yuen Long Nullah is a view corridor in north-south
direction and is a visual resource within Yuen Long Town Centre. However, the visual amenity of the existing
nullah is generally less satisfactory due to the hard concrete surface and
channelization.
2.3.2.2
As part of this Project, landscape and streetscape works will be
conducted at the footpaths along both side of Yuen Long Town Nullah between
West Rail Long Ping Station and Kau Yuk Road. With the provision of these
landscape and streetscape works, the visual and landscape resources along the
nullah at the street level will be enhanced and provide beneficial visual
impact to the pedestrians.
2.4.1.1
As discussed in Section 2.2.1,
there has been a significant increase in various developments in the vicinity
of Yuen Long Town Centre and the situation would likely to continue. This has
increased both road-based traffic and pedestrian flow within the district. The
existing traffic congestion and vehicle-pedestrian conflicts within Yuen Long
Town Centre will be further exacerbated if there is no improvement works.
2.4.1.2
If the Project is not implemented, the pedestrian will need to access
the West Rail Long Ping Station by crossing numbers of busy roads. Due to the
increased pedestrian at the ground level and road traffic activities, the
congestion problem and vehicle-pedestrian conflicts in the area would continue
and cause safety concern. Besides, the
pedestrian will not be able to enjoy the benefits of using the elevated
corridor which is further away from the roads and hence less nuisance caused by
the noise and emission from road based vehicles.
2.4.1.3
Furthermore, the degree of convenience to access the West Rail Long Ping
Station will also affect the choice of transportation method. If the Project is
not implemented, the pedestrian will need to cross numbers of roads and hence
spend more time before arriving the train station. As a result, some of the
local residents, especially those living to the south of the Castle Peak Road –
Yuen Long Section may choose other transportation modes rather than the more
environmental railway system. This increase in road-based traffic will
contribute to the traffic congestion problem and associated environmental
nuisance in the area.
2.4.1.4
To summarise, the “Without-project” option is not preferred due to the
consideration of the environmental impacts associated with the traffic
congestion problems and pedestrian safety issues associated with
vehicle-pedestrian conflicts.
2.5.1.1 The construction of the elevated pedestrian corridor and associated works is anticipated to commence in 2018 for completion in Year 2022. It is anticipated that the development will be commissioned in phases. In order to main sufficient capacity for the passage of flow over the entire nullah during construction phase, the construction activities at the eastern side, central part and western side of the nullah would be conducted separately to minimize the potential hydraulic impact. The tentative implementation programme is summarised in Table 2.1 below.
Table 2.1 Summary of the tentative implementation programme
Construction Activities |
Tentative Implementation Programme |
Site Clearance (Eastern Side of the nullah) |
Q1 2018 |
Site Clearance (Western Side of the nullah) |
Q2 2019 |
Temporary Erection (Eastern Side of the nullah) |
Q2 2018 to Q4 2018 |
Temporary Erection (Western Side of the nullah) |
Q2 2019 to Q4 2019 |
Temporary Erection (Central part of the nullah) |
Q4 2020 |
Piling Works (Eastern Side of the nullah) |
Q4 2018 to Q1 2019 |
Piling Works (Western Side of the nullah) |
Q4 2019 to Q1 2020 |
Piling Works (Central part of the nullah) |
Q4 2020 to Q1 2021 |
Column and Table Top Construction |
Q2 2020 to Q4 2020 |
Pedestrian Interchanges Superstructure
Construction |
Q2 2020 to Q1 2021 |
Deck Structure and Steel Works |
Q2 2020 to Q4 2021 |
Parapet Wall Construction, and Associated Landscape and Streetscape
Works |
Q4 2021 to Q2 2022 |
3.1
Approach to Environmental Impact
Assessment
3.1.1.1
The EIA process provides a means of
identifying, assessing and reporting the environmental impacts and benefits of
the project. It is an iterative process that has been followed in parallel with
the design process to identify the potential environmental effects of various
design option, and develop alternatives as well as mitigations measures to be
incorporated into the design, construction and operation of the Project.
Feedback and advice obtained from the various stakeholder engagement activities
have been suitably considered and incorporated into the EIA process where
appropriate. Mitigation measures have been proposed to avoid some potential
environmental impacts, or to minimize or mitigate to acceptable levels.
3.2.1
Introduction
3.2.1.1
Potential air quality associated with the
construction and operational phases of the project have been assessed in
accordance with the criteria and guidelines as stated in the requirements given
in Section 3.4.1 of the EIA Study Brief as well as Section 1 of Annex 4 and
Annex 12 of the TM-EIAO.
3.2.2
Construction Phase
3.2.2.1
Construction dust is the key pollutant
during the construction phase of the Project which would be generated from
various construction works, including site clearance, temporary erection and
piling works, and wind erosion of the Site. Given that the construction
works will be confined within small works areas scattered along the length of
the proposed elevated pedestrian corridor of about 540m and the construction
activities will be undertaken at moving multiple work fronts, no
significant dust emission will
be generated from the Project during the construction works. In addition, majority of the construction works with potential dust
generation will be conducted within the Yuen Long Town Nullah that is about 4m
to 5m lower than the ground level of the surrounding ASRs. Hence, significant
dust dispersion from the work area to the ASRs is also considered unlikely.
Therefore, adverse construction dust impact is not anticipated from the
Project.
3.2.2.2
For fuel combustion equipment, the emission from the PMEs is considered
relatively small and will not cause adverse air quality impact due to the
implementation of Air Pollution Control (Non-road Mobile Machinery) (Emission)
Regulation on 1 June 2015 that only approved or exempted non-road machinery are
allowed to be used in construction sites.
3.2.2.3
For construction vehicles, there would be in total of not more than
10 trips per hour and the vehicles would leave the site through two different
vehicles exits (one located near Tai Shu Ha Road West and one located near Wang
Lok Street). The emissions from construction vehicles are considered relatively
small and will not cause adverse air quality impact.
3.2.2.4
No adverse odour impact is anticipated as
there would be very small quantity of sediment generated and stored on-site
simultaneously. Nevertheless, odour control measures are recommended in Section
4.4.3 of the EIA report to minimize the potential odour emission from the
Project.
3.2.3
Operational Phase
3.2.3.1
The
Project is an elevated pedestrian corridor with associated infrastructures. There
will be no air pollutants and odour emission during operation of the Project.
Therefore, adverse cumulative air quality impact is not anticipated.
3.3.1
Introduction
3.3.1.1
Potential noise impacts associated with
the construction and operational phase of the project have been assessed in
accordance with the criteria and guidelines as stated in the requirements given
in Section 3.4.2 and Appendix B of the EIA Study Brief, as well as Annex 5 and
Annex 13 of the TM-EIAO.
3.3.2
Construction Airborne Noise
3.3.2.1
Potential construction airborne noise
impact would be caused by various construction activities including site
clearance, temporary erection, piling works, column and table top construction,
superstructure and steelworks, parapet
wall construction, and associated landscape and streetscape works.
3.3.2.2
Construction airborne noise assessment has
been conducted to evaluate the noise impact during the construction phase.
Based on the assessment results, the unmitigated construction airborne noise
would exceed the noise criteria at some existing and planned Noise Sensitive
Receivers (NSRs). A package of noise mitigation measures such as good site
practices, use of quiet plant and working methods, use of shrouds / temporary
noise barriers and enclosures to screen noise from relatively static powered
mechanical equipment (PME), scheduling of construction works outside
examination periods in critical area, alternative use of plant items within one
worksite have therefore been proposed to mitigate construction airborne noise
impacts. The assessment results indicate that, with the implementation of the
above mitigation measures and good site practices, all NSRs including
residential premises and would comply with the stipulated noise criterion.
Therefore adverse construction airborne noise is not anticipated.
3.3.3
Construction Groundborne
Noise
3.3.3.1 Piling rigs would be used in the Project instead of percussive piling. In addition, no drilling, blasting or Tunnel Boring Machine will be employed during the construction works. Hence, no adverse construction groundborne noise impact is anticipated during the construction phase.
3.3.4
Operational Noise
3.3.4.1
The
Project is an elevated pedestrian corridor with associated infrastructures.
There will be no major noise sources during operation of the Project.
Therefore, adverse cumulative noise impact is not anticipated.
3.4.1
Introduction
3.4.1.1
Potential water quality impacts associated
with the construction and operational phase of the project have been assessed
in accordance with the criteria and guidelines as stated in the requirements
given in Section 3.4.3 and Appendix C of the EIA Study Brief, as well as Annex
6 and Annex 14 of the TM-EIAO.
3.4.2
Construction Phase
3.4.2.1
Potential water quality impacts would
arise from construction activities within Yuen Long Town Nullah (e.g.
excavation, piling, construction of pile cap, etc), construction surface runoff
(including accidental chemical spillage) and sewage from site workforce. Mitigation measures, such as implementation
of the temporary cofferdams, use of portable chemical toilets, sewage holding
tank, avoidance of stockpiling materials near the dry
weather flow channel, avoidance of major excavation during high stream flow, etc.,
will be implemented on site to mitigate the potential water quality impact.
Best management practice as stipulated in the Practice for Professional Persons
on Construction Site Drainage, Environmental Projection Department, (ProPECC PN
1/94) should be followed. An emergency contingency plan would also be prepared
by the Contractor to state the details of actions in case there is accidental
spillage of chemicals or leakage of polluting water into the nullah. This
emergency contingency plan should be prepared prior to the commencement of
construction works and submitted to IEC, Engineer and EPD for
approval. With the full implementation of the mitigation measures recommended
in Section 6.6 of the EIA report, no adverse impacts are anticipated.
3.4.2.2
Cofferdams
and temporary platform will be constructed during construction of columns and
box culverts to prevent release of the suspended solid and other pollutants
into the nullah water. The construction activities at
the eastern side, central part and western side of the nullah would be
conducted separately to minimize the potential hydraulic impact in order to
main sufficient capacity for the passage of flow over the entire nullah during
construction phase. Since the
construction works and use of cofferdams will be implemented in phases, not all
the cofferdams would be in place concurrently. Besides, the construction works within the nullah
would be conducted during the dry seasons. The Contractor would be
requested to carry out detail design of the cofferdams in accordance with the
DSD Technical Circular No. 14/2000 “Temporary Flow Diversions and Temporary
Works Affecting Capacity in Stormwater Drainage System” and DSD Practice Note
No. 1/2004 “Design Rainfall Depth for Temporary Works within the Dry Season” to
avoid adverse impact on the drainage characteristics of the nullah. This arrangement will
ensure that the impacts on the hydrology and water quality of the nullah would
be insignificant. Therefore, no
adverse impact is anticipated.
3.4.3
Operational Phase
3.4.3.1
The surface runoff from the elevated
pedestrian corridor may contain grit, oil and debris from the pedestrians.
Proper drainage system including gratings at the gully inlets will be provided
to remove grit and debris before the runoff discharge to the public storm water
drainage system or the Yuen Long Town Nullah. With such implementation, no
adverse water quality impact is anticipated.
3.4.3.2
There are 2 footbridge columns and a total of 6 box culverts at the
pedestrian interchanges will be located within the nullah which will reduce the
volume of the nullah by about 720 m3 (i.e. 1.3%) for the section
under the elevated pedestrian corridor. As these permanent structures will
decrease the cross-section area of the nullah, the water level of the nullah
will be increased, especially during high flow conditions. Therefore,
mitigation measures, such as construction of parapet wall,
use of lens-shaped footbridge column to reduce head loss, etc., will be required to
mitigate the flood risk generated by the Project. With the recommended
mitigation measure in Section 6.7 of the EIA report, the flood risk can be
mitigated to acceptable level and adverse water quality impact is therefore not
anticipated.
3.5
Waste Management Implications
3.5.1
Introduction
3.5.1.1
The types of waste that would be generated
during the construction and operation phases of the project have been
identified. The potential environmental impacts that may results from these
waste materials have been assessed in accordance with Section 3.4.4 and
Appendix D of the EIA Study Brief as well as the criteria and guidelines
outlined in Annex 7 and Annex 15 of the TM-EIAO.
3.5.2
Construction Phase
3.5.2.1
Potential waste management implications
from the generation of waste during the construction phase have been evaluated.
Strategic mitigation measures, including the opportunity for on-site sorting,
reusing C&D materials, etc, are devised to minimize the surplus materials
to be disposed. Recommendations have been made for implementation by the
Contractor during the construction period to minimize waste generation and
off-site disposal. The estimated amount of different types of wastes to be
generated during construction phase and the respective proposed management
options are summarised in following table.
Table 3.1 Estimated amount of different types of wastes to be generated during construction phase
Waste types |
Total generated (m3) |
Total
On-site reuse (m3) |
Total off-site reuse and disposal (m3) |
Stage(s) of the materials arising |
Management options |
Inert
C&D materials |
|||||
Inert soft C&D materials [1] |
15,330 |
3,785 |
11,545 |
Excavation |
Tuen Mun Area 38 Fill Bank (Proposed) |
Rock [2] |
5,120 |
0 |
5,120 |
Excavation |
Tuen Mun Area 38 Fill Bank (Proposed) |
Artificial hard materials [3] |
3,040 |
0 |
3,040 |
Construction and Demolition |
Tuen Mun Area 38 Fill Bank (Proposed) |
Non-inert
C&D materials [4] |
|||||
Non-inert C&D materials |
5,870 |
0 |
5,870 |
Excavation/ Construction and Demolition |
WENT Landfill
(Proposed) |
Others |
|||||
Excavated Sediment |
<100 |
0 |
<100 |
Excavation |
Type 1 – Open Sea Disposal |
Chemical waste |
100 L/ month |
0 |
100 L/ month |
Excavation/ Construction and Demolition |
Chemical Waste Treatment Centre |
General refuse |
130 kg/day |
0 |
130 kg/day |
Throughout the whole construction programme |
Collected and disposed by licensed collector
to Recyclers/ Landfill |
General sewage |
30 m3/day |
0 |
30 m3/day |
Throughout the whole construction programme |
Sanitary facilities to be provided on-site and maintained by licensed
collector |
Note:
[1] “Inert soft C&D materials” include, but
not limited to, top soil, excavated soil etc.
[2] “Rock” includes all grade rock.
[3] “Artificial hard material” includes, but not
limited to, broken concrete, asphalt, bitumen and granular materials etc.
[4] “Non-inert C&D materials” includes, but
not limited to, bamboo, timber, paper and plastic etc.
3.5.2.2
The wastes (e.g. non-inert C&D materials,
vegetation, general refuse) generated from the Project will be
transferred to designated landfill site for disposal. And surplus inert C&D
materials will be transferred to the designated public fill reception
facilities. For other wastes including sediment, chemical wastes, general
refuse and sewage would be delivered to respective receiving facilities by
future contractors. Less than 100m3
excavated sediment to be arisen from the Project is estimated to be of Cat. L
and is proposed for Type 1 - Open Sea Disposal.
3.5.2.3
For chemical waste, the amount of wastes
that will arise will be highly dependent on the contractor’s on-site
maintenance practice and the number of plant and vehicles utilized.
Nevertheless, it is anticipated that the quantity of chemical wastes would be
small. With the implementation of the mitigation measures recommended in the
EIA report, no adverse impact is anticipated.
3.5.2.4
For general refuse and sewage, no adverse
impact is anticipated with the implementation of mitigation measures, such as
good waste management practices, provision of portable toilet, etc,
recommended.
3.5.3
Operational Phase
3.5.3.1
It is anticipated that the operation of
the proposed pedestrian corridor would only generate small quantity of wastes
from users, of which mainly are general refuses. The waste generated should be
managed to prevent waste materials from being blown around by wind, flushed or
leached into the nullah, or creating an odour nuisance or pest and vermin
problem. With the implementation of the waste management measures, such as
provision of refuse collection bins and recycling bins, no adverse impact is
anticipated.
3.6.1.1
The potential land contamination issue
associated with the project have been assessed by following the guidelines in
Section 3.1 and 3.2 of Annex 19 of the TM-EIAO as specified in Section 3.4.4
and Appendix D of the EIA Study Brief.
3.6.1.2 Upon review of historical aerial photo and site reconnaissance, it was observed that the Project Area has been a channelized watercourse lined with concrete and concrete-paved pedestrian footpath for more than 20 years. Also, no historical or existing contaminating activities are identified within the nullah area and the associated concrete-paved footpaths. No soil contamination is anticipated in the Project Area.
3.7.1.1
The potential ecological impacts have been
assessed by following the guidelines in Annex 8 and Annex 16 of the TM-EIAO as
well as Section 3.4.5 and Appendix E of the EIA Study Brief.
3.7.1.2
The proposed elevated pedestrian corridor
will be situated in a highly urbanized town area. There is no site of
conservation importance within the Project Area or the 500m assessment area.
The Yuen Long Nullah beneath the proposed elevated pedestrian corridor is a
modified open water channel with concrete paved throughout the nullah.
3.7.1.3
The Project Area is a highly urbanized and
limited information on the ecological condition is available. Site visits were
conducted in January, March and September 2015 to identify any ecological
resources within the Project Area and 500m Assessment Area. No habitat or
species of conservation importance is identified within the Project Area. Due
to the highly developed and disturbed status, the ecological value of the
Project Area and within 500m assessment area is considered low.
3.7.1.4
The major construction works would take
place in the Yuen Long Town Nullah. The nullah is connected to Shan Pui River,
which is hydrological linked to the ecological sensitive area further downstream,
including various habitats in the Wetland Buffer Area and Wetland Conservation
Area. Mitigation measures are proposed and must be strictly followed to prevent
deterioration of water quality of the nullah to avoid adverse impact to the
ecological sensitive areas downstream. With proper implementation of the
mitigation measures, the generation of pollutants and their release to the
nullah would be minimised and no significant adverse residual impact is
anticipated.
3.8.1
Introduction
3.8.1.1
A landscape and visual impact assessment
has been carried out in accordance with Section 3.4.6 and Appendix F of the EIA
study brief, and Annexes 10 and 18 of the TM-EIAO.
3.8.1.2
The major sources of impacts on existing
landscape and visual sensitive receivers during both construction phase and
operational phase were identified. For construction phase, the major sources of
impact include the construction of the footbridge, piers of footbridge,
pedestrian interchange and landscape area as well as construction traffic,
laying down of utilities, temporary site access areas, site cabins and heavy
machinery, and dust during dry weather. For operational phase, the major
sources of impact include the footbridge, pedestrian interchange, piers of
footbridge and extensive landscaped spaces.
3.8.1.3
Within the landscape and visual impact
assessment study area, a total of 17 major landscape resources (LR), 7 major
landscape character areas (LCAs) and 31 representative Visual Sensitive
Receivers (VSRs) were identified and may be affected by the development. In
addition, a tree survey was carried out determine the potential impacts on
existing trees.
3.8.2
Tree Survey
3.8.2.1
A tree survey was conducted in May 2015 to
assess all existing trees within the Project works limit. A total of 125 trees
belonging to 26 species were recorded. Among these 125 trees, there is no
Registered Old and Valuable Tree (OVT), “Important Tree” and stonewall tree.
Five trees, Ailanthus fordii, which
are rare and precious tree species included in “Rare and Precious Plants of
Hong Kong” or “Forest and Countryside Ordinance” (Cap 96) were identified, but
they are located far away from the project site and will not be affected by the
Project.
3.8.2.2
Based on the assessment results, there are
approximately 38 trees
will be affected due to the construction of the proposed works, in which 1 of
them will be transplanted and 37 trees will be felled. None of these affected
trees are LCSD Champion Trees and Registered Old and Valuable Trees. All of
them are common species. All those trees with high amenity value but
unavoidably affected by the works will be transplanted where possible. Detailed
tree preservation, transplanting and felling including compensatory planting
proposal shall be separately submitted to relevant government departments for
approval. Based on the proposed works, trees will be planted along roadside
amenity areas and new open spaces to compensate for the loss of existing
trees.
3.8.3
Construction Phase
3.8.3.1
Based on the impact assessment findings,
mitigation measures covering all relevant landscape and visual aspects are
proposed to be implemented during construction. These include protection of
retained trees, transplanting of trees those are unavoidably affected,
compensatory trees planting, control of night-time lighting and erection of
decorative screen hoarding compatible with the surrounding setting.
3.8.3.2
After implementing the recommended
mitigation measures, all LRs and LCAs either anticipated to experience residual
impacts of moderate to slight significance or insubstantial impacts by the
proposed development. For VSRs, leisure and recreational users along the footbridges crossing Yuen Long Nullah and some residential VSRs which located close to
the interchange structure are still anticipated to have substantial visual
impacts, besides that, all other VSRs are either anticipated to experience
residual impacts of moderate to slight significance impacts.
3.8.4
Operational Phase
3.8.4.1
Based on the impact assessment findings,
mitigation measures covering all relevant landscape and visual aspects are
proposed to be implemented during the operational phase. These include
compensatory trees planting, aesthetic design of the footbridge, use of
visually unobtrusive and non-reflective building materials, avoidance of
excessive height and bulk of buildings structure, proper design of the
streetscape elements in a manner that responds to the local context and
minimize potential landscape and visual impacts, suitable directional of
lighting units to minimize unnecessary light spill, maximization of soft
landscape and roadside tree planting.
3.8.4.2
After implementing the recommended
mitigation measures, most LRs, LCAs and VSRs are either anticipated to
experience residual impacts of slight significance, or insubstantial impacts by
the proposed development, except the view point from leisure and recreational users the travellers along the footbridges crossing of Yuen Long Nullah which still have substantial visual
impact due to the blockage of the view corridor by the footbridge. Besides
that, some residential VSRs which located close to the interchange area will
still have moderate visual impact. However, considering the fact that visual obstructions to particular VSRs are unavoidable even with alternative alignments to the footbridge and the site constraints that limit the further adoption of visual mitigation measures, it is considered that the proposed development has fully explored alternative methods to avoid, reduce and alleviate the identified visual impact. The proposed footbridge is therefore considered as
marginally acceptable in visual point of view.
3.8.5
Conclusion
3.8.5.1
In accordance with the criteria and
guidelines for evaluating and assessing impacts as stated in Annex 10 and 18 of
the TM-EIAO, it is considered that the overall landscape
impact of the project are considered to be acceptable with mitigation measures
and visual impact of the project is considered to be marginally acceptable with
mitigation measures.
3.9.1
Introduction
3.9.1.1
As required under Section 3.4.7 of the EIA
study brief, a cultural heritage impact assessment has been conducted. This
includes a built heritage assessment and an archaeological impact assessment,
to evaluate the impacts on known or potential cultural heritage resources in
the 100m assessment
area. The cultural heritage impact assessment follows
the requirements of Annex 10 and 19 of the TM-EIAO as well as Appendix G and
Appendix G-1 of the EIA study brief.
3.9.2
Built Heritage
3.9.2.1
A literature review conducted for the
built heritage impact assessment has collated relevant information on Declared
Monuments and Graded Historic Buildings. A field survey was also conducted for
built heritage to identify other built heritage resources. Results indicates
that there is no Declared Monuments within 100m assessment area. Besides, there
are one proposed Grade 3 Historic Building (i.e. Entrance Tower of Tai Kiu
Tsuen) and one Nil Graded Historic Building (i.e. No. 21 Tai Kiu Tsuen) located
about 110m and 90m away from the work area.
However, no adverse direct and indirect impact from the Project is anticipated
due to the large separation distance of these heritage resources and the work
area.
3.9.3
Archaeology
3.9.3.1
A literature review for archaeological
impact assessment was conducted. No site of archaeological interest, government
historical site and area of significant archaeological potential were
identified within the 100m assessment area. As the area of the Project will be
confined within the Yuen Long Town Nullah and footpath along the nullah, no
potential impact is anticipated and no archaeological survey is considered
necessary for the Project.
3.10
Environmental Monitoring and Audit
3.10.1.1
The Environmental Monitoring and Audit
(EM&A) requirements and the mitigation measures to be implemented during
construction and operation phases of the project have been specified in the
EM&A Manual. The EM&A Manual contains full details of the proposed
baseline and impact monitoring programmes, as well as performance
specifications, audit requirements and monitoring procedures. The EM&A
programme will be implemented throughout the entire construction period and
operation period to regularly monitor the environmental impacts on the
neighbouring sensitive receivers.
3.10.1.2
4.1.1.1
The findings of the EIA provided
information on the nature and extent of the environmental impacts likely to
arise from the construction and operation of the elevated pedestrian corridor
in Yuen Long Town connecting with Long Ping Station. The EIA has, where
appropriate, identified mitigation measures to ensure compliance with environmental
legislation and standards.
4.1.1.2
Overall, the EIA concluded that the
Project would comply with the requirements of the EIAO and TM-EIAO with the
implementation of the recommended mitigation measures during the construction
and operation phases. The schedule of implementation of the recommended
mitigation measures has been provided in the EIA report. An EM&A programme
has also been recommended to check the effectiveness of the recommended
mitigation measures.