3.1 Description of the Site Area
3.1.1.1
The existing environment in the study area comprises a
combination of urban residential, institutional, commercial and industrial
areas in Chai Wan in the Eastern District.
According to the latest Chai Wan Outline Zoning Plan (OZP) No.: S/H20/20,
one third of the Project site is zoned as “Government, Institution and
Community (G/IC(2))” and two third of the site as “Open Space”. Nevertheless, the Lands Department
(LandsD) allocated the Project site to EMSD in 2009 for a temporary period of 5
years under Temporary Land Allocation No. THK-1856.
3.1.1.2
As shown in Figure
1.1, the Project site is located near the promenade of Chai Wan Public
Cargo Working Area, and is bounded by Sheung On Street,
·
To the south: Tsui
Wan Estate, Hang Tsui Estate, Tsui Lok Estate, Yue Wan Estate, etc;
·
To the east: Chai
Wan Public Cargo Working Area,
·
To the north: Citybus
Chai Wan Bus Depot, New World First Bus Chong Fu Road Permanent Depot, Hong
Kong Institute of Vocational Institute (Chai Wan), etc; and
·
To the west:
3.1.1.3
The historical land use activities in chronological order are
summarized as follows:
·
Before 1984: Marine
environment;
·
1984 to 1985: Reclamation;
·
1987 to 1996: Wing
Tai Temporary Housing Area;
·
1996 to 2003: Vacant;
·
2003 to 2004: Temporary
general storage area of Drainage Services Department (DSD);
·
2005 to 2008: Temporary
general storage area of DSD and Food and Environmental Hygiene Department
(FEHD); and
·
2008 to now: Vacant.
3.2.1.1
Based on the preferred option of this workshop,
the proposed vehicle workshop will be
constructed in the form of a low-rise canopy structure with minimum clear headroom of
5.2m covering approximately 1,200m2 of the site. The canopy will provide covered space for
carrying out general vehicle repair and maintenance activities for
small and light vehicles (i.e. motorcycle, saloon cars and
light vans) in the
government fleet. Major vehicle
body repair, and traffic accident repair and vehicle body painting (including
paint spraying) will not be carried out in this workshop.
3.2.1.2
The ground floor and roof layout
plans of the preliminary design of the proposed Hong Kong Vehicle Workshop are depicted in Figures 3.1-3.4.
The preliminary schedule of
facilities at the proposed workshop is as follows:
·
17 no. of vehicle hoists for vehicle and motorcycle repair
or maintenance;
·
3 no. of store rooms;
·
1 no. of dangerous goods (DGs) store;
·
1 no. of roller brake tester;
·
1 no. of motorcycle brake tester;
·
1 no. of motorcycle speedometer;
·
1 no. of tyre changer;
·
1 no. of wheel balancer;
·
A 2-storey office and store;
·
An F.S. pump room;
·
A main switch room;
·
A compressor room with 2 compressors and 2 air dryers;
·
A security room; and
·
Toilets.
3.2.1.3
There will be 3 storerooms and a DG store for the storage of
vehicle parts and engine lubrication oil, respectively. Air compressors for providing power for
driving pneumatic tools for facilitating vehicle maintenance activities will be
housed in the compressor room to isolate all the noise generated. Around 17 vehicle hoists will be
provided in the workshop for the lifting of vehicles to facilitate vehicle
under-chassis inspection and maintenance.
The workshop will also be equipped with a roller brake tester, tyre
balancers and tyre changers for the repair and maintenance needs. The workshop will not provide vehicle
cleansing services for other vehicles, but a cleansing bay is provided just in
case the cleaning of in-house vehicles is required occasionally.
3.2.1.4
All vehicles delivered for servicing will be temporarily parked
in the vehicle reception area for general inspection and handover from the clients. The vehicles will be driven to the respective
vehicle maintenance bays for servicing, after which they will be parked again at
the vehicle reception area, awaiting the clients’ collection. The duration of normal servicing is
expected to be about 3 to 5 working days, during which the movement of vehicles
within the workshop will be limited. The total estimated daily numbers of vehicles
detained in the workshop has been determined to be approximately 58, with the
breakdown as shown below:
·
Motorcycles: 12;
·
Saloon cars: 18;
·
VIP and large saloon cars: 9;
·
Ambulance: 4; and
·
Medium sized vans: 15.
3.2.1.5
The daily turnover rate of the above vehicles will be 15 and
there will be approximately 10 vehicles attending the workshop for a quick
repair service (which will be completed within the same day). As such, the average daily in/out
traffic volumes would equal 50 ((15 + 10) x 2) numbers of vehicles. The concurrent number of vehicles for
repairing and maintenance in the workshop is expected to be approximately 3, 5%
of the 58 vehicles, and the continuous engine on-time would be approximately 15
minutes per vehicle on the three occasions, that is, 5 minutes per vehicle per
occasion.
3.2.1.6
The number of staff working in the workshop and office is
estimated to be about 40 during daytime (0800 to 1800). In the evening time (1800 to 2100), less
than 10 staff will be standby in the workshop for attending any vehicle
breakdown and towing requests and based on the existing EMSD Hong Kong Vehicle Workshop
at 98 Caroline Hill Road in Causeway Bay, the frequency of evening time night vehicle
breakdown and towing request would only be very infrequent and therefore
considered as emergency.
3.3 Construction Methodology
3.3.1.1
Based on the preferred option of this workshop, at the
commencement of construction, site formation works will be carried out and
these will comprise the fencing off the site boundary, cutting and removal of
unwanted rocks, shrubs, trees and building debris, leveling of soil surface,
excavation of soil to the required level with shoring as necessary. These tasks will involve the use of
hand-held breakers and tracked excavators.
3.3.1.2
Construction of the concrete footing will be accomplished by
excavating to required level and removal of debris to set out the required
depth and leveling of soil.
Formwork will be erected at both sides with the laying of blinding layers
and reinforcement bar, following by concreting. The formwork will be removed at the
end. These tasks will involve the
use of concrete lorry mixers, a concrete pump, bar bender and sawing.
3.3.1.3
The underground drainage and plumbing works will involve the
compacting of soil and laying of blinding layer, then bracketing and fixing of the
drainage and plumbing and connection, followed by the water testing. These tasks will involve the use of tracked
excavators fitted with hydraulic rock breaker, concrete lorry mixers and
sawing.
3.3.1.4
The erection of the steel frame will be conducted on the concrete
structure slab and involve the use of tracked
mobile cranes, dump trucks and welding machines. This will be followed by the
installation of the sandwich roof on the frame by screw-fixing / GMS hook bolts
and pointing screw by waterproofing sealant using drill rigs and tracked mobile
cranes.
3.3.1.5
Construction of plant rooms will include
general construction works, e.g. concreting, and involve the use of concrete lorry
mixers, concrete pumps, bar benders and sawing.
3.3.1.6
Construction of concrete floor slab will involve vertical
timbering of soil, compaction of ground, laying of damp proof membranes, fixing
of reinforcement bars, concreting, removal of formwork and pointing joint
sealant, and installation of floor tiles.
These tasks will involve the use of tracked excavators fitted with
hydraulic rock breakers, concrete lorry mixers, bar benders and sawing.
3.3.1.7
The final stage of construction works will be the building
services works which will include the construction of cable trench,
installation of conduits, wiring, fixing of installations, and testing and
commissioning. These tasks will involve
the use of drill rigs.
3.4 Project Implementation Programme
3.4.1.1
Appendix 3.1 shows the construction programme
of this project, based on which this EIA was carried out. The design of the workshop is on-going
during the preparation of this EIA report.
The construction works are planned to be commenced in around August 2012
and completed in November 2013, upon which mobilisation and installation of the
equipment will be carried out. The anticipated
operation will be commenced tentatively in February 2014 and completed in July
2017.
·
2012 August: Commencement
of construction works.
·
2013 November: Completion
of construction works and mobilisation and installation of equipment.
·
2014 February: Commencement
of operation of the Project.
·
2017 July: Tentative
completion of operation of the Project.
3.5 Concurrent Projects
3.5.1.1
There are several concurrent projects in the vicinity of the
Project site, as also depicted in Figure
1.1 and summarised in Table 3.1. At this stage, consideration of
concurrent projects for cumulative environmental impacts will only take into
account those with the available implementation programmes. Potential cumulative impacts from the
planned and existing major concurrent projects, if any, have been assessed in
the individual sections of this EIA study.
Table 3.1 List of Potential Concurrent Projects
|
Concurrent
Projects |
Potential Cumulative
Impacts |
|
|
Construction Phase |
Operation Phase |
|
|
Planned |
ü |
ü |
|
Existing |
X |
ü |
|
Existing Headquarters
and Bus Maintenance Depot in Chai Wan (EP-107/2001) |
X |
ü |
|
Existing open roads, e.g. Sheung On Street, Sheung Ping Street, Wing
Tai Road, Shing Tai Road, Island Eastern Corridor |
X |
ü |
3.5.1.2
It should be noted that the Planned Post-Secondary College
in Table 3.1 falls within an area
partly zoned “Open Space” (“O) and partly “Government, Institution or
Community(2)” (“G/IC(2)”) on the draft Outline Zoning Plan No. S/H20/20 (the
OZP). According to the Notes of the
OZP, temporary uses (expected to be 5 years or less) of any land or building
are always permitted as long as they comply with any other relevant
legislations and Government requirements.
However, development at the site zone “G/IC(2)” is subject to a building
height (BH) restriction of 70mPD, or the height of the existing building,
whichever is the greater.
3.6 Identification of Key Environmental Issues
3.6.1.1
The identified key environmental issues during the
construction and operation phases include the following:
During Construction Phase
·
Potential noise impacts arising from the construction works activities;
·
Potential dust impacts arising from the construction works activities;
·
Potential water quality and sewerage impacts arising from the
construction works activities and workforce;
·
Potential waste management implications arising from the construction works
activities; and
·
Potential landscape and visual impacts arising from the construction works
activities;
·
Potential cumulative environmental impacts through interaction or in
combination with other existing, committed and planned concurrent projects.
During Operation Phase
·
Potential fixed noise impacts arising from the vehicle repairing and
maintenance activities in the workshop;
·
Potential vehicular emission impacts arising from the vehicle repairing
and maintenance activities in the workshop and road carriage ways in the
vicinity of the workshop;
·
Potential sewerage impacts arising from the workforce in the workshop;
·
Potential waste management implications and land contamination arising
from the vehicle repairing and maintenance activities;
·
Potential landscape and visual impacts arising from the operation of the
workshop; and
·
Potential cumulative environmental impacts of the Project and associated
works, through interaction or in combination with other existing, committed and
planned projects in their vicinity, and that those impacts may have a bearing
on the environmental acceptability of the Project.
3.6.1.2
Table 3.2 below summarises the
scope of the environmental issues with respect to the works items that are
assessed in this EIA study.
Table 3.2 Summary
of Works Items and Environmental Issues
|
Project
Phase |
Works
Items |
Potential Environmental
Issues |
||||
|
Noise |
Air Quality |
Water & Sewerage |
Waste & Land Contamination |
Landscape
& Visual |
||
|
Construction |
Site formation works, construction of concrete footing,
plumbing and drainage system, erection of steel frame, installation of sandwich
roof panel, construction of plant rooms, construction of concrete floor slab,
building services works, etc. |
ü |
ü |
ü |
ü |
ü |
|
Operation |
General vehicle repairing and maintenance
activities involving the use of pneumatic tools, hoists, roller brake tester,
tyre balancers and tyre changers, cleansing, etc. |
ü |
ü |
ü |
ü |
ü |