TABLE OF
CONTENTS
Page
1. introduction. 1
2. Potential Environmental Benefits and Application Considerations. 2
3. ExtenT and location of New low noise road surfacing material(s),
mINIMISATION OF nOISE bARRIERS AND traffic nOISE rEDUCTION. 3
3.1 Road
D4, Road L4 and Road L5 (Ying Tung Road) 3
4. Summary and Way Forward. 5
FIGURES
Figure 3.1 Locations and extents of
the proposed LNRS at Road L4, Road L5
(Ying Tung Road) and Road D4
Figure 3.2 Locations and extents of
the proposed LNRS at Ying Tung Road (Road L5)
DRAWINGS
60507694/Z35/Figure 1 Location
Plan of
Tung Chung New Town Extension (extracted from EP (EP No. EP-519/2016)
60507694/Z35/Figure 1.1 Layout
Plan of Tung Chung New Town Extension (East)
60507694/Z35/003 General
Layout of Nosie Barriers and Low Noise Road Surfacing Materials in Tung Chung
East
APPENDICES
Appendix A Implementation
Schedule for Noise Mitigation Measures in TCE
1.1.1
Tung Chung New Town Extension
(TCNTE) (This Project) covers Tung Chung (East)(TCE) and Tung Chung
(West)(TCW), forms part of the Tung Chung New Town Extension (TCNTE). This
Project includes reclamation, site formation and engineering infrastructure
works (including construction of Road P1) for the developments of TCE,
construction of salt water pumping station and infrastructure works in Tung
Chung Area 58. The EIA Report for TCNTE (AEIAR-196/2016) was approved in April
2016. 60507694/Z35/Figure 1 and 60507694/Z35/Figure
1.1 show the layout plans of TCNTE and TCE
respectively.
1.1.2
This submission is to
review the use of new low noise road surfacing (LNRS) materials in TCE under
Condition 2.23 of Environmental Permit (EP)(EP No. EP-519/2016). For the
submission for TCW, please refer to the project website of TCW
(https://www.env.tcnte-west.hk/en/ep-submissions.html).
This submission will be revised if there is any update of the information.
1.1.3
Subsequent to the approval of the
TCNTE EIA, Executive Council endorsed to enhance the development intensity of
public housing sites to address land supply shortage, under such circumstance,
traffic noise impact assessment was conducted to review traffic noise impact as
a result of the intensification policy on public housing sites in TCNTE. The
assessment result is presented in the reports “Traffic Noise and Railway Noise
Impact Assessments Review for Population Increase and Development Intensity –
CASE 2 Scenario 2B (Ref. PI27-02)”. This report recommended application of Low
Noise Road Surfacing (LNRS) in some road sections on Roads D4, L4 and L5 (Ying Tung
Road).
1.1.4
This submission is to review use
of new LNRS materials in TCE within the TCNTE EIA and EP boundaries, and shall
cover the noise mitigation measures at Road L4, L5, D4 and Ying Tung Road only.
The review for the use of new LNRS material elsewhere in TCE (including Road
D3, Road L7 and Road P1) would be covered in separate submission in view of the roadworks programme. Road
sections of part of Ying Tung Road (lying between Ying Hei Road and Road P1),
Ying Hei Road and Tung Chung Waterfront Road not within TCNTE EIA and EP
boundaries are not covered in the review of this submission.
1.2
Scope of this Plan
1.2.1
In accordance with Condition 2.23
of the Environmental Permit (EP)(EP No. EP-519/2016), this plan shall include at
least the following information:
ii) the extent and locations of providing the new road surfacing
material(s) for the roadworks covered by the EP with justifications; and
iii) reduction in traffic noise impacts at specific sensitive receivers
and minimization of the extent of noise barriers for the roadworks covered by
the EP as a resulting of applying the new road surfacing material(s).
2.1.1
According to Guidance Notes on Low
Noise Road Surfacing on Local Roads (RD/GN/011D) issued by the Research &
Development Division of HyD, Polymer Modified Friction Course (PMFC), attributed
to its porous nature, is susceptible to wear and tear making is not
sufficiently durable as low noise road surfacing for many situations to sustain
the local road conditions.
2.1.2
A new type of LNRS materials,
namely the polymer modified stone mastic asphalt of 6mm nominal maximum
aggregate size (PMSMA6) which was tested in the study (Agreement No.
Hy(S)Q/024/2016). It was found that PMSMA6 is a better mix than PMFC in various
aspects, in particular for resisting rutting. Such findings tally with the
understanding that the engineering performance of PMSMA6 (which is structural
layer) is superior to PMFC (which is non-structural layer). Therefore, PMSMA6
can be laid on base course directly while PMFC has to be laid on top of wearing
course in general in their application on bituminous road surface.
2.1.3
In addition, for the environmental
benefits, the optimised texture of PMSMA6, which is smooth enough in minimising
tyre vibration and with small open texture to reduce air pumping, gives the
surface certain noise reduction potential. Such noise reduction mechanism
could be more sustainable than PMFC. PMSMA6 is considered a better LNRS
materials alternative for local roads conditions, as compared with PMFC. It is
recommended the use of the PMSMA6 as LNRS materials for this project.
2.1.4
The PMSMA6 is found suitable to be
laid on bituminous local roads as LNRS except that the following locations/road
characteristics shall be excluded:
·
Road sections where
more durable materials (e.g. polymer modified stone mastic asphalt with 10mm
nominal maximum aggregate size (PMSMA10) or highly modified stone mastic
asphalt with 10mm nominal maximum aggregate size (HMSMA10) should be used
according to Table 2 of the latest version of Guidance Notes No. RD/GN/038
·
Run in-out located at
industrial buildings or heavy vehicle car parks
·
Bus stop zone on road
section with gradient greater than 5%
·
stop line zone of bus
lane
·
sharp turn located at
entrance/ exit of bus terminus
3.1
Road D4, Road L4 and Road L5
(Ying Tung Road)
3.1.1
Traffic Noise and Railway Noise
Impact Assessments Review for Population Increase and Development Intensity - CASE
2 Scenario 2B (Ref. PI27-02). proposed Low Noise Road Surfacing (LNRS), which
will be PMSMA6, along Road D4, Road L4 and Road L5 (Ying Tung Road) as part of
the noise mitigation measures in TCE. The locations of LNRS along Road D4, Road
L4 and Road L5 (Ying Tung Road) are shown in Figure 3.1, which is
extracted from Case 2 Scenario 2B (Ref. PI27-02) - report Appendix 2.4. The extents
of LNRS at Road D4, Road L4 and Road L5 (Ying Tung Road) are summarized in
Table 3.2. Due to the site limitation, the extent of LNRS will fall into the
acceleration zone and braking zone. Notwithstanding, the proposed scheme has
been agreed with HyD/NT Region for the extent and use of PMSMA6 under housing
intensification to meet the noise level standards and achieve minimal extent of
LNRS.
Remarks: For the LNRS at Road L4 between Area 99 and Area 100, the LNRS at Road L4 (Northbound) is about 175m, while
the LNRS at Road L4 (Southbound) is about 160m.
WB = Westbound, EB = Eastbound, NB =
Northbound, SB = Southbound
Figure 3.1
– Locations and extents of the proposed LNRS at Road L4, Road L5 (Ying Tung
Road) and Road D4
|
Location
|
LNRS
|
|
Road D4 (Westbound) between Area 100 and Area 109
|
~35m from cut-line of road junctions
|
|
Road L4 (Northbound) between Area 103 and Area 109
|
~80m from cut-line of road junctions
|
|
Road L4 (Northbound) between Area 99 and Area 100
|
~175m from cut-line of road junctions
|
|
Road L4 (Southbound) between Area 99 and Area 100
|
~160m from cut-line of road junctions
|
|
Road L5 along Ying Tung Road
|
~120m from cut-line of road junctions
|
Table 3.2 – Extent of LNRS at Road
D4, Road L4 and Road L5 along Ying Tung Road
Figure 3.2
– Locations and extents of the proposed LNRS at Ying Tung Road (Road L5)
3.1.2
Under the unmitigated scenario,
the maximum predicted noise level at Area 99, 100, 103
and 109 at Year 2045 is 73-74dB(A). For the existing NSRs A56-001 and
A56-002 of Ying Tung Estate, the maximum unmitigated noise
level is 72dB(A) and 71dB(A), respectively. With the
implementation of LNRS shown in Figure 3.1, 3.2 together with
additional at-receiver mitigation measures (e.g. acoustic windows, architectural
fins, etc.) at the planned sites recommended in “Traffic Noise and Railway
Noise Impact Assessments Review for Population Increase and Development
Intensity- CASE 2 Scenario 2B (Ref. PI27-02)”, the maximum predicted noise
level at Area 99, 100, 103 and 109, as well as the existing NSR A56-001 and
A56-002 of Ying Tung Estate will all comply with the 70dB(A) noise criteria, adverse
noise impact would not be expected. No noise barriers were proposed along Road
D4, Road L4 and Road L5 (Ying Tung Road) in CASE 2 Scenario 2B (Ref. PI27-02).
4. Summary and Way Forward
