4 NOISE IMPACT ASSESSMENT

4.1 Introduction

A noise assessment has been undertaken to define the nature and scale of potential environmental impacts associated with the implementation of the Tung Chung Cable Car Project specifically in terms of the effects in the vicinity of sensitive receivers. Both construction and operational phase impacts have been assessed and mitigation measures have been identified to determine whether residual impacts can be reduced to acceptable levels.

4.2 Legislation, Standards, Guidelines and Criteria

Construction Noise

The principal legislation for the control of construction noise is the Noise Control Ordinance (NCO) (Cap 400) ~~and the Environmental Impact Assessment Ordinance (EIAO)(Cap 499)~~. Various Technical Memoranda (TMs), which stipulate control approaches and criteria, have been issued under the NCO and EIAO. For this project, the following TMs are ~~applicable to the control of noise from construction activities~~ relevant to the assessment of the construction noise impacts:-

· ~~Technical Memorandum on Noise from Percussive Piling (PP-TM);~~

· Technical Memorandum on Noise from Construction Work other than Percussive Piling (GW-TM);

· Technical Memorandum on Noise from Percussive Piling (PP-TM); and

· Technical Memorandum on Environmental Impact Assessment Process (TMEIA).

Percussive Piling

Percussive piling is prohibited at any time on Sundays and public holidays and during the weekday evening and nighttime hours (1900-0700 hours, Monday through Saturday). A Construction Noise Permit (CNP) is required for such works during the daytime hours (0700-1900 hours) Monday through Saturday.

When assessing a CNP application for carrying out of percussive piling, the Environmental Protection Department (EPD) is guided by the PP-TM. The EPD will look at the difference between the Acceptable Noise Levels (ANLs), as promulgated in the PP-TM, and the Corrected Noise Levels (CNLs) that are associated with the proposed piling activities. Depending on the level of noise impact on nearby NSRs, the EPD would allow 3, 5 or 12 hours of piling time daily (see Table 4.1 below).

Table 4.1 Permitted Hours of Operation for Percussive Piling

Amount by which CNL exceeds ANL	Permitted hours of operation on any day not being a holiday
more than 10 dB(A)	0800 to 0900 and 1230 to 1330 and 1700 to 1800
between 0 dB(A) and 10 dB(A)	0800 to 0930 and 1200 to 1400 and 1630 to 1800
no exceedance	0700 to 1900

Amount by which CNL exceeds ANL

Permitted hours of operation on any day not being a holiday

more than 10 dB(A)

0800 to 0900 and 1230 to 1330 and 1700 to 1800

between 0 dB(A) and 10 dB(A)

0800 to 0930 and 1200 to 1400 and 1630 to 1800

no exceedance

0700 to 1900

General Construction Works

Noise impacts arise from general construction works during normal working hours (i.e. 0700 to 1900 hours on any day not being a Sunday or public holiday) at the openable windows of noise sensitive buildings are to be assessed as per the guidelines contained in the TMEIA. The recommended noise standards are 75dB(A) for domestic premises, 70dB(A) for educational institutions, 65dB(A) during examinations.

The NCO provides statutory controls on general construction works during the restricted hours (i.e. 1900-0700 hours Monday to Saturday and at any time on Sundays and public holidays). The use of powered mechanical equipment (PME) for carrying out construction works during the restricted hours would require a CNP. The EPD is guided by the GW-TM when assessing such an application.

When assessing an application for the use of PME, the EPD will compare the ANLs, as promulgated in the GW-TM, and the CNLs (after accounting for factors such as barrier effects and reflections) associated with the proposed PME operations. A CNP will be issued if the CNL is equal to or less than the ANL. The ANLs are related to the noise sensitivity of the area in question and different Area Sensitivity Ratings (ASR) have been drawn up to reflect the background characteristics of different areas. The relevant ANLs are shown in Table 4.2 below.

Table 4.2 Acceptable Noise Levels (ANL, L_{eq,
5 min} dB(A))

Time Period

Area Sensitivity Rating

All days during the evening (1900-2300 hours) and general holidays (including Sundays) during the day and evening (0700-2300 hours)

All days during the night-time (2300-0700 hours)

Regardless of any description or assessment made in this EIA Report on construction noise aspects, there is no guarantee that a CNP will be issued for construction of the project. The Noise Control Authority will consider a well-justified CNP application, once filed, for construction works within restricted hours as guided by the relevant Technical Memoranda issued under the Noise Control Ordinance. The Noise Control Authority will take into account contemporary conditions / situations of adjoining land uses and any previous complaints against construction activities at the site before making his decision in granting a CNP. Nothing in this EIA Report shall bind the Noise Control Authority in making his decision. If a CNP is to be issued, the Noise Control Authority shall include in it any condition he thinks fit. Failure to comply with any such conditions will lead to cancellation of the CNP and prosecution action under the NCO.

At this moment, only construction works during non-restricted hours are assumed and the feasibility of carrying out works during restricted hours has not been assessed.

Helicopter Operation

For planning purposes, the noise standards for the operation ~~control~~ of helicopter noise are provided in Table 1A of TMEIA which are reproduced~~tabulated~~ below in Table 4.3. However, if the helicopter is considered to be a ~~place~~ piece of construction equipment then the 75dB(A) at the sensitive receivers should be met.

Table 4.3 Noise Standard for Helicopter Operation

Uses	Helicopter Noise L_max dB(A) 0700 to 1900
All domestic premises including temporary housing accommodation	85
Hotels and hostels	85
Offices	90
Educational institutions including kindergartens, nurseries and all others where unaided voice communication is required	85
Places of public worship and courts of law	85
Hospitals, clinics, convalescences and homes for the aged · Diagnostic rooms · Wards	85

Notes :

(i) The above standards apply to uses which rely on open windows for ventilation;

(ii) The above standards shall be viewed as the maximum permissible noise levels assessed at 1m from the external facade.

Operational Noise

Noise standards are presented in the Noise Control Ordinance and its subsidiary Technical Memorandum for assessment against possible noise impact from industrial operation sources. Ngong Ping Area is generally rural in nature and with scattered village type developments. No influencing factors (i.e. major road and airport) are affected this area. On the other hand, as the Tung Chung area is being affected by Hong Kong International Airport (i.e. influencing factor) and is generally urban in nature. Hence,Iin the vicinity of the cable car alignment noise sensitive receivers at Ngong Ping and at Tung Chung are assumed as Area Sensitivity Rating “A” and “C” respectively. The Area Sensitivity Rating assumed in this EIA Report is for indicative assessment ~~only given that details of the plant layout are not yet available and building layout is only provisional~~. It should be noted that fixed noise sources are controlled under section 13 of the NCO. At the time of investigation, the Noise Control Authority shall determine noise impact from concerned fixed noise sources on the basis of prevailing legislation and practices being in force, and taking account of contemporary conditions / situations of adjoining land uses.

Nothing in this EIA Report shall bind the Noise Control Authority in the context of law enforcement against all the fixed noise sources being assessed.

For planning purposes, the noise standards for fixed noise sources are stipulated in Table 1A of TMEIA. The planning standards are 5dB(A) below the appropriate Acceptable Noise Levels (ANL) shown in Table 3 of the Technical Memorandum for the Assessment of Noise from places other than Domestic Premises, Public Places on Construction Sites or the prevailing background noise levels (for quiet areas with levels 5dB(A) below ANL). The ANL for the NSRs is presented in Table 4.4.

Table 4.4 Acceptable Noise Level at the Noise Sensitive Receivers

Time Period	Acceptable Noise Level
All days during the day (0700 to 1900 hours) and evening (1900 to 2300 hours)	60 dB(A)⁽ⁱ⁾	70 dB(A)⁽ⁱⁱ⁾
All days during the night-time (2300-0700)	50 dB(A)⁽ⁱ⁾	60 dB(A)⁽ⁱⁱ⁾

Notes:

(i) Area Sensitivity Rating is classified as “A” i.e. Ngong Ping

(ii) Area Sensitivity Rating is classified as “C” i.e. Tung Chung

~~As the gondolas will traverse the area between Ngong Ping and Tung Chung the most stringent criteria (for ASR “A”) will apply.~~

4.3 Baseline Conditions

The existing environment of the proposed Tung Chung Cable Car Project is primarily affected by the traffic on Tung Chung such as North Lantau ~~Highway~~Expressway, Tung Chung Waterfront Road, Tat Tung Road and Shun Tung Road. Immediately north of the works site for the proposed Tung Chung Terminal are the bus/car parks. No industrial uses are located within the Study Area. As such, the local traffic is considered to be the dominant source affecting the ambient background noise level.

The traffic on Ngong Ping such as Ngong Ping Road and other local roads is the dominant noise source at the Ngong Ping terminal.

According to the noise survey findings extracted from sub-clause 4.2.4 of Section 4 of approved EIA report under Register No. EIA-079/2002 “Ngong Ping Sewage Treatment Work and Sewerage”, the noise measurement results indicated that the lo

west background noise level during night-time is 45dB(A), which is 5dB(A) below the relevant ANL under the ASR of “A” for this area. Hence, 45(A) is to be adopted as noise criteria for Ngong Ping Area.

Based on the noise survey findings conducted at Tung Chung Town, the noise measurement results indicated that the noise levels (L_eq) ranged from 66.7 dB(A) to 71.7 dB(A) during daytime/evening while the noise levels (L_eq) ranged from 57.8 dB(A) to 64.2 dB(A) during night-time. Hence, "“ANL-5"” *(i.e. 55 dB(A)) under the ASR of "“C"” is more stringent than prevailing background noise level i.e. 57.8 dB(A) and is to be adopted asnoise ~~shown~~ criteria for Tung Chung Area.

4.4 Noise Sensitive Receivers

Representative Noise Sensitive Receivers (NSRs) within 300m of the project limit have been identified according to the criteria set out in the TM-EIA and NCO and through site inspections and a review of land use plans. NSRs and their horizontal distance to the nearest noise source have been identified and are summarized in Table 4.5. Locations of the NSRs are shown in Figures 4.1-to 4.3.

Table 4.5 Representative Noise Sensitive Receivers

NSRs	Area	Location	Usage	Distance to the nearest Noise Source
NSR1a		Village houses - Kam Wai Yuen	Residential	140
NSR1b	Ngong Ping	Village houses along Ngong Ping Road near bus terminus	Residential	370
NSR2	~~Ngong Ping~~	Tin Tan Buddha Status	Religious	440
NSR3		Lin Chi Monastery	Religious	270
NSR4		Tung Chung Crescent - Block 7 (Flat A)	Residential	50
NSR5	Tung Chung	Fu Tung Estate - Tung Ma House (Flat 03)	Residential	330
NSR6		Seaview Crescent - Block 1 (Flat D)	Residential	340
NSR7		Wan Ho Kan Primary School	Institutional	440
NSR8		Village houses at Tin Sum	Residential	345

4.5 Potential Construction Noise Impact

The main construction activities comprise construction of site formation, excavation foundations and superstructure. Construction activities for the Cable Car project are expected to be undertaken during normal daytime working hours (i.e. 0700 to 1900 hours on any day not being a Sunday or public holiday) although some works at the Tung Chung Terminal could take place over a longer period of time (eg 0700 - 2300 for steel fixing/form work etc.). According to the programme given in the EIA for the construction of Ngong Ping Sewage Treatment Work (STW) construction works are likely to overlap with Cable Car project to match the opening date. The cumulative noise impact of Cable Car project and relevant component sections of Ngong Ping STW (based on Table 4.8 of Section 4 of approved EIA report under Register No. EIA-079/2002 “Ngong Ping Sewage Treatment Work and Sewerage” ) have thus been assessed. Due to the project nature, threeA plant inventory lists consisting of Airport Island Angle Station, Ngong Ping/Tung Chung Terminals and Nei Lak Shan Angle Station/Towers for the Cable Car project, as confirmed by Mass Transit Railway Corporation (MTRC) ~~and Ngong Ping STW (based on Table 4.8 of Section 4 of approved EIA report under Register No. EIA-079/2002 “Ngong Ping Sewage Treatment Work and Sewerage” )~~ has been established. The details are contained in Tables 4.6 to 4.8.

Table 4.6Plant Inventory for Airport Island Angle Station/Towers T1 and T2 (No Mitigation Measures)

~~Plant Inventory for Airport Island Station/Towers T1 and T2~~

	PME	TM Ref.	No.	SWL/Unit, dB(A)	Sub-SWL, dB(A)
	*Site Formation and Excavation*
Site Foundation and Excavation	Breaker, excavator mounted (hydraulic)	CNP 028	2	122	125
	Excavator	CNP 081	1	112	112
	Dump Truck	CNP 067	2	117	120
				Total SWL	126
	*Substructure*
Piling	Piling, large diameter bored⁽¹⁾	CNP 164	1	115	115
	Excavator	CNP 081	1	112	112
	Bar bender and cutter (electric)	CNP 021	1	90	90
	Generator, standard	CNP 101	1	108	108
	Dump Truck	CNP 067	1	117	117
				Total SWL	120
Pile Cap	Bar bender and cutter (electric)	CNP 021	1	90	90
	Generator, standard	CNP 101	1	108	108
	Lorry	CNP 141	1	112	112
				Total SWL	113
Concreting	Crane, mobile	CNP 048	1	112	112
	Concrete lorry mixer	CNP 044	1	109	109
	Compactor, vibratory	CNP 050	1	105	105
				Total SWL	114
	*Superstructure*
Formwork and Reinforcement	Bar bender and cutter (electric)	CNP 021	1	90	90
	Generator, standard	CNP 101	1	108	108
	Crane, mobile	CNP 048	1	112	112
	Saw, circular, wood	CNP 201	1	108	108
	Lorry	CNP 141	1	112	112
				Total SWL	116
Concreting	Crane, mobile	CNP 048	1	112	112
	Concrete lorry mixer	CNP 044	1	109	109
	Compactor, vibratory	CNP 050	1	105	105
				Total SWL	114
Cabling	Conveyor belt	CNP 041	1	90	90
	Generator	CNP 102	1	100	100
	Hoist	CNP 122	1	95	95
	Winch	CNP 262	1	95	95
				Total SWL	102
Note(s):
1. Apart from CNP164, (CNP165-Piling, large diameter bored, oscillator) or (CNP166-Piling, large diameter bored, reverse circulation drill) may be used instead for the construction activities

Table 4.7 Plant Inventory for Ngong Ping/Tung Chung Terminals (No Mitigation Measures)~~Ngong Ping/Tung Chung Terminals~~

	PME	TM Ref.	No.	SWL/Unit, dB(A)	Sub-SWL, dB(A)
	*Site Formation and Excavation*
Site Foundation and Excavation	Breaker, excavator mounted (hydraulic)	CNP 028	1	122	122
	Excavator	CNP 081	1	112	112
	Dump Truck	CNP 067	1	117	117
				Total SWL	124
	*Substructure*
Piling	Piling, large diameter bored⁽¹⁾	CNP 164	1	115	115
	Excavator	CNP 081	1	112	112
	Bar bender and cutter (electric)	CNP 021	1	90	90
	Generator, standard	CNP 101	1	108	108
	Dump Truck	CNP 067	1	117	117
				Total SWL	120
Pile Cap	Bar bender and cutter (electric)	CNP 021	1	90	90
	Generator, standard	CNP 101	1	108	108
	Lorry	CNP 141	1	112	112
				Total SWL	113
Concreting	Crane, mobile	CNP 048	1	112	112
	Concrete lorry mixer	CNP 044	1	109	109
	Compactor, vibratory	CNP 050	1	105	105
				Total SWL	114
	*Superstructure*
Formwork and Reinforcement	Bar bender and cutter (electric)	CNP 021	1	90	90
	Generator, standard	CNP 101	1	108	108
	Crane, mobile	CNP 048	1	112	112
	Saw, circular, wood	CNP 201	1	108	108
	Lorry	CNP 141	1	112	112
				Total SWL	116
Concreting	Crane, mobile	CNP 048	1	112	112
	Concrete lorry mixer	CNP 044	1	109	109
	Compactor, vibratory	CNP 050	1	105	105
				Total SWL	114
Cabling	Conveyor belt	CNP 041	1	90	90
	Generator	CNP 102	1	100	100
	Hoist	CNP 122	1	95	95
	Winch	CNP 262	1	95	95
				Total SWL	102

Note(s):
1 Apart from CNP164, (CNP165-Piling, large diameter bored, oscillator) or (CNP166-Piling, large diameter bored, reverse circulation drill) may be used instead for the construction activities.

Table 4.8Plant Inventory for Nei Lak Shan/Towers T3, T4, T5, T6 and T7 (No Mitigation Measures)

	PME	TM Ref.	No.	SWL/Unit, dB(A)	Sub-SWL, dB(A)
	*Site Formation and Excavation*
Site Foundation and Excavation	Breaker, hand-held, mass > 35kg	CNP 026	1	114	114
	Air compressor, air flow <10m³/min	CNP 001	1	100	100
	Helicopter⁽¹⁾	-	1	92	92
				Total SWL	114
	*Substructure*
Piling	Mini Piling Rig⁽²⁾	-	1	113	113
	Helicopter	-	1	92	92
				Total SWL	113
Concreting	Compactor, vibratory	CNP 050	1	105	105
	Helicopter	-	1	92	92
				Total SWL	105
	*Superstructure*
Formwork and Reinforcement	Helicopter	-	1	100	100
				Total SWL	100
Concreting	Compactor, vibratory	CNP 050	1	105	105
	Helicopter	-	1	92	92
				Total SWL	105
Cabling	Conveyor belt	CNP 041	1	90	90
	Generator	CNP 102	1	100	100
	Hoist	CNP 122	1	95	95
	Winch	CNP 262	1	95	95
				Total SWL	102

Note(s):

1. Maximum SWL of helicopter is 100dB(A) and assume 5 minutes duration within every 30 minutes during transportation [ i.e. 10*log(10100/10x5mins/30mins) = 92 dB(A)]

2. Refer to Table C.10, item 6 of BS5228 for SWL

As the Theme Village is still at the conceptual stage, no plant inventory has yet been defined. However, to allow the cumulative impacts to be addressed a maximum noise level of 75 dB(A) has been included in the cumulative impact assessment for the construction of the Theme Village in the assessments.

Due to the remote nature of work sites for the tower locations, helicopters or a temporary material~~aerial~~ ropeway could be used to transport construction materials to the tower sites (noting that the latter is not favoured). The use of helicoptersis will not only minimize the environmental impacts but also reduce the disturbance to the Country Park as compared to the use of a haul road (in the unlikely event that the use of a haul road~~were that to~~ would be permitted).

Use of Helicopters

Due to the remoteness of the construction site and the flexibility of flight paths, it is expected that helicopters are most likely to be used to convey materials to site. The Cable Car system Contractor has proposed two types of helicopters (Vladivostok Air - Helicopter Type KA-32 and Erickson Aircrane - Helicopter Type S64) with maximum sound power level (i.e. 100dB(A) during flyover) for use on this project. According to the proposed alignment, work sites (i.e. Towers 3, 4, 5, 6, 7 and the Nei Lak Shan Angle Station) are inaccessible construction sites (i.e. cannot be accessed by existing roads/footpaths and no new haul roads will be constructed in the Country Park). Work site (i.e. Tower 7) is the closest noise source to NSRs.In this connection, helicopter is considered as a piece of PME and incorporated into the plant inventory for Nei Lak Shan/Towers. The noise level generated by the helicopter landing/taking-off at work sites has been modeled as a point source and assumed 5 minutes duration within every 30 minutes during transportation. Hence, the sound power level of helicopter during transportation is converted~~nected~~to 92 dB(A). Moreover, calculations have been conducted to predict the maximum sound pressure level of the helicopter at the facades of the representative NSRs using basic acoustic principles and the results are incorporated in all relevant Tables of Part A of Annex H.

Landing / Taking-off at Touch Down Points

Two potential touch down points (i.e. Airport Island and Tung Chung Bay as shown in Figure 4.3) have been proposed for the construction stage. Please note that these will not be used for the operational stage which requires rescue touch down points (i.e. three located in the Country Park far from sensitive receivers, refer to Figure 2.14). The closest sensitive receiver to the touch down points is Village Houses at Tin Sum (i.e. NSR8) . The noise impact due to the helicopter operation at the touch down point has been modeled as a point source. Moreover, calculations have been conducted to predict the maximum sound pressure level generated from the helicopter at the facades of the representative NSRs using basic acoustic principles as follows.

L_eq(predicted) = L_eq(reference) – 20 log [D(nsr-source) / D(reference-source)] + 3 (*)

Where

L_eq(predicted) is the predicted maximum noise level in dB(A);

L_eq(reference) is the predicted maximum noise level being monitored;

D(nsr-source) is the distance (in metres) from noise sensitive receiver to noise source; and

D(reference-source) is the distance (in metres) from referenced monitoring location to noise source.

The maximum noise level at this receiver ~~as shown in Table 4.??~~ is36dB(A) with the separation of 345 metres which complies with 75dB(A) noise criterion. The details are shown in Part B of Annex H. All proposed touch down points are therefore acceptable from a noise perspective.

Flight Path

According to the Hong Kong’s Civil Aviation Department requirements, helicopters must operate over the 152 metres (i.e. 500 ft) threshold above residential properties. Hence, based on this restricted separation, it can be seen that the maximum noise level is 43 dB(A) at 152 metres which complies with the 75 dB(A) noise criterion. The details of the flight path can only be agreed within Civil Aviation Department when the Contractor presents a construction plan for approval. However, the flight path is anticipated to be along cable car alignment and the nearest sensitive receiver to the touch down points is village houses at Tin Sum (i.e. NSR8). As discussed in preceding paragraph, the noise level at the receiver is in compliance with noise criterion.

4.6 Evaluation of Impacts

Construction Works and Percussive Piling

The source of noise nuisance during construction is primarily from the use of Powered Mechanical Equipment (PME) on site. According to the presumed plant inventory, the total Sound Power Level (SWL) associated with each construction activity has been established and the details are contained in Tables 4.6 and 4.7.

~~Table 4.6Plant Inventory for One Tower Site (No mitigation Measures)~~

~~Table 4.7Plant Inventory for Terminals/Angle Stations (No mitigation Measures)~~

* This equipment is not applicable at the Nei Lak Shan Angle Station as the materials will be transported by helicopter.

In order to predict the noise level in worse case scenario it has been assumed that construction at tower sites (~~T1 and~~ T7) totally overlaps with the noisiest activities at the terminalsi, airport island angle station (i.e. site ~~information~~ foundation and excavation or ~~foundation~~ substructure or superstructure depending on the overall maximum sound power level of each noisy activity) and Ngong Ping STW. The cumulative effect of construction of the Ngong Ping Terminal, Tower (T7) and Ngong Ping STW ~~and~~ as well as asthe Tung Chung Terminal and ~~Tower (T1)~~ Airport Island Angle Station have been assessed respectively. The results are shown in Tables 4.9, 4.12 and 4.14 and the detailed calculation sheets are presented ~~and shown~~ in Tables A1-3 in Part A of Annex H ~~4.8 below~~.

As As part of the construction work for Ngong Ping STW will be carried out concurrently with Cable Car project (Ngong Ping Area) and in order to predict the worse case scenario, the noisiest activities (i.e. site formation/earthworks/rock breaking) have been chosen for the construction noise assessment.

Table 4.89 Cumulative Noise Impacts for Cable Car Project (No mitigation Measures) - (L_eq.30mindB(A))

NSRs	Area	Location	~~Net~~ Noise Impacts from Cable Car Project 1 /dB(A)			Noise Impacts from Ngong Ping STW 1 /dB(A)	Cumulative Noise Impacts 1 /dB(A)
NSRs	Area	Location	Tower Site	Terminals	Airport Island Angle Station	Site Formation/ Earthworks/ rock breaking	Cumulative Noise Impacts 1 /dB(A)
NSR1a		Village houses - Kam Wai Yuen~~Village houses~~	59	76	N/A	73	78
NSR1b	Ngong Ping	Village houses along Ngong Ping Road near bus terminus~~Village houses along Ngong Ping Road near bus terminus~~	55	67	N/A	69	72
NSR2	~~Ngong Ping~~	Tin Tan Buddha Status~~Tin Tan Buddha Status~~	50	63	N/A	65	67
NSR3		Lin Chi Monastery~~Lin Chi Monastery~~	61	66	N/A	64	69
NSR4		Tung Chung Crescent - Block 7 (Flat A)~~Tung Chung Crescent~~	N/A	85	64	N/A	85
NSR5	Tung Chung	Fu Tung Estate - Tung Ma House (Flat 03)~~Fu Tung Estate~~	N/A	68	61	N/A	69
NSR6	~~Tung Chung~~	Seaview Crescent - Block 1 (Flat D)~~Seaview Crescent~~	N/A	68	62	N/A	69
NSR7		Wan Ho Kan Primary School~~Wan Ho Kan Primary School~~	N/A	68	60	N/A	67
Notes: 1. Bold figure exceeds noise criteria 2. N.A. denotes Not Applicable 3. Façade effect is considered for all NSRs excepted NSR2 4. Information extracted from Table 4.8 of Section 4 of approved EIA report under register no. EIA-079/2002 “Ngong Ping Sewage Treatment Works and Sewerage”

As shown in Table 4.9~~D1 in Part D of Annex H~~, ~~The~~ it~~predictions~~ indicates that the cumulative noise impact of both unmitigated construction ~~of Annex H~~ activities associated with the construction of the Terminal (i.e. site ~~formation~~foundation and excavation) ~~and~~, Tower Site, Airport Island Angle Station (only applicable for Tung Chung Area) and mitigated construction activities relating to the construction of Ngong Ping STW (only applicable for Ngong Ping Area), would cause exceedance of the daytime construction noise criterion by 35dB(A) (i.e. NSR1a of Ngong Ping Area) and 10dB(A) (i.e. NSR4 of Tung Chung Area). Approximately 600 dwellings of NSR 4 and 10 dwellings of NSR1a ~~owuld~~ would bebe ~~expressed~~ exposed to~~the~~ excessive noise levels. The results further indicate that the major noise contribution to the affected receiver is the noise impacts from the plant inventory of construction of both Terminals. The duration of the construction activities are about one year. Mitigation measures are therefore required for these NSRs in order to alleviate the noise impacts generated from cable car project.

At the Airport Angle Station, rock excavation will be required and three impact hammers (i.e. Breaker, excavator mounted (pneumatic) – (CNP027) and two backactors (i.e. Bulldozer – (NP 030) would be used. The cumulative sound power level is 127 dB(A). The nearest receiver Tung Chung Crescent (i.e. NSR 4) from the Airport Angle Station is over 720m from the source. The noise level at the nearest receiver after taking into account distance attenuation (i.e. 62 dB(A)) is 65 dB(A), which complies with the noise criterion. No mitigation measures are therefore required other than:

·~~good site practice to limit noise emissions at source~~

·~~selection of quieter plant and working methods~~

~~The following suite of practical and implementable mitigation measures has already been included in MTRC’s General Specification:~~

Noise Mitigation Measures

Good site practice and noise management can significantly reduce the impact of construction site activities on nearby NSRs. The following package of measures should be followed during of construction:

· only well-maintained plant should be operated on-site and plant should be serviced regularly during the construction works;

· machines and plant that may be in intermittent use should be shut down between work periods or should be throttled down to a minimum;

· plant known to emit noise strongly in one direction, should, where possible, be orientated to direct noise away from the NSRs;

· mobile plant should be sited as far away from NSRs as possible; and

· material stockpiles and other structures should be effectively utilised, where practicable, to screen noise from on-site construction activities.

The following sections describe measures which may be considered to reduce noise to acceptable levels, using monitoring to confirm the acceptability of the proposed mitigation.

Selecting Quieter Plant and Working Methods

The Contractor may be able to obtain particular models of plant that are quieter than standards given in GW-TM. Benefits which can be achieved through this approach will depend on the details of the Contractor chosen methods of working. As it is considered too restrictive to define specific items of plant for the construction operations, it is more practical to specify an overall plant noise performance specification to apply to the total SWL of all plant on the site so that the Contractor is allowed some flexibility to select plant to suit his needs.

Quiet plant is defined as PME whose actual SWL is less than the value specified in GW-TM for the same piece of equipment. Examples of SWLs for specific silenced PME taken from a British Standard, namely Noise Control on Construction and Open Sites, BS 5228 : Part 1 : 1997, which are known to be used are given in Table 4.109.

Table 4.109 Sound Power Levels for Specific Silenced PME

PME	BS 5228 Table no	Ref no	SWL dB(A) max
Generator~~Bulldozer~~	C.7~~C.3~~	6652	1~~110~~00

Excavator~~Air compressor~~	C.3~~C.7~~	9725	10598

Breaker, excavator mounted (hydraulic)~~Concrete Pump~~	C.8~~C.6~~	1336	110~~106~~

Dump Truck~~Dump Truck~~	C.9~~C.9~~	2929	109~~109~~

Concrete Lorry Mixer~~Concrete Lorry Mixer~~	C.6~~C.6~~	3535	100~~100~~

Lorry~~Road Roller~~	C.9~~C.8~~	2727	105~~104~~

Mobile Crane~~Poker Vibrator~~	C.7~~C.6~~	11832	99~~100~~

Chain Saw~~Chain Saw~~	C.7~~C.7~~	7878	106~~106~~

Table 4.11Plant Inventory for Ngong Ping/Tung Chung Terminals (Using quiet pplant)~~Ngong Ping/Tung Chung Terminals~~

	PME	TM Ref. /BS5228	No.	SWL/Unit, dB(A)	Sub-SWL, dB(A)
	*Site Formation and Excavation*
Site Foundation and Excavation	Breaker, excavator mounted (hydraulic)*	C.8-13	1	110	110
	Excavator*	C.3-97	1	105	105
	Dump Truck*	C.9-29	1	109	109
				Total SWL	113
	*Substructure*
Piling	Piling, large diameter bored⁽¹⁾	CNP 164	1	115	115
	Excavator*	C.3-97	1	105	105
	Bar bender and cutter (electric)	CNP 021	1	90	90
	Generator, standard*	C.7-62	1	100	100
	Dump Truck*	C.9-29	1	109	109
				Total SWL	116
Pile Cap	Bar bender and cutter (electric)	CNP 021	1	90	90
	Generator, standard*	C.7-62	1	100	100
	Lorry*	C.9-27	1	105	105
				Total SWL	106
Concreting	Crane, mobile*	C.7-118	1	99	99
	Concrete lorry mixer*	C.6-35	1	100	100
	Compactor, vibratory	CNP 050	1	105	105
				Total SWL	107
	*Superstructure*
Formwork and Reinforcement	Bar bender and cutter (electric)	CNP 021	1	90	90
	Generator, standard*	C.7-62	1	100	100
	Crane, mobile*	C.7-118	1	99	99
	Saw, circular, wood*	C.7-78	1	106	106
	Lorry*	C.9-27	1	105	105
				Total SWL	110
Concreting	Crane, mobile*	C.7-118	1	99	99
	Concrete lorry mixer*	CNP 044	1	100	100
	Compactor, vibratory	CNP 050	1	105	105
				Total SWL	107
Cabling	Conveyor belt	CNP 041	1	90	90
	Generator	CNP 102	1	100	100
	Hoist	CNP 122	1	95	95
	Winch	CNP 262	1	95	95
				Total SWL	102

Note(s):

1. Apart from CNP164, (CNP165-Piling, large diameter bored, oscillator) or (CNP166-Piling, large diameter bored, reverse circulation drill) may be used instead for the construction activities.

2. '*' denotes quiet alternative is used in accordance with BS5228, 1997

With quiet plant (as described in Table 4.109 above) substituted in the equipment inventories given in Table 4.11 s ~~4.10 and 4.11~~, the cumulative noise impact of both unmitigated construction activities associated with the construction of Ngong Ping Terminal, ~~and~~ Tower Site, Airport Island Angle Station and mitigated construction activities related to the construction of Ngong Ping STW, would be further reduced as shown in Table4.12.

Table 4.12 Cumulative Noise Impacts for Cable Car Project (Using Quiet Plant) - (L_eq.30mindB(A))

NSRs~~NSRs~~	Area~~Area~~	Location~~Location~~	Noise Impacts from Cable Car Project /dB(A)~~Net Noise Impacts from Cable Car Project~~ ~~1 dB(A)~~			Noise Impacts from Ngong Ping STW /dB(A)~~Noise Impacts from Ngong Ping STW~~ ~~1 dB(A)~~	Cumulative Noise Impacts /dB(A)~~Cumulative Noise Impacts~~ ~~1 dB(A)~~
NSRs~~NSRs~~	Area~~Area~~	Location~~Location~~	Tower Site ~~Tower Site~~	Terminals ~~Terminals~~	Airport Island Angle Station~~Airport Island Angle Station~~	Site Formation/ Earthworks/ rock breaking
NSR1a~~NSR1a~~		Village houses - Kam Wai Yuen~~Village houses~~	59	66	N/A~~N/A~~	73	75
NSR1b~~NSR1b~~	Ngong Ping	Village houses along Ngong Ping Road near bus terminus~~Village houses along Ngong Ping Road near bus terminus~~	55	60	N/A~~N/A~~	69	70
NSR2~~NSR2~~	~~Ngong Ping~~	Tin Tan Buddha Status~~Tin Tan Buddha Status~~	50	56	N/A~~N/A~~	65	66
NSR3~~NSR3~~		Lin Chi Monastery~~Lin Chi Monastery~~	61	59	N/A~~N/A~~	64	67
NSR4~~NSR4~~		Tung Chung Crescent - Block 7 (Flat A)~~Tung Chung Crescent~~	N/A~~N/A~~	77	64	N/A	78
NSR5~~NSR5~~	Tung Chung	Fu Tung Estate - Tung Ma House (Flat 03)~~Fu Tung Estate~~	N/A~~N/A~~	61	61	N/A	64
NSR6~~NSR6~~	~~Tung Chung~~	Seaview Crescent - Block 1 (Flat D)~~Seaview Crescent~~	N/A~~N/A~~	61	62	N/A	64
NSR7~~NSR7~~		Wan Ho Kan Primary School~~Wan Ho Kan Primary School~~	N/A~~N/A~~	59	60	N/A	62
Notes: 1. Bold figure exceeds noise criteria 2. N.A. denotes Not Applicable 3. Façade effect is considered for all NSRs excepted NSR2 4. Information extracted from Table 4.8 of Section 4 of approved EIA report under register no. EIA-079/2002 “Ngong Ping Sewage Treatment Works and Sewerage” ~~Notes:~~ ~~Bold figure exceeds noise criteria~~ ~~N.A. denotes Not Applicable~~ ~~Façade effect is considered for all NSRs excepted NSR2~~

~~Table 4.10 Plant Inventory for One Tower Site (Using Quiet Plant)~~

*~~Items replaced by quiet plant~~

~~Table 4.11 Plant Inventory for Terminals (Using Quiet Plant)~~

*~~Items replaced by quiet plant~~

~~Table 4.12 Cumulative Noise Impacts for Cable Car Project (Using Quiet Plant) - (L~~_eq.30min~~dB(A))~~

~~Table 4.13~~ The results indicates that with the use of quiet plant under the construction of Terminal ~~and Tower Site~~, the cumulative noise impact of both mitigated construction activities associated with the construction of Tung Chung Terminal (i.e. ~~foundation~~substucture) and ~~Tower Site~~ Airport Island Angle Station would cause exceedance of the daytime construction noise criterion by 4 3 dB(A) at NSR4 in the Tung Chung Area. Approximately 600 dwellings of NSR4 would be exposed ~~the~~ to excessive noise levels. The results further indicate that the major contribution to the affected received in the noise impacts from the plant inventory of construction of both terminals. The duration of the construction activities are about one year. Further mitigation measures are therefore required in order to alleviate the noise impacts generated during construction of the Cable Car Project ~~at NSR4~~.

Construction of Movable Noise Barriers

Movable barriers can be very effective in screening noise from particular items of plant when constructing the Tung Chung and Ngong Ping Terminal. A noise barrier located close to the noise generating component of a PME could produce at least 10 dB(A) screening for stationary plant and 5 dB(A) for mobile plant provided it blocked the direct line of sight between the PME and the NSR. The noise screening benefit for each item of plant considered in this assessment is listed as follows:

· ~~stationary plant - assuming 10 dB(A) reduction: air compressor, concrete pump, lorry mixer, poker vibrator and bar bender;~~

· mobile and items of large plant - assuming 5 dB(A) reduction: piling, large diameter bored~~rock driller and compactor~~.

Table 4.13 Plant Inventory for Ngong Ping/Tung Chung Terminals (Using movable noise barrier)

	PME	TM Ref. /BS5228	No.	SWL/Unit, dB(A)	Sub-SWL, dB(A)
	*Site Formation and Excavation*
Site Foundation and Excavation	Breaker, excavator mounted (hydraulic)*	C.8-13	1	110	110
	Excavator*	C.3-97	1	105	105
	Dump Truck*	C.9-29	1	109	109
				Total SWL	113
	*Substructure*
Piling	Piling, large diameter bored⁽¹⁾#	CNP 164	1	110	110
	Excavator*	C.3-97	1	105	105
	Bar bender and cutter (electric)	CNP 021	1	90	90
	Generator, standard*	C.7-62	1	100	100
	Dump Truck*	C.9-29	1	109	109
				Total SWL	113
Pile Cap	Bar bender and cutter (electric)	CNP 021	1	90	90
	Generator, standard*	C.7-62	1	100	100
	Lorry*	C.9-27	1	105	105
				Total SWL	106
Concreting	Crane, mobile*	C.7-118	1	99	99
	Concrete lorry mixer*	C.6-35	1	100	100
	Compactor, vibratory	CNP 050	1	105	105
				Total SWL	107
	*Superstructure*
Formwork and Reinforcement	Bar bender and cutter (electric)	CNP 021	1	90	90
	Generator, standard*	C.7-62	1	100	100
	Crane, mobile*	C.7-118	1	99	99
	Saw, circular, wood*	C.7-78	1	106	106
	Lorry*	C.9-27	1	105	105
				Total SWL	110
Concreting	Crane, mobile*	C.7-118	1	99	99
	Concrete lorry mixer*	CNP 044	1	100	100
	Compactor, vibratory	CNP 050	1	105	105
				Total SWL	107
Cabling	Conveyor belt	CNP 041	1	90	90
	Generator	CNP 102	1	100	100
	Hoist	CNP 122	1	95	95
	Winch	CNP 262	1	95	95
				Total SWL	102

Note(s):

1. Apart from CNP164, (CNP165-Piling, large diameter bored, oscillator) or (CNP166-Piling, large diameter bored, reverse circulation drill) may be used instead for the construction activities.

2. '*' denotes quiet alternative is used in accordance with BS5228, 1997

3. '#' denotes the movable noise is used

The effect of the use of quiet plant and using movable barriers (as described in Table 4.13) has been investigated for the practicable construction activities and the results are presented in Table 4.14.

Table 4.14 Cumulative Noise Impacts for Cable Car Project (Using Noise Barrier at terminals) - (L_eq.30mindB(A))

NSRs~~NSRs~~	Area~~Area~~	Location~~Location~~	Noise Impacts from Cable Car Project /dB(A)~~Net Noise Impacts from Cable Car Project~~ ~~1 dB(A)~~			Noise Impacts from Ngong Ping STW /dB(A)~~Noise Impacts from Ngong Ping STW~~ ~~1 dB(A)~~	Cumulative Noise Impacts /dB(A)~~Cumulative Noise Impacts~~ ~~1 dB(A)~~
NSRs~~NSRs~~	Area~~Area~~	Location~~Location~~	Tower Site ~~Tower Site~~	Terminals ~~Terminals~~	Airport Island Angle Station~~Airport Island Angle Station~~	Site Formation/ Earthworks/ rock breaking
NSR1a~~NSR1a~~		Village houses - Kam Wai Yuen~~Village houses~~	59	66	N/A~~N/A~~	73	74
NSR1b~~NSR1b~~	Ngong Ping	Village houses along Ngong Ping Road near bus terminus~~Village houses along Ngong Ping Road near bus terminus~~	55	57	N/A~~N/A~~	69	70
NSR2~~NSR2~~	~~Ngong Ping~~	Tin Tan Buddha Status~~Tin Tan Buddha Status~~	50	53	N/A~~N/A~~	65	66
NSR3~~NSR3~~		Lin Chi Monastery~~Lin Chi Monastery~~	61	56	N/A~~N/A~~	64	66
NSR4~~NSR4~~		Tung Chung Crescent - Block 7 (Flat A)~~Tung Chung Crescent~~	N/A~~N/A~~	74	64	N/A	75
NSR5~~NSR5~~	Tung Chung	Fu Tung Estate - Tung Ma House (Flat 03)~~Fu Tung Estate~~	N/A~~N/A~~	58	61	N/A	63
NSR6~~NSR6~~	~~Tung Chung~~	Seaview Crescent - Block 1 (Flat D)~~Seaview Crescent~~	N/A~~N/A~~	58	62	N/A	63
NSR7~~NSR7~~		Wan Ho Kan Primary School~~Wan Ho Kan Primary School~~	N/A~~N/A~~	56	60	N/A	61
Notes: 1. Bold figure exceeds noise criteria 2. N.A. denotes Not Applicable 3. Façade effect is considered for all NSRs excepted NSR2 1. Information extracted from Table 4.8 of Section 4 of approved EIA report under register no. EIA-079/2002 “Ngong Ping Sewage Treatment Works and Sewerage”~~Notes:~~ 1. ~~Bold figure exceeds noise criteria~~ 1. ~~N.A. denotes Not Applicable~~ 4. ~~Façade effect is considered for all NSRs excepted NSR2~~

With the incorporation of quiet plant, and the use of movable barriers (to reduce noise level at source) at the Terminal, Tthe results indicate that the cumulative noise impact of both mitigated construction activities associated with the construction of Terminal (i.e. substructure) at both Tung Chung and Ngong Ping, Airport Island Angle Station and Tower (together with the construction of Ngong Ping STW), would fully comply with the daytime construction noise criterion.

The mitigation measures described herein are a suite of measures which need to be considered in stages. The actual noise levels of the construction works should be checked and where necessary mitigation measures applied as required to reduce the noise to acceptable levels.

~~Table 4.13 Plant Inventory for Terminals (Using Noise Barrier)~~

*~~Items replaced by quiet plant~~

~~#Items mitigated by noise barriers~~

~~With the incorporation of quiet plant, and the use of movable barriers (to reduce noise level at source) at the Terminal, Table 4.14~~indicates that the cumulative noise impact of both mitigated construction activities associated with the construction of Terminal (site formation) and towers at both Tung Chung and Ngong Ping, (together with the construction of Ngong Ping STW), would fully comply with the daytime construction noise criterion.

~~Use of Helicopters~~

Due to the remoteness of the construction site and the flexibility of flight paths, it is expected that helicopters are most likely to be used to convey materials to site. Based on a commonly used helicopter (Aerospatiale-AS355), the L_max ~~dB(A) of the helicopter is 77dB(A)@153m and was used for the noise assessment under worst case scenario. However,~~ ~~the~~ ~~Cable Carsystemaccording to the~~cC~~ontractor~~ ~~has proposedinformation~~ ~~two~~ ~~types ofproposed~~ ~~helicopters (Vladivostok Air~~ -~~use~~ ~~Helicopter Type KA-32 and Erickson Aircrane~~ -~~use~~ ~~Helicopter Type S64) with relatively less sound pressure level (i.e. 48dB(A)@153m)~~ ~~for use on this projectwill be used for transportation~~. ~~Notwithstanding the foregoing the worst case scenario was considered.Hence, more conservative results were obtained.~~ According to the proposed alignment, the nearest noise sources are the work sites (i.e. Towers T3 and T7) and proposed touch down points (i.e. Airport Island, Tung Chung Bay and Ngau Tau Touch Down Points as shown in ~~Figure 4.3~~). The noise level generated by the helicopter landing/taking-off at work sites has been modeled as a point source. Moreover, calculations have been conducted to predict the maximum sound pressure level of the helicopter at the facades of the representative NSRs using basic acoustic principles and the results are shown in ~~Table 4.15~~.

~~Landing / Taking-off at Touch Down Points~~

~~As stated in the preceding section, three potential touch down points have been proposed~~ ~~for the construction stage~~. As shown in Table 4.15, the results indicate that full compliance is expected. The closest sensitive receiver is Lin Chi Temple (75 dB(A) under worst case scenario), and even at NSRs 8 and 9 which are closest to the touch down points (i.e. Village Houses at Tin Sum and Ngau Au) the noise standard can be achieved. All proposed touch down points are therefore acceptable from a noise perspective.

~~Landing / Taking-off at Work Sites~~

As stated in preceding section, work sites (i.e. Towers 3, 4, 5, 6, 7 and the Nei Lak Shan Angle Station) are inaccessible construction sites (i.e. cannot be accessed by existing roads/footpaths and no new haul roads will be constructed in the Country Park). Work sites (i.e. Towers 3 and 7) are the closest noise sources to NSRs. As shown in Table 4.15, the results indicate that the receivers at NSR 3 (i.e. Lin Chi Monastery) will not experience noise levels in excess of the criterion.

~~Flight Path~~

According to the Hong Kong’s Civil Aviation Department requirements, helicopters must operate over the 152 metres (i.e. 500 ft) threshold above residential properties. Hence, based on this restricted separation, it can be seen that the maximum noise requirement, as shown in Table 4.14~~for the helicopter, is 75 dB(A) at 152 metres which complies with the 75 dB(A) noise criterion.~~ ~~The details of the flight path can only be agreed within~~ C~~ivil~~ ~~Aviation Department when the Contractor presents a construction plan for approv~~al~~. Assessments contained herein have considered the worst case situation.~~

~~Table 4.15 Predicted Helicopter Noise- (LmaxdB(A))~~

Material Ropeway

For similar reasons as those given for the helicopter, a material ropeway is another alternative to transport construction materials to the remote sites. As the material ropeway is not expected to generate noise except at the Angle Station and the distance between the Angle Station and the nearest sensitive receiver (i.e. NSR 3 - Lin Chi Monastery) is over 1200m, the distance attenuation is over 60 dB(A). Hence, it can be concluded that the noise impact generated from the temporary aerial ropeway system is insignificant.

It should be noted that helicopters would still be required to ~~take~~ deliver materials to site to construct the ropeway and the comments in the preceding section apply.

Notwithstanding the foregoing the use of a material ropeway is not recommended on ecological or visual grounds.

4.7 Potential Operational Noise Impact

During the operational phase, noise generated from the operation of the project essentially relates to the use of mechanical equipment at the Tung Chung Terminal and Ngong Ping Terminal, and the wheel ~~“squeal”~~ or chatter from the cable car runners passing over the ropeway~~cars using the cable car system~~.

4.8 Evaluation of Impacts

Tung Chung Terminal/Ngong Ping Terminal/Airport Angle Station

No Minor mechanical equipment will be installed at the cable car ~~termini~~Terminals, (i.e Tung Chung Terminal and Ngong Ping Terminal) only wheels and electrical motor for turning the operating system. The noise generated from t~~driving wheel~~ hose is insignificant. Major mechanical equipment will be installed at the Angle Stations of Airport Island ~~at Tung Chung~~ and at Nei Lak Shan.

In the current engineering design, all the potential noise sources (i.e. all mechanical equipment) shall be fully enclosed within the building structure. It is assumed that all the mechanical equipment installed at the Angle Stations of Airport Island and Nei Lak Shan will be housed inside concrete building or other suitable material with at least 20 dB(A) noise reduction.

Cable Car travelling along the Ropeway

Discrete noise impacts, “wheel ~~squeal~~/chatter” or “clamp shock”, will be generated from the cable car runners passing over the ropeway.

Evaluation

Normal operation of the cable car is assumed to be within the period 0700 to 2300 hours. and 2300to 0700 hours (for special occasion such as Buddha’s Birthday) The relevant noise guidelines for ASR “A” daytime/evening of 55 dB(A) and night-time of 450 dB(A) as well as for ASR “C” daytime/evening of 65 dB(A) and night-time of 55 dB(A) areis adopted as discussed in preceding section 4.2. An assessment of operational noise impacts at the nearest receiver was made based on standard acoustic principles after taking into account the distance attenuation and façade correction.

Also, due to the noise impacts of the mechanical equipment from terminal and cable car travelling along the ropeway and in order to predict the noise level generated from both concurrent activities at the receivers under worst case scenario, it has been assumed that the maximum noise level arising from the Terminals (i.e. Tung Chung Terminal and Ngong Ping Terminal) and Towers (i.e. T1 and T7) at the nearest receiver were used for assessment purpose.

~~Regarding the operational noise impact from Nei Lak Shan Angle Station and Airport Angle Station, a~~A~~s the distance from Ngong Ping Terminal (i.e. 270m) is far shorter than from Nei Lak Shan Angle Station (i.e. 1500m) at Lin Chi Monastery (i.e. NSR3), and~~ ~~. Similarly,~~ ~~the distance from Tung Chung Terminal (i.e. 50m) is far shorter than from the Airport Angle Station (i.e. 720m) at Tung Chung Crescent (i.e. NSR4)~~, ~~. Hence,~~ ~~the noise contribution from Ngong Ping Terminal and Tung Chung Terminal~~ ~~respectively~~ ~~were used for~~ ~~the~~ ~~assessment purpose~~s.

Also, sound ~~power~~ pressure level of the mechanical equipment from terminal and cable car travelling along the ropeway are 85 dB(A) and 75 dB(A) respectively ~~85 dB(A)~~ ~~and 75 dB(A) respectively~~based on measurements 0.8m above platform level with the horizontal distance of 2.5m. According to the proposed alignment, the nearest noise sources are arising from the ~~Termini~~Terminals (i.e. Tung Chung Terminal and Ngong Ping Terminal) and Towers (i.e. T1 and T7).

~~Therefore no noise impact due to mechanical noise and the wheel (chatter) from the cable car travelling along the ropeway at the nearest receiver is expected.~~ The noise impact due to the mechanical equipment from the terminal and cable car travelling along the ropeway at each tower location, has been modeled as a point source. Moreover, calculations have been conducted to predict the maximum sound pressure level generated from the Terminal and cable car system at the facades of the representative NSRs using basic acoustic principles as follows. ~~and~~ Tthe results are shown in Tables 4.1516 ~~and 4.~~ and the details are shown in Part C~~E and F~~ of Annex H17.

L_eq(predicted) = L_eq(reference) – 20 log [D(nsr-source) / D(reference-source)] + 3 (*)

Where

L_eq(predicted) is the predicted maximum noise level in dB(A);

L_eq(reference) is the predicted maximum noise level being monitored;

D(nsr-source) is the distance (in metres) from noise sensitive receiver to noise source; and

D(reference-source) is the distance (in metres) from referenced monitoring location to noise source.

Table 4.115 6 ~~Predicted~~ Cumulative Noise Level for Terminal and Cable Car Travelling along the Ropeway - (L_eq.30mindB(A))

NSRs	Area	Location	Noise Impact from Terminal Location (Ngong Ping, Tung chung) /dB(A)	~~Distance from terminal to the receiver/m~~Noise Impact from Tower Site (T1, T7)/dB(A)	~~Predicated~~ Cumulative Noise Level/dB(A)	Noise Criteria /dB(A)
NSR1a		Village houses - Kam Wai Yuen~~Village houses~~	53~~Ngong Ping~~	36~~140~~	53~~<45~~	45
NSR1b	Ngong Ping	Village houses along Ngong Ping Road near bus terminus~~Village houses along Ngong Ping Road near bus terminus~~	45~~Ngong Ping~~	32~~370~~	45~~<45~~	45
NSR2	~~Ngong Ping~~	Tin Tan Buddha Status~~Tin Tan Buddha Status~~	40~~Ngong Ping~~	3~~440~~0	40~~<45~~	45
NSR3		Lin Chi Monastery~~Lin Chi Monastery~~	44~~Ngong Ping~~	37~~410~~	45~~<45~~	45
NSR4		Tung Chung Crescent - Block 7 (Flat A)~~Tung Chung Crescent~~	62~~Tung Chung~~	3750	6246	55
NSR5	Tung Chung	Fu Tung Estate - Tung Ma House (Flat 03)~~Fu Tung Estate~~	46~~Tung Chung~~	31~~330~~	46<45	55
NSR6	~~Tung Chung~~	Seaview Crescent - Block 1 (Flat D)~~Seaview Crescent~~	45~~Tung Chung~~	32~~340~~	46<45	55
NSR7		Wan Ho Kan Primary School~~Wan Ho Kan Primary School~~	43~~Tung Chung~~	29~~440~~	43<45	55
Note(s): 1. Façade effect is considered for all NSRs excepted NSR2 2. Night-time criteria (planning) is adopted as assessment standard

~~Table 4.~~17 ~~Predicted Noise Level for Cable Car travelling along the Ropeway - (L~~_eq.30min~~dB(A))~~

~~Note(s):~~

1.~~Façade effect is considered for all NSRs excepted NSR2~~

Table 4.15 indicates that operational noise impact generated from Ngong Ping Terminal, Tower (7) as well as Tung Chung Terminal and Tower (1) would cause exceedance of noise criterion by 8 dB(A) at NSR1a and by 7 dB(A) at NSR4.

The main source at the Terminals is the tensioning system which is driven by an electrical motor. It is recommended that an acoustic enclosure is providedto house the electrical motor. Provision of an acoustic enclosure could reduce noise levels by between 10dB(A) and 20dB(A). The results after mitigation (by reduction of 10 dB(A)) are shown in Table 4.16.

Table 4.16 Cumulative Noise Level for Terminal and Cable Car Travelling along the Reopeway (with Mitigation Measures)- (L_eq.30mindB(A))

NSRs	Area	Location	Noise Impact from Terminal Location (Ngong Ping, Tung chung) /dB(A)	Noise Impact from Tower Site (T1, T7)/dB(A)	Cumulative Noise Level /dB(A)	Noise Criteria /dB(A)
NSR1a		Village houses - Kam Wai Yuen	43	36	44	45
NSR1b	Ngong Ping	Village houses along Ngong Ping Road near bus terminus	35	32	36	45
NSR2		Tin Tan Buddha Status	30	30	33	45
NSR3		Lin Chi Monastery	34	37	39	45
NSR4		Tung Chung Crescent - Block 7 (Flat A)	52	37	52	55
NSR5	Tung Chung	Fu Tung Estate - Tung Ma House (Flat 03)	36	31	37	55
NSR6		Seaview Crescent - Block 1 (Flat D)	35	32	37	55
NSR7		Wan Ho Kan Primary School	33	29	35	55
Note(s): 1. Façade effect is considered for all NSRs excepted NSR2 2. Night-time criteria (planning) is adopted as assessment standard~~1. 2.~~

After provision of mitigation measures (i.e. acoustic enclosure), Table 4.16 shows that the noise levels at receiver comply with noise criterion.

Hence, it can be concluded that the planned development would not be impacted by the operational noise provided that the separation between the planned receivers at Ngong Ping Terminal and Tung Chung Terminal are not less than 140m and 50m respectively.

4.9 Conclusions

Construction Phase

~~No exceedance of the noise criterion is expected at Ngong Ping.~~ The most seriously affected area is village houses in Ngong Ping Area (at NSR1a) and Tung Chung Crescent in the Tung Chung Area (at NSR4) where unmitigated noise levels of up to 78 and 8581 dB(A) respectively are predicted due to construction of Tung Chung Terminal and Tower T1.

Therefore, adequate control measures will be necessary for the works of Cable Car project in order to meet the standards required. Approximately 600 dwellings of Tung Chung Crescent (NSR4) and ~~a few~~ 10 dwellings of village houses (NSR1a) would be exposed to excessive noise levels. After implementing mitigation measures such as the use of quiet plant, erection of movable noise barrier and the adoption of regular noise monitoring during construction phase, the noise criteria for this project can be achieved and approximately 600 dwellings (all) will be protected.

It is also recommended that regular monitoring of noise at NSR1a - Village houses ~~NSR3 - Lin Chi Monastery~~ (Ngong Ping) and at NSR4 - Tung Chung Crescent (Tung Chung) is carried out during the construction phase.

Good site practice and noise management should be implemented to significantly reduce the impact of construction site activities on nearby NSRs. The package of measures to~~should~~ be considered~~followed~~ during each phase of construction include~~such as~~:-

· only well-maintained plant should be operated on-site and plant should be serviced regularly during the construction works;

· machines and plant that may be in intermittent use should be shut down between work periods or should be throttled down to a minimum;

· plant known to emit noise strongly in one direction, should, where possible, be orientated to direct noise away from the NSRs;

· mobile plant should be sited as far away from NSRs as possible; and

· material stockpiles and other structures should be effectively utilised, where practicable, to screen noise from on-site construction activities.

The use of helicopters for construction works would comply with the noise standards. All potential work sites would be acceptable from a noise perspective.

Operational Phase

With the mitigation measures proposed such as housing all mechanical equipment inside a concrete building with at least 20 dB(A) noise reduction (for the Airport Angle Station) or using ~~or using~~ ~~then~~ suitable material with at least 120 dB(A) noise reduction (i.e. installation of acoustic enclosure of the electrical motor at the terminals) and design standards imposed, noise generated as a result of this project would meet the required standards.