3 air quality

3.1 Introduction

This section presents the assessment of the potential air quality impacts arising from the construction and operation of the Designated and Potentially Designated Elements of the Project.

3.2 Relevant Legislation and Guidelines

The principal legislation for the management of air quality is the Air Pollution Control Ordinance, Cap 311 (APCO). The Hong Kong Air Quality Objectives (HKAQOs) stipulate statutory limits for air pollutants, as presented in Table 3.2a.

Table 3.2a Hong Kong Air Quality Objectives (mgm^-3) ^(a)

Pollutant	Averaging Time
	1 Hours	24 Hours ^(b)	1 Year ^(c)
Total Suspended Particulates (TSP)	-	260	80
Notes: (a) Measured at 298K (25°C) and 101.325 kPa (one atmosphere) (b) Not to be exceeded more than once per year (c) Arithmetic mean

In addition, the Technical Memorandum of Environmental Impact Assessment Ordinance (EIAO-TM) stipulates that a TSP concentration of 500 mgm^-3 measured at 298K (25°C) and 101.325 kPa (one atmosphere) should not be exceeded for construction dust impacts. Mitigation measures for construction activities are specified in the Air Pollution Control (Construction Dust) Regulation and should be followed.

3.3 Baseline Environmental Conditions and Sensitive Receivers

3.3.1 Baseline Environmental Conditions

The Kam Tin and Nam Sang Wai areas are located within a new development area. The existing air quality within the Study Area is dominated by vehicle emissions from the Kam Tin Road, Kam Sheung Road, Route 3, Fan Kam Road, Route Twisk and cross boundary fluxes of pollutants.

There is currently no EPD air quality monitoring station (AQMS) in operation in the Kam Tin and Nam Sang Wai areas. The nearest station that is most representative is located in Yuen Long. The annual average background TSP concentration monitored at Yuen Long AQMS in 1999 was 102 mgm^-3, which exceeds the HKAQO.

3.3.2 Air Sensitive Receivers

Representative Air Sensitive Receivers (ASRs) were identified in accordance with the requirement in the EIAO-TM, through site inspections and reviews of landuse plans. All the identified ASRs for Designated Elements and Potentially Designated Elements are summarised in Tables 3.3a and 3.3b, respectively and are shown in Figures 3.3 a to 3.3 f.

Table 3.3a Locations of Air Sensitive Receivers for Designated Elements

ASRs		Location	Approximate Distance from Nearest Worksite Boundary (m)
S4	Sewers/Rising Mains between Kam Tin Sewage Pumping Station (KTPS) and Nam Sang Wai Sewage Pumping Station (NSWPS)
D1		Scattered House near Kam Tin Shi	80
D3		Yuk Yat Garden Phase III	40
D4		Yuk Yat Garden Phase II	20
D5		Ko Po Tsuen	80
D6		San Tao Home for the Aged	130
D8		Ha Ko Po Tsuen	140
D10		Fishery Research Station	320
D11		Scattered House in Nam Sang Wai	50
D12		Scattered House in Nam Sang Wai	5
S6	Sewers/Rising Mains from Nam Sang Wai Pumping Station (NSWPS) to Yuen Long STW
D13		Scattered House in Nam Sang Wai	140
D14		Planned Residential Development (DPA/YL-NSW/12)	380
D15		Nam Sang Wai	60
D16		Planned Recreational Development (DPA/YL-NSW/12)	60
D42		Tin Fook Wai Residential Development	30

Table 3.3b Locations of Air Sensitive Receivers for Potentially Designated Elements

ASRs		Location	Approximate Distance from Nearest Worksite Boundary (m)
S1	Sewers/Rising Mains Along Kam Tin Main Drainage Channel (MDC) From Shui Tsan Tin Sewage Pumping Station (STTPS) to Ng Ka Tsuen Sewage Pumping Station (NKTPS)
D32		Ng Ka Tsuen Historical Building	85
D33		Ng Ka Tsuen	5
D38		Kam Tsin Wai	30
D39		Kam Kong Villa	5
S2	Sewers/Rising Mains Along Kam Tin Main Drainage Channel From Pang Ka Tsuen Pumping Station (PKTPS) to Kam Tin Pumping Station (KTPS)
D1		Scattered House Near Kam Tin Shi	25
D3		Yuk Yat Garden Phase III	95
D22		Kam Tin Shi North	40
D23		Kam Hing Wai	50
D24		Tai Hong Wai North	75
D25		Kam Tin Tung Tak Public School	125
D26		Scattered House Opposite To Proposed P6	40
S5	Branch Sewers/Rising Mains From Sha Po Pumping Station (SPPS) to S4
D19		Fung Kat Heung	60
D21		Mo Fan Heung	90
P1	Kam Tin Sewage Pumping Station (KTPS)
D1		Scattered House Near Kam Tin Shi	160
D3		Yut Yat Garden Phase III	85
D17		Scattered House Near Route 3	15
P2	Sha Po Sewage Pumping Station (SPPS)
D19		Fung Kat Heung	20
D21		Mo Fan Heung	200
P3	Nam Sang Wai Sewage Pumping Station (NSWPS)
D13		Scattered House I Nam Sang Wai	150
P4	Shui Tsan Tin Sewage Pumping Station (STTPS)
D41		Shui Tsan Tin Tsuen	100
P5	Ng Ka Tsuen Sewage Pumping Station (NKTPS)
D30		Scattered House Beside Kam Sheung Life Lutheran Church	30
D31		Kam Sheung Life Lutheran Church	35
D32		Ng Ka Tsuen Historical Building	5
P6	Pang Ka Tsuen Sewage Pumping Station (PKTPS)
D25		Kam Tin Tung Tak Public School	210
D26		Scattered House Opposite To Proposed P6	70
D27		Hip Tin Kung	55
P7	Leung Uk Tsuen Sewage Pumping Station (LUTPS)
D28		Scattered House Opposite To Leung Uk Tsuen	65
D29		Leung Uk Tsuen	60

3.4 Potential Impacts

3.4.1 Construction Phase

Major activities associated with the construction of the sewers/rising mains and SPSs include:

· excavation and backfilling of soil for site formation and trenching;

· stockpiling of excavated materials;

· foundation works for the SPSs; and

· civil construction and E&M installation of the SPSs.

Potential dust generating activities could arise from the following operations:

· materials handling;

· wind erosion of stockpiles; and

· truck movements on any unpaved roads.

As the sewers/rising mains will be constructed section by section, the volumes of excavated spoil are expected to be low. The number of vehicle trips during construction is expected to be very small and for most areas, vehicle movements will be on paved roadways. Only minimal movement of vehicles on unpaved roads will be required.

ASRs located very close to the worksite boundary, including a scattered house near Kam Tin Shi (D1), Yuk Yat Garden Phase II (D4), scattered house in Nam Sang Wai (D12), scattered house near Route 3 (D17), scattered house opposite to proposed SPS P6 (D26), Ng Ka Tsuen Historical Building (D32), Ng Ka Tsuen (D33) and Kam Kong Villa (D39) may experience dust impacts. However, it is expected that the dust impacts can be controlled by implementation of the mitigation measures recommended in Section 3.5 and through the Environmental Monitoring & Audit (EM&A) programme.

Cumulative Impacts

Several projects will be undergoing construction in parallel with this Project. Details of the other concurrent projects have been presented in Section 2. As the construction of the concurrent projects may be carried out simultaneously with this Project and given the close proximity of the worksites to the identified ASRs, cumulative dust impacts have the potential to arise. However, it is the sewers/rising mains will be constructed in 50 m segments. Given the very small scale of the construction works, the contribution to dust impacts is very limited. In addition, construction works are governed by the Air Pollution Control (Construction Dust) Regulation, and hence the air quality impact should be maintained within the statutory dust criterion.Thus, with the limited contribution of dust from the Project, cumulative dust impacts would be expected to be within statutory dust criteria.

3.4.2 Operational Phase

There will be no pollutant sources during the operation of the sewers/rising mains as sewage is to be transferred within and enclosed system.As some of the sewage pumping stations (SPSs) are located very close to sensitive uses, odour impacts would potentially occur during the operation. Wet wells and screenings collection areas are the likely sources of odour at SPSs; however, the of SPSs does not usually cause adverse odour nuisance to nearby ASRs. The design of the proposed SPSs will be similar to existing SPSs, ie the wet wells and screenings collection areas will be enclosed with the provision for odour removal systems, such as activated carbon filters. Adverse odour nuisance is not envisaged. As a precautionary measure, it is recommended that the discharge point of the odour removal system should be directed away from the adjacent sensitive uses. Moreover, an effective and regular maintenance programme should be put in place to maintain an odour removal efficiency of at least 90%.

3.5 Mitigation Measures

3.5.1 Construction Dust

With the adoption of the following mitigation measures stipulated in the Air Pollution Control (Construction Dust) Regulation, the potential dust impact can be minimised to comply with the dust criterion:

· where a site boundary adjoins a road, street, service lane or other area accessible to the public, a hoarding of not less than 2.4 m high from ground level should be provided along the boundaries of the seven pumping stations sites;

· the portion of any road leading only to a construction site that is within 30 m of a discernible or designated vehicle entrance or exit should be kept clear of dusty materials;

· any stockpile of dusty materials should be either covered entirely by impervious sheeting, placed in an area sheltered on the top and the 3 sides or sprayed with water so as to maintain the entire surface wet;

· all dusty materials should be sprayed with water immediately prior to any loading and unloading so as to maintain the dusty materials wet;

· every vehicle should be washed to remove any dusty materials from its body and wheels immediately before leaving a construction site;

· where a vehicle leaving a construction site is carrying a load of dusty materials, the load should be covered entirely by clean impervious sheeting to ensure that the dusty materials do not leak from the vehicle;

· water should be continuously sprayed on the surface where any mechanical breaking operation that causes dust emission is carried out, unless the process is accompanied by the operation of an effective dust extraction and filtering device;

· the working area of excavation should be sprayed with water immediately before, during and immediately after the operation so as to maintain the entire surface wet;

· where a scaffolding is erected around the perimeter of a building under construction, effective dust screens, sheeting or netting should be provided to enclose the scaffolding from the ground floor level of the SPS; and

· any skip hoist for material transport should be totally enclosed by the impervious sheeting.

3.5.2 Operational Phase

The following odour control measures should be implemented during the operation of the sewage pumping stations:

· the main odour sources such as the wet well and screening house should be enclosed;

· odour removal systems, such as activated carbon filters, should be installed to reduce the odour emissions;

· proper design of the discharge point of the odour removal system should be adopted to direct the emission away from the adjacent sensitive uses;

· the transportation of screenings during maintenance should be arranged so as to prevent odour impacts; and

· effective and regular maintenance of the odour removal system should be performed to maintain the removal efficiency at least 90%.

3.6 Residual Impact

After the implementation of the recommended mitigation measures described in Section 3.5, there will be no adverse residual impacts associated with the construction and operation of the sewers/rising mains and sewage pumping stations.

3.7 Environmental Monitoring & Audit

Monitoring and auditing of air quality has been recommended for the construction phase. Environmental monitoring stations should be set up to monitor the dust level during the construction of the Project. The recommended dust monitoring locations are summarized in Table 3.7a and shown in Figures 3.7a to e.

Table 3.7a Recommended Dust Monitoring Stations

Dust Monitoring Station		Location
Designated Element
S4	Sewers/Rising Mains between Kam Tin Sewage Pumping Station (KTPS) and Nam Sang Wai Sewage Pumping Station (NSWPS)
AM1	Worksite Boundary facing Scattered House in Nam Sang Wai
S6	Sewers/Rising mains from Nam Sang Wai Pumping Station (NSWPS) to Yuen Long STW
AM2	Worksite Boundary in Nam Sang Wai
Potentially Designated Element
S1	Sewers/Rising Mains along Kam Tin Main Drainage Channel (MDC) from Shui Tsan Tin Sewage Pumping Station (STTPS) to Ng Ka Tsuen Sewage Pumping Station (NKTPS)
AM3	Worksite Boundary facing Kam Kong Villa
S2	Sewers/Rising Mains along Kam Tin Main Drainage Channel from Pang Ka Tsuen Pumping Station (PKTPS) to Kam Tin Pumping Station (KTPS)
AM4	Worksite Boundary facing Scattered House opposite to Proposed P6
S5	Branch Sewers/Rising Mains from Sha Po Pumping Station (SPPS) to S4
AM5	Worksite Boundary facing Fung Kat Heung
P1	Kam tin Sewage Pumping Station (KTPS)
AM6	Worksite Boundary facing Scattered House near Route 3
P2	Sha Po Sewage Pumping Station (SPPS)
AM5	Worksite Boundary facing Fung Kat Heung
P3	Nam Sang Wai Sewage Pumping Station (NSWPS)
AM7	Worksite Boundary facing Scattered House in Nam Sang Wai
P4	Shui Tsan Tin Sewage Pumping Station (STTPS)
AM8	Worksite Boundary facing Shui Tsan Tin Tsuen
P5	Ng Ka Tsuen Sewage Pumping Station (NKTPS)
AM9	Worksite Boundary facing Scattered House beside Kam Sheung Life Lutheran Church
P6	Pang Ka Tsuen Sewage Pumping Station (PKTPS)
AM10	Worksite Boundary facing Hip Tin Kung
P7	Leung Uk Tsuen Sewage Pumping Station (LUTPS)
AM11	Worksite Boundary facing Leung Uk Tsuen

3.7.1 Baseline Monitoring

Baseline monitoring should be carried out 1 month before the commencement of the construction works. The monitoring should be conducted at the designated monitoring locations for at least 14 consecutive days to ascertain the existing 24-hr Total Suspended Particulate (TSP) concentrations. 1-hr sampling is also recommended to be undertaken at least 3 times per day at each monitoring location.

The baseline monitoring results form the basis for determining the air quality criteria for the impact monitoring. Table 3.7b shows the air quality criteria, namely Action and Limit Levels for construction dust. Should monitored TSP levels exceed the Action Level during construction, appropriate control measures will need to be employed to restore the dust level to an acceptable level.

Table 3.7b Action and Limit Levels for Air Quality (Construction Dust)

Parameters	Action	Limit (mgm^-3)
24 Hour TSP Level in mgm^-3	For baseline level £ 200 mgm^-3, Action level = (Baseline level * 1.3 + Limit level)/2; For baseline level > 200 mgm^-3, Action level = Limit level	260
1 Hour TSP Level in mgm^-3	For baseline level £ 384 mgm^-3, Action level = (Baseline level * 1.3 + Limit level)/2; For baseline level > 384 mgm^-3, Action level = Limit level	500

3.7.2 Impact Monitoring

24-hour TSP concentrations should be measured utilising the techniques specified in High Volume Method for Total Suspended Particulates, Part 50 Chapter 1 Appendix B, Title 40 of the Code of Federal Regulations of the USEPA. It is considered that this form of impact monitoring should be undertaken at the proposed monitoring locations once every 6 days.

Due to the lengthy delay between the sampling event and availability of the results for 24-hour sampling, 1-hour TSP sampling should also be conducted in response to any complaints about construction dust. 1-hour TSP levels, while assessed against different criteria, are considered to be indicative of the 24-hour results conducted on the same day. In this way expedient remedial actions, should they be required, may be undertaken based on the 1-hour data, before the 24-hour results become available.

1-hour sampling, providing real time airborne particulate measurements, can be undertaken using a direct reading dust meter. Despite the advantages of using a real time monitor to measure particulate concentrations such as in response to dust complaints, results are not comparable with 24-hour High Volume Sampler (HVS) data. Therefore, if the use of a direct reading monitor is agreed for 1-hour TSP sampling, both baseline and impact monitoring must be carried out by the direct reading method.

Specific dust control measures and monitoring during the construction phase should be included as part of the works contracts. Regular compliance checking by the Environmental Checker and the Engineer at the site and at the Air Sensitive Receivers should be conducted.

3.8 Conclusion

Potential impacts arising from the construction and operation of the sewers/rising mains and sewage pumping stations are construction dust and odour, respectively. With the implementation of the mitigation measures recommended in Section 3.5 and an effective monitoring and auditing programme, the potential construction dust and odour impacts will be minimised and kept within the relevant criteria. In addition, cumulative dust impacts are also expected to be within the criteria.

3.9 Impact Summary

The air quality impacts during the construction and operational phases are summarized in Table 3.9a.

Table 3.9a Impact Summary for Construction Dust

Parameters	Construction Dust
Assessment Criteria	· Hourly dust criterion recommended in EIAO-TM is 500 mgm^-3 and daily dust criterion stipulated in the Hong Kong Air Quality Objective (AQOs) is 260 mgm^-3.
Air Sensitive Receivers	Designated Elements
	S4	Sewers/Rising mains Between Kam Tin Sewage Pumping Station (KTPS) And Nam Sang Wai Sewage Pumping Station (NSWPS)
	D1	Scattered House Near Kam Tin Shi
	D3	Yuk Yat Garden Phase III
	D4	Yuk Yat Garden Phase II
	D5	Ko Po Tsuen
	D6	San Tao Home for the Aged
	D8	Ha Ko Po Tsuen
	D10	Fishery Research Station
	D11	Scattered House in Nam Sang Wai
	D12	Scattered House in Nam Sang Wai
	S6	Sewers/Rising Mains from Nam Sang Wai Pumping Station to Yuen Long STW
	D13	Scattered House in Nam Sang Wai
	D14	Planned Residential Development (DPA/YLMNSW/12)
	D15	Nam Sang Wai
	D16	Planned Recreational Development (DPA/YL-NSW/12)
	D42	Tin Fook Wai Residential Development
	Potentially Designated Elements
	S1	Sewers/Rising Mains along Kam Tin Main Drainage Channel (MDC) from Shui Tsan Tin Sewage Pumping Station (STTPS) to Ng Ka Tsuen Sewage Pumping Station (NKTPS)
	D32	Ng Ka Tsuen Historical Building
	D33	Ng Ka Tsuen
	D38	Kam Tsin Wai
	D39	Kam Kong Villa
	S2	Sewers/Rising Mains along Kam Tin Main Drainage Channel from Pang Ka Tsuen Pumping Station (PKTPS) to Kam Tin Pumping Station (KTPS)
	D1	Scattered House near Kam Tin Shi
	D3	Yuk Yat Garden Phase III
	D22	Kam Tin Shi North
	D23	Kam Hing Wai
	D24	Tai Hong Wai North
	D25	Scattered House near Kam Tin San Tsuen
	D26	Scattered House opposite to Proposed P6
	S5	Brach Sewers/Rising Mains from Sha Po Pumping Station (SPPS) to S4
	D19	Fung Kat Heung
	D21	Mo Fan Heung
	P1	Kam Tin Sewage Pumping Station (KTPS)
	D1	Scattered House near Kam Tin Shi
	D3	Yut Yat Garden Phase III
	D17	Scattered House near Route 3
	P2	Sha Po Sewage Pumping Station (SPPS)
	D19	Fung Kat Heung
	D21	Mo Fan Heung
	P3	Nam Sang Wai Sewage Pumping Station (NSWPS)
	D13	Scattered House in Nam Sang Wai
	P4	Shui Tsan Tin Sewage Pumping Station (STTPS)
	D41	Shui Tsan Tin Tsuen
	P5	Ng Ka Tsuen Sewage Pumping Station (NKTPS)
	D30	Scattered House beside Kam Sheung Life Lutheran Church
	D31	Kam Sheung Life Lutheran Church
	D32	Ng Ka Tsuen Historical Building
	P6	Pang Ka Tsen Sewage Pumping Station (PKTPS)
	D25	Scattered House near Kam Tin San Tsuen
	D26	Scattered House opposite to Proposed P6
	D27	Hip Tin Kung
	P7	Leung Uk Tsuen Sewage Pumping Station (LUTPS)
	D28	Scattered House opposite to Leung Uk Tsuen
	D29	Leung Uk Tsuen
Activities	Construction Phase
	· Dust level of 102 mgm^-3 monitored at Yuen Long Air Quality Monitoring Station operated by EPD in 1999 was considered as a background dust level in the vicinity. · Dust nuisance from construction works are the major impact. · Major construction activities include excavation, backfilling, site formation, foundation works, stockpiling, concreting, trucks on unpaved road and construction of SPSs. · Materials handling, wind erosion of stockpiles, truck movement on the unpaved roads are the major dust generating activities among of the above mentioned construction activities. · Those ASRs located very close to the worksite boundary including scattered house near Kam Tin Shi (D1), Yuk Yat Garden Phase II (D4), scattered house in Nam Sang Wai (D12), scattered house near Route 3 (D17), scattered house opposite to proposed SPS P6 (D26), Ng Ka Tsuen Historic Building (D32), Ng Ka Tsuen (D33) and Kam Kong Villa (D39) have the potential to experience dust impacts. However, it is expected that the dust impacts can be controlled by implementation of the mitigation measures recommended in Section 3.5 and through the Environmental Monitoring & Audit (EM&A) programme. · Cumulative impacts are expected to be minimal as the scale of our construction work is small and the contribution of the dust impact from this project is limited.
	Operational Phase
	· Odour impacts from the operation of the sewers/rising mains are not expected; · As some of the proposed sewage pumping stations are located very close to the adjacent ASRs, odour impacts may occur
Mitigation Measures	Construction Dust
	Control measures stipulated in Air Pollution (Construction Dust) Regulation as follows:
	· where a site boundary adjoins a road, street, service lane or other area accessible to the public, hoarding of not less than 2.4 m high from ground level should be provided along the boundaries of the seven pumping stations sites and the works area where the Engineer’s site office and the Contractor’s site office erected; · the portion of any road leading only to a construction site that is within 30 m of a discernible or designated vehicle entrance or exit should be kept clear of dusty materials; · any stockpile of dusty materials should be either covered entirely by impervious sheeting, placed in an area sheltered on the top and the 3 sides or sprayed with water so as to maintain the entire surface wet; · all dusty materials should be sprayed with water immediately prior to any loading and unloading so as to maintain the dusty materials wet; · every vehicle should be washed to remove any dusty materials from its body and wheels immediately before leaving a construction site; · where a vehicle leaving a construction site is carrying a load of dusty materials, the load should be covered entirely by clean impervious sheeting to ensure that the dusty materials do not leak from the vehicle; · water should be continuously sprayed on the surface where any mechanical breaking operation that causes dust emission is carried out, unless the process is accompanied by the operation of an effective dusty extraction and filtering device; · the working area of excavation should be sprayed with water immediately before, during and immediately after the operation so as to maintain the entire surface wet; · where a scaffolding is erected around the perimeter of a building under construction, effective dust screens, sheeting or netting should be provided to enclose the scaffolding from the gound floor level of the SPS, or if a canopy is provided a the first floor level, from the first floor level, up to the highest level of the scaffolding; and · any skip hoist for material transport should be totally enclosed by the impervious sheeting.
	Operational Phase
	· the main odour sources such as wet well and screening house should be enclosed; · an odour removal system, such as activated carbon filters should be installed to reduce the odour emissions; · proper design of the discharge point of the odour removal system should be adopted to direct emissions away from the adjacent sensitive uses; and · effective and regular maintenance of the odour removal system should be performed to maintain the removal efficiency at about 90%.
Residual Impacts	No adverse residual impacts identified during both construction and operational phases after the implementation of the mitigation measures.
Implementation	· All the dust control measures should be implemented by the Contractor. · The odour control measures should be implemented by the DSD.
EM&A Requirement	EM&A is required. Air monitoring stations include:
	Designated Elements
	S4	Sewers/Rising Mains between Kam Tin Sewage Pumping Station (KTPS) and Nam Sang Wai Sewage Pumping Station (NSWPS)
	AM1	Worksite Boundary facing Scattered House in Nam Sang Wai
	S6	Sewers/Rising mains from Nam Sang Wai Pumping Station (NSWPS) to Yuen Long STW
	AM2	Workstie Boundary in Nam Sang Wai
	Potentially Designated Elements
	S1	Sewers/Rising Mains along Kam Tin Main Drainage Channel (MDC) from Shui Tsan Tin Sewage Pumping Station (STTPS) to Ng Ka Tsuen Sewage Pumping Station (NKTPS)
	AM3	Worksite Boundary facing Kam Kong Villa
	S2	Sewers/Rising Mains along Kam Tin Main Drainage Channel from Pang Ka Tsuen Pumping Station (PKTPS) to Kam Tin Pumping Station (KTPS)
	AM4	Worksite Boundary facing Scattered House opposite to Proposed P6
	S5	Branch Sewers/Rising Mains from Sha Po Pumping Station (SPPS) to S4
	AM5	Worskite Boundary facing Fung Kat Heung
	P1	Kam tin Sewage Pumping Station (KTPS)
	AM6	Worksite Boundary facing Scattered House near Route 3
	P2	Sha Po Sewage Pumping Station (SPPS)
	AM5	Worksite Boundary facing Fung Kat Heung
	P3	Nam Sang Wai Sewage Pumping Station (NSWPS)
	AM7	Worksite Boundary facing Scattered House in Nam Sang Wai
	P4	Shui Tsan tin Sewage Pumping Station (STTPS)
	AM8	Worksite Boundary facing Shui Tsan Tin Tsuen
	P5	Ng Ka Tsuen Sewage Pumping Station (NKTPS)
	AM9	Worksite Boundary facing Scattered House beside Kam Sheung Life Lutheran Church
	P6	Pang Ka Tsuen Sewage Pumping Station (PKTPS)
	AM10	Worksite Boundary facing Hip Tin Kung
	P7	Leung Uk Tsuen Sewage Pumping Station (LUTPS)
	AM11	Worksite Boundary facing Leung Uk Tsuen

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