TABLE OF CONTENTS

7.       land contamination.. 7-1

7.1       Introduction. 7-1

7.2       Environmental Legislation, Standards and Criteria. 7-1

7.3       Assessment Methodology. 7-1

7.4       Description of Environment 7-2

7.5       Identification of Potential Land Contamination Concern. 7-5

7.6       Future Land Uses. 7-30

7.7       Site Investigation Plan. 7-30

7.8       Initial Evaluation of Potential Land Contamination Impact 7-34

7.9       Mitigation of Adverse Environmental Impacts. 7-34

7.10    Evaluation of Residual Impact 7-35

7.11    Environmental Monitoring and Audit 7-36

7.12    Conclusion. 7-36

 

List of Tables

Table 7.1          Past and Existing Facilities / Works Areas within the Proposed Clearance Limit and their Potential Land Contamination Issues to the Project

Table 7.2          Past and Existing Off-Site Facilities / Works Areas and their Potential Land Contamination Issues to the Project

Table 7.3          Aerial Photographs Reviewed

Table 7.4          Summary of Relevant Chemical Waste Producer Records

Table 7.5          Summary of Issued Dangerous Goods Licenses within the Project Area Provided by FSD

Table 7.6          Summary of Incidents Provided by FSD

Table 7.7          Summary of Concerned Sites within Proposed Clearance Limit

Table 7.8          Summary of Concerned Off-site Facilities / Works Areas

Table 7.9          Proposed Sampling and Testing Plan

Table 7.10       Preliminary Sampling and Testing Plan

 

List of Figures

Figure 7.1              Locations of Potentially Contaminated Sites / Concerned Sites

Figure 7.2              Proposed Sampling Locations (Site STW1)

 

List of Appendices

Appendix 7.1         Initial Site Appraisal (ISA)

 

7.                   land contamination

7.1               Introduction

7.1.1.1      This section presents the potential implications of land contamination associated with the Project.

7.2               Environmental Legislation, Standards and Criteria

7.2.1.1      The relevant environmental guidelines and standards on land contamination aspect include the following:

·       Section 3.1 and 3.2 (Potential Contaminated Land Issues) of Annex 19 “Guidelines for Assessment of Impact on Sites of Cultural Heritage and Other Impacts” of the Technical Memorandum on Environmental Impact Assessment Process (EIAO-TM) (EPD, effective since 30 June 2023)

·       Guidance Note for Contaminated Land Assessment and Remediation (Guidance Note) (EPD, April 2023)

The Guidance Note sets out the requirements for proper assessment and management of potentially contaminated sites such as oil installations (e.g. oil depots, petrol filling stations), gas works, power plants, shipyards / boatyards, chemical manufacturing / processing plants, steel mills / metal workshops, car repairing / dismantling workshops and scrap yards.  In addition, this Guidance Note provides guidelines on how site assessments should be conducted and analysed and suggests practical remedial measures that can be adopted for the remediation of contaminated sites.

·       Practice Guide for Investigation and Remediation of Contaminated Land (Practice Guide) (EPD, April 2023)

The Practice Guide outlines typical investigation methods and remediation strategies for the range of potential contaminants typically encountered in Hong Kong.

·       Guidance Manual for Use of Risk-based Remediation Goals for Contaminated Land Management (Guidance Manual) (EPD, April 2023)

The Guidance Manual introduces the risk-based approach in land contamination assessment and presents instructions for comparison of soil and groundwater data to the Risk-Based Remediation Goals (RBRGs) for 54 chemicals of concern (COCs) commonly found in Hong Kong.  The RBRGs were derived to suit Hong Kong conditions by following the international practice of adopting a risk-based methodology for contaminated land assessment and remediation and were designed to protect the health of people who could potentially be exposed to land impacted by chemicals under four broad post restoration land use categories.  The RBRGs also serve as the remediation targets if remediation is necessary.

7.3               Assessment Methodology

7.3.1.1      Land contamination assessment was carried out according to the abovementioned EIAO-TM, Guidance Note, Practice Guide and Guidance Manual as well as the requirements given in Section 3.4.8 and Appendix F of the EIA Study Brief (No. ESB-359/2023).

7.3.1.2      Site appraisal, including desktop review and site walkover, was conducted to identify the potentially contaminating activities that may pose adverse impact to the Project. For the desktop review, the following information was reviewed:

·       Aerial photographs and topographic maps held by the Lands Department (LandsD);

·       Hong Kong Geological Survey (HKGS) Map (Series HGM20);

·       Available records on dangerous goods (DG), chemical waste producers (CWP), chemical spillage/leakage and incidents within the Project Area from Environmental Protection Department (EPD) and Fire Services Department (FSD); and

·       Relevant ground investigation (GI) reports from the Civil Engineering and Development Department (CEDD) Civil Engineering Library.

7.3.1.3      Site walkover was conducted within the Project Area to review the general site conditions and to identify any sources of land contamination (or ‘hotspots’).

7.3.1.4      Based on the site appraisal, soil and groundwater sampling and testing targeting three (3) potentially contaminated sites have been proposed.  An Initial Site Appraisal (ISA), with detailed findings of the site appraisal and the proposed site investigation (SI) works, was enclosed in Appendix 7.1.

7.3.1.5      As reported in the ISA, the proposed SI works were considered not feasible to be carried out under the EIA Study for the potentially contaminated sites.  Further site appraisal was proposed to be carried out at a later stage of the Project in order to confirm / update the land uses / activities and to identify the presence of potential contamination sources.  The submission of Contamination Assessment Plan(s) (CAP(s)) and the carrying out of associated SI works and any necessary remediation were proposed prior to the commencement of construction works.  An initial contamination evaluation, the possible remediation methods, a confirmation of whether the contamination problem would be surmountable, a SI proposal as well as the tentative schedule for subsequent submissions for the potentially contaminated sites were presented in the ISA.

7.4               Description of Environment

7.4.1.1      The Project would cover areas in northeast Lantau, south of Ma Wan and west Tsing Yi.  The main alignment of the Project would connect northeast Lantau and west Tsing Yi via bridges crossing Kap Shui Mun and Ma Wan Channel.  As shown in the site location plan provided in Figure 2.1.1 to 2.1.4, the Project Area is mainly bounded by Ma Wan and Lantau Link to the north; and open water to the south.

7.4.1.2      Based on the latest land requirement plan, the alignment and associated works areas for the Project (hereinafter referred to as “Proposed Clearance Limit”) are shown in Figures 2.0 to 2.11 of Appendix 7.1. The construction methods are graphically indicated in Figures 2.8.1 to 2.8.13. Soil excavation works are anticipated along the elevated carriageway and  tunnels of the Tsing Yi – Lantau Link alignment. For the remaining Project Area that are outside the Proposed Clearance Limit, no construction works (including soil excavation and aboveground works) would be carried out.

7.4.1.3      In addition to the above, the Proposed Clearance Limit across Kap Shui Mun and Ma Wan Channel would be constructed across the sea and no land contamination issues are anticipated within these marine-based areas.

7.4.1.4      Several past and existing facilities / works areas were identified within the Proposed Clearance Limit as shown in Table 7.1. As indicated in Table 7.1, some of the facilities will be retained under the Project. No land contamination issues to the Project associated with these facilities are anticipated.  For the affected facilities / works areas within the Proposed Clearance Limit, further review was carried out to identify any potential land contamination issues to the Project. Locations of the facilities / work area are shown in Figure 7.1.

7.4.1.5      In addition to the above, past and existing facilities / works areas that are outside the Proposed Clearance Limit but within the Project Area (i.e. off-site facilities / works areas) are shown in Table 7.2.  Locations of these off-site facilities / works areas are also shown in Figure 7.1.  As shown in Table 7.2, for facilities / works areas that are close to the Proposed Clearance Limit, further review was carried out to identify any potential land contamination issues to the Project. Furthermore, the Shell Tsing Yi Installation (Site STW3), which is located outside the Project Area, was also reviewed given its land use (an oil installation) and its proximity to the Proposed Clearance Limit. Site STW3 is shown in Table 7.2 and Figure 7.1. 

 

Table 7.1      Past and Existing Facilities / Works Areas within the Proposed Clearance Limit and their Potential Land Contamination Issues to the Project

Site ID1	Site Name	Partially / Fully Encroached to the Proposed Clearance Limit	Proposed Works under the Project	Any Potential Issues to the Project?
TYTL 108RP & TYTL 80, West Tsing Yi
HUD1	Dockyard (TYTL 108RP)	Partially encroached	Facilities within the Proposed Clearance Limit to be demolished; viaduct/bridge erection	To be reviewed in Table 7.7
HUD2	Sai Tso Wan Concrete Batching Plant (TYTL 108RP)	Partially encroached (only the existing access road within the Proposed Clearance Limit)	Provision of access road (main portion of the site (including the concrete batching plant) to be retained)	To be reviewed in Table 7.7
HUD4	Former Floating Dock (TYTL 80)	Fully encroached (floating on sea)	Reclamation works	No2
West Tsing Yi / Sai Tso Wan
STW1	Public Carpark (STT3878K&T) and Adjacent Vegetated Land	Partially encroached	Construction of haul road for road modification/realignment work, site office and site storage area	To be reviewed in Table 7.7
STW2	Truck Marshalling Area (STT3194K&T)	Partially encroached	Construction of Tsing Yi Connection viaduct and possible site office	To be reviewed in Table 7.7
WTY1	DSD Rock Storage Area (GLA-TKT 1939)	Fully encroached	Construction of Tsing Yi Connection viaduct, site office and site storage area	To be reviewed in Table 7.7
WTY2	Former LandsD Works Area (Formerly as GLA-TKT 1926)	Fully encroached	Site storage area	To be reviewed in Table 7.7
WTY4	Lantau Link Viewing Platform Car Park	Fully encroached	Site storage area	To be reviewed in Table 7.7
Northeast Lantau
LT1	CEDD Slope Works Site	Partially encroached	Construction of North Lantau Interchange	To be reviewed in Table 7.7
LT2	Vacant Land (GLA-TIS 801 & GLA-TIS 854)	Partially encroached	Works storage area	To be reviewed in Table 7.7
LT3	Lantau Toll Plaza Administration Building	Partially encroached (only part of the existing access road within the Proposed Clearance Limit)	Facilities to be retained; the encroached part of the existing access road will be used for viaduct works in tandem with Route 11	To be reviewed in Table 7.7
LT4	Radar Station	Partially encroached	To be retained; deep underground tunnelling works only within bedrock (at depth of approximately 110m bgl). No soil excavation and aboveground works.	No

Remark:

*      Sites shaded grey were further reviewed under the ISA in Appendix 7.1.

¹          Refer to Figure 7.1 for site locations and the extents of sites.

²          Potential land contamination issues associated with the former floating dock to the Project is not anticipated as the dock was a marine vessel floating on open water.

 

Table 7.2      Past and Existing Off-Site Facilities / Works Areas and their Potential Land Contamination Issues to the Project

Site ID1	Site Name	Facility within Project Area?	Distance from Proposed Clearance Limit (m)	Proposed Works under the Project	Any Potential Issues to the Project?
TYTL 108RP & TYTL 80, West Tsing Yi
HUD3	Sai Tso Wan 2 Concrete Batching Plant (TYTL 108RP)	Yes	10 m	To be retained	Site close to the Proposed Clearance Limit. Potential issues to be reviewed in Table 7.8.
West Tsing Yi / Sai Tso Wan
STW3	Shell Tsing Yi Installation (TYTL 108 S.A)	No	10 m	To be retained	Site close to the Proposed Clearance Limit. Potential issues to be reviewed in Table 7.8.
WTY3	MTR – Tsing Yi Ventilation Building	Yes	155 m	To be retained	No potential issues given the distance from the Proposed Clearance Limit.
TM1	Tsing Ma Control Area (TMCA) - Tsing Yi Administration Building	Yes	35 m	To be retained	No potential issues given the distance from the Proposed Clearance Limit.
TM2	TMCA - Workshop	Yes	< 1 m	To be retained	Site close to the Proposed Clearance Limit. Potential issues to be reviewed in Table 7.8.
TM3	TMCA - Tsing Yi Interchange Depot	Yes	< 1 m	To be retained	Site close to the Proposed Clearance Limit. Potential issues to be reviewed in Table 7.8.
TM4	TMCA - Tsing Yi Interchange Electrical Substation	Yes	12 m	To be retained	No potential issues given the distance from the Proposed Clearance Limit.
Northeast Lantau
LT5	MTRL - East Lantau Traction Substation & East Lantau Tunnel (East) Ventilation Building	Yes	3 m	To be retained	Site close to the Proposed Clearance Limit. Potential issues to be reviewed in Table 7.8.

Remark:

*      Sites shaded grey were further reviewed under the ISA in Appendix 7.1.

¹          Refer to Figure 7.1 for site locations and the extents of sites.

 

7.5               Identification of Potential Land Contamination Concern

7.5.1           General

7.5.1.1      Site appraisal was carried out in the period from May 2023 to January 2025 with site walkovers conducted in October and November 2023, and January 2025. Findings of the site appraisal are summarised below.

7.5.2           Review of Historical Land Uses

7.5.2.1      A review of aerial photographs was undertaken to evaluate the likelihood of potential contamination associated with past land uses within the Proposed Clearance Limit and the Project Area.  Findings of the review are summarised in Table 7.3 and the reviewed aerial photographs are provided in Appendix A of Appendix 7.1.

Table 7.3      Aerial Photographs Reviewed

Year	Site Description
1963	The Project Area is mainly occupied by natural terrain and open water, village houses and agricultural land.
1973	Vacant land was observed at Kam Chuk Kok, west Tsing Yi. No other significant land uses changes were observed.
1983	Container storage (Sites HUD1, HUD2 and HUD3) and electrical substation (Site HUD1) on newly reclaimed land were observed at Shek Wan, west Tsing Yi. Excavation was observed at Wok Tai Wan, west Tsing Yi. A dockyard on newly reclaimed land was observed south and outside of the Project Area (Site STW3). No other significant land uses changes were observed.
1993	Construction works of the existing North Lantau Highway, existing Lantau Link and existing Tsing Ma Bridge were observed at Lantau and Tsing Yi, and on newly reclaimed land at Tai Chuen and Ma Wan. Existing radar station (Site LT4) (to be retained under the Project) was observed at Lantau. New reclamation was observed at Sites HUD1, HUD2 and HUD3. The container storage (Site HUD1 and Site HUD3) and electrical substation (Site HUD1) at Shek Wan were changed to dockyard. Site HUD1 consisted of existing workshops, container storage, existing electrical substation and existing administration building and Site HUD3 consisted of container storage. The container storage at Site HUD2 was changed to open storage. Floating dock (Site HUD4) was observed. Vacant land was observed at Sai Tso Wan (Site STW1). The dockyard at Site STW3 was changed to existing oil installation outside of the Project Area and further reclamation was observed in the western portion of Site STW3.
2003	Existing North Lantau Highway, existing Lantau Link and existing Tsing Ma Bridge were observed. Existing Lantau Toll Plaza Administration Building (Site LT3) and toll gate were observed at Tai Tsing Chau, northeast Lantau. Vacant land (Site LT2) and existing MTRL - East Lantau Traction Substation & East Lantau Tunnel (East) Ventilation Building (Site LT5) were observed at Tai Chuen, northeast Lantau. Existing Tai Pai Tsui Pier and vacant land were observed at Ma Wan. Existing North West Tsing Yi Interchange, vacant land (Site WTY1), existing car park (Site WTY2) and existing Lantau Link Viewing Platform Car Park (Site WTY4) were observed at west Tsing Yi. The existing Tsing Ma Control Area (TMCA) facilities (Site TM1, Site TM2, Site TM3 and Site TM4) and existing MTR - Tsing Yi Ventilation Building (Site WTY3) were observed at west Tsing Yi and Wok Tai Wan. The open storage at Site HUD2 was replaced by existing Sai Tso Wan Concrete Batching Plant and existing electrical substation. Car parks were observed at Site STW1 and Site STW2, west Tsing Yi. Vegetated land was observed at Site STW1 adjacent to the car park. Existing Cheung Tsing Highway was observed.
2013	Car park at Site STW1 was vacated. The adjacent vegetated land remains unchanged. No other significant land uses changes were observed.
2022	Toll gate was no longer observed at Lantau Link / North Lantau Highway. Container storage was replaced by open storage of steel reinforcing bars within the dockyard (Site HUD1). The portion of the dockyard at Site HUD3 was changed to a construction site for the concrete batching plant. A works area was observed at the car park at Wok Tai Wan, west Tsing Yi (Site WTY2). Existing public carpark was observed along the access road at Kam Chuk Kok (Site STW1). No change was observed at the adjacent vegetated land.

Remarks:

Source of aerial photographs: Survey and Mapping Office, Lands Department

*    Site ID of affected facilities / works areas within the Proposed Clearance Limit (refer to Table 7.1) are shown in bold.

**   Site ID of concerned off-site facilities / works areas that were reviewed (refer to Table 7.2) are shown in underline.

 

7.5.2.2      Based on the review of aerial photographs, historical potentially contaminating site within the Proposed Clearance Limit that would be affected by the Project includes Site HUD1 and Site HUD2.  The potentially contaminating land uses within Site HUD1 include former electrical substation (year 1983), former container storage (year 1983 to 2013) and existing dockyard (since year 1993; with electrical substation, workshop and open storage of steel reinforcing bars).  The potentially contaminating land uses within Site HUD2 include former container storage (year 1983), former open storage (year 1993) and existing concrete batching plant (since year 2003; with electrical substation).  Further site walkover was proposed to be carried out within the sites to confirm any land contamination issues.  Locations of Site HUD1 and Site HUD2 are shown in Figure 7.1.

7.5.2.3      Off-site facilities / works areas close to the Proposed Clearance Limit and with historical potentially contaminating land uses include Site HUD3 (former container storage (year 1983)), Site TM2 and Site TM3 (existing TMCA facilities (since year 2003)), Site STW3 (former dockyard (year 1983) and existing oil installation (since year 1993)) and Site LT5 (MTRL - East Lantau Traction Substation & East Lantau Tunnel (East) Ventilation Building (since year 2003)). Further site walkover was carried out to confirm any land contamination issues from the off-site facilities sites / works areas. Locations of Site HUD3, Site TM2, Site TM3, Site STW3 and Site LT5 are shown in Figure 7.1.

7.5.3           Site Geology

7.5.3.1      The following relevant information was examined and reviewed for site geology:

·       The 1:5,000 Hong Kong Geological Survey (HKGS) Map Sheet 10-NE-A (1994), 10-NW-B/C/D (1994/1995), 10-SW-A (1995);

·       The 1:20,000 Hong Kong Geological Survey (HKGS) Map Sheet No.9. (1994);

·       The 1:20,000 Hong Kong Geological Survey (HKGS) Map Sheet No.10. (1991);

·       The 1:100,000 Hong Kong Geological Survey (HKGS) Map of Hong Kong, Web-based Edition (2006); and

·       The Geological Survey Sheet Report No.6, Geology of Tung Chung and Northshore Lantau Island (GEO, 2002)

7.5.3.2      The alignment traverses a structurally complex zone of solid geology where the volcanic tuff and granitic rocks have been disrupted by rhyolite intrusions and subsequent faulting (refer to Appendix B in Appendix 7.1).

7.5.3.3      The solid geology of the Project Area comprises mostly Mesozoic granites and volcanics, which are intruded by the east-west oriented porphyritic rhyolite dye swarm (the East Lantau Dyke Swarm).  The welded-lapilli-bearing coarse ash tuffs of the Yim Tin Tsai Formation (Tsuen Wan Volcanic Group) are the predominant volcanic rock in the area.  The 1:20 000-scale geological map shows these rocks on both Tsing Yi and Lantau, dominating the geology of Ma Wan.  Large swathes of the Ma Wan Fairway are also underlain by the same volcanic formation.

7.5.3.4      These volcanic rocks are also intruded by granite and granodiorite.  The older granodiorite intrusion is mostly limited to the northern portions of Tsing Yi, although the alignment is anticipated to encounter the granodiorite near the existing oil depot at Tsing Yi west.  The granite forms a major plutonic body, occupying a majority of the southern and eastern parts of Tsing Yi and the eastern coast of Lantau Island and a majority of Tang Lung Chau.  Granite is also confirmed in the Ma Wan Fairway to the east of the Lamma Channel Fault.  The granite is predominantly medium grained in Tsing Yi, and appears to be fine grained on Lantau and within the Ma Wan Fairway.

7.5.3.5      In both Lantau and Tsing Yi, east-northeast-trending porphyritic microgranite and feldsparphyric rhyolite dykes are the dominant minor intrusive rocks.  These are occasionally intruded by fine-grained granite and quartzphyric rhyolite dykes and sills.  Several regional and published faults, together with inferred faults from photolineaments and GI are anticipated to traverse the Project Area.  There are also likely to be numerous minor/unnamed faults encountered within the Project Area.

7.5.3.6      Onshore superficial deposits on the hillsides of Lantau and Tsing Yi predominantly comprise debris flow deposits and colluvium.  On Lantau Island, local beach deposits are found along the coastline, and alluvial deposits are noted within valley floors.  In Tsing Yi, similar beach and alluvial deposits may be buried beneath the extensive fill platforms.  The superficial stratigraphy in the offshore area is varied, and it has been altered in places by dredging activities, and heavily eroded due to high current flows through the shipping channels.

7.5.3.7      Based on the available groundwater monitoring records, several standpipes and piezometers were installed along Tsing Yi Anchorage. The average groundwater level within or in the vicinity of Tsing Yi Anchorage varies from approximately 0 m to 34 m below ground level.

7.5.4           Information from Government Departments

7.5.4.1      The EPD and FSD were contacted for (i) records of any spillage / leakage of chemicals, (ii) records of Dangerous Goods (DG), (iii) records of Chemical Waste Producer(s) (CWPs) and (iv) records of reported incidents within the Project Area.

7.5.4.2      EPD’s and FSD’s replies on the request have been received and attached in Appendix C of Appendix 7.1.  The information is summarised below.

Environmental Protection Department

7.5.4.3      According to EPD, there was no record of spillage / leakage of chemical wastes or chemicals within the Project Area.  There were a total of 12 valid and 4 invalid relevant registered CWP records identified within the Project Area and the details are summarised in Table 7.4. Locations of the CWP are shown in Figure 2.12 of Appendix 7.1.

Table 7.4      Summary of Relevant Chemical Waste Producer Records

CWP ID	Site ID	Company Name	Address	Status	Business Nature
TYTL 108RP & TYTL 80, West Tsing Yi
1	HUD1	Hongkong United Dockyards Limited	Sai Tso Wan Road, Tsing Yi, NT	Valid	Repairing of ship
2	HUD1	Van Oord ACZ B.V.	Hongkong United Dockyards Ltd., Sai Tso Wan Road, Tsing Yi, NT	Valid	Dredging industry
3	HUD1	Gilgen Nabtesco (Hong Kong) Ltd	Hongkong United Dockyards Ltd., Tsing Yi, NT	Valid	Contracting
4	HUD1	John Logistic Co. Ltd.	TYTL No. 108, R.P. Hongkong United Dockyards Ltd., Tsing Yi, N.T.	Valid	Vehicle maintenance
5	HUD1	Hollandsche Aanneming Maatschappy B.V.	HUD Building, Sai Tso Wan Rd, Tsing Yi, KL	Invalid	Dredging contractor
6	HUD1	Wartsila China Limited	108RP, Sai Tso Wan Road, Tsing Yi Island	Invalid	Marine diesel Engine repair
7	HUD4	Chau Kee Marine Contractors Company Limited	Floating Dock "Unit" at Anchorage off Premises of Hongkong United Dockyards Ltd. at TYTL 108 RP, Sai Tso Wan Road, Tsing Yi, New Territories	Valid	Tanks cleaning, garbage services
8	HUD2/HUD3	Anderson Concrete Limited	Tsing Yi Town Lot 108RP (part)	Valid	Concrete batching plant
9	HUD2/HUD3	Anderson Concrete Limited	Tsing Yi Town Lot 108RP, Tsing Yi, NT	Valid	Concrete batching plant
10	HUD2/HUD3	Gammon Construction Limited	Concrete Batching Plant at TYTL 108R.P. Terminal, Tsing Yi, NT	Valid	Civil engineering & construction
West Tsing Yi
11	TM1/ TM2/ TM3	TIML MOM Limited	Tsing Ma Control Area, North West Tsing Yi Interchange, Tsing Yi, Territories	Valid	Road management
12	TM1/ TM2/ TM3	Wing Hing Construction Company Limited	Tsing Ma Control Area, North West Tsing Yi Interchange, Tsing Yi	Valid	Road management
13	TM1/ TM2/ TM3	Excellent Dragon Limited	Tsing Ma Control Area, North West Tsing Yi Interchange, Tsing Yi, N.T.	Valid	Road management
14	TM1/ TM2/ TM3	Wader Engineering International Limited	Tsing Ma Control Area, North West Tsing Yi Interchange, Tsing Yi, N.T.	Valid	Road management
15	TM1/ TM2/ TM3	Transport Infrastructure Management Limited	Tsing Ma Control Area, North West Tsing Yi Interchange, Tsing Yi, New Territories	Invalid	Road management
16	LT3	Tsing Ma Management Limited	Garage at Lantau Admin. Bldg. Lantau, NT	Invalid	Road management

 

7.5.4.4      CWP IDs 1 to 10 are associated with various existing/former operations within Site HUD1 to HUD4 (TYTL 108RP / TYTL 80).  Among the 10 records, CWP IDs 1 to 6 are associated with the dockyard operation within Site HUD1.  There could be land contamination issues to the Project associated with these CWPs.  CWP ID 7 is associated with the former floating dock operation at Site HUD4. As discussed in Table 7.2, the former floating dock is a marine vessel floating on open water, no land contamination issues associated with CWP ID 7 is anticipated.  For CWP IDs 8 to 10, which are associated with concrete batching operations, there could be land contamination issues to the Project associated with these CWPs if the chemical / chemical waste storages are within the Proposed Clearance Limit at Site HUD2 / HUD3.

7.5.4.5      CWP IDs 11 to 15 are associated with Tsing Ma Control Area (TMCA). As shown in Table 7.2, all the TMCA facilities (Site TM1 / TM2 / TM3) are off-site facilities and will be retained. Based on the findings of the site walkover (refer to Table 7.8), potential migration of contamination from the TMCA facilities to the Proposed Clearance Limit is not anticipated.  As such, no land contamination impact associated with these records are anticipated.

7.5.4.6      CWP ID 16 is likely to be associated with the operation of the Lantau Toll Plaza Administration Building (Site LT3).  Referring to Table 7.1, the facilities, including the administration building, will be retained under the Project and only part of the existing access road is within the Proposed Clearance Limit.  Based on the findings of the site walkover (refer to PR2 in Appendix D of Appendix 7.1), no chemical waste storages were observed within the encroached portion of this site.  As such, no potential land contamination issue associated with this CWP record to the Project is anticipated.

Fire Services Department

7.5.4.7      Based on the replies from FSD, a total of 11 DG licences have been issued within the Project Area and the details are summarised in Table 7.5 below.  Locations of the DG are shown in Figure 2.12 of Appendix 7.1.

Table 7.5      Summary of Issued Dangerous Goods Licenses within the Project Area Provided by FSD

No.	Type of DG	Quantity	Location of Storage	Site ID
1.	Class 2.1	1,200 litres	TYTL 108RP, Sai Tso Wan Road, Tsing Yi Island	HUD1 / HUD2 / HUD3
2.	Class 2.2	4,840 litres
3.	Class 3	3,300 litres
4.	Class 3	8,600 litres
5.	Class 3	13,635 litres
6.	Class 3	45,910 litres
7.	Class 3	12,500 litres	North West Tsing Yi Interchange	TM1 / TM2 / TM3
8.	Class 3	5,600 litres
9.	Class 3	1,500 litres
10.	Class 3	1,000 litres
11.	Class 3	1,000 litres

 

7.5.4.8      For DG License Nos. 1 to 6, the licenses are related to the DG storages within Site HUD1 / HUD2 / HUD3. Further review was proposed to be carried out to identify if the DG stores are within the Proposed Clearance Limit, and if there will be any potential land contamination issues to the Project.

7.5.4.9      For DG License Nos. 7 to 11, the licenses are related to the DG storages of the road management of TMCA. As shown in Table 7.2, all the TMCA facilities (Site TM1 / TM2 / TM3) are off-site facilities and will be retained.  Based on the findings of site walkover (refer to Table 7.8), potential migration of contamination from the TMCA facilities to the Proposed Clearance Limit is not anticipated. No potential land contamination issues associated with these DG storages are therefore anticipated. 

7.5.4.10   On the other hand, a total of 24 incident records were provided by FSD (23 incident records (Incident Nos. 1 to 23) were provided in June 2023 and 1 fire incident record with DG/chemicals involved (Incident No. 24) was further provided in November 2023) and the details are summarised in Table 7.6 below. Locations of the incidents are shown in Figure 2.12 of Appendix 7.1.

Table 7.6      Summary of Incidents Provided by FSD

No.	Date	Type of Incident	Address	Within the Proposed Clearance Limit?	Nature of Incident Related to Land Contamination? [1]
1.	27/1/2021	Car accident	Lamppost FC1605, near North West Tsing Yi Interchange	No	N/A
2.	21/3/2021	Vegetation fire	Tso Wan, House No.7	No	N/A
3.	21/5/2021	Traffic accident	Lamppost HM007N, near Lantau Link	Yes	To be discussed in Section 7.5.4.13
4.	24/8/2021	No. 2 fire alarm	Lamppost TY01, near North West Tsing Yi Interchange	No	N/A
5.	13/11/2021	Vegetation fire	Lantau Link, TC bound	Unknown	No
6.	15/11/2021	Vegetation fire	Sai Tso Wan Road	No	N/A
7.	28/11/2021	Mountain rescue	Sam Chuen Hillside UTM Grid Reference JK967731	No	N/A
8.	6/2/2022	Vegetation fire	Lamppost FA4900, near Tsing Yi Road West	No	N/A
9.	16/2/2022	Hoax bomb threat	Sai Tso Wan Road / Tsing Tim Street	No	N/A
10.	25/2/2022	Traffic accident	Lamppost HM008S, near Lantau Link	No	N/A
11.	15/6/2022	Traffic accident	Roadside outside MTR TYI Ventilation Building, North West Tsing Yi Interchange	No	N/A
12.	21/11/2022	Mountain rescue	Sam Chuen Tsing Chau Tsai Peninsula	No	N/A
13.	19/12/2022	No. 2 fire alarm	16 Sai Tso Wan Road, Nam Wan Tunnel and West Control Building	No	N/A
14.	24/1/2023	Traffic accident	Lamppost HM12, near North West Tsing Yi Interchange	No	N/A
15.	31/1/2023	Mountain rescue	Lamppost VC0431	No	N/A
16.	17/2/2023	No.1 fire alarm	Tsing Ma Bridge Openground underneath Tsing Yi Tower	No	N/A
17.	19/2/2023	Drown	Nam Wan Pier	Yes	No
18.	7/4/2023	No.1 fire alarm	North West Tsing Yi Interchange, Tsing Yi Administration Building, TYS2/TYS2; 2/F Telecommunication Equipment Room	No	N/A
19.	14/4/2023	Traffic accident	Lamppost TM004N, near North West Tsing Yi Interchange	No	N/A
20.	23/4/2023	No. 2 fire alarm	Lamppost BC1806, near Cheung Tsing Highway	Yes	To be discussed in Section 7.5.4.14
21.	23/4/2023	Traffic accident	Lamppost TM007S, near Lantau Link, TC Bound, Upper Deck Tsing Ma Bridge	Yes	To be discussed in Section 7.5.4.13
22.	17/5/2023	Vessel injuries	Tang Lung Chau	Yes	No
23.	18/5/2023	Mountain rescue	Lantau Link	Unknown	No
24.	22/12/2020	No. 2 fire alarm (LPG leakage)	SHELL LPG Plant, Tsing Tim Street	No	N/A

Remarks:

^[1].    N/A: Incident records outside the Proposed Clearance Limit.

 

7.5.4.11   Of the 24 incident records, 17 records (Incident Nos. 1, 2, 4, 6 to 16, 18, 19 and 24) occurred outside the Proposed Clearance Limit. For Incident No. 24, although the nature of the incident involved leakage of LPG, it was located about 140 m away from the Proposed Clearance Limit. For Incident Nos. 1, 2, 4, 6 to 16, 18 and 19, the locations of these incidents were at least 50 m away from the Proposed Clearance Limit. Thus, these incidents are not expected to pose any potential land contamination issues to the Project.  The land contamination issues associated with the remaining 7 incident records (Incident Nos. 3, 5, 17, 20 to 23) are discussed below.  

7.5.4.12   For Incident Nos. 5, 17, 22 and 23, given the nature of the incidents (vegetation fire / mountain rescue / drown / vessel injuries), potential land contamination issues associated with the incident records to the Project is not anticipated.

7.5.4.13   For the traffic related accidents (Incident Nos. 3 and 21), no stains, burn marks or stressed vegetation were observed at these locations during the site walkover. In addition, no oil / chemical leakage was involved in these incidents as based on the information provided by FSD (refer to Appendix C in Appendix 7.1). These incidents were thus not expected to pose any potential land contamination issues to the Project.

7.5.4.14   For Incident No. 20, no stains, burn marks or stressed vegetation were observed at the location during the site walkover (refer to Appendix D in Appendix 7.1). The incident was thus not expected to pose any potential land contamination issues to the Project.

7.5.5           Site Walkovers

7.5.5.1      Site walkovers were conducted on 30 October and 9 November 2023, 22 January 2025 to investigate on any contaminative issues associated with current land uses and activities within / close to the Proposed Clearance Limit.

7.5.5.2      Referring to Section 7.4.1.3, the affected facilities / works areas within the Proposed Clearance Limit were reviewed during the site walkover and findings are presented in Table 7.7.  Of the facilities / works areas, the Dockyard (Site HUD1), Sai Tso Wan Concrete Batching Plant (Site HUD2) and Vacant Land (Site LT2) were inaccessible at the time of site walkover.  Site HUD1 and Site HUD2 are currently private land lots and Site LT2 is allocated government land. For Site HUD1 and Site HUD2, peripheral inspection (i.e. from the entrance and / or boundary of the sites) was conducted.  Further site appraisal was proposed to be carried out at a later stage of the Project when these sites are accessible.

7.5.5.3      Based on Table 7.7, potentially contaminating land uses / activities identified included the public carpark within Site STW1, Dockyard (Site HUD1) and Sai Tso Wan Concrete Batching Plant (Site HUD2).  For Site STW1, patch of stain was observed on unpaved ground adjacent to the petrol oil tanker truck within the encroached portion of the public carpark. An area parked with diesel tanker trucks and oil stains were also observed on site but were located outside the Proposed Clearance Limit. No off-site land contamination issues associated with the diesel tanker truck parking area to the Project are anticipated (refer to Table 7.7 for details).

7.5.5.4      The remaining areas of the Proposed Clearance Limit were occupied by roads (e.g. Cheung Tsing Highway, Tsing Sha Highway, Northwest Tsing Yi Interchange and Lantau Link), open water, vegetated / vacant land and slopes.  No potentially contaminating land uses / activities (e.g. vehicle / equipment maintenance / refuelling activities) were observed in these areas during the site walkover.

7.5.5.5      The concerned off-site facilities / works areas in Table 7.2 were also reviewed during the site walkover and the findings are presented in Table 7.8.  Based on Table 7.8, no land contamination issues to the Project from these off-site facilities / works areas are anticipated.

7.5.6           Summary of Site Appraisal

7.5.6.1      Based on the findings of the site appraisal (including desktop review and site walkovers), three (3) potentially contaminated sites (i.e. public carpark within Site STW1, Dockyard (Site HUD1) and Sai Tso Wan Concrete Batching Plant (Site HUD2)) were identified with potential land contamination concerns to the Project.  Details of the site appraisal for the potentially contaminated sites are summarised in Table 7.7 and the site locations are shown in Figure 7.1.  Intrusive SI works are considered necessary to confirm any land contamination in the potentially contaminated sites.  For Site HUD1 and Site HUD2, as the sites were inaccessible during the site walkover, further site appraisal was proposed to be carried out at a later stage of the Project when site access is available to confirm the land uses and to identify the presence of any on-site and off-site potential contaminating sources.

7.5.6.2      Furthermore, Site LT2 within the Proposed Clearance Limit was inaccessible during site walkover.  Further site walkover was proposed be carried out at a later stage of the Project to confirm whether there are any land contamination issues within the site.

Table 7.7      Summary of Concerned Sites within Proposed Clearance Limit

Concerned Site ID	Site Name1 (Affected Lot No.) (Approx. area)	Hotspots (Approx. area)	Site Observation / Current Potentially Contaminating Activities	Corresponding Photographic Record Reference in Appendix D of Appendix 7.1	Past Potential Contaminating Land Use / Activities	Any Potential Land Contamination Issues? / Potential COCs2	Future Land Uses / RBRGs Land Use Scenario
TYTL 108RP & TYTL 80, West Tsing Yi
HUD1	Dockyard (89,500 m2) (Encroached Area: 24,000 m2)	To be confirmed when site is accessible for site walkover	The site is located at the eastern end of Tsing Ma Bridge and was inaccessible for site inspection.   Based on peripheral observations, the site was concrete paved. Administration building, crane, open storage of steel reinforcing bars, electrical substation and suspected workshop were observed within the site.  Detailed site activities could not be determined.   Based on EPD information, there was no record of spillage / leakage of chemical wastes or chemicals for the site.  However, there were a total of 4 valid and 2 invalid CWP records within the site, associating with repairing of ship, dredging industry, contracting, vehicle maintenance and marine diesel engine repair. Based on FSD information, there were no incidents involving DG/chemicals within the site.  However, there were a total of 6 issued DG licenses within lot TYTL 108RP.  As discussed in Section 7.5.4.8, further review was proposed to be carried out to identify if the DG stores are within the Proposed Clearance Limit, and if there will be any potential land contamination issues.	Photo Nos. 1058, 1085, 1199, 5712 and 5728 in PR5	· Former container storage (1983 – 2013) · Former electrical substation (1983)	Yes. Potential COCs are: · Metals · VOCs · SVOCs · PCRs · PCBs (for former & existing substation only) · Free cyanide (for shipyard only) · Dioxins and furans (for shipyard only and if presence of incineration / burning activities) · TBTO (for shipyard only)	Roads (viaducts) and works area / RBRGs (Lower of Industrial or Public Park)
HUD2	Sai Tso Wan Concrete Batching Plant (15,300 m2) (Encroached Area: 960 m2)	To be confirmed when site is accessible for site walkover	The site is located at the eastern end of Tsing Ma Bridge and was inaccessible for site inspection.   Based on peripheral observations, the site was concrete paved. Concrete batching facilities and electrical substation were observed 30 m and 10 m outside the Proposed Clearance Limit respectively.  The portion of the site encroached into the Proposed Clearance Limit consisted of access road only.   Based on EPD information, there was no record of spillage / leakage of chemical wastes or chemicals for the site.  However, there were a total of 3 CWP records potentially within the site, associated with concrete batching plant and civil engineering & construction.   Based on FSD information, there were no incidents involving DG/chemicals within the site.  However, there were a total of 6 issued DG licenses within lot TYTL 108RP.  As discussed in Section 7.5.4.8, further review will need to be carried out to identify if the DG stores are within the encroached portion of Site HUD2 and Proposed Clearance Limit, and if there will be any potential land contamination issues.	Photo No. 5746 in PR5	· Former container storage (1983) · Former open storage (1993)	Yes. Although, the encroached portion of the site consisted of access road only, there could be land contamination issues associated with past operation of container storage, open storage and concrete batching plant. In addition, the potential land contamination issues associated with nearby concrete batching facilities and electrical substation should be reviewed during site walkover at a later stage when the site is accessible.   Potential COCs are: · Metals · VOCs · SVOCs · PCRs · PCBs (for electrical substation only)	Roads (access road) / RBRGs (Lower of Industrial or Public Park)
West Tsing Yi / Sai Tso Wan
STW1	Public Carpark (STT3878K&T) and Adjacent Vegetated Land (25,700 m2) (Encroached Area: 9,100 m2)	Stain (24 m2)	The site is located in Sai Tso Wan. The carpark was largely unpaved. Private cars, long vehicles, concrete mixer trucks, and oil tanker trucks were observed.  No vehicle maintenance activities were observed / reportedly carried out at the site.   Within the encroached portion of the public carpark, general refuse scattering on the ground and a waste truck containing general refuse in the east of the encroached portion of the site were observed. No signs of chemicals / stains / spillage / stressed vegetation were observed in the vicinity of the general refuse and the waste truck. A patch of stain (approx. 24 m2) was observed on unpaved ground adjacent to a petrol oil tanker truck in the northeast of the encroached portion of the site.  No other signs of chemical stains / spillage or stressed vegetation were observed within the encroached portion of the site and the immediately surroundings.   In addition to the above, an area parked with diesel tanker trucks was observed in the southeast of the site but was located outside the Proposed Clearance Limit (approx. 80 m from the area of the site encroached to the Proposed Clearance Limit).  Multiple diesel tanker trucks were observed, connected with extended hoses to pumps and flow meters.  Oil drums were observed behind the diesel tanker trucks. The area was unpaved with oil stains observed.  Furthermore, oil stain and stressed vegetation (approx. 25 m2 in total) were observed near the diesel tanker truck parking area but were also located outside the Proposed Clearance Limit (approx. 130 m from the area of the site encroached to the Proposed Clearance Limit).   Based on EPD / FSD information, there were no CWP / chemical spillage / DG / incident records for the site.   The stain observed within the encroached portion of the public carpark could be due to the adjacent petrol oil tanker truck. There could be land contamination issues associated with the patch of stain. However, given the small size of the stain (approx. 24 m2) and any contamination likely to be shallow, the land contamination is expected to be localised.   For the diesel tanker truck parking area and referring to Section 7.4.1.2, no construction works (including soil excavation) will be carried out in the area under the Project as the area is outside the Proposed Clearance Limit.  Furthermore, as the diesel tanker truck parking area, oil stains and stressed vegetation were outside the Proposed Clearance Limit and the extended hoses, pumps and flow meters were all above ground, the diesel tanker truck parking area is not expected to be an off-site source of land contamination to the Project.  No potential land contamination issues associated with the diesel tanker truck parking area to the Project are therefore anticipated.	Photo Nos. 0847, 0851, 0852, 5620, 7474 (Diesel Tanker Truck Parking Area), 0923, 5650 (Stain), 0910, 0912 (Stain), 0827, 0888, 0901, 0927 (Stressed Vegetation), 0946, 1310 and 5658 in PR7 to PR9	N/A	Yes (for the patch of stain within the encroached portion of the public carpark).   Potential COCs are: · Metals · VOCs · SVOCs · PCRs	Roads (viaducts) / RBRGs (Lower of Industrial or Public Park)
STW2	Truck Marshalling Area (STT3194K&T) (11,400 m2) (Encroached Area: 10,500 m2)	-	The site is located in Sai Tso Wan.   Based on observation, the site was paved with concrete in good condition with no signs of chemicals or chemical stains / spillage or stressed vegetation were observed.  Parked private cars and concrete mixer truck were observed.  No vehicle maintenance / refuelling activities were observed.   Based on EPD / FSD information, there were no CWP / chemical spillage / DG / incident records for the site.	Photo Nos. 1206, 1231, 3665 and 3666 in PR6	N/A	No	N/A
WTY1	DSD Rock Storage Area (GLA-TKT 1939) (48,100 m2) (Encroached Area: 48,000 m2)	-	The works area is under Contract No. DC/2020/05 Relocation of Sha Tin Sewage Treatment Works to Caverns – main caverns construction and is located in Wok Tai Wan.  The works site is currently operated by DSD, AECOM (consultant) and China State - Alchmex Joint Venture (contractor).   Based on site observations and as reported by the site representative, the works area was unpaved and has used as a storage site for excavated rocks from Sha Tin Cavern.  No vehicle / equipment maintenance / refuelling activities are carried out on site.  No signs of chemicals or chemical stains / spillage or stressed vegetation were observed.   Based on EPD / FSD information, there were no CWP / chemical spillage / DG / incident records for the site.	Photo Nos. 1141, 1189, 5774, 7567, 7571 in PR3	N/A	No	N/A
WTY2	Former LandsD Works Area (Formerly as GLA-TKT 1926) (1,400 m2)	-	The site was previously a works area under Contract No. 8/LANDS/21 and was located in Wok Tai Wan. The works area was previously occupied by LandsD, AECOM (consultant) and Fraser Construction Company Limited (contractor) from 2018 to 2022. The works has already completed. As reported by the former site representative, the works area was previously used as storage area for construction materials (soil nail rebars, erosion control mat, wire mesh, planks, steel moulds) only. No vehicle / equipment maintenance / refuelling activities / chemical storages were reportedly carried out on site.   Based on observation, the site was currently vacant. The site was paved with bricks with no signs of chemicals or chemical stains / spillage or stressed vegetation were observed. No vehicle / equipment maintenance / refuelling activities was observed within the site.     Based on EPD / FSD information, there were no CWP / chemical spillage / DG / incident records for the site.	Photo No. 6085 in PR4	N/A	No	N/A
WTY4	Lantau Link Viewing Platform Car Park (5,300 m2)	-	The car park is located in Wok Tai Wan. Based on observation, the site was paved with bricks in good condition with no signs of chemicals or chemical stains / spillage or stressed vegetation were observed.  Parked private cars and buses were observed. No vehicle maintenance/refuelling activities were observed.   Based on EPD / FSD information, there were no CWP / chemical spillage / DG / incident records for the site.	Photo Nos. 1687 and 6094 in PR4	N/A	No	N/A
Northeast Lantau
LT1	CEDD Slope Works Site (13,800 m2) (Encroached Area: 12,500 m2)	-	The works site is under Contract No. GE/2020/10 Landslip Prevention and Mitigation Programme, 2017, Package F, Landslip Prevention and Mitigation Works and is located in Slope Features No. 10 NE-A/C 108, 500m east of the Toll Gate of North Lantau Highway. The works site is currently operated by CEDD, AECOM (consultant) and Fraser Construction Company Limited (contractor).   Based on site observations and as reported by the site representative, landslip preventive and mitigation works were carried out within the site.  Based on observation, the site is largely unpaved except the works area in the northeast of the site was paved with plywood. No vehicle / equipment maintenance / refuelling activities are carried out on site.  No signs of chemicals or chemical stains / spillage or stressed vegetation were observed.   An air compressor was observed with drip tray in good condition in the northeast of the site but was located outside the Proposed Clearance Limit. No signs of stain / spillage / stressed vegetation were observed in the vicinity of the air compressor.   Based on EPD / FSD information, there were no CWP / chemical spillage / DG / incident records for the site.	Photo Nos. 1469, 1478, 1485, 5924 and 5938 in PR1	N/A	No	N/A
LT2	Vacant Land (GLA-TIS 801 & GLA-TIS 854) (20,200 m2) (Encroached Area: 19,800 m2)	-	The site is located in Tai Chuen and was inaccessible for detailed site walkover. No peripheral inspection was conducted for the site.   Based on EPD / FSD information, there were no CWP / chemical spillage / DG / incident records for the site.	N/A	N/A	To be confirmed when site is accessible for site walkover	Works area / works storage / RBRGs (Industrial) (if applicable)
LT3	Lantau Toll Plaza Administration Building (5,900 m2) (Encroached Area: 170 m2)	-	The site is located in Northeast Lantau. Based on peripheral observations, the site was paved with concrete. Administration building and car park were observed outside the Proposed Clearance Limit.  The portion of the site encroached into the Proposed Clearance Limit consisted of access road only.  No vehicle / equipment maintenance / refuelling activities were observed within the encroached area.  No signs of chemical storage / stains / spillage or stressed vegetation were observed within the encroached area.   Based on EPD / FSD information, there were no chemical spillage / DG / incident records for the site.  There was an invalid CWP record within the site (refer to CWP ID 16 in Table 7.4), associated with the administration building.  However, as discussed above, the facilities, including the administration building, will be retained under the Project, and no signs of contamination / contaminating activities were observed within the encroached portion of the site. Based on the above, no potential land contamination issue associated with the site to the Project is anticipated.	Photo Nos. 1537 and 1541 in PR2	N/A	No	N/A

Note:

1.      Refer to Figure 7.1 for location of the sites.

2.      The potential Chemicals of Concerns (COCs) were determined based on Practice Guide. For Site HUD1 and Site HUD2, the potential COCs are subject to change based on findings of further site appraisal when the site is accessible.

VOCs – volatile organic chemicals; BTEX – benzene, toluene, ethylbenzene and xylenes; MTBE – methyl tert-butyl ether; SVOCs – semi-volatile organic chemicals;
Polyaromatic hydrocarbons (PAHs) in the RBRGs include, acenaphthene, acenaphthylene, anthracene, benzo(a)anthracene, benzo(a)pyrene, benzo(b)fluoranthene, benzo(g,h,i)perylene, benzo(k)fluoranthene, chrysene, dibenzo(a,h)anthracene, fluoranthene, fluorene, indeno(1,2,3-cd)pyrene, naphthalene, phenanthrene and pyrene;

PCRs – petroleum carbon ranges; PCBs – polychlorinated biphenyls; and TBTO – tributyltin oxide.

 

 

 

Table 7.8      Summary of Concerned Off-site Facilities / Works Areas

Concerned Site ID	Site Name1 (Affected Lot No.) (Approx. area)	Site Observation / Current Potentially Contaminating Activities	Corresponding Photographic Record Reference in Appendix D of Appendix 7.1	Past Potential Contaminating Land Use / Activities	Potential Off-Site Source of Land Contamination?
TYTL 108RP & TYTL 80, West Tsing Yi
HUD3	Sai Tso Wan 2 Concrete Batching Plant (TYLL 108RP) (13,800 m2)	The site is located at the eastern end of Tsing Ma Bridge. The site is located within the Project Area but is approximately 10 m from the Proposed Clearance Limit, separated by fences and the existing Sai Tso Wan Road. The site was inaccessible for site inspection.   Based on peripheral observation, the site was largely paved with concrete with good condition. Concrete batching facilities and electricity substation were observed within the site (approx. 23 m and 10 m from the Proposed Clearance Limit respectively). The fences and the portion of Sai Tso Wan Road were in good condition with no signs of chemicals stain / leakage / stressed vegetation observed.   Based on EPD information, there was no record of spillage / leakage of chemical wastes or chemicals for the site. However, there are a total of 3 valid CWP records associated with either Site HUD2 or HUD3.   Based on FSD information, there were no incidents involving DG/chemicals within the site. However, there were a total of 6 issued DG licenses related to either Site HUD1, Site HUD2 or Site HUD3.	Photo Nos. 1038 in PR6 and 1014 in PR7	· Former container storage (1983)	No Given there are physical separation between the site, and no signs of chemicals stain / leakage / stressed vegetation observed on the Sai Tso Wan Road, the site is therefore not considered as an off-site source of land contamination to the Project.
West Tsing Yi / Sai Tso Wan
STW3	Shell Tsing Yi Installation (TYTL 108 S.A) (150,900 m2)	The site is located in Sai Tso Wan outside the Project Area. The site is located approximately 10 m from the Proposed Clearance Limit (Site STW1), enclosed with concrete fences and separated by Sai Tso Wan Road. The site was inaccessible for the site inspection.   Based on peripheral observation, the site was paved with concrete. Fuel tanks and administration building were observed within the site. The concrete fences and the portion of Sai Tso Wan Road near the oil installations was in good condition with no signs of chemical stains / spillage and stressed vegetation observed. Based on EPD / FSD information, there were no CWP / chemical spillage / DG / incident records for the site.	Photo Nos. 1010, 0812, 0997 in PR10	· Former dockyard (1983)	No   Given there are physical separations between the site and the Proposed Clearance Limit, and no signs of chemicals stains / spillage and stressed vegetation observed in the portion of Sai Tso Wan Road near the oil installation, the site is not considered as an off-site source of land contamination to the Project.
Tsing Ma Control Area
TM2	TMCA – Workshop (5,600 m2)	The site is located in Tsing Ma Control Area (TMCA), and mainly comprise of access road, vegetation and 2 suspected workshop structures. The suspected workshop structures are located east of the site away from the Proposed Clearance Limit. Although the boundary of the site is less than 1m from the Proposed Clearance Limit, the closest distance of the workshop structures to the Proposed Clearance Limit is approximately 22 m. The site was inaccessible for site inspection.   Based on peripheral observation, areas of the site closest to the Proposed Clearance Limit were access road, concrete Jersey barriers and vegetation only. These areas separated the Proposed Clearance Limit from the suspected workshop structures and were observed in good condition with no signs of chemicals stain / leakage / stressed vegetation.   Based on EPD information, there was no record of spillage / leakage of chemical wastes or chemicals for the site. However, there were a total 4 valid and 1 invalid CWP records associated with the TMCA facilities.   Based on FSD information, there were no incidents involving DG/chemicals within the site. However, there were a total of 5 issued DG licenses associated with the TMCA facilities.	Photo Nos. 1703 and 5972 in PR4	N/A	No   Given there were physical separations between the suspected workshop structures and the Proposed Clearance Limit and the physical separations were observed in good condition with no signs of chemicals stains / spillage and stressed vegetation, the site is not considered as an off-site source of land contamination to the Project
TM3	TMCA - Tsing Yi Interchange Depot (7,100 m2)	The site is located in TCMA within the Project Area and is situated on the top of the rocky slope (refer to Photo 5738 in PR6).  The rocky slope itself is within the Proposed Clearance Limit with height of approximately 65 m.  Although the boundary of the site is less than 1m from the Proposed Clearance Limit, the nearest proposed works under the Project are expected to be the open road section of TYLL, approximately 23 m from the site.  The site was inaccessible for site inspection.   Based on peripheral observation, the site was surrounded by vegetation and the area closest to the Proposed Clearance Limit was vegetation only.  The vegetation was observed to be in good condition with no signs of stain / spillage / stressed vegetation.     Based on EPD information, there was no record of spillage / leakage of chemical wastes or chemicals for the site. However, there were a total 4 valid and 1 invalid CWP records associated with the TMCA facilities.   Based on FSD information, there were no incidents involving DG/chemicals within the site. However, there were a total of 5 issued DG licenses associated with the TMCA facilities.	Photo Nos. 3090 and 5738 (rocky slope) in PR6	N/A	No   Given the site is situated on the top of the rocky slope, and the area near the Proposed Clearance Limit were rocky slope and vegetation only, the site is not considered as an off-site source of land contamination to the Project.
Northeast Lantau
LT5	MTRL - East Lantau Traction Substation & East Lantau Tunnel (East) Ventilation Building (1,700 m2)	The site is located within the Project Area, at the base of the rocky slope. The rocky slope itself is within the Proposed Clearance Limit. The site is located approximately 3 m from the Proposed Clearance Limit.  The building structures within the site (ventilation building and traction substation) were observed separated from the Proposed Clearance Limit by the access road and fences. The site was inaccessible for site inspection.   Based on the peripheral observation, the site was paved with concrete. The fences and access road were observed in good condition with no signs of chemicals stain / leakage / stressed vegetation. Based on EPD / FSD information, there were no CWP / chemical spillage / DG / incident records for the site.	Photo Nos.1441 and 1500 in PR1	N/A	No   The site was located at the base of the rocky slope.  The physical separation (access road) between the building structures and the Proposed Clearance Limit were observed in good condition with no signs of chemicals stain / leakage / stressed vegetation.  The site is therefore not considered as an off-site source of land contamination to the Project.

Note:

1.      Refer to Figure 7.1 for the location of the sites.

7.6               Future Land Uses

7.6.1.1      Land contamination assessment on the potentially contaminated sites would need to be evaluated against the RBRGs and if there were presence of non-aqueous phase liquid (NAPL), soil saturation (C_sat) / solubility limits, as stipulated in Table 2.1 and Table 2.2 of the Guidance Manual.

7.6.1.2      The RBRGs were developed based on a risk assessment approach to suit the local environmental conditions and community needs in Hong Kong.  Decisions on contaminated soil and groundwater remediation are based on the nature and extent of the potential risks that are posed to human receptors as a result of exposure to chemicals in the soil and / or groundwater.  RBRGs were developed for four different land use scenarios as below reflecting the typical physical settings in Hong Kong under which people could be exposed to contaminated soil and groundwater:

·       Urban Residential;

·       Rural Residential;

·       Industrial; and

·       Public Park.

7.6.1.3      The proposed development includes roads and works area / works storage.  The lower of the Industrial or Public Park RBRGs land use scenarios (for the proposed roads) and Industrial RBRGs land use scenario for proposed works area / works storage are considered appropriate.

7.6.1.4      The proposed RBRGs land use scenarios recommended for this Project are summarised in Table 7.7.

7.7               Site Investigation Plan

7.7.1.1      Based on the findings of the site appraisal, intrusive SI works are considered necessary for the Public Carpark and Adjacent Vegetated Land (Site STW1), Dockyard (Site HUD1) and Sai Tso Wan Concrete Batching Plant (Site HUD2) which were identified with potential land contamination concerns to the Project. The detailed site investigation (SI) plan was proposed in the ISA (refer to Appendix 7.1) and are summarised below.  However, it should be noted that as all 3 concerned sites were still in operation and / or inaccessible, it would not be feasible to carry out the associated SI works under this EIA Study.  Further site appraisal and SI works would need to be carried out at a later stage of the Project in accordance with EPD’s Guidance Manual, Guidance Note and Practice Guide (refer to Section 7.9 for details).

Site STW1

7.7.1.2      For the Public Carpark and Adjacent Vegetated Land (Site STW1), there could be land contamination issues associated with the patch of stain (approx. 24 m²) observed within the encroached portion of the carpark and a total of 3 sampling locations were proposed to study the vertical profile of possible contamination within the area.  Details of the sampling and testing plan are shown in Table 7.9. The proposed sampling locations followed the recommended grid sampling arrangement in Table 2.1 of EPD Practice Guide and have taken into account the contamination sources (i.e. hotspots) identified during the site walkover.  The sampling locations are illustrated in Figure 7.2.  The exact sampling locations are subject to fine adjustment according to the actual site conditions and existence of underground structures/utilities as determined by the on-site land contamination specialist.  The key COCs were determined with reference to EPD’s Practice Guide and include metals, VOCs, SVOCs and PCRs.

7.7.1.3      Since the public carpark is still in operation at the time of site walkover, further site appraisal was proposed to be carried out at later stage of the Project to identify any additional hotspots and to review the need for extra sampling locations.  The final sampling and testing plan will be formulated taken into consideration any additional hotspots identified in the further site appraisal and was proposed to be reported in the CAP(s) at the later stage of the Project.

Site HUD1 and Site HUD2

7.7.1.4      The Dockyard (Site HUD1) and Sai Tso Wan Concrete Batching Plant (Site HUD2) are still in operation and inaccessible at the time of site walkover to determine the sampling locations for the SI works.  Further site appraisal is proposed to be carried out at later stage of the Project when site access is available to determine the actual sampling and testing requirements for the concerned sites.

7.7.1.5        Nevertheless, preliminary sampling and testing plans for the sites have been prepared with reference to EPD’s Practice Guide and shown in Table 7.10.  Grid sampling strategy, in accordance with Table 2.1 of the Practice Guide, was adopted. Subject to the findings of the detailed site walkover at later stage of the Project, extra sampling locations may be required for any identified additional hotspots.  The potential key COCs for Site HUD1 include VOCs, SVOCs, metals, PCRs, PCBs, free cyanide, dioxins, furans and TBTO and the potential key COCs for Site HUD2 include VOCs, SVOCs, metals, PCRs and PCBs. The potential key COCs were determined with reference to EPD’s Practice Guide.

Table 7.9      Proposed Sampling and Testing Plan

Site ID (approx. area)	Hotspot(1) (approx. area)	Sampling Location ID (1)	Sampling and Testing Rationale	Grid Size (m2)	Sampling Method	Sample Matrix/ Depth (2)		Parameters to be Tested (3)
								VOCs	SVOCs	PCRs	Metals
STW1 (25,700 m2) (Encroached area: 9,100 m2)	Stain (24 m2)	STW1-EBH01 to EBH03	Sampling to target the hotspot at the stain location (approx. 24 m2).	4	Borehole drilling to 2m below the groundwater table or 6m bgl	Soil	(i) 0.5m bgl (ii) 1.5m bgl (iii) 3.0m bgl (iv) at GW level or 6m bgl(4)	ü	ü	ü	ü
						GW	If present(4)	ü	ü	ü	Mercury only

Notes:

(1)    Refer to Figure 7.2 for hotspots and proposed sampling locations.

(2)    bgl = below ground level; GW = groundwater

(3)    The testing parameters refer to the parameters as shown in Table 2.1 – RBRGs for Soil & Soil Saturation Limit and Table 2.2 – RBRGs for Groundwater and Solubility Limit under VOCs, SVOCs, Metals and PCRs in the Guidance Manual.

Since RBRGs values of benzo(a)anthracene, benzo(a)pyrene, benzo(g,h,i)perylene, benzo(k)fluoranthene, bis-(2-Ethylhexyl)phthalate, dibenzo(a,h)anthracene, indeno(1,2,3-cd)pyrene and phenol were not available for groundwater, the said parameters would not be tested in groundwater samples.

(4)    The actual depth of soil sampling would be subjected to site constraints (e.g. encountering of boulders or underground concrete structures).  The termination depth of sampling should be at groundwater table or 6m bgl, whichever is shallower. Groundwater sample would only be collected if encountered.

Table 7.10    Preliminary Sampling and Testing Plan

Site ID (1)	Suspected Potentially Contaminating Land Use (2)	Approx. Site Area (m2)	Approx. Site Area within Proposed Clearance Limit (m2)	Testing Parameters (Potential COCs)(3)	Recommended Minimum Number of Sampling Locations within the Proposed Clearance Limit (4)
HUD1	Dockyard (including electrical substation, open storage of steel reinforcing bars and workshop), former electrical substation and former container storage	89,500	24,000	Metals (Full List), VOCs (Full List), SVOCs (Full List), PCRs, PCBs (for substation only), free cyanide (for shipyard only), dioxins and furans (for shipyard only and if presence of incineration / burning activities) and TBTO (for shipyard only)	32
HUD2	Concrete batching plant, electrical substation, former container storage and former open storage	15,300	960	Metals (Full List), VOCs (Full List), SVOCs (Full List), PCRs and PCBs (for electrical substation only)	6

Notes:

(1)         Refer to Figure 7.1 for the sites.

(2)         Due to limited site access and only peripheral site inspections were carried out, the land use may be subject to change after further site appraisal.

(3)         The potential COCs are based on findings of the Practice Guide and will be confirmed after the site is accessible for further site appraisal.

Full list refers to the parameters as shown in Table 2.1 – RBRGs for Soil & Soil Saturation Limit and Table 2.2 – RBRGs for Groundwater and Solubility Limit under metals, Volatile Organic Compounds (VOCs), Semi-Volatile Organic Compounds (SVOCs), and Petroleum Carbon Ranges (PCRs) in the Guidance Manual.

PCBs refer to polychlorinated biphenyls

TBTO refers to tributyltin oxide

(4)         Based on Table 2.1 of Practice Guide and site area within the Proposed Clearance Limit.  The actual number of sampling locations will be subject to the findings of the further site appraisal when the site is accessible.

7.8               Initial Evaluation of Potential Land Contamination Impact

7.8.1.1      Based on the site appraisal, a total of three (3) potentially contaminated sites (i.e. Site STW1 (Public Carpark and Adjacent Vegetated Land), Site HUD1 (Dockyard) and Site HUD2 (Sai Tso Wan Concrete Batching Plant)) were identified within the Proposed Clearance Limit.  As all three (3) concerned sites were still in operation and / or inaccessible, it would not be feasible to carry out the associated SI works under the EIA Study.

7.8.1.2      For the Public Carpark and Adjacent Vegetated Land (Site STW1), the stain within the existing public carpark and the Proposed Clearance Limit was identified as potential hotspot.  Referring to Table 7.7, the stain (approximately 24 m²) was considered small in size with any contamination likely to be shallow.  As reported by EPD and FSD, there are no records of chemical spillage / leakage accidents within the site.  It is therefore considered that the contamination (if indeed present) would likely to be localised and extensive contamination is not expected within the Proposed Clearance Limit.

7.8.1.3      For Site HUD1 and Site HUD2, the sites are/were used for potentially contaminating land uses such as dockyard, concrete batching plant, electrical substation, container storage and open storage but were inaccessible at the time of site walkover.  Further site appraisal would need to be carried out when site access is available to confirm the land uses and the presence of any potential contaminating sources.

7.9               Mitigation of Adverse Environmental Impacts

7.9.1           Recommended Further Works

7.9.1.1      Referring to Section 7.8 above, it is considered not feasible to carry out the SI works under the EIA Study within the three (3) potentially contaminated sites (i.e. Site STW1 (Public Carpark and Adjacent Vegetated Land), Site HUD1 (Dockyard) and Site HUD2 (Sai Tso Wan Concrete Batching Plant)).  Moreover, there is an existing Vacant Land (Site LT2) which was inaccessible at the time of site walkover.   Based on the tentative construction programme, land clearance / resumption for the Project would not commence until 2026, there could be changes in the operation or land use within the three (3) potentially contaminated sites and the inaccessible site which may cause further contamination issues.  Further site appraisal should be carried out within the Proposed Clearance Limit and off-site facilities / works areas at a later stage of the Project to confirm / update the land uses / activities and to identify the presence of on-site and off-site potential contamination sources. In addition, should there be any expansion of the Proposed Clearance Limit, further site appraisal would also be required to be carried out within the expanded area.  CAP(s), presenting the findings of the further site appraisal, the latest site conditions of the concerned sites and updated sampling strategy and testing protocol, should be submitted to EPD for approval.

7.9.1.2      The further site appraisal and submission of CAP(s) should be carried out prior to the commencement of the SI works.  The SI works should be carried out according to EPD’s approved CAP(s).  Following the completion of SI works and receipt of laboratory test results, Contamination Assessment Report(s) (CAR(s)) should be prepared to present the findings of the SI works and to discuss the presence, nature and extent of contamination.  If contamination is identified, Remediation Action Plan(s) (RAP(s)) which provides details of the remedial actions for the identified contaminated soil and / or groundwater should be endorsed by EPD.  The remedial actions should be formulated with consideration given to the Source-Pathway-Receptor Paradigm by adopting the appropriate control method(s) (i.e. source control method, pathway control method and/or receptor control method).  To minimise the cost of remediation work, if remediation is required and where appropriate, “pathway control” approach, e.g. by proper capping the source of contamination by soil or concrete slabs or by the use of membranes or solidification, would be considered to prevent migration of contaminants.

7.9.1.3      Remediation action, if necessary, will be carried out according to EPD endorsed RAP(s) and Remediation Report(s) (RR(s)) will be submitted after completion of the remediation action.  The RR(s) should be endorsed by EPD prior to the commencement of construction works at the respective identified contaminated areas (if any).  The submission of CAP(s), associated SI works and any necessary remediation should be carried out prior to the commencement of construction works.

7.9.2           Mitigation Measures for Remediation Works

7.9.2.1      Mitigation measures for the remediation works would depend on the nature / extent of contamination and the method of remediation.  The mitigation measures will be recommended in the RAP and would typically include the following:

·       Excavation profiles must be properly designed and executed with attention to the relevant requirements for environment, health and safety;

·       Excavation shall be carried out during dry season to minimise contaminated run-off from contaminated soils;

·       Supply of suitable clean backfill material (or treated soil) after excavation;

·       Stockpiling site(s) shall be lined with impermeable sheeting and bunded.  Stockpiles shall be fully covered by impermeable sheeting to reduce dust emission.  If this is not practicable due to frequent usage, regular watering shall be applied.  However, watering shall be avoided on stockpiles of contaminated soil to minimise contaminated run-off;

·       Vehicles containing any excavated materials shall be suitably covered to limit potential dust emissions or contaminated wastewater run-off, and truck bodies and tailgates shall be sealed to prevent any discharge during transport or during wet conditions;

·       Speed control for the trucks carrying contaminated materials shall be enforced;

·       Vehicle wheel and body washing facilities at the sites’ exit points shall be established and used; and

·       Pollution control measures for air emissions (e.g. from biopile blower and handling of cement), noise emissions (e.g. from blower or earthmoving equipment), and water discharges (e.g. run-off control from treatment facility) shall be implemented and complied with relevant regulations and guidelines.

 

7.10            Evaluation of Residual Impact

7.10.1.1   The recommended further land contamination assessment and, if required, remediation works for the Project site would follow EPD’s Guidance Manual, Guidance Note and Practice Guide and any soil / groundwater contamination would be identified and properly remediated prior to the commencement of construction works under the Project.  Land contamination impacts are therefore considered acceptable if the follow up actions as outlined in Section 7.9 were followed and contaminated soil and groundwater (if any) were properly remediated using appropriate remediation methods and according to the EPD approved RAP.  No unacceptable residual impacts are anticipated.

 

7.11            Environmental Monitoring and Audit

7.11.1.1   Remediation works, if necessary, would be carried out based on the recommended further works outlined in Section 7.9.  Mitigation measures as recommended in the future EPD approved RAP should be implemented during the remediation works.  The Environmental Monitoring and Audit (EM&A) requirements should be carried out in the form of monthly site inspection to ensure the recommended mitigation measures are properly implemented.

 

7.12            Conclusion

7.12.1.1   A site appraisal, in the form of desktop review and site walkover, was conducted from May 2023 to January 2025 to identify for any current/historical potentially contaminating land uses. Based on the site appraisal, three (3) potentially contaminated sites (i.e. Public Carpark and Adjacent Vegetated Land (Site STW1), Dockyard (Site HUD1) and Sai Tso Wan Concrete Batching Plant (Site HUD2)) were identified with potential land contamination concerns to the Project.  Of the three (3) potentially contaminated sites, only Public Carpark and Adjacent Vegetated Land (Site STW1) was accessible for site walkover.

7.12.1.2   Sampling and testing plan had been proposed for the Public Carpark and Adjacent Vegetated Land (Site STW1) to target the hotspot with the stain.  A total of 3 sampling locations were proposed for soil and groundwater sample collection.  The collected samples will be tested for the identified COCs (i.e. metals, VOCs, SVOCs and PCRs).

7.12.1.3   For the potentially contaminated sites that were inaccessible at the time of site walkover (i.e. Dockyard (Site HUD1) and Sai Tso Wan Concrete Batching Plant (Site HUD2)), preliminary sampling and testing plans had been proposed in ISA.  It is recommended that further site appraisal should be carried out at later stage of the Project when site access is available to determine the actual sampling and testing requirements.  The potential key COCs for Site HUD1 include VOCs, SVOCs, metals, PCRs, PCBs, free cyanide, dioxins, furans and TBTO and the potential key COCs for Site HUD2 include VOCs, SVOCs, metals, PCRs and PCBs.

7.12.1.4   The proposed SI works for the three (3) potentially contaminated sites are considered not feasible to be carried out under the EIA Study.  In addition, the Vacant Land (Site LT2) was inaccessible at the time of the site walkover.  Moreover, based on the tentative construction programme, land clearance / resumption for the Project would not commence until 2026, there could be changes in the operation or land use within the three (3) potentially contaminated sites and the inaccessible site which may cause further contamination issues.  Further site appraisal should be carried out within the Proposed Clearance Limit and off-site facilities / works areas at a later stage of the Project in order to confirm / update the land uses / activities and to identify the presence of on-site and off-site potential contamination sources. In addition, should there be any expansion of the Proposed Clearance Limit, further site appraisal would also be required to be carried out within the expanded area.  CAP(s), presenting the findings of the further site appraisal, the latest site conditions of the concerned sites and updated sampling strategy and testing protocol, should be submitted to EPD for approval.  The recommended further assessment and remediation works, including the submission of CAP(s), CAR(s)/RAP(s) and RR(s) should follow relevant Guidance Manual, Guidance Note and Practice Guide.

7.12.1.5   With the implementation of the recommended follow-up works for the Project, any soil / groundwater contamination would be identified and properly remediated prior to the construction works.  No insurmountable land contamination impacts to the Project are therefore anticipated.