7 land contamination

7.1 Introduction

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

7.2 Environmental Legislation, Standards and Criteria

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

· Section 3 (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);

· Guidance Note for Contaminated Land Assessment and Remediation (Guidance Note)

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 clean-up of contaminated sites;

· Practice Guide for Investigation and Remediation of Contaminated Land (Practice Guide)

This guide outlines typical investigation methods and remediation strategies for the range of potential contaminants typically encountered in Hong Kong; and

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

The Guidance Manual introduces the risk based approach in land contamination assessment and present instructions for comparison of soil and groundwater data to the Risk-Based Remediation Goals (RBRGs) for 54 chemicals of concern 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.

7.3.1.2 A site appraisal, including site walkover and desktop review, was conducted to identify the potentially contaminating activities that may pose adverse impact to the Project. Site walkover was conducted within the Project Area to review the general site conditions and to identify any sources of land contamination (or ‘hotspots’). For the desktop review, the following information was reviewed:

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

· Hong Kong Geological Survey Map (Series HGM20) – Sheet No. 6, 7 and 11 (1:20,000);

· Records on dangerous goods, chemical wastes, chemical spillage/leakage and fire incidents from the identified potentially contaminated sites from Environmental Protection Department (EPD) and Fire Services Department (FSD); and

· Review of available geological information in Site Investigation Requirement (Stage 2) Report for the Project.

7.3.1.3 If potentially contaminated land use(s) were identified within the Project Area, the potential land contamination impacts arising from the Project would be evaluated and appropriate mitigation measures would be recommended. A Contamination Assessment Plan (CAP) and if necessary, Contamination Assessment Report (CAR) and Remediation Action Plan (RAP) would be submitted to EPD for endorsement. Any contaminated soil and/or groundwater should be treated according to EPD’s approved RAP. A Remediation Report (RR), demonstrating adequate clean-up, should be submitted to EPD for endorsement prior to the commencement of any development or redevelopment works within the Project Area.

7.4 Description of the Environment

7.4.1.1 The Project is to widen a section of the existing TWR in Tsuen Wan District and Kwai Tsing District with provision of slip roads and associated junction improvement works. The location of the Project, including the associated areas (e.g. works areas), is shown in Figure 2.4.1, Figure 2.4.2, Figure 2.4.3, Figure 2.4.4, Figure 2.4.5 and Figure 2.4.6. The scope of works is described as follows:

· Widening of a section of an elevated carriageway of TWR between Tai Ho Road and Wing Shun Street, from a three-lane carriageway to a four-lane carriageway on Kowloon bound;

· Widening of a section of an elevated carriageway of TWR between Wing Shun Street and Wing Kei Road, from a dual two-lane carriageway to a dual three-lane carriageway;

· Widening of a section of an at-grade carriageway of TWR between Wing Kei Road and KTI, from a dual three-lane carriageway to a dual five-lane carriageway;

· Widening of a section of an elevated carriageway of TWR between KTI and Container Port Road, from a three-lane carriageway to a four-lane carriageway on Kowloon bound (its implementation is yet to be ascertained and subject to further traffic review);

· Construction of a slip road connecting TWR (Kowloon bound) to Tsing Tsuen Road (Slip Road C) (its implementation is yet to be ascertained and subject to further traffic review);

· Construction of a slip road connecting TWR (Tuen Mun bound) and Hoi Hing Road (Slip Road E);

· Provision of noise mitigation measures including noise barriers/enclosures and low noise surfacing materials on associated road sections of Tsuen Wan Road; and

· Ancillary works including geotechnical, drainage, waterworks, lighting, landscaping works, installation of traffic aid facilities, etc.

7.4.1.2 As shown in Figure 2.1, the Project is located on a generally flat terrain and the Project covers Tsuen Wan area and Kwai Tsing area. The northern boundaries of the Project are at TWR near Chai Wan Kok Interchange, while the southern boundaries of the Project are at TWR near Kwai Tsing Interchange. Soil excavation would be required for the construction of at-grade roads and piers of elevated roads.

7.4.1.3 Based on the latest engineering design and as shown in Figure 7.2, Figure 7.3, Figure 7.4, Figure 7.5, Figure 7.6, Figure 7.7 and Figure 7.8, the Project Area includes the existing Tsuen Wan South Substation and Tsuen Wan Regional Lab Substation, and partially includes the Kwai Hei Street Car Park and HyD Site Office / Depot under Contract No.03/HY/2019. Based on the latest design, the proposed road works will not encroach into these existing facilities and these facilities will be retained under the Project. The Project Area also includes the existing Kwai Chung Park, existing Drainage Services Department (DSD) Maintenance Depot and Lands Department (LandsD) Site Depot. According to the latest engineering design, no excavation works would be anticipated for these sites except for the proposed pier location within the LandsD Depot (refer to Figure 7.5) and the existing slope in Kwai Chung Park along Tsuen Wan Road (refer to Figure 7.7).

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 October 2021 to May 2022 with site walkovers conducted in November and December 2021. Findings of the site appraisal are summarized below.

7.5.2 Review of Previous EIA Study

Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange, and associated junction improvement works

7.5.2.1 A land contamination assessment was conducted under the approved EIA Report for Tsuen Wan Bypass, widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange, and associated junction improvement works (Register No.: AEIAR-124/2008)[1]. The assessment was conducted in accordance with the EIAO-TM as well as EPD’s guidelines at the time of the report. The EIA Report was approved in December 2008. The assessment area of the approved EIA Report largely covered the current Project Area (refer to Figure 7.1). The assessment included desktop study (e.g. review of aerial photographs, survey maps, Outline Zoning Plans (OZPs) and site reconnaissance. Site reconnaissance was conducted in August 2007.

7.5.2.2 According to the approved EIA report, no potentially contaminated sites were identified within the assessment area. However, there are potentially contaminative land uses identified in the vicinity of the assessment area. The current Project Area would partially encroach into one of these identified potentially contaminative land uses (i.e. the Gin Drinkers Bay (Restored) Landfill) (refer to Figure 7.7 and Figure 7.8).

Flyover from Kwai Tsing Interchange Upramp to Kwai Chung Road

7.5.2.3 A land contamination assessment was conducted under the approved EIA Report for Flyover from Kwai Tsing Interchange (KTI) Upramp to Kwai Chung Road (KCR) (Register No.: AEIAR-190/2015). The assessment was conducted in accordance with the EIAO-TM as well as EPD’s prevailing guidelines. The EIA Report was approved in August 2015. The assessment area of the approved EIA Report covered the southern end of the Project Area (refer to Figure 7.1). The assessment included review of aerial photographs, review of relevant information from various departments and site walkovers. Site walkovers were conducted in November 2013.

7.5.2.4 According to the approved EIA report, the Public Works Regional Laboratory of Tsuen Wan was identified as a potentially contaminated land use. The Public Works Regional Laboratory of Tsuen Wan would partially encroach into the current Project Area. According to a memo between LandsD and the allocatee of the laboratory site (i.e. CGE/Standards & Testing, CEDD) dated 7 June 2012 provided in the approved EIA report, the allocatee shall ensure the laboratory site is free from contamination and in event of land contamination found on the laboratory site, the allocatee will be responsible to carry out the remediation works to remove all the contaminants from the laboratory site at the expiry of the allocation. CEDD was contacted for the relevant records of completion of land contamination and/or remediation works for the laboratory site. Based on the reply from CEDD on 31 August 2022, the Public Works Regional Laboratory (Tsuen Wan) was free from contamination during their use and occupancy from 2013 to 2020, as confirmed by LandsD and EPD. No further land contamination assessment / remediation works were considered necessary.

7.5.3 Review of Historical Land Uses

7.5.3.1 A review of aerial photographs in the period has been undertaken to evaluate the likelihood of potential contamination associated with past land uses within the Project Area. Findings of the review are summarised in Table 7.1 and the reviewed aerial photographs are provided in Appendix 7.1.

Table 7.1 Aerial Photographs Reviewed

Year	Reference of Aerial Photos in Appendix 7.1 (Photo Reference Number)	Site Description
1963	AP1 to AP3 (#1963_0890; #1963_1115; #1963_8216)	The northern and southern ends of the Project Area were mainly occupied by open waters. Various factories (textile, weaving, plastic works and enamel factories), reclamation works and agricultural land were observed in the centre of the Project Area. Gin Drinkers Bay Road and the existing Texaco Road were also observed.
1976	AP4 to AP6 (#15436; #15452; #15465)	Factories were observed along the existing Texaco Road in the centre of the Project Area. The construction site for the existing TWR was also observed. Reclaimed land and Gin Drinkers Bay Landfill were observed in the south of the Project Area. No significant land use changes were observed in the remaining areas of the Project Area.
1983	AP7 to AP9 (#50598; #50619; #50652)	The existing TWR, Kwai Hei Street, Container Port Road, Kwai Tsing Road and Hing Fong Road were observed in the south of the Project Area. Gin Drinkers Bay Landfill had undergone redevelopment and a container storage was also observed in the south of the Project Area. Reclamation and construction works for other sections of the existing TWR were observed in the northern and central portions of the Project Area. The existing Lung Tak Street had been constructed while the factories were no longer observed in the centre of the Project Area.
1993	AP10 to AP12 (#CN04782; #CN04783; #CN04786)	A car park, the existing rest garden (Hoi Shing Garden), an electrical substation (Hoi Shing Road Substation), Hing Shing Temporary Housing Area, construction works and existing roads were observed in the north of the Project Area. The existing electrical substation (Tsuen Wan South Substation) and the existing TTI had been constructed. Existing car park were observed in the centre of the Project Area. The container storage in the south of the Project Area was replaced by a works area. The existing Kwai Chung Park, refuse collection point (Kwai Shun Street Refuse Collection Point) and Kwai Shun Street Playground were also observed.
2003	AP13 to AP15 (#CW47182; #CW47184; #CW47201)	Hing Shing Temporary Housing Area had been demolished and a works area with an electrical substation and a car park were observed in the north of the Project Area. Car park, existing Tsuen Wan Park and Tsuen Wan Driving Test Centre were observed in the centre of the Project Area. A portion of the works area in the south of the Project Area was replaced by a car park. The existing Tsing Kwai Highway, Public Works Regional Laboratory (Tsuen Wan), Kwai Shun Street Cooked Food Market and Kwai Shun Street Public Toilet were also observed.
2013	AP16 to AP18 (#CS45124; #CS45551; #CS45752; #CS45789)	The works area in the north of the Project Area was partially replaced by car parks and vacant land. The electrical substation within the works area was no longer present. An electrical substation was observed in the southeastern corner of the works area at the junction of Hoi Hing Road and Hoi Kok Street. The Hoi Shing Road Substation was no longer present and turned into the existing car park. The existing car park was observed adjacent to the existing Tsuen Wan Driving Test Centre in the centre of the Project Area. The works area in the south of the Project Area was turned into a car park.
2020	AP19 to AP21 (#E100484C; #E109469C; #E109472C; #E110047C; #E111129C; #E111130C; #E111133C; #E111644C)	The works area and the electrical substation in the north of the Project Area were vacated and the existing Hoi Shing Road Refuse Collection Point was observed. No significant land use changes were observed in the remaining of the Project Area.

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

7.5.3.2 Based on the review of aerial photographs, the potentially contaminating land uses identified within the Project Area included the former Gin Drinkers Bay Landfill, former factories, former container storage, electrical substations and Public Works Regional Laboratory (Tsuen Wan).

7.5.3.3 For the former Gin Drinkers Bay Landfill (year 1976 to 1983) (currently the Kwai Chung Park), as discussed in Section 7.4.1.3, the proposed road alignment will partially encroach into the former Gin Drinkers Bay Landfill (the existing slope in Kwai Chung Park). Given that filling and placement of cover soils were completed during the restoration of Gin Drinkers Bay Landfill / development of existing Kwai Chung Park in 1980-90s, and only shallow excavation would be anticipated for the encroached portion of the site which would not encroach into / penetrate the cover soil / capping layer of the landfill, no potential land contamination issues associated with operation of the former landfill is expected for the Project.

7.5.3.4 According to the latest engineering design, the proposed road alignment will not encroach into the former container storage (existing open car park), former Hoi Shing Road Substation (existing open car park), 2 former substations in the works area at the junction of Hoi Hing Road and Hoi Kok Street (existing vacant land) and the existing Tsuen Wan South Substation. Therefore, no potential land contamination issues associated with operation of the former container storage and the electrical substations are expected for the Project.

7.5.3.5 Although there could be potential land contamination issues associated with the former factories (textile, weaving, plastic works and enamel factories), the former factories were demolished and redeveloped for the construction of the existing TWR and TTI at least 30 years ago (refer to Drawing No. AP2, AP5, AP8 and AP11 in Appendix 7.1). Contaminated soil, if any, would have been removed as part of the construction works. In addition, there were no evidence of land contamination issues (e.g. oil stains, stressed vegetation, chemical storage, past chemical waste producers (CWPs) / dangerous goods (DG) records and chemical spillage / chemical leakage / fire incidents records) associated with the past operation of the factories (refer to Sections 7.5.5 to 7.5.6). Therefore, no potential land contamination issues associated with these former land uses are anticipated for the Project.

7.5.3.6 For the Public Works Regional Laboratory (Tsuen Wan), as discussed in Section 7.5.2.4, the laboratory was confirmed to be free from contamination during CEDD’s use and occupancy from 2013 to 2020. Therefore, no further land contamination assessment / remediation works were considered necessary.

7.5.3.7 Based on the review above, no potential land contamination issues associated with historical land uses were identified within the Project Area.

7.5.4 Site Geology

7.5.4.1 According to the Hong Kong Geological Survey (HKGS) of Map Sheet No. 6 (Edition II), Sheet No. 7 (Edition II) and Sheet No. 11 (Edition II), the superficial geology of the Project Area across TWR comprises of mainly fill (originated from natural earth and waste) over the reclaimed land between Tuen Mun Road and TTI, and between Kwai Chung Park and Container Port Road South. The fill stratum mainly comprises inter-bedding layers of fine and coarse materials over the reclamation area. A relatively deep layer of fill can be found at the locations of Clague Garden State Estate, Tsuen Wan Park and KTI. Grave and cobble rockfill fragments are generally present near the bottom fill layer.

7.5.4.2 A layer of marine deposit of the Hung Hau Formation is present beneath the fill immediately in Tsuen Wan and Kwai Fong areas. The materials generally comprises of marine mud and locally with marine sand. This marine deposit stratum starts from Hoi Hing Road and varnishes at the northern boundary of Tsuen Wan Park, beyond which only pockets of marine mud and marine sand are found. In the southeastern portion of the Project Area, the marine deposit layer is identified between Kwai Chung Park and Kwai Chung Road.

7.5.4.3 The alluvium stratum, which typically comprises of interbedded silt/clay and sand material with variable amount of gravel and cobble sized rock fragments are encountered underneath the marine deposit layer. Some debris flow deposits/ colluvium is identified along the southern flank of the natural hillside to the north of Tuen Mun Road, and on the north of Kwai Chung Park beneath TWR.

7.5.4.4 The solid geology of the Project Area comprises of mainly fine to coarse-grained Granite on southern portion, and porphyritic fine to medium-grained Granodiorite on the northern portion of the alignment. According to the Published Geological Map Sheet 7 Edition II (2008) and Sheet 11 Edition II (2012), the Middle Jurassic Tai Po Granodiorite (Jmt_gd/Jp_d) was intruded by Late Jurassic Shatin medium to coarse grained Granite. Both rock suites were latterly intruded by Late Jurassic Needle Hill fine-grained Granite (Jkn_gf). With reference to the existing borehole information, the road alignment between Chai Wan Kok and TTI is predominantly underlain by Granodiorite; and the road alignment on the south of TTI is predominantly underlain by Granite. At some locations, the hydrothermal alteration is apparently to be taken place in the granodiorite or granite as evidenced by the infilling or coating of chlorite or calcite, and highly fractured rock mass.

7.5.4.5 Upper Jurassic Yim Tin Tsai Formation coarse ash crystal Tuff (Jyt_cat), with some local intrusion of Dacite (Jp_d), is noted beyond the northern most portion of the Project Area near Chai Wan Kok. The contact between the Tuff and Granodiorite is located approximately on the north of Tuen Mun Road in Chai Wan Kok with reference to the existing borehole information

7.5.4.6 Basalt dykes, Porphyritic fine-grained Granite dykes (Jkn_gf), East Lantau Feldsparphic Rhyodacite to Porphyritic Granite dykes (Jkd_rf) are present in the form of localized intrusions between TTI and Kwai Chung Park.

7.5.4.7 Referring to the existing ground monitoring records, the shallow groundwater table is identified which is generally between 2m and 4m below ground level, and locally drops to approximately 15m below ground level in the upper slope of Chai Wan Kok and the area between Tsuen Tsing Interchange and Kwai Chung Park.

7.5.5 Information from Government Departments

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

7.5.5.2 EPD and FSD’s replies on the request have been received and attached in Appendix 7.2. The information is summarised below.

Environmental Protection Department

7.5.5.3 Based on the replies given by EPD on 17 and 20 September 2021, there is no record of spillage / leakage of chemical wastes or chemicals within the Project Area.

7.5.5.4 Further to the EPD’s reply, visit to EPD’s Southorn Centre Office was undertaken on 3 November 2021 to review the available CWP records. Email replies were received from EPD on 30 December 2021 and 14 January 2022, provided with supplementary information. A total of 13 valid and 6 invalid CWP records were found related with the Project Area. The details are summarised in Table 7.2 below and locations of the CWPs are indicated in Figure 7.9.

Table 7.2 Summary of Chemical Waste Producers within the Project Area

CWP ID	Status	Company Name	Address	Business Nature	Types of Chemical Waste
1	Valid	Richwell Civil Joint Venture	Tsuen Wan Promenade between Tsing Tsuen Bridge and Bayview Garden, Tsuen Wan, N.T.	Construction Cycle Track	Unknown
2	Valid	Gammon Construction LTD.	Site Office at Junction of Hoi Hing Road and Hoi Kok Street, Tsuen Wan, New Territories	Civil Engineering & Contractors	Unknown
3	Valid	Tysan Building Construction Co Ltd	Junction of Hoi Hing Road and Tai Chung Road to the northwest of TW5, Tsuen Wan	Construction	Unknown
4	Valid	Welcome Construction Company Limited	3 Hoi Kok Street, Tsuen Wan, N.T.	Construction	Spent motor oil barrel, spent diesel oil barrel, waste battery
5	Valid	South Kings Development Limited and Kum Shing (K F) Construction Co LTD jointly trading as South Kings - Kum Shing Joint Venture	TKT 1734, Wing Shun Street, Kwai Chung, NT	Lighting Project	Unknown
6	Valid	South Kings Development Limited and Kum Shing (K F) Construction Co LTD jointly trading as South Kings - Kum Shing Joint Venture	Construction Site of HyD Contract No. 03/HY/2019 at Lot No. TKT 1734, Wing Shun Street, Kwai Chung, NT	Lighting Project	Unknown
7	Valid	CLP Engineering Limited	Wing Shun Street, Kwai Chung, NT	Power Industry Consultancy	Unknown
8	Valid	Suez NWS R&R (Hong Kong) Limited	Gin Drinkers Bay Landfill, Kwai Chung Park, Kwai Chung, NT	Aftercare of Landfill Restoration	Unknown
9	Valid	Director of Civil Engineering	Public Works Regional Laboratory (Tsuen Wan) Container Port Road South, Kwai Chung, NT	Material Testing	Unknown
10	Valid	Peako Engineering Co. Limited	Construction Site at Tsuen Wan Road, (Near Kwai Tsing Interchange) Kwai Chung, Kowloon, (Contract no. HY/2020/08, Flyover from Kwai Tsing Interchange Upramp to Kwai Chung Road)	Construction	Unknown
11*	Valid	Arbat Construction Company Limited	Portion "B" of site, Wing Tak Street, Tsuen Wan, N.T.	Water Works	Unknown
12*	Valid	Ming Hing Waterworks Engineering Co. Ltd	36 Wing Tak Street, Tsuen Wan East, N.T.	Engineering and Construction	Unknown
13	Valid	Water Supplies Dept - New Territories West	Near Hoi Hing Road, Tsuen Wan, NT	Provision of Municipal Water Supplies and Attendant Services	Unknown
14	Invalid	China Geo-engineering Corporation	Construction Site at Hoi Shing Road Opposite to Cable TV Tower, Tsuen Wan, New Territories	Sewage Works	Unknown
15	Invalid	Barbican Construction Co. LTD	Site Office at Hoi Hing Road Near Hoi Kok Street, Tsuen Wan, New Territories	Construction - Roadwork for cable laying (CLP)	Unknown
16	Invalid	Lam Construction CO., LTD	TWTL 336, CLP POWER Tsuen Wan South 132kV Substation, Wing Tak Street, Tsuen Wan, New Territories	Electrical Installation Ring Main Units (RMU)	Unknown
17	Invalid	Leader Civil Engineering Corporation Limited	Tsing Tsuen Bridge at Tsing Yi and Tsuen Wan Approaches, Kwai Tsing, New Territories	Retrofitting of Noise Barrier	Unknown
18	Invalid	Lee & CO. Engineering and Mak Hang Kei (HK) Construction Limited	Lot No. TKT 1734, Wing Shun Street, Kwai Chung, NT.	Construction	Unknown
19	Invalid	China State Construction Engineering (Hong Kong) Limited	Wing Tak Street (Underneath Tsuen Wan Road), Texaco Road, Tsuen Wan, N.T.	Construction	Unknown
* The exact locations of the address in CWP ID 11 and 12 could not be determined.

7.5.5.5 CWP ID 1 (Richwell Civil Joint Venture) is associated with the construction of the existing cycle track along Hoi Hing Road and Hoi On Road, which is partially encroached into the Project Area. Given that no relevant construction sites / chemical waste storages / stains or spillage were observed within the Project Area during the site walkover (refer to Photo 8014 in PR1 of Appendix 7.3), the storage of chemical wastes associated with this CWP record is unlikely to have caused any land contamination issues to the Project.

7.5.5.6 CWP ID 2 (Gammon Construction LTD.) is likely to be associated with a former temporary operation of the HyD / Gammon Reconstruction and Improvement of Tuen Mun Road – Eastern Section Site Office (year 2008 to 2013)[2] at junction of Hoi Hing Road and Hoi Kok Street within the Project Area. The registration is likely to be inactive as the relevant construction works was completed in 2013. Based on the site walkover, the site is currently vacant (refer to Photo 9003 in PR1 of Appendix 7.3). Given that the operation of the site office was temporary and no chemical waste storages / stains or spillage were observed at this site during the site walkover, the storage of chemical wastes associated with this CWP record was unlikely to have caused any land contamination issues to the Project.

7.5.5.7 CWP ID 3 (Tysan Building Construction Co Ltd) is likely to be associated with the construction of the existing Hoi Hing Road Refuse Collection Point within the Project Area. The registration is likely to be inactive as the associated construction work was completed in 2015[3]. Given that the construction works was temporary (year 2013 to 2015) (refer to Drawing No. AP16 and AP19 in Appendix 7.1) and no relevant construction sites / chemical waste storages / stains or spillage were observed within the existing Hoi Hing Road Refuse Collection Point during the site walkover (refer to Photo 4980 in PR2 of Appendix 7.3), the storage of chemical wastes associated with this CWP record was unlikely to have caused any land contamination issues to the Project.

7.5.5.8 CWP ID 4 (Welcome Construction Company Limited) is the current contractor of the DSD Maintenance Depot under ongoing DSD Contract No. DC/2019/02 Drainage Maintenance and Construction in Mainland South District (2019-2023) at Hoi Kok Street within the Project Area. According to the latest engineering design, no excavation works within this maintenance depot is proposed under the Project. Therefore, potential land contamination issues associated with this CWP record to the Project are not anticipated.

7.5.5.9 CWP ID 5 and 6 (South Kings Development Limited and Kum Shing (K F) Construction Co LTD jointly trading as South Kings - Kum Shing Joint Venture) are associated with the existing construction site office / depot under ongoing HyD Contract No. 03/HY/2019 Management, Operation, Installation and Maintenance of Public Lighting System in New Territories West (2019-2023) at Wing Shun Street (Lot No. TKT 1734), which is partially encroached into the Project Area (refer to Photo 1091 in PR8 of Appendix 7.3). On the other hand, CWP ID 18 (Lee & CO. Engineering and Mak Hang Kei (HK) Construction Limited) is likely to be associated with the previously completed HyD contract(s) occupying the same site, included but not limited to Contract No. 15/HY/2000 Management, Operation, Installation and Maintenance of Public Lighting System in New Territories West (2001-2004)[4]. According to the latest engineering design, no excavation works within this construction site depot is proposed under the Project. Therefore, potential land contamination issues associated with these CWP records to the Project are not anticipated.

7.5.5.10 CWP ID 7 (CLP Engineering Limited) is likely to be associated with the power industry consultancy at Wing Shun Street under completed HyD Contract No. 01/HY/2011 Management, Operation, Installation and Maintenance of Public Lighting System in New Territories West (2011-2015). The registration for CWP ID 7 is likely to be inactive as the associated contract was ended. As there were no relevant construction sites observed within the Project Area during the site walkover, and there were no signs of stains / chemical waste storage / spillage observed at these locations during the site walkover, the storage of chemical wastes, if any, associated with this CWP record is unlikely to have caused any land contamination issues to the Project.

7.5.5.11 CWP ID 8 (Suez NWS R&R (Hong Kong) Limited) is associated with the aftercare of the closed Gin Drinker Bay Landfill (i.e. the existing Kwai Chung Park), which is partially encroached into the Project Area. Based on the site walkover, the encroached portion of the site comprises of vegetated land and slope only and no chemical waste storages / stains or spillage were observed (refer to Photo 9148 in PR10 of Appendix 7.3). Therefore, potential land contamination issue associated with this CWP record to the Project is not anticipated.

7.5.5.12 CWP ID 9 (Director of Civil Engineering) is associated with material testing in the Public Works Regional Laboratory (Tsuen Wan), which is partially encroached into the Project Area. As discussed in Section 7.5.2.4, potential land contamination issue associated with the former operation / chemical waste storage at this Laboratory Site to the Project is not anticipated.

7.5.5.13 CWP ID 10 (Peako Engineering Co. Limited) is associated with the current construction site for construction of the Flyover from KTI upramp to KCR, which is partially encroached within the southern end of the Project Area. As observed during the site walkover, no chemical waste storages / signs of stains or spillage were observed within the encroached portion of the construction site (refer to Photo 8675 in PR11 of Appendix 7.3). Therefore, the storage of chemical waste associated with this CWP record is unlikely to have caused any land contamination issues to the Project Area.

7.5.5.14 CWP ID 11 (Arbat Construction Company Limited) is likely to be associated with water works under completed WSD Contract No. 25/WSD/09 Replacement and Rehabilitation of Water Mains Stage 3 - Mains in Tsuen Wan and Kwai Tsing[5]. The exact location of this CWP could not be identified based on the available address. As there were no relevant construction sites observed within the Project Area during the site walkover, and there were no signs of stains / chemical waste storage / spillage observed at these locations during the site walkover, the storage of chemical wastes, if any, associated with this CWP record is unlikely to have caused any land contamination issues to the Project.

7.5.5.15 CWP ID 12 (Ming Hing Waterworks Engineering Co. Ltd) is likely to be associated with water works under completed WSD Term Contract No. 1/WSD/15(W) and ongoing WSD Term Contract No. 1/WSD/18(W)[6]. The exact location of this CWP could not be identified based on the available address. As there were no relevant construction sites observed within the Project Area during the site walkover, and there were no signs of stains / chemical waste storage / spillage observed at these locations during the site walkover, the storage of chemical wastes, if any, associated with this CWP record is unlikely to have caused any land contamination issues to the Project.

7.5.5.16 CWP ID 13 (Water Supplies Dept - New Territories West) is likely to be associated with the existing Tsuen Wan Salt Water Pumping Station near Hoi Hing Road. Given the pumping station is located outside the Project Area, the storage of chemical waste associated with this CWP record is unlikely to have caused any land contamination issues to the Project Area.

7.5.5.17 CWP ID 14 (China Geo-engineering Corporation) is associated with sewage works at Hoi Shing Road in the north of the Project Area. The works is completed as the CWP record is invalid. Based on the site walkover, the site is currently an open car park (STT1554TW) (refer to Photo 4425 in PR1 of Appendix 7.3). No relevant construction sites / chemical waste storages / stains or spillage were observed at this site during the site walkover. Given the sewage works is completed and no relevant construction sites / chemical waste storages / stains or spillage were observed, the storage of chemical wastes associated with this CWP record was unlikely to have caused any land contamination issue to the Project.

7.5.5.18 CWP ID 15 (Barbican Construction Co. LTD) is associated with the former site office for road works near Hoi Kok Street within the Project Area. Based on the site walkover, the site is currently an open car park (STT1503TW) (refer to Photo 4440 in PR2 of Appendix 7.3). No relevant construction sites /chemical waste storages / stains or spillage were observed at this site during the site walkover. Given the road works is completed and no relevant construction sites / chemical waste storages / stains or spillage were observed, the storage of chemical wastes associated with this CWP record was unlikely to have caused any land contamination issue to the Project.

7.5.5.19 CWP ID 16 (Lam Construction CO., LTD) is associated with electrical installation within the existing Tsuen Wan South Substation in the central portion of the Project Area. The works is completed as the CWP record is invalid. Given the substation will be retained under the Project (refer to Section 7.4.1.3), potential land contamination issue associated with this CWP record to the Project is not anticipated.

7.5.5.20 CWP ID 17 (Leader Civil Engineering Corporation Limited) is associated with the retrofitting of noise barrier at Tsing Tsuen Road in the centre of the Project Area. The works is completed as the CWP record is invalid and no relevant construction sites / chemical waste storages were observed within the Project Area during the site walkover (refer to Photo 1101 & 1103 in PR8 of Appendix 7.3). Given the nature of the construction works and no relevant construction sites / chemical waste storages / stains or spillage were observed during the site walkover, the storage of chemical wastes associated with this CWP record was unlikely to have caused any land contamination issues to the Project Area.

7.5.5.21 CWP ID 19 (China State Construction Engineering (Hong Kong) Limited) is likely to be associated with former construction works at Wing Tak Street / Texaco Road underneath the existing TWR in the centre of the Project Area. The works is completed as the CWP record is invalid and no relevant construction sites / chemical waste storages were observed at this site during the site walkover (refer to PR6 of Appendix 7.3). Given the construction works is completed and no relevant construction sites / chemical waste storages / stains or spillage were observed, the storage of chemical wastes, if any, associated with this CWP record was unlikely to have caused any land contamination issues to the Project.

7.5.5.22 Based on the above, no potential land contamination implications associated with the identified CWP records are anticipated for the Project.

Fire Services Department

7.5.5.23 Based on the replies from FSD on 20 August 2020, 5 October and 15 November 2021, a number of DG stores were identified at the industrial facilities/buildings located in the vicinity of the Project Area. Details of the licenses are summarised in Table 7.3 below and the locations of the DG stores are shown in Figure 7.10. As the DG stores were outside of the Project Area, the storage of DG was not expected to pose any potential land contamination issues to the Project.

Table 7.3 Summary of Dangerous Goods License information

Store Location	Type of DG
6/F, Tsuen Wan Industrial Centre, Texaco Road, Tsuen Wan	Cat. 2
TW5 Bayside Property Development Tsuen Wan Town Lot No. 401	Cat. 5
6/F & 7/F, No. 35 Wing Kei Road, Kwai Chung	Cat. 2
No. 252 Texaco Road	Cat. 5
4/F, Tsuen Wan Industrial Centre, 220-248 Texaco Road, Tsuen Wan	Cat .3, 4 and 7

7.5.5.24 Furthermore, 19 incident records were reported by the FSD. The details of the incident records are summarized in Table 7.4 and the locations of the incident occurrences were shown in Figure 7.10.

Table 7.4 Summary of Incident Records

Address / Lamp Post No.	Date	Types of Incident
Roadside near Lamp Post No. FC0347 of Tsuen Wan Road	16 February 2017	Rubbish Fire
Flower bed underneath Tsuen Wan Road near Lamp Post No. FC0475	27 May 2017	No.1 Fire Alarm
LP FC4667 Kwai Hei Street	26 October 2018	No.1 Fire Alarm
LP FA9721 near Kwai Fuk Road	27 October 2018	Rubbish Fire
LP FC4667 near Kwai Hei Street	1 March 2019	Rubbish Fire
LP FC4667 near Tsuen Wan Road	2 November 2019	No.1 Fire Alarm
LP FC0358 of Tsuen Wan Road	2 November 2019	No.1 Fire Alarm
LP FC0557 near Hing Fong Road	26 December 2019	Late Call
LP GC1230 near Kwai Hei Street	12 December 2020	Rubbish Fire
LP FC0478 near Tsuen Wan Road	5 June 2020	Rubbish Fire
93 Kwai Fuk Road, Citic Telecom Tower	20 June 2020	Vehicle Fire
LP BC2637 Junction of Hing Fong Road and Tsuen Wan Road	21 July 2020	Rubbish Fire
LP FC1383 Roadside Container Port Road	2 December 2020	Vehicle Fire
LP FC0450 Chun Shing Factory Estate	18 December 2020	Vegetation Fire
LP FC0440 near Tsing Tsuen Road	29 December 2020	Vegetation Fire
LP FA5247 near Tsing Tsuen Road	10 April 2021	Vegetation Fire
LP FA5301 near Tsing Tsuen Road	8 May 2021	Vegetation Fire
LP FA5301 near Tsing Tsuen Road	12 May 2021	Rubbish Fire
LP W4953 near Tsuen Tsing Interchange	30 May 2021	Vehicle Fire

7.5.5.25 Among the 19 incident records, 3 incident locations (Lamp Post FA9721 near Kwai Fuk Road, Lamp Post FC4667 near Kwai Hei Street and Lamp Post FA5247 near Tsing Tsuen Road) are outside of the Project Area. Thus, these incidents are not expected to pose any potential land contamination issues to the Project.

7.5.5.26 For the remaining 16 incident records, given that no stains, burn marks or stressed vegetation were observed at these locations during the site walkover, these incidents were thus not expected to pose any potential land contamination issues to the Project.

7.5.6 Site Reconnaissance

7.5.6.1 Site walkovers were conducted on 16 November and 22 December 2021 to investigate any contaminative issues associated with current land uses and activities within the Project Area. Findings of the site walkover, including the photographic records and site layout plan, are shown in Appendix 7.3. Questionnaires were conducted with available site representatives and the site walkover checklists are provided in Appendix 7.4.

7.5.6.2 Based on the site walkover, the Project Area was mainly occupied by non-contaminating land uses including roads (e.g. the existing TWR, TTI, Container Port Road, Hoi Hing Road, Hoi Kok Street, Hoi On Road, Kwai Hei Street, Kwai Tsing Road, Lung Tak Street, Tai Chung Road, Tai Ho Road, Texaco Road, Tsing Tsuen Road, Wing Shun Street and Wing Tak Street), open car parks (STT1503TW, STT1514TW, STT1517TW, STT1518TW, STT1521TW, STT1527TW and STT1570TW), garden / parks / playground (e.g. Tsuen Wan Park, Hoi Shing Garden and Kwai Shun Street Playground), basketball court, refuse collection points (Hoi Shing Road and Kwai Shun Street Refuse Collection Point), Tsuen Wan Driving Test Centre, Kwai Shun Street Cooked Food Market, public toilet, vegetated land, slope, vacant land, cycling track, footpaths and footbridges (refer to PR1 to PR11 in Appendix 7.3 and Appendix 7.4-1). No potentially contaminating land uses / activities (e.g. vehicle maintenance) were observed in these areas during the site walkover.

7.5.6.3 The Project Area includes the existing Kwai Chung Park (the former Gin Drinkers Bay Landfill). Based on the site walkover, the encroached portion and nearby area of the Kwai Chung Park comprises of vegetated land and slope only and no chemical waste storages / stains or spillage were observed. Therefore, no potential land contamination issue at the existing Kwai Chung Park is anticipated. Findings of the site walkover are summarized in Table 7.5. The corresponding photographic records are shown in PR10 of Appendix 7.3.

7.5.6.4 The Project Area also includes the Drainage Services Department (DSD) Maintenance Depot at Hoi Kok Street under Contract No. DC/2019/02 and the LandsD Site Depot at Wing Tak Street under Contract No. 10/LANDS/19. Although potential land contamination issues were identified within these 2 site depots, according to the latest engineering design, no excavation works are proposed within the DSD maintenance depot and the concerned hotspot areas identified at the LandsD Site Depot are outside the proposed excavation areas (for the proposed piers) under the Project. The distances of the identified hotspot areas at DSD maintenance depot and LandsD Site Depot are at least 15 m and 9m respectively from the proposed excavation boundaries. Therefore, potential land contamination issues associated with operation of these two sites to the Project are not anticipated. Findings of the site walkover are summarized in Table 7.5. Questionnaires were conducted with available site representatives and the site walkover checklists are provided in Appendix 7.4-2 and Appendix 7.4-3. The corresponding photographic records are shown in PR12 to PR14 of Appendix 7.3.

7.5.6.5 No potential off-site sources of contamination were observed adjacent to the proposed road alignment or in the vicinity of the excavation area.

Potentially Contaminated Site (Affected Land Lot No. / Address)	Current Land Use	Site Observation / Current Potentially Contaminating Activities	Corresponding Photographic Record Reference in Appendix 7.3	Other Past Potential Contaminating Land Use / Activities	Approx. Site Area (m²)	Any Potential Land Contamination Issue?
DSD Maintenance Depot (GLA-TTW 878 / 3 Hoi Kok Street)	Site office and maintenance depot	A maintenance depot under Contract No. DC/2019/02 Drainage Maintenance and Construction in Mainland South Districts is located at Hoi Kok Street in the north of the Project Area, which is currently operated by the DSD and Welcome Construction Company Limited (contractor). The site mainly comprises a car park in the north, site offices in the south, a material storage area for construction materials and equipment in the west, a works area for Cured-in-Place-Pipe (CIPP) liner production in the east and access road in the remaining areas of the site. The entire site is concrete paved. Based on site observations and as reported by the site representative, no vehicle / equipment maintenance activities are carried out on site. The works area mainly consists of a workshop area, a storage area for the CIPP liners, chemical / chemical waste storage areas, 3 refrigerated containers for the storage of resin solutions and curing agents, a resin mixing area and a forklift refueling area. Based on site observations and information provided by the site representatives, chemicals including cement mortars, resin solution (containing styrene), styrene monomer (resin thinners) and curing agent are used for CIPP liner production in the works area. In addition, diesel is reportedly used for operation of the forklift and motor oil is used for operation of the blowers in the workshop area. A motor oil barrel, resin solutions, styrene monomer containers and spent diesel oil drums were observed in the southeastern corner of the site. The styrene monomer and diesel oil drums were stored directly on concrete paved ground and the resin solutions were stored in drums on wooden pallets with no signs of stains / spillage observed in the vicinity. The motor oil barrel was stored on a metal rack with stain / spillage observed underneath the barrel. Waste batteries were also observed in the workshop area, which were stored on wooden pallets on concrete paved floor with no signs of stains / spillage observed in the vicinity. The resin mixing and forklift refueling areas were concrete paved with some stains observed. Based on EPD information, 1 valid CWP record registered for construction was identified for the site and the registered chemical wastes included spent motor oil, spent diesel oil and waste battery. Based on information from FSD, EPD and site representatives, there were no DG / fire incident / chemical spillage records for the site.	PR12 to PR13	N/A	4,730	No According to the latest engineering design, no excavation works within the DSD Maintenance Depot is proposed under the Project. The concerned hotspot areas are located outside the proposed excavation areas (for the proposed piers) under the Project for at least 15 m.
LandsD Site Depot (GLA-TTW 876 / Wing Tak Street)	Construction site depot	A construction site depot under Contract No. 10/LANDS/19 Slope Improvement and Emergency Works over Hong Kong Island and Islands, Kowloon, Sai Kung, Tsuen Wan and Kwai Tsing Districts is located at Wing Tak Street in the centre of the Project Area, which is currently operated by the LandsD and DIX Construction and Transportation Limited (contractor). Based on the latest engineering design, excavation within the site under the Project would only be required for the construction of the proposed piers (refer to PR14 in Appendix 7.3 for the proposed excavation areas). The site depot mainly comprises a construction material storage area in the north and west, site offices in the east and northeast, a temporary storage area for construction waste in the southwest, a chemical storage area in the south and open area in the centre of the site. The entire site is concrete paved. According to the site representatives, no vehicle / equipment maintenance takes place on site. As observed during the site walkover, chemicals including lubricating oil, paints and thinners were identified on site. Two lubricating oil drums were observed in the northeast of the site, which were stored directly on concrete paved floor with oil stains observed in the vicinity. According to the site representatives, lubricating oil is stored on site and is only used for construction works off-site. Paints and thinners were observed in the chemical storage area in the southeast of the site, which were stored on shelves or directly on concrete paved ground. However, all the identified chemicals / oil stains were located outside the proposed excavation areas under the Project. Based on FSD/EPD information, there were no DG / chemical wastes / fire incident / spillage records for the site.	PR14	N/A	1,150 Lubricating Oil Storage Area and Oil Stain: 2 m² Chemical Storage Area: 1 m²	No The concerned hotspot areas are located outside the proposed excavation areas (for the proposed piers) under the Project for at least 9 m. The proposed excavation areas have been used for construction materials storage only with no oil stains / potential land contamination issues identified.
Kwai Chung Park (GLA-TKT 1704)	Park	The existing Kwai Chung Park is located in the south of the Project Area. As observed during the site walkover, the encroached portion and nearby area of the site comprises of vegetated land and slope only and no chemical waste storages / stains or spillage were observed. Based on EPD information, 1 valid CWP record registered for aftercare of the closed Gin Drinkers Bay Landfill was identified for the site. However, no chemical waste storages / stains or spillage were observed within encroached portion of the site during site walkover. Based on information from FSD and EPD, there were no DG / fire incident / chemical spillage records for the site.	PR10	Landfill (Gin Drinkers Bay Landfill)	270,000 (Encroached Area: 17,660)	No Filling and placement of cover soils were completed during the restoration of Gin Drinkers Bay Landfill / development of existing Kwai Chung Park in 1980-90s, only shallow excavation would be anticipated for the encroached portion of the site which would not encroach into / penetrate the cover soil / capping layer of the landfill, and no potential land contamination issues were identified in the existing Kwai Chung Park based on the site walkover.