Report

· Annex 19 of the Technical Memorandum for Environmental Impact Assessment Ordinance (TM-EIAO), Guidelines for Assessment of Impact On Sites of Cultural Heritage and Other Impacts (Section 3 – Potential Contaminated Land Issues), EPD, 1997;

· Guidance Manual for Use of Risk-Based Remediation Goals (RBRGs) for Contaminated Land Management, EPD, 2007.

· Guidance Notes for Contaminated Land Assessment and Remediation, EPD, 2007; and

· Practice Guide for Investigation and Remediation of Contaminated Land, EPD, 2011;

8.1.1.2 In accordance with EPD’s Guidance Note for Contaminated Land Assessment and Remediation, a contamination assessment evaluation should:

· provide a clear and detailed account of the present use of the land and the relevant past land history, in relation to possible land contamination;

· identify areas of potential contamination and associated impacts, risks or hazards; and

· submit a plan to evaluate the actual contamination conditions for soil and/or groundwater, if required.

8.1.1.3 The EPD’s Guidance Notes include a summary of the general steps of a detail contamination assessment study.

8.1.1.4 Under the Annex 19 of the TM-EIAO, consideration shall be given to a number of historical land uses which have the potential to cause or have caused land contamination, including oil installations, gas works, metal workshops, car repair and dismantling workshops, as having the potential to cause or have caused land contamination.

8.2 Baseline Conditions

8.2.1 Review of Historical Land Use

8.2.1.1 Selected aerial photographs between Year 1973 and 2012 have been reviewed to identify any past and present land use, activities and installation within the PDAs at TCE and TCW and at the works areas for the associated infrastructures outside the PDAs that may have potential for causing land contamination. The historical aerial photos reviewed for the PDAs and works areas for the associated infrastructures are shown in Appendices A and B of Appendix 8.1 respectively. Summary of the development history of the PDAs and the associated infrastructures are given below.

Table 8.1 Historical land use of the PDAs at TCE and TCW

Year	Descriptions
1973	TCE In Year 1973, the PDA at TCE was located in open sea. TCW In Year 1973, Tung Chung Valley was dominated by agricultural land use. Village-type residential areas can be observed in Tung Chung Valley and Ma Wan Chung. Road networks can be observed in the area.
1982	TCE Same as that in Year 1973. TCW In Year 1982, development of the Tung Chung playground appeared to be underway in Sha Tsui Tau. No observable changes to the village-type residential areas in Tung Chung Valley and Ma Wan Chung. A distinct road network nearby can be observed including Tung Chung Road and Chung Yan Road.
1993	TCE Same as that in Year 1982. TCW In Year 1993, areas where used to be agricultural land became grass land and hardly any agricultural land can be observed in the area. The village-type residential areas in Tung Chung Valley and Ma Wan Chung remained.
2004	TCE Same as that in Year 1993. TCW In Year 2004, Tung Chung playground had been completed in Sha Tsui Tau. The channel adjacent to Sha Tsui Tau was straightened. Tung Chung Valley was dominated by natural terrain and no agricultural land can be observed in the area. Development of the Yat Tung Estate, schools (TMCA of Hong Kong Christian College and Cantas Charles Vath College) and highway infrastructure adjacent to the development area in Tung Chung East can be observed. The village-type residential areas in Tung Chung Valley and Ma Wan Chung remained unchanged.
2012	TCE Same as that in Year 2004. TCW In Year 2012, the open area adjacent to Tung Chung playground in Sha Tsui Tau was widened and temporary structures were installed in the site. Some vegetated areas west of Shek Lau Po were cleared and became open area or agricultural fields. Temporary structures were also observed in some cleared site. For the remaining areas no considerable changes in land use were observed.

Table 8.2 Historical land use of the works area for the associated infrastructures

Year	Descriptions
1973	TCE The petrol filling station, works area for Road P1 (Tung Chung – Tai Ho Section), the proposed rising mains and the tentative cycle track network were in open sea. TCW The proposed rising mains and the tentative cycle track network, the works areas for the service reservoirs and upgrading works of Chung Mun Road SPS were in agricultural land and/or natural terrain.
1982	TCE Same as that in Year 1973. TCW Same as that in Year 1973.
1993	TCE The petrol filling station, works area for Road P1 (Tung Chung – Tai Ho Section), the tentative cycle track network and most of the area for the proposed rising main were in open sea apart from the eastern end where reclamation was on-going. TCW Reclamation was on-going at the eastern portion of the proposed rising main. The rest of the proposed rising mains and the tentative cycle track network, the works areas for the service reservoirs and upgrading works of Chung Mun Road SPS were in grassland and/or natural terrain.
2004	TCE The petrol filling station laid along the existing seawall. The works area for Road P1 (Tung Chung – Tai Ho Section) were along the North Lantau Highway. The proposed rising mains and part of the tentative cycle track network ran along both the North Lantau Highway and the access road adjacent the Siu Ho Wan Depot. Most of the sections of the tentative cycle track network were in open sea. The eastern end of the proposed rising main ran across the North Lantau Highway, passed between the vacant land between Discovery Bay Tunnel Toll Plaza and the New Lantau Bus Depot and entered the SHW WTW. The southwest section of the tentative cycle track network outside PDA at TCE laid on the newly reclaimed land. TCW The proposed rising main ran along Chung Mun Road, Yu Tung Road, down Shung Tung Road then ended at the MTR Tung Chung station. Part of the rising main branched off at Yu Tung Road and ran along the open area outside Yat Tung Estate. The sections of the tentative cycle track network outside PDA at TCW ran along Chung Yan Road and Chung Mun Road on the newly reclaimed land. The works area for the upgrading of Chung Mun Road SPS was vegetated area and the works area for service reservoir partly encroached into the Tung Chung Fresh Water Service Reservoir and partly into natural terrain.
2012	TCE Same as that in 2004. TCW Same as that in 2004.

8.2.2 Site Geology

8.2.2.1 The onshore superficial deposits adjacent to the TCE and Road P1 (Tung Chung – Tai Ho Section) area typically consist of reclamation fill, underlain by alluvial deposits. In closer proximity to the natural terrain located to the south, colluvial deposits of sand, gravel, cobbles, and boulders in a clay/silt/sand matrix are also expected. In the region of Tai Ho Wan, Quaternary beach deposits have also been identified.

8.2.2.2 The superficial deposits in the offshore area surrounding the proposed site typically vary between 10m and 150m in thickness, and consist of marine deposits of clay, silt and sand; overlying alluvial deposits of clay, silt, sand, and gravel. The solid geology underlying the site comprises a series of fault bounded blocks of volcanic rocks of predominantly rhyolite lava and tuff, alongside sedimentary and intrusive rocks of predominantly granite and rhyolite dykes. The offshore area fall within the Designated Area of Northern Lantau, which is identified as having potential for complex geological conditions where there is potential for the presence of marble within the designated area, and associated depressions in the rock head due to dissolution features.

8.2.2.3 The onshore area in TCW is characterised by the low lying alluvial plains at the south of Tung Chung Wan and the surrounding mountainous terrain. The terrain is dissected by deep drainage and storm channels. Many of these channels are associated with colluviums and other landslide features. The bedrock is dominated by Mesozoic volcanic rocks (rhyolite lava and tuff) and younger intrusive granitoid intrusive rocks, particularly feldsparphyric rhyolite.

8.2.2.4 Superficial deposits comprise alluvium and colluviums. Extensive alluvial deposits are present around Tung Chung. Colluvium occurs most commonly as ribbon-like deposits infilling draining courses. Large deposits with a general thickness of 10 meters occur on the west facing slopes of the Tung Chung Valley.

8.2.3 Site Survey

8.2.3.1 Site survey for the PDAs at TCE and TCW was conducted in November 2012 as part of the land contamination assessment presented in the previously approved CAP.

8.2.3.2 Since a new EIA Study Brief (EIA Study Brief No. ESB-285/2015) was issued in April 2015 with the addition of the associated infrastructures, site survey was conducted in late April 2015 in the PDAs and works areas for the associated infrastructures with objectives 1) to verify findings in the previously approved CAP for the PDAs, 2) to ground truth findings of the desktop study and to identify any other land uses within the works areas for the associated infrastructures which may have the potential for causing soil and groundwater contamination. The survey confirmed that the findings in the previously approved CAP are still valid and a summary is given below:

PDA at TCE

8.2.3.3 The PDA at TCE is currently in open sea. No land contamination issue is anticipated in this area.

PDA at TCW

8.2.3.4 The PDA at TCW mainly consisted of natural terrain and village-type residential areas which are found in Ngau Au, Tung Hing, Lam Che, Mo Ka, Shek Lau Po, Shek Mun Kap, and Ma Wan Chung. Small scale agricultural land uses are also observed in the villages. A few open areas were found west of Shek Lau Po but no activities or structures were observed in these open areas.

8.2.3.5 A total of 13 surveyed sites (TC-1 to TC-13) have been identified during the site survey. Locations of the surveyed sites are given in Figure 8.1. It should be noted that owing to access limitation, only peripheral inspection (i.e. conducted from the entrance and/or boundary of the sites) was conducted for TC-1, TC-3, TC-8, TC-9, TC-10, and TC-11. Observations for each site are summarised in Table 8.3. Detailed information and photo records for each individual site are presented in the CAP agreed by EPD on 31 July 2015 under the new EIA Study Brief (EIA Study Brief No. ESB-285/2015) (see Appendix 8.1).

Table 8.3 Summary of surveyed sites in the PDA at TCW

Site ID	Locations	Current Status	Approximate Area (m²)	Observations/ Remarks ^[1]
TC-1	At the junction between Chui Kwan Drive and Yat Tung Street	Storage area for recycling materials	1,541	A paved storage area for recycling materials including waste metal cans and electrical appliances. Electrical parts were identified suggesting possible dismantling activities within the site.
TC-2	On-shore area in front of Luk Yat House	Abandoned containers	1,733	No land contaminating activities were observed during the site visit. No contaminated land impacts were identified during the site survey.
TC-3	West of Chung Mun Road	Open storage	882	Site access limited. Few paint containers were observed from the entrance. The site was paved and no oil stain or sign of paint leakage were observed. No fuel storage/ transfer and no maintenance of equipment/ vehicles were observed.
TC-4	Adjacent to Chung Mun Road	Petrol filling activities	297	Paved area. Two temporary structures were installed. It appears that one of the temporary structures was used as office whilst the other one was used for storing fuel drums. Slight oil stain was observed at the temporary structure used for storing fuel drums
TC-5	Shek Lau Po	Open storage	2,823	Paved area with aggregates stored in one side of the site. No land contaminating activities were observed during the survey. No adverse contaminated land impacts were identified during the site survey.
TC-6	Shek Lau Po	Open storage	2,059	Paved area for storing construction materials (mainly aggregates), No adverse contaminated land impacts were identified during the site survey.
TC-7	Shek Lau Po	Open area with car parking	1,959	A temporary structure was installed on the north side of the site. Other temporary structures as seen in the 2012 aerial photos have been demolished. A few light vehicles were parked in the site. No fuel filling and car repairing activities were observed. No contaminated land impacts were identified during the site survey.
TC-8	Shek Lau Po	Open storage	402	Site access limited. Construction site equipments were stored in the site.
TC-9	Shek Lau Po	Car repairing workshop	702	Site access limited. The site was paved and light vehicles were parked in the site. No oil stain was observed in the site.
TC-10	Shek Lau Po	Car repairing workshop	348	Site access limited. The site was paved and no oil stain was observed in the site.
TC-11	Near Fong Yuen	Open storage	6,634	Site access limited. Heavy vehicles and storage of construction materials and containers could be observed.
TC-12	Sha Tsui Tau	Abandoned yard	7,408	No apparent activities in the site were observed. Temporary structures and piles of abandoned materials (i.e. unused furniture) were found in the site. No scrap vehicle, scrap transformers, scrap metals, or vehicle/ equipment maintenance and refuelling activities were observed on site.
TC-13	Shek Lau Po	Temporary structures with light vehicles parked	566	Temporary structures were found in the site. Light vehicles were parked on paved ground. No oil stain and other land contaminating activities were observed.

Note:

[1] The preliminary observation is subject to review and further justification after land resumption.

8.2.3.6 For the associated infrastructures, findings of the site survey showed that there has been no significant changes in the land use at the proposed works areas since Year 2012. The findings are summarised as follows and the photo records for the survey are presented in Figures 2.2 – 2.8 of Appendix 8.1.

Works Areas for the Associated Infrastructures at TCE

8.2.3.7 The proposed petrol filling station is located on the existing seawall adjacent to the existing reclaimed land and it is currently occupied by rocks and boulders.

8.2.3.8 The proposed alignment of the rising main runs along both the North Lantau Highway and the access road adjacent Siu Ho Wan Depot. The eastern end of the proposed rising main run across the North Lantau Highway, passes through the open area between the Discovery Bay Tunnel Toll Plaza and the New Lantau Bus Depot and enter the SHW STW (since access is only permitted along Cheung Tung Road, and there has been no significant changes in the land use at the New Lantau Bus Depot and the SHW STW since Year 2012, photo record of this area refers to aerial photo of 2012a in Appendix B of Appendix 8.1).

8.2.3.9 The section of the tentative cycle track network outside the PDA at TCE runs within the existing construction sites for Area 55a and Area 56. Peripheral observation was conducted outside construction site during the site visit.

8.2.3.10 The proposed works area for Road P1 (Tung Chung – Tai Ho Section runs along the North Lantau Highway (since there is no pedestrian access along the highway, and there has been no significant changes in the land use of this highway since 2012, photo record of this area refers to aerial photo 2012b & c in Appendix B of Appendix 8.1).

Works Areas for the Associated Infrastructures at TCW

8.2.3.11 The proposed rising main runs along Tat Tung Road, then turn into Shun Tung Road, Yu Tung Road and Chung Mun Road. Part of the rising main branches off at Yu Tung Road and runs along the open area outside Yat Tung Estate.

8.2.3.12 The section of the tentative cycle track network outside the PDA at TCW runs along Chung Yan Road to the east of Yat Tung Estate and the short section of Tung Chung Road to the east of Caritas Charles Vath College. All of them lies along existing road networks.

8.2.3.13 The works area for the service reservoir was in natural terrain. The works area for the proposed upgrading of Chung Mun Road SPS is currently vegetated area.

8.2.4 Future Land Use and Activities

8.2.4.1 The relevant Risk-Based Remediation Goals (RBRGs) would be adopted for the land contamination assessment. Four different post-restoration land uses have been developed for the RBRGs, namely “Urban Residential”, “Rural Residential”, “Industrial” and “Public Parks”, to reflect the actual settings which people could be exposed to contaminated soil or groundwater. Definition of post-restoration land uses are given in EPD’s Guidance Note for Contaminated Land Assessment and Remediation and Guidance Manual for Use of Risk-Based Remediation Goals (RBRGs) for Contaminated Land Management.

8.2.4.2 As the future land uses of the PDAs are yet to be confirmed in the on-going planning exercise, the most relevant RBRGs corresponding to its future land use would be adopted in the land contamination assessment. Nevertheless, if the future land uses still could not be confirmed or in doubt during the assessment (i.e. interpretation of the soil and groundwater testing results), the most stringent set of RBRGs would be adopted.

8.2.4.3 On the other hand, the future land uses of the associated infrastructures are road and public utilities. According to EPD’s Guidance Note for Contaminated Land Assessment and Remediation and Guidance Manual for Use of Risk-Based Remediation Goals (RBRGs) for Contaminated Land Management, the corresponding RBRGs land use will be “Lower of Industrial or Public Park” and “Industrial” respectively. The land contamination assessment will be conducted based on this land use classification.

8.3 Potentially Contaminated Sites

8.3.1 Identification of Potentially Contaminated Sites

8.3.1.1 Identification of potentially contaminated sites within the PDAs and works areas for the associated infrastructures at TCE and TCW has been done based on the criteria stipulated in EPD’s Practice Guide for Investigation and Remediation of Contaminated Land. Information collected from desktop review of selected historical aerial photos and from site survey has also been used to assist the task.

8.3.1.2 The PDA at TCE is currently located in open sea, while no land contaminating activities are identified in the works areas for the associated infrastructures including petrol filling station, Road P1 (Tung Chung – Tai Ho Section), service reservoirs, upgrading works for Chung Mun Road SPS, existing rising mains/ sewers require upgrading/ proposed rising main and the section of tentative cycle track network outside the PDA at TCW. For the section of tentative cycle track network outside the PDA at TCE which runs within the existing construction sites for Area 55a and Area 56, considered that “construction site” itself is not classified as contaminated land use type according to the Practice Guide for Investigation and Remediation of Contaminated Land, usual construction activities will not lead to potential land contamination and good site practices should have been implemented within the construction sites to minimise pollution or comply with relevant legislations, land contamination impact is not anticipated in these areas.

8.3.1.3 Four potentially contaminated sites have been identified within the PDA at TCW and details of the potentially contaminated sites identified in the PDA at TCW are given in the subsections below.

8.3.2 Sites Requiring Further Site Investigation

8.3.2.1 Among all the surveyed sites, TC-1 (storage area for recycling materials) and TC-4 (site with petrol filling activities) were identified as potentially contaminated and require further site investigation (SI). For TC-9 and TC-10 which are both car repairing workshops, although no sign of land contamination issues have been identified through peripheral inspection, considering the duration of their operations are more than 3 years (TC-9 and TC-10 already present in the aerial photos in Year 2012), further site investigation is recommended as a conservative approach.

8.3.2.2 Details of TC-1, TC-4, TC-9 and TC-10 have been summarised in Table 8.4. SI (i.e. borehole drilling, and soil and groundwater sampling and testing) is recommended to be carried out. The locations of these potentially contaminated sites are overlaid onto the RODP and shown in Figure 8.2.

Table 8.4 Summary of the potentially contaminated sites

Site ID	Locations	Current Status	Approximate Area (m²)	Observations/ Remarks ^[1]
TC-1	At the junction between Chui Kwan Drive and Yat Tung Street	Storage area for recycling materials	1,541	A paved storage area for recycling materials including waste metal cans and electrical appliances. Electrical parts were identified suggesting possible dismantling activities within the site.
TC-4	Adjacent to Chung Mun Road	Petrol filling activities	297	Paved area. Two temporary structures were installed. It appears that one of the temporary structures was used as office whilst the other one was used for storing fuel drums. Slight oil stain was observed at the temporary structure used for storing fuel drums
TC-9 ^[2]	Shek Lau Po	Car repairing workshop	702	Site access limited. The site was paved and light vehicles were parked in the site. No oil stain was observed in the site.
TC-10 ^[2]	Shek Lau Po	Car repairing workshop	348	Site access limited. The site was paved and no oil stain was observed in the site.

Notes:

[1] The preliminary observation is subject to review and further justification after land resumption.

[2] Although no sign of land contamination issues have been identified at TC-9 and TC-10 through peripheral inspection, considering the duration of their operations are more than 3 years (TC-9 and TC-10 already present in the aerial photos in year 2012), further site investigation is recommended as a conservative approach.

8.3.3 Re-appraisal of the Surveyed Sites

8.3.3.1 Although other surveyed sites have not been identified as potentially contaminated sites based on the observation during the site survey, development of these sites would only commence a number of years later. This may result in changes in the land usage of these sites which may lead to potential land contamination issues. As such, re-appraisal would be required to assess the latest site situation by the Project Proponent (PP) before the implement any development. The objective of the re-appraisal is to ensure any new change in land use that involves potentially contaminating activities after the approval of the CAP but before commencement of the development could be addressed.

8.3.3.2 Focus of the re-appraisal will be put on the 3 surveyed sites (i.e. TC-3, TC-8 and TC-11), where access was limited at this stage, to ascertain any physical clues of land contamination. Particular attention will be given to open storage TC-3.

8.3.4 Re-appraisal of the Remaining Areas in the PDAs and Works Areas for the Associated Infrastructures

8.3.4.1 Apart from the surveyed sites, the remaining areas of the PDAs and the works areas for the associated infrastructures should also be re-appraised once the future development of these areas is confirmed and the land is resumed by the PP. The objective of re-appraising these remaining areas is to ensure any new change of land use, which may give rise to potential land contamination issues, occur after the approval of CAP but before the commencement of the development could be addressed.

8.4 Site Investigation

8.4.1 Proposed Site Investigation for Potentially Contaminated Sites

8.4.1.1 As discussed in Section 8.3, TC-1, TC-4, TC-9 and TC-10 have been identified as potentially contaminated sites. SI is recommended to be carried out to determine the types and quantities of contaminants within the sites. The numbers of SI boreholes required for each of the sites have been determined based on the recommendations given in Table 2.1 in EPD’s Practice Guide for Investigation and Remediation of Contaminated Land and summarised in Table 8.5. The tentative locations of the proposed boreholes are given in Table 8.6 and shown in Figures 8.3 – 8.6.

Table 8.5 Number of boreholes proposed for the potentially contaminated sites

Site ID	Area of Site (m²)	Square Grid Size (m)	Proposed Numbers of Borehole	Proposed Landuse in RODP ^[2]
TC-1	1,541	13	9	GIC
TC-4 ^[1]	10	-	1	R
TC-9	702	13	5	Road Network & AGR
TC-10	348	13	3	R

Notes:

[1] Although the whole area of TC-4 is 297m², SI is only proposed to cover the fuel storage area which is approx. 10m², hence only 1 borehole is proposed.

[2] Relevant RBRGs corresponding to the proposed land uses shown in this RODP have been adopted in the land contamination assessment for the purpose of EIA.

Table 8.6 Proposed soil and groundwater sampling locations

Site ID	Borehole No.	Potentially Contaminated Area	Coordinates
Site ID	Borehole No.	Potentially Contaminated Area	Easting	Northing
TC1	TC1-1	Storage area for recycling materials	811636.6	816040.2
	TC1-2		811645.6	816047.4
	TC1-3		811654.5	816054.6
	TC1-4		811645.8	816028.1
	TC1-5		811645.2	816033.6
	TC1-6		811662.8	816039.4
	TC1-7		811654.9	816015.9
	TC1-8		811662.2	816021.5
	TC1-9		811669.5	816027.0
TC-4	TC4-1	Fuel storage area	810963.0	815359.6
TC-9	TC9-1	Car repairing workshop	811002.8	815003.1
	TC9-2		811006.6	814993.3
	TC9-3		811017.9	814994.1
	TC9-4		811030.5	814994.1
	TC9-5		811040.9	814994.1
TC-10	TC10-1	Car repairing workshop	811026.9	814982.9
	TC10-2		811036.1	814982.9
	TC10-3		811045.1	814982.9

8.4.1.2 However, since all the 4 potentially contaminated sites are located in private land lot, SI is unlikely to be carried out at this stage. In addition, as the sites are still in operation, it is considered not worthy to carry out the SI at this stage as on-going activities would make the assessment result obsolete.

8.4.1.3 In view of the above implication, it is recommended that further site visit be carried out by the PP’s appointed consultant once the future development of this site is confirmed and site access is available (e.g. after land resumption), in order to identify the need for SI for any additional hot spots as a result of the on-going activities. The PP’s appointed consultant would prepare and submit a supplementary CAP to present findings of the further site visit for EPD review and approval prior to the commencement of the SI works.

8.4.1.4 After approval of the supplementary CAP and upon completion of the SI works, if any, the PP’s appointed consultant would prepare a Contamination Assessment Report (CAR) to present findings of the SI works. If contamination has been identified, a Remediation Action Plan (RAP) would be prepared to formulate appropriate remedial measures to deal with the contamination identified. Following completion of any necessary remediation works, a Remediation Report (RR) would be prepared to demonstrate adequate clean-up and submit to EPD for approval prior to the commencement of any construction or development works at the contaminated sites.

8.4.2 Proposed Re-appraisal for Surveyed Sites, the Remaining Areas of the PDAs and the Works Areas for the Associated Infrastructures

8.4.2.1 Re-appraisal would be required for the surveyed sites, other remaining areas of the PDAs and the works areas for the associated infrastructures because the development of these sites/ areas would only commence a number of years later, which may allow changes in the land usage of these sites and may give rise to potential land contamination issues.

8.4.2.2 The PP’s appointed consultant would re-appraise the surveyed sites and the remaining areas of the PDAs to assess the latest site situation once the land is handed over to the PP. Particular focus will be put on the 3 surveyed sites (i.e. TC-3, TC-8 and TC-11 where access is limited at this stage), especially for open storage TC-3.

8.4.2.3 The PP’s appointed consultant would prepare a supplementary CAP presenting the findings of the re-appraisal and strategy of the recommended SI, if required, and submit to EPD for review and approval.

8.4.2.4 After approval of the supplementary CAP and upon completion of the SI works, if any, the PP would prepare a CAR, to present findings of the SI works. If contamination has been identified, a RAP would be prepared to formulate appropriate remedial measures to deal with the contamination identified. Following completion of any necessary remediation works, a RR would be prepared to demonstrate adequate clean-up and submit to EPD for approval prior to the commencement of any construction or development works at the contaminated sites identified.

8.5 Submission Requirements of CAR, RAP and RR

8.5.1.1 The most relevant RBRGs corresponding to the future landuse should be adopted in assessing its land contamination level. Laboratory testing results from SI should be compared with correspondent RBRGs for the testing parameters in accordance with the EPD’s Guidance Manual for Use of RBRGs for Contaminated Land Management.

8.5.1.2 Following the completion of environmental SI and laboratory testing works, the PP would prepare the CAR. The CAR would present the findings of the SI and evaluate the level and extent of potential contamination. The potential environmental and human health impact based on the extent of potential contamination identified would also be evaluated.

8.5.1.3 If land contamination is identified during the proposed environmental SI and remediation is required, a RAP will be prepared. The objectives of RAP are:

· To undertake further site investigation where required;

· To evaluate and recommend appropriate remedial measures for the contaminated materials identified in the assessment;

· To recommend good handling practices for the contaminated materials during the remediation works;

· To recommend approximate handling and disposal measures; and

· To formulate optimal and cost-effective mitigation and remedial measures for EPD’s agreement.

8.5.1.4 A RR would also be prepared to demonstrate that the clean-up works are adequate. No construction works or development of site should be carried out prior to the approval of the RR.

8.6 Conclusion

8.6.1.1 This land contamination assessment examined the potential contaminative land use within the PDAs and the works areas for the associated infrastructures. The assessment involved desktop review, site surveys and the proposed environmental SI.

8.6.1.2 Environmental SI was proposed for a total of 4 potentially contaminated sites in the PDA at TCW. However, since all the 4 potentially contaminated sites are located in private land lot, SI is unlikely to be carried out at this stage. In addition, as the sites are still in operation, it is considered not worthy to carry out the SI at this stage as the on-going activities would make the assessment result obsolete.

8.6.1.3 In view of this, further site visit at these 4 potentially contaminated sites are proposed once future development of these sites are confirmed and that site access is available in order to identify the need for SI for any additional hot spots as a result of the on-going activities.

8.6.1.4 In addition, re-appraisal would be required for the other surveyed sites, other remaining areas of the PDAs and the works areas for the associated infrastructures to address any change in land use that may give rise to potential land contamination issues.

8.6.1.5 Findings of the further site visit at the 4 potentially contaminated sites and the re-appraisal will be presented in a supplementary CAP. Upon approval of the supplementary CAP and completion of the SI works, a CAR would be prepared to present findings of the SI works. If contamination has been identified, a RAP would be prepared to recommend specific remediation measures. Upon completion of the remediation works, if any, a RR would also be prepared to demonstrate that the clean-up works are adequate. The CAR, RAP and RR would be submitted to EPD for approval prior to commencement of any construction /development works.