9. land contamination - environmental protection … report... · consultancy agreement no....

Consultancy Agreement No. NOL/ERL-300Environmental Impact Assessment of Hong Kong Section

of Guangzhou-Shenzhen-Hong Kong Express Rail LinkMTR Corporation Limited Environmental Impact Assessment Report

AECOM Environment 9-1 May 2009EIA S9 Land Contamination.doc

9. LAND CONTAMINATION

Introduction

9.1 Contaminated land refers to the land which has been polluted by hazardous substances as a resultof industrial operations carried out on site over a number of years. These contaminants if present,may pose hazardous risks or cause adverse effects to the land users and the nearby environment.

9.2 The implications of land contamination associated with the Project and its works areas have beenassessed with reference to the ESB. This section summarises the site appraisal results as in thecompleted Contamination Assessment Plan (CAP), site investigation results as reported in theContamination Assessment Report (CAR), and the recommended remediation works as in theRemediation Action Plan (RAP) together with the overall findings and recommendations in EIAperspective.

Environmental Legislation, Standards and Guidelines

9.3 The relevant environmental legislation guidelines and standards on land contamination aspectinclude the followings:

(i) Section 3 (Potential Contaminated Land Issues) of Annex 19 “Guidelines for Assessment ofImpact on Sites of Cultural Heritage and Other Impacts” of the Technical Memorandum onEnvironmental Impact Assessment Process (EIAO-TM).

(ii) Guidance Note for Contaminated Land Assessment and Remediation” (Guidance Note 1)

Guidance Note 1 sets out the requirements for proper assessment and management ofpotentially 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. Inaddition, this Guidance Note provides guidelines on how site assessments should beconducted and analysed and suggests practical remedial measures that can be adopted forthe cleanup of contaminated sites.

(iii) Guidance Notes for Investigation and Remediation of Contaminated Sites of Petrol FillingStations, Boatyards and Car Repair /Dismantling Workshop” (Guidance Note 2)

Guidance Note 2 specifically sets out guidance for land contamination assessment andremediation for sites previously used for petrol filling stations, boatyards and vehiclerepair/dismantling workshops.

(iv) Guidance Manual for Use of Risk-based Remediation Goals for Contaminated LandManagement (Guidance Manual)

Guidance Manual introduces the risk based approach in land contamination assessmentand present instructions for comparison of soil and groundwater data to the Risk-basedRemediation Goals (RBRGs) for 54 chemicals of concern commonly found in Hong Kong.The RBRGs were derived to suit Hong Kong conditions by following the internationalpractice of adopting a risk-based methodology for contaminated land assessment andremediation and were designed to protect the health of people who could potentially beexposed to land impacted by chemicals under four broad post restoration land usecategories. The RBRGs also serve as the remediation targets if remediation is necessary.




Assessment Methodology

9.4 The first step was to assess and identify any potentially contaminative sites within the project area.The following tasks have been undertaken to identify and evaluate the potential land contaminationimpacts associated with the Project:

Desktop study to review the current and historical land uses;

Acquisition of information related to potential land contamination from EnvironmentalCompliance Division of Environmental Protection Department (EPD) and Fire ServicesDepartment (FSD) and

Site reconnaissance to identify the existing land uses and potential.

9.5 In addition, the following sources of information have been collated and reviewed:

Selected aerial photographs from Lands Department;

the Hong Kong Geological Survey Maps (Series HGM20) – Sheet Nos. 2, 5, 6, 7, 10 and 11(1:20,000);

Information of dangerous goods for potentially contaminated areas from Fire ServicesDepartment (FSD);

Records and photographs from site visit; and

Relevant approved EIA report (i.e. Kowloon Southern Link (KSL) EIA (Register No.: AEIAR-083/2005) and EIA reports for Proposed Comprehensive Development at Wo Shang Wai, YuenLong (Register No.: AEIAR-120/2008)).

9.6 According to the findings of site appraisal, the Contamination Assessment Plan (CAP) as given inAppendix 9.1 was prepared and submitted to EPD. Based on the desktop reviews and siteinspections, sampling locations and sampling depths for soil and groundwater at the potentialcontaminated sites have been proposed for the site investigation (SI) works in this CAP. The CAPalso specified the sampling and testing requirements for the SI works.

9.7 Owing to time and site constraints, the site investigation is proposed in 2 stages. In Stage 1,sampling has been conducted at hotspots with the objective to preliminary assess the soil andgroundwater quality through sampling and laboratory testing at worst case locations of potentialcontaminated sites. After the completion of the SI works, the analytical results of the soil andgroundwater were interpreted using RBRGs. The nature, level and extent of the land contaminationat the potential land contaminated sites were evaluated and the findings were documented in theContamination Assessment Report (CAR). Options of remedial works for contaminated soil havebeen reviewed and evaluated, and appropriate remediation option has been recommended. Detailsare presented in the Remediation Action Plan (RAP). A copy of the CAR and RAP are given inAppendix 9.2.

9.8 Remediation works to clean up the contaminated sites if necessary will be carried following therequirements in the RAP during the construction phase.

9.9 In Stage 2, site investigation will be conducted at the rest of the site area to assess the site conditionin general. Stage 2 SI will be conducted after the completion of the EIA study/land resumption andprior to the commencement of construction works at respective sites. The sites which are infeasiblefor inspection and/or site investigation under Stage 1 will also be assessed in this stage.Supplementary CAR(s) and if contamination found, RAP(s) will be submitted for EPD endorsement.




Description of the Environment

9.10 The Study Area of the land contamination impact assessment including the railway alignment andboundaries of all associated works areas under the Project are shown in Figure Nos.NOL/ERL/300/C/XRL/ENS/M50/001-003, M57/200-228 and M57/300-328 in Appendix 9.1.

9.11 Based on the engineering design available at this stage, the specific sites for this contaminated landassessment have been classified as follows:

(i) Railway alignment

9.12 The railway starts at Shenzhen-Hong Kong border in Huanggang and ends at West KowloonTerminus with a total alignment of 26 km long. The railway will be constructed by either tunnelboring machine (TBM), cut-and-cover (C&C), and drill and blast (D&B) as shown in Figures Nos.NOL/ERL/300/C/XRL/ENS/M50/001-003 and 200-208 of Appendix 9.1.

(ii) West Kowloon Cut and Cover (WKCC) Section

9.13 West Kowloon Cut and Cover (WKCC) Section will cover the area occupied for West KowloonTerminal (WKT) and its associated works area, ventilation building located next to Jordan Road(WKV), the cut and cover section for the Ventilation Building located at Mok Kok West (MKV), theconstruction shafts at Hoi Ting Road (HTW) and West Kowloon barging point (WKB). The WKCCSection will cover an area of approximately 420,000m2 and shown in Figure Nos.NOL/ERL/300/C/XRL/ENS/M50/319-320 of Appendix 9.1.

(iii) Shek Kong Stabling Sidings (SSS)

9.14 Shek Kong Stabling Sidings (SSS) is a cut & cover site located at Shek Kong. The works area ofSSS will take approximately 400,000m2 covering the Emergency Rescue Station (ERS), approachtunnels at both ends of ERS and the nullah diversion works located at the north of the SSS asshown in Figure Nos. NOL/ERL/300/C/XRL/ENS/M50/305-309 of Appendix 9.1.

(iv) Ventilation Building Sites (VB)/ Emergency Access Point (EAP)

9.15 There will be a total of seven ventilation buildings along the railway corridor for tunnel ventilation andanother one adjacent to the WKT for track fan and terminus ventilation. Furthermore, an EmergencyAccess Point (EAP) will also be provided at Tai Kong Po (TPP). A description of the VB/EAPinvolved is provided in Table 9.1

Table 9.1 Ventilation Building Sites/ Emergency Access Point (EAP)

Location I.D. Description Reference Figure inCAP (Appendix 9.1)

MPV Ventilation Building Works Area in Mai Po near SanTin Highway

NOL/ERL/300/C/XRL/ENS/M57/301

NTV Ventilation Building and Works Area in Ngau Tam Meito the south-east of San Wai Tsuen


TPP Tai Kong Po Emergency Access Point NOL/ERL/300/C/XRL/ENS/M57/304-305

NorthernSection

PHV Ventilation Building and Works Area in Pat Heung NOL/ERL/300/C/XRL/ENS/M57/310

SMV Ventilation Building in Shing Mun NOL/ERL/300/C/XRL/ENS/M57/311

KCV Ventilation Building in Kwai Chung and associatedWorks Area


NCV Ventilation Building and Works Area in Nam Cheongat Sham Mong Road

NOL/ERL/300/C/XRL/ENS/M57/316, 318

SouthernSection

MKV Works area and Ventilation Building in Mongkok Westat Hoi Wang Road (assessed under WKCC Section)






WKV Ventilation Building next to Jordon Road (assessedunder WKCC section)


(v) Supporting Works Area

9.16 In addition to WKCC Section, SSS and VB/EAP Sites, there are fourteen supporting works arearequired in this Project, including the temporary construction shafts, nursery and storage areas andbarging points as shown in Table 9.2.

Table 9.2 Supporting Works Area


Works Areas

TUW Tse Uk Tsuen Construction Shaft NOL/ERL/300/C/XRL/ENS/M57/310

SYW Works Area and construction shaft in Shek Yam NOL/ERL/300/C/XRL/ENS/M57/312

MLW Works Area and construction shaft at Mei Lai Road NOL/ERL/300/C/XRL/ENS/M57/315

LCW Lai Chi Kok Works Area NOL/ERL/300/C/XRL/ENS/M57/315-316

HTW Works area and construction shaft for Hoi Ting Road (assessedunder WKCC Section)


Nursery and Storage Areas/ Magazine Sites

SLSW Works Area in Siu Lang Shui for nursery purpose only NOL/ERL/300/C/XRL/ENS/M57/325

SKW Magazine Site and works Area in So Kwun Wat for nursery andstorage purpose only


TSW Magazine Site near Tai Shu Ha Road West NOL/ERL/300/C/XRL/ENS/M57/326

Barging Points

NCB Nam Cheong Barging Point NOL/ERL/300/C/XRL/ENS/M57/317

WKB West Kowloon Barging Point and stockpile area nearby(assessed under WKCC Section)


RCB Barging Point in Rambler Channel NOL/ERL/300/C/XRL/ENS/M57/314

SLB Barging Point in Siu Lam NOL/ERL/300/C/XRL/ENS/M57/324

LKB Barging Point in Lung Kwu Sheung Tan NOL/ERL/300/C/XRL/ENS/M57/328

TCB Tsing Chau Tsai Barging Point NOL/ERL/300/C/XRL/ENS/M57/327

Identification of Potential Environmental Impacts

Identification of Impact Sources

9.17 The Project covers a lot of areas with various existing and historical uses. The Project will resumethese areas for the construction of railway, stations and associated facilities. The existing structureson these areas will be decommissioned.

9.18 The issue of land contamination refers to land which has been polluted by hazardous substances asa result of industrial or commercial operations carried out on and around the site over a number ofyears. Very often, these contaminants pose hazardous risks or cause detrimental effects particularlyto the land users. For example, toxic chemicals used in a chemical processing plant can find theirway into the ground after some time through accidental spills or leaks. These toxic chemicals can




contaminate the soil and groundwater. It is important that special attention be given to potentiallycontaminated sites to ensure their proper management, if necessary.

9.19 The identification of these potential contaminative areas within the project areas has beencompleted in the CAP stage through the site appraisal exercise. The technical details of the CAPare provided in the Appendix 9.1 and the list of potential contaminated sites identified in this Projecthas been summarized in Table 9.3.

Table 9.3 Potential Contaminated Sites Identified in this Project

Location Site ID Current Land Uses

Shek Kong Stabling and Sidings (SSS)F Construction Equipment Repair & Maintenance WorkshopG Scrap YardL Vehicle Repair WorkshopM Open AreaP Storage Area (“Factory”)Q Parking area with minor vehicle repair /maintenance

activitiesR Vehicle Repair Workshop

SSS

S Vehicle Repair WorkshopVentilation Building Sites and Emergency Access Point (VB/EAP)

MPV D Container truck parking area with minor repair/ maintenanceactivities

MPV E Container truck parking area with car wash and paint boothKCV H Scrap Yard

Supporting Works AreaNCB J Container YardMLW T Car parkLCW K Open Area ( A chemical Storage Area was found nearby)

9.20 Some areas were not feasible for inspection on site and further site investigation as these areaswere either locked or access being denied by the occupiers during site appraisal under CAP. Siteinspection should be carried out to ascertain any contaminative sources and hotspots ofcontamination within the site when site access is granted and a revised CAP should then besubmitted to EPD for endorsement. Upon completion of SI and laboratory testing, a CAR and ifnecessary, a RAP should also be submitted to EPD for endorsement as well. For sites which are notfeasible for site investigation works, CAR and if necessary, RAP should also be prepared andsubmitted to EPD to endorse. Table 9.4 summarizes the areas which are infeasible for siteinspection and further investigations.

Table 9.4 Areas Infeasible for Site inspection and Further Investigations


AREAS INFEASIBLE FOR ON-SITE INSPECTION AND SITE INVESTIGATIONWest Kowloon Cut and Cover (WKCC) Section

WKCC X Golf courseShek Kong Stabling Sidings (SSS)

I Suspected vehicle repair workshopO Suspected excavator parking area with repair / maintenance activitiesB Suspected occupied for industrial activitiesN Suspected occupied for industrial activitiesU Suspected occupied for industrial activitiesV Suspected occupied for industrial activities

SSS

W Suspected occupied for industrial activitiesVentilation Building Sites and Emergency Access Point

MPV A Suspected occupied for recycling industry





C Suspected to have vehicle repair activities undertakenWSW Review of WSW EIA indicated the site to be occupied for lorry parking and vehicle

and container storage area.AREAS INFEASIBLE FOR SITE INVESTIGATIONShek Kong Stabling and Sidings (SSS)

L Vehicle Repair WorkshopP Storage Area (“Factory”)SSSR Vehicle Repair Workshop

Ventilation Building Sites and Emergency Access Point (VB/EAP)MPV E Container truck parking area with car wash and paint booth

Supporting SitesNCB J Container YardMLW T Car parkLCW K Open Area ( A chemical Storage Area was found nearby)

Identification of Sensitive Receivers

9.21 Construction workers are the most likely group to be exposed to any potential contaminatedmaterials during the decommissioning stage for the identified contaminated sites. The principleexposure routes for workers include:

Direct ingestion of contaminated soils through eating or drinking/smoking on site; and

Dermal contact with contaminated soils.

9.22 There would be no sensitive receivers during the operational phase of the Project provided thatremediation actions if necessary are completed.

9.23 During the remediation work stage, there may be environmental impacts arisen from the remediationprocess (e.g. air emissions and water discharges, etc) that may affect the surrounding sensitivereceivers e.g. human receivers and water bodies. Proper mitigation measures should be consideredand implemented for remediation work.

Prediction and Evaluation of Environmental Impacts

Site Investigation Results

9.24 Potentially contaminated sites have been identified in the CAP (Appendix 9.1) and site investigationinvolving sampling and testing of soil and groundwater at identified hotspots have been completed.Laboratory results provide the concentrations of chemical of concerns for comparison with theRBRGs. To summarize, the results of site investigation are given in the Table 9.5 below:

Table 9.5 Summary of SI findings

Location Site ID No. ofDrillhole

No. of SampleTested

Compliance toIndustrial RBRG

Planned Post-Restoration Land

Uses

MPV

D(Container Truck Parking Area

with Minor Repair/Maintenance Activities)

1 5 All sample resultscomplied Railway Facilities

SSS F(Vehicle Repair Workshop) 4 18 All sample results

compliedShek Kong

Stabling Siding

SSS G(Scrap Yard) 4 14 All sample results

compliedShek Kong

Stabling Siding




Location Site ID No. ofDrillhole

No. of SampleTested

Compliance toIndustrial RBRG

Planned Post-Restoration Land

Uses

SSS

Q(Parking Area with Minor

Repair/ MaintenanceActivities )

5 262 samples exceed

limit for bis-(2-Ethylhexyl)phthalate

Railway Facilities

SSS S(Vehicle Repair Workshop) 2 10 All sample results

complied Railway Facilities

SSS M(Open Storage) 4 20 All sample results

complied Railway Facilities

KCV H(Scrap Yard) 3 5

1 sample exceedlimit for bis-(2-

Ethylhexyl)phthalateRailway Facilities

NgauTam MeiLandfill

LF 2 2 All sample resultscomplied Railway Alignment

Total - 25 100

3 samples exceedlimit for bis-(2-

Ethylhexyl)phthalate

-

9.25 Most of the sites are found complied with the relevant RBRGs and hence no adverse impacts onland contamination are identified. There are two sites with small volume of contaminated soil notmeeting the RBRB, and their details are given in Table 9.6 below:

Table 9.6 Location, Depth and Estimated Quantity of Contaminated Soil FoundEstimated Contamination Extent

Location SiteID Borehole ID

Depth withContaminated

Soil Found(m BelowBase of

Concrete)

ContaminantVertical(m BBC)(Thickness (m))

Horizontal(m2)

Volume(m3)

KCV H 2108/XRL/EDH27 0.5 0-0.7m*(0.7m thick) 25 17.5

Q 2108/XRL/EDH-Q04 1.50-2.40m 1.4m-2.9m**

(1.5m thick) 25 37.5SSS

Q 2108/XRL/EDH-Q-05 4.95-5.85m

bis--(2-Ethylhexyl)phthalate

4.45m-5.85***(1.4m thick) 25 35

Estimated Total Volume of Contamination=~90m3

Note:* Presence of concrete and granite from 0.7m BBC to the termination of the borehole.** Sampling at 0.50-1.40m BBC indicated no exceedance of bis--(2-Ethylhexyl)phthalate.*** Sampling at 5.85-6.75m BBC indicated no exceedance of bis--(2-Ethylhexyl)phthalate.

9.26 The sites are located in Kwai Chung Ventilation Building Works Area (KCV) and Shek Kong Stablingand Sidings Works Area (SSS). The chemical of concern for both sites are the same, Bis(2-ethylhexyl)phthalate.

9.27 Bis(2-ethylhexyl)phthalate (DEHP), is an organic chemical commonly abbreviated as DEHP. It is anodourless colourless liquid with the formula C6H4(CO2C8H17)2. The chemical is semi-volatile, withvapour pressure of only 1.32 mm Hg at 200oC (while vapour pressure of benzene is 100 mm Hg at26.1 oC). It is insoluble in water but soluble in with mineral oil, hexane, and most organic solvents. Itis widely used as a plasticizer in manufacturing of articles made of polyvinyl chloride (PVC) and alsoused as hydraulic fluid, dielectric fluid in capacitors and solvent in lightsticks.




Remediation Actions and Mitigation Measures

Review of Remediation Options

9.28 A review of remediation options have been conducted in the RAP in Appendix 9.2. The optionsinclude biopiling, ex-situ chemical oxidation (ESCO), soil venting, landfarming, natural attenuationand excavation and landfill disposals.

9.29 Table 9.7 shows consideration of the characteristics of the two sites and the Chemical of Concern(COC) identified in order to determine the effective remediation method. Biopiling and ex-situchemical oxidation are identified as the preferred method of remediation. Organic contaminants willbe degraded into non-hazardous chemicals through the enhanced and controlled environment in thepiles.

Table 9.7 Factors for Remediation Considerations

Site ID

Depth ofContaminated

Soil (in mBelow Baseof Concrete)

ContaminantIdentified

ExistingContamination

Level(mg/ kg)

RBRG(Industrial)

(mg/kg)Soil

CharacteristicsTime required

for Remediation

2-6 months(for ESCO)

Site H atKCV

(ScrapYard)

0.5 134 91.8

Fill material(gravel sized

concrete and tilefragment)

3-12 months(for Biopile)2-6 months (for ESCO)1.50-2.40, 2540 91.8

Fill material(sandy clayey

silt) 6-18 months(for Biopile)2-6 months(for ESCO)

Site Q atSSS

(ParkingArea with

MinorVehicleRepair

Activities)4.95-5.85

bis-(2-Ethylhexl)phthalate

356 91.8

Alluvium (sandysilty clay and

clayey silty fineto coarse sand)

6-12 months(for Biopile)

Note:*Assuming remediation with biopiling/ ESCO, subject to further monitoring and enhancement measures.

9.30 As shown in Table 9.6, the volume of contaminated soil identified at KCV and SSS were 17.5m3 and72.5m3 respectively. The small volume allows flexibility to conduct biopiling/ ESCO on site. Theschematic layout of a typical biopile is shown in Figure Nos. NOL/ERL/300/C/XRL/ENS/M57/153 inCAR/RAP as shown in Appendix 9.2.

Remediation Method and Remediation Target

9.31 The remediation target for bis-(2-Ethylhexyl)phthalate is proposed as

the industrial landuse of RBRG i.e. 91.8 mg/kg

The decontaminated soil will generally reuse and backfill on site. This sites Q and H will beconstructed to be railway related facilities. This target will be adopted in the project.

9.32 For other contamination identified after this EIA as in the Stage 2 site investigation, the remediationtarget should generally make reference to the “industrial” land use category.

9.33 The remediation works will include firstly the excavation of identified contaminated area and thenfollowed by a closure assessment to verify clearance of contaminated soil. The excavatedcontaminated soil will form piles for either biopiling or chemical oxidation. During the operation,monitoring of treatment performance will be carried out in the form of regular sampling and testing.Once the monitoring data indicate treatment target is achieved, a closure assessment sampling andtesting will be carried out at a defined sampling frequency for the treated soil. The acceptancecriterion is defined as the contaminant concentration being complied with the treatment target. Inthe event that the samples still exceed the remediation target, treatment will continue until the soil




target values are achieved. Following validation of successful soil treatment, a remediation report(RR) demonstrating completion of remediation works will be prepared and submitted to EPD forendorsement prior to the commencement of any construction works. With the approval of the RR,the decontaminated soil will be used as fill materials for re-use on site with reference to the land usescenario in the RBRG.

9.34 The detail requirements of the proposed remediation work are given in the RAP in the Appendix 9.2.In any case, reference shall be made to the RAP for remediation works.

Summary of Proposed Mitigation Measures

9.35 The followings are the summary of mitigation measures proposed (recommended in the CAP, CARand RAP) to mitigate the land contamination impacts:

Tunnel Section at Ngau Tam Mei Landfill

(i) Visual inspection should be carried out when tunnel boring is conducted at the sectionunderneath Ngau Tam Mei Landfill, with particular attention on the potential contaminationleaching from the landfill above the tunnel alignment. The inspection process should alsobe assisted by a photo ionization detector (PID) for volatile organics. If suspected materialsare encountered during tunnel boring, sampling and testing should also be undertaken toverify any contamination. The soil bored out during excavation and tunnel boring should betemporary stockpiled and if laboratory analysis indicated exceedance of relevant RBRGlevels, remediation works, should be undertaken with reference to the CAR and RAP.

Alignment Section at 82 Tai Kok Tsui Road near PFS No.9/ Works Area near Lai Cheung RoadChina Light and Power (CLP) Substation.

(ii) Visual inspection should be carried out at the alignment section near petrol filling station No.9 as outlined in Table 5.6 of the CAP (Appendix 9.1) and at works area close to Lai CheungRoad CLP substation. The inspection process should also be assisted by a photo ionizationdetector (PID) for volatile organics. If suspected materials are encountered during tunnelboring, sampling and testing should also be undertaken to verify any contamination. The soilbored out during excavation and tunnel boring should be temporary stockpiled and iflaboratory analysis indicated exceedance of relevant RBRG levels, remediation works,should be undertaken with reference to the CAR and RAP.

Remediation Works

(iii) In order to minimise the potentially environmental impacts arising from the handling ofpotentially contaminated materials, the following environmental mitigation measures arerecommended during the course of the site remediation:

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

Excavation should be carried out during dry season as far as possible to minimisecontaminated runoff from contaminated soils;

Supply of suitable clean backfill material is needed after excavation;

The chemical oxidant proposed (RegenOxTM) as a contaminant mass reductiontechnology. Comprises a solid oxidant complex (sodium percarbonate/catalyticformulation) and an activator complex (a composition of ferrous salt embedded in amicro-scale catalyst gel). These chemical will be securely stored, separately and wayfrom sources of ignition or oxidizable items. Handling will & will be undertaken bypersons specifically trained and wearing appropriate PPE.

Vehicles containing any excavated materials should be suitably covered to limit potential




dust emissions or contaminated wastewater run-off, and truck bodies and tailgates shouldbe sealed to prevent any discharge during transport or during wet conditions;

Speed control for the trucks carrying contaminated materials should be enforced;

Vehicle wheel and body washing facilities at the site’s exist points should be establishedand used; and

Pollution control measures for air emissions e.g. from biopile blower, noise emissions e.g.from blower, and water discharges e.g. runoff control should be implemented andcomplied with relevant regulations and guidelines.

(iv) In order to minimise the potential adverse effects on health and safety of constructionworkers during the course of site remediation, the Occupation Safety and Health Ordinance(OSHO) (Chapter 509) and its subsidiary Regulations should be followed by all sitepersonnel working on the site at all times. In addition, basic health and safety measuresshould be implemented, but not limited to the followings:

Set up a list of safety measures for site workers;

Provide written information and training on safety for site workers;

Keep a log-book and plan showing the contaminated zones and clean zones;

Maintain a hygienic working environment;

Avoid dust generation;

Provide face and respiratory protection gear to site workers if necessary;

Provide personal protective clothing (e.g. chemical resistant jackboot, liquid tightgloves) to site workers if necessary; and

Provide first aid training and materials to site workers.

Further Site Investigation

(v) Owing to time and site constraints, site investigation is proposed in 2 stages. In Stage 1,sampling has been conducted at hotspots with the objective to preliminary assess the soiland groundwater quality through sampling and laboratory testing at worst case locations ofpotential contaminated sites while in stage 2 site investigation will be conducted at the restof the site area to assess the site condition in general. Stage 2 SI will be conducted after thecompletion of the EIA study/land resumption and prior to the commencement of constructionworks at respective sites. The sites which are infeasible for inspection and/or siteinvestigation under Stage 1 will also be assessed in this stage. Table 9.8 summarizes thesites where further investigation is required. Details can be referred to CAP and CAR/RAPas shown in Appendix 9.1 and 9.2. Upon site access is granted, site inspections will becarried out to ascertain any contaminative sources and hotspots of contamination withineach site in Table 9.8. Revised CAPs with sampling and testing schedule updated based onrespective site condition should then be submitted to EPD for endorsement. Aftercompletion of sampling and testing, supplementary CARs and if contamination found,RAP(s) will be submitted for EPD endorsement. The revised CAPs and supplementaryCARs and RAP(s) should be submitted in separate packages for different works areadepending on the schedule of land resumption and the commencement of constructionworks for each works area.

Consultancy Agreement No. NOL/ERL-300Environmental Impact Assessment of Hong Kong Section of Guangzhou-Shenzhen-Hong Kong Express

Rail LinkMTR Corporation Limited Environmental Impact Assessment Report


Table 9.8 Summary of Areas for Site Appraisal and Investigation in Stage 2Site ID of

InaccessibleSite

Review of theavailable information

Initial contaminationevaluation of those

inaccessible sites andpossible remediation methods

Confirmation of whether thecontamination problem atthis/these site(s) would be

surmountable

Sampling and analysisproposal which shall

aim at determining thenature and the extent of

the contamination ofthis/these site(s)

Schedule of submission ofrevised CAP (if necessary),

CAR, RAP and RR

AREAS INFEASIBLE FOR ON-SITE INSPECTION AND SITE INVESTIGATION

West Kowloon Cut and Cover (WKCC) SectionSite X atWKCCGolf course

(NOL/ERL/300/C/XRL/ENS/M57/025 ofCAP)

Site AppraisalThe site was locatedon reclaimed land.The site is currentlyoccupied by City GolfClub as a golf course.Access to the site wasattempted but wasrefused by thereception.

Initial Contamination EvaluationThe site was inaccessible for siteinspection. The potential of landcontamination is uncertain. Asthe site was occupied as a golfcourse where pesticide mighthave been used, landcontamination concern cannot beneglected. It is also noted thatpart of the course is made up ofartificial turf/grass.Possible ContaminantsHeavy metals, organiccompounds particularlypesticides.Possible Remediation MethodsDepending on the contaminatedsoil quantity and quality,possibly:

Bioremediation such as bio-pile and composting fororganic contaminants.Stabilization/solidification forheavy metals.

The site was occupied as a golfcourse during site inspection.The site area is around13,500m2. Considering thepotential presence ofcontaminants, there would notbe insurmountable impactsassociated, but the future workprogramme should be allowedtime for remediation works (ifcontamination is found).

Could be from 0 to 41boreholes based on aregular grid pattern at thisstage (subject to review)across the site areproposed with referenceto Guidance Note 2across the golf course.The key point is toassess any impacts dueto the use ofherbicides/pesticides.

Proposed parameters tobe tested are given inTable 6.1 of CAP.

Sampling and testing areproposed to beconducted in Stage 2supplementary SI works.

Revised CAPUpon site access is granted, siteinspection should be carried outto ascertain any contaminativesources and hotspot ofcontamination within the site.The sampling and testingschedule as recommended inthe approved CAP should beupdated based on respectivesite situation and the area that ispotentially affected by the use ofpesticides. Based on the actualsite condition, the number ofsampling locations may besignificantly reduced. A revisedCAP should then be submitted toEPD for endorsement.

CAR and RAPUpon completion of SI andlaboratory testing, a CAR shouldbe submitted to EPD forendorsement. If contaminationis identified, a RAP should alsobe submitted to EPD forendorsement.




Site ID ofInaccessible

Site





surmountable





CAR, RAP and RR

RRA RR should be submitted todemonstrate completion ofremediation works beforeconstruction work starts at thesite.

Shek Kong Stabling Sidings (SSS)Site I at SSSSuspectedvehicle repairworkshop


Site AppraisalPast land uses of thesite were observed tobe farms, workshopand garage.Inspection inside thesite was not possible.The site wassuspected as a vehiclerepair/dismantlingworkshop based onobservation fromsurrounding.

Initial Contamination EvaluationPotential concern related tocurrent operation with vehiclerepair/maintenance activities.Possible ContaminantsPetroleum hydrocarbons, metalsand organic solvents.Possible Remediation MethodsDepending on the contaminatedsoil quantity and quality,possibly:

Cementstabilization/solidification forheavy metals.Bioremediation such as bio-pile and composting fororganic contaminants.

The site has a small area(500m2) and would have onlybeen used for vehiclemaintenance/dismantling. Landcontamination causinginsurmountable impacts wouldnot be likely. Moreover, thereare available and commonlyadopted remediation methodsfor the potential contaminants.

As specific hotspots ofcontamination cannot beidentified due toinaccessibility, maximum4 boreholes based on aregular grid pattern at thisstage (subject to review)across the site areproposed with referenceto Guidance Note 2.

Proposed parameters aregiven in Table 6.1 ofCAP.


Revised CAPUpon site access is granted, siteinspection should be carried outto ascertain any contaminativesources and hotspot ofcontamination within the site.The sampling and testingschedule as recommended inthe approved CAP should thenbe updated based on respectivesite situation and the number ofsampling locations may besignificantly reduced. A revisedCAP should then be submitted toEPD for endorsement.

CAR and RAPUpon completion of SI andlaboratory testing, a CAR shouldbe submitted to EPD forendorsement. If contaminationis identified, a RAP should alsobe submitted to EPD for





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endorsement.RRA RR should be submitted todemonstrate completion ofremediation works beforeconstruction work starts at thesite.

Site O atSSSSuspectedexcavatorparking areawith repair/maintenanceactivities


Site AppraisalPast land uses of thesite were observed tobe farms, workshopand garage.Inspection inside thesite was not possible.The site wassuspected to be anexcavator parkingarea with somemaintenance andrefuelling activitiesbased on limitedobservation fromoutside.

Initial Contamination EvaluationPotential land contamination dueto suspected excavatormaintenance and refuelling.Possible ContaminantsMetals, petroleum hydrocarbonsand organic solvents.Possible Remediation MethodsDepending on the contaminatedsoil quantity and quality,possibly:


The site has a small area (300m2) and would have only beenused for vehicle maintenance.Land contamination causinginsurmountable impacts wouldnot be likely. Moreover, thereare available and commonlyadopted remediation methodsfor the potential contaminants.

As hotspot ofcontamination cannot beidentified due toinaccessibility, from 0 upto 2 boreholes areproposed with referenceto Guidance Note 2.

Proposed parameters tobe tested are given inTable 6.1 of CAP.


Same as Site I above

Site B at SSSSuspectedoccupied for

Site AppraisalThe site was occupiedby farms and some

Initial Contamination EvaluationSite inspection inside the sitewas not possible. The site was

The site was only suspectedwith industrial activities at thisstage based on the very limited

The site activities are notknown. As hotspot ofcontamination cannot be






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industrialuses


low-rise buildingstructure in the past.Currently, the site isoccupied by temporarystructures withunknown usage.Access to thosetemporary structureswas attempted but thiswas refused bytenants. Some formsof industrial activitiesobserved in thetemporary structures.However, nature andtype of industry werenot known.

suspected to have some forms ofindustrial activities.Possible ContaminantsNot able to determine at thisstage.Possible Remediation MethodsDepending on the contaminatedsoil quantity and quality,possibly:

Bioremediation such as bio-pile and composting fororganic contaminants.Stabilization/solidification forheavy metals.

information.The site area is around 17,000m2. Considering its scale ofactivities, there would not beinsurmountable impactsassociated, but the future workprogramme should be allowedtime for remediation works (ifcontamination is found).

identified due toinaccessibility, from 0 upto 51 boreholes based ona regular grid pattern atthis stage (subject toreview) across the siteare proposed withreference to GuidanceNote 2. Since thepotential contaminantswere not known, a broadlist of parameters to betested.Details of the samplingand analysis for this siteare given in Table 6.1 ofCAP.Sampling and testing areproposed to beconducted in Stage 2supplementary SI works.

Site N atSSSSuspectedoccupied forindustrialuses

(NOL/ERL/30

Site AppraisalThe site was occupiedby farms and somelow-rise buildingstructure in the past.The site is currentlyoccupied by temporarystructures withunknown usage.Access to those

Initial Contamination EvaluationThe site was inaccessible for siteinspection. The potential of landcontamination is uncertain.However, as the site issuspected be occupied forindustrial use, there might be ofland contaminative concern dueto contaminative industrialactivities.

The site was only suspectedwith industrial activities at thisstage based on the very limitedinformation.The site area is around4,500m2. Considering its scaleof activities, there would not beinsurmountable impactsassociated, but the future workprogramme should be allowed

The site activities are notknown. As hotspot ofcontamination cannot beidentified due toinaccessibility, from 0 upto 14 boreholes based ona regular grid pattern atthis stage (subject toreview) across the siteare proposed withreference to Guidance

Same as Site I above.





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0/C/XRL/ENS/M57/016 ofCAP)

temporary structureswas attempted but thiswas refused bytenants. Some formsof industrial activitiesobserved in thetemporary structures.However, nature andtype of industry werenot known.

Possible ContaminantsNot able to determine at thisstage.Possible Remediation MethodsDepending on the contaminatedsoil quantity and quality,possibly:

Bioremediation such as bio-pile and composting fororganic contaminants andcyanide.Stabilization/solidification forheavy metals and PCBs.

time for remediation works (ifcontamination is found).

Note 2. Since thepotential contaminantswere not known, a broadlist of parameters to betested.

Details of the samplingand analysis for this siteare given in Table 6.1 ofCAP.Sampling and testing areproposed to beconducted in Stage 2supplementary SI works.

Site U atSSSSuspectedoccupied forindustrialuses


Site AppraisalThe site was occupiedby farms and somelow-rise buildingstructure in the past.The site is currentlyoccupied by temporarystructures withunknown usage.Access to thosetemporary structureswas attempted but thiswas refused bytenants. Some formsof industrial activitiesobserved in the

Initial Contamination EvaluationThe site was inaccessible for siteinspection. The potential of landcontamination is uncertain.However, as the site issuspected be occupied forindustrial use, there might be ofland contaminative concern dueto contaminative industrialactivities.Possible ContaminantsNot able to determine at thisstage.Possible Remediation MethodsDepending on the contaminated

The site was only suspectedwith industrial activities at thisstage based on the very limitedinformation.The site area is around 2,000m2. Considering its scale ofactivities, there would not beinsurmountable impactsassociated, but the future workprogramme should be allowedtime for remediation works (ifcontamination is found).

The site activities are notknown. As hotspot ofcontamination cannot beidentified due toinaccessibility, from 0 upto 6 boreholes based ona regular grid pattern atthis stage (subject toreview) across the siteare proposed withreference to GuidanceNote 2. Since thepotential contaminantswere not known, a broadlist of parameters to betested.






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temporary structures.However, nature andtype of industry werenot known.

soil quantity and quality,possibly:


Details of the samplingand analysis for this siteare given in Table 6.1 ofCAP.


Site V at SSSSuspectedoccupied forindustrialuses


Site AppraisalThe site was occupiedby farms and somelow-rise buildingstructure in the past.The site is currently asa vacant area withconstruction wastematerial found.

Initial Contamination EvaluationThe site was inaccessible for siteinspection. The potential of landcontamination is uncertain.However, as the site sharesimilar nature as a scrap yard,there might be of landcontaminative concern due tocontaminative industrialactivities.Possible ContaminantsNot able to determine at thisstage.Possible Remediation MethodsDepending on the contaminatedsoil quantity and quality,possibly:

Bioremediation such as bio-pile and composting fororganic contaminants and


The site activities are notknown. As hotspot ofcontamination cannot beidentified due toinaccessibility, from 0 upto 12 boreholes based ona regular grid pattern atthis stage (subject toreview) across the siteare proposed withreference to GuidanceNote 2. Since thepotential contaminantswere not known, a broadlist of parameters to betested.Details of the samplingand analysis for this siteare given in Table 6.1 ofCAP.Sampling and testing areproposed to be






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cyanide.Stabilization/solidification forheavy metals and PCBs.

conducted in Stage 2supplementary SI works.

Site W atSSSSuspectedoccupied forindustrialuses


Site AppraisalThe site was occupiedby farms and somelow-rise buildingstructure in the past.The site is currentlyoccupied by temporarystructures withunknown usage.Access to thosetemporary structureswas attempted but thiswas refused bytenants. Some formsof industrial activitiesobserved in thetemporary structures.However, nature andtype of industry werenot known.

Initial Contamination EvaluationThe site was inaccessible for siteinspection. The potential of landcontamination is uncertain.However, as the site issuspected be occupied forindustrial use, there might be ofland contaminative concern dueto contaminative industrialactivities.Possible ContaminantsNot able to determine at thisstage.Possible Remediation MethodsDepending on the contaminatedsoil quantity and quality,possibly:



The site activities are notknown. As hotspot ofcontamination cannot beidentified due toinaccessibility, from 0 upto 9 boreholes based ona regular grid pattern atthis stage (subject toreview) across the siteare proposed withreference to GuidanceNote 2. Since thepotential contaminantswere not known, a broadlist of parameters to betested.Details of the samplingand analysis for this siteare given in Table 6.1 ofCAP.Sampling and testing areproposed to beconducted in Stage 2supplementary SI works.






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Ventilation Building Sites and Emergency Access PointSite A atMPVSuspectedrecycling likeindustry


Site AppraisalPast land uses of thesite were observed asfarms, fish ponds andgarages.Inspection inside thesite not possible,suspected wasterecycling facility basedon observations fromthe surroundings.

Initial Contamination EvaluationPotential concern due to currentsuspected current operation withwaste handling/recycling.Possible ContaminantsPetroleum hydrocarbons, metals,PCB, cyanide and organicsolvents.Possible Remediation MethodsDepending on the contaminatedsoil quantity and quality,possibly:

Cementstabilization/solidification forheavy metals and PCB.Bioremediation such as bio-pile and composting fororganic contaminants.

The site has an area of5,000m2 and would have onlybeen used for wastehandling/recycling. Landcontamination causinginsurmountable impacts wouldnot be likely. Moreover, thereare available and commonlyadopted remediation methodsfor the potential contaminants.

As specific hotspots ofcontamination cannot beidentified due toinaccessibility, from 0 upto 15 boreholes based ona regular grid patternacross the site areproposed at this stage(subject to review) withreference to GuidanceNote 2.Proposed parameters tobe tested are given inTable 6.1 of CAP.Sampling and testing areproposed to beconducted in Stage 2supplementary SI works.


Site C (MPV)SuspectedVehicleRepairWorkshop

(NOL/ERL/30

Site AppraisalPast land uses of thesite were observed asfarms, fish ponds andgarages. Inspection inside thesite not possible,suspected having

Initial Contamination EvaluationPotential concern due to currentsuspected current operation as avehicle repair workshop.Possible ContaminantsPetroleum hydrocarbons, metalsand organic solvents.Possible Remediation Methods

The site has an area of3,000m2 and would have onlybeen used for vehiclemaintenance. Landcontamination causinginsurmountable impacts wouldnot be likely. Moreover, thereare available and commonlyadopted remediation methods

As specific hotspots ofcontamination cannot beidentified due toinaccessibility, from 0 upto 9 boreholes based ona regular grid pattern atthis stage (subject toreview) across the siteare proposed with






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0/C/XRL/ENS/M57/013 ofCAP)

vehiclerepair/maintenanceactivities based onobservations from thesurroundings.

Depending on the contaminatedsoil quantity and quality,possibly:


for the potential contaminants. reference to GuidanceNote 2.Proposed parameters aregiven in Table 6.1 ofCAP.


WSW atMPV


Site AppraisalPast land uses of thesite were observed asfish ponds, openstorage and garages.

Inspection inside thesite not possible.Review of WSW EIAindicated the site to beoccupied for lorryparking and vehicleand container storagearea. Review of aerialphoto suggested nosignificant changes inthe site layout with thedescribed land use inWSW EIA.

Under WSW EIA, the site wasidentified to be contaminatedwith Pb and/or Zn based onDutch B criteria.

The site has an area ofapproximately 8,000m2 andwould have only been used forlorry parking and vehicle andcontainer storage. Landcontamination causinginsurmountable impacts wouldnot be likely. Moreover, thereare available and commonlyadopted remediation methodsfor the potential contaminants.

NA According to WSW EP Condition3.14, the Project Proponent ofthe WSW development shallprepare and submit CAR/RAP toEPD within 2 months aftercommencement of constructionof the WSW development andthe recommendations in theendorsed CAR/RAP shall befully implemented before thecommencement of anyconstruction works that maydisturb the ground of therelevant sites.This project will ensure that thecompletion of remediation worksbefore the construction works atcontaminated areas start.

Areas Infeasible for Site Investigation





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Shek Kong Stabling Sidings (SSS)Site PStorage Area


Site AppraisalPast land uses of thesite was found to befarms, workshop,factory. The site iscurrently used asstorage area.

Initial Contamination EvaluationPotential concern due to pastindustrial use was identifiedPossible ContaminantsPetroleum hydrocarbons, metals,organic solvents, PCB andcyanide.Possible Remediation MethodsDepending on the contaminatedsoil quantity and quality,possibly:

Stabilization/solidification forheavy metals and PCB.Bioremediation such as bio-pile and composting fororganic contaminants andcyanide.

The site has an area 1,500m2

occupied as storage area.Large scale industrial activitiesmight not be encountered. Landcontamination causinginsurmountable impacts wouldnot be likely. Moreover, thereare available and commonlyadopted remediation methodsfor the potential contaminants.

7 sampling locationshave been proposed atparking area, oil drumstorage area and aroundthe site in general.Proposed parameters tobe tested are given inTable 6.1 of CAP.Sampling and testing areproposed to beconducted in Stage 2supplementary SI works.


Site RVehicleRepairWorkshop

(NOL/ERL/300/C/XRL/ENS/M57/016 of

Site AppraisalPast land uses aroundSSS was found to beoccupied as farms, carpark, garage andworkshop. The site iscurrently occupied asvehicle repairworkshop

Initial Contamination EvaluationPotential concern due to currentcar maintenance and servicingactivities.Possible ContaminantsPetroleum hydrocarbons, metalsand organic solvents.Possible Remediation Methods

The site has a small area(400m2) and would have onlybeen used for vehiclemaintenance. The areaoccupied by contaminativeactivities was found to beapproximately 100m2.

Land contamination causing

2 sampling locations areproposed at wastechemical containerstorage area and vehiclerepair area. An additional2 are proposed to assessthe site condition ingeneral.Proposed parameters tobe tested are given in






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CAP) Depending on the contaminatedsoil quantity and quality,possibly:


insurmountable impacts wouldnot be likely. Moreover, thereare available and commonlyadopted remediation methodsfor the potential contaminants.

Table 6.1 of CAP.A total of 4 samplingpoints are proposed to beconducted in Stage 2supplementary SI works

Site LVehicleRepairWorkshop


Site AppraisalPast land uses aroundSSS was found to beoccupied as farms, carpark, garage andworkshop. The site iscurrently occupied asvehicle repairworkshop

Initial Contamination EvaluationPotential concern due to past carmaintenance and servicingactivities.Possible ContaminantsPetroleum hydrocarbons, metalsand organic solvents.Possible Remediation MethodsDepending on the contaminatedsoil quantity and quality,possibly:


The site has a small area(200m2) and would have onlybeen used for vehiclemaintenance. The areaoccupied by contaminativeactivities was found to beapproximately 150m2.Land contamination causinginsurmountable impacts wouldnot be likely. Moreover, thereare available and commonlyadopted remediation methodsfor the potential contaminants.

2 sampling locations areproposed at the lube oildrum storage area andvehicle repair area.Proposed parameters tobe tested are given inTable 6.1 of CAPSampling and testing areproposed to beconducted in Stage 2supplementary SI works.






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Site FConstructionEquipmentRepair/MaintenanceWorkshop

(NOL/ERL/300/C/XRL/ENS/M57/102 ofCAR)

Site AppraisalPast land uses of thesite was found to befarms, workshop, carpark and garages. Thesite is currently usedas a ConstructionEquipment Repair/MaintenanceWorkshop.

Initial Contamination EvaluationPotential concern due to currentland use was identified. Phase 1SI has been conducted at theconstruction equipment repairarea, oil drum storage area andparking area. Supplementary SIunder Phase 2 will be carried outto assess the general sitecondition.Possible Contaminantspetroleum hydrocarbons, metals,Possible Remediation MethodsDepending on the contaminatedsoil quantity and quality,possibly:

Stabilization/solidification forheavy metals.Bioremediation such as bio-pile, composting or ex-situchemical oxidation for organiccontaminants.

The Site was occupied mainlyfor construction equipmentrepair / maintenance. Landcontamination causinginsurmountable impacts wouldnot be likely. Moreover, thereare available and commonlyadopted remediation methodsfor the potential contaminants.

A total of 3supplementary boreholeshave been proposed toassess the site conditionin generalProposed parameters tobe tested are given inTable 6.1 of CAPSampling and testing areproposed to beconducted in Stage 2supplementary SI works.


Site GScrap Yard

(NOL/ERL/300/C/XRL/ENS/M57/103 of

Site AppraisalPast land uses of thesite was found to befarms, workshop, carpark and garages. Thesite is currently used

Initial Contamination EvaluationPotential concern due to currentland use was identified. Phase 1SI has been conducted andSupplementary SI under Phase 2will be carried out to further

The Site was occupied mainlyfor scrap storage. Landcontamination causinginsurmountable impacts wouldnot be likely. Moreover, thereare available and commonly

A total of 2supplementary boreholeshave been proposed tofurther assess the sitecondition in generalProposed parameters to






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CAR) as scrap yard. assess the general site condition.Possible Contaminantspetroleum hydrocarbons, metals,organic solvents, PCB andcyanidePossible Remediation MethodsDepending on the contaminatedsoil quantity and quality,possibly:

Stabilization/solidification forheavy metals and cyanide.Bioremediation such as bio-pile, composting or ex-situchemical oxidation for organiccontaminants and PCB.

adopted remediation methodsfor the potential contaminants.

be tested are given inTable 6.1 of CAPSampling and testing areproposed to beconducted in Stage 2supplementary SI works.

Site QParking areawith minorvehiclerepair/maintenanceactivities

(NOL/ERL/300/C/XRL/ENS/M57/105 ofCAR)

Site AppraisalPast land uses of thesite was found to befarms, workshop, carpark and garages. Thesite is currently usedas Parking area withminor vehicle repair/maintenance activities.

Initial Contamination EvaluationPotential concern due to currentland use was identified. Phase 1SI has been conducted at wastecontainer disposal area andvehicle repair area.Supplementary SI under Phase 2will be carried out to furtherassess the general site condition.Possible Contaminants:Petroleum hydrocarbons, metalsand organic solvents.

The Site was occupied mainlyfor vehicle parking with someminor repair activities. Landcontamination causinginsurmountable impacts wouldnot be likely. Moreover, thereare available and commonlyadopted remediation methodsfor the potential contaminants.

A total of 2supplementary boreholeshave been proposed toassess the site conditionin general.Proposed parameters tobe tested are given inTable 6.1 of CAPSampling and testing areproposed to beconducted in Stage 2supplementary SI works






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CAR, RAP and RR

Possible Remediation MethodsDepending on the contaminatedsoil quantity and quality,possibly:


Site MOpen Area

(NOL/ERL/300/C/XRL/ENS/M57/018 ofCAP orNOL/ERL/300/C/XRL/ENS/M57/106 ofCAR)

Site AppraisalPast land uses of thesite was found to befarms, workshop, carpark and garages. Thesite is currently vacantwith an abovegroundtank of unknowncontent.

Initial Contamination EvaluationPhase 1 SI has been conductedto assess the general sitecondition and the potentialimpact due to the presence ofaboveground tank with unknowncontent. Supplementary SI underPhase 2 will be carried out tofurther assess the general sitecondition.Possible Remediation MethodsDepending on the contaminatedsoil quantity and quality,possibly:

Stabilization/solidification forheavy metals and cyanide.Bioremediation such as bio-pile, composting or ex-situchemical oxidation for organic

The Site was occupied mainlyan open area. Landcontamination causinginsurmountable impacts wouldnot be likely. Moreover, thereare available and commonlyadopted remediation methodsfor the potential contaminants.

A total of 3supplementary boreholeshave been proposed toassess the site conditionin general.Proposed parameters tobe tested are given inTable 6.1 of CAPSampling and testing areproposed to beconducted in Stage 2supplementary SI works






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contaminants and PCB.

Ventilation Building Sites/ Emergency Access PointSite D atMPVContainertruck parkingarea withminor repairmaintenanceactivities

(NOL/ERL/300/C/XRL/ENS/M57/013 ofCAP orNOL/ERL/300/C/XRL/ENS/M57/101 ofCAR)

Site AppraisalPast land uses of thesite was found to befarms, fish ponds andgarages. The site iscurrently used as acontainer truck parkingwith minor repair/maintenance activities.

Initial Contamination EvaluationPotential concern due to currentland use was identified. Phase 1SI has been conducted at areawith used container found andsupplementary SI under Phase 2will be carried out to assess thegeneral site condition and vehiclerepair area.Possible Contaminantspetroleum hydrocarbons, metalsand organic solvents,Possible Remediation MethodsDepending on the contaminatedsoil quantity and quality,possibly:


The area occupied mainly forvehicle maintenance. Landcontamination causinginsurmountable impacts wouldnot be likely. Moreover, thereare available and commonlyadopted remediation methodsfor the potential contaminants.

A total of 6 boreholeshave been proposed toassess the site conditionin general and the vehiclerepair area where minorrepair/maintenanceactivities would beundertaken.Proposed parameters tobe tested are given inTable 6.1 of CAPSampling and testing areproposed to beconducted in Stage 2supplementary SI works


Site E atMPVContainer

Site AppraisalPast land uses of thesite was found to be

Initial Contamination EvaluationPotential concern due to currentpainting process.

The site occupies an area of6,000m2 and would have onlybeen used for painting process.The area occupied by

A total of 5 samplinglocations have beenproposed at paint boothand around the site to






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truck parkingarea with carwash andpaint booth


farms, fish ponds andgarages. The site iscurrently used as acontainer truck parkingarea with car washand paint booth.

Possible ContaminantsPetroleum hydrocarbons, metalsand organic solvents.Possible Remediation MethodsDepending on the contaminatedsoil quantity and quality,possibly:


contaminative activities wasfound to be approximately150m2.Land contamination causinginsurmountable impacts wouldnot be likely. Moreover, thereare available and commonlyadopted remediation methodsfor the potential contaminants.

assess the potentialcontamination arousedfrom painting processand assess the sitecondition in general (2 atpaint booth and 3 aroundthe site)Proposed parameters tobe tested are given inTable 6.1 of CAPSampling and testing areproposed to beconducted in Stage 2supplementary SI works

Supporting Works AreasSite Hat KwaiChungScrap Yard

(NOL/ERL/300/C/XRL/ENS/M57/019 ofCAP orNOL/ERL/300/C/XRL/ENS/M57/107 of

Site AppraisalPast land uses of thesite was found to becar park, storage areaand vacant area.

Initial Contamination EvaluationPotential concern due to currentland use was identified. Phase1SI has been conducted at thescrap storage area andSupplementary SI under Phase 2will be carried out to furtherassess the general site conditionand the scrap packing area.Possible Contaminantspetroleum hydrocarbons,metals , PCB, cyanide andorganic solvents,

The Site was occupied mainlyfor scrap storage and packingwhere some oil drums werealso found. Landcontamination causinginsurmountable impacts wouldnot be likely. Moreover, thereare available and commonlyadopted remediation methodsfor the potential contaminants.

A total of 3 boreholeshave been proposed toassess the site conditionin general and the scrappacking area where someoil drums were found.Proposed parameters tobe tested are given inTable 6.1 of CAPSampling and testing areproposed to beconducted in Stage 2supplementary SI works






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CAR, RAP and RR

CAR) Possible Remediation MethodsDepending on the contaminatedsoil quantity and quality,possibly:

Stabilization/solidification forheavy metals and PCB.Bioremediation such as bio-pile and composting fororganic contaminants andcyanide.

Site T atMLWCar Park


Site AppraisalPast land uses of thesite was found to becar park and oil depot.The site is currentlyused as car park.

.

Initial Contamination EvaluationPotential concern due to pastindustrial use was identifiedPossible ContaminantsHeavy metals and petroleumhydrocarbons.Possible Remediation MethodsDepending on the contaminatedsoil quantity and quality,possibly:


The site has an area 4,000m2

occupied as car park. SinceHistorical land uses as a formeroil depot which had beendemolished around 30 yearsago and the current land usesas a car park was notconsidered to be landcontaminative. Landcontamination causinginsurmountable impacts wouldnot be likely. Moreover, thereare available and commonlyadopted remediation methodsfor the potential contaminants.

Specific hotspots werenot identified on site. 8boreholes are proposedto assess the sitecondition in general andthe potential impact dueto historical use as an oildepot.Proposed parameters tobe tested are given inTable 6.1 of CAP.Sampling and testing areproposed to beconducted in Stage 2supplementary SI works


Site J at NCB Site Appraisal Initial Contamination Evaluation The site occupies an area of A total of 8 sampling Same as Site I above.





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CAR, RAP and RR

ContainerYard


Past land uses of thesite was found to beopen sea and carpark. The site iscurrently used as acontainer yard.

Potential concern due to currentfuelling and oil drums storage.Possible ContaminantsPetroleum hydrocarbons, metals.Possible Remediation MethodsDepending on the contaminatedsoil quantity and quality,possibly:


25,000m2 and would have onlybeen used for container storagewith some fuelling activities andoil drums stored on site. Thearea occupied by contaminativeactivities was found to beapproximately 200m2. Landcontamination causinginsurmountable impacts wouldnot be likely. Moreover, thereare available and commonlyadopted remediation methodsfor the potential contaminants.

locations have beenproposed at the oil drumstorage area, fuellingarea and around the siteto assess the sitecondition in general.Proposed parameters tobe tested are given inTable 6.1 of CAP.Sampling and testing areproposed to beconducted in Stage 2supplementary SI works

Potential Contaminative Uses Outside Project SitesSite K nearLCWOpen Area


Site AppraisalPast land uses aroundLCW was open area,traffic roads and somevacant land. The siteis currently vacant.

Initial Contamination EvaluationPotential concern due to thechemical storage area at closeproximityPossible ContaminantsPetroleum hydrocarbons, metalsand organic solvents, PCB andcyanide.Possible Remediation MethodsDepending on the contaminatedsoil quantity and quality,

As observed, the chemicalstorage area located at Feoso’sbuilding was concrete paved.Contamination due to chemicalstored may not be significant.Land contamination causinginsurmountable impacts wouldnot be likely. Moreover, thereare available and commonlyadopted remediation methodsfor the potential contaminants.

Specific hotspots ofcontamination wereidentified on site atchemical storage area atclose proximity to theLCW site.1 sampling location isproposed to asses thepotential impacts due tothe nearby chemicalstore.Proposed parameters tobe tested are given in






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CAR, RAP and RR

possibly:Stabilization/solidification forheavy metals and PCB.Bioremediation such as bio-pile and composting fororganic contaminants andcyanide.

Table 6.1 of CAP.Sampling and testing areproposed to beconducted in Stage 2supplementary SI works

Consultancy Agreement No. NOL/ERL-300Environmental Impact Assessment of Hong Kong Section of

Guangzhou-Shenzhen-Hong Kong Express Rail LinkMTR Corporation Limited Environmental Impact Assessment Report


9.36 The corresponding responsible party for the above mitigation measures and supplementary siteinvestigation are provided in the implementation schedule of this EIA.

Evaluation of Residual Environmental Impacts

9.37 In terms of identified soil contamination, the proposed remediation methods would removecontaminated soils from the site through excavation followed by degradation of the contaminants tonon-toxic substances by biopiling/ ESCO. After completion of soil remediation for identifiedcontaminated areas, no residual impact in respect of land contamination on the future users isanticipated.

Conclusion

9.38 This land contamination assessment has examined the potential contaminative landuses within therelevant project area and their potential impacts to future use. The assessment involved siteappraisal, site investigation, assessment of contamination extent and where necessary formulationof remedial actions. No adverse impacts are identified for most of the sites within the project area.Only two sites with small amount of soil with bis-(2-Ethylhexyl)phthalate exceeding the relevantRBRBs are found. The volume of soil is only 90 m3 and treatment by biopiling/chemical oxidation isproposed to clean up the soil. Mitigation measures are proposed for the excavation of soil,treatment of soil and general environmental, health and safety on site during the construction stage.

9.39 There are some sites that are not accessible to conduct a detailed assessment or site investigationat this stage. An evaluation of the sites reveals that there are no insurmountable impacts identified.These sites will be followed up during or before the construction stage when the land is madeavailable for the assessment.

9. land contamination - environmental protection … report... · consultancy agreement no....

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