8.1.1.1
This section presents the potential
implications of land contamination associated with the Project.
8.2.1.1
The relevant environmental guidelines and
standards on land contamination aspect include the following:
•
Technical Memorandum on Environmental
Impact Assessment Process (EIAO-TM)
•
Guidance Note for Contaminated Land
Assessment and Remediation (Guidance Note)
8.2.1.2
The Guidance Note sets out the
requirements for proper assessment and management of potentially contaminated
sites such as oil installations (e.g. oil depots, petrol filling stations), gas
works, power plants, shipyards / boatyards, chemical manufacturing / processing
plants, steel mills / metal workshops, car repairing / dismantling workshops
and scrap yards. In addition, this Guidance Note provides guidelines on how
site assessments should be conducted and analysed and suggests practical
remedial measures that can be adopted for the clean-up of contaminated sites.
•
Practice Guide for Investigation and
Remediation of Contaminated Land (Practice Guide)
8.2.1.3
This guide outlines typical investigation
methods and remediation strategies for the range of potential contaminants
typically encountered in Hong Kong.
•
Guidance Manual for Use of Risk-based
Remediation Goals for Contaminated Land Management (Guidance Manual)
8.2.1.4
The Guidance Manual introduces the risk
based approach in land contamination assessment and present instructions for
comparison of soil and groundwater data to the Risk-Based Remediation Goals
(RBRGs) for 54 chemicals of concern commonly found in Hong Kong. The RBRGs were derived to suit Hong Kong
conditions by following the international practice of adopting a risk-based
methodology for contaminated land assessment and remediation and were designed
to protect the health of people who could potentially be exposed to land
impacted by chemicals under four broad post restoration land use categories.
The RBRGs also serve as the remediation targets if remediation is necessary.
8.3.1.1
The following tasks have been undertaken
to identify any potentially contaminated areas:
•
Desktop study to review the current and
historical land uses; and
•
Site reconnaissance to identify
potentially contaminated areas as necessary.
8.3.1.2
To facilitate the land contamination
assessment, the following sources of information have also been collated and
reviewed:
•
Aerial photographs from Survey and
Mapping Office of Lands Department;
•
Records (if any) on dangerous goods
(DGs), chemical wastes, chemical spillage/leakage and fire incidents from
Environmental Protection Department (EPD) or Fire Services Department (FSD);
•
Photographs from site visit;
•
Preliminary Environmental Review – Final
Report, Agreement no. PW 1/2006 Lei Yue Mun Waterfront Enhancement Project –
Preliminary Environmental Review and Marine Traffic Impact Assessment,
Meinhardt Environment Limited, 2007;
•
2011 Updated Preliminary Environmental
Review (Draft), Agreement no. PW 1/2006 Lei Yue Mun Waterfront Enhancement
Project – Preliminary Environmental Review and Marine Traffic Impact
Assessment, Meinhardt Environment Limited, 2011;
•
Site Investigation Report, EDD Contract
No. 10/GCO/83 W.O. PW7/2/11.89 Public Toilet & Bathhouse at Lei Yue Mun,
Gammon (Hong Kong) Limited, 1985;
•
Final Fieldwork Report, ASD Contract No.
TC R311 W.O. ASD 010746 Lei Yue Mun Waterfront, Geotechnics & Concrete
Engineering (Hong Kong) Ltd, 2008; and
•
Final Fieldwork Report, GE/2011/06 W.O.
GE/2011/06.3 Existing Footpath Leading to Tin Hau Temple at Lei Yue Mun, VIBRO
(H.K.) Ltd.
8.4.1.1
The Site is located at the waterfront
immediately in front of the village houses of the Lei Yue Mun villages and lies
outside the eastern extent of the Victoria Harbour and located at east of the
Lei Yue Mun lighthouse. The location and
the extent of the Site
(including all work areas associated with the Project) is illustrated in Figure 1.1.
8.5.1
Review of Historical Land Use
8.5.1.1
A review of aerial photographs has been
undertaken to evaluate the likelihood of potential contamination associated with
past land uses within the Site. The development history of the Site is summarised in Section 8.5.1.2
and the list of aerial photographs reviewed is shown in Table 8.1. Selected aerial photos are provided in Appendix 8.1.
Table 8.1 Aerial
Photographs Reviewed
|
Year
|
Height (Feet)
|
Photograph
Reference Number
|
|
1963*
|
2,700
|
5235
|
|
1973*
|
2,000
|
6661
|
|
1976
|
4,000
|
12582
|
|
1978*
|
4,000
|
23910
|
|
1982
|
3,000
|
43002
|
|
1985
|
5,000
|
CN862
|
|
1989
|
2,000
|
A16374
|
|
1993*
|
4,000
|
CN4593
|
|
1995
|
4,000
|
CN12619
|
|
1998
|
2,500
|
CN20957
|
|
2003*
|
4,000
|
CW47662
|
|
2005
|
4,000
|
CW66236
|
|
2009
|
3,000
|
CW83618
|
|
2013
|
2,000
|
CW102952
|
|
2016*
|
6,000
|
CS54247
|
Note:
* Aerial Photos are provided in Appendix 8.1.
8.5.1.2
The Site was generally occupied by
cultivations, a pond, some village type housings (on the hill side) and beaches
since 1963. No significant change in
land uses was observed until 1973. In
1973, the cultivations were abandoned and additional village type housings were
observed along the coast line. In 1978,
the pond was backfilled and Lei Yue Mun Rest Garden was observed. No significant change in land uses within the
Site was observed since then. No potentially contaminating land uses, such as
shipyard / boatyards and vehicle repairing / maintenance, were observed in the
review.
8.5.2.1
Based on the site investigation report
and fieldwork reports mentioned in Section 8.3, the Site is majorly underlain
by 0.10m to 0.20m thick of concrete surface overlaying fill with thickness of
0.32m to 5.90m and marine
deposit (1.50m to 5.0m thick) which alluvium (2.70m thick) was encountered beneath. Saprolitic
soil and weathered rock are encountered beneath either fill, marine deposit or
alluvium in the Site area. Grade lV or V granite is encountered
between +0.78mPD and -22.22mPD. Bedrock
of moderately decomposed and slightly decomposed medium grained granite (Grade
lll or better granite) is encountered between +3.77mPD and -22.51mPD.
8.5.3
Acquisition of Information from
Government Departments
8.5.3.1
The EPD and
FSD have been contacted for (i) records on any leakage/spillage of chemicals
and chemical waste, (ii) records of DGs, (iii) records of Chemical Waste
Producer(s) and (iv) records of reported fire incidents within the Site. EPD
and FSD’s replies on the requests have been received and attached in Appendix 8.2 and 8.3 respectively. Information is summarized below.
Environmental Protection Department
8.5.3.2
According to
the information provided by EPD, there are no records of chemical waste producer
and spillage/leakage of chemicals and chemical wastes at the Site.
Fire Services Department
8.5.3.3
According to
the information provided by FSD, there are no records of DGs, fire incidents
and spillage/leakage of chemical at the Site.
8.5.4
Site Reconnaissance
8.5.4.1
Site walkover was conducted on 21 June
2016 to investigate any contaminative issues associated with current land uses
and activities within the Site. In order
to provide a clear picture of the current site condition, the Site is divided
into 5 regions to illustrate the current land uses and activities observed
during site reconnaissance and the photo records of site reconnaissance are
provided in Figure 8.1
to Figure 8.1E.
Additionally, site walkover checklist is provided in Appendix
8.4.
8.5.4.2
Based on the site observations, restaurants
were observed alongside the pedestrian walkway. In the middle section of Region
A, a lookout point and rest area were observed at northwestern side of the Region A. No contaminating
activities were identified and no oil stains and/or stressed vegetation were
observed.
8.5.4.3
Based on the
site observations, a lookout point and viewing platform were observed at the
northwestern side of Region B. A beach and Lei Yue Mun Rest Garden were noted
on the southwestern and southeastern side of Region B respectively. No contaminating activities and land
uses, such as shipyards / boatyards and vehicle repairing / maintenance
workshops, were identified and no oil stains and/or stressed vegetation were
observed.
8.5.4.4
Based on the
site observations, a beach and public facilities, such as basketball court and
Lei Yue Mun Ma Wan public toilet cum bathhouse, were observed at the southwestern
and southeastern side of Lei Yue Mun Rest Garden respectively. Along the
pedestrian walkway in Region C, village houses were noted on both sides. No
contaminating activities and land uses, such as shipyards / boatyards and
vehicle repairing / maintenance workshops, were identified and no oil stains
and/or stressed vegetation were observed.
8.5.4.5
Based on the
site observations, village houses were observed along the pedestrian walkway in
Region D. No
contaminating activities and land uses, such as shipyards / boatyards and
vehicle repairing / maintenance workshops, were identified and no oil stains
and/or stressed vegetation were observed.
Region E (Refer to Figure 8.1E)
8.5.4.6
Based on the
site observations, village houses were observed along the pedestrian walkway in
Region E. No contaminating activities and land uses, such as shipyards /
boatyards and vehicle repairing / maintenance workshops, were identified and no
oil stains and/or stressed vegetation were observed.
8.6.1.1
Based on the site appraisal results, no
potentially contaminating land use / activities were identified in the
Site. Therefore, no land contamination
impact associated with present and past land uses/activities is
anticipated.
8.7.1.1
Since no land
contamination impact is anticipated, no environmental monitoring and audit
programme would be required.
8.8.1.1
Based on the
findings of site appraisal within the Site, no contaminating land use /
activities were identified in the Site and adverse land contamination impact
arising from Project is not anticipated. Thus, no Contamination Assessment Plan
/ Contamination Assessment Report / Remediation Assessment Plan and EM&A
are required to be prepared.