9.1.1 According to EIA Study Brief Section 3.4.9 and Appendix E2, the environmental impact due to land contamination within and at the vicinity of the Study Area, which is shown in Figure 9-1, shall be assessed. As land contamination impact assessments (LCIA) were carried out and reported in previously approved EIA reports, this land contamination impact study has reviewed and updated the previous LCIA. This follows from the requirement of the Study Brief that the approved EIA Report for KTD in relation to this Project shall be reviewed and shall identify and determine whether an updated S&STI is required as the Project is part of Kai Tak Development (KTD).
9.1.2 The Study Area, occupying an area of approximately 28.2 hectares, lies within the footprint of the former Kai Tak Airport and is dissected by Road D2. In accordance with the Study Brief, it will comprise a Main Stadium, a Public Sports Ground, an Indoor Sports Centre and other ancillary and supporting facilities such as car parking spaces, hotel, office area for sports-related organizations and a commercial area.
9.1.3 This land contamination impact study reviews relevant findings of LCIA in the approved EIA reports, including:
l EIA
Report for Kai Tak Airport North Apron Decommissioning (NAKTA) (Application No.:
EIA-003/1998)
l EIA
Report for Comprehensive Feasibility Study for the Revised
Scheme of South East Kowloon Development (SEKDCFS) (Application No.:
EIA-059/2001)
l EIA
Report for Kai Tak Development (KTD) (Application No.:
EIA-157/2008)
9.1.4 An updated land contamination impact assessment has been performed, following the criteria and guidelines for evaluating and assessing the land contamination impact as stated in Sections 3.1 and 3.2 of Annex 19 of the Technical Memorandum (TM) of Environmental Impact Assessment Ordinance (EIAO).
9.2.1
In
this Study, land contamination assessment in the NAKTA Decommissioning EIA
(Application No.: EIA-003/1998), SEKDCFS EIA (Application No.: EIA-059/2001)
and KTD EIA (Application No.: EIA-157/2008) were reviewed in accordance with
the EIA Study Brief (ESB-274/2014). Additional information was also obtained
through desktop review to further update the findings.
9.3.1
The
MPSC Site is part of the previous Kai Tak Airport which was formed by
reclamation. Kai Tak Airport served as international airport of Hong Kong from
1925 until 1998. The aerial photographs of Kai Tak Airport are shown in Figures 12-3-2, 12-3-3 and 12-3-4. The international airport moved to
Chek Lap Kok in 1998.
9.3.2
Since
the closure of the international airport in 1998, there have been various
temporary uses housed in Kai Tak Area, such as Temporary Government Offices,
temporary storage and tests for recycled aggregates, temporary recreation
facilities and temporary car parks and temporary storage. Subsequently, the
Cruise Terminal and public housing estates were developed. However, the MPSC
Site was mainly used as temporary car park. Panoramic view of former Kai Tak
Airport Site (2010) is shown in Photo No. 9-3-1 and aerial photo of the MPSC Site taken in 2013 is shown in Photo No. 9-3-2.
9.3.3
Recently,
the MPSC Site and the surrounding area are used as temporary car park,
construction storage and construction sites. A recent aerial photograph is
shown in Photo No. 9-3-3.
9.4.1
The
NAKTA Decommissioning EIA (Application No.: EIA-003/1998) was completed in
April 1998 and approved under the EIAO in September 1998. The land
contamination impact assessment of the NAKTA Decommissioning EIA covered the
North Apron of the former Kai Tak Airport (NAKTA) and the vicinity of the NAKTA
area, see Appendix 9A and Figure
9-2.
Review of the Kai Tak Airport site history was done by Maunsell Consultants
Asia Ltd. in 1996 including records of historical leakage from the hydrant fuel
system within the airport apron provided by Oil Companies Tank Farm (OCTF). The
land uses with potential land contamination impact were identified.
9.4.2
A
detailed site investigation within the Kai Tak Airport had been undertaken by
Maunsell Consultants Asia Ltd. in 1997 to ascertain the nature, scale and
extent of possible ground contamination resulted from known leaks of aviation
fuels. The investigation was carried out in two phases and results of the
investigations indicated that remediation is required at some areas within
NAKTA including the Project Area, see Appendix
9B and
Figure 9-3.
9.4.3
An Environmental
Permit was obtained for Kai Tak Airport North Apron Decommissioning. The
identified contaminated areas at the NAKTA had been cleaned up during the
period from 1998 to 2007 in accordance with the Environmental Permit
conditions. The permit holder, Territory Development Department (now Civil
Engineering and Development Department), had implemented and completed all
necessary works for decommissioning accordingly.
9.4.4
The
SEKDCFS EIA (Application No.: EIA-059/2001) was completed in July 2001 and approved
under the EIAO in September 2001. The SEKDCFS EIA reviewed two relevant studies
namely
l
EIA for the South East Kowloon Development Feasibility Study (SEKDFS)
l
The NAKTA Decommissioning EIA, providing the background information for
assessment of land contamination impact under the EIA study.
9.4.5
The
SEKDFS Final EIA Report was completed in November 1998 and was administratively
endorsed by the Environmental Study Management Group of SEKDFS. However, the
application for approval of the SEKDFS Final EIA Report under the EIA Ordinance
was withdrawn on 17 March 1999 before public inspection of the report. The
SEKDFS Final EIA Report is therefore not in the EIA Ordinance Register,
however, it is reviewed under SEKDCFS EIA.
9.4.6
According
to the SEKDCFS EIA, SEKDFS EIA reviewed and assessed the land contamination
impacts of an area larger than and including the entire assessment area,
covering the former Kai Tak Airport and the urban area in Kowloon City, Ma Tau
Wai, Ma Tau Kok and Hunghom. The land contamination impact assessment was
started with preliminary investigation by site visits, questionnaire survey and
information review. A site investigation (SI) was carried out in February 1997
to obtain and review the general baseline conditions for future development. These
urban areas as a whole did not have any major contamination problem, however,
there were existing specific hotspots which might arouse potential land
contamination concerns. These hotspots are outside the Project Area and lie
within the urban area in Kowloon City, Ma Tau Wai, Ma Tau Kok and Hunghom.
Potentially contaminative land uses in the urban areas in the close proximity
to the Project Area included only the Electrical and Mechanical Services
Department (EMSD) workshops at Sung Wong Toi Road, which are outside the Study
Area as shown in Figure 9-4. The SEKDCFS EIA Report recommended focused
land contamination assessment for local industries or installations should be
carried out on a case by case basis where redevelopment is proposed.
9.4.7 The KTD EIA Report (Application No.: EIA-157/2008) was completed in October 2008 and approved under the EIAO in March 2009. This EIA has reviewed three previous relevant studies, namely NAKTA Decommissioning EIA, SEKDCFS EIA and EIA on Decommissioning of the former Kai Tak Airport other than the North Apron (KTA Decommissioning EIA) to provide background information for assessment of land contamination impacts under this EIA study. The KTD EIA has also assessed the potential land contamination concern for the construction of new distributor roads, sewage pumping station and decommissioning of the remaining parts of the former Kai Tak Airport. Based on the findings of this EIA, the contaminated areas at the NAKTA including the areas of this Project have been cleaned up during the period from 1998 to 2007 in accordance with the Environmental Permit conditions of NAKTA EIA. There would not be further concerns over the historical contamination from the former Kai Tak Airport.
9.4.8 The KTD EIA had also updated the conditions of the urban areas outside the former Kai Tak Airport based on SEKDCFS EIA Study and the EMSD workshops at Sung Wong Toi Road was identified as a potential contaminative land use requiring land contamination investigation and the remediation works (if any) has to be undertaken by the occupant of the workshop.
9.4.9 A summary of site investigation findings reviewed in the above three EIA reports and the relevant Contamination Assessment Plan (CAP), Contamination Assessment Report and/or Remediation Action Plan (CAR/RAP) is given in Table 9-1.
Table 9-1 Summary
of Findings in Relevant EIA Reports
|
Relevant EIA |
Site Investigation Findings |
Date of Approval |
|
NAKTA Decommissioning
EIA |
||
|
NAKTA Decommissioning EIA |
l
195 boreholes and 77 groundwater wells were
installed for soil and groundwater contamination assessment. l
Land Contamination hotspots were identified.
Elevated levels of methane and anaerobic conditions were found in some areas. l
The identified contaminated areas at the NAKTA
had been cleaned up during the period from 1998 to 2007 in accordance with
the Environmental Permit conditions. |
September 1998 Application No.: EIA- |
|
CAP, CAP/RAP for South East Kowloon
Development Infrastructure at North Apron Area of Kai Tak Airport |
l
Accessed areas within NAKTA which were not
covered in NAKTA decommissioning project due to accessibility issue. l
134 boreholes were constructed for the purpose
of land contamination assessment. l
Remediation were found to be necessary at 15
borehole locations with soil samples contaminated with metals, Benzo(a)pyrene
and Total Petroleum Hydrocarbons (TPH) exceeding Dutch B/C levels. Findings
from groundwater risk assessment indicated that the risk level associated
with groundwater during construction was acceptable and no remediation for
groundwater would be necessary. Free product, identified at one of the
groundwater sampling wells, however, required remediation. l
Solidification / stabilization and biopiling
were recommended as the remediation method for metal contaminated soil and
organic contaminated soil respectively whereas free product recovery was
recommended for groundwater remediation. |
CAP: June 2003 CAR/RAP: October 2005 |
|
Remediation Report for South East Kowloon
Development Infrastructure at North Apron Area of Kai Tak Airport |
l
The Remediation works were conducted according
to the CAR/RAP of South East Kowloon
Development Infrastructure at North Apron Area of Kai Tak Airport under
Contract No. KL39/03 approved by EPD in 2005. l
Free product found in the groundwater
monitoring well was manually skimmed off. For soil remediation, cement
solidification / stabilization (CSS) was implemented for heavy metal
contaminated soil and biopiling was operated for organic contaminated soil as
proposed in the approved CAR/RAP. The remediation works were conducted in the
period from December 2005 to March 2007. |
August |
|
SEKDCFS EIA |
||
|
SEKDCFS EIA |
l
Reviewed SEKDFS EIA (not in the EIA Ordinance
Register) and NAKTA Decommissioning EIA. l
Identified potential contamination hotspots
both within and outside former Kai Tak Airport. Area outside former Kai Tak
Airport includes urban area in Kowloon City, Ma Tau Wai, Ma Tau Kok and
Hunghom. The potential hotspots within the Project Site were referred to in
NAKTA Decommissioning EIA. |
September 2001 Application No.: EIA- |
|
KTD EIA |
||
|
KTD EIA |
l
Reviewed and assessed the implications of land
contamination associated with the former Kai Tak Airport. l
Assessed the potential land contamination
concern for the construction of new distributor roads, sewage pumping station
and decommissioning of the remaining parts of the former Kai Tak Airport. l
Updated the conditions of the urban areas
outside the former Kai Tak Airport. l
Identified the EMSD workshops at Sung Wong Toi
Road as a potential contaminative land use. |
March Application No.: EIA- |
9.5.1 According to the Project development plan as shown in Figure 9-1, the proposed development includes the following:
l Main
Stadium
l Public
Sports Ground
l Indoor
Sports Centre
l Hotel
Block
l Office
Block
l Retail
Area
9.5.2
There
will not be any potential contaminative land uses within the Study Area.
9.5.3
Potentially
contaminative land uses in the urban areas in the proximity to the Project area
included only the EMSD workshops at Sung Wong Toi Road. The finding is provided
in Table 9-2 below and as shown in Figure 9-4.
Table 9-2 Information on the EMSD Workshops at Sung Wong Toi Road (Extracted from
KTD EIA)
|
Potentially Contaminative Uses |
Location |
General Information |
Possible/Potential Sources of
Contamination |
|
EMSD Sung Wong Toi Vehicle Repair and
Maintenance Workshop |
Sung Wong Toi Road |
l Activities: government vehicle
repairing and maintenance; and l Long history of operation |
l A large underground waste oil tank
and a diesel storage tank were identified; l Battery cell, flammable liquid,
oil sludge, acidic/alkaline electrolytes, solvents, mineral/lube oil,
refrigerants, paints, heavy metal compounds, paints and scrap metal have been
used, stored or generated; and l Waste disposal and oil & fuel
storage generally follows government environmental requirements at present. |
9.5.4
The
potential contamination should be dealt with by the relevant operator, i.e.
EMSD separately. According to EMSD, decontamination works was completed in
September 2012, except for one bore hole which could not be completed due to
obstructions by underground utilities and building structures. Decontamination
and remedial works of the remained borehole is included in the scope of the
demolition programme.
9.6.1
In
accordance with the findings of the EIA reports reviewed, the contaminated
areas at the NAKTA including the area of the Project have been cleaned up
during the period from 1998 to 2007 according to Environmental Permit
(EP-007/1998) conditions. There would not be further concerns over the
historical contamination from the former Kai Tak Airport.
9.6.2
For
areas in the proximity to the Project Site referred to in South East Kowloon,
the EMSD Sung Wong Toi Vehicle Repair and Maintenance Workshop located at about
50 metres away from the Project Area is identified as a potential contamination
source. A land contamination assessment will be undertaken by EMSD according to
the approved KTD EIA Report. Based on the EIA studies reviewed, the potential
contaminative sources identified in the urban area would not have a major
contamination problem and there might only be potential land contamination
concern at specific hotspots, therefore, the impact of land contamination
aroused from EMSD workshop on the Project is also considered to be unlikely.
9.6.3
According
to Site Contamination Assessment Report of Agreement No. 9AT 034 – Provision of
Consultancy Services to facilitate the preparation of the Technical Feasibility
Statement and carry out related studies for the Multi-purpose Stadium Complex
at Kai Tak Kowloon City District (AECOM 2010), some temporary industrial
activities, including a concrete batching plant, an electrical substation and a
metal pieces and construction materials collection point, were found at the
southwestern portion of the Project Area during site inspection undertaken on
11 August 2009 by AECOM. The locations of potential contaminated site
identified within/at close proximity to the Project Area is shown in Figure 9-5. The soil contamination implications are discussed as follow:
l
A typical concrete batching plant
consists of associated structures and facilities to handle cement, sand,
aggregate, water and ice for supply of concrete. Concrete batching plant is a
construction material manufacturing plant, instead of chemical
manufacturing/processing plant. A typical concrete batching plant is shown in
Appendix A to PNAP255 (APP-120), included in Appendix 9C. In general, all water within the concrete batching
plants are recycled. Normally concrete batching plants would not cause any land
contamination.
l
For the metal pieces and
construction materials collection point in the Project Site, it is a place of
collecting metal pieces and construction materials, instead of metal workshops.
The collected metal and steel reinforcement are normally delivered to other
factories for recycling. Therefore, no soil contamination is expected in the
Project Site.
l
For the electric substation in
the Project Site, most of the equipment such as switchgear, LV board, cable,
metering and panel, are no potential land contamination. Those oil filled
transformers are confined with metal casing. According to Code of Practice No.
101 for Distribution Substation Design issued by CLP Power Hong Kong Limited,
see Appendix 9D. All substations on ground level
are 150mm above the outside ground level. Both the floor slab and cable trench
are concrete paved thus potential contamination of soil under the substation is
unlikely to be happen.
l
According to the latest records
from EPD, there was no spillage/leakage record in the past within the concerned
areas. Based on the findings of site observation done by AECOM, the concerned
areas were observed to be concrete paved in general without apparent stains
observed. Therefore, no soil contamination is expected in the Project Site.
9.6.4
According
to information provided by ArchSD, the site was separated into the following
uses since 2010:
l
Open carpark,
l
Works Area for CEDD, and
l
Concrete paved area.
The aerial photographs of MPSC Site
as in 2013 and 2014/15 are shown in Photo No. 9-3-2 and 9-3-3 respectively.
9.6.5
There
should not be any soil contamination caused by these uses.
9.7.1
Potential
land contamination impacts associated with the construction of the Project at the north
apron of the former Kai Tak Airport have been assessed, and no potential
contamination are expected as the Project includes only sports facilities,
hotel, office and retail area.
9.7.2
No
historical contamination concern from the former Kai Tak Airport was identified
within the Project Area since the completion of clean up remediation works at
NAKTA. Findings from previous studies indicated that some temporary industrial
activities were found at the southwestern portion of the Project Area including
a concrete batching plant, an electrical substation and a metal pieces and
construction materials collection point. As explained in Section 9.6.3, the concrete batching plant and the metal pieces and
construction materials collection point will not cause any soil contamination.
The electrical substation was found on concrete paved area in general without
apparent stains observed during site inspection done by AECOM, and no oil
spillage was recorded by EPD, thus no soil contamination would be caused by
such use. Therefore, no soil contamination is expected in the Project Site.
9.7.3
For
potential contaminative sources identified close to the Project Site in South
East Kowloon, namely the EMSD Sung Wong Toi Vehicle and Maintenance Workshop, a
land contamination assessment will be undertaken by EMSD according to the
approved KTD EIA Report. As these facilities are outside the Project Site, no
land contamination impacts to the Project is expected.
9.7.4
For
the areas outside the Project Site in Kai Tak Development, findings from
previous studies indicated that the urban area as a whole did not have a major
contamination problem except for a few specific hotspots which lie in urban
areas in Kowloon City, Ma Tau Wai, Ma Tau Kok and Hunghom. As precautionary
measure to minimize any potential environmental impacts associated with these
potential land contaminations, it has been recommended that the current
occupant(s) or future developer(s) of those identified hotspots should carry
out detailed land contamination investigations prior to any redevelopment. If
land contamination is confirmed, proper remedial measures should be formulated
and implemented prior to the redevelopment of the respective site.
9.8.1 The potential environmental issues associated with land contamination together with its implication to the Project have been reviewed and assessed. There are no potential contaminative uses in the proposed Project development.
9.8.2 The assessments of land contamination for the former Kai Tak Airport have been completed in the relevant approved EIA Reports. Land contamination identified in the North Apron had been cleaned up already.
9.8.3 Based on the reviewed findings from the previous EIA studies, potentially contaminative land uses in the urban areas in the proximity to the Project Area included only the EMSD Sung Wong Toi Vehicle and Maintenance Workshop. A land contamination assessment will be undertaken by EMSD according to the approved KTD EIA Report. As these facilities are outside the project Site, no land contamination impacts to the Project are expected.
9.8.4 Urban area outside the Project site was found not having any major contamination problem but for specific hotspots which lie in urban areas in Kowloon City, Ma Tau Wai, Ma Tau Kok and Hunghom, which might be of potential contamination concerns.
9.8.5 Based on the reviewed findings, some temporary industrial activities were found at the southwestern portion of the Project Area including a concrete batching plant, an electrical substation and a metal pieces and construction materials collection point. These uses were observed to be concrete paved in general without apparent stains observed during site inspection undertaken by AECOM. No spillage leakage record in the past within the concerned area occurred according to the latest records from EPD.
9.8.6 No further investigation on land contamination within Project Site is necessary.