Agreement No. CE 35/2006(CE)
Kai Tak Development Engineering Study
cum Design and Construction of Advance Works
– Investigation, Design and Construction
Kai Tai Development
Environmental Monitoring and Audit Manual
Contents
9............ land
contammination. 9-1
9.1
Introduction. 9-1
9.2
Confirmation Sampling/
Testing. 9-2
9.3
Environmental
Mitigation Measures and Safety Measures. 9-2
9
land contammination
9.1
Introduction
9.1.1
The EIA study has
evaluated the potential land contamination issues for the Kai Tak Development
(KTD), which includes the review on the previous EIA studies and land
contamination assessment for the remaining areas within the former Kai Tak
Airport which have not
been assessed previously.
9.1.2
As revealed in the
Decommissioning of the Former
Kai Tak
Airport other than the
North Apron (KTA Decommissioning) EIA Report, the contaminated sites identified
were the South Apron area, the narrow strip of North Apron and the
ex-Government Flying Service (GFS) apron area. The identified
contamination (including TPH free product encountered during the site
investigation at the ex-GFS apron area) shall be remediated as recommended in
the KTA Decommissioning EIA Report and EM&A Manual.
9.1.3
Remaining areas within
the former Kai Tak Airport covered in the EIA study include the ex- GFS
building, the Radar Station, the “Hong Kong Aviation Club (HKAC) and an open
area for car parking and exhibition” (HKAC area) and the “Electrical and
Mechanical Services Department (EMSD) Headquarters excluding the external heavy
vehicle repairing workshop” (EMSD Headquarters).
9.1.4
For EMSD Headquarters,
EMSD, as the current occupant, should conduct a detailed land contamination
assessment and complete the necessary remediation prior to handing over the
site to the Government for redevelopment. If contamination is identified,
remediation of the site shall then be conducted following the respective
CAR/RAP upon EPD’s approval.
9.1.5
For Radar Station and
HKAC area, according to the site investigation conducted, no land contamination
impact was identified at the assessed area.
9.1.6
For land contamination
identified within the ex-GFS building, EIA study has recommended excavating the
contaminated soil from the proposed excavation zone within the ex-GFS building
area for carrying out soil treatment at the proposed decontamination works area
located at the northern part of the South Apron of the former Kai Tak Airport as shown in Figure 2.4.
9.1.7
The confirmation
sampling / testing shall be carried out by the Environmental Team (ET) for (i)
soil excavation (to ensure complete excavation of contaminated soil); (ii)
biopiling (to ensure attainment of cleanup targets); and (iii) solidification/
stabilization (to ensure attainment of cleanup targets). In addition,
independent environmental checker (IEC) shall carry out independent checking on
the above confirmation sampling/ testing for not less than 10% of total numbers
of samples and the scope shall cover sampling works and laboratory analysis by
an independent Hong Kong Laboratory Accreditation Scheme (HOKLAS) accredited
laboratory.
9.1.8
All contamination
identified at the ex-GFS building shall be remediated before commencement of
any decommissioning / construction works to avoid disturbance on the ground.
The duration of remediation shall be taken into account by the Project
Proponent and the Contractor as part of the construction programme.
9.1.9
In all cases,
contaminated soil remediation and treatment must be managed in an
environmentally sound manner, including compliance with all relevant
legislation and Government requirements.
9.2
Confirmation Sampling/ Testing
9.2.1
The details of sampling
and testing requirements, compliance assessment and event/action plan for soil
excavation, biopiling and solidification / stabilization for contamination
identified at ex-GFS building is presented in Section 4 of this EM&A
Report.
9.3
Environmental
Mitigation Measures and Safety Measures
9.3.1
For the remediation to
be conducted for the land contamination areas identified in the KTA
Decommissioning EIA, the mitigation measures recommended in the KTA
Decommissioning EIA Report as well as those stipulated in the corresponding
Environmental Permit should be implemented to control and minimize the
associated environmental impacts.
9.3.2
For two of the
remaining sites within the former Kai
Tak Airport
yet to be decommissioned namely the ex-GFS building and the Radar Station in
the South Apron area, the recommended mitigation measures are detailed in Section
4 of this EM&A Report.
9.3.3
For the areas outside
the former Kai Tak Airport boundary but within the boundary of the KTD,
findings from previous studies and the comprehensive review of current and
historical land uses conducted in this EIA study indicated that the urban area
as a whole did not have a major contamination problem but for specific hotspot
which might be of potential contamination concern. It is recommended that
the current occupier(s) or the 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.
9.3.4
The implementation for
the recommended land contamination mitigation measures is presented in Appendix A4.
In the event of exceedances or complaints, the Environmental Team and / or the
Contractor shall be responsible for reviewing the effectiveness of these
measures and for proposing, designing and implementing alternative measures as
appropriate.