7.1
In
accordance with the updated EM&A Manual, monitoring of landfill gas (LFG)
is required for construction works within the Ma Tso Lung Landfill (MTLL, close
to KTN NDA) during the construction phase. This section presents the results of
landfill gas measurements performed by the Contractor. Appendix B shows the Limit Levels for the monitoring works.
7.2
The
MTLL is situated in the vicinity of the KTN NDA. A portion of the development
falls within the MTLL and its 250m Consultation Zone.
Monitoring Parameters and Frequency
7.3
Monitoring
parameters for Landfill gas monitoring include Methane, Carbon dioxide and
Oxygen.
7.4
According
to the mitigation measures of the updated EM&A Manual, measurements of the
following frequencies should be carried out according to the monitoring
requirements and procedures specified in Paragraphs 8.23 to 8.28 of EPD's
Guidance Note, “LANDFILL GAS HAZARD ASSESSMENT GUIDANCE NOTE”.
7.5
The
frequency of monitoring of LFG are conducted referring to the updated EM&A Manual
-Monitoring
of any LFG which may be migrated to the site should be undertaken during the
construction of infrastructure and the development within the Consultation Zone
and within MTLL when the works involve confined spaces. Routine gas monitoring
should be undertaken during groundwork construction and in all excavations.
Monthly gas monitoring should also be conducted for offices, stores etc. set up
on site.
7.6
Monitoring
of oxygen, methane and carbon dioxide was performed for construction of
infrastructure and the development within the Consultation Zone and within MTLL
when the works involve confined spaces.
In this reporting month, the area required to be monitored for landfill gas
are shown below and Figure 6 shows
the landfill gas monitoring locations.
Ø Excavation Locations: Portion
6b
Ø Manholes and Chambers: N/A
Ø Relocation of monitoring wells: N/A
Ø Any other Confined Spaces: Containers in Portion 6b
7.7
Table
7.1 summarizes the equipment employed
by the Contractor for the landfill gas monitoring.
Table 7.1 Landfill Gas Monitoring Equipment
|
Equipment |
Model and Make |
Quantity |
|
Portable gas detector |
Rasi 700 BIO (Serial
No. 330055) |
1 |
Results and Observations
7.8
In
the reporting month, landfill gas monitoring was carried out by the Contractor
at the aforesaid locations on 1 occasion with 6 monitoring stations. No Limit Level exceedance for landfill gas
monitoring was recorded in the reporting month. The monitoring results are
provided in Appendix J. Copies of
calibration certificates are attached in Appendix
C.
7.9
Should
any project related non-compliance of the criteria occur, action in accordance
with the Action Plan in Appendix N
would be carried out.