7.1
In
accordance with the updated EM&A Manual, monitoring of landfill gas (LFG)
is required for the 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 was made reference
to the updated EM&A Manual - Monitoring of any LFG which may be
migrated to the site should be undertaken during construction of the 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 set up on site such as offices, stores etc.
7.6
Monitoring
of oxygen, methane and carbon dioxide was performed for the construction
of infrastructure and the development within the Consultation Zone and within
MTLL when the works involved 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 summarises 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 |
7.8
In
the reporting month, landfill gas monitoring was carried out by the Contractor
on 1 occasion at
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 non-compliance of the criteria occur, actions in accordance with the Event/Action
Plan in Appendix N would be carried out.