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 8 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 |
Portable Biogas Analyzer IRCD4 (Serial
No. M230814007) |
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.