CONCLUSION

	A qualitative assessment on potential hazards associated with landfill gas migration from the SENT Landfill to the Extension and from the Extension to the adjacent existing and future developments.  Both landfills are considered as a "medium" source of gas migration due to the comprehensive and proven landfill gas control measures installed or to be installed.
	The source-pathway-target analysis shows that landfill gas risk posed by the SENT Landfill and the Extension is medium to high during both construction and operation phases within the Extension Site.  Whereas the risk posed by the Extension to the adjacent developments ranges from very low to low depending on the nature and location of the these developments.
	Underground rooms or void should be avoided as far as practicable at the infrastructure area at the Extension site.
	Other precautionary and protection measures during construction, design and operation/restoration phases of the Extension are recommended.
	It is expected that with the proposed precautionary measures in place, the potential risk of landfill has migration to the respective targets will be minimal.