Table 8

Table 8.15 Construction-stage Impacts

Potential Impacts	Location	Source of impact		Receiver	Severity	Mitigation Required
Habitat loss	Terrestrial	Construction of sewer pipeline	Encroachment from construction works	Shrubland-grassland habitat on hillside	Minor	No
		Construction of sewer pipeline	Damage of tree roots or trunks	Rare and restricted tree species	Minor to moderate	Fencing of the trees. (detailed in below sections)
		Construction of STW	Encroachment from construction works	Shrubland-grassland habitat in disused quarry	Minimal to minor	No
		Construction of sewer pipeline and STW	Loss of feeding ground	Avifauna	Minor	No
		Construction of sewer pipeline and STW	Loss of feeding ground	Non avifauna	Minor	No
	Intertidal	Construction of sewer pipeline	Loss of intertidal habitats	Intertidal fauna	Minimal	No
		Platform for HDD	Supporting piles of the platform	Corals	No impact	No
		Platform for HDD	Supporting piles of the platform	Other marine organisms	Minor	No
	Subtidal	Construction of submarine outfall pipeline	HDD technique	Corals	No impact	No
	Subtidal	Dredging for diffuser	Loss of soft -bottom seabed	Benthic organisms	Minor	No
Construction dust	Terrestrial	Inhibition of vegetation growth and pollution of waterbodies		Adjacent terrestrial habitats	Minimal	No
Construction dust	Subtidal	Increase of turbidity of nearby coastal waters		Adjacent marine habitats	Minimal	No
Noise and Disturbance	Terrestrial, intertidal and subtidal	Changes in distribution, activity patterns or breeding success		Disturbance- sensitive wildlife species on and near the site	Minimal	No
Site runoff	Terrestrial	Deterioration of habitat quality		Romer’s Tree Frog site	Minimal*	Good site practices (detailed in below sections) (*Barriers in Pumping Station P2 site. Additional measures for Romer’s Tree Frog site though the impact is minimal.)
	Intertidal	Decrease water quality; bury and suffocate sessile organisms		Intertidal habitats	Minor
	Intertidal			Sandflat	No impact
	Subtidal	Decrease water quality; bury and suffocate sessile organisms; drive away mobile organisms		Adjacent marine habitats and dependent species	Minimal
Suspended solid	Subtidal	Decrease water quality; bury and suffocate sessile organisms; drive away mobile organisms		corals	No impact	Silt curtains and closed grab dredging are proposed in Section 5 of this report.
Contaminants	Subtidal	Effects on water quality		Marine organisms	No impact	Silt curtains and closed grab dredging are proposed in Section 5 of this report.
Drilling fluid	Subtidal	Effects on water quality		Marine organisms	No impact	Silt curtains is proposed in Section 5 of this report.