g4 Per Deis Appendix f2 Consolidated Env Risk Assessment

8/18/2019 g4 Per Deis Appendix f2 Consolidated Env Risk Assessment

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Gorgon Gas Development Fourth Train Expansion Proposal App F2

Appendix F2: Consolidated Risk Assessment Results


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App F2 │ Appendices

© Chevron Australia Pty Ltd

Document #: G4-NT-REPX0000116 PublicPage 1

Revision Date: June 2014

Consolidated Risk Assessment Results: Impacts to atmosphere

C L R C L R

Air Quality

1 Air qua li ty Atm os pher ic emi ss ions

(except dust)

Reduction in air quality, resulting in

exceedance(s) in air quality criteria

During construction of the Fourth Train

Proposal emissions of atmospheric

pollutants and air toxics including NOx,

SOx, particulates, CO and NMVOCs from

activities or infrastructure such as

machinery, marine vessels, vehicles and

equipment with combustion engines,

spraying/painting with primer, welding

and coating, power generation, shipboard

incineration and flaring during well

completion or workover.

LOW Same emissions types and sources as Foundation

Project. Volumes emitted likely to be the same or

less than Foundation Project (due to scale of

activity). Will be short duration during

construction phase and occurring over several

widely dispersed sites. Impact is not expected to

be any different or greater than that of the

Foundation Project so no change to risk.

6 4 LOW 6 4 LOW _


(except dust)

Reduction in air quality, resulting in


Emissions of atmospheric pollutants and

air toxics including NOx, SOx, particulates,

CO and NMVOCs from the operation of

the Fourth Train Proposal including

commissioning and start-up, operational

process emissions (such as flaring),

supporting utilities and subsidiary

infrastructure and vehicles.

LOW Fourth Train Proposal emissions types will be the

same as those expected for the Foundation

Project but will be only a third of that predicted

for the Foundation Project. Incremental risk is

therefore same or lower than Foundation Project.

6 4 LOW 6 3 LOW _


(except dust)

Contribution of VOCs to regional

ozone formation. Potential

exceedance of local occupational

health exposure standards under

certain weather conditions.

Emission of VOCs produced during

operation of the gas treatment plant,

including acid gas venting and loading of

additional condensate produced by the

Fourth Train Proposal

LOW Fourth Train Proposal will generate additional

condensate loading activities but incrementally,

these are predicted to be a third less than those

anticipated for the Foundation Project. No change

in risk

6 4 LOW 6 3 LOW _

4 Air quality Fire Reduction in air quality from smoke

and particulates of fire

Smoke and particulates generated by fire

caused by accidental ignition during

construction activities, such as hot works

(cutting, welding, grinding), sparks from

vehicle exhausts and personnel smoking.

LOW Increase in the number of ignition sources. 5 4 LOW 5 4 LOW _

9 Air quality Dust Reduction in air quality, resulting in


Construction activities including clearing

and earthworks, additional vehiclemovements on unsealed roads,

installation of the onshore Feed Gas

Pipeline System and concrete batching.

LOW Additional clearing and earthworks, and an

additional onshore Feed Gas Pipeline System.Majority of roads that will be used will be sealed

by the time work on the Fourth Train Proposal

begins.

6 5 TRIVIAL _ _ _ _

Incremental Additional

Residual ImpactFoundation

Project Risk

Change introduced by Fourth Train ProposalPotential ImpactAffected

Environmental

Factor

CommentsActivityStressorLine Item


3/49





Consolidated Risk Assessment Results: Impacts to the Terrestrial EnvironmentPotential Impact Activity Comments

C L R C L R

Soils and landforms

1 Soils and

landforms

Vegetation clearing and

earthworks

Change in physical landform from

earthworks and from wind, water

erosion

Change in natural drainage regimes (at

shore crossing site)

Degradation of areas vulnerable to

wind and water erosion (e.g. dune

systems around shore crossing site,

shore end of the onshore pipeline,

open trenches, open site areas and

drainage channels)

Vegetation clearing, stripping and

storage of topsoil

Earthworks within the Foundation

Project footprint, and over up to 10 ha of

previously uncleared land

MEDIUM Approximately 10 ha of additional land clearing

and earthworks at shore crossing.

Up to 10 ha of additional re-clearing and

earthworks at the Foundation horizontal

directional drilling site (area already subject to

Foundation Project earthworks).

Up to 32 ha of additional earthworks at the

Additional Support Area (area already cleared and

levelled).

Impacts on landform affect shore crossing sites

and Additional Support Area.

Extended duration of construction

6 2 LOW 5 1 MEDIUM _

2 Soils and

landforms


earthworks

Loss and/or compaction of topsoil and

change in soil vertical profile and

physical characteristics

Vegetation clearing, stripping and

storage of topsoil

Excavation, re-filling of foundations,

pipeline trench

LOW Approximately 10 ha of additional land affected at

shore crossing.





Approximately 50 ha of additional earthworks

mainly within the existing approved F oundation

Project Gas Treatment Plant site (area alreadycleared and levelled).



levelled).

Additional trenching along Feed Gas Pipeline

System RoW.

Extended duration of construction

5 5 LOW 5 5 LOW _

3 Soils and

landforms

Fire Change in soil quality resulting from

runoff containing nutrients and

chemicals

Runoff from water and foam used for fire

control during construction or operation

of terrestrial facilities

- Extended duration of construction activities that

have potential to ignite fire

Additional inventory of combustible materials

Extension of physical footprint by approximately

10 ha

5 6 TRIVIAL _ _ _ Likelihood of this impact occurring

considered 'rare' based on experience from

Foundation Project and mitigation

measures in place

4 Soils and

landforms

Spills and leaks Contamination of soil Pr ecommis sioning leaks and spills ,

including loss of saline water during

hydrotesting of Feed Gas Pipeline System

pipestring or LNG tank, hydraulic fluids

LOW Additional Feed Gas Pipeline System

Additional LNG tank

5 5 LOW 5 5 LOW _

5 Soils and

landforms

Spills and leaks Contamination of soil Unplanned dischar ge of drill cuttings or

fluids to the environment from frac-out

from drilling activities onshore

LOW Extended duration of construction activities 6 2 LOW 6 2 LOW This impact did not occur (in the terrestrial

environment) for the Foundation Project

L in e I te m A ff ec te d

Environmental

Factor

Stressor Change introduced by Fourth Train ProposalFoundation

Project

ImpactIncremental Additional

Residual Impact


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Gorgon Gas Development Fourth Train Expansion Proposal │ App F2

Page 2

Revision Date: June 2014 Public© Chevron Australia Pty Ltd

Document #: G4-NT-REPX0000116


C L R C L R


Environmental

Factor


Project


Residual Impact

6 Soils and

landforms

Spills and leaks Contamination of soil Unplanned loss of potentially

contaminated stormwater to the

terrestrial environment because capacity

of stormwater drains is exceeded

LOW Extended duration of construction activities

Footprint increasing by approximately 10 ha

5 3 LOW 5 3 LOW

7 Soils and

landforms

Spills and leaks Contamination of soil Unplanned loss from equi pment (e. g.

hydraulic fluids, oil and grease, diesel),

during construction activities (e.g. during

refuelling and from paint and joint

coating spills for onshore pipeline

construction)


Construction work adjacent to operational

Foundation Project

6 4 LOW 6 4 LOW No change in type or inventory of

hazardous substances anticipated

8 Soils and

landforms

Spills and leaks Contamination of soil Unplanned loss from the storage,

handling and disposal of solid and liquid

wastes

MEDIUM Extended duration of construction activities

Footprint over which impacts could occur

increased by approximately 10 ha

5 4 LOW 5 4 LOW No change in the type of hazardous

substances required/generated for the


Assessment assumes use of the F oundation

Project's Waste Transfer Station on Barrow

Island

9 Soils and

landforms

Spills and leaks Contamination of soil Unplanned loss from the storage,

handling and use of fuels and chemicals

during construction

MEDIUM Extended duration of construction activities 5 3 LOW 4 3 MEDIUM _

10 Soils and

landforms

Spills and leaks Contamination of soil Spill s and leaks dur ing operati ons from:

# Transfer, storage, handling and use ofadditional fuel, chemicals and wastes

# Failure of new plant equipment

#Failure of drainage system

MEDIUM Inventory of hazardous substances will increase

by approximately 33% once operational


Foundation Project

4 3 MEDIUM 4 3 MEDIUM _

Subterranean Fauna

11 Subterranean

fauna


earthworks

Smothering and/or loss of

subterranean fauna and habitat due to

sedimentation of aquifer from high-

sediment run-off or due to loss of

injected concrete to the karst

Excavation of foundations, drains and

underground utilities at the

Gas Treatment Plant site

Excavation of material at the

Additional Support Unit

Earthworks at the Feed Gas

Pipeline System RoW and shore crossings

Runoff of sediment from exposed

surfaces into karst

MEDIUM Approximately 10 ha of clearing and earthworks

additional for the shore crossing




Foundation Project earthworks)

Up to approximately 50 ha of additional

earthworks mainly within the existing approved

Foundation Project Gas Treatment Plant site (areaalready cleared and levelled)



levelled).

Approximately 15 ha of additional re-clearing and

trenching along Feed Gas Pipeline System RoW

Extended duration of construction activities

2 6 LOW 2 5 MEDIUM Subsequent to the Foundation Project risk

assessment, geotechnical work for the

Foundation Project determined that the

likelihood of this impact occurring is

considered rare because the aquifer

beneath the Gas Treatment Plant site is

contiguous and subterranean fauna are not

considered to be limited to one place.

Therefore, risk from Fourth Train Proposal

is lower


5/49






C L R C L R


Environmental

Factor


Project


Residual Impact

12 Subterranean

fauna

Noise and vibration Loss of subterranean fauna and

habitat

Rupture of subsurface karst lenses or

partial collapse of karst formation from

activities such as drilling and blasting

during construction

HIGH Extended duration of construction activities

Amount of blasting for the Fourth Train Proposal

will be considerably less than for the Foundation

Project. Additional drilling may be required if a

3rd LNG tank is installed

6 4 LOW 6 4 LOW Foundation Project risk covered all the

earthworks, blasting and piling required for

the entire Gas Treatment Plant site. The

area that may require activities such as

blasting and drilling for the Fourth Train

Proposal site will be considerably smaller

13 Sub te rran ean

fauna

Physical presence Reduced groundwater recharge under

Fourth Train Proposal infrastructure at

Gas Treatment Plant affecting

subterranean humidity and free water -

and consequently loss of stygofauna

and/or troglofauna

Additional impermeable surfaces and

drainage in Fourth Train Proposal area at

the Gas Treatment Plant during both

construction and operations

MEDIUM Approximately 10 ha of additional handstand for

shore crossing


compacted area/hardstand will be added at the



14 Subterranean

fauna

Spills and leaks Contamination of subterranean

habitats (soil, surface water and/or

groundwater) and associated acute

toxicity to troglofauna and/or

stygofauna

During construction, accidental release of

hydrocarbons, chemicals or construction-

related wastes, refuelling of equipment,

transfer and storage or fuels and waste


Footprint over which impact could occurring

increasing by approximately 10 ha


Foundation Project

5 4 LOW MEDIUM No change in the type of hazardous



15 Subterranean

fauna

Spills and leaks Contamination of subterranean

habitats (soil, surface water and/or

groundwater) and associated acute

toxicity to troglofauna and/or

stygofauna

Once operational, accidental release of

hydrocarbons, chemicals or wastes from:

# Transfer, storage, handling and use of

additional fuel, chemicals and wastes

# Failure of new plant equipment or

pipelines

# Failure of drainage system




16 Subterranean

fauna

Suppression of Dust Loss of troglofauna and stygofauna

due to contamination of groundwater

and/or change in groundwater levels

Use of treated effluent (including treated

sewage), fresh water, recycled water

and/or seawater for dust suppression

MEDIUM Extended duration of construction during which

dust suppression may be required

Area potentially subject to dust suppression


6 5 TRIVIAL _ _ _ Foundation Project risk assessment

assumed use of seawater for dust

suppression. However, in practice, very

little sea water was used for the

Foundation Project; where sea water was

used, its use was restricted to the Gas

Treatment Plant site inwards of a 50 m

buffer zone. Also, many of the roads thatwill be used by Fourth Train Proposal are

now sealed

17 Subterranean

fauna

Unplanned CO2

migration

Acidification of groundwater with

potential loss of stygofauna and/or

asphyxiation of troglofauna from

settlement of CO2 above the water

table

Unplanned CO2 migration or release to

the surface or near surface environment

during operations from deep faults

within the Dupuy formation

LOW Approximately 2% increase in the rate of injection

of reservoir CO2 into the Dupuy Formation to the

approved Foundation Project

5 6 TRIVIAL _ _ _ Detailed in the PER/Draft EIS due to

regulator interest


6/49


Page 4




C L R C L R


Environmental

Factor


Project


Residual Impact

Surface and ground water

18 Surface and

groundwater


earthworks

Sedimentation of natural drainage

systems

Vegetation clearing and earthworks

associated with construction of

Terrestrial Facilities (shore crossings,

Feed Gas Pipeline System, Additional

Support Area earthworks, and additional

infrastructure at Gas Treatment Plant

sites)

MEDIUM Approximately 10 ha of clearing and earthworks

additional for the shore crossing






earthworks mainly within the existing approved

Foundation Project Gas Treatment Plant site (area

already cleared and levelled)



levelled).

Approximately 15 ha of additional re-clearing and

trenching along Feed Gas Pipeline System RoW.


6 3 LOW 6 3 LOW _

19 Surface and

groundwater

Fire Change in surface water and

groundwater quality resulting from

runoff containing nutrients and

chemicals

Runoff from water or foam used for fire

control

_ Extended duration of construction activities that

have potential to ignite fire


Extension of physical footprint by approximately

10 ha

5 6 TRIVIAL _ _ _ Likelihood of this impact occurring

considered 'rare' based on experience from

Foundation Project and mitigation

measures in place

20 Surface and

groundwater

Physical presence Disturbance/alteration of natural

drainage patterns (resulting in change

in groundwater infiltration, increased

runoff, and recharge rates)

Additional impermeable surfaces and

drainage in the Fourth Train Proposal

area of Gas Treatment Plant (both

construction and operations phase)

MEDIUM approximately 10 ha of additional handstand for

shore crossing


compacted area/hardstand will be added at the



21 Surface and

groundwater

Spi ll s an d le aks Con tamination o f grou nd wate r P re co mm ission in g le aks an d sp il ls ,

including loss of saline water during

hydrotesting of Feed Gas Pipeline Systempipestring or LNG tank, hydraulic fluids.

LOW Additional Feed Gas Pipeline System

Additional LNG tank

5 4 LOW 5 4 LOW _

22 Surface and

groundwater

Spi ll s and le aks Con tamination of grou nd wate r Unp lann ed lo ss of po te nt ia lly

contaminated stormwater to the

terrestrial environment because capacity

of stormwater drains is exceeded


Footprint increasing by approximately 10 ha

5 3 LOW 5 3 LOW _


7/49






C L R C L R


Environmental

Factor


Project


Residual Impact

23 Surface and

groundwater

Spills and leaks Contamination of groundwater During construction, accidental release of





Footprint over which impacts could occur



Foundation Project

6 3 LOW 4 3 MEDIUM No change in the type of hazardous



Assessment assumes use of the F oundation

Project's Waste Transfer Station on Barrow

Island

24 Soils and

landforms

Spills and leaks Surface water and groundwater

contamination

Unplanned loss from the storage,

handling and use of fuels and chemicals

during construction



Foundation Project

5 3 LOW MEDIUM _

25 Surface and

groundwater

Spills and leaks Surface water and groundwater

contamination

Spills and leaks during operations from:



# Failure of new plant equipment





26 Surface and

groundwater

Suppression of Dust Increase in groundwater levels and

mounding

Use of treated effluent (including treated

sewage), fresh water, recycled water

and/or seawater for dust suppression

MEDIUM Extended duration of construction during which

dust suppression may be required

Area potentially subject to dust suppression


This stressor was considered for the Foundation

Project because of the intention to use sea water

for dust suppression. However, in practice, very

little sea water was used for the Foundation

Project; where sea water was used, its use was

restricted to the Gas Treatment Plant site inwards

of a 50 m buffer zone

6 5 TRIVIAL _ _ _ Foundation Project risk assessment

assumed use of seawater for dust

suppression. However, in practice, very

little sea water was used for the

Foundation Project; where sea water was

used, its use was restricted to the Gas

Treatment Plant site inwards of a 50 m

buffer zone. Also, many of the roads that

will be used by Fourth Train Proposal are

now sealed.

Terrestrial fauna

27 Terrestrial fauna Artif icial l ight Behavioural changes to terrestrial

fauna (not turtles) including disruption

of foraging, breeding and other

nocturnal fauna activity

Change in community structure in area

affected by light spill because seabirds

(e.g. silver gull)/other predators are

attracted by insects etc around lighting

Artificial lighting used at terrestrial

construction sites

LOW Extended duration of construction activities (and

period of light generation at shore crossing and

along Feed Gas Pipeline System onshore route)

Additional light at the Gas Treatment Plant site

6 2 LOW 6 2 LOW _


8/49


Page 6




C L R C L R


Environmental

Factor


Project


Residual Impact

28 Terrestrial fauna Artif icial l ight Behavioural changes to terrestrial

fauna (not turtles) including disruption

of foraging, breeding and other

nocturnal fauna activity

Change in community structure in area

affected by light spill because seabirds

(e.g. silver gull)/other predators are

attracted by insects etc around lighting

Artificial lighting used at the Gas

Treatment Plant site during operations

LOW Additional long-term light sources at the Gas

Treatment Plant site

5 3 LOW 5 3 LOW _

29 Terrestrial fauna Atmospheric emissions

(except dust)

Sub lethal or toxic effects on fauna

from inhalation of pollutants and

ingestion of pollutants on vegetation

or in water

Operational emissions including:

# Low levels of vehicle and equipment

exhaust emissions (NOx, SOx)

# Additional combustion and fugitive

emissions of SOx, NOx, CO2, CO, CH4, H2S,

BTEX and particulates from Fourth Train

Proposal infrastructure

# Gas leak through pipeline or equipment

failure

# Additional flaring (e.g. during

commissioning, start-up and process

upsets)

# Unscheduled start-up and shut-down

of gas processing facility

# Equipment failure resulting in

emissions of H2S and BTEX


Emissions during the construction activities of the

Fourth Train Proposal will be comparatively

smaller than for Foundation Project

Additional operational emissions (increased by a

factor of approximately 33%)

5 4 LOW 5 4 LOW _

30 Terrestrial fauna Vegetation clearing and

earthworks

Death or displacement of fauna from

removal of habitat

(Excludes interaction with machinery -

see under "Physical Interaction")

Removal of vegetation and topsoil LOW Approximately 10 ha of additional land clearing

and earthworks at shore crossing



directional drilling site

Delay to reinstatement at the Additional Support

Area (area already cleared and levelled)

Approximately 15 ha of additional re-clearing

along Feed Gas Pipeline System RoW

6 4 LOW 6 4 LOW There are no Boodie warrens to be

removed. Termite mounds present within

the Fourth Train Proposal shore crossing

site


9/49






C L R C L R


Environmental

Factor


Project


Residual Impact

31 Terrestrial fauna Vegetation clearing and

earthworks

Displacement and loss of individual

short-range endemics

Removal of vegetation and topsoil HIGH Extended duration of construction activities

No additional clearing at the Gas Treatment Plant

site

Approximately 10 ha of additional land clearing at

shore crossing

Up to 10 ha of additional re-clearing at the

Foundation horizontal directional drilling site

Delay to reinstatement at the 32 ha Additional

Support Area (area already cleared and levelled)


along Feed Gas Pipeline System RoW)

Clearing within 332 ha for Foundation Project and


5 5 LOW 5 5 LOW High impact for Foundation Project

attributed to clearing and earthworks for

the Gas Treatment Plant. No additional

clearing required at Gas Treatment Plant

site for the Fourth Train Proposal

32 Terrestrial fauna Creation of heat and/or

cold

Injury or death to avifauna (flying

through heat plume) or to reptiles(attracted to the heat)

Attraction of fauna to cryogenic/cold

equipment at the Gas Treatment Plant

Additional use of ground flares during

Fourth Train Proposal commissioning,start-up in the event of upset conditions

LOW Increased use of Foundation Project's ground

flare by approximately 30% compared toFoundation Project

6 5 TRIVIAL _ _ _ Commissioning will be short term

(approximately 6 months); start ups will beoccasional and short-term (few days)

Ground Flare s45c ranked heat as a low ri sk

33 Terrestrial fauna Fire Fauna injury and/or death;

loss/change in habitat and associated

change in fauna community

composition

Industrial fire that spreads to adjacent

vegetation

MEDIUM Potential increased consequence of fire during

construction at Gas Treatment Plant site while

Foundation Project is operational

Extended duration of construction activities that

have the potential to ignite fire


5 4 LOW 5 4 LOW

34 Terrestrial fauna Fire Injury or mortality to fauna; loss orchange in habitat and associated

change in fauna community

composition

Accidental wildfire spreading into thesurrounding vegetation due to hot works

activities (e.g. welding, grinding) or

machinery

MEDIUM Extended duration of construction activities thathave the potential to ignite fire

5 2 MEDIUM 5 2 MEDIUM Fire events have been successfullymanaged

35 Terrestrial fauna Introduction and/or

spread of Non-

indigenous Terrestrial

Species

Death or out-competition of native

fauna resulting in change in

community structure and/or species

abundance

Carriage of Non-indigenous Terrestrial

Species on the topsides of vessels using

the Materials Offloading Facility/WAPET

Landing or contained within cargo

LOW Increased number of vessels and cargo 4 4 LOW 4 4 LOW Best practice quarantine management;

there have been no successful

introductions to-date

36 Terrestrial fauna Introduction and/or

spread of Non-


Species


fauna resulting in change in

community structure and/or species

abundance

Carriage of Non-indigenous Terrestrial

Species on the topsides of LNG and

condensate vessels

MEDIUM Increased number of vessels 4 3 MEDIUM 4 3 MEDIUM _


10/49


Page 8




C L R C L R


Environmental

Factor


Project


Residual Impact

37 Terrestrial fauna Noise and vibration Disturbance to or displacement of

terrestrial fauna and potential

behavioural changes affecting local

population abundance and distribution

(e.g. impacts on White-winged Fairy

wren)

Construction of terrestrial facilities

including: Earthworks, vehicle

movements and operation of machinery

and equipment,

Cutting and grinding and Pipeline

trenching

MEDIUM Extended duration of construction activities which

will be occurring at the same time as Foundation

Project operation

6 2 LOW 6 1 MEDIUM The Terrestrial and Subterranean

Environment Protection Plan (2010) lists

this as medium risk. However, the

assessment included impacts associated

with seismic survey. The Public

Environment Review (2008) risk

assessment did not include blasting and

seismic survey noise and was used for the

Foundation Project risk assessment

38 Terrestrial fauna Noise and vibration Disturbance to or displacement of

terrestrial fauna and potential

behavioural changes affecting local

population abundance and distribution

(e.g. impacts on White-winged Fairy

wren)

Additional noise from operational Gas

Treatment Plant

MEDIUM Additional noise sources added 6 1 MEDIUM 5 1 MEDIUM _

39 Terrestrial fauna Physical interaction Fauna injury and/or death Use of equipment and machinery and

additional vehicle movements during

construction of terrestrial infrastructure

Clearing of vegetation

MEDIUM Extended duration of construction phase

Additional vehicle movements during

construction

Increased area over which clearing takes place

(approximately 10 ha)


40 Terrestrial fauna Physical interaction Entrapment and drowning of fauna Open trench prior to installation of the

Feed Gas Pipeline System (includingduring a rain event)

LOW Extended duration of construction activities 6 5 LOW 6 5 LOW

41 Terrestrial fauna Physical interaction Fauna injury and/or death Additional operational vehicle

movements

MEDIUM Small increase in number of operational vehicle

movements


42 Terrestrial fauna Physical interaction Entrapment and subsequent death or

injury of mobile fauna resulting in an

associated change in fauna community

composition

Excavation of foundations, drains,

underground utilities, Feed Gas Pipeline

footprint etc


Extent of excavated area for the Fourth Train

Proposal less than the F oundation Project

6 4 LOW 6 4 LOW Gas Treatment Plant site is fenced,

reducing the risk of entrapment.

43 Terre st rial faun a Spi ll s an d leaks P oiso ning , inj ury or drow ning of

mobile fauna attracted to a pool

collected in a claypan

Spill or leak of hydrotest water,

containing biocides and corrosion

inhibitors, to the onshore environment

_ Extended duration of construction activities 5 5 LOW 5 5 LOW

44 Terrestrial fauna Spills and leaks Creation of small 'mud pools' in which

fauna could become trapped

Unplanned discharge of drill cuttings or

fluids to the environment during

construction - Frac-out from drilling

activities onshore

LOW _ 6 2 LOW 6 2 LOW _

45 Terrestrial fauna Spills and leaks Smothering, acute or chronic toxicity

to habitat and/or individual fauna






Extension of physical footprint within which this

impact could occur by approximately 10 ha


Foundation Project

5 5 LOW 5 5 LOW _


11/49






C L R C L R


Environmental

Factor


Project


Residual Impact

46 Terrestrial fauna Spills and leaks Smothering, acute or chronic toxicity

to habitat and/or individual fauna

from contamination of habitat (soil or

water) or from ingestion, asphyxiation

etc






pipelines


LOW Inventory of hazardous substances will increase


4 4 LOW 4 4 LOW _

47 Terrestrial fauna Unplanned CO2

migration

Asphyxiation of fauna in low-lying

areas (e.g. fauna burrows)



from deep faults within the Dupuy

formation




5 6 TRIVIAL _ _ _

Terrestrial flora and vegetation associations

48 Terrestrial flora

and vegetation

communities

Atmospheric emissions

(except dust)

Physiological effects on flora and

vegetation communities from the

deposition of pollutants resulting in:

# Change in taxon dominance due to

nitrogen enrichment and soil acidity

# Alteration of community

composition

# Increased growth due to uptake of

nitrogen or CO2

Construction-phase vehicle and

equipment exhaust emissions (NOx, SOx,

particulates etc)

LOW Extension of duration of construction period

Additional emissions (although volumes likely to

be less than that generated during Foundation

Project construction due to smaller scope of

Fourth Train Proposal)

5 4 LOW 5 4 LOW _


and vegetation

communities

Atmospheric emissions

(except dust)

Physiological effects on flora and

vegetation communities from the

deposition of pollutants resulting in:

# Change in taxon dominance due to

nitrogen enrichment and soil acidity

# Alteration of community

composition

# Increased growth due to uptake of

nitrogen or CO2

Additional combustion and fugitive

emissions of SOx, NOx, CO2, CO, CH4, H2S,

VOCs and particulates from the Fourth

Train Proposal infrastructure

Gas leak through additional pipeline or

equipment failure

Additional flaring and venting during

commissioning and start-up

LOW Additional emissions 5 4 LOW 5 4 LOW _


and vegetation

communities


earthworks

Loss of flora and vegetation

communities including restricted

species and communities

Habitat disturbance or loss, including

impacts from erosion

Clearance of up to 10 ha of fl ora and

vegetation for the terrestrial component

of the shore crossing site and Feed Gas

Pipeline System footprint. Approximately

25 ha of re-clearing at Foundation

Project horizontal directional drilling site

and Feed Gas Pipeline RoW, to 332 ha for

Foundation Project and Fourth Train

Proposal

Stripping, stockpiling, laying guidewires

HIGH Approximately 10 ha of additional land clearing at

shore crossing

Up to 10 ha of additional re-clearing at the

Foundation horizontal directional drilling site

Delay to reinstatement at the 32 ha Additional

Support Area


along Feed Gas Pipeline System RoW

5 4 MEDIUM 5 4 MEDIUM High ranking from the Foundation Project is

based on clearance of restricted flora and

vegetation from the Gas Treatment Plant

site. Additional impact risk ranking is based

on restricted vegetation associations

impacted by both the Fourth Train Proposal

and the Foundation Project


12/49


Page 10




C L R C L R


Environmental

Factor


Project


Residual Impact


and vegetation

communities


earthworks

Loss of vegetation including restricted

vegetation community or species

Vegetation clearing for Feed Gas Pipeline

System footprint

LOW No change - clearance of Feed Gas Pipeline

System footprint was already assessed for the


6 4 LOW 6 4 LOW _


and vegetation

communities


earthworks

Loss or damage to flora/vegetation

through pooling of water following

rain

Excavation, creation of channels and

barriers and change in local hydrological

flow patterns

_ Extended duration of construction activities



6 2 LOW 6 2 LOW _

53 Terre st rial f lora

and vegetation

communities


earthworks

Wind erosion of topsoil with

consequent loss of seedbank

Clearance of up to ~ 10 ha of flora and


of the shore crossing site. Approximately

25 ha of re-clearing at Foundation

Project horizontal directional drilling site



Proposal.

Stripping and stockpiling of topsoil

_ Approximately 10 ha of additional vegetation

clearance required (at shore crossing site),

approximately 25 ha of re-clearing at Foundation

Project horizontal directional drilling site and

Feed Gas Pipeline RoW, to 332 ha for Foundation

Project and Fourth Train Proposal


5 3 LOW 5 3 LOW _


and vegetation

communities


earthworks

Washout of sediments with

consequent smothering and loss of

vegetation, loss of seed bank and

change in drainage

Potential to impact priority ecological

communities

Clearance of up to 10 ha of fl ora and


of the shore crossing site. Approximately

25 ha of re-clearing at FoundationProject horizontal directional drilling site



Proposal.

Stripping and stockpiling of topsoil




6 2 LOW 6 2 LOW _


and vegetation

communities

Creation of dust Reduction in plant growth from

deposition of dust on flora and

vegetation

Vegetation clearing, earthworks, vehicle

and machinery movements, concrete

batching, stockpiling, pipeline trenching

LOW Extension of footprint by approximately 10 ha


6 5 TRIVIAL _ _ _


and vegetation

communities

Creation of dust Reduction in plant growth from

deposition of dust on flora and

vegetation

Additional vehicle movements along

unsealed roads


Small additional number of vehicle movements

during operation

6 5 TRIVIAL _ _ _ Many of the roads that will be used have

been sealed and dust suppression is

undertaken


and vegetation

communities

Creation of heat and/or

cold

Burning of vegetation around ground

flare area

Additional use of ground flares during

Fourth Train Proposal commissioning,

start-up in the event of upset conditions

LOW Additional use of ground flares during

commissioning, start-up and in the event of an

upset

5 6 TRIVIAL _ _ _ Operation of the ground flare may

potentially impact the vegetation from time

to time, with potential for superheated air

being pressed on to the surrounding

environment during high wind speeds

under emergency flaring conditions,

however the probability of this occurring is

low at approximately one to two times in

lifetime of the Project


13/49






C L R C L R


Environmental

Factor


Project


Residual Impact


and vegetation

communities

Fire Loss of native flora and alteration to

vegetation community composition

and/or reduction in topsoil quality and

associated loss of seed bank

Accidental wildfire spreading into the

surrounding vegetation due to hot works

activities (e.g. welding, grinding) or

machinery

MEDIUM Extended duration of construction activities that

have the potential to ignite fire

5 1 MEDIUM 5 1 MEDIUM Fire events have been successfully

managed


and vegetation

communities

Introduction and/or

spread of Non-

indigenous TerrestrialSpecies

Spread of weeds on Barrow Island

causing out-competition of native

vegetation, a change in vegetationcommunity structure or loss of

restricted flora communities

Movement of vehicles, personnel and

equipment to, from and around

worksites; movement of topsoil tostorage sites


during which increased movement of vehicles,

personnel and equipment occurs

4 4 LOW 4 4 LOW _

60 Terre st rial f lora

and vegetation

communities

Introduction and/or

spread of Non-


Species


flora resulting in change in community

structure and/or species abundance

Import of rocks and/or stabilisation

material from the mainland to be used

for pipeline stabilisation as it approaches

Barrow Island. Rocks and stabilisation

material could harbour seeds and spores

of Non-indigenous Terrestrial Species

which could be blown onto, or float over

to Barrow Island


during which rocks and/or stabilisation materials

are imported

3 5 LOW 3 5 LOW _


and vegetation

communities

Introduction and/or

spread of Non-


Species




Carriage of seeds or spores of Non-

indigenous Terrestrial Species on the

topsides of vessels using the Materials

Offloading Facility/WAPET Landing or

contained within cargo


during which increased movement of vessels,


4 4 LOW 4 4 LOW Best practice quarantine management;

there have been no successful

introductions to-date


and vegetation

communities

Introduction and/or

spread of Non-


Species




Carriage of seeds or spores of Non-

indigenous Terrestrial Species on the

topsides of additional visiting LNG and

condensate tankers


during which increased movement of vessels,




and vegetation

communities

Physical interaction Loss of vegetation communities or

conservation significant flora outside

the Fourth Train Proposal Footprint

Vehicles driving off tenure LOW Additional vehicle and personnel movements

during construction and operation

6 5 TRIVIAL _ _ _ Off tenure areas will have access strictly

limited. Therefore, likelihood of flora and

vegetation communities being significantly

damaged from vehicles driving off tenure is

remote


and vegetation

communities

Spi ll s an d leaks Dis tu rb an ce to coastal d un e

vegetation either from erosion or

smothering of vegetation

Unplanned discharge of drill cuttings or

fluids to the environment during

construction - Frac-out from drilling

activities onshore

LOW Extended duration of construction phase 6 4 LOW 6 4 LOW _


and vegetationcommunities

Spills and leaks Spill to claypan environment causing

impact to flora and vegetationcommunities

Spill or leak of hydrotest water,

containing biocides and corrosioninhibitors, to the onshore environment

_ _ 5 5 LOW 5 5 LOW


and vegetation

communities

Spills and leaks Loss of vegetation and or reduced

plant growth (Secondary impact from

contamination of soils, surface water

and/or groundwater)





LOW Extended duration of construction phase

Extension of physical footprint within which this

impact could occur by approximately 10 ha


Foundation Project

6 4 LOW 6 4 LOW Assumed that there will be an operational

waste transfer station (with adequate

drainage) on Barrow Island in time for

Fourth Train Proposal construction start

│


14/49


Page 12




C L R C L R


Environmental

Factor


Project


Residual Impact


and vegetation

communities

Spills and leaks Loss of vegetation and or reduced

plant growth (secondary impact from

contamination of soils, surface water

and/or groundwater)






pipelines


LOW Inventory of hazardous substances will increase


5 3 LOW 5 3 LOW _


and vegetation

communities

Unplanned CO2

migration

Change in vegetation community

composition



from deep faults within the Dupuy

formation




5 6 TRIVIAL _ _ _


15/49





Consolidated Risk Assessment Results: Impacts to the Coastal and Nearshore Environment

Comments

C L R C L R

Foreshore

1 F ores hore V eget at ion C lear ing

and earthworks

Change in natural drainage pattern

reducing sediment supply; loss of

coastal dune vegetation

Site levelling or excavation activities at

the horizontal directional drilling site

_ FTP will result in further vegetation clearing and

earthworks (but this is inland of the foreshore

area)

6 5 TRIVIAL _ _ _ Activities are not anticipated to alter

drainage patterns which could result in

impacts to stability or integrity of the

foreshore. Clearing of vegetation is inland

of the foreshore area

2F ores hore P hy si ca l presenc e Dis turbance to ex is ti ng vegeta ti onand localised erosion of the dune Laying of temporary water winninginfrastructure across dune zone and

intertidal area; placement of clump

weights to secure pipeline

LOWFTP will result in additional presence ofinfrastructure, but this will be temporary. The

infrastructure will be removed at the end of

construction activities

6 6 TRIVIAL _ _ _No change to dune vegetation isanticipated. Weight clumps will be placed to

avoid any scattered dune vegetation

encountered

3 F or es ho re S pi ll s a nd le ak s Co nt ami na ti on of se di me nt s a bo ve

the high water mark affecting

sediment quality (physical and

chemical)

Rupture or leak of condensate from live

Feed Gas Pipeline System e.g. from

anchoring during shore crossing activities,

or once the Feed Gas Pipeline System for

the Fourth Train Proposal is operational

_ Additional leak or rupture source with the Feed

Gas Pipeline System for the Fourth train Proposal

in place

3 5 LOW 3 5 LOW Rupture at close proximity has the potential

to affect the foreshore if the spill or leak

occurs under severe weather conditions or

during spring tidal events. The nature of

condensate indicates that it will be rapidly

volatilised leaving little in the way of residue

on the surface of the sediment




chemical)

Marine vessel collision or grounding

during mobilisation of equipment,

materials and supplies to Barrow Island

during construction and operation (oil

type: diesel or heavy fuel oil Marine

vessel refuelling incident)

LOW Increased likelihood of a spill or leak occurring

with additional construction activities, however,

consequence is not expected to be greater for the

Fourth Train Proposal than for the Foundation

Project

3 5 LOW 3 5 LOW Risk assessment assumes vessel grounding

is close to Barrow Island. It is unlikely to

affect foreshore (given its position above

high water) unless under severe weather

conditions and spring tides where spray may

reach this area




chemical)

Condensate or LNG vessel grounding at

the LNG Jetty (oil type: bunker fuel oil)

_ Additional source of a spill or leak with additional

condensate and LNG vessel activity around Barrow

Island

3 5 LOW 3 5 LOW It is unlikely to affect foreshore (given its

position above high water) unless under

severe weather conditions and spring tides

where spray may reach this area. However,

medium ranking assigned due to the

severity of the potential environmental

consequence of sediment contamination if a

bunker fuel oil spill did occur




chemical)


the LNG Jetty (oil type: crude oil or

condensate)

_ Additional LNG and condensate vessels

frequenting the LNG Jetty on the east coast of

Barrow Island

5 5 LOW 5 5 LOW _

7 F or es ho re S pi ll s a nd le ak s I mp ac t o n th e i nt eg ri ty an d st ab il ity

of sediment above the high water

mark (physical changes due to

collapse of the drill hole and releaseof drill cuttings and fluids)

Frac-out (unplanned discharge) of drill

cuttings or fluids from drilling activities

_ Additional source of a spill or leak affecting a new

geographical area

5 6 TRIVIAL _ _ _ Frac-out unlikely in the foreshore area due

to the distance between the horizontal

directional drilling and the surface of the

foreshore (approximately 10 m)

Line Item Residual Impact


Change Introduced by the Fourth Train ProposalAffected

Environmental

Factor

Stressor Potential Impact Activity Foundation

Project

Impact


16/49


Page 2




Comments

C L R C L R




Environmental

Factor


Project

Impact

Marine benthic primary producer habitats

8 Marine benthic

primary producer

habitats

Discharges to sea Acute or chronic exposure to

contaminants resulting in reduction in

health status or death of BPPH

Marine vessel related discharges

including discharge of treated sewage,

greywater; brine; cooling water;

putrescibles and deck drainage

MEDIUM Additional frequency of discharge and additional

loads of nutrients and chemicals to the marine

environment. Additional areas potentially exposed

to discharges

6 3 LOW 6 3 LOW Dispersive nature of receiving environment

and temporary and localised discharges are

unlikely to affect BPPH above localised

changes. MARPOL regulations prohibit

putrescibles within State Water and sewage

must be treated. There is limited BPPH in

the shore crossing area as marine vessels

will be beyond the pavement; dispersive

nature of the marine environment will

reduce concentration exposure

9 Marine benthic

primary producer

habitats

Discharges to sea Smothering of benthic primary

producer habitats off the west coast

of Barrow Island

Planned loss of drilling fluids and cuttings

into the coastal and nearshore

environment from the horizontal

directional drilling exit

MEDIUM Additional drill cuttings and fluids released off the

west coast of Barrow Island affecting a new

geographical area of BPPH

6 4 LOW 6 4 LOW There is limited benthic primary producer

habitats in the shore crossing area to be

impacted upon and therefore risk ranking

for Fourth Train Proposal is reduced

1 0 M ar ine benth ic

primary producer

habitats

Introduction and/or

spread of Marine Pests

Loss of native benthic primary

producer habitats, and/or a change in

community structure due to

competition from Marine Pests or

parasites

Movement of vessels carrying Marine

Pests on their wet-sides

Discharge of ballast and bilge water from

LNG and condensate vessels

MEDIUM Increased number of vessels 4 3 MEDIUM 4 3 MEDIUM During the operations phase - no

operational control of vessels outside Port

Limits which increases the risk from LNG

and condensate vessels

11 Marine benthic

primary producerhabitats

Introduction and/or

spread of Marine Pests

Loss of native benthic primary

producer habitats, and/or a change incommunity structure due to

competition from Marine Pests or

parasites

Movement of vessels carrying Non-

indigenous Terrestrial Species and/orMarine Pests on their wet-sides

Discharge of ballast and bilge water from

logistics vessels

Mobilisation of vessels and equipment,

vessel discharges including ballast and

bilge water and possible installation of

guidewires for the shore crossing site

LOW Increased number of vessels 3 5 LOW 3 5 LOW Best practice quarantine management;

there have been no successful introductionsto-date

12 Marine benthic

primary producer

habitats

Physical presence Permanent loss and replacement of

benthic primary producer habitat

where pipeline and stabilisation

material is laid

Introduction of contaminants from

infrastructure

Installation of, and permanent presence

of, the Feed Gas Pipeline System

Presence of barge accommodation and

barge laydown

LOW Additional infrastructure present on the west

coast of Barrow Island. Additional infrastructure

present on the east coast

5 5 LOW 5 5 LOW Risk assessment assumes the impact is

limited to where the pipeline system is laid.

Stabilisation material is inert and not

considered a contamination source. BPPH

unlikely to be present on the east coast

given the area longside the MOF

and/WAPET landing will have been

disturbed by Foundation Project

construction activities13 Marine benthic

primary producer

habitats

Seabed disturbance Loss or degradation of benthic

primary producer habitat in the

contact area

Grooming of the seabed in preparation

for the sinking of barge accommodation

and barge laydown for Fourth Train

Proposal construction

Anchoring of floatel accommodation

(option) during construction

_ Additional seabed area affected (however,

magnitude and extent of area impacted will be

less)

5 6 TRIVIAL _ _ _ Area is within an area likely to be disturbed

by Foundation Project construction

activities, so unlikely to be in a natural state

or to contain substantial BPPH


17/49






Comments

C L R C L R




Environmental

Factor


Project

Impact

14 Marine benthic

primary producer

habitats


primary producer habitat during

preparation for Feed Gas Pipeline

System

Smothering of benthic primary

producer habitats from sediment

settlements

Feed Gas Pipeline System preparation

activities; pipe-lay activates and

stabilisation activities

LOW TO

MEDIUM

Additional geographical area affected with the

preparation and pipe-lay activities

5 4 LOW 5 4 LOW Horizontal directional drilling exit point is

beyond the main limestone pavement

which supports BPPH. This choice of

technique has avoided the main area where

BPPH is found. BPPH found beyond the

pavement is limited and not considered

extensive

15 Marine benthic

primary producer

habitats

Physical presence Loss or degradation of benthic

primary producer habitat over which

the pipeline system is laid

Laying and long-term presence of the

Feed Gas Pipeline System onto the

seabed

LOW Additional area of seabed affected (however,

magnitude and extent of area impacted will be

less)

5 3 LOW 5 3 LOW _

16 Marine benthic

primary producer

habitats


primary producer habitat in the

contact area

Anchoring of vessels, laying and stabilising

pipe (up to approximately 400m beyond

the shore crossing breakout points)

directly on the seabed, accidental vessel

grounding, use of dynamic positioning on

vessels (thrusters), dropped objects,

laying the initial water winning line and

guidewires, span correction

LOW Additional area impacted by anchoring off the

west coast of Barrow Island

5 4 LOW 5 4 LOW Horizontal directional drilling exit point is

beyond the main limestone pavement

which supports BPPH. This choice of

technique has avoided the main area where

BPPH is found. BPPH found beyond the

pavement is limited and not considered

extensive. Marine vessels will

predominantly be operating beyond the

pavement area, impact on BPPH will be

cursorary. BPPH that do exist off North

Whites Beach are naturally exposed to a

high-energy turbid environment

17 Marine benthic

primary producer

habitats

S pi ll s a nd leak s Acute or c hronic ex posure t o



Unplanned spill of hydrocarbons or

chemicals to the marine environment

from the failure of storage, refuelling or

handling equipment

LOW Increased likelihood of a spill or leak occurring,

however, consequence is not expected to be

greater for the Fourth Train Proposal than for the

Foundation Project

6 3 LOW 6 3 LOW _

18 Marine benthic

primary producer

habitats




Rupture or leak of condensate from live

Feed Gas Pipeline System e.g. from

anchoring during shore crossing activities,

or once the Feed Gas Pipeline System for

the Fourth Train Proposal is operational

LOW TO

MEDIUM

Additional source of a spill or leak from a rupture

occurring when crossing over a live Foundation

Project pipeline during construction or operation

of the Fourth Train Proposal potentially affecting a

new geographical area

3 5 LOW 3 5 LOW Risk assessment based on worst case (spill

or leak being lost close to shore -

approximately 200 m west of Barrow Island)

Risk assessment assumes volume of

condensate lost is limited to the volume of

the pipeline. Probability of the event

occurring is considered very low.

Condensate will rapidly volatise, reducing

exposure risk. subtidal BPPH will to some

degree be buffered by the water column

19 Marine benthic

primary producer

habitats



health status or death

Smothering of benthic primary

producer habitats (e.g. scleractinian

corals and other benthic primary

producer habitats reliant on light)

Leak from Materials Offloading Facility

during transportation (no storage)

_ Increased likelihood of a spill or leak occurring,



Foundation Project

4 4 LOW 4 4 LOW Risk assessment based on the long term

impacts on coastal habitats

Risk assessment assumed the worst case of

a spill during the marine turtle peak

hatchling time


18/49


Page 4




Comments

C L R C L R




Environmental

Factor


Project

Impact

2 0 M ar ine benth ic

primary producer

habitats

Spi lls and leaks Metabolic impacts on inter-t idal and

shallow and subtidal BPPH - physical

smothering of BPPH resulting in a

reduction in species abundance

and/or taxon dominance

Marine vessel collision or grounding

during mobilisation of equipment,

materials and supplies to Barrow Island

during construction. Condensate or LNG

vessel grounding at the LNG Jetty;

condensate; re-fuelling incident (oil types:

diesel; crude oil or condensate)

LOW Increased likelihood of a spill or leak occurring,



Foundation Project

5 3 LOW 5 3 LOW Risk assessment based on release of bunker

fuel oil as this generates the more severe

consequences

Limited inter-tidal corals / poorly developed

BPPH communities on the east coast of

Barrow Island. Any impact is expected to be

short-term and at local to widespread scale

21 Marine benthic

primary producer

habitats

Spi lls and leaks Metabolic impacts on intertidal and

shallow tidal benthic primary

producer habitats resulting in a


and/or taxon dominance resulting


the LNG Jetty (oil type: bunker fuel oil)

MEDIUM Increased likelihood of a spill or leak occurring,



Foundation Project

3 4 MEDIUM 3 4 MEDIUM

22 Marine benthic

primary producer

habitats

Spi lls and leaks Physical impacts (smothering or

abrasion) to benthic primary

producer habitats; metabolic impacts

due to energy reductions from

reduced light penetration

Planned release of drill cuttings or fluids

to the coastal and nearshore

environment as a result of frac-out

LOW Additional source of a spill or leak affecting a new

geographical area

6 2 LOW 6 2 LOW _

23 Marine benthic

primary producer

habitats

Spi lls and leaks Metabolic impacts on inter-t idal and

shallow and subtidal BPPH - physical

smothering of BPPH resulting in a


and/or taxon dominance


the LNG Jetty (oil type: crude oil or

condensate).

_ Additional source of a spill or leak potentially

affecting a new geographical area

5 5 LOW 5 5 LOW Condensate - highly volatile, so will

evaporate rapidly into the atmosphere

Marine fauna

24 M ar ine f auna Art if ic ia l l ight A lt er fora gi ng and breeding a ct iv it y i n

seabirds, fish and dolphins

Disorientation of marine fauna such

as birds

Increased incidents of marine fauna

interactions with vessels and

equipment

Creation of greater concentration of

adaptable species leading to

increased mortality of food source

Artificial light emissions from construction

activities; logistic and support vessels

associated with shore crossing site and

pipe-lay preparation and laying activities

by marine vessels

LOW Additional construction activities on the west of

Barrow Island at the horizontal dire ctional drilling

site requiring artificial light sources and

navigational/security/work lighting on marine

vessels involved in preparation and laying of the

Feed Gas Pipeline System. New geographical area

potentially affected

6 4 LOW 6 4 LOW No long-term stationary sources of artificial

light. Lighting sources on the we st coast will

be temporary and for the duration of

construction only. Management actions

from the Long-term Marine Turtle

Management Plan will be applied during

construction

A F2 │ A di


19/49






Comments

C L R C L R




Environmental

Factor


Project

Impact

25 M ar ine f auna Art if ic ia l l ight Att ra ct ion of m ar ine f auna such as

seabirds, shorebirds, pelagic fish and

sharks, resulting in:

# increased incidents of interactions

with vessels and equipment

# greater concentration of adaptable

species leading to increased mortality

of food source

# disorientation of certain marine bird

species (e.g. localised populations of

wedge-tailed shearwater)

Artificial lighting during construction

activities at the shore crossing site

(horizontal directional drilling site) and

pipe-lay preparation and laying activities

by marine vessels.








6 2 LOW 6 2 LOW Activity should only be conducted over a

short term period during construction.

West coast is not considered to provide

important habitat to non-breeding

migratory birds, impacts are considered

unlikely. Any foraging is likely to be during

the day by individuals and as such impact

from light is not foreseen

26 M ar ine f auna Art if ic ia l l ight B ehav ioural changes of m ar ine t ur tl es

or hatchlings (disorientation;

repulsion; attraction) leading to

potential mortality from increased

predation or reduced health.

Attraction resulting in increased

incidents of interactions with vessels

and equipment and disruption to

marine turtle nesting and hatchling

survival

Artificial lighting during construction

activities on west coast (horizontal

directional drilling; pipelay) and east coast

(gas treatment plant); and the operations

phase (product loading associated lighting

for condensate and LNG vessels).

LOW TO

MEDIUM

Additional construction activities on the west of






potentially affected. additional marine vessels);

additional construction lighting on east coast (Gas

Treatment Plant); Additional LNG and condensate

loading operations on LNG Jetty and on vessels.

Artificial task lighting used for safe operation ofthe Materials Offloading Facility/WAPET Landing

during construction and operation of the Fourth

Train Proposal.

4 3 MEDIUM 4 2 MEDIUM Risk ranking depends on seasonality (ranked

on worst case season scenario) - Where

practicable, work schedule for shore

crossing activities to avoid peak turtle

nesting season to reduce risk to Low.

Scenario in Public Environmental Review

(2008): confusion of turtle hatchling

behaviour when primary wave front cue for

swimming direction competes with light

source offshore, if leaving the beach in the

vicinity of the Materials OffloadingFacility/loading jetty. If hatchlings swim

towards the lights they may remain in the lit

area increasing their risk of predation

Actual shore crossing site is approximately

60 m inland of the high water mark. Turtles

generally nest within the first 50 metres

from high water

27 M ar ine f auna Art if ic ia l l ight C ha nge i n m ov em ent/beha vi our of

seabirds (potential attraction of shore

birds (e.g. shearwaters) to flare)

Maintenance activities at the Gas

Treatment Plant; additional flaring during

commissioning and during non-routine

operation

MEDIUM Additional lighting sources adding to the light glow

load experienced. Additional non-routine flaring

required; additional light due to reflection off

additional infrastructure

5 2 MEDIUM 5 2 MEDIUM Tugs and pilots have had their lighting

design in a specific way. No ability to

regulate open-market vessels

28 M ar ine f auna Art if ic ia l l ight Dis or ient at ion of m ar ine t ur tl e

hatchlings and associated increased

mortality and predation

Installation activities in shallow water as

it approaches Barrow Island North Whites

Beach - artificial lighting from installationvessels

MEDIUM Additional construction activities on the west of


site requiring artificial light sources andnavigational/security/work lighting on marine





29 M ar ine fa una Art if ic ia l li ght H at ch li ngs at trac ted to a rt if ic ia l li ghts

and move towards these rather than

the ocean leading to reduced survival

rates

Gas treatment plant operation;




operation


load experienced. Additional flaring required;

additional light due to reflection off additional

infrastructure




20/49


Page 6




Comments

C L R C L R




Environmental

Factor


Project

Impact

30 Ma ri ne fa un a A rt if ic ia l l ig ht I ncr ea se d p re da ti on o f m ar in e fa un a

attracted to light spill (except marine

turtles which are assessed separately

given sensitivity)

Additional artificial lighting at the Gas

Treatment Plant

LOW Additional lighting sources adding to the light glow



infrastructure

5 3 LOW 5 3 LOW _

31 M ar ine f auna Art if ic ia l l ight I nt er rupt ion t o m ar ine t ur tl e nes ti ng ,

breeding and mating, and

interruption to juvenile foraging

Installation activities in shallow water as

it approaches Barrow Island North Whites

Beach - artificial lighting from installationvessels



site requiring artificial light sources andnavigational/security/work lighting on marine




6 2 LOW 6 2 LOW Fourth Train Proposal not expected to add

to the risks already assessed and approved

for Foundation Project. Impact has beenreduced to ALARP

Fourth Train Proposal Feed Gas Pipeline

System will likely follow a similar route

alongside the Foundation Project's Feed Gas

Pipeline Systems in State Waters

32 M ar ine f auna Art if ic ia l l ight Juv enil e w edge-t ai led s hearwa ters

attracted to the lights of the gas

treatment plant may be injured

through collision with infrastructure





operation

LOW Additional lighting sources adding to the light glow



infrastructure

6 3 LOW 6 2 LOW _

33 M ar ine f auna Art if ic ia l l ight O ut -c om peti ti on of nat iv e s hore

birds/change in community structure

in area affected by light spill - due to

the attraction of non-native seabirds

(e.g. silver gull) - attracted by insectsetc around additional plant lighting





operation




infrastructure

6 4 LOW 6 2 LOW Light spill modelling to determine the extent

to which the Fourth Train Proposal's

operational lighting affects Foundation

Project light spill

34 M ar ine f auna Art if ic ia l l ight R educ ed turt le nest ing by det erri ng

female turtles from emerging onto

the beach. Longer-term shift of

flatback turtle nesting effort to

adjacent beaches

Construction of fourth train at the Gas

Treatment Plant

MEDIUM Additional light sources during construction of

fourth train adding to light glow experienced

4 3 MEDIUM 4 2 MEDIUM Direct light spill onto the beach is not

anticipated

35 M ar ine f auna Art if ic ia l l ight R educ ed turt le nest ing, by deterr ing

females from emerging onto beach

Longer-term shift of flatback turtle

nesting effort to adjacent beaches

Operation of the Materials Offloading

Facility/WAPET Landing during

construction and operation of the Fourth

Train Proposal

Artificial lighting on marine vessels (and

their tugs/pilot vessels) coming to and

from the Materials Offloading

Facility/WAPET Landing

MEDIUM Additional artificial task lighting used for safe

operation of MOF/WAPET and LNG Jetty;

increased frequency of artificial light experienced

from logistic related marine vessels coming to and

from the Port Authority Area

5 3 LOW 5 3 LOW Foundation Project risk took into account

construction works and dredging activities

off East Coa

Documents

g4 Per Deis Appendix f2 Consolidated Env Risk Assessment