g4 Per Deis Appendix f1 Risk Assessment Consequence Criteria

8/18/2019 g4 Per Deis Appendix f1 Risk Assessment Consequence Criteria

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Gorgon Gas Development Fourth Train Expansion Proposal App F

Revision: 0 Public © Chevron Australia Pty Ltd

Revision Date: June 2014 Document #: G4-NT-REPX0000116

Appendix F: Environmental Risk Assessment


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Gorgon Gas Development Fourth Train Expansion Proposal App F1



Appendix F1: Risk Assessment Consequence Criteria


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App F1 Appendices

© Chevron Australia Pty Ltd Public Revision: 0

Document #: G4-NT-REPX0000116 Revision Date: June 2014

Risk Assessment Consequence Criteria

Environmental and

Social Factors

6

INCIDENTAL

5

MINOR

4

MODERATE

3

MAJOR

2

SEVERE

1

CATASTROPHIC

Terrestrial Environment

Soil and Landform[1]

Degradation and

Contamination

Localised and short-term soil

contamination or degradation

of soil integrity or specific soil

characteristic(s).

Degradation and

Contamination

Localised and long-term or

widespread and short-term

soil contamination or

degradation/loss of soil

integrity or specific soil

characteristic(s).

Degradation and

Contamination

Localised and irreversible

or widespread long-term




characteristic(s).

Degradation and

Contamination

Significant, widespread,

and persistent soil

contamination or



characteristic(s).

Degradation and

Contamination

Significant and persistent


degradation of soil

integrity or loss of specific

soil characteristic(s)

across the whole of

Barrow Island.

Degradation and

Contamination


and persistent soil

contamination or

degradation of soil

integrity/loss of specific

soil characteristic(s) on a

regional scale (i.e. Barrow

Island, Lowendal and

Montebello Islands

and/or the Pilbara

Region).

Recharge Patterns

Localised and short-term

disturbance to recharge

patterns that can be readily

remediated.

Recharge Patterns



disturbance to recharge

patterns.

Recharge Patterns


disturbance to surface/

groundwater recharge

patterns.

Recharge Patterns


and persistent

disturbance to surface/


patterns.

Recharge Patterns


change in surface/


patterns across the whole

of Barrow Island.

Recharge Patterns


and persistent change in

recharge patterns on a



Montebello Islandsand/or the Pilbara

Region).

Landforms and Habitat


disturbance to well-

represented landforms that

can be readily remediated.




disturbance to well-

represented landforms.


disturbance to a sensitive

habitat.



or widespread long-term

loss of well-represented

landform habitats.

Localised and long-term

disturbance to a sensitive

habitat.



and persistent changes to

well-represented

landform habitats, or

widespread, long-term

disturbance to sensitive

habitats.



losses of well-represented

or unique/ sensitive

landform habitats across

the whole of Barrow

Island.



and persistent loss of

well-represented and

unique landform habitats

on a regional scale (i.e.

Barrow Island, Lowendal

and Montebello Islands

and/or the Pilbara

Region)


4/11




Environmental and

Social Factors

6

INCIDENTAL

5

MINOR

4

MODERATE

3

MAJOR

2

SEVERE

1

CATASTROPHIC

Surface and Groundwater

Quality


Quality


reduction in surface and

groundwater quality that can

be readily remediated.


Quality

Localised, but long-term


groundwater quality.

Widespread short-term


groundwater quality that can

be remediated.


Quality




Widespread long-term


groundwater quality,

requiring significant

remediation efforts.


Quality


and persistent reduction

in surface and



Quality



groundwater quality

across the whole of

Barrow Island.

Surface and

Groundwater Quality


and persistent reduction

in surface and

groundwater quality on a



Montebello Islands

and/or the Pilbara

Region).

Air Quality Air Quality Standards[2]

Localised, short-term, and

minor exceedance of air quality

standards.

Air Quality Standards[2]

Minor, localised, and long-

term or minor widespread,

short-term exceedance of air

quality standards.

Major, localised, and short-

term exceedance of air quality

standards.


Minor, widespread, and

long-term exceedance of

air quality standards.

Major, widespread, and

short-term exceedance of

air quality standards.



and long-term

exceedance of air quality

standards, resulting in

minor, but persistent

reduction in air quality

across multiple locations

on Barrow Island.



reduction in air quality

standards across the

whole of Barrow Island.



reduction in air quality on

a regional scale (i.e.



and/or the Pilbara

Region).

Restricted Flora and

Vegetation Associations

Abundance and Structure


decrease in abundance or

impact on vegetation

association structure.

Sublethal physiological

impacts.









or widespread and long-

term decrease in

abundance or impact on

vegetation association

structure.



and persistent decrease in

abundance of flora or




Loss of a significant

portion of the entire

taxon on Barrow Island or

significant and persistent

disruption to vegetation

association abundance

and structure.


Extinction on Barrow

Island, and/or significant

and persistent decrease

in abundance of flora or

loss of effective


structure on a regional

scale (i.e. Barrow Island,

Lowendal and Montebello

Islands and/or the Pilbara

Region).

Viability


reduction in taxon or

vegetation association viability.

Viability



reduction of taxon or


viability.

Viability



term reduction of viability

of taxon or vegetation

association on Barrow

Island.

Viability

Significantly reduced

viability of taxon or



on Barrow Island.

Viability

Near extinction of taxon

or vegetation association

on Barrow Island.

Viability


Island, and/or

significantly reduced

viability (near extinction)




and/or the Pilbara

Region).


5/11

App F1 Appendices



Environmental and

Social Factors

6

INCIDENTAL

5

MINOR

4

MODERATE

3

MAJOR

2

SEVERE

1

CATASTROPHIC

General Flora and

Vegetation Associations






Sublethal physiological

impacts.


Widespread and short-term or

localised and long-term




Sublethal to lethal

physiological impacts.


Widespread and long-

term decrease in



structure.






structure.


Extinction of taxon on

Barrow Island or

significant and persistent

disruption to vegetation

association and structure.


Extinction of taxon or

vegetation association or

loss of effective


structure on a regional




Region).

Viability



vegetation association viability.

Viability





viability.

Viability


reduction in viability or

widespread and long-

term reduction of viability


association.

Viability


reduction in viability of

taxon or vegetation

association across

multiple locations on

Barrow Island.

Viability

Extinction of the entire

taxon or vegetation

association on Barrow

Island.

Viability

Extinction/near extinction


association on a regional




Region).

Listed Fauna, including

Listed Subterranean

Fauna (listed and

threatened species)

Behaviour

Short-term behavioural impact

to protected fauna within local

area.

Behaviour

Long-term behavioural impact

to protected fauna within local

area or widespread short-term

behavioural impact to

protected fauna.

Behaviour


term behavioural impact

to fauna.

Behaviour


change in fauna

behaviour across multiple

locations on Barrow

Island.

Behaviour


change in fauna

behaviour across the


Behaviour


change in fauna

behaviour on a regional




Region).

Abundance


decrease in abundance.

Abundance


widespread, and short-term


Abundance



term decrease in

abundance.

Abundance



abundance.

Abundance

Permanent loss of a

significant portion of the

entire population on

Barrow Island (near

extinction).

Abundance


Island, and/or significant

reduction in abundance




and/or the Pilbara

Region).

Population Viability


reduction of local population,

no lasting effects on the whole

population.




reduction in population

viability.



reduction in viability of

population or widespread

and long-term reduction

of viability on Barrow



population viability across


Barrow Island.


Near extinction of taxon

on Barrow Island.



Island, and/or


viability on a regional



6/11




Environmental and

Social Factors

6

INCIDENTAL

5

MINOR

4

MODERATE

3

MAJOR

2

SEVERE

1

CATASTROPHIC

Island. Lowendal and Montebello


Region).

General Fauna, including

General Subterranean

Fauna (not listed/

threatened species)

Behaviour

Short-term behavioural impact

to fauna within local area.

Behaviour

Long-term behavioural impact

to fauna within local area or


behavioural impact.

Behaviour


term behavioural impact

to fauna.

Behaviour


change in fauna


locations on Barrow

Island.

Behaviour


change in fauna

behaviour across the


Behaviour


change in fauna





Region).

Abundance



Abundance




Abundance



term decrease in

population abundance.

Abundance


changes in population

abundance across


Barrow Island.

Abundance

Permanent loss of the

entire population on

Barrow Island (extinction).

Abundance


Island, and significant and

permanent reduction in

abundance on a regional




Region).



reduction of population

viability, no lasting effects on

the whole population.



widespread short-term


viability.




term reduction of

population viability.



population viability across


Barrow Island.


Extinction of

taxon/population on

Barrow Island.


Extinction or near

extinction on a regional




Region).

Marine Environment

Marine Water Quality Marine Water Quality

Localised and short-term and

minor reduction in water

quality.

Marine Water Quality

Minor reduction in water

quality, which is widespread

and short-term or localised

and long-term.

Significant, localised, and

short-term reduction in water

quality.


Minor and long-term

reduction in water quality

across multiple locations,

but outside marine

conservation reserves[3]

around Barrow Island.





around Barrow Island,

including marine


,

but outside marine

parks[3]

.





around Barrow Island

including marine


and marine parks[3]

.


Significant, persistent and

widespread reduction in

water quality on a



Montebello Islands

and/or the Pilbara

Region).


7/11

App F1 Appendices



Environmental and

Social Factors

6

INCIDENTAL

5

MINOR

4

MODERATE

3

MAJOR

2

SEVERE

1

CATASTROPHIC

Foreshore and Seabed

(subtidal and intertidal)

Seabed/Sediment

Contamination

Localised contamination of low

toxicity, or disturbance that

can readily be remediated.

Seabed/Sediment

Contamination

Localised contamination or

disturbance requiring long-

term remediation efforts.

Widespread contamination or

disturbance that can be

readily remediated.

Seabed/Sediment

Contamination



term contamination or

disturbance outside

marine conservation

reserves[3]

around Barrow

Island.

Seabed/Sediment

Contamination


contamination or

disturbance across

multiple locations around

Barrow Island, including

marine conservation

reserves[3]

, but outside

marine parks[3]

.

Seabed/Sediment

Contamination


contamination or

disturbance across


Barrow Island including

marine conservation

reserves[3]

and marine

parks[3]

.

Seabed/Sediment

Contamination

Significant, persistent,

and widespread

contamination or

disturbance on a regional




Region).

Benthic Substrate


impact on benthic substrate

characteristics.

Benthic Substrate



changes in benthic substrate

characteristics.

Benthic Substrate



term changes in benthic

substrate characteristics

outside marine



Benthic Substrate


change in benthic



around Barrow Island,

including marine


,

but outside marine

parks[3]

.

Benthic Substrate


change in benthic




including marine


and marine parks[3]

.

Benthic Substrate


and persistent change in

benthic substrate

characteristics on a



Montebello Islands

and/or the Pilbara

Region).

Restricted and Significant

Benthic Primary Producer

Communities

Abundance



impact on communities and

habitats.

Abundance




impact on communities

and/or habitats.

Abundance


term or localised and

irreversible decrease in


communities outside

marine conservation

reserves[3]

around Barrow

Island.

Abundance



impact on a communities

and/or habitats around


marine conservation

reserves[3]

, but outside

marine parks[3]

.

Abundance


decrease in abundance of

communities/ habitats



including marine


and marine parks[3]

.

Abundance



of communities/ habitats




and/or the Pilbara

Region).

Viability


reduction in community/ taxon

viability.

Viability



reduction in community/

taxon viability.

Viability


or widespread, long-term

reduction of community/

taxon viability outside

marine conservation

reserves[3]

around Barrow

Island.

Viability



taxon viability around


marine conservation

reserves[3]

, but outside

marine parks[3]

.

Viability

Significantly and

permanently reduced

viability of taxon or

community (near

extinction) around Barrow

Island including marine


and marine parks[3]

.

Viability

Extinction of communities

and habitats around

Barrow Island and


viability on a regional



Islands or the Pilbara

Region).


8/11




Environmental and

Social Factors

6

INCIDENTAL

5

MINOR

4

MODERATE

3

MAJOR

2

SEVERE

1

CATASTROPHIC

General Taxa and

Communities (Flora)

Abundance



impact on communities and/or

habitats.

Abundance





and/or habitats.

Abundance



term decrease in


communities outside

marine conservation

reserves[3]

around Barrow

Island.

Abundance




and/or habitats around


marine conservation

reserves[3]

, but outside

marine parks[3]

.

Abundance


decrease in abundance of

communities/ habitats



including marine


and marine parks[3]

.

Abundance



of communities/ habitats




and/or the Pilbara

Region).

Viability Localised and short-term

reduction in community/ taxon

viability.

Viability Localised and long-term or



taxon viability.

Viability Localised and irreversible


term reduction of

community/ taxon

viability outside marine



Viability Significant and persistent


taxon viability in multiple

locations around Barrow

Island, including marine


,

but outside marine

parks[3]

.

Viability Extinction on Barrow


conservation reserves [3]

and marine parks [3]

.

Viability Extinction or near





Region).

Listed Species or

Evolutionary Significant

Units

Behaviour


behavioural impact.

Behaviour



behavioural impact.

Behaviour


term behavioural impact.

Behaviour


change in species

behaviour in multiple




,

but outside marine

parks[3]

.

Behaviour


change in species






.

Behaviour


change in species





Region).

Abundance



Abundance




Abundance



term decrease in species

abundance outside

marine conservation

reserves [3]

around Barrow

Island.

Abundance


decrease in species

abundance in multiple




,

but outside marine

parks[3]

.

Abundance


reduction in species

abundance across



marine conservation

reserves [3]

and marine

parks [3]

.

Abundance


reduction in species

abundance on a regional




Region).


9/11

App F1 Appendices



Environmental and

Social Factors

6

INCIDENTAL

5

MINOR

4

MODERATE

3

MAJOR

2

SEVERE

1

CATASTROPHIC




viability.





viability.




term reduction of

population viability

outside marine






viability in multiple




,

but outside marine

parks[3]

.


Significantly and

permanently reduced

population viability (near

extinction) across



marine conservation

reserves [3]

and marine

parks [3]

.


Extinction of population


and/or significantly

reduced viability on a



Montebello Islands

and/or the Pilbara

Region).

General Species and

Communities (not listed/

threatened) (Fauna)

Behaviour


behavioural impact.

Behaviour



behavioural impact.

Behaviour


term behavioural impact.

Behaviour


change in species

behaviour in multiple




,

but outside marine

parks[3]

.

Behaviour


change in species






.

Behaviour


change in species





Region).

Abundance



Abundance




Abundance



term decrease in species

abundance outside

marine conservation

reserves [3]

around Barrow

Island.

Abundance


decrease in species

abundance in multiple




,

but outside marine

parks[3]

.

Abundance


loss of species abundance

across Barrow Island

including marine



.

Abundance


loss of species abundance




and/or the Pilbara

Region).




viability.





viability.




term reduction of

population viability

outside marine






viability in multiple




,

but outside marine

parks[3]

.



Island and/or significantly

reduced viability (near

extinction) on a regional




Region).


Extinction or near





Region).


10/11




Environmental and

Social Factors

6

INCIDENTAL

5

MINOR

4

MODERATE

3

MAJOR

2

SEVERE

1

CATASTROPHIC

Social, Cultural and Economic Factors

Workforce and Public

Health and Safety

No measureable impacts on

workforce and/or public health

and safety

Low -level, short-term

inconvenience or symptoms.

No measurable physical

effects. No medical

treatment.

Objective but reversible.

Disability/impairment

and/or medical treatment

injuries requiring

hospitalisation.

Moderate irreversible

disability or impairment

(30%) to one

or more persons.

Short- or long-term

health effects leading to

multiple fatalities or

significant irreversible

human health effects.

Social or Economic

Impacts

No measureable socio-

economic impacts

Local, small-scale, easily

reversible change on local and

regional economy social and

economic characteristics,

infrastructure and/or values of

Shires of Roebourne and

Ashburton or Barrow Island.

Community can easily adapt or

cope with change.

Short-term, recoverable,

or positive changes to

social and economic

characteristics,

infrastructure, and/or

values of the Pilbara

Region or Barrow Island.

Community has significant

capacity to adapt and

cope with or promote

change.

Medium-term,

recoverable, or positive

changes to social and



values of the Pilbara


Community has some

capacity to adapt and


change.

Long-term, but

recoverable or positive

changes to social and



values of Western

Australia, the Pilbara


Limited capacity within

community to adapt and


change.

Irreversible change to

social and economic

characteristics,


values of Western

Australia, the Pilbara


No capacity of community

to adapt and cope with

change.

[1] Landform habitats on Barrow Island could include any of the following: creeks or dry creek beds, rocky outcrops, vegetated sand dunes, tidal flats, valleys, e scarpments, and exposed

limestone ridges, etc.

[2] Air Quality Standards refer to the Ambient Air Quality Standards for common atmospheric pollutants (i.e. nitrogen dioxide, photochemical oxidants, sulfur dioxide and particulate matter) as

listed in the Ambient Air Quality National Environmental Protection Measure (National Environment Protection Council 2003) and the National Occupational Health and Safety Commission’s

Exposure Standards for Atmospheric Contaminants (i.e. benzene, toluene, ethyl benzene, xylenes, and hydrogen sulfide) in the Occupational Environment and the National Exposure Standards

(as amended by Safe Work Australia 1995), and supplemented by criteria adopted by the New South Wales (NSW) Department of Environment and Conservation (DEC)'s Approved Methods for

Modelling and Assessment of Air Pollutants in New South Wales (NSW DEC 2005).

[3] Marine Conservation Reserves are defined in the WA DEC Management Plan for the Montebello/Barrow Islands Marine Conservation Reserves (DEC 2007) as inclusive of the following:

• The Barrow Island Marine Park and the Montebello Islands Marine Park (highest conservation status)

• Barrow Island Marine Management Area (high conservation status) north and south of Barrow Island and to the limit of the state coastal waters to the west, the Lowendal Nature

Reserve to the north of Barrow Island, and the Bandicoot Bay Conservation Area (for benthic primary producer habitat) on the south end of Barrow Island.


11/11

App F1 Appendices



References

Department of Environment and Conservation. 2007. Management Plan for the Montebello/Barrow Islands Marine

Conservation Reserves 2007–2017. Adopted by the Marine Parks and Reserves Authority; Marine

Management Plan No. 55. Department of Environment and Conservation, Perth, Western Australia.

National Environment Protection Council. 2003. Variation to the National Environment Protection (Ambient AirQuality) Measure. National Environment Protection Council, Canberra, Australian Capital Territory.

New South Wales Department of Environment and Conservation. 2005. Approved Method for the Modelling and

Assessment of Air Pollutants in New South Wales. Department of Environment and Conservation,

Sydney, New South Wales.

Safe Work Australia. 1995. Adopted Exposure Standards for Atmospheric Contaminants in the Occupational

Environment [NOHSC:1003(1995)]. Department of Education, Employment and Workplace Relations,

Office of Safe Work Australia, Canberra, Australian Capital Territory.

g4 Per Deis Appendix f1 Risk Assessment Consequence Criteria

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