❓ A WA parliamentary question on notice regarding the Chevron Gorgon development on Barrow Island, covering concrete usage, population numbers, water usage, and waste disposal. The response provides detailed information on these aspects of the project.
AnsweredQoN 2725Legislative Council
QuestionView source ↗
I refer to the Chevron Gorgon development on Barrow Island, and ask -
(1) Are the proponents filling in porous cast systems under their proposed industrial footprint with concrete?
(2) If yes to (1), -
(a) to what depth are they operating;
(b) how many tonnes of concrete have and will be used in the substrate to form a solid base;
(c) what companies are supplying the aggregate;
(d) from what location is the material coming from to fulfil this process; and
(e) is any other material, waste or waste water being used as fill or as a component of the concrete?
(3) If yes to (1)(e), -
(a) why; and
(b) with who’s permission?
(4) How many tonnes of concrete have been produced so far for the Gorgon development on Barrow Island?
(5) How many tonnes of concrete are to be produced in total for the Gorgon development on Barrow Island?
(6) What is the current maximum population numbers at any one time for Barrow Island by industry?
(7) What is the current number of accommodation units available for worker occupation on Barrow Island by industry?
(8) What is the future maximum population numbers projected at any one time on Barrow Island by industry?
(9) What is the projected maximum number of accommodation units projected for worker occupation on Barrow Island by industry?
(10) How much water is available daily for dust suppression?
(11) Where is the dust suppression water coming from and is the supply sustainable?
(12) What is the PH and saline levels of water being used for dust suppression?
(13) How much potable water is being consumed daily?
(14) Where is potable water coming from and is that source sustainable?
(15) How much water is being used in the ablutions daily?
(16) Where is the ablution water coming from, and is that source sustainable?
(17) What is the PH and saline levels of water being used for ablutions?
(18) How is grey and sewerage water disposed of and at what location?
(19) How much grey and sewerage water by type is disposed of daily?
(20) Are the disposal methods currently and in the future sustainable?
(1) Are the proponents filling in porous cast systems under their proposed industrial footprint with concrete?
(2) If yes to (1), -
(a) to what depth are they operating;
(b) how many tonnes of concrete have and will be used in the substrate to form a solid base;
(c) what companies are supplying the aggregate;
(d) from what location is the material coming from to fulfil this process; and
(e) is any other material, waste or waste water being used as fill or as a component of the concrete?
(3) If yes to (1)(e), -
(a) why; and
(b) with who’s permission?
(4) How many tonnes of concrete have been produced so far for the Gorgon development on Barrow Island?
(5) How many tonnes of concrete are to be produced in total for the Gorgon development on Barrow Island?
(6) What is the current maximum population numbers at any one time for Barrow Island by industry?
(7) What is the current number of accommodation units available for worker occupation on Barrow Island by industry?
(8) What is the future maximum population numbers projected at any one time on Barrow Island by industry?
(9) What is the projected maximum number of accommodation units projected for worker occupation on Barrow Island by industry?
(10) How much water is available daily for dust suppression?
(11) Where is the dust suppression water coming from and is the supply sustainable?
(12) What is the PH and saline levels of water being used for dust suppression?
(13) How much potable water is being consumed daily?
(14) Where is potable water coming from and is that source sustainable?
(15) How much water is being used in the ablutions daily?
(16) Where is the ablution water coming from, and is that source sustainable?
(17) What is the PH and saline levels of water being used for ablutions?
(18) How is grey and sewerage water disposed of and at what location?
(19) How much grey and sewerage water by type is disposed of daily?
(20) Are the disposal methods currently and in the future sustainable?
AnswerView source ↗
Answered
12 October 2010
Responded by
Minister for Environment
Response time
35 days
(1) No.
(2)-(3) Not applicable.
(4) Approximately 5,000 tonnes.
(5) Approximately 500,000 tonnes of concrete to be produced on Barrow Island with another 200,000 tonnes (approximately) of precast concrete units to be delivered to the island.
(6) Approximately 1,250 people, including the Gorgon project and WA Oil.
(7) Approximately 1,330 beds, including the Gorgon project and WA Oil.
(8)-(9) Peak construction is anticipated in 2012. I am advised that the proponent is currently reviewing expected workforce numbers.
(10) Approximately 1,000 m3 per day is currently available.
(11) Water for dust suppression is currently sourced from a reverse osmosis plant on Barrow Island, potable quality water barged from the mainland, and seawater from the ocean. The use of seawater for dust suppression is limited to specific areas of the LNG plant site in accordance with the project environmental approval and approval by the Office of the Environmental Protection Authority.
(12) Water from the reverse osmosis plant is potable quality, with pH ranging from 6 to 8. The seawater is untreated, with a pH of approximately 7.8.
(13) Approximately 1,500 m3.
(14) Potable water is coming from a reverse osmosis plant on Barrow Island using seawater as supply, and by barge from the mainland. I have been advised by DEC that both of these supplies are considered to be sustainable.
(15) Approximately 350 m3.
(16) Water for ablutions is supplied by a reverse osmosis plant on Barrow Island. I have been advised by DEC that this source is considered to be sustainable.
(17) See the answer to (12).
(18) Generally, grey water and sewage from the Gorgon project is treated in a waste water treatment plant. Treated effluent is then injected under pressure via deep wells into the Flacourt geological formation, which is more than 1000m below the ground and is geologically isolated from shallower surface water formations and the water table.
The one exception to this is the grey and sewage water from the existing WA Oil Camp where accommodation facilities are shared by WA Oil and Gorgon. Due to the impracticalities of separating WA Oil waste from Gorgon waste, grey and sewage water from this facility will continue to be treated in a waste water treatment plant before being discharged to an existing approved ocean outfall.
(19) Approximately 350m3.
(20) Yes. The OEPA has advised that these bores have a sufficient capacity to inject approximately 13,000 m3/day. During construction, injection of treated effluent is not expected to exceed 1,500 m3/day.
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(2)-(3) Not applicable.
(4) Approximately 5,000 tonnes.
(5) Approximately 500,000 tonnes of concrete to be produced on Barrow Island with another 200,000 tonnes (approximately) of precast concrete units to be delivered to the island.
(6) Approximately 1,250 people, including the Gorgon project and WA Oil.
(7) Approximately 1,330 beds, including the Gorgon project and WA Oil.
(8)-(9) Peak construction is anticipated in 2012. I am advised that the proponent is currently reviewing expected workforce numbers.
(10) Approximately 1,000 m3 per day is currently available.
(11) Water for dust suppression is currently sourced from a reverse osmosis plant on Barrow Island, potable quality water barged from the mainland, and seawater from the ocean. The use of seawater for dust suppression is limited to specific areas of the LNG plant site in accordance with the project environmental approval and approval by the Office of the Environmental Protection Authority.
(12) Water from the reverse osmosis plant is potable quality, with pH ranging from 6 to 8. The seawater is untreated, with a pH of approximately 7.8.
(13) Approximately 1,500 m3.
(14) Potable water is coming from a reverse osmosis plant on Barrow Island using seawater as supply, and by barge from the mainland. I have been advised by DEC that both of these supplies are considered to be sustainable.
(15) Approximately 350 m3.
(16) Water for ablutions is supplied by a reverse osmosis plant on Barrow Island. I have been advised by DEC that this source is considered to be sustainable.
(17) See the answer to (12).
(18) Generally, grey water and sewage from the Gorgon project is treated in a waste water treatment plant. Treated effluent is then injected under pressure via deep wells into the Flacourt geological formation, which is more than 1000m below the ground and is geologically isolated from shallower surface water formations and the water table.
The one exception to this is the grey and sewage water from the existing WA Oil Camp where accommodation facilities are shared by WA Oil and Gorgon. Due to the impracticalities of separating WA Oil waste from Gorgon waste, grey and sewage water from this facility will continue to be treated in a waste water treatment plant before being discharged to an existing approved ocean outfall.
(19) Approximately 350m3.
(20) Yes. The OEPA has advised that these bores have a sufficient capacity to inject approximately 13,000 m3/day. During construction, injection of treated effluent is not expected to exceed 1,500 m3/day.
Notice: This document is created or edited using unregistered or evaluation copy of rtLib valid for testing or development purposes only. To use it for productive or any other purposes please register it. You may purchase the license on
http://www.rtlib.com
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