❓ A WA parliamentary question seeks information on the Northbridge Tunnel's maintenance costs, water leakage issues, and environmental analysis. The response indicates significant maintenance expenditure, no current leakage problems, and ongoing water table monitoring.
AnsweredQoN 2870Legislative Assembly
QuestionView source ↗
In relation to the Northbridge Tunnel roadway and structures, I ask:
(1) what are the annual maintenance costs;
(2) what are the costs associated with leaks and water infiltration into the tunnel; and
(3) what recent environmental and water table analysis has been done on the tunnel environs?
(1) what are the annual maintenance costs;
(2) what are the costs associated with leaks and water infiltration into the tunnel; and
(3) what recent environmental and water table analysis has been done on the tunnel environs?
AnswerView source ↗
Answered
15 June 2010
Responded by
Parliamentary Secretary representing the Minister for Transport
Response time
41 days
(1) Annual contract payments for the operation, repair and maintenance of the Northbridge Tunnel for 2009 were $4.68m (ex GST). The lump sum contract is subject to adjustment in accordance with the rise and fall calculations using published Australian Bureau of Statistics indices.
(2) There are currently no known water leakage problems associated with the Northbridge Tunnel and no specific intervention has been required for several years.
(3) Extensive investigation of the geology, geotechnical characteristics and hydrogeological factors were undertaken during design and construction of the tunnel. The tunnel contractor continually monitors the water table associated with the tunnel, but not the surrounding area. However, if the water table was found to vary significantly, it would be used as a trigger to investigate what is happening in the surrounding areas. To date, water level movement has been minimal.
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(2) There are currently no known water leakage problems associated with the Northbridge Tunnel and no specific intervention has been required for several years.
(3) Extensive investigation of the geology, geotechnical characteristics and hydrogeological factors were undertaken during design and construction of the tunnel. The tunnel contractor continually monitors the water table associated with the tunnel, but not the surrounding area. However, if the water table was found to vary significantly, it would be used as a trigger to investigate what is happening in the surrounding areas. To date, water level movement has been minimal.
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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