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| Service: | Tunnel final lining alternative proposal 
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| Estimated cost: | Commencement: | January 29, 2001 
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          Completion date: | October 21, 2005 
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| Location: | Los Angeles, CA United States | 
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| Technical data: | Tunnel widening from a 14 ft (4.3 m) to 29 ft (8.8 m) springline diameter section.  | 
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| Geology description: | Hard Rock  | 
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