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ENR > Transportation > High Water Pressure Complicates Arrowhead Tunnels, Second work plan relies on new TBMS, aggressive grouting
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| Description |
| Stymied once by tremendous groundwater pressures and difficult geology, tunnelers in southern California are trying again to push two critical links to completion in a $1.2-billion project that will provide water for fast-growing and increasingly thirsty cities and towns spreading east from Los Angeles. Two years into their second attempt, Metropolitan ...
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