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| Service: | Detailed design including tender documentation
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| Estimated cost: | Commencement: | May 28, 1991
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Completion date: | October 19, 1992
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| Location: | Wiesbaden, Hesse Germany |
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| Technical data: | City sewage system: NATM tunnel under compressed air, construction of new scheme located 1 m below operating old brick lined sewage pipe. |
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| Geology description: | Tertiary clay, gravel and mud, (ground water table above tunnel roof). |
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| Bid cost: | Final cost: | $1,500,000
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City sewage system: NATM tunnel under compressed air (0.25 bar), construction of new scheme located 1m below operating old brick lined sewage pipe. Steel plate lining is closed to the face (2 m behind) to reduce air pressure losses.