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Allegheny County Sanitary Authority
Work includes launch and retrieval shafts, and access shafts for construction; ort - main tunnel, 18' finished dia (segmental lining), approx. 20,000 LF long, 120 to 150 feet below ground surface; creek tunnel - river crossing, 14' finished dia approx 4,500 long; run tunnel - river crossing, 14' finished diameter, approx 1,600 LF long.
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Colorado Springs Utilities
Homestake tunnel inspection.
Iowa Department of Administrative Services
Work includes replacement of the parking lot & tunnel cap, implementation of a sump pump system, replacement of utility lines, repairing the structural integrity of the tunnel walls and relocation of tunnel access hatches. See attached file.
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May 28, 2025
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Nov 24, 2025