PROJECT PROFILE D’Appolonia had lead responsibility for geotechnical aspects related to con- struction of the Downstream Cofferdam for the Kentucky Lock Addition pro- ject. The site was characterized by un- usually hard and abrasive limestone (average unconfined strength = 28,000 psi) that had a highly irregular surface profile due to variable weathering and major solution features. The bedrock posed significant excavation and seep- a

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