The title of this study doesn’t say it all. But it says enough to make any thoughtful person want to take a look, and see what’s what:
“Too Much Excitement under Highway 87,” D.E. Hook, R.L. Volpe, and C. Chamness, in Pipelines 2006: Service to the Owner, 2006, pp. 1-9. The authors begin their summing up with this thought:
“Major lessons learned from this surprising adventure included: 1. Ensure that the appropriate professionals (geotechnical engineer or record in this case) are involved throughout design and construction rather than only during initial investigation….”