The project details and some additional photos can be found here.
The remediation involved stabilization with compaction grouting, de-watering, bypass lines (including pumps), a sheet-pile wall to project adjacent property, grouted soldier pile walls for excavation support and struts to brace the excavation sides against each other, special bulkheads for the pipes, and the construction of massive access shafts.
Be sure to check out the PDF version of their Power Point Presentation at the bottom of the project page.