Still Going Strong 17 Years Later: Successful Sewer Structure Rehabilitation
Ron Moore, PMP
In the year 2000 one of the Metropolitan St. Louis Sewer District’s major sewer structures, the Maline Drop Shaft, had been so severely degraded by microbiologically induced corrosion (MIC) that structural failure was a very real possibility. This would have been a disaster for all the obvious reasons, not least the proximity of the Mississippi River and St. Louis’ famous Chain of Rocks Bridge. But at the time, there was no obvious way to rehabilitate the drop shaft that would restore it structurally and also prevent future MIC damage. Even replacement of the Maline Drop Shaft—which would have cost $3-4 million—would not necessarily have eliminated MIC.