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Innovative anti-microbial product for a challenging concrete pipe installation


The Metropolitan St. Louis Sewer District (MSD) faced a problem familiar to many big city wastewater departments managing underground assets. A large (72-inch) sanitary sewer needed to be replaced with an even larger line to handle wet weather flows and eliminate sanitary sewer overflows (SSOs). In the years since initial installation, the above-ground area had become heavily developed. “We’re handling the Coldwater Creek project in three phases,” explains MSD Principal Engineer Greg Tolcou, P.E., “and this phase is the shortest. It is a 2,300 foot stretch that passes (at an average depth of 20-25 feet to flow line) under Lindbergh Boulevard. It also passes under a 20-inch gas line, a 24-inch water main, a condominium complex lake, the parking lot and the improvements for a driving range. The projected cost to restore surface disruptions is getting so high on these kinds of projects that tunneling is becoming more and more cost effective.”


Reprinted with permission: CPI – Concrete Plant International


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