Building Stronger Communities: Upper Mattese Trunk Sanitary Relief

What has been one of your favorite projects to work on while at CDI?

I worked on a variety of projects including sanitary sewer design, wastewater treatment plant design, and hydraulic modeling. My favorite project is Upper Mattese Trunk Sanitary Relief. The project is in the Mattese Creek Watershed in an area west of Interstate 55 and east of Sappington Road and crosses Interstate 270 in the City of Sunset Hills and unincorporated St. Louis County. The project consists of upsizing approximately 15,000 linear feet of the existing trunk sanitary sewer to meet the desired Level of Service by the Metropolitan St. Louis Sewer District (MSD). CDI’s scope includes a survey of the entire project, design for approximately 4,800 linear feet of sewer upstream, and hydraulic modeling.

How did CDI Build Stronger Communities through this project?

The project is in a heavily residential area with Mattese Creek meandering through the community. Between 2004 and 2017, there have been 27 water backup complaints at 22 properties due to overcharged mains and backed mains recorded. Additionally, we observed creek bank erosions at various locations throughout the project area. By designing the new sewer system, CDI will help the Metropolitan St. Louis Sewer District (MSD) provide an adequate level of service to the community. CDI’s expertise in sanitary sewer design and hydraulic modeling will prevent the community from experiencing basement backups during storm events that may cause property damages and unpleasant disturbances to their day-to-day life. Lastly, the construction of the new sewer will help stabilize creek banks which will maintain the entirety of the usable land for property owners.

Author: Jiaman Xu, 6 Years at CDI

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