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St. Louis, MO


The Maline Creek CSO project is part of MSD Project Clear, which is a long-term
effort by MSD, undertaken as part of an agreement with the U.S. Environmental
Protection Agency and the Missouri Coalition for the Environment. Project Clear is
an initiative to improve water quality and alleviate many wastewater concerns
throughout St. Louis City and County.
Maline Creek is a small tributary to the Mississippi River that leis on the northern
edge of the City of St. Louis. The Maline Creek facility is the second MSD Project
Clear storage project to be constructed. The underground storage facility will
reduce the volume of discharge into Maline Creek and, ultimately, the Mississippi
River. The Maline Creek storage facility will run from the Chain of Rocks Drive to
Church Road. In this project, there are two locations, just upstream of the
confluence of the Mississippi River, where combined sewers may discharge into
Maline Creek during significant wet weather. This project will divert the excess
water and sewage to the Maline Creek Storage Facility during times of significant
wet weather, and then a pump station will transfer the stored flow back to the
system when the wet weather subsides. The flow will be treated at the Bissell
Point Wastewater Treatment Plant.
The work built on this project consists of construction of a 40 foot diameter, 12.5
MGD submersible pump station that is 165 feet underground. SAK is to complete
the excavation of 2,700 lf tunnel to a diameter of 33 feet with a finished diameter
of 28 feet with a cast in place concrete lining. SAK’s scope of work includes a 580
foot long by 6 foot connecting tunnel with Hobas pipe; three deaeration
chambers; three intake structures, a shallow connector sewer constructed by
pipe jacking and 1,000 feet of 12-inch to 30-inch diameter near-surface sewers.

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