Article: Stormwater-relief project.(Civic Projects)

The Metropolitan St. Louis Sewer District (MSD) has an ongoing program to mitigate flooding in the southern section of the city of St. Louis. A part of the program includes a stormwater-relief tunnel installation. Recently, MSD contracted with Affholder Inc. to construct a 9-foot-diameter horizontal stormwater-relief tunnel approximately 100 feet below grade in South St. Louis, Mo. Included in the scope of work are drop inlet shafts to introduce storm water into the tunnel.

Affholder called upon the expertise of Drilling Service Co. of Bridgeton, Mo., to drill and case 10-foot diameter shafts to the top of bedrock (approx. 50-75 ft. below grade) at seven locations ...

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