SCI is providing geotechnical and laboratory testing services for improvements to the Prairie DuPont Levee. The project includes 158 borings in 10.4 miles of levees protecting over 15 square miles in St. Clair and Monroe counties. Improvements to the levee have been proposed and could include installation of relief wells or seepage berms to mitigate the potential for underseepage. The project area consists of an approximate 540-acre corridor and approximately 100 acres of potential borrow area.

Project Information: Services: Geotechnical Services Laboratory Testing Quality Assurance (QA) Project Size 10.4 miles – levee 158 – soil borings Project Cost $66 million (estimated construction cost)

Geotechnical services include the advancement of geotechnical borings and the performance of laboratory tests in order to characterize the subsurface conditions of the levee system. Results will be presented to USACE personnel for underseepage analysis. Laboratory testing included conducting over 3,000 tests in a six-week period and providing QA samples to the USACE. Services also included agency coordination, QA on laboratory staff and procedures, and reviewing test results.

SCI also prepared an Environmental Assessment (EA). A significant portion of the EA was the preparation of a Phase One submitted to the USACE. This Phase One was performed in general conformance with ASTM 1527-05 standards and included over 350 individual parcels with varying owners. Natural and Cultural Resource services were also provided by SCI for this project.