US EPA Releases Remedial Investigation Report for St. Louis

The Remedial Investigation report for Operable Unit 3, or OU3, and portions of OU4 is complete. The Remedial Investigation evaluates the nature and extent of contamination along with determining the risk to human and wildlife. OU3 extends approximately 1.5 miles downstream from the St. Louis, Michigan dam. It includes sediment, riverbanks and four floodplains within the Pine River. The OU4 Remedial Investigation is ongoing and is located from the boundary of OU3 to the Chippewa River. EPA has determined that an unacceptable level of contamination is present in OU3 in riverbanks and floodplains. EPA is currently evaluating OU3 cleanup alternatives to address this unacceptable risk, mainly to wildlife. The alternatives are evaluated in a document called a Feasibility Study. This document should be available in early February. EPA will issue its proposed cleanup plan for public comment in late spring or early summer.

A full copy of the Remedial Investigation report can be found at the T.A. Cutler Memorial Library, 312 Michigan Ave., St. Louis, MI 48880 or by following the link [REDACTED] CH2M HILL - FINAL REMEDIAL INVESTIGATION REPORT (epa.gov) (NOTE: this is a very large file and may take some time to open).