The area in St. Louis Park closest to the suspected source of contamination has contamination above the bedrock, too. This perchloroethylene/trichloroethylene (PCE/TCE) soil vapor plume resulted in soil and vapor issues in certain properties. Those issues were mitigated by the Minnesota Pollution Control Agency (MPCA) in 2008. In 2015, the MPCA verified the soil vapor intrusion mitigation systems installed in those residential properties were still operating. No vapor intrusion problems were identified.
The shallow plume is only in St. Louis Park and is not migrating.