Existing wells that are open to the deep aquifer and used to define the plume include:
- monitoring wells installed as part of an investigation at Reilly Tar & Chemical Corp., a different contaminated site in St. Louis Park
- industrial production wells
- golf course irrigation wells
- municipal wells
With sample data from these wells, the Minnesota Pollution Control Agency was able to determine the extent and magnitude of the plume in this drinking water aquifer. The plume is defined by wells where chlorinated volatile organic compound contamination was detected above the Minnesota Department of Health’s drinking water standards.