Indiana Department of Environmental Management, Office of Land Quality personnel have compiled information on the impacts of contamination to riverine sediments in the Calumet waterways from the report referred to as the "Sediment Injury Report" by the U.S. Fish and Wildlife Service:
The following is excerpted and modified from the Sediment Injury Report (USFWS, 2000):
A quasi-three-dimensional (3-D) bathymetric model of the Calumet Waterways assessment area located in northern Lake County, Indiana, has been developed by personnel at the Indiana Department of Environmental Management (IDEM). In addition, a continuous raster data layer has also been developed to show the spatial distribution of mean Probable Effect Concentration-Quotient (PEC-Q) values for polycyclic aromatic hydrocarbons (PAH) in surficial sediments in the assessment area. The PEC-Q values are used to measure the amount of impact to waterways by contaminated sediments. The maps show the spatial distribution of contamination levels found in the surficial sediments of the waterway.
The sediments layer was derived from a database that compiles of data from 49 sediment characterization studies. The sediment characterization studies date from 1972 through 2005, and were contracted by many different local, state, and federal agencies. The data was compiled to support "An Assessment of Sediment Injury in the Grand Calumet, Indiana Harbor Canal, Indiana Harbor, and the Near Shore Areas of Lake Michigan" (US Fish and Wildlife Service, 2000). The assessment is an evaluation of the harmful effects of sediment-associated contaminants in the Calumet waterways. The results of this evaluation demonstrate that sediments throughout the waterways have been injured due to discharges of oil or releases of other hazardous substances.
Bathymetric data were provided by Tetra Tech LLC and the US Army Corps of Engineers, Chicago District. The sediment injury (PEC-Q) data for PAHs in surficial sediments were derived from USFWS (2000). The bathymetric elevation model and continuous PEC-Q data were compiled and processed by personnel of the Indiana Department of Environmental Management (IDEM).
Info to know
Remediation efforts are underway in many areas of the LakeRim region in northwestern Indiana.