In the Fall of 1989, during pre-design field investigation, additional contamination in the form of polynuclear aromatic hydrocarbons were discovered in the soil area of the new slip. PAHs resulting from coking and wood treating operations, to OMC's ownership of the property. The discovery of PAHs required a limited investigation in the area of the new slip and resulted in the removal of PAH-contaminated soils above 5 ppm. Physical construction was completed as of February 1992. Operation and maintenance of the site will continue until 1999, per the consent Decree order.
Monitoring indicates that fish tissue contaminant concentrations in the harbor continue to decrease.
Warning signs from within the harbor have been removed because sampling has recently shown declines in concentrations to the same levels as the greater Lake Michigan area. Compliance monitoring continues to show the remedy is meeting its objectives.