EXECUTIVE SUMMARY

Three of the top ten most frequently detected contaminants at hazardous waste sites are Dense non-aqueous phase liquids (DNAPL) compounds. Although much progress has been made recently to develop and improve cleanup technologies, prior to 1999 no proven technology for the restoration of DNAPL source zones. A new commercially available technology, the Six-Phase Heating (SPH) Technology, is presently being implemented at a number of sites for the treatment of DNAPL contamination. The SPH technology has successfully remediated DNAPL sites including the full-scale application of the technology that is documented in this case study. Over a six-month remediation program, the SPH technology successfully removed significant DNAPL pools and dropped groundwater concentrations to below the required site clean up levels. Based on the results of the SPH system, the site owner has received a written closure letter for no further action from the Illinois EPA for the site