CONTAMINANT-FREE. The PCB-contaminated soil that have been treated using the indirect thermal desorption are stockpiled in this area beside the treatment site. All the treated soil have been tested and met the U.S. Environmental Protection Agency requirement of being below 1 part per million PCB. The U.S. Army Corps of Engineers said they will be used to back fill previous excavation sites. Photo by Haidee V. Eugenio