Illinois Department of Public Health Assessment and Health Consultation in cooperation with the Agency for Toxic Substances and Disease Registry

  • IDPH is a federal agency that reviews information about hazardous substances at waste sites and evaluates whether exposure to these substances might cause human risk.
  • The ATSDR uses existing scientific information, including the results of medical, toxicologic, and epidemiologic studies and the data collected in disease registries to determine the health effects of exposure.
  • The assessment said that the receptor population includes nearby residents, recreational users, and fishers potentially exposed to the past, present, or future contaminants.
  • high levels of pentachlorophenol (PCP) or PAHs from groundwater
  • low levels of arsenic and lead
  • The assessment concluded that the levels of contaminants found meet the benchmark to be considered no risk to humans.
  • Darryl Weber, a retired electrician who lost his mother, Nannie Tisdale, to breast cancer after living near the Koppers plant over a series of years.

Independent genetic study

  • Eva Tidwell and her genetic specialists concluded that the cancer she was diagnosed with was not due to hereditary reasons.
  • Tidwell’s clinical summary documented by Invitae, which offers health consultations about cancer and genetic illness, said there was a negative result for pathogenic sequence variants, deletions, or duplicates identified.
  • According to the National Cancer Institute (NCI), a government agency for cancer research, there was no sign of a pathogenic variant, genetic alteration that increases an individual’s susceptibility to disease in Tidwell’s case.
  • However, this result does not eliminate the possibility that her condition had a genetic component.

Final Human Health Risk Assessment

  • A HHRA is the process to estimate the nature and probability of adverse health effects in humans who may be exposed to chemicals in contaminated environmental media, now or in the future, according to the EPA.  
  • Arcadis Inc. conducted the HHRA in 2015 to assess Potential Human Receptors and Exposure Assumptions, Current/Future On-Site Adult Maintenance Worker/Caretaker, Current/Future On-site Adult Deer Hunter and Adolescent and Child Deer Consumer, Current/Future On-site or Off-Site Adolescent Trespasser, Future On-site or Off-Site Adult and Adolescent Hikers/Bicycle Trail Users, Future On-site Solar Farm Maintenance Worker, Kayaker/Canoeist, Recreational Angler and Child Fish Consumer.