Sure Jodi, They worked at Matthiessen and Hegeler Zinc Company in LaSalle... It's now a Superfund site... If you'd like the webpage that states this, it's : _http://www.epa.gov/fedrgstr/EPA-PEST/2003/September/Day-29/p24406.htm_ (http://www.epa.gov/fedrgstr/EPA-PEST/2003/September/Day-29/p24406.htm) Go about two thirds down the page and it's listed as third on the National Priorities list. Les