 An 8 @-@ acre ( 3 @.@ 2 ha ) industrial area in Castanea Township adjacent to Lock Haven was placed on the National Priorities List of uncontrolled hazardous waste sites ( commonly referred to as <unk> sites ) in 1982 . Drake Chemical , which went bankrupt in 1981 , made ingredients for <unk> and other compounds at the site from the 1960s to 1981 . Starting in 1982 , the United States Environmental Protection Agency began a clean @-@ up of contaminated containers , buildings , and soils at the site and by the late 1990s had replaced the soils . Equipment to treat contaminated groundwater at the site was installed in 2000 and continues to operate . 
