9 7 9 , ▁E PA ▁susp ended ▁registration ▁for ▁all ▁D BC P - cont aining ▁products ▁except ▁for ▁use ▁on ▁p ine app les ▁in ▁Hawai i . ▁In ▁ 1 9 8 5 , ▁E PA ▁issued ▁an ▁intent ▁to ▁cancel ▁all ▁registr ations ▁for ▁D BC P , ▁including ▁use ▁on ▁p ine app les . ▁Sub sequently , ▁the ▁use ▁of ▁existing ▁stock s ▁of ▁D BC P ▁was ▁prohib ited . ▁ ▁D BC P ▁is ▁used ▁as ▁an ▁intermediate ▁in ▁the ▁synth esis ▁of ▁organ ic ▁chemical s . ▁ ▁S ources ▁and ▁potential ▁expos ure ▁▁ ▁Human ▁expos ure ▁to ▁D BC P ▁could ▁result ▁from ▁the ▁ing estion ▁of ▁cont amin ated ▁drink ing ▁water ▁and ▁food . ▁ ▁Human ▁expos ure ▁could ▁also ▁result ▁from ▁in hal ation ▁and ▁/ ▁or ▁skin ▁contact ▁with ▁the ▁product . ▁ ▁In ▁the ▁past , ▁release ▁of ▁D BC P ▁to ▁the ▁environment ▁occurred ▁primarily ▁from ▁its ▁f um ig ant ▁and ▁nem ato cide ▁uses ; ▁because ▁of ▁the ▁can cellation ▁of ▁all ▁D BC P ▁uses , ▁environmental ▁expos ure ▁is ▁expected ▁to ▁decl ine ▁with ▁time . ▁ ▁Ex amples ▁of ▁pers istence ▁ ▁D BC P ▁resid ues ▁have ▁pers isted ▁in ▁cont amin ated ▁soil ▁and ▁ground water ▁long ▁after ▁applications ▁have ▁ceased . ▁For ▁example , ▁in ▁agricult ural ▁areas ▁around ▁Tur lock ▁in ▁the ▁Central ▁Valley ▁of ▁California , ▁D BC P ▁was ▁applied ▁to ▁cro ps ▁in ▁the